summaryrefslogtreecommitdiff
path: root/drivers/iio/light/tsl2563.c
blob: 951f35ef3f41de994dd88f5339c7eb862ae3eb93 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * drivers/iio/light/tsl2563.c
 *
 * Copyright (C) 2008 Nokia Corporation
 *
 * Written by Timo O. Karjalainen <timo.o.karjalainen@nokia.com>
 * Contact: Amit Kucheria <amit.kucheria@verdurent.com>
 *
 * Converted to IIO driver
 * Amit Kucheria <amit.kucheria@verdurent.com>
 */

#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/property.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/sched.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/err.h>
#include <linux/slab.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#include <linux/platform_data/tsl2563.h>

/* Use this many bits for fraction part. */
#define ADC_FRAC_BITS		14

/* Given number of 1/10000's in ADC_FRAC_BITS precision. */
#define FRAC10K(f)		(((f) * (1L << (ADC_FRAC_BITS))) / (10000))

/* Bits used for fraction in calibration coefficients.*/
#define CALIB_FRAC_BITS		10
/* 0.5 in CALIB_FRAC_BITS precision */
#define CALIB_FRAC_HALF		(1 << (CALIB_FRAC_BITS - 1))
/* Make a fraction from a number n that was multiplied with b. */
#define CALIB_FRAC(n, b)	(((n) << CALIB_FRAC_BITS) / (b))
/* Decimal 10^(digits in sysfs presentation) */
#define CALIB_BASE_SYSFS	1000

#define TSL2563_CMD		0x80
#define TSL2563_CLEARINT	0x40

#define TSL2563_REG_CTRL	0x00
#define TSL2563_REG_TIMING	0x01
#define TSL2563_REG_LOWLOW	0x02 /* data0 low threshold, 2 bytes */
#define TSL2563_REG_LOWHIGH	0x03
#define TSL2563_REG_HIGHLOW	0x04 /* data0 high threshold, 2 bytes */
#define TSL2563_REG_HIGHHIGH	0x05
#define TSL2563_REG_INT		0x06
#define TSL2563_REG_ID		0x0a
#define TSL2563_REG_DATA0LOW	0x0c /* broadband sensor value, 2 bytes */
#define TSL2563_REG_DATA0HIGH	0x0d
#define TSL2563_REG_DATA1LOW	0x0e /* infrared sensor value, 2 bytes */
#define TSL2563_REG_DATA1HIGH	0x0f

#define TSL2563_CMD_POWER_ON	0x03
#define TSL2563_CMD_POWER_OFF	0x00
#define TSL2563_CTRL_POWER_MASK	0x03

#define TSL2563_TIMING_13MS	0x00
#define TSL2563_TIMING_100MS	0x01
#define TSL2563_TIMING_400MS	0x02
#define TSL2563_TIMING_MASK	0x03
#define TSL2563_TIMING_GAIN16	0x10
#define TSL2563_TIMING_GAIN1	0x00

#define TSL2563_INT_DISABLED	0x00
#define TSL2563_INT_LEVEL	0x10
#define TSL2563_INT_PERSIST(n)	((n) & 0x0F)

struct tsl2563_gainlevel_coeff {
	u8 gaintime;
	u16 min;
	u16 max;
};

static const struct tsl2563_gainlevel_coeff tsl2563_gainlevel_table[] = {
	{
		.gaintime	= TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN16,
		.min		= 0,
		.max		= 65534,
	}, {
		.gaintime	= TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN1,
		.min		= 2048,
		.max		= 65534,
	}, {
		.gaintime	= TSL2563_TIMING_100MS | TSL2563_TIMING_GAIN1,
		.min		= 4095,
		.max		= 37177,
	}, {
		.gaintime	= TSL2563_TIMING_13MS | TSL2563_TIMING_GAIN1,
		.min		= 3000,
		.max		= 65535,
	},
};

struct tsl2563_chip {
	struct mutex		lock;
	struct i2c_client	*client;
	struct delayed_work	poweroff_work;

	/* Remember state for suspend and resume functions */
	bool suspended;

	struct tsl2563_gainlevel_coeff const *gainlevel;

	u16			low_thres;
	u16			high_thres;
	u8			intr;
	bool			int_enabled;

	/* Calibration coefficients */
	u32			calib0;
	u32			calib1;
	int			cover_comp_gain;

	/* Cache current values, to be returned while suspended */
	u32			data0;
	u32			data1;
};

static int tsl2563_set_power(struct tsl2563_chip *chip, int on)
{
	struct i2c_client *client = chip->client;
	u8 cmd;

	cmd = on ? TSL2563_CMD_POWER_ON : TSL2563_CMD_POWER_OFF;
	return i2c_smbus_write_byte_data(client,
					 TSL2563_CMD | TSL2563_REG_CTRL, cmd);
}

/*
 * Return value is 0 for off, 1 for on, or a negative error
 * code if reading failed.
 */
static int tsl2563_get_power(struct tsl2563_chip *chip)
{
	struct i2c_client *client = chip->client;
	int ret;

	ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_CTRL);
	if (ret < 0)
		return ret;

	return (ret & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON;
}

static int tsl2563_configure(struct tsl2563_chip *chip)
{
	int ret;

	ret = i2c_smbus_write_byte_data(chip->client,
			TSL2563_CMD | TSL2563_REG_TIMING,
			chip->gainlevel->gaintime);
	if (ret)
		goto error_ret;
	ret = i2c_smbus_write_byte_data(chip->client,
			TSL2563_CMD | TSL2563_REG_HIGHLOW,
			chip->high_thres & 0xFF);
	if (ret)
		goto error_ret;
	ret = i2c_smbus_write_byte_data(chip->client,
			TSL2563_CMD | TSL2563_REG_HIGHHIGH,
			(chip->high_thres >> 8) & 0xFF);
	if (ret)
		goto error_ret;
	ret = i2c_smbus_write_byte_data(chip->client,
			TSL2563_CMD | TSL2563_REG_LOWLOW,
			chip->low_thres & 0xFF);
	if (ret)
		goto error_ret;
	ret = i2c_smbus_write_byte_data(chip->client,
			TSL2563_CMD | TSL2563_REG_LOWHIGH,
			(chip->low_thres >> 8) & 0xFF);
/*
 * Interrupt register is automatically written anyway if it is relevant
 * so is not here.
 */
error_ret:
	return ret;
}

static void tsl2563_poweroff_work(struct work_struct *work)
{
	struct tsl2563_chip *chip =
		container_of(work, struct tsl2563_chip, poweroff_work.work);
	tsl2563_set_power(chip, 0);
}

static int tsl2563_detect(struct tsl2563_chip *chip)
{
	int ret;

	ret = tsl2563_set_power(chip, 1);
	if (ret)
		return ret;

	ret = tsl2563_get_power(chip);
	if (ret < 0)
		return ret;

	return ret ? 0 : -ENODEV;
}

static int tsl2563_read_id(struct tsl2563_chip *chip, u8 *id)
{
	struct i2c_client *client = chip->client;
	int ret;

	ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_ID);
	if (ret < 0)
		return ret;

	*id = ret;

	return 0;
}

/*
 * "Normalized" ADC value is one obtained with 400ms of integration time and
 * 16x gain. This function returns the number of bits of shift needed to
 * convert between normalized values and HW values obtained using given
 * timing and gain settings.
 */
static int tsl2563_adc_shiftbits(u8 timing)
{
	int shift = 0;

	switch (timing & TSL2563_TIMING_MASK) {
	case TSL2563_TIMING_13MS:
		shift += 5;
		break;
	case TSL2563_TIMING_100MS:
		shift += 2;
		break;
	case TSL2563_TIMING_400MS:
		/* no-op */
		break;
	}

	if (!(timing & TSL2563_TIMING_GAIN16))
		shift += 4;

	return shift;
}

/* Convert a HW ADC value to normalized scale. */
static u32 tsl2563_normalize_adc(u16 adc, u8 timing)
{
	return adc << tsl2563_adc_shiftbits(timing);
}

static void tsl2563_wait_adc(struct tsl2563_chip *chip)
{
	unsigned int delay;

	switch (chip->gainlevel->gaintime & TSL2563_TIMING_MASK) {
	case TSL2563_TIMING_13MS:
		delay = 14;
		break;
	case TSL2563_TIMING_100MS:
		delay = 101;
		break;
	default:
		delay = 402;
	}
	/*
	 * TODO: Make sure that we wait at least required delay but why we
	 * have to extend it one tick more?
	 */
	schedule_timeout_interruptible(msecs_to_jiffies(delay) + 2);
}

static int tsl2563_adjust_gainlevel(struct tsl2563_chip *chip, u16 adc)
{
	struct i2c_client *client = chip->client;

	if (adc > chip->gainlevel->max || adc < chip->gainlevel->min) {

		(adc > chip->gainlevel->max) ?
			chip->gainlevel++ : chip->gainlevel--;

		i2c_smbus_write_byte_data(client,
					  TSL2563_CMD | TSL2563_REG_TIMING,
					  chip->gainlevel->gaintime);

		tsl2563_wait_adc(chip);
		tsl2563_wait_adc(chip);

		return 1;
	} else
		return 0;
}

static int tsl2563_get_adc(struct tsl2563_chip *chip)
{
	struct i2c_client *client = chip->client;
	u16 adc0, adc1;
	int retry = 1;
	int ret = 0;

	if (chip->suspended)
		goto out;

	if (!chip->int_enabled) {
		cancel_delayed_work_sync(&chip->poweroff_work);

		if (!tsl2563_get_power(chip)) {
			ret = tsl2563_set_power(chip, 1);
			if (ret)
				goto out;
			ret = tsl2563_configure(chip);
			if (ret)
				goto out;
			tsl2563_wait_adc(chip);
		}
	}

	while (retry) {
		ret = i2c_smbus_read_word_data(client,
				TSL2563_CMD | TSL2563_REG_DATA0LOW);
		if (ret < 0)
			goto out;
		adc0 = ret;

		ret = i2c_smbus_read_word_data(client,
				TSL2563_CMD | TSL2563_REG_DATA1LOW);
		if (ret < 0)
			goto out;
		adc1 = ret;

		retry = tsl2563_adjust_gainlevel(chip, adc0);
	}

	chip->data0 = tsl2563_normalize_adc(adc0, chip->gainlevel->gaintime);
	chip->data1 = tsl2563_normalize_adc(adc1, chip->gainlevel->gaintime);

	if (!chip->int_enabled)
		schedule_delayed_work(&chip->poweroff_work, 5 * HZ);

	ret = 0;
out:
	return ret;
}

static inline int tsl2563_calib_to_sysfs(u32 calib)
{
	return (int) (((calib * CALIB_BASE_SYSFS) +
		       CALIB_FRAC_HALF) >> CALIB_FRAC_BITS);
}

static inline u32 tsl2563_calib_from_sysfs(int value)
{
	return (((u32) value) << CALIB_FRAC_BITS) / CALIB_BASE_SYSFS;
}

/*
 * Conversions between lux and ADC values.
 *
 * The basic formula is lux = c0 * adc0 - c1 * adc1, where c0 and c1 are
 * appropriate constants. Different constants are needed for different
 * kinds of light, determined by the ratio adc1/adc0 (basically the ratio
 * of the intensities in infrared and visible wavelengths). lux_table below
 * lists the upper threshold of the adc1/adc0 ratio and the corresponding
 * constants.
 */

struct tsl2563_lux_coeff {
	unsigned long ch_ratio;
	unsigned long ch0_coeff;
	unsigned long ch1_coeff;
};

static const struct tsl2563_lux_coeff lux_table[] = {
	{
		.ch_ratio	= FRAC10K(1300),
		.ch0_coeff	= FRAC10K(315),
		.ch1_coeff	= FRAC10K(262),
	}, {
		.ch_ratio	= FRAC10K(2600),
		.ch0_coeff	= FRAC10K(337),
		.ch1_coeff	= FRAC10K(430),
	}, {
		.ch_ratio	= FRAC10K(3900),
		.ch0_coeff	= FRAC10K(363),
		.ch1_coeff	= FRAC10K(529),
	}, {
		.ch_ratio	= FRAC10K(5200),
		.ch0_coeff	= FRAC10K(392),
		.ch1_coeff	= FRAC10K(605),
	}, {
		.ch_ratio	= FRAC10K(6500),
		.ch0_coeff	= FRAC10K(229),
		.ch1_coeff	= FRAC10K(291),
	}, {
		.ch_ratio	= FRAC10K(8000),
		.ch0_coeff	= FRAC10K(157),
		.ch1_coeff	= FRAC10K(180),
	}, {
		.ch_ratio	= FRAC10K(13000),
		.ch0_coeff	= FRAC10K(34),
		.ch1_coeff	= FRAC10K(26),
	}, {
		.ch_ratio	= ULONG_MAX,
		.ch0_coeff	= 0,
		.ch1_coeff	= 0,
	},
};

/* Convert normalized, scaled ADC values to lux. */
static unsigned int tsl2563_adc_to_lux(u32 adc0, u32 adc1)
{
	const struct tsl2563_lux_coeff *lp = lux_table;
	unsigned long ratio, lux, ch0 = adc0, ch1 = adc1;

	ratio = ch0 ? ((ch1 << ADC_FRAC_BITS) / ch0) : ULONG_MAX;

	while (lp->ch_ratio < ratio)
		lp++;

	lux = ch0 * lp->ch0_coeff - ch1 * lp->ch1_coeff;

	return (unsigned int) (lux >> ADC_FRAC_BITS);
}

/* Apply calibration coefficient to ADC count. */
static u32 tsl2563_calib_adc(u32 adc, u32 calib)
{
	unsigned long scaled = adc;

	scaled *= calib;
	scaled >>= CALIB_FRAC_BITS;

	return (u32) scaled;
}

static int tsl2563_write_raw(struct iio_dev *indio_dev,
			       struct iio_chan_spec const *chan,
			       int val,
			       int val2,
			       long mask)
{
	struct tsl2563_chip *chip = iio_priv(indio_dev);

	if (mask != IIO_CHAN_INFO_CALIBSCALE)
		return -EINVAL;
	if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
		chip->calib0 = tsl2563_calib_from_sysfs(val);
	else if (chan->channel2 == IIO_MOD_LIGHT_IR)
		chip->calib1 = tsl2563_calib_from_sysfs(val);
	else
		return -EINVAL;

	return 0;
}

static int tsl2563_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan,
			    int *val,
			    int *val2,
			    long mask)
{
	int ret = -EINVAL;
	u32 calib0, calib1;
	struct tsl2563_chip *chip = iio_priv(indio_dev);

	mutex_lock(&chip->lock);
	switch (mask) {
	case IIO_CHAN_INFO_RAW:
	case IIO_CHAN_INFO_PROCESSED:
		switch (chan->type) {
		case IIO_LIGHT:
			ret = tsl2563_get_adc(chip);
			if (ret)
				goto error_ret;
			calib0 = tsl2563_calib_adc(chip->data0, chip->calib0) *
				chip->cover_comp_gain;
			calib1 = tsl2563_calib_adc(chip->data1, chip->calib1) *
				chip->cover_comp_gain;
			*val = tsl2563_adc_to_lux(calib0, calib1);
			ret = IIO_VAL_INT;
			break;
		case IIO_INTENSITY:
			ret = tsl2563_get_adc(chip);
			if (ret)
				goto error_ret;
			if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
				*val = chip->data0;
			else
				*val = chip->data1;
			ret = IIO_VAL_INT;
			break;
		default:
			break;
		}
		break;

	case IIO_CHAN_INFO_CALIBSCALE:
		if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
			*val = tsl2563_calib_to_sysfs(chip->calib0);
		else
			*val = tsl2563_calib_to_sysfs(chip->calib1);
		ret = IIO_VAL_INT;
		break;
	default:
		ret = -EINVAL;
		goto error_ret;
	}

error_ret:
	mutex_unlock(&chip->lock);
	return ret;
}

static const struct iio_event_spec tsl2563_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 tsl2563_channels[] = {
	{
		.type = IIO_LIGHT,
		.indexed = 1,
		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
		.channel = 0,
	}, {
		.type = IIO_INTENSITY,
		.modified = 1,
		.channel2 = IIO_MOD_LIGHT_BOTH,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
		BIT(IIO_CHAN_INFO_CALIBSCALE),
		.event_spec = tsl2563_events,
		.num_event_specs = ARRAY_SIZE(tsl2563_events),
	}, {
		.type = IIO_INTENSITY,
		.modified = 1,
		.channel2 = IIO_MOD_LIGHT_IR,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
		BIT(IIO_CHAN_INFO_CALIBSCALE),
	}
};

static int tsl2563_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 tsl2563_chip *chip = iio_priv(indio_dev);

	switch (dir) {
	case IIO_EV_DIR_RISING:
		*val = chip->high_thres;
		break;
	case IIO_EV_DIR_FALLING:
		*val = chip->low_thres;
		break;
	default:
		return -EINVAL;
	}

	return IIO_VAL_INT;
}

static int tsl2563_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 tsl2563_chip *chip = iio_priv(indio_dev);
	int ret;
	u8 address;

	if (dir == IIO_EV_DIR_RISING)
		address = TSL2563_REG_HIGHLOW;
	else
		address = TSL2563_REG_LOWLOW;
	mutex_lock(&chip->lock);
	ret = i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | address,
					val & 0xFF);
	if (ret)
		goto error_ret;
	ret = i2c_smbus_write_byte_data(chip->client,
					TSL2563_CMD | (address + 1),
					(val >> 8) & 0xFF);
	if (dir == IIO_EV_DIR_RISING)
		chip->high_thres = val;
	else
		chip->low_thres = val;

error_ret:
	mutex_unlock(&chip->lock);

	return ret;
}

static irqreturn_t tsl2563_event_handler(int irq, void *private)
{
	struct iio_dev *dev_info = private;
	struct tsl2563_chip *chip = iio_priv(dev_info);

	iio_push_event(dev_info,
		       IIO_UNMOD_EVENT_CODE(IIO_INTENSITY,
					    0,
					    IIO_EV_TYPE_THRESH,
					    IIO_EV_DIR_EITHER),
		       iio_get_time_ns(dev_info));

	/* clear the interrupt and push the event */
	i2c_smbus_write_byte(chip->client, TSL2563_CMD | TSL2563_CLEARINT);
	return IRQ_HANDLED;
}

static int tsl2563_write_interrupt_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 tsl2563_chip *chip = iio_priv(indio_dev);
	int ret = 0;

	mutex_lock(&chip->lock);
	if (state && !(chip->intr & 0x30)) {
		chip->intr &= ~0x30;
		chip->intr |= 0x10;
		/* ensure the chip is actually on */
		cancel_delayed_work_sync(&chip->poweroff_work);
		if (!tsl2563_get_power(chip)) {
			ret = tsl2563_set_power(chip, 1);
			if (ret)
				goto out;
			ret = tsl2563_configure(chip);
			if (ret)
				goto out;
		}
		ret = i2c_smbus_write_byte_data(chip->client,
						TSL2563_CMD | TSL2563_REG_INT,
						chip->intr);
		chip->int_enabled = true;
	}

	if (!state && (chip->intr & 0x30)) {
		chip->intr &= ~0x30;
		ret = i2c_smbus_write_byte_data(chip->client,
						TSL2563_CMD | TSL2563_REG_INT,
						chip->intr);
		chip->int_enabled = false;
		/* now the interrupt is not enabled, we can go to sleep */
		schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
	}
out:
	mutex_unlock(&chip->lock);

	return ret;
}

static int tsl2563_read_interrupt_config(struct iio_dev *indio_dev,
	const struct iio_chan_spec *chan, enum iio_event_type type,
	enum iio_event_direction dir)
{
	struct tsl2563_chip *chip = iio_priv(indio_dev);
	int ret;

	mutex_lock(&chip->lock);
	ret = i2c_smbus_read_byte_data(chip->client,
				       TSL2563_CMD | TSL2563_REG_INT);
	mutex_unlock(&chip->lock);
	if (ret < 0)
		return ret;

	return !!(ret & 0x30);
}

static const struct iio_info tsl2563_info_no_irq = {
	.read_raw = &tsl2563_read_raw,
	.write_raw = &tsl2563_write_raw,
};

static const struct iio_info tsl2563_info = {
	.read_raw = &tsl2563_read_raw,
	.write_raw = &tsl2563_write_raw,
	.read_event_value = &tsl2563_read_thresh,
	.write_event_value = &tsl2563_write_thresh,
	.read_event_config = &tsl2563_read_interrupt_config,
	.write_event_config = &tsl2563_write_interrupt_config,
};

static int tsl2563_probe(struct i2c_client *client,
				const struct i2c_device_id *device_id)
{
	struct iio_dev *indio_dev;
	struct tsl2563_chip *chip;
	struct tsl2563_platform_data *pdata = client->dev.platform_data;
	int err = 0;
	u8 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);
	chip->client = client;

	err = tsl2563_detect(chip);
	if (err) {
		dev_err(&client->dev, "detect error %d\n", -err);
		return err;
	}

	err = tsl2563_read_id(chip, &id);
	if (err) {
		dev_err(&client->dev, "read id error %d\n", -err);
		return err;
	}

	mutex_init(&chip->lock);

	/* Default values used until userspace says otherwise */
	chip->low_thres = 0x0;
	chip->high_thres = 0xffff;
	chip->gainlevel = tsl2563_gainlevel_table;
	chip->intr = TSL2563_INT_PERSIST(4);
	chip->calib0 = tsl2563_calib_from_sysfs(CALIB_BASE_SYSFS);
	chip->calib1 = tsl2563_calib_from_sysfs(CALIB_BASE_SYSFS);

	if (pdata) {
		chip->cover_comp_gain = pdata->cover_comp_gain;
	} else {
		err = device_property_read_u32(&client->dev, "amstaos,cover-comp-gain",
					       &chip->cover_comp_gain);
		if (err)
			chip->cover_comp_gain = 1;
	}

	dev_info(&client->dev, "model %d, rev. %d\n", id >> 4, id & 0x0f);
	indio_dev->name = client->name;
	indio_dev->channels = tsl2563_channels;
	indio_dev->num_channels = ARRAY_SIZE(tsl2563_channels);
	indio_dev->modes = INDIO_DIRECT_MODE;

	if (client->irq)
		indio_dev->info = &tsl2563_info;
	else
		indio_dev->info = &tsl2563_info_no_irq;

	if (client->irq) {
		err = devm_request_threaded_irq(&client->dev, client->irq,
					   NULL,
					   &tsl2563_event_handler,
					   IRQF_TRIGGER_RISING | IRQF_ONESHOT,
					   "tsl2563_event",
					   indio_dev);
		if (err) {
			dev_err(&client->dev, "irq request error %d\n", -err);
			return err;
		}
	}

	err = tsl2563_configure(chip);
	if (err) {
		dev_err(&client->dev, "configure error %d\n", -err);
		return err;
	}

	INIT_DELAYED_WORK(&chip->poweroff_work, tsl2563_poweroff_work);

	/* The interrupt cannot yet be enabled so this is fine without lock */
	schedule_delayed_work(&chip->poweroff_work, 5 * HZ);

	err = iio_device_register(indio_dev);
	if (err) {
		dev_err(&client->dev, "iio registration error %d\n", -err);
		goto fail;
	}

	return 0;

fail:
	cancel_delayed_work_sync(&chip->poweroff_work);
	return err;
}

static void tsl2563_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	struct tsl2563_chip *chip = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);
	if (!chip->int_enabled)
		cancel_delayed_work_sync(&chip->poweroff_work);
	/* Ensure that interrupts are disabled - then flush any bottom halves */
	chip->intr &= ~0x30;
	i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | TSL2563_REG_INT,
				  chip->intr);
	tsl2563_set_power(chip, 0);
}

static int tsl2563_suspend(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	struct tsl2563_chip *chip = iio_priv(indio_dev);
	int ret;

	mutex_lock(&chip->lock);

	ret = tsl2563_set_power(chip, 0);
	if (ret)
		goto out;

	chip->suspended = true;

out:
	mutex_unlock(&chip->lock);
	return ret;
}

static int tsl2563_resume(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	struct tsl2563_chip *chip = iio_priv(indio_dev);
	int ret;

	mutex_lock(&chip->lock);

	ret = tsl2563_set_power(chip, 1);
	if (ret)
		goto out;

	ret = tsl2563_configure(chip);
	if (ret)
		goto out;

	chip->suspended = false;

out:
	mutex_unlock(&chip->lock);
	return ret;
}

static DEFINE_SIMPLE_DEV_PM_OPS(tsl2563_pm_ops, tsl2563_suspend,
				tsl2563_resume);

static const struct i2c_device_id tsl2563_id[] = {
	{ "tsl2560", 0 },
	{ "tsl2561", 1 },
	{ "tsl2562", 2 },
	{ "tsl2563", 3 },
	{}
};
MODULE_DEVICE_TABLE(i2c, tsl2563_id);

static const struct of_device_id tsl2563_of_match[] = {
	{ .compatible = "amstaos,tsl2560" },
	{ .compatible = "amstaos,tsl2561" },
	{ .compatible = "amstaos,tsl2562" },
	{ .compatible = "amstaos,tsl2563" },
	{}
};
MODULE_DEVICE_TABLE(of, tsl2563_of_match);

static struct i2c_driver tsl2563_i2c_driver = {
	.driver = {
		.name	 = "tsl2563",
		.of_match_table = tsl2563_of_match,
		.pm	= pm_sleep_ptr(&tsl2563_pm_ops),
	},
	.probe		= tsl2563_probe,
	.remove		= tsl2563_remove,
	.id_table	= tsl2563_id,
};
module_i2c_driver(tsl2563_i2c_driver);

MODULE_AUTHOR("Nokia Corporation");
MODULE_DESCRIPTION("tsl2563 light sensor driver");
MODULE_LICENSE("GPL");