[linux-2.6-block.git] / drivers / iio / magnetometer / hid-sensor-magn-3d.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 Magnetometer-3D: 0x200083*/
#define DRIVER_NAME "HID-SENSOR-200083"

enum magn_3d_channel {
	CHANNEL_SCAN_INDEX_X,
	CHANNEL_SCAN_INDEX_Y,
	CHANNEL_SCAN_INDEX_Z,
	MAGN_3D_CHANNEL_MAX,
};

struct magn_3d_state {
	struct hid_sensor_hub_callbacks callbacks;
	struct hid_sensor_iio_common common_attributes;
	struct hid_sensor_hub_attribute_info magn[MAGN_3D_CHANNEL_MAX];
	u32 magn_val[MAGN_3D_CHANNEL_MAX];
};

static const u32 magn_3d_addresses[MAGN_3D_CHANNEL_MAX] = {
	HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS,
	HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS,
	HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS
};

/* Channel definitions */
static const struct iio_chan_spec magn_3d_channels[] = {
	{
		.type = IIO_MAGN,
		.modified = 1,
		.channel2 = IIO_MOD_X,
		.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_X,
	}, {
		.type = IIO_MAGN,
		.modified = 1,
		.channel2 = IIO_MOD_Y,
		.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_Y,
	}, {
		.type = IIO_MAGN,
		.modified = 1,
		.channel2 = IIO_MOD_Z,
		.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_Z,
	}
};

/* Adjust channel real bits based on report descriptor */
static void magn_3d_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 magn_3d_read_raw(struct iio_dev *indio_dev,
			      struct iio_chan_spec const *chan,
			      int *val, int *val2,
			      long mask)
{
	struct magn_3d_state *magn_state = iio_priv(indio_dev);
	int report_id = -1;
	u32 address;
	int ret;
	int ret_type;

	*val = 0;
	*val2 = 0;
	switch (mask) {
	case 0:
		report_id =
			magn_state->magn[chan->scan_index].report_id;
		address = magn_3d_addresses[chan->scan_index];
		if (report_id >= 0)
			*val = sensor_hub_input_attr_get_raw_value(
				magn_state->common_attributes.hsdev,
				HID_USAGE_SENSOR_COMPASS_3D, address,
				report_id);
		else {
			*val = 0;
			return -EINVAL;
		}
		ret_type = IIO_VAL_INT;
		break;
	case IIO_CHAN_INFO_SCALE:
		*val = magn_state->magn[CHANNEL_SCAN_INDEX_X].units;
		ret_type = IIO_VAL_INT;
		break;
	case IIO_CHAN_INFO_OFFSET:
		*val = hid_sensor_convert_exponent(
			magn_state->magn[CHANNEL_SCAN_INDEX_X].unit_expo);
		ret_type = IIO_VAL_INT;
		break;
	case IIO_CHAN_INFO_SAMP_FREQ:
		ret = hid_sensor_read_samp_freq_value(
			&magn_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(
			&magn_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 magn_3d_write_raw(struct iio_dev *indio_dev,
			       struct iio_chan_spec const *chan,
			       int val,
			       int val2,
			       long mask)
{
	struct magn_3d_state *magn_state = iio_priv(indio_dev);
	int ret = 0;

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

	return ret;
}

static int magn_3d_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 magn_3d_info = {
	.driver_module = THIS_MODULE,
	.read_raw = &magn_3d_read_raw,
	.write_raw = &magn_3d_write_raw,
	.write_raw_get_fmt = &magn_3d_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 magn_3d_proc_event(struct hid_sensor_hub_device *hsdev,
				unsigned usage_id,
				void *priv)
{
	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	struct magn_3d_state *magn_state = iio_priv(indio_dev);

	dev_dbg(&indio_dev->dev, "magn_3d_proc_event [%d]\n",
				magn_state->common_attributes.data_ready);
	if (magn_state->common_attributes.data_ready)
		hid_sensor_push_data(indio_dev,
				(u8 *)magn_state->magn_val,
				sizeof(magn_state->magn_val));

	return 0;
}

/* Capture samples in local storage */
static int magn_3d_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 magn_3d_state *magn_state = iio_priv(indio_dev);
	int offset;
	int ret = -EINVAL;

	switch (usage_id) {
	case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS:
	case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS:
	case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS:
		offset = usage_id - HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS;
		magn_state->magn_val[CHANNEL_SCAN_INDEX_X + offset] =
						*(u32 *)raw_data;
		ret = 0;
	break;
	default:
		break;
	}

	return ret;
}

/* Parse report which is specific to an usage id*/
static int magn_3d_parse_report(struct platform_device *pdev,
				struct hid_sensor_hub_device *hsdev,
				struct iio_chan_spec *channels,
				unsigned usage_id,
				struct magn_3d_state *st)
{
	int ret;
	int i;

	for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) {
		ret = sensor_hub_input_get_attribute_info(hsdev,
				HID_INPUT_REPORT,
				usage_id,
				HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS + i,
				&st->magn[CHANNEL_SCAN_INDEX_X + i]);
		if (ret < 0)
			break;
		magn_3d_adjust_channel_bit_mask(channels,
				CHANNEL_SCAN_INDEX_X + i,
				st->magn[CHANNEL_SCAN_INDEX_X + i].size);
	}
	dev_dbg(&pdev->dev, "magn_3d %x:%x, %x:%x, %x:%x\n",
			st->magn[0].index,
			st->magn[0].report_id,
			st->magn[1].index, st->magn[1].report_id,
			st->magn[2].index, st->magn[2].report_id);

	return ret;
}

/* Function to initialize the processing for usage id */
static int hid_magn_3d_probe(struct platform_device *pdev)
{
	int ret = 0;
	static char *name = "magn_3d";
	struct iio_dev *indio_dev;
	struct magn_3d_state *magn_state;
	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
	struct iio_chan_spec *channels;

	indio_dev = iio_device_alloc(sizeof(struct magn_3d_state));
	if (indio_dev == NULL) {
		ret = -ENOMEM;
		goto error_ret;
	}
	platform_set_drvdata(pdev, indio_dev);

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

	ret = hid_sensor_parse_common_attributes(hsdev,
				HID_USAGE_SENSOR_COMPASS_3D,
				&magn_state->common_attributes);
	if (ret) {
		dev_err(&pdev->dev, "failed to setup common attributes\n");
		goto error_free_dev;
	}

	channels = kmemdup(magn_3d_channels, sizeof(magn_3d_channels),
			   GFP_KERNEL);
	if (!channels) {
		ret = -ENOMEM;
		dev_err(&pdev->dev, "failed to duplicate channels\n");
		goto error_free_dev;
	}

	ret = magn_3d_parse_report(pdev, hsdev, channels,
				HID_USAGE_SENSOR_COMPASS_3D, magn_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(magn_3d_channels);
	indio_dev->dev.parent = &pdev->dev;
	indio_dev->info = &magn_3d_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;
	}
	magn_state->common_attributes.data_ready = false;
	ret = hid_sensor_setup_trigger(indio_dev, name,
					&magn_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;
	}

	magn_state->callbacks.send_event = magn_3d_proc_event;
	magn_state->callbacks.capture_sample = magn_3d_capture_sample;
	magn_state->callbacks.pdev = pdev;
	ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_COMPASS_3D,
					&magn_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_magn_3d_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_COMPASS_3D);
	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_magn_3d_platform_driver = {
	.driver = {
		.name	= DRIVER_NAME,
		.owner	= THIS_MODULE,
	},
	.probe		= hid_magn_3d_probe,
	.remove		= hid_magn_3d_remove,
};
module_platform_driver(hid_magn_3d_platform_driver);

MODULE_DESCRIPTION("HID Sensor Magnetometer 3D");
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
bc1d57ba	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 Magnetometer-3D: 0x200083/
	36	#define DRIVER_NAME "HID-SENSOR-200083"
	37
	38	enum magn_3d_channel {
	39	CHANNEL_SCAN_INDEX_X,
	40	CHANNEL_SCAN_INDEX_Y,
	41	CHANNEL_SCAN_INDEX_Z,
	42	MAGN_3D_CHANNEL_MAX,
	43	};
	44
	45	struct magn_3d_state {
	46	struct hid_sensor_hub_callbacks callbacks;
	47	struct hid_sensor_iio_common common_attributes;
	48	struct hid_sensor_hub_attribute_info magn[MAGN_3D_CHANNEL_MAX];
	49	u32 magn_val[MAGN_3D_CHANNEL_MAX];
	50	};
	51
	52	static const u32 magn_3d_addresses[MAGN_3D_CHANNEL_MAX] = {
	53	HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS,
	54	HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS,
	55	HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS
	56	};
	57
	58	/* Channel definitions */
	59	static const struct iio_chan_spec magn_3d_channels[] = {
	60	{
	61	.type = IIO_MAGN,
	62	.modified = 1,
	63	.channel2 = IIO_MOD_X,
	64	.info_mask = IIO_CHAN_INFO_OFFSET_SHARED_BIT \|
65	IIO_CHAN_INFO_SCALE_SHARED_BIT \|
66	IIO_CHAN_INFO_SAMP_FREQ_SHARED_BIT \|
67	IIO_CHAN_INFO_HYSTERESIS_SHARED_BIT,
68	.scan_index = CHANNEL_SCAN_INDEX_X,
69	}, {
70	.type = IIO_MAGN,
71	.modified = 1,
72	.channel2 = IIO_MOD_Y,
73	.info_mask = IIO_CHAN_INFO_OFFSET_SHARED_BIT \|
74	IIO_CHAN_INFO_SCALE_SHARED_BIT \|
75	IIO_CHAN_INFO_SAMP_FREQ_SHARED_BIT \|
76	IIO_CHAN_INFO_HYSTERESIS_SHARED_BIT,
77	.scan_index = CHANNEL_SCAN_INDEX_Y,
78	}, {
79	.type = IIO_MAGN,
80	.modified = 1,
81	.channel2 = IIO_MOD_Z,
82	.info_mask = IIO_CHAN_INFO_OFFSET_SHARED_BIT \|
83	IIO_CHAN_INFO_SCALE_SHARED_BIT \|
84	IIO_CHAN_INFO_SAMP_FREQ_SHARED_BIT \|
85	IIO_CHAN_INFO_HYSTERESIS_SHARED_BIT,
86	.scan_index = CHANNEL_SCAN_INDEX_Z,
87	}
88	};
89
90	/* Adjust channel real bits based on report descriptor */
91	static void magn_3d_adjust_channel_bit_mask(struct iio_chan_spec *channels,
92	int channel, int size)
93	{
94	channels[channel].scan_type.sign = 's';
95	/* Real storage bits will change based on the report desc. */
96	channels[channel].scan_type.realbits = size * 8;
97	/* Maximum size of a sample to capture is u32 */
98	channels[channel].scan_type.storagebits = sizeof(u32) * 8;
99	}
100
101	/* Channel read_raw handler */
102	static int magn_3d_read_raw(struct iio_dev *indio_dev,
103	struct iio_chan_spec const *chan,
104	int val, int val2,
105	long mask)
106	{
107	struct magn_3d_state *magn_state = iio_priv(indio_dev);
108	int report_id = -1;
109	u32 address;
110	int ret;
111	int ret_type;
112
113	*val = 0;
114	*val2 = 0;
115	switch (mask) {
116	case 0:
117	report_id =
118	magn_state->magn[chan->scan_index].report_id;
119	address = magn_3d_addresses[chan->scan_index];
120	if (report_id >= 0)
121	*val = sensor_hub_input_attr_get_raw_value(
122	magn_state->common_attributes.hsdev,
123	HID_USAGE_SENSOR_COMPASS_3D, address,
124	report_id);
125	else {
126	*val = 0;
127	return -EINVAL;
128	}
129	ret_type = IIO_VAL_INT;
130	break;
131	case IIO_CHAN_INFO_SCALE:
132	*val = magn_state->magn[CHANNEL_SCAN_INDEX_X].units;
133	ret_type = IIO_VAL_INT;
134	break;
135	case IIO_CHAN_INFO_OFFSET:
136	*val = hid_sensor_convert_exponent(
137	magn_state->magn[CHANNEL_SCAN_INDEX_X].unit_expo);
138	ret_type = IIO_VAL_INT;
139	break;
140	case IIO_CHAN_INFO_SAMP_FREQ:
141	ret = hid_sensor_read_samp_freq_value(
142	&magn_state->common_attributes, val, val2);
143	ret_type = IIO_VAL_INT_PLUS_MICRO;
144	break;
145	case IIO_CHAN_INFO_HYSTERESIS:
146	ret = hid_sensor_read_raw_hyst_value(
147	&magn_state->common_attributes, val, val2);
148	ret_type = IIO_VAL_INT_PLUS_MICRO;
149	break;
150	default:
151	ret_type = -EINVAL;
152	break;
153	}
154
155	return ret_type;
156	}
157
158	/* Channel write_raw handler */
159	static int magn_3d_write_raw(struct iio_dev *indio_dev,
160	struct iio_chan_spec const *chan,
161	int val,
162	int val2,
163	long mask)
164	{
165	struct magn_3d_state *magn_state = iio_priv(indio_dev);
166	int ret = 0;
167
168	switch (mask) {
169	case IIO_CHAN_INFO_SAMP_FREQ:
170	ret = hid_sensor_write_samp_freq_value(
171	&magn_state->common_attributes, val, val2);
172	break;
173	case IIO_CHAN_INFO_HYSTERESIS:
174	ret = hid_sensor_write_raw_hyst_value(
175	&magn_state->common_attributes, val, val2);
176	break;
177	default:
178	ret = -EINVAL;
179	}
180
181	return ret;
182	}
183
184	static int magn_3d_write_raw_get_fmt(struct iio_dev *indio_dev,
185	struct iio_chan_spec const *chan,
186	long mask)
187	{
188	return IIO_VAL_INT_PLUS_MICRO;
189	}
190
191	static const struct iio_info magn_3d_info = {
192	.driver_module = THIS_MODULE,
193	.read_raw = &magn_3d_read_raw,
194	.write_raw = &magn_3d_write_raw,
195	.write_raw_get_fmt = &magn_3d_write_raw_get_fmt,
196	};
197
198	/* Function to push data to buffer */
199	static void hid_sensor_push_data(struct iio_dev indio_dev, u8 data, int len)
200	{
bc1d57ba	201	dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
84b36ce5	202	iio_push_to_buffers(indio_dev, (u8 *)data);
bc1d57ba	203	}
	204
	205	/* Callback handler to send event after all samples are received and captured */
	206	static int magn_3d_proc_event(struct hid_sensor_hub_device *hsdev,
	207	unsigned usage_id,
	208	void *priv)
	209	{
	210	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	211	struct magn_3d_state *magn_state = iio_priv(indio_dev);
	212
	213	dev_dbg(&indio_dev->dev, "magn_3d_proc_event [%d]\n",
	214	magn_state->common_attributes.data_ready);
	215	if (magn_state->common_attributes.data_ready)
	216	hid_sensor_push_data(indio_dev,
	217	(u8 *)magn_state->magn_val,
	218	sizeof(magn_state->magn_val));
	219
	220	return 0;
	221	}
	222
	223	/* Capture samples in local storage */
	224	static int magn_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
	225	unsigned usage_id,
	226	size_t raw_len, char *raw_data,
	227	void *priv)
	228	{
	229	struct iio_dev *indio_dev = platform_get_drvdata(priv);
	230	struct magn_3d_state *magn_state = iio_priv(indio_dev);
	231	int offset;
	232	int ret = -EINVAL;
	233
	234	switch (usage_id) {
	235	case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS:
	236	case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS:
	237	case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS:
	238	offset = usage_id - HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS;
	239	magn_state->magn_val[CHANNEL_SCAN_INDEX_X + offset] =
	240	(u32 )raw_data;
	241	ret = 0;
	242	break;
	243	default:
	244	break;
	245	}
	246
	247	return ret;
	248	}
	249
	250	/* Parse report which is specific to an usage id*/
	251	static int magn_3d_parse_report(struct platform_device *pdev,
	252	struct hid_sensor_hub_device *hsdev,
	253	struct iio_chan_spec *channels,
	254	unsigned usage_id,
	255	struct magn_3d_state *st)
	256	{
	257	int ret;
	258	int i;
	259
	260	for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) {
	261	ret = sensor_hub_input_get_attribute_info(hsdev,
	262	HID_INPUT_REPORT,
	263	usage_id,
	264	HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS + i,
	265	&st->magn[CHANNEL_SCAN_INDEX_X + i]);
	266	if (ret < 0)
267	break;
268	magn_3d_adjust_channel_bit_mask(channels,
269	CHANNEL_SCAN_INDEX_X + i,
270	st->magn[CHANNEL_SCAN_INDEX_X + i].size);
271	}
272	dev_dbg(&pdev->dev, "magn_3d %x:%x, %x:%x, %x:%x\n",
273	st->magn[0].index,
274	st->magn[0].report_id,
275	st->magn[1].index, st->magn[1].report_id,
276	st->magn[2].index, st->magn[2].report_id);
277
278	return ret;
279	}
280
281	/* Function to initialize the processing for usage id */
fc52692c	282	static int hid_magn_3d_probe(struct platform_device *pdev)
bc1d57ba	283	{
	284	int ret = 0;
	285	static char *name = "magn_3d";
	286	struct iio_dev *indio_dev;
	287	struct magn_3d_state *magn_state;
	288	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
	289	struct iio_chan_spec *channels;
	290
	291	indio_dev = iio_device_alloc(sizeof(struct magn_3d_state));
	292	if (indio_dev == NULL) {
	293	ret = -ENOMEM;
	294	goto error_ret;
	295	}
	296	platform_set_drvdata(pdev, indio_dev);
	297
	298	magn_state = iio_priv(indio_dev);
	299	magn_state->common_attributes.hsdev = hsdev;
	300	magn_state->common_attributes.pdev = pdev;
	301
	302	ret = hid_sensor_parse_common_attributes(hsdev,
	303	HID_USAGE_SENSOR_COMPASS_3D,
	304	&magn_state->common_attributes);
	305	if (ret) {
	306	dev_err(&pdev->dev, "failed to setup common attributes\n");
	307	goto error_free_dev;
	308	}
	309
64ebe955 AL	310	channels = kmemdup(magn_3d_channels, sizeof(magn_3d_channels),
64ebe955 AL	311	GFP_KERNEL);
bc1d57ba	312	if (!channels) {
64ebe955	313	ret = -ENOMEM;
bc1d57ba	314	dev_err(&pdev->dev, "failed to duplicate channels\n");
	315	goto error_free_dev;
	316	}
	317
	318	ret = magn_3d_parse_report(pdev, hsdev, channels,
	319	HID_USAGE_SENSOR_COMPASS_3D, magn_state);
	320	if (ret) {
	321	dev_err(&pdev->dev, "failed to setup attributes\n");
	322	goto error_free_dev_mem;
	323	}
	324
	325	indio_dev->channels = channels;
	326	indio_dev->num_channels = ARRAY_SIZE(magn_3d_channels);
	327	indio_dev->dev.parent = &pdev->dev;
	328	indio_dev->info = &magn_3d_info;
	329	indio_dev->name = name;
	330	indio_dev->modes = INDIO_DIRECT_MODE;
	331
	332	ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
	333	NULL, NULL);
	334	if (ret) {
	335	dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
	336	goto error_free_dev_mem;
	337	}
	338	magn_state->common_attributes.data_ready = false;
	339	ret = hid_sensor_setup_trigger(indio_dev, name,
	340	&magn_state->common_attributes);
	341	if (ret < 0) {
	342	dev_err(&pdev->dev, "trigger setup failed\n");
	343	goto error_unreg_buffer_funcs;
	344	}
	345
	346	ret = iio_device_register(indio_dev);
	347	if (ret) {
	348	dev_err(&pdev->dev, "device register failed\n");
	349	goto error_remove_trigger;
	350	}
	351
	352	magn_state->callbacks.send_event = magn_3d_proc_event;
	353	magn_state->callbacks.capture_sample = magn_3d_capture_sample;
	354	magn_state->callbacks.pdev = pdev;
	355	ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_COMPASS_3D,
	356	&magn_state->callbacks);
	357	if (ret < 0) {
	358	dev_err(&pdev->dev, "callback reg failed\n");
	359	goto error_iio_unreg;
	360	}
	361
	362	return ret;
	363
	364	error_iio_unreg:
	365	iio_device_unregister(indio_dev);
	366	error_remove_trigger:
	367	hid_sensor_remove_trigger(indio_dev);
	368	error_unreg_buffer_funcs:
	369	iio_triggered_buffer_cleanup(indio_dev);
	370	error_free_dev_mem:
	371	kfree(indio_dev->channels);
	372	error_free_dev:
	373	iio_device_free(indio_dev);
	374	error_ret:
	375	return ret;
	376	}
	377
378	/* Function to deinitialize the processing for usage id */
fc52692c	379	static int hid_magn_3d_remove(struct platform_device *pdev)
bc1d57ba	380	{
	381	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
	382	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
	383
	384	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_COMPASS_3D);
	385	iio_device_unregister(indio_dev);
	386	hid_sensor_remove_trigger(indio_dev);
	387	iio_triggered_buffer_cleanup(indio_dev);
	388	kfree(indio_dev->channels);
	389	iio_device_free(indio_dev);
	390
	391	return 0;
	392	}
	393
	394	static struct platform_driver hid_magn_3d_platform_driver = {
	395	.driver = {
	396	.name = DRIVER_NAME,
	397	.owner = THIS_MODULE,
	398	},
	399	.probe = hid_magn_3d_probe,
	400	.remove = hid_magn_3d_remove,
	401	};
	402	module_platform_driver(hid_magn_3d_platform_driver);
	403
	404	MODULE_DESCRIPTION("HID Sensor Magnetometer 3D");
	405	MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
	406	MODULE_LICENSE("GPL");