drivers/iio/position/hid-sensor-custom-intel-hinge.c - linux - Git at Google

 // 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");
	// 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");