[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"

enum {
	CHANNEL_SCAN_INDEX_INTENSITY = 0,
	CHANNEL_SCAN_INDEX_ILLUM = 1,
	CHANNEL_SCAN_INDEX_MAX
};

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_SCAN_INDEX_MAX];
	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_INTENSITY,
	},
	{
		.type = IIO_LIGHT,
		.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_type;
	s32 min;

	*val = 0;
	*val2 = 0;
	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		switch (chan->scan_index) {
		case  CHANNEL_SCAN_INDEX_INTENSITY:
		case  CHANNEL_SCAN_INDEX_ILLUM:
			report_id = als_state->als_illum.report_id;
			min = als_state->als_illum.logical_minimum;
			address = HID_USAGE_SENSOR_LIGHT_ILLUM;
			break;
		default:
			report_id = -1;
			break;
		}
		if (report_id >= 0) {
			hid_sensor_power_state(&als_state->common_attributes,
						true);
			*val = sensor_hub_input_attr_get_raw_value(
					als_state->common_attributes.hsdev,
					HID_USAGE_SENSOR_ALS, address,
					report_id,
					SENSOR_HUB_SYNC,
					min < 0);
			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_type = hid_sensor_read_samp_freq_value(
				&als_state->common_attributes, val, val2);
		break;
	case IIO_CHAN_INFO_HYSTERESIS:
		ret_type = hid_sensor_read_raw_hyst_value(
				&als_state->common_attributes, val, val2);
		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 = {
	.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;
	u32 sample_data = *(u32 *)raw_data;

	switch (usage_id) {
	case HID_USAGE_SENSOR_LIGHT_ILLUM:
		als_state->illum[CHANNEL_SCAN_INDEX_INTENSITY] = sample_data;
		als_state->illum[CHANNEL_SCAN_INDEX_ILLUM] = sample_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_INTENSITY,
				    st->als_illum.size);
	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;

	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;
	}

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

	ret = als_parse_report(pdev, hsdev,
			       (struct iio_chan_spec *)indio_dev->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->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 const 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,
		.pm	= &hid_sensor_pm_ops,
	},
	.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
578f8d77 KHL	34	enum {
	35	CHANNEL_SCAN_INDEX_INTENSITY = 0,
	36	CHANNEL_SCAN_INDEX_ILLUM = 1,
	37	CHANNEL_SCAN_INDEX_MAX
	38	};
ed5514c9	39
	40	struct als_state {
	41	struct hid_sensor_hub_callbacks callbacks;
e07c6d17	42	struct hid_sensor_common common_attributes;
ed5514c9	43	struct hid_sensor_hub_attribute_info als_illum;
578f8d77	44	u32 illum[CHANNEL_SCAN_INDEX_MAX];
36783d09 SP	45	int scale_pre_decml;
	46	int scale_post_decml;
	47	int scale_precision;
	48	int value_offset;
ed5514c9	49	};
	50
	51	/* Channel definitions */
	52	static const struct iio_chan_spec als_channels[] = {
	53	{
	54	.type = IIO_INTENSITY,
	55	.modified = 1,
	56	.channel2 = IIO_MOD_LIGHT_BOTH,
371a1233	57	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
ecbe18f2 JC	58	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) \|
	59	BIT(IIO_CHAN_INFO_SCALE) \|
	60	BIT(IIO_CHAN_INFO_SAMP_FREQ) \|
	61	BIT(IIO_CHAN_INFO_HYSTERESIS),
578f8d77 KHL	62	.scan_index = CHANNEL_SCAN_INDEX_INTENSITY,
	63	},
	64	{
	65	.type = IIO_LIGHT,
	66	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	67	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) \|
	68	BIT(IIO_CHAN_INFO_SCALE) \|
	69	BIT(IIO_CHAN_INFO_SAMP_FREQ) \|
	70	BIT(IIO_CHAN_INFO_HYSTERESIS),
ed5514c9	71	.scan_index = CHANNEL_SCAN_INDEX_ILLUM,
	72	}
	73	};
	74
	75	/* Adjust channel real bits based on report descriptor */
	76	static void als_adjust_channel_bit_mask(struct iio_chan_spec *channels,
	77	int channel, int size)
	78	{
	79	channels[channel].scan_type.sign = 's';
	80	/* Real storage bits will change based on the report desc. */
	81	channels[channel].scan_type.realbits = size * 8;
	82	/* Maximum size of a sample to capture is u32 */
	83	channels[channel].scan_type.storagebits = sizeof(u32) * 8;
	84	}
	85
	86	/* Channel read_raw handler */
	87	static int als_read_raw(struct iio_dev *indio_dev,
	88	struct iio_chan_spec const *chan,
	89	int val, int val2,
	90	long mask)
	91	{
	92	struct als_state *als_state = iio_priv(indio_dev);
	93	int report_id = -1;
	94	u32 address;
ed5514c9	95	int ret_type;
0145b505	96	s32 min;
ed5514c9	97
	98	*val = 0;
	99	*val2 = 0;
	100	switch (mask) {
67464a54	101	case IIO_CHAN_INFO_RAW:
ed5514c9	102	switch (chan->scan_index) {
578f8d77	103	case CHANNEL_SCAN_INDEX_INTENSITY:
ed5514c9	104	case CHANNEL_SCAN_INDEX_ILLUM:
ed5514c9	105	report_id = als_state->als_illum.report_id;
0145b505 HG	106	min = als_state->als_illum.logical_minimum;
0145b505 HG	107	address = HID_USAGE_SENSOR_LIGHT_ILLUM;
ed5514c9	108	break;
	109	default:
	110	report_id = -1;
	111	break;
	112	}
371a1233	113	if (report_id >= 0) {
371a1233 SP	114	hid_sensor_power_state(&als_state->common_attributes,
371a1233 SP	115	true);
ed5514c9	116	*val = sensor_hub_input_attr_get_raw_value(
371a1233 SP	117	als_state->common_attributes.hsdev,
371a1233 SP	118	HID_USAGE_SENSOR_ALS, address,
b3f4737d	119	report_id,
0145b505 HG	120	SENSOR_HUB_SYNC,
0145b505 HG	121	min < 0);
371a1233 SP	122	hid_sensor_power_state(&als_state->common_attributes,
	123	false);
	124	} else {
ed5514c9	125	*val = 0;
	126	return -EINVAL;
	127	}
	128	ret_type = IIO_VAL_INT;
	129	break;
	130	case IIO_CHAN_INFO_SCALE:
36783d09 SP	131	*val = als_state->scale_pre_decml;
	132	*val2 = als_state->scale_post_decml;
	133	ret_type = als_state->scale_precision;
ed5514c9	134	break;
ed5514c9	135	case IIO_CHAN_INFO_OFFSET:
36783d09	136	*val = als_state->value_offset;
ed5514c9	137	ret_type = IIO_VAL_INT;
	138	break;
	139	case IIO_CHAN_INFO_SAMP_FREQ:
5d24b0b3	140	ret_type = hid_sensor_read_samp_freq_value(
ed5514c9	141	&als_state->common_attributes, val, val2);
ed5514c9	142	break;
ed5514c9	143	case IIO_CHAN_INFO_HYSTERESIS:
5d24b0b3	144	ret_type = hid_sensor_read_raw_hyst_value(
ed5514c9	145	&als_state->common_attributes, val, val2);
ed5514c9	146	break;
	147	default:
	148	ret_type = -EINVAL;
	149	break;
	150	}
	151
	152	return ret_type;
	153	}
	154
	155	/* Channel write_raw handler */
	156	static int als_write_raw(struct iio_dev *indio_dev,
	157	struct iio_chan_spec const *chan,
	158	int val,
	159	int val2,
	160	long mask)
	161	{
	162	struct als_state *als_state = iio_priv(indio_dev);
	163	int ret = 0;
	164
	165	switch (mask) {
	166	case IIO_CHAN_INFO_SAMP_FREQ:
	167	ret = hid_sensor_write_samp_freq_value(
	168	&als_state->common_attributes, val, val2);
	169	break;
	170	case IIO_CHAN_INFO_HYSTERESIS:
	171	ret = hid_sensor_write_raw_hyst_value(
	172	&als_state->common_attributes, val, val2);
	173	break;
	174	default:
	175	ret = -EINVAL;
	176	}
	177
	178	return ret;
	179	}
	180
ed5514c9	181	static const struct iio_info als_info = {
ed5514c9	182	.read_raw = &als_read_raw,
ed5514c9	183	.write_raw = &als_write_raw,
ed5514c9	184	};
	185
	186	/* Function to push data to buffer */
8c60c7e7 LPC	187	static void hid_sensor_push_data(struct iio_dev indio_dev, const void data,
8c60c7e7 LPC	188	int len)
ed5514c9	189	{
ed5514c9	190	dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
8c60c7e7	191	iio_push_to_buffers(indio_dev, data);
ed5514c9	192	}
	193
	194	/* Callback handler to send event after all samples are received and captured */
	195	static int als_proc_event(struct hid_sensor_hub_device *hsdev,
	196	unsigned usage_id,
	197	void *priv)
	198	{
	199	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	200	struct als_state *als_state = iio_priv(indio_dev);
	201
56ff6be6 SP	202	dev_dbg(&indio_dev->dev, "als_proc_event\n");
56ff6be6 SP	203	if (atomic_read(&als_state->common_attributes.data_ready))
ed5514c9	204	hid_sensor_push_data(indio_dev,
8c60c7e7	205	&als_state->illum,
ed5514c9	206	sizeof(als_state->illum));
	207
	208	return 0;
	209	}
	210
	211	/* Capture samples in local storage */
	212	static int als_capture_sample(struct hid_sensor_hub_device *hsdev,
	213	unsigned usage_id,
	214	size_t raw_len, char *raw_data,
	215	void *priv)
	216	{
	217	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	218	struct als_state *als_state = iio_priv(indio_dev);
	219	int ret = -EINVAL;
578f8d77	220	u32 sample_data = (u32 )raw_data;
ed5514c9	221
	222	switch (usage_id) {
	223	case HID_USAGE_SENSOR_LIGHT_ILLUM:
578f8d77 KHL	224	als_state->illum[CHANNEL_SCAN_INDEX_INTENSITY] = sample_data;
578f8d77 KHL	225	als_state->illum[CHANNEL_SCAN_INDEX_ILLUM] = sample_data;
ed5514c9	226	ret = 0;
	227	break;
	228	default:
	229	break;
	230	}
	231
	232	return ret;
	233	}
	234
	235	/* Parse report which is specific to an usage id*/
	236	static int als_parse_report(struct platform_device *pdev,
	237	struct hid_sensor_hub_device *hsdev,
	238	struct iio_chan_spec *channels,
	239	unsigned usage_id,
	240	struct als_state *st)
	241	{
	242	int ret;
	243
	244	ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
	245	usage_id,
	246	HID_USAGE_SENSOR_LIGHT_ILLUM,
	247	&st->als_illum);
	248	if (ret < 0)
	249	return ret;
578f8d77 KHL	250	als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_INTENSITY,
578f8d77 KHL	251	st->als_illum.size);
ed5514c9	252	als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_ILLUM,
	253	st->als_illum.size);
	254
	255	dev_dbg(&pdev->dev, "als %x:%x\n", st->als_illum.index,
	256	st->als_illum.report_id);
	257
36783d09 SP	258	st->scale_precision = hid_sensor_format_scale(
	259	HID_USAGE_SENSOR_ALS,
	260	&st->als_illum,
	261	&st->scale_pre_decml, &st->scale_post_decml);
	262
f87ee1bd SP	263	/* Set Sensitivity field ids, when there is no individual modifier */
	264	if (st->common_attributes.sensitivity.index < 0) {
	265	sensor_hub_input_get_attribute_info(hsdev,
	266	HID_FEATURE_REPORT, usage_id,
	267	HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS \|
	268	HID_USAGE_SENSOR_DATA_LIGHT,
	269	&st->common_attributes.sensitivity);
	270	dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
	271	st->common_attributes.sensitivity.index,
	272	st->common_attributes.sensitivity.report_id);
	273	}
ed5514c9	274	return ret;
	275	}
	276
	277	/* Function to initialize the processing for usage id */
fc52692c	278	static int hid_als_probe(struct platform_device *pdev)
ed5514c9	279	{
	280	int ret = 0;
	281	static const char *name = "als";
	282	struct iio_dev *indio_dev;
	283	struct als_state *als_state;
	284	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
ed5514c9	285
47aff92c SK	286	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state));
	287	if (!indio_dev)
	288	return -ENOMEM;
ed5514c9	289	platform_set_drvdata(pdev, indio_dev);
	290
	291	als_state = iio_priv(indio_dev);
	292	als_state->common_attributes.hsdev = hsdev;
	293	als_state->common_attributes.pdev = pdev;
	294
	295	ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_ALS,
	296	&als_state->common_attributes);
	297	if (ret) {
	298	dev_err(&pdev->dev, "failed to setup common attributes\n");
47aff92c	299	return ret;
ed5514c9	300	}
ed5514c9	301
9ecdbed7 FE	302	indio_dev->channels = kmemdup(als_channels,
	303	sizeof(als_channels), GFP_KERNEL);
	304	if (!indio_dev->channels) {
ed5514c9	305	dev_err(&pdev->dev, "failed to duplicate channels\n");
47aff92c	306	return -ENOMEM;
ed5514c9	307	}
ed5514c9	308
9ecdbed7 FE	309	ret = als_parse_report(pdev, hsdev,
	310	(struct iio_chan_spec *)indio_dev->channels,
	311	HID_USAGE_SENSOR_ALS, als_state);
ed5514c9	312	if (ret) {
	313	dev_err(&pdev->dev, "failed to setup attributes\n");
	314	goto error_free_dev_mem;
	315	}
	316
ed5514c9	317	indio_dev->num_channels =
	318	ARRAY_SIZE(als_channels);
	319	indio_dev->dev.parent = &pdev->dev;
	320	indio_dev->info = &als_info;
	321	indio_dev->name = name;
	322	indio_dev->modes = INDIO_DIRECT_MODE;
	323
	324	ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
	325	NULL, NULL);
	326	if (ret) {
	327	dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
	328	goto error_free_dev_mem;
	329	}
56ff6be6	330	atomic_set(&als_state->common_attributes.data_ready, 0);
ed5514c9	331	ret = hid_sensor_setup_trigger(indio_dev, name,
	332	&als_state->common_attributes);
	333	if (ret < 0) {
	334	dev_err(&pdev->dev, "trigger setup failed\n");
	335	goto error_unreg_buffer_funcs;
	336	}
	337
	338	ret = iio_device_register(indio_dev);
	339	if (ret) {
	340	dev_err(&pdev->dev, "device register failed\n");
	341	goto error_remove_trigger;
	342	}
	343
	344	als_state->callbacks.send_event = als_proc_event;
	345	als_state->callbacks.capture_sample = als_capture_sample;
	346	als_state->callbacks.pdev = pdev;
	347	ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ALS,
	348	&als_state->callbacks);
	349	if (ret < 0) {
	350	dev_err(&pdev->dev, "callback reg failed\n");
	351	goto error_iio_unreg;
	352	}
	353
	354	return ret;
	355
	356	error_iio_unreg:
	357	iio_device_unregister(indio_dev);
	358	error_remove_trigger:
ec7f68e0	359	hid_sensor_remove_trigger(&als_state->common_attributes);
ed5514c9	360	error_unreg_buffer_funcs:
	361	iio_triggered_buffer_cleanup(indio_dev);
	362	error_free_dev_mem:
	363	kfree(indio_dev->channels);
ed5514c9	364	return ret;
	365	}
	366
	367	/* Function to deinitialize the processing for usage id */
fc52692c	368	static int hid_als_remove(struct platform_device *pdev)
ed5514c9	369	{
	370	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
	371	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
ec7f68e0	372	struct als_state *als_state = iio_priv(indio_dev);
ed5514c9	373
	374	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ALS);
	375	iio_device_unregister(indio_dev);
ec7f68e0	376	hid_sensor_remove_trigger(&als_state->common_attributes);
ed5514c9	377	iio_triggered_buffer_cleanup(indio_dev);
ed5514c9	378	kfree(indio_dev->channels);
ed5514c9	379
	380	return 0;
	381	}
	382
4e617fc1	383	static const struct platform_device_id hid_als_ids[] = {
5b812ea5 AH	384	{
	385	/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
	386	.name = "HID-SENSOR-200041",
	387	},
	388	{ /* sentinel */ }
	389	};
	390	MODULE_DEVICE_TABLE(platform, hid_als_ids);
	391
ed5514c9	392	static struct platform_driver hid_als_platform_driver = {
5b812ea5	393	.id_table = hid_als_ids,
ed5514c9	394	.driver = {
5b812ea5	395	.name = KBUILD_MODNAME,
2c615aff	396	.pm = &hid_sensor_pm_ops,
ed5514c9	397	},
	398	.probe = hid_als_probe,
	399	.remove = hid_als_remove,
	400	};
	401	module_platform_driver(hid_als_platform_driver);
	402
	403	MODULE_DESCRIPTION("HID Sensor ALS");
	404	MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
	405	MODULE_LICENSE("GPL");