Xen: don't warn about 2-byte wchar_t in efi
[linux-2.6-block.git] / drivers / misc / bh1770glc.c
1 /*
2  * This file is part of the ROHM BH1770GLC / OSRAM SFH7770 sensor driver.
3  * Chip is combined proximity and ambient light sensor.
4  *
5  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
6  *
7  * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
8  *
9  * This program is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU General Public License
11  * version 2 as published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful, but
14  * WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
21  * 02110-1301 USA
22  *
23  */
24
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/i2c.h>
28 #include <linux/interrupt.h>
29 #include <linux/mutex.h>
30 #include <linux/i2c/bh1770glc.h>
31 #include <linux/regulator/consumer.h>
32 #include <linux/pm_runtime.h>
33 #include <linux/workqueue.h>
34 #include <linux/delay.h>
35 #include <linux/wait.h>
36 #include <linux/slab.h>
37
38 #define BH1770_ALS_CONTROL      0x80 /* ALS operation mode control */
39 #define BH1770_PS_CONTROL       0x81 /* PS operation mode control */
40 #define BH1770_I_LED            0x82 /* active LED and LED1, LED2 current */
41 #define BH1770_I_LED3           0x83 /* LED3 current setting */
42 #define BH1770_ALS_PS_MEAS      0x84 /* Forced mode trigger */
43 #define BH1770_PS_MEAS_RATE     0x85 /* PS meas. rate at stand alone mode */
44 #define BH1770_ALS_MEAS_RATE    0x86 /* ALS meas. rate at stand alone mode */
45 #define BH1770_PART_ID          0x8a /* Part number and revision ID */
46 #define BH1770_MANUFACT_ID      0x8b /* Manufacturerer ID */
47 #define BH1770_ALS_DATA_0       0x8c /* ALS DATA low byte */
48 #define BH1770_ALS_DATA_1       0x8d /* ALS DATA high byte */
49 #define BH1770_ALS_PS_STATUS    0x8e /* Measurement data and int status */
50 #define BH1770_PS_DATA_LED1     0x8f /* PS data from LED1 */
51 #define BH1770_PS_DATA_LED2     0x90 /* PS data from LED2 */
52 #define BH1770_PS_DATA_LED3     0x91 /* PS data from LED3 */
53 #define BH1770_INTERRUPT        0x92 /* Interrupt setting */
54 #define BH1770_PS_TH_LED1       0x93 /* PS interrupt threshold for LED1 */
55 #define BH1770_PS_TH_LED2       0x94 /* PS interrupt threshold for LED2 */
56 #define BH1770_PS_TH_LED3       0x95 /* PS interrupt threshold for LED3 */
57 #define BH1770_ALS_TH_UP_0      0x96 /* ALS upper threshold low byte */
58 #define BH1770_ALS_TH_UP_1      0x97 /* ALS upper threshold high byte */
59 #define BH1770_ALS_TH_LOW_0     0x98 /* ALS lower threshold low byte */
60 #define BH1770_ALS_TH_LOW_1     0x99 /* ALS lower threshold high byte */
61
62 /* MANUFACT_ID */
63 #define BH1770_MANUFACT_ROHM    0x01
64 #define BH1770_MANUFACT_OSRAM   0x03
65
66 /* PART_ID */
67 #define BH1770_PART             0x90
68 #define BH1770_PART_MASK        0xf0
69 #define BH1770_REV_MASK         0x0f
70 #define BH1770_REV_SHIFT        0
71 #define BH1770_REV_0            0x00
72 #define BH1770_REV_1            0x01
73
74 /* Operating modes for both */
75 #define BH1770_STANDBY          0x00
76 #define BH1770_FORCED           0x02
77 #define BH1770_STANDALONE       0x03
78 #define BH1770_SWRESET          (0x01 << 2)
79
80 #define BH1770_PS_TRIG_MEAS     (1 << 0)
81 #define BH1770_ALS_TRIG_MEAS    (1 << 1)
82
83 /* Interrupt control */
84 #define BH1770_INT_OUTPUT_MODE  (1 << 3) /* 0 = latched */
85 #define BH1770_INT_POLARITY     (1 << 2) /* 1 = active high */
86 #define BH1770_INT_ALS_ENA      (1 << 1)
87 #define BH1770_INT_PS_ENA       (1 << 0)
88
89 /* Interrupt status */
90 #define BH1770_INT_LED1_DATA    (1 << 0)
91 #define BH1770_INT_LED1_INT     (1 << 1)
92 #define BH1770_INT_LED2_DATA    (1 << 2)
93 #define BH1770_INT_LED2_INT     (1 << 3)
94 #define BH1770_INT_LED3_DATA    (1 << 4)
95 #define BH1770_INT_LED3_INT     (1 << 5)
96 #define BH1770_INT_LEDS_INT     ((1 << 1) | (1 << 3) | (1 << 5))
97 #define BH1770_INT_ALS_DATA     (1 << 6)
98 #define BH1770_INT_ALS_INT      (1 << 7)
99
100 /* Led channels */
101 #define BH1770_LED1             0x00
102
103 #define BH1770_DISABLE          0
104 #define BH1770_ENABLE           1
105 #define BH1770_PROX_CHANNELS    1
106
107 #define BH1770_LUX_DEFAULT_RATE 1 /* Index to lux rate table */
108 #define BH1770_PROX_DEFAULT_RATE 1 /* Direct HW value =~ 50Hz */
109 #define BH1770_PROX_DEF_RATE_THRESH 6 /* Direct HW value =~ 5 Hz */
110 #define BH1770_STARTUP_DELAY    50
111 #define BH1770_RESET_TIME       10
112 #define BH1770_TIMEOUT          2100 /* Timeout in 2.1 seconds */
113
114 #define BH1770_LUX_RANGE        65535
115 #define BH1770_PROX_RANGE       255
116 #define BH1770_COEF_SCALER      1024
117 #define BH1770_CALIB_SCALER     8192
118 #define BH1770_LUX_NEUTRAL_CALIB_VALUE (1 * BH1770_CALIB_SCALER)
119 #define BH1770_LUX_DEF_THRES    1000
120 #define BH1770_PROX_DEF_THRES   70
121 #define BH1770_PROX_DEF_ABS_THRES   100
122 #define BH1770_DEFAULT_PERSISTENCE  10
123 #define BH1770_PROX_MAX_PERSISTENCE 50
124 #define BH1770_LUX_GA_SCALE     16384
125 #define BH1770_LUX_CF_SCALE     2048 /* CF ChipFactor */
126 #define BH1770_NEUTRAL_CF       BH1770_LUX_CF_SCALE
127 #define BH1770_LUX_CORR_SCALE   4096
128
129 #define PROX_ABOVE_THRESHOLD    1
130 #define PROX_BELOW_THRESHOLD    0
131
132 #define PROX_IGNORE_LUX_LIMIT   500
133
134 struct bh1770_chip {
135         struct bh1770_platform_data     *pdata;
136         char                            chipname[10];
137         u8                              revision;
138         struct i2c_client               *client;
139         struct regulator_bulk_data      regs[2];
140         struct mutex                    mutex; /* avoid parallel access */
141         wait_queue_head_t               wait;
142
143         bool                    int_mode_prox;
144         bool                    int_mode_lux;
145         struct delayed_work     prox_work;
146         u32     lux_cf; /* Chip specific factor */
147         u32     lux_ga;
148         u32     lux_calib;
149         int     lux_rate_index;
150         u32     lux_corr;
151         u16     lux_data_raw;
152         u16     lux_threshold_hi;
153         u16     lux_threshold_lo;
154         u16     lux_thres_hi_onchip;
155         u16     lux_thres_lo_onchip;
156         bool    lux_wait_result;
157
158         int     prox_enable_count;
159         u16     prox_coef;
160         u16     prox_const;
161         int     prox_rate;
162         int     prox_rate_threshold;
163         u8      prox_persistence;
164         u8      prox_persistence_counter;
165         u8      prox_data;
166         u8      prox_threshold;
167         u8      prox_threshold_hw;
168         bool    prox_force_update;
169         u8      prox_abs_thres;
170         u8      prox_led;
171 };
172
173 static const char reg_vcc[] = "Vcc";
174 static const char reg_vleds[] = "Vleds";
175
176 /*
177  * Supported stand alone rates in ms from chip data sheet
178  * {10, 20, 30, 40, 70, 100, 200, 500, 1000, 2000};
179  */
180 static const s16 prox_rates_hz[] = {100, 50, 33, 25, 14, 10, 5, 2};
181 static const s16 prox_rates_ms[] = {10, 20, 30, 40, 70, 100, 200, 500};
182
183 /* Supported IR-led currents in mA */
184 static const u8 prox_curr_ma[] = {5, 10, 20, 50, 100, 150, 200};
185
186 /*
187  * Supported stand alone rates in ms from chip data sheet
188  * {100, 200, 500, 1000, 2000};
189  */
190 static const s16 lux_rates_hz[] = {10, 5, 2, 1, 0};
191
192 /*
193  * interrupt control functions are called while keeping chip->mutex
194  * excluding module probe / remove
195  */
196 static inline int bh1770_lux_interrupt_control(struct bh1770_chip *chip,
197                                         int lux)
198 {
199         chip->int_mode_lux = lux;
200         /* Set interrupt modes, interrupt active low, latched */
201         return i2c_smbus_write_byte_data(chip->client,
202                                         BH1770_INTERRUPT,
203                                         (lux << 1) | chip->int_mode_prox);
204 }
205
206 static inline int bh1770_prox_interrupt_control(struct bh1770_chip *chip,
207                                         int ps)
208 {
209         chip->int_mode_prox = ps;
210         return i2c_smbus_write_byte_data(chip->client,
211                                         BH1770_INTERRUPT,
212                                         (chip->int_mode_lux << 1) | (ps << 0));
213 }
214
215 /* chip->mutex is always kept here */
216 static int bh1770_lux_rate(struct bh1770_chip *chip, int rate_index)
217 {
218         /* sysfs may call this when the chip is powered off */
219         if (pm_runtime_suspended(&chip->client->dev))
220                 return 0;
221
222         /* Proper proximity response needs fastest lux rate (100ms) */
223         if (chip->prox_enable_count)
224                 rate_index = 0;
225
226         return i2c_smbus_write_byte_data(chip->client,
227                                         BH1770_ALS_MEAS_RATE,
228                                         rate_index);
229 }
230
231 static int bh1770_prox_rate(struct bh1770_chip *chip, int mode)
232 {
233         int rate;
234
235         rate = (mode == PROX_ABOVE_THRESHOLD) ?
236                 chip->prox_rate_threshold : chip->prox_rate;
237
238         return i2c_smbus_write_byte_data(chip->client,
239                                         BH1770_PS_MEAS_RATE,
240                                         rate);
241 }
242
243 /* InfraredLED is controlled by the chip during proximity scanning */
244 static inline int bh1770_led_cfg(struct bh1770_chip *chip)
245 {
246         /* LED cfg, current for leds 1 and 2 */
247         return i2c_smbus_write_byte_data(chip->client,
248                                         BH1770_I_LED,
249                                         (BH1770_LED1 << 6) |
250                                         (BH1770_LED_5mA << 3) |
251                                         chip->prox_led);
252 }
253
254 /*
255  * Following two functions converts raw ps values from HW to normalized
256  * values. Purpose is to compensate differences between different sensor
257  * versions and variants so that result means about the same between
258  * versions.
259  */
260 static inline u8 bh1770_psraw_to_adjusted(struct bh1770_chip *chip, u8 psraw)
261 {
262         u16 adjusted;
263         adjusted = (u16)(((u32)(psraw + chip->prox_const) * chip->prox_coef) /
264                 BH1770_COEF_SCALER);
265         if (adjusted > BH1770_PROX_RANGE)
266                 adjusted = BH1770_PROX_RANGE;
267         return adjusted;
268 }
269
270 static inline u8 bh1770_psadjusted_to_raw(struct bh1770_chip *chip, u8 ps)
271 {
272         u16 raw;
273
274         raw = (((u32)ps * BH1770_COEF_SCALER) / chip->prox_coef);
275         if (raw > chip->prox_const)
276                 raw = raw - chip->prox_const;
277         else
278                 raw = 0;
279         return raw;
280 }
281
282 /*
283  * Following two functions converts raw lux values from HW to normalized
284  * values. Purpose is to compensate differences between different sensor
285  * versions and variants so that result means about the same between
286  * versions. Chip->mutex is kept when this is called.
287  */
288 static int bh1770_prox_set_threshold(struct bh1770_chip *chip)
289 {
290         u8 tmp = 0;
291
292         /* sysfs may call this when the chip is powered off */
293         if (pm_runtime_suspended(&chip->client->dev))
294                 return 0;
295
296         tmp = bh1770_psadjusted_to_raw(chip, chip->prox_threshold);
297         chip->prox_threshold_hw = tmp;
298
299         return  i2c_smbus_write_byte_data(chip->client, BH1770_PS_TH_LED1,
300                                         tmp);
301 }
302
303 static inline u16 bh1770_lux_raw_to_adjusted(struct bh1770_chip *chip, u16 raw)
304 {
305         u32 lux;
306         lux = ((u32)raw * chip->lux_corr) / BH1770_LUX_CORR_SCALE;
307         return min(lux, (u32)BH1770_LUX_RANGE);
308 }
309
310 static inline u16 bh1770_lux_adjusted_to_raw(struct bh1770_chip *chip,
311                                         u16 adjusted)
312 {
313         return (u32)adjusted * BH1770_LUX_CORR_SCALE / chip->lux_corr;
314 }
315
316 /* chip->mutex is kept when this is called */
317 static int bh1770_lux_update_thresholds(struct bh1770_chip *chip,
318                                         u16 threshold_hi, u16 threshold_lo)
319 {
320         u8 data[4];
321         int ret;
322
323         /* sysfs may call this when the chip is powered off */
324         if (pm_runtime_suspended(&chip->client->dev))
325                 return 0;
326
327         /*
328          * Compensate threshold values with the correction factors if not
329          * set to minimum or maximum.
330          * Min & max values disables interrupts.
331          */
332         if (threshold_hi != BH1770_LUX_RANGE && threshold_hi != 0)
333                 threshold_hi = bh1770_lux_adjusted_to_raw(chip, threshold_hi);
334
335         if (threshold_lo != BH1770_LUX_RANGE && threshold_lo != 0)
336                 threshold_lo = bh1770_lux_adjusted_to_raw(chip, threshold_lo);
337
338         if (chip->lux_thres_hi_onchip == threshold_hi &&
339             chip->lux_thres_lo_onchip == threshold_lo)
340                 return 0;
341
342         chip->lux_thres_hi_onchip = threshold_hi;
343         chip->lux_thres_lo_onchip = threshold_lo;
344
345         data[0] = threshold_hi;
346         data[1] = threshold_hi >> 8;
347         data[2] = threshold_lo;
348         data[3] = threshold_lo >> 8;
349
350         ret = i2c_smbus_write_i2c_block_data(chip->client,
351                                         BH1770_ALS_TH_UP_0,
352                                         ARRAY_SIZE(data),
353                                         data);
354         return ret;
355 }
356
357 static int bh1770_lux_get_result(struct bh1770_chip *chip)
358 {
359         u16 data;
360         int ret;
361
362         ret = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_DATA_0);
363         if (ret < 0)
364                 return ret;
365
366         data = ret & 0xff;
367         ret = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_DATA_1);
368         if (ret < 0)
369                 return ret;
370
371         chip->lux_data_raw = data | ((ret & 0xff) << 8);
372
373         return 0;
374 }
375
376 /* Calculate correction value which contains chip and device specific parts */
377 static u32 bh1770_get_corr_value(struct bh1770_chip *chip)
378 {
379         u32 tmp;
380         /* Impact of glass attenuation correction */
381         tmp = (BH1770_LUX_CORR_SCALE * chip->lux_ga) / BH1770_LUX_GA_SCALE;
382         /* Impact of chip factor correction */
383         tmp = (tmp * chip->lux_cf) / BH1770_LUX_CF_SCALE;
384         /* Impact of Device specific calibration correction */
385         tmp = (tmp * chip->lux_calib) / BH1770_CALIB_SCALER;
386         return tmp;
387 }
388
389 static int bh1770_lux_read_result(struct bh1770_chip *chip)
390 {
391         bh1770_lux_get_result(chip);
392         return bh1770_lux_raw_to_adjusted(chip, chip->lux_data_raw);
393 }
394
395 /*
396  * Chip on / off functions are called while keeping mutex except probe
397  * or remove phase
398  */
399 static int bh1770_chip_on(struct bh1770_chip *chip)
400 {
401         int ret = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
402                                         chip->regs);
403         if (ret < 0)
404                 return ret;
405
406         usleep_range(BH1770_STARTUP_DELAY, BH1770_STARTUP_DELAY * 2);
407
408         /* Reset the chip */
409         i2c_smbus_write_byte_data(chip->client, BH1770_ALS_CONTROL,
410                                 BH1770_SWRESET);
411         usleep_range(BH1770_RESET_TIME, BH1770_RESET_TIME * 2);
412
413         /*
414          * ALS is started always since proximity needs als results
415          * for realibility estimation.
416          * Let's assume dark until the first ALS measurement is ready.
417          */
418         chip->lux_data_raw = 0;
419         chip->prox_data = 0;
420         ret = i2c_smbus_write_byte_data(chip->client,
421                                         BH1770_ALS_CONTROL, BH1770_STANDALONE);
422
423         /* Assume reset defaults */
424         chip->lux_thres_hi_onchip = BH1770_LUX_RANGE;
425         chip->lux_thres_lo_onchip = 0;
426
427         return ret;
428 }
429
430 static void bh1770_chip_off(struct bh1770_chip *chip)
431 {
432         i2c_smbus_write_byte_data(chip->client,
433                                         BH1770_INTERRUPT, BH1770_DISABLE);
434         i2c_smbus_write_byte_data(chip->client,
435                                 BH1770_ALS_CONTROL, BH1770_STANDBY);
436         i2c_smbus_write_byte_data(chip->client,
437                                 BH1770_PS_CONTROL, BH1770_STANDBY);
438         regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
439 }
440
441 /* chip->mutex is kept when this is called */
442 static int bh1770_prox_mode_control(struct bh1770_chip *chip)
443 {
444         if (chip->prox_enable_count) {
445                 chip->prox_force_update = true; /* Force immediate update */
446
447                 bh1770_lux_rate(chip, chip->lux_rate_index);
448                 bh1770_prox_set_threshold(chip);
449                 bh1770_led_cfg(chip);
450                 bh1770_prox_rate(chip, PROX_BELOW_THRESHOLD);
451                 bh1770_prox_interrupt_control(chip, BH1770_ENABLE);
452                 i2c_smbus_write_byte_data(chip->client,
453                                         BH1770_PS_CONTROL, BH1770_STANDALONE);
454         } else {
455                 chip->prox_data = 0;
456                 bh1770_lux_rate(chip, chip->lux_rate_index);
457                 bh1770_prox_interrupt_control(chip, BH1770_DISABLE);
458                 i2c_smbus_write_byte_data(chip->client,
459                                         BH1770_PS_CONTROL, BH1770_STANDBY);
460         }
461         return 0;
462 }
463
464 /* chip->mutex is kept when this is called */
465 static int bh1770_prox_read_result(struct bh1770_chip *chip)
466 {
467         int ret;
468         bool above;
469         u8 mode;
470
471         ret = i2c_smbus_read_byte_data(chip->client, BH1770_PS_DATA_LED1);
472         if (ret < 0)
473                 goto out;
474
475         if (ret > chip->prox_threshold_hw)
476                 above = true;
477         else
478                 above = false;
479
480         /*
481          * when ALS levels goes above limit, proximity result may be
482          * false proximity. Thus ignore the result. With real proximity
483          * there is a shadow causing low als levels.
484          */
485         if (chip->lux_data_raw > PROX_IGNORE_LUX_LIMIT)
486                 ret = 0;
487
488         chip->prox_data = bh1770_psraw_to_adjusted(chip, ret);
489
490         /* Strong proximity level or force mode requires immediate response */
491         if (chip->prox_data >= chip->prox_abs_thres ||
492             chip->prox_force_update)
493                 chip->prox_persistence_counter = chip->prox_persistence;
494
495         chip->prox_force_update = false;
496
497         /* Persistence filttering to reduce false proximity events */
498         if (likely(above)) {
499                 if (chip->prox_persistence_counter < chip->prox_persistence) {
500                         chip->prox_persistence_counter++;
501                         ret = -ENODATA;
502                 } else {
503                         mode = PROX_ABOVE_THRESHOLD;
504                         ret = 0;
505                 }
506         } else {
507                 chip->prox_persistence_counter = 0;
508                 mode = PROX_BELOW_THRESHOLD;
509                 chip->prox_data = 0;
510                 ret = 0;
511         }
512
513         /* Set proximity detection rate based on above or below value */
514         if (ret == 0) {
515                 bh1770_prox_rate(chip, mode);
516                 sysfs_notify(&chip->client->dev.kobj, NULL, "prox0_raw");
517         }
518 out:
519         return ret;
520 }
521
522 static int bh1770_detect(struct bh1770_chip *chip)
523 {
524         struct i2c_client *client = chip->client;
525         s32 ret;
526         u8 manu, part;
527
528         ret = i2c_smbus_read_byte_data(client, BH1770_MANUFACT_ID);
529         if (ret < 0)
530                 goto error;
531         manu = (u8)ret;
532
533         ret = i2c_smbus_read_byte_data(client, BH1770_PART_ID);
534         if (ret < 0)
535                 goto error;
536         part = (u8)ret;
537
538         chip->revision = (part & BH1770_REV_MASK) >> BH1770_REV_SHIFT;
539         chip->prox_coef = BH1770_COEF_SCALER;
540         chip->prox_const = 0;
541         chip->lux_cf = BH1770_NEUTRAL_CF;
542
543         if ((manu == BH1770_MANUFACT_ROHM) &&
544             ((part & BH1770_PART_MASK) == BH1770_PART)) {
545                 snprintf(chip->chipname, sizeof(chip->chipname), "BH1770GLC");
546                 return 0;
547         }
548
549         if ((manu == BH1770_MANUFACT_OSRAM) &&
550             ((part & BH1770_PART_MASK) == BH1770_PART)) {
551                 snprintf(chip->chipname, sizeof(chip->chipname), "SFH7770");
552                 /* Values selected by comparing different versions */
553                 chip->prox_coef = 819; /* 0.8 * BH1770_COEF_SCALER */
554                 chip->prox_const = 40;
555                 return 0;
556         }
557
558         ret = -ENODEV;
559 error:
560         dev_dbg(&client->dev, "BH1770 or SFH7770 not found\n");
561
562         return ret;
563 }
564
565 /*
566  * This work is re-scheduled at every proximity interrupt.
567  * If this work is running, it means that there hasn't been any
568  * proximity interrupt in time. Situation is handled as no-proximity.
569  * It would be nice to have low-threshold interrupt or interrupt
570  * when measurement and hi-threshold are both 0. But neither of those exists.
571  * This is a workaroud for missing HW feature.
572  */
573
574 static void bh1770_prox_work(struct work_struct *work)
575 {
576         struct bh1770_chip *chip =
577                 container_of(work, struct bh1770_chip, prox_work.work);
578
579         mutex_lock(&chip->mutex);
580         bh1770_prox_read_result(chip);
581         mutex_unlock(&chip->mutex);
582 }
583
584 /* This is threaded irq handler */
585 static irqreturn_t bh1770_irq(int irq, void *data)
586 {
587         struct bh1770_chip *chip = data;
588         int status;
589         int rate = 0;
590
591         mutex_lock(&chip->mutex);
592         status = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_PS_STATUS);
593
594         /* Acknowledge interrupt by reading this register */
595         i2c_smbus_read_byte_data(chip->client, BH1770_INTERRUPT);
596
597         /*
598          * Check if there is fresh data available for als.
599          * If this is the very first data, update thresholds after that.
600          */
601         if (status & BH1770_INT_ALS_DATA) {
602                 bh1770_lux_get_result(chip);
603                 if (unlikely(chip->lux_wait_result)) {
604                         chip->lux_wait_result = false;
605                         wake_up(&chip->wait);
606                         bh1770_lux_update_thresholds(chip,
607                                                 chip->lux_threshold_hi,
608                                                 chip->lux_threshold_lo);
609                 }
610         }
611
612         /* Disable interrupt logic to guarantee acknowledgement */
613         i2c_smbus_write_byte_data(chip->client, BH1770_INTERRUPT,
614                                   (0 << 1) | (0 << 0));
615
616         if ((status & BH1770_INT_ALS_INT))
617                 sysfs_notify(&chip->client->dev.kobj, NULL, "lux0_input");
618
619         if (chip->int_mode_prox && (status & BH1770_INT_LEDS_INT)) {
620                 rate = prox_rates_ms[chip->prox_rate_threshold];
621                 bh1770_prox_read_result(chip);
622         }
623
624         /* Re-enable interrupt logic */
625         i2c_smbus_write_byte_data(chip->client, BH1770_INTERRUPT,
626                                   (chip->int_mode_lux << 1) |
627                                   (chip->int_mode_prox << 0));
628         mutex_unlock(&chip->mutex);
629
630         /*
631          * Can't cancel work while keeping mutex since the work uses the
632          * same mutex.
633          */
634         if (rate) {
635                 /*
636                  * Simulate missing no-proximity interrupt 50ms after the
637                  * next expected interrupt time.
638                  */
639                 cancel_delayed_work_sync(&chip->prox_work);
640                 schedule_delayed_work(&chip->prox_work,
641                                 msecs_to_jiffies(rate + 50));
642         }
643         return IRQ_HANDLED;
644 }
645
646 static ssize_t bh1770_power_state_store(struct device *dev,
647                                       struct device_attribute *attr,
648                                       const char *buf, size_t count)
649 {
650         struct bh1770_chip *chip =  dev_get_drvdata(dev);
651         unsigned long value;
652         ssize_t ret;
653
654         ret = kstrtoul(buf, 0, &value);
655         if (ret)
656                 return ret;
657
658         mutex_lock(&chip->mutex);
659         if (value) {
660                 pm_runtime_get_sync(dev);
661
662                 ret = bh1770_lux_rate(chip, chip->lux_rate_index);
663                 if (ret < 0) {
664                         pm_runtime_put(dev);
665                         goto leave;
666                 }
667
668                 ret = bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
669                 if (ret < 0) {
670                         pm_runtime_put(dev);
671                         goto leave;
672                 }
673
674                 /* This causes interrupt after the next measurement cycle */
675                 bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
676                                         BH1770_LUX_DEF_THRES);
677                 /* Inform that we are waiting for a result from ALS */
678                 chip->lux_wait_result = true;
679                 bh1770_prox_mode_control(chip);
680         } else if (!pm_runtime_suspended(dev)) {
681                 pm_runtime_put(dev);
682         }
683         ret = count;
684 leave:
685         mutex_unlock(&chip->mutex);
686         return ret;
687 }
688
689 static ssize_t bh1770_power_state_show(struct device *dev,
690                                    struct device_attribute *attr, char *buf)
691 {
692         return sprintf(buf, "%d\n", !pm_runtime_suspended(dev));
693 }
694
695 static ssize_t bh1770_lux_result_show(struct device *dev,
696                                    struct device_attribute *attr, char *buf)
697 {
698         struct bh1770_chip *chip =  dev_get_drvdata(dev);
699         ssize_t ret;
700         long timeout;
701
702         if (pm_runtime_suspended(dev))
703                 return -EIO; /* Chip is not enabled at all */
704
705         timeout = wait_event_interruptible_timeout(chip->wait,
706                                         !chip->lux_wait_result,
707                                         msecs_to_jiffies(BH1770_TIMEOUT));
708         if (!timeout)
709                 return -EIO;
710
711         mutex_lock(&chip->mutex);
712         ret = sprintf(buf, "%d\n", bh1770_lux_read_result(chip));
713         mutex_unlock(&chip->mutex);
714
715         return ret;
716 }
717
718 static ssize_t bh1770_lux_range_show(struct device *dev,
719                                    struct device_attribute *attr, char *buf)
720 {
721         return sprintf(buf, "%d\n", BH1770_LUX_RANGE);
722 }
723
724 static ssize_t bh1770_prox_enable_store(struct device *dev,
725                                       struct device_attribute *attr,
726                                       const char *buf, size_t count)
727 {
728         struct bh1770_chip *chip =  dev_get_drvdata(dev);
729         unsigned long value;
730         int ret;
731
732         ret = kstrtoul(buf, 0, &value);
733         if (ret)
734                 return ret;
735
736         mutex_lock(&chip->mutex);
737         /* Assume no proximity. Sensor will tell real state soon */
738         if (!chip->prox_enable_count)
739                 chip->prox_data = 0;
740
741         if (value)
742                 chip->prox_enable_count++;
743         else if (chip->prox_enable_count > 0)
744                 chip->prox_enable_count--;
745         else
746                 goto leave;
747
748         /* Run control only when chip is powered on */
749         if (!pm_runtime_suspended(dev))
750                 bh1770_prox_mode_control(chip);
751 leave:
752         mutex_unlock(&chip->mutex);
753         return count;
754 }
755
756 static ssize_t bh1770_prox_enable_show(struct device *dev,
757                                    struct device_attribute *attr, char *buf)
758 {
759         struct bh1770_chip *chip =  dev_get_drvdata(dev);
760         ssize_t len;
761
762         mutex_lock(&chip->mutex);
763         len = sprintf(buf, "%d\n", chip->prox_enable_count);
764         mutex_unlock(&chip->mutex);
765         return len;
766 }
767
768 static ssize_t bh1770_prox_result_show(struct device *dev,
769                                    struct device_attribute *attr, char *buf)
770 {
771         struct bh1770_chip *chip =  dev_get_drvdata(dev);
772         ssize_t ret;
773
774         mutex_lock(&chip->mutex);
775         if (chip->prox_enable_count && !pm_runtime_suspended(dev))
776                 ret = sprintf(buf, "%d\n", chip->prox_data);
777         else
778                 ret = -EIO;
779         mutex_unlock(&chip->mutex);
780         return ret;
781 }
782
783 static ssize_t bh1770_prox_range_show(struct device *dev,
784                                    struct device_attribute *attr, char *buf)
785 {
786         return sprintf(buf, "%d\n", BH1770_PROX_RANGE);
787 }
788
789 static ssize_t bh1770_get_prox_rate_avail(struct device *dev,
790                                    struct device_attribute *attr, char *buf)
791 {
792         int i;
793         int pos = 0;
794         for (i = 0; i < ARRAY_SIZE(prox_rates_hz); i++)
795                 pos += sprintf(buf + pos, "%d ", prox_rates_hz[i]);
796         sprintf(buf + pos - 1, "\n");
797         return pos;
798 }
799
800 static ssize_t bh1770_get_prox_rate_above(struct device *dev,
801                                    struct device_attribute *attr, char *buf)
802 {
803         struct bh1770_chip *chip =  dev_get_drvdata(dev);
804         return sprintf(buf, "%d\n", prox_rates_hz[chip->prox_rate_threshold]);
805 }
806
807 static ssize_t bh1770_get_prox_rate_below(struct device *dev,
808                                    struct device_attribute *attr, char *buf)
809 {
810         struct bh1770_chip *chip =  dev_get_drvdata(dev);
811         return sprintf(buf, "%d\n", prox_rates_hz[chip->prox_rate]);
812 }
813
814 static int bh1770_prox_rate_validate(int rate)
815 {
816         int i;
817
818         for (i = 0; i < ARRAY_SIZE(prox_rates_hz) - 1; i++)
819                 if (rate >= prox_rates_hz[i])
820                         break;
821         return i;
822 }
823
824 static ssize_t bh1770_set_prox_rate_above(struct device *dev,
825                                         struct device_attribute *attr,
826                                         const char *buf, size_t count)
827 {
828         struct bh1770_chip *chip =  dev_get_drvdata(dev);
829         unsigned long value;
830         int ret;
831
832         ret = kstrtoul(buf, 0, &value);
833         if (ret)
834                 return ret;
835
836         mutex_lock(&chip->mutex);
837         chip->prox_rate_threshold = bh1770_prox_rate_validate(value);
838         mutex_unlock(&chip->mutex);
839         return count;
840 }
841
842 static ssize_t bh1770_set_prox_rate_below(struct device *dev,
843                                         struct device_attribute *attr,
844                                         const char *buf, size_t count)
845 {
846         struct bh1770_chip *chip =  dev_get_drvdata(dev);
847         unsigned long value;
848         int ret;
849
850         ret = kstrtoul(buf, 0, &value);
851         if (ret)
852                 return ret;
853
854         mutex_lock(&chip->mutex);
855         chip->prox_rate = bh1770_prox_rate_validate(value);
856         mutex_unlock(&chip->mutex);
857         return count;
858 }
859
860 static ssize_t bh1770_get_prox_thres(struct device *dev,
861                                    struct device_attribute *attr, char *buf)
862 {
863         struct bh1770_chip *chip =  dev_get_drvdata(dev);
864         return sprintf(buf, "%d\n", chip->prox_threshold);
865 }
866
867 static ssize_t bh1770_set_prox_thres(struct device *dev,
868                                       struct device_attribute *attr,
869                                       const char *buf, size_t count)
870 {
871         struct bh1770_chip *chip =  dev_get_drvdata(dev);
872         unsigned long value;
873         int ret;
874
875         ret = kstrtoul(buf, 0, &value);
876         if (ret)
877                 return ret;
878
879         if (value > BH1770_PROX_RANGE)
880                 return -EINVAL;
881
882         mutex_lock(&chip->mutex);
883         chip->prox_threshold = value;
884         ret = bh1770_prox_set_threshold(chip);
885         mutex_unlock(&chip->mutex);
886         if (ret < 0)
887                 return ret;
888         return count;
889 }
890
891 static ssize_t bh1770_prox_persistence_show(struct device *dev,
892                                  struct device_attribute *attr, char *buf)
893 {
894         struct bh1770_chip *chip = dev_get_drvdata(dev);
895
896         return sprintf(buf, "%u\n", chip->prox_persistence);
897 }
898
899 static ssize_t bh1770_prox_persistence_store(struct device *dev,
900                                 struct device_attribute *attr,
901                                 const char *buf, size_t len)
902 {
903         struct bh1770_chip *chip = dev_get_drvdata(dev);
904         unsigned long value;
905         int ret;
906
907         ret = kstrtoul(buf, 0, &value);
908         if (ret)
909                 return ret;
910
911         if (value > BH1770_PROX_MAX_PERSISTENCE)
912                 return -EINVAL;
913
914         chip->prox_persistence = value;
915
916         return len;
917 }
918
919 static ssize_t bh1770_prox_abs_thres_show(struct device *dev,
920                                  struct device_attribute *attr, char *buf)
921 {
922         struct bh1770_chip *chip = dev_get_drvdata(dev);
923         return sprintf(buf, "%u\n", chip->prox_abs_thres);
924 }
925
926 static ssize_t bh1770_prox_abs_thres_store(struct device *dev,
927                                 struct device_attribute *attr,
928                                 const char *buf, size_t len)
929 {
930         struct bh1770_chip *chip = dev_get_drvdata(dev);
931         unsigned long value;
932         int ret;
933
934         ret = kstrtoul(buf, 0, &value);
935         if (ret)
936                 return ret;
937
938         if (value > BH1770_PROX_RANGE)
939                 return -EINVAL;
940
941         chip->prox_abs_thres = value;
942
943         return len;
944 }
945
946 static ssize_t bh1770_chip_id_show(struct device *dev,
947                                    struct device_attribute *attr, char *buf)
948 {
949         struct bh1770_chip *chip =  dev_get_drvdata(dev);
950         return sprintf(buf, "%s rev %d\n", chip->chipname, chip->revision);
951 }
952
953 static ssize_t bh1770_lux_calib_default_show(struct device *dev,
954                                  struct device_attribute *attr, char *buf)
955 {
956         return sprintf(buf, "%u\n", BH1770_CALIB_SCALER);
957 }
958
959 static ssize_t bh1770_lux_calib_show(struct device *dev,
960                                  struct device_attribute *attr, char *buf)
961 {
962         struct bh1770_chip *chip = dev_get_drvdata(dev);
963         ssize_t len;
964
965         mutex_lock(&chip->mutex);
966         len = sprintf(buf, "%u\n", chip->lux_calib);
967         mutex_unlock(&chip->mutex);
968         return len;
969 }
970
971 static ssize_t bh1770_lux_calib_store(struct device *dev,
972                                   struct device_attribute *attr,
973                                   const char *buf, size_t len)
974 {
975         struct bh1770_chip *chip = dev_get_drvdata(dev);
976         unsigned long value;
977         u32 old_calib;
978         u32 new_corr;
979         int ret;
980
981         ret = kstrtoul(buf, 0, &value);
982         if (ret)
983                 return ret;
984
985         mutex_lock(&chip->mutex);
986         old_calib = chip->lux_calib;
987         chip->lux_calib = value;
988         new_corr = bh1770_get_corr_value(chip);
989         if (new_corr == 0) {
990                 chip->lux_calib = old_calib;
991                 mutex_unlock(&chip->mutex);
992                 return -EINVAL;
993         }
994         chip->lux_corr = new_corr;
995         /* Refresh thresholds on HW after changing correction value */
996         bh1770_lux_update_thresholds(chip, chip->lux_threshold_hi,
997                                 chip->lux_threshold_lo);
998
999         mutex_unlock(&chip->mutex);
1000
1001         return len;
1002 }
1003
1004 static ssize_t bh1770_get_lux_rate_avail(struct device *dev,
1005                                    struct device_attribute *attr, char *buf)
1006 {
1007         int i;
1008         int pos = 0;
1009         for (i = 0; i < ARRAY_SIZE(lux_rates_hz); i++)
1010                 pos += sprintf(buf + pos, "%d ", lux_rates_hz[i]);
1011         sprintf(buf + pos - 1, "\n");
1012         return pos;
1013 }
1014
1015 static ssize_t bh1770_get_lux_rate(struct device *dev,
1016                                    struct device_attribute *attr, char *buf)
1017 {
1018         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1019         return sprintf(buf, "%d\n", lux_rates_hz[chip->lux_rate_index]);
1020 }
1021
1022 static ssize_t bh1770_set_lux_rate(struct device *dev,
1023                                       struct device_attribute *attr,
1024                                       const char *buf, size_t count)
1025 {
1026         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1027         unsigned long rate_hz;
1028         int ret, i;
1029
1030         ret = kstrtoul(buf, 0, &rate_hz);
1031         if (ret)
1032                 return ret;
1033
1034         for (i = 0; i < ARRAY_SIZE(lux_rates_hz) - 1; i++)
1035                 if (rate_hz >= lux_rates_hz[i])
1036                         break;
1037
1038         mutex_lock(&chip->mutex);
1039         chip->lux_rate_index = i;
1040         ret = bh1770_lux_rate(chip, i);
1041         mutex_unlock(&chip->mutex);
1042
1043         if (ret < 0)
1044                 return ret;
1045
1046         return count;
1047 }
1048
1049 static ssize_t bh1770_get_lux_thresh_above(struct device *dev,
1050                                    struct device_attribute *attr, char *buf)
1051 {
1052         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1053         return sprintf(buf, "%d\n", chip->lux_threshold_hi);
1054 }
1055
1056 static ssize_t bh1770_get_lux_thresh_below(struct device *dev,
1057                                    struct device_attribute *attr, char *buf)
1058 {
1059         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1060         return sprintf(buf, "%d\n", chip->lux_threshold_lo);
1061 }
1062
1063 static ssize_t bh1770_set_lux_thresh(struct bh1770_chip *chip, u16 *target,
1064                                 const char *buf)
1065 {
1066         unsigned long thresh;
1067         int ret;
1068
1069         ret = kstrtoul(buf, 0, &thresh);
1070         if (ret)
1071                 return ret;
1072
1073         if (thresh > BH1770_LUX_RANGE)
1074                 return -EINVAL;
1075
1076         mutex_lock(&chip->mutex);
1077         *target = thresh;
1078         /*
1079          * Don't update values in HW if we are still waiting for
1080          * first interrupt to come after device handle open call.
1081          */
1082         if (!chip->lux_wait_result)
1083                 ret = bh1770_lux_update_thresholds(chip,
1084                                                 chip->lux_threshold_hi,
1085                                                 chip->lux_threshold_lo);
1086         mutex_unlock(&chip->mutex);
1087         return ret;
1088
1089 }
1090
1091 static ssize_t bh1770_set_lux_thresh_above(struct device *dev,
1092                                   struct device_attribute *attr,
1093                                   const char *buf, size_t len)
1094 {
1095         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1096         int ret = bh1770_set_lux_thresh(chip, &chip->lux_threshold_hi, buf);
1097         if (ret < 0)
1098                 return ret;
1099         return len;
1100 }
1101
1102 static ssize_t bh1770_set_lux_thresh_below(struct device *dev,
1103                                   struct device_attribute *attr,
1104                                   const char *buf, size_t len)
1105 {
1106         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1107         int ret = bh1770_set_lux_thresh(chip, &chip->lux_threshold_lo, buf);
1108         if (ret < 0)
1109                 return ret;
1110         return len;
1111 }
1112
1113 static DEVICE_ATTR(prox0_raw_en, S_IRUGO | S_IWUSR, bh1770_prox_enable_show,
1114                                                 bh1770_prox_enable_store);
1115 static DEVICE_ATTR(prox0_thresh_above1_value, S_IRUGO | S_IWUSR,
1116                                                 bh1770_prox_abs_thres_show,
1117                                                 bh1770_prox_abs_thres_store);
1118 static DEVICE_ATTR(prox0_thresh_above0_value, S_IRUGO | S_IWUSR,
1119                                                 bh1770_get_prox_thres,
1120                                                 bh1770_set_prox_thres);
1121 static DEVICE_ATTR(prox0_raw, S_IRUGO, bh1770_prox_result_show, NULL);
1122 static DEVICE_ATTR(prox0_sensor_range, S_IRUGO, bh1770_prox_range_show, NULL);
1123 static DEVICE_ATTR(prox0_thresh_above_count, S_IRUGO | S_IWUSR,
1124                                                 bh1770_prox_persistence_show,
1125                                                 bh1770_prox_persistence_store);
1126 static DEVICE_ATTR(prox0_rate_above, S_IRUGO | S_IWUSR,
1127                                                 bh1770_get_prox_rate_above,
1128                                                 bh1770_set_prox_rate_above);
1129 static DEVICE_ATTR(prox0_rate_below, S_IRUGO | S_IWUSR,
1130                                                 bh1770_get_prox_rate_below,
1131                                                 bh1770_set_prox_rate_below);
1132 static DEVICE_ATTR(prox0_rate_avail, S_IRUGO, bh1770_get_prox_rate_avail, NULL);
1133
1134 static DEVICE_ATTR(lux0_calibscale, S_IRUGO | S_IWUSR, bh1770_lux_calib_show,
1135                                                 bh1770_lux_calib_store);
1136 static DEVICE_ATTR(lux0_calibscale_default, S_IRUGO,
1137                                                 bh1770_lux_calib_default_show,
1138                                                 NULL);
1139 static DEVICE_ATTR(lux0_input, S_IRUGO, bh1770_lux_result_show, NULL);
1140 static DEVICE_ATTR(lux0_sensor_range, S_IRUGO, bh1770_lux_range_show, NULL);
1141 static DEVICE_ATTR(lux0_rate, S_IRUGO | S_IWUSR, bh1770_get_lux_rate,
1142                                                 bh1770_set_lux_rate);
1143 static DEVICE_ATTR(lux0_rate_avail, S_IRUGO, bh1770_get_lux_rate_avail, NULL);
1144 static DEVICE_ATTR(lux0_thresh_above_value, S_IRUGO | S_IWUSR,
1145                                                 bh1770_get_lux_thresh_above,
1146                                                 bh1770_set_lux_thresh_above);
1147 static DEVICE_ATTR(lux0_thresh_below_value, S_IRUGO | S_IWUSR,
1148                                                 bh1770_get_lux_thresh_below,
1149                                                 bh1770_set_lux_thresh_below);
1150 static DEVICE_ATTR(chip_id, S_IRUGO, bh1770_chip_id_show, NULL);
1151 static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR, bh1770_power_state_show,
1152                                                  bh1770_power_state_store);
1153
1154
1155 static struct attribute *sysfs_attrs[] = {
1156         &dev_attr_lux0_calibscale.attr,
1157         &dev_attr_lux0_calibscale_default.attr,
1158         &dev_attr_lux0_input.attr,
1159         &dev_attr_lux0_sensor_range.attr,
1160         &dev_attr_lux0_rate.attr,
1161         &dev_attr_lux0_rate_avail.attr,
1162         &dev_attr_lux0_thresh_above_value.attr,
1163         &dev_attr_lux0_thresh_below_value.attr,
1164         &dev_attr_prox0_raw.attr,
1165         &dev_attr_prox0_sensor_range.attr,
1166         &dev_attr_prox0_raw_en.attr,
1167         &dev_attr_prox0_thresh_above_count.attr,
1168         &dev_attr_prox0_rate_above.attr,
1169         &dev_attr_prox0_rate_below.attr,
1170         &dev_attr_prox0_rate_avail.attr,
1171         &dev_attr_prox0_thresh_above0_value.attr,
1172         &dev_attr_prox0_thresh_above1_value.attr,
1173         &dev_attr_chip_id.attr,
1174         &dev_attr_power_state.attr,
1175         NULL
1176 };
1177
1178 static struct attribute_group bh1770_attribute_group = {
1179         .attrs = sysfs_attrs
1180 };
1181
1182 static int bh1770_probe(struct i2c_client *client,
1183                                 const struct i2c_device_id *id)
1184 {
1185         struct bh1770_chip *chip;
1186         int err;
1187
1188         chip = devm_kzalloc(&client->dev, sizeof *chip, GFP_KERNEL);
1189         if (!chip)
1190                 return -ENOMEM;
1191
1192         i2c_set_clientdata(client, chip);
1193         chip->client  = client;
1194
1195         mutex_init(&chip->mutex);
1196         init_waitqueue_head(&chip->wait);
1197         INIT_DELAYED_WORK(&chip->prox_work, bh1770_prox_work);
1198
1199         if (client->dev.platform_data == NULL) {
1200                 dev_err(&client->dev, "platform data is mandatory\n");
1201                 return -EINVAL;
1202         }
1203
1204         chip->pdata             = client->dev.platform_data;
1205         chip->lux_calib         = BH1770_LUX_NEUTRAL_CALIB_VALUE;
1206         chip->lux_rate_index    = BH1770_LUX_DEFAULT_RATE;
1207         chip->lux_threshold_lo  = BH1770_LUX_DEF_THRES;
1208         chip->lux_threshold_hi  = BH1770_LUX_DEF_THRES;
1209
1210         if (chip->pdata->glass_attenuation == 0)
1211                 chip->lux_ga = BH1770_NEUTRAL_GA;
1212         else
1213                 chip->lux_ga = chip->pdata->glass_attenuation;
1214
1215         chip->prox_threshold    = BH1770_PROX_DEF_THRES;
1216         chip->prox_led          = chip->pdata->led_def_curr;
1217         chip->prox_abs_thres    = BH1770_PROX_DEF_ABS_THRES;
1218         chip->prox_persistence  = BH1770_DEFAULT_PERSISTENCE;
1219         chip->prox_rate_threshold = BH1770_PROX_DEF_RATE_THRESH;
1220         chip->prox_rate         = BH1770_PROX_DEFAULT_RATE;
1221         chip->prox_data         = 0;
1222
1223         chip->regs[0].supply = reg_vcc;
1224         chip->regs[1].supply = reg_vleds;
1225
1226         err = devm_regulator_bulk_get(&client->dev,
1227                                       ARRAY_SIZE(chip->regs), chip->regs);
1228         if (err < 0) {
1229                 dev_err(&client->dev, "Cannot get regulators\n");
1230                 return err;
1231         }
1232
1233         err = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
1234                                 chip->regs);
1235         if (err < 0) {
1236                 dev_err(&client->dev, "Cannot enable regulators\n");
1237                 return err;
1238         }
1239
1240         usleep_range(BH1770_STARTUP_DELAY, BH1770_STARTUP_DELAY * 2);
1241         err = bh1770_detect(chip);
1242         if (err < 0)
1243                 goto fail0;
1244
1245         /* Start chip */
1246         bh1770_chip_on(chip);
1247         pm_runtime_set_active(&client->dev);
1248         pm_runtime_enable(&client->dev);
1249
1250         chip->lux_corr = bh1770_get_corr_value(chip);
1251         if (chip->lux_corr == 0) {
1252                 dev_err(&client->dev, "Improper correction values\n");
1253                 err = -EINVAL;
1254                 goto fail0;
1255         }
1256
1257         if (chip->pdata->setup_resources) {
1258                 err = chip->pdata->setup_resources();
1259                 if (err) {
1260                         err = -EINVAL;
1261                         goto fail0;
1262                 }
1263         }
1264
1265         err = sysfs_create_group(&chip->client->dev.kobj,
1266                                 &bh1770_attribute_group);
1267         if (err < 0) {
1268                 dev_err(&chip->client->dev, "Sysfs registration failed\n");
1269                 goto fail1;
1270         }
1271
1272         /*
1273          * Chip needs level triggered interrupt to work. However,
1274          * level triggering doesn't work always correctly with power
1275          * management. Select both
1276          */
1277         err = request_threaded_irq(client->irq, NULL,
1278                                 bh1770_irq,
1279                                 IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
1280                                 IRQF_TRIGGER_LOW,
1281                                 "bh1770", chip);
1282         if (err) {
1283                 dev_err(&client->dev, "could not get IRQ %d\n",
1284                         client->irq);
1285                 goto fail2;
1286         }
1287         regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
1288         return err;
1289 fail2:
1290         sysfs_remove_group(&chip->client->dev.kobj,
1291                         &bh1770_attribute_group);
1292 fail1:
1293         if (chip->pdata->release_resources)
1294                 chip->pdata->release_resources();
1295 fail0:
1296         regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
1297         return err;
1298 }
1299
1300 static int bh1770_remove(struct i2c_client *client)
1301 {
1302         struct bh1770_chip *chip = i2c_get_clientdata(client);
1303
1304         free_irq(client->irq, chip);
1305
1306         sysfs_remove_group(&chip->client->dev.kobj,
1307                         &bh1770_attribute_group);
1308
1309         if (chip->pdata->release_resources)
1310                 chip->pdata->release_resources();
1311
1312         cancel_delayed_work_sync(&chip->prox_work);
1313
1314         if (!pm_runtime_suspended(&client->dev))
1315                 bh1770_chip_off(chip);
1316
1317         pm_runtime_disable(&client->dev);
1318         pm_runtime_set_suspended(&client->dev);
1319
1320         return 0;
1321 }
1322
1323 #ifdef CONFIG_PM_SLEEP
1324 static int bh1770_suspend(struct device *dev)
1325 {
1326         struct i2c_client *client = to_i2c_client(dev);
1327         struct bh1770_chip *chip = i2c_get_clientdata(client);
1328
1329         bh1770_chip_off(chip);
1330
1331         return 0;
1332 }
1333
1334 static int bh1770_resume(struct device *dev)
1335 {
1336         struct i2c_client *client = to_i2c_client(dev);
1337         struct bh1770_chip *chip = i2c_get_clientdata(client);
1338         int ret = 0;
1339
1340         bh1770_chip_on(chip);
1341
1342         if (!pm_runtime_suspended(dev)) {
1343                 /*
1344                  * If we were enabled at suspend time, it is expected
1345                  * everything works nice and smoothly
1346                  */
1347                 ret = bh1770_lux_rate(chip, chip->lux_rate_index);
1348                 ret |= bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
1349
1350                 /* This causes interrupt after the next measurement cycle */
1351                 bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
1352                                         BH1770_LUX_DEF_THRES);
1353                 /* Inform that we are waiting for a result from ALS */
1354                 chip->lux_wait_result = true;
1355                 bh1770_prox_mode_control(chip);
1356         }
1357         return ret;
1358 }
1359 #endif
1360
1361 #ifdef CONFIG_PM
1362 static int bh1770_runtime_suspend(struct device *dev)
1363 {
1364         struct i2c_client *client = to_i2c_client(dev);
1365         struct bh1770_chip *chip = i2c_get_clientdata(client);
1366
1367         bh1770_chip_off(chip);
1368
1369         return 0;
1370 }
1371
1372 static int bh1770_runtime_resume(struct device *dev)
1373 {
1374         struct i2c_client *client = to_i2c_client(dev);
1375         struct bh1770_chip *chip = i2c_get_clientdata(client);
1376
1377         bh1770_chip_on(chip);
1378
1379         return 0;
1380 }
1381 #endif
1382
1383 static const struct i2c_device_id bh1770_id[] = {
1384         {"bh1770glc", 0 },
1385         {"sfh7770", 0 },
1386         {}
1387 };
1388
1389 MODULE_DEVICE_TABLE(i2c, bh1770_id);
1390
1391 static const struct dev_pm_ops bh1770_pm_ops = {
1392         SET_SYSTEM_SLEEP_PM_OPS(bh1770_suspend, bh1770_resume)
1393         SET_RUNTIME_PM_OPS(bh1770_runtime_suspend, bh1770_runtime_resume, NULL)
1394 };
1395
1396 static struct i2c_driver bh1770_driver = {
1397         .driver  = {
1398                 .name   = "bh1770glc",
1399                 .pm     = &bh1770_pm_ops,
1400         },
1401         .probe    = bh1770_probe,
1402         .remove   = bh1770_remove,
1403         .id_table = bh1770_id,
1404 };
1405
1406 module_i2c_driver(bh1770_driver);
1407
1408 MODULE_DESCRIPTION("BH1770GLC / SFH7770 combined ALS and proximity sensor");
1409 MODULE_AUTHOR("Samu Onkalo, Nokia Corporation");
1410 MODULE_LICENSE("GPL v2");