[deliverable/linux.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"

#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;
	int scale_pre_decml;
	int scale_post_decml;
	int scale_precision;
	int value_offset;
};

/* 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->scale_pre_decml;
		*val2 = als_state->scale_post_decml;
		ret_type = als_state->scale_precision;
		break;
	case IIO_CHAN_INFO_OFFSET:
		*val = als_state->value_offset;
		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 const struct iio_info als_info = {
	.driver_module = THIS_MODULE,
	.read_raw = &als_read_raw,
	.write_raw = &als_write_raw,
};

/* Function to push data to buffer */
static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
					int len)
{
	dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
	iio_push_to_buffers(indio_dev, 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\n");
	if (atomic_read(&als_state->common_attributes.data_ready))
		hid_sensor_push_data(indio_dev,
				&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);

	st->scale_precision = hid_sensor_format_scale(
				HID_USAGE_SENSOR_ALS,
				&st->als_illum,
				&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_LIGHT,
			&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_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 = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state));
	if (!indio_dev)
		return -ENOMEM;
	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");
		return ret;
	}

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

	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;
	}
	atomic_set(&als_state->common_attributes.data_ready, 0);
	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(&als_state->common_attributes);
error_unreg_buffer_funcs:
	iio_triggered_buffer_cleanup(indio_dev);
error_free_dev_mem:
	kfree(indio_dev->channels);
	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);
	struct als_state *als_state = iio_priv(indio_dev);

	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ALS);
	iio_device_unregister(indio_dev);
	hid_sensor_remove_trigger(&als_state->common_attributes);
	iio_triggered_buffer_cleanup(indio_dev);
	kfree(indio_dev->channels);

	return 0;
}

static struct platform_device_id hid_als_ids[] = {
	{
		/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
		.name = "HID-SENSOR-200041",
	},
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, hid_als_ids);

static struct platform_driver hid_als_platform_driver = {
	.id_table = hid_als_ids,
	.driver = {
		.name	= KBUILD_MODNAME,
		.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"
ed5514c9	32
ed5514c9	33	#define CHANNEL_SCAN_INDEX_ILLUM 0
	34
	35	struct als_state {
	36	struct hid_sensor_hub_callbacks callbacks;
e07c6d17	37	struct hid_sensor_common common_attributes;
ed5514c9	38	struct hid_sensor_hub_attribute_info als_illum;
ed5514c9	39	u32 illum;
36783d09 SP	40	int scale_pre_decml;
	41	int scale_post_decml;
	42	int scale_precision;
	43	int value_offset;
ed5514c9	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:
36783d09 SP	109	*val = als_state->scale_pre_decml;
	110	*val2 = als_state->scale_post_decml;
	111	ret_type = als_state->scale_precision;
ed5514c9	112	break;
ed5514c9	113	case IIO_CHAN_INFO_OFFSET:
36783d09	114	*val = als_state->value_offset;
ed5514c9	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
ed5514c9	161	static const struct iio_info als_info = {
	162	.driver_module = THIS_MODULE,
	163	.read_raw = &als_read_raw,
	164	.write_raw = &als_write_raw,
ed5514c9	165	};
	166
	167	/* Function to push data to buffer */
8c60c7e7 LPC	168	static void hid_sensor_push_data(struct iio_dev indio_dev, const void data,
8c60c7e7 LPC	169	int len)
ed5514c9	170	{
ed5514c9	171	dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
8c60c7e7	172	iio_push_to_buffers(indio_dev, data);
ed5514c9	173	}
	174
	175	/* Callback handler to send event after all samples are received and captured */
	176	static int als_proc_event(struct hid_sensor_hub_device *hsdev,
	177	unsigned usage_id,
	178	void *priv)
	179	{
	180	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	181	struct als_state *als_state = iio_priv(indio_dev);
	182
56ff6be6 SP	183	dev_dbg(&indio_dev->dev, "als_proc_event\n");
56ff6be6 SP	184	if (atomic_read(&als_state->common_attributes.data_ready))
ed5514c9	185	hid_sensor_push_data(indio_dev,
8c60c7e7	186	&als_state->illum,
ed5514c9	187	sizeof(als_state->illum));
	188
	189	return 0;
	190	}
	191
	192	/* Capture samples in local storage */
	193	static int als_capture_sample(struct hid_sensor_hub_device *hsdev,
	194	unsigned usage_id,
	195	size_t raw_len, char *raw_data,
	196	void *priv)
	197	{
	198	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	199	struct als_state *als_state = iio_priv(indio_dev);
	200	int ret = -EINVAL;
	201
	202	switch (usage_id) {
	203	case HID_USAGE_SENSOR_LIGHT_ILLUM:
	204	als_state->illum = (u32 )raw_data;
	205	ret = 0;
	206	break;
	207	default:
	208	break;
	209	}
	210
	211	return ret;
	212	}
	213
	214	/* Parse report which is specific to an usage id*/
	215	static int als_parse_report(struct platform_device *pdev,
	216	struct hid_sensor_hub_device *hsdev,
	217	struct iio_chan_spec *channels,
	218	unsigned usage_id,
	219	struct als_state *st)
	220	{
	221	int ret;
	222
	223	ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
	224	usage_id,
	225	HID_USAGE_SENSOR_LIGHT_ILLUM,
	226	&st->als_illum);
	227	if (ret < 0)
	228	return ret;
	229	als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_ILLUM,
	230	st->als_illum.size);
	231
	232	dev_dbg(&pdev->dev, "als %x:%x\n", st->als_illum.index,
	233	st->als_illum.report_id);
	234
36783d09 SP	235	st->scale_precision = hid_sensor_format_scale(
	236	HID_USAGE_SENSOR_ALS,
	237	&st->als_illum,
	238	&st->scale_pre_decml, &st->scale_post_decml);
	239
f87ee1bd SP	240	/* Set Sensitivity field ids, when there is no individual modifier */
	241	if (st->common_attributes.sensitivity.index < 0) {
	242	sensor_hub_input_get_attribute_info(hsdev,
	243	HID_FEATURE_REPORT, usage_id,
	244	HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS \|
	245	HID_USAGE_SENSOR_DATA_LIGHT,
	246	&st->common_attributes.sensitivity);
	247	dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
	248	st->common_attributes.sensitivity.index,
	249	st->common_attributes.sensitivity.report_id);
	250	}
ed5514c9	251	return ret;
	252	}
	253
	254	/* Function to initialize the processing for usage id */
fc52692c	255	static int hid_als_probe(struct platform_device *pdev)
ed5514c9	256	{
	257	int ret = 0;
	258	static const char *name = "als";
	259	struct iio_dev *indio_dev;
	260	struct als_state *als_state;
	261	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
	262	struct iio_chan_spec *channels;
	263
47aff92c SK	264	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state));
	265	if (!indio_dev)
	266	return -ENOMEM;
ed5514c9	267	platform_set_drvdata(pdev, indio_dev);
	268
	269	als_state = iio_priv(indio_dev);
	270	als_state->common_attributes.hsdev = hsdev;
	271	als_state->common_attributes.pdev = pdev;
	272
	273	ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_ALS,
	274	&als_state->common_attributes);
	275	if (ret) {
	276	dev_err(&pdev->dev, "failed to setup common attributes\n");
47aff92c	277	return ret;
ed5514c9	278	}
ed5514c9	279
64ebe955	280	channels = kmemdup(als_channels, sizeof(als_channels), GFP_KERNEL);
ed5514c9	281	if (!channels) {
ed5514c9	282	dev_err(&pdev->dev, "failed to duplicate channels\n");
47aff92c	283	return -ENOMEM;
ed5514c9	284	}
	285
	286	ret = als_parse_report(pdev, hsdev, channels,
	287	HID_USAGE_SENSOR_ALS, als_state);
	288	if (ret) {
	289	dev_err(&pdev->dev, "failed to setup attributes\n");
	290	goto error_free_dev_mem;
	291	}
	292
	293	indio_dev->channels = channels;
	294	indio_dev->num_channels =
	295	ARRAY_SIZE(als_channels);
	296	indio_dev->dev.parent = &pdev->dev;
	297	indio_dev->info = &als_info;
	298	indio_dev->name = name;
	299	indio_dev->modes = INDIO_DIRECT_MODE;
	300
	301	ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
	302	NULL, NULL);
	303	if (ret) {
	304	dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
	305	goto error_free_dev_mem;
	306	}
56ff6be6	307	atomic_set(&als_state->common_attributes.data_ready, 0);
ed5514c9	308	ret = hid_sensor_setup_trigger(indio_dev, name,
	309	&als_state->common_attributes);
	310	if (ret < 0) {
	311	dev_err(&pdev->dev, "trigger setup failed\n");
	312	goto error_unreg_buffer_funcs;
	313	}
	314
	315	ret = iio_device_register(indio_dev);
	316	if (ret) {
	317	dev_err(&pdev->dev, "device register failed\n");
	318	goto error_remove_trigger;
	319	}
	320
	321	als_state->callbacks.send_event = als_proc_event;
	322	als_state->callbacks.capture_sample = als_capture_sample;
	323	als_state->callbacks.pdev = pdev;
	324	ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ALS,
	325	&als_state->callbacks);
	326	if (ret < 0) {
	327	dev_err(&pdev->dev, "callback reg failed\n");
	328	goto error_iio_unreg;
	329	}
	330
	331	return ret;
	332
	333	error_iio_unreg:
	334	iio_device_unregister(indio_dev);
	335	error_remove_trigger:
ec7f68e0	336	hid_sensor_remove_trigger(&als_state->common_attributes);
ed5514c9	337	error_unreg_buffer_funcs:
	338	iio_triggered_buffer_cleanup(indio_dev);
	339	error_free_dev_mem:
	340	kfree(indio_dev->channels);
ed5514c9	341	return ret;
	342	}
	343
	344	/* Function to deinitialize the processing for usage id */
fc52692c	345	static int hid_als_remove(struct platform_device *pdev)
ed5514c9	346	{
	347	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
	348	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
ec7f68e0	349	struct als_state *als_state = iio_priv(indio_dev);
ed5514c9	350
	351	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ALS);
	352	iio_device_unregister(indio_dev);
ec7f68e0	353	hid_sensor_remove_trigger(&als_state->common_attributes);
ed5514c9	354	iio_triggered_buffer_cleanup(indio_dev);
ed5514c9	355	kfree(indio_dev->channels);
ed5514c9	356
	357	return 0;
	358	}
	359
5b812ea5 AH	360	static struct platform_device_id hid_als_ids[] = {
	361	{
	362	/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
	363	.name = "HID-SENSOR-200041",
	364	},
	365	{ /* sentinel */ }
	366	};
	367	MODULE_DEVICE_TABLE(platform, hid_als_ids);
	368
ed5514c9	369	static struct platform_driver hid_als_platform_driver = {
5b812ea5	370	.id_table = hid_als_ids,
ed5514c9	371	.driver = {
5b812ea5	372	.name = KBUILD_MODNAME,
ed5514c9	373	.owner = THIS_MODULE,
	374	},
	375	.probe = hid_als_probe,
	376	.remove = hid_als_remove,
	377	};
	378	module_platform_driver(hid_als_platform_driver);
	379
	380	MODULE_DESCRIPTION("HID Sensor ALS");
	381	MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
	382	MODULE_LICENSE("GPL");