--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * HID Sensors Driver
+ * Copyright (c) 2020, Intel Corporation.
+ */
+#include <linux/hid-sensor-hub.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/iio.h>
+#include <linux/platform_device.h>
+
+#include "../common/hid-sensors/hid-sensor-trigger.h"
+
+enum hinge_channel {
+ CHANNEL_SCAN_INDEX_HINGE_ANGLE,
+ CHANNEL_SCAN_INDEX_SCREEN_ANGLE,
+ CHANNEL_SCAN_INDEX_KEYBOARD_ANGLE,
+ CHANNEL_SCAN_INDEX_MAX,
+};
+
+#define CHANNEL_SCAN_INDEX_TIMESTAMP CHANNEL_SCAN_INDEX_MAX
+
+static const u32 hinge_addresses[CHANNEL_SCAN_INDEX_MAX] = {
+ HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(1),
+ HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(2),
+ HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(3)
+};
+
+static const char *const hinge_labels[CHANNEL_SCAN_INDEX_MAX] = { "hinge",
+ "screen",
+ "keyboard" };
+
+struct hinge_state {
+ struct iio_dev *indio_dev;
+ struct hid_sensor_hub_attribute_info hinge[CHANNEL_SCAN_INDEX_MAX];
+ struct hid_sensor_hub_callbacks callbacks;
+ struct hid_sensor_common common_attributes;
+ const char *labels[CHANNEL_SCAN_INDEX_MAX];
+ struct {
+ u32 hinge_val[3];
+ u64 timestamp __aligned(8);
+ } scan;
+
+ int scale_pre_decml;
+ int scale_post_decml;
+ int scale_precision;
+ int value_offset;
+ u64 timestamp;
+};
+
+/* Channel definitions */
+static const struct iio_chan_spec hinge_channels[] = {
+ {
+ .type = IIO_ANGL,
+ .indexed = 1,
+ .channel = 0,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type =
+ BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_SAMP_FREQ) | BIT(IIO_CHAN_INFO_HYSTERESIS),
+ .scan_index = CHANNEL_SCAN_INDEX_HINGE_ANGLE,
+ .scan_type = {
+ .sign = 's',
+ .storagebits = 32,
+ },
+ }, {
+ .type = IIO_ANGL,
+ .indexed = 1,
+ .channel = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type =
+ BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_SAMP_FREQ) | BIT(IIO_CHAN_INFO_HYSTERESIS),
+ .scan_index = CHANNEL_SCAN_INDEX_SCREEN_ANGLE,
+ .scan_type = {
+ .sign = 's',
+ .storagebits = 32,
+ },
+ }, {
+ .type = IIO_ANGL,
+ .indexed = 1,
+ .channel = 2,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type =
+ BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_SAMP_FREQ) | BIT(IIO_CHAN_INFO_HYSTERESIS),
+ .scan_index = CHANNEL_SCAN_INDEX_KEYBOARD_ANGLE,
+ .scan_type = {
+ .sign = 's',
+ .storagebits = 32,
+ },
+ },
+ IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP)
+};
+
+/* Adjust channel real bits based on report descriptor */
+static void hinge_adjust_channel_realbits(struct iio_chan_spec *channels,
+ int channel, int size)
+{
+ channels[channel].scan_type.realbits = size * 8;
+}
+
+/* Channel read_raw handler */
+static int hinge_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val, int *val2,
+ long mask)
+{
+ struct hinge_state *st = iio_priv(indio_dev);
+ struct hid_sensor_hub_device *hsdev;
+ int report_id;
+ s32 min;
+
+ hsdev = st->common_attributes.hsdev;
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ hid_sensor_power_state(&st->common_attributes, true);
+ report_id = st->hinge[chan->scan_index].report_id;
+ min = st->hinge[chan->scan_index].logical_minimum;
+ if (report_id < 0) {
+ hid_sensor_power_state(&st->common_attributes, false);
+ return -EINVAL;
+ }
+
+ *val = sensor_hub_input_attr_get_raw_value(st->common_attributes.hsdev,
+ hsdev->usage,
+ hinge_addresses[chan->scan_index],
+ report_id,
+ SENSOR_HUB_SYNC, min < 0);
+
+ hid_sensor_power_state(&st->common_attributes, false);
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ *val = st->scale_pre_decml;
+ *val2 = st->scale_post_decml;
+ return st->scale_precision;
+ case IIO_CHAN_INFO_OFFSET:
+ *val = st->value_offset;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ return hid_sensor_read_samp_freq_value(&st->common_attributes,
+ val, val2);
+ case IIO_CHAN_INFO_HYSTERESIS:
+ return hid_sensor_read_raw_hyst_value(&st->common_attributes,
+ val, val2);
+ default:
+ return -EINVAL;
+ }
+}
+
+/* Channel write_raw handler */
+static int hinge_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int val, int val2,
+ long mask)
+{
+ struct hinge_state *st = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ return hid_sensor_write_samp_freq_value(&st->common_attributes,
+ val, val2);
+ case IIO_CHAN_INFO_HYSTERESIS:
+ return hid_sensor_write_raw_hyst_value(&st->common_attributes,
+ val, val2);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int hinge_read_label(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, char *label)
+{
+ struct hinge_state *st = iio_priv(indio_dev);
+
+ return sprintf(label, "%s\n", st->labels[chan->channel]);
+}
+
+static const struct iio_info hinge_info = {
+ .read_raw = hinge_read_raw,
+ .write_raw = hinge_write_raw,
+ .read_label = hinge_read_label,
+};
+
+/*
+ * Callback handler to send event after all samples are received
+ * and captured.
+ */
+static int hinge_proc_event(struct hid_sensor_hub_device *hsdev,
+ unsigned int usage_id, void *priv)
+{
+ struct iio_dev *indio_dev = platform_get_drvdata(priv);
+ struct hinge_state *st = iio_priv(indio_dev);
+
+ if (atomic_read(&st->common_attributes.data_ready)) {
+ if (!st->timestamp)
+ st->timestamp = iio_get_time_ns(indio_dev);
+
+ iio_push_to_buffers_with_timestamp(indio_dev, &st->scan,
+ st->timestamp);
+
+ st->timestamp = 0;
+ }
+ return 0;
+}
+
+/* Capture samples in local storage */
+static int hinge_capture_sample(struct hid_sensor_hub_device *hsdev,
+ unsigned int usage_id, size_t raw_len,
+ char *raw_data, void *priv)
+{
+ struct iio_dev *indio_dev = platform_get_drvdata(priv);
+ struct hinge_state *st = iio_priv(indio_dev);
+ int offset;
+
+ switch (usage_id) {
+ case HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(1):
+ case HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(2):
+ case HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(3):
+ offset = usage_id - HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(1);
+ st->scan.hinge_val[offset] = *(u32 *)raw_data;
+ return 0;
+ case HID_USAGE_SENSOR_TIME_TIMESTAMP:
+ st->timestamp = hid_sensor_convert_timestamp(&st->common_attributes,
+ *(int64_t *)raw_data);
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+/* Parse report which is specific to an usage id */
+static int hinge_parse_report(struct platform_device *pdev,
+ struct hid_sensor_hub_device *hsdev,
+ struct iio_chan_spec *channels,
+ unsigned int usage_id, struct hinge_state *st)
+{
+ int ret;
+ int i;
+
+ for (i = 0; i < CHANNEL_SCAN_INDEX_MAX; ++i) {
+ ret = sensor_hub_input_get_attribute_info(hsdev,
+ HID_INPUT_REPORT,
+ usage_id,
+ hinge_addresses[i],
+ &st->hinge[i]);
+ if (ret < 0)
+ return ret;
+
+ hinge_adjust_channel_realbits(channels, i, st->hinge[i].size);
+ }
+
+ st->scale_precision = hid_sensor_format_scale(HID_USAGE_SENSOR_HINGE,
+ &st->hinge[CHANNEL_SCAN_INDEX_HINGE_ANGLE],
+ &st->scale_pre_decml, &st->scale_post_decml);
+
+ /* Set Sensitivity field ids, when there is no individual modifier */
+ if (st->common_attributes.sensitivity.index < 0) {
+ sensor_hub_input_get_attribute_info(hsdev,
+ HID_FEATURE_REPORT, usage_id,
+ HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
+ HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(1),
+ &st->common_attributes.sensitivity);
+ dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
+ st->common_attributes.sensitivity.index,
+ st->common_attributes.sensitivity.report_id);
+ }
+
+ return ret;
+}
+
+/* Function to initialize the processing for usage id */
+static int hid_hinge_probe(struct platform_device *pdev)
+{
+ struct hinge_state *st;
+ struct iio_dev *indio_dev;
+ struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
+ int ret;
+ int i;
+
+ indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*st));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, indio_dev);
+
+ st = iio_priv(indio_dev);
+ st->common_attributes.hsdev = hsdev;
+ st->common_attributes.pdev = pdev;
+ st->indio_dev = indio_dev;
+ for (i = 0; i < CHANNEL_SCAN_INDEX_MAX; i++)
+ st->labels[i] = hinge_labels[i];
+
+ ret = hid_sensor_parse_common_attributes(hsdev, hsdev->usage,
+ &st->common_attributes);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to setup common attributes\n");
+ return ret;
+ }
+
+ indio_dev->num_channels = ARRAY_SIZE(hinge_channels);
+ indio_dev->channels = devm_kmemdup(&indio_dev->dev, hinge_channels,
+ sizeof(hinge_channels), GFP_KERNEL);
+ if (!indio_dev->channels)
+ return -ENOMEM;
+
+ ret = hinge_parse_report(pdev, hsdev,
+ (struct iio_chan_spec *)indio_dev->channels,
+ hsdev->usage, st);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to setup attributes\n");
+ return ret;
+ }
+
+ indio_dev->dev.parent = &pdev->dev;
+ indio_dev->info = &hinge_info;
+ indio_dev->name = "hinge";
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ atomic_set(&st->common_attributes.data_ready, 0);
+ ret = hid_sensor_setup_trigger(indio_dev, indio_dev->name,
+ &st->common_attributes);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "trigger setup failed\n");
+ return ret;
+ }
+
+ st->callbacks.send_event = hinge_proc_event;
+ st->callbacks.capture_sample = hinge_capture_sample;
+ st->callbacks.pdev = pdev;
+ ret = sensor_hub_register_callback(hsdev, hsdev->usage, &st->callbacks);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "callback reg failed\n");
+ goto error_remove_trigger;
+ }
+
+ ret = iio_device_register(indio_dev);
+ if (ret) {
+ dev_err(&pdev->dev, "device register failed\n");
+ goto error_remove_callback;
+ }
+
+ return ret;
+
+error_remove_callback:
+ sensor_hub_remove_callback(hsdev, hsdev->usage);
+error_remove_trigger:
+ hid_sensor_remove_trigger(indio_dev, &st->common_attributes);
+ return ret;
+}
+
+/* Function to deinitialize the processing for usage id */
+static int hid_hinge_remove(struct platform_device *pdev)
+{
+ struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
+ struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+ struct hinge_state *st = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+ sensor_hub_remove_callback(hsdev, hsdev->usage);
+ hid_sensor_remove_trigger(indio_dev, &st->common_attributes);
+
+ return 0;
+}
+
+static const struct platform_device_id hid_hinge_ids[] = {
+ {
+ /* Format: HID-SENSOR-INT-usage_id_in_hex_lowercase */
+ .name = "HID-SENSOR-INT-020b",
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, hid_hinge_ids);
+
+static struct platform_driver hid_hinge_platform_driver = {
+ .id_table = hid_hinge_ids,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .pm = &hid_sensor_pm_ops,
+ },
+ .probe = hid_hinge_probe,
+ .remove = hid_hinge_remove,
+};
+module_platform_driver(hid_hinge_platform_driver);
+
+MODULE_DESCRIPTION("HID Sensor INTEL Hinge");
+MODULE_AUTHOR("Ye Xiang <xiang.ye@intel.com>");
+MODULE_LICENSE("GPL");
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