summaryrefslogblamecommitdiffstats
path: root/drivers/misc/bh1770glc.c
blob: 845466e45b9593ece7702c574fb5a42fc6032bd4 (plain) (tree)
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










































































































































































































































































































































































































































































































































































































































































                                                                               
                    
 


                                       





                                                                  



                                            
 
                                                                        




























































                                                                            
                
 


                                       






























































































                                                                              
                
 


                                       












                                                                      
                
 


                                       





















                                                                            



                                       

























                                                                          
                
 


                                       





















                                                                          
                
 


                                       









































                                                                            
                
 


                                       













































                                                                            


                                         
































                                                                            
                             
                
 


                                        













































































































                                                                                
                                                  




                                                               
                                                                    











                                                                      
                               























                                                                 

                                                                          

                                                                 
                           





                                                                    
                           




                                                                     
                           









                                                                      
                           





                                                     
                                   






                                                                           
                           














                                                                     
                           


                                                                   
      

                                                   
      

                                                 
      
                                                                   


                   
                                                   


















                                                              


                 
                      

                                             
                                                       








                                                              
                                                       





















                                                                            

      
                

                                                     
                                                       








                                                              
                                                       























                                                                               


                                         
                                  


                              
                                 



                                                                            
/*
 * This file is part of the ROHM BH1770GLC / OSRAM SFH7770 sensor driver.
 * Chip is combined proximity and ambient light sensor.
 *
 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 *
 * Contact: Samu Onkalo <samu.p.onkalo@nokia.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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/mutex.h>
#include <linux/i2c/bh1770glc.h>
#include <linux/regulator/consumer.h>
#include <linux/pm_runtime.h>
#include <linux/workqueue.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include <linux/slab.h>

#define BH1770_ALS_CONTROL	0x80 /* ALS operation mode control */
#define BH1770_PS_CONTROL	0x81 /* PS operation mode control */
#define BH1770_I_LED		0x82 /* active LED and LED1, LED2 current */
#define BH1770_I_LED3		0x83 /* LED3 current setting */
#define BH1770_ALS_PS_MEAS	0x84 /* Forced mode trigger */
#define BH1770_PS_MEAS_RATE	0x85 /* PS meas. rate at stand alone mode */
#define BH1770_ALS_MEAS_RATE	0x86 /* ALS meas. rate at stand alone mode */
#define BH1770_PART_ID		0x8a /* Part number and revision ID */
#define BH1770_MANUFACT_ID	0x8b /* Manufacturerer ID */
#define BH1770_ALS_DATA_0	0x8c /* ALS DATA low byte */
#define BH1770_ALS_DATA_1	0x8d /* ALS DATA high byte */
#define BH1770_ALS_PS_STATUS	0x8e /* Measurement data and int status */
#define BH1770_PS_DATA_LED1	0x8f /* PS data from LED1 */
#define BH1770_PS_DATA_LED2	0x90 /* PS data from LED2 */
#define BH1770_PS_DATA_LED3	0x91 /* PS data from LED3 */
#define BH1770_INTERRUPT	0x92 /* Interrupt setting */
#define BH1770_PS_TH_LED1	0x93 /* PS interrupt threshold for LED1 */
#define BH1770_PS_TH_LED2	0x94 /* PS interrupt threshold for LED2 */
#define BH1770_PS_TH_LED3	0x95 /* PS interrupt threshold for LED3 */
#define BH1770_ALS_TH_UP_0	0x96 /* ALS upper threshold low byte */
#define BH1770_ALS_TH_UP_1	0x97 /* ALS upper threshold high byte */
#define BH1770_ALS_TH_LOW_0	0x98 /* ALS lower threshold low byte */
#define BH1770_ALS_TH_LOW_1	0x99 /* ALS lower threshold high byte */

/* MANUFACT_ID */
#define BH1770_MANUFACT_ROHM	0x01
#define BH1770_MANUFACT_OSRAM	0x03

/* PART_ID */
#define BH1770_PART		0x90
#define BH1770_PART_MASK	0xf0
#define BH1770_REV_MASK		0x0f
#define BH1770_REV_SHIFT	0
#define BH1770_REV_0		0x00
#define BH1770_REV_1		0x01

/* Operating modes for both */
#define BH1770_STANDBY		0x00
#define BH1770_FORCED		0x02
#define BH1770_STANDALONE	0x03
#define BH1770_SWRESET		(0x01 << 2)

#define BH1770_PS_TRIG_MEAS	(1 << 0)
#define BH1770_ALS_TRIG_MEAS	(1 << 1)

/* Interrupt control */
#define BH1770_INT_OUTPUT_MODE	(1 << 3) /* 0 = latched */
#define BH1770_INT_POLARITY	(1 << 2) /* 1 = active high */
#define BH1770_INT_ALS_ENA	(1 << 1)
#define BH1770_INT_PS_ENA	(1 << 0)

/* Interrupt status */
#define BH1770_INT_LED1_DATA	(1 << 0)
#define BH1770_INT_LED1_INT	(1 << 1)
#define BH1770_INT_LED2_DATA	(1 << 2)
#define BH1770_INT_LED2_INT	(1 << 3)
#define BH1770_INT_LED3_DATA	(1 << 4)
#define BH1770_INT_LED3_INT	(1 << 5)
#define BH1770_INT_LEDS_INT	((1 << 1) | (1 << 3) | (1 << 5))
#define BH1770_INT_ALS_DATA	(1 << 6)
#define BH1770_INT_ALS_INT	(1 << 7)

/* Led channels */
#define BH1770_LED1		0x00

#define BH1770_DISABLE		0
#define BH1770_ENABLE		1
#define BH1770_PROX_CHANNELS	1

#define BH1770_LUX_DEFAULT_RATE	1 /* Index to lux rate table */
#define BH1770_PROX_DEFAULT_RATE 1 /* Direct HW value =~ 50Hz */
#define BH1770_PROX_DEF_RATE_THRESH 6 /* Direct HW value =~ 5 Hz */
#define BH1770_STARTUP_DELAY	50
#define BH1770_RESET_TIME	10
#define BH1770_TIMEOUT		2100 /* Timeout in 2.1 seconds */

#define BH1770_LUX_RANGE	65535
#define BH1770_PROX_RANGE	255
#define BH1770_COEF_SCALER	1024
#define BH1770_CALIB_SCALER	8192
#define BH1770_LUX_NEUTRAL_CALIB_VALUE (1 * BH1770_CALIB_SCALER)
#define BH1770_LUX_DEF_THRES	1000
#define BH1770_PROX_DEF_THRES	70
#define BH1770_PROX_DEF_ABS_THRES   100
#define BH1770_DEFAULT_PERSISTENCE  10
#define BH1770_PROX_MAX_PERSISTENCE 50
#define BH1770_LUX_GA_SCALE	16384
#define BH1770_LUX_CF_SCALE	2048 /* CF ChipFactor */
#define BH1770_NEUTRAL_CF	BH1770_LUX_CF_SCALE
#define BH1770_LUX_CORR_SCALE	4096

#define PROX_ABOVE_THRESHOLD	1
#define PROX_BELOW_THRESHOLD	0

#define PROX_IGNORE_LUX_LIMIT	500

struct bh1770_chip {
	struct bh1770_platform_data	*pdata;
	char				chipname[10];
	u8				revision;
	struct i2c_client		*client;
	struct regulator_bulk_data	regs[2];
	struct mutex			mutex; /* avoid parallel access */
	wait_queue_head_t		wait;

	bool			int_mode_prox;
	bool			int_mode_lux;
	struct delayed_work	prox_work;
	u32	lux_cf; /* Chip specific factor */
	u32	lux_ga;
	u32	lux_calib;
	int	lux_rate_index;
	u32	lux_corr;
	u16	lux_data_raw;
	u16	lux_threshold_hi;
	u16	lux_threshold_lo;
	u16	lux_thres_hi_onchip;
	u16	lux_thres_lo_onchip;
	bool	lux_wait_result;

	int	prox_enable_count;
	u16	prox_coef;
	u16	prox_const;
	int	prox_rate;
	int	prox_rate_threshold;
	u8	prox_persistence;
	u8	prox_persistence_counter;
	u8	prox_data;
	u8	prox_threshold;
	u8	prox_threshold_hw;
	bool	prox_force_update;
	u8	prox_abs_thres;
	u8	prox_led;
};

static const char reg_vcc[] = "Vcc";
static const char reg_vleds[] = "Vleds";

/*
 * Supported stand alone rates in ms from chip data sheet
 * {10, 20, 30, 40, 70, 100, 200, 500, 1000, 2000};
 */
static const s16 prox_rates_hz[] = {100, 50, 33, 25, 14, 10, 5, 2};
static const s16 prox_rates_ms[] = {10, 20, 30, 40, 70, 100, 200, 500};

/* Supported IR-led currents in mA */
static const u8 prox_curr_ma[] = {5, 10, 20, 50, 100, 150, 200};

/*
 * Supported stand alone rates in ms from chip data sheet
 * {100, 200, 500, 1000, 2000};
 */
static const s16 lux_rates_hz[] = {10, 5, 2, 1, 0};

/*
 * interrupt control functions are called while keeping chip->mutex
 * excluding module probe / remove
 */
static inline int bh1770_lux_interrupt_control(struct bh1770_chip *chip,
					int lux)
{
	chip->int_mode_lux = lux;
	/* Set interrupt modes, interrupt active low, latched */
	return i2c_smbus_write_byte_data(chip->client,
					BH1770_INTERRUPT,
					(lux << 1) | chip->int_mode_prox);
}

static inline int bh1770_prox_interrupt_control(struct bh1770_chip *chip,
					int ps)
{
	chip->int_mode_prox = ps;
	return i2c_smbus_write_byte_data(chip->client,
					BH1770_INTERRUPT,
					(chip->int_mode_lux << 1) | (ps << 0));
}

/* chip->mutex is always kept here */
static int bh1770_lux_rate(struct bh1770_chip *chip, int rate_index)
{
	/* sysfs may call this when the chip is powered off */
	if (pm_runtime_suspended(&chip->client->dev))
		return 0;

	/* Proper proximity response needs fastest lux rate (100ms) */
	if (chip->prox_enable_count)
		rate_index = 0;

	return i2c_smbus_write_byte_data(chip->client,
					BH1770_ALS_MEAS_RATE,
					rate_index);
}

static int bh1770_prox_rate(struct bh1770_chip *chip, int mode)
{
	int rate;

	rate = (mode == PROX_ABOVE_THRESHOLD) ?
		chip->prox_rate_threshold : chip->prox_rate;

	return i2c_smbus_write_byte_data(chip->client,
					BH1770_PS_MEAS_RATE,
					rate);
}

/* InfraredLED is controlled by the chip during proximity scanning */
static inline int bh1770_led_cfg(struct bh1770_chip *chip)
{
	/* LED cfg, current for leds 1 and 2 */
	return i2c_smbus_write_byte_data(chip->client,
					BH1770_I_LED,
					(BH1770_LED1 << 6) |
					(BH1770_LED_5mA << 3) |
					chip->prox_led);
}

/*
 * Following two functions converts raw ps values from HW to normalized
 * values. Purpose is to compensate differences between different sensor
 * versions and variants so that result means about the same between
 * versions.
 */
static inline u8 bh1770_psraw_to_adjusted(struct bh1770_chip *chip, u8 psraw)
{
	u16 adjusted;
	adjusted = (u16)(((u32)(psraw + chip->prox_const) * chip->prox_coef) /
		BH1770_COEF_SCALER);
	if (adjusted > BH1770_PROX_RANGE)
		adjusted = BH1770_PROX_RANGE;
	return adjusted;
}

static inline u8 bh1770_psadjusted_to_raw(struct bh1770_chip *chip, u8 ps)
{
	u16 raw;

	raw = (((u32)ps * BH1770_COEF_SCALER) / chip->prox_coef);
	if (raw > chip->prox_const)
		raw = raw - chip->prox_const;
	else
		raw = 0;
	return raw;
}

/*
 * Following two functions converts raw lux values from HW to normalized
 * values. Purpose is to compensate differences between different sensor
 * versions and variants so that result means about the same between
 * versions. Chip->mutex is kept when this is called.
 */
static int bh1770_prox_set_threshold(struct bh1770_chip *chip)
{
	u8 tmp = 0;

	/* sysfs may call this when the chip is powered off */
	if (pm_runtime_suspended(&chip->client->dev))
		return 0;

	tmp = bh1770_psadjusted_to_raw(chip, chip->prox_threshold);
	chip->prox_threshold_hw = tmp;

	return	i2c_smbus_write_byte_data(chip->client, BH1770_PS_TH_LED1,
					tmp);
}

static inline u16 bh1770_lux_raw_to_adjusted(struct bh1770_chip *chip, u16 raw)
{
	u32 lux;
	lux = ((u32)raw * chip->lux_corr) / BH1770_LUX_CORR_SCALE;
	return min(lux, (u32)BH1770_LUX_RANGE);
}

static inline u16 bh1770_lux_adjusted_to_raw(struct bh1770_chip *chip,
					u16 adjusted)
{
	return (u32)adjusted * BH1770_LUX_CORR_SCALE / chip->lux_corr;
}

/* chip->mutex is kept when this is called */
static int bh1770_lux_update_thresholds(struct bh1770_chip *chip,
					u16 threshold_hi, u16 threshold_lo)
{
	u8 data[4];
	int ret;

	/* sysfs may call this when the chip is powered off */
	if (pm_runtime_suspended(&chip->client->dev))
		return 0;

	/*
	 * Compensate threshold values with the correction factors if not
	 * set to minimum or maximum.
	 * Min & max values disables interrupts.
	 */
	if (threshold_hi != BH1770_LUX_RANGE && threshold_hi != 0)
		threshold_hi = bh1770_lux_adjusted_to_raw(chip, threshold_hi);

	if (threshold_lo != BH1770_LUX_RANGE && threshold_lo != 0)
		threshold_lo = bh1770_lux_adjusted_to_raw(chip, threshold_lo);

	if (chip->lux_thres_hi_onchip == threshold_hi &&
	    chip->lux_thres_lo_onchip == threshold_lo)
		return 0;

	chip->lux_thres_hi_onchip = threshold_hi;
	chip->lux_thres_lo_onchip = threshold_lo;

	data[0] = threshold_hi;
	data[1] = threshold_hi >> 8;
	data[2] = threshold_lo;
	data[3] = threshold_lo >> 8;

	ret = i2c_smbus_write_i2c_block_data(chip->client,
					BH1770_ALS_TH_UP_0,
					ARRAY_SIZE(data),
					data);
	return ret;
}

static int bh1770_lux_get_result(struct bh1770_chip *chip)
{
	u16 data;
	int ret;

	ret = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_DATA_0);
	if (ret < 0)
		return ret;

	data = ret & 0xff;
	ret = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_DATA_1);
	if (ret < 0)
		return ret;

	chip->lux_data_raw = data | ((ret & 0xff) << 8);

	return 0;
}

/* Calculate correction value which contains chip and device specific parts */
static u32 bh1770_get_corr_value(struct bh1770_chip *chip)
{
	u32 tmp;
	/* Impact of glass attenuation correction */
	tmp = (BH1770_LUX_CORR_SCALE * chip->lux_ga) / BH1770_LUX_GA_SCALE;
	/* Impact of chip factor correction */
	tmp = (tmp * chip->lux_cf) / BH1770_LUX_CF_SCALE;
	/* Impact of Device specific calibration correction */
	tmp = (tmp * chip->lux_calib) / BH1770_CALIB_SCALER;
	return tmp;
}

static int bh1770_lux_read_result(struct bh1770_chip *chip)
{
	bh1770_lux_get_result(chip);
	return bh1770_lux_raw_to_adjusted(chip, chip->lux_data_raw);
}

/*
 * Chip on / off functions are called while keeping mutex except probe
 * or remove phase
 */
static int bh1770_chip_on(struct bh1770_chip *chip)
{
	int ret = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
					chip->regs);
	if (ret < 0)
		return ret;

	usleep_range(BH1770_STARTUP_DELAY, BH1770_STARTUP_DELAY * 2);

	/* Reset the chip */
	i2c_smbus_write_byte_data(chip->client, BH1770_ALS_CONTROL,
				BH1770_SWRESET);
	usleep_range(BH1770_RESET_TIME, BH1770_RESET_TIME * 2);

	/*
	 * ALS is started always since proximity needs als results
	 * for realibility estimation.
	 * Let's assume dark until the first ALS measurement is ready.
	 */
	chip->lux_data_raw = 0;
	chip->prox_data = 0;
	ret = i2c_smbus_write_byte_data(chip->client,
					BH1770_ALS_CONTROL, BH1770_STANDALONE);

	/* Assume reset defaults */
	chip->lux_thres_hi_onchip = BH1770_LUX_RANGE;
	chip->lux_thres_lo_onchip = 0;

	return ret;
}

static void bh1770_chip_off(struct bh1770_chip *chip)
{
	i2c_smbus_write_byte_data(chip->client,
					BH1770_INTERRUPT, BH1770_DISABLE);
	i2c_smbus_write_byte_data(chip->client,
				BH1770_ALS_CONTROL, BH1770_STANDBY);
	i2c_smbus_write_byte_data(chip->client,
				BH1770_PS_CONTROL, BH1770_STANDBY);
	regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
}

/* chip->mutex is kept when this is called */
static int bh1770_prox_mode_control(struct bh1770_chip *chip)
{
	if (chip->prox_enable_count) {
		chip->prox_force_update = true; /* Force immediate update */

		bh1770_lux_rate(chip, chip->lux_rate_index);
		bh1770_prox_set_threshold(chip);
		bh1770_led_cfg(chip);
		bh1770_prox_rate(chip, PROX_BELOW_THRESHOLD);
		bh1770_prox_interrupt_control(chip, BH1770_ENABLE);
		i2c_smbus_write_byte_data(chip->client,
					BH1770_PS_CONTROL, BH1770_STANDALONE);
	} else {
		chip->prox_data = 0;
		bh1770_lux_rate(chip, chip->lux_rate_index);
		bh1770_prox_interrupt_control(chip, BH1770_DISABLE);
		i2c_smbus_write_byte_data(chip->client,
					BH1770_PS_CONTROL, BH1770_STANDBY);
	}
	return 0;
}

/* chip->mutex is kept when this is called */
static int bh1770_prox_read_result(struct bh1770_chip *chip)
{
	int ret;
	bool above;
	u8 mode;

	ret = i2c_smbus_read_byte_data(chip->client, BH1770_PS_DATA_LED1);
	if (ret < 0)
		goto out;

	if (ret > chip->prox_threshold_hw)
		above = true;
	else
		above = false;

	/*
	 * when ALS levels goes above limit, proximity result may be
	 * false proximity. Thus ignore the result. With real proximity
	 * there is a shadow causing low als levels.
	 */
	if (chip->lux_data_raw > PROX_IGNORE_LUX_LIMIT)
		ret = 0;

	chip->prox_data = bh1770_psraw_to_adjusted(chip, ret);

	/* Strong proximity level or force mode requires immediate response */
	if (chip->prox_data >= chip->prox_abs_thres ||
	    chip->prox_force_update)
		chip->prox_persistence_counter = chip->prox_persistence;

	chip->prox_force_update = false;

	/* Persistence filttering to reduce false proximity events */
	if (likely(above)) {
		if (chip->prox_persistence_counter < chip->prox_persistence) {
			chip->prox_persistence_counter++;
			ret = -ENODATA;
		} else {
			mode = PROX_ABOVE_THRESHOLD;
			ret = 0;
		}
	} else {
		chip->prox_persistence_counter = 0;
		mode = PROX_BELOW_THRESHOLD;
		chip->prox_data = 0;
		ret = 0;
	}

	/* Set proximity detection rate based on above or below value */
	if (ret == 0) {
		bh1770_prox_rate(chip, mode);
		sysfs_notify(&chip->client->dev.kobj, NULL, "prox0_raw");
	}
out:
	return ret;
}

static int bh1770_detect(struct bh1770_chip *chip)
{
	struct i2c_client *client = chip->client;
	s32 ret;
	u8 manu, part;

	ret = i2c_smbus_read_byte_data(client, BH1770_MANUFACT_ID);
	if (ret < 0)
		goto error;
	manu = (u8)ret;

	ret = i2c_smbus_read_byte_data(client, BH1770_PART_ID);
	if (ret < 0)
		goto error;
	part = (u8)ret;

	chip->revision = (part & BH1770_REV_MASK) >> BH1770_REV_SHIFT;
	chip->prox_coef = BH1770_COEF_SCALER;
	chip->prox_const = 0;
	chip->lux_cf = BH1770_NEUTRAL_CF;

	if ((manu == BH1770_MANUFACT_ROHM) &&
	    ((part & BH1770_PART_MASK) == BH1770_PART)) {
		snprintf(chip->chipname, sizeof(chip->chipname), "BH1770GLC");
		return 0;
	}

	if ((manu == BH1770_MANUFACT_OSRAM) &&
	    ((part & BH1770_PART_MASK) == BH1770_PART)) {
		snprintf(chip->chipname, sizeof(chip->chipname), "SFH7770");
		/* Values selected by comparing different versions */
		chip->prox_coef = 819; /* 0.8 * BH1770_COEF_SCALER */
		chip->prox_const = 40;
		return 0;
	}

	ret = -ENODEV;
error:
	dev_dbg(&client->dev, "BH1770 or SFH7770 not found\n");

	return ret;
}

/*
 * This work is re-scheduled at every proximity interrupt.
 * If this work is running, it means that there hasn't been any
 * proximity interrupt in time. Situation is handled as no-proximity.
 * It would be nice to have low-threshold interrupt or interrupt
 * when measurement and hi-threshold are both 0. But neither of those exists.
 * This is a workaroud for missing HW feature.
 */

static void bh1770_prox_work(struct work_struct *work)
{
	struct bh1770_chip *chip =
		container_of(work, struct bh1770_chip, prox_work.work);

	mutex_lock(&chip->mutex);
	bh1770_prox_read_result(chip);
	mutex_unlock(&chip->mutex);
}

/* This is threaded irq handler */
static irqreturn_t bh1770_irq(int irq, void *data)
{
	struct bh1770_chip *chip = data;
	int status;
	int rate = 0;

	mutex_lock(&chip->mutex);
	status = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_PS_STATUS);

	/* Acknowledge interrupt by reading this register */
	i2c_smbus_read_byte_data(chip->client, BH1770_INTERRUPT);

	/*
	 * Check if there is fresh data available for als.
	 * If this is the very first data, update thresholds after that.
	 */
	if (status & BH1770_INT_ALS_DATA) {
		bh1770_lux_get_result(chip);
		if (unlikely(chip->lux_wait_result)) {
			chip->lux_wait_result = false;
			wake_up(&chip->wait);
			bh1770_lux_update_thresholds(chip,
						chip->lux_threshold_hi,
						chip->lux_threshold_lo);
		}
	}

	/* Disable interrupt logic to guarantee acknowledgement */
	i2c_smbus_write_byte_data(chip->client, BH1770_INTERRUPT,
				  (0 << 1) | (0 << 0));

	if ((status & BH1770_INT_ALS_INT))
		sysfs_notify(&chip->client->dev.kobj, NULL, "lux0_input");

	if (chip->int_mode_prox && (status & BH1770_INT_LEDS_INT)) {
		rate = prox_rates_ms[chip->prox_rate_threshold];
		bh1770_prox_read_result(chip);
	}

	/* Re-enable interrupt logic */
	i2c_smbus_write_byte_data(chip->client, BH1770_INTERRUPT,
				  (chip->int_mode_lux << 1) |
				  (chip->int_mode_prox << 0));
	mutex_unlock(&chip->mutex);

	/*
	 * Can't cancel work while keeping mutex since the work uses the
	 * same mutex.
	 */
	if (rate) {
		/*
		 * Simulate missing no-proximity interrupt 50ms after the
		 * next expected interrupt time.
		 */
		cancel_delayed_work_sync(&chip->prox_work);
		schedule_delayed_work(&chip->prox_work,
				msecs_to_jiffies(rate + 50));
	}
	return IRQ_HANDLED;
}

static ssize_t bh1770_power_state_store(struct device *dev,
				      struct device_attribute *attr,
				      const char *buf, size_t count)
{
	struct bh1770_chip *chip =  dev_get_drvdata(dev);
	unsigned long value;
	ssize_t ret;

	ret = kstrtoul(buf, 0, &value);
	if (ret)
		return ret;

	mutex_lock(&chip->mutex);
	if (value) {
		pm_runtime_get_sync(dev);

		ret = bh1770_lux_rate(chip, chip->lux_rate_index);
		if (ret < 0) {
			pm_runtime_put(dev);
			goto leave;
		}

		ret = bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
		if (ret < 0) {
			pm_runtime_put(dev);
			goto leave;
		}

		/* This causes interrupt after the next measurement cycle */
		bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
					BH1770_LUX_DEF_THRES);
		/* Inform that we are waiting for a result from ALS */
		chip->lux_wait_result = true;
		bh1770_prox_mode_control(chip);
	} else if (!pm_runtime_suspended(dev)) {
		pm_runtime_put(dev);
	}
	ret = count;
leave:
	mutex_unlock(&chip->mutex);
	return ret;
}

static ssize_t bh1770_power_state_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%d\n", !pm_runtime_suspended(dev));
}

static ssize_t bh1770_lux_result_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct bh1770_chip *chip =  dev_get_drvdata(dev);
	ssize_t ret;
	long timeout;

	if (pm_runtime_suspended(dev))
		return -EIO; /* Chip is not enabled at all */

	timeout = wait_event_interruptible_timeout(chip->wait,
					!chip->lux_wait_result,
					msecs_to_jiffies(BH1770_TIMEOUT));
	if (!timeout)
		return -EIO;

	mutex_lock(&chip->mutex);
	ret = sprintf(buf, "%d\n", bh1770_lux_read_result(chip));
	mutex_unlock(&chip->mutex);

	return ret;
}

static ssize_t bh1770_lux_range_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%d\n", BH1770_LUX_RANGE);
}

static ssize_t bh1770_prox_enable_store(struct device *dev,
				      struct device_attribute *attr,
				      const char *buf, size_t count)
{
	struct bh1770_chip *chip =  dev_get_drvdata(dev);
	unsigned long value;
	int ret;

	ret = kstrtoul(buf, 0, &value);
	if (ret)
		return ret;

	mutex_lock(&chip->mutex);
	/* Assume no proximity. Sensor will tell real state soon */
	if (!chip->prox_enable_count)
		chip->prox_data = 0;

	if (value)
		chip->prox_enable_count++;
	else if (chip->prox_enable_count > 0)
		chip->prox_enable_count--;
	else
		goto leave;

	/* Run control only when chip is powered on */
	if (!pm_runtime_suspended(dev))
		bh1770_prox_mode_control(chip);
leave:
	mutex_unlock(&chip->mutex);
	return count;
}

static ssize_t bh1770_prox_enable_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct bh1770_chip *chip =  dev_get_drvdata(dev);
	ssize_t len;

	mutex_lock(&chip->mutex);
	len = sprintf(buf, "%d\n", chip->prox_enable_count);
	mutex_unlock(&chip->mutex);
	return len;
}

static ssize_t bh1770_prox_result_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct bh1770_chip *chip =  dev_get_drvdata(dev);
	ssize_t ret;

	mutex_lock(&chip->mutex);
	if (chip->prox_enable_count && !pm_runtime_suspended(dev))
		ret = sprintf(buf, "%d\n", chip->prox_data);
	else
		ret = -EIO;
	mutex_unlock(&chip->mutex);
	return ret;
}

static ssize_t bh1770_prox_range_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%d\n", BH1770_PROX_RANGE);
}

static ssize_t bh1770_get_prox_rate_avail(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	int i;
	int pos = 0;
	for (i = 0; i < ARRAY_SIZE(prox_rates_hz); i++)
		pos += sprintf(buf + pos, "%d ", prox_rates_hz[i]);
	sprintf(buf + pos - 1, "\n");
	return pos;
}

static ssize_t bh1770_get_prox_rate_above(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct bh1770_chip *chip =  dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", prox_rates_hz[chip->prox_rate_threshold]);
}

static ssize_t bh1770_get_prox_rate_below(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct bh1770_chip *chip =  dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", prox_rates_hz[chip->prox_rate]);
}

static int bh1770_prox_rate_validate(int rate)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(prox_rates_hz) - 1; i++)
		if (rate >= prox_rates_hz[i])
			break;
	return i;
}

static ssize_t bh1770_set_prox_rate_above(struct device *dev,
					struct device_attribute *attr,
					const char *buf, size_t count)
{
	struct bh1770_chip *chip =  dev_get_drvdata(dev);
	unsigned long value;
	int ret;

	ret = kstrtoul(buf, 0, &value);
	if (ret)
		return ret;

	mutex_lock(&chip->mutex);
	chip->prox_rate_threshold = bh1770_prox_rate_validate(value);
	mutex_unlock(&chip->mutex);
	return count;
}

static ssize_t bh1770_set_prox_rate_below(struct device *dev,
					struct device_attribute *attr,
					const char *buf, size_t count)
{
	struct bh1770_chip *chip =  dev_get_drvdata(dev);
	unsigned long value;
	int ret;

	ret = kstrtoul(buf, 0, &value);
	if (ret)
		return ret;

	mutex_lock(&chip->mutex);
	chip->prox_rate = bh1770_prox_rate_validate(value);
	mutex_unlock(&chip->mutex);
	return count;
}

static ssize_t bh1770_get_prox_thres(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct bh1770_chip *chip =  dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", chip->prox_threshold);
}

static ssize_t bh1770_set_prox_thres(struct device *dev,
				      struct device_attribute *attr,
				      const char *buf, size_t count)
{
	struct bh1770_chip *chip =  dev_get_drvdata(dev);
	unsigned long value;
	int ret;

	ret = kstrtoul(buf, 0, &value);
	if (ret)
		return ret;

	if (value > BH1770_PROX_RANGE)
		return -EINVAL;

	mutex_lock(&chip->mutex);
	chip->prox_threshold = value;
	ret = bh1770_prox_set_threshold(chip);
	mutex_unlock(&chip->mutex);
	if (ret < 0)
		return ret;
	return count;
}

static ssize_t bh1770_prox_persistence_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct bh1770_chip *chip = dev_get_drvdata(dev);

	return sprintf(buf, "%u\n", chip->prox_persistence);
}

static ssize_t bh1770_prox_persistence_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t len)
{
	struct bh1770_chip *chip = dev_get_drvdata(dev);
	unsigned long value;
	int ret;

	ret = kstrtoul(buf, 0, &value);
	if (ret)
		return ret;

	if (value > BH1770_PROX_MAX_PERSISTENCE)
		return -EINVAL;

	chip->prox_persistence = value;

	return len;
}

static ssize_t bh1770_prox_abs_thres_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct bh1770_chip *chip = dev_get_drvdata(dev);
	return sprintf(buf, "%u\n", chip->prox_abs_thres);
}

static ssize_t bh1770_prox_abs_thres_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t len)
{
	struct bh1770_chip *chip = dev_get_drvdata(dev);
	unsigned long value;
	int ret;

	ret = kstrtoul(buf, 0, &value);
	if (ret)
		return ret;

	if (value > BH1770_PROX_RANGE)
		return -EINVAL;

	chip->prox_abs_thres = value;

	return len;
}

static ssize_t bh1770_chip_id_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct bh1770_chip *chip =  dev_get_drvdata(dev);
	return sprintf(buf, "%s rev %d\n", chip->chipname, chip->revision);
}

static ssize_t bh1770_lux_calib_default_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%u\n", BH1770_CALIB_SCALER);
}

static ssize_t bh1770_lux_calib_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct bh1770_chip *chip = dev_get_drvdata(dev);
	ssize_t len;

	mutex_lock(&chip->mutex);
	len = sprintf(buf, "%u\n", chip->lux_calib);
	mutex_unlock(&chip->mutex);
	return len;
}

static ssize_t bh1770_lux_calib_store(struct device *dev,
				  struct device_attribute *attr,
				  const char *buf, size_t len)
{
	struct bh1770_chip *chip = dev_get_drvdata(dev);
	unsigned long value;
	u32 old_calib;
	u32 new_corr;
	int ret;

	ret = kstrtoul(buf, 0, &value);
	if (ret)
		return ret;

	mutex_lock(&chip->mutex);
	old_calib = chip->lux_calib;
	chip->lux_calib = value;
	new_corr = bh1770_get_corr_value(chip);
	if (new_corr == 0) {
		chip->lux_calib = old_calib;
		mutex_unlock(&chip->mutex);
		return -EINVAL;
	}
	chip->lux_corr = new_corr;
	/* Refresh thresholds on HW after changing correction value */
	bh1770_lux_update_thresholds(chip, chip->lux_threshold_hi,
				chip->lux_threshold_lo);

	mutex_unlock(&chip->mutex);

	return len;
}

static ssize_t bh1770_get_lux_rate_avail(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	int i;
	int pos = 0;
	for (i = 0; i < ARRAY_SIZE(lux_rates_hz); i++)
		pos += sprintf(buf + pos, "%d ", lux_rates_hz[i]);
	sprintf(buf + pos - 1, "\n");
	return pos;
}

static ssize_t bh1770_get_lux_rate(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct bh1770_chip *chip =  dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", lux_rates_hz[chip->lux_rate_index]);
}

static ssize_t bh1770_set_lux_rate(struct device *dev,
				      struct device_attribute *attr,
				      const char *buf, size_t count)
{
	struct bh1770_chip *chip =  dev_get_drvdata(dev);
	unsigned long rate_hz;
	int ret, i;

	ret = kstrtoul(buf, 0, &rate_hz);
	if (ret)
		return ret;

	for (i = 0; i < ARRAY_SIZE(lux_rates_hz) - 1; i++)
		if (rate_hz >= lux_rates_hz[i])
			break;

	mutex_lock(&chip->mutex);
	chip->lux_rate_index = i;
	ret = bh1770_lux_rate(chip, i);
	mutex_unlock(&chip->mutex);

	if (ret < 0)
		return ret;

	return count;
}

static ssize_t bh1770_get_lux_thresh_above(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct bh1770_chip *chip =  dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", chip->lux_threshold_hi);
}

static ssize_t bh1770_get_lux_thresh_below(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct bh1770_chip *chip =  dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", chip->lux_threshold_lo);
}

static ssize_t bh1770_set_lux_thresh(struct bh1770_chip *chip, u16 *target,
				const char *buf)
{
	unsigned long thresh;
	int ret;

	ret = kstrtoul(buf, 0, &thresh);
	if (ret)
		return ret;

	if (thresh > BH1770_LUX_RANGE)
		return -EINVAL;

	mutex_lock(&chip->mutex);
	*target = thresh;
	/*
	 * Don't update values in HW if we are still waiting for
	 * first interrupt to come after device handle open call.
	 */
	if (!chip->lux_wait_result)
		ret = bh1770_lux_update_thresholds(chip,
						chip->lux_threshold_hi,
						chip->lux_threshold_lo);
	mutex_unlock(&chip->mutex);
	return ret;

}

static ssize_t bh1770_set_lux_thresh_above(struct device *dev,
				  struct device_attribute *attr,
				  const char *buf, size_t len)
{
	struct bh1770_chip *chip =  dev_get_drvdata(dev);
	int ret = bh1770_set_lux_thresh(chip, &chip->lux_threshold_hi, buf);
	if (ret < 0)
		return ret;
	return len;
}

static ssize_t bh1770_set_lux_thresh_below(struct device *dev,
				  struct device_attribute *attr,
				  const char *buf, size_t len)
{
	struct bh1770_chip *chip =  dev_get_drvdata(dev);
	int ret = bh1770_set_lux_thresh(chip, &chip->lux_threshold_lo, buf);
	if (ret < 0)
		return ret;
	return len;
}

static DEVICE_ATTR(prox0_raw_en, S_IRUGO | S_IWUSR, bh1770_prox_enable_show,
						bh1770_prox_enable_store);
static DEVICE_ATTR(prox0_thresh_above1_value, S_IRUGO | S_IWUSR,
						bh1770_prox_abs_thres_show,
						bh1770_prox_abs_thres_store);
static DEVICE_ATTR(prox0_thresh_above0_value, S_IRUGO | S_IWUSR,
						bh1770_get_prox_thres,
						bh1770_set_prox_thres);
static DEVICE_ATTR(prox0_raw, S_IRUGO, bh1770_prox_result_show, NULL);
static DEVICE_ATTR(prox0_sensor_range, S_IRUGO, bh1770_prox_range_show, NULL);
static DEVICE_ATTR(prox0_thresh_above_count, S_IRUGO | S_IWUSR,
						bh1770_prox_persistence_show,
						bh1770_prox_persistence_store);
static DEVICE_ATTR(prox0_rate_above, S_IRUGO | S_IWUSR,
						bh1770_get_prox_rate_above,
						bh1770_set_prox_rate_above);
static DEVICE_ATTR(prox0_rate_below, S_IRUGO | S_IWUSR,
						bh1770_get_prox_rate_below,
						bh1770_set_prox_rate_below);
static DEVICE_ATTR(prox0_rate_avail, S_IRUGO, bh1770_get_prox_rate_avail, NULL);

static DEVICE_ATTR(lux0_calibscale, S_IRUGO | S_IWUSR, bh1770_lux_calib_show,
						bh1770_lux_calib_store);
static DEVICE_ATTR(lux0_calibscale_default, S_IRUGO,
						bh1770_lux_calib_default_show,
						NULL);
static DEVICE_ATTR(lux0_input, S_IRUGO, bh1770_lux_result_show, NULL);
static DEVICE_ATTR(lux0_sensor_range, S_IRUGO, bh1770_lux_range_show, NULL);
static DEVICE_ATTR(lux0_rate, S_IRUGO | S_IWUSR, bh1770_get_lux_rate,
						bh1770_set_lux_rate);
static DEVICE_ATTR(lux0_rate_avail, S_IRUGO, bh1770_get_lux_rate_avail, NULL);
static DEVICE_ATTR(lux0_thresh_above_value, S_IRUGO | S_IWUSR,
						bh1770_get_lux_thresh_above,
						bh1770_set_lux_thresh_above);
static DEVICE_ATTR(lux0_thresh_below_value, S_IRUGO | S_IWUSR,
						bh1770_get_lux_thresh_below,
						bh1770_set_lux_thresh_below);
static DEVICE_ATTR(chip_id, S_IRUGO, bh1770_chip_id_show, NULL);
static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR, bh1770_power_state_show,
						 bh1770_power_state_store);


static struct attribute *sysfs_attrs[] = {
	&dev_attr_lux0_calibscale.attr,
	&dev_attr_lux0_calibscale_default.attr,
	&dev_attr_lux0_input.attr,
	&dev_attr_lux0_sensor_range.attr,
	&dev_attr_lux0_rate.attr,
	&dev_attr_lux0_rate_avail.attr,
	&dev_attr_lux0_thresh_above_value.attr,
	&dev_attr_lux0_thresh_below_value.attr,
	&dev_attr_prox0_raw.attr,
	&dev_attr_prox0_sensor_range.attr,
	&dev_attr_prox0_raw_en.attr,
	&dev_attr_prox0_thresh_above_count.attr,
	&dev_attr_prox0_rate_above.attr,
	&dev_attr_prox0_rate_below.attr,
	&dev_attr_prox0_rate_avail.attr,
	&dev_attr_prox0_thresh_above0_value.attr,
	&dev_attr_prox0_thresh_above1_value.attr,
	&dev_attr_chip_id.attr,
	&dev_attr_power_state.attr,
	NULL
};

static struct attribute_group bh1770_attribute_group = {
	.attrs = sysfs_attrs
};

static int bh1770_probe(struct i2c_client *client,
				const struct i2c_device_id *id)
{
	struct bh1770_chip *chip;
	int err;

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

	i2c_set_clientdata(client, chip);
	chip->client  = client;

	mutex_init(&chip->mutex);
	init_waitqueue_head(&chip->wait);
	INIT_DELAYED_WORK(&chip->prox_work, bh1770_prox_work);

	if (client->dev.platform_data == NULL) {
		dev_err(&client->dev, "platform data is mandatory\n");
		return -EINVAL;
	}

	chip->pdata		= client->dev.platform_data;
	chip->lux_calib		= BH1770_LUX_NEUTRAL_CALIB_VALUE;
	chip->lux_rate_index	= BH1770_LUX_DEFAULT_RATE;
	chip->lux_threshold_lo	= BH1770_LUX_DEF_THRES;
	chip->lux_threshold_hi	= BH1770_LUX_DEF_THRES;

	if (chip->pdata->glass_attenuation == 0)
		chip->lux_ga = BH1770_NEUTRAL_GA;
	else
		chip->lux_ga = chip->pdata->glass_attenuation;

	chip->prox_threshold	= BH1770_PROX_DEF_THRES;
	chip->prox_led		= chip->pdata->led_def_curr;
	chip->prox_abs_thres	= BH1770_PROX_DEF_ABS_THRES;
	chip->prox_persistence	= BH1770_DEFAULT_PERSISTENCE;
	chip->prox_rate_threshold = BH1770_PROX_DEF_RATE_THRESH;
	chip->prox_rate		= BH1770_PROX_DEFAULT_RATE;
	chip->prox_data		= 0;

	chip->regs[0].supply = reg_vcc;
	chip->regs[1].supply = reg_vleds;

	err = devm_regulator_bulk_get(&client->dev,
				      ARRAY_SIZE(chip->regs), chip->regs);
	if (err < 0) {
		dev_err(&client->dev, "Cannot get regulators\n");
		return err;
	}

	err = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
				chip->regs);
	if (err < 0) {
		dev_err(&client->dev, "Cannot enable regulators\n");
		return err;
	}

	usleep_range(BH1770_STARTUP_DELAY, BH1770_STARTUP_DELAY * 2);
	err = bh1770_detect(chip);
	if (err < 0)
		goto fail0;

	/* Start chip */
	bh1770_chip_on(chip);
	pm_runtime_set_active(&client->dev);
	pm_runtime_enable(&client->dev);

	chip->lux_corr = bh1770_get_corr_value(chip);
	if (chip->lux_corr == 0) {
		dev_err(&client->dev, "Improper correction values\n");
		err = -EINVAL;
		goto fail0;
	}

	if (chip->pdata->setup_resources) {
		err = chip->pdata->setup_resources();
		if (err) {
			err = -EINVAL;
			goto fail0;
		}
	}

	err = sysfs_create_group(&chip->client->dev.kobj,
				&bh1770_attribute_group);
	if (err < 0) {
		dev_err(&chip->client->dev, "Sysfs registration failed\n");
		goto fail1;
	}

	/*
	 * Chip needs level triggered interrupt to work. However,
	 * level triggering doesn't work always correctly with power
	 * management. Select both
	 */
	err = request_threaded_irq(client->irq, NULL,
				bh1770_irq,
				IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
				IRQF_TRIGGER_LOW,
				"bh1770", chip);
	if (err) {
		dev_err(&client->dev, "could not get IRQ %d\n",
			client->irq);
		goto fail2;
	}
	regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
	return err;
fail2:
	sysfs_remove_group(&chip->client->dev.kobj,
			&bh1770_attribute_group);
fail1:
	if (chip->pdata->release_resources)
		chip->pdata->release_resources();
fail0:
	regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
	return err;
}

static int bh1770_remove(struct i2c_client *client)
{
	struct bh1770_chip *chip = i2c_get_clientdata(client);

	free_irq(client->irq, chip);

	sysfs_remove_group(&chip->client->dev.kobj,
			&bh1770_attribute_group);

	if (chip->pdata->release_resources)
		chip->pdata->release_resources();

	cancel_delayed_work_sync(&chip->prox_work);

	if (!pm_runtime_suspended(&client->dev))
		bh1770_chip_off(chip);

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

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int bh1770_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct bh1770_chip *chip = i2c_get_clientdata(client);

	bh1770_chip_off(chip);

	return 0;
}

static int bh1770_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct bh1770_chip *chip = i2c_get_clientdata(client);
	int ret = 0;

	bh1770_chip_on(chip);

	if (!pm_runtime_suspended(dev)) {
		/*
		 * If we were enabled at suspend time, it is expected
		 * everything works nice and smoothly
		 */
		ret = bh1770_lux_rate(chip, chip->lux_rate_index);
		ret |= bh1770_lux_interrupt_control(chip, BH1770_ENABLE);

		/* This causes interrupt after the next measurement cycle */
		bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
					BH1770_LUX_DEF_THRES);
		/* Inform that we are waiting for a result from ALS */
		chip->lux_wait_result = true;
		bh1770_prox_mode_control(chip);
	}
	return ret;
}
#endif

#ifdef CONFIG_PM
static int bh1770_runtime_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct bh1770_chip *chip = i2c_get_clientdata(client);

	bh1770_chip_off(chip);

	return 0;
}

static int bh1770_runtime_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct bh1770_chip *chip = i2c_get_clientdata(client);

	bh1770_chip_on(chip);

	return 0;
}
#endif

static const struct i2c_device_id bh1770_id[] = {
	{"bh1770glc", 0 },
	{"sfh7770", 0 },
	{}
};

MODULE_DEVICE_TABLE(i2c, bh1770_id);

static const struct dev_pm_ops bh1770_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(bh1770_suspend, bh1770_resume)
	SET_RUNTIME_PM_OPS(bh1770_runtime_suspend, bh1770_runtime_resume, NULL)
};

static struct i2c_driver bh1770_driver = {
	.driver	 = {
		.name	= "bh1770glc",
		.pm	= &bh1770_pm_ops,
	},
	.probe	  = bh1770_probe,
	.remove	  = bh1770_remove,
	.id_table = bh1770_id,
};

module_i2c_driver(bh1770_driver);

MODULE_DESCRIPTION("BH1770GLC / SFH7770 combined ALS and proximity sensor");
MODULE_AUTHOR("Samu Onkalo, Nokia Corporation");
MODULE_LICENSE("GPL v2");