drivers/misc/bh1770glc.c

   1 /*
   2  * This file is part of the ROHM BH1770GLC / OSRAM SFH7770 sensor driver.
   3  * Chip is combined proximity and ambient light sensor.
   4  *
   5  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
   6  *
   7  * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * version 2 as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  21  * 02110-1301 USA
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/i2c.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/mutex.h>
  30 #include <linux/i2c/bh1770glc.h>
  31 #include <linux/regulator/consumer.h>
  32 #include <linux/pm_runtime.h>
  33 #include <linux/workqueue.h>
  34 #include <linux/delay.h>
  35 #include <linux/wait.h>
  36 #include <linux/slab.h>
  37
  38 #define BH1770_ALS_CONTROL      0x80 /* ALS operation mode control */
  39 #define BH1770_PS_CONTROL       0x81 /* PS operation mode control */
  40 #define BH1770_I_LED            0x82 /* active LED and LED1, LED2 current */
  41 #define BH1770_I_LED3           0x83 /* LED3 current setting */
  42 #define BH1770_ALS_PS_MEAS      0x84 /* Forced mode trigger */
  43 #define BH1770_PS_MEAS_RATE     0x85 /* PS meas. rate at stand alone mode */
  44 #define BH1770_ALS_MEAS_RATE    0x86 /* ALS meas. rate at stand alone mode */
  45 #define BH1770_PART_ID          0x8a /* Part number and revision ID */
  46 #define BH1770_MANUFACT_ID      0x8b /* Manufacturerer ID */
  47 #define BH1770_ALS_DATA_0       0x8c /* ALS DATA low byte */
  48 #define BH1770_ALS_DATA_1       0x8d /* ALS DATA high byte */
  49 #define BH1770_ALS_PS_STATUS    0x8e /* Measurement data and int status */
  50 #define BH1770_PS_DATA_LED1     0x8f /* PS data from LED1 */
  51 #define BH1770_PS_DATA_LED2     0x90 /* PS data from LED2 */
  52 #define BH1770_PS_DATA_LED3     0x91 /* PS data from LED3 */
  53 #define BH1770_INTERRUPT        0x92 /* Interrupt setting */
  54 #define BH1770_PS_TH_LED1       0x93 /* PS interrupt threshold for LED1 */
  55 #define BH1770_PS_TH_LED2       0x94 /* PS interrupt threshold for LED2 */
  56 #define BH1770_PS_TH_LED3       0x95 /* PS interrupt threshold for LED3 */
  57 #define BH1770_ALS_TH_UP_0      0x96 /* ALS upper threshold low byte */
  58 #define BH1770_ALS_TH_UP_1      0x97 /* ALS upper threshold high byte */
  59 #define BH1770_ALS_TH_LOW_0     0x98 /* ALS lower threshold low byte */
  60 #define BH1770_ALS_TH_LOW_1     0x99 /* ALS lower threshold high byte */
  61
  62 /* MANUFACT_ID */
  63 #define BH1770_MANUFACT_ROHM    0x01
  64 #define BH1770_MANUFACT_OSRAM   0x03
  65
  66 /* PART_ID */
  67 #define BH1770_PART             0x90
  68 #define BH1770_PART_MASK        0xf0
  69 #define BH1770_REV_MASK         0x0f
  70 #define BH1770_REV_SHIFT        0
  71 #define BH1770_REV_0            0x00
  72 #define BH1770_REV_1            0x01
  73
  74 /* Operating modes for both */
  75 #define BH1770_STANDBY          0x00
  76 #define BH1770_FORCED           0x02
  77 #define BH1770_STANDALONE       0x03
  78 #define BH1770_SWRESET          (0x01 << 2)
  79
  80 #define BH1770_PS_TRIG_MEAS     (1 << 0)
  81 #define BH1770_ALS_TRIG_MEAS    (1 << 1)
  82
  83 /* Interrupt control */
  84 #define BH1770_INT_OUTPUT_MODE  (1 << 3) /* 0 = latched */
  85 #define BH1770_INT_POLARITY     (1 << 2) /* 1 = active high */
  86 #define BH1770_INT_ALS_ENA      (1 << 1)
  87 #define BH1770_INT_PS_ENA       (1 << 0)
  88
  89 /* Interrupt status */
  90 #define BH1770_INT_LED1_DATA    (1 << 0)
  91 #define BH1770_INT_LED1_INT     (1 << 1)
  92 #define BH1770_INT_LED2_DATA    (1 << 2)
  93 #define BH1770_INT_LED2_INT     (1 << 3)
  94 #define BH1770_INT_LED3_DATA    (1 << 4)
  95 #define BH1770_INT_LED3_INT     (1 << 5)
  96 #define BH1770_INT_LEDS_INT     ((1 << 1) | (1 << 3) | (1 << 5))
  97 #define BH1770_INT_ALS_DATA     (1 << 6)
  98 #define BH1770_INT_ALS_INT      (1 << 7)
  99
 100 /* Led channels */
 101 #define BH1770_LED1             0x00
 102
 103 #define BH1770_DISABLE          0
 104 #define BH1770_ENABLE           1
 105 #define BH1770_PROX_CHANNELS    1
 106
 107 #define BH1770_LUX_DEFAULT_RATE 1 /* Index to lux rate table */
 108 #define BH1770_PROX_DEFAULT_RATE 1 /* Direct HW value =~ 50Hz */
 109 #define BH1770_PROX_DEF_RATE_THRESH 6 /* Direct HW value =~ 5 Hz */
 110 #define BH1770_STARTUP_DELAY    50
 111 #define BH1770_RESET_TIME       10
 112 #define BH1770_TIMEOUT          2100 /* Timeout in 2.1 seconds */
 113
 114 #define BH1770_LUX_RANGE        65535
 115 #define BH1770_PROX_RANGE       255
 116 #define BH1770_COEF_SCALER      1024
 117 #define BH1770_CALIB_SCALER     8192
 118 #define BH1770_LUX_NEUTRAL_CALIB_VALUE (1 * BH1770_CALIB_SCALER)
 119 #define BH1770_LUX_DEF_THRES    1000
 120 #define BH1770_PROX_DEF_THRES   70
 121 #define BH1770_PROX_DEF_ABS_THRES   100
 122 #define BH1770_DEFAULT_PERSISTENCE  10
 123 #define BH1770_PROX_MAX_PERSISTENCE 50
 124 #define BH1770_LUX_GA_SCALE     16384
 125 #define BH1770_LUX_CF_SCALE     2048 /* CF ChipFactor */
 126 #define BH1770_NEUTRAL_CF       BH1770_LUX_CF_SCALE
 127 #define BH1770_LUX_CORR_SCALE   4096
 128
 129 #define PROX_ABOVE_THRESHOLD    1
 130 #define PROX_BELOW_THRESHOLD    0
 131
 132 #define PROX_IGNORE_LUX_LIMIT   500
 133
 134 struct bh1770_chip {
 135         struct bh1770_platform_data     *pdata;
 136         char                            chipname[10];
 137         u8                              revision;
 138         struct i2c_client               *client;
 139         struct regulator_bulk_data      regs[2];
 140         struct mutex                    mutex; /* avoid parallel access */
 141         wait_queue_head_t               wait;
 142
 143         bool                    int_mode_prox;
 144         bool                    int_mode_lux;
 145         struct delayed_work     prox_work;
 146         u32     lux_cf; /* Chip specific factor */
 147         u32     lux_ga;
 148         u32     lux_calib;
 149         int     lux_rate_index;
 150         u32     lux_corr;
 151         u16     lux_data_raw;
 152         u16     lux_threshold_hi;
 153         u16     lux_threshold_lo;
 154         u16     lux_thres_hi_onchip;
 155         u16     lux_thres_lo_onchip;
 156         bool    lux_wait_result;
 157
 158         int     prox_enable_count;
 159         u16     prox_coef;
 160         u16     prox_const;
 161         int     prox_rate;
 162         int     prox_rate_threshold;
 163         u8      prox_persistence;
 164         u8      prox_persistence_counter;
 165         u8      prox_data;
 166         u8      prox_threshold;
 167         u8      prox_threshold_hw;
 168         bool    prox_force_update;
 169         u8      prox_abs_thres;
 170         u8      prox_led;
 171 };
 172
 173 static const char reg_vcc[] = "Vcc";
 174 static const char reg_vleds[] = "Vleds";
 175
 176 /*
 177  * Supported stand alone rates in ms from chip data sheet
 178  * {10, 20, 30, 40, 70, 100, 200, 500, 1000, 2000};
 179  */
 180 static const s16 prox_rates_hz[] = {100, 50, 33, 25, 14, 10, 5, 2};
 181 static const s16 prox_rates_ms[] = {10, 20, 30, 40, 70, 100, 200, 500};
 182
 183 /* Supported IR-led currents in mA */
 184 static const u8 prox_curr_ma[] = {5, 10, 20, 50, 100, 150, 200};
 185
 186 /*
 187  * Supported stand alone rates in ms from chip data sheet
 188  * {100, 200, 500, 1000, 2000};
 189  */
 190 static const s16 lux_rates_hz[] = {10, 5, 2, 1, 0};
 191
 192 /*
 193  * interrupt control functions are called while keeping chip->mutex
 194  * excluding module probe / remove
 195  */
 196 static inline int bh1770_lux_interrupt_control(struct bh1770_chip *chip,
 197                                         int lux)
 198 {
 199         chip->int_mode_lux = lux;
 200         /* Set interrupt modes, interrupt active low, latched */
 201         return i2c_smbus_write_byte_data(chip->client,
 202                                         BH1770_INTERRUPT,
 203                                         (lux << 1) | chip->int_mode_prox);
 204 }
 205
 206 static inline int bh1770_prox_interrupt_control(struct bh1770_chip *chip,
 207                                         int ps)
 208 {
 209         chip->int_mode_prox = ps;
 210         return i2c_smbus_write_byte_data(chip->client,
 211                                         BH1770_INTERRUPT,
 212                                         (chip->int_mode_lux << 1) | (ps << 0));
 213 }
 214
 215 /* chip->mutex is always kept here */
 216 static int bh1770_lux_rate(struct bh1770_chip *chip, int rate_index)
 217 {
 218         /* sysfs may call this when the chip is powered off */
 219         if (pm_runtime_suspended(&chip->client->dev))
 220                 return 0;
 221
 222         /* Proper proximity response needs fastest lux rate (100ms) */
 223         if (chip->prox_enable_count)
 224                 rate_index = 0;
 225
 226         return i2c_smbus_write_byte_data(chip->client,
 227                                         BH1770_ALS_MEAS_RATE,
 228                                         rate_index);
 229 }
 230
 231 static int bh1770_prox_rate(struct bh1770_chip *chip, int mode)
 232 {
 233         int rate;
 234
 235         rate = (mode == PROX_ABOVE_THRESHOLD) ?
 236                 chip->prox_rate_threshold : chip->prox_rate;
 237
 238         return i2c_smbus_write_byte_data(chip->client,
 239                                         BH1770_PS_MEAS_RATE,
 240                                         rate);
 241 }
 242
 243 /* InfraredLED is controlled by the chip during proximity scanning */
 244 static inline int bh1770_led_cfg(struct bh1770_chip *chip)
 245 {
 246         /* LED cfg, current for leds 1 and 2 */
 247         return i2c_smbus_write_byte_data(chip->client,
 248                                         BH1770_I_LED,
 249                                         (BH1770_LED1 << 6) |
 250                                         (BH1770_LED_5mA << 3) |
 251                                         chip->prox_led);
 252 }
 253
 254 /*
 255  * Following two functions converts raw ps values from HW to normalized
 256  * values. Purpose is to compensate differences between different sensor
 257  * versions and variants so that result means about the same between
 258  * versions.
 259  */
 260 static inline u8 bh1770_psraw_to_adjusted(struct bh1770_chip *chip, u8 psraw)
 261 {
 262         u16 adjusted;
 263         adjusted = (u16)(((u32)(psraw + chip->prox_const) * chip->prox_coef) /
 264                 BH1770_COEF_SCALER);
 265         if (adjusted > BH1770_PROX_RANGE)
 266                 adjusted = BH1770_PROX_RANGE;
 267         return adjusted;
 268 }
 269
 270 static inline u8 bh1770_psadjusted_to_raw(struct bh1770_chip *chip, u8 ps)
 271 {
 272         u16 raw;
 273
 274         raw = (((u32)ps * BH1770_COEF_SCALER) / chip->prox_coef);
 275         if (raw > chip->prox_const)
 276                 raw = raw - chip->prox_const;
 277         else
 278                 raw = 0;
 279         return raw;
 280 }
 281
 282 /*
 283  * Following two functions converts raw lux values from HW to normalized
 284  * values. Purpose is to compensate differences between different sensor
 285  * versions and variants so that result means about the same between
 286  * versions. Chip->mutex is kept when this is called.
 287  */
 288 static int bh1770_prox_set_threshold(struct bh1770_chip *chip)
 289 {
 290         u8 tmp = 0;
 291
 292         /* sysfs may call this when the chip is powered off */
 293         if (pm_runtime_suspended(&chip->client->dev))
 294                 return 0;
 295
 296         tmp = bh1770_psadjusted_to_raw(chip, chip->prox_threshold);
 297         chip->prox_threshold_hw = tmp;
 298
 299         return  i2c_smbus_write_byte_data(chip->client, BH1770_PS_TH_LED1,
 300                                         tmp);
 301 }
 302
 303 static inline u16 bh1770_lux_raw_to_adjusted(struct bh1770_chip *chip, u16 raw)
 304 {
 305         u32 lux;
 306         lux = ((u32)raw * chip->lux_corr) / BH1770_LUX_CORR_SCALE;
 307         return min(lux, (u32)BH1770_LUX_RANGE);
 308 }
 309
 310 static inline u16 bh1770_lux_adjusted_to_raw(struct bh1770_chip *chip,
 311                                         u16 adjusted)
 312 {
 313         return (u32)adjusted * BH1770_LUX_CORR_SCALE / chip->lux_corr;
 314 }
 315
 316 /* chip->mutex is kept when this is called */
 317 static int bh1770_lux_update_thresholds(struct bh1770_chip *chip,
 318                                         u16 threshold_hi, u16 threshold_lo)
 319 {
 320         u8 data[4];
 321         int ret;
 322
 323         /* sysfs may call this when the chip is powered off */
 324         if (pm_runtime_suspended(&chip->client->dev))
 325                 return 0;
 326
 327         /*
 328          * Compensate threshold values with the correction factors if not
 329          * set to minimum or maximum.
 330          * Min & max values disables interrupts.
 331          */
 332         if (threshold_hi != BH1770_LUX_RANGE && threshold_hi != 0)
 333                 threshold_hi = bh1770_lux_adjusted_to_raw(chip, threshold_hi);
 334
 335         if (threshold_lo != BH1770_LUX_RANGE && threshold_lo != 0)
 336                 threshold_lo = bh1770_lux_adjusted_to_raw(chip, threshold_lo);
 337
 338         if (chip->lux_thres_hi_onchip == threshold_hi &&
 339             chip->lux_thres_lo_onchip == threshold_lo)
 340                 return 0;
 341
 342         chip->lux_thres_hi_onchip = threshold_hi;
 343         chip->lux_thres_lo_onchip = threshold_lo;
 344
 345         data[0] = threshold_hi;
 346         data[1] = threshold_hi >> 8;
 347         data[2] = threshold_lo;
 348         data[3] = threshold_lo >> 8;
 349
 350         ret = i2c_smbus_write_i2c_block_data(chip->client,
 351                                         BH1770_ALS_TH_UP_0,
 352                                         ARRAY_SIZE(data),
 353                                         data);
 354         return ret;
 355 }
 356
 357 static int bh1770_lux_get_result(struct bh1770_chip *chip)
 358 {
 359         u16 data;
 360         int ret;
 361
 362         ret = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_DATA_0);
 363         if (ret < 0)
 364                 return ret;
 365
 366         data = ret & 0xff;
 367         ret = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_DATA_1);
 368         if (ret < 0)
 369                 return ret;
 370
 371         chip->lux_data_raw = data | ((ret & 0xff) << 8);
 372
 373         return 0;
 374 }
 375
 376 /* Calculate correction value which contains chip and device specific parts */
 377 static u32 bh1770_get_corr_value(struct bh1770_chip *chip)
 378 {
 379         u32 tmp;
 380         /* Impact of glass attenuation correction */
 381         tmp = (BH1770_LUX_CORR_SCALE * chip->lux_ga) / BH1770_LUX_GA_SCALE;
 382         /* Impact of chip factor correction */
 383         tmp = (tmp * chip->lux_cf) / BH1770_LUX_CF_SCALE;
 384         /* Impact of Device specific calibration correction */
 385         tmp = (tmp * chip->lux_calib) / BH1770_CALIB_SCALER;
 386         return tmp;
 387 }
 388
 389 static int bh1770_lux_read_result(struct bh1770_chip *chip)
 390 {
 391         bh1770_lux_get_result(chip);
 392         return bh1770_lux_raw_to_adjusted(chip, chip->lux_data_raw);
 393 }
 394
 395 /*
 396  * Chip on / off functions are called while keeping mutex except probe
 397  * or remove phase
 398  */
 399 static int bh1770_chip_on(struct bh1770_chip *chip)
 400 {
 401         int ret = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
 402                                         chip->regs);
 403         if (ret < 0)
 404                 return ret;
 405
 406         usleep_range(BH1770_STARTUP_DELAY, BH1770_STARTUP_DELAY * 2);
 407
 408         /* Reset the chip */
 409         i2c_smbus_write_byte_data(chip->client, BH1770_ALS_CONTROL,
 410                                 BH1770_SWRESET);
 411         usleep_range(BH1770_RESET_TIME, BH1770_RESET_TIME * 2);
 412
 413         /*
 414          * ALS is started always since proximity needs als results
 415          * for realibility estimation.
 416          * Let's assume dark until the first ALS measurement is ready.
 417          */
 418         chip->lux_data_raw = 0;
 419         chip->prox_data = 0;
 420         ret = i2c_smbus_write_byte_data(chip->client,
 421                                         BH1770_ALS_CONTROL, BH1770_STANDALONE);
 422
 423         /* Assume reset defaults */
 424         chip->lux_thres_hi_onchip = BH1770_LUX_RANGE;
 425         chip->lux_thres_lo_onchip = 0;
 426
 427         return ret;
 428 }
 429
 430 static void bh1770_chip_off(struct bh1770_chip *chip)
 431 {
 432         i2c_smbus_write_byte_data(chip->client,
 433                                         BH1770_INTERRUPT, BH1770_DISABLE);
 434         i2c_smbus_write_byte_data(chip->client,
 435                                 BH1770_ALS_CONTROL, BH1770_STANDBY);
 436         i2c_smbus_write_byte_data(chip->client,
 437                                 BH1770_PS_CONTROL, BH1770_STANDBY);
 438         regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
 439 }
 440
 441 /* chip->mutex is kept when this is called */
 442 static int bh1770_prox_mode_control(struct bh1770_chip *chip)
 443 {
 444         if (chip->prox_enable_count) {
 445                 chip->prox_force_update = true; /* Force immediate update */
 446
 447                 bh1770_lux_rate(chip, chip->lux_rate_index);
 448                 bh1770_prox_set_threshold(chip);
 449                 bh1770_led_cfg(chip);
 450                 bh1770_prox_rate(chip, PROX_BELOW_THRESHOLD);
 451                 bh1770_prox_interrupt_control(chip, BH1770_ENABLE);
 452                 i2c_smbus_write_byte_data(chip->client,
 453                                         BH1770_PS_CONTROL, BH1770_STANDALONE);
 454         } else {
 455                 chip->prox_data = 0;
 456                 bh1770_lux_rate(chip, chip->lux_rate_index);
 457                 bh1770_prox_interrupt_control(chip, BH1770_DISABLE);
 458                 i2c_smbus_write_byte_data(chip->client,
 459                                         BH1770_PS_CONTROL, BH1770_STANDBY);
 460         }
 461         return 0;
 462 }
 463
 464 /* chip->mutex is kept when this is called */
 465 static int bh1770_prox_read_result(struct bh1770_chip *chip)
 466 {
 467         int ret;
 468         bool above;
 469         u8 mode;
 470
 471         ret = i2c_smbus_read_byte_data(chip->client, BH1770_PS_DATA_LED1);
 472         if (ret < 0)
 473                 goto out;
 474
 475         if (ret > chip->prox_threshold_hw)
 476                 above = true;
 477         else
 478                 above = false;
 479
 480         /*
 481          * when ALS levels goes above limit, proximity result may be
 482          * false proximity. Thus ignore the result. With real proximity
 483          * there is a shadow causing low als levels.
 484          */
 485         if (chip->lux_data_raw > PROX_IGNORE_LUX_LIMIT)
 486                 ret = 0;
 487
 488         chip->prox_data = bh1770_psraw_to_adjusted(chip, ret);
 489
 490         /* Strong proximity level or force mode requires immediate response */
 491         if (chip->prox_data >= chip->prox_abs_thres ||
 492             chip->prox_force_update)
 493                 chip->prox_persistence_counter = chip->prox_persistence;
 494
 495         chip->prox_force_update = false;
 496
 497         /* Persistence filttering to reduce false proximity events */
 498         if (likely(above)) {
 499                 if (chip->prox_persistence_counter < chip->prox_persistence) {
 500                         chip->prox_persistence_counter++;
 501                         ret = -ENODATA;
 502                 } else {
 503                         mode = PROX_ABOVE_THRESHOLD;
 504                         ret = 0;
 505                 }
 506         } else {
 507                 chip->prox_persistence_counter = 0;
 508                 mode = PROX_BELOW_THRESHOLD;
 509                 chip->prox_data = 0;
 510                 ret = 0;
 511         }
 512
 513         /* Set proximity detection rate based on above or below value */
 514         if (ret == 0) {
 515                 bh1770_prox_rate(chip, mode);
 516                 sysfs_notify(&chip->client->dev.kobj, NULL, "prox0_raw");
 517         }
 518 out:
 519         return ret;
 520 }
 521
 522 static int bh1770_detect(struct bh1770_chip *chip)
 523 {
 524         struct i2c_client *client = chip->client;
 525         s32 ret;
 526         u8 manu, part;
 527
 528         ret = i2c_smbus_read_byte_data(client, BH1770_MANUFACT_ID);
 529         if (ret < 0)
 530                 goto error;
 531         manu = (u8)ret;
 532
 533         ret = i2c_smbus_read_byte_data(client, BH1770_PART_ID);
 534         if (ret < 0)
 535                 goto error;
 536         part = (u8)ret;
 537
 538         chip->revision = (part & BH1770_REV_MASK) >> BH1770_REV_SHIFT;
 539         chip->prox_coef = BH1770_COEF_SCALER;
 540         chip->prox_const = 0;
 541         chip->lux_cf = BH1770_NEUTRAL_CF;
 542
 543         if ((manu == BH1770_MANUFACT_ROHM) &&
 544             ((part & BH1770_PART_MASK) == BH1770_PART)) {
 545                 snprintf(chip->chipname, sizeof(chip->chipname), "BH1770GLC");
 546                 return 0;
 547         }
 548
 549         if ((manu == BH1770_MANUFACT_OSRAM) &&
 550             ((part & BH1770_PART_MASK) == BH1770_PART)) {
 551                 snprintf(chip->chipname, sizeof(chip->chipname), "SFH7770");
 552                 /* Values selected by comparing different versions */
 553                 chip->prox_coef = 819; /* 0.8 * BH1770_COEF_SCALER */
 554                 chip->prox_const = 40;
 555                 return 0;
 556         }
 557
 558         ret = -ENODEV;
 559 error:
 560         dev_dbg(&client->dev, "BH1770 or SFH7770 not found\n");
 561
 562         return ret;
 563 }
 564
 565 /*
 566  * This work is re-scheduled at every proximity interrupt.
 567  * If this work is running, it means that there hasn't been any
 568  * proximity interrupt in time. Situation is handled as no-proximity.
 569  * It would be nice to have low-threshold interrupt or interrupt
 570  * when measurement and hi-threshold are both 0. But neither of those exists.
 571  * This is a workaroud for missing HW feature.
 572  */
 573
 574 static void bh1770_prox_work(struct work_struct *work)
 575 {
 576         struct bh1770_chip *chip =
 577                 container_of(work, struct bh1770_chip, prox_work.work);
 578
 579         mutex_lock(&chip->mutex);
 580         bh1770_prox_read_result(chip);
 581         mutex_unlock(&chip->mutex);
 582 }
 583
 584 /* This is threaded irq handler */
 585 static irqreturn_t bh1770_irq(int irq, void *data)
 586 {
 587         struct bh1770_chip *chip = data;
 588         int status;
 589         int rate = 0;
 590
 591         mutex_lock(&chip->mutex);
 592         status = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_PS_STATUS);
 593
 594         /* Acknowledge interrupt by reading this register */
 595         i2c_smbus_read_byte_data(chip->client, BH1770_INTERRUPT);
 596
 597         /*
 598          * Check if there is fresh data available for als.
 599          * If this is the very first data, update thresholds after that.
 600          */
 601         if (status & BH1770_INT_ALS_DATA) {
 602                 bh1770_lux_get_result(chip);
 603                 if (unlikely(chip->lux_wait_result)) {
 604                         chip->lux_wait_result = false;
 605                         wake_up(&chip->wait);
 606                         bh1770_lux_update_thresholds(chip,
 607                                                 chip->lux_threshold_hi,
 608                                                 chip->lux_threshold_lo);
 609                 }
 610         }
 611
 612         /* Disable interrupt logic to guarantee acknowledgement */
 613         i2c_smbus_write_byte_data(chip->client, BH1770_INTERRUPT,
 614                                   (0 << 1) | (0 << 0));
 615
 616         if ((status & BH1770_INT_ALS_INT))
 617                 sysfs_notify(&chip->client->dev.kobj, NULL, "lux0_input");
 618
 619         if (chip->int_mode_prox && (status & BH1770_INT_LEDS_INT)) {
 620                 rate = prox_rates_ms[chip->prox_rate_threshold];
 621                 bh1770_prox_read_result(chip);
 622         }
 623
 624         /* Re-enable interrupt logic */
 625         i2c_smbus_write_byte_data(chip->client, BH1770_INTERRUPT,
 626                                   (chip->int_mode_lux << 1) |
 627                                   (chip->int_mode_prox << 0));
 628         mutex_unlock(&chip->mutex);
 629
 630         /*
 631          * Can't cancel work while keeping mutex since the work uses the
 632          * same mutex.
 633          */
 634         if (rate) {
 635                 /*
 636                  * Simulate missing no-proximity interrupt 50ms after the
 637                  * next expected interrupt time.
 638                  */
 639                 cancel_delayed_work_sync(&chip->prox_work);
 640                 schedule_delayed_work(&chip->prox_work,
 641                                 msecs_to_jiffies(rate + 50));
 642         }
 643         return IRQ_HANDLED;
 644 }
 645
 646 static ssize_t bh1770_power_state_store(struct device *dev,
 647                                       struct device_attribute *attr,
 648                                       const char *buf, size_t count)
 649 {
 650         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 651         unsigned long value;
 652         ssize_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                 if (ret < 0) {
 663                         pm_runtime_put(dev);
 664                         goto leave;
 665                 }
 666
 667                 ret = bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
 668                 if (ret < 0) {
 669                         pm_runtime_put(dev);
 670                         goto leave;
 671                 }
 672
 673                 /* This causes interrupt after the next measurement cycle */
 674                 bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
 675                                         BH1770_LUX_DEF_THRES);
 676                 /* Inform that we are waiting for a result from ALS */
 677                 chip->lux_wait_result = true;
 678                 bh1770_prox_mode_control(chip);
 679         } else if (!pm_runtime_suspended(dev)) {
 680                 pm_runtime_put(dev);
 681         }
 682         ret = count;
 683 leave:
 684         mutex_unlock(&chip->mutex);
 685         return ret;
 686 }
 687
 688 static ssize_t bh1770_power_state_show(struct device *dev,
 689                                    struct device_attribute *attr, char *buf)
 690 {
 691         return sprintf(buf, "%d\n", !pm_runtime_suspended(dev));
 692 }
 693
 694 static ssize_t bh1770_lux_result_show(struct device *dev,
 695                                    struct device_attribute *attr, char *buf)
 696 {
 697         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 698         ssize_t ret;
 699         long timeout;
 700
 701         if (pm_runtime_suspended(dev))
 702                 return -EIO; /* Chip is not enabled at all */
 703
 704         timeout = wait_event_interruptible_timeout(chip->wait,
 705                                         !chip->lux_wait_result,
 706                                         msecs_to_jiffies(BH1770_TIMEOUT));
 707         if (!timeout)
 708                 return -EIO;
 709
 710         mutex_lock(&chip->mutex);
 711         ret = sprintf(buf, "%d\n", bh1770_lux_read_result(chip));
 712         mutex_unlock(&chip->mutex);
 713
 714         return ret;
 715 }
 716
 717 static ssize_t bh1770_lux_range_show(struct device *dev,
 718                                    struct device_attribute *attr, char *buf)
 719 {
 720         return sprintf(buf, "%d\n", BH1770_LUX_RANGE);
 721 }
 722
 723 static ssize_t bh1770_prox_enable_store(struct device *dev,
 724                                       struct device_attribute *attr,
 725                                       const char *buf, size_t count)
 726 {
 727         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 728         unsigned long value;
 729
 730         if (strict_strtoul(buf, 0, &value))
 731                 return -EINVAL;
 732
 733         mutex_lock(&chip->mutex);
 734         /* Assume no proximity. Sensor will tell real state soon */
 735         if (!chip->prox_enable_count)
 736                 chip->prox_data = 0;
 737
 738         if (value)
 739                 chip->prox_enable_count++;
 740         else if (chip->prox_enable_count > 0)
 741                 chip->prox_enable_count--;
 742         else
 743                 goto leave;
 744
 745         /* Run control only when chip is powered on */
 746         if (!pm_runtime_suspended(dev))
 747                 bh1770_prox_mode_control(chip);
 748 leave:
 749         mutex_unlock(&chip->mutex);
 750         return count;
 751 }
 752
 753 static ssize_t bh1770_prox_enable_show(struct device *dev,
 754                                    struct device_attribute *attr, char *buf)
 755 {
 756         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 757         ssize_t len;
 758
 759         mutex_lock(&chip->mutex);
 760         len = sprintf(buf, "%d\n", chip->prox_enable_count);
 761         mutex_unlock(&chip->mutex);
 762         return len;
 763 }
 764
 765 static ssize_t bh1770_prox_result_show(struct device *dev,
 766                                    struct device_attribute *attr, char *buf)
 767 {
 768         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 769         ssize_t ret;
 770
 771         mutex_lock(&chip->mutex);
 772         if (chip->prox_enable_count && !pm_runtime_suspended(dev))
 773                 ret = sprintf(buf, "%d\n", chip->prox_data);
 774         else
 775                 ret = -EIO;
 776         mutex_unlock(&chip->mutex);
 777         return ret;
 778 }
 779
 780 static ssize_t bh1770_prox_range_show(struct device *dev,
 781                                    struct device_attribute *attr, char *buf)
 782 {
 783         return sprintf(buf, "%d\n", BH1770_PROX_RANGE);
 784 }
 785
 786 static ssize_t bh1770_get_prox_rate_avail(struct device *dev,
 787                                    struct device_attribute *attr, char *buf)
 788 {
 789         int i;
 790         int pos = 0;
 791         for (i = 0; i < ARRAY_SIZE(prox_rates_hz); i++)
 792                 pos += sprintf(buf + pos, "%d ", prox_rates_hz[i]);
 793         sprintf(buf + pos - 1, "\n");
 794         return pos;
 795 }
 796
 797 static ssize_t bh1770_get_prox_rate_above(struct device *dev,
 798                                    struct device_attribute *attr, char *buf)
 799 {
 800         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 801         return sprintf(buf, "%d\n", prox_rates_hz[chip->prox_rate_threshold]);
 802 }
 803
 804 static ssize_t bh1770_get_prox_rate_below(struct device *dev,
 805                                    struct device_attribute *attr, char *buf)
 806 {
 807         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 808         return sprintf(buf, "%d\n", prox_rates_hz[chip->prox_rate]);
 809 }
 810
 811 static int bh1770_prox_rate_validate(int rate)
 812 {
 813         int i;
 814
 815         for (i = 0; i < ARRAY_SIZE(prox_rates_hz) - 1; i++)
 816                 if (rate >= prox_rates_hz[i])
 817                         break;
 818         return i;
 819 }
 820
 821 static ssize_t bh1770_set_prox_rate_above(struct device *dev,
 822                                         struct device_attribute *attr,
 823                                         const char *buf, size_t count)
 824 {
 825         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 826         unsigned long value;
 827
 828         if (strict_strtoul(buf, 0, &value))
 829                 return -EINVAL;
 830
 831         mutex_lock(&chip->mutex);
 832         chip->prox_rate_threshold = bh1770_prox_rate_validate(value);
 833         mutex_unlock(&chip->mutex);
 834         return count;
 835 }
 836
 837 static ssize_t bh1770_set_prox_rate_below(struct device *dev,
 838                                         struct device_attribute *attr,
 839                                         const char *buf, size_t count)
 840 {
 841         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 842         unsigned long value;
 843
 844         if (strict_strtoul(buf, 0, &value))
 845                 return -EINVAL;
 846
 847         mutex_lock(&chip->mutex);
 848         chip->prox_rate = bh1770_prox_rate_validate(value);
 849         mutex_unlock(&chip->mutex);
 850         return count;
 851 }
 852
 853 static ssize_t bh1770_get_prox_thres(struct device *dev,
 854                                    struct device_attribute *attr, char *buf)
 855 {
 856         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 857         return sprintf(buf, "%d\n", chip->prox_threshold);
 858 }
 859
 860 static ssize_t bh1770_set_prox_thres(struct device *dev,
 861                                       struct device_attribute *attr,
 862                                       const char *buf, size_t count)
 863 {
 864         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 865         unsigned long value;
 866         int ret;
 867
 868         if (strict_strtoul(buf, 0, &value))
 869                 return -EINVAL;
 870         if (value > BH1770_PROX_RANGE)
 871                 return -EINVAL;
 872
 873         mutex_lock(&chip->mutex);
 874         chip->prox_threshold = value;
 875         ret = bh1770_prox_set_threshold(chip);
 876         mutex_unlock(&chip->mutex);
 877         if (ret < 0)
 878                 return ret;
 879         return count;
 880 }
 881
 882 static ssize_t bh1770_prox_persistence_show(struct device *dev,
 883                                  struct device_attribute *attr, char *buf)
 884 {
 885         struct bh1770_chip *chip = dev_get_drvdata(dev);
 886
 887         return sprintf(buf, "%u\n", chip->prox_persistence);
 888 }
 889
 890 static ssize_t bh1770_prox_persistence_store(struct device *dev,
 891                                 struct device_attribute *attr,
 892                                 const char *buf, size_t len)
 893 {
 894         struct bh1770_chip *chip = dev_get_drvdata(dev);
 895         unsigned long value;
 896
 897         if (strict_strtoul(buf, 0, &value))
 898                 return -EINVAL;
 899
 900         if (value > BH1770_PROX_MAX_PERSISTENCE)
 901                 return -EINVAL;
 902
 903         chip->prox_persistence = value;
 904
 905         return len;
 906 }
 907
 908 static ssize_t bh1770_prox_abs_thres_show(struct device *dev,
 909                                  struct device_attribute *attr, char *buf)
 910 {
 911         struct bh1770_chip *chip = dev_get_drvdata(dev);
 912         return sprintf(buf, "%u\n", chip->prox_abs_thres);
 913 }
 914
 915 static ssize_t bh1770_prox_abs_thres_store(struct device *dev,
 916                                 struct device_attribute *attr,
 917                                 const char *buf, size_t len)
 918 {
 919         struct bh1770_chip *chip = dev_get_drvdata(dev);
 920         unsigned long value;
 921
 922         if (strict_strtoul(buf, 0, &value))
 923                 return -EINVAL;
 924
 925         if (value > BH1770_PROX_RANGE)
 926                 return -EINVAL;
 927
 928         chip->prox_abs_thres = value;
 929
 930         return len;
 931 }
 932
 933 static ssize_t bh1770_chip_id_show(struct device *dev,
 934                                    struct device_attribute *attr, char *buf)
 935 {
 936         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 937         return sprintf(buf, "%s rev %d\n", chip->chipname, chip->revision);
 938 }
 939
 940 static ssize_t bh1770_lux_calib_default_show(struct device *dev,
 941                                  struct device_attribute *attr, char *buf)
 942 {
 943         return sprintf(buf, "%u\n", BH1770_CALIB_SCALER);
 944 }
 945
 946 static ssize_t bh1770_lux_calib_show(struct device *dev,
 947                                  struct device_attribute *attr, char *buf)
 948 {
 949         struct bh1770_chip *chip = dev_get_drvdata(dev);
 950         ssize_t len;
 951
 952         mutex_lock(&chip->mutex);
 953         len = sprintf(buf, "%u\n", chip->lux_calib);
 954         mutex_unlock(&chip->mutex);
 955         return len;
 956 }
 957
 958 static ssize_t bh1770_lux_calib_store(struct device *dev,
 959                                   struct device_attribute *attr,
 960                                   const char *buf, size_t len)
 961 {
 962         struct bh1770_chip *chip = dev_get_drvdata(dev);
 963         unsigned long value;
 964         u32 old_calib;
 965         u32 new_corr;
 966
 967         if (strict_strtoul(buf, 0, &value))
 968                 return -EINVAL;
 969
 970         mutex_lock(&chip->mutex);
 971         old_calib = chip->lux_calib;
 972         chip->lux_calib = value;
 973         new_corr = bh1770_get_corr_value(chip);
 974         if (new_corr == 0) {
 975                 chip->lux_calib = old_calib;
 976                 mutex_unlock(&chip->mutex);
 977                 return -EINVAL;
 978         }
 979         chip->lux_corr = new_corr;
 980         /* Refresh thresholds on HW after changing correction value */
 981         bh1770_lux_update_thresholds(chip, chip->lux_threshold_hi,
 982                                 chip->lux_threshold_lo);
 983
 984         mutex_unlock(&chip->mutex);
 985
 986         return len;
 987 }
 988
 989 static ssize_t bh1770_get_lux_rate_avail(struct device *dev,
 990                                    struct device_attribute *attr, char *buf)
 991 {
 992         int i;
 993         int pos = 0;
 994         for (i = 0; i < ARRAY_SIZE(lux_rates_hz); i++)
 995                 pos += sprintf(buf + pos, "%d ", lux_rates_hz[i]);
 996         sprintf(buf + pos - 1, "\n");
 997         return pos;
 998 }
 999
1000 static ssize_t bh1770_get_lux_rate(struct device *dev,
1001                                    struct device_attribute *attr, char *buf)
1002 {
1003         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1004         return sprintf(buf, "%d\n", lux_rates_hz[chip->lux_rate_index]);
1005 }
1006
1007 static ssize_t bh1770_set_lux_rate(struct device *dev,
1008                                       struct device_attribute *attr,
1009                                       const char *buf, size_t count)
1010 {
1011         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1012         unsigned long rate_hz;
1013         int ret, i;
1014
1015         if (strict_strtoul(buf, 0, &rate_hz))
1016                 return -EINVAL;
1017
1018         for (i = 0; i < ARRAY_SIZE(lux_rates_hz) - 1; i++)
1019                 if (rate_hz >= lux_rates_hz[i])
1020                         break;
1021
1022         mutex_lock(&chip->mutex);
1023         chip->lux_rate_index = i;
1024         ret = bh1770_lux_rate(chip, i);
1025         mutex_unlock(&chip->mutex);
1026
1027         if (ret < 0)
1028                 return ret;
1029
1030         return count;
1031 }
1032
1033 static ssize_t bh1770_get_lux_thresh_above(struct device *dev,
1034                                    struct device_attribute *attr, char *buf)
1035 {
1036         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1037         return sprintf(buf, "%d\n", chip->lux_threshold_hi);
1038 }
1039
1040 static ssize_t bh1770_get_lux_thresh_below(struct device *dev,
1041                                    struct device_attribute *attr, char *buf)
1042 {
1043         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1044         return sprintf(buf, "%d\n", chip->lux_threshold_lo);
1045 }
1046
1047 static ssize_t bh1770_set_lux_thresh(struct bh1770_chip *chip, u16 *target,
1048                                 const char *buf)
1049 {
1050         int ret = 0;
1051         unsigned long thresh;
1052
1053         if (strict_strtoul(buf, 0, &thresh))
1054                 return -EINVAL;
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 struct attribute_group bh1770_attribute_group = {
1162         .attrs = sysfs_attrs
1163 };
1164
1165 static int __devinit 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 = kzalloc(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                 err = -EINVAL;
1185                 goto fail1;
1186         }
1187
1188         chip->pdata             = client->dev.platform_data;
1189         chip->lux_calib         = BH1770_LUX_NEUTRAL_CALIB_VALUE;
1190         chip->lux_rate_index    = BH1770_LUX_DEFAULT_RATE;
1191         chip->lux_threshold_lo  = BH1770_LUX_DEF_THRES;
1192         chip->lux_threshold_hi  = BH1770_LUX_DEF_THRES;
1193
1194         if (chip->pdata->glass_attenuation == 0)
1195                 chip->lux_ga = BH1770_NEUTRAL_GA;
1196         else
1197                 chip->lux_ga = chip->pdata->glass_attenuation;
1198
1199         chip->prox_threshold    = BH1770_PROX_DEF_THRES;
1200         chip->prox_led          = chip->pdata->led_def_curr;
1201         chip->prox_abs_thres    = BH1770_PROX_DEF_ABS_THRES;
1202         chip->prox_persistence  = BH1770_DEFAULT_PERSISTENCE;
1203         chip->prox_rate_threshold = BH1770_PROX_DEF_RATE_THRESH;
1204         chip->prox_rate         = BH1770_PROX_DEFAULT_RATE;
1205         chip->prox_data         = 0;
1206
1207         chip->regs[0].supply = reg_vcc;
1208         chip->regs[1].supply = reg_vleds;
1209
1210         err = regulator_bulk_get(&client->dev,
1211                                  ARRAY_SIZE(chip->regs), chip->regs);
1212         if (err < 0) {
1213                 dev_err(&client->dev, "Cannot get regulators\n");
1214                 goto fail1;
1215         }
1216
1217         err = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
1218                                 chip->regs);
1219         if (err < 0) {
1220                 dev_err(&client->dev, "Cannot enable regulators\n");
1221                 goto fail2;
1222         }
1223
1224         usleep_range(BH1770_STARTUP_DELAY, BH1770_STARTUP_DELAY * 2);
1225         err = bh1770_detect(chip);
1226         if (err < 0)
1227                 goto fail3;
1228
1229         /* Start chip */
1230         bh1770_chip_on(chip);
1231         pm_runtime_set_active(&client->dev);
1232         pm_runtime_enable(&client->dev);
1233
1234         chip->lux_corr = bh1770_get_corr_value(chip);
1235         if (chip->lux_corr == 0) {
1236                 dev_err(&client->dev, "Improper correction values\n");
1237                 err = -EINVAL;
1238                 goto fail3;
1239         }
1240
1241         if (chip->pdata->setup_resources) {
1242                 err = chip->pdata->setup_resources();
1243                 if (err) {
1244                         err = -EINVAL;
1245                         goto fail3;
1246                 }
1247         }
1248
1249         err = sysfs_create_group(&chip->client->dev.kobj,
1250                                 &bh1770_attribute_group);
1251         if (err < 0) {
1252                 dev_err(&chip->client->dev, "Sysfs registration failed\n");
1253                 goto fail4;
1254         }
1255
1256         /*
1257          * Chip needs level triggered interrupt to work. However,
1258          * level triggering doesn't work always correctly with power
1259          * management. Select both
1260          */
1261         err = request_threaded_irq(client->irq, NULL,
1262                                 bh1770_irq,
1263                                 IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
1264                                 IRQF_TRIGGER_LOW,
1265                                 "bh1770", chip);
1266         if (err) {
1267                 dev_err(&client->dev, "could not get IRQ %d\n",
1268                         client->irq);
1269                 goto fail5;
1270         }
1271         regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
1272         return err;
1273 fail5:
1274         sysfs_remove_group(&chip->client->dev.kobj,
1275                         &bh1770_attribute_group);
1276 fail4:
1277         if (chip->pdata->release_resources)
1278                 chip->pdata->release_resources();
1279 fail3:
1280         regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
1281 fail2:
1282         regulator_bulk_free(ARRAY_SIZE(chip->regs), chip->regs);
1283 fail1:
1284         kfree(chip);
1285         return err;
1286 }
1287
1288 static int __devexit bh1770_remove(struct i2c_client *client)
1289 {
1290         struct bh1770_chip *chip = i2c_get_clientdata(client);
1291
1292         free_irq(client->irq, chip);
1293
1294         sysfs_remove_group(&chip->client->dev.kobj,
1295                         &bh1770_attribute_group);
1296
1297         if (chip->pdata->release_resources)
1298                 chip->pdata->release_resources();
1299
1300         cancel_delayed_work_sync(&chip->prox_work);
1301
1302         if (!pm_runtime_suspended(&client->dev))
1303                 bh1770_chip_off(chip);
1304
1305         pm_runtime_disable(&client->dev);
1306         pm_runtime_set_suspended(&client->dev);
1307
1308         regulator_bulk_free(ARRAY_SIZE(chip->regs), chip->regs);
1309         kfree(chip);
1310         return 0;
1311 }
1312
1313 #ifdef CONFIG_PM
1314 static int bh1770_suspend(struct device *dev)
1315 {
1316         struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1317         struct bh1770_chip *chip = i2c_get_clientdata(client);
1318
1319         bh1770_chip_off(chip);
1320
1321         return 0;
1322 }
1323
1324 static int bh1770_resume(struct device *dev)
1325 {
1326         struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1327         struct bh1770_chip *chip = i2c_get_clientdata(client);
1328         int ret = 0;
1329
1330         bh1770_chip_on(chip);
1331
1332         if (!pm_runtime_suspended(dev)) {
1333                 /*
1334                  * If we were enabled at suspend time, it is expected
1335                  * everything works nice and smoothly
1336                  */
1337                 ret = bh1770_lux_rate(chip, chip->lux_rate_index);
1338                 ret |= bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
1339
1340                 /* This causes interrupt after the next measurement cycle */
1341                 bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
1342                                         BH1770_LUX_DEF_THRES);
1343                 /* Inform that we are waiting for a result from ALS */
1344                 chip->lux_wait_result = true;
1345                 bh1770_prox_mode_control(chip);
1346         }
1347         return ret;
1348 }
1349
1350 #else
1351 #define bh1770_suspend  NULL
1352 #define bh1770_shutdown NULL
1353 #define bh1770_resume   NULL
1354 #endif
1355
1356 #ifdef CONFIG_PM_RUNTIME
1357 static int bh1770_runtime_suspend(struct device *dev)
1358 {
1359         struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1360         struct bh1770_chip *chip = i2c_get_clientdata(client);
1361
1362         bh1770_chip_off(chip);
1363
1364         return 0;
1365 }
1366
1367 static int bh1770_runtime_resume(struct device *dev)
1368 {
1369         struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1370         struct bh1770_chip *chip = i2c_get_clientdata(client);
1371
1372         bh1770_chip_on(chip);
1373
1374         return 0;
1375 }
1376 #endif
1377
1378 static const struct i2c_device_id bh1770_id[] = {
1379         {"bh1770glc", 0 },
1380         {"sfh7770", 0 },
1381         {}
1382 };
1383
1384 MODULE_DEVICE_TABLE(i2c, bh1770_id);
1385
1386 static const struct dev_pm_ops bh1770_pm_ops = {
1387         SET_SYSTEM_SLEEP_PM_OPS(bh1770_suspend, bh1770_resume)
1388         SET_RUNTIME_PM_OPS(bh1770_runtime_suspend, bh1770_runtime_resume, NULL)
1389 };
1390
1391 static struct i2c_driver bh1770_driver = {
1392         .driver  = {
1393                 .name   = "bh1770glc",
1394                 .owner  = THIS_MODULE,
1395                 .pm     = &bh1770_pm_ops,
1396         },
1397         .probe    = bh1770_probe,
1398         .remove   = __devexit_p(bh1770_remove),
1399         .id_table = bh1770_id,
1400 };
1401
1402 static int __init bh1770_init(void)
1403 {
1404         return i2c_add_driver(&bh1770_driver);
1405 }
1406
1407 static void __exit bh1770_exit(void)
1408 {
1409         i2c_del_driver(&bh1770_driver);
1410 }
1411
1412 MODULE_DESCRIPTION("BH1770GLC / SFH7770 combined ALS and proximity sensor");
1413 MODULE_AUTHOR("Samu Onkalo, Nokia Corporation");
1414 MODULE_LICENSE("GPL v2");
1415
1416 module_init(bh1770_init);
1417 module_exit(bh1770_exit);