summaryrefslogtreecommitdiffstats
path: root/drivers/iio/light/isl29018.c
blob: 2689867467a8bf049df5ecb7d2fffc688fe507cf (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * A iio driver for the light sensor ISL 29018/29023/29035.
 *
 * IIO driver for monitoring ambient light intensity in luxi, proximity
 * sensing and infrared sensing.
 *
 * Copyright (c) 2010, NVIDIA Corporation.
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/acpi.h>

#define ISL29018_CONV_TIME_MS		100

#define ISL29018_REG_ADD_COMMAND1	0x00
#define ISL29018_CMD1_OPMODE_SHIFT	5
#define ISL29018_CMD1_OPMODE_MASK	(7 << ISL29018_CMD1_OPMODE_SHIFT)
#define ISL29018_CMD1_OPMODE_POWER_DOWN	0
#define ISL29018_CMD1_OPMODE_ALS_ONCE	1
#define ISL29018_CMD1_OPMODE_IR_ONCE	2
#define ISL29018_CMD1_OPMODE_PROX_ONCE	3

#define ISL29018_REG_ADD_COMMAND2	0x01
#define ISL29018_CMD2_RESOLUTION_SHIFT	2
#define ISL29018_CMD2_RESOLUTION_MASK	(0x3 << ISL29018_CMD2_RESOLUTION_SHIFT)

#define ISL29018_CMD2_RANGE_SHIFT	0
#define ISL29018_CMD2_RANGE_MASK	(0x3 << ISL29018_CMD2_RANGE_SHIFT)

#define ISL29018_CMD2_SCHEME_SHIFT	7
#define ISL29018_CMD2_SCHEME_MASK	(0x1 << ISL29018_CMD2_SCHEME_SHIFT)

#define ISL29018_REG_ADD_DATA_LSB	0x02
#define ISL29018_REG_ADD_DATA_MSB	0x03

#define ISL29018_REG_TEST		0x08
#define ISL29018_TEST_SHIFT		0
#define ISL29018_TEST_MASK		(0xFF << ISL29018_TEST_SHIFT)

#define ISL29035_REG_DEVICE_ID		0x0F
#define ISL29035_DEVICE_ID_SHIFT	0x03
#define ISL29035_DEVICE_ID_MASK		(0x7 << ISL29035_DEVICE_ID_SHIFT)
#define ISL29035_DEVICE_ID		0x5
#define ISL29035_BOUT_SHIFT		0x07
#define ISL29035_BOUT_MASK		(0x01 << ISL29035_BOUT_SHIFT)

enum isl29018_int_time {
	ISL29018_INT_TIME_16,
	ISL29018_INT_TIME_12,
	ISL29018_INT_TIME_8,
	ISL29018_INT_TIME_4,
};

static const unsigned int isl29018_int_utimes[3][4] = {
	{90000, 5630, 351, 21},
	{90000, 5600, 352, 22},
	{105000, 6500, 410, 25},
};

static const struct isl29018_scale {
	unsigned int scale;
	unsigned int uscale;
} isl29018_scales[4][4] = {
	{ {0, 15258}, {0, 61035}, {0, 244140}, {0, 976562} },
	{ {0, 244140}, {0, 976562}, {3, 906250}, {15, 625000} },
	{ {3, 906250}, {15, 625000}, {62, 500000}, {250, 0} },
	{ {62, 500000}, {250, 0}, {1000, 0}, {4000, 0} }
};

struct isl29018_chip {
	struct regmap		*regmap;
	struct mutex		lock;
	int			type;
	unsigned int		calibscale;
	unsigned int		ucalibscale;
	unsigned int		int_time;
	struct isl29018_scale	scale;
	int			prox_scheme;
	bool			suspended;
	struct regulator	*vcc_reg;
};

static int isl29018_set_integration_time(struct isl29018_chip *chip,
					 unsigned int utime)
{
	unsigned int i;
	int ret;
	unsigned int int_time, new_int_time;

	for (i = 0; i < ARRAY_SIZE(isl29018_int_utimes[chip->type]); ++i) {
		if (utime == isl29018_int_utimes[chip->type][i]) {
			new_int_time = i;
			break;
		}
	}

	if (i >= ARRAY_SIZE(isl29018_int_utimes[chip->type]))
		return -EINVAL;

	ret = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMAND2,
				 ISL29018_CMD2_RESOLUTION_MASK,
				 i << ISL29018_CMD2_RESOLUTION_SHIFT);
	if (ret < 0)
		return ret;

	/* Keep the same range when integration time changes */
	int_time = chip->int_time;
	for (i = 0; i < ARRAY_SIZE(isl29018_scales[int_time]); ++i) {
		if (chip->scale.scale == isl29018_scales[int_time][i].scale &&
		    chip->scale.uscale == isl29018_scales[int_time][i].uscale) {
			chip->scale = isl29018_scales[new_int_time][i];
			break;
		}
	}
	chip->int_time = new_int_time;

	return 0;
}

static int isl29018_set_scale(struct isl29018_chip *chip, int scale, int uscale)
{
	unsigned int i;
	int ret;
	struct isl29018_scale new_scale;

	for (i = 0; i < ARRAY_SIZE(isl29018_scales[chip->int_time]); ++i) {
		if (scale == isl29018_scales[chip->int_time][i].scale &&
		    uscale == isl29018_scales[chip->int_time][i].uscale) {
			new_scale = isl29018_scales[chip->int_time][i];
			break;
		}
	}

	if (i >= ARRAY_SIZE(isl29018_scales[chip->int_time]))
		return -EINVAL;

	ret = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMAND2,
				 ISL29018_CMD2_RANGE_MASK,
				 i << ISL29018_CMD2_RANGE_SHIFT);
	if (ret < 0)
		return ret;

	chip->scale = new_scale;

	return 0;
}

static int isl29018_read_sensor_input(struct isl29018_chip *chip, int mode)
{
	int status;
	unsigned int lsb;
	unsigned int msb;
	struct device *dev = regmap_get_device(chip->regmap);

	/* Set mode */
	status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1,
			      mode << ISL29018_CMD1_OPMODE_SHIFT);
	if (status) {
		dev_err(dev,
			"Error in setting operating mode err %d\n", status);
		return status;
	}
	msleep(ISL29018_CONV_TIME_MS);
	status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_LSB, &lsb);
	if (status < 0) {
		dev_err(dev,
			"Error in reading LSB DATA with err %d\n", status);
		return status;
	}

	status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_MSB, &msb);
	if (status < 0) {
		dev_err(dev,
			"Error in reading MSB DATA with error %d\n", status);
		return status;
	}
	dev_vdbg(dev, "MSB 0x%x and LSB 0x%x\n", msb, lsb);

	return (msb << 8) | lsb;
}

static int isl29018_read_lux(struct isl29018_chip *chip, int *lux)
{
	int lux_data;
	unsigned int data_x_range;

	lux_data = isl29018_read_sensor_input(chip,
					      ISL29018_CMD1_OPMODE_ALS_ONCE);
	if (lux_data < 0)
		return lux_data;

	data_x_range = lux_data * chip->scale.scale +
		       lux_data * chip->scale.uscale / 1000000;
	*lux = data_x_range * chip->calibscale +
	       data_x_range * chip->ucalibscale / 1000000;

	return 0;
}

static int isl29018_read_ir(struct isl29018_chip *chip, int *ir)
{
	int ir_data;

	ir_data = isl29018_read_sensor_input(chip,
					     ISL29018_CMD1_OPMODE_IR_ONCE);
	if (ir_data < 0)
		return ir_data;

	*ir = ir_data;

	return 0;
}

static int isl29018_read_proximity_ir(struct isl29018_chip *chip, int scheme,
				      int *near_ir)
{
	int status;
	int prox_data = -1;
	int ir_data = -1;
	struct device *dev = regmap_get_device(chip->regmap);

	/* Do proximity sensing with required scheme */
	status = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMAND2,
				    ISL29018_CMD2_SCHEME_MASK,
				    scheme << ISL29018_CMD2_SCHEME_SHIFT);
	if (status) {
		dev_err(dev, "Error in setting operating mode\n");
		return status;
	}

	prox_data = isl29018_read_sensor_input(chip,
					       ISL29018_CMD1_OPMODE_PROX_ONCE);
	if (prox_data < 0)
		return prox_data;

	if (scheme == 1) {
		*near_ir = prox_data;
		return 0;
	}

	ir_data = isl29018_read_sensor_input(chip,
					     ISL29018_CMD1_OPMODE_IR_ONCE);
	if (ir_data < 0)
		return ir_data;

	if (prox_data >= ir_data)
		*near_ir = prox_data - ir_data;
	else
		*near_ir = 0;

	return 0;
}

static ssize_t in_illuminance_scale_available_show
			(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct isl29018_chip *chip = iio_priv(indio_dev);
	unsigned int i;
	int len = 0;

	mutex_lock(&chip->lock);
	for (i = 0; i < ARRAY_SIZE(isl29018_scales[chip->int_time]); ++i)
		len += sprintf(buf + len, "%d.%06d ",
			       isl29018_scales[chip->int_time][i].scale,
			       isl29018_scales[chip->int_time][i].uscale);
	mutex_unlock(&chip->lock);

	buf[len - 1] = '\n';

	return len;
}

static ssize_t in_illuminance_integration_time_available_show
			(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct isl29018_chip *chip = iio_priv(indio_dev);
	unsigned int i;
	int len = 0;

	for (i = 0; i < ARRAY_SIZE(isl29018_int_utimes[chip->type]); ++i)
		len += sprintf(buf + len, "0.%06d ",
			       isl29018_int_utimes[chip->type][i]);

	buf[len - 1] = '\n';

	return len;
}

/*
 * From ISL29018 Data Sheet (FN6619.4, Oct 8, 2012) regarding the
 * infrared suppression:
 *
 *   Proximity Sensing Scheme: Bit 7. This bit programs the function
 * of the proximity detection. Logic 0 of this bit, Scheme 0, makes
 * full n (4, 8, 12, 16) bits (unsigned) proximity detection. The range
 * of Scheme 0 proximity count is from 0 to 2^n. Logic 1 of this bit,
 * Scheme 1, makes n-1 (3, 7, 11, 15) bits (2's complementary)
 * proximity_less_ambient detection. The range of Scheme 1
 * proximity count is from -2^(n-1) to 2^(n-1) . The sign bit is extended
 * for resolutions less than 16. While Scheme 0 has wider dynamic
 * range, Scheme 1 proximity detection is less affected by the
 * ambient IR noise variation.
 *
 * 0 Sensing IR from LED and ambient
 * 1 Sensing IR from LED with ambient IR rejection
 */
static ssize_t proximity_on_chip_ambient_infrared_suppression_show
			(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct isl29018_chip *chip = iio_priv(indio_dev);

	/*
	 * Return the "proximity scheme" i.e. if the chip does on chip
	 * infrared suppression (1 means perform on chip suppression)
	 */
	return sprintf(buf, "%d\n", chip->prox_scheme);
}

static ssize_t proximity_on_chip_ambient_infrared_suppression_store
			(struct device *dev, struct device_attribute *attr,
			 const char *buf, size_t count)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct isl29018_chip *chip = iio_priv(indio_dev);
	int val;

	if (kstrtoint(buf, 10, &val))
		return -EINVAL;
	if (!(val == 0 || val == 1))
		return -EINVAL;

	/*
	 * Get the "proximity scheme" i.e. if the chip does on chip
	 * infrared suppression (1 means perform on chip suppression)
	 */
	mutex_lock(&chip->lock);
	chip->prox_scheme = val;
	mutex_unlock(&chip->lock);

	return count;
}

static int isl29018_write_raw(struct iio_dev *indio_dev,
			      struct iio_chan_spec const *chan,
			      int val,
			      int val2,
			      long mask)
{
	struct isl29018_chip *chip = iio_priv(indio_dev);
	int ret = -EINVAL;

	mutex_lock(&chip->lock);
	if (chip->suspended) {
		ret = -EBUSY;
		goto write_done;
	}
	switch (mask) {
	case IIO_CHAN_INFO_CALIBSCALE:
		if (chan->type == IIO_LIGHT) {
			chip->calibscale = val;
			chip->ucalibscale = val2;
			ret = 0;
		}
		break;
	case IIO_CHAN_INFO_INT_TIME:
		if (chan->type == IIO_LIGHT && !val)
			ret = isl29018_set_integration_time(chip, val2);
		break;
	case IIO_CHAN_INFO_SCALE:
		if (chan->type == IIO_LIGHT)
			ret = isl29018_set_scale(chip, val, val2);
		break;
	default:
		break;
	}

write_done:
	mutex_unlock(&chip->lock);

	return ret;
}

static int isl29018_read_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int *val,
			     int *val2,
			     long mask)
{
	int ret = -EINVAL;
	struct isl29018_chip *chip = iio_priv(indio_dev);

	mutex_lock(&chip->lock);
	if (chip->suspended) {
		ret = -EBUSY;
		goto read_done;
	}
	switch (mask) {
	case IIO_CHAN_INFO_RAW:
	case IIO_CHAN_INFO_PROCESSED:
		switch (chan->type) {
		case IIO_LIGHT:
			ret = isl29018_read_lux(chip, val);
			break;
		case IIO_INTENSITY:
			ret = isl29018_read_ir(chip, val);
			break;
		case IIO_PROXIMITY:
			ret = isl29018_read_proximity_ir(chip,
							 chip->prox_scheme,
							 val);
			break;
		default:
			break;
		}
		if (!ret)
			ret = IIO_VAL_INT;
		break;
	case IIO_CHAN_INFO_INT_TIME:
		if (chan->type == IIO_LIGHT) {
			*val = 0;
			*val2 = isl29018_int_utimes[chip->type][chip->int_time];
			ret = IIO_VAL_INT_PLUS_MICRO;
		}
		break;
	case IIO_CHAN_INFO_SCALE:
		if (chan->type == IIO_LIGHT) {
			*val = chip->scale.scale;
			*val2 = chip->scale.uscale;
			ret = IIO_VAL_INT_PLUS_MICRO;
		}
		break;
	case IIO_CHAN_INFO_CALIBSCALE:
		if (chan->type == IIO_LIGHT) {
			*val = chip->calibscale;
			*val2 = chip->ucalibscale;
			ret = IIO_VAL_INT_PLUS_MICRO;
		}
		break;
	default:
		break;
	}

read_done:
	mutex_unlock(&chip->lock);

	return ret;
}

#define ISL29018_LIGHT_CHANNEL {					\
	.type = IIO_LIGHT,						\
	.indexed = 1,							\
	.channel = 0,							\
	.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |		\
	BIT(IIO_CHAN_INFO_CALIBSCALE) |					\
	BIT(IIO_CHAN_INFO_SCALE) |					\
	BIT(IIO_CHAN_INFO_INT_TIME),					\
}

#define ISL29018_IR_CHANNEL {						\
	.type = IIO_INTENSITY,						\
	.modified = 1,							\
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),			\
	.channel2 = IIO_MOD_LIGHT_IR,					\
}

#define ISL29018_PROXIMITY_CHANNEL {					\
	.type = IIO_PROXIMITY,						\
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),			\
}

static const struct iio_chan_spec isl29018_channels[] = {
	ISL29018_LIGHT_CHANNEL,
	ISL29018_IR_CHANNEL,
	ISL29018_PROXIMITY_CHANNEL,
};

static const struct iio_chan_spec isl29023_channels[] = {
	ISL29018_LIGHT_CHANNEL,
	ISL29018_IR_CHANNEL,
};

static IIO_DEVICE_ATTR_RO(in_illuminance_integration_time_available, 0);
static IIO_DEVICE_ATTR_RO(in_illuminance_scale_available, 0);
static IIO_DEVICE_ATTR_RW(proximity_on_chip_ambient_infrared_suppression, 0);

#define ISL29018_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr)

static struct attribute *isl29018_attributes[] = {
	ISL29018_DEV_ATTR(in_illuminance_scale_available),
	ISL29018_DEV_ATTR(in_illuminance_integration_time_available),
	ISL29018_DEV_ATTR(proximity_on_chip_ambient_infrared_suppression),
	NULL
};

static struct attribute *isl29023_attributes[] = {
	ISL29018_DEV_ATTR(in_illuminance_scale_available),
	ISL29018_DEV_ATTR(in_illuminance_integration_time_available),
	NULL
};

static const struct attribute_group isl29018_group = {
	.attrs = isl29018_attributes,
};

static const struct attribute_group isl29023_group = {
	.attrs = isl29023_attributes,
};

enum {
	isl29018,
	isl29023,
	isl29035,
};

static int isl29018_chip_init(struct isl29018_chip *chip)
{
	int status;
	struct device *dev = regmap_get_device(chip->regmap);

	if (chip->type == isl29035) {
		unsigned int id;

		status = regmap_read(chip->regmap, ISL29035_REG_DEVICE_ID, &id);
		if (status < 0) {
			dev_err(dev,
				"Error reading ID register with error %d\n",
				status);
			return status;
		}

		id = (id & ISL29035_DEVICE_ID_MASK) >> ISL29035_DEVICE_ID_SHIFT;

		if (id != ISL29035_DEVICE_ID)
			return -ENODEV;

		/* Clear brownout bit */
		status = regmap_update_bits(chip->regmap,
					    ISL29035_REG_DEVICE_ID,
					    ISL29035_BOUT_MASK, 0);
		if (status < 0)
			return status;
	}

	/*
	 * Code added per Intersil Application Note 1534:
	 *     When VDD sinks to approximately 1.8V or below, some of
	 * the part's registers may change their state. When VDD
	 * recovers to 2.25V (or greater), the part may thus be in an
	 * unknown mode of operation. The user can return the part to
	 * a known mode of operation either by (a) setting VDD = 0V for
	 * 1 second or more and then powering back up with a slew rate
	 * of 0.5V/ms or greater, or (b) via I2C disable all ALS/PROX
	 * conversions, clear the test registers, and then rewrite all
	 * registers to the desired values.
	 * ...
	 * For ISL29011, ISL29018, ISL29021, ISL29023
	 * 1. Write 0x00 to register 0x08 (TEST)
	 * 2. Write 0x00 to register 0x00 (CMD1)
	 * 3. Rewrite all registers to the desired values
	 *
	 * ISL29018 Data Sheet (FN6619.1, Feb 11, 2010) essentially says
	 * the same thing EXCEPT the data sheet asks for a 1ms delay after
	 * writing the CMD1 register.
	 */
	status = regmap_write(chip->regmap, ISL29018_REG_TEST, 0x0);
	if (status < 0) {
		dev_err(dev, "Failed to clear isl29018 TEST reg.(%d)\n",
			status);
		return status;
	}

	/*
	 * See Intersil AN1534 comments above.
	 * "Operating Mode" (COMMAND1) register is reprogrammed when
	 * data is read from the device.
	 */
	status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1, 0);
	if (status < 0) {
		dev_err(dev, "Failed to clear isl29018 CMD1 reg.(%d)\n",
			status);
		return status;
	}

	usleep_range(1000, 2000);	/* per data sheet, page 10 */

	/* Set defaults */
	status = isl29018_set_scale(chip, chip->scale.scale,
				    chip->scale.uscale);
	if (status < 0) {
		dev_err(dev, "Init of isl29018 fails\n");
		return status;
	}

	status = isl29018_set_integration_time(chip,
			isl29018_int_utimes[chip->type][chip->int_time]);
	if (status < 0)
		dev_err(dev, "Init of isl29018 fails\n");

	return status;
}

static const struct iio_info isl29018_info = {
	.attrs = &isl29018_group,
	.read_raw = isl29018_read_raw,
	.write_raw = isl29018_write_raw,
};

static const struct iio_info isl29023_info = {
	.attrs = &isl29023_group,
	.read_raw = isl29018_read_raw,
	.write_raw = isl29018_write_raw,
};

static bool isl29018_is_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case ISL29018_REG_ADD_DATA_LSB:
	case ISL29018_REG_ADD_DATA_MSB:
	case ISL29018_REG_ADD_COMMAND1:
	case ISL29018_REG_TEST:
	case ISL29035_REG_DEVICE_ID:
		return true;
	default:
		return false;
	}
}

static const struct regmap_config isl29018_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.volatile_reg = isl29018_is_volatile_reg,
	.max_register = ISL29018_REG_TEST,
	.num_reg_defaults_raw = ISL29018_REG_TEST + 1,
	.cache_type = REGCACHE_RBTREE,
};

static const struct regmap_config isl29035_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.volatile_reg = isl29018_is_volatile_reg,
	.max_register = ISL29035_REG_DEVICE_ID,
	.num_reg_defaults_raw = ISL29035_REG_DEVICE_ID + 1,
	.cache_type = REGCACHE_RBTREE,
};

struct isl29018_chip_info {
	const struct iio_chan_spec *channels;
	int num_channels;
	const struct iio_info *indio_info;
	const struct regmap_config *regmap_cfg;
};

static const struct isl29018_chip_info isl29018_chip_info_tbl[] = {
	[isl29018] = {
		.channels = isl29018_channels,
		.num_channels = ARRAY_SIZE(isl29018_channels),
		.indio_info = &isl29018_info,
		.regmap_cfg = &isl29018_regmap_config,
	},
	[isl29023] = {
		.channels = isl29023_channels,
		.num_channels = ARRAY_SIZE(isl29023_channels),
		.indio_info = &isl29023_info,
		.regmap_cfg = &isl29018_regmap_config,
	},
	[isl29035] = {
		.channels = isl29023_channels,
		.num_channels = ARRAY_SIZE(isl29023_channels),
		.indio_info = &isl29023_info,
		.regmap_cfg = &isl29035_regmap_config,
	},
};

static const char *isl29018_match_acpi_device(struct device *dev, int *data)
{
	const struct acpi_device_id *id;

	id = acpi_match_device(dev->driver->acpi_match_table, dev);

	if (!id)
		return NULL;

	*data = (int)id->driver_data;

	return dev_name(dev);
}

static void isl29018_disable_regulator_action(void *_data)
{
	struct isl29018_chip *chip = _data;
	int err;

	err = regulator_disable(chip->vcc_reg);
	if (err)
		pr_err("failed to disable isl29018's VCC regulator!\n");
}

static int isl29018_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct isl29018_chip *chip;
	struct iio_dev *indio_dev;
	int err;
	const char *name = NULL;
	int dev_id = 0;

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

	chip = iio_priv(indio_dev);

	i2c_set_clientdata(client, indio_dev);

	if (id) {
		name = id->name;
		dev_id = id->driver_data;
	}

	if (ACPI_HANDLE(&client->dev))
		name = isl29018_match_acpi_device(&client->dev, &dev_id);

	mutex_init(&chip->lock);

	chip->type = dev_id;
	chip->calibscale = 1;
	chip->ucalibscale = 0;
	chip->int_time = ISL29018_INT_TIME_16;
	chip->scale = isl29018_scales[chip->int_time][0];
	chip->suspended = false;

	chip->vcc_reg = devm_regulator_get(&client->dev, "vcc");
	if (IS_ERR(chip->vcc_reg))
		return dev_err_probe(&client->dev, PTR_ERR(chip->vcc_reg),
				     "failed to get VCC regulator!\n");

	err = regulator_enable(chip->vcc_reg);
	if (err) {
		dev_err(&client->dev, "failed to enable VCC regulator!\n");
		return err;
	}

	err = devm_add_action_or_reset(&client->dev, isl29018_disable_regulator_action,
				 chip);
	if (err) {
		dev_err(&client->dev, "failed to setup regulator cleanup action!\n");
		return err;
	}

	chip->regmap = devm_regmap_init_i2c(client,
				isl29018_chip_info_tbl[dev_id].regmap_cfg);
	if (IS_ERR(chip->regmap)) {
		err = PTR_ERR(chip->regmap);
		dev_err(&client->dev, "regmap initialization fails: %d\n", err);
		return err;
	}

	err = isl29018_chip_init(chip);
	if (err)
		return err;

	indio_dev->info = isl29018_chip_info_tbl[dev_id].indio_info;
	indio_dev->channels = isl29018_chip_info_tbl[dev_id].channels;
	indio_dev->num_channels = isl29018_chip_info_tbl[dev_id].num_channels;
	indio_dev->name = name;
	indio_dev->modes = INDIO_DIRECT_MODE;

	return devm_iio_device_register(&client->dev, indio_dev);
}

#ifdef CONFIG_PM_SLEEP
static int isl29018_suspend(struct device *dev)
{
	struct isl29018_chip *chip = iio_priv(dev_get_drvdata(dev));
	int ret;

	mutex_lock(&chip->lock);

	/*
	 * Since this driver uses only polling commands, we are by default in
	 * auto shutdown (ie, power-down) mode.
	 * So we do not have much to do here.
	 */
	chip->suspended = true;
	ret = regulator_disable(chip->vcc_reg);
	if (ret)
		dev_err(dev, "failed to disable VCC regulator\n");

	mutex_unlock(&chip->lock);

	return ret;
}

static int isl29018_resume(struct device *dev)
{
	struct isl29018_chip *chip = iio_priv(dev_get_drvdata(dev));
	int err;

	mutex_lock(&chip->lock);

	err = regulator_enable(chip->vcc_reg);
	if (err) {
		dev_err(dev, "failed to enable VCC regulator\n");
		mutex_unlock(&chip->lock);
		return err;
	}

	err = isl29018_chip_init(chip);
	if (!err)
		chip->suspended = false;

	mutex_unlock(&chip->lock);

	return err;
}

static SIMPLE_DEV_PM_OPS(isl29018_pm_ops, isl29018_suspend, isl29018_resume);
#define ISL29018_PM_OPS (&isl29018_pm_ops)
#else
#define ISL29018_PM_OPS NULL
#endif

#ifdef CONFIG_ACPI
static const struct acpi_device_id isl29018_acpi_match[] = {
	{"ISL29018", isl29018},
	{"ISL29023", isl29023},
	{"ISL29035", isl29035},
	{},
};
MODULE_DEVICE_TABLE(acpi, isl29018_acpi_match);
#endif

static const struct i2c_device_id isl29018_id[] = {
	{"isl29018", isl29018},
	{"isl29023", isl29023},
	{"isl29035", isl29035},
	{}
};
MODULE_DEVICE_TABLE(i2c, isl29018_id);

static const struct of_device_id isl29018_of_match[] = {
	{ .compatible = "isil,isl29018", },
	{ .compatible = "isil,isl29023", },
	{ .compatible = "isil,isl29035", },
	{ },
};
MODULE_DEVICE_TABLE(of, isl29018_of_match);

static struct i2c_driver isl29018_driver = {
	.driver	 = {
			.name = "isl29018",
			.acpi_match_table = ACPI_PTR(isl29018_acpi_match),
			.pm = ISL29018_PM_OPS,
			.of_match_table = isl29018_of_match,
		    },
	.probe	 = isl29018_probe,
	.id_table = isl29018_id,
};
module_i2c_driver(isl29018_driver);

MODULE_DESCRIPTION("ISL29018 Ambient Light Sensor driver");
MODULE_LICENSE("GPL");