# SPDX-License-Identifier: GPL-2.0
-cec-objs := cec-core.o cec-adap.o cec-api.o
-
-ifeq ($(CONFIG_CEC_NOTIFIER),y)
- cec-objs += cec-notifier.o
-endif
-
-ifeq ($(CONFIG_CEC_PIN),y)
- cec-objs += cec-pin.o
-endif
-
-ifeq ($(CONFIG_CEC_PIN_ERROR_INJ),y)
- cec-objs += cec-pin-error-inj.o
-endif
-
-obj-$(CONFIG_CEC_CORE) += cec.o
+obj-y += core/
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * cec-adap.c - HDMI Consumer Electronics Control framework - CEC adapter
- *
- * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
- */
-
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/kmod.h>
-#include <linux/ktime.h>
-#include <linux/slab.h>
-#include <linux/mm.h>
-#include <linux/string.h>
-#include <linux/types.h>
-
-#include <drm/drm_connector.h>
-#include <drm/drm_device.h>
-#include <drm/drm_edid.h>
-#include <drm/drm_file.h>
-
-#include "cec-priv.h"
-
-static void cec_fill_msg_report_features(struct cec_adapter *adap,
- struct cec_msg *msg,
- unsigned int la_idx);
-
-/*
- * 400 ms is the time it takes for one 16 byte message to be
- * transferred and 5 is the maximum number of retries. Add
- * another 100 ms as a margin. So if the transmit doesn't
- * finish before that time something is really wrong and we
- * have to time out.
- *
- * This is a sign that something it really wrong and a warning
- * will be issued.
- */
-#define CEC_XFER_TIMEOUT_MS (5 * 400 + 100)
-
-#define call_op(adap, op, arg...) \
- (adap->ops->op ? adap->ops->op(adap, ## arg) : 0)
-
-#define call_void_op(adap, op, arg...) \
- do { \
- if (adap->ops->op) \
- adap->ops->op(adap, ## arg); \
- } while (0)
-
-static int cec_log_addr2idx(const struct cec_adapter *adap, u8 log_addr)
-{
- int i;
-
- for (i = 0; i < adap->log_addrs.num_log_addrs; i++)
- if (adap->log_addrs.log_addr[i] == log_addr)
- return i;
- return -1;
-}
-
-static unsigned int cec_log_addr2dev(const struct cec_adapter *adap, u8 log_addr)
-{
- int i = cec_log_addr2idx(adap, log_addr);
-
- return adap->log_addrs.primary_device_type[i < 0 ? 0 : i];
-}
-
-u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size,
- unsigned int *offset)
-{
- unsigned int loc = cec_get_edid_spa_location(edid, size);
-
- if (offset)
- *offset = loc;
- if (loc == 0)
- return CEC_PHYS_ADDR_INVALID;
- return (edid[loc] << 8) | edid[loc + 1];
-}
-EXPORT_SYMBOL_GPL(cec_get_edid_phys_addr);
-
-void cec_fill_conn_info_from_drm(struct cec_connector_info *conn_info,
- const struct drm_connector *connector)
-{
- memset(conn_info, 0, sizeof(*conn_info));
- conn_info->type = CEC_CONNECTOR_TYPE_DRM;
- conn_info->drm.card_no = connector->dev->primary->index;
- conn_info->drm.connector_id = connector->base.id;
-}
-EXPORT_SYMBOL_GPL(cec_fill_conn_info_from_drm);
-
-/*
- * Queue a new event for this filehandle. If ts == 0, then set it
- * to the current time.
- *
- * We keep a queue of at most max_event events where max_event differs
- * per event. If the queue becomes full, then drop the oldest event and
- * keep track of how many events we've dropped.
- */
-void cec_queue_event_fh(struct cec_fh *fh,
- const struct cec_event *new_ev, u64 ts)
-{
- static const u16 max_events[CEC_NUM_EVENTS] = {
- 1, 1, 800, 800, 8, 8, 8, 8
- };
- struct cec_event_entry *entry;
- unsigned int ev_idx = new_ev->event - 1;
-
- if (WARN_ON(ev_idx >= ARRAY_SIZE(fh->events)))
- return;
-
- if (ts == 0)
- ts = ktime_get_ns();
-
- mutex_lock(&fh->lock);
- if (ev_idx < CEC_NUM_CORE_EVENTS)
- entry = &fh->core_events[ev_idx];
- else
- entry = kmalloc(sizeof(*entry), GFP_KERNEL);
- if (entry) {
- if (new_ev->event == CEC_EVENT_LOST_MSGS &&
- fh->queued_events[ev_idx]) {
- entry->ev.lost_msgs.lost_msgs +=
- new_ev->lost_msgs.lost_msgs;
- goto unlock;
- }
- entry->ev = *new_ev;
- entry->ev.ts = ts;
-
- if (fh->queued_events[ev_idx] < max_events[ev_idx]) {
- /* Add new msg at the end of the queue */
- list_add_tail(&entry->list, &fh->events[ev_idx]);
- fh->queued_events[ev_idx]++;
- fh->total_queued_events++;
- goto unlock;
- }
-
- if (ev_idx >= CEC_NUM_CORE_EVENTS) {
- list_add_tail(&entry->list, &fh->events[ev_idx]);
- /* drop the oldest event */
- entry = list_first_entry(&fh->events[ev_idx],
- struct cec_event_entry, list);
- list_del(&entry->list);
- kfree(entry);
- }
- }
- /* Mark that events were lost */
- entry = list_first_entry_or_null(&fh->events[ev_idx],
- struct cec_event_entry, list);
- if (entry)
- entry->ev.flags |= CEC_EVENT_FL_DROPPED_EVENTS;
-
-unlock:
- mutex_unlock(&fh->lock);
- wake_up_interruptible(&fh->wait);
-}
-
-/* Queue a new event for all open filehandles. */
-static void cec_queue_event(struct cec_adapter *adap,
- const struct cec_event *ev)
-{
- u64 ts = ktime_get_ns();
- struct cec_fh *fh;
-
- mutex_lock(&adap->devnode.lock);
- list_for_each_entry(fh, &adap->devnode.fhs, list)
- cec_queue_event_fh(fh, ev, ts);
- mutex_unlock(&adap->devnode.lock);
-}
-
-/* Notify userspace that the CEC pin changed state at the given time. */
-void cec_queue_pin_cec_event(struct cec_adapter *adap, bool is_high,
- bool dropped_events, ktime_t ts)
-{
- struct cec_event ev = {
- .event = is_high ? CEC_EVENT_PIN_CEC_HIGH :
- CEC_EVENT_PIN_CEC_LOW,
- .flags = dropped_events ? CEC_EVENT_FL_DROPPED_EVENTS : 0,
- };
- struct cec_fh *fh;
-
- mutex_lock(&adap->devnode.lock);
- list_for_each_entry(fh, &adap->devnode.fhs, list)
- if (fh->mode_follower == CEC_MODE_MONITOR_PIN)
- cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
- mutex_unlock(&adap->devnode.lock);
-}
-EXPORT_SYMBOL_GPL(cec_queue_pin_cec_event);
-
-/* Notify userspace that the HPD pin changed state at the given time. */
-void cec_queue_pin_hpd_event(struct cec_adapter *adap, bool is_high, ktime_t ts)
-{
- struct cec_event ev = {
- .event = is_high ? CEC_EVENT_PIN_HPD_HIGH :
- CEC_EVENT_PIN_HPD_LOW,
- };
- struct cec_fh *fh;
-
- mutex_lock(&adap->devnode.lock);
- list_for_each_entry(fh, &adap->devnode.fhs, list)
- cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
- mutex_unlock(&adap->devnode.lock);
-}
-EXPORT_SYMBOL_GPL(cec_queue_pin_hpd_event);
-
-/* Notify userspace that the 5V pin changed state at the given time. */
-void cec_queue_pin_5v_event(struct cec_adapter *adap, bool is_high, ktime_t ts)
-{
- struct cec_event ev = {
- .event = is_high ? CEC_EVENT_PIN_5V_HIGH :
- CEC_EVENT_PIN_5V_LOW,
- };
- struct cec_fh *fh;
-
- mutex_lock(&adap->devnode.lock);
- list_for_each_entry(fh, &adap->devnode.fhs, list)
- cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
- mutex_unlock(&adap->devnode.lock);
-}
-EXPORT_SYMBOL_GPL(cec_queue_pin_5v_event);
-
-/*
- * Queue a new message for this filehandle.
- *
- * We keep a queue of at most CEC_MAX_MSG_RX_QUEUE_SZ messages. If the
- * queue becomes full, then drop the oldest message and keep track
- * of how many messages we've dropped.
- */
-static void cec_queue_msg_fh(struct cec_fh *fh, const struct cec_msg *msg)
-{
- static const struct cec_event ev_lost_msgs = {
- .event = CEC_EVENT_LOST_MSGS,
- .flags = 0,
- {
- .lost_msgs = { 1 },
- },
- };
- struct cec_msg_entry *entry;
-
- mutex_lock(&fh->lock);
- entry = kmalloc(sizeof(*entry), GFP_KERNEL);
- if (entry) {
- entry->msg = *msg;
- /* Add new msg at the end of the queue */
- list_add_tail(&entry->list, &fh->msgs);
-
- if (fh->queued_msgs < CEC_MAX_MSG_RX_QUEUE_SZ) {
- /* All is fine if there is enough room */
- fh->queued_msgs++;
- mutex_unlock(&fh->lock);
- wake_up_interruptible(&fh->wait);
- return;
- }
-
- /*
- * if the message queue is full, then drop the oldest one and
- * send a lost message event.
- */
- entry = list_first_entry(&fh->msgs, struct cec_msg_entry, list);
- list_del(&entry->list);
- kfree(entry);
- }
- mutex_unlock(&fh->lock);
-
- /*
- * We lost a message, either because kmalloc failed or the queue
- * was full.
- */
- cec_queue_event_fh(fh, &ev_lost_msgs, ktime_get_ns());
-}
-
-/*
- * Queue the message for those filehandles that are in monitor mode.
- * If valid_la is true (this message is for us or was sent by us),
- * then pass it on to any monitoring filehandle. If this message
- * isn't for us or from us, then only give it to filehandles that
- * are in MONITOR_ALL mode.
- *
- * This can only happen if the CEC_CAP_MONITOR_ALL capability is
- * set and the CEC adapter was placed in 'monitor all' mode.
- */
-static void cec_queue_msg_monitor(struct cec_adapter *adap,
- const struct cec_msg *msg,
- bool valid_la)
-{
- struct cec_fh *fh;
- u32 monitor_mode = valid_la ? CEC_MODE_MONITOR :
- CEC_MODE_MONITOR_ALL;
-
- mutex_lock(&adap->devnode.lock);
- list_for_each_entry(fh, &adap->devnode.fhs, list) {
- if (fh->mode_follower >= monitor_mode)
- cec_queue_msg_fh(fh, msg);
- }
- mutex_unlock(&adap->devnode.lock);
-}
-
-/*
- * Queue the message for follower filehandles.
- */
-static void cec_queue_msg_followers(struct cec_adapter *adap,
- const struct cec_msg *msg)
-{
- struct cec_fh *fh;
-
- mutex_lock(&adap->devnode.lock);
- list_for_each_entry(fh, &adap->devnode.fhs, list) {
- if (fh->mode_follower == CEC_MODE_FOLLOWER)
- cec_queue_msg_fh(fh, msg);
- }
- mutex_unlock(&adap->devnode.lock);
-}
-
-/* Notify userspace of an adapter state change. */
-static void cec_post_state_event(struct cec_adapter *adap)
-{
- struct cec_event ev = {
- .event = CEC_EVENT_STATE_CHANGE,
- };
-
- ev.state_change.phys_addr = adap->phys_addr;
- ev.state_change.log_addr_mask = adap->log_addrs.log_addr_mask;
- ev.state_change.have_conn_info =
- adap->conn_info.type != CEC_CONNECTOR_TYPE_NO_CONNECTOR;
- cec_queue_event(adap, &ev);
-}
-
-/*
- * A CEC transmit (and a possible wait for reply) completed.
- * If this was in blocking mode, then complete it, otherwise
- * queue the message for userspace to dequeue later.
- *
- * This function is called with adap->lock held.
- */
-static void cec_data_completed(struct cec_data *data)
-{
- /*
- * Delete this transmit from the filehandle's xfer_list since
- * we're done with it.
- *
- * Note that if the filehandle is closed before this transmit
- * finished, then the release() function will set data->fh to NULL.
- * Without that we would be referring to a closed filehandle.
- */
- if (data->fh)
- list_del(&data->xfer_list);
-
- if (data->blocking) {
- /*
- * Someone is blocking so mark the message as completed
- * and call complete.
- */
- data->completed = true;
- complete(&data->c);
- } else {
- /*
- * No blocking, so just queue the message if needed and
- * free the memory.
- */
- if (data->fh)
- cec_queue_msg_fh(data->fh, &data->msg);
- kfree(data);
- }
-}
-
-/*
- * A pending CEC transmit needs to be cancelled, either because the CEC
- * adapter is disabled or the transmit takes an impossibly long time to
- * finish.
- *
- * This function is called with adap->lock held.
- */
-static void cec_data_cancel(struct cec_data *data, u8 tx_status)
-{
- /*
- * It's either the current transmit, or it is a pending
- * transmit. Take the appropriate action to clear it.
- */
- if (data->adap->transmitting == data) {
- data->adap->transmitting = NULL;
- } else {
- list_del_init(&data->list);
- if (!(data->msg.tx_status & CEC_TX_STATUS_OK))
- if (!WARN_ON(!data->adap->transmit_queue_sz))
- data->adap->transmit_queue_sz--;
- }
-
- if (data->msg.tx_status & CEC_TX_STATUS_OK) {
- data->msg.rx_ts = ktime_get_ns();
- data->msg.rx_status = CEC_RX_STATUS_ABORTED;
- } else {
- data->msg.tx_ts = ktime_get_ns();
- data->msg.tx_status |= tx_status |
- CEC_TX_STATUS_MAX_RETRIES;
- data->msg.tx_error_cnt++;
- data->attempts = 0;
- }
-
- /* Queue transmitted message for monitoring purposes */
- cec_queue_msg_monitor(data->adap, &data->msg, 1);
-
- cec_data_completed(data);
-}
-
-/*
- * Flush all pending transmits and cancel any pending timeout work.
- *
- * This function is called with adap->lock held.
- */
-static void cec_flush(struct cec_adapter *adap)
-{
- struct cec_data *data, *n;
-
- /*
- * If the adapter is disabled, or we're asked to stop,
- * then cancel any pending transmits.
- */
- while (!list_empty(&adap->transmit_queue)) {
- data = list_first_entry(&adap->transmit_queue,
- struct cec_data, list);
- cec_data_cancel(data, CEC_TX_STATUS_ABORTED);
- }
- if (adap->transmitting)
- cec_data_cancel(adap->transmitting, CEC_TX_STATUS_ABORTED);
-
- /* Cancel the pending timeout work. */
- list_for_each_entry_safe(data, n, &adap->wait_queue, list) {
- if (cancel_delayed_work(&data->work))
- cec_data_cancel(data, CEC_TX_STATUS_OK);
- /*
- * If cancel_delayed_work returned false, then
- * the cec_wait_timeout function is running,
- * which will call cec_data_completed. So no
- * need to do anything special in that case.
- */
- }
- /*
- * If something went wrong and this counter isn't what it should
- * be, then this will reset it back to 0. Warn if it is not 0,
- * since it indicates a bug, either in this framework or in a
- * CEC driver.
- */
- if (WARN_ON(adap->transmit_queue_sz))
- adap->transmit_queue_sz = 0;
-}
-
-/*
- * Main CEC state machine
- *
- * Wait until the thread should be stopped, or we are not transmitting and
- * a new transmit message is queued up, in which case we start transmitting
- * that message. When the adapter finished transmitting the message it will
- * call cec_transmit_done().
- *
- * If the adapter is disabled, then remove all queued messages instead.
- *
- * If the current transmit times out, then cancel that transmit.
- */
-int cec_thread_func(void *_adap)
-{
- struct cec_adapter *adap = _adap;
-
- for (;;) {
- unsigned int signal_free_time;
- struct cec_data *data;
- bool timeout = false;
- u8 attempts;
-
- if (adap->transmit_in_progress) {
- int err;
-
- /*
- * We are transmitting a message, so add a timeout
- * to prevent the state machine to get stuck waiting
- * for this message to finalize and add a check to
- * see if the adapter is disabled in which case the
- * transmit should be canceled.
- */
- err = wait_event_interruptible_timeout(adap->kthread_waitq,
- (adap->needs_hpd &&
- (!adap->is_configured && !adap->is_configuring)) ||
- kthread_should_stop() ||
- (!adap->transmit_in_progress &&
- !list_empty(&adap->transmit_queue)),
- msecs_to_jiffies(CEC_XFER_TIMEOUT_MS));
- timeout = err == 0;
- } else {
- /* Otherwise we just wait for something to happen. */
- wait_event_interruptible(adap->kthread_waitq,
- kthread_should_stop() ||
- (!adap->transmit_in_progress &&
- !list_empty(&adap->transmit_queue)));
- }
-
- mutex_lock(&adap->lock);
-
- if ((adap->needs_hpd &&
- (!adap->is_configured && !adap->is_configuring)) ||
- kthread_should_stop()) {
- cec_flush(adap);
- goto unlock;
- }
-
- if (adap->transmit_in_progress && timeout) {
- /*
- * If we timeout, then log that. Normally this does
- * not happen and it is an indication of a faulty CEC
- * adapter driver, or the CEC bus is in some weird
- * state. On rare occasions it can happen if there is
- * so much traffic on the bus that the adapter was
- * unable to transmit for CEC_XFER_TIMEOUT_MS (2.1s).
- */
- if (adap->transmitting) {
- pr_warn("cec-%s: message %*ph timed out\n", adap->name,
- adap->transmitting->msg.len,
- adap->transmitting->msg.msg);
- /* Just give up on this. */
- cec_data_cancel(adap->transmitting,
- CEC_TX_STATUS_TIMEOUT);
- } else {
- pr_warn("cec-%s: transmit timed out\n", adap->name);
- }
- adap->transmit_in_progress = false;
- adap->tx_timeouts++;
- goto unlock;
- }
-
- /*
- * If we are still transmitting, or there is nothing new to
- * transmit, then just continue waiting.
- */
- if (adap->transmit_in_progress || list_empty(&adap->transmit_queue))
- goto unlock;
-
- /* Get a new message to transmit */
- data = list_first_entry(&adap->transmit_queue,
- struct cec_data, list);
- list_del_init(&data->list);
- if (!WARN_ON(!data->adap->transmit_queue_sz))
- adap->transmit_queue_sz--;
-
- /* Make this the current transmitting message */
- adap->transmitting = data;
-
- /*
- * Suggested number of attempts as per the CEC 2.0 spec:
- * 4 attempts is the default, except for 'secondary poll
- * messages', i.e. poll messages not sent during the adapter
- * configuration phase when it allocates logical addresses.
- */
- if (data->msg.len == 1 && adap->is_configured)
- attempts = 2;
- else
- attempts = 4;
-
- /* Set the suggested signal free time */
- if (data->attempts) {
- /* should be >= 3 data bit periods for a retry */
- signal_free_time = CEC_SIGNAL_FREE_TIME_RETRY;
- } else if (adap->last_initiator !=
- cec_msg_initiator(&data->msg)) {
- /* should be >= 5 data bit periods for new initiator */
- signal_free_time = CEC_SIGNAL_FREE_TIME_NEW_INITIATOR;
- adap->last_initiator = cec_msg_initiator(&data->msg);
- } else {
- /*
- * should be >= 7 data bit periods for sending another
- * frame immediately after another.
- */
- signal_free_time = CEC_SIGNAL_FREE_TIME_NEXT_XFER;
- }
- if (data->attempts == 0)
- data->attempts = attempts;
-
- /* Tell the adapter to transmit, cancel on error */
- if (adap->ops->adap_transmit(adap, data->attempts,
- signal_free_time, &data->msg))
- cec_data_cancel(data, CEC_TX_STATUS_ABORTED);
- else
- adap->transmit_in_progress = true;
-
-unlock:
- mutex_unlock(&adap->lock);
-
- if (kthread_should_stop())
- break;
- }
- return 0;
-}
-
-/*
- * Called by the CEC adapter if a transmit finished.
- */
-void cec_transmit_done_ts(struct cec_adapter *adap, u8 status,
- u8 arb_lost_cnt, u8 nack_cnt, u8 low_drive_cnt,
- u8 error_cnt, ktime_t ts)
-{
- struct cec_data *data;
- struct cec_msg *msg;
- unsigned int attempts_made = arb_lost_cnt + nack_cnt +
- low_drive_cnt + error_cnt;
-
- dprintk(2, "%s: status 0x%02x\n", __func__, status);
- if (attempts_made < 1)
- attempts_made = 1;
-
- mutex_lock(&adap->lock);
- data = adap->transmitting;
- if (!data) {
- /*
- * This might happen if a transmit was issued and the cable is
- * unplugged while the transmit is ongoing. Ignore this
- * transmit in that case.
- */
- if (!adap->transmit_in_progress)
- dprintk(1, "%s was called without an ongoing transmit!\n",
- __func__);
- adap->transmit_in_progress = false;
- goto wake_thread;
- }
- adap->transmit_in_progress = false;
-
- msg = &data->msg;
-
- /* Drivers must fill in the status! */
- WARN_ON(status == 0);
- msg->tx_ts = ktime_to_ns(ts);
- msg->tx_status |= status;
- msg->tx_arb_lost_cnt += arb_lost_cnt;
- msg->tx_nack_cnt += nack_cnt;
- msg->tx_low_drive_cnt += low_drive_cnt;
- msg->tx_error_cnt += error_cnt;
-
- /* Mark that we're done with this transmit */
- adap->transmitting = NULL;
-
- /*
- * If there are still retry attempts left and there was an error and
- * the hardware didn't signal that it retried itself (by setting
- * CEC_TX_STATUS_MAX_RETRIES), then we will retry ourselves.
- */
- if (data->attempts > attempts_made &&
- !(status & (CEC_TX_STATUS_MAX_RETRIES | CEC_TX_STATUS_OK))) {
- /* Retry this message */
- data->attempts -= attempts_made;
- if (msg->timeout)
- dprintk(2, "retransmit: %*ph (attempts: %d, wait for 0x%02x)\n",
- msg->len, msg->msg, data->attempts, msg->reply);
- else
- dprintk(2, "retransmit: %*ph (attempts: %d)\n",
- msg->len, msg->msg, data->attempts);
- /* Add the message in front of the transmit queue */
- list_add(&data->list, &adap->transmit_queue);
- adap->transmit_queue_sz++;
- goto wake_thread;
- }
-
- data->attempts = 0;
-
- /* Always set CEC_TX_STATUS_MAX_RETRIES on error */
- if (!(status & CEC_TX_STATUS_OK))
- msg->tx_status |= CEC_TX_STATUS_MAX_RETRIES;
-
- /* Queue transmitted message for monitoring purposes */
- cec_queue_msg_monitor(adap, msg, 1);
-
- if ((status & CEC_TX_STATUS_OK) && adap->is_configured &&
- msg->timeout) {
- /*
- * Queue the message into the wait queue if we want to wait
- * for a reply.
- */
- list_add_tail(&data->list, &adap->wait_queue);
- schedule_delayed_work(&data->work,
- msecs_to_jiffies(msg->timeout));
- } else {
- /* Otherwise we're done */
- cec_data_completed(data);
- }
-
-wake_thread:
- /*
- * Wake up the main thread to see if another message is ready
- * for transmitting or to retry the current message.
- */
- wake_up_interruptible(&adap->kthread_waitq);
- mutex_unlock(&adap->lock);
-}
-EXPORT_SYMBOL_GPL(cec_transmit_done_ts);
-
-void cec_transmit_attempt_done_ts(struct cec_adapter *adap,
- u8 status, ktime_t ts)
-{
- switch (status & ~CEC_TX_STATUS_MAX_RETRIES) {
- case CEC_TX_STATUS_OK:
- cec_transmit_done_ts(adap, status, 0, 0, 0, 0, ts);
- return;
- case CEC_TX_STATUS_ARB_LOST:
- cec_transmit_done_ts(adap, status, 1, 0, 0, 0, ts);
- return;
- case CEC_TX_STATUS_NACK:
- cec_transmit_done_ts(adap, status, 0, 1, 0, 0, ts);
- return;
- case CEC_TX_STATUS_LOW_DRIVE:
- cec_transmit_done_ts(adap, status, 0, 0, 1, 0, ts);
- return;
- case CEC_TX_STATUS_ERROR:
- cec_transmit_done_ts(adap, status, 0, 0, 0, 1, ts);
- return;
- default:
- /* Should never happen */
- WARN(1, "cec-%s: invalid status 0x%02x\n", adap->name, status);
- return;
- }
-}
-EXPORT_SYMBOL_GPL(cec_transmit_attempt_done_ts);
-
-/*
- * Called when waiting for a reply times out.
- */
-static void cec_wait_timeout(struct work_struct *work)
-{
- struct cec_data *data = container_of(work, struct cec_data, work.work);
- struct cec_adapter *adap = data->adap;
-
- mutex_lock(&adap->lock);
- /*
- * Sanity check in case the timeout and the arrival of the message
- * happened at the same time.
- */
- if (list_empty(&data->list))
- goto unlock;
-
- /* Mark the message as timed out */
- list_del_init(&data->list);
- data->msg.rx_ts = ktime_get_ns();
- data->msg.rx_status = CEC_RX_STATUS_TIMEOUT;
- cec_data_completed(data);
-unlock:
- mutex_unlock(&adap->lock);
-}
-
-/*
- * Transmit a message. The fh argument may be NULL if the transmit is not
- * associated with a specific filehandle.
- *
- * This function is called with adap->lock held.
- */
-int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
- struct cec_fh *fh, bool block)
-{
- struct cec_data *data;
- bool is_raw = msg_is_raw(msg);
-
- msg->rx_ts = 0;
- msg->tx_ts = 0;
- msg->rx_status = 0;
- msg->tx_status = 0;
- msg->tx_arb_lost_cnt = 0;
- msg->tx_nack_cnt = 0;
- msg->tx_low_drive_cnt = 0;
- msg->tx_error_cnt = 0;
- msg->sequence = 0;
-
- if (msg->reply && msg->timeout == 0) {
- /* Make sure the timeout isn't 0. */
- msg->timeout = 1000;
- }
- msg->flags &= CEC_MSG_FL_REPLY_TO_FOLLOWERS | CEC_MSG_FL_RAW;
-
- if (!msg->timeout)
- msg->flags &= ~CEC_MSG_FL_REPLY_TO_FOLLOWERS;
-
- /* Sanity checks */
- if (msg->len == 0 || msg->len > CEC_MAX_MSG_SIZE) {
- dprintk(1, "%s: invalid length %d\n", __func__, msg->len);
- return -EINVAL;
- }
-
- memset(msg->msg + msg->len, 0, sizeof(msg->msg) - msg->len);
-
- if (msg->timeout)
- dprintk(2, "%s: %*ph (wait for 0x%02x%s)\n",
- __func__, msg->len, msg->msg, msg->reply,
- !block ? ", nb" : "");
- else
- dprintk(2, "%s: %*ph%s\n",
- __func__, msg->len, msg->msg, !block ? " (nb)" : "");
-
- if (msg->timeout && msg->len == 1) {
- dprintk(1, "%s: can't reply to poll msg\n", __func__);
- return -EINVAL;
- }
-
- if (is_raw) {
- if (!capable(CAP_SYS_RAWIO))
- return -EPERM;
- } else {
- /* A CDC-Only device can only send CDC messages */
- if ((adap->log_addrs.flags & CEC_LOG_ADDRS_FL_CDC_ONLY) &&
- (msg->len == 1 || msg->msg[1] != CEC_MSG_CDC_MESSAGE)) {
- dprintk(1, "%s: not a CDC message\n", __func__);
- return -EINVAL;
- }
-
- if (msg->len >= 4 && msg->msg[1] == CEC_MSG_CDC_MESSAGE) {
- msg->msg[2] = adap->phys_addr >> 8;
- msg->msg[3] = adap->phys_addr & 0xff;
- }
-
- if (msg->len == 1) {
- if (cec_msg_destination(msg) == 0xf) {
- dprintk(1, "%s: invalid poll message\n",
- __func__);
- return -EINVAL;
- }
- if (cec_has_log_addr(adap, cec_msg_destination(msg))) {
- /*
- * If the destination is a logical address our
- * adapter has already claimed, then just NACK
- * this. It depends on the hardware what it will
- * do with a POLL to itself (some OK this), so
- * it is just as easy to handle it here so the
- * behavior will be consistent.
- */
- msg->tx_ts = ktime_get_ns();
- msg->tx_status = CEC_TX_STATUS_NACK |
- CEC_TX_STATUS_MAX_RETRIES;
- msg->tx_nack_cnt = 1;
- msg->sequence = ++adap->sequence;
- if (!msg->sequence)
- msg->sequence = ++adap->sequence;
- return 0;
- }
- }
- if (msg->len > 1 && !cec_msg_is_broadcast(msg) &&
- cec_has_log_addr(adap, cec_msg_destination(msg))) {
- dprintk(1, "%s: destination is the adapter itself\n",
- __func__);
- return -EINVAL;
- }
- if (msg->len > 1 && adap->is_configured &&
- !cec_has_log_addr(adap, cec_msg_initiator(msg))) {
- dprintk(1, "%s: initiator has unknown logical address %d\n",
- __func__, cec_msg_initiator(msg));
- return -EINVAL;
- }
- /*
- * Special case: allow Ping and IMAGE/TEXT_VIEW_ON to be
- * transmitted to a TV, even if the adapter is unconfigured.
- * This makes it possible to detect or wake up displays that
- * pull down the HPD when in standby.
- */
- if (!adap->is_configured && !adap->is_configuring &&
- (msg->len > 2 ||
- cec_msg_destination(msg) != CEC_LOG_ADDR_TV ||
- (msg->len == 2 && msg->msg[1] != CEC_MSG_IMAGE_VIEW_ON &&
- msg->msg[1] != CEC_MSG_TEXT_VIEW_ON))) {
- dprintk(1, "%s: adapter is unconfigured\n", __func__);
- return -ENONET;
- }
- }
-
- if (!adap->is_configured && !adap->is_configuring) {
- if (adap->needs_hpd) {
- dprintk(1, "%s: adapter is unconfigured and needs HPD\n",
- __func__);
- return -ENONET;
- }
- if (msg->reply) {
- dprintk(1, "%s: invalid msg->reply\n", __func__);
- return -EINVAL;
- }
- }
-
- if (adap->transmit_queue_sz >= CEC_MAX_MSG_TX_QUEUE_SZ) {
- dprintk(2, "%s: transmit queue full\n", __func__);
- return -EBUSY;
- }
-
- data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- msg->sequence = ++adap->sequence;
- if (!msg->sequence)
- msg->sequence = ++adap->sequence;
-
- data->msg = *msg;
- data->fh = fh;
- data->adap = adap;
- data->blocking = block;
-
- init_completion(&data->c);
- INIT_DELAYED_WORK(&data->work, cec_wait_timeout);
-
- if (fh)
- list_add_tail(&data->xfer_list, &fh->xfer_list);
-
- list_add_tail(&data->list, &adap->transmit_queue);
- adap->transmit_queue_sz++;
- if (!adap->transmitting)
- wake_up_interruptible(&adap->kthread_waitq);
-
- /* All done if we don't need to block waiting for completion */
- if (!block)
- return 0;
-
- /*
- * Release the lock and wait, retake the lock afterwards.
- */
- mutex_unlock(&adap->lock);
- wait_for_completion_killable(&data->c);
- if (!data->completed)
- cancel_delayed_work_sync(&data->work);
- mutex_lock(&adap->lock);
-
- /* Cancel the transmit if it was interrupted */
- if (!data->completed)
- cec_data_cancel(data, CEC_TX_STATUS_ABORTED);
-
- /* The transmit completed (possibly with an error) */
- *msg = data->msg;
- kfree(data);
- return 0;
-}
-
-/* Helper function to be used by drivers and this framework. */
-int cec_transmit_msg(struct cec_adapter *adap, struct cec_msg *msg,
- bool block)
-{
- int ret;
-
- mutex_lock(&adap->lock);
- ret = cec_transmit_msg_fh(adap, msg, NULL, block);
- mutex_unlock(&adap->lock);
- return ret;
-}
-EXPORT_SYMBOL_GPL(cec_transmit_msg);
-
-/*
- * I don't like forward references but without this the low-level
- * cec_received_msg() function would come after a bunch of high-level
- * CEC protocol handling functions. That was very confusing.
- */
-static int cec_receive_notify(struct cec_adapter *adap, struct cec_msg *msg,
- bool is_reply);
-
-#define DIRECTED 0x80
-#define BCAST1_4 0x40
-#define BCAST2_0 0x20 /* broadcast only allowed for >= 2.0 */
-#define BCAST (BCAST1_4 | BCAST2_0)
-#define BOTH (BCAST | DIRECTED)
-
-/*
- * Specify minimum length and whether the message is directed, broadcast
- * or both. Messages that do not match the criteria are ignored as per
- * the CEC specification.
- */
-static const u8 cec_msg_size[256] = {
- [CEC_MSG_ACTIVE_SOURCE] = 4 | BCAST,
- [CEC_MSG_IMAGE_VIEW_ON] = 2 | DIRECTED,
- [CEC_MSG_TEXT_VIEW_ON] = 2 | DIRECTED,
- [CEC_MSG_INACTIVE_SOURCE] = 4 | DIRECTED,
- [CEC_MSG_REQUEST_ACTIVE_SOURCE] = 2 | BCAST,
- [CEC_MSG_ROUTING_CHANGE] = 6 | BCAST,
- [CEC_MSG_ROUTING_INFORMATION] = 4 | BCAST,
- [CEC_MSG_SET_STREAM_PATH] = 4 | BCAST,
- [CEC_MSG_STANDBY] = 2 | BOTH,
- [CEC_MSG_RECORD_OFF] = 2 | DIRECTED,
- [CEC_MSG_RECORD_ON] = 3 | DIRECTED,
- [CEC_MSG_RECORD_STATUS] = 3 | DIRECTED,
- [CEC_MSG_RECORD_TV_SCREEN] = 2 | DIRECTED,
- [CEC_MSG_CLEAR_ANALOGUE_TIMER] = 13 | DIRECTED,
- [CEC_MSG_CLEAR_DIGITAL_TIMER] = 16 | DIRECTED,
- [CEC_MSG_CLEAR_EXT_TIMER] = 13 | DIRECTED,
- [CEC_MSG_SET_ANALOGUE_TIMER] = 13 | DIRECTED,
- [CEC_MSG_SET_DIGITAL_TIMER] = 16 | DIRECTED,
- [CEC_MSG_SET_EXT_TIMER] = 13 | DIRECTED,
- [CEC_MSG_SET_TIMER_PROGRAM_TITLE] = 2 | DIRECTED,
- [CEC_MSG_TIMER_CLEARED_STATUS] = 3 | DIRECTED,
- [CEC_MSG_TIMER_STATUS] = 3 | DIRECTED,
- [CEC_MSG_CEC_VERSION] = 3 | DIRECTED,
- [CEC_MSG_GET_CEC_VERSION] = 2 | DIRECTED,
- [CEC_MSG_GIVE_PHYSICAL_ADDR] = 2 | DIRECTED,
- [CEC_MSG_GET_MENU_LANGUAGE] = 2 | DIRECTED,
- [CEC_MSG_REPORT_PHYSICAL_ADDR] = 5 | BCAST,
- [CEC_MSG_SET_MENU_LANGUAGE] = 5 | BCAST,
- [CEC_MSG_REPORT_FEATURES] = 6 | BCAST,
- [CEC_MSG_GIVE_FEATURES] = 2 | DIRECTED,
- [CEC_MSG_DECK_CONTROL] = 3 | DIRECTED,
- [CEC_MSG_DECK_STATUS] = 3 | DIRECTED,
- [CEC_MSG_GIVE_DECK_STATUS] = 3 | DIRECTED,
- [CEC_MSG_PLAY] = 3 | DIRECTED,
- [CEC_MSG_GIVE_TUNER_DEVICE_STATUS] = 3 | DIRECTED,
- [CEC_MSG_SELECT_ANALOGUE_SERVICE] = 6 | DIRECTED,
- [CEC_MSG_SELECT_DIGITAL_SERVICE] = 9 | DIRECTED,
- [CEC_MSG_TUNER_DEVICE_STATUS] = 7 | DIRECTED,
- [CEC_MSG_TUNER_STEP_DECREMENT] = 2 | DIRECTED,
- [CEC_MSG_TUNER_STEP_INCREMENT] = 2 | DIRECTED,
- [CEC_MSG_DEVICE_VENDOR_ID] = 5 | BCAST,
- [CEC_MSG_GIVE_DEVICE_VENDOR_ID] = 2 | DIRECTED,
- [CEC_MSG_VENDOR_COMMAND] = 2 | DIRECTED,
- [CEC_MSG_VENDOR_COMMAND_WITH_ID] = 5 | BOTH,
- [CEC_MSG_VENDOR_REMOTE_BUTTON_DOWN] = 2 | BOTH,
- [CEC_MSG_VENDOR_REMOTE_BUTTON_UP] = 2 | BOTH,
- [CEC_MSG_SET_OSD_STRING] = 3 | DIRECTED,
- [CEC_MSG_GIVE_OSD_NAME] = 2 | DIRECTED,
- [CEC_MSG_SET_OSD_NAME] = 2 | DIRECTED,
- [CEC_MSG_MENU_REQUEST] = 3 | DIRECTED,
- [CEC_MSG_MENU_STATUS] = 3 | DIRECTED,
- [CEC_MSG_USER_CONTROL_PRESSED] = 3 | DIRECTED,
- [CEC_MSG_USER_CONTROL_RELEASED] = 2 | DIRECTED,
- [CEC_MSG_GIVE_DEVICE_POWER_STATUS] = 2 | DIRECTED,
- [CEC_MSG_REPORT_POWER_STATUS] = 3 | DIRECTED | BCAST2_0,
- [CEC_MSG_FEATURE_ABORT] = 4 | DIRECTED,
- [CEC_MSG_ABORT] = 2 | DIRECTED,
- [CEC_MSG_GIVE_AUDIO_STATUS] = 2 | DIRECTED,
- [CEC_MSG_GIVE_SYSTEM_AUDIO_MODE_STATUS] = 2 | DIRECTED,
- [CEC_MSG_REPORT_AUDIO_STATUS] = 3 | DIRECTED,
- [CEC_MSG_REPORT_SHORT_AUDIO_DESCRIPTOR] = 2 | DIRECTED,
- [CEC_MSG_REQUEST_SHORT_AUDIO_DESCRIPTOR] = 2 | DIRECTED,
- [CEC_MSG_SET_SYSTEM_AUDIO_MODE] = 3 | BOTH,
- [CEC_MSG_SYSTEM_AUDIO_MODE_REQUEST] = 2 | DIRECTED,
- [CEC_MSG_SYSTEM_AUDIO_MODE_STATUS] = 3 | DIRECTED,
- [CEC_MSG_SET_AUDIO_RATE] = 3 | DIRECTED,
- [CEC_MSG_INITIATE_ARC] = 2 | DIRECTED,
- [CEC_MSG_REPORT_ARC_INITIATED] = 2 | DIRECTED,
- [CEC_MSG_REPORT_ARC_TERMINATED] = 2 | DIRECTED,
- [CEC_MSG_REQUEST_ARC_INITIATION] = 2 | DIRECTED,
- [CEC_MSG_REQUEST_ARC_TERMINATION] = 2 | DIRECTED,
- [CEC_MSG_TERMINATE_ARC] = 2 | DIRECTED,
- [CEC_MSG_REQUEST_CURRENT_LATENCY] = 4 | BCAST,
- [CEC_MSG_REPORT_CURRENT_LATENCY] = 6 | BCAST,
- [CEC_MSG_CDC_MESSAGE] = 2 | BCAST,
-};
-
-/* Called by the CEC adapter if a message is received */
-void cec_received_msg_ts(struct cec_adapter *adap,
- struct cec_msg *msg, ktime_t ts)
-{
- struct cec_data *data;
- u8 msg_init = cec_msg_initiator(msg);
- u8 msg_dest = cec_msg_destination(msg);
- u8 cmd = msg->msg[1];
- bool is_reply = false;
- bool valid_la = true;
- u8 min_len = 0;
-
- if (WARN_ON(!msg->len || msg->len > CEC_MAX_MSG_SIZE))
- return;
-
- /*
- * Some CEC adapters will receive the messages that they transmitted.
- * This test filters out those messages by checking if we are the
- * initiator, and just returning in that case.
- *
- * Note that this won't work if this is an Unregistered device.
- *
- * It is bad practice if the hardware receives the message that it
- * transmitted and luckily most CEC adapters behave correctly in this
- * respect.
- */
- if (msg_init != CEC_LOG_ADDR_UNREGISTERED &&
- cec_has_log_addr(adap, msg_init))
- return;
-
- msg->rx_ts = ktime_to_ns(ts);
- msg->rx_status = CEC_RX_STATUS_OK;
- msg->sequence = msg->reply = msg->timeout = 0;
- msg->tx_status = 0;
- msg->tx_ts = 0;
- msg->tx_arb_lost_cnt = 0;
- msg->tx_nack_cnt = 0;
- msg->tx_low_drive_cnt = 0;
- msg->tx_error_cnt = 0;
- msg->flags = 0;
- memset(msg->msg + msg->len, 0, sizeof(msg->msg) - msg->len);
-
- mutex_lock(&adap->lock);
- dprintk(2, "%s: %*ph\n", __func__, msg->len, msg->msg);
-
- adap->last_initiator = 0xff;
-
- /* Check if this message was for us (directed or broadcast). */
- if (!cec_msg_is_broadcast(msg))
- valid_la = cec_has_log_addr(adap, msg_dest);
-
- /*
- * Check if the length is not too short or if the message is a
- * broadcast message where a directed message was expected or
- * vice versa. If so, then the message has to be ignored (according
- * to section CEC 7.3 and CEC 12.2).
- */
- if (valid_la && msg->len > 1 && cec_msg_size[cmd]) {
- u8 dir_fl = cec_msg_size[cmd] & BOTH;
-
- min_len = cec_msg_size[cmd] & 0x1f;
- if (msg->len < min_len)
- valid_la = false;
- else if (!cec_msg_is_broadcast(msg) && !(dir_fl & DIRECTED))
- valid_la = false;
- else if (cec_msg_is_broadcast(msg) && !(dir_fl & BCAST))
- valid_la = false;
- else if (cec_msg_is_broadcast(msg) &&
- adap->log_addrs.cec_version < CEC_OP_CEC_VERSION_2_0 &&
- !(dir_fl & BCAST1_4))
- valid_la = false;
- }
- if (valid_la && min_len) {
- /* These messages have special length requirements */
- switch (cmd) {
- case CEC_MSG_TIMER_STATUS:
- if (msg->msg[2] & 0x10) {
- switch (msg->msg[2] & 0xf) {
- case CEC_OP_PROG_INFO_NOT_ENOUGH_SPACE:
- case CEC_OP_PROG_INFO_MIGHT_NOT_BE_ENOUGH_SPACE:
- if (msg->len < 5)
- valid_la = false;
- break;
- }
- } else if ((msg->msg[2] & 0xf) == CEC_OP_PROG_ERROR_DUPLICATE) {
- if (msg->len < 5)
- valid_la = false;
- }
- break;
- case CEC_MSG_RECORD_ON:
- switch (msg->msg[2]) {
- case CEC_OP_RECORD_SRC_OWN:
- break;
- case CEC_OP_RECORD_SRC_DIGITAL:
- if (msg->len < 10)
- valid_la = false;
- break;
- case CEC_OP_RECORD_SRC_ANALOG:
- if (msg->len < 7)
- valid_la = false;
- break;
- case CEC_OP_RECORD_SRC_EXT_PLUG:
- if (msg->len < 4)
- valid_la = false;
- break;
- case CEC_OP_RECORD_SRC_EXT_PHYS_ADDR:
- if (msg->len < 5)
- valid_la = false;
- break;
- }
- break;
- }
- }
-
- /* It's a valid message and not a poll or CDC message */
- if (valid_la && msg->len > 1 && cmd != CEC_MSG_CDC_MESSAGE) {
- bool abort = cmd == CEC_MSG_FEATURE_ABORT;
-
- /* The aborted command is in msg[2] */
- if (abort)
- cmd = msg->msg[2];
-
- /*
- * Walk over all transmitted messages that are waiting for a
- * reply.
- */
- list_for_each_entry(data, &adap->wait_queue, list) {
- struct cec_msg *dst = &data->msg;
-
- /*
- * The *only* CEC message that has two possible replies
- * is CEC_MSG_INITIATE_ARC.
- * In this case allow either of the two replies.
- */
- if (!abort && dst->msg[1] == CEC_MSG_INITIATE_ARC &&
- (cmd == CEC_MSG_REPORT_ARC_INITIATED ||
- cmd == CEC_MSG_REPORT_ARC_TERMINATED) &&
- (dst->reply == CEC_MSG_REPORT_ARC_INITIATED ||
- dst->reply == CEC_MSG_REPORT_ARC_TERMINATED))
- dst->reply = cmd;
-
- /* Does the command match? */
- if ((abort && cmd != dst->msg[1]) ||
- (!abort && cmd != dst->reply))
- continue;
-
- /* Does the addressing match? */
- if (msg_init != cec_msg_destination(dst) &&
- !cec_msg_is_broadcast(dst))
- continue;
-
- /* We got a reply */
- memcpy(dst->msg, msg->msg, msg->len);
- dst->len = msg->len;
- dst->rx_ts = msg->rx_ts;
- dst->rx_status = msg->rx_status;
- if (abort)
- dst->rx_status |= CEC_RX_STATUS_FEATURE_ABORT;
- msg->flags = dst->flags;
- /* Remove it from the wait_queue */
- list_del_init(&data->list);
-
- /* Cancel the pending timeout work */
- if (!cancel_delayed_work(&data->work)) {
- mutex_unlock(&adap->lock);
- flush_scheduled_work();
- mutex_lock(&adap->lock);
- }
- /*
- * Mark this as a reply, provided someone is still
- * waiting for the answer.
- */
- if (data->fh)
- is_reply = true;
- cec_data_completed(data);
- break;
- }
- }
- mutex_unlock(&adap->lock);
-
- /* Pass the message on to any monitoring filehandles */
- cec_queue_msg_monitor(adap, msg, valid_la);
-
- /* We're done if it is not for us or a poll message */
- if (!valid_la || msg->len <= 1)
- return;
-
- if (adap->log_addrs.log_addr_mask == 0)
- return;
-
- /*
- * Process the message on the protocol level. If is_reply is true,
- * then cec_receive_notify() won't pass on the reply to the listener(s)
- * since that was already done by cec_data_completed() above.
- */
- cec_receive_notify(adap, msg, is_reply);
-}
-EXPORT_SYMBOL_GPL(cec_received_msg_ts);
-
-/* Logical Address Handling */
-
-/*
- * Attempt to claim a specific logical address.
- *
- * This function is called with adap->lock held.
- */
-static int cec_config_log_addr(struct cec_adapter *adap,
- unsigned int idx,
- unsigned int log_addr)
-{
- struct cec_log_addrs *las = &adap->log_addrs;
- struct cec_msg msg = { };
- const unsigned int max_retries = 2;
- unsigned int i;
- int err;
-
- if (cec_has_log_addr(adap, log_addr))
- return 0;
-
- /* Send poll message */
- msg.len = 1;
- msg.msg[0] = (log_addr << 4) | log_addr;
-
- for (i = 0; i < max_retries; i++) {
- err = cec_transmit_msg_fh(adap, &msg, NULL, true);
-
- /*
- * While trying to poll the physical address was reset
- * and the adapter was unconfigured, so bail out.
- */
- if (!adap->is_configuring)
- return -EINTR;
-
- if (err)
- return err;
-
- /*
- * The message was aborted due to a disconnect or
- * unconfigure, just bail out.
- */
- if (msg.tx_status & CEC_TX_STATUS_ABORTED)
- return -EINTR;
- if (msg.tx_status & CEC_TX_STATUS_OK)
- return 0;
- if (msg.tx_status & CEC_TX_STATUS_NACK)
- break;
- /*
- * Retry up to max_retries times if the message was neither
- * OKed or NACKed. This can happen due to e.g. a Lost
- * Arbitration condition.
- */
- }
-
- /*
- * If we are unable to get an OK or a NACK after max_retries attempts
- * (and note that each attempt already consists of four polls), then
- * then we assume that something is really weird and that it is not a
- * good idea to try and claim this logical address.
- */
- if (i == max_retries)
- return 0;
-
- /*
- * Message not acknowledged, so this logical
- * address is free to use.
- */
- err = adap->ops->adap_log_addr(adap, log_addr);
- if (err)
- return err;
-
- las->log_addr[idx] = log_addr;
- las->log_addr_mask |= 1 << log_addr;
- adap->phys_addrs[log_addr] = adap->phys_addr;
- return 1;
-}
-
-/*
- * Unconfigure the adapter: clear all logical addresses and send
- * the state changed event.
- *
- * This function is called with adap->lock held.
- */
-static void cec_adap_unconfigure(struct cec_adapter *adap)
-{
- if (!adap->needs_hpd ||
- adap->phys_addr != CEC_PHYS_ADDR_INVALID)
- WARN_ON(adap->ops->adap_log_addr(adap, CEC_LOG_ADDR_INVALID));
- adap->log_addrs.log_addr_mask = 0;
- adap->is_configuring = false;
- adap->is_configured = false;
- memset(adap->phys_addrs, 0xff, sizeof(adap->phys_addrs));
- cec_flush(adap);
- wake_up_interruptible(&adap->kthread_waitq);
- cec_post_state_event(adap);
-}
-
-/*
- * Attempt to claim the required logical addresses.
- */
-static int cec_config_thread_func(void *arg)
-{
- /* The various LAs for each type of device */
- static const u8 tv_log_addrs[] = {
- CEC_LOG_ADDR_TV, CEC_LOG_ADDR_SPECIFIC,
- CEC_LOG_ADDR_INVALID
- };
- static const u8 record_log_addrs[] = {
- CEC_LOG_ADDR_RECORD_1, CEC_LOG_ADDR_RECORD_2,
- CEC_LOG_ADDR_RECORD_3,
- CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2,
- CEC_LOG_ADDR_INVALID
- };
- static const u8 tuner_log_addrs[] = {
- CEC_LOG_ADDR_TUNER_1, CEC_LOG_ADDR_TUNER_2,
- CEC_LOG_ADDR_TUNER_3, CEC_LOG_ADDR_TUNER_4,
- CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2,
- CEC_LOG_ADDR_INVALID
- };
- static const u8 playback_log_addrs[] = {
- CEC_LOG_ADDR_PLAYBACK_1, CEC_LOG_ADDR_PLAYBACK_2,
- CEC_LOG_ADDR_PLAYBACK_3,
- CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2,
- CEC_LOG_ADDR_INVALID
- };
- static const u8 audiosystem_log_addrs[] = {
- CEC_LOG_ADDR_AUDIOSYSTEM,
- CEC_LOG_ADDR_INVALID
- };
- static const u8 specific_use_log_addrs[] = {
- CEC_LOG_ADDR_SPECIFIC,
- CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2,
- CEC_LOG_ADDR_INVALID
- };
- static const u8 *type2addrs[6] = {
- [CEC_LOG_ADDR_TYPE_TV] = tv_log_addrs,
- [CEC_LOG_ADDR_TYPE_RECORD] = record_log_addrs,
- [CEC_LOG_ADDR_TYPE_TUNER] = tuner_log_addrs,
- [CEC_LOG_ADDR_TYPE_PLAYBACK] = playback_log_addrs,
- [CEC_LOG_ADDR_TYPE_AUDIOSYSTEM] = audiosystem_log_addrs,
- [CEC_LOG_ADDR_TYPE_SPECIFIC] = specific_use_log_addrs,
- };
- static const u16 type2mask[] = {
- [CEC_LOG_ADDR_TYPE_TV] = CEC_LOG_ADDR_MASK_TV,
- [CEC_LOG_ADDR_TYPE_RECORD] = CEC_LOG_ADDR_MASK_RECORD,
- [CEC_LOG_ADDR_TYPE_TUNER] = CEC_LOG_ADDR_MASK_TUNER,
- [CEC_LOG_ADDR_TYPE_PLAYBACK] = CEC_LOG_ADDR_MASK_PLAYBACK,
- [CEC_LOG_ADDR_TYPE_AUDIOSYSTEM] = CEC_LOG_ADDR_MASK_AUDIOSYSTEM,
- [CEC_LOG_ADDR_TYPE_SPECIFIC] = CEC_LOG_ADDR_MASK_SPECIFIC,
- };
- struct cec_adapter *adap = arg;
- struct cec_log_addrs *las = &adap->log_addrs;
- int err;
- int i, j;
-
- mutex_lock(&adap->lock);
- dprintk(1, "physical address: %x.%x.%x.%x, claim %d logical addresses\n",
- cec_phys_addr_exp(adap->phys_addr), las->num_log_addrs);
- las->log_addr_mask = 0;
-
- if (las->log_addr_type[0] == CEC_LOG_ADDR_TYPE_UNREGISTERED)
- goto configured;
-
- for (i = 0; i < las->num_log_addrs; i++) {
- unsigned int type = las->log_addr_type[i];
- const u8 *la_list;
- u8 last_la;
-
- /*
- * The TV functionality can only map to physical address 0.
- * For any other address, try the Specific functionality
- * instead as per the spec.
- */
- if (adap->phys_addr && type == CEC_LOG_ADDR_TYPE_TV)
- type = CEC_LOG_ADDR_TYPE_SPECIFIC;
-
- la_list = type2addrs[type];
- last_la = las->log_addr[i];
- las->log_addr[i] = CEC_LOG_ADDR_INVALID;
- if (last_la == CEC_LOG_ADDR_INVALID ||
- last_la == CEC_LOG_ADDR_UNREGISTERED ||
- !((1 << last_la) & type2mask[type]))
- last_la = la_list[0];
-
- err = cec_config_log_addr(adap, i, last_la);
- if (err > 0) /* Reused last LA */
- continue;
-
- if (err < 0)
- goto unconfigure;
-
- for (j = 0; la_list[j] != CEC_LOG_ADDR_INVALID; j++) {
- /* Tried this one already, skip it */
- if (la_list[j] == last_la)
- continue;
- /* The backup addresses are CEC 2.0 specific */
- if ((la_list[j] == CEC_LOG_ADDR_BACKUP_1 ||
- la_list[j] == CEC_LOG_ADDR_BACKUP_2) &&
- las->cec_version < CEC_OP_CEC_VERSION_2_0)
- continue;
-
- err = cec_config_log_addr(adap, i, la_list[j]);
- if (err == 0) /* LA is in use */
- continue;
- if (err < 0)
- goto unconfigure;
- /* Done, claimed an LA */
- break;
- }
-
- if (la_list[j] == CEC_LOG_ADDR_INVALID)
- dprintk(1, "could not claim LA %d\n", i);
- }
-
- if (adap->log_addrs.log_addr_mask == 0 &&
- !(las->flags & CEC_LOG_ADDRS_FL_ALLOW_UNREG_FALLBACK))
- goto unconfigure;
-
-configured:
- if (adap->log_addrs.log_addr_mask == 0) {
- /* Fall back to unregistered */
- las->log_addr[0] = CEC_LOG_ADDR_UNREGISTERED;
- las->log_addr_mask = 1 << las->log_addr[0];
- for (i = 1; i < las->num_log_addrs; i++)
- las->log_addr[i] = CEC_LOG_ADDR_INVALID;
- }
- for (i = las->num_log_addrs; i < CEC_MAX_LOG_ADDRS; i++)
- las->log_addr[i] = CEC_LOG_ADDR_INVALID;
- adap->is_configured = true;
- adap->is_configuring = false;
- cec_post_state_event(adap);
-
- /*
- * Now post the Report Features and Report Physical Address broadcast
- * messages. Note that these are non-blocking transmits, meaning that
- * they are just queued up and once adap->lock is unlocked the main
- * thread will kick in and start transmitting these.
- *
- * If after this function is done (but before one or more of these
- * messages are actually transmitted) the CEC adapter is unconfigured,
- * then any remaining messages will be dropped by the main thread.
- */
- for (i = 0; i < las->num_log_addrs; i++) {
- struct cec_msg msg = {};
-
- if (las->log_addr[i] == CEC_LOG_ADDR_INVALID ||
- (las->flags & CEC_LOG_ADDRS_FL_CDC_ONLY))
- continue;
-
- msg.msg[0] = (las->log_addr[i] << 4) | 0x0f;
-
- /* Report Features must come first according to CEC 2.0 */
- if (las->log_addr[i] != CEC_LOG_ADDR_UNREGISTERED &&
- adap->log_addrs.cec_version >= CEC_OP_CEC_VERSION_2_0) {
- cec_fill_msg_report_features(adap, &msg, i);
- cec_transmit_msg_fh(adap, &msg, NULL, false);
- }
-
- /* Report Physical Address */
- cec_msg_report_physical_addr(&msg, adap->phys_addr,
- las->primary_device_type[i]);
- dprintk(1, "config: la %d pa %x.%x.%x.%x\n",
- las->log_addr[i],
- cec_phys_addr_exp(adap->phys_addr));
- cec_transmit_msg_fh(adap, &msg, NULL, false);
-
- /* Report Vendor ID */
- if (adap->log_addrs.vendor_id != CEC_VENDOR_ID_NONE) {
- cec_msg_device_vendor_id(&msg,
- adap->log_addrs.vendor_id);
- cec_transmit_msg_fh(adap, &msg, NULL, false);
- }
- }
- adap->kthread_config = NULL;
- complete(&adap->config_completion);
- mutex_unlock(&adap->lock);
- return 0;
-
-unconfigure:
- for (i = 0; i < las->num_log_addrs; i++)
- las->log_addr[i] = CEC_LOG_ADDR_INVALID;
- cec_adap_unconfigure(adap);
- adap->kthread_config = NULL;
- mutex_unlock(&adap->lock);
- complete(&adap->config_completion);
- return 0;
-}
-
-/*
- * Called from either __cec_s_phys_addr or __cec_s_log_addrs to claim the
- * logical addresses.
- *
- * This function is called with adap->lock held.
- */
-static void cec_claim_log_addrs(struct cec_adapter *adap, bool block)
-{
- if (WARN_ON(adap->is_configuring || adap->is_configured))
- return;
-
- init_completion(&adap->config_completion);
-
- /* Ready to kick off the thread */
- adap->is_configuring = true;
- adap->kthread_config = kthread_run(cec_config_thread_func, adap,
- "ceccfg-%s", adap->name);
- if (IS_ERR(adap->kthread_config)) {
- adap->kthread_config = NULL;
- } else if (block) {
- mutex_unlock(&adap->lock);
- wait_for_completion(&adap->config_completion);
- mutex_lock(&adap->lock);
- }
-}
-
-/* Set a new physical address and send an event notifying userspace of this.
- *
- * This function is called with adap->lock held.
- */
-void __cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block)
-{
- if (phys_addr == adap->phys_addr)
- return;
- if (phys_addr != CEC_PHYS_ADDR_INVALID && adap->devnode.unregistered)
- return;
-
- dprintk(1, "new physical address %x.%x.%x.%x\n",
- cec_phys_addr_exp(phys_addr));
- if (phys_addr == CEC_PHYS_ADDR_INVALID ||
- adap->phys_addr != CEC_PHYS_ADDR_INVALID) {
- adap->phys_addr = CEC_PHYS_ADDR_INVALID;
- cec_post_state_event(adap);
- cec_adap_unconfigure(adap);
- /* Disabling monitor all mode should always succeed */
- if (adap->monitor_all_cnt)
- WARN_ON(call_op(adap, adap_monitor_all_enable, false));
- mutex_lock(&adap->devnode.lock);
- if (adap->needs_hpd || list_empty(&adap->devnode.fhs)) {
- WARN_ON(adap->ops->adap_enable(adap, false));
- adap->transmit_in_progress = false;
- wake_up_interruptible(&adap->kthread_waitq);
- }
- mutex_unlock(&adap->devnode.lock);
- if (phys_addr == CEC_PHYS_ADDR_INVALID)
- return;
- }
-
- mutex_lock(&adap->devnode.lock);
- adap->last_initiator = 0xff;
- adap->transmit_in_progress = false;
-
- if ((adap->needs_hpd || list_empty(&adap->devnode.fhs)) &&
- adap->ops->adap_enable(adap, true)) {
- mutex_unlock(&adap->devnode.lock);
- return;
- }
-
- if (adap->monitor_all_cnt &&
- call_op(adap, adap_monitor_all_enable, true)) {
- if (adap->needs_hpd || list_empty(&adap->devnode.fhs))
- WARN_ON(adap->ops->adap_enable(adap, false));
- mutex_unlock(&adap->devnode.lock);
- return;
- }
- mutex_unlock(&adap->devnode.lock);
-
- adap->phys_addr = phys_addr;
- cec_post_state_event(adap);
- if (adap->log_addrs.num_log_addrs)
- cec_claim_log_addrs(adap, block);
-}
-
-void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block)
-{
- if (IS_ERR_OR_NULL(adap))
- return;
-
- mutex_lock(&adap->lock);
- __cec_s_phys_addr(adap, phys_addr, block);
- mutex_unlock(&adap->lock);
-}
-EXPORT_SYMBOL_GPL(cec_s_phys_addr);
-
-void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
- const struct edid *edid)
-{
- u16 pa = CEC_PHYS_ADDR_INVALID;
-
- if (edid && edid->extensions)
- pa = cec_get_edid_phys_addr((const u8 *)edid,
- EDID_LENGTH * (edid->extensions + 1), NULL);
- cec_s_phys_addr(adap, pa, false);
-}
-EXPORT_SYMBOL_GPL(cec_s_phys_addr_from_edid);
-
-void cec_s_conn_info(struct cec_adapter *adap,
- const struct cec_connector_info *conn_info)
-{
- if (IS_ERR_OR_NULL(adap))
- return;
-
- if (!(adap->capabilities & CEC_CAP_CONNECTOR_INFO))
- return;
-
- mutex_lock(&adap->lock);
- if (conn_info)
- adap->conn_info = *conn_info;
- else
- memset(&adap->conn_info, 0, sizeof(adap->conn_info));
- cec_post_state_event(adap);
- mutex_unlock(&adap->lock);
-}
-EXPORT_SYMBOL_GPL(cec_s_conn_info);
-
-/*
- * Called from either the ioctl or a driver to set the logical addresses.
- *
- * This function is called with adap->lock held.
- */
-int __cec_s_log_addrs(struct cec_adapter *adap,
- struct cec_log_addrs *log_addrs, bool block)
-{
- u16 type_mask = 0;
- int i;
-
- if (adap->devnode.unregistered)
- return -ENODEV;
-
- if (!log_addrs || log_addrs->num_log_addrs == 0) {
- cec_adap_unconfigure(adap);
- adap->log_addrs.num_log_addrs = 0;
- for (i = 0; i < CEC_MAX_LOG_ADDRS; i++)
- adap->log_addrs.log_addr[i] = CEC_LOG_ADDR_INVALID;
- adap->log_addrs.osd_name[0] = '\0';
- adap->log_addrs.vendor_id = CEC_VENDOR_ID_NONE;
- adap->log_addrs.cec_version = CEC_OP_CEC_VERSION_2_0;
- return 0;
- }
-
- if (log_addrs->flags & CEC_LOG_ADDRS_FL_CDC_ONLY) {
- /*
- * Sanitize log_addrs fields if a CDC-Only device is
- * requested.
- */
- log_addrs->num_log_addrs = 1;
- log_addrs->osd_name[0] = '\0';
- log_addrs->vendor_id = CEC_VENDOR_ID_NONE;
- log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_UNREGISTERED;
- /*
- * This is just an internal convention since a CDC-Only device
- * doesn't have to be a switch. But switches already use
- * unregistered, so it makes some kind of sense to pick this
- * as the primary device. Since a CDC-Only device never sends
- * any 'normal' CEC messages this primary device type is never
- * sent over the CEC bus.
- */
- log_addrs->primary_device_type[0] = CEC_OP_PRIM_DEVTYPE_SWITCH;
- log_addrs->all_device_types[0] = 0;
- log_addrs->features[0][0] = 0;
- log_addrs->features[0][1] = 0;
- }
-
- /* Ensure the osd name is 0-terminated */
- log_addrs->osd_name[sizeof(log_addrs->osd_name) - 1] = '\0';
-
- /* Sanity checks */
- if (log_addrs->num_log_addrs > adap->available_log_addrs) {
- dprintk(1, "num_log_addrs > %d\n", adap->available_log_addrs);
- return -EINVAL;
- }
-
- /*
- * Vendor ID is a 24 bit number, so check if the value is
- * within the correct range.
- */
- if (log_addrs->vendor_id != CEC_VENDOR_ID_NONE &&
- (log_addrs->vendor_id & 0xff000000) != 0) {
- dprintk(1, "invalid vendor ID\n");
- return -EINVAL;
- }
-
- if (log_addrs->cec_version != CEC_OP_CEC_VERSION_1_4 &&
- log_addrs->cec_version != CEC_OP_CEC_VERSION_2_0) {
- dprintk(1, "invalid CEC version\n");
- return -EINVAL;
- }
-
- if (log_addrs->num_log_addrs > 1)
- for (i = 0; i < log_addrs->num_log_addrs; i++)
- if (log_addrs->log_addr_type[i] ==
- CEC_LOG_ADDR_TYPE_UNREGISTERED) {
- dprintk(1, "num_log_addrs > 1 can't be combined with unregistered LA\n");
- return -EINVAL;
- }
-
- for (i = 0; i < log_addrs->num_log_addrs; i++) {
- const u8 feature_sz = ARRAY_SIZE(log_addrs->features[0]);
- u8 *features = log_addrs->features[i];
- bool op_is_dev_features = false;
- unsigned j;
-
- log_addrs->log_addr[i] = CEC_LOG_ADDR_INVALID;
- if (type_mask & (1 << log_addrs->log_addr_type[i])) {
- dprintk(1, "duplicate logical address type\n");
- return -EINVAL;
- }
- type_mask |= 1 << log_addrs->log_addr_type[i];
- if ((type_mask & (1 << CEC_LOG_ADDR_TYPE_RECORD)) &&
- (type_mask & (1 << CEC_LOG_ADDR_TYPE_PLAYBACK))) {
- /* Record already contains the playback functionality */
- dprintk(1, "invalid record + playback combination\n");
- return -EINVAL;
- }
- if (log_addrs->primary_device_type[i] >
- CEC_OP_PRIM_DEVTYPE_PROCESSOR) {
- dprintk(1, "unknown primary device type\n");
- return -EINVAL;
- }
- if (log_addrs->primary_device_type[i] == 2) {
- dprintk(1, "invalid primary device type\n");
- return -EINVAL;
- }
- if (log_addrs->log_addr_type[i] > CEC_LOG_ADDR_TYPE_UNREGISTERED) {
- dprintk(1, "unknown logical address type\n");
- return -EINVAL;
- }
- for (j = 0; j < feature_sz; j++) {
- if ((features[j] & 0x80) == 0) {
- if (op_is_dev_features)
- break;
- op_is_dev_features = true;
- }
- }
- if (!op_is_dev_features || j == feature_sz) {
- dprintk(1, "malformed features\n");
- return -EINVAL;
- }
- /* Zero unused part of the feature array */
- memset(features + j + 1, 0, feature_sz - j - 1);
- }
-
- if (log_addrs->cec_version >= CEC_OP_CEC_VERSION_2_0) {
- if (log_addrs->num_log_addrs > 2) {
- dprintk(1, "CEC 2.0 allows no more than 2 logical addresses\n");
- return -EINVAL;
- }
- if (log_addrs->num_log_addrs == 2) {
- if (!(type_mask & ((1 << CEC_LOG_ADDR_TYPE_AUDIOSYSTEM) |
- (1 << CEC_LOG_ADDR_TYPE_TV)))) {
- dprintk(1, "two LAs is only allowed for audiosystem and TV\n");
- return -EINVAL;
- }
- if (!(type_mask & ((1 << CEC_LOG_ADDR_TYPE_PLAYBACK) |
- (1 << CEC_LOG_ADDR_TYPE_RECORD)))) {
- dprintk(1, "an audiosystem/TV can only be combined with record or playback\n");
- return -EINVAL;
- }
- }
- }
-
- /* Zero unused LAs */
- for (i = log_addrs->num_log_addrs; i < CEC_MAX_LOG_ADDRS; i++) {
- log_addrs->primary_device_type[i] = 0;
- log_addrs->log_addr_type[i] = 0;
- log_addrs->all_device_types[i] = 0;
- memset(log_addrs->features[i], 0,
- sizeof(log_addrs->features[i]));
- }
-
- log_addrs->log_addr_mask = adap->log_addrs.log_addr_mask;
- adap->log_addrs = *log_addrs;
- if (adap->phys_addr != CEC_PHYS_ADDR_INVALID)
- cec_claim_log_addrs(adap, block);
- return 0;
-}
-
-int cec_s_log_addrs(struct cec_adapter *adap,
- struct cec_log_addrs *log_addrs, bool block)
-{
- int err;
-
- mutex_lock(&adap->lock);
- err = __cec_s_log_addrs(adap, log_addrs, block);
- mutex_unlock(&adap->lock);
- return err;
-}
-EXPORT_SYMBOL_GPL(cec_s_log_addrs);
-
-/* High-level core CEC message handling */
-
-/* Fill in the Report Features message */
-static void cec_fill_msg_report_features(struct cec_adapter *adap,
- struct cec_msg *msg,
- unsigned int la_idx)
-{
- const struct cec_log_addrs *las = &adap->log_addrs;
- const u8 *features = las->features[la_idx];
- bool op_is_dev_features = false;
- unsigned int idx;
-
- /* Report Features */
- msg->msg[0] = (las->log_addr[la_idx] << 4) | 0x0f;
- msg->len = 4;
- msg->msg[1] = CEC_MSG_REPORT_FEATURES;
- msg->msg[2] = adap->log_addrs.cec_version;
- msg->msg[3] = las->all_device_types[la_idx];
-
- /* Write RC Profiles first, then Device Features */
- for (idx = 0; idx < ARRAY_SIZE(las->features[0]); idx++) {
- msg->msg[msg->len++] = features[idx];
- if ((features[idx] & CEC_OP_FEAT_EXT) == 0) {
- if (op_is_dev_features)
- break;
- op_is_dev_features = true;
- }
- }
-}
-
-/* Transmit the Feature Abort message */
-static int cec_feature_abort_reason(struct cec_adapter *adap,
- struct cec_msg *msg, u8 reason)
-{
- struct cec_msg tx_msg = { };
-
- /*
- * Don't reply with CEC_MSG_FEATURE_ABORT to a CEC_MSG_FEATURE_ABORT
- * message!
- */
- if (msg->msg[1] == CEC_MSG_FEATURE_ABORT)
- return 0;
- /* Don't Feature Abort messages from 'Unregistered' */
- if (cec_msg_initiator(msg) == CEC_LOG_ADDR_UNREGISTERED)
- return 0;
- cec_msg_set_reply_to(&tx_msg, msg);
- cec_msg_feature_abort(&tx_msg, msg->msg[1], reason);
- return cec_transmit_msg(adap, &tx_msg, false);
-}
-
-static int cec_feature_abort(struct cec_adapter *adap, struct cec_msg *msg)
-{
- return cec_feature_abort_reason(adap, msg,
- CEC_OP_ABORT_UNRECOGNIZED_OP);
-}
-
-static int cec_feature_refused(struct cec_adapter *adap, struct cec_msg *msg)
-{
- return cec_feature_abort_reason(adap, msg,
- CEC_OP_ABORT_REFUSED);
-}
-
-/*
- * Called when a CEC message is received. This function will do any
- * necessary core processing. The is_reply bool is true if this message
- * is a reply to an earlier transmit.
- *
- * The message is either a broadcast message or a valid directed message.
- */
-static int cec_receive_notify(struct cec_adapter *adap, struct cec_msg *msg,
- bool is_reply)
-{
- bool is_broadcast = cec_msg_is_broadcast(msg);
- u8 dest_laddr = cec_msg_destination(msg);
- u8 init_laddr = cec_msg_initiator(msg);
- u8 devtype = cec_log_addr2dev(adap, dest_laddr);
- int la_idx = cec_log_addr2idx(adap, dest_laddr);
- bool from_unregistered = init_laddr == 0xf;
- struct cec_msg tx_cec_msg = { };
-
- dprintk(2, "%s: %*ph\n", __func__, msg->len, msg->msg);
-
- /* If this is a CDC-Only device, then ignore any non-CDC messages */
- if (cec_is_cdc_only(&adap->log_addrs) &&
- msg->msg[1] != CEC_MSG_CDC_MESSAGE)
- return 0;
-
- if (adap->ops->received) {
- /* Allow drivers to process the message first */
- if (adap->ops->received(adap, msg) != -ENOMSG)
- return 0;
- }
-
- /*
- * REPORT_PHYSICAL_ADDR, CEC_MSG_USER_CONTROL_PRESSED and
- * CEC_MSG_USER_CONTROL_RELEASED messages always have to be
- * handled by the CEC core, even if the passthrough mode is on.
- * The others are just ignored if passthrough mode is on.
- */
- switch (msg->msg[1]) {
- case CEC_MSG_GET_CEC_VERSION:
- case CEC_MSG_ABORT:
- case CEC_MSG_GIVE_DEVICE_POWER_STATUS:
- case CEC_MSG_GIVE_OSD_NAME:
- /*
- * These messages reply with a directed message, so ignore if
- * the initiator is Unregistered.
- */
- if (!adap->passthrough && from_unregistered)
- return 0;
- /* Fall through */
- case CEC_MSG_GIVE_DEVICE_VENDOR_ID:
- case CEC_MSG_GIVE_FEATURES:
- case CEC_MSG_GIVE_PHYSICAL_ADDR:
- /*
- * Skip processing these messages if the passthrough mode
- * is on.
- */
- if (adap->passthrough)
- goto skip_processing;
- /* Ignore if addressing is wrong */
- if (is_broadcast)
- return 0;
- break;
-
- case CEC_MSG_USER_CONTROL_PRESSED:
- case CEC_MSG_USER_CONTROL_RELEASED:
- /* Wrong addressing mode: don't process */
- if (is_broadcast || from_unregistered)
- goto skip_processing;
- break;
-
- case CEC_MSG_REPORT_PHYSICAL_ADDR:
- /*
- * This message is always processed, regardless of the
- * passthrough setting.
- *
- * Exception: don't process if wrong addressing mode.
- */
- if (!is_broadcast)
- goto skip_processing;
- break;
-
- default:
- break;
- }
-
- cec_msg_set_reply_to(&tx_cec_msg, msg);
-
- switch (msg->msg[1]) {
- /* The following messages are processed but still passed through */
- case CEC_MSG_REPORT_PHYSICAL_ADDR: {
- u16 pa = (msg->msg[2] << 8) | msg->msg[3];
-
- if (!from_unregistered)
- adap->phys_addrs[init_laddr] = pa;
- dprintk(1, "reported physical address %x.%x.%x.%x for logical address %d\n",
- cec_phys_addr_exp(pa), init_laddr);
- break;
- }
-
- case CEC_MSG_USER_CONTROL_PRESSED:
- if (!(adap->capabilities & CEC_CAP_RC) ||
- !(adap->log_addrs.flags & CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU))
- break;
-
-#ifdef CONFIG_MEDIA_CEC_RC
- switch (msg->msg[2]) {
- /*
- * Play function, this message can have variable length
- * depending on the specific play function that is used.
- */
- case CEC_OP_UI_CMD_PLAY_FUNCTION:
- if (msg->len == 2)
- rc_keydown(adap->rc, RC_PROTO_CEC,
- msg->msg[2], 0);
- else
- rc_keydown(adap->rc, RC_PROTO_CEC,
- msg->msg[2] << 8 | msg->msg[3], 0);
- break;
- /*
- * Other function messages that are not handled.
- * Currently the RC framework does not allow to supply an
- * additional parameter to a keypress. These "keys" contain
- * other information such as channel number, an input number
- * etc.
- * For the time being these messages are not processed by the
- * framework and are simply forwarded to the user space.
- */
- case CEC_OP_UI_CMD_SELECT_BROADCAST_TYPE:
- case CEC_OP_UI_CMD_SELECT_SOUND_PRESENTATION:
- case CEC_OP_UI_CMD_TUNE_FUNCTION:
- case CEC_OP_UI_CMD_SELECT_MEDIA_FUNCTION:
- case CEC_OP_UI_CMD_SELECT_AV_INPUT_FUNCTION:
- case CEC_OP_UI_CMD_SELECT_AUDIO_INPUT_FUNCTION:
- break;
- default:
- rc_keydown(adap->rc, RC_PROTO_CEC, msg->msg[2], 0);
- break;
- }
-#endif
- break;
-
- case CEC_MSG_USER_CONTROL_RELEASED:
- if (!(adap->capabilities & CEC_CAP_RC) ||
- !(adap->log_addrs.flags & CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU))
- break;
-#ifdef CONFIG_MEDIA_CEC_RC
- rc_keyup(adap->rc);
-#endif
- break;
-
- /*
- * The remaining messages are only processed if the passthrough mode
- * is off.
- */
- case CEC_MSG_GET_CEC_VERSION:
- cec_msg_cec_version(&tx_cec_msg, adap->log_addrs.cec_version);
- return cec_transmit_msg(adap, &tx_cec_msg, false);
-
- case CEC_MSG_GIVE_PHYSICAL_ADDR:
- /* Do nothing for CEC switches using addr 15 */
- if (devtype == CEC_OP_PRIM_DEVTYPE_SWITCH && dest_laddr == 15)
- return 0;
- cec_msg_report_physical_addr(&tx_cec_msg, adap->phys_addr, devtype);
- return cec_transmit_msg(adap, &tx_cec_msg, false);
-
- case CEC_MSG_GIVE_DEVICE_VENDOR_ID:
- if (adap->log_addrs.vendor_id == CEC_VENDOR_ID_NONE)
- return cec_feature_abort(adap, msg);
- cec_msg_device_vendor_id(&tx_cec_msg, adap->log_addrs.vendor_id);
- return cec_transmit_msg(adap, &tx_cec_msg, false);
-
- case CEC_MSG_ABORT:
- /* Do nothing for CEC switches */
- if (devtype == CEC_OP_PRIM_DEVTYPE_SWITCH)
- return 0;
- return cec_feature_refused(adap, msg);
-
- case CEC_MSG_GIVE_OSD_NAME: {
- if (adap->log_addrs.osd_name[0] == 0)
- return cec_feature_abort(adap, msg);
- cec_msg_set_osd_name(&tx_cec_msg, adap->log_addrs.osd_name);
- return cec_transmit_msg(adap, &tx_cec_msg, false);
- }
-
- case CEC_MSG_GIVE_FEATURES:
- if (adap->log_addrs.cec_version < CEC_OP_CEC_VERSION_2_0)
- return cec_feature_abort(adap, msg);
- cec_fill_msg_report_features(adap, &tx_cec_msg, la_idx);
- return cec_transmit_msg(adap, &tx_cec_msg, false);
-
- default:
- /*
- * Unprocessed messages are aborted if userspace isn't doing
- * any processing either.
- */
- if (!is_broadcast && !is_reply && !adap->follower_cnt &&
- !adap->cec_follower && msg->msg[1] != CEC_MSG_FEATURE_ABORT)
- return cec_feature_abort(adap, msg);
- break;
- }
-
-skip_processing:
- /* If this was a reply, then we're done, unless otherwise specified */
- if (is_reply && !(msg->flags & CEC_MSG_FL_REPLY_TO_FOLLOWERS))
- return 0;
-
- /*
- * Send to the exclusive follower if there is one, otherwise send
- * to all followers.
- */
- if (adap->cec_follower)
- cec_queue_msg_fh(adap->cec_follower, msg);
- else
- cec_queue_msg_followers(adap, msg);
- return 0;
-}
-
-/*
- * Helper functions to keep track of the 'monitor all' use count.
- *
- * These functions are called with adap->lock held.
- */
-int cec_monitor_all_cnt_inc(struct cec_adapter *adap)
-{
- int ret = 0;
-
- if (adap->monitor_all_cnt == 0)
- ret = call_op(adap, adap_monitor_all_enable, 1);
- if (ret == 0)
- adap->monitor_all_cnt++;
- return ret;
-}
-
-void cec_monitor_all_cnt_dec(struct cec_adapter *adap)
-{
- adap->monitor_all_cnt--;
- if (adap->monitor_all_cnt == 0)
- WARN_ON(call_op(adap, adap_monitor_all_enable, 0));
-}
-
-/*
- * Helper functions to keep track of the 'monitor pin' use count.
- *
- * These functions are called with adap->lock held.
- */
-int cec_monitor_pin_cnt_inc(struct cec_adapter *adap)
-{
- int ret = 0;
-
- if (adap->monitor_pin_cnt == 0)
- ret = call_op(adap, adap_monitor_pin_enable, 1);
- if (ret == 0)
- adap->monitor_pin_cnt++;
- return ret;
-}
-
-void cec_monitor_pin_cnt_dec(struct cec_adapter *adap)
-{
- adap->monitor_pin_cnt--;
- if (adap->monitor_pin_cnt == 0)
- WARN_ON(call_op(adap, adap_monitor_pin_enable, 0));
-}
-
-#ifdef CONFIG_DEBUG_FS
-/*
- * Log the current state of the CEC adapter.
- * Very useful for debugging.
- */
-int cec_adap_status(struct seq_file *file, void *priv)
-{
- struct cec_adapter *adap = dev_get_drvdata(file->private);
- struct cec_data *data;
-
- mutex_lock(&adap->lock);
- seq_printf(file, "configured: %d\n", adap->is_configured);
- seq_printf(file, "configuring: %d\n", adap->is_configuring);
- seq_printf(file, "phys_addr: %x.%x.%x.%x\n",
- cec_phys_addr_exp(adap->phys_addr));
- seq_printf(file, "number of LAs: %d\n", adap->log_addrs.num_log_addrs);
- seq_printf(file, "LA mask: 0x%04x\n", adap->log_addrs.log_addr_mask);
- if (adap->cec_follower)
- seq_printf(file, "has CEC follower%s\n",
- adap->passthrough ? " (in passthrough mode)" : "");
- if (adap->cec_initiator)
- seq_puts(file, "has CEC initiator\n");
- if (adap->monitor_all_cnt)
- seq_printf(file, "file handles in Monitor All mode: %u\n",
- adap->monitor_all_cnt);
- if (adap->tx_timeouts) {
- seq_printf(file, "transmit timeouts: %u\n",
- adap->tx_timeouts);
- adap->tx_timeouts = 0;
- }
- data = adap->transmitting;
- if (data)
- seq_printf(file, "transmitting message: %*ph (reply: %02x, timeout: %ums)\n",
- data->msg.len, data->msg.msg, data->msg.reply,
- data->msg.timeout);
- seq_printf(file, "pending transmits: %u\n", adap->transmit_queue_sz);
- list_for_each_entry(data, &adap->transmit_queue, list) {
- seq_printf(file, "queued tx message: %*ph (reply: %02x, timeout: %ums)\n",
- data->msg.len, data->msg.msg, data->msg.reply,
- data->msg.timeout);
- }
- list_for_each_entry(data, &adap->wait_queue, list) {
- seq_printf(file, "message waiting for reply: %*ph (reply: %02x, timeout: %ums)\n",
- data->msg.len, data->msg.msg, data->msg.reply,
- data->msg.timeout);
- }
-
- call_void_op(adap, adap_status, file);
- mutex_unlock(&adap->lock);
- return 0;
-}
-#endif
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * cec-api.c - HDMI Consumer Electronics Control framework - API
- *
- * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
- */
-
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/kmod.h>
-#include <linux/ktime.h>
-#include <linux/slab.h>
-#include <linux/mm.h>
-#include <linux/string.h>
-#include <linux/types.h>
-#include <linux/uaccess.h>
-#include <linux/version.h>
-
-#include <media/cec-pin.h>
-#include "cec-priv.h"
-#include "cec-pin-priv.h"
-
-static inline struct cec_devnode *cec_devnode_data(struct file *filp)
-{
- struct cec_fh *fh = filp->private_data;
-
- return &fh->adap->devnode;
-}
-
-/* CEC file operations */
-
-static __poll_t cec_poll(struct file *filp,
- struct poll_table_struct *poll)
-{
- struct cec_fh *fh = filp->private_data;
- struct cec_adapter *adap = fh->adap;
- __poll_t res = 0;
-
- poll_wait(filp, &fh->wait, poll);
- if (!cec_is_registered(adap))
- return EPOLLERR | EPOLLHUP;
- mutex_lock(&adap->lock);
- if (adap->is_configured &&
- adap->transmit_queue_sz < CEC_MAX_MSG_TX_QUEUE_SZ)
- res |= EPOLLOUT | EPOLLWRNORM;
- if (fh->queued_msgs)
- res |= EPOLLIN | EPOLLRDNORM;
- if (fh->total_queued_events)
- res |= EPOLLPRI;
- mutex_unlock(&adap->lock);
- return res;
-}
-
-static bool cec_is_busy(const struct cec_adapter *adap,
- const struct cec_fh *fh)
-{
- bool valid_initiator = adap->cec_initiator && adap->cec_initiator == fh;
- bool valid_follower = adap->cec_follower && adap->cec_follower == fh;
-
- /*
- * Exclusive initiators and followers can always access the CEC adapter
- */
- if (valid_initiator || valid_follower)
- return false;
- /*
- * All others can only access the CEC adapter if there is no
- * exclusive initiator and they are in INITIATOR mode.
- */
- return adap->cec_initiator ||
- fh->mode_initiator == CEC_MODE_NO_INITIATOR;
-}
-
-static long cec_adap_g_caps(struct cec_adapter *adap,
- struct cec_caps __user *parg)
-{
- struct cec_caps caps = {};
-
- strscpy(caps.driver, adap->devnode.dev.parent->driver->name,
- sizeof(caps.driver));
- strscpy(caps.name, adap->name, sizeof(caps.name));
- caps.available_log_addrs = adap->available_log_addrs;
- caps.capabilities = adap->capabilities;
- caps.version = LINUX_VERSION_CODE;
- if (copy_to_user(parg, &caps, sizeof(caps)))
- return -EFAULT;
- return 0;
-}
-
-static long cec_adap_g_phys_addr(struct cec_adapter *adap,
- __u16 __user *parg)
-{
- u16 phys_addr;
-
- mutex_lock(&adap->lock);
- phys_addr = adap->phys_addr;
- mutex_unlock(&adap->lock);
- if (copy_to_user(parg, &phys_addr, sizeof(phys_addr)))
- return -EFAULT;
- return 0;
-}
-
-static int cec_validate_phys_addr(u16 phys_addr)
-{
- int i;
-
- if (phys_addr == CEC_PHYS_ADDR_INVALID)
- return 0;
- for (i = 0; i < 16; i += 4)
- if (phys_addr & (0xf << i))
- break;
- if (i == 16)
- return 0;
- for (i += 4; i < 16; i += 4)
- if ((phys_addr & (0xf << i)) == 0)
- return -EINVAL;
- return 0;
-}
-
-static long cec_adap_s_phys_addr(struct cec_adapter *adap, struct cec_fh *fh,
- bool block, __u16 __user *parg)
-{
- u16 phys_addr;
- long err;
-
- if (!(adap->capabilities & CEC_CAP_PHYS_ADDR))
- return -ENOTTY;
- if (copy_from_user(&phys_addr, parg, sizeof(phys_addr)))
- return -EFAULT;
-
- err = cec_validate_phys_addr(phys_addr);
- if (err)
- return err;
- mutex_lock(&adap->lock);
- if (cec_is_busy(adap, fh))
- err = -EBUSY;
- else
- __cec_s_phys_addr(adap, phys_addr, block);
- mutex_unlock(&adap->lock);
- return err;
-}
-
-static long cec_adap_g_log_addrs(struct cec_adapter *adap,
- struct cec_log_addrs __user *parg)
-{
- struct cec_log_addrs log_addrs;
-
- mutex_lock(&adap->lock);
- log_addrs = adap->log_addrs;
- if (!adap->is_configured)
- memset(log_addrs.log_addr, CEC_LOG_ADDR_INVALID,
- sizeof(log_addrs.log_addr));
- mutex_unlock(&adap->lock);
-
- if (copy_to_user(parg, &log_addrs, sizeof(log_addrs)))
- return -EFAULT;
- return 0;
-}
-
-static long cec_adap_s_log_addrs(struct cec_adapter *adap, struct cec_fh *fh,
- bool block, struct cec_log_addrs __user *parg)
-{
- struct cec_log_addrs log_addrs;
- long err = -EBUSY;
-
- if (!(adap->capabilities & CEC_CAP_LOG_ADDRS))
- return -ENOTTY;
- if (copy_from_user(&log_addrs, parg, sizeof(log_addrs)))
- return -EFAULT;
- log_addrs.flags &= CEC_LOG_ADDRS_FL_ALLOW_UNREG_FALLBACK |
- CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU |
- CEC_LOG_ADDRS_FL_CDC_ONLY;
- mutex_lock(&adap->lock);
- if (!adap->is_configuring &&
- (!log_addrs.num_log_addrs || !adap->is_configured) &&
- !cec_is_busy(adap, fh)) {
- err = __cec_s_log_addrs(adap, &log_addrs, block);
- if (!err)
- log_addrs = adap->log_addrs;
- }
- mutex_unlock(&adap->lock);
- if (err)
- return err;
- if (copy_to_user(parg, &log_addrs, sizeof(log_addrs)))
- return -EFAULT;
- return 0;
-}
-
-static long cec_adap_g_connector_info(struct cec_adapter *adap,
- struct cec_log_addrs __user *parg)
-{
- int ret = 0;
-
- if (!(adap->capabilities & CEC_CAP_CONNECTOR_INFO))
- return -ENOTTY;
-
- mutex_lock(&adap->lock);
- if (copy_to_user(parg, &adap->conn_info, sizeof(adap->conn_info)))
- ret = -EFAULT;
- mutex_unlock(&adap->lock);
- return ret;
-}
-
-static long cec_transmit(struct cec_adapter *adap, struct cec_fh *fh,
- bool block, struct cec_msg __user *parg)
-{
- struct cec_msg msg = {};
- long err = 0;
-
- if (!(adap->capabilities & CEC_CAP_TRANSMIT))
- return -ENOTTY;
- if (copy_from_user(&msg, parg, sizeof(msg)))
- return -EFAULT;
-
- mutex_lock(&adap->lock);
- if (adap->log_addrs.num_log_addrs == 0)
- err = -EPERM;
- else if (adap->is_configuring)
- err = -ENONET;
- else if (cec_is_busy(adap, fh))
- err = -EBUSY;
- else
- err = cec_transmit_msg_fh(adap, &msg, fh, block);
- mutex_unlock(&adap->lock);
- if (err)
- return err;
- if (copy_to_user(parg, &msg, sizeof(msg)))
- return -EFAULT;
- return 0;
-}
-
-/* Called by CEC_RECEIVE: wait for a message to arrive */
-static int cec_receive_msg(struct cec_fh *fh, struct cec_msg *msg, bool block)
-{
- u32 timeout = msg->timeout;
- int res;
-
- do {
- mutex_lock(&fh->lock);
- /* Are there received messages queued up? */
- if (fh->queued_msgs) {
- /* Yes, return the first one */
- struct cec_msg_entry *entry =
- list_first_entry(&fh->msgs,
- struct cec_msg_entry, list);
-
- list_del(&entry->list);
- *msg = entry->msg;
- kfree(entry);
- fh->queued_msgs--;
- mutex_unlock(&fh->lock);
- /* restore original timeout value */
- msg->timeout = timeout;
- return 0;
- }
-
- /* No, return EAGAIN in non-blocking mode or wait */
- mutex_unlock(&fh->lock);
-
- /* Return when in non-blocking mode */
- if (!block)
- return -EAGAIN;
-
- if (msg->timeout) {
- /* The user specified a timeout */
- res = wait_event_interruptible_timeout(fh->wait,
- fh->queued_msgs,
- msecs_to_jiffies(msg->timeout));
- if (res == 0)
- res = -ETIMEDOUT;
- else if (res > 0)
- res = 0;
- } else {
- /* Wait indefinitely */
- res = wait_event_interruptible(fh->wait,
- fh->queued_msgs);
- }
- /* Exit on error, otherwise loop to get the new message */
- } while (!res);
- return res;
-}
-
-static long cec_receive(struct cec_adapter *adap, struct cec_fh *fh,
- bool block, struct cec_msg __user *parg)
-{
- struct cec_msg msg = {};
- long err;
-
- if (copy_from_user(&msg, parg, sizeof(msg)))
- return -EFAULT;
-
- err = cec_receive_msg(fh, &msg, block);
- if (err)
- return err;
- msg.flags = 0;
- if (copy_to_user(parg, &msg, sizeof(msg)))
- return -EFAULT;
- return 0;
-}
-
-static long cec_dqevent(struct cec_adapter *adap, struct cec_fh *fh,
- bool block, struct cec_event __user *parg)
-{
- struct cec_event_entry *ev = NULL;
- u64 ts = ~0ULL;
- unsigned int i;
- unsigned int ev_idx;
- long err = 0;
-
- mutex_lock(&fh->lock);
- while (!fh->total_queued_events && block) {
- mutex_unlock(&fh->lock);
- err = wait_event_interruptible(fh->wait,
- fh->total_queued_events);
- if (err)
- return err;
- mutex_lock(&fh->lock);
- }
-
- /* Find the oldest event */
- for (i = 0; i < CEC_NUM_EVENTS; i++) {
- struct cec_event_entry *entry =
- list_first_entry_or_null(&fh->events[i],
- struct cec_event_entry, list);
-
- if (entry && entry->ev.ts <= ts) {
- ev = entry;
- ev_idx = i;
- ts = ev->ev.ts;
- }
- }
-
- if (!ev) {
- err = -EAGAIN;
- goto unlock;
- }
- list_del(&ev->list);
-
- if (copy_to_user(parg, &ev->ev, sizeof(ev->ev)))
- err = -EFAULT;
- if (ev_idx >= CEC_NUM_CORE_EVENTS)
- kfree(ev);
- fh->queued_events[ev_idx]--;
- fh->total_queued_events--;
-
-unlock:
- mutex_unlock(&fh->lock);
- return err;
-}
-
-static long cec_g_mode(struct cec_adapter *adap, struct cec_fh *fh,
- u32 __user *parg)
-{
- u32 mode = fh->mode_initiator | fh->mode_follower;
-
- if (copy_to_user(parg, &mode, sizeof(mode)))
- return -EFAULT;
- return 0;
-}
-
-static long cec_s_mode(struct cec_adapter *adap, struct cec_fh *fh,
- u32 __user *parg)
-{
- u32 mode;
- u8 mode_initiator;
- u8 mode_follower;
- bool send_pin_event = false;
- long err = 0;
-
- if (copy_from_user(&mode, parg, sizeof(mode)))
- return -EFAULT;
- if (mode & ~(CEC_MODE_INITIATOR_MSK | CEC_MODE_FOLLOWER_MSK)) {
- dprintk(1, "%s: invalid mode bits set\n", __func__);
- return -EINVAL;
- }
-
- mode_initiator = mode & CEC_MODE_INITIATOR_MSK;
- mode_follower = mode & CEC_MODE_FOLLOWER_MSK;
-
- if (mode_initiator > CEC_MODE_EXCL_INITIATOR ||
- mode_follower > CEC_MODE_MONITOR_ALL) {
- dprintk(1, "%s: unknown mode\n", __func__);
- return -EINVAL;
- }
-
- if (mode_follower == CEC_MODE_MONITOR_ALL &&
- !(adap->capabilities & CEC_CAP_MONITOR_ALL)) {
- dprintk(1, "%s: MONITOR_ALL not supported\n", __func__);
- return -EINVAL;
- }
-
- if (mode_follower == CEC_MODE_MONITOR_PIN &&
- !(adap->capabilities & CEC_CAP_MONITOR_PIN)) {
- dprintk(1, "%s: MONITOR_PIN not supported\n", __func__);
- return -EINVAL;
- }
-
- /* Follower modes should always be able to send CEC messages */
- if ((mode_initiator == CEC_MODE_NO_INITIATOR ||
- !(adap->capabilities & CEC_CAP_TRANSMIT)) &&
- mode_follower >= CEC_MODE_FOLLOWER &&
- mode_follower <= CEC_MODE_EXCL_FOLLOWER_PASSTHRU) {
- dprintk(1, "%s: cannot transmit\n", __func__);
- return -EINVAL;
- }
-
- /* Monitor modes require CEC_MODE_NO_INITIATOR */
- if (mode_initiator && mode_follower >= CEC_MODE_MONITOR_PIN) {
- dprintk(1, "%s: monitor modes require NO_INITIATOR\n",
- __func__);
- return -EINVAL;
- }
-
- /* Monitor modes require CAP_NET_ADMIN */
- if (mode_follower >= CEC_MODE_MONITOR_PIN && !capable(CAP_NET_ADMIN))
- return -EPERM;
-
- mutex_lock(&adap->lock);
- /*
- * You can't become exclusive follower if someone else already
- * has that job.
- */
- if ((mode_follower == CEC_MODE_EXCL_FOLLOWER ||
- mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU) &&
- adap->cec_follower && adap->cec_follower != fh)
- err = -EBUSY;
- /*
- * You can't become exclusive initiator if someone else already
- * has that job.
- */
- if (mode_initiator == CEC_MODE_EXCL_INITIATOR &&
- adap->cec_initiator && adap->cec_initiator != fh)
- err = -EBUSY;
-
- if (!err) {
- bool old_mon_all = fh->mode_follower == CEC_MODE_MONITOR_ALL;
- bool new_mon_all = mode_follower == CEC_MODE_MONITOR_ALL;
-
- if (old_mon_all != new_mon_all) {
- if (new_mon_all)
- err = cec_monitor_all_cnt_inc(adap);
- else
- cec_monitor_all_cnt_dec(adap);
- }
- }
-
- if (!err) {
- bool old_mon_pin = fh->mode_follower == CEC_MODE_MONITOR_PIN;
- bool new_mon_pin = mode_follower == CEC_MODE_MONITOR_PIN;
-
- if (old_mon_pin != new_mon_pin) {
- send_pin_event = new_mon_pin;
- if (new_mon_pin)
- err = cec_monitor_pin_cnt_inc(adap);
- else
- cec_monitor_pin_cnt_dec(adap);
- }
- }
-
- if (err) {
- mutex_unlock(&adap->lock);
- return err;
- }
-
- if (fh->mode_follower == CEC_MODE_FOLLOWER)
- adap->follower_cnt--;
- if (mode_follower == CEC_MODE_FOLLOWER)
- adap->follower_cnt++;
- if (send_pin_event) {
- struct cec_event ev = {
- .flags = CEC_EVENT_FL_INITIAL_STATE,
- };
-
- ev.event = adap->cec_pin_is_high ? CEC_EVENT_PIN_CEC_HIGH :
- CEC_EVENT_PIN_CEC_LOW;
- cec_queue_event_fh(fh, &ev, 0);
- }
- if (mode_follower == CEC_MODE_EXCL_FOLLOWER ||
- mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU) {
- adap->passthrough =
- mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU;
- adap->cec_follower = fh;
- } else if (adap->cec_follower == fh) {
- adap->passthrough = false;
- adap->cec_follower = NULL;
- }
- if (mode_initiator == CEC_MODE_EXCL_INITIATOR)
- adap->cec_initiator = fh;
- else if (adap->cec_initiator == fh)
- adap->cec_initiator = NULL;
- fh->mode_initiator = mode_initiator;
- fh->mode_follower = mode_follower;
- mutex_unlock(&adap->lock);
- return 0;
-}
-
-static long cec_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
-{
- struct cec_fh *fh = filp->private_data;
- struct cec_adapter *adap = fh->adap;
- bool block = !(filp->f_flags & O_NONBLOCK);
- void __user *parg = (void __user *)arg;
-
- if (!cec_is_registered(adap))
- return -ENODEV;
-
- switch (cmd) {
- case CEC_ADAP_G_CAPS:
- return cec_adap_g_caps(adap, parg);
-
- case CEC_ADAP_G_PHYS_ADDR:
- return cec_adap_g_phys_addr(adap, parg);
-
- case CEC_ADAP_S_PHYS_ADDR:
- return cec_adap_s_phys_addr(adap, fh, block, parg);
-
- case CEC_ADAP_G_LOG_ADDRS:
- return cec_adap_g_log_addrs(adap, parg);
-
- case CEC_ADAP_S_LOG_ADDRS:
- return cec_adap_s_log_addrs(adap, fh, block, parg);
-
- case CEC_ADAP_G_CONNECTOR_INFO:
- return cec_adap_g_connector_info(adap, parg);
-
- case CEC_TRANSMIT:
- return cec_transmit(adap, fh, block, parg);
-
- case CEC_RECEIVE:
- return cec_receive(adap, fh, block, parg);
-
- case CEC_DQEVENT:
- return cec_dqevent(adap, fh, block, parg);
-
- case CEC_G_MODE:
- return cec_g_mode(adap, fh, parg);
-
- case CEC_S_MODE:
- return cec_s_mode(adap, fh, parg);
-
- default:
- return -ENOTTY;
- }
-}
-
-static int cec_open(struct inode *inode, struct file *filp)
-{
- struct cec_devnode *devnode =
- container_of(inode->i_cdev, struct cec_devnode, cdev);
- struct cec_adapter *adap = to_cec_adapter(devnode);
- struct cec_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL);
- /*
- * Initial events that are automatically sent when the cec device is
- * opened.
- */
- struct cec_event ev = {
- .event = CEC_EVENT_STATE_CHANGE,
- .flags = CEC_EVENT_FL_INITIAL_STATE,
- };
- unsigned int i;
- int err;
-
- if (!fh)
- return -ENOMEM;
-
- INIT_LIST_HEAD(&fh->msgs);
- INIT_LIST_HEAD(&fh->xfer_list);
- for (i = 0; i < CEC_NUM_EVENTS; i++)
- INIT_LIST_HEAD(&fh->events[i]);
- mutex_init(&fh->lock);
- init_waitqueue_head(&fh->wait);
-
- fh->mode_initiator = CEC_MODE_INITIATOR;
- fh->adap = adap;
-
- err = cec_get_device(devnode);
- if (err) {
- kfree(fh);
- return err;
- }
-
- mutex_lock(&devnode->lock);
- if (list_empty(&devnode->fhs) &&
- !adap->needs_hpd &&
- adap->phys_addr == CEC_PHYS_ADDR_INVALID) {
- err = adap->ops->adap_enable(adap, true);
- if (err) {
- mutex_unlock(&devnode->lock);
- kfree(fh);
- return err;
- }
- }
- filp->private_data = fh;
-
- /* Queue up initial state events */
- ev.state_change.phys_addr = adap->phys_addr;
- ev.state_change.log_addr_mask = adap->log_addrs.log_addr_mask;
- ev.state_change.have_conn_info =
- adap->conn_info.type != CEC_CONNECTOR_TYPE_NO_CONNECTOR;
- cec_queue_event_fh(fh, &ev, 0);
-#ifdef CONFIG_CEC_PIN
- if (adap->pin && adap->pin->ops->read_hpd) {
- err = adap->pin->ops->read_hpd(adap);
- if (err >= 0) {
- ev.event = err ? CEC_EVENT_PIN_HPD_HIGH :
- CEC_EVENT_PIN_HPD_LOW;
- cec_queue_event_fh(fh, &ev, 0);
- }
- }
- if (adap->pin && adap->pin->ops->read_5v) {
- err = adap->pin->ops->read_5v(adap);
- if (err >= 0) {
- ev.event = err ? CEC_EVENT_PIN_5V_HIGH :
- CEC_EVENT_PIN_5V_LOW;
- cec_queue_event_fh(fh, &ev, 0);
- }
- }
-#endif
-
- list_add(&fh->list, &devnode->fhs);
- mutex_unlock(&devnode->lock);
-
- return 0;
-}
-
-/* Override for the release function */
-static int cec_release(struct inode *inode, struct file *filp)
-{
- struct cec_devnode *devnode = cec_devnode_data(filp);
- struct cec_adapter *adap = to_cec_adapter(devnode);
- struct cec_fh *fh = filp->private_data;
- unsigned int i;
-
- mutex_lock(&adap->lock);
- if (adap->cec_initiator == fh)
- adap->cec_initiator = NULL;
- if (adap->cec_follower == fh) {
- adap->cec_follower = NULL;
- adap->passthrough = false;
- }
- if (fh->mode_follower == CEC_MODE_FOLLOWER)
- adap->follower_cnt--;
- if (fh->mode_follower == CEC_MODE_MONITOR_PIN)
- cec_monitor_pin_cnt_dec(adap);
- if (fh->mode_follower == CEC_MODE_MONITOR_ALL)
- cec_monitor_all_cnt_dec(adap);
- mutex_unlock(&adap->lock);
-
- mutex_lock(&devnode->lock);
- list_del(&fh->list);
- if (cec_is_registered(adap) && list_empty(&devnode->fhs) &&
- !adap->needs_hpd && adap->phys_addr == CEC_PHYS_ADDR_INVALID) {
- WARN_ON(adap->ops->adap_enable(adap, false));
- }
- mutex_unlock(&devnode->lock);
-
- /* Unhook pending transmits from this filehandle. */
- mutex_lock(&adap->lock);
- while (!list_empty(&fh->xfer_list)) {
- struct cec_data *data =
- list_first_entry(&fh->xfer_list, struct cec_data, xfer_list);
-
- data->blocking = false;
- data->fh = NULL;
- list_del(&data->xfer_list);
- }
- mutex_unlock(&adap->lock);
- while (!list_empty(&fh->msgs)) {
- struct cec_msg_entry *entry =
- list_first_entry(&fh->msgs, struct cec_msg_entry, list);
-
- list_del(&entry->list);
- kfree(entry);
- }
- for (i = CEC_NUM_CORE_EVENTS; i < CEC_NUM_EVENTS; i++) {
- while (!list_empty(&fh->events[i])) {
- struct cec_event_entry *entry =
- list_first_entry(&fh->events[i],
- struct cec_event_entry, list);
-
- list_del(&entry->list);
- kfree(entry);
- }
- }
- kfree(fh);
-
- cec_put_device(devnode);
- filp->private_data = NULL;
- return 0;
-}
-
-const struct file_operations cec_devnode_fops = {
- .owner = THIS_MODULE,
- .open = cec_open,
- .unlocked_ioctl = cec_ioctl,
- .compat_ioctl = cec_ioctl,
- .release = cec_release,
- .poll = cec_poll,
- .llseek = no_llseek,
-};
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * cec-core.c - HDMI Consumer Electronics Control framework - Core
- *
- * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
- */
-
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/kmod.h>
-#include <linux/slab.h>
-#include <linux/mm.h>
-#include <linux/string.h>
-#include <linux/types.h>
-
-#include "cec-priv.h"
-
-#define CEC_NUM_DEVICES 256
-#define CEC_NAME "cec"
-
-int cec_debug;
-module_param_named(debug, cec_debug, int, 0644);
-MODULE_PARM_DESC(debug, "debug level (0-2)");
-
-static bool debug_phys_addr;
-module_param(debug_phys_addr, bool, 0644);
-MODULE_PARM_DESC(debug_phys_addr, "add CEC_CAP_PHYS_ADDR if set");
-
-static dev_t cec_dev_t;
-
-/* Active devices */
-static DEFINE_MUTEX(cec_devnode_lock);
-static DECLARE_BITMAP(cec_devnode_nums, CEC_NUM_DEVICES);
-
-static struct dentry *top_cec_dir;
-
-/* dev to cec_devnode */
-#define to_cec_devnode(cd) container_of(cd, struct cec_devnode, dev)
-
-int cec_get_device(struct cec_devnode *devnode)
-{
- /*
- * Check if the cec device is available. This needs to be done with
- * the devnode->lock held to prevent an open/unregister race:
- * without the lock, the device could be unregistered and freed between
- * the devnode->registered check and get_device() calls, leading to
- * a crash.
- */
- mutex_lock(&devnode->lock);
- /*
- * return ENXIO if the cec device has been removed
- * already or if it is not registered anymore.
- */
- if (!devnode->registered) {
- mutex_unlock(&devnode->lock);
- return -ENXIO;
- }
- /* and increase the device refcount */
- get_device(&devnode->dev);
- mutex_unlock(&devnode->lock);
- return 0;
-}
-
-void cec_put_device(struct cec_devnode *devnode)
-{
- put_device(&devnode->dev);
-}
-
-/* Called when the last user of the cec device exits. */
-static void cec_devnode_release(struct device *cd)
-{
- struct cec_devnode *devnode = to_cec_devnode(cd);
-
- mutex_lock(&cec_devnode_lock);
- /* Mark device node number as free */
- clear_bit(devnode->minor, cec_devnode_nums);
- mutex_unlock(&cec_devnode_lock);
-
- cec_delete_adapter(to_cec_adapter(devnode));
-}
-
-static struct bus_type cec_bus_type = {
- .name = CEC_NAME,
-};
-
-/*
- * Register a cec device node
- *
- * The registration code assigns minor numbers and registers the new device node
- * with the kernel. An error is returned if no free minor number can be found,
- * or if the registration of the device node fails.
- *
- * Zero is returned on success.
- *
- * Note that if the cec_devnode_register call fails, the release() callback of
- * the cec_devnode structure is *not* called, so the caller is responsible for
- * freeing any data.
- */
-static int __must_check cec_devnode_register(struct cec_devnode *devnode,
- struct module *owner)
-{
- int minor;
- int ret;
-
- /* Part 1: Find a free minor number */
- mutex_lock(&cec_devnode_lock);
- minor = find_next_zero_bit(cec_devnode_nums, CEC_NUM_DEVICES, 0);
- if (minor == CEC_NUM_DEVICES) {
- mutex_unlock(&cec_devnode_lock);
- pr_err("could not get a free minor\n");
- return -ENFILE;
- }
-
- set_bit(minor, cec_devnode_nums);
- mutex_unlock(&cec_devnode_lock);
-
- devnode->minor = minor;
- devnode->dev.bus = &cec_bus_type;
- devnode->dev.devt = MKDEV(MAJOR(cec_dev_t), minor);
- devnode->dev.release = cec_devnode_release;
- dev_set_name(&devnode->dev, "cec%d", devnode->minor);
- device_initialize(&devnode->dev);
-
- /* Part 2: Initialize and register the character device */
- cdev_init(&devnode->cdev, &cec_devnode_fops);
- devnode->cdev.owner = owner;
- kobject_set_name(&devnode->cdev.kobj, "cec%d", devnode->minor);
-
- devnode->registered = true;
- ret = cdev_device_add(&devnode->cdev, &devnode->dev);
- if (ret) {
- devnode->registered = false;
- pr_err("%s: cdev_device_add failed\n", __func__);
- goto clr_bit;
- }
-
- return 0;
-
-clr_bit:
- mutex_lock(&cec_devnode_lock);
- clear_bit(devnode->minor, cec_devnode_nums);
- mutex_unlock(&cec_devnode_lock);
- return ret;
-}
-
-/*
- * Unregister a cec device node
- *
- * This unregisters the passed device. Future open calls will be met with
- * errors.
- *
- * This function can safely be called if the device node has never been
- * registered or has already been unregistered.
- */
-static void cec_devnode_unregister(struct cec_adapter *adap)
-{
- struct cec_devnode *devnode = &adap->devnode;
- struct cec_fh *fh;
-
- mutex_lock(&devnode->lock);
-
- /* Check if devnode was never registered or already unregistered */
- if (!devnode->registered || devnode->unregistered) {
- mutex_unlock(&devnode->lock);
- return;
- }
-
- list_for_each_entry(fh, &devnode->fhs, list)
- wake_up_interruptible(&fh->wait);
-
- devnode->registered = false;
- devnode->unregistered = true;
- mutex_unlock(&devnode->lock);
-
- mutex_lock(&adap->lock);
- __cec_s_phys_addr(adap, CEC_PHYS_ADDR_INVALID, false);
- __cec_s_log_addrs(adap, NULL, false);
- mutex_unlock(&adap->lock);
-
- cdev_device_del(&devnode->cdev, &devnode->dev);
- put_device(&devnode->dev);
-}
-
-#ifdef CONFIG_DEBUG_FS
-static ssize_t cec_error_inj_write(struct file *file,
- const char __user *ubuf, size_t count, loff_t *ppos)
-{
- struct seq_file *sf = file->private_data;
- struct cec_adapter *adap = sf->private;
- char *buf;
- char *line;
- char *p;
-
- buf = memdup_user_nul(ubuf, min_t(size_t, PAGE_SIZE, count));
- if (IS_ERR(buf))
- return PTR_ERR(buf);
- p = buf;
- while (p && *p) {
- p = skip_spaces(p);
- line = strsep(&p, "\n");
- if (!*line || *line == '#')
- continue;
- if (!adap->ops->error_inj_parse_line(adap, line)) {
- kfree(buf);
- return -EINVAL;
- }
- }
- kfree(buf);
- return count;
-}
-
-static int cec_error_inj_show(struct seq_file *sf, void *unused)
-{
- struct cec_adapter *adap = sf->private;
-
- return adap->ops->error_inj_show(adap, sf);
-}
-
-static int cec_error_inj_open(struct inode *inode, struct file *file)
-{
- return single_open(file, cec_error_inj_show, inode->i_private);
-}
-
-static const struct file_operations cec_error_inj_fops = {
- .open = cec_error_inj_open,
- .write = cec_error_inj_write,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-#endif
-
-struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops,
- void *priv, const char *name, u32 caps,
- u8 available_las)
-{
- struct cec_adapter *adap;
- int res;
-
-#ifndef CONFIG_MEDIA_CEC_RC
- caps &= ~CEC_CAP_RC;
-#endif
-
- if (WARN_ON(!caps))
- return ERR_PTR(-EINVAL);
- if (WARN_ON(!ops))
- return ERR_PTR(-EINVAL);
- if (WARN_ON(!available_las || available_las > CEC_MAX_LOG_ADDRS))
- return ERR_PTR(-EINVAL);
- adap = kzalloc(sizeof(*adap), GFP_KERNEL);
- if (!adap)
- return ERR_PTR(-ENOMEM);
- strscpy(adap->name, name, sizeof(adap->name));
- adap->phys_addr = CEC_PHYS_ADDR_INVALID;
- adap->cec_pin_is_high = true;
- adap->log_addrs.cec_version = CEC_OP_CEC_VERSION_2_0;
- adap->log_addrs.vendor_id = CEC_VENDOR_ID_NONE;
- adap->capabilities = caps;
- if (debug_phys_addr)
- adap->capabilities |= CEC_CAP_PHYS_ADDR;
- adap->needs_hpd = caps & CEC_CAP_NEEDS_HPD;
- adap->available_log_addrs = available_las;
- adap->sequence = 0;
- adap->ops = ops;
- adap->priv = priv;
- memset(adap->phys_addrs, 0xff, sizeof(adap->phys_addrs));
- mutex_init(&adap->lock);
- INIT_LIST_HEAD(&adap->transmit_queue);
- INIT_LIST_HEAD(&adap->wait_queue);
- init_waitqueue_head(&adap->kthread_waitq);
-
- /* adap->devnode initialization */
- INIT_LIST_HEAD(&adap->devnode.fhs);
- mutex_init(&adap->devnode.lock);
-
- adap->kthread = kthread_run(cec_thread_func, adap, "cec-%s", name);
- if (IS_ERR(adap->kthread)) {
- pr_err("cec-%s: kernel_thread() failed\n", name);
- res = PTR_ERR(adap->kthread);
- kfree(adap);
- return ERR_PTR(res);
- }
-
-#ifdef CONFIG_MEDIA_CEC_RC
- if (!(caps & CEC_CAP_RC))
- return adap;
-
- /* Prepare the RC input device */
- adap->rc = rc_allocate_device(RC_DRIVER_SCANCODE);
- if (!adap->rc) {
- pr_err("cec-%s: failed to allocate memory for rc_dev\n",
- name);
- kthread_stop(adap->kthread);
- kfree(adap);
- return ERR_PTR(-ENOMEM);
- }
-
- snprintf(adap->input_phys, sizeof(adap->input_phys),
- "%s/input0", adap->name);
-
- adap->rc->device_name = adap->name;
- adap->rc->input_phys = adap->input_phys;
- adap->rc->input_id.bustype = BUS_CEC;
- adap->rc->input_id.vendor = 0;
- adap->rc->input_id.product = 0;
- adap->rc->input_id.version = 1;
- adap->rc->driver_name = CEC_NAME;
- adap->rc->allowed_protocols = RC_PROTO_BIT_CEC;
- adap->rc->priv = adap;
- adap->rc->map_name = RC_MAP_CEC;
- adap->rc->timeout = MS_TO_NS(550);
-#endif
- return adap;
-}
-EXPORT_SYMBOL_GPL(cec_allocate_adapter);
-
-int cec_register_adapter(struct cec_adapter *adap,
- struct device *parent)
-{
- int res;
-
- if (IS_ERR_OR_NULL(adap))
- return 0;
-
- if (WARN_ON(!parent))
- return -EINVAL;
-
- adap->owner = parent->driver->owner;
- adap->devnode.dev.parent = parent;
-
-#ifdef CONFIG_MEDIA_CEC_RC
- if (adap->capabilities & CEC_CAP_RC) {
- adap->rc->dev.parent = parent;
- res = rc_register_device(adap->rc);
-
- if (res) {
- pr_err("cec-%s: failed to prepare input device\n",
- adap->name);
- rc_free_device(adap->rc);
- adap->rc = NULL;
- return res;
- }
- }
-#endif
-
- res = cec_devnode_register(&adap->devnode, adap->owner);
- if (res) {
-#ifdef CONFIG_MEDIA_CEC_RC
- /* Note: rc_unregister also calls rc_free */
- rc_unregister_device(adap->rc);
- adap->rc = NULL;
-#endif
- return res;
- }
-
- dev_set_drvdata(&adap->devnode.dev, adap);
-#ifdef CONFIG_DEBUG_FS
- if (!top_cec_dir)
- return 0;
-
- adap->cec_dir = debugfs_create_dir(dev_name(&adap->devnode.dev), top_cec_dir);
- if (IS_ERR_OR_NULL(adap->cec_dir)) {
- pr_warn("cec-%s: Failed to create debugfs dir\n", adap->name);
- return 0;
- }
- adap->status_file = debugfs_create_devm_seqfile(&adap->devnode.dev,
- "status", adap->cec_dir, cec_adap_status);
- if (IS_ERR_OR_NULL(adap->status_file)) {
- pr_warn("cec-%s: Failed to create status file\n", adap->name);
- debugfs_remove_recursive(adap->cec_dir);
- adap->cec_dir = NULL;
- return 0;
- }
- if (!adap->ops->error_inj_show || !adap->ops->error_inj_parse_line)
- return 0;
- adap->error_inj_file = debugfs_create_file("error-inj", 0644,
- adap->cec_dir, adap,
- &cec_error_inj_fops);
- if (IS_ERR_OR_NULL(adap->error_inj_file))
- pr_warn("cec-%s: Failed to create error-inj file\n",
- adap->name);
-#endif
- return 0;
-}
-EXPORT_SYMBOL_GPL(cec_register_adapter);
-
-void cec_unregister_adapter(struct cec_adapter *adap)
-{
- if (IS_ERR_OR_NULL(adap))
- return;
-
-#ifdef CONFIG_MEDIA_CEC_RC
- /* Note: rc_unregister also calls rc_free */
- rc_unregister_device(adap->rc);
- adap->rc = NULL;
-#endif
- debugfs_remove_recursive(adap->cec_dir);
-#ifdef CONFIG_CEC_NOTIFIER
- cec_notifier_cec_adap_unregister(adap->notifier, adap);
-#endif
- cec_devnode_unregister(adap);
-}
-EXPORT_SYMBOL_GPL(cec_unregister_adapter);
-
-void cec_delete_adapter(struct cec_adapter *adap)
-{
- if (IS_ERR_OR_NULL(adap))
- return;
- kthread_stop(adap->kthread);
- if (adap->kthread_config)
- kthread_stop(adap->kthread_config);
- if (adap->ops->adap_free)
- adap->ops->adap_free(adap);
-#ifdef CONFIG_MEDIA_CEC_RC
- rc_free_device(adap->rc);
-#endif
- kfree(adap);
-}
-EXPORT_SYMBOL_GPL(cec_delete_adapter);
-
-/*
- * Initialise cec for linux
- */
-static int __init cec_devnode_init(void)
-{
- int ret = alloc_chrdev_region(&cec_dev_t, 0, CEC_NUM_DEVICES, CEC_NAME);
-
- if (ret < 0) {
- pr_warn("cec: unable to allocate major\n");
- return ret;
- }
-
-#ifdef CONFIG_DEBUG_FS
- top_cec_dir = debugfs_create_dir("cec", NULL);
- if (IS_ERR_OR_NULL(top_cec_dir)) {
- pr_warn("cec: Failed to create debugfs cec dir\n");
- top_cec_dir = NULL;
- }
-#endif
-
- ret = bus_register(&cec_bus_type);
- if (ret < 0) {
- unregister_chrdev_region(cec_dev_t, CEC_NUM_DEVICES);
- pr_warn("cec: bus_register failed\n");
- return -EIO;
- }
-
- return 0;
-}
-
-static void __exit cec_devnode_exit(void)
-{
- debugfs_remove_recursive(top_cec_dir);
- bus_unregister(&cec_bus_type);
- unregister_chrdev_region(cec_dev_t, CEC_NUM_DEVICES);
-}
-
-subsys_initcall(cec_devnode_init);
-module_exit(cec_devnode_exit)
-
-MODULE_AUTHOR("Hans Verkuil <hans.verkuil@cisco.com>");
-MODULE_DESCRIPTION("Device node registration for cec drivers");
-MODULE_LICENSE("GPL");
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * cec-notifier.c - notify CEC drivers of physical address changes
- *
- * Copyright 2016 Russell King <rmk+kernel@arm.linux.org.uk>
- * Copyright 2016-2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
- */
-
-#include <linux/export.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <linux/list.h>
-#include <linux/kref.h>
-#include <linux/of_platform.h>
-
-#include <media/cec.h>
-#include <media/cec-notifier.h>
-#include <drm/drm_edid.h>
-
-struct cec_notifier {
- struct mutex lock;
- struct list_head head;
- struct kref kref;
- struct device *hdmi_dev;
- struct cec_connector_info conn_info;
- const char *port_name;
- struct cec_adapter *cec_adap;
-
- u16 phys_addr;
-};
-
-static LIST_HEAD(cec_notifiers);
-static DEFINE_MUTEX(cec_notifiers_lock);
-
-/**
- * cec_notifier_get_conn - find or create a new cec_notifier for the given
- * device and connector tuple.
- * @hdmi_dev: device that sends the events.
- * @port_name: the connector name from which the event occurs
- *
- * If a notifier for device @dev already exists, then increase the refcount
- * and return that notifier.
- *
- * If it doesn't exist, then allocate a new notifier struct and return a
- * pointer to that new struct.
- *
- * Return NULL if the memory could not be allocated.
- */
-static struct cec_notifier *
-cec_notifier_get_conn(struct device *hdmi_dev, const char *port_name)
-{
- struct cec_notifier *n;
-
- mutex_lock(&cec_notifiers_lock);
- list_for_each_entry(n, &cec_notifiers, head) {
- if (n->hdmi_dev == hdmi_dev &&
- (!port_name ||
- (n->port_name && !strcmp(n->port_name, port_name)))) {
- kref_get(&n->kref);
- mutex_unlock(&cec_notifiers_lock);
- return n;
- }
- }
- n = kzalloc(sizeof(*n), GFP_KERNEL);
- if (!n)
- goto unlock;
- n->hdmi_dev = hdmi_dev;
- if (port_name) {
- n->port_name = kstrdup(port_name, GFP_KERNEL);
- if (!n->port_name) {
- kfree(n);
- n = NULL;
- goto unlock;
- }
- }
- n->phys_addr = CEC_PHYS_ADDR_INVALID;
-
- mutex_init(&n->lock);
- kref_init(&n->kref);
- list_add_tail(&n->head, &cec_notifiers);
-unlock:
- mutex_unlock(&cec_notifiers_lock);
- return n;
-}
-
-static void cec_notifier_release(struct kref *kref)
-{
- struct cec_notifier *n =
- container_of(kref, struct cec_notifier, kref);
-
- list_del(&n->head);
- kfree(n->port_name);
- kfree(n);
-}
-
-static void cec_notifier_put(struct cec_notifier *n)
-{
- mutex_lock(&cec_notifiers_lock);
- kref_put(&n->kref, cec_notifier_release);
- mutex_unlock(&cec_notifiers_lock);
-}
-
-struct cec_notifier *
-cec_notifier_conn_register(struct device *hdmi_dev, const char *port_name,
- const struct cec_connector_info *conn_info)
-{
- struct cec_notifier *n = cec_notifier_get_conn(hdmi_dev, port_name);
-
- if (!n)
- return n;
-
- mutex_lock(&n->lock);
- n->phys_addr = CEC_PHYS_ADDR_INVALID;
- if (conn_info)
- n->conn_info = *conn_info;
- else
- memset(&n->conn_info, 0, sizeof(n->conn_info));
- if (n->cec_adap) {
- cec_phys_addr_invalidate(n->cec_adap);
- cec_s_conn_info(n->cec_adap, conn_info);
- }
- mutex_unlock(&n->lock);
- return n;
-}
-EXPORT_SYMBOL_GPL(cec_notifier_conn_register);
-
-void cec_notifier_conn_unregister(struct cec_notifier *n)
-{
- if (!n)
- return;
-
- mutex_lock(&n->lock);
- memset(&n->conn_info, 0, sizeof(n->conn_info));
- n->phys_addr = CEC_PHYS_ADDR_INVALID;
- if (n->cec_adap) {
- cec_phys_addr_invalidate(n->cec_adap);
- cec_s_conn_info(n->cec_adap, NULL);
- }
- mutex_unlock(&n->lock);
- cec_notifier_put(n);
-}
-EXPORT_SYMBOL_GPL(cec_notifier_conn_unregister);
-
-struct cec_notifier *
-cec_notifier_cec_adap_register(struct device *hdmi_dev, const char *port_name,
- struct cec_adapter *adap)
-{
- struct cec_notifier *n;
-
- if (WARN_ON(!adap))
- return NULL;
-
- n = cec_notifier_get_conn(hdmi_dev, port_name);
- if (!n)
- return n;
-
- mutex_lock(&n->lock);
- n->cec_adap = adap;
- adap->conn_info = n->conn_info;
- adap->notifier = n;
- cec_s_phys_addr(adap, n->phys_addr, false);
- mutex_unlock(&n->lock);
- return n;
-}
-EXPORT_SYMBOL_GPL(cec_notifier_cec_adap_register);
-
-void cec_notifier_cec_adap_unregister(struct cec_notifier *n,
- struct cec_adapter *adap)
-{
- if (!n)
- return;
-
- mutex_lock(&n->lock);
- adap->notifier = NULL;
- n->cec_adap = NULL;
- mutex_unlock(&n->lock);
- cec_notifier_put(n);
-}
-EXPORT_SYMBOL_GPL(cec_notifier_cec_adap_unregister);
-
-void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa)
-{
- if (n == NULL)
- return;
-
- mutex_lock(&n->lock);
- n->phys_addr = pa;
- if (n->cec_adap)
- cec_s_phys_addr(n->cec_adap, n->phys_addr, false);
- mutex_unlock(&n->lock);
-}
-EXPORT_SYMBOL_GPL(cec_notifier_set_phys_addr);
-
-void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n,
- const struct edid *edid)
-{
- u16 pa = CEC_PHYS_ADDR_INVALID;
-
- if (n == NULL)
- return;
-
- if (edid && edid->extensions)
- pa = cec_get_edid_phys_addr((const u8 *)edid,
- EDID_LENGTH * (edid->extensions + 1), NULL);
- cec_notifier_set_phys_addr(n, pa);
-}
-EXPORT_SYMBOL_GPL(cec_notifier_set_phys_addr_from_edid);
-
-struct device *cec_notifier_parse_hdmi_phandle(struct device *dev)
-{
- struct platform_device *hdmi_pdev;
- struct device *hdmi_dev = NULL;
- struct device_node *np;
-
- np = of_parse_phandle(dev->of_node, "hdmi-phandle", 0);
-
- if (!np) {
- dev_err(dev, "Failed to find HDMI node in device tree\n");
- return ERR_PTR(-ENODEV);
- }
- hdmi_pdev = of_find_device_by_node(np);
- of_node_put(np);
- if (hdmi_pdev) {
- hdmi_dev = &hdmi_pdev->dev;
- /*
- * Note that the device struct is only used as a key into the
- * cec_notifiers list, it is never actually accessed.
- * So we decrement the reference here so we don't leak
- * memory.
- */
- put_device(hdmi_dev);
- return hdmi_dev;
- }
- return ERR_PTR(-EPROBE_DEFER);
-}
-EXPORT_SYMBOL_GPL(cec_notifier_parse_hdmi_phandle);
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
- */
-
-#include <linux/delay.h>
-#include <linux/slab.h>
-#include <linux/sched/types.h>
-
-#include <media/cec-pin.h>
-#include "cec-pin-priv.h"
-
-struct cec_error_inj_cmd {
- unsigned int mode_offset;
- int arg_idx;
- const char *cmd;
-};
-
-static const struct cec_error_inj_cmd cec_error_inj_cmds[] = {
- { CEC_ERROR_INJ_RX_NACK_OFFSET, -1, "rx-nack" },
- { CEC_ERROR_INJ_RX_LOW_DRIVE_OFFSET,
- CEC_ERROR_INJ_RX_LOW_DRIVE_ARG_IDX, "rx-low-drive" },
- { CEC_ERROR_INJ_RX_ADD_BYTE_OFFSET, -1, "rx-add-byte" },
- { CEC_ERROR_INJ_RX_REMOVE_BYTE_OFFSET, -1, "rx-remove-byte" },
- { CEC_ERROR_INJ_RX_ARB_LOST_OFFSET,
- CEC_ERROR_INJ_RX_ARB_LOST_ARG_IDX, "rx-arb-lost" },
-
- { CEC_ERROR_INJ_TX_NO_EOM_OFFSET, -1, "tx-no-eom" },
- { CEC_ERROR_INJ_TX_EARLY_EOM_OFFSET, -1, "tx-early-eom" },
- { CEC_ERROR_INJ_TX_ADD_BYTES_OFFSET,
- CEC_ERROR_INJ_TX_ADD_BYTES_ARG_IDX, "tx-add-bytes" },
- { CEC_ERROR_INJ_TX_REMOVE_BYTE_OFFSET, -1, "tx-remove-byte" },
- { CEC_ERROR_INJ_TX_SHORT_BIT_OFFSET,
- CEC_ERROR_INJ_TX_SHORT_BIT_ARG_IDX, "tx-short-bit" },
- { CEC_ERROR_INJ_TX_LONG_BIT_OFFSET,
- CEC_ERROR_INJ_TX_LONG_BIT_ARG_IDX, "tx-long-bit" },
- { CEC_ERROR_INJ_TX_CUSTOM_BIT_OFFSET,
- CEC_ERROR_INJ_TX_CUSTOM_BIT_ARG_IDX, "tx-custom-bit" },
- { CEC_ERROR_INJ_TX_SHORT_START_OFFSET, -1, "tx-short-start" },
- { CEC_ERROR_INJ_TX_LONG_START_OFFSET, -1, "tx-long-start" },
- { CEC_ERROR_INJ_TX_CUSTOM_START_OFFSET, -1, "tx-custom-start" },
- { CEC_ERROR_INJ_TX_LAST_BIT_OFFSET,
- CEC_ERROR_INJ_TX_LAST_BIT_ARG_IDX, "tx-last-bit" },
- { CEC_ERROR_INJ_TX_LOW_DRIVE_OFFSET,
- CEC_ERROR_INJ_TX_LOW_DRIVE_ARG_IDX, "tx-low-drive" },
- { 0, -1, NULL }
-};
-
-u16 cec_pin_rx_error_inj(struct cec_pin *pin)
-{
- u16 cmd = CEC_ERROR_INJ_OP_ANY;
-
- /* Only when 18 bits have been received do we have a valid cmd */
- if (!(pin->error_inj[cmd] & CEC_ERROR_INJ_RX_MASK) &&
- pin->rx_bit >= 18)
- cmd = pin->rx_msg.msg[1];
- return (pin->error_inj[cmd] & CEC_ERROR_INJ_RX_MASK) ? cmd :
- CEC_ERROR_INJ_OP_ANY;
-}
-
-u16 cec_pin_tx_error_inj(struct cec_pin *pin)
-{
- u16 cmd = CEC_ERROR_INJ_OP_ANY;
-
- if (!(pin->error_inj[cmd] & CEC_ERROR_INJ_TX_MASK) &&
- pin->tx_msg.len > 1)
- cmd = pin->tx_msg.msg[1];
- return (pin->error_inj[cmd] & CEC_ERROR_INJ_TX_MASK) ? cmd :
- CEC_ERROR_INJ_OP_ANY;
-}
-
-bool cec_pin_error_inj_parse_line(struct cec_adapter *adap, char *line)
-{
- static const char *delims = " \t\r";
- struct cec_pin *pin = adap->pin;
- unsigned int i;
- bool has_pos = false;
- char *p = line;
- char *token;
- char *comma;
- u64 *error;
- u8 *args;
- bool has_op;
- u8 op;
- u8 mode;
- u8 pos;
-
- p = skip_spaces(p);
- token = strsep(&p, delims);
- if (!strcmp(token, "clear")) {
- memset(pin->error_inj, 0, sizeof(pin->error_inj));
- pin->rx_toggle = pin->tx_toggle = false;
- pin->tx_ignore_nack_until_eom = false;
- pin->tx_custom_pulse = false;
- pin->tx_custom_low_usecs = CEC_TIM_CUSTOM_DEFAULT;
- pin->tx_custom_high_usecs = CEC_TIM_CUSTOM_DEFAULT;
- return true;
- }
- if (!strcmp(token, "rx-clear")) {
- for (i = 0; i <= CEC_ERROR_INJ_OP_ANY; i++)
- pin->error_inj[i] &= ~CEC_ERROR_INJ_RX_MASK;
- pin->rx_toggle = false;
- return true;
- }
- if (!strcmp(token, "tx-clear")) {
- for (i = 0; i <= CEC_ERROR_INJ_OP_ANY; i++)
- pin->error_inj[i] &= ~CEC_ERROR_INJ_TX_MASK;
- pin->tx_toggle = false;
- pin->tx_ignore_nack_until_eom = false;
- pin->tx_custom_pulse = false;
- pin->tx_custom_low_usecs = CEC_TIM_CUSTOM_DEFAULT;
- pin->tx_custom_high_usecs = CEC_TIM_CUSTOM_DEFAULT;
- return true;
- }
- if (!strcmp(token, "tx-ignore-nack-until-eom")) {
- pin->tx_ignore_nack_until_eom = true;
- return true;
- }
- if (!strcmp(token, "tx-custom-pulse")) {
- pin->tx_custom_pulse = true;
- cec_pin_start_timer(pin);
- return true;
- }
- if (!p)
- return false;
-
- p = skip_spaces(p);
- if (!strcmp(token, "tx-custom-low-usecs")) {
- u32 usecs;
-
- if (kstrtou32(p, 0, &usecs) || usecs > 10000000)
- return false;
- pin->tx_custom_low_usecs = usecs;
- return true;
- }
- if (!strcmp(token, "tx-custom-high-usecs")) {
- u32 usecs;
-
- if (kstrtou32(p, 0, &usecs) || usecs > 10000000)
- return false;
- pin->tx_custom_high_usecs = usecs;
- return true;
- }
-
- comma = strchr(token, ',');
- if (comma)
- *comma++ = '\0';
- if (!strcmp(token, "any")) {
- has_op = false;
- error = pin->error_inj + CEC_ERROR_INJ_OP_ANY;
- args = pin->error_inj_args[CEC_ERROR_INJ_OP_ANY];
- } else if (!kstrtou8(token, 0, &op)) {
- has_op = true;
- error = pin->error_inj + op;
- args = pin->error_inj_args[op];
- } else {
- return false;
- }
-
- mode = CEC_ERROR_INJ_MODE_ONCE;
- if (comma) {
- if (!strcmp(comma, "off"))
- mode = CEC_ERROR_INJ_MODE_OFF;
- else if (!strcmp(comma, "once"))
- mode = CEC_ERROR_INJ_MODE_ONCE;
- else if (!strcmp(comma, "always"))
- mode = CEC_ERROR_INJ_MODE_ALWAYS;
- else if (!strcmp(comma, "toggle"))
- mode = CEC_ERROR_INJ_MODE_TOGGLE;
- else
- return false;
- }
-
- token = strsep(&p, delims);
- if (p) {
- p = skip_spaces(p);
- has_pos = !kstrtou8(p, 0, &pos);
- }
-
- if (!strcmp(token, "clear")) {
- *error = 0;
- return true;
- }
- if (!strcmp(token, "rx-clear")) {
- *error &= ~CEC_ERROR_INJ_RX_MASK;
- return true;
- }
- if (!strcmp(token, "tx-clear")) {
- *error &= ~CEC_ERROR_INJ_TX_MASK;
- return true;
- }
-
- for (i = 0; cec_error_inj_cmds[i].cmd; i++) {
- const char *cmd = cec_error_inj_cmds[i].cmd;
- unsigned int mode_offset;
- u64 mode_mask;
- int arg_idx;
- bool is_bit_pos = true;
-
- if (strcmp(token, cmd))
- continue;
-
- mode_offset = cec_error_inj_cmds[i].mode_offset;
- mode_mask = CEC_ERROR_INJ_MODE_MASK << mode_offset;
- arg_idx = cec_error_inj_cmds[i].arg_idx;
-
- if (mode_offset == CEC_ERROR_INJ_RX_ARB_LOST_OFFSET) {
- if (has_op)
- return false;
- if (!has_pos)
- pos = 0x0f;
- is_bit_pos = false;
- } else if (mode_offset == CEC_ERROR_INJ_TX_ADD_BYTES_OFFSET) {
- if (!has_pos || !pos)
- return false;
- is_bit_pos = false;
- }
-
- if (arg_idx >= 0 && is_bit_pos) {
- if (!has_pos || pos >= 160)
- return false;
- if (has_op && pos < 10 + 8)
- return false;
- /* Invalid bit position may not be the Ack bit */
- if ((mode_offset == CEC_ERROR_INJ_TX_SHORT_BIT_OFFSET ||
- mode_offset == CEC_ERROR_INJ_TX_LONG_BIT_OFFSET ||
- mode_offset == CEC_ERROR_INJ_TX_CUSTOM_BIT_OFFSET) &&
- (pos % 10) == 9)
- return false;
- }
- *error &= ~mode_mask;
- *error |= (u64)mode << mode_offset;
- if (arg_idx >= 0)
- args[arg_idx] = pos;
- return true;
- }
- return false;
-}
-
-static void cec_pin_show_cmd(struct seq_file *sf, u32 cmd, u8 mode)
-{
- if (cmd == CEC_ERROR_INJ_OP_ANY)
- seq_puts(sf, "any,");
- else
- seq_printf(sf, "0x%02x,", cmd);
- switch (mode) {
- case CEC_ERROR_INJ_MODE_ONCE:
- seq_puts(sf, "once ");
- break;
- case CEC_ERROR_INJ_MODE_ALWAYS:
- seq_puts(sf, "always ");
- break;
- case CEC_ERROR_INJ_MODE_TOGGLE:
- seq_puts(sf, "toggle ");
- break;
- default:
- seq_puts(sf, "off ");
- break;
- }
-}
-
-int cec_pin_error_inj_show(struct cec_adapter *adap, struct seq_file *sf)
-{
- struct cec_pin *pin = adap->pin;
- unsigned int i, j;
-
- seq_puts(sf, "# Clear error injections:\n");
- seq_puts(sf, "# clear clear all rx and tx error injections\n");
- seq_puts(sf, "# rx-clear clear all rx error injections\n");
- seq_puts(sf, "# tx-clear clear all tx error injections\n");
- seq_puts(sf, "# <op> clear clear all rx and tx error injections for <op>\n");
- seq_puts(sf, "# <op> rx-clear clear all rx error injections for <op>\n");
- seq_puts(sf, "# <op> tx-clear clear all tx error injections for <op>\n");
- seq_puts(sf, "#\n");
- seq_puts(sf, "# RX error injection:\n");
- seq_puts(sf, "# <op>[,<mode>] rx-nack NACK the message instead of sending an ACK\n");
- seq_puts(sf, "# <op>[,<mode>] rx-low-drive <bit> force a low-drive condition at this bit position\n");
- seq_puts(sf, "# <op>[,<mode>] rx-add-byte add a spurious byte to the received CEC message\n");
- seq_puts(sf, "# <op>[,<mode>] rx-remove-byte remove the last byte from the received CEC message\n");
- seq_puts(sf, "# <op>[,<mode>] rx-arb-lost <poll> generate a POLL message to trigger an arbitration lost\n");
- seq_puts(sf, "#\n");
- seq_puts(sf, "# TX error injection settings:\n");
- seq_puts(sf, "# tx-ignore-nack-until-eom ignore early NACKs until EOM\n");
- seq_puts(sf, "# tx-custom-low-usecs <usecs> define the 'low' time for the custom pulse\n");
- seq_puts(sf, "# tx-custom-high-usecs <usecs> define the 'high' time for the custom pulse\n");
- seq_puts(sf, "# tx-custom-pulse transmit the custom pulse once the bus is idle\n");
- seq_puts(sf, "#\n");
- seq_puts(sf, "# TX error injection:\n");
- seq_puts(sf, "# <op>[,<mode>] tx-no-eom don't set the EOM bit\n");
- seq_puts(sf, "# <op>[,<mode>] tx-early-eom set the EOM bit one byte too soon\n");
- seq_puts(sf, "# <op>[,<mode>] tx-add-bytes <num> append <num> (1-255) spurious bytes to the message\n");
- seq_puts(sf, "# <op>[,<mode>] tx-remove-byte drop the last byte from the message\n");
- seq_puts(sf, "# <op>[,<mode>] tx-short-bit <bit> make this bit shorter than allowed\n");
- seq_puts(sf, "# <op>[,<mode>] tx-long-bit <bit> make this bit longer than allowed\n");
- seq_puts(sf, "# <op>[,<mode>] tx-custom-bit <bit> send the custom pulse instead of this bit\n");
- seq_puts(sf, "# <op>[,<mode>] tx-short-start send a start pulse that's too short\n");
- seq_puts(sf, "# <op>[,<mode>] tx-long-start send a start pulse that's too long\n");
- seq_puts(sf, "# <op>[,<mode>] tx-custom-start send the custom pulse instead of the start pulse\n");
- seq_puts(sf, "# <op>[,<mode>] tx-last-bit <bit> stop sending after this bit\n");
- seq_puts(sf, "# <op>[,<mode>] tx-low-drive <bit> force a low-drive condition at this bit position\n");
- seq_puts(sf, "#\n");
- seq_puts(sf, "# <op> CEC message opcode (0-255) or 'any'\n");
- seq_puts(sf, "# <mode> 'once' (default), 'always', 'toggle' or 'off'\n");
- seq_puts(sf, "# <bit> CEC message bit (0-159)\n");
- seq_puts(sf, "# 10 bits per 'byte': bits 0-7: data, bit 8: EOM, bit 9: ACK\n");
- seq_puts(sf, "# <poll> CEC poll message used to test arbitration lost (0x00-0xff, default 0x0f)\n");
- seq_puts(sf, "# <usecs> microseconds (0-10000000, default 1000)\n");
-
- seq_puts(sf, "\nclear\n");
-
- for (i = 0; i < ARRAY_SIZE(pin->error_inj); i++) {
- u64 e = pin->error_inj[i];
-
- for (j = 0; cec_error_inj_cmds[j].cmd; j++) {
- const char *cmd = cec_error_inj_cmds[j].cmd;
- unsigned int mode;
- unsigned int mode_offset;
- int arg_idx;
-
- mode_offset = cec_error_inj_cmds[j].mode_offset;
- arg_idx = cec_error_inj_cmds[j].arg_idx;
- mode = (e >> mode_offset) & CEC_ERROR_INJ_MODE_MASK;
- if (!mode)
- continue;
- cec_pin_show_cmd(sf, i, mode);
- seq_puts(sf, cmd);
- if (arg_idx >= 0)
- seq_printf(sf, " %u",
- pin->error_inj_args[i][arg_idx]);
- seq_puts(sf, "\n");
- }
- }
-
- if (pin->tx_ignore_nack_until_eom)
- seq_puts(sf, "tx-ignore-nack-until-eom\n");
- if (pin->tx_custom_pulse)
- seq_puts(sf, "tx-custom-pulse\n");
- if (pin->tx_custom_low_usecs != CEC_TIM_CUSTOM_DEFAULT)
- seq_printf(sf, "tx-custom-low-usecs %u\n",
- pin->tx_custom_low_usecs);
- if (pin->tx_custom_high_usecs != CEC_TIM_CUSTOM_DEFAULT)
- seq_printf(sf, "tx-custom-high-usecs %u\n",
- pin->tx_custom_high_usecs);
- return 0;
-}
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * cec-pin-priv.h - internal cec-pin header
- *
- * Copyright 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
- */
-
-#ifndef LINUX_CEC_PIN_PRIV_H
-#define LINUX_CEC_PIN_PRIV_H
-
-#include <linux/types.h>
-#include <linux/atomic.h>
-#include <media/cec-pin.h>
-
-enum cec_pin_state {
- /* CEC is off */
- CEC_ST_OFF,
- /* CEC is idle, waiting for Rx or Tx */
- CEC_ST_IDLE,
-
- /* Tx states */
-
- /* Pending Tx, waiting for Signal Free Time to expire */
- CEC_ST_TX_WAIT,
- /* Low-drive was detected, wait for bus to go high */
- CEC_ST_TX_WAIT_FOR_HIGH,
- /* Drive CEC low for the start bit */
- CEC_ST_TX_START_BIT_LOW,
- /* Drive CEC high for the start bit */
- CEC_ST_TX_START_BIT_HIGH,
- /* Generate a start bit period that is too short */
- CEC_ST_TX_START_BIT_HIGH_SHORT,
- /* Generate a start bit period that is too long */
- CEC_ST_TX_START_BIT_HIGH_LONG,
- /* Drive CEC low for the start bit using the custom timing */
- CEC_ST_TX_START_BIT_LOW_CUSTOM,
- /* Drive CEC high for the start bit using the custom timing */
- CEC_ST_TX_START_BIT_HIGH_CUSTOM,
- /* Drive CEC low for the 0 bit */
- CEC_ST_TX_DATA_BIT_0_LOW,
- /* Drive CEC high for the 0 bit */
- CEC_ST_TX_DATA_BIT_0_HIGH,
- /* Generate a bit period that is too short */
- CEC_ST_TX_DATA_BIT_0_HIGH_SHORT,
- /* Generate a bit period that is too long */
- CEC_ST_TX_DATA_BIT_0_HIGH_LONG,
- /* Drive CEC low for the 1 bit */
- CEC_ST_TX_DATA_BIT_1_LOW,
- /* Drive CEC high for the 1 bit */
- CEC_ST_TX_DATA_BIT_1_HIGH,
- /* Generate a bit period that is too short */
- CEC_ST_TX_DATA_BIT_1_HIGH_SHORT,
- /* Generate a bit period that is too long */
- CEC_ST_TX_DATA_BIT_1_HIGH_LONG,
- /*
- * Wait for start of sample time to check for Ack bit or first
- * four initiator bits to check for Arbitration Lost.
- */
- CEC_ST_TX_DATA_BIT_1_HIGH_PRE_SAMPLE,
- /* Wait for end of bit period after sampling */
- CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE,
- /* Generate a bit period that is too short */
- CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_SHORT,
- /* Generate a bit period that is too long */
- CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_LONG,
- /* Drive CEC low for a data bit using the custom timing */
- CEC_ST_TX_DATA_BIT_LOW_CUSTOM,
- /* Drive CEC high for a data bit using the custom timing */
- CEC_ST_TX_DATA_BIT_HIGH_CUSTOM,
- /* Drive CEC low for a standalone pulse using the custom timing */
- CEC_ST_TX_PULSE_LOW_CUSTOM,
- /* Drive CEC high for a standalone pulse using the custom timing */
- CEC_ST_TX_PULSE_HIGH_CUSTOM,
- /* Start low drive */
- CEC_ST_TX_LOW_DRIVE,
-
- /* Rx states */
-
- /* Start bit low detected */
- CEC_ST_RX_START_BIT_LOW,
- /* Start bit high detected */
- CEC_ST_RX_START_BIT_HIGH,
- /* Wait for bit sample time */
- CEC_ST_RX_DATA_SAMPLE,
- /* Wait for earliest end of bit period after sampling */
- CEC_ST_RX_DATA_POST_SAMPLE,
- /* Wait for CEC to go low (i.e. end of bit period) */
- CEC_ST_RX_DATA_WAIT_FOR_LOW,
- /* Drive CEC low to send 0 Ack bit */
- CEC_ST_RX_ACK_LOW,
- /* End of 0 Ack time, wait for earliest end of bit period */
- CEC_ST_RX_ACK_LOW_POST,
- /* Wait for CEC to go high (i.e. end of bit period */
- CEC_ST_RX_ACK_HIGH_POST,
- /* Wait for earliest end of bit period and end of message */
- CEC_ST_RX_ACK_FINISH,
- /* Start low drive */
- CEC_ST_RX_LOW_DRIVE,
-
- /* Monitor pin using interrupts */
- CEC_ST_RX_IRQ,
-
- /* Total number of pin states */
- CEC_PIN_STATES
-};
-
-/* Error Injection */
-
-/* Error injection modes */
-#define CEC_ERROR_INJ_MODE_OFF 0
-#define CEC_ERROR_INJ_MODE_ONCE 1
-#define CEC_ERROR_INJ_MODE_ALWAYS 2
-#define CEC_ERROR_INJ_MODE_TOGGLE 3
-#define CEC_ERROR_INJ_MODE_MASK 3ULL
-
-/* Receive error injection options */
-#define CEC_ERROR_INJ_RX_NACK_OFFSET 0
-#define CEC_ERROR_INJ_RX_LOW_DRIVE_OFFSET 2
-#define CEC_ERROR_INJ_RX_ADD_BYTE_OFFSET 4
-#define CEC_ERROR_INJ_RX_REMOVE_BYTE_OFFSET 6
-#define CEC_ERROR_INJ_RX_ARB_LOST_OFFSET 8
-#define CEC_ERROR_INJ_RX_MASK 0xffffULL
-
-/* Transmit error injection options */
-#define CEC_ERROR_INJ_TX_NO_EOM_OFFSET 16
-#define CEC_ERROR_INJ_TX_EARLY_EOM_OFFSET 18
-#define CEC_ERROR_INJ_TX_SHORT_BIT_OFFSET 20
-#define CEC_ERROR_INJ_TX_LONG_BIT_OFFSET 22
-#define CEC_ERROR_INJ_TX_CUSTOM_BIT_OFFSET 24
-#define CEC_ERROR_INJ_TX_SHORT_START_OFFSET 26
-#define CEC_ERROR_INJ_TX_LONG_START_OFFSET 28
-#define CEC_ERROR_INJ_TX_CUSTOM_START_OFFSET 30
-#define CEC_ERROR_INJ_TX_LAST_BIT_OFFSET 32
-#define CEC_ERROR_INJ_TX_ADD_BYTES_OFFSET 34
-#define CEC_ERROR_INJ_TX_REMOVE_BYTE_OFFSET 36
-#define CEC_ERROR_INJ_TX_LOW_DRIVE_OFFSET 38
-#define CEC_ERROR_INJ_TX_MASK 0xffffffffffff0000ULL
-
-#define CEC_ERROR_INJ_RX_LOW_DRIVE_ARG_IDX 0
-#define CEC_ERROR_INJ_RX_ARB_LOST_ARG_IDX 1
-
-#define CEC_ERROR_INJ_TX_ADD_BYTES_ARG_IDX 2
-#define CEC_ERROR_INJ_TX_SHORT_BIT_ARG_IDX 3
-#define CEC_ERROR_INJ_TX_LONG_BIT_ARG_IDX 4
-#define CEC_ERROR_INJ_TX_CUSTOM_BIT_ARG_IDX 5
-#define CEC_ERROR_INJ_TX_LAST_BIT_ARG_IDX 6
-#define CEC_ERROR_INJ_TX_LOW_DRIVE_ARG_IDX 7
-#define CEC_ERROR_INJ_NUM_ARGS 8
-
-/* Special CEC op values */
-#define CEC_ERROR_INJ_OP_ANY 0x00000100
-
-/* The default for the low/high time of the custom pulse */
-#define CEC_TIM_CUSTOM_DEFAULT 1000
-
-#define CEC_NUM_PIN_EVENTS 128
-#define CEC_PIN_EVENT_FL_IS_HIGH (1 << 0)
-#define CEC_PIN_EVENT_FL_DROPPED (1 << 1)
-
-#define CEC_PIN_IRQ_UNCHANGED 0
-#define CEC_PIN_IRQ_DISABLE 1
-#define CEC_PIN_IRQ_ENABLE 2
-
-struct cec_pin {
- struct cec_adapter *adap;
- const struct cec_pin_ops *ops;
- struct task_struct *kthread;
- wait_queue_head_t kthread_waitq;
- struct hrtimer timer;
- ktime_t ts;
- unsigned int wait_usecs;
- u16 la_mask;
- bool enabled;
- bool monitor_all;
- bool rx_eom;
- bool enable_irq_failed;
- enum cec_pin_state state;
- struct cec_msg tx_msg;
- u32 tx_bit;
- bool tx_nacked;
- u32 tx_signal_free_time;
- bool tx_toggle;
- struct cec_msg rx_msg;
- u32 rx_bit;
- bool rx_toggle;
- u32 rx_start_bit_low_too_short_cnt;
- u64 rx_start_bit_low_too_short_ts;
- u32 rx_start_bit_low_too_short_delta;
- u32 rx_start_bit_too_short_cnt;
- u64 rx_start_bit_too_short_ts;
- u32 rx_start_bit_too_short_delta;
- u32 rx_start_bit_too_long_cnt;
- u32 rx_data_bit_too_short_cnt;
- u64 rx_data_bit_too_short_ts;
- u32 rx_data_bit_too_short_delta;
- u32 rx_data_bit_too_long_cnt;
- u32 rx_low_drive_cnt;
-
- struct cec_msg work_rx_msg;
- u8 work_tx_status;
- ktime_t work_tx_ts;
- atomic_t work_irq_change;
- atomic_t work_pin_num_events;
- unsigned int work_pin_events_wr;
- unsigned int work_pin_events_rd;
- ktime_t work_pin_ts[CEC_NUM_PIN_EVENTS];
- u8 work_pin_events[CEC_NUM_PIN_EVENTS];
- bool work_pin_events_dropped;
- u32 work_pin_events_dropped_cnt;
- ktime_t timer_ts;
- u32 timer_cnt;
- u32 timer_100ms_overruns;
- u32 timer_300ms_overruns;
- u32 timer_max_overrun;
- u32 timer_sum_overrun;
-
- u32 tx_custom_low_usecs;
- u32 tx_custom_high_usecs;
- bool tx_ignore_nack_until_eom;
- bool tx_custom_pulse;
- bool tx_generated_poll;
- bool tx_post_eom;
- u8 tx_extra_bytes;
- u32 tx_low_drive_cnt;
-#ifdef CONFIG_CEC_PIN_ERROR_INJ
- u64 error_inj[CEC_ERROR_INJ_OP_ANY + 1];
- u8 error_inj_args[CEC_ERROR_INJ_OP_ANY + 1][CEC_ERROR_INJ_NUM_ARGS];
-#endif
-};
-
-void cec_pin_start_timer(struct cec_pin *pin);
-
-#ifdef CONFIG_CEC_PIN_ERROR_INJ
-bool cec_pin_error_inj_parse_line(struct cec_adapter *adap, char *line);
-int cec_pin_error_inj_show(struct cec_adapter *adap, struct seq_file *sf);
-
-u16 cec_pin_rx_error_inj(struct cec_pin *pin);
-u16 cec_pin_tx_error_inj(struct cec_pin *pin);
-#endif
-
-#endif
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
- */
-
-#include <linux/delay.h>
-#include <linux/slab.h>
-#include <linux/sched/types.h>
-
-#include <media/cec-pin.h>
-#include "cec-pin-priv.h"
-
-/* All timings are in microseconds */
-
-/* start bit timings */
-#define CEC_TIM_START_BIT_LOW 3700
-#define CEC_TIM_START_BIT_LOW_MIN 3500
-#define CEC_TIM_START_BIT_LOW_MAX 3900
-#define CEC_TIM_START_BIT_TOTAL 4500
-#define CEC_TIM_START_BIT_TOTAL_MIN 4300
-#define CEC_TIM_START_BIT_TOTAL_MAX 4700
-
-/* data bit timings */
-#define CEC_TIM_DATA_BIT_0_LOW 1500
-#define CEC_TIM_DATA_BIT_0_LOW_MIN 1300
-#define CEC_TIM_DATA_BIT_0_LOW_MAX 1700
-#define CEC_TIM_DATA_BIT_1_LOW 600
-#define CEC_TIM_DATA_BIT_1_LOW_MIN 400
-#define CEC_TIM_DATA_BIT_1_LOW_MAX 800
-#define CEC_TIM_DATA_BIT_TOTAL 2400
-#define CEC_TIM_DATA_BIT_TOTAL_MIN 2050
-#define CEC_TIM_DATA_BIT_TOTAL_MAX 2750
-/* earliest safe time to sample the bit state */
-#define CEC_TIM_DATA_BIT_SAMPLE 850
-/* earliest time the bit is back to 1 (T7 + 50) */
-#define CEC_TIM_DATA_BIT_HIGH 1750
-
-/* when idle, sample once per millisecond */
-#define CEC_TIM_IDLE_SAMPLE 1000
-/* when processing the start bit, sample twice per millisecond */
-#define CEC_TIM_START_BIT_SAMPLE 500
-/* when polling for a state change, sample once every 50 microseconds */
-#define CEC_TIM_SAMPLE 50
-
-#define CEC_TIM_LOW_DRIVE_ERROR (1.5 * CEC_TIM_DATA_BIT_TOTAL)
-
-/*
- * Total data bit time that is too short/long for a valid bit,
- * used for error injection.
- */
-#define CEC_TIM_DATA_BIT_TOTAL_SHORT 1800
-#define CEC_TIM_DATA_BIT_TOTAL_LONG 2900
-
-/*
- * Total start bit time that is too short/long for a valid bit,
- * used for error injection.
- */
-#define CEC_TIM_START_BIT_TOTAL_SHORT 4100
-#define CEC_TIM_START_BIT_TOTAL_LONG 5000
-
-/* Data bits are 0-7, EOM is bit 8 and ACK is bit 9 */
-#define EOM_BIT 8
-#define ACK_BIT 9
-
-struct cec_state {
- const char * const name;
- unsigned int usecs;
-};
-
-static const struct cec_state states[CEC_PIN_STATES] = {
- { "Off", 0 },
- { "Idle", CEC_TIM_IDLE_SAMPLE },
- { "Tx Wait", CEC_TIM_SAMPLE },
- { "Tx Wait for High", CEC_TIM_IDLE_SAMPLE },
- { "Tx Start Bit Low", CEC_TIM_START_BIT_LOW },
- { "Tx Start Bit High", CEC_TIM_START_BIT_TOTAL - CEC_TIM_START_BIT_LOW },
- { "Tx Start Bit High Short", CEC_TIM_START_BIT_TOTAL_SHORT - CEC_TIM_START_BIT_LOW },
- { "Tx Start Bit High Long", CEC_TIM_START_BIT_TOTAL_LONG - CEC_TIM_START_BIT_LOW },
- { "Tx Start Bit Low Custom", 0 },
- { "Tx Start Bit High Custom", 0 },
- { "Tx Data 0 Low", CEC_TIM_DATA_BIT_0_LOW },
- { "Tx Data 0 High", CEC_TIM_DATA_BIT_TOTAL - CEC_TIM_DATA_BIT_0_LOW },
- { "Tx Data 0 High Short", CEC_TIM_DATA_BIT_TOTAL_SHORT - CEC_TIM_DATA_BIT_0_LOW },
- { "Tx Data 0 High Long", CEC_TIM_DATA_BIT_TOTAL_LONG - CEC_TIM_DATA_BIT_0_LOW },
- { "Tx Data 1 Low", CEC_TIM_DATA_BIT_1_LOW },
- { "Tx Data 1 High", CEC_TIM_DATA_BIT_TOTAL - CEC_TIM_DATA_BIT_1_LOW },
- { "Tx Data 1 High Short", CEC_TIM_DATA_BIT_TOTAL_SHORT - CEC_TIM_DATA_BIT_1_LOW },
- { "Tx Data 1 High Long", CEC_TIM_DATA_BIT_TOTAL_LONG - CEC_TIM_DATA_BIT_1_LOW },
- { "Tx Data 1 High Pre Sample", CEC_TIM_DATA_BIT_SAMPLE - CEC_TIM_DATA_BIT_1_LOW },
- { "Tx Data 1 High Post Sample", CEC_TIM_DATA_BIT_TOTAL - CEC_TIM_DATA_BIT_SAMPLE },
- { "Tx Data 1 High Post Sample Short", CEC_TIM_DATA_BIT_TOTAL_SHORT - CEC_TIM_DATA_BIT_SAMPLE },
- { "Tx Data 1 High Post Sample Long", CEC_TIM_DATA_BIT_TOTAL_LONG - CEC_TIM_DATA_BIT_SAMPLE },
- { "Tx Data Bit Low Custom", 0 },
- { "Tx Data Bit High Custom", 0 },
- { "Tx Pulse Low Custom", 0 },
- { "Tx Pulse High Custom", 0 },
- { "Tx Low Drive", CEC_TIM_LOW_DRIVE_ERROR },
- { "Rx Start Bit Low", CEC_TIM_SAMPLE },
- { "Rx Start Bit High", CEC_TIM_SAMPLE },
- { "Rx Data Sample", CEC_TIM_DATA_BIT_SAMPLE },
- { "Rx Data Post Sample", CEC_TIM_DATA_BIT_HIGH - CEC_TIM_DATA_BIT_SAMPLE },
- { "Rx Data Wait for Low", CEC_TIM_SAMPLE },
- { "Rx Ack Low", CEC_TIM_DATA_BIT_0_LOW },
- { "Rx Ack Low Post", CEC_TIM_DATA_BIT_HIGH - CEC_TIM_DATA_BIT_0_LOW },
- { "Rx Ack High Post", CEC_TIM_DATA_BIT_HIGH },
- { "Rx Ack Finish", CEC_TIM_DATA_BIT_TOTAL_MIN - CEC_TIM_DATA_BIT_HIGH },
- { "Rx Low Drive", CEC_TIM_LOW_DRIVE_ERROR },
- { "Rx Irq", 0 },
-};
-
-static void cec_pin_update(struct cec_pin *pin, bool v, bool force)
-{
- if (!force && v == pin->adap->cec_pin_is_high)
- return;
-
- pin->adap->cec_pin_is_high = v;
- if (atomic_read(&pin->work_pin_num_events) < CEC_NUM_PIN_EVENTS) {
- u8 ev = v;
-
- if (pin->work_pin_events_dropped) {
- pin->work_pin_events_dropped = false;
- ev |= CEC_PIN_EVENT_FL_DROPPED;
- }
- pin->work_pin_events[pin->work_pin_events_wr] = ev;
- pin->work_pin_ts[pin->work_pin_events_wr] = ktime_get();
- pin->work_pin_events_wr =
- (pin->work_pin_events_wr + 1) % CEC_NUM_PIN_EVENTS;
- atomic_inc(&pin->work_pin_num_events);
- } else {
- pin->work_pin_events_dropped = true;
- pin->work_pin_events_dropped_cnt++;
- }
- wake_up_interruptible(&pin->kthread_waitq);
-}
-
-static bool cec_pin_read(struct cec_pin *pin)
-{
- bool v = pin->ops->read(pin->adap);
-
- cec_pin_update(pin, v, false);
- return v;
-}
-
-static void cec_pin_low(struct cec_pin *pin)
-{
- pin->ops->low(pin->adap);
- cec_pin_update(pin, false, false);
-}
-
-static bool cec_pin_high(struct cec_pin *pin)
-{
- pin->ops->high(pin->adap);
- return cec_pin_read(pin);
-}
-
-static bool rx_error_inj(struct cec_pin *pin, unsigned int mode_offset,
- int arg_idx, u8 *arg)
-{
-#ifdef CONFIG_CEC_PIN_ERROR_INJ
- u16 cmd = cec_pin_rx_error_inj(pin);
- u64 e = pin->error_inj[cmd];
- unsigned int mode = (e >> mode_offset) & CEC_ERROR_INJ_MODE_MASK;
-
- if (arg_idx >= 0) {
- u8 pos = pin->error_inj_args[cmd][arg_idx];
-
- if (arg)
- *arg = pos;
- else if (pos != pin->rx_bit)
- return false;
- }
-
- switch (mode) {
- case CEC_ERROR_INJ_MODE_ONCE:
- pin->error_inj[cmd] &=
- ~(CEC_ERROR_INJ_MODE_MASK << mode_offset);
- return true;
- case CEC_ERROR_INJ_MODE_ALWAYS:
- return true;
- case CEC_ERROR_INJ_MODE_TOGGLE:
- return pin->rx_toggle;
- default:
- return false;
- }
-#else
- return false;
-#endif
-}
-
-static bool rx_nack(struct cec_pin *pin)
-{
- return rx_error_inj(pin, CEC_ERROR_INJ_RX_NACK_OFFSET, -1, NULL);
-}
-
-static bool rx_low_drive(struct cec_pin *pin)
-{
- return rx_error_inj(pin, CEC_ERROR_INJ_RX_LOW_DRIVE_OFFSET,
- CEC_ERROR_INJ_RX_LOW_DRIVE_ARG_IDX, NULL);
-}
-
-static bool rx_add_byte(struct cec_pin *pin)
-{
- return rx_error_inj(pin, CEC_ERROR_INJ_RX_ADD_BYTE_OFFSET, -1, NULL);
-}
-
-static bool rx_remove_byte(struct cec_pin *pin)
-{
- return rx_error_inj(pin, CEC_ERROR_INJ_RX_REMOVE_BYTE_OFFSET, -1, NULL);
-}
-
-static bool rx_arb_lost(struct cec_pin *pin, u8 *poll)
-{
- return pin->tx_msg.len == 0 &&
- rx_error_inj(pin, CEC_ERROR_INJ_RX_ARB_LOST_OFFSET,
- CEC_ERROR_INJ_RX_ARB_LOST_ARG_IDX, poll);
-}
-
-static bool tx_error_inj(struct cec_pin *pin, unsigned int mode_offset,
- int arg_idx, u8 *arg)
-{
-#ifdef CONFIG_CEC_PIN_ERROR_INJ
- u16 cmd = cec_pin_tx_error_inj(pin);
- u64 e = pin->error_inj[cmd];
- unsigned int mode = (e >> mode_offset) & CEC_ERROR_INJ_MODE_MASK;
-
- if (arg_idx >= 0) {
- u8 pos = pin->error_inj_args[cmd][arg_idx];
-
- if (arg)
- *arg = pos;
- else if (pos != pin->tx_bit)
- return false;
- }
-
- switch (mode) {
- case CEC_ERROR_INJ_MODE_ONCE:
- pin->error_inj[cmd] &=
- ~(CEC_ERROR_INJ_MODE_MASK << mode_offset);
- return true;
- case CEC_ERROR_INJ_MODE_ALWAYS:
- return true;
- case CEC_ERROR_INJ_MODE_TOGGLE:
- return pin->tx_toggle;
- default:
- return false;
- }
-#else
- return false;
-#endif
-}
-
-static bool tx_no_eom(struct cec_pin *pin)
-{
- return tx_error_inj(pin, CEC_ERROR_INJ_TX_NO_EOM_OFFSET, -1, NULL);
-}
-
-static bool tx_early_eom(struct cec_pin *pin)
-{
- return tx_error_inj(pin, CEC_ERROR_INJ_TX_EARLY_EOM_OFFSET, -1, NULL);
-}
-
-static bool tx_short_bit(struct cec_pin *pin)
-{
- return tx_error_inj(pin, CEC_ERROR_INJ_TX_SHORT_BIT_OFFSET,
- CEC_ERROR_INJ_TX_SHORT_BIT_ARG_IDX, NULL);
-}
-
-static bool tx_long_bit(struct cec_pin *pin)
-{
- return tx_error_inj(pin, CEC_ERROR_INJ_TX_LONG_BIT_OFFSET,
- CEC_ERROR_INJ_TX_LONG_BIT_ARG_IDX, NULL);
-}
-
-static bool tx_custom_bit(struct cec_pin *pin)
-{
- return tx_error_inj(pin, CEC_ERROR_INJ_TX_CUSTOM_BIT_OFFSET,
- CEC_ERROR_INJ_TX_CUSTOM_BIT_ARG_IDX, NULL);
-}
-
-static bool tx_short_start(struct cec_pin *pin)
-{
- return tx_error_inj(pin, CEC_ERROR_INJ_TX_SHORT_START_OFFSET, -1, NULL);
-}
-
-static bool tx_long_start(struct cec_pin *pin)
-{
- return tx_error_inj(pin, CEC_ERROR_INJ_TX_LONG_START_OFFSET, -1, NULL);
-}
-
-static bool tx_custom_start(struct cec_pin *pin)
-{
- return tx_error_inj(pin, CEC_ERROR_INJ_TX_CUSTOM_START_OFFSET,
- -1, NULL);
-}
-
-static bool tx_last_bit(struct cec_pin *pin)
-{
- return tx_error_inj(pin, CEC_ERROR_INJ_TX_LAST_BIT_OFFSET,
- CEC_ERROR_INJ_TX_LAST_BIT_ARG_IDX, NULL);
-}
-
-static u8 tx_add_bytes(struct cec_pin *pin)
-{
- u8 bytes;
-
- if (tx_error_inj(pin, CEC_ERROR_INJ_TX_ADD_BYTES_OFFSET,
- CEC_ERROR_INJ_TX_ADD_BYTES_ARG_IDX, &bytes))
- return bytes;
- return 0;
-}
-
-static bool tx_remove_byte(struct cec_pin *pin)
-{
- return tx_error_inj(pin, CEC_ERROR_INJ_TX_REMOVE_BYTE_OFFSET, -1, NULL);
-}
-
-static bool tx_low_drive(struct cec_pin *pin)
-{
- return tx_error_inj(pin, CEC_ERROR_INJ_TX_LOW_DRIVE_OFFSET,
- CEC_ERROR_INJ_TX_LOW_DRIVE_ARG_IDX, NULL);
-}
-
-static void cec_pin_to_idle(struct cec_pin *pin)
-{
- /*
- * Reset all status fields, release the bus and
- * go to idle state.
- */
- pin->rx_bit = pin->tx_bit = 0;
- pin->rx_msg.len = 0;
- memset(pin->rx_msg.msg, 0, sizeof(pin->rx_msg.msg));
- pin->ts = ns_to_ktime(0);
- pin->tx_generated_poll = false;
- pin->tx_post_eom = false;
- if (pin->state >= CEC_ST_TX_WAIT &&
- pin->state <= CEC_ST_TX_LOW_DRIVE)
- pin->tx_toggle ^= 1;
- if (pin->state >= CEC_ST_RX_START_BIT_LOW &&
- pin->state <= CEC_ST_RX_LOW_DRIVE)
- pin->rx_toggle ^= 1;
- pin->state = CEC_ST_IDLE;
-}
-
-/*
- * Handle Transmit-related states
- *
- * Basic state changes when transmitting:
- *
- * Idle -> Tx Wait (waiting for the end of signal free time) ->
- * Tx Start Bit Low -> Tx Start Bit High ->
- *
- * Regular data bits + EOM:
- * Tx Data 0 Low -> Tx Data 0 High ->
- * or:
- * Tx Data 1 Low -> Tx Data 1 High ->
- *
- * First 4 data bits or Ack bit:
- * Tx Data 0 Low -> Tx Data 0 High ->
- * or:
- * Tx Data 1 Low -> Tx Data 1 High -> Tx Data 1 Pre Sample ->
- * Tx Data 1 Post Sample ->
- *
- * After the last Ack go to Idle.
- *
- * If it detects a Low Drive condition then:
- * Tx Wait For High -> Idle
- *
- * If it loses arbitration, then it switches to state Rx Data Post Sample.
- */
-static void cec_pin_tx_states(struct cec_pin *pin, ktime_t ts)
-{
- bool v;
- bool is_ack_bit, ack;
-
- switch (pin->state) {
- case CEC_ST_TX_WAIT_FOR_HIGH:
- if (cec_pin_read(pin))
- cec_pin_to_idle(pin);
- break;
-
- case CEC_ST_TX_START_BIT_LOW:
- if (tx_short_start(pin)) {
- /*
- * Error Injection: send an invalid (too short)
- * start pulse.
- */
- pin->state = CEC_ST_TX_START_BIT_HIGH_SHORT;
- } else if (tx_long_start(pin)) {
- /*
- * Error Injection: send an invalid (too long)
- * start pulse.
- */
- pin->state = CEC_ST_TX_START_BIT_HIGH_LONG;
- } else {
- pin->state = CEC_ST_TX_START_BIT_HIGH;
- }
- /* Generate start bit */
- cec_pin_high(pin);
- break;
-
- case CEC_ST_TX_START_BIT_LOW_CUSTOM:
- pin->state = CEC_ST_TX_START_BIT_HIGH_CUSTOM;
- /* Generate start bit */
- cec_pin_high(pin);
- break;
-
- case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE:
- case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_SHORT:
- case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_LONG:
- if (pin->tx_nacked) {
- cec_pin_to_idle(pin);
- pin->tx_msg.len = 0;
- if (pin->tx_generated_poll)
- break;
- pin->work_tx_ts = ts;
- pin->work_tx_status = CEC_TX_STATUS_NACK;
- wake_up_interruptible(&pin->kthread_waitq);
- break;
- }
- /* fall through */
- case CEC_ST_TX_DATA_BIT_0_HIGH:
- case CEC_ST_TX_DATA_BIT_0_HIGH_SHORT:
- case CEC_ST_TX_DATA_BIT_0_HIGH_LONG:
- case CEC_ST_TX_DATA_BIT_1_HIGH:
- case CEC_ST_TX_DATA_BIT_1_HIGH_SHORT:
- case CEC_ST_TX_DATA_BIT_1_HIGH_LONG:
- /*
- * If the read value is 1, then all is OK, otherwise we have a
- * low drive condition.
- *
- * Special case: when we generate a poll message due to an
- * Arbitration Lost error injection, then ignore this since
- * the pin can actually be low in that case.
- */
- if (!cec_pin_read(pin) && !pin->tx_generated_poll) {
- /*
- * It's 0, so someone detected an error and pulled the
- * line low for 1.5 times the nominal bit period.
- */
- pin->tx_msg.len = 0;
- pin->state = CEC_ST_TX_WAIT_FOR_HIGH;
- pin->work_tx_ts = ts;
- pin->work_tx_status = CEC_TX_STATUS_LOW_DRIVE;
- pin->tx_low_drive_cnt++;
- wake_up_interruptible(&pin->kthread_waitq);
- break;
- }
- /* fall through */
- case CEC_ST_TX_DATA_BIT_HIGH_CUSTOM:
- if (tx_last_bit(pin)) {
- /* Error Injection: just stop sending after this bit */
- cec_pin_to_idle(pin);
- pin->tx_msg.len = 0;
- if (pin->tx_generated_poll)
- break;
- pin->work_tx_ts = ts;
- pin->work_tx_status = CEC_TX_STATUS_OK;
- wake_up_interruptible(&pin->kthread_waitq);
- break;
- }
- pin->tx_bit++;
- /* fall through */
- case CEC_ST_TX_START_BIT_HIGH:
- case CEC_ST_TX_START_BIT_HIGH_SHORT:
- case CEC_ST_TX_START_BIT_HIGH_LONG:
- case CEC_ST_TX_START_BIT_HIGH_CUSTOM:
- if (tx_low_drive(pin)) {
- /* Error injection: go to low drive */
- cec_pin_low(pin);
- pin->state = CEC_ST_TX_LOW_DRIVE;
- pin->tx_msg.len = 0;
- if (pin->tx_generated_poll)
- break;
- pin->work_tx_ts = ts;
- pin->work_tx_status = CEC_TX_STATUS_LOW_DRIVE;
- pin->tx_low_drive_cnt++;
- wake_up_interruptible(&pin->kthread_waitq);
- break;
- }
- if (pin->tx_bit / 10 >= pin->tx_msg.len + pin->tx_extra_bytes) {
- cec_pin_to_idle(pin);
- pin->tx_msg.len = 0;
- if (pin->tx_generated_poll)
- break;
- pin->work_tx_ts = ts;
- pin->work_tx_status = CEC_TX_STATUS_OK;
- wake_up_interruptible(&pin->kthread_waitq);
- break;
- }
-
- switch (pin->tx_bit % 10) {
- default: {
- /*
- * In the CEC_ERROR_INJ_TX_ADD_BYTES case we transmit
- * extra bytes, so pin->tx_bit / 10 can become >= 16.
- * Generate bit values for those extra bytes instead
- * of reading them from the transmit buffer.
- */
- unsigned int idx = (pin->tx_bit / 10);
- u8 val = idx;
-
- if (idx < pin->tx_msg.len)
- val = pin->tx_msg.msg[idx];
- v = val & (1 << (7 - (pin->tx_bit % 10)));
-
- pin->state = v ? CEC_ST_TX_DATA_BIT_1_LOW :
- CEC_ST_TX_DATA_BIT_0_LOW;
- break;
- }
- case EOM_BIT: {
- unsigned int tot_len = pin->tx_msg.len +
- pin->tx_extra_bytes;
- unsigned int tx_byte_idx = pin->tx_bit / 10;
-
- v = !pin->tx_post_eom && tx_byte_idx == tot_len - 1;
- if (tot_len > 1 && tx_byte_idx == tot_len - 2 &&
- tx_early_eom(pin)) {
- /* Error injection: set EOM one byte early */
- v = true;
- pin->tx_post_eom = true;
- } else if (v && tx_no_eom(pin)) {
- /* Error injection: no EOM */
- v = false;
- }
- pin->state = v ? CEC_ST_TX_DATA_BIT_1_LOW :
- CEC_ST_TX_DATA_BIT_0_LOW;
- break;
- }
- case ACK_BIT:
- pin->state = CEC_ST_TX_DATA_BIT_1_LOW;
- break;
- }
- if (tx_custom_bit(pin))
- pin->state = CEC_ST_TX_DATA_BIT_LOW_CUSTOM;
- cec_pin_low(pin);
- break;
-
- case CEC_ST_TX_DATA_BIT_0_LOW:
- case CEC_ST_TX_DATA_BIT_1_LOW:
- v = pin->state == CEC_ST_TX_DATA_BIT_1_LOW;
- is_ack_bit = pin->tx_bit % 10 == ACK_BIT;
- if (v && (pin->tx_bit < 4 || is_ack_bit)) {
- pin->state = CEC_ST_TX_DATA_BIT_1_HIGH_PRE_SAMPLE;
- } else if (!is_ack_bit && tx_short_bit(pin)) {
- /* Error Injection: send an invalid (too short) bit */
- pin->state = v ? CEC_ST_TX_DATA_BIT_1_HIGH_SHORT :
- CEC_ST_TX_DATA_BIT_0_HIGH_SHORT;
- } else if (!is_ack_bit && tx_long_bit(pin)) {
- /* Error Injection: send an invalid (too long) bit */
- pin->state = v ? CEC_ST_TX_DATA_BIT_1_HIGH_LONG :
- CEC_ST_TX_DATA_BIT_0_HIGH_LONG;
- } else {
- pin->state = v ? CEC_ST_TX_DATA_BIT_1_HIGH :
- CEC_ST_TX_DATA_BIT_0_HIGH;
- }
- cec_pin_high(pin);
- break;
-
- case CEC_ST_TX_DATA_BIT_LOW_CUSTOM:
- pin->state = CEC_ST_TX_DATA_BIT_HIGH_CUSTOM;
- cec_pin_high(pin);
- break;
-
- case CEC_ST_TX_DATA_BIT_1_HIGH_PRE_SAMPLE:
- /* Read the CEC value at the sample time */
- v = cec_pin_read(pin);
- is_ack_bit = pin->tx_bit % 10 == ACK_BIT;
- /*
- * If v == 0 and we're within the first 4 bits
- * of the initiator, then someone else started
- * transmitting and we lost the arbitration
- * (i.e. the logical address of the other
- * transmitter has more leading 0 bits in the
- * initiator).
- */
- if (!v && !is_ack_bit && !pin->tx_generated_poll) {
- pin->tx_msg.len = 0;
- pin->work_tx_ts = ts;
- pin->work_tx_status = CEC_TX_STATUS_ARB_LOST;
- wake_up_interruptible(&pin->kthread_waitq);
- pin->rx_bit = pin->tx_bit;
- pin->tx_bit = 0;
- memset(pin->rx_msg.msg, 0, sizeof(pin->rx_msg.msg));
- pin->rx_msg.msg[0] = pin->tx_msg.msg[0];
- pin->rx_msg.msg[0] &= (0xff << (8 - pin->rx_bit));
- pin->rx_msg.len = 0;
- pin->ts = ktime_sub_us(ts, CEC_TIM_DATA_BIT_SAMPLE);
- pin->state = CEC_ST_RX_DATA_POST_SAMPLE;
- pin->rx_bit++;
- break;
- }
- pin->state = CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE;
- if (!is_ack_bit && tx_short_bit(pin)) {
- /* Error Injection: send an invalid (too short) bit */
- pin->state = CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_SHORT;
- } else if (!is_ack_bit && tx_long_bit(pin)) {
- /* Error Injection: send an invalid (too long) bit */
- pin->state = CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_LONG;
- }
- if (!is_ack_bit)
- break;
- /* Was the message ACKed? */
- ack = cec_msg_is_broadcast(&pin->tx_msg) ? v : !v;
- if (!ack && (!pin->tx_ignore_nack_until_eom ||
- pin->tx_bit / 10 == pin->tx_msg.len - 1) &&
- !pin->tx_post_eom) {
- /*
- * Note: the CEC spec is ambiguous regarding
- * what action to take when a NACK appears
- * before the last byte of the payload was
- * transmitted: either stop transmitting
- * immediately, or wait until the last byte
- * was transmitted.
- *
- * Most CEC implementations appear to stop
- * immediately, and that's what we do here
- * as well.
- */
- pin->tx_nacked = true;
- }
- break;
-
- case CEC_ST_TX_PULSE_LOW_CUSTOM:
- cec_pin_high(pin);
- pin->state = CEC_ST_TX_PULSE_HIGH_CUSTOM;
- break;
-
- case CEC_ST_TX_PULSE_HIGH_CUSTOM:
- cec_pin_to_idle(pin);
- break;
-
- default:
- break;
- }
-}
-
-/*
- * Handle Receive-related states
- *
- * Basic state changes when receiving:
- *
- * Rx Start Bit Low -> Rx Start Bit High ->
- * Regular data bits + EOM:
- * Rx Data Sample -> Rx Data Post Sample -> Rx Data High ->
- * Ack bit 0:
- * Rx Ack Low -> Rx Ack Low Post -> Rx Data High ->
- * Ack bit 1:
- * Rx Ack High Post -> Rx Data High ->
- * Ack bit 0 && EOM:
- * Rx Ack Low -> Rx Ack Low Post -> Rx Ack Finish -> Idle
- */
-static void cec_pin_rx_states(struct cec_pin *pin, ktime_t ts)
-{
- s32 delta;
- bool v;
- bool ack;
- bool bcast, for_us;
- u8 dest;
- u8 poll;
-
- switch (pin->state) {
- /* Receive states */
- case CEC_ST_RX_START_BIT_LOW:
- v = cec_pin_read(pin);
- if (!v)
- break;
- pin->state = CEC_ST_RX_START_BIT_HIGH;
- delta = ktime_us_delta(ts, pin->ts);
- /* Start bit low is too short, go back to idle */
- if (delta < CEC_TIM_START_BIT_LOW_MIN - CEC_TIM_IDLE_SAMPLE) {
- if (!pin->rx_start_bit_low_too_short_cnt++) {
- pin->rx_start_bit_low_too_short_ts = ktime_to_ns(pin->ts);
- pin->rx_start_bit_low_too_short_delta = delta;
- }
- cec_pin_to_idle(pin);
- break;
- }
- if (rx_arb_lost(pin, &poll)) {
- cec_msg_init(&pin->tx_msg, poll >> 4, poll & 0xf);
- pin->tx_generated_poll = true;
- pin->tx_extra_bytes = 0;
- pin->state = CEC_ST_TX_START_BIT_HIGH;
- pin->ts = ts;
- }
- break;
-
- case CEC_ST_RX_START_BIT_HIGH:
- v = cec_pin_read(pin);
- delta = ktime_us_delta(ts, pin->ts);
- /*
- * Unfortunately the spec does not specify when to give up
- * and go to idle. We just pick TOTAL_LONG.
- */
- if (v && delta > CEC_TIM_START_BIT_TOTAL_LONG) {
- pin->rx_start_bit_too_long_cnt++;
- cec_pin_to_idle(pin);
- break;
- }
- if (v)
- break;
- /* Start bit is too short, go back to idle */
- if (delta < CEC_TIM_START_BIT_TOTAL_MIN - CEC_TIM_IDLE_SAMPLE) {
- if (!pin->rx_start_bit_too_short_cnt++) {
- pin->rx_start_bit_too_short_ts = ktime_to_ns(pin->ts);
- pin->rx_start_bit_too_short_delta = delta;
- }
- cec_pin_to_idle(pin);
- break;
- }
- if (rx_low_drive(pin)) {
- /* Error injection: go to low drive */
- cec_pin_low(pin);
- pin->state = CEC_ST_RX_LOW_DRIVE;
- pin->rx_low_drive_cnt++;
- break;
- }
- pin->state = CEC_ST_RX_DATA_SAMPLE;
- pin->ts = ts;
- pin->rx_eom = false;
- break;
-
- case CEC_ST_RX_DATA_SAMPLE:
- v = cec_pin_read(pin);
- pin->state = CEC_ST_RX_DATA_POST_SAMPLE;
- switch (pin->rx_bit % 10) {
- default:
- if (pin->rx_bit / 10 < CEC_MAX_MSG_SIZE)
- pin->rx_msg.msg[pin->rx_bit / 10] |=
- v << (7 - (pin->rx_bit % 10));
- break;
- case EOM_BIT:
- pin->rx_eom = v;
- pin->rx_msg.len = pin->rx_bit / 10 + 1;
- break;
- case ACK_BIT:
- break;
- }
- pin->rx_bit++;
- break;
-
- case CEC_ST_RX_DATA_POST_SAMPLE:
- pin->state = CEC_ST_RX_DATA_WAIT_FOR_LOW;
- break;
-
- case CEC_ST_RX_DATA_WAIT_FOR_LOW:
- v = cec_pin_read(pin);
- delta = ktime_us_delta(ts, pin->ts);
- /*
- * Unfortunately the spec does not specify when to give up
- * and go to idle. We just pick TOTAL_LONG.
- */
- if (v && delta > CEC_TIM_DATA_BIT_TOTAL_LONG) {
- pin->rx_data_bit_too_long_cnt++;
- cec_pin_to_idle(pin);
- break;
- }
- if (v)
- break;
-
- if (rx_low_drive(pin)) {
- /* Error injection: go to low drive */
- cec_pin_low(pin);
- pin->state = CEC_ST_RX_LOW_DRIVE;
- pin->rx_low_drive_cnt++;
- break;
- }
-
- /*
- * Go to low drive state when the total bit time is
- * too short.
- */
- if (delta < CEC_TIM_DATA_BIT_TOTAL_MIN) {
- if (!pin->rx_data_bit_too_short_cnt++) {
- pin->rx_data_bit_too_short_ts = ktime_to_ns(pin->ts);
- pin->rx_data_bit_too_short_delta = delta;
- }
- cec_pin_low(pin);
- pin->state = CEC_ST_RX_LOW_DRIVE;
- pin->rx_low_drive_cnt++;
- break;
- }
- pin->ts = ts;
- if (pin->rx_bit % 10 != 9) {
- pin->state = CEC_ST_RX_DATA_SAMPLE;
- break;
- }
-
- dest = cec_msg_destination(&pin->rx_msg);
- bcast = dest == CEC_LOG_ADDR_BROADCAST;
- /* for_us == broadcast or directed to us */
- for_us = bcast || (pin->la_mask & (1 << dest));
- /* ACK bit value */
- ack = bcast ? 1 : !for_us;
-
- if (for_us && rx_nack(pin)) {
- /* Error injection: toggle the ACK bit */
- ack = !ack;
- }
-
- if (ack) {
- /* No need to write to the bus, just wait */
- pin->state = CEC_ST_RX_ACK_HIGH_POST;
- break;
- }
- cec_pin_low(pin);
- pin->state = CEC_ST_RX_ACK_LOW;
- break;
-
- case CEC_ST_RX_ACK_LOW:
- cec_pin_high(pin);
- pin->state = CEC_ST_RX_ACK_LOW_POST;
- break;
-
- case CEC_ST_RX_ACK_LOW_POST:
- case CEC_ST_RX_ACK_HIGH_POST:
- v = cec_pin_read(pin);
- if (v && pin->rx_eom) {
- pin->work_rx_msg = pin->rx_msg;
- pin->work_rx_msg.rx_ts = ktime_to_ns(ts);
- wake_up_interruptible(&pin->kthread_waitq);
- pin->ts = ts;
- pin->state = CEC_ST_RX_ACK_FINISH;
- break;
- }
- pin->rx_bit++;
- pin->state = CEC_ST_RX_DATA_WAIT_FOR_LOW;
- break;
-
- case CEC_ST_RX_ACK_FINISH:
- cec_pin_to_idle(pin);
- break;
-
- default:
- break;
- }
-}
-
-/*
- * Main timer function
- *
- */
-static enum hrtimer_restart cec_pin_timer(struct hrtimer *timer)
-{
- struct cec_pin *pin = container_of(timer, struct cec_pin, timer);
- struct cec_adapter *adap = pin->adap;
- ktime_t ts;
- s32 delta;
- u32 usecs;
-
- ts = ktime_get();
- if (ktime_to_ns(pin->timer_ts)) {
- delta = ktime_us_delta(ts, pin->timer_ts);
- pin->timer_cnt++;
- if (delta > 100 && pin->state != CEC_ST_IDLE) {
- /* Keep track of timer overruns */
- pin->timer_sum_overrun += delta;
- pin->timer_100ms_overruns++;
- if (delta > 300)
- pin->timer_300ms_overruns++;
- if (delta > pin->timer_max_overrun)
- pin->timer_max_overrun = delta;
- }
- }
- if (adap->monitor_pin_cnt)
- cec_pin_read(pin);
-
- if (pin->wait_usecs) {
- /*
- * If we are monitoring the pin, then we have to
- * sample at regular intervals.
- */
- if (pin->wait_usecs > 150) {
- pin->wait_usecs -= 100;
- pin->timer_ts = ktime_add_us(ts, 100);
- hrtimer_forward_now(timer, ns_to_ktime(100000));
- return HRTIMER_RESTART;
- }
- if (pin->wait_usecs > 100) {
- pin->wait_usecs /= 2;
- pin->timer_ts = ktime_add_us(ts, pin->wait_usecs);
- hrtimer_forward_now(timer,
- ns_to_ktime(pin->wait_usecs * 1000));
- return HRTIMER_RESTART;
- }
- pin->timer_ts = ktime_add_us(ts, pin->wait_usecs);
- hrtimer_forward_now(timer,
- ns_to_ktime(pin->wait_usecs * 1000));
- pin->wait_usecs = 0;
- return HRTIMER_RESTART;
- }
-
- switch (pin->state) {
- /* Transmit states */
- case CEC_ST_TX_WAIT_FOR_HIGH:
- case CEC_ST_TX_START_BIT_LOW:
- case CEC_ST_TX_START_BIT_HIGH:
- case CEC_ST_TX_START_BIT_HIGH_SHORT:
- case CEC_ST_TX_START_BIT_HIGH_LONG:
- case CEC_ST_TX_START_BIT_LOW_CUSTOM:
- case CEC_ST_TX_START_BIT_HIGH_CUSTOM:
- case CEC_ST_TX_DATA_BIT_0_LOW:
- case CEC_ST_TX_DATA_BIT_0_HIGH:
- case CEC_ST_TX_DATA_BIT_0_HIGH_SHORT:
- case CEC_ST_TX_DATA_BIT_0_HIGH_LONG:
- case CEC_ST_TX_DATA_BIT_1_LOW:
- case CEC_ST_TX_DATA_BIT_1_HIGH:
- case CEC_ST_TX_DATA_BIT_1_HIGH_SHORT:
- case CEC_ST_TX_DATA_BIT_1_HIGH_LONG:
- case CEC_ST_TX_DATA_BIT_1_HIGH_PRE_SAMPLE:
- case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE:
- case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_SHORT:
- case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_LONG:
- case CEC_ST_TX_DATA_BIT_LOW_CUSTOM:
- case CEC_ST_TX_DATA_BIT_HIGH_CUSTOM:
- case CEC_ST_TX_PULSE_LOW_CUSTOM:
- case CEC_ST_TX_PULSE_HIGH_CUSTOM:
- cec_pin_tx_states(pin, ts);
- break;
-
- /* Receive states */
- case CEC_ST_RX_START_BIT_LOW:
- case CEC_ST_RX_START_BIT_HIGH:
- case CEC_ST_RX_DATA_SAMPLE:
- case CEC_ST_RX_DATA_POST_SAMPLE:
- case CEC_ST_RX_DATA_WAIT_FOR_LOW:
- case CEC_ST_RX_ACK_LOW:
- case CEC_ST_RX_ACK_LOW_POST:
- case CEC_ST_RX_ACK_HIGH_POST:
- case CEC_ST_RX_ACK_FINISH:
- cec_pin_rx_states(pin, ts);
- break;
-
- case CEC_ST_IDLE:
- case CEC_ST_TX_WAIT:
- if (!cec_pin_high(pin)) {
- /* Start bit, switch to receive state */
- pin->ts = ts;
- pin->state = CEC_ST_RX_START_BIT_LOW;
- /*
- * If a transmit is pending, then that transmit should
- * use a signal free time of no more than
- * CEC_SIGNAL_FREE_TIME_NEW_INITIATOR since it will
- * have a new initiator due to the receive that is now
- * starting.
- */
- if (pin->tx_msg.len && pin->tx_signal_free_time >
- CEC_SIGNAL_FREE_TIME_NEW_INITIATOR)
- pin->tx_signal_free_time =
- CEC_SIGNAL_FREE_TIME_NEW_INITIATOR;
- break;
- }
- if (ktime_to_ns(pin->ts) == 0)
- pin->ts = ts;
- if (pin->tx_msg.len) {
- /*
- * Check if the bus has been free for long enough
- * so we can kick off the pending transmit.
- */
- delta = ktime_us_delta(ts, pin->ts);
- if (delta / CEC_TIM_DATA_BIT_TOTAL >
- pin->tx_signal_free_time) {
- pin->tx_nacked = false;
- if (tx_custom_start(pin))
- pin->state = CEC_ST_TX_START_BIT_LOW_CUSTOM;
- else
- pin->state = CEC_ST_TX_START_BIT_LOW;
- /* Generate start bit */
- cec_pin_low(pin);
- break;
- }
- if (delta / CEC_TIM_DATA_BIT_TOTAL >
- pin->tx_signal_free_time - 1)
- pin->state = CEC_ST_TX_WAIT;
- break;
- }
- if (pin->tx_custom_pulse && pin->state == CEC_ST_IDLE) {
- pin->tx_custom_pulse = false;
- /* Generate custom pulse */
- cec_pin_low(pin);
- pin->state = CEC_ST_TX_PULSE_LOW_CUSTOM;
- break;
- }
- if (pin->state != CEC_ST_IDLE || pin->ops->enable_irq == NULL ||
- pin->enable_irq_failed || adap->is_configuring ||
- adap->is_configured || adap->monitor_all_cnt)
- break;
- /* Switch to interrupt mode */
- atomic_set(&pin->work_irq_change, CEC_PIN_IRQ_ENABLE);
- pin->state = CEC_ST_RX_IRQ;
- wake_up_interruptible(&pin->kthread_waitq);
- return HRTIMER_NORESTART;
-
- case CEC_ST_TX_LOW_DRIVE:
- case CEC_ST_RX_LOW_DRIVE:
- cec_pin_high(pin);
- cec_pin_to_idle(pin);
- break;
-
- default:
- break;
- }
-
- switch (pin->state) {
- case CEC_ST_TX_START_BIT_LOW_CUSTOM:
- case CEC_ST_TX_DATA_BIT_LOW_CUSTOM:
- case CEC_ST_TX_PULSE_LOW_CUSTOM:
- usecs = pin->tx_custom_low_usecs;
- break;
- case CEC_ST_TX_START_BIT_HIGH_CUSTOM:
- case CEC_ST_TX_DATA_BIT_HIGH_CUSTOM:
- case CEC_ST_TX_PULSE_HIGH_CUSTOM:
- usecs = pin->tx_custom_high_usecs;
- break;
- default:
- usecs = states[pin->state].usecs;
- break;
- }
-
- if (!adap->monitor_pin_cnt || usecs <= 150) {
- pin->wait_usecs = 0;
- pin->timer_ts = ktime_add_us(ts, usecs);
- hrtimer_forward_now(timer,
- ns_to_ktime(usecs * 1000));
- return HRTIMER_RESTART;
- }
- pin->wait_usecs = usecs - 100;
- pin->timer_ts = ktime_add_us(ts, 100);
- hrtimer_forward_now(timer, ns_to_ktime(100000));
- return HRTIMER_RESTART;
-}
-
-static int cec_pin_thread_func(void *_adap)
-{
- struct cec_adapter *adap = _adap;
- struct cec_pin *pin = adap->pin;
-
- for (;;) {
- wait_event_interruptible(pin->kthread_waitq,
- kthread_should_stop() ||
- pin->work_rx_msg.len ||
- pin->work_tx_status ||
- atomic_read(&pin->work_irq_change) ||
- atomic_read(&pin->work_pin_num_events));
-
- if (pin->work_rx_msg.len) {
- struct cec_msg *msg = &pin->work_rx_msg;
-
- if (msg->len > 1 && msg->len < CEC_MAX_MSG_SIZE &&
- rx_add_byte(pin)) {
- /* Error injection: add byte to the message */
- msg->msg[msg->len++] = 0x55;
- }
- if (msg->len > 2 && rx_remove_byte(pin)) {
- /* Error injection: remove byte from message */
- msg->len--;
- }
- if (msg->len > CEC_MAX_MSG_SIZE)
- msg->len = CEC_MAX_MSG_SIZE;
- cec_received_msg_ts(adap, msg,
- ns_to_ktime(pin->work_rx_msg.rx_ts));
- msg->len = 0;
- }
- if (pin->work_tx_status) {
- unsigned int tx_status = pin->work_tx_status;
-
- pin->work_tx_status = 0;
- cec_transmit_attempt_done_ts(adap, tx_status,
- pin->work_tx_ts);
- }
-
- while (atomic_read(&pin->work_pin_num_events)) {
- unsigned int idx = pin->work_pin_events_rd;
- u8 v = pin->work_pin_events[idx];
-
- cec_queue_pin_cec_event(adap,
- v & CEC_PIN_EVENT_FL_IS_HIGH,
- v & CEC_PIN_EVENT_FL_DROPPED,
- pin->work_pin_ts[idx]);
- pin->work_pin_events_rd = (idx + 1) % CEC_NUM_PIN_EVENTS;
- atomic_dec(&pin->work_pin_num_events);
- }
-
- switch (atomic_xchg(&pin->work_irq_change,
- CEC_PIN_IRQ_UNCHANGED)) {
- case CEC_PIN_IRQ_DISABLE:
- pin->ops->disable_irq(adap);
- cec_pin_high(pin);
- cec_pin_to_idle(pin);
- hrtimer_start(&pin->timer, ns_to_ktime(0),
- HRTIMER_MODE_REL);
- break;
- case CEC_PIN_IRQ_ENABLE:
- pin->enable_irq_failed = !pin->ops->enable_irq(adap);
- if (pin->enable_irq_failed) {
- cec_pin_to_idle(pin);
- hrtimer_start(&pin->timer, ns_to_ktime(0),
- HRTIMER_MODE_REL);
- }
- break;
- default:
- break;
- }
-
- if (kthread_should_stop())
- break;
- }
- return 0;
-}
-
-static int cec_pin_adap_enable(struct cec_adapter *adap, bool enable)
-{
- struct cec_pin *pin = adap->pin;
-
- pin->enabled = enable;
- if (enable) {
- atomic_set(&pin->work_pin_num_events, 0);
- pin->work_pin_events_rd = pin->work_pin_events_wr = 0;
- pin->work_pin_events_dropped = false;
- cec_pin_read(pin);
- cec_pin_to_idle(pin);
- pin->tx_msg.len = 0;
- pin->timer_ts = ns_to_ktime(0);
- atomic_set(&pin->work_irq_change, CEC_PIN_IRQ_UNCHANGED);
- pin->kthread = kthread_run(cec_pin_thread_func, adap,
- "cec-pin");
- if (IS_ERR(pin->kthread)) {
- pr_err("cec-pin: kernel_thread() failed\n");
- return PTR_ERR(pin->kthread);
- }
- hrtimer_start(&pin->timer, ns_to_ktime(0),
- HRTIMER_MODE_REL);
- } else {
- if (pin->ops->disable_irq)
- pin->ops->disable_irq(adap);
- hrtimer_cancel(&pin->timer);
- kthread_stop(pin->kthread);
- cec_pin_read(pin);
- cec_pin_to_idle(pin);
- pin->state = CEC_ST_OFF;
- }
- return 0;
-}
-
-static int cec_pin_adap_log_addr(struct cec_adapter *adap, u8 log_addr)
-{
- struct cec_pin *pin = adap->pin;
-
- if (log_addr == CEC_LOG_ADDR_INVALID)
- pin->la_mask = 0;
- else
- pin->la_mask |= (1 << log_addr);
- return 0;
-}
-
-void cec_pin_start_timer(struct cec_pin *pin)
-{
- if (pin->state != CEC_ST_RX_IRQ)
- return;
-
- atomic_set(&pin->work_irq_change, CEC_PIN_IRQ_UNCHANGED);
- pin->ops->disable_irq(pin->adap);
- cec_pin_high(pin);
- cec_pin_to_idle(pin);
- hrtimer_start(&pin->timer, ns_to_ktime(0), HRTIMER_MODE_REL);
-}
-
-static int cec_pin_adap_transmit(struct cec_adapter *adap, u8 attempts,
- u32 signal_free_time, struct cec_msg *msg)
-{
- struct cec_pin *pin = adap->pin;
-
- /*
- * If a receive is in progress, then this transmit should use
- * a signal free time of max CEC_SIGNAL_FREE_TIME_NEW_INITIATOR
- * since when it starts transmitting it will have a new initiator.
- */
- if (pin->state != CEC_ST_IDLE &&
- signal_free_time > CEC_SIGNAL_FREE_TIME_NEW_INITIATOR)
- signal_free_time = CEC_SIGNAL_FREE_TIME_NEW_INITIATOR;
-
- pin->tx_signal_free_time = signal_free_time;
- pin->tx_extra_bytes = 0;
- pin->tx_msg = *msg;
- if (msg->len > 1) {
- /* Error injection: add byte to the message */
- pin->tx_extra_bytes = tx_add_bytes(pin);
- }
- if (msg->len > 2 && tx_remove_byte(pin)) {
- /* Error injection: remove byte from the message */
- pin->tx_msg.len--;
- }
- pin->work_tx_status = 0;
- pin->tx_bit = 0;
- cec_pin_start_timer(pin);
- return 0;
-}
-
-static void cec_pin_adap_status(struct cec_adapter *adap,
- struct seq_file *file)
-{
- struct cec_pin *pin = adap->pin;
-
- seq_printf(file, "state: %s\n", states[pin->state].name);
- seq_printf(file, "tx_bit: %d\n", pin->tx_bit);
- seq_printf(file, "rx_bit: %d\n", pin->rx_bit);
- seq_printf(file, "cec pin: %d\n", pin->ops->read(adap));
- seq_printf(file, "cec pin events dropped: %u\n",
- pin->work_pin_events_dropped_cnt);
- seq_printf(file, "irq failed: %d\n", pin->enable_irq_failed);
- if (pin->timer_100ms_overruns) {
- seq_printf(file, "timer overruns > 100ms: %u of %u\n",
- pin->timer_100ms_overruns, pin->timer_cnt);
- seq_printf(file, "timer overruns > 300ms: %u of %u\n",
- pin->timer_300ms_overruns, pin->timer_cnt);
- seq_printf(file, "max timer overrun: %u usecs\n",
- pin->timer_max_overrun);
- seq_printf(file, "avg timer overrun: %u usecs\n",
- pin->timer_sum_overrun / pin->timer_100ms_overruns);
- }
- if (pin->rx_start_bit_low_too_short_cnt)
- seq_printf(file,
- "rx start bit low too short: %u (delta %u, ts %llu)\n",
- pin->rx_start_bit_low_too_short_cnt,
- pin->rx_start_bit_low_too_short_delta,
- pin->rx_start_bit_low_too_short_ts);
- if (pin->rx_start_bit_too_short_cnt)
- seq_printf(file,
- "rx start bit too short: %u (delta %u, ts %llu)\n",
- pin->rx_start_bit_too_short_cnt,
- pin->rx_start_bit_too_short_delta,
- pin->rx_start_bit_too_short_ts);
- if (pin->rx_start_bit_too_long_cnt)
- seq_printf(file, "rx start bit too long: %u\n",
- pin->rx_start_bit_too_long_cnt);
- if (pin->rx_data_bit_too_short_cnt)
- seq_printf(file,
- "rx data bit too short: %u (delta %u, ts %llu)\n",
- pin->rx_data_bit_too_short_cnt,
- pin->rx_data_bit_too_short_delta,
- pin->rx_data_bit_too_short_ts);
- if (pin->rx_data_bit_too_long_cnt)
- seq_printf(file, "rx data bit too long: %u\n",
- pin->rx_data_bit_too_long_cnt);
- seq_printf(file, "rx initiated low drive: %u\n", pin->rx_low_drive_cnt);
- seq_printf(file, "tx detected low drive: %u\n", pin->tx_low_drive_cnt);
- pin->work_pin_events_dropped_cnt = 0;
- pin->timer_cnt = 0;
- pin->timer_100ms_overruns = 0;
- pin->timer_300ms_overruns = 0;
- pin->timer_max_overrun = 0;
- pin->timer_sum_overrun = 0;
- pin->rx_start_bit_low_too_short_cnt = 0;
- pin->rx_start_bit_too_short_cnt = 0;
- pin->rx_start_bit_too_long_cnt = 0;
- pin->rx_data_bit_too_short_cnt = 0;
- pin->rx_data_bit_too_long_cnt = 0;
- pin->rx_low_drive_cnt = 0;
- pin->tx_low_drive_cnt = 0;
- if (pin->ops->status)
- pin->ops->status(adap, file);
-}
-
-static int cec_pin_adap_monitor_all_enable(struct cec_adapter *adap,
- bool enable)
-{
- struct cec_pin *pin = adap->pin;
-
- pin->monitor_all = enable;
- return 0;
-}
-
-static void cec_pin_adap_free(struct cec_adapter *adap)
-{
- struct cec_pin *pin = adap->pin;
-
- if (pin->ops->free)
- pin->ops->free(adap);
- adap->pin = NULL;
- kfree(pin);
-}
-
-static int cec_pin_received(struct cec_adapter *adap, struct cec_msg *msg)
-{
- struct cec_pin *pin = adap->pin;
-
- if (pin->ops->received)
- return pin->ops->received(adap, msg);
- return -ENOMSG;
-}
-
-void cec_pin_changed(struct cec_adapter *adap, bool value)
-{
- struct cec_pin *pin = adap->pin;
-
- cec_pin_update(pin, value, false);
- if (!value && (adap->is_configuring || adap->is_configured ||
- adap->monitor_all_cnt))
- atomic_set(&pin->work_irq_change, CEC_PIN_IRQ_DISABLE);
-}
-EXPORT_SYMBOL_GPL(cec_pin_changed);
-
-static const struct cec_adap_ops cec_pin_adap_ops = {
- .adap_enable = cec_pin_adap_enable,
- .adap_monitor_all_enable = cec_pin_adap_monitor_all_enable,
- .adap_log_addr = cec_pin_adap_log_addr,
- .adap_transmit = cec_pin_adap_transmit,
- .adap_status = cec_pin_adap_status,
- .adap_free = cec_pin_adap_free,
-#ifdef CONFIG_CEC_PIN_ERROR_INJ
- .error_inj_parse_line = cec_pin_error_inj_parse_line,
- .error_inj_show = cec_pin_error_inj_show,
-#endif
- .received = cec_pin_received,
-};
-
-struct cec_adapter *cec_pin_allocate_adapter(const struct cec_pin_ops *pin_ops,
- void *priv, const char *name, u32 caps)
-{
- struct cec_adapter *adap;
- struct cec_pin *pin = kzalloc(sizeof(*pin), GFP_KERNEL);
-
- if (pin == NULL)
- return ERR_PTR(-ENOMEM);
- pin->ops = pin_ops;
- hrtimer_init(&pin->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- pin->timer.function = cec_pin_timer;
- init_waitqueue_head(&pin->kthread_waitq);
- pin->tx_custom_low_usecs = CEC_TIM_CUSTOM_DEFAULT;
- pin->tx_custom_high_usecs = CEC_TIM_CUSTOM_DEFAULT;
-
- adap = cec_allocate_adapter(&cec_pin_adap_ops, priv, name,
- caps | CEC_CAP_MONITOR_ALL | CEC_CAP_MONITOR_PIN,
- CEC_MAX_LOG_ADDRS);
-
- if (IS_ERR(adap)) {
- kfree(pin);
- return adap;
- }
-
- adap->pin = pin;
- pin->adap = adap;
- cec_pin_update(pin, cec_pin_high(pin), true);
- return adap;
-}
-EXPORT_SYMBOL_GPL(cec_pin_allocate_adapter);
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * cec-priv.h - HDMI Consumer Electronics Control internal header
- *
- * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
- */
-
-#ifndef _CEC_PRIV_H
-#define _CEC_PRIV_H
-
-#include <linux/cec-funcs.h>
-#include <media/cec-notifier.h>
-
-#define dprintk(lvl, fmt, arg...) \
- do { \
- if (lvl <= cec_debug) \
- pr_info("cec-%s: " fmt, adap->name, ## arg); \
- } while (0)
-
-/* devnode to cec_adapter */
-#define to_cec_adapter(node) container_of(node, struct cec_adapter, devnode)
-
-static inline bool msg_is_raw(const struct cec_msg *msg)
-{
- return msg->flags & CEC_MSG_FL_RAW;
-}
-
-/* cec-core.c */
-extern int cec_debug;
-int cec_get_device(struct cec_devnode *devnode);
-void cec_put_device(struct cec_devnode *devnode);
-
-/* cec-adap.c */
-int cec_monitor_all_cnt_inc(struct cec_adapter *adap);
-void cec_monitor_all_cnt_dec(struct cec_adapter *adap);
-int cec_monitor_pin_cnt_inc(struct cec_adapter *adap);
-void cec_monitor_pin_cnt_dec(struct cec_adapter *adap);
-int cec_adap_status(struct seq_file *file, void *priv);
-int cec_thread_func(void *_adap);
-void __cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block);
-int __cec_s_log_addrs(struct cec_adapter *adap,
- struct cec_log_addrs *log_addrs, bool block);
-int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
- struct cec_fh *fh, bool block);
-void cec_queue_event_fh(struct cec_fh *fh,
- const struct cec_event *new_ev, u64 ts);
-
-/* cec-api.c */
-extern const struct file_operations cec_devnode_fops;
-
-#endif
--- /dev/null
+# SPDX-License-Identifier: GPL-2.0
+cec-objs := cec-core.o cec-adap.o cec-api.o
+
+ifeq ($(CONFIG_CEC_NOTIFIER),y)
+ cec-objs += cec-notifier.o
+endif
+
+ifeq ($(CONFIG_CEC_PIN),y)
+ cec-objs += cec-pin.o
+endif
+
+ifeq ($(CONFIG_CEC_PIN_ERROR_INJ),y)
+ cec-objs += cec-pin-error-inj.o
+endif
+
+obj-$(CONFIG_CEC_CORE) += cec.o
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * cec-adap.c - HDMI Consumer Electronics Control framework - CEC adapter
+ *
+ * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/kmod.h>
+#include <linux/ktime.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+#include <drm/drm_connector.h>
+#include <drm/drm_device.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_file.h>
+
+#include "cec-priv.h"
+
+static void cec_fill_msg_report_features(struct cec_adapter *adap,
+ struct cec_msg *msg,
+ unsigned int la_idx);
+
+/*
+ * 400 ms is the time it takes for one 16 byte message to be
+ * transferred and 5 is the maximum number of retries. Add
+ * another 100 ms as a margin. So if the transmit doesn't
+ * finish before that time something is really wrong and we
+ * have to time out.
+ *
+ * This is a sign that something it really wrong and a warning
+ * will be issued.
+ */
+#define CEC_XFER_TIMEOUT_MS (5 * 400 + 100)
+
+#define call_op(adap, op, arg...) \
+ (adap->ops->op ? adap->ops->op(adap, ## arg) : 0)
+
+#define call_void_op(adap, op, arg...) \
+ do { \
+ if (adap->ops->op) \
+ adap->ops->op(adap, ## arg); \
+ } while (0)
+
+static int cec_log_addr2idx(const struct cec_adapter *adap, u8 log_addr)
+{
+ int i;
+
+ for (i = 0; i < adap->log_addrs.num_log_addrs; i++)
+ if (adap->log_addrs.log_addr[i] == log_addr)
+ return i;
+ return -1;
+}
+
+static unsigned int cec_log_addr2dev(const struct cec_adapter *adap, u8 log_addr)
+{
+ int i = cec_log_addr2idx(adap, log_addr);
+
+ return adap->log_addrs.primary_device_type[i < 0 ? 0 : i];
+}
+
+u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size,
+ unsigned int *offset)
+{
+ unsigned int loc = cec_get_edid_spa_location(edid, size);
+
+ if (offset)
+ *offset = loc;
+ if (loc == 0)
+ return CEC_PHYS_ADDR_INVALID;
+ return (edid[loc] << 8) | edid[loc + 1];
+}
+EXPORT_SYMBOL_GPL(cec_get_edid_phys_addr);
+
+void cec_fill_conn_info_from_drm(struct cec_connector_info *conn_info,
+ const struct drm_connector *connector)
+{
+ memset(conn_info, 0, sizeof(*conn_info));
+ conn_info->type = CEC_CONNECTOR_TYPE_DRM;
+ conn_info->drm.card_no = connector->dev->primary->index;
+ conn_info->drm.connector_id = connector->base.id;
+}
+EXPORT_SYMBOL_GPL(cec_fill_conn_info_from_drm);
+
+/*
+ * Queue a new event for this filehandle. If ts == 0, then set it
+ * to the current time.
+ *
+ * We keep a queue of at most max_event events where max_event differs
+ * per event. If the queue becomes full, then drop the oldest event and
+ * keep track of how many events we've dropped.
+ */
+void cec_queue_event_fh(struct cec_fh *fh,
+ const struct cec_event *new_ev, u64 ts)
+{
+ static const u16 max_events[CEC_NUM_EVENTS] = {
+ 1, 1, 800, 800, 8, 8, 8, 8
+ };
+ struct cec_event_entry *entry;
+ unsigned int ev_idx = new_ev->event - 1;
+
+ if (WARN_ON(ev_idx >= ARRAY_SIZE(fh->events)))
+ return;
+
+ if (ts == 0)
+ ts = ktime_get_ns();
+
+ mutex_lock(&fh->lock);
+ if (ev_idx < CEC_NUM_CORE_EVENTS)
+ entry = &fh->core_events[ev_idx];
+ else
+ entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+ if (entry) {
+ if (new_ev->event == CEC_EVENT_LOST_MSGS &&
+ fh->queued_events[ev_idx]) {
+ entry->ev.lost_msgs.lost_msgs +=
+ new_ev->lost_msgs.lost_msgs;
+ goto unlock;
+ }
+ entry->ev = *new_ev;
+ entry->ev.ts = ts;
+
+ if (fh->queued_events[ev_idx] < max_events[ev_idx]) {
+ /* Add new msg at the end of the queue */
+ list_add_tail(&entry->list, &fh->events[ev_idx]);
+ fh->queued_events[ev_idx]++;
+ fh->total_queued_events++;
+ goto unlock;
+ }
+
+ if (ev_idx >= CEC_NUM_CORE_EVENTS) {
+ list_add_tail(&entry->list, &fh->events[ev_idx]);
+ /* drop the oldest event */
+ entry = list_first_entry(&fh->events[ev_idx],
+ struct cec_event_entry, list);
+ list_del(&entry->list);
+ kfree(entry);
+ }
+ }
+ /* Mark that events were lost */
+ entry = list_first_entry_or_null(&fh->events[ev_idx],
+ struct cec_event_entry, list);
+ if (entry)
+ entry->ev.flags |= CEC_EVENT_FL_DROPPED_EVENTS;
+
+unlock:
+ mutex_unlock(&fh->lock);
+ wake_up_interruptible(&fh->wait);
+}
+
+/* Queue a new event for all open filehandles. */
+static void cec_queue_event(struct cec_adapter *adap,
+ const struct cec_event *ev)
+{
+ u64 ts = ktime_get_ns();
+ struct cec_fh *fh;
+
+ mutex_lock(&adap->devnode.lock);
+ list_for_each_entry(fh, &adap->devnode.fhs, list)
+ cec_queue_event_fh(fh, ev, ts);
+ mutex_unlock(&adap->devnode.lock);
+}
+
+/* Notify userspace that the CEC pin changed state at the given time. */
+void cec_queue_pin_cec_event(struct cec_adapter *adap, bool is_high,
+ bool dropped_events, ktime_t ts)
+{
+ struct cec_event ev = {
+ .event = is_high ? CEC_EVENT_PIN_CEC_HIGH :
+ CEC_EVENT_PIN_CEC_LOW,
+ .flags = dropped_events ? CEC_EVENT_FL_DROPPED_EVENTS : 0,
+ };
+ struct cec_fh *fh;
+
+ mutex_lock(&adap->devnode.lock);
+ list_for_each_entry(fh, &adap->devnode.fhs, list)
+ if (fh->mode_follower == CEC_MODE_MONITOR_PIN)
+ cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
+ mutex_unlock(&adap->devnode.lock);
+}
+EXPORT_SYMBOL_GPL(cec_queue_pin_cec_event);
+
+/* Notify userspace that the HPD pin changed state at the given time. */
+void cec_queue_pin_hpd_event(struct cec_adapter *adap, bool is_high, ktime_t ts)
+{
+ struct cec_event ev = {
+ .event = is_high ? CEC_EVENT_PIN_HPD_HIGH :
+ CEC_EVENT_PIN_HPD_LOW,
+ };
+ struct cec_fh *fh;
+
+ mutex_lock(&adap->devnode.lock);
+ list_for_each_entry(fh, &adap->devnode.fhs, list)
+ cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
+ mutex_unlock(&adap->devnode.lock);
+}
+EXPORT_SYMBOL_GPL(cec_queue_pin_hpd_event);
+
+/* Notify userspace that the 5V pin changed state at the given time. */
+void cec_queue_pin_5v_event(struct cec_adapter *adap, bool is_high, ktime_t ts)
+{
+ struct cec_event ev = {
+ .event = is_high ? CEC_EVENT_PIN_5V_HIGH :
+ CEC_EVENT_PIN_5V_LOW,
+ };
+ struct cec_fh *fh;
+
+ mutex_lock(&adap->devnode.lock);
+ list_for_each_entry(fh, &adap->devnode.fhs, list)
+ cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
+ mutex_unlock(&adap->devnode.lock);
+}
+EXPORT_SYMBOL_GPL(cec_queue_pin_5v_event);
+
+/*
+ * Queue a new message for this filehandle.
+ *
+ * We keep a queue of at most CEC_MAX_MSG_RX_QUEUE_SZ messages. If the
+ * queue becomes full, then drop the oldest message and keep track
+ * of how many messages we've dropped.
+ */
+static void cec_queue_msg_fh(struct cec_fh *fh, const struct cec_msg *msg)
+{
+ static const struct cec_event ev_lost_msgs = {
+ .event = CEC_EVENT_LOST_MSGS,
+ .flags = 0,
+ {
+ .lost_msgs = { 1 },
+ },
+ };
+ struct cec_msg_entry *entry;
+
+ mutex_lock(&fh->lock);
+ entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+ if (entry) {
+ entry->msg = *msg;
+ /* Add new msg at the end of the queue */
+ list_add_tail(&entry->list, &fh->msgs);
+
+ if (fh->queued_msgs < CEC_MAX_MSG_RX_QUEUE_SZ) {
+ /* All is fine if there is enough room */
+ fh->queued_msgs++;
+ mutex_unlock(&fh->lock);
+ wake_up_interruptible(&fh->wait);
+ return;
+ }
+
+ /*
+ * if the message queue is full, then drop the oldest one and
+ * send a lost message event.
+ */
+ entry = list_first_entry(&fh->msgs, struct cec_msg_entry, list);
+ list_del(&entry->list);
+ kfree(entry);
+ }
+ mutex_unlock(&fh->lock);
+
+ /*
+ * We lost a message, either because kmalloc failed or the queue
+ * was full.
+ */
+ cec_queue_event_fh(fh, &ev_lost_msgs, ktime_get_ns());
+}
+
+/*
+ * Queue the message for those filehandles that are in monitor mode.
+ * If valid_la is true (this message is for us or was sent by us),
+ * then pass it on to any monitoring filehandle. If this message
+ * isn't for us or from us, then only give it to filehandles that
+ * are in MONITOR_ALL mode.
+ *
+ * This can only happen if the CEC_CAP_MONITOR_ALL capability is
+ * set and the CEC adapter was placed in 'monitor all' mode.
+ */
+static void cec_queue_msg_monitor(struct cec_adapter *adap,
+ const struct cec_msg *msg,
+ bool valid_la)
+{
+ struct cec_fh *fh;
+ u32 monitor_mode = valid_la ? CEC_MODE_MONITOR :
+ CEC_MODE_MONITOR_ALL;
+
+ mutex_lock(&adap->devnode.lock);
+ list_for_each_entry(fh, &adap->devnode.fhs, list) {
+ if (fh->mode_follower >= monitor_mode)
+ cec_queue_msg_fh(fh, msg);
+ }
+ mutex_unlock(&adap->devnode.lock);
+}
+
+/*
+ * Queue the message for follower filehandles.
+ */
+static void cec_queue_msg_followers(struct cec_adapter *adap,
+ const struct cec_msg *msg)
+{
+ struct cec_fh *fh;
+
+ mutex_lock(&adap->devnode.lock);
+ list_for_each_entry(fh, &adap->devnode.fhs, list) {
+ if (fh->mode_follower == CEC_MODE_FOLLOWER)
+ cec_queue_msg_fh(fh, msg);
+ }
+ mutex_unlock(&adap->devnode.lock);
+}
+
+/* Notify userspace of an adapter state change. */
+static void cec_post_state_event(struct cec_adapter *adap)
+{
+ struct cec_event ev = {
+ .event = CEC_EVENT_STATE_CHANGE,
+ };
+
+ ev.state_change.phys_addr = adap->phys_addr;
+ ev.state_change.log_addr_mask = adap->log_addrs.log_addr_mask;
+ ev.state_change.have_conn_info =
+ adap->conn_info.type != CEC_CONNECTOR_TYPE_NO_CONNECTOR;
+ cec_queue_event(adap, &ev);
+}
+
+/*
+ * A CEC transmit (and a possible wait for reply) completed.
+ * If this was in blocking mode, then complete it, otherwise
+ * queue the message for userspace to dequeue later.
+ *
+ * This function is called with adap->lock held.
+ */
+static void cec_data_completed(struct cec_data *data)
+{
+ /*
+ * Delete this transmit from the filehandle's xfer_list since
+ * we're done with it.
+ *
+ * Note that if the filehandle is closed before this transmit
+ * finished, then the release() function will set data->fh to NULL.
+ * Without that we would be referring to a closed filehandle.
+ */
+ if (data->fh)
+ list_del(&data->xfer_list);
+
+ if (data->blocking) {
+ /*
+ * Someone is blocking so mark the message as completed
+ * and call complete.
+ */
+ data->completed = true;
+ complete(&data->c);
+ } else {
+ /*
+ * No blocking, so just queue the message if needed and
+ * free the memory.
+ */
+ if (data->fh)
+ cec_queue_msg_fh(data->fh, &data->msg);
+ kfree(data);
+ }
+}
+
+/*
+ * A pending CEC transmit needs to be cancelled, either because the CEC
+ * adapter is disabled or the transmit takes an impossibly long time to
+ * finish.
+ *
+ * This function is called with adap->lock held.
+ */
+static void cec_data_cancel(struct cec_data *data, u8 tx_status)
+{
+ /*
+ * It's either the current transmit, or it is a pending
+ * transmit. Take the appropriate action to clear it.
+ */
+ if (data->adap->transmitting == data) {
+ data->adap->transmitting = NULL;
+ } else {
+ list_del_init(&data->list);
+ if (!(data->msg.tx_status & CEC_TX_STATUS_OK))
+ if (!WARN_ON(!data->adap->transmit_queue_sz))
+ data->adap->transmit_queue_sz--;
+ }
+
+ if (data->msg.tx_status & CEC_TX_STATUS_OK) {
+ data->msg.rx_ts = ktime_get_ns();
+ data->msg.rx_status = CEC_RX_STATUS_ABORTED;
+ } else {
+ data->msg.tx_ts = ktime_get_ns();
+ data->msg.tx_status |= tx_status |
+ CEC_TX_STATUS_MAX_RETRIES;
+ data->msg.tx_error_cnt++;
+ data->attempts = 0;
+ }
+
+ /* Queue transmitted message for monitoring purposes */
+ cec_queue_msg_monitor(data->adap, &data->msg, 1);
+
+ cec_data_completed(data);
+}
+
+/*
+ * Flush all pending transmits and cancel any pending timeout work.
+ *
+ * This function is called with adap->lock held.
+ */
+static void cec_flush(struct cec_adapter *adap)
+{
+ struct cec_data *data, *n;
+
+ /*
+ * If the adapter is disabled, or we're asked to stop,
+ * then cancel any pending transmits.
+ */
+ while (!list_empty(&adap->transmit_queue)) {
+ data = list_first_entry(&adap->transmit_queue,
+ struct cec_data, list);
+ cec_data_cancel(data, CEC_TX_STATUS_ABORTED);
+ }
+ if (adap->transmitting)
+ cec_data_cancel(adap->transmitting, CEC_TX_STATUS_ABORTED);
+
+ /* Cancel the pending timeout work. */
+ list_for_each_entry_safe(data, n, &adap->wait_queue, list) {
+ if (cancel_delayed_work(&data->work))
+ cec_data_cancel(data, CEC_TX_STATUS_OK);
+ /*
+ * If cancel_delayed_work returned false, then
+ * the cec_wait_timeout function is running,
+ * which will call cec_data_completed. So no
+ * need to do anything special in that case.
+ */
+ }
+ /*
+ * If something went wrong and this counter isn't what it should
+ * be, then this will reset it back to 0. Warn if it is not 0,
+ * since it indicates a bug, either in this framework or in a
+ * CEC driver.
+ */
+ if (WARN_ON(adap->transmit_queue_sz))
+ adap->transmit_queue_sz = 0;
+}
+
+/*
+ * Main CEC state machine
+ *
+ * Wait until the thread should be stopped, or we are not transmitting and
+ * a new transmit message is queued up, in which case we start transmitting
+ * that message. When the adapter finished transmitting the message it will
+ * call cec_transmit_done().
+ *
+ * If the adapter is disabled, then remove all queued messages instead.
+ *
+ * If the current transmit times out, then cancel that transmit.
+ */
+int cec_thread_func(void *_adap)
+{
+ struct cec_adapter *adap = _adap;
+
+ for (;;) {
+ unsigned int signal_free_time;
+ struct cec_data *data;
+ bool timeout = false;
+ u8 attempts;
+
+ if (adap->transmit_in_progress) {
+ int err;
+
+ /*
+ * We are transmitting a message, so add a timeout
+ * to prevent the state machine to get stuck waiting
+ * for this message to finalize and add a check to
+ * see if the adapter is disabled in which case the
+ * transmit should be canceled.
+ */
+ err = wait_event_interruptible_timeout(adap->kthread_waitq,
+ (adap->needs_hpd &&
+ (!adap->is_configured && !adap->is_configuring)) ||
+ kthread_should_stop() ||
+ (!adap->transmit_in_progress &&
+ !list_empty(&adap->transmit_queue)),
+ msecs_to_jiffies(CEC_XFER_TIMEOUT_MS));
+ timeout = err == 0;
+ } else {
+ /* Otherwise we just wait for something to happen. */
+ wait_event_interruptible(adap->kthread_waitq,
+ kthread_should_stop() ||
+ (!adap->transmit_in_progress &&
+ !list_empty(&adap->transmit_queue)));
+ }
+
+ mutex_lock(&adap->lock);
+
+ if ((adap->needs_hpd &&
+ (!adap->is_configured && !adap->is_configuring)) ||
+ kthread_should_stop()) {
+ cec_flush(adap);
+ goto unlock;
+ }
+
+ if (adap->transmit_in_progress && timeout) {
+ /*
+ * If we timeout, then log that. Normally this does
+ * not happen and it is an indication of a faulty CEC
+ * adapter driver, or the CEC bus is in some weird
+ * state. On rare occasions it can happen if there is
+ * so much traffic on the bus that the adapter was
+ * unable to transmit for CEC_XFER_TIMEOUT_MS (2.1s).
+ */
+ if (adap->transmitting) {
+ pr_warn("cec-%s: message %*ph timed out\n", adap->name,
+ adap->transmitting->msg.len,
+ adap->transmitting->msg.msg);
+ /* Just give up on this. */
+ cec_data_cancel(adap->transmitting,
+ CEC_TX_STATUS_TIMEOUT);
+ } else {
+ pr_warn("cec-%s: transmit timed out\n", adap->name);
+ }
+ adap->transmit_in_progress = false;
+ adap->tx_timeouts++;
+ goto unlock;
+ }
+
+ /*
+ * If we are still transmitting, or there is nothing new to
+ * transmit, then just continue waiting.
+ */
+ if (adap->transmit_in_progress || list_empty(&adap->transmit_queue))
+ goto unlock;
+
+ /* Get a new message to transmit */
+ data = list_first_entry(&adap->transmit_queue,
+ struct cec_data, list);
+ list_del_init(&data->list);
+ if (!WARN_ON(!data->adap->transmit_queue_sz))
+ adap->transmit_queue_sz--;
+
+ /* Make this the current transmitting message */
+ adap->transmitting = data;
+
+ /*
+ * Suggested number of attempts as per the CEC 2.0 spec:
+ * 4 attempts is the default, except for 'secondary poll
+ * messages', i.e. poll messages not sent during the adapter
+ * configuration phase when it allocates logical addresses.
+ */
+ if (data->msg.len == 1 && adap->is_configured)
+ attempts = 2;
+ else
+ attempts = 4;
+
+ /* Set the suggested signal free time */
+ if (data->attempts) {
+ /* should be >= 3 data bit periods for a retry */
+ signal_free_time = CEC_SIGNAL_FREE_TIME_RETRY;
+ } else if (adap->last_initiator !=
+ cec_msg_initiator(&data->msg)) {
+ /* should be >= 5 data bit periods for new initiator */
+ signal_free_time = CEC_SIGNAL_FREE_TIME_NEW_INITIATOR;
+ adap->last_initiator = cec_msg_initiator(&data->msg);
+ } else {
+ /*
+ * should be >= 7 data bit periods for sending another
+ * frame immediately after another.
+ */
+ signal_free_time = CEC_SIGNAL_FREE_TIME_NEXT_XFER;
+ }
+ if (data->attempts == 0)
+ data->attempts = attempts;
+
+ /* Tell the adapter to transmit, cancel on error */
+ if (adap->ops->adap_transmit(adap, data->attempts,
+ signal_free_time, &data->msg))
+ cec_data_cancel(data, CEC_TX_STATUS_ABORTED);
+ else
+ adap->transmit_in_progress = true;
+
+unlock:
+ mutex_unlock(&adap->lock);
+
+ if (kthread_should_stop())
+ break;
+ }
+ return 0;
+}
+
+/*
+ * Called by the CEC adapter if a transmit finished.
+ */
+void cec_transmit_done_ts(struct cec_adapter *adap, u8 status,
+ u8 arb_lost_cnt, u8 nack_cnt, u8 low_drive_cnt,
+ u8 error_cnt, ktime_t ts)
+{
+ struct cec_data *data;
+ struct cec_msg *msg;
+ unsigned int attempts_made = arb_lost_cnt + nack_cnt +
+ low_drive_cnt + error_cnt;
+
+ dprintk(2, "%s: status 0x%02x\n", __func__, status);
+ if (attempts_made < 1)
+ attempts_made = 1;
+
+ mutex_lock(&adap->lock);
+ data = adap->transmitting;
+ if (!data) {
+ /*
+ * This might happen if a transmit was issued and the cable is
+ * unplugged while the transmit is ongoing. Ignore this
+ * transmit in that case.
+ */
+ if (!adap->transmit_in_progress)
+ dprintk(1, "%s was called without an ongoing transmit!\n",
+ __func__);
+ adap->transmit_in_progress = false;
+ goto wake_thread;
+ }
+ adap->transmit_in_progress = false;
+
+ msg = &data->msg;
+
+ /* Drivers must fill in the status! */
+ WARN_ON(status == 0);
+ msg->tx_ts = ktime_to_ns(ts);
+ msg->tx_status |= status;
+ msg->tx_arb_lost_cnt += arb_lost_cnt;
+ msg->tx_nack_cnt += nack_cnt;
+ msg->tx_low_drive_cnt += low_drive_cnt;
+ msg->tx_error_cnt += error_cnt;
+
+ /* Mark that we're done with this transmit */
+ adap->transmitting = NULL;
+
+ /*
+ * If there are still retry attempts left and there was an error and
+ * the hardware didn't signal that it retried itself (by setting
+ * CEC_TX_STATUS_MAX_RETRIES), then we will retry ourselves.
+ */
+ if (data->attempts > attempts_made &&
+ !(status & (CEC_TX_STATUS_MAX_RETRIES | CEC_TX_STATUS_OK))) {
+ /* Retry this message */
+ data->attempts -= attempts_made;
+ if (msg->timeout)
+ dprintk(2, "retransmit: %*ph (attempts: %d, wait for 0x%02x)\n",
+ msg->len, msg->msg, data->attempts, msg->reply);
+ else
+ dprintk(2, "retransmit: %*ph (attempts: %d)\n",
+ msg->len, msg->msg, data->attempts);
+ /* Add the message in front of the transmit queue */
+ list_add(&data->list, &adap->transmit_queue);
+ adap->transmit_queue_sz++;
+ goto wake_thread;
+ }
+
+ data->attempts = 0;
+
+ /* Always set CEC_TX_STATUS_MAX_RETRIES on error */
+ if (!(status & CEC_TX_STATUS_OK))
+ msg->tx_status |= CEC_TX_STATUS_MAX_RETRIES;
+
+ /* Queue transmitted message for monitoring purposes */
+ cec_queue_msg_monitor(adap, msg, 1);
+
+ if ((status & CEC_TX_STATUS_OK) && adap->is_configured &&
+ msg->timeout) {
+ /*
+ * Queue the message into the wait queue if we want to wait
+ * for a reply.
+ */
+ list_add_tail(&data->list, &adap->wait_queue);
+ schedule_delayed_work(&data->work,
+ msecs_to_jiffies(msg->timeout));
+ } else {
+ /* Otherwise we're done */
+ cec_data_completed(data);
+ }
+
+wake_thread:
+ /*
+ * Wake up the main thread to see if another message is ready
+ * for transmitting or to retry the current message.
+ */
+ wake_up_interruptible(&adap->kthread_waitq);
+ mutex_unlock(&adap->lock);
+}
+EXPORT_SYMBOL_GPL(cec_transmit_done_ts);
+
+void cec_transmit_attempt_done_ts(struct cec_adapter *adap,
+ u8 status, ktime_t ts)
+{
+ switch (status & ~CEC_TX_STATUS_MAX_RETRIES) {
+ case CEC_TX_STATUS_OK:
+ cec_transmit_done_ts(adap, status, 0, 0, 0, 0, ts);
+ return;
+ case CEC_TX_STATUS_ARB_LOST:
+ cec_transmit_done_ts(adap, status, 1, 0, 0, 0, ts);
+ return;
+ case CEC_TX_STATUS_NACK:
+ cec_transmit_done_ts(adap, status, 0, 1, 0, 0, ts);
+ return;
+ case CEC_TX_STATUS_LOW_DRIVE:
+ cec_transmit_done_ts(adap, status, 0, 0, 1, 0, ts);
+ return;
+ case CEC_TX_STATUS_ERROR:
+ cec_transmit_done_ts(adap, status, 0, 0, 0, 1, ts);
+ return;
+ default:
+ /* Should never happen */
+ WARN(1, "cec-%s: invalid status 0x%02x\n", adap->name, status);
+ return;
+ }
+}
+EXPORT_SYMBOL_GPL(cec_transmit_attempt_done_ts);
+
+/*
+ * Called when waiting for a reply times out.
+ */
+static void cec_wait_timeout(struct work_struct *work)
+{
+ struct cec_data *data = container_of(work, struct cec_data, work.work);
+ struct cec_adapter *adap = data->adap;
+
+ mutex_lock(&adap->lock);
+ /*
+ * Sanity check in case the timeout and the arrival of the message
+ * happened at the same time.
+ */
+ if (list_empty(&data->list))
+ goto unlock;
+
+ /* Mark the message as timed out */
+ list_del_init(&data->list);
+ data->msg.rx_ts = ktime_get_ns();
+ data->msg.rx_status = CEC_RX_STATUS_TIMEOUT;
+ cec_data_completed(data);
+unlock:
+ mutex_unlock(&adap->lock);
+}
+
+/*
+ * Transmit a message. The fh argument may be NULL if the transmit is not
+ * associated with a specific filehandle.
+ *
+ * This function is called with adap->lock held.
+ */
+int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
+ struct cec_fh *fh, bool block)
+{
+ struct cec_data *data;
+ bool is_raw = msg_is_raw(msg);
+
+ msg->rx_ts = 0;
+ msg->tx_ts = 0;
+ msg->rx_status = 0;
+ msg->tx_status = 0;
+ msg->tx_arb_lost_cnt = 0;
+ msg->tx_nack_cnt = 0;
+ msg->tx_low_drive_cnt = 0;
+ msg->tx_error_cnt = 0;
+ msg->sequence = 0;
+
+ if (msg->reply && msg->timeout == 0) {
+ /* Make sure the timeout isn't 0. */
+ msg->timeout = 1000;
+ }
+ msg->flags &= CEC_MSG_FL_REPLY_TO_FOLLOWERS | CEC_MSG_FL_RAW;
+
+ if (!msg->timeout)
+ msg->flags &= ~CEC_MSG_FL_REPLY_TO_FOLLOWERS;
+
+ /* Sanity checks */
+ if (msg->len == 0 || msg->len > CEC_MAX_MSG_SIZE) {
+ dprintk(1, "%s: invalid length %d\n", __func__, msg->len);
+ return -EINVAL;
+ }
+
+ memset(msg->msg + msg->len, 0, sizeof(msg->msg) - msg->len);
+
+ if (msg->timeout)
+ dprintk(2, "%s: %*ph (wait for 0x%02x%s)\n",
+ __func__, msg->len, msg->msg, msg->reply,
+ !block ? ", nb" : "");
+ else
+ dprintk(2, "%s: %*ph%s\n",
+ __func__, msg->len, msg->msg, !block ? " (nb)" : "");
+
+ if (msg->timeout && msg->len == 1) {
+ dprintk(1, "%s: can't reply to poll msg\n", __func__);
+ return -EINVAL;
+ }
+
+ if (is_raw) {
+ if (!capable(CAP_SYS_RAWIO))
+ return -EPERM;
+ } else {
+ /* A CDC-Only device can only send CDC messages */
+ if ((adap->log_addrs.flags & CEC_LOG_ADDRS_FL_CDC_ONLY) &&
+ (msg->len == 1 || msg->msg[1] != CEC_MSG_CDC_MESSAGE)) {
+ dprintk(1, "%s: not a CDC message\n", __func__);
+ return -EINVAL;
+ }
+
+ if (msg->len >= 4 && msg->msg[1] == CEC_MSG_CDC_MESSAGE) {
+ msg->msg[2] = adap->phys_addr >> 8;
+ msg->msg[3] = adap->phys_addr & 0xff;
+ }
+
+ if (msg->len == 1) {
+ if (cec_msg_destination(msg) == 0xf) {
+ dprintk(1, "%s: invalid poll message\n",
+ __func__);
+ return -EINVAL;
+ }
+ if (cec_has_log_addr(adap, cec_msg_destination(msg))) {
+ /*
+ * If the destination is a logical address our
+ * adapter has already claimed, then just NACK
+ * this. It depends on the hardware what it will
+ * do with a POLL to itself (some OK this), so
+ * it is just as easy to handle it here so the
+ * behavior will be consistent.
+ */
+ msg->tx_ts = ktime_get_ns();
+ msg->tx_status = CEC_TX_STATUS_NACK |
+ CEC_TX_STATUS_MAX_RETRIES;
+ msg->tx_nack_cnt = 1;
+ msg->sequence = ++adap->sequence;
+ if (!msg->sequence)
+ msg->sequence = ++adap->sequence;
+ return 0;
+ }
+ }
+ if (msg->len > 1 && !cec_msg_is_broadcast(msg) &&
+ cec_has_log_addr(adap, cec_msg_destination(msg))) {
+ dprintk(1, "%s: destination is the adapter itself\n",
+ __func__);
+ return -EINVAL;
+ }
+ if (msg->len > 1 && adap->is_configured &&
+ !cec_has_log_addr(adap, cec_msg_initiator(msg))) {
+ dprintk(1, "%s: initiator has unknown logical address %d\n",
+ __func__, cec_msg_initiator(msg));
+ return -EINVAL;
+ }
+ /*
+ * Special case: allow Ping and IMAGE/TEXT_VIEW_ON to be
+ * transmitted to a TV, even if the adapter is unconfigured.
+ * This makes it possible to detect or wake up displays that
+ * pull down the HPD when in standby.
+ */
+ if (!adap->is_configured && !adap->is_configuring &&
+ (msg->len > 2 ||
+ cec_msg_destination(msg) != CEC_LOG_ADDR_TV ||
+ (msg->len == 2 && msg->msg[1] != CEC_MSG_IMAGE_VIEW_ON &&
+ msg->msg[1] != CEC_MSG_TEXT_VIEW_ON))) {
+ dprintk(1, "%s: adapter is unconfigured\n", __func__);
+ return -ENONET;
+ }
+ }
+
+ if (!adap->is_configured && !adap->is_configuring) {
+ if (adap->needs_hpd) {
+ dprintk(1, "%s: adapter is unconfigured and needs HPD\n",
+ __func__);
+ return -ENONET;
+ }
+ if (msg->reply) {
+ dprintk(1, "%s: invalid msg->reply\n", __func__);
+ return -EINVAL;
+ }
+ }
+
+ if (adap->transmit_queue_sz >= CEC_MAX_MSG_TX_QUEUE_SZ) {
+ dprintk(2, "%s: transmit queue full\n", __func__);
+ return -EBUSY;
+ }
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ msg->sequence = ++adap->sequence;
+ if (!msg->sequence)
+ msg->sequence = ++adap->sequence;
+
+ data->msg = *msg;
+ data->fh = fh;
+ data->adap = adap;
+ data->blocking = block;
+
+ init_completion(&data->c);
+ INIT_DELAYED_WORK(&data->work, cec_wait_timeout);
+
+ if (fh)
+ list_add_tail(&data->xfer_list, &fh->xfer_list);
+
+ list_add_tail(&data->list, &adap->transmit_queue);
+ adap->transmit_queue_sz++;
+ if (!adap->transmitting)
+ wake_up_interruptible(&adap->kthread_waitq);
+
+ /* All done if we don't need to block waiting for completion */
+ if (!block)
+ return 0;
+
+ /*
+ * Release the lock and wait, retake the lock afterwards.
+ */
+ mutex_unlock(&adap->lock);
+ wait_for_completion_killable(&data->c);
+ if (!data->completed)
+ cancel_delayed_work_sync(&data->work);
+ mutex_lock(&adap->lock);
+
+ /* Cancel the transmit if it was interrupted */
+ if (!data->completed)
+ cec_data_cancel(data, CEC_TX_STATUS_ABORTED);
+
+ /* The transmit completed (possibly with an error) */
+ *msg = data->msg;
+ kfree(data);
+ return 0;
+}
+
+/* Helper function to be used by drivers and this framework. */
+int cec_transmit_msg(struct cec_adapter *adap, struct cec_msg *msg,
+ bool block)
+{
+ int ret;
+
+ mutex_lock(&adap->lock);
+ ret = cec_transmit_msg_fh(adap, msg, NULL, block);
+ mutex_unlock(&adap->lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(cec_transmit_msg);
+
+/*
+ * I don't like forward references but without this the low-level
+ * cec_received_msg() function would come after a bunch of high-level
+ * CEC protocol handling functions. That was very confusing.
+ */
+static int cec_receive_notify(struct cec_adapter *adap, struct cec_msg *msg,
+ bool is_reply);
+
+#define DIRECTED 0x80
+#define BCAST1_4 0x40
+#define BCAST2_0 0x20 /* broadcast only allowed for >= 2.0 */
+#define BCAST (BCAST1_4 | BCAST2_0)
+#define BOTH (BCAST | DIRECTED)
+
+/*
+ * Specify minimum length and whether the message is directed, broadcast
+ * or both. Messages that do not match the criteria are ignored as per
+ * the CEC specification.
+ */
+static const u8 cec_msg_size[256] = {
+ [CEC_MSG_ACTIVE_SOURCE] = 4 | BCAST,
+ [CEC_MSG_IMAGE_VIEW_ON] = 2 | DIRECTED,
+ [CEC_MSG_TEXT_VIEW_ON] = 2 | DIRECTED,
+ [CEC_MSG_INACTIVE_SOURCE] = 4 | DIRECTED,
+ [CEC_MSG_REQUEST_ACTIVE_SOURCE] = 2 | BCAST,
+ [CEC_MSG_ROUTING_CHANGE] = 6 | BCAST,
+ [CEC_MSG_ROUTING_INFORMATION] = 4 | BCAST,
+ [CEC_MSG_SET_STREAM_PATH] = 4 | BCAST,
+ [CEC_MSG_STANDBY] = 2 | BOTH,
+ [CEC_MSG_RECORD_OFF] = 2 | DIRECTED,
+ [CEC_MSG_RECORD_ON] = 3 | DIRECTED,
+ [CEC_MSG_RECORD_STATUS] = 3 | DIRECTED,
+ [CEC_MSG_RECORD_TV_SCREEN] = 2 | DIRECTED,
+ [CEC_MSG_CLEAR_ANALOGUE_TIMER] = 13 | DIRECTED,
+ [CEC_MSG_CLEAR_DIGITAL_TIMER] = 16 | DIRECTED,
+ [CEC_MSG_CLEAR_EXT_TIMER] = 13 | DIRECTED,
+ [CEC_MSG_SET_ANALOGUE_TIMER] = 13 | DIRECTED,
+ [CEC_MSG_SET_DIGITAL_TIMER] = 16 | DIRECTED,
+ [CEC_MSG_SET_EXT_TIMER] = 13 | DIRECTED,
+ [CEC_MSG_SET_TIMER_PROGRAM_TITLE] = 2 | DIRECTED,
+ [CEC_MSG_TIMER_CLEARED_STATUS] = 3 | DIRECTED,
+ [CEC_MSG_TIMER_STATUS] = 3 | DIRECTED,
+ [CEC_MSG_CEC_VERSION] = 3 | DIRECTED,
+ [CEC_MSG_GET_CEC_VERSION] = 2 | DIRECTED,
+ [CEC_MSG_GIVE_PHYSICAL_ADDR] = 2 | DIRECTED,
+ [CEC_MSG_GET_MENU_LANGUAGE] = 2 | DIRECTED,
+ [CEC_MSG_REPORT_PHYSICAL_ADDR] = 5 | BCAST,
+ [CEC_MSG_SET_MENU_LANGUAGE] = 5 | BCAST,
+ [CEC_MSG_REPORT_FEATURES] = 6 | BCAST,
+ [CEC_MSG_GIVE_FEATURES] = 2 | DIRECTED,
+ [CEC_MSG_DECK_CONTROL] = 3 | DIRECTED,
+ [CEC_MSG_DECK_STATUS] = 3 | DIRECTED,
+ [CEC_MSG_GIVE_DECK_STATUS] = 3 | DIRECTED,
+ [CEC_MSG_PLAY] = 3 | DIRECTED,
+ [CEC_MSG_GIVE_TUNER_DEVICE_STATUS] = 3 | DIRECTED,
+ [CEC_MSG_SELECT_ANALOGUE_SERVICE] = 6 | DIRECTED,
+ [CEC_MSG_SELECT_DIGITAL_SERVICE] = 9 | DIRECTED,
+ [CEC_MSG_TUNER_DEVICE_STATUS] = 7 | DIRECTED,
+ [CEC_MSG_TUNER_STEP_DECREMENT] = 2 | DIRECTED,
+ [CEC_MSG_TUNER_STEP_INCREMENT] = 2 | DIRECTED,
+ [CEC_MSG_DEVICE_VENDOR_ID] = 5 | BCAST,
+ [CEC_MSG_GIVE_DEVICE_VENDOR_ID] = 2 | DIRECTED,
+ [CEC_MSG_VENDOR_COMMAND] = 2 | DIRECTED,
+ [CEC_MSG_VENDOR_COMMAND_WITH_ID] = 5 | BOTH,
+ [CEC_MSG_VENDOR_REMOTE_BUTTON_DOWN] = 2 | BOTH,
+ [CEC_MSG_VENDOR_REMOTE_BUTTON_UP] = 2 | BOTH,
+ [CEC_MSG_SET_OSD_STRING] = 3 | DIRECTED,
+ [CEC_MSG_GIVE_OSD_NAME] = 2 | DIRECTED,
+ [CEC_MSG_SET_OSD_NAME] = 2 | DIRECTED,
+ [CEC_MSG_MENU_REQUEST] = 3 | DIRECTED,
+ [CEC_MSG_MENU_STATUS] = 3 | DIRECTED,
+ [CEC_MSG_USER_CONTROL_PRESSED] = 3 | DIRECTED,
+ [CEC_MSG_USER_CONTROL_RELEASED] = 2 | DIRECTED,
+ [CEC_MSG_GIVE_DEVICE_POWER_STATUS] = 2 | DIRECTED,
+ [CEC_MSG_REPORT_POWER_STATUS] = 3 | DIRECTED | BCAST2_0,
+ [CEC_MSG_FEATURE_ABORT] = 4 | DIRECTED,
+ [CEC_MSG_ABORT] = 2 | DIRECTED,
+ [CEC_MSG_GIVE_AUDIO_STATUS] = 2 | DIRECTED,
+ [CEC_MSG_GIVE_SYSTEM_AUDIO_MODE_STATUS] = 2 | DIRECTED,
+ [CEC_MSG_REPORT_AUDIO_STATUS] = 3 | DIRECTED,
+ [CEC_MSG_REPORT_SHORT_AUDIO_DESCRIPTOR] = 2 | DIRECTED,
+ [CEC_MSG_REQUEST_SHORT_AUDIO_DESCRIPTOR] = 2 | DIRECTED,
+ [CEC_MSG_SET_SYSTEM_AUDIO_MODE] = 3 | BOTH,
+ [CEC_MSG_SYSTEM_AUDIO_MODE_REQUEST] = 2 | DIRECTED,
+ [CEC_MSG_SYSTEM_AUDIO_MODE_STATUS] = 3 | DIRECTED,
+ [CEC_MSG_SET_AUDIO_RATE] = 3 | DIRECTED,
+ [CEC_MSG_INITIATE_ARC] = 2 | DIRECTED,
+ [CEC_MSG_REPORT_ARC_INITIATED] = 2 | DIRECTED,
+ [CEC_MSG_REPORT_ARC_TERMINATED] = 2 | DIRECTED,
+ [CEC_MSG_REQUEST_ARC_INITIATION] = 2 | DIRECTED,
+ [CEC_MSG_REQUEST_ARC_TERMINATION] = 2 | DIRECTED,
+ [CEC_MSG_TERMINATE_ARC] = 2 | DIRECTED,
+ [CEC_MSG_REQUEST_CURRENT_LATENCY] = 4 | BCAST,
+ [CEC_MSG_REPORT_CURRENT_LATENCY] = 6 | BCAST,
+ [CEC_MSG_CDC_MESSAGE] = 2 | BCAST,
+};
+
+/* Called by the CEC adapter if a message is received */
+void cec_received_msg_ts(struct cec_adapter *adap,
+ struct cec_msg *msg, ktime_t ts)
+{
+ struct cec_data *data;
+ u8 msg_init = cec_msg_initiator(msg);
+ u8 msg_dest = cec_msg_destination(msg);
+ u8 cmd = msg->msg[1];
+ bool is_reply = false;
+ bool valid_la = true;
+ u8 min_len = 0;
+
+ if (WARN_ON(!msg->len || msg->len > CEC_MAX_MSG_SIZE))
+ return;
+
+ /*
+ * Some CEC adapters will receive the messages that they transmitted.
+ * This test filters out those messages by checking if we are the
+ * initiator, and just returning in that case.
+ *
+ * Note that this won't work if this is an Unregistered device.
+ *
+ * It is bad practice if the hardware receives the message that it
+ * transmitted and luckily most CEC adapters behave correctly in this
+ * respect.
+ */
+ if (msg_init != CEC_LOG_ADDR_UNREGISTERED &&
+ cec_has_log_addr(adap, msg_init))
+ return;
+
+ msg->rx_ts = ktime_to_ns(ts);
+ msg->rx_status = CEC_RX_STATUS_OK;
+ msg->sequence = msg->reply = msg->timeout = 0;
+ msg->tx_status = 0;
+ msg->tx_ts = 0;
+ msg->tx_arb_lost_cnt = 0;
+ msg->tx_nack_cnt = 0;
+ msg->tx_low_drive_cnt = 0;
+ msg->tx_error_cnt = 0;
+ msg->flags = 0;
+ memset(msg->msg + msg->len, 0, sizeof(msg->msg) - msg->len);
+
+ mutex_lock(&adap->lock);
+ dprintk(2, "%s: %*ph\n", __func__, msg->len, msg->msg);
+
+ adap->last_initiator = 0xff;
+
+ /* Check if this message was for us (directed or broadcast). */
+ if (!cec_msg_is_broadcast(msg))
+ valid_la = cec_has_log_addr(adap, msg_dest);
+
+ /*
+ * Check if the length is not too short or if the message is a
+ * broadcast message where a directed message was expected or
+ * vice versa. If so, then the message has to be ignored (according
+ * to section CEC 7.3 and CEC 12.2).
+ */
+ if (valid_la && msg->len > 1 && cec_msg_size[cmd]) {
+ u8 dir_fl = cec_msg_size[cmd] & BOTH;
+
+ min_len = cec_msg_size[cmd] & 0x1f;
+ if (msg->len < min_len)
+ valid_la = false;
+ else if (!cec_msg_is_broadcast(msg) && !(dir_fl & DIRECTED))
+ valid_la = false;
+ else if (cec_msg_is_broadcast(msg) && !(dir_fl & BCAST))
+ valid_la = false;
+ else if (cec_msg_is_broadcast(msg) &&
+ adap->log_addrs.cec_version < CEC_OP_CEC_VERSION_2_0 &&
+ !(dir_fl & BCAST1_4))
+ valid_la = false;
+ }
+ if (valid_la && min_len) {
+ /* These messages have special length requirements */
+ switch (cmd) {
+ case CEC_MSG_TIMER_STATUS:
+ if (msg->msg[2] & 0x10) {
+ switch (msg->msg[2] & 0xf) {
+ case CEC_OP_PROG_INFO_NOT_ENOUGH_SPACE:
+ case CEC_OP_PROG_INFO_MIGHT_NOT_BE_ENOUGH_SPACE:
+ if (msg->len < 5)
+ valid_la = false;
+ break;
+ }
+ } else if ((msg->msg[2] & 0xf) == CEC_OP_PROG_ERROR_DUPLICATE) {
+ if (msg->len < 5)
+ valid_la = false;
+ }
+ break;
+ case CEC_MSG_RECORD_ON:
+ switch (msg->msg[2]) {
+ case CEC_OP_RECORD_SRC_OWN:
+ break;
+ case CEC_OP_RECORD_SRC_DIGITAL:
+ if (msg->len < 10)
+ valid_la = false;
+ break;
+ case CEC_OP_RECORD_SRC_ANALOG:
+ if (msg->len < 7)
+ valid_la = false;
+ break;
+ case CEC_OP_RECORD_SRC_EXT_PLUG:
+ if (msg->len < 4)
+ valid_la = false;
+ break;
+ case CEC_OP_RECORD_SRC_EXT_PHYS_ADDR:
+ if (msg->len < 5)
+ valid_la = false;
+ break;
+ }
+ break;
+ }
+ }
+
+ /* It's a valid message and not a poll or CDC message */
+ if (valid_la && msg->len > 1 && cmd != CEC_MSG_CDC_MESSAGE) {
+ bool abort = cmd == CEC_MSG_FEATURE_ABORT;
+
+ /* The aborted command is in msg[2] */
+ if (abort)
+ cmd = msg->msg[2];
+
+ /*
+ * Walk over all transmitted messages that are waiting for a
+ * reply.
+ */
+ list_for_each_entry(data, &adap->wait_queue, list) {
+ struct cec_msg *dst = &data->msg;
+
+ /*
+ * The *only* CEC message that has two possible replies
+ * is CEC_MSG_INITIATE_ARC.
+ * In this case allow either of the two replies.
+ */
+ if (!abort && dst->msg[1] == CEC_MSG_INITIATE_ARC &&
+ (cmd == CEC_MSG_REPORT_ARC_INITIATED ||
+ cmd == CEC_MSG_REPORT_ARC_TERMINATED) &&
+ (dst->reply == CEC_MSG_REPORT_ARC_INITIATED ||
+ dst->reply == CEC_MSG_REPORT_ARC_TERMINATED))
+ dst->reply = cmd;
+
+ /* Does the command match? */
+ if ((abort && cmd != dst->msg[1]) ||
+ (!abort && cmd != dst->reply))
+ continue;
+
+ /* Does the addressing match? */
+ if (msg_init != cec_msg_destination(dst) &&
+ !cec_msg_is_broadcast(dst))
+ continue;
+
+ /* We got a reply */
+ memcpy(dst->msg, msg->msg, msg->len);
+ dst->len = msg->len;
+ dst->rx_ts = msg->rx_ts;
+ dst->rx_status = msg->rx_status;
+ if (abort)
+ dst->rx_status |= CEC_RX_STATUS_FEATURE_ABORT;
+ msg->flags = dst->flags;
+ /* Remove it from the wait_queue */
+ list_del_init(&data->list);
+
+ /* Cancel the pending timeout work */
+ if (!cancel_delayed_work(&data->work)) {
+ mutex_unlock(&adap->lock);
+ flush_scheduled_work();
+ mutex_lock(&adap->lock);
+ }
+ /*
+ * Mark this as a reply, provided someone is still
+ * waiting for the answer.
+ */
+ if (data->fh)
+ is_reply = true;
+ cec_data_completed(data);
+ break;
+ }
+ }
+ mutex_unlock(&adap->lock);
+
+ /* Pass the message on to any monitoring filehandles */
+ cec_queue_msg_monitor(adap, msg, valid_la);
+
+ /* We're done if it is not for us or a poll message */
+ if (!valid_la || msg->len <= 1)
+ return;
+
+ if (adap->log_addrs.log_addr_mask == 0)
+ return;
+
+ /*
+ * Process the message on the protocol level. If is_reply is true,
+ * then cec_receive_notify() won't pass on the reply to the listener(s)
+ * since that was already done by cec_data_completed() above.
+ */
+ cec_receive_notify(adap, msg, is_reply);
+}
+EXPORT_SYMBOL_GPL(cec_received_msg_ts);
+
+/* Logical Address Handling */
+
+/*
+ * Attempt to claim a specific logical address.
+ *
+ * This function is called with adap->lock held.
+ */
+static int cec_config_log_addr(struct cec_adapter *adap,
+ unsigned int idx,
+ unsigned int log_addr)
+{
+ struct cec_log_addrs *las = &adap->log_addrs;
+ struct cec_msg msg = { };
+ const unsigned int max_retries = 2;
+ unsigned int i;
+ int err;
+
+ if (cec_has_log_addr(adap, log_addr))
+ return 0;
+
+ /* Send poll message */
+ msg.len = 1;
+ msg.msg[0] = (log_addr << 4) | log_addr;
+
+ for (i = 0; i < max_retries; i++) {
+ err = cec_transmit_msg_fh(adap, &msg, NULL, true);
+
+ /*
+ * While trying to poll the physical address was reset
+ * and the adapter was unconfigured, so bail out.
+ */
+ if (!adap->is_configuring)
+ return -EINTR;
+
+ if (err)
+ return err;
+
+ /*
+ * The message was aborted due to a disconnect or
+ * unconfigure, just bail out.
+ */
+ if (msg.tx_status & CEC_TX_STATUS_ABORTED)
+ return -EINTR;
+ if (msg.tx_status & CEC_TX_STATUS_OK)
+ return 0;
+ if (msg.tx_status & CEC_TX_STATUS_NACK)
+ break;
+ /*
+ * Retry up to max_retries times if the message was neither
+ * OKed or NACKed. This can happen due to e.g. a Lost
+ * Arbitration condition.
+ */
+ }
+
+ /*
+ * If we are unable to get an OK or a NACK after max_retries attempts
+ * (and note that each attempt already consists of four polls), then
+ * then we assume that something is really weird and that it is not a
+ * good idea to try and claim this logical address.
+ */
+ if (i == max_retries)
+ return 0;
+
+ /*
+ * Message not acknowledged, so this logical
+ * address is free to use.
+ */
+ err = adap->ops->adap_log_addr(adap, log_addr);
+ if (err)
+ return err;
+
+ las->log_addr[idx] = log_addr;
+ las->log_addr_mask |= 1 << log_addr;
+ adap->phys_addrs[log_addr] = adap->phys_addr;
+ return 1;
+}
+
+/*
+ * Unconfigure the adapter: clear all logical addresses and send
+ * the state changed event.
+ *
+ * This function is called with adap->lock held.
+ */
+static void cec_adap_unconfigure(struct cec_adapter *adap)
+{
+ if (!adap->needs_hpd ||
+ adap->phys_addr != CEC_PHYS_ADDR_INVALID)
+ WARN_ON(adap->ops->adap_log_addr(adap, CEC_LOG_ADDR_INVALID));
+ adap->log_addrs.log_addr_mask = 0;
+ adap->is_configuring = false;
+ adap->is_configured = false;
+ memset(adap->phys_addrs, 0xff, sizeof(adap->phys_addrs));
+ cec_flush(adap);
+ wake_up_interruptible(&adap->kthread_waitq);
+ cec_post_state_event(adap);
+}
+
+/*
+ * Attempt to claim the required logical addresses.
+ */
+static int cec_config_thread_func(void *arg)
+{
+ /* The various LAs for each type of device */
+ static const u8 tv_log_addrs[] = {
+ CEC_LOG_ADDR_TV, CEC_LOG_ADDR_SPECIFIC,
+ CEC_LOG_ADDR_INVALID
+ };
+ static const u8 record_log_addrs[] = {
+ CEC_LOG_ADDR_RECORD_1, CEC_LOG_ADDR_RECORD_2,
+ CEC_LOG_ADDR_RECORD_3,
+ CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2,
+ CEC_LOG_ADDR_INVALID
+ };
+ static const u8 tuner_log_addrs[] = {
+ CEC_LOG_ADDR_TUNER_1, CEC_LOG_ADDR_TUNER_2,
+ CEC_LOG_ADDR_TUNER_3, CEC_LOG_ADDR_TUNER_4,
+ CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2,
+ CEC_LOG_ADDR_INVALID
+ };
+ static const u8 playback_log_addrs[] = {
+ CEC_LOG_ADDR_PLAYBACK_1, CEC_LOG_ADDR_PLAYBACK_2,
+ CEC_LOG_ADDR_PLAYBACK_3,
+ CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2,
+ CEC_LOG_ADDR_INVALID
+ };
+ static const u8 audiosystem_log_addrs[] = {
+ CEC_LOG_ADDR_AUDIOSYSTEM,
+ CEC_LOG_ADDR_INVALID
+ };
+ static const u8 specific_use_log_addrs[] = {
+ CEC_LOG_ADDR_SPECIFIC,
+ CEC_LOG_ADDR_BACKUP_1, CEC_LOG_ADDR_BACKUP_2,
+ CEC_LOG_ADDR_INVALID
+ };
+ static const u8 *type2addrs[6] = {
+ [CEC_LOG_ADDR_TYPE_TV] = tv_log_addrs,
+ [CEC_LOG_ADDR_TYPE_RECORD] = record_log_addrs,
+ [CEC_LOG_ADDR_TYPE_TUNER] = tuner_log_addrs,
+ [CEC_LOG_ADDR_TYPE_PLAYBACK] = playback_log_addrs,
+ [CEC_LOG_ADDR_TYPE_AUDIOSYSTEM] = audiosystem_log_addrs,
+ [CEC_LOG_ADDR_TYPE_SPECIFIC] = specific_use_log_addrs,
+ };
+ static const u16 type2mask[] = {
+ [CEC_LOG_ADDR_TYPE_TV] = CEC_LOG_ADDR_MASK_TV,
+ [CEC_LOG_ADDR_TYPE_RECORD] = CEC_LOG_ADDR_MASK_RECORD,
+ [CEC_LOG_ADDR_TYPE_TUNER] = CEC_LOG_ADDR_MASK_TUNER,
+ [CEC_LOG_ADDR_TYPE_PLAYBACK] = CEC_LOG_ADDR_MASK_PLAYBACK,
+ [CEC_LOG_ADDR_TYPE_AUDIOSYSTEM] = CEC_LOG_ADDR_MASK_AUDIOSYSTEM,
+ [CEC_LOG_ADDR_TYPE_SPECIFIC] = CEC_LOG_ADDR_MASK_SPECIFIC,
+ };
+ struct cec_adapter *adap = arg;
+ struct cec_log_addrs *las = &adap->log_addrs;
+ int err;
+ int i, j;
+
+ mutex_lock(&adap->lock);
+ dprintk(1, "physical address: %x.%x.%x.%x, claim %d logical addresses\n",
+ cec_phys_addr_exp(adap->phys_addr), las->num_log_addrs);
+ las->log_addr_mask = 0;
+
+ if (las->log_addr_type[0] == CEC_LOG_ADDR_TYPE_UNREGISTERED)
+ goto configured;
+
+ for (i = 0; i < las->num_log_addrs; i++) {
+ unsigned int type = las->log_addr_type[i];
+ const u8 *la_list;
+ u8 last_la;
+
+ /*
+ * The TV functionality can only map to physical address 0.
+ * For any other address, try the Specific functionality
+ * instead as per the spec.
+ */
+ if (adap->phys_addr && type == CEC_LOG_ADDR_TYPE_TV)
+ type = CEC_LOG_ADDR_TYPE_SPECIFIC;
+
+ la_list = type2addrs[type];
+ last_la = las->log_addr[i];
+ las->log_addr[i] = CEC_LOG_ADDR_INVALID;
+ if (last_la == CEC_LOG_ADDR_INVALID ||
+ last_la == CEC_LOG_ADDR_UNREGISTERED ||
+ !((1 << last_la) & type2mask[type]))
+ last_la = la_list[0];
+
+ err = cec_config_log_addr(adap, i, last_la);
+ if (err > 0) /* Reused last LA */
+ continue;
+
+ if (err < 0)
+ goto unconfigure;
+
+ for (j = 0; la_list[j] != CEC_LOG_ADDR_INVALID; j++) {
+ /* Tried this one already, skip it */
+ if (la_list[j] == last_la)
+ continue;
+ /* The backup addresses are CEC 2.0 specific */
+ if ((la_list[j] == CEC_LOG_ADDR_BACKUP_1 ||
+ la_list[j] == CEC_LOG_ADDR_BACKUP_2) &&
+ las->cec_version < CEC_OP_CEC_VERSION_2_0)
+ continue;
+
+ err = cec_config_log_addr(adap, i, la_list[j]);
+ if (err == 0) /* LA is in use */
+ continue;
+ if (err < 0)
+ goto unconfigure;
+ /* Done, claimed an LA */
+ break;
+ }
+
+ if (la_list[j] == CEC_LOG_ADDR_INVALID)
+ dprintk(1, "could not claim LA %d\n", i);
+ }
+
+ if (adap->log_addrs.log_addr_mask == 0 &&
+ !(las->flags & CEC_LOG_ADDRS_FL_ALLOW_UNREG_FALLBACK))
+ goto unconfigure;
+
+configured:
+ if (adap->log_addrs.log_addr_mask == 0) {
+ /* Fall back to unregistered */
+ las->log_addr[0] = CEC_LOG_ADDR_UNREGISTERED;
+ las->log_addr_mask = 1 << las->log_addr[0];
+ for (i = 1; i < las->num_log_addrs; i++)
+ las->log_addr[i] = CEC_LOG_ADDR_INVALID;
+ }
+ for (i = las->num_log_addrs; i < CEC_MAX_LOG_ADDRS; i++)
+ las->log_addr[i] = CEC_LOG_ADDR_INVALID;
+ adap->is_configured = true;
+ adap->is_configuring = false;
+ cec_post_state_event(adap);
+
+ /*
+ * Now post the Report Features and Report Physical Address broadcast
+ * messages. Note that these are non-blocking transmits, meaning that
+ * they are just queued up and once adap->lock is unlocked the main
+ * thread will kick in and start transmitting these.
+ *
+ * If after this function is done (but before one or more of these
+ * messages are actually transmitted) the CEC adapter is unconfigured,
+ * then any remaining messages will be dropped by the main thread.
+ */
+ for (i = 0; i < las->num_log_addrs; i++) {
+ struct cec_msg msg = {};
+
+ if (las->log_addr[i] == CEC_LOG_ADDR_INVALID ||
+ (las->flags & CEC_LOG_ADDRS_FL_CDC_ONLY))
+ continue;
+
+ msg.msg[0] = (las->log_addr[i] << 4) | 0x0f;
+
+ /* Report Features must come first according to CEC 2.0 */
+ if (las->log_addr[i] != CEC_LOG_ADDR_UNREGISTERED &&
+ adap->log_addrs.cec_version >= CEC_OP_CEC_VERSION_2_0) {
+ cec_fill_msg_report_features(adap, &msg, i);
+ cec_transmit_msg_fh(adap, &msg, NULL, false);
+ }
+
+ /* Report Physical Address */
+ cec_msg_report_physical_addr(&msg, adap->phys_addr,
+ las->primary_device_type[i]);
+ dprintk(1, "config: la %d pa %x.%x.%x.%x\n",
+ las->log_addr[i],
+ cec_phys_addr_exp(adap->phys_addr));
+ cec_transmit_msg_fh(adap, &msg, NULL, false);
+
+ /* Report Vendor ID */
+ if (adap->log_addrs.vendor_id != CEC_VENDOR_ID_NONE) {
+ cec_msg_device_vendor_id(&msg,
+ adap->log_addrs.vendor_id);
+ cec_transmit_msg_fh(adap, &msg, NULL, false);
+ }
+ }
+ adap->kthread_config = NULL;
+ complete(&adap->config_completion);
+ mutex_unlock(&adap->lock);
+ return 0;
+
+unconfigure:
+ for (i = 0; i < las->num_log_addrs; i++)
+ las->log_addr[i] = CEC_LOG_ADDR_INVALID;
+ cec_adap_unconfigure(adap);
+ adap->kthread_config = NULL;
+ mutex_unlock(&adap->lock);
+ complete(&adap->config_completion);
+ return 0;
+}
+
+/*
+ * Called from either __cec_s_phys_addr or __cec_s_log_addrs to claim the
+ * logical addresses.
+ *
+ * This function is called with adap->lock held.
+ */
+static void cec_claim_log_addrs(struct cec_adapter *adap, bool block)
+{
+ if (WARN_ON(adap->is_configuring || adap->is_configured))
+ return;
+
+ init_completion(&adap->config_completion);
+
+ /* Ready to kick off the thread */
+ adap->is_configuring = true;
+ adap->kthread_config = kthread_run(cec_config_thread_func, adap,
+ "ceccfg-%s", adap->name);
+ if (IS_ERR(adap->kthread_config)) {
+ adap->kthread_config = NULL;
+ } else if (block) {
+ mutex_unlock(&adap->lock);
+ wait_for_completion(&adap->config_completion);
+ mutex_lock(&adap->lock);
+ }
+}
+
+/* Set a new physical address and send an event notifying userspace of this.
+ *
+ * This function is called with adap->lock held.
+ */
+void __cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block)
+{
+ if (phys_addr == adap->phys_addr)
+ return;
+ if (phys_addr != CEC_PHYS_ADDR_INVALID && adap->devnode.unregistered)
+ return;
+
+ dprintk(1, "new physical address %x.%x.%x.%x\n",
+ cec_phys_addr_exp(phys_addr));
+ if (phys_addr == CEC_PHYS_ADDR_INVALID ||
+ adap->phys_addr != CEC_PHYS_ADDR_INVALID) {
+ adap->phys_addr = CEC_PHYS_ADDR_INVALID;
+ cec_post_state_event(adap);
+ cec_adap_unconfigure(adap);
+ /* Disabling monitor all mode should always succeed */
+ if (adap->monitor_all_cnt)
+ WARN_ON(call_op(adap, adap_monitor_all_enable, false));
+ mutex_lock(&adap->devnode.lock);
+ if (adap->needs_hpd || list_empty(&adap->devnode.fhs)) {
+ WARN_ON(adap->ops->adap_enable(adap, false));
+ adap->transmit_in_progress = false;
+ wake_up_interruptible(&adap->kthread_waitq);
+ }
+ mutex_unlock(&adap->devnode.lock);
+ if (phys_addr == CEC_PHYS_ADDR_INVALID)
+ return;
+ }
+
+ mutex_lock(&adap->devnode.lock);
+ adap->last_initiator = 0xff;
+ adap->transmit_in_progress = false;
+
+ if ((adap->needs_hpd || list_empty(&adap->devnode.fhs)) &&
+ adap->ops->adap_enable(adap, true)) {
+ mutex_unlock(&adap->devnode.lock);
+ return;
+ }
+
+ if (adap->monitor_all_cnt &&
+ call_op(adap, adap_monitor_all_enable, true)) {
+ if (adap->needs_hpd || list_empty(&adap->devnode.fhs))
+ WARN_ON(adap->ops->adap_enable(adap, false));
+ mutex_unlock(&adap->devnode.lock);
+ return;
+ }
+ mutex_unlock(&adap->devnode.lock);
+
+ adap->phys_addr = phys_addr;
+ cec_post_state_event(adap);
+ if (adap->log_addrs.num_log_addrs)
+ cec_claim_log_addrs(adap, block);
+}
+
+void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block)
+{
+ if (IS_ERR_OR_NULL(adap))
+ return;
+
+ mutex_lock(&adap->lock);
+ __cec_s_phys_addr(adap, phys_addr, block);
+ mutex_unlock(&adap->lock);
+}
+EXPORT_SYMBOL_GPL(cec_s_phys_addr);
+
+void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
+ const struct edid *edid)
+{
+ u16 pa = CEC_PHYS_ADDR_INVALID;
+
+ if (edid && edid->extensions)
+ pa = cec_get_edid_phys_addr((const u8 *)edid,
+ EDID_LENGTH * (edid->extensions + 1), NULL);
+ cec_s_phys_addr(adap, pa, false);
+}
+EXPORT_SYMBOL_GPL(cec_s_phys_addr_from_edid);
+
+void cec_s_conn_info(struct cec_adapter *adap,
+ const struct cec_connector_info *conn_info)
+{
+ if (IS_ERR_OR_NULL(adap))
+ return;
+
+ if (!(adap->capabilities & CEC_CAP_CONNECTOR_INFO))
+ return;
+
+ mutex_lock(&adap->lock);
+ if (conn_info)
+ adap->conn_info = *conn_info;
+ else
+ memset(&adap->conn_info, 0, sizeof(adap->conn_info));
+ cec_post_state_event(adap);
+ mutex_unlock(&adap->lock);
+}
+EXPORT_SYMBOL_GPL(cec_s_conn_info);
+
+/*
+ * Called from either the ioctl or a driver to set the logical addresses.
+ *
+ * This function is called with adap->lock held.
+ */
+int __cec_s_log_addrs(struct cec_adapter *adap,
+ struct cec_log_addrs *log_addrs, bool block)
+{
+ u16 type_mask = 0;
+ int i;
+
+ if (adap->devnode.unregistered)
+ return -ENODEV;
+
+ if (!log_addrs || log_addrs->num_log_addrs == 0) {
+ cec_adap_unconfigure(adap);
+ adap->log_addrs.num_log_addrs = 0;
+ for (i = 0; i < CEC_MAX_LOG_ADDRS; i++)
+ adap->log_addrs.log_addr[i] = CEC_LOG_ADDR_INVALID;
+ adap->log_addrs.osd_name[0] = '\0';
+ adap->log_addrs.vendor_id = CEC_VENDOR_ID_NONE;
+ adap->log_addrs.cec_version = CEC_OP_CEC_VERSION_2_0;
+ return 0;
+ }
+
+ if (log_addrs->flags & CEC_LOG_ADDRS_FL_CDC_ONLY) {
+ /*
+ * Sanitize log_addrs fields if a CDC-Only device is
+ * requested.
+ */
+ log_addrs->num_log_addrs = 1;
+ log_addrs->osd_name[0] = '\0';
+ log_addrs->vendor_id = CEC_VENDOR_ID_NONE;
+ log_addrs->log_addr_type[0] = CEC_LOG_ADDR_TYPE_UNREGISTERED;
+ /*
+ * This is just an internal convention since a CDC-Only device
+ * doesn't have to be a switch. But switches already use
+ * unregistered, so it makes some kind of sense to pick this
+ * as the primary device. Since a CDC-Only device never sends
+ * any 'normal' CEC messages this primary device type is never
+ * sent over the CEC bus.
+ */
+ log_addrs->primary_device_type[0] = CEC_OP_PRIM_DEVTYPE_SWITCH;
+ log_addrs->all_device_types[0] = 0;
+ log_addrs->features[0][0] = 0;
+ log_addrs->features[0][1] = 0;
+ }
+
+ /* Ensure the osd name is 0-terminated */
+ log_addrs->osd_name[sizeof(log_addrs->osd_name) - 1] = '\0';
+
+ /* Sanity checks */
+ if (log_addrs->num_log_addrs > adap->available_log_addrs) {
+ dprintk(1, "num_log_addrs > %d\n", adap->available_log_addrs);
+ return -EINVAL;
+ }
+
+ /*
+ * Vendor ID is a 24 bit number, so check if the value is
+ * within the correct range.
+ */
+ if (log_addrs->vendor_id != CEC_VENDOR_ID_NONE &&
+ (log_addrs->vendor_id & 0xff000000) != 0) {
+ dprintk(1, "invalid vendor ID\n");
+ return -EINVAL;
+ }
+
+ if (log_addrs->cec_version != CEC_OP_CEC_VERSION_1_4 &&
+ log_addrs->cec_version != CEC_OP_CEC_VERSION_2_0) {
+ dprintk(1, "invalid CEC version\n");
+ return -EINVAL;
+ }
+
+ if (log_addrs->num_log_addrs > 1)
+ for (i = 0; i < log_addrs->num_log_addrs; i++)
+ if (log_addrs->log_addr_type[i] ==
+ CEC_LOG_ADDR_TYPE_UNREGISTERED) {
+ dprintk(1, "num_log_addrs > 1 can't be combined with unregistered LA\n");
+ return -EINVAL;
+ }
+
+ for (i = 0; i < log_addrs->num_log_addrs; i++) {
+ const u8 feature_sz = ARRAY_SIZE(log_addrs->features[0]);
+ u8 *features = log_addrs->features[i];
+ bool op_is_dev_features = false;
+ unsigned j;
+
+ log_addrs->log_addr[i] = CEC_LOG_ADDR_INVALID;
+ if (type_mask & (1 << log_addrs->log_addr_type[i])) {
+ dprintk(1, "duplicate logical address type\n");
+ return -EINVAL;
+ }
+ type_mask |= 1 << log_addrs->log_addr_type[i];
+ if ((type_mask & (1 << CEC_LOG_ADDR_TYPE_RECORD)) &&
+ (type_mask & (1 << CEC_LOG_ADDR_TYPE_PLAYBACK))) {
+ /* Record already contains the playback functionality */
+ dprintk(1, "invalid record + playback combination\n");
+ return -EINVAL;
+ }
+ if (log_addrs->primary_device_type[i] >
+ CEC_OP_PRIM_DEVTYPE_PROCESSOR) {
+ dprintk(1, "unknown primary device type\n");
+ return -EINVAL;
+ }
+ if (log_addrs->primary_device_type[i] == 2) {
+ dprintk(1, "invalid primary device type\n");
+ return -EINVAL;
+ }
+ if (log_addrs->log_addr_type[i] > CEC_LOG_ADDR_TYPE_UNREGISTERED) {
+ dprintk(1, "unknown logical address type\n");
+ return -EINVAL;
+ }
+ for (j = 0; j < feature_sz; j++) {
+ if ((features[j] & 0x80) == 0) {
+ if (op_is_dev_features)
+ break;
+ op_is_dev_features = true;
+ }
+ }
+ if (!op_is_dev_features || j == feature_sz) {
+ dprintk(1, "malformed features\n");
+ return -EINVAL;
+ }
+ /* Zero unused part of the feature array */
+ memset(features + j + 1, 0, feature_sz - j - 1);
+ }
+
+ if (log_addrs->cec_version >= CEC_OP_CEC_VERSION_2_0) {
+ if (log_addrs->num_log_addrs > 2) {
+ dprintk(1, "CEC 2.0 allows no more than 2 logical addresses\n");
+ return -EINVAL;
+ }
+ if (log_addrs->num_log_addrs == 2) {
+ if (!(type_mask & ((1 << CEC_LOG_ADDR_TYPE_AUDIOSYSTEM) |
+ (1 << CEC_LOG_ADDR_TYPE_TV)))) {
+ dprintk(1, "two LAs is only allowed for audiosystem and TV\n");
+ return -EINVAL;
+ }
+ if (!(type_mask & ((1 << CEC_LOG_ADDR_TYPE_PLAYBACK) |
+ (1 << CEC_LOG_ADDR_TYPE_RECORD)))) {
+ dprintk(1, "an audiosystem/TV can only be combined with record or playback\n");
+ return -EINVAL;
+ }
+ }
+ }
+
+ /* Zero unused LAs */
+ for (i = log_addrs->num_log_addrs; i < CEC_MAX_LOG_ADDRS; i++) {
+ log_addrs->primary_device_type[i] = 0;
+ log_addrs->log_addr_type[i] = 0;
+ log_addrs->all_device_types[i] = 0;
+ memset(log_addrs->features[i], 0,
+ sizeof(log_addrs->features[i]));
+ }
+
+ log_addrs->log_addr_mask = adap->log_addrs.log_addr_mask;
+ adap->log_addrs = *log_addrs;
+ if (adap->phys_addr != CEC_PHYS_ADDR_INVALID)
+ cec_claim_log_addrs(adap, block);
+ return 0;
+}
+
+int cec_s_log_addrs(struct cec_adapter *adap,
+ struct cec_log_addrs *log_addrs, bool block)
+{
+ int err;
+
+ mutex_lock(&adap->lock);
+ err = __cec_s_log_addrs(adap, log_addrs, block);
+ mutex_unlock(&adap->lock);
+ return err;
+}
+EXPORT_SYMBOL_GPL(cec_s_log_addrs);
+
+/* High-level core CEC message handling */
+
+/* Fill in the Report Features message */
+static void cec_fill_msg_report_features(struct cec_adapter *adap,
+ struct cec_msg *msg,
+ unsigned int la_idx)
+{
+ const struct cec_log_addrs *las = &adap->log_addrs;
+ const u8 *features = las->features[la_idx];
+ bool op_is_dev_features = false;
+ unsigned int idx;
+
+ /* Report Features */
+ msg->msg[0] = (las->log_addr[la_idx] << 4) | 0x0f;
+ msg->len = 4;
+ msg->msg[1] = CEC_MSG_REPORT_FEATURES;
+ msg->msg[2] = adap->log_addrs.cec_version;
+ msg->msg[3] = las->all_device_types[la_idx];
+
+ /* Write RC Profiles first, then Device Features */
+ for (idx = 0; idx < ARRAY_SIZE(las->features[0]); idx++) {
+ msg->msg[msg->len++] = features[idx];
+ if ((features[idx] & CEC_OP_FEAT_EXT) == 0) {
+ if (op_is_dev_features)
+ break;
+ op_is_dev_features = true;
+ }
+ }
+}
+
+/* Transmit the Feature Abort message */
+static int cec_feature_abort_reason(struct cec_adapter *adap,
+ struct cec_msg *msg, u8 reason)
+{
+ struct cec_msg tx_msg = { };
+
+ /*
+ * Don't reply with CEC_MSG_FEATURE_ABORT to a CEC_MSG_FEATURE_ABORT
+ * message!
+ */
+ if (msg->msg[1] == CEC_MSG_FEATURE_ABORT)
+ return 0;
+ /* Don't Feature Abort messages from 'Unregistered' */
+ if (cec_msg_initiator(msg) == CEC_LOG_ADDR_UNREGISTERED)
+ return 0;
+ cec_msg_set_reply_to(&tx_msg, msg);
+ cec_msg_feature_abort(&tx_msg, msg->msg[1], reason);
+ return cec_transmit_msg(adap, &tx_msg, false);
+}
+
+static int cec_feature_abort(struct cec_adapter *adap, struct cec_msg *msg)
+{
+ return cec_feature_abort_reason(adap, msg,
+ CEC_OP_ABORT_UNRECOGNIZED_OP);
+}
+
+static int cec_feature_refused(struct cec_adapter *adap, struct cec_msg *msg)
+{
+ return cec_feature_abort_reason(adap, msg,
+ CEC_OP_ABORT_REFUSED);
+}
+
+/*
+ * Called when a CEC message is received. This function will do any
+ * necessary core processing. The is_reply bool is true if this message
+ * is a reply to an earlier transmit.
+ *
+ * The message is either a broadcast message or a valid directed message.
+ */
+static int cec_receive_notify(struct cec_adapter *adap, struct cec_msg *msg,
+ bool is_reply)
+{
+ bool is_broadcast = cec_msg_is_broadcast(msg);
+ u8 dest_laddr = cec_msg_destination(msg);
+ u8 init_laddr = cec_msg_initiator(msg);
+ u8 devtype = cec_log_addr2dev(adap, dest_laddr);
+ int la_idx = cec_log_addr2idx(adap, dest_laddr);
+ bool from_unregistered = init_laddr == 0xf;
+ struct cec_msg tx_cec_msg = { };
+
+ dprintk(2, "%s: %*ph\n", __func__, msg->len, msg->msg);
+
+ /* If this is a CDC-Only device, then ignore any non-CDC messages */
+ if (cec_is_cdc_only(&adap->log_addrs) &&
+ msg->msg[1] != CEC_MSG_CDC_MESSAGE)
+ return 0;
+
+ if (adap->ops->received) {
+ /* Allow drivers to process the message first */
+ if (adap->ops->received(adap, msg) != -ENOMSG)
+ return 0;
+ }
+
+ /*
+ * REPORT_PHYSICAL_ADDR, CEC_MSG_USER_CONTROL_PRESSED and
+ * CEC_MSG_USER_CONTROL_RELEASED messages always have to be
+ * handled by the CEC core, even if the passthrough mode is on.
+ * The others are just ignored if passthrough mode is on.
+ */
+ switch (msg->msg[1]) {
+ case CEC_MSG_GET_CEC_VERSION:
+ case CEC_MSG_ABORT:
+ case CEC_MSG_GIVE_DEVICE_POWER_STATUS:
+ case CEC_MSG_GIVE_OSD_NAME:
+ /*
+ * These messages reply with a directed message, so ignore if
+ * the initiator is Unregistered.
+ */
+ if (!adap->passthrough && from_unregistered)
+ return 0;
+ /* Fall through */
+ case CEC_MSG_GIVE_DEVICE_VENDOR_ID:
+ case CEC_MSG_GIVE_FEATURES:
+ case CEC_MSG_GIVE_PHYSICAL_ADDR:
+ /*
+ * Skip processing these messages if the passthrough mode
+ * is on.
+ */
+ if (adap->passthrough)
+ goto skip_processing;
+ /* Ignore if addressing is wrong */
+ if (is_broadcast)
+ return 0;
+ break;
+
+ case CEC_MSG_USER_CONTROL_PRESSED:
+ case CEC_MSG_USER_CONTROL_RELEASED:
+ /* Wrong addressing mode: don't process */
+ if (is_broadcast || from_unregistered)
+ goto skip_processing;
+ break;
+
+ case CEC_MSG_REPORT_PHYSICAL_ADDR:
+ /*
+ * This message is always processed, regardless of the
+ * passthrough setting.
+ *
+ * Exception: don't process if wrong addressing mode.
+ */
+ if (!is_broadcast)
+ goto skip_processing;
+ break;
+
+ default:
+ break;
+ }
+
+ cec_msg_set_reply_to(&tx_cec_msg, msg);
+
+ switch (msg->msg[1]) {
+ /* The following messages are processed but still passed through */
+ case CEC_MSG_REPORT_PHYSICAL_ADDR: {
+ u16 pa = (msg->msg[2] << 8) | msg->msg[3];
+
+ if (!from_unregistered)
+ adap->phys_addrs[init_laddr] = pa;
+ dprintk(1, "reported physical address %x.%x.%x.%x for logical address %d\n",
+ cec_phys_addr_exp(pa), init_laddr);
+ break;
+ }
+
+ case CEC_MSG_USER_CONTROL_PRESSED:
+ if (!(adap->capabilities & CEC_CAP_RC) ||
+ !(adap->log_addrs.flags & CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU))
+ break;
+
+#ifdef CONFIG_MEDIA_CEC_RC
+ switch (msg->msg[2]) {
+ /*
+ * Play function, this message can have variable length
+ * depending on the specific play function that is used.
+ */
+ case CEC_OP_UI_CMD_PLAY_FUNCTION:
+ if (msg->len == 2)
+ rc_keydown(adap->rc, RC_PROTO_CEC,
+ msg->msg[2], 0);
+ else
+ rc_keydown(adap->rc, RC_PROTO_CEC,
+ msg->msg[2] << 8 | msg->msg[3], 0);
+ break;
+ /*
+ * Other function messages that are not handled.
+ * Currently the RC framework does not allow to supply an
+ * additional parameter to a keypress. These "keys" contain
+ * other information such as channel number, an input number
+ * etc.
+ * For the time being these messages are not processed by the
+ * framework and are simply forwarded to the user space.
+ */
+ case CEC_OP_UI_CMD_SELECT_BROADCAST_TYPE:
+ case CEC_OP_UI_CMD_SELECT_SOUND_PRESENTATION:
+ case CEC_OP_UI_CMD_TUNE_FUNCTION:
+ case CEC_OP_UI_CMD_SELECT_MEDIA_FUNCTION:
+ case CEC_OP_UI_CMD_SELECT_AV_INPUT_FUNCTION:
+ case CEC_OP_UI_CMD_SELECT_AUDIO_INPUT_FUNCTION:
+ break;
+ default:
+ rc_keydown(adap->rc, RC_PROTO_CEC, msg->msg[2], 0);
+ break;
+ }
+#endif
+ break;
+
+ case CEC_MSG_USER_CONTROL_RELEASED:
+ if (!(adap->capabilities & CEC_CAP_RC) ||
+ !(adap->log_addrs.flags & CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU))
+ break;
+#ifdef CONFIG_MEDIA_CEC_RC
+ rc_keyup(adap->rc);
+#endif
+ break;
+
+ /*
+ * The remaining messages are only processed if the passthrough mode
+ * is off.
+ */
+ case CEC_MSG_GET_CEC_VERSION:
+ cec_msg_cec_version(&tx_cec_msg, adap->log_addrs.cec_version);
+ return cec_transmit_msg(adap, &tx_cec_msg, false);
+
+ case CEC_MSG_GIVE_PHYSICAL_ADDR:
+ /* Do nothing for CEC switches using addr 15 */
+ if (devtype == CEC_OP_PRIM_DEVTYPE_SWITCH && dest_laddr == 15)
+ return 0;
+ cec_msg_report_physical_addr(&tx_cec_msg, adap->phys_addr, devtype);
+ return cec_transmit_msg(adap, &tx_cec_msg, false);
+
+ case CEC_MSG_GIVE_DEVICE_VENDOR_ID:
+ if (adap->log_addrs.vendor_id == CEC_VENDOR_ID_NONE)
+ return cec_feature_abort(adap, msg);
+ cec_msg_device_vendor_id(&tx_cec_msg, adap->log_addrs.vendor_id);
+ return cec_transmit_msg(adap, &tx_cec_msg, false);
+
+ case CEC_MSG_ABORT:
+ /* Do nothing for CEC switches */
+ if (devtype == CEC_OP_PRIM_DEVTYPE_SWITCH)
+ return 0;
+ return cec_feature_refused(adap, msg);
+
+ case CEC_MSG_GIVE_OSD_NAME: {
+ if (adap->log_addrs.osd_name[0] == 0)
+ return cec_feature_abort(adap, msg);
+ cec_msg_set_osd_name(&tx_cec_msg, adap->log_addrs.osd_name);
+ return cec_transmit_msg(adap, &tx_cec_msg, false);
+ }
+
+ case CEC_MSG_GIVE_FEATURES:
+ if (adap->log_addrs.cec_version < CEC_OP_CEC_VERSION_2_0)
+ return cec_feature_abort(adap, msg);
+ cec_fill_msg_report_features(adap, &tx_cec_msg, la_idx);
+ return cec_transmit_msg(adap, &tx_cec_msg, false);
+
+ default:
+ /*
+ * Unprocessed messages are aborted if userspace isn't doing
+ * any processing either.
+ */
+ if (!is_broadcast && !is_reply && !adap->follower_cnt &&
+ !adap->cec_follower && msg->msg[1] != CEC_MSG_FEATURE_ABORT)
+ return cec_feature_abort(adap, msg);
+ break;
+ }
+
+skip_processing:
+ /* If this was a reply, then we're done, unless otherwise specified */
+ if (is_reply && !(msg->flags & CEC_MSG_FL_REPLY_TO_FOLLOWERS))
+ return 0;
+
+ /*
+ * Send to the exclusive follower if there is one, otherwise send
+ * to all followers.
+ */
+ if (adap->cec_follower)
+ cec_queue_msg_fh(adap->cec_follower, msg);
+ else
+ cec_queue_msg_followers(adap, msg);
+ return 0;
+}
+
+/*
+ * Helper functions to keep track of the 'monitor all' use count.
+ *
+ * These functions are called with adap->lock held.
+ */
+int cec_monitor_all_cnt_inc(struct cec_adapter *adap)
+{
+ int ret = 0;
+
+ if (adap->monitor_all_cnt == 0)
+ ret = call_op(adap, adap_monitor_all_enable, 1);
+ if (ret == 0)
+ adap->monitor_all_cnt++;
+ return ret;
+}
+
+void cec_monitor_all_cnt_dec(struct cec_adapter *adap)
+{
+ adap->monitor_all_cnt--;
+ if (adap->monitor_all_cnt == 0)
+ WARN_ON(call_op(adap, adap_monitor_all_enable, 0));
+}
+
+/*
+ * Helper functions to keep track of the 'monitor pin' use count.
+ *
+ * These functions are called with adap->lock held.
+ */
+int cec_monitor_pin_cnt_inc(struct cec_adapter *adap)
+{
+ int ret = 0;
+
+ if (adap->monitor_pin_cnt == 0)
+ ret = call_op(adap, adap_monitor_pin_enable, 1);
+ if (ret == 0)
+ adap->monitor_pin_cnt++;
+ return ret;
+}
+
+void cec_monitor_pin_cnt_dec(struct cec_adapter *adap)
+{
+ adap->monitor_pin_cnt--;
+ if (adap->monitor_pin_cnt == 0)
+ WARN_ON(call_op(adap, adap_monitor_pin_enable, 0));
+}
+
+#ifdef CONFIG_DEBUG_FS
+/*
+ * Log the current state of the CEC adapter.
+ * Very useful for debugging.
+ */
+int cec_adap_status(struct seq_file *file, void *priv)
+{
+ struct cec_adapter *adap = dev_get_drvdata(file->private);
+ struct cec_data *data;
+
+ mutex_lock(&adap->lock);
+ seq_printf(file, "configured: %d\n", adap->is_configured);
+ seq_printf(file, "configuring: %d\n", adap->is_configuring);
+ seq_printf(file, "phys_addr: %x.%x.%x.%x\n",
+ cec_phys_addr_exp(adap->phys_addr));
+ seq_printf(file, "number of LAs: %d\n", adap->log_addrs.num_log_addrs);
+ seq_printf(file, "LA mask: 0x%04x\n", adap->log_addrs.log_addr_mask);
+ if (adap->cec_follower)
+ seq_printf(file, "has CEC follower%s\n",
+ adap->passthrough ? " (in passthrough mode)" : "");
+ if (adap->cec_initiator)
+ seq_puts(file, "has CEC initiator\n");
+ if (adap->monitor_all_cnt)
+ seq_printf(file, "file handles in Monitor All mode: %u\n",
+ adap->monitor_all_cnt);
+ if (adap->tx_timeouts) {
+ seq_printf(file, "transmit timeouts: %u\n",
+ adap->tx_timeouts);
+ adap->tx_timeouts = 0;
+ }
+ data = adap->transmitting;
+ if (data)
+ seq_printf(file, "transmitting message: %*ph (reply: %02x, timeout: %ums)\n",
+ data->msg.len, data->msg.msg, data->msg.reply,
+ data->msg.timeout);
+ seq_printf(file, "pending transmits: %u\n", adap->transmit_queue_sz);
+ list_for_each_entry(data, &adap->transmit_queue, list) {
+ seq_printf(file, "queued tx message: %*ph (reply: %02x, timeout: %ums)\n",
+ data->msg.len, data->msg.msg, data->msg.reply,
+ data->msg.timeout);
+ }
+ list_for_each_entry(data, &adap->wait_queue, list) {
+ seq_printf(file, "message waiting for reply: %*ph (reply: %02x, timeout: %ums)\n",
+ data->msg.len, data->msg.msg, data->msg.reply,
+ data->msg.timeout);
+ }
+
+ call_void_op(adap, adap_status, file);
+ mutex_unlock(&adap->lock);
+ return 0;
+}
+#endif
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * cec-api.c - HDMI Consumer Electronics Control framework - API
+ *
+ * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/kmod.h>
+#include <linux/ktime.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/version.h>
+
+#include <media/cec-pin.h>
+#include "cec-priv.h"
+#include "cec-pin-priv.h"
+
+static inline struct cec_devnode *cec_devnode_data(struct file *filp)
+{
+ struct cec_fh *fh = filp->private_data;
+
+ return &fh->adap->devnode;
+}
+
+/* CEC file operations */
+
+static __poll_t cec_poll(struct file *filp,
+ struct poll_table_struct *poll)
+{
+ struct cec_fh *fh = filp->private_data;
+ struct cec_adapter *adap = fh->adap;
+ __poll_t res = 0;
+
+ poll_wait(filp, &fh->wait, poll);
+ if (!cec_is_registered(adap))
+ return EPOLLERR | EPOLLHUP;
+ mutex_lock(&adap->lock);
+ if (adap->is_configured &&
+ adap->transmit_queue_sz < CEC_MAX_MSG_TX_QUEUE_SZ)
+ res |= EPOLLOUT | EPOLLWRNORM;
+ if (fh->queued_msgs)
+ res |= EPOLLIN | EPOLLRDNORM;
+ if (fh->total_queued_events)
+ res |= EPOLLPRI;
+ mutex_unlock(&adap->lock);
+ return res;
+}
+
+static bool cec_is_busy(const struct cec_adapter *adap,
+ const struct cec_fh *fh)
+{
+ bool valid_initiator = adap->cec_initiator && adap->cec_initiator == fh;
+ bool valid_follower = adap->cec_follower && adap->cec_follower == fh;
+
+ /*
+ * Exclusive initiators and followers can always access the CEC adapter
+ */
+ if (valid_initiator || valid_follower)
+ return false;
+ /*
+ * All others can only access the CEC adapter if there is no
+ * exclusive initiator and they are in INITIATOR mode.
+ */
+ return adap->cec_initiator ||
+ fh->mode_initiator == CEC_MODE_NO_INITIATOR;
+}
+
+static long cec_adap_g_caps(struct cec_adapter *adap,
+ struct cec_caps __user *parg)
+{
+ struct cec_caps caps = {};
+
+ strscpy(caps.driver, adap->devnode.dev.parent->driver->name,
+ sizeof(caps.driver));
+ strscpy(caps.name, adap->name, sizeof(caps.name));
+ caps.available_log_addrs = adap->available_log_addrs;
+ caps.capabilities = adap->capabilities;
+ caps.version = LINUX_VERSION_CODE;
+ if (copy_to_user(parg, &caps, sizeof(caps)))
+ return -EFAULT;
+ return 0;
+}
+
+static long cec_adap_g_phys_addr(struct cec_adapter *adap,
+ __u16 __user *parg)
+{
+ u16 phys_addr;
+
+ mutex_lock(&adap->lock);
+ phys_addr = adap->phys_addr;
+ mutex_unlock(&adap->lock);
+ if (copy_to_user(parg, &phys_addr, sizeof(phys_addr)))
+ return -EFAULT;
+ return 0;
+}
+
+static int cec_validate_phys_addr(u16 phys_addr)
+{
+ int i;
+
+ if (phys_addr == CEC_PHYS_ADDR_INVALID)
+ return 0;
+ for (i = 0; i < 16; i += 4)
+ if (phys_addr & (0xf << i))
+ break;
+ if (i == 16)
+ return 0;
+ for (i += 4; i < 16; i += 4)
+ if ((phys_addr & (0xf << i)) == 0)
+ return -EINVAL;
+ return 0;
+}
+
+static long cec_adap_s_phys_addr(struct cec_adapter *adap, struct cec_fh *fh,
+ bool block, __u16 __user *parg)
+{
+ u16 phys_addr;
+ long err;
+
+ if (!(adap->capabilities & CEC_CAP_PHYS_ADDR))
+ return -ENOTTY;
+ if (copy_from_user(&phys_addr, parg, sizeof(phys_addr)))
+ return -EFAULT;
+
+ err = cec_validate_phys_addr(phys_addr);
+ if (err)
+ return err;
+ mutex_lock(&adap->lock);
+ if (cec_is_busy(adap, fh))
+ err = -EBUSY;
+ else
+ __cec_s_phys_addr(adap, phys_addr, block);
+ mutex_unlock(&adap->lock);
+ return err;
+}
+
+static long cec_adap_g_log_addrs(struct cec_adapter *adap,
+ struct cec_log_addrs __user *parg)
+{
+ struct cec_log_addrs log_addrs;
+
+ mutex_lock(&adap->lock);
+ log_addrs = adap->log_addrs;
+ if (!adap->is_configured)
+ memset(log_addrs.log_addr, CEC_LOG_ADDR_INVALID,
+ sizeof(log_addrs.log_addr));
+ mutex_unlock(&adap->lock);
+
+ if (copy_to_user(parg, &log_addrs, sizeof(log_addrs)))
+ return -EFAULT;
+ return 0;
+}
+
+static long cec_adap_s_log_addrs(struct cec_adapter *adap, struct cec_fh *fh,
+ bool block, struct cec_log_addrs __user *parg)
+{
+ struct cec_log_addrs log_addrs;
+ long err = -EBUSY;
+
+ if (!(adap->capabilities & CEC_CAP_LOG_ADDRS))
+ return -ENOTTY;
+ if (copy_from_user(&log_addrs, parg, sizeof(log_addrs)))
+ return -EFAULT;
+ log_addrs.flags &= CEC_LOG_ADDRS_FL_ALLOW_UNREG_FALLBACK |
+ CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU |
+ CEC_LOG_ADDRS_FL_CDC_ONLY;
+ mutex_lock(&adap->lock);
+ if (!adap->is_configuring &&
+ (!log_addrs.num_log_addrs || !adap->is_configured) &&
+ !cec_is_busy(adap, fh)) {
+ err = __cec_s_log_addrs(adap, &log_addrs, block);
+ if (!err)
+ log_addrs = adap->log_addrs;
+ }
+ mutex_unlock(&adap->lock);
+ if (err)
+ return err;
+ if (copy_to_user(parg, &log_addrs, sizeof(log_addrs)))
+ return -EFAULT;
+ return 0;
+}
+
+static long cec_adap_g_connector_info(struct cec_adapter *adap,
+ struct cec_log_addrs __user *parg)
+{
+ int ret = 0;
+
+ if (!(adap->capabilities & CEC_CAP_CONNECTOR_INFO))
+ return -ENOTTY;
+
+ mutex_lock(&adap->lock);
+ if (copy_to_user(parg, &adap->conn_info, sizeof(adap->conn_info)))
+ ret = -EFAULT;
+ mutex_unlock(&adap->lock);
+ return ret;
+}
+
+static long cec_transmit(struct cec_adapter *adap, struct cec_fh *fh,
+ bool block, struct cec_msg __user *parg)
+{
+ struct cec_msg msg = {};
+ long err = 0;
+
+ if (!(adap->capabilities & CEC_CAP_TRANSMIT))
+ return -ENOTTY;
+ if (copy_from_user(&msg, parg, sizeof(msg)))
+ return -EFAULT;
+
+ mutex_lock(&adap->lock);
+ if (adap->log_addrs.num_log_addrs == 0)
+ err = -EPERM;
+ else if (adap->is_configuring)
+ err = -ENONET;
+ else if (cec_is_busy(adap, fh))
+ err = -EBUSY;
+ else
+ err = cec_transmit_msg_fh(adap, &msg, fh, block);
+ mutex_unlock(&adap->lock);
+ if (err)
+ return err;
+ if (copy_to_user(parg, &msg, sizeof(msg)))
+ return -EFAULT;
+ return 0;
+}
+
+/* Called by CEC_RECEIVE: wait for a message to arrive */
+static int cec_receive_msg(struct cec_fh *fh, struct cec_msg *msg, bool block)
+{
+ u32 timeout = msg->timeout;
+ int res;
+
+ do {
+ mutex_lock(&fh->lock);
+ /* Are there received messages queued up? */
+ if (fh->queued_msgs) {
+ /* Yes, return the first one */
+ struct cec_msg_entry *entry =
+ list_first_entry(&fh->msgs,
+ struct cec_msg_entry, list);
+
+ list_del(&entry->list);
+ *msg = entry->msg;
+ kfree(entry);
+ fh->queued_msgs--;
+ mutex_unlock(&fh->lock);
+ /* restore original timeout value */
+ msg->timeout = timeout;
+ return 0;
+ }
+
+ /* No, return EAGAIN in non-blocking mode or wait */
+ mutex_unlock(&fh->lock);
+
+ /* Return when in non-blocking mode */
+ if (!block)
+ return -EAGAIN;
+
+ if (msg->timeout) {
+ /* The user specified a timeout */
+ res = wait_event_interruptible_timeout(fh->wait,
+ fh->queued_msgs,
+ msecs_to_jiffies(msg->timeout));
+ if (res == 0)
+ res = -ETIMEDOUT;
+ else if (res > 0)
+ res = 0;
+ } else {
+ /* Wait indefinitely */
+ res = wait_event_interruptible(fh->wait,
+ fh->queued_msgs);
+ }
+ /* Exit on error, otherwise loop to get the new message */
+ } while (!res);
+ return res;
+}
+
+static long cec_receive(struct cec_adapter *adap, struct cec_fh *fh,
+ bool block, struct cec_msg __user *parg)
+{
+ struct cec_msg msg = {};
+ long err;
+
+ if (copy_from_user(&msg, parg, sizeof(msg)))
+ return -EFAULT;
+
+ err = cec_receive_msg(fh, &msg, block);
+ if (err)
+ return err;
+ msg.flags = 0;
+ if (copy_to_user(parg, &msg, sizeof(msg)))
+ return -EFAULT;
+ return 0;
+}
+
+static long cec_dqevent(struct cec_adapter *adap, struct cec_fh *fh,
+ bool block, struct cec_event __user *parg)
+{
+ struct cec_event_entry *ev = NULL;
+ u64 ts = ~0ULL;
+ unsigned int i;
+ unsigned int ev_idx;
+ long err = 0;
+
+ mutex_lock(&fh->lock);
+ while (!fh->total_queued_events && block) {
+ mutex_unlock(&fh->lock);
+ err = wait_event_interruptible(fh->wait,
+ fh->total_queued_events);
+ if (err)
+ return err;
+ mutex_lock(&fh->lock);
+ }
+
+ /* Find the oldest event */
+ for (i = 0; i < CEC_NUM_EVENTS; i++) {
+ struct cec_event_entry *entry =
+ list_first_entry_or_null(&fh->events[i],
+ struct cec_event_entry, list);
+
+ if (entry && entry->ev.ts <= ts) {
+ ev = entry;
+ ev_idx = i;
+ ts = ev->ev.ts;
+ }
+ }
+
+ if (!ev) {
+ err = -EAGAIN;
+ goto unlock;
+ }
+ list_del(&ev->list);
+
+ if (copy_to_user(parg, &ev->ev, sizeof(ev->ev)))
+ err = -EFAULT;
+ if (ev_idx >= CEC_NUM_CORE_EVENTS)
+ kfree(ev);
+ fh->queued_events[ev_idx]--;
+ fh->total_queued_events--;
+
+unlock:
+ mutex_unlock(&fh->lock);
+ return err;
+}
+
+static long cec_g_mode(struct cec_adapter *adap, struct cec_fh *fh,
+ u32 __user *parg)
+{
+ u32 mode = fh->mode_initiator | fh->mode_follower;
+
+ if (copy_to_user(parg, &mode, sizeof(mode)))
+ return -EFAULT;
+ return 0;
+}
+
+static long cec_s_mode(struct cec_adapter *adap, struct cec_fh *fh,
+ u32 __user *parg)
+{
+ u32 mode;
+ u8 mode_initiator;
+ u8 mode_follower;
+ bool send_pin_event = false;
+ long err = 0;
+
+ if (copy_from_user(&mode, parg, sizeof(mode)))
+ return -EFAULT;
+ if (mode & ~(CEC_MODE_INITIATOR_MSK | CEC_MODE_FOLLOWER_MSK)) {
+ dprintk(1, "%s: invalid mode bits set\n", __func__);
+ return -EINVAL;
+ }
+
+ mode_initiator = mode & CEC_MODE_INITIATOR_MSK;
+ mode_follower = mode & CEC_MODE_FOLLOWER_MSK;
+
+ if (mode_initiator > CEC_MODE_EXCL_INITIATOR ||
+ mode_follower > CEC_MODE_MONITOR_ALL) {
+ dprintk(1, "%s: unknown mode\n", __func__);
+ return -EINVAL;
+ }
+
+ if (mode_follower == CEC_MODE_MONITOR_ALL &&
+ !(adap->capabilities & CEC_CAP_MONITOR_ALL)) {
+ dprintk(1, "%s: MONITOR_ALL not supported\n", __func__);
+ return -EINVAL;
+ }
+
+ if (mode_follower == CEC_MODE_MONITOR_PIN &&
+ !(adap->capabilities & CEC_CAP_MONITOR_PIN)) {
+ dprintk(1, "%s: MONITOR_PIN not supported\n", __func__);
+ return -EINVAL;
+ }
+
+ /* Follower modes should always be able to send CEC messages */
+ if ((mode_initiator == CEC_MODE_NO_INITIATOR ||
+ !(adap->capabilities & CEC_CAP_TRANSMIT)) &&
+ mode_follower >= CEC_MODE_FOLLOWER &&
+ mode_follower <= CEC_MODE_EXCL_FOLLOWER_PASSTHRU) {
+ dprintk(1, "%s: cannot transmit\n", __func__);
+ return -EINVAL;
+ }
+
+ /* Monitor modes require CEC_MODE_NO_INITIATOR */
+ if (mode_initiator && mode_follower >= CEC_MODE_MONITOR_PIN) {
+ dprintk(1, "%s: monitor modes require NO_INITIATOR\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ /* Monitor modes require CAP_NET_ADMIN */
+ if (mode_follower >= CEC_MODE_MONITOR_PIN && !capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ mutex_lock(&adap->lock);
+ /*
+ * You can't become exclusive follower if someone else already
+ * has that job.
+ */
+ if ((mode_follower == CEC_MODE_EXCL_FOLLOWER ||
+ mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU) &&
+ adap->cec_follower && adap->cec_follower != fh)
+ err = -EBUSY;
+ /*
+ * You can't become exclusive initiator if someone else already
+ * has that job.
+ */
+ if (mode_initiator == CEC_MODE_EXCL_INITIATOR &&
+ adap->cec_initiator && adap->cec_initiator != fh)
+ err = -EBUSY;
+
+ if (!err) {
+ bool old_mon_all = fh->mode_follower == CEC_MODE_MONITOR_ALL;
+ bool new_mon_all = mode_follower == CEC_MODE_MONITOR_ALL;
+
+ if (old_mon_all != new_mon_all) {
+ if (new_mon_all)
+ err = cec_monitor_all_cnt_inc(adap);
+ else
+ cec_monitor_all_cnt_dec(adap);
+ }
+ }
+
+ if (!err) {
+ bool old_mon_pin = fh->mode_follower == CEC_MODE_MONITOR_PIN;
+ bool new_mon_pin = mode_follower == CEC_MODE_MONITOR_PIN;
+
+ if (old_mon_pin != new_mon_pin) {
+ send_pin_event = new_mon_pin;
+ if (new_mon_pin)
+ err = cec_monitor_pin_cnt_inc(adap);
+ else
+ cec_monitor_pin_cnt_dec(adap);
+ }
+ }
+
+ if (err) {
+ mutex_unlock(&adap->lock);
+ return err;
+ }
+
+ if (fh->mode_follower == CEC_MODE_FOLLOWER)
+ adap->follower_cnt--;
+ if (mode_follower == CEC_MODE_FOLLOWER)
+ adap->follower_cnt++;
+ if (send_pin_event) {
+ struct cec_event ev = {
+ .flags = CEC_EVENT_FL_INITIAL_STATE,
+ };
+
+ ev.event = adap->cec_pin_is_high ? CEC_EVENT_PIN_CEC_HIGH :
+ CEC_EVENT_PIN_CEC_LOW;
+ cec_queue_event_fh(fh, &ev, 0);
+ }
+ if (mode_follower == CEC_MODE_EXCL_FOLLOWER ||
+ mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU) {
+ adap->passthrough =
+ mode_follower == CEC_MODE_EXCL_FOLLOWER_PASSTHRU;
+ adap->cec_follower = fh;
+ } else if (adap->cec_follower == fh) {
+ adap->passthrough = false;
+ adap->cec_follower = NULL;
+ }
+ if (mode_initiator == CEC_MODE_EXCL_INITIATOR)
+ adap->cec_initiator = fh;
+ else if (adap->cec_initiator == fh)
+ adap->cec_initiator = NULL;
+ fh->mode_initiator = mode_initiator;
+ fh->mode_follower = mode_follower;
+ mutex_unlock(&adap->lock);
+ return 0;
+}
+
+static long cec_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ struct cec_fh *fh = filp->private_data;
+ struct cec_adapter *adap = fh->adap;
+ bool block = !(filp->f_flags & O_NONBLOCK);
+ void __user *parg = (void __user *)arg;
+
+ if (!cec_is_registered(adap))
+ return -ENODEV;
+
+ switch (cmd) {
+ case CEC_ADAP_G_CAPS:
+ return cec_adap_g_caps(adap, parg);
+
+ case CEC_ADAP_G_PHYS_ADDR:
+ return cec_adap_g_phys_addr(adap, parg);
+
+ case CEC_ADAP_S_PHYS_ADDR:
+ return cec_adap_s_phys_addr(adap, fh, block, parg);
+
+ case CEC_ADAP_G_LOG_ADDRS:
+ return cec_adap_g_log_addrs(adap, parg);
+
+ case CEC_ADAP_S_LOG_ADDRS:
+ return cec_adap_s_log_addrs(adap, fh, block, parg);
+
+ case CEC_ADAP_G_CONNECTOR_INFO:
+ return cec_adap_g_connector_info(adap, parg);
+
+ case CEC_TRANSMIT:
+ return cec_transmit(adap, fh, block, parg);
+
+ case CEC_RECEIVE:
+ return cec_receive(adap, fh, block, parg);
+
+ case CEC_DQEVENT:
+ return cec_dqevent(adap, fh, block, parg);
+
+ case CEC_G_MODE:
+ return cec_g_mode(adap, fh, parg);
+
+ case CEC_S_MODE:
+ return cec_s_mode(adap, fh, parg);
+
+ default:
+ return -ENOTTY;
+ }
+}
+
+static int cec_open(struct inode *inode, struct file *filp)
+{
+ struct cec_devnode *devnode =
+ container_of(inode->i_cdev, struct cec_devnode, cdev);
+ struct cec_adapter *adap = to_cec_adapter(devnode);
+ struct cec_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL);
+ /*
+ * Initial events that are automatically sent when the cec device is
+ * opened.
+ */
+ struct cec_event ev = {
+ .event = CEC_EVENT_STATE_CHANGE,
+ .flags = CEC_EVENT_FL_INITIAL_STATE,
+ };
+ unsigned int i;
+ int err;
+
+ if (!fh)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&fh->msgs);
+ INIT_LIST_HEAD(&fh->xfer_list);
+ for (i = 0; i < CEC_NUM_EVENTS; i++)
+ INIT_LIST_HEAD(&fh->events[i]);
+ mutex_init(&fh->lock);
+ init_waitqueue_head(&fh->wait);
+
+ fh->mode_initiator = CEC_MODE_INITIATOR;
+ fh->adap = adap;
+
+ err = cec_get_device(devnode);
+ if (err) {
+ kfree(fh);
+ return err;
+ }
+
+ mutex_lock(&devnode->lock);
+ if (list_empty(&devnode->fhs) &&
+ !adap->needs_hpd &&
+ adap->phys_addr == CEC_PHYS_ADDR_INVALID) {
+ err = adap->ops->adap_enable(adap, true);
+ if (err) {
+ mutex_unlock(&devnode->lock);
+ kfree(fh);
+ return err;
+ }
+ }
+ filp->private_data = fh;
+
+ /* Queue up initial state events */
+ ev.state_change.phys_addr = adap->phys_addr;
+ ev.state_change.log_addr_mask = adap->log_addrs.log_addr_mask;
+ ev.state_change.have_conn_info =
+ adap->conn_info.type != CEC_CONNECTOR_TYPE_NO_CONNECTOR;
+ cec_queue_event_fh(fh, &ev, 0);
+#ifdef CONFIG_CEC_PIN
+ if (adap->pin && adap->pin->ops->read_hpd) {
+ err = adap->pin->ops->read_hpd(adap);
+ if (err >= 0) {
+ ev.event = err ? CEC_EVENT_PIN_HPD_HIGH :
+ CEC_EVENT_PIN_HPD_LOW;
+ cec_queue_event_fh(fh, &ev, 0);
+ }
+ }
+ if (adap->pin && adap->pin->ops->read_5v) {
+ err = adap->pin->ops->read_5v(adap);
+ if (err >= 0) {
+ ev.event = err ? CEC_EVENT_PIN_5V_HIGH :
+ CEC_EVENT_PIN_5V_LOW;
+ cec_queue_event_fh(fh, &ev, 0);
+ }
+ }
+#endif
+
+ list_add(&fh->list, &devnode->fhs);
+ mutex_unlock(&devnode->lock);
+
+ return 0;
+}
+
+/* Override for the release function */
+static int cec_release(struct inode *inode, struct file *filp)
+{
+ struct cec_devnode *devnode = cec_devnode_data(filp);
+ struct cec_adapter *adap = to_cec_adapter(devnode);
+ struct cec_fh *fh = filp->private_data;
+ unsigned int i;
+
+ mutex_lock(&adap->lock);
+ if (adap->cec_initiator == fh)
+ adap->cec_initiator = NULL;
+ if (adap->cec_follower == fh) {
+ adap->cec_follower = NULL;
+ adap->passthrough = false;
+ }
+ if (fh->mode_follower == CEC_MODE_FOLLOWER)
+ adap->follower_cnt--;
+ if (fh->mode_follower == CEC_MODE_MONITOR_PIN)
+ cec_monitor_pin_cnt_dec(adap);
+ if (fh->mode_follower == CEC_MODE_MONITOR_ALL)
+ cec_monitor_all_cnt_dec(adap);
+ mutex_unlock(&adap->lock);
+
+ mutex_lock(&devnode->lock);
+ list_del(&fh->list);
+ if (cec_is_registered(adap) && list_empty(&devnode->fhs) &&
+ !adap->needs_hpd && adap->phys_addr == CEC_PHYS_ADDR_INVALID) {
+ WARN_ON(adap->ops->adap_enable(adap, false));
+ }
+ mutex_unlock(&devnode->lock);
+
+ /* Unhook pending transmits from this filehandle. */
+ mutex_lock(&adap->lock);
+ while (!list_empty(&fh->xfer_list)) {
+ struct cec_data *data =
+ list_first_entry(&fh->xfer_list, struct cec_data, xfer_list);
+
+ data->blocking = false;
+ data->fh = NULL;
+ list_del(&data->xfer_list);
+ }
+ mutex_unlock(&adap->lock);
+ while (!list_empty(&fh->msgs)) {
+ struct cec_msg_entry *entry =
+ list_first_entry(&fh->msgs, struct cec_msg_entry, list);
+
+ list_del(&entry->list);
+ kfree(entry);
+ }
+ for (i = CEC_NUM_CORE_EVENTS; i < CEC_NUM_EVENTS; i++) {
+ while (!list_empty(&fh->events[i])) {
+ struct cec_event_entry *entry =
+ list_first_entry(&fh->events[i],
+ struct cec_event_entry, list);
+
+ list_del(&entry->list);
+ kfree(entry);
+ }
+ }
+ kfree(fh);
+
+ cec_put_device(devnode);
+ filp->private_data = NULL;
+ return 0;
+}
+
+const struct file_operations cec_devnode_fops = {
+ .owner = THIS_MODULE,
+ .open = cec_open,
+ .unlocked_ioctl = cec_ioctl,
+ .compat_ioctl = cec_ioctl,
+ .release = cec_release,
+ .poll = cec_poll,
+ .llseek = no_llseek,
+};
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * cec-core.c - HDMI Consumer Electronics Control framework - Core
+ *
+ * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/kmod.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+#include "cec-priv.h"
+
+#define CEC_NUM_DEVICES 256
+#define CEC_NAME "cec"
+
+int cec_debug;
+module_param_named(debug, cec_debug, int, 0644);
+MODULE_PARM_DESC(debug, "debug level (0-2)");
+
+static bool debug_phys_addr;
+module_param(debug_phys_addr, bool, 0644);
+MODULE_PARM_DESC(debug_phys_addr, "add CEC_CAP_PHYS_ADDR if set");
+
+static dev_t cec_dev_t;
+
+/* Active devices */
+static DEFINE_MUTEX(cec_devnode_lock);
+static DECLARE_BITMAP(cec_devnode_nums, CEC_NUM_DEVICES);
+
+static struct dentry *top_cec_dir;
+
+/* dev to cec_devnode */
+#define to_cec_devnode(cd) container_of(cd, struct cec_devnode, dev)
+
+int cec_get_device(struct cec_devnode *devnode)
+{
+ /*
+ * Check if the cec device is available. This needs to be done with
+ * the devnode->lock held to prevent an open/unregister race:
+ * without the lock, the device could be unregistered and freed between
+ * the devnode->registered check and get_device() calls, leading to
+ * a crash.
+ */
+ mutex_lock(&devnode->lock);
+ /*
+ * return ENXIO if the cec device has been removed
+ * already or if it is not registered anymore.
+ */
+ if (!devnode->registered) {
+ mutex_unlock(&devnode->lock);
+ return -ENXIO;
+ }
+ /* and increase the device refcount */
+ get_device(&devnode->dev);
+ mutex_unlock(&devnode->lock);
+ return 0;
+}
+
+void cec_put_device(struct cec_devnode *devnode)
+{
+ put_device(&devnode->dev);
+}
+
+/* Called when the last user of the cec device exits. */
+static void cec_devnode_release(struct device *cd)
+{
+ struct cec_devnode *devnode = to_cec_devnode(cd);
+
+ mutex_lock(&cec_devnode_lock);
+ /* Mark device node number as free */
+ clear_bit(devnode->minor, cec_devnode_nums);
+ mutex_unlock(&cec_devnode_lock);
+
+ cec_delete_adapter(to_cec_adapter(devnode));
+}
+
+static struct bus_type cec_bus_type = {
+ .name = CEC_NAME,
+};
+
+/*
+ * Register a cec device node
+ *
+ * The registration code assigns minor numbers and registers the new device node
+ * with the kernel. An error is returned if no free minor number can be found,
+ * or if the registration of the device node fails.
+ *
+ * Zero is returned on success.
+ *
+ * Note that if the cec_devnode_register call fails, the release() callback of
+ * the cec_devnode structure is *not* called, so the caller is responsible for
+ * freeing any data.
+ */
+static int __must_check cec_devnode_register(struct cec_devnode *devnode,
+ struct module *owner)
+{
+ int minor;
+ int ret;
+
+ /* Part 1: Find a free minor number */
+ mutex_lock(&cec_devnode_lock);
+ minor = find_next_zero_bit(cec_devnode_nums, CEC_NUM_DEVICES, 0);
+ if (minor == CEC_NUM_DEVICES) {
+ mutex_unlock(&cec_devnode_lock);
+ pr_err("could not get a free minor\n");
+ return -ENFILE;
+ }
+
+ set_bit(minor, cec_devnode_nums);
+ mutex_unlock(&cec_devnode_lock);
+
+ devnode->minor = minor;
+ devnode->dev.bus = &cec_bus_type;
+ devnode->dev.devt = MKDEV(MAJOR(cec_dev_t), minor);
+ devnode->dev.release = cec_devnode_release;
+ dev_set_name(&devnode->dev, "cec%d", devnode->minor);
+ device_initialize(&devnode->dev);
+
+ /* Part 2: Initialize and register the character device */
+ cdev_init(&devnode->cdev, &cec_devnode_fops);
+ devnode->cdev.owner = owner;
+ kobject_set_name(&devnode->cdev.kobj, "cec%d", devnode->minor);
+
+ devnode->registered = true;
+ ret = cdev_device_add(&devnode->cdev, &devnode->dev);
+ if (ret) {
+ devnode->registered = false;
+ pr_err("%s: cdev_device_add failed\n", __func__);
+ goto clr_bit;
+ }
+
+ return 0;
+
+clr_bit:
+ mutex_lock(&cec_devnode_lock);
+ clear_bit(devnode->minor, cec_devnode_nums);
+ mutex_unlock(&cec_devnode_lock);
+ return ret;
+}
+
+/*
+ * Unregister a cec device node
+ *
+ * This unregisters the passed device. Future open calls will be met with
+ * errors.
+ *
+ * This function can safely be called if the device node has never been
+ * registered or has already been unregistered.
+ */
+static void cec_devnode_unregister(struct cec_adapter *adap)
+{
+ struct cec_devnode *devnode = &adap->devnode;
+ struct cec_fh *fh;
+
+ mutex_lock(&devnode->lock);
+
+ /* Check if devnode was never registered or already unregistered */
+ if (!devnode->registered || devnode->unregistered) {
+ mutex_unlock(&devnode->lock);
+ return;
+ }
+
+ list_for_each_entry(fh, &devnode->fhs, list)
+ wake_up_interruptible(&fh->wait);
+
+ devnode->registered = false;
+ devnode->unregistered = true;
+ mutex_unlock(&devnode->lock);
+
+ mutex_lock(&adap->lock);
+ __cec_s_phys_addr(adap, CEC_PHYS_ADDR_INVALID, false);
+ __cec_s_log_addrs(adap, NULL, false);
+ mutex_unlock(&adap->lock);
+
+ cdev_device_del(&devnode->cdev, &devnode->dev);
+ put_device(&devnode->dev);
+}
+
+#ifdef CONFIG_DEBUG_FS
+static ssize_t cec_error_inj_write(struct file *file,
+ const char __user *ubuf, size_t count, loff_t *ppos)
+{
+ struct seq_file *sf = file->private_data;
+ struct cec_adapter *adap = sf->private;
+ char *buf;
+ char *line;
+ char *p;
+
+ buf = memdup_user_nul(ubuf, min_t(size_t, PAGE_SIZE, count));
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+ p = buf;
+ while (p && *p) {
+ p = skip_spaces(p);
+ line = strsep(&p, "\n");
+ if (!*line || *line == '#')
+ continue;
+ if (!adap->ops->error_inj_parse_line(adap, line)) {
+ kfree(buf);
+ return -EINVAL;
+ }
+ }
+ kfree(buf);
+ return count;
+}
+
+static int cec_error_inj_show(struct seq_file *sf, void *unused)
+{
+ struct cec_adapter *adap = sf->private;
+
+ return adap->ops->error_inj_show(adap, sf);
+}
+
+static int cec_error_inj_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, cec_error_inj_show, inode->i_private);
+}
+
+static const struct file_operations cec_error_inj_fops = {
+ .open = cec_error_inj_open,
+ .write = cec_error_inj_write,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+#endif
+
+struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops,
+ void *priv, const char *name, u32 caps,
+ u8 available_las)
+{
+ struct cec_adapter *adap;
+ int res;
+
+#ifndef CONFIG_MEDIA_CEC_RC
+ caps &= ~CEC_CAP_RC;
+#endif
+
+ if (WARN_ON(!caps))
+ return ERR_PTR(-EINVAL);
+ if (WARN_ON(!ops))
+ return ERR_PTR(-EINVAL);
+ if (WARN_ON(!available_las || available_las > CEC_MAX_LOG_ADDRS))
+ return ERR_PTR(-EINVAL);
+ adap = kzalloc(sizeof(*adap), GFP_KERNEL);
+ if (!adap)
+ return ERR_PTR(-ENOMEM);
+ strscpy(adap->name, name, sizeof(adap->name));
+ adap->phys_addr = CEC_PHYS_ADDR_INVALID;
+ adap->cec_pin_is_high = true;
+ adap->log_addrs.cec_version = CEC_OP_CEC_VERSION_2_0;
+ adap->log_addrs.vendor_id = CEC_VENDOR_ID_NONE;
+ adap->capabilities = caps;
+ if (debug_phys_addr)
+ adap->capabilities |= CEC_CAP_PHYS_ADDR;
+ adap->needs_hpd = caps & CEC_CAP_NEEDS_HPD;
+ adap->available_log_addrs = available_las;
+ adap->sequence = 0;
+ adap->ops = ops;
+ adap->priv = priv;
+ memset(adap->phys_addrs, 0xff, sizeof(adap->phys_addrs));
+ mutex_init(&adap->lock);
+ INIT_LIST_HEAD(&adap->transmit_queue);
+ INIT_LIST_HEAD(&adap->wait_queue);
+ init_waitqueue_head(&adap->kthread_waitq);
+
+ /* adap->devnode initialization */
+ INIT_LIST_HEAD(&adap->devnode.fhs);
+ mutex_init(&adap->devnode.lock);
+
+ adap->kthread = kthread_run(cec_thread_func, adap, "cec-%s", name);
+ if (IS_ERR(adap->kthread)) {
+ pr_err("cec-%s: kernel_thread() failed\n", name);
+ res = PTR_ERR(adap->kthread);
+ kfree(adap);
+ return ERR_PTR(res);
+ }
+
+#ifdef CONFIG_MEDIA_CEC_RC
+ if (!(caps & CEC_CAP_RC))
+ return adap;
+
+ /* Prepare the RC input device */
+ adap->rc = rc_allocate_device(RC_DRIVER_SCANCODE);
+ if (!adap->rc) {
+ pr_err("cec-%s: failed to allocate memory for rc_dev\n",
+ name);
+ kthread_stop(adap->kthread);
+ kfree(adap);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ snprintf(adap->input_phys, sizeof(adap->input_phys),
+ "%s/input0", adap->name);
+
+ adap->rc->device_name = adap->name;
+ adap->rc->input_phys = adap->input_phys;
+ adap->rc->input_id.bustype = BUS_CEC;
+ adap->rc->input_id.vendor = 0;
+ adap->rc->input_id.product = 0;
+ adap->rc->input_id.version = 1;
+ adap->rc->driver_name = CEC_NAME;
+ adap->rc->allowed_protocols = RC_PROTO_BIT_CEC;
+ adap->rc->priv = adap;
+ adap->rc->map_name = RC_MAP_CEC;
+ adap->rc->timeout = MS_TO_NS(550);
+#endif
+ return adap;
+}
+EXPORT_SYMBOL_GPL(cec_allocate_adapter);
+
+int cec_register_adapter(struct cec_adapter *adap,
+ struct device *parent)
+{
+ int res;
+
+ if (IS_ERR_OR_NULL(adap))
+ return 0;
+
+ if (WARN_ON(!parent))
+ return -EINVAL;
+
+ adap->owner = parent->driver->owner;
+ adap->devnode.dev.parent = parent;
+
+#ifdef CONFIG_MEDIA_CEC_RC
+ if (adap->capabilities & CEC_CAP_RC) {
+ adap->rc->dev.parent = parent;
+ res = rc_register_device(adap->rc);
+
+ if (res) {
+ pr_err("cec-%s: failed to prepare input device\n",
+ adap->name);
+ rc_free_device(adap->rc);
+ adap->rc = NULL;
+ return res;
+ }
+ }
+#endif
+
+ res = cec_devnode_register(&adap->devnode, adap->owner);
+ if (res) {
+#ifdef CONFIG_MEDIA_CEC_RC
+ /* Note: rc_unregister also calls rc_free */
+ rc_unregister_device(adap->rc);
+ adap->rc = NULL;
+#endif
+ return res;
+ }
+
+ dev_set_drvdata(&adap->devnode.dev, adap);
+#ifdef CONFIG_DEBUG_FS
+ if (!top_cec_dir)
+ return 0;
+
+ adap->cec_dir = debugfs_create_dir(dev_name(&adap->devnode.dev), top_cec_dir);
+ if (IS_ERR_OR_NULL(adap->cec_dir)) {
+ pr_warn("cec-%s: Failed to create debugfs dir\n", adap->name);
+ return 0;
+ }
+ adap->status_file = debugfs_create_devm_seqfile(&adap->devnode.dev,
+ "status", adap->cec_dir, cec_adap_status);
+ if (IS_ERR_OR_NULL(adap->status_file)) {
+ pr_warn("cec-%s: Failed to create status file\n", adap->name);
+ debugfs_remove_recursive(adap->cec_dir);
+ adap->cec_dir = NULL;
+ return 0;
+ }
+ if (!adap->ops->error_inj_show || !adap->ops->error_inj_parse_line)
+ return 0;
+ adap->error_inj_file = debugfs_create_file("error-inj", 0644,
+ adap->cec_dir, adap,
+ &cec_error_inj_fops);
+ if (IS_ERR_OR_NULL(adap->error_inj_file))
+ pr_warn("cec-%s: Failed to create error-inj file\n",
+ adap->name);
+#endif
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cec_register_adapter);
+
+void cec_unregister_adapter(struct cec_adapter *adap)
+{
+ if (IS_ERR_OR_NULL(adap))
+ return;
+
+#ifdef CONFIG_MEDIA_CEC_RC
+ /* Note: rc_unregister also calls rc_free */
+ rc_unregister_device(adap->rc);
+ adap->rc = NULL;
+#endif
+ debugfs_remove_recursive(adap->cec_dir);
+#ifdef CONFIG_CEC_NOTIFIER
+ cec_notifier_cec_adap_unregister(adap->notifier, adap);
+#endif
+ cec_devnode_unregister(adap);
+}
+EXPORT_SYMBOL_GPL(cec_unregister_adapter);
+
+void cec_delete_adapter(struct cec_adapter *adap)
+{
+ if (IS_ERR_OR_NULL(adap))
+ return;
+ kthread_stop(adap->kthread);
+ if (adap->kthread_config)
+ kthread_stop(adap->kthread_config);
+ if (adap->ops->adap_free)
+ adap->ops->adap_free(adap);
+#ifdef CONFIG_MEDIA_CEC_RC
+ rc_free_device(adap->rc);
+#endif
+ kfree(adap);
+}
+EXPORT_SYMBOL_GPL(cec_delete_adapter);
+
+/*
+ * Initialise cec for linux
+ */
+static int __init cec_devnode_init(void)
+{
+ int ret = alloc_chrdev_region(&cec_dev_t, 0, CEC_NUM_DEVICES, CEC_NAME);
+
+ if (ret < 0) {
+ pr_warn("cec: unable to allocate major\n");
+ return ret;
+ }
+
+#ifdef CONFIG_DEBUG_FS
+ top_cec_dir = debugfs_create_dir("cec", NULL);
+ if (IS_ERR_OR_NULL(top_cec_dir)) {
+ pr_warn("cec: Failed to create debugfs cec dir\n");
+ top_cec_dir = NULL;
+ }
+#endif
+
+ ret = bus_register(&cec_bus_type);
+ if (ret < 0) {
+ unregister_chrdev_region(cec_dev_t, CEC_NUM_DEVICES);
+ pr_warn("cec: bus_register failed\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static void __exit cec_devnode_exit(void)
+{
+ debugfs_remove_recursive(top_cec_dir);
+ bus_unregister(&cec_bus_type);
+ unregister_chrdev_region(cec_dev_t, CEC_NUM_DEVICES);
+}
+
+subsys_initcall(cec_devnode_init);
+module_exit(cec_devnode_exit)
+
+MODULE_AUTHOR("Hans Verkuil <hans.verkuil@cisco.com>");
+MODULE_DESCRIPTION("Device node registration for cec drivers");
+MODULE_LICENSE("GPL");
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * cec-notifier.c - notify CEC drivers of physical address changes
+ *
+ * Copyright 2016 Russell King <rmk+kernel@arm.linux.org.uk>
+ * Copyright 2016-2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#include <linux/export.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/kref.h>
+#include <linux/of_platform.h>
+
+#include <media/cec.h>
+#include <media/cec-notifier.h>
+#include <drm/drm_edid.h>
+
+struct cec_notifier {
+ struct mutex lock;
+ struct list_head head;
+ struct kref kref;
+ struct device *hdmi_dev;
+ struct cec_connector_info conn_info;
+ const char *port_name;
+ struct cec_adapter *cec_adap;
+
+ u16 phys_addr;
+};
+
+static LIST_HEAD(cec_notifiers);
+static DEFINE_MUTEX(cec_notifiers_lock);
+
+/**
+ * cec_notifier_get_conn - find or create a new cec_notifier for the given
+ * device and connector tuple.
+ * @hdmi_dev: device that sends the events.
+ * @port_name: the connector name from which the event occurs
+ *
+ * If a notifier for device @dev already exists, then increase the refcount
+ * and return that notifier.
+ *
+ * If it doesn't exist, then allocate a new notifier struct and return a
+ * pointer to that new struct.
+ *
+ * Return NULL if the memory could not be allocated.
+ */
+static struct cec_notifier *
+cec_notifier_get_conn(struct device *hdmi_dev, const char *port_name)
+{
+ struct cec_notifier *n;
+
+ mutex_lock(&cec_notifiers_lock);
+ list_for_each_entry(n, &cec_notifiers, head) {
+ if (n->hdmi_dev == hdmi_dev &&
+ (!port_name ||
+ (n->port_name && !strcmp(n->port_name, port_name)))) {
+ kref_get(&n->kref);
+ mutex_unlock(&cec_notifiers_lock);
+ return n;
+ }
+ }
+ n = kzalloc(sizeof(*n), GFP_KERNEL);
+ if (!n)
+ goto unlock;
+ n->hdmi_dev = hdmi_dev;
+ if (port_name) {
+ n->port_name = kstrdup(port_name, GFP_KERNEL);
+ if (!n->port_name) {
+ kfree(n);
+ n = NULL;
+ goto unlock;
+ }
+ }
+ n->phys_addr = CEC_PHYS_ADDR_INVALID;
+
+ mutex_init(&n->lock);
+ kref_init(&n->kref);
+ list_add_tail(&n->head, &cec_notifiers);
+unlock:
+ mutex_unlock(&cec_notifiers_lock);
+ return n;
+}
+
+static void cec_notifier_release(struct kref *kref)
+{
+ struct cec_notifier *n =
+ container_of(kref, struct cec_notifier, kref);
+
+ list_del(&n->head);
+ kfree(n->port_name);
+ kfree(n);
+}
+
+static void cec_notifier_put(struct cec_notifier *n)
+{
+ mutex_lock(&cec_notifiers_lock);
+ kref_put(&n->kref, cec_notifier_release);
+ mutex_unlock(&cec_notifiers_lock);
+}
+
+struct cec_notifier *
+cec_notifier_conn_register(struct device *hdmi_dev, const char *port_name,
+ const struct cec_connector_info *conn_info)
+{
+ struct cec_notifier *n = cec_notifier_get_conn(hdmi_dev, port_name);
+
+ if (!n)
+ return n;
+
+ mutex_lock(&n->lock);
+ n->phys_addr = CEC_PHYS_ADDR_INVALID;
+ if (conn_info)
+ n->conn_info = *conn_info;
+ else
+ memset(&n->conn_info, 0, sizeof(n->conn_info));
+ if (n->cec_adap) {
+ cec_phys_addr_invalidate(n->cec_adap);
+ cec_s_conn_info(n->cec_adap, conn_info);
+ }
+ mutex_unlock(&n->lock);
+ return n;
+}
+EXPORT_SYMBOL_GPL(cec_notifier_conn_register);
+
+void cec_notifier_conn_unregister(struct cec_notifier *n)
+{
+ if (!n)
+ return;
+
+ mutex_lock(&n->lock);
+ memset(&n->conn_info, 0, sizeof(n->conn_info));
+ n->phys_addr = CEC_PHYS_ADDR_INVALID;
+ if (n->cec_adap) {
+ cec_phys_addr_invalidate(n->cec_adap);
+ cec_s_conn_info(n->cec_adap, NULL);
+ }
+ mutex_unlock(&n->lock);
+ cec_notifier_put(n);
+}
+EXPORT_SYMBOL_GPL(cec_notifier_conn_unregister);
+
+struct cec_notifier *
+cec_notifier_cec_adap_register(struct device *hdmi_dev, const char *port_name,
+ struct cec_adapter *adap)
+{
+ struct cec_notifier *n;
+
+ if (WARN_ON(!adap))
+ return NULL;
+
+ n = cec_notifier_get_conn(hdmi_dev, port_name);
+ if (!n)
+ return n;
+
+ mutex_lock(&n->lock);
+ n->cec_adap = adap;
+ adap->conn_info = n->conn_info;
+ adap->notifier = n;
+ cec_s_phys_addr(adap, n->phys_addr, false);
+ mutex_unlock(&n->lock);
+ return n;
+}
+EXPORT_SYMBOL_GPL(cec_notifier_cec_adap_register);
+
+void cec_notifier_cec_adap_unregister(struct cec_notifier *n,
+ struct cec_adapter *adap)
+{
+ if (!n)
+ return;
+
+ mutex_lock(&n->lock);
+ adap->notifier = NULL;
+ n->cec_adap = NULL;
+ mutex_unlock(&n->lock);
+ cec_notifier_put(n);
+}
+EXPORT_SYMBOL_GPL(cec_notifier_cec_adap_unregister);
+
+void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa)
+{
+ if (n == NULL)
+ return;
+
+ mutex_lock(&n->lock);
+ n->phys_addr = pa;
+ if (n->cec_adap)
+ cec_s_phys_addr(n->cec_adap, n->phys_addr, false);
+ mutex_unlock(&n->lock);
+}
+EXPORT_SYMBOL_GPL(cec_notifier_set_phys_addr);
+
+void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n,
+ const struct edid *edid)
+{
+ u16 pa = CEC_PHYS_ADDR_INVALID;
+
+ if (n == NULL)
+ return;
+
+ if (edid && edid->extensions)
+ pa = cec_get_edid_phys_addr((const u8 *)edid,
+ EDID_LENGTH * (edid->extensions + 1), NULL);
+ cec_notifier_set_phys_addr(n, pa);
+}
+EXPORT_SYMBOL_GPL(cec_notifier_set_phys_addr_from_edid);
+
+struct device *cec_notifier_parse_hdmi_phandle(struct device *dev)
+{
+ struct platform_device *hdmi_pdev;
+ struct device *hdmi_dev = NULL;
+ struct device_node *np;
+
+ np = of_parse_phandle(dev->of_node, "hdmi-phandle", 0);
+
+ if (!np) {
+ dev_err(dev, "Failed to find HDMI node in device tree\n");
+ return ERR_PTR(-ENODEV);
+ }
+ hdmi_pdev = of_find_device_by_node(np);
+ of_node_put(np);
+ if (hdmi_pdev) {
+ hdmi_dev = &hdmi_pdev->dev;
+ /*
+ * Note that the device struct is only used as a key into the
+ * cec_notifiers list, it is never actually accessed.
+ * So we decrement the reference here so we don't leak
+ * memory.
+ */
+ put_device(hdmi_dev);
+ return hdmi_dev;
+ }
+ return ERR_PTR(-EPROBE_DEFER);
+}
+EXPORT_SYMBOL_GPL(cec_notifier_parse_hdmi_phandle);
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/sched/types.h>
+
+#include <media/cec-pin.h>
+#include "cec-pin-priv.h"
+
+struct cec_error_inj_cmd {
+ unsigned int mode_offset;
+ int arg_idx;
+ const char *cmd;
+};
+
+static const struct cec_error_inj_cmd cec_error_inj_cmds[] = {
+ { CEC_ERROR_INJ_RX_NACK_OFFSET, -1, "rx-nack" },
+ { CEC_ERROR_INJ_RX_LOW_DRIVE_OFFSET,
+ CEC_ERROR_INJ_RX_LOW_DRIVE_ARG_IDX, "rx-low-drive" },
+ { CEC_ERROR_INJ_RX_ADD_BYTE_OFFSET, -1, "rx-add-byte" },
+ { CEC_ERROR_INJ_RX_REMOVE_BYTE_OFFSET, -1, "rx-remove-byte" },
+ { CEC_ERROR_INJ_RX_ARB_LOST_OFFSET,
+ CEC_ERROR_INJ_RX_ARB_LOST_ARG_IDX, "rx-arb-lost" },
+
+ { CEC_ERROR_INJ_TX_NO_EOM_OFFSET, -1, "tx-no-eom" },
+ { CEC_ERROR_INJ_TX_EARLY_EOM_OFFSET, -1, "tx-early-eom" },
+ { CEC_ERROR_INJ_TX_ADD_BYTES_OFFSET,
+ CEC_ERROR_INJ_TX_ADD_BYTES_ARG_IDX, "tx-add-bytes" },
+ { CEC_ERROR_INJ_TX_REMOVE_BYTE_OFFSET, -1, "tx-remove-byte" },
+ { CEC_ERROR_INJ_TX_SHORT_BIT_OFFSET,
+ CEC_ERROR_INJ_TX_SHORT_BIT_ARG_IDX, "tx-short-bit" },
+ { CEC_ERROR_INJ_TX_LONG_BIT_OFFSET,
+ CEC_ERROR_INJ_TX_LONG_BIT_ARG_IDX, "tx-long-bit" },
+ { CEC_ERROR_INJ_TX_CUSTOM_BIT_OFFSET,
+ CEC_ERROR_INJ_TX_CUSTOM_BIT_ARG_IDX, "tx-custom-bit" },
+ { CEC_ERROR_INJ_TX_SHORT_START_OFFSET, -1, "tx-short-start" },
+ { CEC_ERROR_INJ_TX_LONG_START_OFFSET, -1, "tx-long-start" },
+ { CEC_ERROR_INJ_TX_CUSTOM_START_OFFSET, -1, "tx-custom-start" },
+ { CEC_ERROR_INJ_TX_LAST_BIT_OFFSET,
+ CEC_ERROR_INJ_TX_LAST_BIT_ARG_IDX, "tx-last-bit" },
+ { CEC_ERROR_INJ_TX_LOW_DRIVE_OFFSET,
+ CEC_ERROR_INJ_TX_LOW_DRIVE_ARG_IDX, "tx-low-drive" },
+ { 0, -1, NULL }
+};
+
+u16 cec_pin_rx_error_inj(struct cec_pin *pin)
+{
+ u16 cmd = CEC_ERROR_INJ_OP_ANY;
+
+ /* Only when 18 bits have been received do we have a valid cmd */
+ if (!(pin->error_inj[cmd] & CEC_ERROR_INJ_RX_MASK) &&
+ pin->rx_bit >= 18)
+ cmd = pin->rx_msg.msg[1];
+ return (pin->error_inj[cmd] & CEC_ERROR_INJ_RX_MASK) ? cmd :
+ CEC_ERROR_INJ_OP_ANY;
+}
+
+u16 cec_pin_tx_error_inj(struct cec_pin *pin)
+{
+ u16 cmd = CEC_ERROR_INJ_OP_ANY;
+
+ if (!(pin->error_inj[cmd] & CEC_ERROR_INJ_TX_MASK) &&
+ pin->tx_msg.len > 1)
+ cmd = pin->tx_msg.msg[1];
+ return (pin->error_inj[cmd] & CEC_ERROR_INJ_TX_MASK) ? cmd :
+ CEC_ERROR_INJ_OP_ANY;
+}
+
+bool cec_pin_error_inj_parse_line(struct cec_adapter *adap, char *line)
+{
+ static const char *delims = " \t\r";
+ struct cec_pin *pin = adap->pin;
+ unsigned int i;
+ bool has_pos = false;
+ char *p = line;
+ char *token;
+ char *comma;
+ u64 *error;
+ u8 *args;
+ bool has_op;
+ u8 op;
+ u8 mode;
+ u8 pos;
+
+ p = skip_spaces(p);
+ token = strsep(&p, delims);
+ if (!strcmp(token, "clear")) {
+ memset(pin->error_inj, 0, sizeof(pin->error_inj));
+ pin->rx_toggle = pin->tx_toggle = false;
+ pin->tx_ignore_nack_until_eom = false;
+ pin->tx_custom_pulse = false;
+ pin->tx_custom_low_usecs = CEC_TIM_CUSTOM_DEFAULT;
+ pin->tx_custom_high_usecs = CEC_TIM_CUSTOM_DEFAULT;
+ return true;
+ }
+ if (!strcmp(token, "rx-clear")) {
+ for (i = 0; i <= CEC_ERROR_INJ_OP_ANY; i++)
+ pin->error_inj[i] &= ~CEC_ERROR_INJ_RX_MASK;
+ pin->rx_toggle = false;
+ return true;
+ }
+ if (!strcmp(token, "tx-clear")) {
+ for (i = 0; i <= CEC_ERROR_INJ_OP_ANY; i++)
+ pin->error_inj[i] &= ~CEC_ERROR_INJ_TX_MASK;
+ pin->tx_toggle = false;
+ pin->tx_ignore_nack_until_eom = false;
+ pin->tx_custom_pulse = false;
+ pin->tx_custom_low_usecs = CEC_TIM_CUSTOM_DEFAULT;
+ pin->tx_custom_high_usecs = CEC_TIM_CUSTOM_DEFAULT;
+ return true;
+ }
+ if (!strcmp(token, "tx-ignore-nack-until-eom")) {
+ pin->tx_ignore_nack_until_eom = true;
+ return true;
+ }
+ if (!strcmp(token, "tx-custom-pulse")) {
+ pin->tx_custom_pulse = true;
+ cec_pin_start_timer(pin);
+ return true;
+ }
+ if (!p)
+ return false;
+
+ p = skip_spaces(p);
+ if (!strcmp(token, "tx-custom-low-usecs")) {
+ u32 usecs;
+
+ if (kstrtou32(p, 0, &usecs) || usecs > 10000000)
+ return false;
+ pin->tx_custom_low_usecs = usecs;
+ return true;
+ }
+ if (!strcmp(token, "tx-custom-high-usecs")) {
+ u32 usecs;
+
+ if (kstrtou32(p, 0, &usecs) || usecs > 10000000)
+ return false;
+ pin->tx_custom_high_usecs = usecs;
+ return true;
+ }
+
+ comma = strchr(token, ',');
+ if (comma)
+ *comma++ = '\0';
+ if (!strcmp(token, "any")) {
+ has_op = false;
+ error = pin->error_inj + CEC_ERROR_INJ_OP_ANY;
+ args = pin->error_inj_args[CEC_ERROR_INJ_OP_ANY];
+ } else if (!kstrtou8(token, 0, &op)) {
+ has_op = true;
+ error = pin->error_inj + op;
+ args = pin->error_inj_args[op];
+ } else {
+ return false;
+ }
+
+ mode = CEC_ERROR_INJ_MODE_ONCE;
+ if (comma) {
+ if (!strcmp(comma, "off"))
+ mode = CEC_ERROR_INJ_MODE_OFF;
+ else if (!strcmp(comma, "once"))
+ mode = CEC_ERROR_INJ_MODE_ONCE;
+ else if (!strcmp(comma, "always"))
+ mode = CEC_ERROR_INJ_MODE_ALWAYS;
+ else if (!strcmp(comma, "toggle"))
+ mode = CEC_ERROR_INJ_MODE_TOGGLE;
+ else
+ return false;
+ }
+
+ token = strsep(&p, delims);
+ if (p) {
+ p = skip_spaces(p);
+ has_pos = !kstrtou8(p, 0, &pos);
+ }
+
+ if (!strcmp(token, "clear")) {
+ *error = 0;
+ return true;
+ }
+ if (!strcmp(token, "rx-clear")) {
+ *error &= ~CEC_ERROR_INJ_RX_MASK;
+ return true;
+ }
+ if (!strcmp(token, "tx-clear")) {
+ *error &= ~CEC_ERROR_INJ_TX_MASK;
+ return true;
+ }
+
+ for (i = 0; cec_error_inj_cmds[i].cmd; i++) {
+ const char *cmd = cec_error_inj_cmds[i].cmd;
+ unsigned int mode_offset;
+ u64 mode_mask;
+ int arg_idx;
+ bool is_bit_pos = true;
+
+ if (strcmp(token, cmd))
+ continue;
+
+ mode_offset = cec_error_inj_cmds[i].mode_offset;
+ mode_mask = CEC_ERROR_INJ_MODE_MASK << mode_offset;
+ arg_idx = cec_error_inj_cmds[i].arg_idx;
+
+ if (mode_offset == CEC_ERROR_INJ_RX_ARB_LOST_OFFSET) {
+ if (has_op)
+ return false;
+ if (!has_pos)
+ pos = 0x0f;
+ is_bit_pos = false;
+ } else if (mode_offset == CEC_ERROR_INJ_TX_ADD_BYTES_OFFSET) {
+ if (!has_pos || !pos)
+ return false;
+ is_bit_pos = false;
+ }
+
+ if (arg_idx >= 0 && is_bit_pos) {
+ if (!has_pos || pos >= 160)
+ return false;
+ if (has_op && pos < 10 + 8)
+ return false;
+ /* Invalid bit position may not be the Ack bit */
+ if ((mode_offset == CEC_ERROR_INJ_TX_SHORT_BIT_OFFSET ||
+ mode_offset == CEC_ERROR_INJ_TX_LONG_BIT_OFFSET ||
+ mode_offset == CEC_ERROR_INJ_TX_CUSTOM_BIT_OFFSET) &&
+ (pos % 10) == 9)
+ return false;
+ }
+ *error &= ~mode_mask;
+ *error |= (u64)mode << mode_offset;
+ if (arg_idx >= 0)
+ args[arg_idx] = pos;
+ return true;
+ }
+ return false;
+}
+
+static void cec_pin_show_cmd(struct seq_file *sf, u32 cmd, u8 mode)
+{
+ if (cmd == CEC_ERROR_INJ_OP_ANY)
+ seq_puts(sf, "any,");
+ else
+ seq_printf(sf, "0x%02x,", cmd);
+ switch (mode) {
+ case CEC_ERROR_INJ_MODE_ONCE:
+ seq_puts(sf, "once ");
+ break;
+ case CEC_ERROR_INJ_MODE_ALWAYS:
+ seq_puts(sf, "always ");
+ break;
+ case CEC_ERROR_INJ_MODE_TOGGLE:
+ seq_puts(sf, "toggle ");
+ break;
+ default:
+ seq_puts(sf, "off ");
+ break;
+ }
+}
+
+int cec_pin_error_inj_show(struct cec_adapter *adap, struct seq_file *sf)
+{
+ struct cec_pin *pin = adap->pin;
+ unsigned int i, j;
+
+ seq_puts(sf, "# Clear error injections:\n");
+ seq_puts(sf, "# clear clear all rx and tx error injections\n");
+ seq_puts(sf, "# rx-clear clear all rx error injections\n");
+ seq_puts(sf, "# tx-clear clear all tx error injections\n");
+ seq_puts(sf, "# <op> clear clear all rx and tx error injections for <op>\n");
+ seq_puts(sf, "# <op> rx-clear clear all rx error injections for <op>\n");
+ seq_puts(sf, "# <op> tx-clear clear all tx error injections for <op>\n");
+ seq_puts(sf, "#\n");
+ seq_puts(sf, "# RX error injection:\n");
+ seq_puts(sf, "# <op>[,<mode>] rx-nack NACK the message instead of sending an ACK\n");
+ seq_puts(sf, "# <op>[,<mode>] rx-low-drive <bit> force a low-drive condition at this bit position\n");
+ seq_puts(sf, "# <op>[,<mode>] rx-add-byte add a spurious byte to the received CEC message\n");
+ seq_puts(sf, "# <op>[,<mode>] rx-remove-byte remove the last byte from the received CEC message\n");
+ seq_puts(sf, "# <op>[,<mode>] rx-arb-lost <poll> generate a POLL message to trigger an arbitration lost\n");
+ seq_puts(sf, "#\n");
+ seq_puts(sf, "# TX error injection settings:\n");
+ seq_puts(sf, "# tx-ignore-nack-until-eom ignore early NACKs until EOM\n");
+ seq_puts(sf, "# tx-custom-low-usecs <usecs> define the 'low' time for the custom pulse\n");
+ seq_puts(sf, "# tx-custom-high-usecs <usecs> define the 'high' time for the custom pulse\n");
+ seq_puts(sf, "# tx-custom-pulse transmit the custom pulse once the bus is idle\n");
+ seq_puts(sf, "#\n");
+ seq_puts(sf, "# TX error injection:\n");
+ seq_puts(sf, "# <op>[,<mode>] tx-no-eom don't set the EOM bit\n");
+ seq_puts(sf, "# <op>[,<mode>] tx-early-eom set the EOM bit one byte too soon\n");
+ seq_puts(sf, "# <op>[,<mode>] tx-add-bytes <num> append <num> (1-255) spurious bytes to the message\n");
+ seq_puts(sf, "# <op>[,<mode>] tx-remove-byte drop the last byte from the message\n");
+ seq_puts(sf, "# <op>[,<mode>] tx-short-bit <bit> make this bit shorter than allowed\n");
+ seq_puts(sf, "# <op>[,<mode>] tx-long-bit <bit> make this bit longer than allowed\n");
+ seq_puts(sf, "# <op>[,<mode>] tx-custom-bit <bit> send the custom pulse instead of this bit\n");
+ seq_puts(sf, "# <op>[,<mode>] tx-short-start send a start pulse that's too short\n");
+ seq_puts(sf, "# <op>[,<mode>] tx-long-start send a start pulse that's too long\n");
+ seq_puts(sf, "# <op>[,<mode>] tx-custom-start send the custom pulse instead of the start pulse\n");
+ seq_puts(sf, "# <op>[,<mode>] tx-last-bit <bit> stop sending after this bit\n");
+ seq_puts(sf, "# <op>[,<mode>] tx-low-drive <bit> force a low-drive condition at this bit position\n");
+ seq_puts(sf, "#\n");
+ seq_puts(sf, "# <op> CEC message opcode (0-255) or 'any'\n");
+ seq_puts(sf, "# <mode> 'once' (default), 'always', 'toggle' or 'off'\n");
+ seq_puts(sf, "# <bit> CEC message bit (0-159)\n");
+ seq_puts(sf, "# 10 bits per 'byte': bits 0-7: data, bit 8: EOM, bit 9: ACK\n");
+ seq_puts(sf, "# <poll> CEC poll message used to test arbitration lost (0x00-0xff, default 0x0f)\n");
+ seq_puts(sf, "# <usecs> microseconds (0-10000000, default 1000)\n");
+
+ seq_puts(sf, "\nclear\n");
+
+ for (i = 0; i < ARRAY_SIZE(pin->error_inj); i++) {
+ u64 e = pin->error_inj[i];
+
+ for (j = 0; cec_error_inj_cmds[j].cmd; j++) {
+ const char *cmd = cec_error_inj_cmds[j].cmd;
+ unsigned int mode;
+ unsigned int mode_offset;
+ int arg_idx;
+
+ mode_offset = cec_error_inj_cmds[j].mode_offset;
+ arg_idx = cec_error_inj_cmds[j].arg_idx;
+ mode = (e >> mode_offset) & CEC_ERROR_INJ_MODE_MASK;
+ if (!mode)
+ continue;
+ cec_pin_show_cmd(sf, i, mode);
+ seq_puts(sf, cmd);
+ if (arg_idx >= 0)
+ seq_printf(sf, " %u",
+ pin->error_inj_args[i][arg_idx]);
+ seq_puts(sf, "\n");
+ }
+ }
+
+ if (pin->tx_ignore_nack_until_eom)
+ seq_puts(sf, "tx-ignore-nack-until-eom\n");
+ if (pin->tx_custom_pulse)
+ seq_puts(sf, "tx-custom-pulse\n");
+ if (pin->tx_custom_low_usecs != CEC_TIM_CUSTOM_DEFAULT)
+ seq_printf(sf, "tx-custom-low-usecs %u\n",
+ pin->tx_custom_low_usecs);
+ if (pin->tx_custom_high_usecs != CEC_TIM_CUSTOM_DEFAULT)
+ seq_printf(sf, "tx-custom-high-usecs %u\n",
+ pin->tx_custom_high_usecs);
+ return 0;
+}
--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * cec-pin-priv.h - internal cec-pin header
+ *
+ * Copyright 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#ifndef LINUX_CEC_PIN_PRIV_H
+#define LINUX_CEC_PIN_PRIV_H
+
+#include <linux/types.h>
+#include <linux/atomic.h>
+#include <media/cec-pin.h>
+
+enum cec_pin_state {
+ /* CEC is off */
+ CEC_ST_OFF,
+ /* CEC is idle, waiting for Rx or Tx */
+ CEC_ST_IDLE,
+
+ /* Tx states */
+
+ /* Pending Tx, waiting for Signal Free Time to expire */
+ CEC_ST_TX_WAIT,
+ /* Low-drive was detected, wait for bus to go high */
+ CEC_ST_TX_WAIT_FOR_HIGH,
+ /* Drive CEC low for the start bit */
+ CEC_ST_TX_START_BIT_LOW,
+ /* Drive CEC high for the start bit */
+ CEC_ST_TX_START_BIT_HIGH,
+ /* Generate a start bit period that is too short */
+ CEC_ST_TX_START_BIT_HIGH_SHORT,
+ /* Generate a start bit period that is too long */
+ CEC_ST_TX_START_BIT_HIGH_LONG,
+ /* Drive CEC low for the start bit using the custom timing */
+ CEC_ST_TX_START_BIT_LOW_CUSTOM,
+ /* Drive CEC high for the start bit using the custom timing */
+ CEC_ST_TX_START_BIT_HIGH_CUSTOM,
+ /* Drive CEC low for the 0 bit */
+ CEC_ST_TX_DATA_BIT_0_LOW,
+ /* Drive CEC high for the 0 bit */
+ CEC_ST_TX_DATA_BIT_0_HIGH,
+ /* Generate a bit period that is too short */
+ CEC_ST_TX_DATA_BIT_0_HIGH_SHORT,
+ /* Generate a bit period that is too long */
+ CEC_ST_TX_DATA_BIT_0_HIGH_LONG,
+ /* Drive CEC low for the 1 bit */
+ CEC_ST_TX_DATA_BIT_1_LOW,
+ /* Drive CEC high for the 1 bit */
+ CEC_ST_TX_DATA_BIT_1_HIGH,
+ /* Generate a bit period that is too short */
+ CEC_ST_TX_DATA_BIT_1_HIGH_SHORT,
+ /* Generate a bit period that is too long */
+ CEC_ST_TX_DATA_BIT_1_HIGH_LONG,
+ /*
+ * Wait for start of sample time to check for Ack bit or first
+ * four initiator bits to check for Arbitration Lost.
+ */
+ CEC_ST_TX_DATA_BIT_1_HIGH_PRE_SAMPLE,
+ /* Wait for end of bit period after sampling */
+ CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE,
+ /* Generate a bit period that is too short */
+ CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_SHORT,
+ /* Generate a bit period that is too long */
+ CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_LONG,
+ /* Drive CEC low for a data bit using the custom timing */
+ CEC_ST_TX_DATA_BIT_LOW_CUSTOM,
+ /* Drive CEC high for a data bit using the custom timing */
+ CEC_ST_TX_DATA_BIT_HIGH_CUSTOM,
+ /* Drive CEC low for a standalone pulse using the custom timing */
+ CEC_ST_TX_PULSE_LOW_CUSTOM,
+ /* Drive CEC high for a standalone pulse using the custom timing */
+ CEC_ST_TX_PULSE_HIGH_CUSTOM,
+ /* Start low drive */
+ CEC_ST_TX_LOW_DRIVE,
+
+ /* Rx states */
+
+ /* Start bit low detected */
+ CEC_ST_RX_START_BIT_LOW,
+ /* Start bit high detected */
+ CEC_ST_RX_START_BIT_HIGH,
+ /* Wait for bit sample time */
+ CEC_ST_RX_DATA_SAMPLE,
+ /* Wait for earliest end of bit period after sampling */
+ CEC_ST_RX_DATA_POST_SAMPLE,
+ /* Wait for CEC to go low (i.e. end of bit period) */
+ CEC_ST_RX_DATA_WAIT_FOR_LOW,
+ /* Drive CEC low to send 0 Ack bit */
+ CEC_ST_RX_ACK_LOW,
+ /* End of 0 Ack time, wait for earliest end of bit period */
+ CEC_ST_RX_ACK_LOW_POST,
+ /* Wait for CEC to go high (i.e. end of bit period */
+ CEC_ST_RX_ACK_HIGH_POST,
+ /* Wait for earliest end of bit period and end of message */
+ CEC_ST_RX_ACK_FINISH,
+ /* Start low drive */
+ CEC_ST_RX_LOW_DRIVE,
+
+ /* Monitor pin using interrupts */
+ CEC_ST_RX_IRQ,
+
+ /* Total number of pin states */
+ CEC_PIN_STATES
+};
+
+/* Error Injection */
+
+/* Error injection modes */
+#define CEC_ERROR_INJ_MODE_OFF 0
+#define CEC_ERROR_INJ_MODE_ONCE 1
+#define CEC_ERROR_INJ_MODE_ALWAYS 2
+#define CEC_ERROR_INJ_MODE_TOGGLE 3
+#define CEC_ERROR_INJ_MODE_MASK 3ULL
+
+/* Receive error injection options */
+#define CEC_ERROR_INJ_RX_NACK_OFFSET 0
+#define CEC_ERROR_INJ_RX_LOW_DRIVE_OFFSET 2
+#define CEC_ERROR_INJ_RX_ADD_BYTE_OFFSET 4
+#define CEC_ERROR_INJ_RX_REMOVE_BYTE_OFFSET 6
+#define CEC_ERROR_INJ_RX_ARB_LOST_OFFSET 8
+#define CEC_ERROR_INJ_RX_MASK 0xffffULL
+
+/* Transmit error injection options */
+#define CEC_ERROR_INJ_TX_NO_EOM_OFFSET 16
+#define CEC_ERROR_INJ_TX_EARLY_EOM_OFFSET 18
+#define CEC_ERROR_INJ_TX_SHORT_BIT_OFFSET 20
+#define CEC_ERROR_INJ_TX_LONG_BIT_OFFSET 22
+#define CEC_ERROR_INJ_TX_CUSTOM_BIT_OFFSET 24
+#define CEC_ERROR_INJ_TX_SHORT_START_OFFSET 26
+#define CEC_ERROR_INJ_TX_LONG_START_OFFSET 28
+#define CEC_ERROR_INJ_TX_CUSTOM_START_OFFSET 30
+#define CEC_ERROR_INJ_TX_LAST_BIT_OFFSET 32
+#define CEC_ERROR_INJ_TX_ADD_BYTES_OFFSET 34
+#define CEC_ERROR_INJ_TX_REMOVE_BYTE_OFFSET 36
+#define CEC_ERROR_INJ_TX_LOW_DRIVE_OFFSET 38
+#define CEC_ERROR_INJ_TX_MASK 0xffffffffffff0000ULL
+
+#define CEC_ERROR_INJ_RX_LOW_DRIVE_ARG_IDX 0
+#define CEC_ERROR_INJ_RX_ARB_LOST_ARG_IDX 1
+
+#define CEC_ERROR_INJ_TX_ADD_BYTES_ARG_IDX 2
+#define CEC_ERROR_INJ_TX_SHORT_BIT_ARG_IDX 3
+#define CEC_ERROR_INJ_TX_LONG_BIT_ARG_IDX 4
+#define CEC_ERROR_INJ_TX_CUSTOM_BIT_ARG_IDX 5
+#define CEC_ERROR_INJ_TX_LAST_BIT_ARG_IDX 6
+#define CEC_ERROR_INJ_TX_LOW_DRIVE_ARG_IDX 7
+#define CEC_ERROR_INJ_NUM_ARGS 8
+
+/* Special CEC op values */
+#define CEC_ERROR_INJ_OP_ANY 0x00000100
+
+/* The default for the low/high time of the custom pulse */
+#define CEC_TIM_CUSTOM_DEFAULT 1000
+
+#define CEC_NUM_PIN_EVENTS 128
+#define CEC_PIN_EVENT_FL_IS_HIGH (1 << 0)
+#define CEC_PIN_EVENT_FL_DROPPED (1 << 1)
+
+#define CEC_PIN_IRQ_UNCHANGED 0
+#define CEC_PIN_IRQ_DISABLE 1
+#define CEC_PIN_IRQ_ENABLE 2
+
+struct cec_pin {
+ struct cec_adapter *adap;
+ const struct cec_pin_ops *ops;
+ struct task_struct *kthread;
+ wait_queue_head_t kthread_waitq;
+ struct hrtimer timer;
+ ktime_t ts;
+ unsigned int wait_usecs;
+ u16 la_mask;
+ bool enabled;
+ bool monitor_all;
+ bool rx_eom;
+ bool enable_irq_failed;
+ enum cec_pin_state state;
+ struct cec_msg tx_msg;
+ u32 tx_bit;
+ bool tx_nacked;
+ u32 tx_signal_free_time;
+ bool tx_toggle;
+ struct cec_msg rx_msg;
+ u32 rx_bit;
+ bool rx_toggle;
+ u32 rx_start_bit_low_too_short_cnt;
+ u64 rx_start_bit_low_too_short_ts;
+ u32 rx_start_bit_low_too_short_delta;
+ u32 rx_start_bit_too_short_cnt;
+ u64 rx_start_bit_too_short_ts;
+ u32 rx_start_bit_too_short_delta;
+ u32 rx_start_bit_too_long_cnt;
+ u32 rx_data_bit_too_short_cnt;
+ u64 rx_data_bit_too_short_ts;
+ u32 rx_data_bit_too_short_delta;
+ u32 rx_data_bit_too_long_cnt;
+ u32 rx_low_drive_cnt;
+
+ struct cec_msg work_rx_msg;
+ u8 work_tx_status;
+ ktime_t work_tx_ts;
+ atomic_t work_irq_change;
+ atomic_t work_pin_num_events;
+ unsigned int work_pin_events_wr;
+ unsigned int work_pin_events_rd;
+ ktime_t work_pin_ts[CEC_NUM_PIN_EVENTS];
+ u8 work_pin_events[CEC_NUM_PIN_EVENTS];
+ bool work_pin_events_dropped;
+ u32 work_pin_events_dropped_cnt;
+ ktime_t timer_ts;
+ u32 timer_cnt;
+ u32 timer_100ms_overruns;
+ u32 timer_300ms_overruns;
+ u32 timer_max_overrun;
+ u32 timer_sum_overrun;
+
+ u32 tx_custom_low_usecs;
+ u32 tx_custom_high_usecs;
+ bool tx_ignore_nack_until_eom;
+ bool tx_custom_pulse;
+ bool tx_generated_poll;
+ bool tx_post_eom;
+ u8 tx_extra_bytes;
+ u32 tx_low_drive_cnt;
+#ifdef CONFIG_CEC_PIN_ERROR_INJ
+ u64 error_inj[CEC_ERROR_INJ_OP_ANY + 1];
+ u8 error_inj_args[CEC_ERROR_INJ_OP_ANY + 1][CEC_ERROR_INJ_NUM_ARGS];
+#endif
+};
+
+void cec_pin_start_timer(struct cec_pin *pin);
+
+#ifdef CONFIG_CEC_PIN_ERROR_INJ
+bool cec_pin_error_inj_parse_line(struct cec_adapter *adap, char *line);
+int cec_pin_error_inj_show(struct cec_adapter *adap, struct seq_file *sf);
+
+u16 cec_pin_rx_error_inj(struct cec_pin *pin);
+u16 cec_pin_tx_error_inj(struct cec_pin *pin);
+#endif
+
+#endif
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/sched/types.h>
+
+#include <media/cec-pin.h>
+#include "cec-pin-priv.h"
+
+/* All timings are in microseconds */
+
+/* start bit timings */
+#define CEC_TIM_START_BIT_LOW 3700
+#define CEC_TIM_START_BIT_LOW_MIN 3500
+#define CEC_TIM_START_BIT_LOW_MAX 3900
+#define CEC_TIM_START_BIT_TOTAL 4500
+#define CEC_TIM_START_BIT_TOTAL_MIN 4300
+#define CEC_TIM_START_BIT_TOTAL_MAX 4700
+
+/* data bit timings */
+#define CEC_TIM_DATA_BIT_0_LOW 1500
+#define CEC_TIM_DATA_BIT_0_LOW_MIN 1300
+#define CEC_TIM_DATA_BIT_0_LOW_MAX 1700
+#define CEC_TIM_DATA_BIT_1_LOW 600
+#define CEC_TIM_DATA_BIT_1_LOW_MIN 400
+#define CEC_TIM_DATA_BIT_1_LOW_MAX 800
+#define CEC_TIM_DATA_BIT_TOTAL 2400
+#define CEC_TIM_DATA_BIT_TOTAL_MIN 2050
+#define CEC_TIM_DATA_BIT_TOTAL_MAX 2750
+/* earliest safe time to sample the bit state */
+#define CEC_TIM_DATA_BIT_SAMPLE 850
+/* earliest time the bit is back to 1 (T7 + 50) */
+#define CEC_TIM_DATA_BIT_HIGH 1750
+
+/* when idle, sample once per millisecond */
+#define CEC_TIM_IDLE_SAMPLE 1000
+/* when processing the start bit, sample twice per millisecond */
+#define CEC_TIM_START_BIT_SAMPLE 500
+/* when polling for a state change, sample once every 50 microseconds */
+#define CEC_TIM_SAMPLE 50
+
+#define CEC_TIM_LOW_DRIVE_ERROR (1.5 * CEC_TIM_DATA_BIT_TOTAL)
+
+/*
+ * Total data bit time that is too short/long for a valid bit,
+ * used for error injection.
+ */
+#define CEC_TIM_DATA_BIT_TOTAL_SHORT 1800
+#define CEC_TIM_DATA_BIT_TOTAL_LONG 2900
+
+/*
+ * Total start bit time that is too short/long for a valid bit,
+ * used for error injection.
+ */
+#define CEC_TIM_START_BIT_TOTAL_SHORT 4100
+#define CEC_TIM_START_BIT_TOTAL_LONG 5000
+
+/* Data bits are 0-7, EOM is bit 8 and ACK is bit 9 */
+#define EOM_BIT 8
+#define ACK_BIT 9
+
+struct cec_state {
+ const char * const name;
+ unsigned int usecs;
+};
+
+static const struct cec_state states[CEC_PIN_STATES] = {
+ { "Off", 0 },
+ { "Idle", CEC_TIM_IDLE_SAMPLE },
+ { "Tx Wait", CEC_TIM_SAMPLE },
+ { "Tx Wait for High", CEC_TIM_IDLE_SAMPLE },
+ { "Tx Start Bit Low", CEC_TIM_START_BIT_LOW },
+ { "Tx Start Bit High", CEC_TIM_START_BIT_TOTAL - CEC_TIM_START_BIT_LOW },
+ { "Tx Start Bit High Short", CEC_TIM_START_BIT_TOTAL_SHORT - CEC_TIM_START_BIT_LOW },
+ { "Tx Start Bit High Long", CEC_TIM_START_BIT_TOTAL_LONG - CEC_TIM_START_BIT_LOW },
+ { "Tx Start Bit Low Custom", 0 },
+ { "Tx Start Bit High Custom", 0 },
+ { "Tx Data 0 Low", CEC_TIM_DATA_BIT_0_LOW },
+ { "Tx Data 0 High", CEC_TIM_DATA_BIT_TOTAL - CEC_TIM_DATA_BIT_0_LOW },
+ { "Tx Data 0 High Short", CEC_TIM_DATA_BIT_TOTAL_SHORT - CEC_TIM_DATA_BIT_0_LOW },
+ { "Tx Data 0 High Long", CEC_TIM_DATA_BIT_TOTAL_LONG - CEC_TIM_DATA_BIT_0_LOW },
+ { "Tx Data 1 Low", CEC_TIM_DATA_BIT_1_LOW },
+ { "Tx Data 1 High", CEC_TIM_DATA_BIT_TOTAL - CEC_TIM_DATA_BIT_1_LOW },
+ { "Tx Data 1 High Short", CEC_TIM_DATA_BIT_TOTAL_SHORT - CEC_TIM_DATA_BIT_1_LOW },
+ { "Tx Data 1 High Long", CEC_TIM_DATA_BIT_TOTAL_LONG - CEC_TIM_DATA_BIT_1_LOW },
+ { "Tx Data 1 High Pre Sample", CEC_TIM_DATA_BIT_SAMPLE - CEC_TIM_DATA_BIT_1_LOW },
+ { "Tx Data 1 High Post Sample", CEC_TIM_DATA_BIT_TOTAL - CEC_TIM_DATA_BIT_SAMPLE },
+ { "Tx Data 1 High Post Sample Short", CEC_TIM_DATA_BIT_TOTAL_SHORT - CEC_TIM_DATA_BIT_SAMPLE },
+ { "Tx Data 1 High Post Sample Long", CEC_TIM_DATA_BIT_TOTAL_LONG - CEC_TIM_DATA_BIT_SAMPLE },
+ { "Tx Data Bit Low Custom", 0 },
+ { "Tx Data Bit High Custom", 0 },
+ { "Tx Pulse Low Custom", 0 },
+ { "Tx Pulse High Custom", 0 },
+ { "Tx Low Drive", CEC_TIM_LOW_DRIVE_ERROR },
+ { "Rx Start Bit Low", CEC_TIM_SAMPLE },
+ { "Rx Start Bit High", CEC_TIM_SAMPLE },
+ { "Rx Data Sample", CEC_TIM_DATA_BIT_SAMPLE },
+ { "Rx Data Post Sample", CEC_TIM_DATA_BIT_HIGH - CEC_TIM_DATA_BIT_SAMPLE },
+ { "Rx Data Wait for Low", CEC_TIM_SAMPLE },
+ { "Rx Ack Low", CEC_TIM_DATA_BIT_0_LOW },
+ { "Rx Ack Low Post", CEC_TIM_DATA_BIT_HIGH - CEC_TIM_DATA_BIT_0_LOW },
+ { "Rx Ack High Post", CEC_TIM_DATA_BIT_HIGH },
+ { "Rx Ack Finish", CEC_TIM_DATA_BIT_TOTAL_MIN - CEC_TIM_DATA_BIT_HIGH },
+ { "Rx Low Drive", CEC_TIM_LOW_DRIVE_ERROR },
+ { "Rx Irq", 0 },
+};
+
+static void cec_pin_update(struct cec_pin *pin, bool v, bool force)
+{
+ if (!force && v == pin->adap->cec_pin_is_high)
+ return;
+
+ pin->adap->cec_pin_is_high = v;
+ if (atomic_read(&pin->work_pin_num_events) < CEC_NUM_PIN_EVENTS) {
+ u8 ev = v;
+
+ if (pin->work_pin_events_dropped) {
+ pin->work_pin_events_dropped = false;
+ ev |= CEC_PIN_EVENT_FL_DROPPED;
+ }
+ pin->work_pin_events[pin->work_pin_events_wr] = ev;
+ pin->work_pin_ts[pin->work_pin_events_wr] = ktime_get();
+ pin->work_pin_events_wr =
+ (pin->work_pin_events_wr + 1) % CEC_NUM_PIN_EVENTS;
+ atomic_inc(&pin->work_pin_num_events);
+ } else {
+ pin->work_pin_events_dropped = true;
+ pin->work_pin_events_dropped_cnt++;
+ }
+ wake_up_interruptible(&pin->kthread_waitq);
+}
+
+static bool cec_pin_read(struct cec_pin *pin)
+{
+ bool v = pin->ops->read(pin->adap);
+
+ cec_pin_update(pin, v, false);
+ return v;
+}
+
+static void cec_pin_low(struct cec_pin *pin)
+{
+ pin->ops->low(pin->adap);
+ cec_pin_update(pin, false, false);
+}
+
+static bool cec_pin_high(struct cec_pin *pin)
+{
+ pin->ops->high(pin->adap);
+ return cec_pin_read(pin);
+}
+
+static bool rx_error_inj(struct cec_pin *pin, unsigned int mode_offset,
+ int arg_idx, u8 *arg)
+{
+#ifdef CONFIG_CEC_PIN_ERROR_INJ
+ u16 cmd = cec_pin_rx_error_inj(pin);
+ u64 e = pin->error_inj[cmd];
+ unsigned int mode = (e >> mode_offset) & CEC_ERROR_INJ_MODE_MASK;
+
+ if (arg_idx >= 0) {
+ u8 pos = pin->error_inj_args[cmd][arg_idx];
+
+ if (arg)
+ *arg = pos;
+ else if (pos != pin->rx_bit)
+ return false;
+ }
+
+ switch (mode) {
+ case CEC_ERROR_INJ_MODE_ONCE:
+ pin->error_inj[cmd] &=
+ ~(CEC_ERROR_INJ_MODE_MASK << mode_offset);
+ return true;
+ case CEC_ERROR_INJ_MODE_ALWAYS:
+ return true;
+ case CEC_ERROR_INJ_MODE_TOGGLE:
+ return pin->rx_toggle;
+ default:
+ return false;
+ }
+#else
+ return false;
+#endif
+}
+
+static bool rx_nack(struct cec_pin *pin)
+{
+ return rx_error_inj(pin, CEC_ERROR_INJ_RX_NACK_OFFSET, -1, NULL);
+}
+
+static bool rx_low_drive(struct cec_pin *pin)
+{
+ return rx_error_inj(pin, CEC_ERROR_INJ_RX_LOW_DRIVE_OFFSET,
+ CEC_ERROR_INJ_RX_LOW_DRIVE_ARG_IDX, NULL);
+}
+
+static bool rx_add_byte(struct cec_pin *pin)
+{
+ return rx_error_inj(pin, CEC_ERROR_INJ_RX_ADD_BYTE_OFFSET, -1, NULL);
+}
+
+static bool rx_remove_byte(struct cec_pin *pin)
+{
+ return rx_error_inj(pin, CEC_ERROR_INJ_RX_REMOVE_BYTE_OFFSET, -1, NULL);
+}
+
+static bool rx_arb_lost(struct cec_pin *pin, u8 *poll)
+{
+ return pin->tx_msg.len == 0 &&
+ rx_error_inj(pin, CEC_ERROR_INJ_RX_ARB_LOST_OFFSET,
+ CEC_ERROR_INJ_RX_ARB_LOST_ARG_IDX, poll);
+}
+
+static bool tx_error_inj(struct cec_pin *pin, unsigned int mode_offset,
+ int arg_idx, u8 *arg)
+{
+#ifdef CONFIG_CEC_PIN_ERROR_INJ
+ u16 cmd = cec_pin_tx_error_inj(pin);
+ u64 e = pin->error_inj[cmd];
+ unsigned int mode = (e >> mode_offset) & CEC_ERROR_INJ_MODE_MASK;
+
+ if (arg_idx >= 0) {
+ u8 pos = pin->error_inj_args[cmd][arg_idx];
+
+ if (arg)
+ *arg = pos;
+ else if (pos != pin->tx_bit)
+ return false;
+ }
+
+ switch (mode) {
+ case CEC_ERROR_INJ_MODE_ONCE:
+ pin->error_inj[cmd] &=
+ ~(CEC_ERROR_INJ_MODE_MASK << mode_offset);
+ return true;
+ case CEC_ERROR_INJ_MODE_ALWAYS:
+ return true;
+ case CEC_ERROR_INJ_MODE_TOGGLE:
+ return pin->tx_toggle;
+ default:
+ return false;
+ }
+#else
+ return false;
+#endif
+}
+
+static bool tx_no_eom(struct cec_pin *pin)
+{
+ return tx_error_inj(pin, CEC_ERROR_INJ_TX_NO_EOM_OFFSET, -1, NULL);
+}
+
+static bool tx_early_eom(struct cec_pin *pin)
+{
+ return tx_error_inj(pin, CEC_ERROR_INJ_TX_EARLY_EOM_OFFSET, -1, NULL);
+}
+
+static bool tx_short_bit(struct cec_pin *pin)
+{
+ return tx_error_inj(pin, CEC_ERROR_INJ_TX_SHORT_BIT_OFFSET,
+ CEC_ERROR_INJ_TX_SHORT_BIT_ARG_IDX, NULL);
+}
+
+static bool tx_long_bit(struct cec_pin *pin)
+{
+ return tx_error_inj(pin, CEC_ERROR_INJ_TX_LONG_BIT_OFFSET,
+ CEC_ERROR_INJ_TX_LONG_BIT_ARG_IDX, NULL);
+}
+
+static bool tx_custom_bit(struct cec_pin *pin)
+{
+ return tx_error_inj(pin, CEC_ERROR_INJ_TX_CUSTOM_BIT_OFFSET,
+ CEC_ERROR_INJ_TX_CUSTOM_BIT_ARG_IDX, NULL);
+}
+
+static bool tx_short_start(struct cec_pin *pin)
+{
+ return tx_error_inj(pin, CEC_ERROR_INJ_TX_SHORT_START_OFFSET, -1, NULL);
+}
+
+static bool tx_long_start(struct cec_pin *pin)
+{
+ return tx_error_inj(pin, CEC_ERROR_INJ_TX_LONG_START_OFFSET, -1, NULL);
+}
+
+static bool tx_custom_start(struct cec_pin *pin)
+{
+ return tx_error_inj(pin, CEC_ERROR_INJ_TX_CUSTOM_START_OFFSET,
+ -1, NULL);
+}
+
+static bool tx_last_bit(struct cec_pin *pin)
+{
+ return tx_error_inj(pin, CEC_ERROR_INJ_TX_LAST_BIT_OFFSET,
+ CEC_ERROR_INJ_TX_LAST_BIT_ARG_IDX, NULL);
+}
+
+static u8 tx_add_bytes(struct cec_pin *pin)
+{
+ u8 bytes;
+
+ if (tx_error_inj(pin, CEC_ERROR_INJ_TX_ADD_BYTES_OFFSET,
+ CEC_ERROR_INJ_TX_ADD_BYTES_ARG_IDX, &bytes))
+ return bytes;
+ return 0;
+}
+
+static bool tx_remove_byte(struct cec_pin *pin)
+{
+ return tx_error_inj(pin, CEC_ERROR_INJ_TX_REMOVE_BYTE_OFFSET, -1, NULL);
+}
+
+static bool tx_low_drive(struct cec_pin *pin)
+{
+ return tx_error_inj(pin, CEC_ERROR_INJ_TX_LOW_DRIVE_OFFSET,
+ CEC_ERROR_INJ_TX_LOW_DRIVE_ARG_IDX, NULL);
+}
+
+static void cec_pin_to_idle(struct cec_pin *pin)
+{
+ /*
+ * Reset all status fields, release the bus and
+ * go to idle state.
+ */
+ pin->rx_bit = pin->tx_bit = 0;
+ pin->rx_msg.len = 0;
+ memset(pin->rx_msg.msg, 0, sizeof(pin->rx_msg.msg));
+ pin->ts = ns_to_ktime(0);
+ pin->tx_generated_poll = false;
+ pin->tx_post_eom = false;
+ if (pin->state >= CEC_ST_TX_WAIT &&
+ pin->state <= CEC_ST_TX_LOW_DRIVE)
+ pin->tx_toggle ^= 1;
+ if (pin->state >= CEC_ST_RX_START_BIT_LOW &&
+ pin->state <= CEC_ST_RX_LOW_DRIVE)
+ pin->rx_toggle ^= 1;
+ pin->state = CEC_ST_IDLE;
+}
+
+/*
+ * Handle Transmit-related states
+ *
+ * Basic state changes when transmitting:
+ *
+ * Idle -> Tx Wait (waiting for the end of signal free time) ->
+ * Tx Start Bit Low -> Tx Start Bit High ->
+ *
+ * Regular data bits + EOM:
+ * Tx Data 0 Low -> Tx Data 0 High ->
+ * or:
+ * Tx Data 1 Low -> Tx Data 1 High ->
+ *
+ * First 4 data bits or Ack bit:
+ * Tx Data 0 Low -> Tx Data 0 High ->
+ * or:
+ * Tx Data 1 Low -> Tx Data 1 High -> Tx Data 1 Pre Sample ->
+ * Tx Data 1 Post Sample ->
+ *
+ * After the last Ack go to Idle.
+ *
+ * If it detects a Low Drive condition then:
+ * Tx Wait For High -> Idle
+ *
+ * If it loses arbitration, then it switches to state Rx Data Post Sample.
+ */
+static void cec_pin_tx_states(struct cec_pin *pin, ktime_t ts)
+{
+ bool v;
+ bool is_ack_bit, ack;
+
+ switch (pin->state) {
+ case CEC_ST_TX_WAIT_FOR_HIGH:
+ if (cec_pin_read(pin))
+ cec_pin_to_idle(pin);
+ break;
+
+ case CEC_ST_TX_START_BIT_LOW:
+ if (tx_short_start(pin)) {
+ /*
+ * Error Injection: send an invalid (too short)
+ * start pulse.
+ */
+ pin->state = CEC_ST_TX_START_BIT_HIGH_SHORT;
+ } else if (tx_long_start(pin)) {
+ /*
+ * Error Injection: send an invalid (too long)
+ * start pulse.
+ */
+ pin->state = CEC_ST_TX_START_BIT_HIGH_LONG;
+ } else {
+ pin->state = CEC_ST_TX_START_BIT_HIGH;
+ }
+ /* Generate start bit */
+ cec_pin_high(pin);
+ break;
+
+ case CEC_ST_TX_START_BIT_LOW_CUSTOM:
+ pin->state = CEC_ST_TX_START_BIT_HIGH_CUSTOM;
+ /* Generate start bit */
+ cec_pin_high(pin);
+ break;
+
+ case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE:
+ case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_SHORT:
+ case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_LONG:
+ if (pin->tx_nacked) {
+ cec_pin_to_idle(pin);
+ pin->tx_msg.len = 0;
+ if (pin->tx_generated_poll)
+ break;
+ pin->work_tx_ts = ts;
+ pin->work_tx_status = CEC_TX_STATUS_NACK;
+ wake_up_interruptible(&pin->kthread_waitq);
+ break;
+ }
+ /* fall through */
+ case CEC_ST_TX_DATA_BIT_0_HIGH:
+ case CEC_ST_TX_DATA_BIT_0_HIGH_SHORT:
+ case CEC_ST_TX_DATA_BIT_0_HIGH_LONG:
+ case CEC_ST_TX_DATA_BIT_1_HIGH:
+ case CEC_ST_TX_DATA_BIT_1_HIGH_SHORT:
+ case CEC_ST_TX_DATA_BIT_1_HIGH_LONG:
+ /*
+ * If the read value is 1, then all is OK, otherwise we have a
+ * low drive condition.
+ *
+ * Special case: when we generate a poll message due to an
+ * Arbitration Lost error injection, then ignore this since
+ * the pin can actually be low in that case.
+ */
+ if (!cec_pin_read(pin) && !pin->tx_generated_poll) {
+ /*
+ * It's 0, so someone detected an error and pulled the
+ * line low for 1.5 times the nominal bit period.
+ */
+ pin->tx_msg.len = 0;
+ pin->state = CEC_ST_TX_WAIT_FOR_HIGH;
+ pin->work_tx_ts = ts;
+ pin->work_tx_status = CEC_TX_STATUS_LOW_DRIVE;
+ pin->tx_low_drive_cnt++;
+ wake_up_interruptible(&pin->kthread_waitq);
+ break;
+ }
+ /* fall through */
+ case CEC_ST_TX_DATA_BIT_HIGH_CUSTOM:
+ if (tx_last_bit(pin)) {
+ /* Error Injection: just stop sending after this bit */
+ cec_pin_to_idle(pin);
+ pin->tx_msg.len = 0;
+ if (pin->tx_generated_poll)
+ break;
+ pin->work_tx_ts = ts;
+ pin->work_tx_status = CEC_TX_STATUS_OK;
+ wake_up_interruptible(&pin->kthread_waitq);
+ break;
+ }
+ pin->tx_bit++;
+ /* fall through */
+ case CEC_ST_TX_START_BIT_HIGH:
+ case CEC_ST_TX_START_BIT_HIGH_SHORT:
+ case CEC_ST_TX_START_BIT_HIGH_LONG:
+ case CEC_ST_TX_START_BIT_HIGH_CUSTOM:
+ if (tx_low_drive(pin)) {
+ /* Error injection: go to low drive */
+ cec_pin_low(pin);
+ pin->state = CEC_ST_TX_LOW_DRIVE;
+ pin->tx_msg.len = 0;
+ if (pin->tx_generated_poll)
+ break;
+ pin->work_tx_ts = ts;
+ pin->work_tx_status = CEC_TX_STATUS_LOW_DRIVE;
+ pin->tx_low_drive_cnt++;
+ wake_up_interruptible(&pin->kthread_waitq);
+ break;
+ }
+ if (pin->tx_bit / 10 >= pin->tx_msg.len + pin->tx_extra_bytes) {
+ cec_pin_to_idle(pin);
+ pin->tx_msg.len = 0;
+ if (pin->tx_generated_poll)
+ break;
+ pin->work_tx_ts = ts;
+ pin->work_tx_status = CEC_TX_STATUS_OK;
+ wake_up_interruptible(&pin->kthread_waitq);
+ break;
+ }
+
+ switch (pin->tx_bit % 10) {
+ default: {
+ /*
+ * In the CEC_ERROR_INJ_TX_ADD_BYTES case we transmit
+ * extra bytes, so pin->tx_bit / 10 can become >= 16.
+ * Generate bit values for those extra bytes instead
+ * of reading them from the transmit buffer.
+ */
+ unsigned int idx = (pin->tx_bit / 10);
+ u8 val = idx;
+
+ if (idx < pin->tx_msg.len)
+ val = pin->tx_msg.msg[idx];
+ v = val & (1 << (7 - (pin->tx_bit % 10)));
+
+ pin->state = v ? CEC_ST_TX_DATA_BIT_1_LOW :
+ CEC_ST_TX_DATA_BIT_0_LOW;
+ break;
+ }
+ case EOM_BIT: {
+ unsigned int tot_len = pin->tx_msg.len +
+ pin->tx_extra_bytes;
+ unsigned int tx_byte_idx = pin->tx_bit / 10;
+
+ v = !pin->tx_post_eom && tx_byte_idx == tot_len - 1;
+ if (tot_len > 1 && tx_byte_idx == tot_len - 2 &&
+ tx_early_eom(pin)) {
+ /* Error injection: set EOM one byte early */
+ v = true;
+ pin->tx_post_eom = true;
+ } else if (v && tx_no_eom(pin)) {
+ /* Error injection: no EOM */
+ v = false;
+ }
+ pin->state = v ? CEC_ST_TX_DATA_BIT_1_LOW :
+ CEC_ST_TX_DATA_BIT_0_LOW;
+ break;
+ }
+ case ACK_BIT:
+ pin->state = CEC_ST_TX_DATA_BIT_1_LOW;
+ break;
+ }
+ if (tx_custom_bit(pin))
+ pin->state = CEC_ST_TX_DATA_BIT_LOW_CUSTOM;
+ cec_pin_low(pin);
+ break;
+
+ case CEC_ST_TX_DATA_BIT_0_LOW:
+ case CEC_ST_TX_DATA_BIT_1_LOW:
+ v = pin->state == CEC_ST_TX_DATA_BIT_1_LOW;
+ is_ack_bit = pin->tx_bit % 10 == ACK_BIT;
+ if (v && (pin->tx_bit < 4 || is_ack_bit)) {
+ pin->state = CEC_ST_TX_DATA_BIT_1_HIGH_PRE_SAMPLE;
+ } else if (!is_ack_bit && tx_short_bit(pin)) {
+ /* Error Injection: send an invalid (too short) bit */
+ pin->state = v ? CEC_ST_TX_DATA_BIT_1_HIGH_SHORT :
+ CEC_ST_TX_DATA_BIT_0_HIGH_SHORT;
+ } else if (!is_ack_bit && tx_long_bit(pin)) {
+ /* Error Injection: send an invalid (too long) bit */
+ pin->state = v ? CEC_ST_TX_DATA_BIT_1_HIGH_LONG :
+ CEC_ST_TX_DATA_BIT_0_HIGH_LONG;
+ } else {
+ pin->state = v ? CEC_ST_TX_DATA_BIT_1_HIGH :
+ CEC_ST_TX_DATA_BIT_0_HIGH;
+ }
+ cec_pin_high(pin);
+ break;
+
+ case CEC_ST_TX_DATA_BIT_LOW_CUSTOM:
+ pin->state = CEC_ST_TX_DATA_BIT_HIGH_CUSTOM;
+ cec_pin_high(pin);
+ break;
+
+ case CEC_ST_TX_DATA_BIT_1_HIGH_PRE_SAMPLE:
+ /* Read the CEC value at the sample time */
+ v = cec_pin_read(pin);
+ is_ack_bit = pin->tx_bit % 10 == ACK_BIT;
+ /*
+ * If v == 0 and we're within the first 4 bits
+ * of the initiator, then someone else started
+ * transmitting and we lost the arbitration
+ * (i.e. the logical address of the other
+ * transmitter has more leading 0 bits in the
+ * initiator).
+ */
+ if (!v && !is_ack_bit && !pin->tx_generated_poll) {
+ pin->tx_msg.len = 0;
+ pin->work_tx_ts = ts;
+ pin->work_tx_status = CEC_TX_STATUS_ARB_LOST;
+ wake_up_interruptible(&pin->kthread_waitq);
+ pin->rx_bit = pin->tx_bit;
+ pin->tx_bit = 0;
+ memset(pin->rx_msg.msg, 0, sizeof(pin->rx_msg.msg));
+ pin->rx_msg.msg[0] = pin->tx_msg.msg[0];
+ pin->rx_msg.msg[0] &= (0xff << (8 - pin->rx_bit));
+ pin->rx_msg.len = 0;
+ pin->ts = ktime_sub_us(ts, CEC_TIM_DATA_BIT_SAMPLE);
+ pin->state = CEC_ST_RX_DATA_POST_SAMPLE;
+ pin->rx_bit++;
+ break;
+ }
+ pin->state = CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE;
+ if (!is_ack_bit && tx_short_bit(pin)) {
+ /* Error Injection: send an invalid (too short) bit */
+ pin->state = CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_SHORT;
+ } else if (!is_ack_bit && tx_long_bit(pin)) {
+ /* Error Injection: send an invalid (too long) bit */
+ pin->state = CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_LONG;
+ }
+ if (!is_ack_bit)
+ break;
+ /* Was the message ACKed? */
+ ack = cec_msg_is_broadcast(&pin->tx_msg) ? v : !v;
+ if (!ack && (!pin->tx_ignore_nack_until_eom ||
+ pin->tx_bit / 10 == pin->tx_msg.len - 1) &&
+ !pin->tx_post_eom) {
+ /*
+ * Note: the CEC spec is ambiguous regarding
+ * what action to take when a NACK appears
+ * before the last byte of the payload was
+ * transmitted: either stop transmitting
+ * immediately, or wait until the last byte
+ * was transmitted.
+ *
+ * Most CEC implementations appear to stop
+ * immediately, and that's what we do here
+ * as well.
+ */
+ pin->tx_nacked = true;
+ }
+ break;
+
+ case CEC_ST_TX_PULSE_LOW_CUSTOM:
+ cec_pin_high(pin);
+ pin->state = CEC_ST_TX_PULSE_HIGH_CUSTOM;
+ break;
+
+ case CEC_ST_TX_PULSE_HIGH_CUSTOM:
+ cec_pin_to_idle(pin);
+ break;
+
+ default:
+ break;
+ }
+}
+
+/*
+ * Handle Receive-related states
+ *
+ * Basic state changes when receiving:
+ *
+ * Rx Start Bit Low -> Rx Start Bit High ->
+ * Regular data bits + EOM:
+ * Rx Data Sample -> Rx Data Post Sample -> Rx Data High ->
+ * Ack bit 0:
+ * Rx Ack Low -> Rx Ack Low Post -> Rx Data High ->
+ * Ack bit 1:
+ * Rx Ack High Post -> Rx Data High ->
+ * Ack bit 0 && EOM:
+ * Rx Ack Low -> Rx Ack Low Post -> Rx Ack Finish -> Idle
+ */
+static void cec_pin_rx_states(struct cec_pin *pin, ktime_t ts)
+{
+ s32 delta;
+ bool v;
+ bool ack;
+ bool bcast, for_us;
+ u8 dest;
+ u8 poll;
+
+ switch (pin->state) {
+ /* Receive states */
+ case CEC_ST_RX_START_BIT_LOW:
+ v = cec_pin_read(pin);
+ if (!v)
+ break;
+ pin->state = CEC_ST_RX_START_BIT_HIGH;
+ delta = ktime_us_delta(ts, pin->ts);
+ /* Start bit low is too short, go back to idle */
+ if (delta < CEC_TIM_START_BIT_LOW_MIN - CEC_TIM_IDLE_SAMPLE) {
+ if (!pin->rx_start_bit_low_too_short_cnt++) {
+ pin->rx_start_bit_low_too_short_ts = ktime_to_ns(pin->ts);
+ pin->rx_start_bit_low_too_short_delta = delta;
+ }
+ cec_pin_to_idle(pin);
+ break;
+ }
+ if (rx_arb_lost(pin, &poll)) {
+ cec_msg_init(&pin->tx_msg, poll >> 4, poll & 0xf);
+ pin->tx_generated_poll = true;
+ pin->tx_extra_bytes = 0;
+ pin->state = CEC_ST_TX_START_BIT_HIGH;
+ pin->ts = ts;
+ }
+ break;
+
+ case CEC_ST_RX_START_BIT_HIGH:
+ v = cec_pin_read(pin);
+ delta = ktime_us_delta(ts, pin->ts);
+ /*
+ * Unfortunately the spec does not specify when to give up
+ * and go to idle. We just pick TOTAL_LONG.
+ */
+ if (v && delta > CEC_TIM_START_BIT_TOTAL_LONG) {
+ pin->rx_start_bit_too_long_cnt++;
+ cec_pin_to_idle(pin);
+ break;
+ }
+ if (v)
+ break;
+ /* Start bit is too short, go back to idle */
+ if (delta < CEC_TIM_START_BIT_TOTAL_MIN - CEC_TIM_IDLE_SAMPLE) {
+ if (!pin->rx_start_bit_too_short_cnt++) {
+ pin->rx_start_bit_too_short_ts = ktime_to_ns(pin->ts);
+ pin->rx_start_bit_too_short_delta = delta;
+ }
+ cec_pin_to_idle(pin);
+ break;
+ }
+ if (rx_low_drive(pin)) {
+ /* Error injection: go to low drive */
+ cec_pin_low(pin);
+ pin->state = CEC_ST_RX_LOW_DRIVE;
+ pin->rx_low_drive_cnt++;
+ break;
+ }
+ pin->state = CEC_ST_RX_DATA_SAMPLE;
+ pin->ts = ts;
+ pin->rx_eom = false;
+ break;
+
+ case CEC_ST_RX_DATA_SAMPLE:
+ v = cec_pin_read(pin);
+ pin->state = CEC_ST_RX_DATA_POST_SAMPLE;
+ switch (pin->rx_bit % 10) {
+ default:
+ if (pin->rx_bit / 10 < CEC_MAX_MSG_SIZE)
+ pin->rx_msg.msg[pin->rx_bit / 10] |=
+ v << (7 - (pin->rx_bit % 10));
+ break;
+ case EOM_BIT:
+ pin->rx_eom = v;
+ pin->rx_msg.len = pin->rx_bit / 10 + 1;
+ break;
+ case ACK_BIT:
+ break;
+ }
+ pin->rx_bit++;
+ break;
+
+ case CEC_ST_RX_DATA_POST_SAMPLE:
+ pin->state = CEC_ST_RX_DATA_WAIT_FOR_LOW;
+ break;
+
+ case CEC_ST_RX_DATA_WAIT_FOR_LOW:
+ v = cec_pin_read(pin);
+ delta = ktime_us_delta(ts, pin->ts);
+ /*
+ * Unfortunately the spec does not specify when to give up
+ * and go to idle. We just pick TOTAL_LONG.
+ */
+ if (v && delta > CEC_TIM_DATA_BIT_TOTAL_LONG) {
+ pin->rx_data_bit_too_long_cnt++;
+ cec_pin_to_idle(pin);
+ break;
+ }
+ if (v)
+ break;
+
+ if (rx_low_drive(pin)) {
+ /* Error injection: go to low drive */
+ cec_pin_low(pin);
+ pin->state = CEC_ST_RX_LOW_DRIVE;
+ pin->rx_low_drive_cnt++;
+ break;
+ }
+
+ /*
+ * Go to low drive state when the total bit time is
+ * too short.
+ */
+ if (delta < CEC_TIM_DATA_BIT_TOTAL_MIN) {
+ if (!pin->rx_data_bit_too_short_cnt++) {
+ pin->rx_data_bit_too_short_ts = ktime_to_ns(pin->ts);
+ pin->rx_data_bit_too_short_delta = delta;
+ }
+ cec_pin_low(pin);
+ pin->state = CEC_ST_RX_LOW_DRIVE;
+ pin->rx_low_drive_cnt++;
+ break;
+ }
+ pin->ts = ts;
+ if (pin->rx_bit % 10 != 9) {
+ pin->state = CEC_ST_RX_DATA_SAMPLE;
+ break;
+ }
+
+ dest = cec_msg_destination(&pin->rx_msg);
+ bcast = dest == CEC_LOG_ADDR_BROADCAST;
+ /* for_us == broadcast or directed to us */
+ for_us = bcast || (pin->la_mask & (1 << dest));
+ /* ACK bit value */
+ ack = bcast ? 1 : !for_us;
+
+ if (for_us && rx_nack(pin)) {
+ /* Error injection: toggle the ACK bit */
+ ack = !ack;
+ }
+
+ if (ack) {
+ /* No need to write to the bus, just wait */
+ pin->state = CEC_ST_RX_ACK_HIGH_POST;
+ break;
+ }
+ cec_pin_low(pin);
+ pin->state = CEC_ST_RX_ACK_LOW;
+ break;
+
+ case CEC_ST_RX_ACK_LOW:
+ cec_pin_high(pin);
+ pin->state = CEC_ST_RX_ACK_LOW_POST;
+ break;
+
+ case CEC_ST_RX_ACK_LOW_POST:
+ case CEC_ST_RX_ACK_HIGH_POST:
+ v = cec_pin_read(pin);
+ if (v && pin->rx_eom) {
+ pin->work_rx_msg = pin->rx_msg;
+ pin->work_rx_msg.rx_ts = ktime_to_ns(ts);
+ wake_up_interruptible(&pin->kthread_waitq);
+ pin->ts = ts;
+ pin->state = CEC_ST_RX_ACK_FINISH;
+ break;
+ }
+ pin->rx_bit++;
+ pin->state = CEC_ST_RX_DATA_WAIT_FOR_LOW;
+ break;
+
+ case CEC_ST_RX_ACK_FINISH:
+ cec_pin_to_idle(pin);
+ break;
+
+ default:
+ break;
+ }
+}
+
+/*
+ * Main timer function
+ *
+ */
+static enum hrtimer_restart cec_pin_timer(struct hrtimer *timer)
+{
+ struct cec_pin *pin = container_of(timer, struct cec_pin, timer);
+ struct cec_adapter *adap = pin->adap;
+ ktime_t ts;
+ s32 delta;
+ u32 usecs;
+
+ ts = ktime_get();
+ if (ktime_to_ns(pin->timer_ts)) {
+ delta = ktime_us_delta(ts, pin->timer_ts);
+ pin->timer_cnt++;
+ if (delta > 100 && pin->state != CEC_ST_IDLE) {
+ /* Keep track of timer overruns */
+ pin->timer_sum_overrun += delta;
+ pin->timer_100ms_overruns++;
+ if (delta > 300)
+ pin->timer_300ms_overruns++;
+ if (delta > pin->timer_max_overrun)
+ pin->timer_max_overrun = delta;
+ }
+ }
+ if (adap->monitor_pin_cnt)
+ cec_pin_read(pin);
+
+ if (pin->wait_usecs) {
+ /*
+ * If we are monitoring the pin, then we have to
+ * sample at regular intervals.
+ */
+ if (pin->wait_usecs > 150) {
+ pin->wait_usecs -= 100;
+ pin->timer_ts = ktime_add_us(ts, 100);
+ hrtimer_forward_now(timer, ns_to_ktime(100000));
+ return HRTIMER_RESTART;
+ }
+ if (pin->wait_usecs > 100) {
+ pin->wait_usecs /= 2;
+ pin->timer_ts = ktime_add_us(ts, pin->wait_usecs);
+ hrtimer_forward_now(timer,
+ ns_to_ktime(pin->wait_usecs * 1000));
+ return HRTIMER_RESTART;
+ }
+ pin->timer_ts = ktime_add_us(ts, pin->wait_usecs);
+ hrtimer_forward_now(timer,
+ ns_to_ktime(pin->wait_usecs * 1000));
+ pin->wait_usecs = 0;
+ return HRTIMER_RESTART;
+ }
+
+ switch (pin->state) {
+ /* Transmit states */
+ case CEC_ST_TX_WAIT_FOR_HIGH:
+ case CEC_ST_TX_START_BIT_LOW:
+ case CEC_ST_TX_START_BIT_HIGH:
+ case CEC_ST_TX_START_BIT_HIGH_SHORT:
+ case CEC_ST_TX_START_BIT_HIGH_LONG:
+ case CEC_ST_TX_START_BIT_LOW_CUSTOM:
+ case CEC_ST_TX_START_BIT_HIGH_CUSTOM:
+ case CEC_ST_TX_DATA_BIT_0_LOW:
+ case CEC_ST_TX_DATA_BIT_0_HIGH:
+ case CEC_ST_TX_DATA_BIT_0_HIGH_SHORT:
+ case CEC_ST_TX_DATA_BIT_0_HIGH_LONG:
+ case CEC_ST_TX_DATA_BIT_1_LOW:
+ case CEC_ST_TX_DATA_BIT_1_HIGH:
+ case CEC_ST_TX_DATA_BIT_1_HIGH_SHORT:
+ case CEC_ST_TX_DATA_BIT_1_HIGH_LONG:
+ case CEC_ST_TX_DATA_BIT_1_HIGH_PRE_SAMPLE:
+ case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE:
+ case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_SHORT:
+ case CEC_ST_TX_DATA_BIT_1_HIGH_POST_SAMPLE_LONG:
+ case CEC_ST_TX_DATA_BIT_LOW_CUSTOM:
+ case CEC_ST_TX_DATA_BIT_HIGH_CUSTOM:
+ case CEC_ST_TX_PULSE_LOW_CUSTOM:
+ case CEC_ST_TX_PULSE_HIGH_CUSTOM:
+ cec_pin_tx_states(pin, ts);
+ break;
+
+ /* Receive states */
+ case CEC_ST_RX_START_BIT_LOW:
+ case CEC_ST_RX_START_BIT_HIGH:
+ case CEC_ST_RX_DATA_SAMPLE:
+ case CEC_ST_RX_DATA_POST_SAMPLE:
+ case CEC_ST_RX_DATA_WAIT_FOR_LOW:
+ case CEC_ST_RX_ACK_LOW:
+ case CEC_ST_RX_ACK_LOW_POST:
+ case CEC_ST_RX_ACK_HIGH_POST:
+ case CEC_ST_RX_ACK_FINISH:
+ cec_pin_rx_states(pin, ts);
+ break;
+
+ case CEC_ST_IDLE:
+ case CEC_ST_TX_WAIT:
+ if (!cec_pin_high(pin)) {
+ /* Start bit, switch to receive state */
+ pin->ts = ts;
+ pin->state = CEC_ST_RX_START_BIT_LOW;
+ /*
+ * If a transmit is pending, then that transmit should
+ * use a signal free time of no more than
+ * CEC_SIGNAL_FREE_TIME_NEW_INITIATOR since it will
+ * have a new initiator due to the receive that is now
+ * starting.
+ */
+ if (pin->tx_msg.len && pin->tx_signal_free_time >
+ CEC_SIGNAL_FREE_TIME_NEW_INITIATOR)
+ pin->tx_signal_free_time =
+ CEC_SIGNAL_FREE_TIME_NEW_INITIATOR;
+ break;
+ }
+ if (ktime_to_ns(pin->ts) == 0)
+ pin->ts = ts;
+ if (pin->tx_msg.len) {
+ /*
+ * Check if the bus has been free for long enough
+ * so we can kick off the pending transmit.
+ */
+ delta = ktime_us_delta(ts, pin->ts);
+ if (delta / CEC_TIM_DATA_BIT_TOTAL >
+ pin->tx_signal_free_time) {
+ pin->tx_nacked = false;
+ if (tx_custom_start(pin))
+ pin->state = CEC_ST_TX_START_BIT_LOW_CUSTOM;
+ else
+ pin->state = CEC_ST_TX_START_BIT_LOW;
+ /* Generate start bit */
+ cec_pin_low(pin);
+ break;
+ }
+ if (delta / CEC_TIM_DATA_BIT_TOTAL >
+ pin->tx_signal_free_time - 1)
+ pin->state = CEC_ST_TX_WAIT;
+ break;
+ }
+ if (pin->tx_custom_pulse && pin->state == CEC_ST_IDLE) {
+ pin->tx_custom_pulse = false;
+ /* Generate custom pulse */
+ cec_pin_low(pin);
+ pin->state = CEC_ST_TX_PULSE_LOW_CUSTOM;
+ break;
+ }
+ if (pin->state != CEC_ST_IDLE || pin->ops->enable_irq == NULL ||
+ pin->enable_irq_failed || adap->is_configuring ||
+ adap->is_configured || adap->monitor_all_cnt)
+ break;
+ /* Switch to interrupt mode */
+ atomic_set(&pin->work_irq_change, CEC_PIN_IRQ_ENABLE);
+ pin->state = CEC_ST_RX_IRQ;
+ wake_up_interruptible(&pin->kthread_waitq);
+ return HRTIMER_NORESTART;
+
+ case CEC_ST_TX_LOW_DRIVE:
+ case CEC_ST_RX_LOW_DRIVE:
+ cec_pin_high(pin);
+ cec_pin_to_idle(pin);
+ break;
+
+ default:
+ break;
+ }
+
+ switch (pin->state) {
+ case CEC_ST_TX_START_BIT_LOW_CUSTOM:
+ case CEC_ST_TX_DATA_BIT_LOW_CUSTOM:
+ case CEC_ST_TX_PULSE_LOW_CUSTOM:
+ usecs = pin->tx_custom_low_usecs;
+ break;
+ case CEC_ST_TX_START_BIT_HIGH_CUSTOM:
+ case CEC_ST_TX_DATA_BIT_HIGH_CUSTOM:
+ case CEC_ST_TX_PULSE_HIGH_CUSTOM:
+ usecs = pin->tx_custom_high_usecs;
+ break;
+ default:
+ usecs = states[pin->state].usecs;
+ break;
+ }
+
+ if (!adap->monitor_pin_cnt || usecs <= 150) {
+ pin->wait_usecs = 0;
+ pin->timer_ts = ktime_add_us(ts, usecs);
+ hrtimer_forward_now(timer,
+ ns_to_ktime(usecs * 1000));
+ return HRTIMER_RESTART;
+ }
+ pin->wait_usecs = usecs - 100;
+ pin->timer_ts = ktime_add_us(ts, 100);
+ hrtimer_forward_now(timer, ns_to_ktime(100000));
+ return HRTIMER_RESTART;
+}
+
+static int cec_pin_thread_func(void *_adap)
+{
+ struct cec_adapter *adap = _adap;
+ struct cec_pin *pin = adap->pin;
+
+ for (;;) {
+ wait_event_interruptible(pin->kthread_waitq,
+ kthread_should_stop() ||
+ pin->work_rx_msg.len ||
+ pin->work_tx_status ||
+ atomic_read(&pin->work_irq_change) ||
+ atomic_read(&pin->work_pin_num_events));
+
+ if (pin->work_rx_msg.len) {
+ struct cec_msg *msg = &pin->work_rx_msg;
+
+ if (msg->len > 1 && msg->len < CEC_MAX_MSG_SIZE &&
+ rx_add_byte(pin)) {
+ /* Error injection: add byte to the message */
+ msg->msg[msg->len++] = 0x55;
+ }
+ if (msg->len > 2 && rx_remove_byte(pin)) {
+ /* Error injection: remove byte from message */
+ msg->len--;
+ }
+ if (msg->len > CEC_MAX_MSG_SIZE)
+ msg->len = CEC_MAX_MSG_SIZE;
+ cec_received_msg_ts(adap, msg,
+ ns_to_ktime(pin->work_rx_msg.rx_ts));
+ msg->len = 0;
+ }
+ if (pin->work_tx_status) {
+ unsigned int tx_status = pin->work_tx_status;
+
+ pin->work_tx_status = 0;
+ cec_transmit_attempt_done_ts(adap, tx_status,
+ pin->work_tx_ts);
+ }
+
+ while (atomic_read(&pin->work_pin_num_events)) {
+ unsigned int idx = pin->work_pin_events_rd;
+ u8 v = pin->work_pin_events[idx];
+
+ cec_queue_pin_cec_event(adap,
+ v & CEC_PIN_EVENT_FL_IS_HIGH,
+ v & CEC_PIN_EVENT_FL_DROPPED,
+ pin->work_pin_ts[idx]);
+ pin->work_pin_events_rd = (idx + 1) % CEC_NUM_PIN_EVENTS;
+ atomic_dec(&pin->work_pin_num_events);
+ }
+
+ switch (atomic_xchg(&pin->work_irq_change,
+ CEC_PIN_IRQ_UNCHANGED)) {
+ case CEC_PIN_IRQ_DISABLE:
+ pin->ops->disable_irq(adap);
+ cec_pin_high(pin);
+ cec_pin_to_idle(pin);
+ hrtimer_start(&pin->timer, ns_to_ktime(0),
+ HRTIMER_MODE_REL);
+ break;
+ case CEC_PIN_IRQ_ENABLE:
+ pin->enable_irq_failed = !pin->ops->enable_irq(adap);
+ if (pin->enable_irq_failed) {
+ cec_pin_to_idle(pin);
+ hrtimer_start(&pin->timer, ns_to_ktime(0),
+ HRTIMER_MODE_REL);
+ }
+ break;
+ default:
+ break;
+ }
+
+ if (kthread_should_stop())
+ break;
+ }
+ return 0;
+}
+
+static int cec_pin_adap_enable(struct cec_adapter *adap, bool enable)
+{
+ struct cec_pin *pin = adap->pin;
+
+ pin->enabled = enable;
+ if (enable) {
+ atomic_set(&pin->work_pin_num_events, 0);
+ pin->work_pin_events_rd = pin->work_pin_events_wr = 0;
+ pin->work_pin_events_dropped = false;
+ cec_pin_read(pin);
+ cec_pin_to_idle(pin);
+ pin->tx_msg.len = 0;
+ pin->timer_ts = ns_to_ktime(0);
+ atomic_set(&pin->work_irq_change, CEC_PIN_IRQ_UNCHANGED);
+ pin->kthread = kthread_run(cec_pin_thread_func, adap,
+ "cec-pin");
+ if (IS_ERR(pin->kthread)) {
+ pr_err("cec-pin: kernel_thread() failed\n");
+ return PTR_ERR(pin->kthread);
+ }
+ hrtimer_start(&pin->timer, ns_to_ktime(0),
+ HRTIMER_MODE_REL);
+ } else {
+ if (pin->ops->disable_irq)
+ pin->ops->disable_irq(adap);
+ hrtimer_cancel(&pin->timer);
+ kthread_stop(pin->kthread);
+ cec_pin_read(pin);
+ cec_pin_to_idle(pin);
+ pin->state = CEC_ST_OFF;
+ }
+ return 0;
+}
+
+static int cec_pin_adap_log_addr(struct cec_adapter *adap, u8 log_addr)
+{
+ struct cec_pin *pin = adap->pin;
+
+ if (log_addr == CEC_LOG_ADDR_INVALID)
+ pin->la_mask = 0;
+ else
+ pin->la_mask |= (1 << log_addr);
+ return 0;
+}
+
+void cec_pin_start_timer(struct cec_pin *pin)
+{
+ if (pin->state != CEC_ST_RX_IRQ)
+ return;
+
+ atomic_set(&pin->work_irq_change, CEC_PIN_IRQ_UNCHANGED);
+ pin->ops->disable_irq(pin->adap);
+ cec_pin_high(pin);
+ cec_pin_to_idle(pin);
+ hrtimer_start(&pin->timer, ns_to_ktime(0), HRTIMER_MODE_REL);
+}
+
+static int cec_pin_adap_transmit(struct cec_adapter *adap, u8 attempts,
+ u32 signal_free_time, struct cec_msg *msg)
+{
+ struct cec_pin *pin = adap->pin;
+
+ /*
+ * If a receive is in progress, then this transmit should use
+ * a signal free time of max CEC_SIGNAL_FREE_TIME_NEW_INITIATOR
+ * since when it starts transmitting it will have a new initiator.
+ */
+ if (pin->state != CEC_ST_IDLE &&
+ signal_free_time > CEC_SIGNAL_FREE_TIME_NEW_INITIATOR)
+ signal_free_time = CEC_SIGNAL_FREE_TIME_NEW_INITIATOR;
+
+ pin->tx_signal_free_time = signal_free_time;
+ pin->tx_extra_bytes = 0;
+ pin->tx_msg = *msg;
+ if (msg->len > 1) {
+ /* Error injection: add byte to the message */
+ pin->tx_extra_bytes = tx_add_bytes(pin);
+ }
+ if (msg->len > 2 && tx_remove_byte(pin)) {
+ /* Error injection: remove byte from the message */
+ pin->tx_msg.len--;
+ }
+ pin->work_tx_status = 0;
+ pin->tx_bit = 0;
+ cec_pin_start_timer(pin);
+ return 0;
+}
+
+static void cec_pin_adap_status(struct cec_adapter *adap,
+ struct seq_file *file)
+{
+ struct cec_pin *pin = adap->pin;
+
+ seq_printf(file, "state: %s\n", states[pin->state].name);
+ seq_printf(file, "tx_bit: %d\n", pin->tx_bit);
+ seq_printf(file, "rx_bit: %d\n", pin->rx_bit);
+ seq_printf(file, "cec pin: %d\n", pin->ops->read(adap));
+ seq_printf(file, "cec pin events dropped: %u\n",
+ pin->work_pin_events_dropped_cnt);
+ seq_printf(file, "irq failed: %d\n", pin->enable_irq_failed);
+ if (pin->timer_100ms_overruns) {
+ seq_printf(file, "timer overruns > 100ms: %u of %u\n",
+ pin->timer_100ms_overruns, pin->timer_cnt);
+ seq_printf(file, "timer overruns > 300ms: %u of %u\n",
+ pin->timer_300ms_overruns, pin->timer_cnt);
+ seq_printf(file, "max timer overrun: %u usecs\n",
+ pin->timer_max_overrun);
+ seq_printf(file, "avg timer overrun: %u usecs\n",
+ pin->timer_sum_overrun / pin->timer_100ms_overruns);
+ }
+ if (pin->rx_start_bit_low_too_short_cnt)
+ seq_printf(file,
+ "rx start bit low too short: %u (delta %u, ts %llu)\n",
+ pin->rx_start_bit_low_too_short_cnt,
+ pin->rx_start_bit_low_too_short_delta,
+ pin->rx_start_bit_low_too_short_ts);
+ if (pin->rx_start_bit_too_short_cnt)
+ seq_printf(file,
+ "rx start bit too short: %u (delta %u, ts %llu)\n",
+ pin->rx_start_bit_too_short_cnt,
+ pin->rx_start_bit_too_short_delta,
+ pin->rx_start_bit_too_short_ts);
+ if (pin->rx_start_bit_too_long_cnt)
+ seq_printf(file, "rx start bit too long: %u\n",
+ pin->rx_start_bit_too_long_cnt);
+ if (pin->rx_data_bit_too_short_cnt)
+ seq_printf(file,
+ "rx data bit too short: %u (delta %u, ts %llu)\n",
+ pin->rx_data_bit_too_short_cnt,
+ pin->rx_data_bit_too_short_delta,
+ pin->rx_data_bit_too_short_ts);
+ if (pin->rx_data_bit_too_long_cnt)
+ seq_printf(file, "rx data bit too long: %u\n",
+ pin->rx_data_bit_too_long_cnt);
+ seq_printf(file, "rx initiated low drive: %u\n", pin->rx_low_drive_cnt);
+ seq_printf(file, "tx detected low drive: %u\n", pin->tx_low_drive_cnt);
+ pin->work_pin_events_dropped_cnt = 0;
+ pin->timer_cnt = 0;
+ pin->timer_100ms_overruns = 0;
+ pin->timer_300ms_overruns = 0;
+ pin->timer_max_overrun = 0;
+ pin->timer_sum_overrun = 0;
+ pin->rx_start_bit_low_too_short_cnt = 0;
+ pin->rx_start_bit_too_short_cnt = 0;
+ pin->rx_start_bit_too_long_cnt = 0;
+ pin->rx_data_bit_too_short_cnt = 0;
+ pin->rx_data_bit_too_long_cnt = 0;
+ pin->rx_low_drive_cnt = 0;
+ pin->tx_low_drive_cnt = 0;
+ if (pin->ops->status)
+ pin->ops->status(adap, file);
+}
+
+static int cec_pin_adap_monitor_all_enable(struct cec_adapter *adap,
+ bool enable)
+{
+ struct cec_pin *pin = adap->pin;
+
+ pin->monitor_all = enable;
+ return 0;
+}
+
+static void cec_pin_adap_free(struct cec_adapter *adap)
+{
+ struct cec_pin *pin = adap->pin;
+
+ if (pin->ops->free)
+ pin->ops->free(adap);
+ adap->pin = NULL;
+ kfree(pin);
+}
+
+static int cec_pin_received(struct cec_adapter *adap, struct cec_msg *msg)
+{
+ struct cec_pin *pin = adap->pin;
+
+ if (pin->ops->received)
+ return pin->ops->received(adap, msg);
+ return -ENOMSG;
+}
+
+void cec_pin_changed(struct cec_adapter *adap, bool value)
+{
+ struct cec_pin *pin = adap->pin;
+
+ cec_pin_update(pin, value, false);
+ if (!value && (adap->is_configuring || adap->is_configured ||
+ adap->monitor_all_cnt))
+ atomic_set(&pin->work_irq_change, CEC_PIN_IRQ_DISABLE);
+}
+EXPORT_SYMBOL_GPL(cec_pin_changed);
+
+static const struct cec_adap_ops cec_pin_adap_ops = {
+ .adap_enable = cec_pin_adap_enable,
+ .adap_monitor_all_enable = cec_pin_adap_monitor_all_enable,
+ .adap_log_addr = cec_pin_adap_log_addr,
+ .adap_transmit = cec_pin_adap_transmit,
+ .adap_status = cec_pin_adap_status,
+ .adap_free = cec_pin_adap_free,
+#ifdef CONFIG_CEC_PIN_ERROR_INJ
+ .error_inj_parse_line = cec_pin_error_inj_parse_line,
+ .error_inj_show = cec_pin_error_inj_show,
+#endif
+ .received = cec_pin_received,
+};
+
+struct cec_adapter *cec_pin_allocate_adapter(const struct cec_pin_ops *pin_ops,
+ void *priv, const char *name, u32 caps)
+{
+ struct cec_adapter *adap;
+ struct cec_pin *pin = kzalloc(sizeof(*pin), GFP_KERNEL);
+
+ if (pin == NULL)
+ return ERR_PTR(-ENOMEM);
+ pin->ops = pin_ops;
+ hrtimer_init(&pin->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ pin->timer.function = cec_pin_timer;
+ init_waitqueue_head(&pin->kthread_waitq);
+ pin->tx_custom_low_usecs = CEC_TIM_CUSTOM_DEFAULT;
+ pin->tx_custom_high_usecs = CEC_TIM_CUSTOM_DEFAULT;
+
+ adap = cec_allocate_adapter(&cec_pin_adap_ops, priv, name,
+ caps | CEC_CAP_MONITOR_ALL | CEC_CAP_MONITOR_PIN,
+ CEC_MAX_LOG_ADDRS);
+
+ if (IS_ERR(adap)) {
+ kfree(pin);
+ return adap;
+ }
+
+ adap->pin = pin;
+ pin->adap = adap;
+ cec_pin_update(pin, cec_pin_high(pin), true);
+ return adap;
+}
+EXPORT_SYMBOL_GPL(cec_pin_allocate_adapter);
--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * cec-priv.h - HDMI Consumer Electronics Control internal header
+ *
+ * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#ifndef _CEC_PRIV_H
+#define _CEC_PRIV_H
+
+#include <linux/cec-funcs.h>
+#include <media/cec-notifier.h>
+
+#define dprintk(lvl, fmt, arg...) \
+ do { \
+ if (lvl <= cec_debug) \
+ pr_info("cec-%s: " fmt, adap->name, ## arg); \
+ } while (0)
+
+/* devnode to cec_adapter */
+#define to_cec_adapter(node) container_of(node, struct cec_adapter, devnode)
+
+static inline bool msg_is_raw(const struct cec_msg *msg)
+{
+ return msg->flags & CEC_MSG_FL_RAW;
+}
+
+/* cec-core.c */
+extern int cec_debug;
+int cec_get_device(struct cec_devnode *devnode);
+void cec_put_device(struct cec_devnode *devnode);
+
+/* cec-adap.c */
+int cec_monitor_all_cnt_inc(struct cec_adapter *adap);
+void cec_monitor_all_cnt_dec(struct cec_adapter *adap);
+int cec_monitor_pin_cnt_inc(struct cec_adapter *adap);
+void cec_monitor_pin_cnt_dec(struct cec_adapter *adap);
+int cec_adap_status(struct seq_file *file, void *priv);
+int cec_thread_func(void *_adap);
+void __cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block);
+int __cec_s_log_addrs(struct cec_adapter *adap,
+ struct cec_log_addrs *log_addrs, bool block);
+int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
+ struct cec_fh *fh, bool block);
+void cec_queue_event_fh(struct cec_fh *fh,
+ const struct cec_event *new_ev, u64 ts);
+
+/* cec-api.c */
+extern const struct file_operations cec_devnode_fops;
+
+#endif
projects / linux.git / commitdiff