[linux-block.git] / drivers / iio / orientation / hid-sensor-rotation.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * HID Sensors Driver
 * Copyright (c) 2014, Intel Corporation.
 */

#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/hid-sensor-hub.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include "../common/hid-sensors/hid-sensor-trigger.h"

struct dev_rot_state {
	struct hid_sensor_hub_callbacks callbacks;
	struct hid_sensor_common common_attributes;
	struct hid_sensor_hub_attribute_info quaternion;
	struct {
		s32 sampled_vals[4];
		aligned_s64 timestamp;
	} scan;
	int scale_pre_decml;
	int scale_post_decml;
	int scale_precision;
	int value_offset;
	s64 timestamp;
};

static const u32 rotation_sensitivity_addresses[] = {
	HID_USAGE_SENSOR_DATA_ORIENTATION,
	HID_USAGE_SENSOR_ORIENT_QUATERNION,
};

/* Channel definitions */
static const struct iio_chan_spec dev_rot_channels[] = {
	{
		.type = IIO_ROT,
		.modified = 1,
		.channel2 = IIO_MOD_QUATERNION,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
					BIT(IIO_CHAN_INFO_OFFSET) |
					BIT(IIO_CHAN_INFO_SCALE) |
					BIT(IIO_CHAN_INFO_HYSTERESIS),
		.scan_index = 0
	},
	IIO_CHAN_SOFT_TIMESTAMP(1)
};

/* Adjust channel real bits based on report descriptor */
static void dev_rot_adjust_channel_bit_mask(struct iio_chan_spec *chan,
						int size)
{
	chan->scan_type.sign = 's';
	/* Real storage bits will change based on the report desc. */
	chan->scan_type.realbits = size * 8;
	/* Maximum size of a sample to capture is u32 */
	chan->scan_type.storagebits = sizeof(u32) * 8;
	chan->scan_type.repeat = 4;
}

/* Channel read_raw handler */
static int dev_rot_read_raw(struct iio_dev *indio_dev,
				struct iio_chan_spec const *chan,
				int size, int *vals, int *val_len,
				long mask)
{
	struct dev_rot_state *rot_state = iio_priv(indio_dev);
	int ret_type;
	int i;

	vals[0] = 0;
	vals[1] = 0;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		if (size >= 4) {
			for (i = 0; i < 4; ++i)
				vals[i] = rot_state->scan.sampled_vals[i];
			ret_type = IIO_VAL_INT_MULTIPLE;
			*val_len =  4;
		} else
			ret_type = -EINVAL;
		break;
	case IIO_CHAN_INFO_SCALE:
		vals[0] = rot_state->scale_pre_decml;
		vals[1] = rot_state->scale_post_decml;
		return rot_state->scale_precision;

	case IIO_CHAN_INFO_OFFSET:
		*vals = rot_state->value_offset;
		return IIO_VAL_INT;

	case IIO_CHAN_INFO_SAMP_FREQ:
		ret_type = hid_sensor_read_samp_freq_value(
			&rot_state->common_attributes, &vals[0], &vals[1]);
		break;
	case IIO_CHAN_INFO_HYSTERESIS:
		ret_type = hid_sensor_read_raw_hyst_value(
			&rot_state->common_attributes, &vals[0], &vals[1]);
		break;
	default:
		ret_type = -EINVAL;
		break;
	}

	return ret_type;
}

/* Channel write_raw handler */
static int dev_rot_write_raw(struct iio_dev *indio_dev,
			       struct iio_chan_spec const *chan,
			       int val,
			       int val2,
			       long mask)
{
	struct dev_rot_state *rot_state = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_SAMP_FREQ:
		ret = hid_sensor_write_samp_freq_value(
				&rot_state->common_attributes, val, val2);
		break;
	case IIO_CHAN_INFO_HYSTERESIS:
		ret = hid_sensor_write_raw_hyst_value(
				&rot_state->common_attributes, val, val2);
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static const struct iio_info dev_rot_info = {
	.read_raw_multi = &dev_rot_read_raw,
	.write_raw = &dev_rot_write_raw,
};

/* Callback handler to send event after all samples are received and captured */
static int dev_rot_proc_event(struct hid_sensor_hub_device *hsdev,
				unsigned usage_id,
				void *priv)
{
	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	struct dev_rot_state *rot_state = iio_priv(indio_dev);

	dev_dbg(&indio_dev->dev, "dev_rot_proc_event\n");
	if (atomic_read(&rot_state->common_attributes.data_ready)) {
		if (!rot_state->timestamp)
			rot_state->timestamp = iio_get_time_ns(indio_dev);

		iio_push_to_buffers_with_timestamp(indio_dev, &rot_state->scan,
						   rot_state->timestamp);

		rot_state->timestamp = 0;
	}

	return 0;
}

/* Capture samples in local storage */
static int dev_rot_capture_sample(struct hid_sensor_hub_device *hsdev,
				unsigned usage_id,
				size_t raw_len, char *raw_data,
				void *priv)
{
	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	struct dev_rot_state *rot_state = iio_priv(indio_dev);

	if (usage_id == HID_USAGE_SENSOR_ORIENT_QUATERNION) {
		if (raw_len / 4 == sizeof(s16)) {
			rot_state->scan.sampled_vals[0] = ((s16 *)raw_data)[0];
			rot_state->scan.sampled_vals[1] = ((s16 *)raw_data)[1];
			rot_state->scan.sampled_vals[2] = ((s16 *)raw_data)[2];
			rot_state->scan.sampled_vals[3] = ((s16 *)raw_data)[3];
		} else {
			memcpy(&rot_state->scan.sampled_vals, raw_data,
			       sizeof(rot_state->scan.sampled_vals));
		}

		dev_dbg(&indio_dev->dev, "Recd Quat len:%zu::%zu\n", raw_len,
			sizeof(rot_state->scan.sampled_vals));
	} else if (usage_id == HID_USAGE_SENSOR_TIME_TIMESTAMP) {
		rot_state->timestamp = hid_sensor_convert_timestamp(&rot_state->common_attributes,
								    *(s64 *)raw_data);
	}

	return 0;
}

/* Parse report which is specific to an usage id*/
static int dev_rot_parse_report(struct platform_device *pdev,
				struct hid_sensor_hub_device *hsdev,
				struct iio_chan_spec *channels,
				unsigned usage_id,
				struct dev_rot_state *st)
{
	int ret;

	ret = sensor_hub_input_get_attribute_info(hsdev,
				HID_INPUT_REPORT,
				usage_id,
				HID_USAGE_SENSOR_ORIENT_QUATERNION,
				&st->quaternion);
	if (ret)
		return ret;

	dev_rot_adjust_channel_bit_mask(&channels[0],
		st->quaternion.size / 4);

	dev_dbg(&pdev->dev, "dev_rot %x:%x\n", st->quaternion.index,
		st->quaternion.report_id);

	dev_dbg(&pdev->dev, "dev_rot: attrib size %d\n",
				st->quaternion.size);

	st->scale_precision = hid_sensor_format_scale(
				hsdev->usage,
				&st->quaternion,
				&st->scale_pre_decml, &st->scale_post_decml);

	return 0;
}

/* Function to initialize the processing for usage id */
static int hid_dev_rot_probe(struct platform_device *pdev)
{
	struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
	int ret;
	char *name;
	struct iio_dev *indio_dev;
	struct dev_rot_state *rot_state;

	indio_dev = devm_iio_device_alloc(&pdev->dev,
					  sizeof(struct dev_rot_state));
	if (indio_dev == NULL)
		return -ENOMEM;

	platform_set_drvdata(pdev, indio_dev);

	rot_state = iio_priv(indio_dev);
	rot_state->common_attributes.hsdev = hsdev;
	rot_state->common_attributes.pdev = pdev;

	switch (hsdev->usage) {
	case HID_USAGE_SENSOR_DEVICE_ORIENTATION:
		name = "dev_rotation";
		break;
	case HID_USAGE_SENSOR_RELATIVE_ORIENTATION:
		name = "relative_orientation";
		break;
	case HID_USAGE_SENSOR_GEOMAGNETIC_ORIENTATION:
		name = "geomagnetic_orientation";
		break;
	default:
		return -EINVAL;
	}

	ret = hid_sensor_parse_common_attributes(hsdev,
						 hsdev->usage,
						 &rot_state->common_attributes,
						 rotation_sensitivity_addresses,
						 ARRAY_SIZE(rotation_sensitivity_addresses));
	if (ret) {
		dev_err(&pdev->dev, "failed to setup common attributes\n");
		return ret;
	}

	indio_dev->channels = devm_kmemdup(&pdev->dev, dev_rot_channels,
					   sizeof(dev_rot_channels),
					   GFP_KERNEL);
	if (!indio_dev->channels) {
		dev_err(&pdev->dev, "failed to duplicate channels\n");
		return -ENOMEM;
	}

	ret = dev_rot_parse_report(pdev, hsdev,
				   (struct iio_chan_spec *)indio_dev->channels,
					hsdev->usage, rot_state);
	if (ret) {
		dev_err(&pdev->dev, "failed to setup attributes\n");
		return ret;
	}

	indio_dev->num_channels = ARRAY_SIZE(dev_rot_channels);
	indio_dev->info = &dev_rot_info;
	indio_dev->name = name;
	indio_dev->modes = INDIO_DIRECT_MODE;

	atomic_set(&rot_state->common_attributes.data_ready, 0);

	ret = hid_sensor_setup_trigger(indio_dev, name,
					&rot_state->common_attributes);
	if (ret) {
		dev_err(&pdev->dev, "trigger setup failed\n");
		return ret;
	}

	ret = iio_device_register(indio_dev);
	if (ret) {
		dev_err(&pdev->dev, "device register failed\n");
		goto error_remove_trigger;
	}

	rot_state->callbacks.send_event = dev_rot_proc_event;
	rot_state->callbacks.capture_sample = dev_rot_capture_sample;
	rot_state->callbacks.pdev = pdev;
	ret = sensor_hub_register_callback(hsdev, hsdev->usage,
					&rot_state->callbacks);
	if (ret) {
		dev_err(&pdev->dev, "callback reg failed\n");
		goto error_iio_unreg;
	}

	return 0;

error_iio_unreg:
	iio_device_unregister(indio_dev);
error_remove_trigger:
	hid_sensor_remove_trigger(indio_dev, &rot_state->common_attributes);
	return ret;
}

/* Function to deinitialize the processing for usage id */
static void hid_dev_rot_remove(struct platform_device *pdev)
{
	struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
	struct dev_rot_state *rot_state = iio_priv(indio_dev);

	sensor_hub_remove_callback(hsdev, hsdev->usage);
	iio_device_unregister(indio_dev);
	hid_sensor_remove_trigger(indio_dev, &rot_state->common_attributes);
}

static const struct platform_device_id hid_dev_rot_ids[] = {
	{
		/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
		.name = "HID-SENSOR-20008a",
	},
	{
		/* Relative orientation(AG) sensor */
		.name = "HID-SENSOR-20008e",
	},
	{
		/* Geomagnetic orientation(AM) sensor */
		.name = "HID-SENSOR-2000c1",
	},
	{ }
};
MODULE_DEVICE_TABLE(platform, hid_dev_rot_ids);

static struct platform_driver hid_dev_rot_platform_driver = {
	.id_table = hid_dev_rot_ids,
	.driver = {
		.name	= KBUILD_MODNAME,
		.pm     = &hid_sensor_pm_ops,
	},
	.probe		= hid_dev_rot_probe,
	.remove		= hid_dev_rot_remove,
};
module_platform_driver(hid_dev_rot_platform_driver);

MODULE_DESCRIPTION("HID Sensor Device Rotation");
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("IIO_HID");
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0-only
	2	/*
	3	* HID Sensors Driver
	4	* Copyright (c) 2014, Intel Corporation.
	5	*/
	6
	7	#include <linux/device.h>
	8	#include <linux/platform_device.h>
	9	#include <linux/module.h>
	10	#include <linux/mod_devicetable.h>
	11	#include <linux/hid-sensor-hub.h>
	12	#include <linux/iio/iio.h>
	13	#include <linux/iio/sysfs.h>
	14	#include <linux/iio/buffer.h>
	15	#include "../common/hid-sensors/hid-sensor-trigger.h"
	16
	17	struct dev_rot_state {
	18	struct hid_sensor_hub_callbacks callbacks;
	19	struct hid_sensor_common common_attributes;
	20	struct hid_sensor_hub_attribute_info quaternion;
	21	struct {
	22	s32 sampled_vals[4];
	23	aligned_s64 timestamp;
	24	} scan;
	25	int scale_pre_decml;
	26	int scale_post_decml;
	27	int scale_precision;
	28	int value_offset;
	29	s64 timestamp;
	30	};
	31
	32	static const u32 rotation_sensitivity_addresses[] = {
	33	HID_USAGE_SENSOR_DATA_ORIENTATION,
	34	HID_USAGE_SENSOR_ORIENT_QUATERNION,
	35	};
	36
	37	/* Channel definitions */
	38	static const struct iio_chan_spec dev_rot_channels[] = {
	39	{
	40	.type = IIO_ROT,
	41	.modified = 1,
	42	.channel2 = IIO_MOD_QUATERNION,
	43	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	44	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) \|
	45	BIT(IIO_CHAN_INFO_OFFSET) \|
	46	BIT(IIO_CHAN_INFO_SCALE) \|
	47	BIT(IIO_CHAN_INFO_HYSTERESIS),
	48	.scan_index = 0
	49	},
	50	IIO_CHAN_SOFT_TIMESTAMP(1)
	51	};
	52
	53	/* Adjust channel real bits based on report descriptor */
	54	static void dev_rot_adjust_channel_bit_mask(struct iio_chan_spec *chan,
	55	int size)
	56	{
	57	chan->scan_type.sign = 's';
	58	/* Real storage bits will change based on the report desc. */
	59	chan->scan_type.realbits = size * 8;
	60	/* Maximum size of a sample to capture is u32 */
	61	chan->scan_type.storagebits = sizeof(u32) * 8;
	62	chan->scan_type.repeat = 4;
	63	}
	64
	65	/* Channel read_raw handler */
	66	static int dev_rot_read_raw(struct iio_dev *indio_dev,
	67	struct iio_chan_spec const *chan,
	68	int size, int vals, int val_len,
	69	long mask)
	70	{
	71	struct dev_rot_state *rot_state = iio_priv(indio_dev);
	72	int ret_type;
	73	int i;
	74
	75	vals[0] = 0;
	76	vals[1] = 0;
	77
	78	switch (mask) {
	79	case IIO_CHAN_INFO_RAW:
	80	if (size >= 4) {
	81	for (i = 0; i < 4; ++i)
	82	vals[i] = rot_state->scan.sampled_vals[i];
	83	ret_type = IIO_VAL_INT_MULTIPLE;
	84	*val_len = 4;
	85	} else
	86	ret_type = -EINVAL;
	87	break;
	88	case IIO_CHAN_INFO_SCALE:
	89	vals[0] = rot_state->scale_pre_decml;
	90	vals[1] = rot_state->scale_post_decml;
	91	return rot_state->scale_precision;
	92
	93	case IIO_CHAN_INFO_OFFSET:
	94	*vals = rot_state->value_offset;
	95	return IIO_VAL_INT;
	96
	97	case IIO_CHAN_INFO_SAMP_FREQ:
	98	ret_type = hid_sensor_read_samp_freq_value(
	99	&rot_state->common_attributes, &vals[0], &vals[1]);
	100	break;
	101	case IIO_CHAN_INFO_HYSTERESIS:
	102	ret_type = hid_sensor_read_raw_hyst_value(
	103	&rot_state->common_attributes, &vals[0], &vals[1]);
	104	break;
	105	default:
	106	ret_type = -EINVAL;
	107	break;
	108	}
	109
	110	return ret_type;
	111	}
	112
	113	/* Channel write_raw handler */
	114	static int dev_rot_write_raw(struct iio_dev *indio_dev,
	115	struct iio_chan_spec const *chan,
	116	int val,
	117	int val2,
	118	long mask)
	119	{
	120	struct dev_rot_state *rot_state = iio_priv(indio_dev);
	121	int ret;
	122
	123	switch (mask) {
	124	case IIO_CHAN_INFO_SAMP_FREQ:
	125	ret = hid_sensor_write_samp_freq_value(
	126	&rot_state->common_attributes, val, val2);
	127	break;
	128	case IIO_CHAN_INFO_HYSTERESIS:
	129	ret = hid_sensor_write_raw_hyst_value(
	130	&rot_state->common_attributes, val, val2);
	131	break;
	132	default:
	133	ret = -EINVAL;
	134	}
	135
	136	return ret;
	137	}
	138
	139	static const struct iio_info dev_rot_info = {
	140	.read_raw_multi = &dev_rot_read_raw,
	141	.write_raw = &dev_rot_write_raw,
	142	};
	143
	144	/* Callback handler to send event after all samples are received and captured */
	145	static int dev_rot_proc_event(struct hid_sensor_hub_device *hsdev,
	146	unsigned usage_id,
	147	void *priv)
	148	{
	149	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	150	struct dev_rot_state *rot_state = iio_priv(indio_dev);
	151
	152	dev_dbg(&indio_dev->dev, "dev_rot_proc_event\n");
	153	if (atomic_read(&rot_state->common_attributes.data_ready)) {
	154	if (!rot_state->timestamp)
	155	rot_state->timestamp = iio_get_time_ns(indio_dev);
	156
	157	iio_push_to_buffers_with_timestamp(indio_dev, &rot_state->scan,
	158	rot_state->timestamp);
	159
	160	rot_state->timestamp = 0;
	161	}
	162
	163	return 0;
	164	}
	165
	166	/* Capture samples in local storage */
	167	static int dev_rot_capture_sample(struct hid_sensor_hub_device *hsdev,
	168	unsigned usage_id,
	169	size_t raw_len, char *raw_data,
	170	void *priv)
	171	{
	172	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	173	struct dev_rot_state *rot_state = iio_priv(indio_dev);
	174
	175	if (usage_id == HID_USAGE_SENSOR_ORIENT_QUATERNION) {
	176	if (raw_len / 4 == sizeof(s16)) {
	177	rot_state->scan.sampled_vals[0] = ((s16 *)raw_data)[0];
	178	rot_state->scan.sampled_vals[1] = ((s16 *)raw_data)[1];
	179	rot_state->scan.sampled_vals[2] = ((s16 *)raw_data)[2];
	180	rot_state->scan.sampled_vals[3] = ((s16 *)raw_data)[3];
	181	} else {
	182	memcpy(&rot_state->scan.sampled_vals, raw_data,
	183	sizeof(rot_state->scan.sampled_vals));
	184	}
	185
	186	dev_dbg(&indio_dev->dev, "Recd Quat len:%zu::%zu\n", raw_len,
	187	sizeof(rot_state->scan.sampled_vals));
	188	} else if (usage_id == HID_USAGE_SENSOR_TIME_TIMESTAMP) {
	189	rot_state->timestamp = hid_sensor_convert_timestamp(&rot_state->common_attributes,
	190	(s64 )raw_data);
	191	}
	192
	193	return 0;
	194	}
	195
	196	/* Parse report which is specific to an usage id*/
	197	static int dev_rot_parse_report(struct platform_device *pdev,
	198	struct hid_sensor_hub_device *hsdev,
	199	struct iio_chan_spec *channels,
	200	unsigned usage_id,
	201	struct dev_rot_state *st)
	202	{
	203	int ret;
	204
	205	ret = sensor_hub_input_get_attribute_info(hsdev,
	206	HID_INPUT_REPORT,
	207	usage_id,
	208	HID_USAGE_SENSOR_ORIENT_QUATERNION,
	209	&st->quaternion);
	210	if (ret)
	211	return ret;
	212
	213	dev_rot_adjust_channel_bit_mask(&channels[0],
	214	st->quaternion.size / 4);
	215
	216	dev_dbg(&pdev->dev, "dev_rot %x:%x\n", st->quaternion.index,
	217	st->quaternion.report_id);
	218
	219	dev_dbg(&pdev->dev, "dev_rot: attrib size %d\n",
	220	st->quaternion.size);
	221
	222	st->scale_precision = hid_sensor_format_scale(
	223	hsdev->usage,
	224	&st->quaternion,
	225	&st->scale_pre_decml, &st->scale_post_decml);
	226
	227	return 0;
	228	}
	229
	230	/* Function to initialize the processing for usage id */
	231	static int hid_dev_rot_probe(struct platform_device *pdev)
	232	{
	233	struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
	234	int ret;
	235	char *name;
	236	struct iio_dev *indio_dev;
	237	struct dev_rot_state *rot_state;
	238
	239	indio_dev = devm_iio_device_alloc(&pdev->dev,
	240	sizeof(struct dev_rot_state));
	241	if (indio_dev == NULL)
	242	return -ENOMEM;
	243
	244	platform_set_drvdata(pdev, indio_dev);
	245
	246	rot_state = iio_priv(indio_dev);
	247	rot_state->common_attributes.hsdev = hsdev;
	248	rot_state->common_attributes.pdev = pdev;
	249
	250	switch (hsdev->usage) {
	251	case HID_USAGE_SENSOR_DEVICE_ORIENTATION:
	252	name = "dev_rotation";
	253	break;
	254	case HID_USAGE_SENSOR_RELATIVE_ORIENTATION:
	255	name = "relative_orientation";
	256	break;
	257	case HID_USAGE_SENSOR_GEOMAGNETIC_ORIENTATION:
	258	name = "geomagnetic_orientation";
	259	break;
	260	default:
	261	return -EINVAL;
	262	}
	263
	264	ret = hid_sensor_parse_common_attributes(hsdev,
	265	hsdev->usage,
	266	&rot_state->common_attributes,
	267	rotation_sensitivity_addresses,
	268	ARRAY_SIZE(rotation_sensitivity_addresses));
	269	if (ret) {
	270	dev_err(&pdev->dev, "failed to setup common attributes\n");
	271	return ret;
	272	}
	273
	274	indio_dev->channels = devm_kmemdup(&pdev->dev, dev_rot_channels,
	275	sizeof(dev_rot_channels),
	276	GFP_KERNEL);
	277	if (!indio_dev->channels) {
	278	dev_err(&pdev->dev, "failed to duplicate channels\n");
	279	return -ENOMEM;
	280	}
	281
	282	ret = dev_rot_parse_report(pdev, hsdev,
	283	(struct iio_chan_spec *)indio_dev->channels,
	284	hsdev->usage, rot_state);
	285	if (ret) {
	286	dev_err(&pdev->dev, "failed to setup attributes\n");
	287	return ret;
	288	}
	289
	290	indio_dev->num_channels = ARRAY_SIZE(dev_rot_channels);
	291	indio_dev->info = &dev_rot_info;
	292	indio_dev->name = name;
	293	indio_dev->modes = INDIO_DIRECT_MODE;
	294
	295	atomic_set(&rot_state->common_attributes.data_ready, 0);
	296
	297	ret = hid_sensor_setup_trigger(indio_dev, name,
	298	&rot_state->common_attributes);
	299	if (ret) {
	300	dev_err(&pdev->dev, "trigger setup failed\n");
	301	return ret;
	302	}
	303
	304	ret = iio_device_register(indio_dev);
	305	if (ret) {
	306	dev_err(&pdev->dev, "device register failed\n");
	307	goto error_remove_trigger;
	308	}
	309
	310	rot_state->callbacks.send_event = dev_rot_proc_event;
	311	rot_state->callbacks.capture_sample = dev_rot_capture_sample;
	312	rot_state->callbacks.pdev = pdev;
	313	ret = sensor_hub_register_callback(hsdev, hsdev->usage,
	314	&rot_state->callbacks);
	315	if (ret) {
	316	dev_err(&pdev->dev, "callback reg failed\n");
	317	goto error_iio_unreg;
	318	}
	319
	320	return 0;
	321
	322	error_iio_unreg:
	323	iio_device_unregister(indio_dev);
	324	error_remove_trigger:
	325	hid_sensor_remove_trigger(indio_dev, &rot_state->common_attributes);
	326	return ret;
	327	}
	328
	329	/* Function to deinitialize the processing for usage id */
	330	static void hid_dev_rot_remove(struct platform_device *pdev)
	331	{
	332	struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
	333	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
	334	struct dev_rot_state *rot_state = iio_priv(indio_dev);
	335
	336	sensor_hub_remove_callback(hsdev, hsdev->usage);
	337	iio_device_unregister(indio_dev);
	338	hid_sensor_remove_trigger(indio_dev, &rot_state->common_attributes);
	339	}
	340
	341	static const struct platform_device_id hid_dev_rot_ids[] = {
	342	{
	343	/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
	344	.name = "HID-SENSOR-20008a",
	345	},
	346	{
	347	/* Relative orientation(AG) sensor */
	348	.name = "HID-SENSOR-20008e",
	349	},
	350	{
	351	/* Geomagnetic orientation(AM) sensor */
	352	.name = "HID-SENSOR-2000c1",
	353	},
	354	{ }
	355	};
	356	MODULE_DEVICE_TABLE(platform, hid_dev_rot_ids);
	357
	358	static struct platform_driver hid_dev_rot_platform_driver = {
	359	.id_table = hid_dev_rot_ids,
	360	.driver = {
	361	.name = KBUILD_MODNAME,
	362	.pm = &hid_sensor_pm_ops,
	363	},
	364	.probe = hid_dev_rot_probe,
	365	.remove = hid_dev_rot_remove,
	366	};
	367	module_platform_driver(hid_dev_rot_platform_driver);
	368
	369	MODULE_DESCRIPTION("HID Sensor Device Rotation");
	370	MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
	371	MODULE_LICENSE("GPL");
	372	MODULE_IMPORT_NS("IIO_HID");