aboutsummaryrefslogtreecommitdiff
path: root/drivers/iio/light/us5182d.c
blob: 393f27b75c75ec1d82dd2232ed2763a69e26c37f (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
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2015 Intel Corporation
 *
 * Driver for UPISEMI us5182d Proximity and Ambient Light Sensor.
 *
 * To do: Interrupt support.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/iio/events.h>
#include <linux/iio/iio.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/iio/sysfs.h>
#include <linux/mutex.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>

#define US5182D_REG_CFG0				0x00
#define US5182D_CFG0_ONESHOT_EN				BIT(6)
#define US5182D_CFG0_SHUTDOWN_EN			BIT(7)
#define US5182D_CFG0_WORD_ENABLE			BIT(0)
#define US5182D_CFG0_PROX				BIT(3)
#define US5182D_CFG0_PX_IRQ				BIT(2)

#define US5182D_REG_CFG1				0x01
#define US5182D_CFG1_ALS_RES16				BIT(4)
#define US5182D_CFG1_AGAIN_DEFAULT			0x00

#define US5182D_REG_CFG2				0x02
#define US5182D_CFG2_PX_RES16				BIT(4)
#define US5182D_CFG2_PXGAIN_DEFAULT			BIT(2)

#define US5182D_REG_CFG3				0x03
#define US5182D_CFG3_LED_CURRENT100			(BIT(4) | BIT(5))
#define US5182D_CFG3_INT_SOURCE_PX			BIT(3)

#define US5182D_REG_CFG4				0x10

/*
 * Registers for tuning the auto dark current cancelling feature.
 * DARK_TH(reg 0x27,0x28) - threshold (counts) for auto dark cancelling.
 * when ALS  > DARK_TH --> ALS_Code = ALS - Upper(0x2A) * Dark
 * when ALS < DARK_TH --> ALS_Code = ALS - Lower(0x29) * Dark
 */
#define US5182D_REG_UDARK_TH			0x27
#define US5182D_REG_DARK_AUTO_EN		0x2b
#define US5182D_REG_AUTO_LDARK_GAIN		0x29
#define US5182D_REG_AUTO_HDARK_GAIN		0x2a

/* Thresholds for events: px low (0x08-l, 0x09-h), px high (0x0a-l 0x0b-h) */
#define US5182D_REG_PXL_TH			0x08
#define US5182D_REG_PXH_TH			0x0a

#define US5182D_REG_PXL_TH_DEFAULT		1000
#define US5182D_REG_PXH_TH_DEFAULT		30000

#define US5182D_OPMODE_ALS			0x01
#define US5182D_OPMODE_PX			0x02
#define US5182D_OPMODE_SHIFT			4

#define US5182D_REG_DARK_AUTO_EN_DEFAULT	0x80
#define US5182D_REG_AUTO_LDARK_GAIN_DEFAULT	0x16
#define US5182D_REG_AUTO_HDARK_GAIN_DEFAULT	0x00

#define US5182D_REG_ADL				0x0c
#define US5182D_REG_PDL				0x0e

#define US5182D_REG_MODE_STORE			0x21
#define US5182D_STORE_MODE			0x01

#define US5182D_REG_CHIPID			0xb2

#define US5182D_OPMODE_MASK			GENMASK(5, 4)
#define US5182D_AGAIN_MASK			0x07
#define US5182D_RESET_CHIP			0x01

#define US5182D_CHIPID				0x26
#define US5182D_DRV_NAME			"us5182d"

#define US5182D_GA_RESOLUTION			1000

#define US5182D_READ_BYTE			1
#define US5182D_READ_WORD			2
#define US5182D_OPSTORE_SLEEP_TIME		20 /* ms */
#define US5182D_SLEEP_MS			3000 /* ms */
#define US5182D_PXH_TH_DISABLE			0xffff
#define US5182D_PXL_TH_DISABLE			0x0000

/* Available ranges: [12354, 7065, 3998, 2202, 1285, 498, 256, 138] lux */
static const int us5182d_scales[] = {188500, 107800, 61000, 33600, 19600, 7600,
				     3900, 2100};

/*
 * Experimental thresholds that work with US5182D sensor on evaluation board
 * roughly between 12-32 lux
 */
static u16 us5182d_dark_ths_vals[] = {170, 200, 512, 512, 800, 2000, 4000,
				      8000};

enum mode {
	US5182D_ALS_PX,
	US5182D_ALS_ONLY,
	US5182D_PX_ONLY
};

enum pmode {
	US5182D_CONTINUOUS,
	US5182D_ONESHOT
};

struct us5182d_data {
	struct i2c_client *client;
	struct mutex lock;

	/* Glass attenuation factor */
	u32 ga;

	/* Dark gain tuning */
	u8 lower_dark_gain;
	u8 upper_dark_gain;
	u16 *us5182d_dark_ths;

	u16 px_low_th;
	u16 px_high_th;

	int rising_en;
	int falling_en;

	u8 opmode;
	u8 power_mode;

	bool als_enabled;
	bool px_enabled;

	bool default_continuous;
};

static IIO_CONST_ATTR(in_illuminance_scale_available,
		      "0.0021 0.0039 0.0076 0.0196 0.0336 0.061 0.1078 0.1885");

static struct attribute *us5182d_attrs[] = {
	&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
	NULL
};

static const struct attribute_group us5182d_attr_group = {
	.attrs = us5182d_attrs,
};

static const struct {
	u8 reg;
	u8 val;
} us5182d_regvals[] = {
	{US5182D_REG_CFG0, US5182D_CFG0_WORD_ENABLE},
	{US5182D_REG_CFG1, US5182D_CFG1_ALS_RES16},
	{US5182D_REG_CFG2, (US5182D_CFG2_PX_RES16 |
			    US5182D_CFG2_PXGAIN_DEFAULT)},
	{US5182D_REG_CFG3, US5182D_CFG3_LED_CURRENT100 |
			   US5182D_CFG3_INT_SOURCE_PX},
	{US5182D_REG_CFG4, 0x00},
};

static const struct iio_event_spec us5182d_events[] = {
	{
		.type = IIO_EV_TYPE_THRESH,
		.dir = IIO_EV_DIR_RISING,
		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
				BIT(IIO_EV_INFO_ENABLE),
	},
	{
		.type = IIO_EV_TYPE_THRESH,
		.dir = IIO_EV_DIR_FALLING,
		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
				BIT(IIO_EV_INFO_ENABLE),
	},
};

static const struct iio_chan_spec us5182d_channels[] = {
	{
		.type = IIO_LIGHT,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
				      BIT(IIO_CHAN_INFO_SCALE),
	},
	{
		.type = IIO_PROXIMITY,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.event_spec = us5182d_events,
		.num_event_specs = ARRAY_SIZE(us5182d_events),
	}
};

static int us5182d_oneshot_en(struct us5182d_data *data)
{
	int ret;

	ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0);
	if (ret < 0)
		return ret;

	/*
	 * In oneshot mode the chip will power itself down after taking the
	 * required measurement.
	 */
	ret = ret | US5182D_CFG0_ONESHOT_EN;

	return i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret);
}

static int us5182d_set_opmode(struct us5182d_data *data, u8 mode)
{
	int ret;

	if (mode == data->opmode)
		return 0;

	ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0);
	if (ret < 0)
		return ret;

	/* update mode */
	ret = ret & ~US5182D_OPMODE_MASK;
	ret = ret | (mode << US5182D_OPMODE_SHIFT);

	/*
	 * After updating the operating mode, the chip requires that
	 * the operation is stored, by writing 1 in the STORE_MODE
	 * register (auto-clearing).
	 */
	ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_MODE_STORE,
					US5182D_STORE_MODE);
	if (ret < 0)
		return ret;

	data->opmode = mode;
	msleep(US5182D_OPSTORE_SLEEP_TIME);

	return 0;
}

static int us5182d_als_enable(struct us5182d_data *data)
{
	int ret;
	u8 mode;

	if (data->power_mode == US5182D_ONESHOT) {
		ret = us5182d_set_opmode(data, US5182D_ALS_ONLY);
		if (ret < 0)
			return ret;
		data->px_enabled = false;
	}

	if (data->als_enabled)
		return 0;

	mode = data->px_enabled ? US5182D_ALS_PX : US5182D_ALS_ONLY;

	ret = us5182d_set_opmode(data, mode);
	if (ret < 0)
		return ret;

	data->als_enabled = true;

	return 0;
}

static int us5182d_px_enable(struct us5182d_data *data)
{
	int ret;
	u8 mode;

	if (data->power_mode == US5182D_ONESHOT) {
		ret = us5182d_set_opmode(data, US5182D_PX_ONLY);
		if (ret < 0)
			return ret;
		data->als_enabled = false;
	}

	if (data->px_enabled)
		return 0;

	mode = data->als_enabled ? US5182D_ALS_PX : US5182D_PX_ONLY;

	ret = us5182d_set_opmode(data, mode);
	if (ret < 0)
		return ret;

	data->px_enabled = true;

	return 0;
}

static int us5182d_get_als(struct us5182d_data *data)
{
	int ret;
	unsigned long result;

	ret = us5182d_als_enable(data);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_read_word_data(data->client,
				       US5182D_REG_ADL);
	if (ret < 0)
		return ret;

	result = ret * data->ga / US5182D_GA_RESOLUTION;
	if (result > 0xffff)
		result = 0xffff;

	return result;
}

static int us5182d_get_px(struct us5182d_data *data)
{
	int ret;

	ret = us5182d_px_enable(data);
	if (ret < 0)
		return ret;

	return i2c_smbus_read_word_data(data->client,
					US5182D_REG_PDL);
}

static int us5182d_shutdown_en(struct us5182d_data *data, u8 state)
{
	int ret;

	if (data->power_mode == US5182D_ONESHOT)
		return 0;

	ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0);
	if (ret < 0)
		return ret;

	ret = ret & ~US5182D_CFG0_SHUTDOWN_EN;
	ret = ret | state;

	ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret);
	if (ret < 0)
		return ret;

	if (state & US5182D_CFG0_SHUTDOWN_EN) {
		data->als_enabled = false;
		data->px_enabled = false;
	}

	return ret;
}


static int us5182d_set_power_state(struct us5182d_data *data, bool on)
{
	int ret;

	if (data->power_mode == US5182D_ONESHOT)
		return 0;

	if (on) {
		ret = pm_runtime_get_sync(&data->client->dev);
		if (ret < 0)
			pm_runtime_put_noidle(&data->client->dev);
	} else {
		pm_runtime_mark_last_busy(&data->client->dev);
		ret = pm_runtime_put_autosuspend(&data->client->dev);
	}

	return ret;
}

static int us5182d_read_value(struct us5182d_data *data,
			      struct iio_chan_spec const *chan)
{
	int ret, value;

	mutex_lock(&data->lock);

	if (data->power_mode == US5182D_ONESHOT) {
		ret = us5182d_oneshot_en(data);
		if (ret < 0)
			goto out_err;
	}

	ret = us5182d_set_power_state(data, true);
	if (ret < 0)
		goto out_err;

	if (chan->type == IIO_LIGHT)
		ret = us5182d_get_als(data);
	else
		ret = us5182d_get_px(data);
	if (ret < 0)
		goto out_poweroff;

	value = ret;

	ret = us5182d_set_power_state(data, false);
	if (ret < 0)
		goto out_err;

	mutex_unlock(&data->lock);
	return value;

out_poweroff:
	us5182d_set_power_state(data, false);
out_err:
	mutex_unlock(&data->lock);
	return ret;
}

static int us5182d_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan, int *val,
			    int *val2, long mask)
{
	struct us5182d_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		ret = us5182d_read_value(data, chan);
		if (ret < 0)
			return ret;
		*val = ret;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG1);
		if (ret < 0)
			return ret;
		*val = 0;
		*val2 = us5182d_scales[ret & US5182D_AGAIN_MASK];
		return IIO_VAL_INT_PLUS_MICRO;
	default:
		return -EINVAL;
	}
}

/**
 * us5182d_update_dark_th - update Darh_Th registers
 * @data:	us5182d_data structure
 * @index:	index in us5182d_dark_ths array to use for the updated value
 *
 * Function needs to be called with a lock held because it needs two i2c write
 * byte operations as these registers (0x27 0x28) don't work in word mode
 * accessing.
 */
static int us5182d_update_dark_th(struct us5182d_data *data, int index)
{
	__be16 dark_th = cpu_to_be16(data->us5182d_dark_ths[index]);
	int ret;

	ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_UDARK_TH,
					((u8 *)&dark_th)[0]);
	if (ret < 0)
		return ret;

	return i2c_smbus_write_byte_data(data->client, US5182D_REG_UDARK_TH + 1,
					((u8 *)&dark_th)[1]);
}

/**
 * us5182d_apply_scale - update the ALS scale
 * @data:	us5182d_data structure
 * @index:	index in us5182d_scales array to use for the updated value
 *
 * Function needs to be called with a lock held as we're having more than one
 * i2c operation.
 */
static int us5182d_apply_scale(struct us5182d_data *data, int index)
{
	int ret;

	ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG1);
	if (ret < 0)
		return ret;

	ret = ret & (~US5182D_AGAIN_MASK);
	ret |= index;

	ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG1, ret);
	if (ret < 0)
		return ret;

	return us5182d_update_dark_th(data, index);
}

static int us5182d_write_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan, int val,
			     int val2, long mask)
{
	struct us5182d_data *data = iio_priv(indio_dev);
	int ret, i;

	switch (mask) {
	case IIO_CHAN_INFO_SCALE:
		if (val != 0)
			return -EINVAL;
		for (i = 0; i < ARRAY_SIZE(us5182d_scales); i++)
			if (val2 == us5182d_scales[i]) {
				mutex_lock(&data->lock);
				ret = us5182d_apply_scale(data, i);
				mutex_unlock(&data->lock);
				return ret;
			}
		break;
	default:
		return -EINVAL;
	}

	return -EINVAL;
}

static int us5182d_setup_prox(struct iio_dev *indio_dev,
			      enum iio_event_direction dir, u16 val)
{
	struct us5182d_data *data = iio_priv(indio_dev);

	if (dir == IIO_EV_DIR_FALLING)
		return i2c_smbus_write_word_data(data->client,
						 US5182D_REG_PXL_TH, val);
	else if (dir == IIO_EV_DIR_RISING)
		return i2c_smbus_write_word_data(data->client,
						 US5182D_REG_PXH_TH, val);

	return 0;
}

static int us5182d_read_thresh(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan, enum iio_event_type type,
	enum iio_event_direction dir, enum iio_event_info info, int *val,
	int *val2)
{
	struct us5182d_data *data = iio_priv(indio_dev);

	switch (dir) {
	case IIO_EV_DIR_RISING:
		mutex_lock(&data->lock);
		*val = data->px_high_th;
		mutex_unlock(&data->lock);
		break;
	case IIO_EV_DIR_FALLING:
		mutex_lock(&data->lock);
		*val = data->px_low_th;
		mutex_unlock(&data->lock);
		break;
	default:
		return -EINVAL;
	}

	return IIO_VAL_INT;
}

static int us5182d_write_thresh(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan, enum iio_event_type type,
	enum iio_event_direction dir, enum iio_event_info info, int val,
	int val2)
{
	struct us5182d_data *data = iio_priv(indio_dev);
	int ret;

	if (val < 0 || val > USHRT_MAX || val2 != 0)
		return -EINVAL;

	switch (dir) {
	case IIO_EV_DIR_RISING:
		mutex_lock(&data->lock);
		if (data->rising_en) {
			ret = us5182d_setup_prox(indio_dev, dir, val);
			if (ret < 0)
				goto err;
		}
		data->px_high_th = val;
		mutex_unlock(&data->lock);
		break;
	case IIO_EV_DIR_FALLING:
		mutex_lock(&data->lock);
		if (data->falling_en) {
			ret = us5182d_setup_prox(indio_dev, dir, val);
			if (ret < 0)
				goto err;
		}
		data->px_low_th = val;
		mutex_unlock(&data->lock);
		break;
	default:
		return -EINVAL;
	}

	return 0;
err:
	mutex_unlock(&data->lock);
	return ret;
}

static int us5182d_read_event_config(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan, enum iio_event_type type,
	enum iio_event_direction dir)
{
	struct us5182d_data *data = iio_priv(indio_dev);
	int ret;

	switch (dir) {
	case IIO_EV_DIR_RISING:
		mutex_lock(&data->lock);
		ret = data->rising_en;
		mutex_unlock(&data->lock);
		break;
	case IIO_EV_DIR_FALLING:
		mutex_lock(&data->lock);
		ret = data->falling_en;
		mutex_unlock(&data->lock);
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static int us5182d_write_event_config(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan, enum iio_event_type type,
	enum iio_event_direction dir, int state)
{
	struct us5182d_data *data = iio_priv(indio_dev);
	int ret;
	u16 new_th;

	mutex_lock(&data->lock);

	switch (dir) {
	case IIO_EV_DIR_RISING:
		if (data->rising_en == state) {
			mutex_unlock(&data->lock);
			return 0;
		}
		new_th = US5182D_PXH_TH_DISABLE;
		if (state) {
			data->power_mode = US5182D_CONTINUOUS;
			ret = us5182d_set_power_state(data, true);
			if (ret < 0)
				goto err;
			ret = us5182d_px_enable(data);
			if (ret < 0)
				goto err_poweroff;
			new_th = data->px_high_th;
		}
		ret = us5182d_setup_prox(indio_dev, dir, new_th);
		if (ret < 0)
			goto err_poweroff;
		data->rising_en = state;
		break;
	case IIO_EV_DIR_FALLING:
		if (data->falling_en == state) {
			mutex_unlock(&data->lock);
			return 0;
		}
		new_th =  US5182D_PXL_TH_DISABLE;
		if (state) {
			data->power_mode = US5182D_CONTINUOUS;
			ret = us5182d_set_power_state(data, true);
			if (ret < 0)
				goto err;
			ret = us5182d_px_enable(data);
			if (ret < 0)
				goto err_poweroff;
			new_th = data->px_low_th;
		}
		ret = us5182d_setup_prox(indio_dev, dir, new_th);
		if (ret < 0)
			goto err_poweroff;
		data->falling_en = state;
		break;
	default:
		ret = -EINVAL;
		goto err;
	}

	if (!state) {
		ret = us5182d_set_power_state(data, false);
		if (ret < 0)
			goto err;
	}

	if (!data->falling_en && !data->rising_en && !data->default_continuous)
		data->power_mode = US5182D_ONESHOT;

	mutex_unlock(&data->lock);
	return 0;

err_poweroff:
	if (state)
		us5182d_set_power_state(data, false);
err:
	mutex_unlock(&data->lock);
	return ret;
}

static const struct iio_info us5182d_info = {
	.read_raw = us5182d_read_raw,
	.write_raw = us5182d_write_raw,
	.attrs = &us5182d_attr_group,
	.read_event_value = &us5182d_read_thresh,
	.write_event_value = &us5182d_write_thresh,
	.read_event_config = &us5182d_read_event_config,
	.write_event_config = &us5182d_write_event_config,
};

static int us5182d_reset(struct iio_dev *indio_dev)
{
	struct us5182d_data *data = iio_priv(indio_dev);

	return i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG3,
					 US5182D_RESET_CHIP);
}

static int us5182d_init(struct iio_dev *indio_dev)
{
	struct us5182d_data *data = iio_priv(indio_dev);
	int i, ret;

	ret = us5182d_reset(indio_dev);
	if (ret < 0)
		return ret;

	data->opmode = 0;
	data->power_mode = US5182D_CONTINUOUS;
	data->px_low_th = US5182D_REG_PXL_TH_DEFAULT;
	data->px_high_th = US5182D_REG_PXH_TH_DEFAULT;

	for (i = 0; i < ARRAY_SIZE(us5182d_regvals); i++) {
		ret = i2c_smbus_write_byte_data(data->client,
						us5182d_regvals[i].reg,
						us5182d_regvals[i].val);
		if (ret < 0)
			return ret;
	}

	data->als_enabled = true;
	data->px_enabled = true;

	if (!data->default_continuous) {
		ret = us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN);
		if (ret < 0)
			return ret;
		data->power_mode = US5182D_ONESHOT;
	}

	return ret;
}

static void us5182d_get_platform_data(struct iio_dev *indio_dev)
{
	struct us5182d_data *data = iio_priv(indio_dev);

	if (device_property_read_u32(&data->client->dev, "upisemi,glass-coef",
				     &data->ga))
		data->ga = US5182D_GA_RESOLUTION;
	if (device_property_read_u16_array(&data->client->dev,
					   "upisemi,dark-ths",
					   data->us5182d_dark_ths,
					   ARRAY_SIZE(us5182d_dark_ths_vals)))
		data->us5182d_dark_ths = us5182d_dark_ths_vals;
	if (device_property_read_u8(&data->client->dev,
				    "upisemi,upper-dark-gain",
				    &data->upper_dark_gain))
		data->upper_dark_gain = US5182D_REG_AUTO_HDARK_GAIN_DEFAULT;
	if (device_property_read_u8(&data->client->dev,
				    "upisemi,lower-dark-gain",
				    &data->lower_dark_gain))
		data->lower_dark_gain = US5182D_REG_AUTO_LDARK_GAIN_DEFAULT;
	data->default_continuous = device_property_read_bool(&data->client->dev,
							     "upisemi,continuous");
}

static int  us5182d_dark_gain_config(struct iio_dev *indio_dev)
{
	struct us5182d_data *data = iio_priv(indio_dev);
	int ret;

	ret = us5182d_update_dark_th(data, US5182D_CFG1_AGAIN_DEFAULT);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_write_byte_data(data->client,
					US5182D_REG_AUTO_LDARK_GAIN,
					data->lower_dark_gain);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_write_byte_data(data->client,
					US5182D_REG_AUTO_HDARK_GAIN,
					data->upper_dark_gain);
	if (ret < 0)
		return ret;

	return i2c_smbus_write_byte_data(data->client, US5182D_REG_DARK_AUTO_EN,
					 US5182D_REG_DARK_AUTO_EN_DEFAULT);
}

static irqreturn_t us5182d_irq_thread_handler(int irq, void *private)
{
	struct iio_dev *indio_dev = private;
	struct us5182d_data *data = iio_priv(indio_dev);
	enum iio_event_direction dir;
	int ret;
	u64 ev;

	ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0);
	if (ret < 0) {
		dev_err(&data->client->dev, "i2c transfer error in irq\n");
		return IRQ_HANDLED;
	}

	dir = ret & US5182D_CFG0_PROX ? IIO_EV_DIR_RISING : IIO_EV_DIR_FALLING;
	ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1, IIO_EV_TYPE_THRESH, dir);

	iio_push_event(indio_dev, ev, iio_get_time_ns(indio_dev));

	ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0,
					ret & ~US5182D_CFG0_PX_IRQ);
	if (ret < 0)
		dev_err(&data->client->dev, "i2c transfer error in irq\n");

	return IRQ_HANDLED;
}

static int us5182d_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct us5182d_data *data;
	struct iio_dev *indio_dev;
	int ret;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	if (!indio_dev)
		return -ENOMEM;

	data = iio_priv(indio_dev);
	i2c_set_clientdata(client, indio_dev);
	data->client = client;

	mutex_init(&data->lock);

	indio_dev->info = &us5182d_info;
	indio_dev->name = US5182D_DRV_NAME;
	indio_dev->channels = us5182d_channels;
	indio_dev->num_channels = ARRAY_SIZE(us5182d_channels);
	indio_dev->modes = INDIO_DIRECT_MODE;

	ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CHIPID);
	if (ret != US5182D_CHIPID) {
		dev_err(&data->client->dev,
			"Failed to detect US5182 light chip\n");
		return (ret < 0) ? ret : -ENODEV;
	}

	if (client->irq > 0) {
		ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
						us5182d_irq_thread_handler,
						IRQF_TRIGGER_LOW | IRQF_ONESHOT,
						"us5182d-irq", indio_dev);
		if (ret < 0)
			return ret;
	} else
		dev_warn(&client->dev, "no valid irq found\n");

	us5182d_get_platform_data(indio_dev);
	ret = us5182d_init(indio_dev);
	if (ret < 0)
		return ret;

	ret = us5182d_dark_gain_config(indio_dev);
	if (ret < 0)
		goto out_err;

	if (data->default_continuous) {
		ret = pm_runtime_set_active(&client->dev);
		if (ret < 0)
			goto out_err;
	}

	pm_runtime_enable(&client->dev);
	pm_runtime_set_autosuspend_delay(&client->dev,
					 US5182D_SLEEP_MS);
	pm_runtime_use_autosuspend(&client->dev);

	ret = iio_device_register(indio_dev);
	if (ret < 0)
		goto out_err;

	return 0;

out_err:
	us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN);
	return ret;

}

static int us5182d_remove(struct i2c_client *client)
{
	struct us5182d_data *data = iio_priv(i2c_get_clientdata(client));

	iio_device_unregister(i2c_get_clientdata(client));

	pm_runtime_disable(&client->dev);
	pm_runtime_set_suspended(&client->dev);

	return us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN);
}

#if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM)
static int us5182d_suspend(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	struct us5182d_data *data = iio_priv(indio_dev);

	if (data->power_mode == US5182D_CONTINUOUS)
		return us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN);

	return 0;
}

static int us5182d_resume(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	struct us5182d_data *data = iio_priv(indio_dev);

	if (data->power_mode == US5182D_CONTINUOUS)
		return us5182d_shutdown_en(data,
					   ~US5182D_CFG0_SHUTDOWN_EN & 0xff);

	return 0;
}
#endif

static const struct dev_pm_ops us5182d_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(us5182d_suspend, us5182d_resume)
	SET_RUNTIME_PM_OPS(us5182d_suspend, us5182d_resume, NULL)
};

static const struct acpi_device_id us5182d_acpi_match[] = {
	{ "USD5182", 0},
	{}
};

MODULE_DEVICE_TABLE(acpi, us5182d_acpi_match);

static const struct i2c_device_id us5182d_id[] = {
		{"usd5182", 0},
		{}
};

MODULE_DEVICE_TABLE(i2c, us5182d_id);

static const struct of_device_id us5182d_of_match[] = {
	{ .compatible = "upisemi,usd5182" },
	{}
};
MODULE_DEVICE_TABLE(of, us5182d_of_match);

static struct i2c_driver us5182d_driver = {
	.driver = {
		.name = US5182D_DRV_NAME,
		.pm = &us5182d_pm_ops,
		.of_match_table = us5182d_of_match,
		.acpi_match_table = ACPI_PTR(us5182d_acpi_match),
	},
	.probe = us5182d_probe,
	.remove = us5182d_remove,
	.id_table = us5182d_id,

};
module_i2c_driver(us5182d_driver);

MODULE_AUTHOR("Adriana Reus <adriana.reus@intel.com>");
MODULE_DESCRIPTION("Driver for us5182d Proximity and Light Sensor");
MODULE_LICENSE("GPL v2");