[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-attributes.h"
#include "../common/hid-sensors/hid-sensor-trigger.h"

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