[linux-2.6-block.git] / drivers / iio / pressure / hid-sensor-press.c

/*
 * HID Sensors Driver
 * Copyright (c) 2014, 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.
 *
 */
#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_PRESSURE 0

struct press_state {
	struct hid_sensor_hub_callbacks callbacks;
	struct hid_sensor_common common_attributes;
	struct hid_sensor_hub_attribute_info press_attr;
	u32 press_data;
	int scale_pre_decml;
	int scale_post_decml;
	int scale_precision;
	int value_offset;
};

/* Channel definitions */
static const struct iio_chan_spec press_channels[] = {
	{
		.type = IIO_PRESSURE,
		.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_PRESSURE,
	}
};

/* Adjust channel real bits based on report descriptor */
static void press_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 press_read_raw(struct iio_dev *indio_dev,
			      struct iio_chan_spec const *chan,
			      int *val, int *val2,
			      long mask)
{
	struct press_state *press_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_PRESSURE:
			report_id = press_state->press_attr.report_id;
			min = press_state->press_attr.logical_minimum;
			address = HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE;
			break;
		default:
			report_id = -1;
			break;
		}
		if (report_id >= 0) {
			hid_sensor_power_state(&press_state->common_attributes,
						true);
			*val = sensor_hub_input_attr_get_raw_value(
				press_state->common_attributes.hsdev,
				HID_USAGE_SENSOR_PRESSURE, address,
				report_id,
				SENSOR_HUB_SYNC,
				min < 0);
			hid_sensor_power_state(&press_state->common_attributes,
						false);
		} else {
			*val = 0;
			return -EINVAL;
		}
		ret_type = IIO_VAL_INT;
		break;
	case IIO_CHAN_INFO_SCALE:
		*val = press_state->scale_pre_decml;
		*val2 = press_state->scale_post_decml;
		ret_type = press_state->scale_precision;
		break;
	case IIO_CHAN_INFO_OFFSET:
		*val = press_state->value_offset;
		ret_type = IIO_VAL_INT;
		break;
	case IIO_CHAN_INFO_SAMP_FREQ:
		ret_type = hid_sensor_read_samp_freq_value(
				&press_state->common_attributes, val, val2);
		break;
	case IIO_CHAN_INFO_HYSTERESIS:
		ret_type = hid_sensor_read_raw_hyst_value(
				&press_state->common_attributes, val, val2);
		break;
	default:
		ret_type = -EINVAL;
		break;
	}

	return ret_type;
}

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

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

	return ret;
}

static const struct iio_info press_info = {
	.read_raw = &press_read_raw,
	.write_raw = &press_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 press_proc_event(struct hid_sensor_hub_device *hsdev,
				unsigned usage_id,
				void *priv)
{
	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	struct press_state *press_state = iio_priv(indio_dev);

	dev_dbg(&indio_dev->dev, "press_proc_event\n");
	if (atomic_read(&press_state->common_attributes.data_ready))
		hid_sensor_push_data(indio_dev,
				&press_state->press_data,
				sizeof(press_state->press_data));

	return 0;
}

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

	switch (usage_id) {
	case HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE:
		press_state->press_data = *(u32 *)raw_data;
		ret = 0;
		break;
	default:
		break;
	}

	return ret;
}

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

	ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
			usage_id,
			HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE,
			&st->press_attr);
	if (ret < 0)
		return ret;
	press_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESSURE,
					st->press_attr.size);

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

	st->scale_precision = hid_sensor_format_scale(
				HID_USAGE_SENSOR_PRESSURE,
				&st->press_attr,
				&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_ATMOSPHERIC_PRESSURE,
			&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_press_probe(struct platform_device *pdev)
{
	int ret = 0;
	static const char *name = "press";
	struct iio_dev *indio_dev;
	struct press_state *press_state;
	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;

	indio_dev = devm_iio_device_alloc(&pdev->dev,
				sizeof(struct press_state));
	if (!indio_dev)
		return -ENOMEM;
	platform_set_drvdata(pdev, indio_dev);

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

	ret = hid_sensor_parse_common_attributes(hsdev,
					HID_USAGE_SENSOR_PRESSURE,
					&press_state->common_attributes);
	if (ret) {
		dev_err(&pdev->dev, "failed to setup common attributes\n");
		return ret;
	}

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

	ret = press_parse_report(pdev, hsdev,
				 (struct iio_chan_spec *)indio_dev->channels,
				 HID_USAGE_SENSOR_PRESSURE, press_state);
	if (ret) {
		dev_err(&pdev->dev, "failed to setup attributes\n");
		goto error_free_dev_mem;
	}

	indio_dev->num_channels =
				ARRAY_SIZE(press_channels);
	indio_dev->dev.parent = &pdev->dev;
	indio_dev->info = &press_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(&press_state->common_attributes.data_ready, 0);
	ret = hid_sensor_setup_trigger(indio_dev, name,
				&press_state->common_attributes);
	if (ret) {
		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;
	}

	press_state->callbacks.send_event = press_proc_event;
	press_state->callbacks.capture_sample = press_capture_sample;
	press_state->callbacks.pdev = pdev;
	ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PRESSURE,
					&press_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(&press_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_press_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 press_state *press_state = iio_priv(indio_dev);

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

	return 0;
}

static const struct platform_device_id hid_press_ids[] = {
	{
		/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
		.name = "HID-SENSOR-200031",
	},
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, hid_press_ids);

static struct platform_driver hid_press_platform_driver = {
	.id_table = hid_press_ids,
	.driver = {
		.name	= KBUILD_MODNAME,
		.pm	= &hid_sensor_pm_ops,
	},
	.probe		= hid_press_probe,
	.remove		= hid_press_remove,
};
module_platform_driver(hid_press_platform_driver);

MODULE_DESCRIPTION("HID Sensor Pressure");
MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
f64a799b AP	1	/*
	2	* HID Sensors Driver
	3	* Copyright (c) 2014, 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.
	16	*
	17	*/
	18	#include <linux/device.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/module.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/irq.h>
	23	#include <linux/slab.h>
cd5b700f	24	#include <linux/delay.h>
f64a799b AP	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-trigger.h"
	32
	33	#define CHANNEL_SCAN_INDEX_PRESSURE 0
	34
	35	struct press_state {
	36	struct hid_sensor_hub_callbacks callbacks;
	37	struct hid_sensor_common common_attributes;
	38	struct hid_sensor_hub_attribute_info press_attr;
	39	u32 press_data;
a269b9a0 SP	40	int scale_pre_decml;
	41	int scale_post_decml;
	42	int scale_precision;
	43	int value_offset;
f64a799b AP	44	};
	45
	46	/* Channel definitions */
	47	static const struct iio_chan_spec press_channels[] = {
	48	{
	49	.type = IIO_PRESSURE,
f64a799b AP	50	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	51	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) \|
	52	BIT(IIO_CHAN_INFO_SCALE) \|
	53	BIT(IIO_CHAN_INFO_SAMP_FREQ) \|
	54	BIT(IIO_CHAN_INFO_HYSTERESIS),
	55	.scan_index = CHANNEL_SCAN_INDEX_PRESSURE,
	56	}
	57	};
	58
	59	/* Adjust channel real bits based on report descriptor */
	60	static void press_adjust_channel_bit_mask(struct iio_chan_spec *channels,
	61	int channel, int size)
	62	{
	63	channels[channel].scan_type.sign = 's';
	64	/* Real storage bits will change based on the report desc. */
	65	channels[channel].scan_type.realbits = size * 8;
	66	/* Maximum size of a sample to capture is u32 */
	67	channels[channel].scan_type.storagebits = sizeof(u32) * 8;
	68	}
	69
	70	/* Channel read_raw handler */
	71	static int press_read_raw(struct iio_dev *indio_dev,
	72	struct iio_chan_spec const *chan,
	73	int val, int val2,
	74	long mask)
	75	{
	76	struct press_state *press_state = iio_priv(indio_dev);
	77	int report_id = -1;
	78	u32 address;
f64a799b	79	int ret_type;
0145b505	80	s32 min;
f64a799b AP	81
	82	*val = 0;
	83	*val2 = 0;
	84	switch (mask) {
	85	case IIO_CHAN_INFO_RAW:
	86	switch (chan->scan_index) {
	87	case CHANNEL_SCAN_INDEX_PRESSURE:
	88	report_id = press_state->press_attr.report_id;
0145b505 HG	89	min = press_state->press_attr.logical_minimum;
0145b505 HG	90	address = HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE;
f64a799b AP	91	break;
	92	default:
	93	report_id = -1;
	94	break;
	95	}
cd5b700f	96	if (report_id >= 0) {
cd5b700f SP	97	hid_sensor_power_state(&press_state->common_attributes,
cd5b700f SP	98	true);
f64a799b AP	99	*val = sensor_hub_input_attr_get_raw_value(
	100	press_state->common_attributes.hsdev,
	101	HID_USAGE_SENSOR_PRESSURE, address,
b3f4737d	102	report_id,
0145b505 HG	103	SENSOR_HUB_SYNC,
0145b505 HG	104	min < 0);
cd5b700f SP	105	hid_sensor_power_state(&press_state->common_attributes,
	106	false);
	107	} else {
f64a799b AP	108	*val = 0;
	109	return -EINVAL;
	110	}
	111	ret_type = IIO_VAL_INT;
	112	break;
	113	case IIO_CHAN_INFO_SCALE:
a269b9a0 SP	114	*val = press_state->scale_pre_decml;
	115	*val2 = press_state->scale_post_decml;
	116	ret_type = press_state->scale_precision;
f64a799b AP	117	break;
f64a799b AP	118	case IIO_CHAN_INFO_OFFSET:
a269b9a0	119	*val = press_state->value_offset;
f64a799b AP	120	ret_type = IIO_VAL_INT;
	121	break;
	122	case IIO_CHAN_INFO_SAMP_FREQ:
6c3d8d4f	123	ret_type = hid_sensor_read_samp_freq_value(
f64a799b	124	&press_state->common_attributes, val, val2);
f64a799b AP	125	break;
f64a799b AP	126	case IIO_CHAN_INFO_HYSTERESIS:
6c3d8d4f	127	ret_type = hid_sensor_read_raw_hyst_value(
f64a799b	128	&press_state->common_attributes, val, val2);
f64a799b AP	129	break;
	130	default:
	131	ret_type = -EINVAL;
	132	break;
	133	}
	134
	135	return ret_type;
	136	}
	137
	138	/* Channel write_raw handler */
	139	static int press_write_raw(struct iio_dev *indio_dev,
	140	struct iio_chan_spec const *chan,
	141	int val,
	142	int val2,
	143	long mask)
	144	{
	145	struct press_state *press_state = iio_priv(indio_dev);
	146	int ret = 0;
	147
	148	switch (mask) {
	149	case IIO_CHAN_INFO_SAMP_FREQ:
	150	ret = hid_sensor_write_samp_freq_value(
	151	&press_state->common_attributes, val, val2);
	152	break;
	153	case IIO_CHAN_INFO_HYSTERESIS:
	154	ret = hid_sensor_write_raw_hyst_value(
	155	&press_state->common_attributes, val, val2);
	156	break;
	157	default:
	158	ret = -EINVAL;
	159	}
	160
	161	return ret;
	162	}
	163
	164	static const struct iio_info press_info = {
f64a799b AP	165	.read_raw = &press_read_raw,
	166	.write_raw = &press_write_raw,
	167	};
	168
	169	/* Function to push data to buffer */
	170	static void hid_sensor_push_data(struct iio_dev indio_dev, const void data,
	171	int len)
	172	{
	173	dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
	174	iio_push_to_buffers(indio_dev, data);
	175	}
	176
	177	/* Callback handler to send event after all samples are received and captured */
	178	static int press_proc_event(struct hid_sensor_hub_device *hsdev,
	179	unsigned usage_id,
	180	void *priv)
	181	{
	182	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	183	struct press_state *press_state = iio_priv(indio_dev);
	184
56ff6be6 SP	185	dev_dbg(&indio_dev->dev, "press_proc_event\n");
56ff6be6 SP	186	if (atomic_read(&press_state->common_attributes.data_ready))
f64a799b AP	187	hid_sensor_push_data(indio_dev,
	188	&press_state->press_data,
	189	sizeof(press_state->press_data));
	190
	191	return 0;
	192	}
	193
	194	/* Capture samples in local storage */
	195	static int press_capture_sample(struct hid_sensor_hub_device *hsdev,
	196	unsigned usage_id,
	197	size_t raw_len, char *raw_data,
	198	void *priv)
	199	{
	200	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	201	struct press_state *press_state = iio_priv(indio_dev);
	202	int ret = -EINVAL;
	203
	204	switch (usage_id) {
	205	case HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE:
	206	press_state->press_data = (u32 )raw_data;
	207	ret = 0;
	208	break;
	209	default:
	210	break;
	211	}
	212
	213	return ret;
	214	}
	215
	216	/* Parse report which is specific to an usage id*/
	217	static int press_parse_report(struct platform_device *pdev,
	218	struct hid_sensor_hub_device *hsdev,
	219	struct iio_chan_spec *channels,
	220	unsigned usage_id,
	221	struct press_state *st)
	222	{
	223	int ret;
	224
	225	ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
	226	usage_id,
	227	HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE,
	228	&st->press_attr);
	229	if (ret < 0)
	230	return ret;
	231	press_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESSURE,
	232	st->press_attr.size);
	233
	234	dev_dbg(&pdev->dev, "press %x:%x\n", st->press_attr.index,
	235	st->press_attr.report_id);
	236
a269b9a0 SP	237	st->scale_precision = hid_sensor_format_scale(
	238	HID_USAGE_SENSOR_PRESSURE,
	239	&st->press_attr,
	240	&st->scale_pre_decml, &st->scale_post_decml);
	241
f64a799b AP	242	/* Set Sensitivity field ids, when there is no individual modifier */
	243	if (st->common_attributes.sensitivity.index < 0) {
	244	sensor_hub_input_get_attribute_info(hsdev,
	245	HID_FEATURE_REPORT, usage_id,
	246	HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS \|
	247	HID_USAGE_SENSOR_DATA_ATMOSPHERIC_PRESSURE,
	248	&st->common_attributes.sensitivity);
	249	dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
	250	st->common_attributes.sensitivity.index,
	251	st->common_attributes.sensitivity.report_id);
	252	}
	253	return ret;
	254	}
	255
	256	/* Function to initialize the processing for usage id */
	257	static int hid_press_probe(struct platform_device *pdev)
	258	{
	259	int ret = 0;
	260	static const char *name = "press";
	261	struct iio_dev *indio_dev;
	262	struct press_state *press_state;
	263	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
f64a799b AP	264
	265	indio_dev = devm_iio_device_alloc(&pdev->dev,
	266	sizeof(struct press_state));
	267	if (!indio_dev)
	268	return -ENOMEM;
	269	platform_set_drvdata(pdev, indio_dev);
	270
	271	press_state = iio_priv(indio_dev);
	272	press_state->common_attributes.hsdev = hsdev;
	273	press_state->common_attributes.pdev = pdev;
	274
	275	ret = hid_sensor_parse_common_attributes(hsdev,
	276	HID_USAGE_SENSOR_PRESSURE,
	277	&press_state->common_attributes);
	278	if (ret) {
	279	dev_err(&pdev->dev, "failed to setup common attributes\n");
	280	return ret;
	281	}
	282
c24e7daf FE	283	indio_dev->channels = kmemdup(press_channels, sizeof(press_channels),
	284	GFP_KERNEL);
	285	if (!indio_dev->channels) {
f64a799b AP	286	dev_err(&pdev->dev, "failed to duplicate channels\n");
	287	return -ENOMEM;
	288	}
	289
c24e7daf FE	290	ret = press_parse_report(pdev, hsdev,
	291	(struct iio_chan_spec *)indio_dev->channels,
	292	HID_USAGE_SENSOR_PRESSURE, press_state);
f64a799b AP	293	if (ret) {
	294	dev_err(&pdev->dev, "failed to setup attributes\n");
	295	goto error_free_dev_mem;
	296	}
	297
f64a799b AP	298	indio_dev->num_channels =
	299	ARRAY_SIZE(press_channels);
	300	indio_dev->dev.parent = &pdev->dev;
	301	indio_dev->info = &press_info;
	302	indio_dev->name = name;
	303	indio_dev->modes = INDIO_DIRECT_MODE;
	304
	305	ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
	306	NULL, NULL);
	307	if (ret) {
	308	dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
	309	goto error_free_dev_mem;
	310	}
56ff6be6	311	atomic_set(&press_state->common_attributes.data_ready, 0);
f64a799b AP	312	ret = hid_sensor_setup_trigger(indio_dev, name,
	313	&press_state->common_attributes);
	314	if (ret) {
	315	dev_err(&pdev->dev, "trigger setup failed\n");
	316	goto error_unreg_buffer_funcs;
	317	}
	318
	319	ret = iio_device_register(indio_dev);
	320	if (ret) {
	321	dev_err(&pdev->dev, "device register failed\n");
	322	goto error_remove_trigger;
	323	}
	324
	325	press_state->callbacks.send_event = press_proc_event;
	326	press_state->callbacks.capture_sample = press_capture_sample;
	327	press_state->callbacks.pdev = pdev;
	328	ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PRESSURE,
	329	&press_state->callbacks);
	330	if (ret < 0) {
	331	dev_err(&pdev->dev, "callback reg failed\n");
	332	goto error_iio_unreg;
	333	}
	334
	335	return ret;
	336
	337	error_iio_unreg:
	338	iio_device_unregister(indio_dev);
	339	error_remove_trigger:
	340	hid_sensor_remove_trigger(&press_state->common_attributes);
	341	error_unreg_buffer_funcs:
	342	iio_triggered_buffer_cleanup(indio_dev);
	343	error_free_dev_mem:
	344	kfree(indio_dev->channels);
	345	return ret;
	346	}
	347
	348	/* Function to deinitialize the processing for usage id */
	349	static int hid_press_remove(struct platform_device *pdev)
	350	{
	351	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
	352	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
	353	struct press_state *press_state = iio_priv(indio_dev);
	354
	355	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PRESSURE);
	356	iio_device_unregister(indio_dev);
	357	hid_sensor_remove_trigger(&press_state->common_attributes);
	358	iio_triggered_buffer_cleanup(indio_dev);
	359	kfree(indio_dev->channels);
	360
	361	return 0;
	362	}
	363
85b4ba70	364	static const struct platform_device_id hid_press_ids[] = {
f64a799b AP	365	{
	366	/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
	367	.name = "HID-SENSOR-200031",
	368	},
	369	{ /* sentinel */ }
	370	};
	371	MODULE_DEVICE_TABLE(platform, hid_press_ids);
	372
	373	static struct platform_driver hid_press_platform_driver = {
	374	.id_table = hid_press_ids,
	375	.driver = {
	376	.name = KBUILD_MODNAME,
a77945fd	377	.pm = &hid_sensor_pm_ops,
f64a799b AP	378	},
	379	.probe = hid_press_probe,
	380	.remove = hid_press_remove,
	381	};
	382	module_platform_driver(hid_press_platform_driver);
	383
	384	MODULE_DESCRIPTION("HID Sensor Pressure");
	385	MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>");
	386	MODULE_LICENSE("GPL");