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190420ab SO |
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); |