summaryrefslogtreecommitdiffstats
path: root/drivers/hid/hid-sensor-hub.c
blob: af8244b1c1f428dab026544802ca951089a02fd1 (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
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
/*
 * 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/hid.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/mfd/core.h>
#include <linux/list.h>
#include <linux/hid-sensor-ids.h>
#include <linux/hid-sensor-hub.h>
#include "hid-ids.h"

#define HID_SENSOR_HUB_ENUM_QUIRK	0x01

/**
 * struct sensor_hub_pending - Synchronous read pending information
 * @status:		Pending status true/false.
 * @ready:		Completion synchronization data.
 * @usage_id:		Usage id for physical device, E.g. Gyro usage id.
 * @attr_usage_id:	Usage Id of a field, E.g. X-AXIS for a gyro.
 * @raw_size:		Response size for a read request.
 * @raw_data:		Place holder for received response.
 */
struct sensor_hub_pending {
	bool status;
	struct completion ready;
	u32 usage_id;
	u32 attr_usage_id;
	int raw_size;
	u8  *raw_data;
};

/**
 * struct sensor_hub_data - Hold a instance data for a HID hub device
 * @hsdev:		Stored hid instance for current hub device.
 * @mutex:		Mutex to serialize synchronous request.
 * @lock:		Spin lock to protect pending request structure.
 * @pending:		Holds information of pending sync read request.
 * @dyn_callback_list:	Holds callback function
 * @dyn_callback_lock:	spin lock to protect callback list
 * @hid_sensor_hub_client_devs:	Stores all MFD cells for a hub instance.
 * @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached).
 * @ref_cnt:		Number of MFD clients have opened this device
 */
struct sensor_hub_data {
	struct mutex mutex;
	spinlock_t lock;
	struct sensor_hub_pending pending;
	struct list_head dyn_callback_list;
	spinlock_t dyn_callback_lock;
	struct mfd_cell *hid_sensor_hub_client_devs;
	int hid_sensor_client_cnt;
	unsigned long quirks;
	int ref_cnt;
};

/**
 * struct hid_sensor_hub_callbacks_list - Stores callback list
 * @list:		list head.
 * @usage_id:		usage id for a physical device.
 * @usage_callback:	Stores registered callback functions.
 * @priv:		Private data for a physical device.
 */
struct hid_sensor_hub_callbacks_list {
	struct list_head list;
	u32 usage_id;
	struct hid_sensor_hub_device *hsdev;
	struct hid_sensor_hub_callbacks *usage_callback;
	void *priv;
};

static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev,
						int dir)
{
	struct hid_report *report;

	list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) {
		if (report->id == id)
			return report;
	}
	hid_warn(hdev, "No report with id 0x%x found\n", id);

	return NULL;
}

static int sensor_hub_get_physical_device_count(struct hid_device *hdev)
{
	int i;
	int count = 0;

	for (i = 0; i < hdev->maxcollection; ++i) {
		struct hid_collection *collection = &hdev->collection[i];
		if (collection->type == HID_COLLECTION_PHYSICAL)
			++count;
	}

	return count;
}

static void sensor_hub_fill_attr_info(
		struct hid_sensor_hub_attribute_info *info,
		s32 index, s32 report_id, struct hid_field *field)
{
	info->index = index;
	info->report_id = report_id;
	info->units = field->unit;
	info->unit_expo = field->unit_exponent;
	info->size = (field->report_size * field->report_count)/8;
	info->logical_minimum = field->logical_minimum;
	info->logical_maximum = field->logical_maximum;
}

static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
					struct hid_device *hdev,
					u32 usage_id,
					int collection_index,
					struct hid_sensor_hub_device **hsdev,
					void **priv)
{
	struct hid_sensor_hub_callbacks_list *callback;
	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);

	spin_lock(&pdata->dyn_callback_lock);
	list_for_each_entry(callback, &pdata->dyn_callback_list, list)
		if (callback->usage_id == usage_id &&
			(collection_index >=
				callback->hsdev->start_collection_index) &&
			(collection_index <
				callback->hsdev->end_collection_index)) {
			*priv = callback->priv;
			*hsdev = callback->hsdev;
			spin_unlock(&pdata->dyn_callback_lock);
			return callback->usage_callback;
		}
	spin_unlock(&pdata->dyn_callback_lock);

	return NULL;
}

int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
			u32 usage_id,
			struct hid_sensor_hub_callbacks *usage_callback)
{
	struct hid_sensor_hub_callbacks_list *callback;
	struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);

	spin_lock(&pdata->dyn_callback_lock);
	list_for_each_entry(callback, &pdata->dyn_callback_list, list)
		if (callback->usage_id == usage_id &&
						callback->hsdev == hsdev) {
			spin_unlock(&pdata->dyn_callback_lock);
			return -EINVAL;
		}
	callback = kzalloc(sizeof(*callback), GFP_ATOMIC);
	if (!callback) {
		spin_unlock(&pdata->dyn_callback_lock);
		return -ENOMEM;
	}
	callback->hsdev = hsdev;
	callback->usage_callback = usage_callback;
	callback->usage_id = usage_id;
	callback->priv = NULL;
	list_add_tail(&callback->list, &pdata->dyn_callback_list);
	spin_unlock(&pdata->dyn_callback_lock);

	return 0;
}
EXPORT_SYMBOL_GPL(sensor_hub_register_callback);

int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
				u32 usage_id)
{
	struct hid_sensor_hub_callbacks_list *callback;
	struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);

	spin_lock(&pdata->dyn_callback_lock);
	list_for_each_entry(callback, &pdata->dyn_callback_list, list)
		if (callback->usage_id == usage_id &&
						callback->hsdev == hsdev) {
			list_del(&callback->list);
			kfree(callback);
			break;
		}
	spin_unlock(&pdata->dyn_callback_lock);

	return 0;
}
EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);

int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
				u32 field_index, s32 value)
{
	struct hid_report *report;
	struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
	int ret = 0;

	mutex_lock(&data->mutex);
	report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
	if (!report || (field_index >= report->maxfield)) {
		ret = -EINVAL;
		goto done_proc;
	}
	hid_set_field(report->field[field_index], 0, value);
	hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
	hid_hw_wait(hsdev->hdev);

done_proc:
	mutex_unlock(&data->mutex);

	return ret;
}
EXPORT_SYMBOL_GPL(sensor_hub_set_feature);

int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
				u32 field_index, s32 *value)
{
	struct hid_report *report;
	struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
	int ret = 0;

	mutex_lock(&data->mutex);
	report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
	if (!report || (field_index >= report->maxfield) ||
	    report->field[field_index]->report_count < 1) {
		ret = -EINVAL;
		goto done_proc;
	}
	hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
	hid_hw_wait(hsdev->hdev);
	*value = report->field[field_index]->value[0];

done_proc:
	mutex_unlock(&data->mutex);

	return ret;
}
EXPORT_SYMBOL_GPL(sensor_hub_get_feature);


int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
					u32 usage_id,
					u32 attr_usage_id, u32 report_id)
{
	struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
	unsigned long flags;
	struct hid_report *report;
	int ret_val = 0;

	mutex_lock(&data->mutex);
	memset(&data->pending, 0, sizeof(data->pending));
	init_completion(&data->pending.ready);
	data->pending.usage_id = usage_id;
	data->pending.attr_usage_id = attr_usage_id;
	data->pending.raw_size = 0;

	spin_lock_irqsave(&data->lock, flags);
	data->pending.status = true;
	spin_unlock_irqrestore(&data->lock, flags);
	report = sensor_hub_report(report_id, hsdev->hdev, HID_INPUT_REPORT);
	if (!report)
		goto err_free;

	hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
	wait_for_completion_interruptible_timeout(&data->pending.ready, HZ*5);
	switch (data->pending.raw_size) {
	case 1:
		ret_val = *(u8 *)data->pending.raw_data;
		break;
	case 2:
		ret_val = *(u16 *)data->pending.raw_data;
		break;
	case 4:
		ret_val = *(u32 *)data->pending.raw_data;
		break;
	default:
		ret_val = 0;
	}
	kfree(data->pending.raw_data);

err_free:
	data->pending.status = false;
	mutex_unlock(&data->mutex);

	return ret_val;
}
EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);

int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
				u32 report_id, int field_index, u32 usage_id)
{
	struct hid_report *report;
	struct hid_field *field;
	int i;

	report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
	if (!report || (field_index >= report->maxfield))
		goto done_proc;

	field = report->field[field_index];
	for (i = 0; i < field->maxusage; ++i) {
		if (field->usage[i].hid == usage_id)
			return field->usage[i].usage_index;
	}

done_proc:
	return -EINVAL;
}
EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);

int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
				u8 type,
				u32 usage_id,
				u32 attr_usage_id,
				struct hid_sensor_hub_attribute_info *info)
{
	int ret = -1;
	int i;
	struct hid_report *report;
	struct hid_field *field;
	struct hid_report_enum *report_enum;
	struct hid_device *hdev = hsdev->hdev;

	/* Initialize with defaults */
	info->usage_id = usage_id;
	info->attrib_id = attr_usage_id;
	info->report_id = -1;
	info->index = -1;
	info->units = -1;
	info->unit_expo = -1;

	report_enum = &hdev->report_enum[type];
	list_for_each_entry(report, &report_enum->report_list, list) {
		for (i = 0; i < report->maxfield; ++i) {
			field = report->field[i];
			if (field->maxusage) {
				if (field->physical == usage_id &&
					(field->logical == attr_usage_id ||
					field->usage[0].hid ==
							attr_usage_id) &&
					(field->usage[0].collection_index >=
					hsdev->start_collection_index) &&
					(field->usage[0].collection_index <
					hsdev->end_collection_index)) {

					sensor_hub_fill_attr_info(info, i,
								report->id,
								field);
					ret = 0;
					break;
				}
			}
		}

	}

	return ret;
}
EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);

#ifdef CONFIG_PM
static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
{
	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
	struct hid_sensor_hub_callbacks_list *callback;

	hid_dbg(hdev, " sensor_hub_suspend\n");
	spin_lock(&pdata->dyn_callback_lock);
	list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
		if (callback->usage_callback->suspend)
			callback->usage_callback->suspend(
					callback->hsdev, callback->priv);
	}
	spin_unlock(&pdata->dyn_callback_lock);

	return 0;
}

static int sensor_hub_resume(struct hid_device *hdev)
{
	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
	struct hid_sensor_hub_callbacks_list *callback;

	hid_dbg(hdev, " sensor_hub_resume\n");
	spin_lock(&pdata->dyn_callback_lock);
	list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
		if (callback->usage_callback->resume)
			callback->usage_callback->resume(
					callback->hsdev, callback->priv);
	}
	spin_unlock(&pdata->dyn_callback_lock);

	return 0;
}

static int sensor_hub_reset_resume(struct hid_device *hdev)
{
	return 0;
}
#endif

/*
 * Handle raw report as sent by device
 */
static int sensor_hub_raw_event(struct hid_device *hdev,
		struct hid_report *report, u8 *raw_data, int size)
{
	int i;
	u8 *ptr;
	int sz;
	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
	unsigned long flags;
	struct hid_sensor_hub_callbacks *callback = NULL;
	struct hid_collection *collection = NULL;
	void *priv = NULL;
	struct hid_sensor_hub_device *hsdev = NULL;

	hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
			 report->id, size, report->type);
	hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
	if (report->type != HID_INPUT_REPORT)
		return 1;

	ptr = raw_data;
	ptr++; /* Skip report id */

	spin_lock_irqsave(&pdata->lock, flags);

	for (i = 0; i < report->maxfield; ++i) {
		hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
				i, report->field[i]->usage->collection_index,
				report->field[i]->usage->hid,
				(report->field[i]->report_size *
					report->field[i]->report_count)/8);
		sz = (report->field[i]->report_size *
					report->field[i]->report_count)/8;
		if (pdata->pending.status && pdata->pending.attr_usage_id ==
				report->field[i]->usage->hid) {
			hid_dbg(hdev, "data was pending ...\n");
			pdata->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
			if (pdata->pending.raw_data)
				pdata->pending.raw_size = sz;
			else
				pdata->pending.raw_size = 0;
			complete(&pdata->pending.ready);
		}
		collection = &hdev->collection[
				report->field[i]->usage->collection_index];
		hid_dbg(hdev, "collection->usage %x\n",
					collection->usage);

		callback = sensor_hub_get_callback(hdev,
				report->field[i]->physical,
				report->field[i]->usage[0].collection_index,
				&hsdev, &priv);

		if (callback && callback->capture_sample) {
			if (report->field[i]->logical)
				callback->capture_sample(hsdev,
					report->field[i]->logical, sz, ptr,
					callback->pdev);
			else
				callback->capture_sample(hsdev,
					report->field[i]->usage->hid, sz, ptr,
					callback->pdev);
		}
		ptr += sz;
	}
	if (callback && collection && callback->send_event)
		callback->send_event(hsdev, collection->usage,
				callback->pdev);
	spin_unlock_irqrestore(&pdata->lock, flags);

	return 1;
}

int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
{
	int ret = 0;
	struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);

	mutex_lock(&data->mutex);
	if (!data->ref_cnt) {
		ret = hid_hw_open(hsdev->hdev);
		if (ret) {
			hid_err(hsdev->hdev, "failed to open hid device\n");
			mutex_unlock(&data->mutex);
			return ret;
		}
	}
	data->ref_cnt++;
	mutex_unlock(&data->mutex);

	return ret;
}
EXPORT_SYMBOL_GPL(sensor_hub_device_open);

void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
{
	struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);

	mutex_lock(&data->mutex);
	data->ref_cnt--;
	if (!data->ref_cnt)
		hid_hw_close(hsdev->hdev);
	mutex_unlock(&data->mutex);
}
EXPORT_SYMBOL_GPL(sensor_hub_device_close);

static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
		unsigned int *rsize)
{
	int index;
	struct sensor_hub_data *sd =  hid_get_drvdata(hdev);
	unsigned char report_block[] = {
				0x0a,  0x16, 0x03, 0x15, 0x00, 0x25, 0x05};
	unsigned char power_block[] = {
				0x0a,  0x19, 0x03, 0x15, 0x00, 0x25, 0x05};

	if (!(sd->quirks & HID_SENSOR_HUB_ENUM_QUIRK)) {
		hid_dbg(hdev, "No Enum quirks\n");
		return rdesc;
	}

	/* Looks for power and report state usage id and force to 1 */
	for (index = 0; index < *rsize; ++index) {
		if (((*rsize - index) > sizeof(report_block)) &&
			!memcmp(&rdesc[index], report_block,
						sizeof(report_block))) {
			rdesc[index + 4] = 0x01;
			index += sizeof(report_block);
		}
		if (((*rsize - index) > sizeof(power_block)) &&
			!memcmp(&rdesc[index], power_block,
						sizeof(power_block))) {
			rdesc[index + 4] = 0x01;
			index += sizeof(power_block);
		}
	}

	return rdesc;
}

static int sensor_hub_probe(struct hid_device *hdev,
				const struct hid_device_id *id)
{
	int ret;
	struct sensor_hub_data *sd;
	int i;
	char *name;
	int dev_cnt;
	struct hid_sensor_hub_device *hsdev;
	struct hid_sensor_hub_device *last_hsdev = NULL;

	sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
	if (!sd) {
		hid_err(hdev, "cannot allocate Sensor data\n");
		return -ENOMEM;
	}

	hid_set_drvdata(hdev, sd);
	sd->quirks = id->driver_data;

	spin_lock_init(&sd->lock);
	spin_lock_init(&sd->dyn_callback_lock);
	mutex_init(&sd->mutex);
	ret = hid_parse(hdev);
	if (ret) {
		hid_err(hdev, "parse failed\n");
		return ret;
	}
	INIT_LIST_HEAD(&hdev->inputs);

	ret = hid_hw_start(hdev, 0);
	if (ret) {
		hid_err(hdev, "hw start failed\n");
		return ret;
	}
	INIT_LIST_HEAD(&sd->dyn_callback_list);
	sd->hid_sensor_client_cnt = 0;

	dev_cnt = sensor_hub_get_physical_device_count(hdev);
	if (dev_cnt > HID_MAX_PHY_DEVICES) {
		hid_err(hdev, "Invalid Physical device count\n");
		ret = -EINVAL;
		goto err_stop_hw;
	}
	sd->hid_sensor_hub_client_devs = kzalloc(dev_cnt *
						sizeof(struct mfd_cell),
						GFP_KERNEL);
	if (sd->hid_sensor_hub_client_devs == NULL) {
		hid_err(hdev, "Failed to allocate memory for mfd cells\n");
			ret = -ENOMEM;
			goto err_stop_hw;
	}

	for (i = 0; i < hdev->maxcollection; ++i) {
		struct hid_collection *collection = &hdev->collection[i];

		if (collection->type == HID_COLLECTION_PHYSICAL) {

			hsdev = kzalloc(sizeof(*hsdev), GFP_KERNEL);
			if (!hsdev) {
				hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
				ret = -ENOMEM;
				goto err_no_mem;
			}
			hsdev->hdev = hdev;
			hsdev->vendor_id = hdev->vendor;
			hsdev->product_id = hdev->product;
			hsdev->start_collection_index = i;
			if (last_hsdev)
				last_hsdev->end_collection_index = i;
			last_hsdev = hsdev;
			name = kasprintf(GFP_KERNEL, "HID-SENSOR-%x",
					collection->usage);
			if (name == NULL) {
				hid_err(hdev, "Failed MFD device name\n");
					ret = -ENOMEM;
					goto err_no_mem;
			}
			sd->hid_sensor_hub_client_devs[
				sd->hid_sensor_client_cnt].id =
							PLATFORM_DEVID_AUTO;
			sd->hid_sensor_hub_client_devs[
				sd->hid_sensor_client_cnt].name = name;
			sd->hid_sensor_hub_client_devs[
				sd->hid_sensor_client_cnt].platform_data =
							hsdev;
			sd->hid_sensor_hub_client_devs[
				sd->hid_sensor_client_cnt].pdata_size =
							sizeof(*hsdev);
			hid_dbg(hdev, "Adding %s:%d\n", name,
					hsdev->start_collection_index);
			sd->hid_sensor_client_cnt++;
		}
	}
	if (last_hsdev)
		last_hsdev->end_collection_index = i;

	ret = mfd_add_devices(&hdev->dev, 0, sd->hid_sensor_hub_client_devs,
		sd->hid_sensor_client_cnt, NULL, 0, NULL);
	if (ret < 0)
		goto err_no_mem;

	return ret;

err_no_mem:
	for (i = 0; i < sd->hid_sensor_client_cnt; ++i) {
		kfree(sd->hid_sensor_hub_client_devs[i].name);
		kfree(sd->hid_sensor_hub_client_devs[i].platform_data);
	}
	kfree(sd->hid_sensor_hub_client_devs);
err_stop_hw:
	hid_hw_stop(hdev);

	return ret;
}

static void sensor_hub_remove(struct hid_device *hdev)
{
	struct sensor_hub_data *data = hid_get_drvdata(hdev);
	unsigned long flags;
	int i;

	hid_dbg(hdev, " hardware removed\n");
	hid_hw_close(hdev);
	hid_hw_stop(hdev);
	spin_lock_irqsave(&data->lock, flags);
	if (data->pending.status)
		complete(&data->pending.ready);
	spin_unlock_irqrestore(&data->lock, flags);
	mfd_remove_devices(&hdev->dev);
	for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
		kfree(data->hid_sensor_hub_client_devs[i].name);
		kfree(data->hid_sensor_hub_client_devs[i].platform_data);
	}
	kfree(data->hid_sensor_hub_client_devs);
	hid_set_drvdata(hdev, NULL);
	mutex_destroy(&data->mutex);
}

static const struct hid_device_id sensor_hub_devices[] = {
	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_0,
			USB_DEVICE_ID_INTEL_HID_SENSOR_0),
			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
			USB_DEVICE_ID_INTEL_HID_SENSOR_0),
			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
			USB_DEVICE_ID_INTEL_HID_SENSOR_1),
			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
			USB_DEVICE_ID_STM_HID_SENSOR),
			.driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
		     HID_ANY_ID) },
	{ }
};
MODULE_DEVICE_TABLE(hid, sensor_hub_devices);

static struct hid_driver sensor_hub_driver = {
	.name = "hid-sensor-hub",
	.id_table = sensor_hub_devices,
	.probe = sensor_hub_probe,
	.remove = sensor_hub_remove,
	.raw_event = sensor_hub_raw_event,
	.report_fixup = sensor_hub_report_fixup,
#ifdef CONFIG_PM
	.suspend = sensor_hub_suspend,
	.resume = sensor_hub_resume,
	.reset_resume = sensor_hub_reset_resume,
#endif
};
module_hid_driver(sensor_hub_driver);

MODULE_DESCRIPTION("HID Sensor Hub driver");
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
MODULE_LICENSE("GPL");