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authorSamu Onkalo <samu.p.onkalo@nokia.com>2010-10-26 17:22:37 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-26 19:52:14 -0400
commit190420ab34ab4c077c641893ac19f364cf3606e4 (patch)
tree202b84214c818dff63eb4a0fe37d87679604d443 /drivers/misc
parent4b068de9ab1c404734fde90ce5d3f4f5b4f0b9d5 (diff)
drivers/misc: driver for bh1770glc / sfh7770 ALS and proximity sensor
This is a driver for ROHM BH1770GLC and OSRAM SFH7770 combined ALS and proximity sensor. Interface is sysfs based. The driver uses interrupts to provide new data. The driver supports pm_runtime and regulator frameworks. See Documentation/misc-devices/bh1770glc.txt for details Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com> Acked-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/Kconfig10
-rw-r--r--drivers/misc/Makefile1
-rw-r--r--drivers/misc/bh1770glc.c1413
3 files changed, 1424 insertions, 0 deletions
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 3d57adfc8703..3b50106abfa5 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -315,6 +315,16 @@ config SENSORS_BH1780
315 This driver can also be built as a module. If so, the module 315 This driver can also be built as a module. If so, the module
316 will be called bh1780gli. 316 will be called bh1780gli.
317 317
318config SENSORS_BH1770
319 tristate "BH1770GLC / SFH7770 combined ALS - Proximity sensor"
320 depends on I2C
321 ---help---
322 Say Y here if you want to build a driver for BH1770GLC (ROHM) or
323 SFH7770 (Osram) combined ambient light and proximity sensor chip.
324
325 To compile this driver as a module, choose M here: the
326 module will be called bh1770glc. If unsure, say N here.
327
318config HMC6352 328config HMC6352
319 tristate "Honeywell HMC6352 compass" 329 tristate "Honeywell HMC6352 compass"
320 depends on I2C 330 depends on I2C
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 9f2986b4da2f..5fed6ab533e2 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_TIFM_CORE) += tifm_core.o
16obj-$(CONFIG_TIFM_7XX1) += tifm_7xx1.o 16obj-$(CONFIG_TIFM_7XX1) += tifm_7xx1.o
17obj-$(CONFIG_PHANTOM) += phantom.o 17obj-$(CONFIG_PHANTOM) += phantom.o
18obj-$(CONFIG_SENSORS_BH1780) += bh1780gli.o 18obj-$(CONFIG_SENSORS_BH1780) += bh1780gli.o
19obj-$(CONFIG_SENSORS_BH1770) += bh1770glc.o
19obj-$(CONFIG_SGI_IOC4) += ioc4.o 20obj-$(CONFIG_SGI_IOC4) += ioc4.o
20obj-$(CONFIG_ENCLOSURE_SERVICES) += enclosure.o 21obj-$(CONFIG_ENCLOSURE_SERVICES) += enclosure.o
21obj-$(CONFIG_KGDB_TESTS) += kgdbts.o 22obj-$(CONFIG_KGDB_TESTS) += kgdbts.o
diff --git a/drivers/misc/bh1770glc.c b/drivers/misc/bh1770glc.c
new file mode 100644
index 000000000000..cee632e645e1
--- /dev/null
+++ b/drivers/misc/bh1770glc.c
@@ -0,0 +1,1413 @@
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
134struct 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
173static const char reg_vcc[] = "Vcc";
174static 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 */
180static const s16 prox_rates_hz[] = {100, 50, 33, 25, 14, 10, 5, 2};
181static const s16 prox_rates_ms[] = {10, 20, 30, 40, 70, 100, 200, 500};
182
183/* Supported IR-led currents in mA */
184static 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 */
190static 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 */
196static 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
206static 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 */
216static 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
231static 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 */
244static 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 */
260static 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
270static 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 */
288static 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
303static 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
310static 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 */
317static 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
357static 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 */
377static 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
389static 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 */
399static 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
430static 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 */
442static 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 */
465static 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 }
518out:
519 return ret;
520}
521
522static 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;
559error:
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
574static 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 */
585static 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
646static 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;
679leave:
680 mutex_unlock(&chip->mutex);
681 return ret;
682}
683
684static 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
690static 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
713static 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
719static 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);
744leave:
745 mutex_unlock(&chip->mutex);
746 return count;
747}
748
749static 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
761static 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
776static 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
782static 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
793static 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
800static 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
807static 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
817static 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
833static 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
849static 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
856static 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
878static 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
886static 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
904static 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
911static 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
929static 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
936static 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
942static 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
954static 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
985static 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
996static 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
1003static 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
1029static 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
1036static 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
1043static 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
1070static 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
1081static 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
1092static DEVICE_ATTR(prox0_raw_en, S_IRUGO | S_IWUSR, bh1770_prox_enable_show,
1093 bh1770_prox_enable_store);
1094static DEVICE_ATTR(prox0_thresh_above1_value, S_IRUGO | S_IWUSR,
1095 bh1770_prox_abs_thres_show,
1096 bh1770_prox_abs_thres_store);
1097static DEVICE_ATTR(prox0_thresh_above0_value, S_IRUGO | S_IWUSR,
1098 bh1770_get_prox_thres,
1099 bh1770_set_prox_thres);
1100static DEVICE_ATTR(prox0_raw, S_IRUGO, bh1770_prox_result_show, NULL);
1101static DEVICE_ATTR(prox0_sensor_range, S_IRUGO, bh1770_prox_range_show, NULL);
1102static DEVICE_ATTR(prox0_thresh_above_count, S_IRUGO | S_IWUSR,
1103 bh1770_prox_persistence_show,
1104 bh1770_prox_persistence_store);
1105static DEVICE_ATTR(prox0_rate_above, S_IRUGO | S_IWUSR,
1106 bh1770_get_prox_rate_above,
1107 bh1770_set_prox_rate_above);
1108static DEVICE_ATTR(prox0_rate_below, S_IRUGO | S_IWUSR,
1109 bh1770_get_prox_rate_below,
1110 bh1770_set_prox_rate_below);
1111static DEVICE_ATTR(prox0_rate_avail, S_IRUGO, bh1770_get_prox_rate_avail, NULL);
1112
1113static DEVICE_ATTR(lux0_calibscale, S_IRUGO | S_IWUSR, bh1770_lux_calib_show,
1114 bh1770_lux_calib_store);
1115static DEVICE_ATTR(lux0_calibscale_default, S_IRUGO,
1116 bh1770_lux_calib_default_show,
1117 NULL);
1118static DEVICE_ATTR(lux0_input, S_IRUGO, bh1770_lux_result_show, NULL);
1119static DEVICE_ATTR(lux0_sensor_range, S_IRUGO, bh1770_lux_range_show, NULL);
1120static DEVICE_ATTR(lux0_rate, S_IRUGO | S_IWUSR, bh1770_get_lux_rate,
1121 bh1770_set_lux_rate);
1122static DEVICE_ATTR(lux0_rate_avail, S_IRUGO, bh1770_get_lux_rate_avail, NULL);
1123static DEVICE_ATTR(lux0_thresh_above_value, S_IRUGO | S_IWUSR,
1124 bh1770_get_lux_thresh_above,
1125 bh1770_set_lux_thresh_above);
1126static DEVICE_ATTR(lux0_thresh_below_value, S_IRUGO | S_IWUSR,
1127 bh1770_get_lux_thresh_below,
1128 bh1770_set_lux_thresh_below);
1129static DEVICE_ATTR(chip_id, S_IRUGO, bh1770_chip_id_show, NULL);
1130static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR, bh1770_power_state_show,
1131 bh1770_power_state_store);
1132
1133
1134static 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
1157static struct attribute_group bh1770_attribute_group = {
1158 .attrs = sysfs_attrs
1159};
1160
1161static 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;
1269fail5:
1270 sysfs_remove_group(&chip->client->dev.kobj,
1271 &bh1770_attribute_group);
1272fail4:
1273 if (chip->pdata->release_resources)
1274 chip->pdata->release_resources();
1275fail3:
1276 regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
1277fail2:
1278 regulator_bulk_free(ARRAY_SIZE(chip->regs), chip->regs);
1279fail1:
1280 kfree(chip);
1281 return err;
1282}
1283
1284static 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
1310static 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
1320static 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
1353static 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
1363static 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
1374static const struct i2c_device_id bh1770_id[] = {
1375 {"bh1770glc", 0 },
1376 {"sfh7770", 0 },
1377 {}
1378};
1379
1380MODULE_DEVICE_TABLE(i2c, bh1770_id);
1381
1382static 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
1387static 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
1398static int __init bh1770_init(void)
1399{
1400 return i2c_add_driver(&bh1770_driver);
1401}
1402
1403static void __exit bh1770_exit(void)
1404{
1405 i2c_del_driver(&bh1770_driver);
1406}
1407
1408MODULE_DESCRIPTION("BH1770GLC / SFH7770 combined ALS and proximity sensor");
1409MODULE_AUTHOR("Samu Onkalo, Nokia Corporation");
1410MODULE_LICENSE("GPL v2");
1411
1412module_init(bh1770_init);
1413module_exit(bh1770_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 07:17:11 -0500