summaryrefslogtreecommitdiffstats
path: root/drivers/iio/light/cm36651.c
blob: c8d7b5ea7e78c880b7bfc1cc1ff829c8c4c4b8aa (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
/*
 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
 * Author: Beomho Seo <beomho.seo@samsung.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General Public License version 2, as published
 * by the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/regulator/consumer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>

/* Slave address 0x19 for PS of 7 bit addressing protocol for I2C */
#define CM36651_I2C_ADDR_PS		0x19
/* Alert Response Address */
#define CM36651_ARA			0x0C

/* Ambient light sensor */
#define CM36651_CS_CONF1		0x00
#define CM36651_CS_CONF2		0x01
#define CM36651_ALS_WH_M		0x02
#define CM36651_ALS_WH_L		0x03
#define CM36651_ALS_WL_M		0x04
#define CM36651_ALS_WL_L		0x05
#define CM36651_CS_CONF3		0x06
#define CM36651_CS_CONF_REG_NUM		0x02

/* Proximity sensor */
#define CM36651_PS_CONF1		0x00
#define CM36651_PS_THD			0x01
#define CM36651_PS_CANC			0x02
#define CM36651_PS_CONF2		0x03
#define CM36651_PS_REG_NUM		0x04

/* CS_CONF1 command code */
#define CM36651_ALS_ENABLE		0x00
#define CM36651_ALS_DISABLE		0x01
#define CM36651_ALS_INT_EN		0x02
#define CM36651_ALS_THRES		0x04

/* CS_CONF2 command code */
#define CM36651_CS_CONF2_DEFAULT_BIT	0x08

/* CS_CONF3 channel integration time */
#define CM36651_CS_IT1			0x00 /* Integration time 80 msec */
#define CM36651_CS_IT2			0x40 /* Integration time 160 msec */
#define CM36651_CS_IT3			0x80 /* Integration time 320 msec */
#define CM36651_CS_IT4			0xC0 /* Integration time 640 msec */

/* PS_CONF1 command code */
#define CM36651_PS_ENABLE		0x00
#define CM36651_PS_DISABLE		0x01
#define CM36651_PS_INT_EN		0x02
#define CM36651_PS_PERS2		0x04
#define CM36651_PS_PERS3		0x08
#define CM36651_PS_PERS4		0x0C

/* PS_CONF1 command code: integration time */
#define CM36651_PS_IT1			0x00 /* Integration time 0.32 msec */
#define CM36651_PS_IT2			0x10 /* Integration time 0.42 msec */
#define CM36651_PS_IT3			0x20 /* Integration time 0.52 msec */
#define CM36651_PS_IT4			0x30 /* Integration time 0.64 msec */

/* PS_CONF1 command code: duty ratio */
#define CM36651_PS_DR1			0x00 /* Duty ratio 1/80 */
#define CM36651_PS_DR2			0x40 /* Duty ratio 1/160 */
#define CM36651_PS_DR3			0x80 /* Duty ratio 1/320 */
#define CM36651_PS_DR4			0xC0 /* Duty ratio 1/640 */

/* PS_THD command code */
#define CM36651_PS_INITIAL_THD		0x05

/* PS_CANC command code */
#define CM36651_PS_CANC_DEFAULT		0x00

/* PS_CONF2 command code */
#define CM36651_PS_HYS1			0x00
#define CM36651_PS_HYS2			0x01
#define CM36651_PS_SMART_PERS_EN	0x02
#define CM36651_PS_DIR_INT		0x04
#define CM36651_PS_MS			0x10

#define CM36651_CS_COLOR_NUM		4

#define CM36651_CLOSE_PROXIMITY		0x32
#define CM36651_FAR_PROXIMITY			0x33

#define CM36651_CS_INT_TIME_AVAIL	"0.08 0.16 0.32 0.64"
#define CM36651_PS_INT_TIME_AVAIL	"0.000320 0.000420 0.000520 0.000640"

enum cm36651_operation_mode {
	CM36651_LIGHT_EN,
	CM36651_PROXIMITY_EN,
	CM36651_PROXIMITY_EV_EN,
};

enum cm36651_light_channel_idx {
	CM36651_LIGHT_CHANNEL_IDX_RED,
	CM36651_LIGHT_CHANNEL_IDX_GREEN,
	CM36651_LIGHT_CHANNEL_IDX_BLUE,
	CM36651_LIGHT_CHANNEL_IDX_CLEAR,
};

enum cm36651_command {
	CM36651_CMD_READ_RAW_LIGHT,
	CM36651_CMD_READ_RAW_PROXIMITY,
	CM36651_CMD_PROX_EV_EN,
	CM36651_CMD_PROX_EV_DIS,
};

static const u8 cm36651_cs_reg[CM36651_CS_CONF_REG_NUM] = {
	CM36651_CS_CONF1,
	CM36651_CS_CONF2,
};

static const u8 cm36651_ps_reg[CM36651_PS_REG_NUM] = {
	CM36651_PS_CONF1,
	CM36651_PS_THD,
	CM36651_PS_CANC,
	CM36651_PS_CONF2,
};

struct cm36651_data {
	const struct cm36651_platform_data *pdata;
	struct i2c_client *client;
	struct i2c_client *ps_client;
	struct i2c_client *ara_client;
	struct mutex lock;
	struct regulator *vled_reg;
	unsigned long flags;
	int cs_int_time[CM36651_CS_COLOR_NUM];
	int ps_int_time;
	u8 cs_ctrl_regs[CM36651_CS_CONF_REG_NUM];
	u8 ps_ctrl_regs[CM36651_PS_REG_NUM];
	u16 color[CM36651_CS_COLOR_NUM];
};

static int cm36651_setup_reg(struct cm36651_data *cm36651)
{
	struct i2c_client *client = cm36651->client;
	struct i2c_client *ps_client = cm36651->ps_client;
	int i, ret;

	/* CS initialization */
	cm36651->cs_ctrl_regs[CM36651_CS_CONF1] = CM36651_ALS_ENABLE |
							     CM36651_ALS_THRES;
	cm36651->cs_ctrl_regs[CM36651_CS_CONF2] = CM36651_CS_CONF2_DEFAULT_BIT;

	for (i = 0; i < CM36651_CS_CONF_REG_NUM; i++) {
		ret = i2c_smbus_write_byte_data(client, cm36651_cs_reg[i],
						     cm36651->cs_ctrl_regs[i]);
		if (ret < 0)
			return ret;
	}

	/* PS initialization */
	cm36651->ps_ctrl_regs[CM36651_PS_CONF1] = CM36651_PS_ENABLE |
								CM36651_PS_IT2;
	cm36651->ps_ctrl_regs[CM36651_PS_THD] = CM36651_PS_INITIAL_THD;
	cm36651->ps_ctrl_regs[CM36651_PS_CANC] = CM36651_PS_CANC_DEFAULT;
	cm36651->ps_ctrl_regs[CM36651_PS_CONF2] = CM36651_PS_HYS2 |
				CM36651_PS_DIR_INT | CM36651_PS_SMART_PERS_EN;

	for (i = 0; i < CM36651_PS_REG_NUM; i++) {
		ret = i2c_smbus_write_byte_data(ps_client, cm36651_ps_reg[i],
						     cm36651->ps_ctrl_regs[i]);
		if (ret < 0)
			return ret;
	}

	/* Set shutdown mode */
	ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF1,
							  CM36651_ALS_DISABLE);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_write_byte_data(cm36651->ps_client,
					 CM36651_PS_CONF1, CM36651_PS_DISABLE);
	if (ret < 0)
		return ret;

	return 0;
}

static int cm36651_read_output(struct cm36651_data *cm36651,
				struct iio_chan_spec const *chan, int *val)
{
	struct i2c_client *client = cm36651->client;
	int ret = -EINVAL;

	switch (chan->type) {
	case IIO_LIGHT:
		*val = i2c_smbus_read_word_data(client, chan->address);
		if (*val < 0)
			return ret;

		ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF1,
							CM36651_ALS_DISABLE);
		if (ret < 0)
			return ret;

		ret = IIO_VAL_INT;
		break;
	case IIO_PROXIMITY:
		*val = i2c_smbus_read_byte(cm36651->ps_client);
		if (*val < 0)
			return ret;

		if (!test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) {
			ret = i2c_smbus_write_byte_data(cm36651->ps_client,
					CM36651_PS_CONF1, CM36651_PS_DISABLE);
			if (ret < 0)
				return ret;
		}

		ret = IIO_VAL_INT;
		break;
	default:
		break;
	}

	return ret;
}

static irqreturn_t cm36651_irq_handler(int irq, void *data)
{
	struct iio_dev *indio_dev = data;
	struct cm36651_data *cm36651 = iio_priv(indio_dev);
	struct i2c_client *client = cm36651->client;
	int ev_dir, ret;
	u64 ev_code;

	/*
	 * The PS INT pin is an active low signal that PS INT move logic low
	 * when the object is detect. Once the MCU host received the PS INT
	 * "LOW" signal, the Host needs to read the data at Alert Response
	 * Address(ARA) to clear the PS INT signal. After clearing the PS
	 * INT pin, the PS INT signal toggles from low to high.
	 */
	ret = i2c_smbus_read_byte(cm36651->ara_client);
	if (ret < 0) {
		dev_err(&client->dev,
				"%s: Data read failed: %d\n", __func__, ret);
		return IRQ_HANDLED;
	}
	switch (ret) {
	case CM36651_CLOSE_PROXIMITY:
		ev_dir = IIO_EV_DIR_RISING;
		break;
	case CM36651_FAR_PROXIMITY:
		ev_dir = IIO_EV_DIR_FALLING;
		break;
	default:
		dev_err(&client->dev,
			"%s: Data read wrong: %d\n", __func__, ret);
		return IRQ_HANDLED;
	}

	ev_code = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY,
				CM36651_CMD_READ_RAW_PROXIMITY,
				IIO_EV_TYPE_THRESH, ev_dir);

	iio_push_event(indio_dev, ev_code, iio_get_time_ns());

	return IRQ_HANDLED;
}

static int cm36651_set_operation_mode(struct cm36651_data *cm36651, int cmd)
{
	struct i2c_client *client = cm36651->client;
	struct i2c_client *ps_client = cm36651->ps_client;
	int ret = -EINVAL;

	switch (cmd) {
	case CM36651_CMD_READ_RAW_LIGHT:
		ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF1,
				cm36651->cs_ctrl_regs[CM36651_CS_CONF1]);
		break;
	case CM36651_CMD_READ_RAW_PROXIMITY:
		if (test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags))
			return CM36651_PROXIMITY_EV_EN;

		ret = i2c_smbus_write_byte_data(ps_client, CM36651_PS_CONF1,
				cm36651->ps_ctrl_regs[CM36651_PS_CONF1]);
		break;
	case CM36651_CMD_PROX_EV_EN:
		if (test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) {
			dev_err(&client->dev,
				"Already proximity event enable state\n");
			return ret;
		}
		set_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags);

		ret = i2c_smbus_write_byte_data(ps_client,
			cm36651_ps_reg[CM36651_PS_CONF1],
			CM36651_PS_INT_EN | CM36651_PS_PERS2 | CM36651_PS_IT2);

		if (ret < 0) {
			dev_err(&client->dev, "Proximity enable event failed\n");
			return ret;
		}
		break;
	case CM36651_CMD_PROX_EV_DIS:
		if (!test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) {
			dev_err(&client->dev,
				"Already proximity event disable state\n");
			return ret;
		}
		clear_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags);
		ret = i2c_smbus_write_byte_data(ps_client,
					CM36651_PS_CONF1, CM36651_PS_DISABLE);
		break;
	}

	if (ret < 0)
		dev_err(&client->dev, "Write register failed\n");

	return ret;
}

static int cm36651_read_channel(struct cm36651_data *cm36651,
				struct iio_chan_spec const *chan, int *val)
{
	struct i2c_client *client = cm36651->client;
	int cmd, ret;

	if (chan->type == IIO_LIGHT)
		cmd = CM36651_CMD_READ_RAW_LIGHT;
	else if (chan->type == IIO_PROXIMITY)
		cmd = CM36651_CMD_READ_RAW_PROXIMITY;
	else
		return -EINVAL;

	ret = cm36651_set_operation_mode(cm36651, cmd);
	if (ret < 0) {
		dev_err(&client->dev, "CM36651 set operation mode failed\n");
		return ret;
	}
	/* Delay for work after enable operation */
	msleep(50);
	ret = cm36651_read_output(cm36651, chan, val);
	if (ret < 0) {
		dev_err(&client->dev, "CM36651 read output failed\n");
		return ret;
	}

	return ret;
}

static int cm36651_read_int_time(struct cm36651_data *cm36651,
				struct iio_chan_spec const *chan, int *val2)
{
	switch (chan->type) {
	case IIO_LIGHT:
		if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT1)
			*val2 = 80000;
		else if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT2)
			*val2 = 160000;
		else if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT3)
			*val2 = 320000;
		else if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT4)
			*val2 = 640000;
		else
			return -EINVAL;
		break;
	case IIO_PROXIMITY:
		if (cm36651->ps_int_time == CM36651_PS_IT1)
			*val2 = 320;
		else if (cm36651->ps_int_time == CM36651_PS_IT2)
			*val2 = 420;
		else if (cm36651->ps_int_time == CM36651_PS_IT3)
			*val2 = 520;
		else if (cm36651->ps_int_time == CM36651_PS_IT4)
			*val2 = 640;
		else
			return -EINVAL;
		break;
	default:
		return -EINVAL;
	}

	return IIO_VAL_INT_PLUS_MICRO;
}

static int cm36651_write_int_time(struct cm36651_data *cm36651,
				struct iio_chan_spec const *chan, int val)
{
	struct i2c_client *client = cm36651->client;
	struct i2c_client *ps_client = cm36651->ps_client;
	int int_time, ret;

	switch (chan->type) {
	case IIO_LIGHT:
		if (val == 80000)
			int_time = CM36651_CS_IT1;
		else if (val == 160000)
			int_time = CM36651_CS_IT2;
		else if (val == 320000)
			int_time = CM36651_CS_IT3;
		else if (val == 640000)
			int_time = CM36651_CS_IT4;
		else
			return -EINVAL;

		ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF3,
					   int_time >> 2 * (chan->address));
		if (ret < 0) {
			dev_err(&client->dev, "CS integration time write failed\n");
			return ret;
		}
		cm36651->cs_int_time[chan->address] = int_time;
		break;
	case IIO_PROXIMITY:
		if (val == 320)
			int_time = CM36651_PS_IT1;
		else if (val == 420)
			int_time = CM36651_PS_IT2;
		else if (val == 520)
			int_time = CM36651_PS_IT3;
		else if (val == 640)
			int_time = CM36651_PS_IT4;
		else
			return -EINVAL;

		ret = i2c_smbus_write_byte_data(ps_client,
						CM36651_PS_CONF1, int_time);
		if (ret < 0) {
			dev_err(&client->dev, "PS integration time write failed\n");
			return ret;
		}
		cm36651->ps_int_time = int_time;
		break;
	default:
		return -EINVAL;
	}

	return ret;
}

static int cm36651_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan,
			    int *val, int *val2, long mask)
{
	struct cm36651_data *cm36651 = iio_priv(indio_dev);
	int ret;

	mutex_lock(&cm36651->lock);

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		ret = cm36651_read_channel(cm36651, chan, val);
		break;
	case IIO_CHAN_INFO_INT_TIME:
		*val = 0;
		ret = cm36651_read_int_time(cm36651, chan, val2);
		break;
	default:
		ret = -EINVAL;
	}

	mutex_unlock(&cm36651->lock);

	return ret;
}

static int cm36651_write_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int val, int val2, long mask)
{
	struct cm36651_data *cm36651 = iio_priv(indio_dev);
	struct i2c_client *client = cm36651->client;
	int ret = -EINVAL;

	if (mask == IIO_CHAN_INFO_INT_TIME) {
		ret = cm36651_write_int_time(cm36651, chan, val2);
		if (ret < 0)
			dev_err(&client->dev, "Integration time write failed\n");
	}

	return ret;
}

static int cm36651_read_prox_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 cm36651_data *cm36651 = iio_priv(indio_dev);

	*val = cm36651->ps_ctrl_regs[CM36651_PS_THD];

	return 0;
}

static int cm36651_write_prox_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 cm36651_data *cm36651 = iio_priv(indio_dev);
	struct i2c_client *client = cm36651->client;
	int ret;

	if (val < 3 || val > 255)
		return -EINVAL;

	cm36651->ps_ctrl_regs[CM36651_PS_THD] = val;
	ret = i2c_smbus_write_byte_data(cm36651->ps_client, CM36651_PS_THD,
					cm36651->ps_ctrl_regs[CM36651_PS_THD]);

	if (ret < 0) {
		dev_err(&client->dev, "PS threshold write failed: %d\n", ret);
		return ret;
	}

	return 0;
}

static int cm36651_write_prox_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 cm36651_data *cm36651 = iio_priv(indio_dev);
	int cmd, ret = -EINVAL;

	mutex_lock(&cm36651->lock);

	cmd = state ? CM36651_CMD_PROX_EV_EN : CM36651_CMD_PROX_EV_DIS;
	ret = cm36651_set_operation_mode(cm36651, cmd);

	mutex_unlock(&cm36651->lock);

	return ret;
}

static int cm36651_read_prox_event_config(struct iio_dev *indio_dev,
					const struct iio_chan_spec *chan,
					enum iio_event_type type,
					enum iio_event_direction dir)
{
	struct cm36651_data *cm36651 = iio_priv(indio_dev);
	int event_en;

	mutex_lock(&cm36651->lock);

	event_en = test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags);

	mutex_unlock(&cm36651->lock);

	return event_en;
}

#define CM36651_LIGHT_CHANNEL(_color, _idx) {		\
	.type = IIO_LIGHT,				\
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |	\
			BIT(IIO_CHAN_INFO_INT_TIME),	\
	.address = _idx,				\
	.modified = 1,					\
	.channel2 = IIO_MOD_LIGHT_##_color,		\
}							\

static const struct iio_event_spec cm36651_event_spec[] = {
	{
		.type = IIO_EV_TYPE_THRESH,
		.dir = IIO_EV_DIR_EITHER,
		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
				BIT(IIO_EV_INFO_ENABLE),
	}
};

static const struct iio_chan_spec cm36651_channels[] = {
	{
		.type = IIO_PROXIMITY,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
				BIT(IIO_CHAN_INFO_INT_TIME),
		.event_spec = cm36651_event_spec,
		.num_event_specs = ARRAY_SIZE(cm36651_event_spec),
	},
	CM36651_LIGHT_CHANNEL(RED, CM36651_LIGHT_CHANNEL_IDX_RED),
	CM36651_LIGHT_CHANNEL(GREEN, CM36651_LIGHT_CHANNEL_IDX_GREEN),
	CM36651_LIGHT_CHANNEL(BLUE, CM36651_LIGHT_CHANNEL_IDX_BLUE),
	CM36651_LIGHT_CHANNEL(CLEAR, CM36651_LIGHT_CHANNEL_IDX_CLEAR),
};

static IIO_CONST_ATTR(in_illuminance_integration_time_available,
					CM36651_CS_INT_TIME_AVAIL);
static IIO_CONST_ATTR(in_proximity_integration_time_available,
					CM36651_PS_INT_TIME_AVAIL);

static struct attribute *cm36651_attributes[] = {
	&iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
	&iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
	NULL,
};

static const struct attribute_group cm36651_attribute_group = {
	.attrs = cm36651_attributes
};

static const struct iio_info cm36651_info = {
	.driver_module		= THIS_MODULE,
	.read_raw		= &cm36651_read_raw,
	.write_raw		= &cm36651_write_raw,
	.read_event_value	= &cm36651_read_prox_thresh,
	.write_event_value	= &cm36651_write_prox_thresh,
	.read_event_config	= &cm36651_read_prox_event_config,
	.write_event_config	= &cm36651_write_prox_event_config,
	.attrs			= &cm36651_attribute_group,
};

static int cm36651_probe(struct i2c_client *client,
			     const struct i2c_device_id *id)
{
	struct cm36651_data *cm36651;
	struct iio_dev *indio_dev;
	int ret;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*cm36651));
	if (!indio_dev)
		return -ENOMEM;

	cm36651 = iio_priv(indio_dev);

	cm36651->vled_reg = devm_regulator_get(&client->dev, "vled");
	if (IS_ERR(cm36651->vled_reg)) {
		dev_err(&client->dev, "get regulator vled failed\n");
		return PTR_ERR(cm36651->vled_reg);
	}

	ret = regulator_enable(cm36651->vled_reg);
	if (ret) {
		dev_err(&client->dev, "enable regulator vled failed\n");
		return ret;
	}

	i2c_set_clientdata(client, indio_dev);

	cm36651->client = client;
	cm36651->ps_client = i2c_new_dummy(client->adapter,
						     CM36651_I2C_ADDR_PS);
	if (!cm36651->ps_client) {
		dev_err(&client->dev, "%s: new i2c device failed\n", __func__);
		ret = -ENODEV;
		goto error_disable_reg;
	}

	cm36651->ara_client = i2c_new_dummy(client->adapter, CM36651_ARA);
	if (!cm36651->ara_client) {
		dev_err(&client->dev, "%s: new i2c device failed\n", __func__);
		ret = -ENODEV;
		goto error_i2c_unregister_ps;
	}

	mutex_init(&cm36651->lock);
	indio_dev->dev.parent = &client->dev;
	indio_dev->channels = cm36651_channels;
	indio_dev->num_channels = ARRAY_SIZE(cm36651_channels);
	indio_dev->info = &cm36651_info;
	indio_dev->name = id->name;
	indio_dev->modes = INDIO_DIRECT_MODE;

	ret = cm36651_setup_reg(cm36651);
	if (ret) {
		dev_err(&client->dev, "%s: register setup failed\n", __func__);
		goto error_i2c_unregister_ara;
	}

	ret = request_threaded_irq(client->irq, NULL, cm36651_irq_handler,
					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
							"cm36651", indio_dev);
	if (ret) {
		dev_err(&client->dev, "%s: request irq failed\n", __func__);
		goto error_i2c_unregister_ara;
	}

	ret = iio_device_register(indio_dev);
	if (ret) {
		dev_err(&client->dev, "%s: regist device failed\n", __func__);
		goto error_free_irq;
	}

	return 0;

error_free_irq:
	free_irq(client->irq, indio_dev);
error_i2c_unregister_ara:
	i2c_unregister_device(cm36651->ara_client);
error_i2c_unregister_ps:
	i2c_unregister_device(cm36651->ps_client);
error_disable_reg:
	regulator_disable(cm36651->vled_reg);
	return ret;
}

static int cm36651_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	struct cm36651_data *cm36651 = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);
	regulator_disable(cm36651->vled_reg);
	free_irq(client->irq, indio_dev);
	i2c_unregister_device(cm36651->ps_client);
	i2c_unregister_device(cm36651->ara_client);

	return 0;
}

static const struct i2c_device_id cm36651_id[] = {
	{ "cm36651", 0 },
	{ }
};

MODULE_DEVICE_TABLE(i2c, cm36651_id);

static const struct of_device_id cm36651_of_match[] = {
	{ .compatible = "capella,cm36651" },
	{ }
};
MODULE_DEVICE_TABLE(of, cm36651_of_match);

static struct i2c_driver cm36651_driver = {
	.driver = {
		.name	= "cm36651",
		.of_match_table = cm36651_of_match,
	},
	.probe		= cm36651_probe,
	.remove		= cm36651_remove,
	.id_table	= cm36651_id,
};

module_i2c_driver(cm36651_driver);

MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
MODULE_DESCRIPTION("CM36651 proximity/ambient light sensor driver");
MODULE_LICENSE("GPL v2");