2
* This file is part of the ROHM BH1770GLC / OSRAM SFH7770 sensor driver.
3
* Chip is combined proximity and ambient light sensor.
5
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
7
* Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
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.
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.
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
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>
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 */
63
#define BH1770_MANUFACT_ROHM 0x01
64
#define BH1770_MANUFACT_OSRAM 0x03
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
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)
80
#define BH1770_PS_TRIG_MEAS (1 << 0)
81
#define BH1770_ALS_TRIG_MEAS (1 << 1)
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)
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)
101
#define BH1770_LED1 0x00
103
#define BH1770_DISABLE 0
104
#define BH1770_ENABLE 1
105
#define BH1770_PROX_CHANNELS 1
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 */
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
129
#define PROX_ABOVE_THRESHOLD 1
130
#define PROX_BELOW_THRESHOLD 0
132
#define PROX_IGNORE_LUX_LIMIT 500
135
struct bh1770_platform_data *pdata;
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;
145
struct delayed_work prox_work;
146
u32 lux_cf; /* Chip specific factor */
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;
158
int prox_enable_count;
162
int prox_rate_threshold;
164
u8 prox_persistence_counter;
167
u8 prox_threshold_hw;
168
bool prox_force_update;
173
static const char reg_vcc[] = "Vcc";
174
static const char reg_vleds[] = "Vleds";
177
* Supported stand alone rates in ms from chip data sheet
178
* {10, 20, 30, 40, 70, 100, 200, 500, 1000, 2000};
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};
183
/* Supported IR-led currents in mA */
184
static const u8 prox_curr_ma[] = {5, 10, 20, 50, 100, 150, 200};
187
* Supported stand alone rates in ms from chip data sheet
188
* {100, 200, 500, 1000, 2000};
190
static const s16 lux_rates_hz[] = {10, 5, 2, 1, 0};
193
* interrupt control functions are called while keeping chip->mutex
194
* excluding module probe / remove
196
static inline int bh1770_lux_interrupt_control(struct bh1770_chip *chip,
199
chip->int_mode_lux = lux;
200
/* Set interrupt modes, interrupt active low, latched */
201
return i2c_smbus_write_byte_data(chip->client,
203
(lux << 1) | chip->int_mode_prox);
206
static inline int bh1770_prox_interrupt_control(struct bh1770_chip *chip,
209
chip->int_mode_prox = ps;
210
return i2c_smbus_write_byte_data(chip->client,
212
(chip->int_mode_lux << 1) | (ps << 0));
215
/* chip->mutex is always kept here */
216
static int bh1770_lux_rate(struct bh1770_chip *chip, int rate_index)
218
/* sysfs may call this when the chip is powered off */
219
if (pm_runtime_suspended(&chip->client->dev))
222
/* Proper proximity response needs fastest lux rate (100ms) */
223
if (chip->prox_enable_count)
226
return i2c_smbus_write_byte_data(chip->client,
227
BH1770_ALS_MEAS_RATE,
231
static int bh1770_prox_rate(struct bh1770_chip *chip, int mode)
235
rate = (mode == PROX_ABOVE_THRESHOLD) ?
236
chip->prox_rate_threshold : chip->prox_rate;
238
return i2c_smbus_write_byte_data(chip->client,
243
/* InfraredLED is controlled by the chip during proximity scanning */
244
static inline int bh1770_led_cfg(struct bh1770_chip *chip)
246
/* LED cfg, current for leds 1 and 2 */
247
return i2c_smbus_write_byte_data(chip->client,
250
(BH1770_LED_5mA << 3) |
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
260
static inline u8 bh1770_psraw_to_adjusted(struct bh1770_chip *chip, u8 psraw)
263
adjusted = (u16)(((u32)(psraw + chip->prox_const) * chip->prox_coef) /
265
if (adjusted > BH1770_PROX_RANGE)
266
adjusted = BH1770_PROX_RANGE;
270
static inline u8 bh1770_psadjusted_to_raw(struct bh1770_chip *chip, u8 ps)
274
raw = (((u32)ps * BH1770_COEF_SCALER) / chip->prox_coef);
275
if (raw > chip->prox_const)
276
raw = raw - chip->prox_const;
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.
288
static int bh1770_prox_set_threshold(struct bh1770_chip *chip)
292
/* sysfs may call this when the chip is powered off */
293
if (pm_runtime_suspended(&chip->client->dev))
296
tmp = bh1770_psadjusted_to_raw(chip, chip->prox_threshold);
297
chip->prox_threshold_hw = tmp;
299
return i2c_smbus_write_byte_data(chip->client, BH1770_PS_TH_LED1,
303
static inline u16 bh1770_lux_raw_to_adjusted(struct bh1770_chip *chip, u16 raw)
306
lux = ((u32)raw * chip->lux_corr) / BH1770_LUX_CORR_SCALE;
307
return min(lux, (u32)BH1770_LUX_RANGE);
310
static inline u16 bh1770_lux_adjusted_to_raw(struct bh1770_chip *chip,
313
return (u32)adjusted * BH1770_LUX_CORR_SCALE / chip->lux_corr;
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)
323
/* sysfs may call this when the chip is powered off */
324
if (pm_runtime_suspended(&chip->client->dev))
328
* Compensate threshold values with the correction factors if not
329
* set to minimum or maximum.
330
* Min & max values disables interrupts.
332
if (threshold_hi != BH1770_LUX_RANGE && threshold_hi != 0)
333
threshold_hi = bh1770_lux_adjusted_to_raw(chip, threshold_hi);
335
if (threshold_lo != BH1770_LUX_RANGE && threshold_lo != 0)
336
threshold_lo = bh1770_lux_adjusted_to_raw(chip, threshold_lo);
338
if (chip->lux_thres_hi_onchip == threshold_hi &&
339
chip->lux_thres_lo_onchip == threshold_lo)
342
chip->lux_thres_hi_onchip = threshold_hi;
343
chip->lux_thres_lo_onchip = threshold_lo;
345
data[0] = threshold_hi;
346
data[1] = threshold_hi >> 8;
347
data[2] = threshold_lo;
348
data[3] = threshold_lo >> 8;
350
ret = i2c_smbus_write_i2c_block_data(chip->client,
357
static int bh1770_lux_get_result(struct bh1770_chip *chip)
362
ret = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_DATA_0);
367
ret = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_DATA_1);
371
chip->lux_data_raw = data | ((ret & 0xff) << 8);
376
/* Calculate correction value which contains chip and device specific parts */
377
static u32 bh1770_get_corr_value(struct bh1770_chip *chip)
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;
389
static int bh1770_lux_read_result(struct bh1770_chip *chip)
391
bh1770_lux_get_result(chip);
392
return bh1770_lux_raw_to_adjusted(chip, chip->lux_data_raw);
396
* Chip on / off functions are called while keeping mutex except probe
399
static int bh1770_chip_on(struct bh1770_chip *chip)
401
int ret = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
406
usleep_range(BH1770_STARTUP_DELAY, BH1770_STARTUP_DELAY * 2);
409
i2c_smbus_write_byte_data(chip->client, BH1770_ALS_CONTROL,
411
usleep_range(BH1770_RESET_TIME, BH1770_RESET_TIME * 2);
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.
418
chip->lux_data_raw = 0;
420
ret = i2c_smbus_write_byte_data(chip->client,
421
BH1770_ALS_CONTROL, BH1770_STANDALONE);
423
/* Assume reset defaults */
424
chip->lux_thres_hi_onchip = BH1770_LUX_RANGE;
425
chip->lux_thres_lo_onchip = 0;
430
static void bh1770_chip_off(struct bh1770_chip *chip)
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);
441
/* chip->mutex is kept when this is called */
442
static int bh1770_prox_mode_control(struct bh1770_chip *chip)
444
if (chip->prox_enable_count) {
445
chip->prox_force_update = true; /* Force immediate update */
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);
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);
464
/* chip->mutex is kept when this is called */
465
static int bh1770_prox_read_result(struct bh1770_chip *chip)
471
ret = i2c_smbus_read_byte_data(chip->client, BH1770_PS_DATA_LED1);
475
if (ret > chip->prox_threshold_hw)
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.
485
if (chip->lux_data_raw > PROX_IGNORE_LUX_LIMIT)
488
chip->prox_data = bh1770_psraw_to_adjusted(chip, ret);
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;
495
chip->prox_force_update = false;
497
/* Persistence filttering to reduce false proximity events */
499
if (chip->prox_persistence_counter < chip->prox_persistence) {
500
chip->prox_persistence_counter++;
503
mode = PROX_ABOVE_THRESHOLD;
507
chip->prox_persistence_counter = 0;
508
mode = PROX_BELOW_THRESHOLD;
513
/* Set proximity detection rate based on above or below value */
515
bh1770_prox_rate(chip, mode);
516
sysfs_notify(&chip->client->dev.kobj, NULL, "prox0_raw");
522
static int bh1770_detect(struct bh1770_chip *chip)
524
struct i2c_client *client = chip->client;
528
ret = i2c_smbus_read_byte_data(client, BH1770_MANUFACT_ID);
533
ret = i2c_smbus_read_byte_data(client, BH1770_PART_ID);
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;
543
if ((manu == BH1770_MANUFACT_ROHM) &&
544
((part & BH1770_PART_MASK) == BH1770_PART)) {
545
snprintf(chip->chipname, sizeof(chip->chipname), "BH1770GLC");
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;
560
dev_dbg(&client->dev, "BH1770 or SFH7770 not found\n");
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.
574
static void bh1770_prox_work(struct work_struct *work)
576
struct bh1770_chip *chip =
577
container_of(work, struct bh1770_chip, prox_work.work);
579
mutex_lock(&chip->mutex);
580
bh1770_prox_read_result(chip);
581
mutex_unlock(&chip->mutex);
584
/* This is threaded irq handler */
585
static irqreturn_t bh1770_irq(int irq, void *data)
587
struct bh1770_chip *chip = data;
591
mutex_lock(&chip->mutex);
592
status = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_PS_STATUS);
594
/* Acknowledge interrupt by reading this register */
595
i2c_smbus_read_byte_data(chip->client, BH1770_INTERRUPT);
598
* Check if there is fresh data available for als.
599
* If this is the very first data, update thresholds after that.
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);
612
/* Disable interrupt logic to guarantee acknowledgement */
613
i2c_smbus_write_byte_data(chip->client, BH1770_INTERRUPT,
614
(0 << 1) | (0 << 0));
616
if ((status & BH1770_INT_ALS_INT))
617
sysfs_notify(&chip->client->dev.kobj, NULL, "lux0_input");
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);
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);
631
* Can't cancel work while keeping mutex since the work uses the
636
* Simulate missing no-proximity interrupt 50ms after the
637
* next expected interrupt time.
639
cancel_delayed_work_sync(&chip->prox_work);
640
schedule_delayed_work(&chip->prox_work,
641
msecs_to_jiffies(rate + 50));
646
static ssize_t bh1770_power_state_store(struct device *dev,
647
struct device_attribute *attr,
648
const char *buf, size_t count)
650
struct bh1770_chip *chip = dev_get_drvdata(dev);
654
if (strict_strtoul(buf, 0, &value))
657
mutex_lock(&chip->mutex);
659
pm_runtime_get_sync(dev);
661
ret = bh1770_lux_rate(chip, chip->lux_rate_index);
667
ret = bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
673
/* This causes interrupt after the next measurement cycle */
674
bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
675
BH1770_LUX_DEF_THRES);
676
/* Inform that we are waiting for a result from ALS */
677
chip->lux_wait_result = true;
678
bh1770_prox_mode_control(chip);
679
} else if (!pm_runtime_suspended(dev)) {
684
mutex_unlock(&chip->mutex);
688
static ssize_t bh1770_power_state_show(struct device *dev,
689
struct device_attribute *attr, char *buf)
691
return sprintf(buf, "%d\n", !pm_runtime_suspended(dev));
694
static ssize_t bh1770_lux_result_show(struct device *dev,
695
struct device_attribute *attr, char *buf)
697
struct bh1770_chip *chip = dev_get_drvdata(dev);
701
if (pm_runtime_suspended(dev))
702
return -EIO; /* Chip is not enabled at all */
704
timeout = wait_event_interruptible_timeout(chip->wait,
705
!chip->lux_wait_result,
706
msecs_to_jiffies(BH1770_TIMEOUT));
710
mutex_lock(&chip->mutex);
711
ret = sprintf(buf, "%d\n", bh1770_lux_read_result(chip));
712
mutex_unlock(&chip->mutex);
717
static ssize_t bh1770_lux_range_show(struct device *dev,
718
struct device_attribute *attr, char *buf)
720
return sprintf(buf, "%d\n", BH1770_LUX_RANGE);
723
static ssize_t bh1770_prox_enable_store(struct device *dev,
724
struct device_attribute *attr,
725
const char *buf, size_t count)
727
struct bh1770_chip *chip = dev_get_drvdata(dev);
730
if (strict_strtoul(buf, 0, &value))
733
mutex_lock(&chip->mutex);
734
/* Assume no proximity. Sensor will tell real state soon */
735
if (!chip->prox_enable_count)
739
chip->prox_enable_count++;
740
else if (chip->prox_enable_count > 0)
741
chip->prox_enable_count--;
745
/* Run control only when chip is powered on */
746
if (!pm_runtime_suspended(dev))
747
bh1770_prox_mode_control(chip);
749
mutex_unlock(&chip->mutex);
753
static ssize_t bh1770_prox_enable_show(struct device *dev,
754
struct device_attribute *attr, char *buf)
756
struct bh1770_chip *chip = dev_get_drvdata(dev);
759
mutex_lock(&chip->mutex);
760
len = sprintf(buf, "%d\n", chip->prox_enable_count);
761
mutex_unlock(&chip->mutex);
765
static ssize_t bh1770_prox_result_show(struct device *dev,
766
struct device_attribute *attr, char *buf)
768
struct bh1770_chip *chip = dev_get_drvdata(dev);
771
mutex_lock(&chip->mutex);
772
if (chip->prox_enable_count && !pm_runtime_suspended(dev))
773
ret = sprintf(buf, "%d\n", chip->prox_data);
776
mutex_unlock(&chip->mutex);
780
static ssize_t bh1770_prox_range_show(struct device *dev,
781
struct device_attribute *attr, char *buf)
783
return sprintf(buf, "%d\n", BH1770_PROX_RANGE);
786
static ssize_t bh1770_get_prox_rate_avail(struct device *dev,
787
struct device_attribute *attr, char *buf)
791
for (i = 0; i < ARRAY_SIZE(prox_rates_hz); i++)
792
pos += sprintf(buf + pos, "%d ", prox_rates_hz[i]);
793
sprintf(buf + pos - 1, "\n");
797
static ssize_t bh1770_get_prox_rate_above(struct device *dev,
798
struct device_attribute *attr, char *buf)
800
struct bh1770_chip *chip = dev_get_drvdata(dev);
801
return sprintf(buf, "%d\n", prox_rates_hz[chip->prox_rate_threshold]);
804
static ssize_t bh1770_get_prox_rate_below(struct device *dev,
805
struct device_attribute *attr, char *buf)
807
struct bh1770_chip *chip = dev_get_drvdata(dev);
808
return sprintf(buf, "%d\n", prox_rates_hz[chip->prox_rate]);
811
static int bh1770_prox_rate_validate(int rate)
815
for (i = 0; i < ARRAY_SIZE(prox_rates_hz) - 1; i++)
816
if (rate >= prox_rates_hz[i])
821
static ssize_t bh1770_set_prox_rate_above(struct device *dev,
822
struct device_attribute *attr,
823
const char *buf, size_t count)
825
struct bh1770_chip *chip = dev_get_drvdata(dev);
828
if (strict_strtoul(buf, 0, &value))
831
mutex_lock(&chip->mutex);
832
chip->prox_rate_threshold = bh1770_prox_rate_validate(value);
833
mutex_unlock(&chip->mutex);
837
static ssize_t bh1770_set_prox_rate_below(struct device *dev,
838
struct device_attribute *attr,
839
const char *buf, size_t count)
841
struct bh1770_chip *chip = dev_get_drvdata(dev);
844
if (strict_strtoul(buf, 0, &value))
847
mutex_lock(&chip->mutex);
848
chip->prox_rate = bh1770_prox_rate_validate(value);
849
mutex_unlock(&chip->mutex);
853
static ssize_t bh1770_get_prox_thres(struct device *dev,
854
struct device_attribute *attr, char *buf)
856
struct bh1770_chip *chip = dev_get_drvdata(dev);
857
return sprintf(buf, "%d\n", chip->prox_threshold);
860
static ssize_t bh1770_set_prox_thres(struct device *dev,
861
struct device_attribute *attr,
862
const char *buf, size_t count)
864
struct bh1770_chip *chip = dev_get_drvdata(dev);
868
if (strict_strtoul(buf, 0, &value))
870
if (value > BH1770_PROX_RANGE)
873
mutex_lock(&chip->mutex);
874
chip->prox_threshold = value;
875
ret = bh1770_prox_set_threshold(chip);
876
mutex_unlock(&chip->mutex);
882
static ssize_t bh1770_prox_persistence_show(struct device *dev,
883
struct device_attribute *attr, char *buf)
885
struct bh1770_chip *chip = dev_get_drvdata(dev);
887
return sprintf(buf, "%u\n", chip->prox_persistence);
890
static ssize_t bh1770_prox_persistence_store(struct device *dev,
891
struct device_attribute *attr,
892
const char *buf, size_t len)
894
struct bh1770_chip *chip = dev_get_drvdata(dev);
897
if (strict_strtoul(buf, 0, &value))
900
if (value > BH1770_PROX_MAX_PERSISTENCE)
903
chip->prox_persistence = value;
908
static ssize_t bh1770_prox_abs_thres_show(struct device *dev,
909
struct device_attribute *attr, char *buf)
911
struct bh1770_chip *chip = dev_get_drvdata(dev);
912
return sprintf(buf, "%u\n", chip->prox_abs_thres);
915
static ssize_t bh1770_prox_abs_thres_store(struct device *dev,
916
struct device_attribute *attr,
917
const char *buf, size_t len)
919
struct bh1770_chip *chip = dev_get_drvdata(dev);
922
if (strict_strtoul(buf, 0, &value))
925
if (value > BH1770_PROX_RANGE)
928
chip->prox_abs_thres = value;
933
static ssize_t bh1770_chip_id_show(struct device *dev,
934
struct device_attribute *attr, char *buf)
936
struct bh1770_chip *chip = dev_get_drvdata(dev);
937
return sprintf(buf, "%s rev %d\n", chip->chipname, chip->revision);
940
static ssize_t bh1770_lux_calib_default_show(struct device *dev,
941
struct device_attribute *attr, char *buf)
943
return sprintf(buf, "%u\n", BH1770_CALIB_SCALER);
946
static ssize_t bh1770_lux_calib_show(struct device *dev,
947
struct device_attribute *attr, char *buf)
949
struct bh1770_chip *chip = dev_get_drvdata(dev);
952
mutex_lock(&chip->mutex);
953
len = sprintf(buf, "%u\n", chip->lux_calib);
954
mutex_unlock(&chip->mutex);
958
static ssize_t bh1770_lux_calib_store(struct device *dev,
959
struct device_attribute *attr,
960
const char *buf, size_t len)
962
struct bh1770_chip *chip = dev_get_drvdata(dev);
967
if (strict_strtoul(buf, 0, &value))
970
mutex_lock(&chip->mutex);
971
old_calib = chip->lux_calib;
972
chip->lux_calib = value;
973
new_corr = bh1770_get_corr_value(chip);
975
chip->lux_calib = old_calib;
976
mutex_unlock(&chip->mutex);
979
chip->lux_corr = new_corr;
980
/* Refresh thresholds on HW after changing correction value */
981
bh1770_lux_update_thresholds(chip, chip->lux_threshold_hi,
982
chip->lux_threshold_lo);
984
mutex_unlock(&chip->mutex);
989
static ssize_t bh1770_get_lux_rate_avail(struct device *dev,
990
struct device_attribute *attr, char *buf)
994
for (i = 0; i < ARRAY_SIZE(lux_rates_hz); i++)
995
pos += sprintf(buf + pos, "%d ", lux_rates_hz[i]);
996
sprintf(buf + pos - 1, "\n");
1000
static ssize_t bh1770_get_lux_rate(struct device *dev,
1001
struct device_attribute *attr, char *buf)
1003
struct bh1770_chip *chip = dev_get_drvdata(dev);
1004
return sprintf(buf, "%d\n", lux_rates_hz[chip->lux_rate_index]);
1007
static ssize_t bh1770_set_lux_rate(struct device *dev,
1008
struct device_attribute *attr,
1009
const char *buf, size_t count)
1011
struct bh1770_chip *chip = dev_get_drvdata(dev);
1012
unsigned long rate_hz;
1015
if (strict_strtoul(buf, 0, &rate_hz))
1018
for (i = 0; i < ARRAY_SIZE(lux_rates_hz) - 1; i++)
1019
if (rate_hz >= lux_rates_hz[i])
1022
mutex_lock(&chip->mutex);
1023
chip->lux_rate_index = i;
1024
ret = bh1770_lux_rate(chip, i);
1025
mutex_unlock(&chip->mutex);
1033
static ssize_t bh1770_get_lux_thresh_above(struct device *dev,
1034
struct device_attribute *attr, char *buf)
1036
struct bh1770_chip *chip = dev_get_drvdata(dev);
1037
return sprintf(buf, "%d\n", chip->lux_threshold_hi);
1040
static ssize_t bh1770_get_lux_thresh_below(struct device *dev,
1041
struct device_attribute *attr, char *buf)
1043
struct bh1770_chip *chip = dev_get_drvdata(dev);
1044
return sprintf(buf, "%d\n", chip->lux_threshold_lo);
1047
static ssize_t bh1770_set_lux_thresh(struct bh1770_chip *chip, u16 *target,
1051
unsigned long thresh;
1053
if (strict_strtoul(buf, 0, &thresh))
1056
if (thresh > BH1770_LUX_RANGE)
1059
mutex_lock(&chip->mutex);
1062
* Don't update values in HW if we are still waiting for
1063
* first interrupt to come after device handle open call.
1065
if (!chip->lux_wait_result)
1066
ret = bh1770_lux_update_thresholds(chip,
1067
chip->lux_threshold_hi,
1068
chip->lux_threshold_lo);
1069
mutex_unlock(&chip->mutex);
1074
static ssize_t bh1770_set_lux_thresh_above(struct device *dev,
1075
struct device_attribute *attr,
1076
const char *buf, size_t len)
1078
struct bh1770_chip *chip = dev_get_drvdata(dev);
1079
int ret = bh1770_set_lux_thresh(chip, &chip->lux_threshold_hi, buf);
1085
static ssize_t bh1770_set_lux_thresh_below(struct device *dev,
1086
struct device_attribute *attr,
1087
const char *buf, size_t len)
1089
struct bh1770_chip *chip = dev_get_drvdata(dev);
1090
int ret = bh1770_set_lux_thresh(chip, &chip->lux_threshold_lo, buf);
1096
static DEVICE_ATTR(prox0_raw_en, S_IRUGO | S_IWUSR, bh1770_prox_enable_show,
1097
bh1770_prox_enable_store);
1098
static DEVICE_ATTR(prox0_thresh_above1_value, S_IRUGO | S_IWUSR,
1099
bh1770_prox_abs_thres_show,
1100
bh1770_prox_abs_thres_store);
1101
static DEVICE_ATTR(prox0_thresh_above0_value, S_IRUGO | S_IWUSR,
1102
bh1770_get_prox_thres,
1103
bh1770_set_prox_thres);
1104
static DEVICE_ATTR(prox0_raw, S_IRUGO, bh1770_prox_result_show, NULL);
1105
static DEVICE_ATTR(prox0_sensor_range, S_IRUGO, bh1770_prox_range_show, NULL);
1106
static DEVICE_ATTR(prox0_thresh_above_count, S_IRUGO | S_IWUSR,
1107
bh1770_prox_persistence_show,
1108
bh1770_prox_persistence_store);
1109
static DEVICE_ATTR(prox0_rate_above, S_IRUGO | S_IWUSR,
1110
bh1770_get_prox_rate_above,
1111
bh1770_set_prox_rate_above);
1112
static DEVICE_ATTR(prox0_rate_below, S_IRUGO | S_IWUSR,
1113
bh1770_get_prox_rate_below,
1114
bh1770_set_prox_rate_below);
1115
static DEVICE_ATTR(prox0_rate_avail, S_IRUGO, bh1770_get_prox_rate_avail, NULL);
1117
static DEVICE_ATTR(lux0_calibscale, S_IRUGO | S_IWUSR, bh1770_lux_calib_show,
1118
bh1770_lux_calib_store);
1119
static DEVICE_ATTR(lux0_calibscale_default, S_IRUGO,
1120
bh1770_lux_calib_default_show,
1122
static DEVICE_ATTR(lux0_input, S_IRUGO, bh1770_lux_result_show, NULL);
1123
static DEVICE_ATTR(lux0_sensor_range, S_IRUGO, bh1770_lux_range_show, NULL);
1124
static DEVICE_ATTR(lux0_rate, S_IRUGO | S_IWUSR, bh1770_get_lux_rate,
1125
bh1770_set_lux_rate);
1126
static DEVICE_ATTR(lux0_rate_avail, S_IRUGO, bh1770_get_lux_rate_avail, NULL);
1127
static DEVICE_ATTR(lux0_thresh_above_value, S_IRUGO | S_IWUSR,
1128
bh1770_get_lux_thresh_above,
1129
bh1770_set_lux_thresh_above);
1130
static DEVICE_ATTR(lux0_thresh_below_value, S_IRUGO | S_IWUSR,
1131
bh1770_get_lux_thresh_below,
1132
bh1770_set_lux_thresh_below);
1133
static DEVICE_ATTR(chip_id, S_IRUGO, bh1770_chip_id_show, NULL);
1134
static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR, bh1770_power_state_show,
1135
bh1770_power_state_store);
1138
static struct attribute *sysfs_attrs[] = {
1139
&dev_attr_lux0_calibscale.attr,
1140
&dev_attr_lux0_calibscale_default.attr,
1141
&dev_attr_lux0_input.attr,
1142
&dev_attr_lux0_sensor_range.attr,
1143
&dev_attr_lux0_rate.attr,
1144
&dev_attr_lux0_rate_avail.attr,
1145
&dev_attr_lux0_thresh_above_value.attr,
1146
&dev_attr_lux0_thresh_below_value.attr,
1147
&dev_attr_prox0_raw.attr,
1148
&dev_attr_prox0_sensor_range.attr,
1149
&dev_attr_prox0_raw_en.attr,
1150
&dev_attr_prox0_thresh_above_count.attr,
1151
&dev_attr_prox0_rate_above.attr,
1152
&dev_attr_prox0_rate_below.attr,
1153
&dev_attr_prox0_rate_avail.attr,
1154
&dev_attr_prox0_thresh_above0_value.attr,
1155
&dev_attr_prox0_thresh_above1_value.attr,
1156
&dev_attr_chip_id.attr,
1157
&dev_attr_power_state.attr,
1161
static struct attribute_group bh1770_attribute_group = {
1162
.attrs = sysfs_attrs
1165
static int __devinit bh1770_probe(struct i2c_client *client,
1166
const struct i2c_device_id *id)
1168
struct bh1770_chip *chip;
1171
chip = kzalloc(sizeof *chip, GFP_KERNEL);
1175
i2c_set_clientdata(client, chip);
1176
chip->client = client;
1178
mutex_init(&chip->mutex);
1179
init_waitqueue_head(&chip->wait);
1180
INIT_DELAYED_WORK(&chip->prox_work, bh1770_prox_work);
1182
if (client->dev.platform_data == NULL) {
1183
dev_err(&client->dev, "platform data is mandatory\n");
1188
chip->pdata = client->dev.platform_data;
1189
chip->lux_calib = BH1770_LUX_NEUTRAL_CALIB_VALUE;
1190
chip->lux_rate_index = BH1770_LUX_DEFAULT_RATE;
1191
chip->lux_threshold_lo = BH1770_LUX_DEF_THRES;
1192
chip->lux_threshold_hi = BH1770_LUX_DEF_THRES;
1194
if (chip->pdata->glass_attenuation == 0)
1195
chip->lux_ga = BH1770_NEUTRAL_GA;
1197
chip->lux_ga = chip->pdata->glass_attenuation;
1199
chip->prox_threshold = BH1770_PROX_DEF_THRES;
1200
chip->prox_led = chip->pdata->led_def_curr;
1201
chip->prox_abs_thres = BH1770_PROX_DEF_ABS_THRES;
1202
chip->prox_persistence = BH1770_DEFAULT_PERSISTENCE;
1203
chip->prox_rate_threshold = BH1770_PROX_DEF_RATE_THRESH;
1204
chip->prox_rate = BH1770_PROX_DEFAULT_RATE;
1205
chip->prox_data = 0;
1207
chip->regs[0].supply = reg_vcc;
1208
chip->regs[1].supply = reg_vleds;
1210
err = regulator_bulk_get(&client->dev,
1211
ARRAY_SIZE(chip->regs), chip->regs);
1213
dev_err(&client->dev, "Cannot get regulators\n");
1217
err = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
1220
dev_err(&client->dev, "Cannot enable regulators\n");
1224
usleep_range(BH1770_STARTUP_DELAY, BH1770_STARTUP_DELAY * 2);
1225
err = bh1770_detect(chip);
1230
bh1770_chip_on(chip);
1231
pm_runtime_set_active(&client->dev);
1232
pm_runtime_enable(&client->dev);
1234
chip->lux_corr = bh1770_get_corr_value(chip);
1235
if (chip->lux_corr == 0) {
1236
dev_err(&client->dev, "Improper correction values\n");
1241
if (chip->pdata->setup_resources) {
1242
err = chip->pdata->setup_resources();
1249
err = sysfs_create_group(&chip->client->dev.kobj,
1250
&bh1770_attribute_group);
1252
dev_err(&chip->client->dev, "Sysfs registration failed\n");
1257
* Chip needs level triggered interrupt to work. However,
1258
* level triggering doesn't work always correctly with power
1259
* management. Select both
1261
err = request_threaded_irq(client->irq, NULL,
1263
IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
1267
dev_err(&client->dev, "could not get IRQ %d\n",
1271
regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
1274
sysfs_remove_group(&chip->client->dev.kobj,
1275
&bh1770_attribute_group);
1277
if (chip->pdata->release_resources)
1278
chip->pdata->release_resources();
1280
regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
1282
regulator_bulk_free(ARRAY_SIZE(chip->regs), chip->regs);
1288
static int __devexit bh1770_remove(struct i2c_client *client)
1290
struct bh1770_chip *chip = i2c_get_clientdata(client);
1292
free_irq(client->irq, chip);
1294
sysfs_remove_group(&chip->client->dev.kobj,
1295
&bh1770_attribute_group);
1297
if (chip->pdata->release_resources)
1298
chip->pdata->release_resources();
1300
cancel_delayed_work_sync(&chip->prox_work);
1302
if (!pm_runtime_suspended(&client->dev))
1303
bh1770_chip_off(chip);
1305
pm_runtime_disable(&client->dev);
1306
pm_runtime_set_suspended(&client->dev);
1308
regulator_bulk_free(ARRAY_SIZE(chip->regs), chip->regs);
1314
static int bh1770_suspend(struct device *dev)
1316
struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1317
struct bh1770_chip *chip = i2c_get_clientdata(client);
1319
bh1770_chip_off(chip);
1324
static int bh1770_resume(struct device *dev)
1326
struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1327
struct bh1770_chip *chip = i2c_get_clientdata(client);
1330
bh1770_chip_on(chip);
1332
if (!pm_runtime_suspended(dev)) {
1334
* If we were enabled at suspend time, it is expected
1335
* everything works nice and smoothly
1337
ret = bh1770_lux_rate(chip, chip->lux_rate_index);
1338
ret |= bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
1340
/* This causes interrupt after the next measurement cycle */
1341
bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
1342
BH1770_LUX_DEF_THRES);
1343
/* Inform that we are waiting for a result from ALS */
1344
chip->lux_wait_result = true;
1345
bh1770_prox_mode_control(chip);
1351
#define bh1770_suspend NULL
1352
#define bh1770_shutdown NULL
1353
#define bh1770_resume NULL
1356
#ifdef CONFIG_PM_RUNTIME
1357
static int bh1770_runtime_suspend(struct device *dev)
1359
struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1360
struct bh1770_chip *chip = i2c_get_clientdata(client);
1362
bh1770_chip_off(chip);
1367
static int bh1770_runtime_resume(struct device *dev)
1369
struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1370
struct bh1770_chip *chip = i2c_get_clientdata(client);
1372
bh1770_chip_on(chip);
1378
static const struct i2c_device_id bh1770_id[] = {
1384
MODULE_DEVICE_TABLE(i2c, bh1770_id);
1386
static const struct dev_pm_ops bh1770_pm_ops = {
1387
SET_SYSTEM_SLEEP_PM_OPS(bh1770_suspend, bh1770_resume)
1388
SET_RUNTIME_PM_OPS(bh1770_runtime_suspend, bh1770_runtime_resume, NULL)
1391
static struct i2c_driver bh1770_driver = {
1393
.name = "bh1770glc",
1394
.owner = THIS_MODULE,
1395
.pm = &bh1770_pm_ops,
1397
.probe = bh1770_probe,
1398
.remove = __devexit_p(bh1770_remove),
1399
.id_table = bh1770_id,
1402
static int __init bh1770_init(void)
1404
return i2c_add_driver(&bh1770_driver);
1407
static void __exit bh1770_exit(void)
1409
i2c_del_driver(&bh1770_driver);
1412
MODULE_DESCRIPTION("BH1770GLC / SFH7770 combined ALS and proximity sensor");
1413
MODULE_AUTHOR("Samu Onkalo, Nokia Corporation");
1414
MODULE_LICENSE("GPL v2");
1416
module_init(bh1770_init);
1417
module_exit(bh1770_exit);