linux/drivers/misc/bh1770glc.c
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   1/*
   2 * This file is part of the ROHM BH1770GLC / OSRAM SFH7770 sensor driver.
   3 * Chip is combined proximity and ambient light sensor.
   4 *
   5 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
   6 *
   7 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
   8 *
   9 * This program is free software; you can redistribute it and/or
  10 * modify it under the terms of the GNU General Public License
  11 * version 2 as published by the Free Software Foundation.
  12 *
  13 * This program is distributed in the hope that it will be useful, but
  14 * WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 * General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  21 * 02110-1301 USA
  22 *
  23 */
  24
  25#include <linux/kernel.h>
  26#include <linux/module.h>
  27#include <linux/i2c.h>
  28#include <linux/interrupt.h>
  29#include <linux/mutex.h>
  30#include <linux/i2c/bh1770glc.h>
  31#include <linux/regulator/consumer.h>
  32#include <linux/pm_runtime.h>
  33#include <linux/workqueue.h>
  34#include <linux/delay.h>
  35#include <linux/wait.h>
  36#include <linux/slab.h>
  37
  38#define BH1770_ALS_CONTROL      0x80 /* ALS operation mode control */
  39#define BH1770_PS_CONTROL       0x81 /* PS operation mode control */
  40#define BH1770_I_LED            0x82 /* active LED and LED1, LED2 current */
  41#define BH1770_I_LED3           0x83 /* LED3 current setting */
  42#define BH1770_ALS_PS_MEAS      0x84 /* Forced mode trigger */
  43#define BH1770_PS_MEAS_RATE     0x85 /* PS meas. rate at stand alone mode */
  44#define BH1770_ALS_MEAS_RATE    0x86 /* ALS meas. rate at stand alone mode */
  45#define BH1770_PART_ID          0x8a /* Part number and revision ID */
  46#define BH1770_MANUFACT_ID      0x8b /* Manufacturerer ID */
  47#define BH1770_ALS_DATA_0       0x8c /* ALS DATA low byte */
  48#define BH1770_ALS_DATA_1       0x8d /* ALS DATA high byte */
  49#define BH1770_ALS_PS_STATUS    0x8e /* Measurement data and int status */
  50#define BH1770_PS_DATA_LED1     0x8f /* PS data from LED1 */
  51#define BH1770_PS_DATA_LED2     0x90 /* PS data from LED2 */
  52#define BH1770_PS_DATA_LED3     0x91 /* PS data from LED3 */
  53#define BH1770_INTERRUPT        0x92 /* Interrupt setting */
  54#define BH1770_PS_TH_LED1       0x93 /* PS interrupt threshold for LED1 */
  55#define BH1770_PS_TH_LED2       0x94 /* PS interrupt threshold for LED2 */
  56#define BH1770_PS_TH_LED3       0x95 /* PS interrupt threshold for LED3 */
  57#define BH1770_ALS_TH_UP_0      0x96 /* ALS upper threshold low byte */
  58#define BH1770_ALS_TH_UP_1      0x97 /* ALS upper threshold high byte */
  59#define BH1770_ALS_TH_LOW_0     0x98 /* ALS lower threshold low byte */
  60#define BH1770_ALS_TH_LOW_1     0x99 /* ALS lower threshold high byte */
  61
  62/* MANUFACT_ID */
  63#define BH1770_MANUFACT_ROHM    0x01
  64#define BH1770_MANUFACT_OSRAM   0x03
  65
  66/* PART_ID */
  67#define BH1770_PART             0x90
  68#define BH1770_PART_MASK        0xf0
  69#define BH1770_REV_MASK         0x0f
  70#define BH1770_REV_SHIFT        0
  71#define BH1770_REV_0            0x00
  72#define BH1770_REV_1            0x01
  73
  74/* Operating modes for both */
  75#define BH1770_STANDBY          0x00
  76#define BH1770_FORCED           0x02
  77#define BH1770_STANDALONE       0x03
  78#define BH1770_SWRESET          (0x01 << 2)
  79
  80#define BH1770_PS_TRIG_MEAS     (1 << 0)
  81#define BH1770_ALS_TRIG_MEAS    (1 << 1)
  82
  83/* Interrupt control */
  84#define BH1770_INT_OUTPUT_MODE  (1 << 3) /* 0 = latched */
  85#define BH1770_INT_POLARITY     (1 << 2) /* 1 = active high */
  86#define BH1770_INT_ALS_ENA      (1 << 1)
  87#define BH1770_INT_PS_ENA       (1 << 0)
  88
  89/* Interrupt status */
  90#define BH1770_INT_LED1_DATA    (1 << 0)
  91#define BH1770_INT_LED1_INT     (1 << 1)
  92#define BH1770_INT_LED2_DATA    (1 << 2)
  93#define BH1770_INT_LED2_INT     (1 << 3)
  94#define BH1770_INT_LED3_DATA    (1 << 4)
  95#define BH1770_INT_LED3_INT     (1 << 5)
  96#define BH1770_INT_LEDS_INT     ((1 << 1) | (1 << 3) | (1 << 5))
  97#define BH1770_INT_ALS_DATA     (1 << 6)
  98#define BH1770_INT_ALS_INT      (1 << 7)
  99
 100/* Led channels */
 101#define BH1770_LED1             0x00
 102
 103#define BH1770_DISABLE          0
 104#define BH1770_ENABLE           1
 105#define BH1770_PROX_CHANNELS    1
 106
 107#define BH1770_LUX_DEFAULT_RATE 1 /* Index to lux rate table */
 108#define BH1770_PROX_DEFAULT_RATE 1 /* Direct HW value =~ 50Hz */
 109#define BH1770_PROX_DEF_RATE_THRESH 6 /* Direct HW value =~ 5 Hz */
 110#define BH1770_STARTUP_DELAY    50
 111#define BH1770_RESET_TIME       10
 112#define BH1770_TIMEOUT          2100 /* Timeout in 2.1 seconds */
 113
 114#define BH1770_LUX_RANGE        65535
 115#define BH1770_PROX_RANGE       255
 116#define BH1770_COEF_SCALER      1024
 117#define BH1770_CALIB_SCALER     8192
 118#define BH1770_LUX_NEUTRAL_CALIB_VALUE (1 * BH1770_CALIB_SCALER)
 119#define BH1770_LUX_DEF_THRES    1000
 120#define BH1770_PROX_DEF_THRES   70
 121#define BH1770_PROX_DEF_ABS_THRES   100
 122#define BH1770_DEFAULT_PERSISTENCE  10
 123#define BH1770_PROX_MAX_PERSISTENCE 50
 124#define BH1770_LUX_GA_SCALE     16384
 125#define BH1770_LUX_CF_SCALE     2048 /* CF ChipFactor */
 126#define BH1770_NEUTRAL_CF       BH1770_LUX_CF_SCALE
 127#define BH1770_LUX_CORR_SCALE   4096
 128
 129#define PROX_ABOVE_THRESHOLD    1
 130#define PROX_BELOW_THRESHOLD    0
 131
 132#define PROX_IGNORE_LUX_LIMIT   500
 133
 134struct bh1770_chip {
 135        struct bh1770_platform_data     *pdata;
 136        char                            chipname[10];
 137        u8                              revision;
 138        struct i2c_client               *client;
 139        struct regulator_bulk_data      regs[2];
 140        struct mutex                    mutex; /* avoid parallel access */
 141        wait_queue_head_t               wait;
 142
 143        bool                    int_mode_prox;
 144        bool                    int_mode_lux;
 145        struct delayed_work     prox_work;
 146        u32     lux_cf; /* Chip specific factor */
 147        u32     lux_ga;
 148        u32     lux_calib;
 149        int     lux_rate_index;
 150        u32     lux_corr;
 151        u16     lux_data_raw;
 152        u16     lux_threshold_hi;
 153        u16     lux_threshold_lo;
 154        u16     lux_thres_hi_onchip;
 155        u16     lux_thres_lo_onchip;
 156        bool    lux_wait_result;
 157
 158        int     prox_enable_count;
 159        u16     prox_coef;
 160        u16     prox_const;
 161        int     prox_rate;
 162        int     prox_rate_threshold;
 163        u8      prox_persistence;
 164        u8      prox_persistence_counter;
 165        u8      prox_data;
 166        u8      prox_threshold;
 167        u8      prox_threshold_hw;
 168        bool    prox_force_update;
 169        u8      prox_abs_thres;
 170        u8      prox_led;
 171};
 172
 173static const char reg_vcc[] = "Vcc";
 174static const char reg_vleds[] = "Vleds";
 175
 176/*
 177 * Supported stand alone rates in ms from chip data sheet
 178 * {10, 20, 30, 40, 70, 100, 200, 500, 1000, 2000};
 179 */
 180static const s16 prox_rates_hz[] = {100, 50, 33, 25, 14, 10, 5, 2};
 181static const s16 prox_rates_ms[] = {10, 20, 30, 40, 70, 100, 200, 500};
 182
 183/* Supported IR-led currents in mA */
 184static const u8 prox_curr_ma[] = {5, 10, 20, 50, 100, 150, 200};
 185
 186/*
 187 * Supported stand alone rates in ms from chip data sheet
 188 * {100, 200, 500, 1000, 2000};
 189 */
 190static const s16 lux_rates_hz[] = {10, 5, 2, 1, 0};
 191
 192/*
 193 * interrupt control functions are called while keeping chip->mutex
 194 * excluding module probe / remove
 195 */
 196static inline int bh1770_lux_interrupt_control(struct bh1770_chip *chip,
 197                                        int lux)
 198{
 199        chip->int_mode_lux = lux;
 200        /* Set interrupt modes, interrupt active low, latched */
 201        return i2c_smbus_write_byte_data(chip->client,
 202                                        BH1770_INTERRUPT,
 203                                        (lux << 1) | chip->int_mode_prox);
 204}
 205
 206static inline int bh1770_prox_interrupt_control(struct bh1770_chip *chip,
 207                                        int ps)
 208{
 209        chip->int_mode_prox = ps;
 210        return i2c_smbus_write_byte_data(chip->client,
 211                                        BH1770_INTERRUPT,
 212                                        (chip->int_mode_lux << 1) | (ps << 0));
 213}
 214
 215/* chip->mutex is always kept here */
 216static int bh1770_lux_rate(struct bh1770_chip *chip, int rate_index)
 217{
 218        /* sysfs may call this when the chip is powered off */
 219        if (pm_runtime_suspended(&chip->client->dev))
 220                return 0;
 221
 222        /* Proper proximity response needs fastest lux rate (100ms) */
 223        if (chip->prox_enable_count)
 224                rate_index = 0;
 225
 226        return i2c_smbus_write_byte_data(chip->client,
 227                                        BH1770_ALS_MEAS_RATE,
 228                                        rate_index);
 229}
 230
 231static int bh1770_prox_rate(struct bh1770_chip *chip, int mode)
 232{
 233        int rate;
 234
 235        rate = (mode == PROX_ABOVE_THRESHOLD) ?
 236                chip->prox_rate_threshold : chip->prox_rate;
 237
 238        return i2c_smbus_write_byte_data(chip->client,
 239                                        BH1770_PS_MEAS_RATE,
 240                                        rate);
 241}
 242
 243/* InfraredLED is controlled by the chip during proximity scanning */
 244static inline int bh1770_led_cfg(struct bh1770_chip *chip)
 245{
 246        /* LED cfg, current for leds 1 and 2 */
 247        return i2c_smbus_write_byte_data(chip->client,
 248                                        BH1770_I_LED,
 249                                        (BH1770_LED1 << 6) |
 250                                        (BH1770_LED_5mA << 3) |
 251                                        chip->prox_led);
 252}
 253
 254/*
 255 * Following two functions converts raw ps values from HW to normalized
 256 * values. Purpose is to compensate differences between different sensor
 257 * versions and variants so that result means about the same between
 258 * versions.
 259 */
 260static inline u8 bh1770_psraw_to_adjusted(struct bh1770_chip *chip, u8 psraw)
 261{
 262        u16 adjusted;
 263        adjusted = (u16)(((u32)(psraw + chip->prox_const) * chip->prox_coef) /
 264                BH1770_COEF_SCALER);
 265        if (adjusted > BH1770_PROX_RANGE)
 266                adjusted = BH1770_PROX_RANGE;
 267        return adjusted;
 268}
 269
 270static inline u8 bh1770_psadjusted_to_raw(struct bh1770_chip *chip, u8 ps)
 271{
 272        u16 raw;
 273
 274        raw = (((u32)ps * BH1770_COEF_SCALER) / chip->prox_coef);
 275        if (raw > chip->prox_const)
 276                raw = raw - chip->prox_const;
 277        else
 278                raw = 0;
 279        return raw;
 280}
 281
 282/*
 283 * Following two functions converts raw lux values from HW to normalized
 284 * values. Purpose is to compensate differences between different sensor
 285 * versions and variants so that result means about the same between
 286 * versions. Chip->mutex is kept when this is called.
 287 */
 288static int bh1770_prox_set_threshold(struct bh1770_chip *chip)
 289{
 290        u8 tmp = 0;
 291
 292        /* sysfs may call this when the chip is powered off */
 293        if (pm_runtime_suspended(&chip->client->dev))
 294                return 0;
 295
 296        tmp = bh1770_psadjusted_to_raw(chip, chip->prox_threshold);
 297        chip->prox_threshold_hw = tmp;
 298
 299        return  i2c_smbus_write_byte_data(chip->client, BH1770_PS_TH_LED1,
 300                                        tmp);
 301}
 302
 303static inline u16 bh1770_lux_raw_to_adjusted(struct bh1770_chip *chip, u16 raw)
 304{
 305        u32 lux;
 306        lux = ((u32)raw * chip->lux_corr) / BH1770_LUX_CORR_SCALE;
 307        return min(lux, (u32)BH1770_LUX_RANGE);
 308}
 309
 310static inline u16 bh1770_lux_adjusted_to_raw(struct bh1770_chip *chip,
 311                                        u16 adjusted)
 312{
 313        return (u32)adjusted * BH1770_LUX_CORR_SCALE / chip->lux_corr;
 314}
 315
 316/* chip->mutex is kept when this is called */
 317static int bh1770_lux_update_thresholds(struct bh1770_chip *chip,
 318                                        u16 threshold_hi, u16 threshold_lo)
 319{
 320        u8 data[4];
 321        int ret;
 322
 323        /* sysfs may call this when the chip is powered off */
 324        if (pm_runtime_suspended(&chip->client->dev))
 325                return 0;
 326
 327        /*
 328         * Compensate threshold values with the correction factors if not
 329         * set to minimum or maximum.
 330         * Min & max values disables interrupts.
 331         */
 332        if (threshold_hi != BH1770_LUX_RANGE && threshold_hi != 0)
 333                threshold_hi = bh1770_lux_adjusted_to_raw(chip, threshold_hi);
 334
 335        if (threshold_lo != BH1770_LUX_RANGE && threshold_lo != 0)
 336                threshold_lo = bh1770_lux_adjusted_to_raw(chip, threshold_lo);
 337
 338        if (chip->lux_thres_hi_onchip == threshold_hi &&
 339            chip->lux_thres_lo_onchip == threshold_lo)
 340                return 0;
 341
 342        chip->lux_thres_hi_onchip = threshold_hi;
 343        chip->lux_thres_lo_onchip = threshold_lo;
 344
 345        data[0] = threshold_hi;
 346        data[1] = threshold_hi >> 8;
 347        data[2] = threshold_lo;
 348        data[3] = threshold_lo >> 8;
 349
 350        ret = i2c_smbus_write_i2c_block_data(chip->client,
 351                                        BH1770_ALS_TH_UP_0,
 352                                        ARRAY_SIZE(data),
 353                                        data);
 354        return ret;
 355}
 356
 357static int bh1770_lux_get_result(struct bh1770_chip *chip)
 358{
 359        u16 data;
 360        int ret;
 361
 362        ret = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_DATA_0);
 363        if (ret < 0)
 364                return ret;
 365
 366        data = ret & 0xff;
 367        ret = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_DATA_1);
 368        if (ret < 0)
 369                return ret;
 370
 371        chip->lux_data_raw = data | ((ret & 0xff) << 8);
 372
 373        return 0;
 374}
 375
 376/* Calculate correction value which contains chip and device specific parts */
 377static u32 bh1770_get_corr_value(struct bh1770_chip *chip)
 378{
 379        u32 tmp;
 380        /* Impact of glass attenuation correction */
 381        tmp = (BH1770_LUX_CORR_SCALE * chip->lux_ga) / BH1770_LUX_GA_SCALE;
 382        /* Impact of chip factor correction */
 383        tmp = (tmp * chip->lux_cf) / BH1770_LUX_CF_SCALE;
 384        /* Impact of Device specific calibration correction */
 385        tmp = (tmp * chip->lux_calib) / BH1770_CALIB_SCALER;
 386        return tmp;
 387}
 388
 389static int bh1770_lux_read_result(struct bh1770_chip *chip)
 390{
 391        bh1770_lux_get_result(chip);
 392        return bh1770_lux_raw_to_adjusted(chip, chip->lux_data_raw);
 393}
 394
 395/*
 396 * Chip on / off functions are called while keeping mutex except probe
 397 * or remove phase
 398 */
 399static int bh1770_chip_on(struct bh1770_chip *chip)
 400{
 401        int ret = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
 402                                        chip->regs);
 403        if (ret < 0)
 404                return ret;
 405
 406        usleep_range(BH1770_STARTUP_DELAY, BH1770_STARTUP_DELAY * 2);
 407
 408        /* Reset the chip */
 409        i2c_smbus_write_byte_data(chip->client, BH1770_ALS_CONTROL,
 410                                BH1770_SWRESET);
 411        usleep_range(BH1770_RESET_TIME, BH1770_RESET_TIME * 2);
 412
 413        /*
 414         * ALS is started always since proximity needs als results
 415         * for realibility estimation.
 416         * Let's assume dark until the first ALS measurement is ready.
 417         */
 418        chip->lux_data_raw = 0;
 419        chip->prox_data = 0;
 420        ret = i2c_smbus_write_byte_data(chip->client,
 421                                        BH1770_ALS_CONTROL, BH1770_STANDALONE);
 422
 423        /* Assume reset defaults */
 424        chip->lux_thres_hi_onchip = BH1770_LUX_RANGE;
 425        chip->lux_thres_lo_onchip = 0;
 426
 427        return ret;
 428}
 429
 430static void bh1770_chip_off(struct bh1770_chip *chip)
 431{
 432        i2c_smbus_write_byte_data(chip->client,
 433                                        BH1770_INTERRUPT, BH1770_DISABLE);
 434        i2c_smbus_write_byte_data(chip->client,
 435                                BH1770_ALS_CONTROL, BH1770_STANDBY);
 436        i2c_smbus_write_byte_data(chip->client,
 437                                BH1770_PS_CONTROL, BH1770_STANDBY);
 438        regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
 439}
 440
 441/* chip->mutex is kept when this is called */
 442static int bh1770_prox_mode_control(struct bh1770_chip *chip)
 443{
 444        if (chip->prox_enable_count) {
 445                chip->prox_force_update = true; /* Force immediate update */
 446
 447                bh1770_lux_rate(chip, chip->lux_rate_index);
 448                bh1770_prox_set_threshold(chip);
 449                bh1770_led_cfg(chip);
 450                bh1770_prox_rate(chip, PROX_BELOW_THRESHOLD);
 451                bh1770_prox_interrupt_control(chip, BH1770_ENABLE);
 452                i2c_smbus_write_byte_data(chip->client,
 453                                        BH1770_PS_CONTROL, BH1770_STANDALONE);
 454        } else {
 455                chip->prox_data = 0;
 456                bh1770_lux_rate(chip, chip->lux_rate_index);
 457                bh1770_prox_interrupt_control(chip, BH1770_DISABLE);
 458                i2c_smbus_write_byte_data(chip->client,
 459                                        BH1770_PS_CONTROL, BH1770_STANDBY);
 460        }
 461        return 0;
 462}
 463
 464/* chip->mutex is kept when this is called */
 465static int bh1770_prox_read_result(struct bh1770_chip *chip)
 466{
 467        int ret;
 468        bool above;
 469        u8 mode;
 470
 471        ret = i2c_smbus_read_byte_data(chip->client, BH1770_PS_DATA_LED1);
 472        if (ret < 0)
 473                goto out;
 474
 475        if (ret > chip->prox_threshold_hw)
 476                above = true;
 477        else
 478                above = false;
 479
 480        /*
 481         * when ALS levels goes above limit, proximity result may be
 482         * false proximity. Thus ignore the result. With real proximity
 483         * there is a shadow causing low als levels.
 484         */
 485        if (chip->lux_data_raw > PROX_IGNORE_LUX_LIMIT)
 486                ret = 0;
 487
 488        chip->prox_data = bh1770_psraw_to_adjusted(chip, ret);
 489
 490        /* Strong proximity level or force mode requires immediate response */
 491        if (chip->prox_data >= chip->prox_abs_thres ||
 492            chip->prox_force_update)
 493                chip->prox_persistence_counter = chip->prox_persistence;
 494
 495        chip->prox_force_update = false;
 496
 497        /* Persistence filttering to reduce false proximity events */
 498        if (likely(above)) {
 499                if (chip->prox_persistence_counter < chip->prox_persistence) {
 500                        chip->prox_persistence_counter++;
 501                        ret = -ENODATA;
 502                } else {
 503                        mode = PROX_ABOVE_THRESHOLD;
 504                        ret = 0;
 505                }
 506        } else {
 507                chip->prox_persistence_counter = 0;
 508                mode = PROX_BELOW_THRESHOLD;
 509                chip->prox_data = 0;
 510                ret = 0;
 511        }
 512
 513        /* Set proximity detection rate based on above or below value */
 514        if (ret == 0) {
 515                bh1770_prox_rate(chip, mode);
 516                sysfs_notify(&chip->client->dev.kobj, NULL, "prox0_raw");
 517        }
 518out:
 519        return ret;
 520}
 521
 522static int bh1770_detect(struct bh1770_chip *chip)
 523{
 524        struct i2c_client *client = chip->client;
 525        s32 ret;
 526        u8 manu, part;
 527
 528        ret = i2c_smbus_read_byte_data(client, BH1770_MANUFACT_ID);
 529        if (ret < 0)
 530                goto error;
 531        manu = (u8)ret;
 532
 533        ret = i2c_smbus_read_byte_data(client, BH1770_PART_ID);
 534        if (ret < 0)
 535                goto error;
 536        part = (u8)ret;
 537
 538        chip->revision = (part & BH1770_REV_MASK) >> BH1770_REV_SHIFT;
 539        chip->prox_coef = BH1770_COEF_SCALER;
 540        chip->prox_const = 0;
 541        chip->lux_cf = BH1770_NEUTRAL_CF;
 542
 543        if ((manu == BH1770_MANUFACT_ROHM) &&
 544            ((part & BH1770_PART_MASK) == BH1770_PART)) {
 545                snprintf(chip->chipname, sizeof(chip->chipname), "BH1770GLC");
 546                return 0;
 547        }
 548
 549        if ((manu == BH1770_MANUFACT_OSRAM) &&
 550            ((part & BH1770_PART_MASK) == BH1770_PART)) {
 551                snprintf(chip->chipname, sizeof(chip->chipname), "SFH7770");
 552                /* Values selected by comparing different versions */
 553                chip->prox_coef = 819; /* 0.8 * BH1770_COEF_SCALER */
 554                chip->prox_const = 40;
 555                return 0;
 556        }
 557
 558        ret = -ENODEV;
 559error:
 560        dev_dbg(&client->dev, "BH1770 or SFH7770 not found\n");
 561
 562        return ret;
 563}
 564
 565/*
 566 * This work is re-scheduled at every proximity interrupt.
 567 * If this work is running, it means that there hasn't been any
 568 * proximity interrupt in time. Situation is handled as no-proximity.
 569 * It would be nice to have low-threshold interrupt or interrupt
 570 * when measurement and hi-threshold are both 0. But neither of those exists.
 571 * This is a workaroud for missing HW feature.
 572 */
 573
 574static void bh1770_prox_work(struct work_struct *work)
 575{
 576        struct bh1770_chip *chip =
 577                container_of(work, struct bh1770_chip, prox_work.work);
 578
 579        mutex_lock(&chip->mutex);
 580        bh1770_prox_read_result(chip);
 581        mutex_unlock(&chip->mutex);
 582}
 583
 584/* This is threaded irq handler */
 585static irqreturn_t bh1770_irq(int irq, void *data)
 586{
 587        struct bh1770_chip *chip = data;
 588        int status;
 589        int rate = 0;
 590
 591        mutex_lock(&chip->mutex);
 592        status = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_PS_STATUS);
 593
 594        /* Acknowledge interrupt by reading this register */
 595        i2c_smbus_read_byte_data(chip->client, BH1770_INTERRUPT);
 596
 597        /*
 598         * Check if there is fresh data available for als.
 599         * If this is the very first data, update thresholds after that.
 600         */
 601        if (status & BH1770_INT_ALS_DATA) {
 602                bh1770_lux_get_result(chip);
 603                if (unlikely(chip->lux_wait_result)) {
 604                        chip->lux_wait_result = false;
 605                        wake_up(&chip->wait);
 606                        bh1770_lux_update_thresholds(chip,
 607                                                chip->lux_threshold_hi,
 608                                                chip->lux_threshold_lo);
 609                }
 610        }
 611
 612        /* Disable interrupt logic to guarantee acknowledgement */
 613        i2c_smbus_write_byte_data(chip->client, BH1770_INTERRUPT,
 614                                  (0 << 1) | (0 << 0));
 615
 616        if ((status & BH1770_INT_ALS_INT))
 617                sysfs_notify(&chip->client->dev.kobj, NULL, "lux0_input");
 618
 619        if (chip->int_mode_prox && (status & BH1770_INT_LEDS_INT)) {
 620                rate = prox_rates_ms[chip->prox_rate_threshold];
 621                bh1770_prox_read_result(chip);
 622        }
 623
 624        /* Re-enable interrupt logic */
 625        i2c_smbus_write_byte_data(chip->client, BH1770_INTERRUPT,
 626                                  (chip->int_mode_lux << 1) |
 627                                  (chip->int_mode_prox << 0));
 628        mutex_unlock(&chip->mutex);
 629
 630        /*
 631         * Can't cancel work while keeping mutex since the work uses the
 632         * same mutex.
 633         */
 634        if (rate) {
 635                /*
 636                 * Simulate missing no-proximity interrupt 50ms after the
 637                 * next expected interrupt time.
 638                 */
 639                cancel_delayed_work_sync(&chip->prox_work);
 640                schedule_delayed_work(&chip->prox_work,
 641                                msecs_to_jiffies(rate + 50));
 642        }
 643        return IRQ_HANDLED;
 644}
 645
 646static ssize_t bh1770_power_state_store(struct device *dev,
 647                                      struct device_attribute *attr,
 648                                      const char *buf, size_t count)
 649{
 650        struct bh1770_chip *chip =  dev_get_drvdata(dev);
 651        unsigned long value;
 652        ssize_t ret;
 653
 654        ret = kstrtoul(buf, 0, &value);
 655        if (ret)
 656                return ret;
 657
 658        mutex_lock(&chip->mutex);
 659        if (value) {
 660                pm_runtime_get_sync(dev);
 661
 662                ret = bh1770_lux_rate(chip, chip->lux_rate_index);
 663                if (ret < 0) {
 664                        pm_runtime_put(dev);
 665                        goto leave;
 666                }
 667
 668                ret = bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
 669                if (ret < 0) {
 670                        pm_runtime_put(dev);
 671                        goto leave;
 672                }
 673
 674                /* This causes interrupt after the next measurement cycle */
 675                bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
 676                                        BH1770_LUX_DEF_THRES);
 677                /* Inform that we are waiting for a result from ALS */
 678                chip->lux_wait_result = true;
 679                bh1770_prox_mode_control(chip);
 680        } else if (!pm_runtime_suspended(dev)) {
 681                pm_runtime_put(dev);
 682        }
 683        ret = count;
 684leave:
 685        mutex_unlock(&chip->mutex);
 686        return ret;
 687}
 688
 689static ssize_t bh1770_power_state_show(struct device *dev,
 690                                   struct device_attribute *attr, char *buf)
 691{
 692        return sprintf(buf, "%d\n", !pm_runtime_suspended(dev));
 693}
 694
 695static ssize_t bh1770_lux_result_show(struct device *dev,
 696                                   struct device_attribute *attr, char *buf)
 697{
 698        struct bh1770_chip *chip =  dev_get_drvdata(dev);
 699        ssize_t ret;
 700        long timeout;
 701
 702        if (pm_runtime_suspended(dev))
 703                return -EIO; /* Chip is not enabled at all */
 704
 705        timeout = wait_event_interruptible_timeout(chip->wait,
 706                                        !chip->lux_wait_result,
 707                                        msecs_to_jiffies(BH1770_TIMEOUT));
 708        if (!timeout)
 709                return -EIO;
 710
 711        mutex_lock(&chip->mutex);
 712        ret = sprintf(buf, "%d\n", bh1770_lux_read_result(chip));
 713        mutex_unlock(&chip->mutex);
 714
 715        return ret;
 716}
 717
 718static ssize_t bh1770_lux_range_show(struct device *dev,
 719                                   struct device_attribute *attr, char *buf)
 720{
 721        return sprintf(buf, "%d\n", BH1770_LUX_RANGE);
 722}
 723
 724static ssize_t bh1770_prox_enable_store(struct device *dev,
 725                                      struct device_attribute *attr,
 726                                      const char *buf, size_t count)
 727{
 728        struct bh1770_chip *chip =  dev_get_drvdata(dev);
 729        unsigned long value;
 730        int ret;
 731
 732        ret = kstrtoul(buf, 0, &value);
 733        if (ret)
 734                return ret;
 735
 736        mutex_lock(&chip->mutex);
 737        /* Assume no proximity. Sensor will tell real state soon */
 738        if (!chip->prox_enable_count)
 739                chip->prox_data = 0;
 740
 741        if (value)
 742                chip->prox_enable_count++;
 743        else if (chip->prox_enable_count > 0)
 744                chip->prox_enable_count--;
 745        else
 746                goto leave;
 747
 748        /* Run control only when chip is powered on */
 749        if (!pm_runtime_suspended(dev))
 750                bh1770_prox_mode_control(chip);
 751leave:
 752        mutex_unlock(&chip->mutex);
 753        return count;
 754}
 755
 756static ssize_t bh1770_prox_enable_show(struct device *dev,
 757                                   struct device_attribute *attr, char *buf)
 758{
 759        struct bh1770_chip *chip =  dev_get_drvdata(dev);
 760        ssize_t len;
 761
 762        mutex_lock(&chip->mutex);
 763        len = sprintf(buf, "%d\n", chip->prox_enable_count);
 764        mutex_unlock(&chip->mutex);
 765        return len;
 766}
 767
 768static ssize_t bh1770_prox_result_show(struct device *dev,
 769                                   struct device_attribute *attr, char *buf)
 770{
 771        struct bh1770_chip *chip =  dev_get_drvdata(dev);
 772        ssize_t ret;
 773
 774        mutex_lock(&chip->mutex);
 775        if (chip->prox_enable_count && !pm_runtime_suspended(dev))
 776                ret = sprintf(buf, "%d\n", chip->prox_data);
 777        else
 778                ret = -EIO;
 779        mutex_unlock(&chip->mutex);
 780        return ret;
 781}
 782
 783static ssize_t bh1770_prox_range_show(struct device *dev,
 784                                   struct device_attribute *attr, char *buf)
 785{
 786        return sprintf(buf, "%d\n", BH1770_PROX_RANGE);
 787}
 788
 789static ssize_t bh1770_get_prox_rate_avail(struct device *dev,
 790                                   struct device_attribute *attr, char *buf)
 791{
 792        int i;
 793        int pos = 0;
 794        for (i = 0; i < ARRAY_SIZE(prox_rates_hz); i++)
 795                pos += sprintf(buf + pos, "%d ", prox_rates_hz[i]);
 796        sprintf(buf + pos - 1, "\n");
 797        return pos;
 798}
 799
 800static ssize_t bh1770_get_prox_rate_above(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_threshold]);
 805}
 806
 807static ssize_t bh1770_get_prox_rate_below(struct device *dev,
 808                                   struct device_attribute *attr, char *buf)
 809{
 810        struct bh1770_chip *chip =  dev_get_drvdata(dev);
 811        return sprintf(buf, "%d\n", prox_rates_hz[chip->prox_rate]);
 812}
 813
 814static int bh1770_prox_rate_validate(int rate)
 815{
 816        int i;
 817
 818        for (i = 0; i < ARRAY_SIZE(prox_rates_hz) - 1; i++)
 819                if (rate >= prox_rates_hz[i])
 820                        break;
 821        return i;
 822}
 823
 824static ssize_t bh1770_set_prox_rate_above(struct device *dev,
 825                                        struct device_attribute *attr,
 826                                        const char *buf, size_t count)
 827{
 828        struct bh1770_chip *chip =  dev_get_drvdata(dev);
 829        unsigned long value;
 830        int ret;
 831
 832        ret = kstrtoul(buf, 0, &value);
 833        if (ret)
 834                return ret;
 835
 836        mutex_lock(&chip->mutex);
 837        chip->prox_rate_threshold = bh1770_prox_rate_validate(value);
 838        mutex_unlock(&chip->mutex);
 839        return count;
 840}
 841
 842static ssize_t bh1770_set_prox_rate_below(struct device *dev,
 843                                        struct device_attribute *attr,
 844                                        const char *buf, size_t count)
 845{
 846        struct bh1770_chip *chip =  dev_get_drvdata(dev);
 847        unsigned long value;
 848        int ret;
 849
 850        ret = kstrtoul(buf, 0, &value);
 851        if (ret)
 852                return ret;
 853
 854        mutex_lock(&chip->mutex);
 855        chip->prox_rate = bh1770_prox_rate_validate(value);
 856        mutex_unlock(&chip->mutex);
 857        return count;
 858}
 859
 860static ssize_t bh1770_get_prox_thres(struct device *dev,
 861                                   struct device_attribute *attr, char *buf)
 862{
 863        struct bh1770_chip *chip =  dev_get_drvdata(dev);
 864        return sprintf(buf, "%d\n", chip->prox_threshold);
 865}
 866
 867static ssize_t bh1770_set_prox_thres(struct device *dev,
 868                                      struct device_attribute *attr,
 869                                      const char *buf, size_t count)
 870{
 871        struct bh1770_chip *chip =  dev_get_drvdata(dev);
 872        unsigned long value;
 873        int ret;
 874
 875        ret = kstrtoul(buf, 0, &value);
 876        if (ret)
 877                return ret;
 878
 879        if (value > BH1770_PROX_RANGE)
 880                return -EINVAL;
 881
 882        mutex_lock(&chip->mutex);
 883        chip->prox_threshold = value;
 884        ret = bh1770_prox_set_threshold(chip);
 885        mutex_unlock(&chip->mutex);
 886        if (ret < 0)
 887                return ret;
 888        return count;
 889}
 890
 891static ssize_t bh1770_prox_persistence_show(struct device *dev,
 892                                 struct device_attribute *attr, char *buf)
 893{
 894        struct bh1770_chip *chip = dev_get_drvdata(dev);
 895
 896        return sprintf(buf, "%u\n", chip->prox_persistence);
 897}
 898
 899static ssize_t bh1770_prox_persistence_store(struct device *dev,
 900                                struct device_attribute *attr,
 901                                const char *buf, size_t len)
 902{
 903        struct bh1770_chip *chip = dev_get_drvdata(dev);
 904        unsigned long value;
 905        int ret;
 906
 907        ret = kstrtoul(buf, 0, &value);
 908        if (ret)
 909                return ret;
 910
 911        if (value > BH1770_PROX_MAX_PERSISTENCE)
 912                return -EINVAL;
 913
 914        chip->prox_persistence = value;
 915
 916        return len;
 917}
 918
 919static ssize_t bh1770_prox_abs_thres_show(struct device *dev,
 920                                 struct device_attribute *attr, char *buf)
 921{
 922        struct bh1770_chip *chip = dev_get_drvdata(dev);
 923        return sprintf(buf, "%u\n", chip->prox_abs_thres);
 924}
 925
 926static ssize_t bh1770_prox_abs_thres_store(struct device *dev,
 927                                struct device_attribute *attr,
 928                                const char *buf, size_t len)
 929{
 930        struct bh1770_chip *chip = dev_get_drvdata(dev);
 931        unsigned long value;
 932        int ret;
 933
 934        ret = kstrtoul(buf, 0, &value);
 935        if (ret)
 936                return ret;
 937
 938        if (value > BH1770_PROX_RANGE)
 939                return -EINVAL;
 940
 941        chip->prox_abs_thres = value;
 942
 943        return len;
 944}
 945
 946static ssize_t bh1770_chip_id_show(struct device *dev,
 947                                   struct device_attribute *attr, char *buf)
 948{
 949        struct bh1770_chip *chip =  dev_get_drvdata(dev);
 950        return sprintf(buf, "%s rev %d\n", chip->chipname, chip->revision);
 951}
 952
 953static ssize_t bh1770_lux_calib_default_show(struct device *dev,
 954                                 struct device_attribute *attr, char *buf)
 955{
 956        return sprintf(buf, "%u\n", BH1770_CALIB_SCALER);
 957}
 958
 959static ssize_t bh1770_lux_calib_show(struct device *dev,
 960                                 struct device_attribute *attr, char *buf)
 961{
 962        struct bh1770_chip *chip = dev_get_drvdata(dev);
 963        ssize_t len;
 964
 965        mutex_lock(&chip->mutex);
 966        len = sprintf(buf, "%u\n", chip->lux_calib);
 967        mutex_unlock(&chip->mutex);
 968        return len;
 969}
 970
 971static ssize_t bh1770_lux_calib_store(struct device *dev,
 972                                  struct device_attribute *attr,
 973                                  const char *buf, size_t len)
 974{
 975        struct bh1770_chip *chip = dev_get_drvdata(dev);
 976        unsigned long value;
 977        u32 old_calib;
 978        u32 new_corr;
 979        int ret;
 980
 981        ret = kstrtoul(buf, 0, &value);
 982        if (ret)
 983                return ret;
 984
 985        mutex_lock(&chip->mutex);
 986        old_calib = chip->lux_calib;
 987        chip->lux_calib = value;
 988        new_corr = bh1770_get_corr_value(chip);
 989        if (new_corr == 0) {
 990                chip->lux_calib = old_calib;
 991                mutex_unlock(&chip->mutex);
 992                return -EINVAL;
 993        }
 994        chip->lux_corr = new_corr;
 995        /* Refresh thresholds on HW after changing correction value */
 996        bh1770_lux_update_thresholds(chip, chip->lux_threshold_hi,
 997                                chip->lux_threshold_lo);
 998
 999        mutex_unlock(&chip->mutex);
1000
1001        return len;
1002}
1003
1004static ssize_t bh1770_get_lux_rate_avail(struct device *dev,
1005                                   struct device_attribute *attr, char *buf)
1006{
1007        int i;
1008        int pos = 0;
1009        for (i = 0; i < ARRAY_SIZE(lux_rates_hz); i++)
1010                pos += sprintf(buf + pos, "%d ", lux_rates_hz[i]);
1011        sprintf(buf + pos - 1, "\n");
1012        return pos;
1013}
1014
1015static ssize_t bh1770_get_lux_rate(struct device *dev,
1016                                   struct device_attribute *attr, char *buf)
1017{
1018        struct bh1770_chip *chip =  dev_get_drvdata(dev);
1019        return sprintf(buf, "%d\n", lux_rates_hz[chip->lux_rate_index]);
1020}
1021
1022static ssize_t bh1770_set_lux_rate(struct device *dev,
1023                                      struct device_attribute *attr,
1024                                      const char *buf, size_t count)
1025{
1026        struct bh1770_chip *chip =  dev_get_drvdata(dev);
1027        unsigned long rate_hz;
1028        int ret, i;
1029
1030        ret = kstrtoul(buf, 0, &rate_hz);
1031        if (ret)
1032                return ret;
1033
1034        for (i = 0; i < ARRAY_SIZE(lux_rates_hz) - 1; i++)
1035                if (rate_hz >= lux_rates_hz[i])
1036                        break;
1037
1038        mutex_lock(&chip->mutex);
1039        chip->lux_rate_index = i;
1040        ret = bh1770_lux_rate(chip, i);
1041        mutex_unlock(&chip->mutex);
1042
1043        if (ret < 0)
1044                return ret;
1045
1046        return count;
1047}
1048
1049static ssize_t bh1770_get_lux_thresh_above(struct device *dev,
1050                                   struct device_attribute *attr, char *buf)
1051{
1052        struct bh1770_chip *chip =  dev_get_drvdata(dev);
1053        return sprintf(buf, "%d\n", chip->lux_threshold_hi);
1054}
1055
1056static ssize_t bh1770_get_lux_thresh_below(struct device *dev,
1057                                   struct device_attribute *attr, char *buf)
1058{
1059        struct bh1770_chip *chip =  dev_get_drvdata(dev);
1060        return sprintf(buf, "%d\n", chip->lux_threshold_lo);
1061}
1062
1063static ssize_t bh1770_set_lux_thresh(struct bh1770_chip *chip, u16 *target,
1064                                const char *buf)
1065{
1066        unsigned long thresh;
1067        int ret;
1068
1069        ret = kstrtoul(buf, 0, &thresh);
1070        if (ret)
1071                return ret;
1072
1073        if (thresh > BH1770_LUX_RANGE)
1074                return -EINVAL;
1075
1076        mutex_lock(&chip->mutex);
1077        *target = thresh;
1078        /*
1079         * Don't update values in HW if we are still waiting for
1080         * first interrupt to come after device handle open call.
1081         */
1082        if (!chip->lux_wait_result)
1083                ret = bh1770_lux_update_thresholds(chip,
1084                                                chip->lux_threshold_hi,
1085                                                chip->lux_threshold_lo);
1086        mutex_unlock(&chip->mutex);
1087        return ret;
1088
1089}
1090
1091static ssize_t bh1770_set_lux_thresh_above(struct device *dev,
1092                                  struct device_attribute *attr,
1093                                  const char *buf, size_t len)
1094{
1095        struct bh1770_chip *chip =  dev_get_drvdata(dev);
1096        int ret = bh1770_set_lux_thresh(chip, &chip->lux_threshold_hi, buf);
1097        if (ret < 0)
1098                return ret;
1099        return len;
1100}
1101
1102static ssize_t bh1770_set_lux_thresh_below(struct device *dev,
1103                                  struct device_attribute *attr,
1104                                  const char *buf, size_t len)
1105{
1106        struct bh1770_chip *chip =  dev_get_drvdata(dev);
1107        int ret = bh1770_set_lux_thresh(chip, &chip->lux_threshold_lo, buf);
1108        if (ret < 0)
1109                return ret;
1110        return len;
1111}
1112
1113static DEVICE_ATTR(prox0_raw_en, S_IRUGO | S_IWUSR, bh1770_prox_enable_show,
1114                                                bh1770_prox_enable_store);
1115static DEVICE_ATTR(prox0_thresh_above1_value, S_IRUGO | S_IWUSR,
1116                                                bh1770_prox_abs_thres_show,
1117                                                bh1770_prox_abs_thres_store);
1118static DEVICE_ATTR(prox0_thresh_above0_value, S_IRUGO | S_IWUSR,
1119                                                bh1770_get_prox_thres,
1120                                                bh1770_set_prox_thres);
1121static DEVICE_ATTR(prox0_raw, S_IRUGO, bh1770_prox_result_show, NULL);
1122static DEVICE_ATTR(prox0_sensor_range, S_IRUGO, bh1770_prox_range_show, NULL);
1123static DEVICE_ATTR(prox0_thresh_above_count, S_IRUGO | S_IWUSR,
1124                                                bh1770_prox_persistence_show,
1125                                                bh1770_prox_persistence_store);
1126static DEVICE_ATTR(prox0_rate_above, S_IRUGO | S_IWUSR,
1127                                                bh1770_get_prox_rate_above,
1128                                                bh1770_set_prox_rate_above);
1129static DEVICE_ATTR(prox0_rate_below, S_IRUGO | S_IWUSR,
1130                                                bh1770_get_prox_rate_below,
1131                                                bh1770_set_prox_rate_below);
1132static DEVICE_ATTR(prox0_rate_avail, S_IRUGO, bh1770_get_prox_rate_avail, NULL);
1133
1134static DEVICE_ATTR(lux0_calibscale, S_IRUGO | S_IWUSR, bh1770_lux_calib_show,
1135                                                bh1770_lux_calib_store);
1136static DEVICE_ATTR(lux0_calibscale_default, S_IRUGO,
1137                                                bh1770_lux_calib_default_show,
1138                                                NULL);
1139static DEVICE_ATTR(lux0_input, S_IRUGO, bh1770_lux_result_show, NULL);
1140static DEVICE_ATTR(lux0_sensor_range, S_IRUGO, bh1770_lux_range_show, NULL);
1141static DEVICE_ATTR(lux0_rate, S_IRUGO | S_IWUSR, bh1770_get_lux_rate,
1142                                                bh1770_set_lux_rate);
1143static DEVICE_ATTR(lux0_rate_avail, S_IRUGO, bh1770_get_lux_rate_avail, NULL);
1144static DEVICE_ATTR(lux0_thresh_above_value, S_IRUGO | S_IWUSR,
1145                                                bh1770_get_lux_thresh_above,
1146                                                bh1770_set_lux_thresh_above);
1147static DEVICE_ATTR(lux0_thresh_below_value, S_IRUGO | S_IWUSR,
1148                                                bh1770_get_lux_thresh_below,
1149                                                bh1770_set_lux_thresh_below);
1150static DEVICE_ATTR(chip_id, S_IRUGO, bh1770_chip_id_show, NULL);
1151static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR, bh1770_power_state_show,
1152                                                 bh1770_power_state_store);
1153
1154
1155static struct attribute *sysfs_attrs[] = {
1156        &dev_attr_lux0_calibscale.attr,
1157        &dev_attr_lux0_calibscale_default.attr,
1158        &dev_attr_lux0_input.attr,
1159        &dev_attr_lux0_sensor_range.attr,
1160        &dev_attr_lux0_rate.attr,
1161        &dev_attr_lux0_rate_avail.attr,
1162        &dev_attr_lux0_thresh_above_value.attr,
1163        &dev_attr_lux0_thresh_below_value.attr,
1164        &dev_attr_prox0_raw.attr,
1165        &dev_attr_prox0_sensor_range.attr,
1166        &dev_attr_prox0_raw_en.attr,
1167        &dev_attr_prox0_thresh_above_count.attr,
1168        &dev_attr_prox0_rate_above.attr,
1169        &dev_attr_prox0_rate_below.attr,
1170        &dev_attr_prox0_rate_avail.attr,
1171        &dev_attr_prox0_thresh_above0_value.attr,
1172        &dev_attr_prox0_thresh_above1_value.attr,
1173        &dev_attr_chip_id.attr,
1174        &dev_attr_power_state.attr,
1175        NULL
1176};
1177
1178static struct attribute_group bh1770_attribute_group = {
1179        .attrs = sysfs_attrs
1180};
1181
1182static int bh1770_probe(struct i2c_client *client,
1183                                const struct i2c_device_id *id)
1184{
1185        struct bh1770_chip *chip;
1186        int err;
1187
1188        chip = devm_kzalloc(&client->dev, sizeof *chip, GFP_KERNEL);
1189        if (!chip)
1190                return -ENOMEM;
1191
1192        i2c_set_clientdata(client, chip);
1193        chip->client  = client;
1194
1195        mutex_init(&chip->mutex);
1196        init_waitqueue_head(&chip->wait);
1197        INIT_DELAYED_WORK(&chip->prox_work, bh1770_prox_work);
1198
1199        if (client->dev.platform_data == NULL) {
1200                dev_err(&client->dev, "platform data is mandatory\n");
1201                return -EINVAL;
1202        }
1203
1204        chip->pdata             = client->dev.platform_data;
1205        chip->lux_calib         = BH1770_LUX_NEUTRAL_CALIB_VALUE;
1206        chip->lux_rate_index    = BH1770_LUX_DEFAULT_RATE;
1207        chip->lux_threshold_lo  = BH1770_LUX_DEF_THRES;
1208        chip->lux_threshold_hi  = BH1770_LUX_DEF_THRES;
1209
1210        if (chip->pdata->glass_attenuation == 0)
1211                chip->lux_ga = BH1770_NEUTRAL_GA;
1212        else
1213                chip->lux_ga = chip->pdata->glass_attenuation;
1214
1215        chip->prox_threshold    = BH1770_PROX_DEF_THRES;
1216        chip->prox_led          = chip->pdata->led_def_curr;
1217        chip->prox_abs_thres    = BH1770_PROX_DEF_ABS_THRES;
1218        chip->prox_persistence  = BH1770_DEFAULT_PERSISTENCE;
1219        chip->prox_rate_threshold = BH1770_PROX_DEF_RATE_THRESH;
1220        chip->prox_rate         = BH1770_PROX_DEFAULT_RATE;
1221        chip->prox_data         = 0;
1222
1223        chip->regs[0].supply = reg_vcc;
1224        chip->regs[1].supply = reg_vleds;
1225
1226        err = devm_regulator_bulk_get(&client->dev,
1227                                      ARRAY_SIZE(chip->regs), chip->regs);
1228        if (err < 0) {
1229                dev_err(&client->dev, "Cannot get regulators\n");
1230                return err;
1231        }
1232
1233        err = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
1234                                chip->regs);
1235        if (err < 0) {
1236                dev_err(&client->dev, "Cannot enable regulators\n");
1237                return err;
1238        }
1239
1240        usleep_range(BH1770_STARTUP_DELAY, BH1770_STARTUP_DELAY * 2);
1241        err = bh1770_detect(chip);
1242        if (err < 0)
1243                goto fail0;
1244
1245        /* Start chip */
1246        bh1770_chip_on(chip);
1247        pm_runtime_set_active(&client->dev);
1248        pm_runtime_enable(&client->dev);
1249
1250        chip->lux_corr = bh1770_get_corr_value(chip);
1251        if (chip->lux_corr == 0) {
1252                dev_err(&client->dev, "Improper correction values\n");
1253                err = -EINVAL;
1254                goto fail0;
1255        }
1256
1257        if (chip->pdata->setup_resources) {
1258                err = chip->pdata->setup_resources();
1259                if (err) {
1260                        err = -EINVAL;
1261                        goto fail0;
1262                }
1263        }
1264
1265        err = sysfs_create_group(&chip->client->dev.kobj,
1266                                &bh1770_attribute_group);
1267        if (err < 0) {
1268                dev_err(&chip->client->dev, "Sysfs registration failed\n");
1269                goto fail1;
1270        }
1271
1272        /*
1273         * Chip needs level triggered interrupt to work. However,
1274         * level triggering doesn't work always correctly with power
1275         * management. Select both
1276         */
1277        err = request_threaded_irq(client->irq, NULL,
1278                                bh1770_irq,
1279                                IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
1280                                IRQF_TRIGGER_LOW,
1281                                "bh1770", chip);
1282        if (err) {
1283                dev_err(&client->dev, "could not get IRQ %d\n",
1284                        client->irq);
1285                goto fail2;
1286        }
1287        regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
1288        return err;
1289fail2:
1290        sysfs_remove_group(&chip->client->dev.kobj,
1291                        &bh1770_attribute_group);
1292fail1:
1293        if (chip->pdata->release_resources)
1294                chip->pdata->release_resources();
1295fail0:
1296        regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
1297        return err;
1298}
1299
1300static int bh1770_remove(struct i2c_client *client)
1301{
1302        struct bh1770_chip *chip = i2c_get_clientdata(client);
1303
1304        free_irq(client->irq, chip);
1305
1306        sysfs_remove_group(&chip->client->dev.kobj,
1307                        &bh1770_attribute_group);
1308
1309        if (chip->pdata->release_resources)
1310                chip->pdata->release_resources();
1311
1312        cancel_delayed_work_sync(&chip->prox_work);
1313
1314        if (!pm_runtime_suspended(&client->dev))
1315                bh1770_chip_off(chip);
1316
1317        pm_runtime_disable(&client->dev);
1318        pm_runtime_set_suspended(&client->dev);
1319
1320        return 0;
1321}
1322
1323#ifdef CONFIG_PM_SLEEP
1324static int bh1770_suspend(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
1329        bh1770_chip_off(chip);
1330
1331        return 0;
1332}
1333
1334static int bh1770_resume(struct device *dev)
1335{
1336        struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1337        struct bh1770_chip *chip = i2c_get_clientdata(client);
1338        int ret = 0;
1339
1340        bh1770_chip_on(chip);
1341
1342        if (!pm_runtime_suspended(dev)) {
1343                /*
1344                 * If we were enabled at suspend time, it is expected
1345                 * everything works nice and smoothly
1346                 */
1347                ret = bh1770_lux_rate(chip, chip->lux_rate_index);
1348                ret |= bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
1349
1350                /* This causes interrupt after the next measurement cycle */
1351                bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
1352                                        BH1770_LUX_DEF_THRES);
1353                /* Inform that we are waiting for a result from ALS */
1354                chip->lux_wait_result = true;
1355                bh1770_prox_mode_control(chip);
1356        }
1357        return ret;
1358}
1359#endif
1360
1361#ifdef CONFIG_PM
1362static int bh1770_runtime_suspend(struct device *dev)
1363{
1364        struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1365        struct bh1770_chip *chip = i2c_get_clientdata(client);
1366
1367        bh1770_chip_off(chip);
1368
1369        return 0;
1370}
1371
1372static int bh1770_runtime_resume(struct device *dev)
1373{
1374        struct i2c_client *client = container_of(dev, struct i2c_client, dev);
1375        struct bh1770_chip *chip = i2c_get_clientdata(client);
1376
1377        bh1770_chip_on(chip);
1378
1379        return 0;
1380}
1381#endif
1382
1383static const struct i2c_device_id bh1770_id[] = {
1384        {"bh1770glc", 0 },
1385        {"sfh7770", 0 },
1386        {}
1387};
1388
1389MODULE_DEVICE_TABLE(i2c, bh1770_id);
1390
1391static const struct dev_pm_ops bh1770_pm_ops = {
1392        SET_SYSTEM_SLEEP_PM_OPS(bh1770_suspend, bh1770_resume)
1393        SET_RUNTIME_PM_OPS(bh1770_runtime_suspend, bh1770_runtime_resume, NULL)
1394};
1395
1396static struct i2c_driver bh1770_driver = {
1397        .driver  = {
1398                .name   = "bh1770glc",
1399                .pm     = &bh1770_pm_ops,
1400        },
1401        .probe    = bh1770_probe,
1402        .remove   = bh1770_remove,
1403        .id_table = bh1770_id,
1404};
1405
1406module_i2c_driver(bh1770_driver);
1407
1408MODULE_DESCRIPTION("BH1770GLC / SFH7770 combined ALS and proximity sensor");
1409MODULE_AUTHOR("Samu Onkalo, Nokia Corporation");
1410MODULE_LICENSE("GPL v2");
1411