drivers/misc/bh1770glc.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
bh1770_lux_interrupt_control
bh1770_prox_interrupt_control
bh1770_lux_rate
bh1770_prox_rate
bh1770_led_cfg
bh1770_psraw_to_adjusted
bh1770_psadjusted_to_raw
bh1770_prox_set_threshold
bh1770_lux_raw_to_adjusted
bh1770_lux_adjusted_to_raw
bh1770_lux_update_thresholds
bh1770_lux_get_result
bh1770_get_corr_value
bh1770_lux_read_result
bh1770_chip_on
bh1770_chip_off
bh1770_prox_mode_control
bh1770_prox_read_result
bh1770_detect
bh1770_prox_work
bh1770_irq
bh1770_power_state_store
bh1770_power_state_show
bh1770_lux_result_show
bh1770_lux_range_show
bh1770_prox_enable_store
bh1770_prox_enable_show
bh1770_prox_result_show
bh1770_prox_range_show
bh1770_get_prox_rate_avail
bh1770_get_prox_rate_above
bh1770_get_prox_rate_below
bh1770_prox_rate_validate
bh1770_set_prox_rate_above
bh1770_set_prox_rate_below
bh1770_get_prox_thres
bh1770_set_prox_thres
bh1770_prox_persistence_show
bh1770_prox_persistence_store
bh1770_prox_abs_thres_show
bh1770_prox_abs_thres_store
bh1770_chip_id_show
bh1770_lux_calib_default_show
bh1770_lux_calib_show
bh1770_lux_calib_store
bh1770_get_lux_rate_avail
bh1770_get_lux_rate
bh1770_set_lux_rate
bh1770_get_lux_thresh_above
bh1770_get_lux_thresh_below
bh1770_set_lux_thresh
bh1770_set_lux_thresh_above
bh1770_set_lux_thresh_below
bh1770_probe
bh1770_remove
bh1770_suspend
bh1770_resume
bh1770_runtime_suspend
bh1770_runtime_resume
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * This file is part of the ROHM BH1770GLC / OSRAM SFH7770 sensor driver.
   4  * Chip is combined proximity and ambient light sensor.
   5  *
   6  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
   7  *
   8  * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
   9  */
  10 
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/i2c.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/mutex.h>
  16 #include <linux/platform_data/bh1770glc.h>
  17 #include <linux/regulator/consumer.h>
  18 #include <linux/pm_runtime.h>
  19 #include <linux/workqueue.h>
  20 #include <linux/delay.h>
  21 #include <linux/wait.h>
  22 #include <linux/slab.h>
  23 
  24 #define BH1770_ALS_CONTROL      0x80 /* ALS operation mode control */
  25 #define BH1770_PS_CONTROL       0x81 /* PS operation mode control */
  26 #define BH1770_I_LED            0x82 /* active LED and LED1, LED2 current */
  27 #define BH1770_I_LED3           0x83 /* LED3 current setting */
  28 #define BH1770_ALS_PS_MEAS      0x84 /* Forced mode trigger */
  29 #define BH1770_PS_MEAS_RATE     0x85 /* PS meas. rate at stand alone mode */
  30 #define BH1770_ALS_MEAS_RATE    0x86 /* ALS meas. rate at stand alone mode */
  31 #define BH1770_PART_ID          0x8a /* Part number and revision ID */
  32 #define BH1770_MANUFACT_ID      0x8b /* Manufacturerer ID */
  33 #define BH1770_ALS_DATA_0       0x8c /* ALS DATA low byte */
  34 #define BH1770_ALS_DATA_1       0x8d /* ALS DATA high byte */
  35 #define BH1770_ALS_PS_STATUS    0x8e /* Measurement data and int status */
  36 #define BH1770_PS_DATA_LED1     0x8f /* PS data from LED1 */
  37 #define BH1770_PS_DATA_LED2     0x90 /* PS data from LED2 */
  38 #define BH1770_PS_DATA_LED3     0x91 /* PS data from LED3 */
  39 #define BH1770_INTERRUPT        0x92 /* Interrupt setting */
  40 #define BH1770_PS_TH_LED1       0x93 /* PS interrupt threshold for LED1 */
  41 #define BH1770_PS_TH_LED2       0x94 /* PS interrupt threshold for LED2 */
  42 #define BH1770_PS_TH_LED3       0x95 /* PS interrupt threshold for LED3 */
  43 #define BH1770_ALS_TH_UP_0      0x96 /* ALS upper threshold low byte */
  44 #define BH1770_ALS_TH_UP_1      0x97 /* ALS upper threshold high byte */
  45 #define BH1770_ALS_TH_LOW_0     0x98 /* ALS lower threshold low byte */
  46 #define BH1770_ALS_TH_LOW_1     0x99 /* ALS lower threshold high byte */
  47 
  48 /* MANUFACT_ID */
  49 #define BH1770_MANUFACT_ROHM    0x01
  50 #define BH1770_MANUFACT_OSRAM   0x03
  51 
  52 /* PART_ID */
  53 #define BH1770_PART             0x90
  54 #define BH1770_PART_MASK        0xf0
  55 #define BH1770_REV_MASK         0x0f
  56 #define BH1770_REV_SHIFT        0
  57 #define BH1770_REV_0            0x00
  58 #define BH1770_REV_1            0x01
  59 
  60 /* Operating modes for both */
  61 #define BH1770_STANDBY          0x00
  62 #define BH1770_FORCED           0x02
  63 #define BH1770_STANDALONE       0x03
  64 #define BH1770_SWRESET          (0x01 << 2)
  65 
  66 #define BH1770_PS_TRIG_MEAS     (1 << 0)
  67 #define BH1770_ALS_TRIG_MEAS    (1 << 1)
  68 
  69 /* Interrupt control */
  70 #define BH1770_INT_OUTPUT_MODE  (1 << 3) /* 0 = latched */
  71 #define BH1770_INT_POLARITY     (1 << 2) /* 1 = active high */
  72 #define BH1770_INT_ALS_ENA      (1 << 1)
  73 #define BH1770_INT_PS_ENA       (1 << 0)
  74 
  75 /* Interrupt status */
  76 #define BH1770_INT_LED1_DATA    (1 << 0)
  77 #define BH1770_INT_LED1_INT     (1 << 1)
  78 #define BH1770_INT_LED2_DATA    (1 << 2)
  79 #define BH1770_INT_LED2_INT     (1 << 3)
  80 #define BH1770_INT_LED3_DATA    (1 << 4)
  81 #define BH1770_INT_LED3_INT     (1 << 5)
  82 #define BH1770_INT_LEDS_INT     ((1 << 1) | (1 << 3) | (1 << 5))
  83 #define BH1770_INT_ALS_DATA     (1 << 6)
  84 #define BH1770_INT_ALS_INT      (1 << 7)
  85 
  86 /* Led channels */
  87 #define BH1770_LED1             0x00
  88 
  89 #define BH1770_DISABLE          0
  90 #define BH1770_ENABLE           1
  91 #define BH1770_PROX_CHANNELS    1
  92 
  93 #define BH1770_LUX_DEFAULT_RATE 1 /* Index to lux rate table */
  94 #define BH1770_PROX_DEFAULT_RATE 1 /* Direct HW value =~ 50Hz */
  95 #define BH1770_PROX_DEF_RATE_THRESH 6 /* Direct HW value =~ 5 Hz */
  96 #define BH1770_STARTUP_DELAY    50
  97 #define BH1770_RESET_TIME       10
  98 #define BH1770_TIMEOUT          2100 /* Timeout in 2.1 seconds */
  99 
 100 #define BH1770_LUX_RANGE        65535
 101 #define BH1770_PROX_RANGE       255
 102 #define BH1770_COEF_SCALER      1024
 103 #define BH1770_CALIB_SCALER     8192
 104 #define BH1770_LUX_NEUTRAL_CALIB_VALUE (1 * BH1770_CALIB_SCALER)
 105 #define BH1770_LUX_DEF_THRES    1000
 106 #define BH1770_PROX_DEF_THRES   70
 107 #define BH1770_PROX_DEF_ABS_THRES   100
 108 #define BH1770_DEFAULT_PERSISTENCE  10
 109 #define BH1770_PROX_MAX_PERSISTENCE 50
 110 #define BH1770_LUX_GA_SCALE     16384
 111 #define BH1770_LUX_CF_SCALE     2048 /* CF ChipFactor */
 112 #define BH1770_NEUTRAL_CF       BH1770_LUX_CF_SCALE
 113 #define BH1770_LUX_CORR_SCALE   4096
 114 
 115 #define PROX_ABOVE_THRESHOLD    1
 116 #define PROX_BELOW_THRESHOLD    0
 117 
 118 #define PROX_IGNORE_LUX_LIMIT   500
 119 
 120 struct bh1770_chip {
 121         struct bh1770_platform_data     *pdata;
 122         char                            chipname[10];
 123         u8                              revision;
 124         struct i2c_client               *client;
 125         struct regulator_bulk_data      regs[2];
 126         struct mutex                    mutex; /* avoid parallel access */
 127         wait_queue_head_t               wait;
 128 
 129         bool                    int_mode_prox;
 130         bool                    int_mode_lux;
 131         struct delayed_work     prox_work;
 132         u32     lux_cf; /* Chip specific factor */
 133         u32     lux_ga;
 134         u32     lux_calib;
 135         int     lux_rate_index;
 136         u32     lux_corr;
 137         u16     lux_data_raw;
 138         u16     lux_threshold_hi;
 139         u16     lux_threshold_lo;
 140         u16     lux_thres_hi_onchip;
 141         u16     lux_thres_lo_onchip;
 142         bool    lux_wait_result;
 143 
 144         int     prox_enable_count;
 145         u16     prox_coef;
 146         u16     prox_const;
 147         int     prox_rate;
 148         int     prox_rate_threshold;
 149         u8      prox_persistence;
 150         u8      prox_persistence_counter;
 151         u8      prox_data;
 152         u8      prox_threshold;
 153         u8      prox_threshold_hw;
 154         bool    prox_force_update;
 155         u8      prox_abs_thres;
 156         u8      prox_led;
 157 };
 158 
 159 static const char reg_vcc[] = "Vcc";
 160 static const char reg_vleds[] = "Vleds";
 161 
 162 /*
 163  * Supported stand alone rates in ms from chip data sheet
 164  * {10, 20, 30, 40, 70, 100, 200, 500, 1000, 2000};
 165  */
 166 static const s16 prox_rates_hz[] = {100, 50, 33, 25, 14, 10, 5, 2};
 167 static const s16 prox_rates_ms[] = {10, 20, 30, 40, 70, 100, 200, 500};
 168 
 169 /*
 170  * Supported stand alone rates in ms from chip data sheet
 171  * {100, 200, 500, 1000, 2000};
 172  */
 173 static const s16 lux_rates_hz[] = {10, 5, 2, 1, 0};
 174 
 175 /*
 176  * interrupt control functions are called while keeping chip->mutex
 177  * excluding module probe / remove
 178  */
 179 static inline int bh1770_lux_interrupt_control(struct bh1770_chip *chip,
 180                                         int lux)
 181 {
 182         chip->int_mode_lux = lux;
 183         /* Set interrupt modes, interrupt active low, latched */
 184         return i2c_smbus_write_byte_data(chip->client,
 185                                         BH1770_INTERRUPT,
 186                                         (lux << 1) | chip->int_mode_prox);
 187 }
 188 
 189 static inline int bh1770_prox_interrupt_control(struct bh1770_chip *chip,
 190                                         int ps)
 191 {
 192         chip->int_mode_prox = ps;
 193         return i2c_smbus_write_byte_data(chip->client,
 194                                         BH1770_INTERRUPT,
 195                                         (chip->int_mode_lux << 1) | (ps << 0));
 196 }
 197 
 198 /* chip->mutex is always kept here */
 199 static int bh1770_lux_rate(struct bh1770_chip *chip, int rate_index)
 200 {
 201         /* sysfs may call this when the chip is powered off */
 202         if (pm_runtime_suspended(&chip->client->dev))
 203                 return 0;
 204 
 205         /* Proper proximity response needs fastest lux rate (100ms) */
 206         if (chip->prox_enable_count)
 207                 rate_index = 0;
 208 
 209         return i2c_smbus_write_byte_data(chip->client,
 210                                         BH1770_ALS_MEAS_RATE,
 211                                         rate_index);
 212 }
 213 
 214 static int bh1770_prox_rate(struct bh1770_chip *chip, int mode)
 215 {
 216         int rate;
 217 
 218         rate = (mode == PROX_ABOVE_THRESHOLD) ?
 219                 chip->prox_rate_threshold : chip->prox_rate;
 220 
 221         return i2c_smbus_write_byte_data(chip->client,
 222                                         BH1770_PS_MEAS_RATE,
 223                                         rate);
 224 }
 225 
 226 /* InfraredLED is controlled by the chip during proximity scanning */
 227 static inline int bh1770_led_cfg(struct bh1770_chip *chip)
 228 {
 229         /* LED cfg, current for leds 1 and 2 */
 230         return i2c_smbus_write_byte_data(chip->client,
 231                                         BH1770_I_LED,
 232                                         (BH1770_LED1 << 6) |
 233                                         (BH1770_LED_5mA << 3) |
 234                                         chip->prox_led);
 235 }
 236 
 237 /*
 238  * Following two functions converts raw ps values from HW to normalized
 239  * values. Purpose is to compensate differences between different sensor
 240  * versions and variants so that result means about the same between
 241  * versions.
 242  */
 243 static inline u8 bh1770_psraw_to_adjusted(struct bh1770_chip *chip, u8 psraw)
 244 {
 245         u16 adjusted;
 246         adjusted = (u16)(((u32)(psraw + chip->prox_const) * chip->prox_coef) /
 247                 BH1770_COEF_SCALER);
 248         if (adjusted > BH1770_PROX_RANGE)
 249                 adjusted = BH1770_PROX_RANGE;
 250         return adjusted;
 251 }
 252 
 253 static inline u8 bh1770_psadjusted_to_raw(struct bh1770_chip *chip, u8 ps)
 254 {
 255         u16 raw;
 256 
 257         raw = (((u32)ps * BH1770_COEF_SCALER) / chip->prox_coef);
 258         if (raw > chip->prox_const)
 259                 raw = raw - chip->prox_const;
 260         else
 261                 raw = 0;
 262         return raw;
 263 }
 264 
 265 /*
 266  * Following two functions converts raw lux values from HW to normalized
 267  * values. Purpose is to compensate differences between different sensor
 268  * versions and variants so that result means about the same between
 269  * versions. Chip->mutex is kept when this is called.
 270  */
 271 static int bh1770_prox_set_threshold(struct bh1770_chip *chip)
 272 {
 273         u8 tmp = 0;
 274 
 275         /* sysfs may call this when the chip is powered off */
 276         if (pm_runtime_suspended(&chip->client->dev))
 277                 return 0;
 278 
 279         tmp = bh1770_psadjusted_to_raw(chip, chip->prox_threshold);
 280         chip->prox_threshold_hw = tmp;
 281 
 282         return  i2c_smbus_write_byte_data(chip->client, BH1770_PS_TH_LED1,
 283                                         tmp);
 284 }
 285 
 286 static inline u16 bh1770_lux_raw_to_adjusted(struct bh1770_chip *chip, u16 raw)
 287 {
 288         u32 lux;
 289         lux = ((u32)raw * chip->lux_corr) / BH1770_LUX_CORR_SCALE;
 290         return min(lux, (u32)BH1770_LUX_RANGE);
 291 }
 292 
 293 static inline u16 bh1770_lux_adjusted_to_raw(struct bh1770_chip *chip,
 294                                         u16 adjusted)
 295 {
 296         return (u32)adjusted * BH1770_LUX_CORR_SCALE / chip->lux_corr;
 297 }
 298 
 299 /* chip->mutex is kept when this is called */
 300 static int bh1770_lux_update_thresholds(struct bh1770_chip *chip,
 301                                         u16 threshold_hi, u16 threshold_lo)
 302 {
 303         u8 data[4];
 304         int ret;
 305 
 306         /* sysfs may call this when the chip is powered off */
 307         if (pm_runtime_suspended(&chip->client->dev))
 308                 return 0;
 309 
 310         /*
 311          * Compensate threshold values with the correction factors if not
 312          * set to minimum or maximum.
 313          * Min & max values disables interrupts.
 314          */
 315         if (threshold_hi != BH1770_LUX_RANGE && threshold_hi != 0)
 316                 threshold_hi = bh1770_lux_adjusted_to_raw(chip, threshold_hi);
 317 
 318         if (threshold_lo != BH1770_LUX_RANGE && threshold_lo != 0)
 319                 threshold_lo = bh1770_lux_adjusted_to_raw(chip, threshold_lo);
 320 
 321         if (chip->lux_thres_hi_onchip == threshold_hi &&
 322             chip->lux_thres_lo_onchip == threshold_lo)
 323                 return 0;
 324 
 325         chip->lux_thres_hi_onchip = threshold_hi;
 326         chip->lux_thres_lo_onchip = threshold_lo;
 327 
 328         data[0] = threshold_hi;
 329         data[1] = threshold_hi >> 8;
 330         data[2] = threshold_lo;
 331         data[3] = threshold_lo >> 8;
 332 
 333         ret = i2c_smbus_write_i2c_block_data(chip->client,
 334                                         BH1770_ALS_TH_UP_0,
 335                                         ARRAY_SIZE(data),
 336                                         data);
 337         return ret;
 338 }
 339 
 340 static int bh1770_lux_get_result(struct bh1770_chip *chip)
 341 {
 342         u16 data;
 343         int ret;
 344 
 345         ret = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_DATA_0);
 346         if (ret < 0)
 347                 return ret;
 348 
 349         data = ret & 0xff;
 350         ret = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_DATA_1);
 351         if (ret < 0)
 352                 return ret;
 353 
 354         chip->lux_data_raw = data | ((ret & 0xff) << 8);
 355 
 356         return 0;
 357 }
 358 
 359 /* Calculate correction value which contains chip and device specific parts */
 360 static u32 bh1770_get_corr_value(struct bh1770_chip *chip)
 361 {
 362         u32 tmp;
 363         /* Impact of glass attenuation correction */
 364         tmp = (BH1770_LUX_CORR_SCALE * chip->lux_ga) / BH1770_LUX_GA_SCALE;
 365         /* Impact of chip factor correction */
 366         tmp = (tmp * chip->lux_cf) / BH1770_LUX_CF_SCALE;
 367         /* Impact of Device specific calibration correction */
 368         tmp = (tmp * chip->lux_calib) / BH1770_CALIB_SCALER;
 369         return tmp;
 370 }
 371 
 372 static int bh1770_lux_read_result(struct bh1770_chip *chip)
 373 {
 374         bh1770_lux_get_result(chip);
 375         return bh1770_lux_raw_to_adjusted(chip, chip->lux_data_raw);
 376 }
 377 
 378 /*
 379  * Chip on / off functions are called while keeping mutex except probe
 380  * or remove phase
 381  */
 382 static int bh1770_chip_on(struct bh1770_chip *chip)
 383 {
 384         int ret = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
 385                                         chip->regs);
 386         if (ret < 0)
 387                 return ret;
 388 
 389         usleep_range(BH1770_STARTUP_DELAY, BH1770_STARTUP_DELAY * 2);
 390 
 391         /* Reset the chip */
 392         i2c_smbus_write_byte_data(chip->client, BH1770_ALS_CONTROL,
 393                                 BH1770_SWRESET);
 394         usleep_range(BH1770_RESET_TIME, BH1770_RESET_TIME * 2);
 395 
 396         /*
 397          * ALS is started always since proximity needs als results
 398          * for realibility estimation.
 399          * Let's assume dark until the first ALS measurement is ready.
 400          */
 401         chip->lux_data_raw = 0;
 402         chip->prox_data = 0;
 403         ret = i2c_smbus_write_byte_data(chip->client,
 404                                         BH1770_ALS_CONTROL, BH1770_STANDALONE);
 405 
 406         /* Assume reset defaults */
 407         chip->lux_thres_hi_onchip = BH1770_LUX_RANGE;
 408         chip->lux_thres_lo_onchip = 0;
 409 
 410         return ret;
 411 }
 412 
 413 static void bh1770_chip_off(struct bh1770_chip *chip)
 414 {
 415         i2c_smbus_write_byte_data(chip->client,
 416                                         BH1770_INTERRUPT, BH1770_DISABLE);
 417         i2c_smbus_write_byte_data(chip->client,
 418                                 BH1770_ALS_CONTROL, BH1770_STANDBY);
 419         i2c_smbus_write_byte_data(chip->client,
 420                                 BH1770_PS_CONTROL, BH1770_STANDBY);
 421         regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
 422 }
 423 
 424 /* chip->mutex is kept when this is called */
 425 static int bh1770_prox_mode_control(struct bh1770_chip *chip)
 426 {
 427         if (chip->prox_enable_count) {
 428                 chip->prox_force_update = true; /* Force immediate update */
 429 
 430                 bh1770_lux_rate(chip, chip->lux_rate_index);
 431                 bh1770_prox_set_threshold(chip);
 432                 bh1770_led_cfg(chip);
 433                 bh1770_prox_rate(chip, PROX_BELOW_THRESHOLD);
 434                 bh1770_prox_interrupt_control(chip, BH1770_ENABLE);
 435                 i2c_smbus_write_byte_data(chip->client,
 436                                         BH1770_PS_CONTROL, BH1770_STANDALONE);
 437         } else {
 438                 chip->prox_data = 0;
 439                 bh1770_lux_rate(chip, chip->lux_rate_index);
 440                 bh1770_prox_interrupt_control(chip, BH1770_DISABLE);
 441                 i2c_smbus_write_byte_data(chip->client,
 442                                         BH1770_PS_CONTROL, BH1770_STANDBY);
 443         }
 444         return 0;
 445 }
 446 
 447 /* chip->mutex is kept when this is called */
 448 static int bh1770_prox_read_result(struct bh1770_chip *chip)
 449 {
 450         int ret;
 451         bool above;
 452         u8 mode;
 453 
 454         ret = i2c_smbus_read_byte_data(chip->client, BH1770_PS_DATA_LED1);
 455         if (ret < 0)
 456                 goto out;
 457 
 458         if (ret > chip->prox_threshold_hw)
 459                 above = true;
 460         else
 461                 above = false;
 462 
 463         /*
 464          * when ALS levels goes above limit, proximity result may be
 465          * false proximity. Thus ignore the result. With real proximity
 466          * there is a shadow causing low als levels.
 467          */
 468         if (chip->lux_data_raw > PROX_IGNORE_LUX_LIMIT)
 469                 ret = 0;
 470 
 471         chip->prox_data = bh1770_psraw_to_adjusted(chip, ret);
 472 
 473         /* Strong proximity level or force mode requires immediate response */
 474         if (chip->prox_data >= chip->prox_abs_thres ||
 475             chip->prox_force_update)
 476                 chip->prox_persistence_counter = chip->prox_persistence;
 477 
 478         chip->prox_force_update = false;
 479 
 480         /* Persistence filttering to reduce false proximity events */
 481         if (likely(above)) {
 482                 if (chip->prox_persistence_counter < chip->prox_persistence) {
 483                         chip->prox_persistence_counter++;
 484                         ret = -ENODATA;
 485                 } else {
 486                         mode = PROX_ABOVE_THRESHOLD;
 487                         ret = 0;
 488                 }
 489         } else {
 490                 chip->prox_persistence_counter = 0;
 491                 mode = PROX_BELOW_THRESHOLD;
 492                 chip->prox_data = 0;
 493                 ret = 0;
 494         }
 495 
 496         /* Set proximity detection rate based on above or below value */
 497         if (ret == 0) {
 498                 bh1770_prox_rate(chip, mode);
 499                 sysfs_notify(&chip->client->dev.kobj, NULL, "prox0_raw");
 500         }
 501 out:
 502         return ret;
 503 }
 504 
 505 static int bh1770_detect(struct bh1770_chip *chip)
 506 {
 507         struct i2c_client *client = chip->client;
 508         s32 ret;
 509         u8 manu, part;
 510 
 511         ret = i2c_smbus_read_byte_data(client, BH1770_MANUFACT_ID);
 512         if (ret < 0)
 513                 goto error;
 514         manu = (u8)ret;
 515 
 516         ret = i2c_smbus_read_byte_data(client, BH1770_PART_ID);
 517         if (ret < 0)
 518                 goto error;
 519         part = (u8)ret;
 520 
 521         chip->revision = (part & BH1770_REV_MASK) >> BH1770_REV_SHIFT;
 522         chip->prox_coef = BH1770_COEF_SCALER;
 523         chip->prox_const = 0;
 524         chip->lux_cf = BH1770_NEUTRAL_CF;
 525 
 526         if ((manu == BH1770_MANUFACT_ROHM) &&
 527             ((part & BH1770_PART_MASK) == BH1770_PART)) {
 528                 snprintf(chip->chipname, sizeof(chip->chipname), "BH1770GLC");
 529                 return 0;
 530         }
 531 
 532         if ((manu == BH1770_MANUFACT_OSRAM) &&
 533             ((part & BH1770_PART_MASK) == BH1770_PART)) {
 534                 snprintf(chip->chipname, sizeof(chip->chipname), "SFH7770");
 535                 /* Values selected by comparing different versions */
 536                 chip->prox_coef = 819; /* 0.8 * BH1770_COEF_SCALER */
 537                 chip->prox_const = 40;
 538                 return 0;
 539         }
 540 
 541         ret = -ENODEV;
 542 error:
 543         dev_dbg(&client->dev, "BH1770 or SFH7770 not found\n");
 544 
 545         return ret;
 546 }
 547 
 548 /*
 549  * This work is re-scheduled at every proximity interrupt.
 550  * If this work is running, it means that there hasn't been any
 551  * proximity interrupt in time. Situation is handled as no-proximity.
 552  * It would be nice to have low-threshold interrupt or interrupt
 553  * when measurement and hi-threshold are both 0. But neither of those exists.
 554  * This is a workaroud for missing HW feature.
 555  */
 556 
 557 static void bh1770_prox_work(struct work_struct *work)
 558 {
 559         struct bh1770_chip *chip =
 560                 container_of(work, struct bh1770_chip, prox_work.work);
 561 
 562         mutex_lock(&chip->mutex);
 563         bh1770_prox_read_result(chip);
 564         mutex_unlock(&chip->mutex);
 565 }
 566 
 567 /* This is threaded irq handler */
 568 static irqreturn_t bh1770_irq(int irq, void *data)
 569 {
 570         struct bh1770_chip *chip = data;
 571         int status;
 572         int rate = 0;
 573 
 574         mutex_lock(&chip->mutex);
 575         status = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_PS_STATUS);
 576 
 577         /* Acknowledge interrupt by reading this register */
 578         i2c_smbus_read_byte_data(chip->client, BH1770_INTERRUPT);
 579 
 580         /*
 581          * Check if there is fresh data available for als.
 582          * If this is the very first data, update thresholds after that.
 583          */
 584         if (status & BH1770_INT_ALS_DATA) {
 585                 bh1770_lux_get_result(chip);
 586                 if (unlikely(chip->lux_wait_result)) {
 587                         chip->lux_wait_result = false;
 588                         wake_up(&chip->wait);
 589                         bh1770_lux_update_thresholds(chip,
 590                                                 chip->lux_threshold_hi,
 591                                                 chip->lux_threshold_lo);
 592                 }
 593         }
 594 
 595         /* Disable interrupt logic to guarantee acknowledgement */
 596         i2c_smbus_write_byte_data(chip->client, BH1770_INTERRUPT,
 597                                   (0 << 1) | (0 << 0));
 598 
 599         if ((status & BH1770_INT_ALS_INT))
 600                 sysfs_notify(&chip->client->dev.kobj, NULL, "lux0_input");
 601 
 602         if (chip->int_mode_prox && (status & BH1770_INT_LEDS_INT)) {
 603                 rate = prox_rates_ms[chip->prox_rate_threshold];
 604                 bh1770_prox_read_result(chip);
 605         }
 606 
 607         /* Re-enable interrupt logic */
 608         i2c_smbus_write_byte_data(chip->client, BH1770_INTERRUPT,
 609                                   (chip->int_mode_lux << 1) |
 610                                   (chip->int_mode_prox << 0));
 611         mutex_unlock(&chip->mutex);
 612 
 613         /*
 614          * Can't cancel work while keeping mutex since the work uses the
 615          * same mutex.
 616          */
 617         if (rate) {
 618                 /*
 619                  * Simulate missing no-proximity interrupt 50ms after the
 620                  * next expected interrupt time.
 621                  */
 622                 cancel_delayed_work_sync(&chip->prox_work);
 623                 schedule_delayed_work(&chip->prox_work,
 624                                 msecs_to_jiffies(rate + 50));
 625         }
 626         return IRQ_HANDLED;
 627 }
 628 
 629 static ssize_t bh1770_power_state_store(struct device *dev,
 630                                       struct device_attribute *attr,
 631                                       const char *buf, size_t count)
 632 {
 633         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 634         unsigned long value;
 635         ssize_t ret;
 636 
 637         ret = kstrtoul(buf, 0, &value);
 638         if (ret)
 639                 return ret;
 640 
 641         mutex_lock(&chip->mutex);
 642         if (value) {
 643                 pm_runtime_get_sync(dev);
 644 
 645                 ret = bh1770_lux_rate(chip, chip->lux_rate_index);
 646                 if (ret < 0) {
 647                         pm_runtime_put(dev);
 648                         goto leave;
 649                 }
 650 
 651                 ret = bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
 652                 if (ret < 0) {
 653                         pm_runtime_put(dev);
 654                         goto leave;
 655                 }
 656 
 657                 /* This causes interrupt after the next measurement cycle */
 658                 bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
 659                                         BH1770_LUX_DEF_THRES);
 660                 /* Inform that we are waiting for a result from ALS */
 661                 chip->lux_wait_result = true;
 662                 bh1770_prox_mode_control(chip);
 663         } else if (!pm_runtime_suspended(dev)) {
 664                 pm_runtime_put(dev);
 665         }
 666         ret = count;
 667 leave:
 668         mutex_unlock(&chip->mutex);
 669         return ret;
 670 }
 671 
 672 static ssize_t bh1770_power_state_show(struct device *dev,
 673                                    struct device_attribute *attr, char *buf)
 674 {
 675         return sprintf(buf, "%d\n", !pm_runtime_suspended(dev));
 676 }
 677 
 678 static ssize_t bh1770_lux_result_show(struct device *dev,
 679                                    struct device_attribute *attr, char *buf)
 680 {
 681         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 682         ssize_t ret;
 683         long timeout;
 684 
 685         if (pm_runtime_suspended(dev))
 686                 return -EIO; /* Chip is not enabled at all */
 687 
 688         timeout = wait_event_interruptible_timeout(chip->wait,
 689                                         !chip->lux_wait_result,
 690                                         msecs_to_jiffies(BH1770_TIMEOUT));
 691         if (!timeout)
 692                 return -EIO;
 693 
 694         mutex_lock(&chip->mutex);
 695         ret = sprintf(buf, "%d\n", bh1770_lux_read_result(chip));
 696         mutex_unlock(&chip->mutex);
 697 
 698         return ret;
 699 }
 700 
 701 static ssize_t bh1770_lux_range_show(struct device *dev,
 702                                    struct device_attribute *attr, char *buf)
 703 {
 704         return sprintf(buf, "%d\n", BH1770_LUX_RANGE);
 705 }
 706 
 707 static ssize_t bh1770_prox_enable_store(struct device *dev,
 708                                       struct device_attribute *attr,
 709                                       const char *buf, size_t count)
 710 {
 711         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 712         unsigned long value;
 713         int ret;
 714 
 715         ret = kstrtoul(buf, 0, &value);
 716         if (ret)
 717                 return ret;
 718 
 719         mutex_lock(&chip->mutex);
 720         /* Assume no proximity. Sensor will tell real state soon */
 721         if (!chip->prox_enable_count)
 722                 chip->prox_data = 0;
 723 
 724         if (value)
 725                 chip->prox_enable_count++;
 726         else if (chip->prox_enable_count > 0)
 727                 chip->prox_enable_count--;
 728         else
 729                 goto leave;
 730 
 731         /* Run control only when chip is powered on */
 732         if (!pm_runtime_suspended(dev))
 733                 bh1770_prox_mode_control(chip);
 734 leave:
 735         mutex_unlock(&chip->mutex);
 736         return count;
 737 }
 738 
 739 static ssize_t bh1770_prox_enable_show(struct device *dev,
 740                                    struct device_attribute *attr, char *buf)
 741 {
 742         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 743         ssize_t len;
 744 
 745         mutex_lock(&chip->mutex);
 746         len = sprintf(buf, "%d\n", chip->prox_enable_count);
 747         mutex_unlock(&chip->mutex);
 748         return len;
 749 }
 750 
 751 static ssize_t bh1770_prox_result_show(struct device *dev,
 752                                    struct device_attribute *attr, char *buf)
 753 {
 754         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 755         ssize_t ret;
 756 
 757         mutex_lock(&chip->mutex);
 758         if (chip->prox_enable_count && !pm_runtime_suspended(dev))
 759                 ret = sprintf(buf, "%d\n", chip->prox_data);
 760         else
 761                 ret = -EIO;
 762         mutex_unlock(&chip->mutex);
 763         return ret;
 764 }
 765 
 766 static ssize_t bh1770_prox_range_show(struct device *dev,
 767                                    struct device_attribute *attr, char *buf)
 768 {
 769         return sprintf(buf, "%d\n", BH1770_PROX_RANGE);
 770 }
 771 
 772 static ssize_t bh1770_get_prox_rate_avail(struct device *dev,
 773                                    struct device_attribute *attr, char *buf)
 774 {
 775         int i;
 776         int pos = 0;
 777         for (i = 0; i < ARRAY_SIZE(prox_rates_hz); i++)
 778                 pos += sprintf(buf + pos, "%d ", prox_rates_hz[i]);
 779         sprintf(buf + pos - 1, "\n");
 780         return pos;
 781 }
 782 
 783 static ssize_t bh1770_get_prox_rate_above(struct device *dev,
 784                                    struct device_attribute *attr, char *buf)
 785 {
 786         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 787         return sprintf(buf, "%d\n", prox_rates_hz[chip->prox_rate_threshold]);
 788 }
 789 
 790 static ssize_t bh1770_get_prox_rate_below(struct device *dev,
 791                                    struct device_attribute *attr, char *buf)
 792 {
 793         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 794         return sprintf(buf, "%d\n", prox_rates_hz[chip->prox_rate]);
 795 }
 796 
 797 static int bh1770_prox_rate_validate(int rate)
 798 {
 799         int i;
 800 
 801         for (i = 0; i < ARRAY_SIZE(prox_rates_hz) - 1; i++)
 802                 if (rate >= prox_rates_hz[i])
 803                         break;
 804         return i;
 805 }
 806 
 807 static ssize_t bh1770_set_prox_rate_above(struct device *dev,
 808                                         struct device_attribute *attr,
 809                                         const char *buf, size_t count)
 810 {
 811         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 812         unsigned long value;
 813         int ret;
 814 
 815         ret = kstrtoul(buf, 0, &value);
 816         if (ret)
 817                 return ret;
 818 
 819         mutex_lock(&chip->mutex);
 820         chip->prox_rate_threshold = bh1770_prox_rate_validate(value);
 821         mutex_unlock(&chip->mutex);
 822         return count;
 823 }
 824 
 825 static ssize_t bh1770_set_prox_rate_below(struct device *dev,
 826                                         struct device_attribute *attr,
 827                                         const char *buf, size_t count)
 828 {
 829         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 830         unsigned long value;
 831         int ret;
 832 
 833         ret = kstrtoul(buf, 0, &value);
 834         if (ret)
 835                 return ret;
 836 
 837         mutex_lock(&chip->mutex);
 838         chip->prox_rate = bh1770_prox_rate_validate(value);
 839         mutex_unlock(&chip->mutex);
 840         return count;
 841 }
 842 
 843 static ssize_t bh1770_get_prox_thres(struct device *dev,
 844                                    struct device_attribute *attr, char *buf)
 845 {
 846         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 847         return sprintf(buf, "%d\n", chip->prox_threshold);
 848 }
 849 
 850 static ssize_t bh1770_set_prox_thres(struct device *dev,
 851                                       struct device_attribute *attr,
 852                                       const char *buf, size_t count)
 853 {
 854         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 855         unsigned long value;
 856         int ret;
 857 
 858         ret = kstrtoul(buf, 0, &value);
 859         if (ret)
 860                 return ret;
 861 
 862         if (value > BH1770_PROX_RANGE)
 863                 return -EINVAL;
 864 
 865         mutex_lock(&chip->mutex);
 866         chip->prox_threshold = value;
 867         ret = bh1770_prox_set_threshold(chip);
 868         mutex_unlock(&chip->mutex);
 869         if (ret < 0)
 870                 return ret;
 871         return count;
 872 }
 873 
 874 static ssize_t bh1770_prox_persistence_show(struct device *dev,
 875                                  struct device_attribute *attr, char *buf)
 876 {
 877         struct bh1770_chip *chip = dev_get_drvdata(dev);
 878 
 879         return sprintf(buf, "%u\n", chip->prox_persistence);
 880 }
 881 
 882 static ssize_t bh1770_prox_persistence_store(struct device *dev,
 883                                 struct device_attribute *attr,
 884                                 const char *buf, size_t len)
 885 {
 886         struct bh1770_chip *chip = dev_get_drvdata(dev);
 887         unsigned long value;
 888         int ret;
 889 
 890         ret = kstrtoul(buf, 0, &value);
 891         if (ret)
 892                 return ret;
 893 
 894         if (value > BH1770_PROX_MAX_PERSISTENCE)
 895                 return -EINVAL;
 896 
 897         chip->prox_persistence = value;
 898 
 899         return len;
 900 }
 901 
 902 static ssize_t bh1770_prox_abs_thres_show(struct device *dev,
 903                                  struct device_attribute *attr, char *buf)
 904 {
 905         struct bh1770_chip *chip = dev_get_drvdata(dev);
 906         return sprintf(buf, "%u\n", chip->prox_abs_thres);
 907 }
 908 
 909 static ssize_t bh1770_prox_abs_thres_store(struct device *dev,
 910                                 struct device_attribute *attr,
 911                                 const char *buf, size_t len)
 912 {
 913         struct bh1770_chip *chip = dev_get_drvdata(dev);
 914         unsigned long value;
 915         int ret;
 916 
 917         ret = kstrtoul(buf, 0, &value);
 918         if (ret)
 919                 return ret;
 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         int ret;
 963 
 964         ret = kstrtoul(buf, 0, &value);
 965         if (ret)
 966                 return ret;
 967 
 968         mutex_lock(&chip->mutex);
 969         old_calib = chip->lux_calib;
 970         chip->lux_calib = value;
 971         new_corr = bh1770_get_corr_value(chip);
 972         if (new_corr == 0) {
 973                 chip->lux_calib = old_calib;
 974                 mutex_unlock(&chip->mutex);
 975                 return -EINVAL;
 976         }
 977         chip->lux_corr = new_corr;
 978         /* Refresh thresholds on HW after changing correction value */
 979         bh1770_lux_update_thresholds(chip, chip->lux_threshold_hi,
 980                                 chip->lux_threshold_lo);
 981 
 982         mutex_unlock(&chip->mutex);
 983 
 984         return len;
 985 }
 986 
 987 static ssize_t bh1770_get_lux_rate_avail(struct device *dev,
 988                                    struct device_attribute *attr, char *buf)
 989 {
 990         int i;
 991         int pos = 0;
 992         for (i = 0; i < ARRAY_SIZE(lux_rates_hz); i++)
 993                 pos += sprintf(buf + pos, "%d ", lux_rates_hz[i]);
 994         sprintf(buf + pos - 1, "\n");
 995         return pos;
 996 }
 997 
 998 static ssize_t bh1770_get_lux_rate(struct device *dev,
 999                                    struct device_attribute *attr, char *buf)
1000 {
1001         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1002         return sprintf(buf, "%d\n", lux_rates_hz[chip->lux_rate_index]);
1003 }
1004 
1005 static ssize_t bh1770_set_lux_rate(struct device *dev,
1006                                       struct device_attribute *attr,
1007                                       const char *buf, size_t count)
1008 {
1009         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1010         unsigned long rate_hz;
1011         int ret, i;
1012 
1013         ret = kstrtoul(buf, 0, &rate_hz);
1014         if (ret)
1015                 return ret;
1016 
1017         for (i = 0; i < ARRAY_SIZE(lux_rates_hz) - 1; i++)
1018                 if (rate_hz >= lux_rates_hz[i])
1019                         break;
1020 
1021         mutex_lock(&chip->mutex);
1022         chip->lux_rate_index = i;
1023         ret = bh1770_lux_rate(chip, i);
1024         mutex_unlock(&chip->mutex);
1025 
1026         if (ret < 0)
1027                 return ret;
1028 
1029         return count;
1030 }
1031 
1032 static ssize_t bh1770_get_lux_thresh_above(struct device *dev,
1033                                    struct device_attribute *attr, char *buf)
1034 {
1035         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1036         return sprintf(buf, "%d\n", chip->lux_threshold_hi);
1037 }
1038 
1039 static ssize_t bh1770_get_lux_thresh_below(struct device *dev,
1040                                    struct device_attribute *attr, char *buf)
1041 {
1042         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1043         return sprintf(buf, "%d\n", chip->lux_threshold_lo);
1044 }
1045 
1046 static ssize_t bh1770_set_lux_thresh(struct bh1770_chip *chip, u16 *target,
1047                                 const char *buf)
1048 {
1049         unsigned long thresh;
1050         int ret;
1051 
1052         ret = kstrtoul(buf, 0, &thresh);
1053         if (ret)
1054                 return ret;
1055 
1056         if (thresh > BH1770_LUX_RANGE)
1057                 return -EINVAL;
1058 
1059         mutex_lock(&chip->mutex);
1060         *target = thresh;
1061         /*
1062          * Don't update values in HW if we are still waiting for
1063          * first interrupt to come after device handle open call.
1064          */
1065         if (!chip->lux_wait_result)
1066                 ret = bh1770_lux_update_thresholds(chip,
1067                                                 chip->lux_threshold_hi,
1068                                                 chip->lux_threshold_lo);
1069         mutex_unlock(&chip->mutex);
1070         return ret;
1071 
1072 }
1073 
1074 static ssize_t bh1770_set_lux_thresh_above(struct device *dev,
1075                                   struct device_attribute *attr,
1076                                   const char *buf, size_t len)
1077 {
1078         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1079         int ret = bh1770_set_lux_thresh(chip, &chip->lux_threshold_hi, buf);
1080         if (ret < 0)
1081                 return ret;
1082         return len;
1083 }
1084 
1085 static ssize_t bh1770_set_lux_thresh_below(struct device *dev,
1086                                   struct device_attribute *attr,
1087                                   const char *buf, size_t len)
1088 {
1089         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1090         int ret = bh1770_set_lux_thresh(chip, &chip->lux_threshold_lo, buf);
1091         if (ret < 0)
1092                 return ret;
1093         return len;
1094 }
1095 
1096 static DEVICE_ATTR(prox0_raw_en, S_IRUGO | S_IWUSR, bh1770_prox_enable_show,
1097                                                 bh1770_prox_enable_store);
1098 static DEVICE_ATTR(prox0_thresh_above1_value, S_IRUGO | S_IWUSR,
1099                                                 bh1770_prox_abs_thres_show,
1100                                                 bh1770_prox_abs_thres_store);
1101 static DEVICE_ATTR(prox0_thresh_above0_value, S_IRUGO | S_IWUSR,
1102                                                 bh1770_get_prox_thres,
1103                                                 bh1770_set_prox_thres);
1104 static DEVICE_ATTR(prox0_raw, S_IRUGO, bh1770_prox_result_show, NULL);
1105 static DEVICE_ATTR(prox0_sensor_range, S_IRUGO, bh1770_prox_range_show, NULL);
1106 static DEVICE_ATTR(prox0_thresh_above_count, S_IRUGO | S_IWUSR,
1107                                                 bh1770_prox_persistence_show,
1108                                                 bh1770_prox_persistence_store);
1109 static DEVICE_ATTR(prox0_rate_above, S_IRUGO | S_IWUSR,
1110                                                 bh1770_get_prox_rate_above,
1111                                                 bh1770_set_prox_rate_above);
1112 static DEVICE_ATTR(prox0_rate_below, S_IRUGO | S_IWUSR,
1113                                                 bh1770_get_prox_rate_below,
1114                                                 bh1770_set_prox_rate_below);
1115 static DEVICE_ATTR(prox0_rate_avail, S_IRUGO, bh1770_get_prox_rate_avail, NULL);
1116 
1117 static DEVICE_ATTR(lux0_calibscale, S_IRUGO | S_IWUSR, bh1770_lux_calib_show,
1118                                                 bh1770_lux_calib_store);
1119 static DEVICE_ATTR(lux0_calibscale_default, S_IRUGO,
1120                                                 bh1770_lux_calib_default_show,
1121                                                 NULL);
1122 static DEVICE_ATTR(lux0_input, S_IRUGO, bh1770_lux_result_show, NULL);
1123 static DEVICE_ATTR(lux0_sensor_range, S_IRUGO, bh1770_lux_range_show, NULL);
1124 static DEVICE_ATTR(lux0_rate, S_IRUGO | S_IWUSR, bh1770_get_lux_rate,
1125                                                 bh1770_set_lux_rate);
1126 static DEVICE_ATTR(lux0_rate_avail, S_IRUGO, bh1770_get_lux_rate_avail, NULL);
1127 static DEVICE_ATTR(lux0_thresh_above_value, S_IRUGO | S_IWUSR,
1128                                                 bh1770_get_lux_thresh_above,
1129                                                 bh1770_set_lux_thresh_above);
1130 static DEVICE_ATTR(lux0_thresh_below_value, S_IRUGO | S_IWUSR,
1131                                                 bh1770_get_lux_thresh_below,
1132                                                 bh1770_set_lux_thresh_below);
1133 static DEVICE_ATTR(chip_id, S_IRUGO, bh1770_chip_id_show, NULL);
1134 static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR, bh1770_power_state_show,
1135                                                  bh1770_power_state_store);
1136 
1137 
1138 static struct attribute *sysfs_attrs[] = {
1139         &dev_attr_lux0_calibscale.attr,
1140         &dev_attr_lux0_calibscale_default.attr,
1141         &dev_attr_lux0_input.attr,
1142         &dev_attr_lux0_sensor_range.attr,
1143         &dev_attr_lux0_rate.attr,
1144         &dev_attr_lux0_rate_avail.attr,
1145         &dev_attr_lux0_thresh_above_value.attr,
1146         &dev_attr_lux0_thresh_below_value.attr,
1147         &dev_attr_prox0_raw.attr,
1148         &dev_attr_prox0_sensor_range.attr,
1149         &dev_attr_prox0_raw_en.attr,
1150         &dev_attr_prox0_thresh_above_count.attr,
1151         &dev_attr_prox0_rate_above.attr,
1152         &dev_attr_prox0_rate_below.attr,
1153         &dev_attr_prox0_rate_avail.attr,
1154         &dev_attr_prox0_thresh_above0_value.attr,
1155         &dev_attr_prox0_thresh_above1_value.attr,
1156         &dev_attr_chip_id.attr,
1157         &dev_attr_power_state.attr,
1158         NULL
1159 };
1160 
1161 static const struct attribute_group bh1770_attribute_group = {
1162         .attrs = sysfs_attrs
1163 };
1164 
1165 static int bh1770_probe(struct i2c_client *client,
1166                                 const struct i2c_device_id *id)
1167 {
1168         struct bh1770_chip *chip;
1169         int err;
1170 
1171         chip = devm_kzalloc(&client->dev, sizeof *chip, GFP_KERNEL);
1172         if (!chip)
1173                 return -ENOMEM;
1174 
1175         i2c_set_clientdata(client, chip);
1176         chip->client  = client;
1177 
1178         mutex_init(&chip->mutex);
1179         init_waitqueue_head(&chip->wait);
1180         INIT_DELAYED_WORK(&chip->prox_work, bh1770_prox_work);
1181 
1182         if (client->dev.platform_data == NULL) {
1183                 dev_err(&client->dev, "platform data is mandatory\n");
1184                 return -EINVAL;
1185         }
1186 
1187         chip->pdata             = client->dev.platform_data;
1188         chip->lux_calib         = BH1770_LUX_NEUTRAL_CALIB_VALUE;
1189         chip->lux_rate_index    = BH1770_LUX_DEFAULT_RATE;
1190         chip->lux_threshold_lo  = BH1770_LUX_DEF_THRES;
1191         chip->lux_threshold_hi  = BH1770_LUX_DEF_THRES;
1192 
1193         if (chip->pdata->glass_attenuation == 0)
1194                 chip->lux_ga = BH1770_NEUTRAL_GA;
1195         else
1196                 chip->lux_ga = chip->pdata->glass_attenuation;
1197 
1198         chip->prox_threshold    = BH1770_PROX_DEF_THRES;
1199         chip->prox_led          = chip->pdata->led_def_curr;
1200         chip->prox_abs_thres    = BH1770_PROX_DEF_ABS_THRES;
1201         chip->prox_persistence  = BH1770_DEFAULT_PERSISTENCE;
1202         chip->prox_rate_threshold = BH1770_PROX_DEF_RATE_THRESH;
1203         chip->prox_rate         = BH1770_PROX_DEFAULT_RATE;
1204         chip->prox_data         = 0;
1205 
1206         chip->regs[0].supply = reg_vcc;
1207         chip->regs[1].supply = reg_vleds;
1208 
1209         err = devm_regulator_bulk_get(&client->dev,
1210                                       ARRAY_SIZE(chip->regs), chip->regs);
1211         if (err < 0) {
1212                 dev_err(&client->dev, "Cannot get regulators\n");
1213                 return err;
1214         }
1215 
1216         err = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
1217                                 chip->regs);
1218         if (err < 0) {
1219                 dev_err(&client->dev, "Cannot enable regulators\n");
1220                 return err;
1221         }
1222 
1223         usleep_range(BH1770_STARTUP_DELAY, BH1770_STARTUP_DELAY * 2);
1224         err = bh1770_detect(chip);
1225         if (err < 0)
1226                 goto fail0;
1227 
1228         /* Start chip */
1229         bh1770_chip_on(chip);
1230         pm_runtime_set_active(&client->dev);
1231         pm_runtime_enable(&client->dev);
1232 
1233         chip->lux_corr = bh1770_get_corr_value(chip);
1234         if (chip->lux_corr == 0) {
1235                 dev_err(&client->dev, "Improper correction values\n");
1236                 err = -EINVAL;
1237                 goto fail0;
1238         }
1239 
1240         if (chip->pdata->setup_resources) {
1241                 err = chip->pdata->setup_resources();
1242                 if (err) {
1243                         err = -EINVAL;
1244                         goto fail0;
1245                 }
1246         }
1247 
1248         err = sysfs_create_group(&chip->client->dev.kobj,
1249                                 &bh1770_attribute_group);
1250         if (err < 0) {
1251                 dev_err(&chip->client->dev, "Sysfs registration failed\n");
1252                 goto fail1;
1253         }
1254 
1255         /*
1256          * Chip needs level triggered interrupt to work. However,
1257          * level triggering doesn't work always correctly with power
1258          * management. Select both
1259          */
1260         err = request_threaded_irq(client->irq, NULL,
1261                                 bh1770_irq,
1262                                 IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
1263                                 IRQF_TRIGGER_LOW,
1264                                 "bh1770", chip);
1265         if (err) {
1266                 dev_err(&client->dev, "could not get IRQ %d\n",
1267                         client->irq);
1268                 goto fail2;
1269         }
1270         regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
1271         return err;
1272 fail2:
1273         sysfs_remove_group(&chip->client->dev.kobj,
1274                         &bh1770_attribute_group);
1275 fail1:
1276         if (chip->pdata->release_resources)
1277                 chip->pdata->release_resources();
1278 fail0:
1279         regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
1280         return err;
1281 }
1282 
1283 static int bh1770_remove(struct i2c_client *client)
1284 {
1285         struct bh1770_chip *chip = i2c_get_clientdata(client);
1286 
1287         free_irq(client->irq, chip);
1288 
1289         sysfs_remove_group(&chip->client->dev.kobj,
1290                         &bh1770_attribute_group);
1291 
1292         if (chip->pdata->release_resources)
1293                 chip->pdata->release_resources();
1294 
1295         cancel_delayed_work_sync(&chip->prox_work);
1296 
1297         if (!pm_runtime_suspended(&client->dev))
1298                 bh1770_chip_off(chip);
1299 
1300         pm_runtime_disable(&client->dev);
1301         pm_runtime_set_suspended(&client->dev);
1302 
1303         return 0;
1304 }
1305 
1306 #ifdef CONFIG_PM_SLEEP
1307 static int bh1770_suspend(struct device *dev)
1308 {
1309         struct i2c_client *client = to_i2c_client(dev);
1310         struct bh1770_chip *chip = i2c_get_clientdata(client);
1311 
1312         bh1770_chip_off(chip);
1313 
1314         return 0;
1315 }
1316 
1317 static int bh1770_resume(struct device *dev)
1318 {
1319         struct i2c_client *client = to_i2c_client(dev);
1320         struct bh1770_chip *chip = i2c_get_clientdata(client);
1321         int ret = 0;
1322 
1323         bh1770_chip_on(chip);
1324 
1325         if (!pm_runtime_suspended(dev)) {
1326                 /*
1327                  * If we were enabled at suspend time, it is expected
1328                  * everything works nice and smoothly
1329                  */
1330                 ret = bh1770_lux_rate(chip, chip->lux_rate_index);
1331                 ret |= bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
1332 
1333                 /* This causes interrupt after the next measurement cycle */
1334                 bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
1335                                         BH1770_LUX_DEF_THRES);
1336                 /* Inform that we are waiting for a result from ALS */
1337                 chip->lux_wait_result = true;
1338                 bh1770_prox_mode_control(chip);
1339         }
1340         return ret;
1341 }
1342 #endif
1343 
1344 #ifdef CONFIG_PM
1345 static int bh1770_runtime_suspend(struct device *dev)
1346 {
1347         struct i2c_client *client = to_i2c_client(dev);
1348         struct bh1770_chip *chip = i2c_get_clientdata(client);
1349 
1350         bh1770_chip_off(chip);
1351 
1352         return 0;
1353 }
1354 
1355 static int bh1770_runtime_resume(struct device *dev)
1356 {
1357         struct i2c_client *client = to_i2c_client(dev);
1358         struct bh1770_chip *chip = i2c_get_clientdata(client);
1359 
1360         bh1770_chip_on(chip);
1361 
1362         return 0;
1363 }
1364 #endif
1365 
1366 static const struct i2c_device_id bh1770_id[] = {
1367         {"bh1770glc", 0 },
1368         {"sfh7770", 0 },
1369         {}
1370 };
1371 
1372 MODULE_DEVICE_TABLE(i2c, bh1770_id);
1373 
1374 static const struct dev_pm_ops bh1770_pm_ops = {
1375         SET_SYSTEM_SLEEP_PM_OPS(bh1770_suspend, bh1770_resume)
1376         SET_RUNTIME_PM_OPS(bh1770_runtime_suspend, bh1770_runtime_resume, NULL)
1377 };
1378 
1379 static struct i2c_driver bh1770_driver = {
1380         .driver  = {
1381                 .name   = "bh1770glc",
1382                 .pm     = &bh1770_pm_ops,
1383         },
1384         .probe    = bh1770_probe,
1385         .remove   = bh1770_remove,
1386         .id_table = bh1770_id,
1387 };
1388 
1389 module_i2c_driver(bh1770_driver);
1390 
1391 MODULE_DESCRIPTION("BH1770GLC / SFH7770 combined ALS and proximity sensor");
1392 MODULE_AUTHOR("Samu Onkalo, Nokia Corporation");
1393 MODULE_LICENSE("GPL v2");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/misc/bh1770glc.c

DEFINITIONS
