summaryrefslogtreecommitdiff
path: root/drivers/iio/magnetometer/hid-sensor-magn-3d.c
blob: a1fd9d591818741179e0b733fb47fea86d964a17 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
/*
 * 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 magn_3d_channel {
	CHANNEL_SCAN_INDEX_X,
	CHANNEL_SCAN_INDEX_Y,
	CHANNEL_SCAN_INDEX_Z,
	CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP,
	CHANNEL_SCAN_INDEX_NORTH_TRUE_TILT_COMP,
	CHANNEL_SCAN_INDEX_NORTH_MAGN,
	CHANNEL_SCAN_INDEX_NORTH_TRUE,
	MAGN_3D_CHANNEL_MAX,
};

struct common_attributes {
	int scale_pre_decml;
	int scale_post_decml;
	int scale_precision;
	int value_offset;
};

struct magn_3d_state {
	struct hid_sensor_hub_callbacks callbacks;
	struct hid_sensor_common magn_flux_attributes;
	struct hid_sensor_common rot_attributes;
	struct hid_sensor_hub_attribute_info magn[MAGN_3D_CHANNEL_MAX];

	/* dynamically sized array to hold sensor values */
	u32 *iio_vals;
	/* array of pointers to sensor value */
	u32 *magn_val_addr[MAGN_3D_CHANNEL_MAX];

	struct common_attributes magn_flux_attr;
	struct common_attributes rot_attr;
};

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,
	HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH,
	HID_USAGE_SENSOR_ORIENT_COMP_TRUE_NORTH,
	HID_USAGE_SENSOR_ORIENT_MAGN_NORTH,
	HID_USAGE_SENSOR_ORIENT_TRUE_NORTH,
};

/* Channel definitions */
static const struct iio_chan_spec magn_3d_channels[] = {
	{
		.type = IIO_MAGN,
		.modified = 1,
		.channel2 = IIO_MOD_X,
		.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),
	}, {
		.type = IIO_MAGN,
		.modified = 1,
		.channel2 = IIO_MOD_Y,
		.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),
	}, {
		.type = IIO_MAGN,
		.modified = 1,
		.channel2 = IIO_MOD_Z,
		.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),
	}, {
		.type = IIO_ROT,
		.modified = 1,
		.channel2 = IIO_MOD_NORTH_MAGN_TILT_COMP,
		.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),
	}, {
		.type = IIO_ROT,
		.modified = 1,
		.channel2 = IIO_MOD_NORTH_TRUE_TILT_COMP,
		.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),
	}, {
		.type = IIO_ROT,
		.modified = 1,
		.channel2 = IIO_MOD_NORTH_MAGN,
		.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),
	}, {
		.type = IIO_ROT,
		.modified = 1,
		.channel2 = IIO_MOD_NORTH_TRUE,
		.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),
	}
};

/* 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_type;

	*val = 0;
	*val2 = 0;
	switch (mask) {
	case 0:
		hid_sensor_power_state(&magn_state->magn_flux_attributes, true);
		report_id =
			magn_state->magn[chan->address].report_id;
		address = magn_3d_addresses[chan->address];
		if (report_id >= 0)
			*val = sensor_hub_input_attr_get_raw_value(
				magn_state->magn_flux_attributes.hsdev,
				HID_USAGE_SENSOR_COMPASS_3D, address,
				report_id,
				SENSOR_HUB_SYNC);
		else {
			*val = 0;
			hid_sensor_power_state(
				&magn_state->magn_flux_attributes,
				false);
			return -EINVAL;
		}
		hid_sensor_power_state(&magn_state->magn_flux_attributes,
					false);
		ret_type = IIO_VAL_INT;
		break;
	case IIO_CHAN_INFO_SCALE:
		switch (chan->type) {
		case IIO_MAGN:
			*val = magn_state->magn_flux_attr.scale_pre_decml;
			*val2 = magn_state->magn_flux_attr.scale_post_decml;
			ret_type = magn_state->magn_flux_attr.scale_precision;
			break;
		case IIO_ROT:
			*val = magn_state->rot_attr.scale_pre_decml;
			*val2 = magn_state->rot_attr.scale_post_decml;
			ret_type = magn_state->rot_attr.scale_precision;
			break;
		default:
			ret_type = -EINVAL;
		}
		break;
	case IIO_CHAN_INFO_OFFSET:
		switch (chan->type) {
		case IIO_MAGN:
			*val = magn_state->magn_flux_attr.value_offset;
			ret_type = IIO_VAL_INT;
			break;
		case IIO_ROT:
			*val = magn_state->rot_attr.value_offset;
			ret_type = IIO_VAL_INT;
			break;
		default:
			ret_type = -EINVAL;
		}
		break;
	case IIO_CHAN_INFO_SAMP_FREQ:
		ret_type = hid_sensor_read_samp_freq_value(
			&magn_state->magn_flux_attributes, val, val2);
		break;
	case IIO_CHAN_INFO_HYSTERESIS:
		switch (chan->type) {
		case IIO_MAGN:
			ret_type = hid_sensor_read_raw_hyst_value(
				&magn_state->magn_flux_attributes, val, val2);
			break;
		case IIO_ROT:
			ret_type = hid_sensor_read_raw_hyst_value(
				&magn_state->rot_attributes, val, val2);
			break;
		default:
			ret_type = -EINVAL;
		}
		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->magn_flux_attributes, val, val2);
		break;
	case IIO_CHAN_INFO_HYSTERESIS:
		switch (chan->type) {
		case IIO_MAGN:
			ret = hid_sensor_write_raw_hyst_value(
				&magn_state->magn_flux_attributes, val, val2);
			break;
		case IIO_ROT:
			ret = hid_sensor_write_raw_hyst_value(
				&magn_state->rot_attributes, val, val2);
			break;
		default:
			ret = -EINVAL;
		}
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static const struct iio_info magn_3d_info = {
	.read_raw = &magn_3d_read_raw,
	.write_raw = &magn_3d_write_raw,
};

/* Function to push data to buffer */
static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data)
{
	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 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\n");
	if (atomic_read(&magn_state->magn_flux_attributes.data_ready))
		hid_sensor_push_data(indio_dev, magn_state->iio_vals);

	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 = 0;
	u32 *iio_val = NULL;

	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)
				+ CHANNEL_SCAN_INDEX_X;
	break;
	case HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH:
	case HID_USAGE_SENSOR_ORIENT_COMP_TRUE_NORTH:
	case HID_USAGE_SENSOR_ORIENT_MAGN_NORTH:
	case HID_USAGE_SENSOR_ORIENT_TRUE_NORTH:
		offset = (usage_id - HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH)
				+ CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP;
	break;
	default:
		return -EINVAL;
	}

	iio_val = magn_state->magn_val_addr[offset];

	if (iio_val != NULL)
		*iio_val = *((u32 *)raw_data);
	else
		ret = -EINVAL;

	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,
				int *chan_count,
				unsigned usage_id,
				struct magn_3d_state *st)
{
	int i;
	int attr_count = 0;
	struct iio_chan_spec *_channels;

	/* Scan for each usage attribute supported */
	for (i = 0; i < MAGN_3D_CHANNEL_MAX; i++) {
		int status;
		u32 address = magn_3d_addresses[i];

		/* Check if usage attribute exists in the sensor hub device */
		status = sensor_hub_input_get_attribute_info(hsdev,
			HID_INPUT_REPORT,
			usage_id,
			address,
			&(st->magn[i]));
		if (!status)
			attr_count++;
	}

	if (attr_count <= 0) {
		dev_err(&pdev->dev,
			"failed to find any supported usage attributes in report\n");
		return  -EINVAL;
	}

	dev_dbg(&pdev->dev, "magn_3d Found %d usage attributes\n",
			attr_count);
	dev_dbg(&pdev->dev, "magn_3d X: %x:%x Y: %x:%x Z: %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);

	/* Setup IIO channel array */
	_channels = devm_kcalloc(&pdev->dev, attr_count,
				sizeof(struct iio_chan_spec),
				GFP_KERNEL);
	if (!_channels) {
		dev_err(&pdev->dev,
			"failed to allocate space for iio channels\n");
		return -ENOMEM;
	}

	st->iio_vals = devm_kcalloc(&pdev->dev, attr_count,
				sizeof(u32),
				GFP_KERNEL);
	if (!st->iio_vals) {
		dev_err(&pdev->dev,
			"failed to allocate space for iio values array\n");
		return -ENOMEM;
	}

	for (i = 0, *chan_count = 0;
	i < MAGN_3D_CHANNEL_MAX && *chan_count < attr_count;
	i++){
		if (st->magn[i].index >= 0) {
			/* Setup IIO channel struct */
			(_channels[*chan_count]) = magn_3d_channels[i];
			(_channels[*chan_count]).scan_index = *chan_count;
			(_channels[*chan_count]).address = i;

			/* Set magn_val_addr to iio value address */
			st->magn_val_addr[i] = &(st->iio_vals[*chan_count]);
			magn_3d_adjust_channel_bit_mask(_channels,
							*chan_count,
							st->magn[i].size);
			(*chan_count)++;
		}
	}

	if (*chan_count <= 0) {
		dev_err(&pdev->dev,
			"failed to find any magnetic channels setup\n");
		return -EINVAL;
	}

	*channels = _channels;

	dev_dbg(&pdev->dev, "magn_3d Setup %d IIO channels\n",
			*chan_count);

	st->magn_flux_attr.scale_precision = hid_sensor_format_scale(
				HID_USAGE_SENSOR_COMPASS_3D,
				&st->magn[CHANNEL_SCAN_INDEX_X],
				&st->magn_flux_attr.scale_pre_decml,
				&st->magn_flux_attr.scale_post_decml);
	st->rot_attr.scale_precision
		= hid_sensor_format_scale(
			HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH,
			&st->magn[CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP],
			&st->rot_attr.scale_pre_decml,
			&st->rot_attr.scale_post_decml);

	/* Set Sensitivity field ids, when there is no individual modifier */
	if (st->magn_flux_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_ORIENTATION,
			&st->magn_flux_attributes.sensitivity);
		dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
			st->magn_flux_attributes.sensitivity.index,
			st->magn_flux_attributes.sensitivity.report_id);
	}
	if (st->magn_flux_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_ORIENT_MAGN_FLUX,
			&st->magn_flux_attributes.sensitivity);
		dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
			st->magn_flux_attributes.sensitivity.index,
			st->magn_flux_attributes.sensitivity.report_id);
	}
	if (st->rot_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_ORIENT_COMP_MAGN_NORTH,
			&st->rot_attributes.sensitivity);
		dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
			st->rot_attributes.sensitivity.index,
			st->rot_attributes.sensitivity.report_id);
	}

	return 0;
}

/* 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;
	int chan_count = 0;

	indio_dev = devm_iio_device_alloc(&pdev->dev,
					  sizeof(struct magn_3d_state));
	if (indio_dev == NULL)
		return -ENOMEM;

	platform_set_drvdata(pdev, indio_dev);

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

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

	ret = magn_3d_parse_report(pdev, hsdev,
				&channels, &chan_count,
				HID_USAGE_SENSOR_COMPASS_3D, magn_state);
	if (ret) {
		dev_err(&pdev->dev, "failed to parse report\n");
		return ret;
	}

	indio_dev->channels = channels;
	indio_dev->num_channels = chan_count;
	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");
		return ret;
	}
	atomic_set(&magn_state->magn_flux_attributes.data_ready, 0);
	ret = hid_sensor_setup_trigger(indio_dev, name,
					&magn_state->magn_flux_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(&magn_state->magn_flux_attributes);
error_unreg_buffer_funcs:
	iio_triggered_buffer_cleanup(indio_dev);
	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);
	struct magn_3d_state *magn_state = iio_priv(indio_dev);

	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_COMPASS_3D);
	iio_device_unregister(indio_dev);
	hid_sensor_remove_trigger(&magn_state->magn_flux_attributes);
	iio_triggered_buffer_cleanup(indio_dev);

	return 0;
}

static const struct platform_device_id hid_magn_3d_ids[] = {
	{
		/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
		.name = "HID-SENSOR-200083",
	},
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, hid_magn_3d_ids);

static struct platform_driver hid_magn_3d_platform_driver = {
	.id_table = hid_magn_3d_ids,
	.driver = {
		.name	= KBUILD_MODNAME,
		.pm	= &hid_sensor_pm_ops,
	},
	.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");