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         size_t ret;
 653
 654         if (strict_strtoul(buf, 0, &value))
 655                 return -EINVAL;
 656
 657         mutex_lock(&chip->mutex);
 658         if (value) {
 659                 pm_runtime_get_sync(dev);
 660
 661                 ret = bh1770_lux_rate(chip, chip->lux_rate_index);
 662                 ret |= bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
 663
 664                 if (ret < 0) {
 665                         pm_runtime_put(dev);
 666                         goto leave;
 667                 }
 668
 669                 /* This causes interrupt after the next measurement cycle */
 670                 bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
 671                                         BH1770_LUX_DEF_THRES);
 672                 /* Inform that we are waiting for a result from ALS */
 673                 chip->lux_wait_result = true;
 674                 bh1770_prox_mode_control(chip);
 675         } else if (!pm_runtime_suspended(dev)) {
 676                 pm_runtime_put(dev);
 677         }
 678         ret = count;
 679 leave:
 680         mutex_unlock(&chip->mutex);
 681         return ret;
 682 }
 683
 684 static ssize_t bh1770_power_state_show(struct device *dev,
 685                                    struct device_attribute *attr, char *buf)
 686 {
 687         return sprintf(buf, "%d\n", !pm_runtime_suspended(dev));
 688 }
 689
 690 static ssize_t bh1770_lux_result_show(struct device *dev,
 691                                    struct device_attribute *attr, char *buf)
 692 {
 693         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 694         ssize_t ret;
 695         long timeout;
 696
 697         if (pm_runtime_suspended(dev))
 698                 return -EIO; /* Chip is not enabled at all */
 699
 700         timeout = wait_event_interruptible_timeout(chip->wait,
 701                                         !chip->lux_wait_result,
 702                                         msecs_to_jiffies(BH1770_TIMEOUT));
 703         if (!timeout)
 704                 return -EIO;
 705
 706         mutex_lock(&chip->mutex);
 707         ret = sprintf(buf, "%d\n", bh1770_lux_read_result(chip));
 708         mutex_unlock(&chip->mutex);
 709
 710         return ret;
 711 }
 712
 713 static ssize_t bh1770_lux_range_show(struct device *dev,
 714                                    struct device_attribute *attr, char *buf)
 715 {
 716         return sprintf(buf, "%d\n", BH1770_LUX_RANGE);
 717 }
 718
 719 static ssize_t bh1770_prox_enable_store(struct device *dev,
 720                                       struct device_attribute *attr,
 721                                       const char *buf, size_t count)
 722 {
 723         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 724         unsigned long value;
 725
 726         if (strict_strtoul(buf, 0, &value))
 727                 return -EINVAL;
 728
 729         mutex_lock(&chip->mutex);
 730         /* Assume no proximity. Sensor will tell real state soon */
 731         if (!chip->prox_enable_count)
 732                 chip->prox_data = 0;
 733
 734         if (value)
 735                 chip->prox_enable_count++;
 736         else if (chip->prox_enable_count > 0)
 737                 chip->prox_enable_count--;
 738         else
 739                 goto leave;
 740
 741         /* Run control only when chip is powered on */
 742         if (!pm_runtime_suspended(dev))
 743                 bh1770_prox_mode_control(chip);
 744 leave:
 745         mutex_unlock(&chip->mutex);
 746         return count;
 747 }
 748
 749 static ssize_t bh1770_prox_enable_show(struct device *dev,
 750                                    struct device_attribute *attr, char *buf)
 751 {
 752         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 753         ssize_t len;
 754
 755         mutex_lock(&chip->mutex);
 756         len = sprintf(buf, "%d\n", chip->prox_enable_count);
 757         mutex_unlock(&chip->mutex);
 758         return len;
 759 }
 760
 761 static ssize_t bh1770_prox_result_show(struct device *dev,
 762                                    struct device_attribute *attr, char *buf)
 763 {
 764         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 765         ssize_t ret;
 766
 767         mutex_lock(&chip->mutex);
 768         if (chip->prox_enable_count && !pm_runtime_suspended(dev))
 769                 ret = sprintf(buf, "%d\n", chip->prox_data);
 770         else
 771                 ret = -EIO;
 772         mutex_unlock(&chip->mutex);
 773         return ret;
 774 }
 775
 776 static ssize_t bh1770_prox_range_show(struct device *dev,
 777                                    struct device_attribute *attr, char *buf)
 778 {
 779         return sprintf(buf, "%d\n", BH1770_PROX_RANGE);
 780 }
 781
 782 static ssize_t bh1770_get_prox_rate_avail(struct device *dev,
 783                                    struct device_attribute *attr, char *buf)
 784 {
 785         int i;
 786         int pos = 0;
 787         for (i = 0; i < ARRAY_SIZE(prox_rates_hz); i++)
 788                 pos += sprintf(buf + pos, "%d ", prox_rates_hz[i]);
 789         sprintf(buf + pos - 1, "\n");
 790         return pos;
 791 }
 792
 793 static ssize_t bh1770_get_prox_rate_above(struct device *dev,
 794                                    struct device_attribute *attr, char *buf)
 795 {
 796         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 797         return sprintf(buf, "%d\n", prox_rates_hz[chip->prox_rate_threshold]);
 798 }
 799
 800 static ssize_t bh1770_get_prox_rate_below(struct device *dev,
 801                                    struct device_attribute *attr, char *buf)
 802 {
 803         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 804         return sprintf(buf, "%d\n", prox_rates_hz[chip->prox_rate]);
 805 }
 806
 807 static int bh1770_prox_rate_validate(int rate)
 808 {
 809         int i;
 810
 811         for (i = 0; i < ARRAY_SIZE(prox_rates_hz) - 1; i++)
 812                 if (rate >= prox_rates_hz[i])
 813                         break;
 814         return i;
 815 }
 816
 817 static ssize_t bh1770_set_prox_rate_above(struct device *dev,
 818                                         struct device_attribute *attr,
 819                                         const char *buf, size_t count)
 820 {
 821         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 822         unsigned long value;
 823
 824         if (strict_strtoul(buf, 0, &value))
 825                 return -EINVAL;
 826
 827         mutex_lock(&chip->mutex);
 828         chip->prox_rate_threshold = bh1770_prox_rate_validate(value);
 829         mutex_unlock(&chip->mutex);
 830         return count;
 831 }
 832
 833 static ssize_t bh1770_set_prox_rate_below(struct device *dev,
 834                                         struct device_attribute *attr,
 835                                         const char *buf, size_t count)
 836 {
 837         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 838         unsigned long value;
 839
 840         if (strict_strtoul(buf, 0, &value))
 841                 return -EINVAL;
 842
 843         mutex_lock(&chip->mutex);
 844         chip->prox_rate = bh1770_prox_rate_validate(value);
 845         mutex_unlock(&chip->mutex);
 846         return count;
 847 }
 848
 849 static ssize_t bh1770_get_prox_thres(struct device *dev,
 850                                    struct device_attribute *attr, char *buf)
 851 {
 852         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 853         return sprintf(buf, "%d\n", chip->prox_threshold);
 854 }
 855
 856 static ssize_t bh1770_set_prox_thres(struct device *dev,
 857                                       struct device_attribute *attr,
 858                                       const char *buf, size_t count)
 859 {
 860         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 861         unsigned long value;
 862         int ret;
 863
 864         if (strict_strtoul(buf, 0, &value))
 865                 return -EINVAL;
 866         if (value > BH1770_PROX_RANGE)
 867                 return -EINVAL;
 868
 869         mutex_lock(&chip->mutex);
 870         chip->prox_threshold = value;
 871         ret = bh1770_prox_set_threshold(chip);
 872         mutex_unlock(&chip->mutex);
 873         if (ret < 0)
 874                 return ret;
 875         return count;
 876 }
 877
 878 static ssize_t bh1770_prox_persistence_show(struct device *dev,
 879                                  struct device_attribute *attr, char *buf)
 880 {
 881         struct bh1770_chip *chip = dev_get_drvdata(dev);
 882
 883         return sprintf(buf, "%u\n", chip->prox_persistence);
 884 }
 885
 886 static ssize_t bh1770_prox_persistence_store(struct device *dev,
 887                                 struct device_attribute *attr,
 888                                 const char *buf, size_t len)
 889 {
 890         struct bh1770_chip *chip = dev_get_drvdata(dev);
 891         unsigned long value;
 892
 893         if (strict_strtoul(buf, 0, &value))
 894                 return -EINVAL;
 895
 896         if (value > BH1770_PROX_MAX_PERSISTENCE)
 897                 return -EINVAL;
 898
 899         chip->prox_persistence = value;
 900
 901         return len;
 902 }
 903
 904 static ssize_t bh1770_prox_abs_thres_show(struct device *dev,
 905                                  struct device_attribute *attr, char *buf)
 906 {
 907         struct bh1770_chip *chip = dev_get_drvdata(dev);
 908         return sprintf(buf, "%u\n", chip->prox_abs_thres);
 909 }
 910
 911 static ssize_t bh1770_prox_abs_thres_store(struct device *dev,
 912                                 struct device_attribute *attr,
 913                                 const char *buf, size_t len)
 914 {
 915         struct bh1770_chip *chip = dev_get_drvdata(dev);
 916         unsigned long value;
 917
 918         if (strict_strtoul(buf, 0, &value))
 919                 return -EINVAL;
 920
 921         if (value > BH1770_PROX_RANGE)
 922                 return -EINVAL;
 923
 924         chip->prox_abs_thres = value;
 925
 926         return len;
 927 }
 928
 929 static ssize_t bh1770_chip_id_show(struct device *dev,
 930                                    struct device_attribute *attr, char *buf)
 931 {
 932         struct bh1770_chip *chip =  dev_get_drvdata(dev);
 933         return sprintf(buf, "%s rev %d\n", chip->chipname, chip->revision);
 934 }
 935
 936 static ssize_t bh1770_lux_calib_default_show(struct device *dev,
 937                                  struct device_attribute *attr, char *buf)
 938 {
 939         return sprintf(buf, "%u\n", BH1770_CALIB_SCALER);
 940 }
 941
 942 static ssize_t bh1770_lux_calib_show(struct device *dev,
 943                                  struct device_attribute *attr, char *buf)
 944 {
 945         struct bh1770_chip *chip = dev_get_drvdata(dev);
 946         ssize_t len;
 947
 948         mutex_lock(&chip->mutex);
 949         len = sprintf(buf, "%u\n", chip->lux_calib);
 950         mutex_unlock(&chip->mutex);
 951         return len;
 952 }
 953
 954 static ssize_t bh1770_lux_calib_store(struct device *dev,
 955                                   struct device_attribute *attr,
 956                                   const char *buf, size_t len)
 957 {
 958         struct bh1770_chip *chip = dev_get_drvdata(dev);
 959         unsigned long value;
 960         u32 old_calib;
 961         u32 new_corr;
 962
 963         if (strict_strtoul(buf, 0, &value))
 964                 return -EINVAL;
 965
 966         mutex_lock(&chip->mutex);
 967         old_calib = chip->lux_calib;
 968         chip->lux_calib = value;
 969         new_corr = bh1770_get_corr_value(chip);
 970         if (new_corr == 0) {
 971                 chip->lux_calib = old_calib;
 972                 mutex_unlock(&chip->mutex);
 973                 return -EINVAL;
 974         }
 975         chip->lux_corr = new_corr;
 976         /* Refresh thresholds on HW after changing correction value */
 977         bh1770_lux_update_thresholds(chip, chip->lux_threshold_hi,
 978                                 chip->lux_threshold_lo);
 979
 980         mutex_unlock(&chip->mutex);
 981
 982         return len;
 983 }
 984
 985 static ssize_t bh1770_get_lux_rate_avail(struct device *dev,
 986                                    struct device_attribute *attr, char *buf)
 987 {
 988         int i;
 989         int pos = 0;
 990         for (i = 0; i < ARRAY_SIZE(lux_rates_hz); i++)
 991                 pos += sprintf(buf + pos, "%d ", lux_rates_hz[i]);
 992         sprintf(buf + pos - 1, "\n");
 993         return pos;
 994 }
 995
 996 static ssize_t bh1770_get_lux_rate(struct device *dev,
 997                                    struct device_attribute *attr, char *buf)
 998 {
 999         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1000         return sprintf(buf, "%d\n", lux_rates_hz[chip->lux_rate_index]);
1001 }
1002
1003 static ssize_t bh1770_set_lux_rate(struct device *dev,
1004                                       struct device_attribute *attr,
1005                                       const char *buf, size_t count)
1006 {
1007         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1008         unsigned long rate_hz;
1009         int ret, i;
1010
1011         if (strict_strtoul(buf, 0, &rate_hz))
1012                 return -EINVAL;
1013
1014         for (i = 0; i < ARRAY_SIZE(lux_rates_hz) - 1; i++)
1015                 if (rate_hz >= lux_rates_hz[i])
1016                         break;
1017
1018         mutex_lock(&chip->mutex);
1019         chip->lux_rate_index = i;
1020         ret = bh1770_lux_rate(chip, i);
1021         mutex_unlock(&chip->mutex);
1022
1023         if (ret < 0)
1024                 return ret;
1025
1026         return count;
1027 }
1028
1029 static ssize_t bh1770_get_lux_thresh_above(struct device *dev,
1030                                    struct device_attribute *attr, char *buf)
1031 {
1032         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1033         return sprintf(buf, "%d\n", chip->lux_threshold_hi);
1034 }
1035
1036 static ssize_t bh1770_get_lux_thresh_below(struct device *dev,
1037                                    struct device_attribute *attr, char *buf)
1038 {
1039         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1040         return sprintf(buf, "%d\n", chip->lux_threshold_lo);
1041 }
1042
1043 static ssize_t bh1770_set_lux_thresh(struct bh1770_chip *chip, u16 *target,
1044                                 const char *buf)
1045 {
1046         int ret = 0;
1047         unsigned long thresh;
1048
1049         if (strict_strtoul(buf, 0, &thresh))
1050                 return -EINVAL;
1051
1052         if (thresh > BH1770_LUX_RANGE)
1053                 return -EINVAL;
1054
1055         mutex_lock(&chip->mutex);
1056         *target = thresh;
1057         /*
1058          * Don't update values in HW if we are still waiting for
1059          * first interrupt to come after device handle open call.
1060          */
1061         if (!chip->lux_wait_result)
1062                 ret = bh1770_lux_update_thresholds(chip,
1063                                                 chip->lux_threshold_hi,
1064                                                 chip->lux_threshold_lo);
1065         mutex_unlock(&chip->mutex);
1066         return ret;
1067
1068 }
1069
1070 static ssize_t bh1770_set_lux_thresh_above(struct device *dev,
1071                                   struct device_attribute *attr,
1072                                   const char *buf, size_t len)
1073 {
1074         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1075         int ret = bh1770_set_lux_thresh(chip, &chip->lux_threshold_hi, buf);
1076         if (ret < 0)
1077                 return ret;
1078         return len;
1079 }
1080
1081 static ssize_t bh1770_set_lux_thresh_below(struct device *dev,
1082                                   struct device_attribute *attr,
1083                                   const char *buf, size_t len)
1084 {
1085         struct bh1770_chip *chip =  dev_get_drvdata(dev);
1086         int ret = bh1770_set_lux_thresh(chip, &chip->lux_threshold_lo, buf);
1087         if (ret < 0)
1088                 return ret;
1089         return len;
1090 }
1091
1092 static DEVICE_ATTR(prox0_raw_en, S_IRUGO | S_IWUSR, bh1770_prox_enable_show,
1093                                                 bh1770_prox_enable_store);
1094 static DEVICE_ATTR(prox0_thresh_above1_value, S_IRUGO | S_IWUSR,
1095                                                 bh1770_prox_abs_thres_show,
1096                                                 bh1770_prox_abs_thres_store);
1097 static DEVICE_ATTR(prox0_thresh_above0_value, S_IRUGO | S_IWUSR,
1098                                                 bh1770_get_prox_thres,
1099                                                 bh1770_set_prox_thres);
1100 static DEVICE_ATTR(prox0_raw, S_IRUGO, bh1770_prox_result_show, NULL);
1101 static DEVICE_ATTR(prox0_sensor_range, S_IRUGO, bh1770_prox_range_show, NULL);
1102 static DEVICE_ATTR(prox0_thresh_above_count, S_IRUGO | S_IWUSR,
1103                                                 bh1770_prox_persistence_show,
1104                                                 bh1770_prox_persistence_store);
1105 static DEVICE_ATTR(prox0_rate_above, S_IRUGO | S_IWUSR,
1106                                                 bh1770_get_prox_rate_above,
1107                                                 bh1770_set_prox_rate_above);
1108 static DEVICE_ATTR(prox0_rate_below, S_IRUGO | S_IWUSR,
1109                                                 bh1770_get_prox_rate_below,
1110                                                 bh1770_set_prox_rate_below);
1111 static DEVICE_ATTR(prox0_rate_avail, S_IRUGO, bh1770_get_prox_rate_avail, NULL);
1112
1113 static DEVICE_ATTR(lux0_calibscale, S_IRUGO | S_IWUSR, bh1770_lux_calib_show,
1114                                                 bh1770_lux_calib_store);
1115 static DEVICE_ATTR(lux0_calibscale_default, S_IRUGO,
1116                                                 bh1770_lux_calib_default_show,
1117                                                 NULL);
1118 static DEVICE_ATTR(lux0_input, S_IRUGO, bh1770_lux_result_show, NULL);
1119 static DEVICE_ATTR(lux0_sensor_range, S_IRUGO, bh1770_lux_range_show, NULL);
1120 static DEVICE_ATTR(lux0_rate, S_IRUGO | S_IWUSR, bh1770_get_lux_rate,
1121                                                 bh1770_set_lux_rate);
1122 static DEVICE_ATTR(lux0_rate_avail, S_IRUGO, bh1770_get_lux_rate_avail, NULL);
1123 static DEVICE_ATTR(lux0_thresh_above_value, S_IRUGO | S_IWUSR,
1124                                                 bh1770_get_lux_thresh_above,
1125                                                 bh1770_set_lux_thresh_above);
1126 static DEVICE_ATTR(lux0_thresh_below_value, S_IRUGO | S_IWUSR,
1127                                                 bh1770_get_lux_thresh_below,
1128                                                 bh1770_set_lux_thresh_below);
1129 static DEVICE_ATTR(chip_id, S_IRUGO, bh1770_chip_id_show, NULL);
1130 static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR, bh1770_power_state_show,
1131                                                  bh1770_power_state_store);
1132
1133
1134 static struct attribute *sysfs_attrs[] = {
1135         &dev_attr_lux0_calibscale.attr,
1136         &dev_attr_lux0_calibscale_default.attr,
1137         &dev_attr_lux0_input.attr,
1138         &dev_attr_lux0_sensor_range.attr,
1139         &dev_attr_lux0_rate.attr,
1140         &dev_attr_lux0_rate_avail.attr,
1141         &dev_attr_lux0_thresh_above_value.attr,
1142         &dev_attr_lux0_thresh_below_value.attr,
1143         &dev_attr_prox0_raw.attr,
1144         &dev_attr_prox0_sensor_range.attr,
1145         &dev_attr_prox0_raw_en.attr,
1146         &dev_attr_prox0_thresh_above_count.attr,
1147         &dev_attr_prox0_rate_above.attr,
1148         &dev_attr_prox0_rate_below.attr,
1149         &dev_attr_prox0_rate_avail.attr,
1150         &dev_attr_prox0_thresh_above0_value.attr,
1151         &dev_attr_prox0_thresh_above1_value.attr,
1152         &dev_attr_chip_id.attr,
1153         &dev_attr_power_state.attr,
1154         NULL
1155 };
1156
1157 static struct attribute_group bh1770_attribute_group = {
1158         .attrs = sysfs_attrs
1159 };
1160
1161 static int __devinit bh1770_probe(struct i2c_client *client,
1162                                 const struct i2c_device_id *id)
1163 {
1164         struct bh1770_chip *chip;
1165         int err;
1166
1167         chip = kzalloc(sizeof *chip, GFP_KERNEL);
1168         if (!chip)
1169                 return -ENOMEM;
1170
1171         i2c_set_clientdata(client, chip);
1172         chip->client  = client;
1173
1174         mutex_init(&chip->mutex);
1175         init_waitqueue_head(&chip->wait);
1176         INIT_DELAYED_WORK(&chip->prox_work, bh1770_prox_work);
1177
1178         if (client->dev.platform_data == NULL) {
1179                 dev_err(&client->dev, "platform data is mandatory\n");
1180                 err = -EINVAL;
1181                 goto fail1;
1182         }
1183
1184         chip->pdata             = client->dev.platform_data;
1185         chip->lux_calib         = BH1770_LUX_NEUTRAL_CALIB_VALUE;
1186         chip->lux_rate_index    = BH1770_LUX_DEFAULT_RATE;
1187         chip->lux_threshold_lo  = BH1770_LUX_DEF_THRES;
1188         chip->lux_threshold_hi  = BH1770_LUX_DEF_THRES;
1189
1190         if (chip->pdata->glass_attenuation == 0)
1191                 chip->lux_ga = BH1770_NEUTRAL_GA;
1192         else
1193                 chip->lux_ga = chip->pdata->glass_attenuation;
1194
1195         chip->prox_threshold    = BH1770_PROX_DEF_THRES;
1196         chip->prox_led          = chip->pdata->led_def_curr;
1197         chip->prox_abs_thres    = BH1770_PROX_DEF_ABS_THRES;
1198         chip->prox_persistence  = BH1770_DEFAULT_PERSISTENCE;
1199         chip->prox_rate_threshold = BH1770_PROX_DEF_RATE_THRESH;
1200         chip->prox_rate         = BH1770_PROX_DEFAULT_RATE;
1201         chip->prox_data         = 0;
1202
1203         chip->regs[0].supply = reg_vcc;
1204         chip->regs[1].supply = reg_vleds;
1205
1206         err = regulator_bulk_get(&client->dev,
1207                                  ARRAY_SIZE(chip->regs), chip->regs);
1208         if (err < 0) {
1209                 dev_err(&client->dev, "Cannot get regulators\n");
1210                 goto fail1;
1211         }
1212
1213         err = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
1214                                 chip->regs);
1215         if (err < 0) {
1216                 dev_err(&client->dev, "Cannot enable regulators\n");
1217                 goto fail2;
1218         }
1219
1220         usleep_range(BH1770_STARTUP_DELAY, BH1770_STARTUP_DELAY * 2);
1221         err = bh1770_detect(chip);
1222         if (err < 0)
1223                 goto fail3;
1224
1225         /* Start chip */
1226         bh1770_chip_on(chip);
1227         pm_runtime_set_active(&client->dev);
1228         pm_runtime_enable(&client->dev);
1229
1230         chip->lux_corr = bh1770_get_corr_value(chip);
1231         if (chip->lux_corr == 0) {
1232                 dev_err(&client->dev, "Improper correction values\n");
1233                 err = -EINVAL;
1234                 goto fail3;
1235         }
1236
1237         if (chip->pdata->setup_resources) {
1238                 err = chip->pdata->setup_resources();
1239                 if (err) {
1240                         err = -EINVAL;
1241                         goto fail3;
1242                 }
1243         }
1244
1245         err = sysfs_create_group(&chip->client->dev.kobj,
1246                                 &bh1770_attribute_group);
1247         if (err < 0) {
1248                 dev_err(&chip->client->dev, "Sysfs registration failed\n");
1249                 goto fail4;
1250         }
1251
1252         /*
1253          * Chip needs level triggered interrupt to work. However,
1254          * level triggering doesn't work always correctly with power
1255          * management. Select both
1256          */
1257         err = request_threaded_irq(client->irq, NULL,
1258                                 bh1770_irq,
1259                                 IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
1260                                 IRQF_TRIGGER_LOW,
1261                                 "bh1770", chip);
1262         if (err) {
1263                 dev_err(&client->dev, "could not get IRQ %d\n",
1264                         client->irq);
1265                 goto fail5;
1266         }
1267         regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
1268         return err;
1269 fail5:
1270         sysfs_remove_group(&chip->client->dev.kobj,
1271                         &bh1770_attribute_group);
1272 fail4:
1273         if (chip->pdata->release_resources)
1274                 chip->pdata->release_resources();
1275 fail3:
1276         regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
1277 fail2:
1278         regulator_bulk_free(ARRAY_SIZE(chip->regs), chip->regs);
1279 fail1:
1280         kfree(chip);
1281         return err;
1282 }
1283
1284 static int __devexit bh1770_remove(struct i2c_client *client)
1285 {
1286         struct bh1770_chip *chip = i2c_get_clientdata(client);
1287
1288         free_irq(client->irq, chip);
1289
1290         sysfs_remove_group(&chip->client->dev.kobj,
1291                         &bh1770_attribute_group);
1292
1293         if (chip->pdata->release_resources)
1294                 chip->pdata->release_resources();
1295
1296         cancel_delayed_work_sync(&chip->prox_work);
1297
1298         if (!pm_runtime_suspended(&client->dev))
1299                 bh1770_chip_off(chip);
1300
1301         pm_runtime_disable(&client->dev);
1302         pm_runtime_set_suspended(&client->dev);
1303
1304         regulator_bulk_free(ARRAY_SIZE(chip->regs), chip->regs);
1305         kfree(chip);
1306         return 0;
1307 }
1308
1309 #ifdef CONFIG_PM
1310 static int bh1770_suspend(struct device *dev)
1311 {
1312         struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1313         struct bh1770_chip *chip = i2c_get_clientdata(client);
1314
1315         bh1770_chip_off(chip);
1316
1317         return 0;
1318 }
1319
1320 static int bh1770_resume(struct device *dev)
1321 {
1322         struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1323         struct bh1770_chip *chip = i2c_get_clientdata(client);
1324         int ret = 0;
1325
1326         bh1770_chip_on(chip);
1327
1328         if (!pm_runtime_suspended(dev)) {
1329                 /*
1330                  * If we were enabled at suspend time, it is expected
1331                  * everything works nice and smoothly
1332                  */
1333                 ret = bh1770_lux_rate(chip, chip->lux_rate_index);
1334                 ret |= bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
1335
1336                 /* This causes interrupt after the next measurement cycle */
1337                 bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
1338                                         BH1770_LUX_DEF_THRES);
1339                 /* Inform that we are waiting for a result from ALS */
1340                 chip->lux_wait_result = true;
1341                 bh1770_prox_mode_control(chip);
1342         }
1343         return ret;
1344 }
1345
1346 #else
1347 #define bh1770_suspend  NULL
1348 #define bh1770_shutdown NULL
1349 #define bh1770_resume   NULL
1350 #endif
1351
1352 #ifdef CONFIG_PM_RUNTIME
1353 static int bh1770_runtime_suspend(struct device *dev)
1354 {
1355         struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1356         struct bh1770_chip *chip = i2c_get_clientdata(client);
1357
1358         bh1770_chip_off(chip);
1359
1360         return 0;
1361 }
1362
1363 static int bh1770_runtime_resume(struct device *dev)
1364 {
1365         struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1366         struct bh1770_chip *chip = i2c_get_clientdata(client);
1367
1368         bh1770_chip_on(chip);
1369
1370         return 0;
1371 }
1372 #endif
1373
1374 static const struct i2c_device_id bh1770_id[] = {
1375         {"bh1770glc", 0 },
1376         {"sfh7770", 0 },
1377         {}
1378 };
1379
1380 MODULE_DEVICE_TABLE(i2c, bh1770_id);
1381
1382 static const struct dev_pm_ops bh1770_pm_ops = {
1383         SET_SYSTEM_SLEEP_PM_OPS(bh1770_suspend, bh1770_resume)
1384         SET_RUNTIME_PM_OPS(bh1770_runtime_suspend, bh1770_runtime_resume, NULL)
1385 };
1386
1387 static struct i2c_driver bh1770_driver = {
1388         .driver  = {
1389                 .name   = "bh1770glc",
1390                 .owner  = THIS_MODULE,
1391                 .pm     = &bh1770_pm_ops,
1392         },
1393         .probe    = bh1770_probe,
1394         .remove   = __devexit_p(bh1770_remove),
1395         .id_table = bh1770_id,
1396 };
1397
1398 static int __init bh1770_init(void)
1399 {
1400         return i2c_add_driver(&bh1770_driver);
1401 }
1402
1403 static void __exit bh1770_exit(void)
1404 {
1405         i2c_del_driver(&bh1770_driver);
1406 }
1407
1408 MODULE_DESCRIPTION("BH1770GLC / SFH7770 combined ALS and proximity sensor");
1409 MODULE_AUTHOR("Samu Onkalo, Nokia Corporation");
1410 MODULE_LICENSE("GPL v2");
1411
1412 module_init(bh1770_init);
1413 module_exit(bh1770_exit);