summaryrefslogtreecommitdiffstats
path: root/drivers/iio/light/stk3310.c
blob: 6e2a169da950864609e3f926f6afa1a3047e5a3d (plain) (blame)
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
/**
 * Sensortek STK3310/STK3311 Ambient Light and Proximity Sensor
 *
 * Copyright (c) 2015, Intel Corporation.
 *
 * This file is subject to the terms and conditions of version 2 of
 * the GNU General Public License. See the file COPYING in the main
 * directory of this archive for more details.
 *
 * IIO driver for STK3310/STK3311. 7-bit I2C address: 0x48.
 */

#include <linux/acpi.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/iio/events.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>

#define STK3310_REG_STATE			0x00
#define STK3310_REG_PSCTRL			0x01
#define STK3310_REG_ALSCTRL			0x02
#define STK3310_REG_INT				0x04
#define STK3310_REG_THDH_PS			0x06
#define STK3310_REG_THDL_PS			0x08
#define STK3310_REG_FLAG			0x10
#define STK3310_REG_PS_DATA_MSB			0x11
#define STK3310_REG_PS_DATA_LSB			0x12
#define STK3310_REG_ALS_DATA_MSB		0x13
#define STK3310_REG_ALS_DATA_LSB		0x14
#define STK3310_REG_ID				0x3E
#define STK3310_MAX_REG				0x80

#define STK3310_STATE_EN_PS			BIT(0)
#define STK3310_STATE_EN_ALS			BIT(1)
#define STK3310_STATE_STANDBY			0x00

#define STK3310_CHIP_ID_VAL			0x13
#define STK3311_CHIP_ID_VAL			0x1D
#define STK3310_PSINT_EN			0x01
#define STK3310_PS_MAX_VAL			0xFFFF

#define STK3310_DRIVER_NAME			"stk3310"
#define STK3310_REGMAP_NAME			"stk3310_regmap"
#define STK3310_EVENT				"stk3310_event"

#define STK3310_SCALE_AVAILABLE			"6.4 1.6 0.4 0.1"

#define STK3310_IT_AVAILABLE \
	"0.000185 0.000370 0.000741 0.001480 0.002960 0.005920 0.011840 " \
	"0.023680 0.047360 0.094720 0.189440 0.378880 0.757760 1.515520 " \
	"3.031040 6.062080"

#define STK3310_REGFIELD(name)						    \
	do {								    \
		data->reg_##name =					    \
			devm_regmap_field_alloc(&client->dev, regmap,	    \
				stk3310_reg_field_##name);		    \
		if (IS_ERR(data->reg_##name)) {				    \
			dev_err(&client->dev, "reg field alloc failed.\n"); \
			return PTR_ERR(data->reg_##name);		    \
		}							    \
	} while (0)

static const struct reg_field stk3310_reg_field_state =
				REG_FIELD(STK3310_REG_STATE, 0, 2);
static const struct reg_field stk3310_reg_field_als_gain =
				REG_FIELD(STK3310_REG_ALSCTRL, 4, 5);
static const struct reg_field stk3310_reg_field_ps_gain =
				REG_FIELD(STK3310_REG_PSCTRL, 4, 5);
static const struct reg_field stk3310_reg_field_als_it =
				REG_FIELD(STK3310_REG_ALSCTRL, 0, 3);
static const struct reg_field stk3310_reg_field_ps_it =
				REG_FIELD(STK3310_REG_PSCTRL, 0, 3);
static const struct reg_field stk3310_reg_field_int_ps =
				REG_FIELD(STK3310_REG_INT, 0, 2);
static const struct reg_field stk3310_reg_field_flag_psint =
				REG_FIELD(STK3310_REG_FLAG, 4, 4);
static const struct reg_field stk3310_reg_field_flag_nf =
				REG_FIELD(STK3310_REG_FLAG, 0, 0);

/* Estimate maximum proximity values with regard to measurement scale. */
static const int stk3310_ps_max[4] = {
	STK3310_PS_MAX_VAL / 640,
	STK3310_PS_MAX_VAL / 160,
	STK3310_PS_MAX_VAL /  40,
	STK3310_PS_MAX_VAL /  10
};

static const int stk3310_scale_table[][2] = {
	{6, 400000}, {1, 600000}, {0, 400000}, {0, 100000}
};

/* Integration time in seconds, microseconds */
static const int stk3310_it_table[][2] = {
	{0, 185},	{0, 370},	{0, 741},	{0, 1480},
	{0, 2960},	{0, 5920},	{0, 11840},	{0, 23680},
	{0, 47360},	{0, 94720},	{0, 189440},	{0, 378880},
	{0, 757760},	{1, 515520},	{3, 31040},	{6, 62080},
};

struct stk3310_data {
	struct i2c_client *client;
	struct mutex lock;
	bool als_enabled;
	bool ps_enabled;
	u64 timestamp;
	struct regmap *regmap;
	struct regmap_field *reg_state;
	struct regmap_field *reg_als_gain;
	struct regmap_field *reg_ps_gain;
	struct regmap_field *reg_als_it;
	struct regmap_field *reg_ps_it;
	struct regmap_field *reg_int_ps;
	struct regmap_field *reg_flag_psint;
	struct regmap_field *reg_flag_nf;
};

static const struct iio_event_spec stk3310_events[] = {
	/* Proximity event */
	{
		.type = IIO_EV_TYPE_THRESH,
		.dir = IIO_EV_DIR_RISING,
		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
				 BIT(IIO_EV_INFO_ENABLE),
	},
	/* Out-of-proximity event */
	{
		.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 stk3310_channels[] = {
	{
		.type = IIO_LIGHT,
		.info_mask_separate =
			BIT(IIO_CHAN_INFO_RAW) |
			BIT(IIO_CHAN_INFO_SCALE) |
			BIT(IIO_CHAN_INFO_INT_TIME),
	},
	{
		.type = IIO_PROXIMITY,
		.info_mask_separate =
			BIT(IIO_CHAN_INFO_RAW) |
			BIT(IIO_CHAN_INFO_SCALE) |
			BIT(IIO_CHAN_INFO_INT_TIME),
		.event_spec = stk3310_events,
		.num_event_specs = ARRAY_SIZE(stk3310_events),
	}
};

static IIO_CONST_ATTR(in_illuminance_scale_available, STK3310_SCALE_AVAILABLE);

static IIO_CONST_ATTR(in_proximity_scale_available, STK3310_SCALE_AVAILABLE);

static IIO_CONST_ATTR(in_illuminance_integration_time_available,
		      STK3310_IT_AVAILABLE);

static IIO_CONST_ATTR(in_proximity_integration_time_available,
		      STK3310_IT_AVAILABLE);

static struct attribute *stk3310_attributes[] = {
	&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
	&iio_const_attr_in_proximity_scale_available.dev_attr.attr,
	&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 stk3310_attribute_group = {
	.attrs = stk3310_attributes
};

static int stk3310_get_index(const int table[][2], int table_size,
			     int val, int val2)
{
	int i;

	for (i = 0; i < table_size; i++) {
		if (val == table[i][0] && val2 == table[i][1])
			return i;
	}

	return -EINVAL;
}

static int stk3310_read_event(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)
{
	u8 reg;
	__be16 buf;
	int ret;
	struct stk3310_data *data = iio_priv(indio_dev);

	if (info != IIO_EV_INFO_VALUE)
		return -EINVAL;

	/* Only proximity interrupts are implemented at the moment. */
	if (dir == IIO_EV_DIR_RISING)
		reg = STK3310_REG_THDH_PS;
	else if (dir == IIO_EV_DIR_FALLING)
		reg = STK3310_REG_THDL_PS;
	else
		return -EINVAL;

	mutex_lock(&data->lock);
	ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
	mutex_unlock(&data->lock);
	if (ret < 0) {
		dev_err(&data->client->dev, "register read failed\n");
		return ret;
	}
	*val = be16_to_cpu(buf);

	return IIO_VAL_INT;
}

static int stk3310_write_event(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)
{
	u8 reg;
	__be16 buf;
	int ret;
	unsigned int index;
	struct stk3310_data *data = iio_priv(indio_dev);
	struct i2c_client *client = data->client;

	ret = regmap_field_read(data->reg_ps_gain, &index);
	if (ret < 0)
		return ret;

	if (val < 0 || val > stk3310_ps_max[index])
		return -EINVAL;

	if (dir == IIO_EV_DIR_RISING)
		reg = STK3310_REG_THDH_PS;
	else if (dir == IIO_EV_DIR_FALLING)
		reg = STK3310_REG_THDL_PS;
	else
		return -EINVAL;

	buf = cpu_to_be16(val);
	ret = regmap_bulk_write(data->regmap, reg, &buf, 2);
	if (ret < 0)
		dev_err(&client->dev, "failed to set PS threshold!\n");

	return ret;
}

static int stk3310_read_event_config(struct iio_dev *indio_dev,
				     const struct iio_chan_spec *chan,
				     enum iio_event_type type,
				     enum iio_event_direction dir)
{
	unsigned int event_val;
	int ret;
	struct stk3310_data *data = iio_priv(indio_dev);

	ret = regmap_field_read(data->reg_int_ps, &event_val);
	if (ret < 0)
		return ret;

	return event_val;
}

static int stk3310_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)
{
	int ret;
	struct stk3310_data *data = iio_priv(indio_dev);
	struct i2c_client *client = data->client;

	if (state < 0 || state > 7)
		return -EINVAL;

	/* Set INT_PS value */
	mutex_lock(&data->lock);
	ret = regmap_field_write(data->reg_int_ps, state);
	if (ret < 0)
		dev_err(&client->dev, "failed to set interrupt mode\n");
	mutex_unlock(&data->lock);

	return ret;
}

static int stk3310_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan,
			    int *val, int *val2, long mask)
{
	u8 reg;
	__be16 buf;
	int ret;
	unsigned int index;
	struct stk3310_data *data = iio_priv(indio_dev);
	struct i2c_client *client = data->client;

	if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
		return -EINVAL;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		if (chan->type == IIO_LIGHT)
			reg = STK3310_REG_ALS_DATA_MSB;
		else
			reg = STK3310_REG_PS_DATA_MSB;

		mutex_lock(&data->lock);
		ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
		if (ret < 0) {
			dev_err(&client->dev, "register read failed\n");
			mutex_unlock(&data->lock);
			return ret;
		}
		*val = be16_to_cpu(buf);
		mutex_unlock(&data->lock);
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_INT_TIME:
		if (chan->type == IIO_LIGHT)
			ret = regmap_field_read(data->reg_als_it, &index);
		else
			ret = regmap_field_read(data->reg_ps_it, &index);
		if (ret < 0)
			return ret;

		*val = stk3310_it_table[index][0];
		*val2 = stk3310_it_table[index][1];
		return IIO_VAL_INT_PLUS_MICRO;
	case IIO_CHAN_INFO_SCALE:
		if (chan->type == IIO_LIGHT)
			ret = regmap_field_read(data->reg_als_gain, &index);
		else
			ret = regmap_field_read(data->reg_ps_gain, &index);
		if (ret < 0)
			return ret;

		*val = stk3310_scale_table[index][0];
		*val2 = stk3310_scale_table[index][1];
		return IIO_VAL_INT_PLUS_MICRO;
	}

	return -EINVAL;
}

static int stk3310_write_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int val, int val2, long mask)
{
	int ret;
	int index;
	struct stk3310_data *data = iio_priv(indio_dev);

	if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
		return -EINVAL;

	switch (mask) {
	case IIO_CHAN_INFO_INT_TIME:
		index = stk3310_get_index(stk3310_it_table,
					  ARRAY_SIZE(stk3310_it_table),
					  val, val2);
		if (index < 0)
			return -EINVAL;
		mutex_lock(&data->lock);
		if (chan->type == IIO_LIGHT)
			ret = regmap_field_write(data->reg_als_it, index);
		else
			ret = regmap_field_write(data->reg_ps_it, index);
		if (ret < 0)
			dev_err(&data->client->dev,
				"sensor configuration failed\n");
		mutex_unlock(&data->lock);
		return ret;

	case IIO_CHAN_INFO_SCALE:
		index = stk3310_get_index(stk3310_scale_table,
					  ARRAY_SIZE(stk3310_scale_table),
					  val, val2);
		if (index < 0)
			return -EINVAL;
		mutex_lock(&data->lock);
		if (chan->type == IIO_LIGHT)
			ret = regmap_field_write(data->reg_als_gain, index);
		else
			ret = regmap_field_write(data->reg_ps_gain, index);
		if (ret < 0)
			dev_err(&data->client->dev,
				"sensor configuration failed\n");
		mutex_unlock(&data->lock);
		return ret;
	}

	return -EINVAL;
}

static const struct iio_info stk3310_info = {
	.read_raw		= stk3310_read_raw,
	.write_raw		= stk3310_write_raw,
	.attrs			= &stk3310_attribute_group,
	.read_event_value	= stk3310_read_event,
	.write_event_value	= stk3310_write_event,
	.read_event_config	= stk3310_read_event_config,
	.write_event_config	= stk3310_write_event_config,
};

static int stk3310_set_state(struct stk3310_data *data, u8 state)
{
	int ret;
	struct i2c_client *client = data->client;

	/* 3-bit state; 0b100 is not supported. */
	if (state > 7 || state == 4)
		return -EINVAL;

	mutex_lock(&data->lock);
	ret = regmap_field_write(data->reg_state, state);
	if (ret < 0) {
		dev_err(&client->dev, "failed to change sensor state\n");
	} else if (state != STK3310_STATE_STANDBY) {
		/* Don't reset the 'enabled' flags if we're going in standby */
		data->ps_enabled  = !!(state & STK3310_STATE_EN_PS);
		data->als_enabled = !!(state & STK3310_STATE_EN_ALS);
	}
	mutex_unlock(&data->lock);

	return ret;
}

static int stk3310_init(struct iio_dev *indio_dev)
{
	int ret;
	int chipid;
	u8 state;
	struct stk3310_data *data = iio_priv(indio_dev);
	struct i2c_client *client = data->client;

	ret = regmap_read(data->regmap, STK3310_REG_ID, &chipid);
	if (ret < 0)
		return ret;

	if (chipid != STK3310_CHIP_ID_VAL &&
	    chipid != STK3311_CHIP_ID_VAL) {
		dev_err(&client->dev, "invalid chip id: 0x%x\n", chipid);
		return -ENODEV;
	}

	state = STK3310_STATE_EN_ALS | STK3310_STATE_EN_PS;
	ret = stk3310_set_state(data, state);
	if (ret < 0) {
		dev_err(&client->dev, "failed to enable sensor");
		return ret;
	}

	/* Enable PS interrupts */
	ret = regmap_field_write(data->reg_int_ps, STK3310_PSINT_EN);
	if (ret < 0)
		dev_err(&client->dev, "failed to enable interrupts!\n");

	return ret;
}

static bool stk3310_is_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case STK3310_REG_ALS_DATA_MSB:
	case STK3310_REG_ALS_DATA_LSB:
	case STK3310_REG_PS_DATA_LSB:
	case STK3310_REG_PS_DATA_MSB:
	case STK3310_REG_FLAG:
		return true;
	default:
		return false;
	}
}

static struct regmap_config stk3310_regmap_config = {
	.name = STK3310_REGMAP_NAME,
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = STK3310_MAX_REG,
	.cache_type = REGCACHE_RBTREE,
	.volatile_reg = stk3310_is_volatile_reg,
};

static int stk3310_regmap_init(struct stk3310_data *data)
{
	struct regmap *regmap;
	struct i2c_client *client;

	client = data->client;
	regmap = devm_regmap_init_i2c(client, &stk3310_regmap_config);
	if (IS_ERR(regmap)) {
		dev_err(&client->dev, "regmap initialization failed.\n");
		return PTR_ERR(regmap);
	}
	data->regmap = regmap;

	STK3310_REGFIELD(state);
	STK3310_REGFIELD(als_gain);
	STK3310_REGFIELD(ps_gain);
	STK3310_REGFIELD(als_it);
	STK3310_REGFIELD(ps_it);
	STK3310_REGFIELD(int_ps);
	STK3310_REGFIELD(flag_psint);
	STK3310_REGFIELD(flag_nf);

	return 0;
}

static irqreturn_t stk3310_irq_handler(int irq, void *private)
{
	struct iio_dev *indio_dev = private;
	struct stk3310_data *data = iio_priv(indio_dev);

	data->timestamp = iio_get_time_ns(indio_dev);

	return IRQ_WAKE_THREAD;
}

static irqreturn_t stk3310_irq_event_handler(int irq, void *private)
{
	int ret;
	unsigned int dir;
	u64 event;

	struct iio_dev *indio_dev = private;
	struct stk3310_data *data = iio_priv(indio_dev);

	/* Read FLAG_NF to figure out what threshold has been met. */
	mutex_lock(&data->lock);
	ret = regmap_field_read(data->reg_flag_nf, &dir);
	if (ret < 0) {
		dev_err(&data->client->dev, "register read failed\n");
		mutex_unlock(&data->lock);
		return ret;
	}
	event = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1,
				     IIO_EV_TYPE_THRESH,
				     (dir ? IIO_EV_DIR_FALLING :
					    IIO_EV_DIR_RISING));
	iio_push_event(indio_dev, event, data->timestamp);

	/* Reset the interrupt flag */
	ret = regmap_field_write(data->reg_flag_psint, 0);
	if (ret < 0)
		dev_err(&data->client->dev, "failed to reset interrupts\n");
	mutex_unlock(&data->lock);

	return IRQ_HANDLED;
}

static int stk3310_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	int ret;
	struct iio_dev *indio_dev;
	struct stk3310_data *data;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	if (!indio_dev) {
		dev_err(&client->dev, "iio allocation failed!\n");
		return -ENOMEM;
	}

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

	ret = stk3310_regmap_init(data);
	if (ret < 0)
		return ret;

	indio_dev->dev.parent = &client->dev;
	indio_dev->info = &stk3310_info;
	indio_dev->name = STK3310_DRIVER_NAME;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = stk3310_channels;
	indio_dev->num_channels = ARRAY_SIZE(stk3310_channels);

	ret = stk3310_init(indio_dev);
	if (ret < 0)
		return ret;

	if (client->irq > 0) {
		ret = devm_request_threaded_irq(&client->dev, client->irq,
						stk3310_irq_handler,
						stk3310_irq_event_handler,
						IRQF_TRIGGER_FALLING |
						IRQF_ONESHOT,
						STK3310_EVENT, indio_dev);
		if (ret < 0) {
			dev_err(&client->dev, "request irq %d failed\n",
				client->irq);
			goto err_standby;
		}
	}

	ret = iio_device_register(indio_dev);
	if (ret < 0) {
		dev_err(&client->dev, "device_register failed\n");
		goto err_standby;
	}

	return 0;

err_standby:
	stk3310_set_state(data, STK3310_STATE_STANDBY);
	return ret;
}

static int stk3310_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);

	iio_device_unregister(indio_dev);
	return stk3310_set_state(iio_priv(indio_dev), STK3310_STATE_STANDBY);
}

#ifdef CONFIG_PM_SLEEP
static int stk3310_suspend(struct device *dev)
{
	struct stk3310_data *data;

	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));

	return stk3310_set_state(data, STK3310_STATE_STANDBY);
}

static int stk3310_resume(struct device *dev)
{
	u8 state = 0;
	struct stk3310_data *data;

	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
	if (data->ps_enabled)
		state |= STK3310_STATE_EN_PS;
	if (data->als_enabled)
		state |= STK3310_STATE_EN_ALS;

	return stk3310_set_state(data, state);
}

static SIMPLE_DEV_PM_OPS(stk3310_pm_ops, stk3310_suspend, stk3310_resume);

#define STK3310_PM_OPS (&stk3310_pm_ops)
#else
#define STK3310_PM_OPS NULL
#endif

static const struct i2c_device_id stk3310_i2c_id[] = {
	{"STK3310", 0},
	{"STK3311", 0},
	{}
};
MODULE_DEVICE_TABLE(i2c, stk3310_i2c_id);

static const struct acpi_device_id stk3310_acpi_id[] = {
	{"STK3310", 0},
	{"STK3311", 0},
	{}
};

MODULE_DEVICE_TABLE(acpi, stk3310_acpi_id);

static struct i2c_driver stk3310_driver = {
	.driver = {
		.name = "stk3310",
		.pm = STK3310_PM_OPS,
		.acpi_match_table = ACPI_PTR(stk3310_acpi_id),
	},
	.probe =            stk3310_probe,
	.remove =           stk3310_remove,
	.id_table =         stk3310_i2c_id,
};

module_i2c_driver(stk3310_driver);

MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
MODULE_DESCRIPTION("STK3310 Ambient Light and Proximity Sensor driver");
MODULE_LICENSE("GPL v2");