[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/delay.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_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_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;
	s32 poll_value;

	*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) {
			poll_value = hid_sensor_read_poll_value(
						&als_state->common_attributes);
			if (poll_value < 0)
				return -EINVAL;

			hid_sensor_power_state(&als_state->common_attributes,
						true);
			msleep_interruptible(poll_value * 2);

			*val = sensor_hub_input_attr_get_raw_value(
					als_state->common_attributes.hsdev,
					HID_USAGE_SENSOR_ALS, address,
					report_id);
			hid_sensor_power_state(&als_state->common_attributes,
						false);
		} 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>
371a1233	25	#include <linux/delay.h>
ed5514c9	26	#include <linux/hid-sensor-hub.h>
	27	#include <linux/iio/iio.h>
	28	#include <linux/iio/sysfs.h>
	29	#include <linux/iio/buffer.h>
	30	#include <linux/iio/trigger_consumer.h>
	31	#include <linux/iio/triggered_buffer.h>
ed5514c9	32	#include "../common/hid-sensors/hid-sensor-trigger.h"
ed5514c9	33
ed5514c9	34	#define CHANNEL_SCAN_INDEX_ILLUM 0
	35
	36	struct als_state {
	37	struct hid_sensor_hub_callbacks callbacks;
e07c6d17	38	struct hid_sensor_common common_attributes;
ed5514c9	39	struct hid_sensor_hub_attribute_info als_illum;
ed5514c9	40	u32 illum;
36783d09 SP	41	int scale_pre_decml;
	42	int scale_post_decml;
	43	int scale_precision;
	44	int value_offset;
ed5514c9	45	};
	46
	47	/* Channel definitions */
	48	static const struct iio_chan_spec als_channels[] = {
	49	{
	50	.type = IIO_INTENSITY,
	51	.modified = 1,
	52	.channel2 = IIO_MOD_LIGHT_BOTH,
371a1233	53	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
ecbe18f2 JC	54	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) \|
	55	BIT(IIO_CHAN_INFO_SCALE) \|
	56	BIT(IIO_CHAN_INFO_SAMP_FREQ) \|
	57	BIT(IIO_CHAN_INFO_HYSTERESIS),
ed5514c9	58	.scan_index = CHANNEL_SCAN_INDEX_ILLUM,
	59	}
	60	};
	61
	62	/* Adjust channel real bits based on report descriptor */
	63	static void als_adjust_channel_bit_mask(struct iio_chan_spec *channels,
	64	int channel, int size)
	65	{
	66	channels[channel].scan_type.sign = 's';
	67	/* Real storage bits will change based on the report desc. */
	68	channels[channel].scan_type.realbits = size * 8;
	69	/* Maximum size of a sample to capture is u32 */
	70	channels[channel].scan_type.storagebits = sizeof(u32) * 8;
	71	}
	72
	73	/* Channel read_raw handler */
	74	static int als_read_raw(struct iio_dev *indio_dev,
	75	struct iio_chan_spec const *chan,
	76	int val, int val2,
	77	long mask)
	78	{
	79	struct als_state *als_state = iio_priv(indio_dev);
	80	int report_id = -1;
	81	u32 address;
	82	int ret;
	83	int ret_type;
371a1233	84	s32 poll_value;
ed5514c9	85
	86	*val = 0;
	87	*val2 = 0;
	88	switch (mask) {
	89	case 0:
	90	switch (chan->scan_index) {
	91	case CHANNEL_SCAN_INDEX_ILLUM:
	92	report_id = als_state->als_illum.report_id;
	93	address =
	94	HID_USAGE_SENSOR_LIGHT_ILLUM;
	95	break;
	96	default:
	97	report_id = -1;
	98	break;
	99	}
371a1233 SP	100	if (report_id >= 0) {
	101	poll_value = hid_sensor_read_poll_value(
	102	&als_state->common_attributes);
	103	if (poll_value < 0)
	104	return -EINVAL;
	105
	106	hid_sensor_power_state(&als_state->common_attributes,
	107	true);
	108	msleep_interruptible(poll_value * 2);
	109
ed5514c9	110	*val = sensor_hub_input_attr_get_raw_value(
371a1233 SP	111	als_state->common_attributes.hsdev,
	112	HID_USAGE_SENSOR_ALS, address,
	113	report_id);
	114	hid_sensor_power_state(&als_state->common_attributes,
	115	false);
	116	} else {
ed5514c9	117	*val = 0;
	118	return -EINVAL;
	119	}
	120	ret_type = IIO_VAL_INT;
	121	break;
	122	case IIO_CHAN_INFO_SCALE:
36783d09 SP	123	*val = als_state->scale_pre_decml;
	124	*val2 = als_state->scale_post_decml;
	125	ret_type = als_state->scale_precision;
ed5514c9	126	break;
ed5514c9	127	case IIO_CHAN_INFO_OFFSET:
36783d09	128	*val = als_state->value_offset;
ed5514c9	129	ret_type = IIO_VAL_INT;
	130	break;
	131	case IIO_CHAN_INFO_SAMP_FREQ:
	132	ret = hid_sensor_read_samp_freq_value(
	133	&als_state->common_attributes, val, val2);
	134	ret_type = IIO_VAL_INT_PLUS_MICRO;
	135	break;
	136	case IIO_CHAN_INFO_HYSTERESIS:
	137	ret = hid_sensor_read_raw_hyst_value(
	138	&als_state->common_attributes, val, val2);
	139	ret_type = IIO_VAL_INT_PLUS_MICRO;
	140	break;
	141	default:
	142	ret_type = -EINVAL;
	143	break;
	144	}
	145
	146	return ret_type;
	147	}
	148
	149	/* Channel write_raw handler */
	150	static int als_write_raw(struct iio_dev *indio_dev,
	151	struct iio_chan_spec const *chan,
	152	int val,
	153	int val2,
	154	long mask)
	155	{
	156	struct als_state *als_state = iio_priv(indio_dev);
	157	int ret = 0;
	158
	159	switch (mask) {
	160	case IIO_CHAN_INFO_SAMP_FREQ:
	161	ret = hid_sensor_write_samp_freq_value(
	162	&als_state->common_attributes, val, val2);
	163	break;
	164	case IIO_CHAN_INFO_HYSTERESIS:
	165	ret = hid_sensor_write_raw_hyst_value(
	166	&als_state->common_attributes, val, val2);
	167	break;
	168	default:
	169	ret = -EINVAL;
	170	}
	171
	172	return ret;
	173	}
	174
ed5514c9	175	static const struct iio_info als_info = {
	176	.driver_module = THIS_MODULE,
	177	.read_raw = &als_read_raw,
	178	.write_raw = &als_write_raw,
ed5514c9	179	};
	180
	181	/* Function to push data to buffer */
8c60c7e7 LPC	182	static void hid_sensor_push_data(struct iio_dev indio_dev, const void data,
8c60c7e7 LPC	183	int len)
ed5514c9	184	{
ed5514c9	185	dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
8c60c7e7	186	iio_push_to_buffers(indio_dev, data);
ed5514c9	187	}
	188
	189	/* Callback handler to send event after all samples are received and captured */
	190	static int als_proc_event(struct hid_sensor_hub_device *hsdev,
	191	unsigned usage_id,
	192	void *priv)
	193	{
	194	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	195	struct als_state *als_state = iio_priv(indio_dev);
	196
56ff6be6 SP	197	dev_dbg(&indio_dev->dev, "als_proc_event\n");
56ff6be6 SP	198	if (atomic_read(&als_state->common_attributes.data_ready))
ed5514c9	199	hid_sensor_push_data(indio_dev,
8c60c7e7	200	&als_state->illum,
ed5514c9	201	sizeof(als_state->illum));
	202
	203	return 0;
	204	}
	205
	206	/* Capture samples in local storage */
	207	static int als_capture_sample(struct hid_sensor_hub_device *hsdev,
	208	unsigned usage_id,
	209	size_t raw_len, char *raw_data,
	210	void *priv)
	211	{
	212	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	213	struct als_state *als_state = iio_priv(indio_dev);
	214	int ret = -EINVAL;
	215
	216	switch (usage_id) {
	217	case HID_USAGE_SENSOR_LIGHT_ILLUM:
	218	als_state->illum = (u32 )raw_data;
	219	ret = 0;
	220	break;
	221	default:
	222	break;
	223	}
	224
	225	return ret;
	226	}
	227
	228	/* Parse report which is specific to an usage id*/
	229	static int als_parse_report(struct platform_device *pdev,
	230	struct hid_sensor_hub_device *hsdev,
	231	struct iio_chan_spec *channels,
	232	unsigned usage_id,
	233	struct als_state *st)
	234	{
	235	int ret;
	236
	237	ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
	238	usage_id,
	239	HID_USAGE_SENSOR_LIGHT_ILLUM,
	240	&st->als_illum);
	241	if (ret < 0)
	242	return ret;
	243	als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_ILLUM,
	244	st->als_illum.size);
	245
	246	dev_dbg(&pdev->dev, "als %x:%x\n", st->als_illum.index,
	247	st->als_illum.report_id);
	248
36783d09 SP	249	st->scale_precision = hid_sensor_format_scale(
	250	HID_USAGE_SENSOR_ALS,
	251	&st->als_illum,
	252	&st->scale_pre_decml, &st->scale_post_decml);
	253
f87ee1bd SP	254	/* Set Sensitivity field ids, when there is no individual modifier */
	255	if (st->common_attributes.sensitivity.index < 0) {
	256	sensor_hub_input_get_attribute_info(hsdev,
	257	HID_FEATURE_REPORT, usage_id,
	258	HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS \|
	259	HID_USAGE_SENSOR_DATA_LIGHT,
	260	&st->common_attributes.sensitivity);
	261	dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
	262	st->common_attributes.sensitivity.index,
	263	st->common_attributes.sensitivity.report_id);
	264	}
ed5514c9	265	return ret;
	266	}
	267
	268	/* Function to initialize the processing for usage id */
fc52692c	269	static int hid_als_probe(struct platform_device *pdev)
ed5514c9	270	{
	271	int ret = 0;
	272	static const char *name = "als";
	273	struct iio_dev *indio_dev;
	274	struct als_state *als_state;
	275	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
	276	struct iio_chan_spec *channels;
	277
47aff92c SK	278	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state));
	279	if (!indio_dev)
	280	return -ENOMEM;
ed5514c9	281	platform_set_drvdata(pdev, indio_dev);
	282
	283	als_state = iio_priv(indio_dev);
	284	als_state->common_attributes.hsdev = hsdev;
	285	als_state->common_attributes.pdev = pdev;
	286
	287	ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_ALS,
	288	&als_state->common_attributes);
	289	if (ret) {
	290	dev_err(&pdev->dev, "failed to setup common attributes\n");
47aff92c	291	return ret;
ed5514c9	292	}
ed5514c9	293
64ebe955	294	channels = kmemdup(als_channels, sizeof(als_channels), GFP_KERNEL);
ed5514c9	295	if (!channels) {
ed5514c9	296	dev_err(&pdev->dev, "failed to duplicate channels\n");
47aff92c	297	return -ENOMEM;
ed5514c9	298	}
	299
	300	ret = als_parse_report(pdev, hsdev, channels,
	301	HID_USAGE_SENSOR_ALS, als_state);
	302	if (ret) {
	303	dev_err(&pdev->dev, "failed to setup attributes\n");
	304	goto error_free_dev_mem;
	305	}
	306
	307	indio_dev->channels = channels;
	308	indio_dev->num_channels =
	309	ARRAY_SIZE(als_channels);
	310	indio_dev->dev.parent = &pdev->dev;
	311	indio_dev->info = &als_info;
	312	indio_dev->name = name;
	313	indio_dev->modes = INDIO_DIRECT_MODE;
	314
	315	ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
	316	NULL, NULL);
	317	if (ret) {
	318	dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
	319	goto error_free_dev_mem;
	320	}
56ff6be6	321	atomic_set(&als_state->common_attributes.data_ready, 0);
ed5514c9	322	ret = hid_sensor_setup_trigger(indio_dev, name,
	323	&als_state->common_attributes);
	324	if (ret < 0) {
	325	dev_err(&pdev->dev, "trigger setup failed\n");
	326	goto error_unreg_buffer_funcs;
	327	}
	328
	329	ret = iio_device_register(indio_dev);
	330	if (ret) {
	331	dev_err(&pdev->dev, "device register failed\n");
	332	goto error_remove_trigger;
	333	}
	334
	335	als_state->callbacks.send_event = als_proc_event;
	336	als_state->callbacks.capture_sample = als_capture_sample;
	337	als_state->callbacks.pdev = pdev;
	338	ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ALS,
	339	&als_state->callbacks);
	340	if (ret < 0) {
	341	dev_err(&pdev->dev, "callback reg failed\n");
	342	goto error_iio_unreg;
	343	}
	344
	345	return ret;
	346
	347	error_iio_unreg:
	348	iio_device_unregister(indio_dev);
	349	error_remove_trigger:
ec7f68e0	350	hid_sensor_remove_trigger(&als_state->common_attributes);
ed5514c9	351	error_unreg_buffer_funcs:
	352	iio_triggered_buffer_cleanup(indio_dev);
	353	error_free_dev_mem:
	354	kfree(indio_dev->channels);
ed5514c9	355	return ret;
	356	}
	357
	358	/* Function to deinitialize the processing for usage id */
fc52692c	359	static int hid_als_remove(struct platform_device *pdev)
ed5514c9	360	{
	361	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
	362	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
ec7f68e0	363	struct als_state *als_state = iio_priv(indio_dev);
ed5514c9	364
	365	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ALS);
	366	iio_device_unregister(indio_dev);
ec7f68e0	367	hid_sensor_remove_trigger(&als_state->common_attributes);
ed5514c9	368	iio_triggered_buffer_cleanup(indio_dev);
ed5514c9	369	kfree(indio_dev->channels);
ed5514c9	370
	371	return 0;
	372	}
	373
5b812ea5 AH	374	static struct platform_device_id hid_als_ids[] = {
	375	{
	376	/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
	377	.name = "HID-SENSOR-200041",
	378	},
	379	{ /* sentinel */ }
	380	};
	381	MODULE_DEVICE_TABLE(platform, hid_als_ids);
	382
ed5514c9	383	static struct platform_driver hid_als_platform_driver = {
5b812ea5	384	.id_table = hid_als_ids,
ed5514c9	385	.driver = {
5b812ea5	386	.name = KBUILD_MODNAME,
ed5514c9	387	.owner = THIS_MODULE,
	388	},
	389	.probe = hid_als_probe,
	390	.remove = hid_als_remove,
	391	};
	392	module_platform_driver(hid_als_platform_driver);
	393
	394	MODULE_DESCRIPTION("HID Sensor ALS");
	395	MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
	396	MODULE_LICENSE("GPL");