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

/*
 * HID Sensors Driver
 * Copyright (c) 2014, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/hid-sensor-hub.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_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;
	u32 sampled_vals[4];
};

/* 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_HYSTERESIS)
	}
};

/* 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->sampled_vals[i];
			ret_type = IIO_VAL_INT_MULTIPLE;
			*val_len =  4;
		} else
			ret_type = -EINVAL;
		break;
	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 = {
	.driver_module = THIS_MODULE,
	.read_raw_multi = &dev_rot_read_raw,
	.write_raw = &dev_rot_write_raw,
};

/* Function to push data to buffer */
static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len)
{
	dev_dbg(&indio_dev->dev, "hid_sensor_push_data >>\n");
	iio_push_to_buffers(indio_dev, (u8 *)data);
	dev_dbg(&indio_dev->dev, "hid_sensor_push_data <<\n");

}

/* 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))
		hid_sensor_push_data(indio_dev,
				(u8 *)rot_state->sampled_vals,
				sizeof(rot_state->sampled_vals));

	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) {
		memcpy(rot_state->sampled_vals, raw_data,
					sizeof(rot_state->sampled_vals));
		dev_dbg(&indio_dev->dev, "Recd Quat len:%zu::%zu\n", raw_len,
					sizeof(rot_state->sampled_vals));
	}

	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);

	/* 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_ORIENTATION,
			&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 0;
}

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

	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;

	ret = hid_sensor_parse_common_attributes(hsdev,
				HID_USAGE_SENSOR_DEVICE_ORIENTATION,
				&rot_state->common_attributes);
	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,
				   HID_USAGE_SENSOR_DEVICE_ORIENTATION,
				   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->dev.parent = &pdev->dev;
	indio_dev->info = &dev_rot_info;
	indio_dev->name = name;
	indio_dev->modes = INDIO_DIRECT_MODE;

	ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
		NULL, NULL);
	if (ret) {
		dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
		return ret;
	}
	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");
		goto error_unreg_buffer_funcs;
	}

	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,
					HID_USAGE_SENSOR_DEVICE_ORIENTATION,
					&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(&rot_state->common_attributes);
error_unreg_buffer_funcs:
	iio_triggered_buffer_cleanup(indio_dev);
	return ret;
}

/* Function to deinitialize the processing for usage id */
static int hid_dev_rot_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 dev_rot_state *rot_state = iio_priv(indio_dev);

	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_DEVICE_ORIENTATION);
	iio_device_unregister(indio_dev);
	hid_sensor_remove_trigger(&rot_state->common_attributes);
	iio_triggered_buffer_cleanup(indio_dev);

	return 0;
}

static const struct platform_device_id hid_dev_rot_ids[] = {
	{
		/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
		.name = "HID-SENSOR-20008a",
	},
	{ /* sentinel */ }
};
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,
	},
	.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");
Commit	Line	Data
fc18dddc SP	1	/*
	2	* HID Sensors Driver
	3	* Copyright (c) 2014, Intel Corporation.
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms and conditions of the GNU General Public License,
	7	* version 2, as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*/
	14
	15	#include <linux/device.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/module.h>
	18	#include <linux/interrupt.h>
	19	#include <linux/irq.h>
	20	#include <linux/slab.h>
	21	#include <linux/hid-sensor-hub.h>
	22	#include <linux/iio/iio.h>
	23	#include <linux/iio/sysfs.h>
	24	#include <linux/iio/buffer.h>
	25	#include <linux/iio/trigger_consumer.h>
	26	#include <linux/iio/triggered_buffer.h>
	27	#include "../common/hid-sensors/hid-sensor-trigger.h"
	28
	29	struct dev_rot_state {
	30	struct hid_sensor_hub_callbacks callbacks;
	31	struct hid_sensor_common common_attributes;
	32	struct hid_sensor_hub_attribute_info quaternion;
	33	u32 sampled_vals[4];
	34	};
	35
	36	/* Channel definitions */
	37	static const struct iio_chan_spec dev_rot_channels[] = {
	38	{
	39	.type = IIO_ROT,
	40	.modified = 1,
	41	.channel2 = IIO_MOD_QUATERNION,
	42	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	43	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) \|
	44	BIT(IIO_CHAN_INFO_HYSTERESIS)
	45	}
	46	};
	47
	48	/* Adjust channel real bits based on report descriptor */
	49	static void dev_rot_adjust_channel_bit_mask(struct iio_chan_spec *chan,
	50	int size)
	51	{
	52	chan->scan_type.sign = 's';
	53	/* Real storage bits will change based on the report desc. */
	54	chan->scan_type.realbits = size * 8;
	55	/* Maximum size of a sample to capture is u32 */
	56	chan->scan_type.storagebits = sizeof(u32) * 8;
	57	chan->scan_type.repeat = 4;
	58	}
	59
	60	/* Channel read_raw handler */
	61	static int dev_rot_read_raw(struct iio_dev *indio_dev,
	62	struct iio_chan_spec const *chan,
	63	int size, int vals, int val_len,
	64	long mask)
65	{
66	struct dev_rot_state *rot_state = iio_priv(indio_dev);
67	int ret_type;
68	int i;
69
70	vals[0] = 0;
71	vals[1] = 0;
72
73	switch (mask) {
74	case IIO_CHAN_INFO_RAW:
75	if (size >= 4) {
76	for (i = 0; i < 4; ++i)
77	vals[i] = rot_state->sampled_vals[i];
78	ret_type = IIO_VAL_INT_MULTIPLE;
79	*val_len = 4;
80	} else
81	ret_type = -EINVAL;
82	break;
83	case IIO_CHAN_INFO_SAMP_FREQ:
84	ret_type = hid_sensor_read_samp_freq_value(
85	&rot_state->common_attributes, &vals[0], &vals[1]);
86	break;
87	case IIO_CHAN_INFO_HYSTERESIS:
88	ret_type = hid_sensor_read_raw_hyst_value(
89	&rot_state->common_attributes, &vals[0], &vals[1]);
90	break;
91	default:
92	ret_type = -EINVAL;
93	break;
94	}
95
96	return ret_type;
97	}
98
99	/* Channel write_raw handler */
100	static int dev_rot_write_raw(struct iio_dev *indio_dev,
101	struct iio_chan_spec const *chan,
102	int val,
103	int val2,
104	long mask)
105	{
106	struct dev_rot_state *rot_state = iio_priv(indio_dev);
107	int ret;
108
109	switch (mask) {
110	case IIO_CHAN_INFO_SAMP_FREQ:
111	ret = hid_sensor_write_samp_freq_value(
112	&rot_state->common_attributes, val, val2);
113	break;
114	case IIO_CHAN_INFO_HYSTERESIS:
115	ret = hid_sensor_write_raw_hyst_value(
116	&rot_state->common_attributes, val, val2);
117	break;
118	default:
119	ret = -EINVAL;
120	}
121
122	return ret;
123	}
124
125	static const struct iio_info dev_rot_info = {
126	.driver_module = THIS_MODULE,
127	.read_raw_multi = &dev_rot_read_raw,
128	.write_raw = &dev_rot_write_raw,
129	};
130
131	/* Function to push data to buffer */
132	static void hid_sensor_push_data(struct iio_dev indio_dev, u8 data, int len)
133	{
134	dev_dbg(&indio_dev->dev, "hid_sensor_push_data >>\n");
135	iio_push_to_buffers(indio_dev, (u8 *)data);
136	dev_dbg(&indio_dev->dev, "hid_sensor_push_data <<\n");
137
138	}
139
140	/* Callback handler to send event after all samples are received and captured */
141	static int dev_rot_proc_event(struct hid_sensor_hub_device *hsdev,
142	unsigned usage_id,
143	void *priv)
144	{
145	struct iio_dev *indio_dev = platform_get_drvdata(priv);
146	struct dev_rot_state *rot_state = iio_priv(indio_dev);
147
56ff6be6 SP	148	dev_dbg(&indio_dev->dev, "dev_rot_proc_event\n");
56ff6be6 SP	149	if (atomic_read(&rot_state->common_attributes.data_ready))
fc18dddc SP	150	hid_sensor_push_data(indio_dev,
	151	(u8 *)rot_state->sampled_vals,
	152	sizeof(rot_state->sampled_vals));
	153
	154	return 0;
	155	}
	156
	157	/* Capture samples in local storage */
	158	static int dev_rot_capture_sample(struct hid_sensor_hub_device *hsdev,
	159	unsigned usage_id,
	160	size_t raw_len, char *raw_data,
	161	void *priv)
	162	{
	163	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	164	struct dev_rot_state *rot_state = iio_priv(indio_dev);
	165
	166	if (usage_id == HID_USAGE_SENSOR_ORIENT_QUATERNION) {
	167	memcpy(rot_state->sampled_vals, raw_data,
	168	sizeof(rot_state->sampled_vals));
	169	dev_dbg(&indio_dev->dev, "Recd Quat len:%zu::%zu\n", raw_len,
	170	sizeof(rot_state->sampled_vals));
	171	}
	172
	173	return 0;
	174	}
	175
	176	/* Parse report which is specific to an usage id*/
	177	static int dev_rot_parse_report(struct platform_device *pdev,
	178	struct hid_sensor_hub_device *hsdev,
	179	struct iio_chan_spec *channels,
	180	unsigned usage_id,
	181	struct dev_rot_state *st)
	182	{
	183	int ret;
	184
	185	ret = sensor_hub_input_get_attribute_info(hsdev,
	186	HID_INPUT_REPORT,
	187	usage_id,
	188	HID_USAGE_SENSOR_ORIENT_QUATERNION,
	189	&st->quaternion);
	190	if (ret)
	191	return ret;
	192
	193	dev_rot_adjust_channel_bit_mask(&channels[0],
	194	st->quaternion.size / 4);
	195
	196	dev_dbg(&pdev->dev, "dev_rot %x:%x\n", st->quaternion.index,
	197	st->quaternion.report_id);
	198
	199	dev_dbg(&pdev->dev, "dev_rot: attrib size %d\n",
	200	st->quaternion.size);
	201
	202	/* Set Sensitivity field ids, when there is no individual modifier */
	203	if (st->common_attributes.sensitivity.index < 0) {
	204	sensor_hub_input_get_attribute_info(hsdev,
	205	HID_FEATURE_REPORT, usage_id,
	206	HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS \|
	207	HID_USAGE_SENSOR_DATA_ORIENTATION,
	208	&st->common_attributes.sensitivity);
	209	dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
	210	st->common_attributes.sensitivity.index,
	211	st->common_attributes.sensitivity.report_id);
	212	}
	213
214	return 0;
215	}
216
217	/* Function to initialize the processing for usage id */
218	static int hid_dev_rot_probe(struct platform_device *pdev)
219	{
220	int ret;
221	static char *name = "dev_rotation";
222	struct iio_dev *indio_dev;
223	struct dev_rot_state *rot_state;
224	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
fc18dddc SP	225
	226	indio_dev = devm_iio_device_alloc(&pdev->dev,
	227	sizeof(struct dev_rot_state));
	228	if (indio_dev == NULL)
	229	return -ENOMEM;
	230
	231	platform_set_drvdata(pdev, indio_dev);
	232
	233	rot_state = iio_priv(indio_dev);
	234	rot_state->common_attributes.hsdev = hsdev;
	235	rot_state->common_attributes.pdev = pdev;
	236
	237	ret = hid_sensor_parse_common_attributes(hsdev,
	238	HID_USAGE_SENSOR_DEVICE_ORIENTATION,
	239	&rot_state->common_attributes);
	240	if (ret) {
	241	dev_err(&pdev->dev, "failed to setup common attributes\n");
	242	return ret;
	243	}
	244
2bd04628 FE	245	indio_dev->channels = devm_kmemdup(&pdev->dev, dev_rot_channels,
	246	sizeof(dev_rot_channels),
	247	GFP_KERNEL);
	248	if (!indio_dev->channels) {
fc18dddc SP	249	dev_err(&pdev->dev, "failed to duplicate channels\n");
	250	return -ENOMEM;
	251	}
	252
2bd04628 FE	253	ret = dev_rot_parse_report(pdev, hsdev,
	254	(struct iio_chan_spec *)indio_dev->channels,
	255	HID_USAGE_SENSOR_DEVICE_ORIENTATION,
	256	rot_state);
fc18dddc SP	257	if (ret) {
	258	dev_err(&pdev->dev, "failed to setup attributes\n");
	259	return ret;
	260	}
	261
fc18dddc SP	262	indio_dev->num_channels = ARRAY_SIZE(dev_rot_channels);
	263	indio_dev->dev.parent = &pdev->dev;
	264	indio_dev->info = &dev_rot_info;
	265	indio_dev->name = name;
	266	indio_dev->modes = INDIO_DIRECT_MODE;
	267
	268	ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
	269	NULL, NULL);
	270	if (ret) {
	271	dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
	272	return ret;
	273	}
56ff6be6	274	atomic_set(&rot_state->common_attributes.data_ready, 0);
fc18dddc SP	275	ret = hid_sensor_setup_trigger(indio_dev, name,
	276	&rot_state->common_attributes);
	277	if (ret) {
	278	dev_err(&pdev->dev, "trigger setup failed\n");
	279	goto error_unreg_buffer_funcs;
	280	}
	281
	282	ret = iio_device_register(indio_dev);
	283	if (ret) {
	284	dev_err(&pdev->dev, "device register failed\n");
	285	goto error_remove_trigger;
	286	}
	287
	288	rot_state->callbacks.send_event = dev_rot_proc_event;
	289	rot_state->callbacks.capture_sample = dev_rot_capture_sample;
	290	rot_state->callbacks.pdev = pdev;
	291	ret = sensor_hub_register_callback(hsdev,
	292	HID_USAGE_SENSOR_DEVICE_ORIENTATION,
	293	&rot_state->callbacks);
	294	if (ret) {
	295	dev_err(&pdev->dev, "callback reg failed\n");
	296	goto error_iio_unreg;
	297	}
	298
	299	return 0;
	300
	301	error_iio_unreg:
	302	iio_device_unregister(indio_dev);
	303	error_remove_trigger:
	304	hid_sensor_remove_trigger(&rot_state->common_attributes);
	305	error_unreg_buffer_funcs:
	306	iio_triggered_buffer_cleanup(indio_dev);
	307	return ret;
	308	}
	309
	310	/* Function to deinitialize the processing for usage id */
	311	static int hid_dev_rot_remove(struct platform_device *pdev)
	312	{
	313	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
	314	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
	315	struct dev_rot_state *rot_state = iio_priv(indio_dev);
	316
	317	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_DEVICE_ORIENTATION);
	318	iio_device_unregister(indio_dev);
	319	hid_sensor_remove_trigger(&rot_state->common_attributes);
	320	iio_triggered_buffer_cleanup(indio_dev);
	321
	322	return 0;
	323	}
	324
6b490c6c	325	static const struct platform_device_id hid_dev_rot_ids[] = {
fc18dddc SP	326	{
	327	/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
	328	.name = "HID-SENSOR-20008a",
	329	},
	330	{ /* sentinel */ }
	331	};
	332	MODULE_DEVICE_TABLE(platform, hid_dev_rot_ids);
	333
	334	static struct platform_driver hid_dev_rot_platform_driver = {
	335	.id_table = hid_dev_rot_ids,
	336	.driver = {
	337	.name = KBUILD_MODNAME,
fc18dddc SP	338	},
	339	.probe = hid_dev_rot_probe,
	340	.remove = hid_dev_rot_remove,
	341	};
	342	module_platform_driver(hid_dev_rot_platform_driver);
	343
	344	MODULE_DESCRIPTION("HID Sensor Device Rotation");
	345	MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
	346	MODULE_LICENSE("GPL");