aboutsummaryrefslogtreecommitdiff
path: root/drivers/hid/hid-sensor-custom.c
blob: e8a114157f87b81593225469dbb7f838cb450480 (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
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
/*
 * hid-sensor-custom.c
 * Copyright (c) 2015, 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.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/miscdevice.h>
#include <linux/kfifo.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/poll.h>
#include <linux/bsearch.h>
#include <linux/platform_device.h>
#include <linux/hid-sensor-hub.h>

#define HID_CUSTOM_NAME_LENGTH		64
#define HID_CUSTOM_MAX_CORE_ATTRS	10
#define HID_CUSTOM_TOTAL_ATTRS		(HID_CUSTOM_MAX_CORE_ATTRS + 1)
#define HID_CUSTOM_FIFO_SIZE		4096
#define HID_CUSTOM_MAX_FEATURE_BYTES	64

struct hid_sensor_custom_field {
	int report_id;
	char group_name[HID_CUSTOM_NAME_LENGTH];
	struct hid_sensor_hub_attribute_info attribute;
	struct device_attribute sd_attrs[HID_CUSTOM_MAX_CORE_ATTRS];
	char attr_name[HID_CUSTOM_TOTAL_ATTRS][HID_CUSTOM_NAME_LENGTH];
	struct attribute *attrs[HID_CUSTOM_TOTAL_ATTRS];
	struct attribute_group hid_custom_attribute_group;
};

struct hid_sensor_custom {
	struct mutex mutex;
	struct platform_device *pdev;
	struct hid_sensor_hub_device *hsdev;
	struct hid_sensor_hub_callbacks callbacks;
	int sensor_field_count;
	struct hid_sensor_custom_field *fields;
	int input_field_count;
	int input_report_size;
	int input_report_recd_size;
	bool input_skip_sample;
	bool enable;
	struct hid_sensor_custom_field *power_state;
	struct hid_sensor_custom_field *report_state;
	struct miscdevice custom_dev;
	struct kfifo data_fifo;
	unsigned long misc_opened;
	wait_queue_head_t wait;
};

/* Header for each sample to user space via dev interface */
struct hid_sensor_sample {
	u32 usage_id;
	u64 timestamp;
	u32 raw_len;
} __packed;

static struct attribute hid_custom_attrs[] = {
	{.name = "name", .mode = S_IRUGO},
	{.name = "units", .mode = S_IRUGO},
	{.name = "unit-expo", .mode = S_IRUGO},
	{.name = "minimum", .mode = S_IRUGO},
	{.name = "maximum", .mode = S_IRUGO},
	{.name = "size", .mode = S_IRUGO},
	{.name = "value", .mode = S_IWUSR | S_IRUGO},
	{.name = NULL}
};

static const struct hid_custom_usage_desc {
	int usage_id;
	char *desc;
} hid_custom_usage_desc_table[] = {
	{0x200201,	"event-sensor-state"},
	{0x200202,	"event-sensor-event"},
	{0x200301,	"property-friendly-name"},
	{0x200302,	"property-persistent-unique-id"},
	{0x200303,	"property-sensor-status"},
	{0x200304,	"property-min-report-interval"},
	{0x200305,	"property-sensor-manufacturer"},
	{0x200306,	"property-sensor-model"},
	{0x200307,	"property-sensor-serial-number"},
	{0x200308,	"property-sensor-description"},
	{0x200309,	"property-sensor-connection-type"},
	{0x20030A,	"property-sensor-device-path"},
	{0x20030B,	"property-hardware-revision"},
	{0x20030C,	"property-firmware-version"},
	{0x20030D,	"property-release-date"},
	{0x20030E,	"property-report-interval"},
	{0x20030F,	"property-change-sensitivity-absolute"},
	{0x200310,	"property-change-sensitivity-percent-range"},
	{0x200311,	"property-change-sensitivity-percent-relative"},
	{0x200312,	"property-accuracy"},
	{0x200313,	"property-resolution"},
	{0x200314,	"property-maximum"},
	{0x200315,	"property-minimum"},
	{0x200316,	"property-reporting-state"},
	{0x200317,	"property-sampling-rate"},
	{0x200318,	"property-response-curve"},
	{0x200319,	"property-power-state"},
	{0x200540,	"data-field-custom"},
	{0x200541,	"data-field-custom-usage"},
	{0x200542,	"data-field-custom-boolean-array"},
	{0x200543,	"data-field-custom-value"},
	{0x200544,	"data-field-custom-value_1"},
	{0x200545,	"data-field-custom-value_2"},
	{0x200546,	"data-field-custom-value_3"},
	{0x200547,	"data-field-custom-value_4"},
	{0x200548,	"data-field-custom-value_5"},
	{0x200549,	"data-field-custom-value_6"},
	{0x20054A,	"data-field-custom-value_7"},
	{0x20054B,	"data-field-custom-value_8"},
	{0x20054C,	"data-field-custom-value_9"},
	{0x20054D,	"data-field-custom-value_10"},
	{0x20054E,	"data-field-custom-value_11"},
	{0x20054F,	"data-field-custom-value_12"},
	{0x200550,	"data-field-custom-value_13"},
	{0x200551,	"data-field-custom-value_14"},
	{0x200552,	"data-field-custom-value_15"},
	{0x200553,	"data-field-custom-value_16"},
	{0x200554,	"data-field-custom-value_17"},
	{0x200555,	"data-field-custom-value_18"},
	{0x200556,	"data-field-custom-value_19"},
	{0x200557,	"data-field-custom-value_20"},
	{0x200558,	"data-field-custom-value_21"},
	{0x200559,	"data-field-custom-value_22"},
	{0x20055A,	"data-field-custom-value_23"},
	{0x20055B,	"data-field-custom-value_24"},
	{0x20055C,	"data-field-custom-value_25"},
	{0x20055D,	"data-field-custom-value_26"},
	{0x20055E,	"data-field-custom-value_27"},
	{0x20055F,	"data-field-custom-value_28"},
};

static int usage_id_cmp(const void *p1, const void *p2)
{
	if (*(int *)p1 < *(int *)p2)
		return -1;

	if (*(int *)p1 > *(int *)p2)
		return 1;

	return 0;
}

static ssize_t enable_sensor_show(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct hid_sensor_custom *sensor_inst = platform_get_drvdata(pdev);

	return sprintf(buf, "%d\n", sensor_inst->enable);
}

static int set_power_report_state(struct hid_sensor_custom *sensor_inst,
				  bool state)
{
	int power_val = -1;
	int report_val = -1;
	u32 power_state_usage_id;
	u32 report_state_usage_id;
	int ret;

	/*
	 * It is possible that the power/report state ids are not present.
	 * In this case this function will return success. But if the
	 * ids are present, then it will return error if set fails.
	 */
	if (state) {
		power_state_usage_id =
			HID_USAGE_SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM;
		report_state_usage_id =
			HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM;
	} else {
		power_state_usage_id =
			HID_USAGE_SENSOR_PROP_POWER_STATE_D4_POWER_OFF_ENUM;
		report_state_usage_id =
			HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM;
	}

	if (sensor_inst->power_state)
		power_val = hid_sensor_get_usage_index(sensor_inst->hsdev,
				sensor_inst->power_state->attribute.report_id,
				sensor_inst->power_state->attribute.index,
				power_state_usage_id);
	if (sensor_inst->report_state)
		report_val = hid_sensor_get_usage_index(sensor_inst->hsdev,
				sensor_inst->report_state->attribute.report_id,
				sensor_inst->report_state->attribute.index,
				report_state_usage_id);

	if (power_val >= 0) {
		power_val +=
			sensor_inst->power_state->attribute.logical_minimum;
		ret = sensor_hub_set_feature(sensor_inst->hsdev,
				sensor_inst->power_state->attribute.report_id,
				sensor_inst->power_state->attribute.index,
				sizeof(power_val),
				&power_val);
		if (ret) {
			hid_err(sensor_inst->hsdev->hdev,
				"Set power state failed\n");
			return ret;
		}
	}

	if (report_val >= 0) {
		report_val +=
			sensor_inst->report_state->attribute.logical_minimum;
		ret = sensor_hub_set_feature(sensor_inst->hsdev,
				sensor_inst->report_state->attribute.report_id,
				sensor_inst->report_state->attribute.index,
				sizeof(report_val),
				&report_val);
		if (ret) {
			hid_err(sensor_inst->hsdev->hdev,
				"Set report state failed\n");
			return ret;
		}
	}

	return 0;
}

static ssize_t enable_sensor_store(struct device *dev,
				   struct device_attribute *attr,
				   const char *buf, size_t count)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct hid_sensor_custom *sensor_inst = platform_get_drvdata(pdev);
	int value;
	int ret = -EINVAL;

	if (kstrtoint(buf, 0, &value) != 0)
		return -EINVAL;

	mutex_lock(&sensor_inst->mutex);
	if (value && !sensor_inst->enable) {
		ret = sensor_hub_device_open(sensor_inst->hsdev);
		if (ret)
			goto unlock_state;

		ret = set_power_report_state(sensor_inst, true);
		if (ret) {
			sensor_hub_device_close(sensor_inst->hsdev);
			goto unlock_state;
		}
		sensor_inst->enable = true;
	} else if (!value && sensor_inst->enable) {
		ret = set_power_report_state(sensor_inst, false);
		sensor_hub_device_close(sensor_inst->hsdev);
		sensor_inst->enable = false;
	}
unlock_state:
	mutex_unlock(&sensor_inst->mutex);
	if (ret < 0)
		return ret;

	return count;
}
static DEVICE_ATTR_RW(enable_sensor);

static struct attribute *enable_sensor_attrs[] = {
	&dev_attr_enable_sensor.attr,
	NULL,
};

static const struct attribute_group enable_sensor_attr_group = {
	.attrs = enable_sensor_attrs,
};

static ssize_t show_value(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct hid_sensor_custom *sensor_inst = platform_get_drvdata(pdev);
	struct hid_sensor_hub_attribute_info *attribute;
	int index, usage, field_index;
	char name[HID_CUSTOM_NAME_LENGTH];
	bool feature = false;
	bool input = false;
	int value = 0;

	if (sscanf(attr->attr.name, "feature-%x-%x-%s", &index, &usage,
		   name) == 3) {
		feature = true;
		field_index = index + sensor_inst->input_field_count;
	} else if (sscanf(attr->attr.name, "input-%x-%x-%s", &index, &usage,
		   name) == 3) {
		input = true;
		field_index = index;
	} else
		return -EINVAL;

	if (!strncmp(name, "value", strlen("value"))) {
		u32 report_id;
		int ret;

		attribute = &sensor_inst->fields[field_index].attribute;
		report_id = attribute->report_id;
		if (feature) {
			u8 values[HID_CUSTOM_MAX_FEATURE_BYTES];
			int len = 0;
			u64 value = 0;
			int i = 0;

			ret = sensor_hub_get_feature(sensor_inst->hsdev,
						     report_id,
						     index,
						     sizeof(values), values);
			if (ret < 0)
				return ret;

			while (i < ret) {
				if (i + attribute->size > ret) {
					len += snprintf(&buf[len],
							PAGE_SIZE - len,
							"%d ", values[i]);
					break;
				}
				switch (attribute->size) {
				case 2:
					value = (u64) *(u16 *)&values[i];
					i += attribute->size;
					break;
				case 4:
					value = (u64) *(u32 *)&values[i];
					i += attribute->size;
					break;
				case 8:
					value = *(u64 *)&values[i];
					i += attribute->size;
					break;
				default:
					value = (u64) values[i];
					++i;
					break;
				}
				len += snprintf(&buf[len], PAGE_SIZE - len,
						"%lld ", value);
			}
			len += snprintf(&buf[len], PAGE_SIZE - len, "\n");

			return len;
		} else if (input)
			value = sensor_hub_input_attr_get_raw_value(
						sensor_inst->hsdev,
						sensor_inst->hsdev->usage,
						usage, report_id,
						SENSOR_HUB_SYNC);
	} else if (!strncmp(name, "units", strlen("units")))
		value = sensor_inst->fields[field_index].attribute.units;
	else if (!strncmp(name, "unit-expo", strlen("unit-expo")))
		value = sensor_inst->fields[field_index].attribute.unit_expo;
	else if (!strncmp(name, "size", strlen("size")))
		value = sensor_inst->fields[field_index].attribute.size;
	else if (!strncmp(name, "minimum", strlen("minimum")))
		value = sensor_inst->fields[field_index].attribute.
							logical_minimum;
	else if (!strncmp(name, "maximum", strlen("maximum")))
		value = sensor_inst->fields[field_index].attribute.
							logical_maximum;
	else if (!strncmp(name, "name", strlen("name"))) {
		struct hid_custom_usage_desc *usage_desc;

		usage_desc = bsearch(&usage, hid_custom_usage_desc_table,
				     ARRAY_SIZE(hid_custom_usage_desc_table),
				     sizeof(struct hid_custom_usage_desc),
				     usage_id_cmp);
		if (usage_desc)
			return snprintf(buf, PAGE_SIZE, "%s\n",
					usage_desc->desc);
		else
			return sprintf(buf, "not-specified\n");
	 } else
		return -EINVAL;

	return sprintf(buf, "%d\n", value);
}

static ssize_t store_value(struct device *dev, struct device_attribute *attr,
			   const char *buf, size_t count)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct hid_sensor_custom *sensor_inst = platform_get_drvdata(pdev);
	int index, field_index, usage;
	char name[HID_CUSTOM_NAME_LENGTH];
	int value;

	if (sscanf(attr->attr.name, "feature-%x-%x-%s", &index, &usage,
		   name) == 3) {
		field_index = index + sensor_inst->input_field_count;
	} else
		return -EINVAL;

	if (!strncmp(name, "value", strlen("value"))) {
		u32 report_id;
		int ret;

		if (kstrtoint(buf, 0, &value) != 0)
			return -EINVAL;

		report_id = sensor_inst->fields[field_index].attribute.
								report_id;
		ret = sensor_hub_set_feature(sensor_inst->hsdev, report_id,
					     index, sizeof(value), &value);
	} else
		return -EINVAL;

	return count;
}

static int hid_sensor_capture_sample(struct hid_sensor_hub_device *hsdev,
				  unsigned usage_id, size_t raw_len,
				  char *raw_data, void *priv)
{
	struct hid_sensor_custom *sensor_inst = platform_get_drvdata(priv);
	struct hid_sensor_sample header;

	/* If any error occurs in a sample, rest of the fields are ignored */
	if (sensor_inst->input_skip_sample) {
		hid_err(sensor_inst->hsdev->hdev, "Skipped remaining data\n");
		return 0;
	}

	hid_dbg(sensor_inst->hsdev->hdev, "%s received %d of %d\n", __func__,
		(int) (sensor_inst->input_report_recd_size + raw_len),
		sensor_inst->input_report_size);

	if (!test_bit(0, &sensor_inst->misc_opened))
		return 0;

	if (!sensor_inst->input_report_recd_size) {
		int required_size = sizeof(struct hid_sensor_sample) +
						sensor_inst->input_report_size;
		header.usage_id = hsdev->usage;
		header.raw_len = sensor_inst->input_report_size;
		header.timestamp = ktime_get_real_ns();
		if (kfifo_avail(&sensor_inst->data_fifo) >= required_size) {
			kfifo_in(&sensor_inst->data_fifo,
				 (unsigned char *)&header,
				 sizeof(header));
		} else
			sensor_inst->input_skip_sample = true;
	}
	if (kfifo_avail(&sensor_inst->data_fifo) >= raw_len)
		kfifo_in(&sensor_inst->data_fifo, (unsigned char *)raw_data,
			 raw_len);

	sensor_inst->input_report_recd_size += raw_len;

	return 0;
}

static int hid_sensor_send_event(struct hid_sensor_hub_device *hsdev,
				 unsigned usage_id, void *priv)
{
	struct hid_sensor_custom *sensor_inst = platform_get_drvdata(priv);

	if (!test_bit(0, &sensor_inst->misc_opened))
		return 0;

	sensor_inst->input_report_recd_size = 0;
	sensor_inst->input_skip_sample = false;

	wake_up(&sensor_inst->wait);

	return 0;
}

static int hid_sensor_custom_add_field(struct hid_sensor_custom *sensor_inst,
				       int index, int report_type,
				       struct hid_report *report,
				       struct hid_field *field)
{
	struct hid_sensor_custom_field *sensor_field;
	void *fields;

	fields = krealloc(sensor_inst->fields,
			  (sensor_inst->sensor_field_count + 1) *
			   sizeof(struct hid_sensor_custom_field), GFP_KERNEL);
	if (!fields) {
		kfree(sensor_inst->fields);
		return -ENOMEM;
	}
	sensor_inst->fields = fields;
	sensor_field = &sensor_inst->fields[sensor_inst->sensor_field_count];
	sensor_field->attribute.usage_id = sensor_inst->hsdev->usage;
	if (field->logical)
		sensor_field->attribute.attrib_id = field->logical;
	else
		sensor_field->attribute.attrib_id = field->usage[0].hid;

	sensor_field->attribute.index = index;
	sensor_field->attribute.report_id = report->id;
	sensor_field->attribute.units = field->unit;
	sensor_field->attribute.unit_expo = field->unit_exponent;
	sensor_field->attribute.size = (field->report_size / 8);
	sensor_field->attribute.logical_minimum = field->logical_minimum;
	sensor_field->attribute.logical_maximum = field->logical_maximum;

	if (report_type == HID_FEATURE_REPORT)
		snprintf(sensor_field->group_name,
			 sizeof(sensor_field->group_name), "feature-%x-%x",
			 sensor_field->attribute.index,
			 sensor_field->attribute.attrib_id);
	else if (report_type == HID_INPUT_REPORT) {
		snprintf(sensor_field->group_name,
			 sizeof(sensor_field->group_name),
			 "input-%x-%x", sensor_field->attribute.index,
			 sensor_field->attribute.attrib_id);
		sensor_inst->input_field_count++;
		sensor_inst->input_report_size += (field->report_size *
						   field->report_count) / 8;
	}

	memset(&sensor_field->hid_custom_attribute_group, 0,
	       sizeof(struct attribute_group));
	sensor_inst->sensor_field_count++;

	return 0;
}

static int hid_sensor_custom_add_fields(struct hid_sensor_custom *sensor_inst,
					struct hid_report_enum *report_enum,
					int report_type)
{
	int i;
	int ret;
	struct hid_report *report;
	struct hid_field *field;
	struct hid_sensor_hub_device *hsdev = sensor_inst->hsdev;

	list_for_each_entry(report, &report_enum->report_list, list) {
		for (i = 0; i < report->maxfield; ++i) {
			field = report->field[i];
			if (field->maxusage &&
			    ((field->usage[0].collection_index >=
			      hsdev->start_collection_index) &&
			      (field->usage[0].collection_index <
			       hsdev->end_collection_index))) {

				ret = hid_sensor_custom_add_field(sensor_inst,
								  i,
								  report_type,
								  report,
								  field);
				if (ret)
					return ret;

			}
		}
	}

	return 0;
}

static int hid_sensor_custom_add_attributes(struct hid_sensor_custom
								*sensor_inst)
{
	struct hid_sensor_hub_device *hsdev = sensor_inst->hsdev;
	struct hid_device *hdev = hsdev->hdev;
	int ret = -1;
	int i, j;

	for (j = 0; j < HID_REPORT_TYPES; ++j) {
		if (j == HID_OUTPUT_REPORT)
			continue;

		ret = hid_sensor_custom_add_fields(sensor_inst,
						   &hdev->report_enum[j], j);
		if (ret)
			return ret;

	}

	/* Create sysfs attributes */
	for (i = 0; i < sensor_inst->sensor_field_count; ++i) {
		j = 0;
		while (j < HID_CUSTOM_TOTAL_ATTRS &&
		       hid_custom_attrs[j].name) {
			struct device_attribute *device_attr;

			device_attr = &sensor_inst->fields[i].sd_attrs[j];

			snprintf((char *)&sensor_inst->fields[i].attr_name[j],
				 HID_CUSTOM_NAME_LENGTH, "%s-%s",
				 sensor_inst->fields[i].group_name,
				 hid_custom_attrs[j].name);
			sysfs_attr_init(&device_attr->attr);
			device_attr->attr.name =
				(char *)&sensor_inst->fields[i].attr_name[j];
			device_attr->attr.mode = hid_custom_attrs[j].mode;
			device_attr->show = show_value;
			if (hid_custom_attrs[j].mode & S_IWUSR)
				device_attr->store = store_value;
			sensor_inst->fields[i].attrs[j] = &device_attr->attr;
			++j;
		}
		sensor_inst->fields[i].attrs[j] = NULL;
		sensor_inst->fields[i].hid_custom_attribute_group.attrs =
						sensor_inst->fields[i].attrs;
		sensor_inst->fields[i].hid_custom_attribute_group.name =
					sensor_inst->fields[i].group_name;
		ret = sysfs_create_group(&sensor_inst->pdev->dev.kobj,
					 &sensor_inst->fields[i].
					 hid_custom_attribute_group);
		if (ret)
			break;

		/* For power or report field store indexes */
		if (sensor_inst->fields[i].attribute.attrib_id ==
					HID_USAGE_SENSOR_PROY_POWER_STATE)
			sensor_inst->power_state = &sensor_inst->fields[i];
		else if (sensor_inst->fields[i].attribute.attrib_id ==
					HID_USAGE_SENSOR_PROP_REPORT_STATE)
			sensor_inst->report_state = &sensor_inst->fields[i];
	}

	return ret;
}

static void hid_sensor_custom_remove_attributes(struct hid_sensor_custom *
								sensor_inst)
{
	int i;

	for (i = 0; i < sensor_inst->sensor_field_count; ++i)
		sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
				   &sensor_inst->fields[i].
				   hid_custom_attribute_group);

	kfree(sensor_inst->fields);
}

static ssize_t hid_sensor_custom_read(struct file *file, char __user *buf,
				      size_t count, loff_t *f_ps)
{
	struct hid_sensor_custom *sensor_inst;
	unsigned int copied;
	int ret;

	sensor_inst = container_of(file->private_data,
				   struct hid_sensor_custom, custom_dev);

	if (count < sizeof(struct hid_sensor_sample))
		return -EINVAL;

	do {
		if (kfifo_is_empty(&sensor_inst->data_fifo)) {
			if (file->f_flags & O_NONBLOCK)
				return -EAGAIN;

			ret = wait_event_interruptible(sensor_inst->wait,
				!kfifo_is_empty(&sensor_inst->data_fifo));
			if (ret)
				return ret;
		}
		ret = kfifo_to_user(&sensor_inst->data_fifo, buf, count,
				    &copied);
		if (ret)
			return ret;

	} while (copied == 0);

	return copied;
}

static int hid_sensor_custom_release(struct inode *inode, struct file *file)
{
	struct hid_sensor_custom *sensor_inst;

	sensor_inst = container_of(file->private_data,
				   struct hid_sensor_custom, custom_dev);

	clear_bit(0, &sensor_inst->misc_opened);

	return 0;
}

static int hid_sensor_custom_open(struct inode *inode, struct file *file)
{
	struct hid_sensor_custom *sensor_inst;

	sensor_inst = container_of(file->private_data,
				   struct hid_sensor_custom, custom_dev);
	/* We essentially have single reader and writer */
	if (test_and_set_bit(0, &sensor_inst->misc_opened))
		return -EBUSY;

	return nonseekable_open(inode, file);
}

static __poll_t hid_sensor_custom_poll(struct file *file,
					   struct poll_table_struct *wait)
{
	struct hid_sensor_custom *sensor_inst;
	__poll_t mask = 0;

	sensor_inst = container_of(file->private_data,
				   struct hid_sensor_custom, custom_dev);

	poll_wait(file, &sensor_inst->wait, wait);

	if (!kfifo_is_empty(&sensor_inst->data_fifo))
		mask = EPOLLIN | EPOLLRDNORM;

	return mask;
}

static const struct file_operations hid_sensor_custom_fops = {
	.open =  hid_sensor_custom_open,
	.read =  hid_sensor_custom_read,
	.release = hid_sensor_custom_release,
	.poll = hid_sensor_custom_poll,
	.llseek = noop_llseek,
};

static int hid_sensor_custom_dev_if_add(struct hid_sensor_custom *sensor_inst)
{
	int ret;

	ret = kfifo_alloc(&sensor_inst->data_fifo, HID_CUSTOM_FIFO_SIZE,
			  GFP_KERNEL);
	if (ret)
		return ret;

	init_waitqueue_head(&sensor_inst->wait);

	sensor_inst->custom_dev.minor = MISC_DYNAMIC_MINOR;
	sensor_inst->custom_dev.name = dev_name(&sensor_inst->pdev->dev);
	sensor_inst->custom_dev.fops = &hid_sensor_custom_fops,
	ret = misc_register(&sensor_inst->custom_dev);
	if (ret) {
		kfifo_free(&sensor_inst->data_fifo);
		return ret;
	}
	return 0;
}

static void hid_sensor_custom_dev_if_remove(struct hid_sensor_custom
								*sensor_inst)
{
	wake_up(&sensor_inst->wait);
	misc_deregister(&sensor_inst->custom_dev);
	kfifo_free(&sensor_inst->data_fifo);

}

static int hid_sensor_custom_probe(struct platform_device *pdev)
{
	struct hid_sensor_custom *sensor_inst;
	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
	int ret;

	sensor_inst = devm_kzalloc(&pdev->dev, sizeof(*sensor_inst),
				   GFP_KERNEL);
	if (!sensor_inst)
		return -ENOMEM;

	sensor_inst->callbacks.capture_sample = hid_sensor_capture_sample;
	sensor_inst->callbacks.send_event = hid_sensor_send_event;
	sensor_inst->callbacks.pdev = pdev;
	sensor_inst->hsdev = hsdev;
	sensor_inst->pdev = pdev;
	mutex_init(&sensor_inst->mutex);
	platform_set_drvdata(pdev, sensor_inst);
	ret = sensor_hub_register_callback(hsdev, hsdev->usage,
					   &sensor_inst->callbacks);
	if (ret < 0) {
		dev_err(&pdev->dev, "callback reg failed\n");
		return ret;
	}

	ret = sysfs_create_group(&sensor_inst->pdev->dev.kobj,
				 &enable_sensor_attr_group);
	if (ret)
		goto err_remove_callback;

	ret = hid_sensor_custom_add_attributes(sensor_inst);
	if (ret)
		goto err_remove_group;

	ret = hid_sensor_custom_dev_if_add(sensor_inst);
	if (ret)
		goto err_remove_attributes;

	return 0;

err_remove_attributes:
	hid_sensor_custom_remove_attributes(sensor_inst);
err_remove_group:
	sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
			   &enable_sensor_attr_group);
err_remove_callback:
	sensor_hub_remove_callback(hsdev, hsdev->usage);

	return ret;
}

static int hid_sensor_custom_remove(struct platform_device *pdev)
{
	struct hid_sensor_custom *sensor_inst = platform_get_drvdata(pdev);
	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;

	hid_sensor_custom_dev_if_remove(sensor_inst);
	hid_sensor_custom_remove_attributes(sensor_inst);
	sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
			   &enable_sensor_attr_group);
	sensor_hub_remove_callback(hsdev, hsdev->usage);

	return 0;
}

static const struct platform_device_id hid_sensor_custom_ids[] = {
	{
		.name = "HID-SENSOR-2000e1",
	},
	{
		.name = "HID-SENSOR-2000e2",
	},
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, hid_sensor_custom_ids);

static struct platform_driver hid_sensor_custom_platform_driver = {
	.id_table = hid_sensor_custom_ids,
	.driver = {
		.name	= KBUILD_MODNAME,
	},
	.probe		= hid_sensor_custom_probe,
	.remove		= hid_sensor_custom_remove,
};
module_platform_driver(hid_sensor_custom_platform_driver);

MODULE_DESCRIPTION("HID Sensor Custom and Generic sensor Driver");
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
MODULE_LICENSE("GPL");