[linux-2.6-block.git] / drivers / iio / light / hid-sensor-als.c

/*
 * HID Sensors Driver
 * Copyright (c) 2012, 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.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */
#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"

/*Format: HID-SENSOR-usage_id_in_hex*/
/*Usage ID from spec for Ambiant-Light: 0x200041*/
#define DRIVER_NAME "HID-SENSOR-200041"

#define CHANNEL_SCAN_INDEX_ILLUM 0

struct als_state {
	struct hid_sensor_hub_callbacks callbacks;
	struct hid_sensor_common common_attributes;
	struct hid_sensor_hub_attribute_info als_illum;
	u32 illum;
};

/* Channel definitions */
static const struct iio_chan_spec als_channels[] = {
	{
		.type = IIO_INTENSITY,
		.modified = 1,
		.channel2 = IIO_MOD_LIGHT_BOTH,
		.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_ILLUM,
	}
};

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

/* Channel read_raw handler */
static int als_read_raw(struct iio_dev *indio_dev,
			      struct iio_chan_spec const *chan,
			      int *val, int *val2,
			      long mask)
{
	struct als_state *als_state = iio_priv(indio_dev);
	int report_id = -1;
	u32 address;
	int ret;
	int ret_type;

	*val = 0;
	*val2 = 0;
	switch (mask) {
	case 0:
		switch (chan->scan_index) {
		case  CHANNEL_SCAN_INDEX_ILLUM:
			report_id = als_state->als_illum.report_id;
			address =
			HID_USAGE_SENSOR_LIGHT_ILLUM;
			break;
		default:
			report_id = -1;
			break;
		}
		if (report_id >= 0)
			*val = sensor_hub_input_attr_get_raw_value(
				als_state->common_attributes.hsdev,
				HID_USAGE_SENSOR_ALS, address,
				report_id);
		else {
			*val = 0;
			return -EINVAL;
		}
		ret_type = IIO_VAL_INT;
		break;
	case IIO_CHAN_INFO_SCALE:
		*val = als_state->als_illum.units;
		ret_type = IIO_VAL_INT;
		break;
	case IIO_CHAN_INFO_OFFSET:
		*val = hid_sensor_convert_exponent(
				als_state->als_illum.unit_expo);
		ret_type = IIO_VAL_INT;
		break;
	case IIO_CHAN_INFO_SAMP_FREQ:
		ret = hid_sensor_read_samp_freq_value(
				&als_state->common_attributes, val, val2);
		ret_type = IIO_VAL_INT_PLUS_MICRO;
		break;
	case IIO_CHAN_INFO_HYSTERESIS:
		ret = hid_sensor_read_raw_hyst_value(
				&als_state->common_attributes, val, val2);
		ret_type = IIO_VAL_INT_PLUS_MICRO;
		break;
	default:
		ret_type = -EINVAL;
		break;
	}

	return ret_type;
}

/* Channel write_raw handler */
static int als_write_raw(struct iio_dev *indio_dev,
			       struct iio_chan_spec const *chan,
			       int val,
			       int val2,
			       long mask)
{
	struct als_state *als_state = iio_priv(indio_dev);
	int ret = 0;

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

	return ret;
}

static int als_write_raw_get_fmt(struct iio_dev *indio_dev,
			       struct iio_chan_spec const *chan,
			       long mask)
{
	return IIO_VAL_INT_PLUS_MICRO;
}

static const struct iio_info als_info = {
	.driver_module = THIS_MODULE,
	.read_raw = &als_read_raw,
	.write_raw = &als_write_raw,
	.write_raw_get_fmt = &als_write_raw_get_fmt,
};

/* 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);
}

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

	dev_dbg(&indio_dev->dev, "als_proc_event [%d]\n",
				als_state->common_attributes.data_ready);
	if (als_state->common_attributes.data_ready)
		hid_sensor_push_data(indio_dev,
				(u8 *)&als_state->illum,
				sizeof(als_state->illum));

	return 0;
}

/* Capture samples in local storage */
static int als_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 als_state *als_state = iio_priv(indio_dev);
	int ret = -EINVAL;

	switch (usage_id) {
	case HID_USAGE_SENSOR_LIGHT_ILLUM:
		als_state->illum = *(u32 *)raw_data;
		ret = 0;
		break;
	default:
		break;
	}

	return ret;
}

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

	ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
			usage_id,
			HID_USAGE_SENSOR_LIGHT_ILLUM,
			&st->als_illum);
	if (ret < 0)
		return ret;
	als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_ILLUM,
					st->als_illum.size);

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

	return ret;
}

/* Function to initialize the processing for usage id */
static int hid_als_probe(struct platform_device *pdev)
{
	int ret = 0;
	static const char *name = "als";
	struct iio_dev *indio_dev;
	struct als_state *als_state;
	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
	struct iio_chan_spec *channels;

	indio_dev = iio_device_alloc(sizeof(struct als_state));
	if (indio_dev == NULL) {
		ret = -ENOMEM;
		goto error_ret;
	}
	platform_set_drvdata(pdev, indio_dev);

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

	ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_ALS,
					&als_state->common_attributes);
	if (ret) {
		dev_err(&pdev->dev, "failed to setup common attributes\n");
		goto error_free_dev;
	}

	channels = kmemdup(als_channels, sizeof(als_channels), GFP_KERNEL);
	if (!channels) {
		ret = -ENOMEM;
		dev_err(&pdev->dev, "failed to duplicate channels\n");
		goto error_free_dev;
	}

	ret = als_parse_report(pdev, hsdev, channels,
				HID_USAGE_SENSOR_ALS, als_state);
	if (ret) {
		dev_err(&pdev->dev, "failed to setup attributes\n");
		goto error_free_dev_mem;
	}

	indio_dev->channels = channels;
	indio_dev->num_channels =
				ARRAY_SIZE(als_channels);
	indio_dev->dev.parent = &pdev->dev;
	indio_dev->info = &als_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");
		goto error_free_dev_mem;
	}
	als_state->common_attributes.data_ready = false;
	ret = hid_sensor_setup_trigger(indio_dev, name,
				&als_state->common_attributes);
	if (ret < 0) {
		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;
	}

	als_state->callbacks.send_event = als_proc_event;
	als_state->callbacks.capture_sample = als_capture_sample;
	als_state->callbacks.pdev = pdev;
	ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ALS,
					&als_state->callbacks);
	if (ret < 0) {
		dev_err(&pdev->dev, "callback reg failed\n");
		goto error_iio_unreg;
	}

	return ret;

error_iio_unreg:
	iio_device_unregister(indio_dev);
error_remove_trigger:
	hid_sensor_remove_trigger(indio_dev);
error_unreg_buffer_funcs:
	iio_triggered_buffer_cleanup(indio_dev);
error_free_dev_mem:
	kfree(indio_dev->channels);
error_free_dev:
	iio_device_free(indio_dev);
error_ret:
	return ret;
}

/* Function to deinitialize the processing for usage id */
static int hid_als_remove(struct platform_device *pdev)
{
	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
	struct iio_dev *indio_dev = platform_get_drvdata(pdev);

	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ALS);
	iio_device_unregister(indio_dev);
	hid_sensor_remove_trigger(indio_dev);
	iio_triggered_buffer_cleanup(indio_dev);
	kfree(indio_dev->channels);
	iio_device_free(indio_dev);

	return 0;
}

static struct platform_driver hid_als_platform_driver = {
	.driver = {
		.name	= DRIVER_NAME,
		.owner	= THIS_MODULE,
	},
	.probe		= hid_als_probe,
	.remove		= hid_als_remove,
};
module_platform_driver(hid_als_platform_driver);

MODULE_DESCRIPTION("HID Sensor ALS");
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
ed5514c9	1	/*
	2	* HID Sensors Driver
	3	* Copyright (c) 2012, 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	* You should have received a copy of the GNU General Public License along with
	15	* this program; if not, write to the Free Software Foundation, Inc.,
	16	* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	17	*
	18	*/
	19	#include <linux/device.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/module.h>
	22	#include <linux/interrupt.h>
	23	#include <linux/irq.h>
	24	#include <linux/slab.h>
	25	#include <linux/hid-sensor-hub.h>
	26	#include <linux/iio/iio.h>
	27	#include <linux/iio/sysfs.h>
	28	#include <linux/iio/buffer.h>
	29	#include <linux/iio/trigger_consumer.h>
	30	#include <linux/iio/triggered_buffer.h>
ed5514c9	31	#include "../common/hid-sensors/hid-sensor-trigger.h"
	32
	33	/Format: HID-SENSOR-usage_id_in_hex/
39441078	34	/Usage ID from spec for Ambiant-Light: 0x200041/
ed5514c9	35	#define DRIVER_NAME "HID-SENSOR-200041"
	36
	37	#define CHANNEL_SCAN_INDEX_ILLUM 0
	38
	39	struct als_state {
	40	struct hid_sensor_hub_callbacks callbacks;
e07c6d17	41	struct hid_sensor_common common_attributes;
ed5514c9	42	struct hid_sensor_hub_attribute_info als_illum;
	43	u32 illum;
	44	};
	45
	46	/* Channel definitions */
	47	static const struct iio_chan_spec als_channels[] = {
	48	{
	49	.type = IIO_INTENSITY,
	50	.modified = 1,
	51	.channel2 = IIO_MOD_LIGHT_BOTH,
ecbe18f2 JC	52	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) \|
	53	BIT(IIO_CHAN_INFO_SCALE) \|
	54	BIT(IIO_CHAN_INFO_SAMP_FREQ) \|
	55	BIT(IIO_CHAN_INFO_HYSTERESIS),
ed5514c9	56	.scan_index = CHANNEL_SCAN_INDEX_ILLUM,
	57	}
	58	};
	59
	60	/* Adjust channel real bits based on report descriptor */
	61	static void als_adjust_channel_bit_mask(struct iio_chan_spec *channels,
	62	int channel, int size)
	63	{
	64	channels[channel].scan_type.sign = 's';
	65	/* Real storage bits will change based on the report desc. */
	66	channels[channel].scan_type.realbits = size * 8;
	67	/* Maximum size of a sample to capture is u32 */
	68	channels[channel].scan_type.storagebits = sizeof(u32) * 8;
	69	}
	70
	71	/* Channel read_raw handler */
	72	static int als_read_raw(struct iio_dev *indio_dev,
	73	struct iio_chan_spec const *chan,
	74	int val, int val2,
	75	long mask)
	76	{
	77	struct als_state *als_state = iio_priv(indio_dev);
	78	int report_id = -1;
	79	u32 address;
	80	int ret;
	81	int ret_type;
	82
	83	*val = 0;
	84	*val2 = 0;
	85	switch (mask) {
	86	case 0:
	87	switch (chan->scan_index) {
	88	case CHANNEL_SCAN_INDEX_ILLUM:
	89	report_id = als_state->als_illum.report_id;
	90	address =
	91	HID_USAGE_SENSOR_LIGHT_ILLUM;
	92	break;
	93	default:
	94	report_id = -1;
	95	break;
	96	}
	97	if (report_id >= 0)
	98	*val = sensor_hub_input_attr_get_raw_value(
	99	als_state->common_attributes.hsdev,
	100	HID_USAGE_SENSOR_ALS, address,
	101	report_id);
	102	else {
	103	*val = 0;
	104	return -EINVAL;
	105	}
	106	ret_type = IIO_VAL_INT;
	107	break;
	108	case IIO_CHAN_INFO_SCALE:
	109	*val = als_state->als_illum.units;
	110	ret_type = IIO_VAL_INT;
	111	break;
	112	case IIO_CHAN_INFO_OFFSET:
	113	*val = hid_sensor_convert_exponent(
	114	als_state->als_illum.unit_expo);
	115	ret_type = IIO_VAL_INT;
	116	break;
	117	case IIO_CHAN_INFO_SAMP_FREQ:
	118	ret = hid_sensor_read_samp_freq_value(
	119	&als_state->common_attributes, val, val2);
120	ret_type = IIO_VAL_INT_PLUS_MICRO;
121	break;
122	case IIO_CHAN_INFO_HYSTERESIS:
123	ret = hid_sensor_read_raw_hyst_value(
124	&als_state->common_attributes, val, val2);
125	ret_type = IIO_VAL_INT_PLUS_MICRO;
126	break;
127	default:
128	ret_type = -EINVAL;
129	break;
130	}
131
132	return ret_type;
133	}
134
135	/* Channel write_raw handler */
136	static int als_write_raw(struct iio_dev *indio_dev,
137	struct iio_chan_spec const *chan,
138	int val,
139	int val2,
140	long mask)
141	{
142	struct als_state *als_state = iio_priv(indio_dev);
143	int ret = 0;
144
145	switch (mask) {
146	case IIO_CHAN_INFO_SAMP_FREQ:
147	ret = hid_sensor_write_samp_freq_value(
148	&als_state->common_attributes, val, val2);
149	break;
150	case IIO_CHAN_INFO_HYSTERESIS:
151	ret = hid_sensor_write_raw_hyst_value(
152	&als_state->common_attributes, val, val2);
153	break;
154	default:
155	ret = -EINVAL;
156	}
157
158	return ret;
159	}
160
161	static int als_write_raw_get_fmt(struct iio_dev *indio_dev,
162	struct iio_chan_spec const *chan,
163	long mask)
164	{
165	return IIO_VAL_INT_PLUS_MICRO;
166	}
167
168	static const struct iio_info als_info = {
169	.driver_module = THIS_MODULE,
170	.read_raw = &als_read_raw,
171	.write_raw = &als_write_raw,
172	.write_raw_get_fmt = &als_write_raw_get_fmt,
173	};
174
175	/* Function to push data to buffer */
176	static void hid_sensor_push_data(struct iio_dev indio_dev, u8 data, int len)
177	{
ed5514c9	178	dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
84b36ce5	179	iio_push_to_buffers(indio_dev, (u8 *)data);
ed5514c9	180	}
	181
	182	/* Callback handler to send event after all samples are received and captured */
	183	static int als_proc_event(struct hid_sensor_hub_device *hsdev,
	184	unsigned usage_id,
	185	void *priv)
	186	{
	187	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	188	struct als_state *als_state = iio_priv(indio_dev);
	189
	190	dev_dbg(&indio_dev->dev, "als_proc_event [%d]\n",
	191	als_state->common_attributes.data_ready);
	192	if (als_state->common_attributes.data_ready)
	193	hid_sensor_push_data(indio_dev,
	194	(u8 *)&als_state->illum,
	195	sizeof(als_state->illum));
	196
	197	return 0;
	198	}
	199
	200	/* Capture samples in local storage */
	201	static int als_capture_sample(struct hid_sensor_hub_device *hsdev,
	202	unsigned usage_id,
	203	size_t raw_len, char *raw_data,
	204	void *priv)
	205	{
	206	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	207	struct als_state *als_state = iio_priv(indio_dev);
	208	int ret = -EINVAL;
	209
	210	switch (usage_id) {
	211	case HID_USAGE_SENSOR_LIGHT_ILLUM:
	212	als_state->illum = (u32 )raw_data;
	213	ret = 0;
	214	break;
	215	default:
	216	break;
	217	}
	218
	219	return ret;
	220	}
	221
	222	/* Parse report which is specific to an usage id*/
	223	static int als_parse_report(struct platform_device *pdev,
	224	struct hid_sensor_hub_device *hsdev,
	225	struct iio_chan_spec *channels,
	226	unsigned usage_id,
	227	struct als_state *st)
	228	{
	229	int ret;
	230
	231	ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
	232	usage_id,
	233	HID_USAGE_SENSOR_LIGHT_ILLUM,
	234	&st->als_illum);
	235	if (ret < 0)
	236	return ret;
	237	als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_ILLUM,
	238	st->als_illum.size);
	239
	240	dev_dbg(&pdev->dev, "als %x:%x\n", st->als_illum.index,
	241	st->als_illum.report_id);
	242
	243	return ret;
244	}
245
246	/* Function to initialize the processing for usage id */
fc52692c	247	static int hid_als_probe(struct platform_device *pdev)
ed5514c9	248	{
	249	int ret = 0;
	250	static const char *name = "als";
	251	struct iio_dev *indio_dev;
	252	struct als_state *als_state;
	253	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
	254	struct iio_chan_spec *channels;
	255
	256	indio_dev = iio_device_alloc(sizeof(struct als_state));
	257	if (indio_dev == NULL) {
	258	ret = -ENOMEM;
	259	goto error_ret;
	260	}
	261	platform_set_drvdata(pdev, indio_dev);
	262
	263	als_state = iio_priv(indio_dev);
	264	als_state->common_attributes.hsdev = hsdev;
	265	als_state->common_attributes.pdev = pdev;
	266
	267	ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_ALS,
	268	&als_state->common_attributes);
	269	if (ret) {
	270	dev_err(&pdev->dev, "failed to setup common attributes\n");
	271	goto error_free_dev;
	272	}
	273
64ebe955	274	channels = kmemdup(als_channels, sizeof(als_channels), GFP_KERNEL);
ed5514c9	275	if (!channels) {
64ebe955	276	ret = -ENOMEM;
ed5514c9	277	dev_err(&pdev->dev, "failed to duplicate channels\n");
	278	goto error_free_dev;
	279	}
	280
	281	ret = als_parse_report(pdev, hsdev, channels,
	282	HID_USAGE_SENSOR_ALS, als_state);
	283	if (ret) {
	284	dev_err(&pdev->dev, "failed to setup attributes\n");
	285	goto error_free_dev_mem;
	286	}
	287
	288	indio_dev->channels = channels;
	289	indio_dev->num_channels =
	290	ARRAY_SIZE(als_channels);
	291	indio_dev->dev.parent = &pdev->dev;
	292	indio_dev->info = &als_info;
	293	indio_dev->name = name;
	294	indio_dev->modes = INDIO_DIRECT_MODE;
	295
	296	ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
	297	NULL, NULL);
	298	if (ret) {
	299	dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
	300	goto error_free_dev_mem;
	301	}
	302	als_state->common_attributes.data_ready = false;
	303	ret = hid_sensor_setup_trigger(indio_dev, name,
	304	&als_state->common_attributes);
	305	if (ret < 0) {
	306	dev_err(&pdev->dev, "trigger setup failed\n");
	307	goto error_unreg_buffer_funcs;
	308	}
	309
	310	ret = iio_device_register(indio_dev);
	311	if (ret) {
	312	dev_err(&pdev->dev, "device register failed\n");
	313	goto error_remove_trigger;
	314	}
	315
	316	als_state->callbacks.send_event = als_proc_event;
	317	als_state->callbacks.capture_sample = als_capture_sample;
	318	als_state->callbacks.pdev = pdev;
	319	ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ALS,
	320	&als_state->callbacks);
	321	if (ret < 0) {
	322	dev_err(&pdev->dev, "callback reg failed\n");
	323	goto error_iio_unreg;
	324	}
	325
	326	return ret;
	327
	328	error_iio_unreg:
	329	iio_device_unregister(indio_dev);
	330	error_remove_trigger:
	331	hid_sensor_remove_trigger(indio_dev);
	332	error_unreg_buffer_funcs:
	333	iio_triggered_buffer_cleanup(indio_dev);
	334	error_free_dev_mem:
	335	kfree(indio_dev->channels);
	336	error_free_dev:
	337	iio_device_free(indio_dev);
	338	error_ret:
	339	return ret;
	340	}
341
342	/* Function to deinitialize the processing for usage id */
fc52692c	343	static int hid_als_remove(struct platform_device *pdev)
ed5514c9	344	{
	345	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
	346	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
	347
	348	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ALS);
	349	iio_device_unregister(indio_dev);
	350	hid_sensor_remove_trigger(indio_dev);
	351	iio_triggered_buffer_cleanup(indio_dev);
	352	kfree(indio_dev->channels);
	353	iio_device_free(indio_dev);
	354
	355	return 0;
	356	}
	357
	358	static struct platform_driver hid_als_platform_driver = {
	359	.driver = {
	360	.name = DRIVER_NAME,
	361	.owner = THIS_MODULE,
	362	},
	363	.probe = hid_als_probe,
	364	.remove = hid_als_remove,
	365	};
	366	module_platform_driver(hid_als_platform_driver);
	367
	368	MODULE_DESCRIPTION("HID Sensor ALS");
	369	MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
	370	MODULE_LICENSE("GPL");