--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2023 Thomas Weißschuh <linux@weissschuh.net>
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/hwmon.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/types.h>
+#include <linux/usb.h>
+
+#define DRIVER_NAME "powerz"
+#define POWERZ_EP_CMD_OUT 0x01
+#define POWERZ_EP_DATA_IN 0x81
+
+struct powerz_sensor_data {
+ u8 _unknown_1[8];
+ __le32 V_bus;
+ __le32 I_bus;
+ __le32 V_bus_avg;
+ __le32 I_bus_avg;
+ u8 _unknown_2[8];
+ u8 temp[2];
+ __le16 V_cc1;
+ __le16 V_cc2;
+ __le16 V_dp;
+ __le16 V_dm;
+ __le16 V_dd;
+ u8 _unknown_3[4];
+} __packed;
+
+struct powerz_priv {
+ char transfer_buffer[64]; /* first member to satisfy DMA alignment */
+ struct mutex mutex;
+ struct completion completion;
+ struct urb *urb;
+ int status;
+};
+
+static const struct hwmon_channel_info *const powerz_info[] = {
+ HWMON_CHANNEL_INFO(in,
+ HWMON_I_INPUT | HWMON_I_LABEL | HWMON_I_AVERAGE,
+ HWMON_I_INPUT | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_LABEL),
+ HWMON_CHANNEL_INFO(curr,
+ HWMON_C_INPUT | HWMON_C_LABEL | HWMON_C_AVERAGE),
+ HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_LABEL),
+ NULL
+};
+
+static umode_t powerz_is_visible(const void *data, enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ return 0444;
+}
+
+static int powerz_read_string(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, const char **str)
+{
+ if (type == hwmon_curr && attr == hwmon_curr_label) {
+ *str = "IBUS";
+ } else if (type == hwmon_in && attr == hwmon_in_label) {
+ if (channel == 0)
+ *str = "VBUS";
+ else if (channel == 1)
+ *str = "VCC1";
+ else if (channel == 2)
+ *str = "VCC2";
+ else if (channel == 3)
+ *str = "VDP";
+ else if (channel == 4)
+ *str = "VDM";
+ else if (channel == 5)
+ *str = "VDD";
+ else
+ return -EOPNOTSUPP;
+ } else if (type == hwmon_temp && attr == hwmon_temp_label) {
+ *str = "TEMP";
+ } else {
+ return -EOPNOTSUPP;
+ }
+
+ return 0;
+}
+
+static void powerz_usb_data_complete(struct urb *urb)
+{
+ struct powerz_priv *priv = urb->context;
+
+ complete(&priv->completion);
+}
+
+static void powerz_usb_cmd_complete(struct urb *urb)
+{
+ struct powerz_priv *priv = urb->context;
+
+ usb_fill_bulk_urb(urb, urb->dev,
+ usb_rcvbulkpipe(urb->dev, POWERZ_EP_DATA_IN),
+ priv->transfer_buffer, sizeof(priv->transfer_buffer),
+ powerz_usb_data_complete, priv);
+
+ priv->status = usb_submit_urb(urb, GFP_ATOMIC);
+ if (priv->status)
+ complete(&priv->completion);
+}
+
+static int powerz_read_data(struct usb_device *udev, struct powerz_priv *priv)
+{
+ int ret;
+
+ priv->status = -ETIMEDOUT;
+ reinit_completion(&priv->completion);
+
+ priv->transfer_buffer[0] = 0x0c;
+ priv->transfer_buffer[1] = 0x00;
+ priv->transfer_buffer[2] = 0x02;
+ priv->transfer_buffer[3] = 0x00;
+
+ usb_fill_bulk_urb(priv->urb, udev,
+ usb_sndbulkpipe(udev, POWERZ_EP_CMD_OUT),
+ priv->transfer_buffer, 4, powerz_usb_cmd_complete,
+ priv);
+ ret = usb_submit_urb(priv->urb, GFP_KERNEL);
+ if (ret)
+ return ret;
+
+ if (!wait_for_completion_interruptible_timeout
+ (&priv->completion, msecs_to_jiffies(5))) {
+ usb_kill_urb(priv->urb);
+ return -EIO;
+ }
+
+ if (priv->urb->actual_length < sizeof(struct powerz_sensor_data))
+ return -EIO;
+
+ return priv->status;
+}
+
+static int powerz_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ struct usb_interface *intf = to_usb_interface(dev->parent);
+ struct usb_device *udev = interface_to_usbdev(intf);
+ struct powerz_priv *priv = usb_get_intfdata(intf);
+ struct powerz_sensor_data *data;
+ int ret;
+
+ if (!priv)
+ return -EIO; /* disconnected */
+
+ mutex_lock(&priv->mutex);
+ ret = powerz_read_data(udev, priv);
+ if (ret)
+ goto out;
+
+ data = (struct powerz_sensor_data *)priv->transfer_buffer;
+
+ if (type == hwmon_curr) {
+ if (attr == hwmon_curr_input)
+ *val = ((s32)le32_to_cpu(data->I_bus)) / 1000;
+ else if (attr == hwmon_curr_average)
+ *val = ((s32)le32_to_cpu(data->I_bus_avg)) / 1000;
+ else
+ ret = -EOPNOTSUPP;
+ } else if (type == hwmon_in) {
+ if (attr == hwmon_in_input) {
+ if (channel == 0)
+ *val = le32_to_cpu(data->V_bus) / 1000;
+ else if (channel == 1)
+ *val = le16_to_cpu(data->V_cc1) / 10;
+ else if (channel == 2)
+ *val = le16_to_cpu(data->V_cc2) / 10;
+ else if (channel == 3)
+ *val = le16_to_cpu(data->V_dp) / 10;
+ else if (channel == 4)
+ *val = le16_to_cpu(data->V_dm) / 10;
+ else if (channel == 5)
+ *val = le16_to_cpu(data->V_dd) / 10;
+ else
+ ret = -EOPNOTSUPP;
+ } else if (attr == hwmon_in_average && channel == 0) {
+ *val = le32_to_cpu(data->V_bus_avg) / 1000;
+ } else {
+ ret = -EOPNOTSUPP;
+ }
+ } else if (type == hwmon_temp && attr == hwmon_temp_input) {
+ *val = data->temp[1] * 2000 + data->temp[0] * 1000 / 128;
+ } else {
+ ret = -EOPNOTSUPP;
+ }
+
+out:
+ mutex_unlock(&priv->mutex);
+ return ret;
+}
+
+static const struct hwmon_ops powerz_hwmon_ops = {
+ .is_visible = powerz_is_visible,
+ .read = powerz_read,
+ .read_string = powerz_read_string,
+};
+
+static const struct hwmon_chip_info powerz_chip_info = {
+ .ops = &powerz_hwmon_ops,
+ .info = powerz_info,
+};
+
+static int powerz_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+ struct powerz_priv *priv;
+ struct device *hwmon_dev;
+ struct device *parent;
+
+ parent = &intf->dev;
+
+ priv = devm_kzalloc(parent, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!priv->urb)
+ return -ENOMEM;
+ mutex_init(&priv->mutex);
+ init_completion(&priv->completion);
+
+ hwmon_dev =
+ devm_hwmon_device_register_with_info(parent, DRIVER_NAME, priv,
+ &powerz_chip_info, NULL);
+ if (IS_ERR(hwmon_dev)) {
+ usb_free_urb(priv->urb);
+ return PTR_ERR(hwmon_dev);
+ }
+
+ usb_set_intfdata(intf, priv);
+
+ return 0;
+}
+
+static void powerz_disconnect(struct usb_interface *intf)
+{
+ struct powerz_priv *priv = usb_get_intfdata(intf);
+
+ mutex_lock(&priv->mutex);
+ usb_kill_urb(priv->urb);
+ usb_free_urb(priv->urb);
+ mutex_unlock(&priv->mutex);
+}
+
+static const struct usb_device_id powerz_id_table[] = {
+ { USB_DEVICE_INTERFACE_NUMBER(0x5FC9, 0x0063, 0x00) }, /* ChargerLAB POWER-Z KM003C */
+ { }
+};
+
+MODULE_DEVICE_TABLE(usb, powerz_id_table);
+
+static struct usb_driver powerz_driver = {
+ .name = DRIVER_NAME,
+ .id_table = powerz_id_table,
+ .probe = powerz_probe,
+ .disconnect = powerz_disconnect,
+};
+
+module_usb_driver(powerz_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Thomas Weißschuh <linux@weissschuh.net>");
+MODULE_DESCRIPTION("ChargerLAB POWER-Z USB-C tester");
projects / linux.git / commitdiff