cee632e645e1982fee9e99ef84e065daf0d17d39
[linux-2.6.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         size_t ret;
653
654         if (strict_strtoul(buf, 0, &value))
655                 return -EINVAL;
656
657         mutex_lock(&chip->mutex);
658         if (value) {
659                 pm_runtime_get_sync(dev);
660
661                 ret = bh1770_lux_rate(chip, chip->lux_rate_index);
662                 ret |= bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
663
664                 if (ret < 0) {
665                         pm_runtime_put(dev);
666                         goto leave;
667                 }
668
669                 /* This causes interrupt after the next measurement cycle */
670                 bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
671                                         BH1770_LUX_DEF_THRES);
672                 /* Inform that we are waiting for a result from ALS */
673                 chip->lux_wait_result = true;
674                 bh1770_prox_mode_control(chip);
675         } else if (!pm_runtime_suspended(dev)) {
676                 pm_runtime_put(dev);
677         }
678         ret = count;
679 leave:
680         mutex_unlock(&chip->mutex);
681         return ret;
682 }
683
684 static ssize_t bh1770_power_state_show(struct device *dev,
685                                    struct device_attribute *attr, char *buf)
686 {
687         return sprintf(buf, "%d\n", !pm_runtime_suspended(dev));
688 }
689
690 static ssize_t bh1770_lux_result_show(struct device *dev,
691                                    struct device_attribute *attr, char *buf)
692 {
693         struct bh1770_chip *chip =  dev_get_drvdata(dev);
694         ssize_t ret;
695         long timeout;
696
697         if (pm_runtime_suspended(dev))
698                 return -EIO; /* Chip is not enabled at all */
699
700         timeout = wait_event_interruptible_timeout(chip->wait,
701                                         !chip->lux_wait_result,
702                                         msecs_to_jiffies(BH1770_TIMEOUT));
703         if (!timeout)
704                 return -EIO;
705
706         mutex_lock(&chip->mutex);
707         ret = sprintf(buf, "%d\n", bh1770_lux_read_result(chip));
708         mutex_unlock(&chip->mutex);
709
710         return ret;
711 }
712
713 static ssize_t bh1770_lux_range_show(struct device *dev,
714                                    struct device_attribute *attr, char *buf)
715 {
716         return sprintf(buf, "%d\n", BH1770_LUX_RANGE);
717 }
718
719 static ssize_t bh1770_prox_enable_store(struct device *dev,
720                                       struct device_attribute *attr,
721                                       const char *buf, size_t count)
722 {
723         struct bh1770_chip *chip =  dev_get_drvdata(dev);
724         unsigned long value;
725
726         if (strict_strtoul(buf, 0, &value))
727                 return -EINVAL;
728
729         mutex_lock(&chip->mutex);
730         /* Assume no proximity. Sensor will tell real state soon */
731         if (!chip->prox_enable_count)
732                 chip->prox_data = 0;
733
734         if (value)
735                 chip->prox_enable_count++;
736         else if (chip->prox_enable_count > 0)
737                 chip->prox_enable_count--;
738         else
739                 goto leave;
740
741         /* Run control only when chip is powered on */
742         if (!pm_runtime_suspended(dev))
743                 bh1770_prox_mode_control(chip);
744 leave:
745         mutex_unlock(&chip->mutex);
746         return count;
747 }
748
749 static ssize_t bh1770_prox_enable_show(struct device *dev,
750                                    struct device_attribute *attr, char *buf)
751 {
752         struct bh1770_chip *chip =  dev_get_drvdata(dev);
753         ssize_t len;
754
755         mutex_lock(&chip->mutex);
756         len = sprintf(buf, "%d\n", chip->prox_enable_count);
757         mutex_unlock(&chip->mutex);
758         return len;
759 }
760
761 static ssize_t bh1770_prox_result_show(struct device *dev,
762                                    struct device_attribute *attr, char *buf)
763 {
764         struct bh1770_chip *chip =  dev_get_drvdata(dev);
765         ssize_t ret;
766
767         mutex_lock(&chip->mutex);
768         if (chip->prox_enable_count && !pm_runtime_suspended(dev))
769                 ret = sprintf(buf, "%d\n", chip->prox_data);
770         else
771                 ret = -EIO;
772         mutex_unlock(&chip->mutex);
773         return ret;
774 }
775
776 static ssize_t bh1770_prox_range_show(struct device *dev,
777                                    struct device_attribute *attr, char *buf)
778 {
779         return sprintf(buf, "%d\n", BH1770_PROX_RANGE);
780 }
781
782 static ssize_t bh1770_get_prox_rate_avail(struct device *dev,
783                                    struct device_attribute *attr, char *buf)
784 {
785         int i;
786         int pos = 0;
787         for (i = 0; i < ARRAY_SIZE(prox_rates_hz); i++)
788                 pos += sprintf(buf + pos, "%d ", prox_rates_hz[i]);
789         sprintf(buf + pos - 1, "\n");
790         return pos;
791 }
792
793 static ssize_t bh1770_get_prox_rate_above(struct device *dev,
794                                    struct device_attribute *attr, char *buf)
795 {
796         struct bh1770_chip *chip =  dev_get_drvdata(dev);
797         return sprintf(buf, "%d\n", prox_rates_hz[chip->prox_rate_threshold]);
798 }
799
800 static ssize_t bh1770_get_prox_rate_below(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]);
805 }
806
807 static int bh1770_prox_rate_validate(int rate)
808 {
809         int i;
810
811         for (i = 0; i < ARRAY_SIZE(prox_rates_hz) - 1; i++)
812                 if (rate >= prox_rates_hz[i])
813                         break;
814         return i;
815 }
816
817 static ssize_t bh1770_set_prox_rate_above(struct device *dev,
818                                         struct device_attribute *attr,
819                                         const char *buf, size_t count)
820 {
821         struct bh1770_chip *chip =  dev_get_drvdata(dev);
822         unsigned long value;
823
824         if (strict_strtoul(buf, 0, &value))
825                 return -EINVAL;
826
827         mutex_lock(&chip->mutex);
828         chip->prox_rate_threshold = bh1770_prox_rate_validate(value);
829         mutex_unlock(&chip->mutex);
830         return count;
831 }
832
833 static ssize_t bh1770_set_prox_rate_below(struct device *dev,
834                                         struct device_attribute *attr,
835                                         const char *buf, size_t count)
836 {
837         struct bh1770_chip *chip =  dev_get_drvdata(dev);
838         unsigned long value;
839
840         if (strict_strtoul(buf, 0, &value))
841                 return -EINVAL;
842
843         mutex_lock(&chip->mutex);
844         chip->prox_rate = bh1770_prox_rate_validate(value);
845         mutex_unlock(&chip->mutex);
846         return count;
847 }
848
849 static ssize_t bh1770_get_prox_thres(struct device *dev,
850                                    struct device_attribute *attr, char *buf)
851 {
852         struct bh1770_chip *chip =  dev_get_drvdata(dev);
853         return sprintf(buf, "%d\n", chip->prox_threshold);
854 }
855
856 static ssize_t bh1770_set_prox_thres(struct device *dev,
857                                       struct device_attribute *attr,
858                                       const char *buf, size_t count)
859 {
860         struct bh1770_chip *chip =  dev_get_drvdata(dev);
861         unsigned long value;
862         int ret;
863
864         if (strict_strtoul(buf, 0, &value))
865                 return -EINVAL;
866         if (value > BH1770_PROX_RANGE)
867                 return -EINVAL;
868
869         mutex_lock(&chip->mutex);
870         chip->prox_threshold = value;
871         ret = bh1770_prox_set_threshold(chip);
872         mutex_unlock(&chip->mutex);
873         if (ret < 0)
874                 return ret;
875         return count;
876 }
877
878 static ssize_t bh1770_prox_persistence_show(struct device *dev,
879                                  struct device_attribute *attr, char *buf)
880 {
881         struct bh1770_chip *chip = dev_get_drvdata(dev);
882
883         return sprintf(buf, "%u\n", chip->prox_persistence);
884 }
885
886 static ssize_t bh1770_prox_persistence_store(struct device *dev,
887                                 struct device_attribute *attr,
888                                 const char *buf, size_t len)
889 {
890         struct bh1770_chip *chip = dev_get_drvdata(dev);
891         unsigned long value;
892
893         if (strict_strtoul(buf, 0, &value))
894                 return -EINVAL;
895
896         if (value > BH1770_PROX_MAX_PERSISTENCE)
897                 return -EINVAL;
898
899         chip->prox_persistence = value;
900
901         return len;
902 }
903
904 static ssize_t bh1770_prox_abs_thres_show(struct device *dev,
905                                  struct device_attribute *attr, char *buf)
906 {
907         struct bh1770_chip *chip = dev_get_drvdata(dev);
908         return sprintf(buf, "%u\n", chip->prox_abs_thres);
909 }
910
911 static ssize_t bh1770_prox_abs_thres_store(struct device *dev,
912                                 struct device_attribute *attr,
913                                 const char *buf, size_t len)
914 {
915         struct bh1770_chip *chip = dev_get_drvdata(dev);
916         unsigned long value;
917
918         if (strict_strtoul(buf, 0, &value))
919                 return -EINVAL;
920
921         if (value > BH1770_PROX_RANGE)
922                 return -EINVAL;
923
924         chip->prox_abs_thres = value;
925
926         return len;
927 }
928
929 static ssize_t bh1770_chip_id_show(struct device *dev,
930                                    struct device_attribute *attr, char *buf)
931 {
932         struct bh1770_chip *chip =  dev_get_drvdata(dev);
933         return sprintf(buf, "%s rev %d\n", chip->chipname, chip->revision);
934 }
935
936 static ssize_t bh1770_lux_calib_default_show(struct device *dev,
937                                  struct device_attribute *attr, char *buf)
938 {
939         return sprintf(buf, "%u\n", BH1770_CALIB_SCALER);
940 }
941
942 static ssize_t bh1770_lux_calib_show(struct device *dev,
943                                  struct device_attribute *attr, char *buf)
944 {
945         struct bh1770_chip *chip = dev_get_drvdata(dev);
946         ssize_t len;
947
948         mutex_lock(&chip->mutex);
949         len = sprintf(buf, "%u\n", chip->lux_calib);
950         mutex_unlock(&chip->mutex);
951         return len;
952 }
953
954 static ssize_t bh1770_lux_calib_store(struct device *dev,
955                                   struct device_attribute *attr,
956                                   const char *buf, size_t len)
957 {
958         struct bh1770_chip *chip = dev_get_drvdata(dev);
959         unsigned long value;
960         u32 old_calib;
961         u32 new_corr;
962
963         if (strict_strtoul(buf, 0, &value))
964                 return -EINVAL;
965
966         mutex_lock(&chip->mutex);
967         old_calib = chip->lux_calib;
968         chip->lux_calib = value;
969         new_corr = bh1770_get_corr_value(chip);
970         if (new_corr == 0) {
971                 chip->lux_calib = old_calib;
972                 mutex_unlock(&chip->mutex);
973                 return -EINVAL;
974         }
975         chip->lux_corr = new_corr;
976         /* Refresh thresholds on HW after changing correction value */
977         bh1770_lux_update_thresholds(chip, chip->lux_threshold_hi,
978                                 chip->lux_threshold_lo);
979
980         mutex_unlock(&chip->mutex);
981
982         return len;
983 }
984
985 static ssize_t bh1770_get_lux_rate_avail(struct device *dev,
986                                    struct device_attribute *attr, char *buf)
987 {
988         int i;
989         int pos = 0;
990         for (i = 0; i < ARRAY_SIZE(lux_rates_hz); i++)
991                 pos += sprintf(buf + pos, "%d ", lux_rates_hz[i]);
992         sprintf(buf + pos - 1, "\n");
993         return pos;
994 }
995
996 static ssize_t bh1770_get_lux_rate(struct device *dev,
997                                    struct device_attribute *attr, char *buf)
998 {
999         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1000         return sprintf(buf, "%d\n", lux_rates_hz[chip->lux_rate_index]);
1001 }
1002
1003 static ssize_t bh1770_set_lux_rate(struct device *dev,
1004                                       struct device_attribute *attr,
1005                                       const char *buf, size_t count)
1006 {
1007         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1008         unsigned long rate_hz;
1009         int ret, i;
1010
1011         if (strict_strtoul(buf, 0, &rate_hz))
1012                 return -EINVAL;
1013
1014         for (i = 0; i < ARRAY_SIZE(lux_rates_hz) - 1; i++)
1015                 if (rate_hz >= lux_rates_hz[i])
1016                         break;
1017
1018         mutex_lock(&chip->mutex);
1019         chip->lux_rate_index = i;
1020         ret = bh1770_lux_rate(chip, i);
1021         mutex_unlock(&chip->mutex);
1022
1023         if (ret < 0)
1024                 return ret;
1025
1026         return count;
1027 }
1028
1029 static ssize_t bh1770_get_lux_thresh_above(struct device *dev,
1030                                    struct device_attribute *attr, char *buf)
1031 {
1032         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1033         return sprintf(buf, "%d\n", chip->lux_threshold_hi);
1034 }
1035
1036 static ssize_t bh1770_get_lux_thresh_below(struct device *dev,
1037                                    struct device_attribute *attr, char *buf)
1038 {
1039         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1040         return sprintf(buf, "%d\n", chip->lux_threshold_lo);
1041 }
1042
1043 static ssize_t bh1770_set_lux_thresh(struct bh1770_chip *chip, u16 *target,
1044                                 const char *buf)
1045 {
1046         int ret = 0;
1047         unsigned long thresh;
1048
1049         if (strict_strtoul(buf, 0, &thresh))
1050                 return -EINVAL;
1051
1052         if (thresh > BH1770_LUX_RANGE)
1053                 return -EINVAL;
1054
1055         mutex_lock(&chip->mutex);
1056         *target = thresh;
1057         /*
1058          * Don't update values in HW if we are still waiting for
1059          * first interrupt to come after device handle open call.
1060          */
1061         if (!chip->lux_wait_result)
1062                 ret = bh1770_lux_update_thresholds(chip,
1063                                                 chip->lux_threshold_hi,
1064                                                 chip->lux_threshold_lo);
1065         mutex_unlock(&chip->mutex);
1066         return ret;
1067
1068 }
1069
1070 static ssize_t bh1770_set_lux_thresh_above(struct device *dev,
1071                                   struct device_attribute *attr,
1072                                   const char *buf, size_t len)
1073 {
1074         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1075         int ret = bh1770_set_lux_thresh(chip, &chip->lux_threshold_hi, buf);
1076         if (ret < 0)
1077                 return ret;
1078         return len;
1079 }
1080
1081 static ssize_t bh1770_set_lux_thresh_below(struct device *dev,
1082                                   struct device_attribute *attr,
1083                                   const char *buf, size_t len)
1084 {
1085         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1086         int ret = bh1770_set_lux_thresh(chip, &chip->lux_threshold_lo, buf);
1087         if (ret < 0)
1088                 return ret;
1089         return len;
1090 }
1091
1092 static DEVICE_ATTR(prox0_raw_en, S_IRUGO | S_IWUSR, bh1770_prox_enable_show,
1093                                                 bh1770_prox_enable_store);
1094 static DEVICE_ATTR(prox0_thresh_above1_value, S_IRUGO | S_IWUSR,
1095                                                 bh1770_prox_abs_thres_show,
1096                                                 bh1770_prox_abs_thres_store);
1097 static DEVICE_ATTR(prox0_thresh_above0_value, S_IRUGO | S_IWUSR,
1098                                                 bh1770_get_prox_thres,
1099                                                 bh1770_set_prox_thres);
1100 static DEVICE_ATTR(prox0_raw, S_IRUGO, bh1770_prox_result_show, NULL);
1101 static DEVICE_ATTR(prox0_sensor_range, S_IRUGO, bh1770_prox_range_show, NULL);
1102 static DEVICE_ATTR(prox0_thresh_above_count, S_IRUGO | S_IWUSR,
1103                                                 bh1770_prox_persistence_show,
1104                                                 bh1770_prox_persistence_store);
1105 static DEVICE_ATTR(prox0_rate_above, S_IRUGO | S_IWUSR,
1106                                                 bh1770_get_prox_rate_above,
1107                                                 bh1770_set_prox_rate_above);
1108 static DEVICE_ATTR(prox0_rate_below, S_IRUGO | S_IWUSR,
1109                                                 bh1770_get_prox_rate_below,
1110                                                 bh1770_set_prox_rate_below);
1111 static DEVICE_ATTR(prox0_rate_avail, S_IRUGO, bh1770_get_prox_rate_avail, NULL);
1112
1113 static DEVICE_ATTR(lux0_calibscale, S_IRUGO | S_IWUSR, bh1770_lux_calib_show,
1114                                                 bh1770_lux_calib_store);
1115 static DEVICE_ATTR(lux0_calibscale_default, S_IRUGO,
1116                                                 bh1770_lux_calib_default_show,
1117                                                 NULL);
1118 static DEVICE_ATTR(lux0_input, S_IRUGO, bh1770_lux_result_show, NULL);
1119 static DEVICE_ATTR(lux0_sensor_range, S_IRUGO, bh1770_lux_range_show, NULL);
1120 static DEVICE_ATTR(lux0_rate, S_IRUGO | S_IWUSR, bh1770_get_lux_rate,
1121                                                 bh1770_set_lux_rate);
1122 static DEVICE_ATTR(lux0_rate_avail, S_IRUGO, bh1770_get_lux_rate_avail, NULL);
1123 static DEVICE_ATTR(lux0_thresh_above_value, S_IRUGO | S_IWUSR,
1124                                                 bh1770_get_lux_thresh_above,
1125                                                 bh1770_set_lux_thresh_above);
1126 static DEVICE_ATTR(lux0_thresh_below_value, S_IRUGO | S_IWUSR,
1127                                                 bh1770_get_lux_thresh_below,
1128                                                 bh1770_set_lux_thresh_below);
1129 static DEVICE_ATTR(chip_id, S_IRUGO, bh1770_chip_id_show, NULL);
1130 static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR, bh1770_power_state_show,
1131                                                  bh1770_power_state_store);
1132
1133
1134 static struct attribute *sysfs_attrs[] = {
1135         &dev_attr_lux0_calibscale.attr,
1136         &dev_attr_lux0_calibscale_default.attr,
1137         &dev_attr_lux0_input.attr,
1138         &dev_attr_lux0_sensor_range.attr,
1139         &dev_attr_lux0_rate.attr,
1140         &dev_attr_lux0_rate_avail.attr,
1141         &dev_attr_lux0_thresh_above_value.attr,
1142         &dev_attr_lux0_thresh_below_value.attr,
1143         &dev_attr_prox0_raw.attr,
1144         &dev_attr_prox0_sensor_range.attr,
1145         &dev_attr_prox0_raw_en.attr,
1146         &dev_attr_prox0_thresh_above_count.attr,
1147         &dev_attr_prox0_rate_above.attr,
1148         &dev_attr_prox0_rate_below.attr,
1149         &dev_attr_prox0_rate_avail.attr,
1150         &dev_attr_prox0_thresh_above0_value.attr,
1151         &dev_attr_prox0_thresh_above1_value.attr,
1152         &dev_attr_chip_id.attr,
1153         &dev_attr_power_state.attr,
1154         NULL
1155 };
1156
1157 static struct attribute_group bh1770_attribute_group = {
1158         .attrs = sysfs_attrs
1159 };
1160
1161 static int __devinit bh1770_probe(struct i2c_client *client,
1162                                 const struct i2c_device_id *id)
1163 {
1164         struct bh1770_chip *chip;
1165         int err;
1166
1167         chip = kzalloc(sizeof *chip, GFP_KERNEL);
1168         if (!chip)
1169                 return -ENOMEM;
1170
1171         i2c_set_clientdata(client, chip);
1172         chip->client  = client;
1173
1174         mutex_init(&chip->mutex);
1175         init_waitqueue_head(&chip->wait);
1176         INIT_DELAYED_WORK(&chip->prox_work, bh1770_prox_work);
1177
1178         if (client->dev.platform_data == NULL) {
1179                 dev_err(&client->dev, "platform data is mandatory\n");
1180                 err = -EINVAL;
1181                 goto fail1;
1182         }
1183
1184         chip->pdata             = client->dev.platform_data;
1185         chip->lux_calib         = BH1770_LUX_NEUTRAL_CALIB_VALUE;
1186         chip->lux_rate_index    = BH1770_LUX_DEFAULT_RATE;
1187         chip->lux_threshold_lo  = BH1770_LUX_DEF_THRES;
1188         chip->lux_threshold_hi  = BH1770_LUX_DEF_THRES;
1189
1190         if (chip->pdata->glass_attenuation == 0)
1191                 chip->lux_ga = BH1770_NEUTRAL_GA;
1192         else
1193                 chip->lux_ga = chip->pdata->glass_attenuation;
1194
1195         chip->prox_threshold    = BH1770_PROX_DEF_THRES;
1196         chip->prox_led          = chip->pdata->led_def_curr;
1197         chip->prox_abs_thres    = BH1770_PROX_DEF_ABS_THRES;
1198         chip->prox_persistence  = BH1770_DEFAULT_PERSISTENCE;
1199         chip->prox_rate_threshold = BH1770_PROX_DEF_RATE_THRESH;
1200         chip->prox_rate         = BH1770_PROX_DEFAULT_RATE;
1201         chip->prox_data         = 0;
1202
1203         chip->regs[0].supply = reg_vcc;
1204         chip->regs[1].supply = reg_vleds;
1205
1206         err = regulator_bulk_get(&client->dev,
1207                                  ARRAY_SIZE(chip->regs), chip->regs);
1208         if (err < 0) {
1209                 dev_err(&client->dev, "Cannot get regulators\n");
1210                 goto fail1;
1211         }
1212
1213         err = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
1214                                 chip->regs);
1215         if (err < 0) {
1216                 dev_err(&client->dev, "Cannot enable regulators\n");
1217                 goto fail2;
1218         }
1219
1220         usleep_range(BH1770_STARTUP_DELAY, BH1770_STARTUP_DELAY * 2);
1221         err = bh1770_detect(chip);
1222         if (err < 0)
1223                 goto fail3;
1224
1225         /* Start chip */
1226         bh1770_chip_on(chip);
1227         pm_runtime_set_active(&client->dev);
1228         pm_runtime_enable(&client->dev);
1229
1230         chip->lux_corr = bh1770_get_corr_value(chip);
1231         if (chip->lux_corr == 0) {
1232                 dev_err(&client->dev, "Improper correction values\n");
1233                 err = -EINVAL;
1234                 goto fail3;
1235         }
1236
1237         if (chip->pdata->setup_resources) {
1238                 err = chip->pdata->setup_resources();
1239                 if (err) {
1240                         err = -EINVAL;
1241                         goto fail3;
1242                 }
1243         }
1244
1245         err = sysfs_create_group(&chip->client->dev.kobj,
1246                                 &bh1770_attribute_group);
1247         if (err < 0) {
1248                 dev_err(&chip->client->dev, "Sysfs registration failed\n");
1249                 goto fail4;
1250         }
1251
1252         /*
1253          * Chip needs level triggered interrupt to work. However,
1254          * level triggering doesn't work always correctly with power
1255          * management. Select both
1256          */
1257         err = request_threaded_irq(client->irq, NULL,
1258                                 bh1770_irq,
1259                                 IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
1260                                 IRQF_TRIGGER_LOW,
1261                                 "bh1770", chip);
1262         if (err) {
1263                 dev_err(&client->dev, "could not get IRQ %d\n",
1264                         client->irq);
1265                 goto fail5;
1266         }
1267         regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
1268         return err;
1269 fail5:
1270         sysfs_remove_group(&chip->client->dev.kobj,
1271                         &bh1770_attribute_group);
1272 fail4:
1273         if (chip->pdata->release_resources)
1274                 chip->pdata->release_resources();
1275 fail3:
1276         regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
1277 fail2:
1278         regulator_bulk_free(ARRAY_SIZE(chip->regs), chip->regs);
1279 fail1:
1280         kfree(chip);
1281         return err;
1282 }
1283
1284 static int __devexit bh1770_remove(struct i2c_client *client)
1285 {
1286         struct bh1770_chip *chip = i2c_get_clientdata(client);
1287
1288         free_irq(client->irq, chip);
1289
1290         sysfs_remove_group(&chip->client->dev.kobj,
1291                         &bh1770_attribute_group);
1292
1293         if (chip->pdata->release_resources)
1294                 chip->pdata->release_resources();
1295
1296         cancel_delayed_work_sync(&chip->prox_work);
1297
1298         if (!pm_runtime_suspended(&client->dev))
1299                 bh1770_chip_off(chip);
1300
1301         pm_runtime_disable(&client->dev);
1302         pm_runtime_set_suspended(&client->dev);
1303
1304         regulator_bulk_free(ARRAY_SIZE(chip->regs), chip->regs);
1305         kfree(chip);
1306         return 0;
1307 }
1308
1309 #ifdef CONFIG_PM
1310 static int bh1770_suspend(struct device *dev)
1311 {
1312         struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1313         struct bh1770_chip *chip = i2c_get_clientdata(client);
1314
1315         bh1770_chip_off(chip);
1316
1317         return 0;
1318 }
1319
1320 static int bh1770_resume(struct device *dev)
1321 {
1322         struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1323         struct bh1770_chip *chip = i2c_get_clientdata(client);
1324         int ret = 0;
1325
1326         bh1770_chip_on(chip);
1327
1328         if (!pm_runtime_suspended(dev)) {
1329                 /*
1330                  * If we were enabled at suspend time, it is expected
1331                  * everything works nice and smoothly
1332                  */
1333                 ret = bh1770_lux_rate(chip, chip->lux_rate_index);
1334                 ret |= bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
1335
1336                 /* This causes interrupt after the next measurement cycle */
1337                 bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
1338                                         BH1770_LUX_DEF_THRES);
1339                 /* Inform that we are waiting for a result from ALS */
1340                 chip->lux_wait_result = true;
1341                 bh1770_prox_mode_control(chip);
1342         }
1343         return ret;
1344 }
1345
1346 #else
1347 #define bh1770_suspend  NULL
1348 #define bh1770_shutdown NULL
1349 #define bh1770_resume   NULL
1350 #endif
1351
1352 #ifdef CONFIG_PM_RUNTIME
1353 static int bh1770_runtime_suspend(struct device *dev)
1354 {
1355         struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1356         struct bh1770_chip *chip = i2c_get_clientdata(client);
1357
1358         bh1770_chip_off(chip);
1359
1360         return 0;
1361 }
1362
1363 static int bh1770_runtime_resume(struct device *dev)
1364 {
1365         struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1366         struct bh1770_chip *chip = i2c_get_clientdata(client);
1367
1368         bh1770_chip_on(chip);
1369
1370         return 0;
1371 }
1372 #endif
1373
1374 static const struct i2c_device_id bh1770_id[] = {
1375         {"bh1770glc", 0 },
1376         {"sfh7770", 0 },
1377         {}
1378 };
1379
1380 MODULE_DEVICE_TABLE(i2c, bh1770_id);
1381
1382 static const struct dev_pm_ops bh1770_pm_ops = {
1383         SET_SYSTEM_SLEEP_PM_OPS(bh1770_suspend, bh1770_resume)
1384         SET_RUNTIME_PM_OPS(bh1770_runtime_suspend, bh1770_runtime_resume, NULL)
1385 };
1386
1387 static struct i2c_driver bh1770_driver = {
1388         .driver  = {
1389                 .name   = "bh1770glc",
1390                 .owner  = THIS_MODULE,
1391                 .pm     = &bh1770_pm_ops,
1392         },
1393         .probe    = bh1770_probe,
1394         .remove   = __devexit_p(bh1770_remove),
1395         .id_table = bh1770_id,
1396 };
1397
1398 static int __init bh1770_init(void)
1399 {
1400         return i2c_add_driver(&bh1770_driver);
1401 }
1402
1403 static void __exit bh1770_exit(void)
1404 {
1405         i2c_del_driver(&bh1770_driver);
1406 }
1407
1408 MODULE_DESCRIPTION("BH1770GLC / SFH7770 combined ALS and proximity sensor");
1409 MODULE_AUTHOR("Samu Onkalo, Nokia Corporation");
1410 MODULE_LICENSE("GPL v2");
1411
1412 module_init(bh1770_init);
1413 module_exit(bh1770_exit);