drivers/iio/light/isl29028.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * IIO driver for the light sensor ISL29028.
   4  * ISL29028 is Concurrent Ambient Light and Proximity Sensor
   5  *
   6  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   7  * Copyright (c) 2016-2017 Brian Masney <masneyb@onstation.org>
   8  *
   9  * Datasheets:
  10  *  - http://www.intersil.com/content/dam/Intersil/documents/isl2/isl29028.pdf
  11  *  - http://www.intersil.com/content/dam/Intersil/documents/isl2/isl29030.pdf
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/i2c.h>
  16 #include <linux/err.h>
  17 #include <linux/mutex.h>
  18 #include <linux/delay.h>
  19 #include <linux/slab.h>
  20 #include <linux/regmap.h>
  21 #include <linux/iio/iio.h>
  22 #include <linux/iio/sysfs.h>
  23 #include <linux/pm_runtime.h>
  24
  25 #define ISL29028_CONV_TIME_MS                   100
  26
  27 #define ISL29028_REG_CONFIGURE                  0x01
  28
  29 #define ISL29028_CONF_ALS_IR_MODE_ALS           0
  30 #define ISL29028_CONF_ALS_IR_MODE_IR            BIT(0)
  31 #define ISL29028_CONF_ALS_IR_MODE_MASK          BIT(0)
  32
  33 #define ISL29028_CONF_ALS_RANGE_LOW_LUX         0
  34 #define ISL29028_CONF_ALS_RANGE_HIGH_LUX        BIT(1)
  35 #define ISL29028_CONF_ALS_RANGE_MASK            BIT(1)
  36
  37 #define ISL29028_CONF_ALS_DIS                   0
  38 #define ISL29028_CONF_ALS_EN                    BIT(2)
  39 #define ISL29028_CONF_ALS_EN_MASK               BIT(2)
  40
  41 #define ISL29028_CONF_PROX_SLP_SH               4
  42 #define ISL29028_CONF_PROX_SLP_MASK             (7 << ISL29028_CONF_PROX_SLP_SH)
  43
  44 #define ISL29028_CONF_PROX_EN                   BIT(7)
  45 #define ISL29028_CONF_PROX_EN_MASK              BIT(7)
  46
  47 #define ISL29028_REG_INTERRUPT                  0x02
  48
  49 #define ISL29028_REG_PROX_DATA                  0x08
  50 #define ISL29028_REG_ALSIR_L                    0x09
  51 #define ISL29028_REG_ALSIR_U                    0x0A
  52
  53 #define ISL29028_REG_TEST1_MODE                 0x0E
  54 #define ISL29028_REG_TEST2_MODE                 0x0F
  55
  56 #define ISL29028_NUM_REGS                       (ISL29028_REG_TEST2_MODE + 1)
  57
  58 #define ISL29028_POWER_OFF_DELAY_MS             2000
  59
  60 struct isl29028_prox_data {
  61         int sampling_int;
  62         int sampling_fract;
  63         int sleep_time;
  64 };
  65
  66 static const struct isl29028_prox_data isl29028_prox_data[] = {
  67         {   1, 250000, 800 },
  68         {   2, 500000, 400 },
  69         {   5,      0, 200 },
  70         {  10,      0, 100 },
  71         {  13, 300000,  75 },
  72         {  20,      0,  50 },
  73         {  80,      0,  13 }, /*
  74                                * Note: Data sheet lists 12.5 ms sleep time.
  75                                * Round up a half millisecond for msleep().
  76                                */
  77         { 100,  0,   0 }
  78 };
  79
  80 enum isl29028_als_ir_mode {
  81         ISL29028_MODE_NONE = 0,
  82         ISL29028_MODE_ALS,
  83         ISL29028_MODE_IR,
  84 };
  85
  86 struct isl29028_chip {
  87         struct mutex                    lock;
  88         struct regmap                   *regmap;
  89         int                             prox_sampling_int;
  90         int                             prox_sampling_frac;
  91         bool                            enable_prox;
  92         int                             lux_scale;
  93         enum isl29028_als_ir_mode       als_ir_mode;
  94 };
  95
  96 static int isl29028_find_prox_sleep_index(int sampling_int, int sampling_fract)
  97 {
  98         int i;
  99
 100         for (i = 0; i < ARRAY_SIZE(isl29028_prox_data); ++i) {
 101                 if (isl29028_prox_data[i].sampling_int == sampling_int &&
 102                     isl29028_prox_data[i].sampling_fract == sampling_fract)
 103                         return i;
 104         }
 105
 106         return -EINVAL;
 107 }
 108
 109 static int isl29028_set_proxim_sampling(struct isl29028_chip *chip,
 110                                         int sampling_int, int sampling_fract)
 111 {
 112         struct device *dev = regmap_get_device(chip->regmap);
 113         int sleep_index, ret;
 114
 115         sleep_index = isl29028_find_prox_sleep_index(sampling_int,
 116                                                      sampling_fract);
 117         if (sleep_index < 0)
 118                 return sleep_index;
 119
 120         ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
 121                                  ISL29028_CONF_PROX_SLP_MASK,
 122                                  sleep_index << ISL29028_CONF_PROX_SLP_SH);
 123
 124         if (ret < 0) {
 125                 dev_err(dev, "%s(): Error %d setting the proximity sampling\n",
 126                         __func__, ret);
 127                 return ret;
 128         }
 129
 130         chip->prox_sampling_int = sampling_int;
 131         chip->prox_sampling_frac = sampling_fract;
 132
 133         return ret;
 134 }
 135
 136 static int isl29028_enable_proximity(struct isl29028_chip *chip)
 137 {
 138         int prox_index, ret;
 139
 140         ret = isl29028_set_proxim_sampling(chip, chip->prox_sampling_int,
 141                                            chip->prox_sampling_frac);
 142         if (ret < 0)
 143                 return ret;
 144
 145         ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
 146                                  ISL29028_CONF_PROX_EN_MASK,
 147                                  ISL29028_CONF_PROX_EN);
 148         if (ret < 0)
 149                 return ret;
 150
 151         /* Wait for conversion to be complete for first sample */
 152         prox_index = isl29028_find_prox_sleep_index(chip->prox_sampling_int,
 153                                                     chip->prox_sampling_frac);
 154         if (prox_index < 0)
 155                 return prox_index;
 156
 157         msleep(isl29028_prox_data[prox_index].sleep_time);
 158
 159         return 0;
 160 }
 161
 162 static int isl29028_set_als_scale(struct isl29028_chip *chip, int lux_scale)
 163 {
 164         struct device *dev = regmap_get_device(chip->regmap);
 165         int val = (lux_scale == 2000) ? ISL29028_CONF_ALS_RANGE_HIGH_LUX :
 166                                         ISL29028_CONF_ALS_RANGE_LOW_LUX;
 167         int ret;
 168
 169         ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
 170                                  ISL29028_CONF_ALS_RANGE_MASK, val);
 171         if (ret < 0) {
 172                 dev_err(dev, "%s(): Error %d setting the ALS scale\n", __func__,
 173                         ret);
 174                 return ret;
 175         }
 176
 177         chip->lux_scale = lux_scale;
 178
 179         return ret;
 180 }
 181
 182 static int isl29028_set_als_ir_mode(struct isl29028_chip *chip,
 183                                     enum isl29028_als_ir_mode mode)
 184 {
 185         int ret;
 186
 187         if (chip->als_ir_mode == mode)
 188                 return 0;
 189
 190         ret = isl29028_set_als_scale(chip, chip->lux_scale);
 191         if (ret < 0)
 192                 return ret;
 193
 194         switch (mode) {
 195         case ISL29028_MODE_ALS:
 196                 ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
 197                                          ISL29028_CONF_ALS_IR_MODE_MASK,
 198                                          ISL29028_CONF_ALS_IR_MODE_ALS);
 199                 if (ret < 0)
 200                         return ret;
 201
 202                 ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
 203                                          ISL29028_CONF_ALS_RANGE_MASK,
 204                                          ISL29028_CONF_ALS_RANGE_HIGH_LUX);
 205                 break;
 206         case ISL29028_MODE_IR:
 207                 ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
 208                                          ISL29028_CONF_ALS_IR_MODE_MASK,
 209                                          ISL29028_CONF_ALS_IR_MODE_IR);
 210                 break;
 211         case ISL29028_MODE_NONE:
 212                 return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
 213                                           ISL29028_CONF_ALS_EN_MASK,
 214                                           ISL29028_CONF_ALS_DIS);
 215         }
 216
 217         if (ret < 0)
 218                 return ret;
 219
 220         /* Enable the ALS/IR */
 221         ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
 222                                  ISL29028_CONF_ALS_EN_MASK,
 223                                  ISL29028_CONF_ALS_EN);
 224         if (ret < 0)
 225                 return ret;
 226
 227         /* Need to wait for conversion time if ALS/IR mode enabled */
 228         msleep(ISL29028_CONV_TIME_MS);
 229
 230         chip->als_ir_mode = mode;
 231
 232         return 0;
 233 }
 234
 235 static int isl29028_read_als_ir(struct isl29028_chip *chip, int *als_ir)
 236 {
 237         struct device *dev = regmap_get_device(chip->regmap);
 238         unsigned int lsb;
 239         unsigned int msb;
 240         int ret;
 241
 242         ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_L, &lsb);
 243         if (ret < 0) {
 244                 dev_err(dev,
 245                         "%s(): Error %d reading register ALSIR_L\n",
 246                         __func__, ret);
 247                 return ret;
 248         }
 249
 250         ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_U, &msb);
 251         if (ret < 0) {
 252                 dev_err(dev,
 253                         "%s(): Error %d reading register ALSIR_U\n",
 254                         __func__, ret);
 255                 return ret;
 256         }
 257
 258         *als_ir = ((msb & 0xF) << 8) | (lsb & 0xFF);
 259
 260         return 0;
 261 }
 262
 263 static int isl29028_read_proxim(struct isl29028_chip *chip, int *prox)
 264 {
 265         struct device *dev = regmap_get_device(chip->regmap);
 266         unsigned int data;
 267         int ret;
 268
 269         if (!chip->enable_prox) {
 270                 ret = isl29028_enable_proximity(chip);
 271                 if (ret < 0)
 272                         return ret;
 273
 274                 chip->enable_prox = true;
 275         }
 276
 277         ret = regmap_read(chip->regmap, ISL29028_REG_PROX_DATA, &data);
 278         if (ret < 0) {
 279                 dev_err(dev, "%s(): Error %d reading register PROX_DATA\n",
 280                         __func__, ret);
 281                 return ret;
 282         }
 283
 284         *prox = data;
 285
 286         return 0;
 287 }
 288
 289 static int isl29028_als_get(struct isl29028_chip *chip, int *als_data)
 290 {
 291         struct device *dev = regmap_get_device(chip->regmap);
 292         int ret;
 293         int als_ir_data;
 294
 295         ret = isl29028_set_als_ir_mode(chip, ISL29028_MODE_ALS);
 296         if (ret < 0) {
 297                 dev_err(dev, "%s(): Error %d enabling ALS mode\n", __func__,
 298                         ret);
 299                 return ret;
 300         }
 301
 302         ret = isl29028_read_als_ir(chip, &als_ir_data);
 303         if (ret < 0)
 304                 return ret;
 305
 306         /*
 307          * convert als data count to lux.
 308          * if lux_scale = 125,  lux = count * 0.031
 309          * if lux_scale = 2000, lux = count * 0.49
 310          */
 311         if (chip->lux_scale == 125)
 312                 als_ir_data = (als_ir_data * 31) / 1000;
 313         else
 314                 als_ir_data = (als_ir_data * 49) / 100;
 315
 316         *als_data = als_ir_data;
 317
 318         return 0;
 319 }
 320
 321 static int isl29028_ir_get(struct isl29028_chip *chip, int *ir_data)
 322 {
 323         struct device *dev = regmap_get_device(chip->regmap);
 324         int ret;
 325
 326         ret = isl29028_set_als_ir_mode(chip, ISL29028_MODE_IR);
 327         if (ret < 0) {
 328                 dev_err(dev, "%s(): Error %d enabling IR mode\n", __func__,
 329                         ret);
 330                 return ret;
 331         }
 332
 333         return isl29028_read_als_ir(chip, ir_data);
 334 }
 335
 336 static int isl29028_set_pm_runtime_busy(struct isl29028_chip *chip, bool on)
 337 {
 338         struct device *dev = regmap_get_device(chip->regmap);
 339         int ret;
 340
 341         if (on) {
 342                 ret = pm_runtime_get_sync(dev);
 343                 if (ret < 0)
 344                         pm_runtime_put_noidle(dev);
 345         } else {
 346                 pm_runtime_mark_last_busy(dev);
 347                 ret = pm_runtime_put_autosuspend(dev);
 348         }
 349
 350         return ret;
 351 }
 352
 353 /* Channel IO */
 354 static int isl29028_write_raw(struct iio_dev *indio_dev,
 355                               struct iio_chan_spec const *chan,
 356                               int val, int val2, long mask)
 357 {
 358         struct isl29028_chip *chip = iio_priv(indio_dev);
 359         struct device *dev = regmap_get_device(chip->regmap);
 360         int ret;
 361
 362         ret = isl29028_set_pm_runtime_busy(chip, true);
 363         if (ret < 0)
 364                 return ret;
 365
 366         mutex_lock(&chip->lock);
 367
 368         ret = -EINVAL;
 369         switch (chan->type) {
 370         case IIO_PROXIMITY:
 371                 if (mask != IIO_CHAN_INFO_SAMP_FREQ) {
 372                         dev_err(dev,
 373                                 "%s(): proximity: Mask value 0x%08lx is not supported\n",
 374                                 __func__, mask);
 375                         break;
 376                 }
 377
 378                 if (val < 1 || val > 100) {
 379                         dev_err(dev,
 380                                 "%s(): proximity: Sampling frequency %d is not in the range [1:100]\n",
 381                                 __func__, val);
 382                         break;
 383                 }
 384
 385                 ret = isl29028_set_proxim_sampling(chip, val, val2);
 386                 break;
 387         case IIO_LIGHT:
 388                 if (mask != IIO_CHAN_INFO_SCALE) {
 389                         dev_err(dev,
 390                                 "%s(): light: Mask value 0x%08lx is not supported\n",
 391                                 __func__, mask);
 392                         break;
 393                 }
 394
 395                 if (val != 125 && val != 2000) {
 396                         dev_err(dev,
 397                                 "%s(): light: Lux scale %d is not in the set {125, 2000}\n",
 398                                 __func__, val);
 399                         break;
 400                 }
 401
 402                 ret = isl29028_set_als_scale(chip, val);
 403                 break;
 404         default:
 405                 dev_err(dev, "%s(): Unsupported channel type %x\n",
 406                         __func__, chan->type);
 407                 break;
 408         }
 409
 410         mutex_unlock(&chip->lock);
 411
 412         if (ret < 0)
 413                 return ret;
 414
 415         ret = isl29028_set_pm_runtime_busy(chip, false);
 416         if (ret < 0)
 417                 return ret;
 418
 419         return ret;
 420 }
 421
 422 static int isl29028_read_raw(struct iio_dev *indio_dev,
 423                              struct iio_chan_spec const *chan,
 424                              int *val, int *val2, long mask)
 425 {
 426         struct isl29028_chip *chip = iio_priv(indio_dev);
 427         struct device *dev = regmap_get_device(chip->regmap);
 428         int ret, pm_ret;
 429
 430         ret = isl29028_set_pm_runtime_busy(chip, true);
 431         if (ret < 0)
 432                 return ret;
 433
 434         mutex_lock(&chip->lock);
 435
 436         ret = -EINVAL;
 437         switch (mask) {
 438         case IIO_CHAN_INFO_RAW:
 439         case IIO_CHAN_INFO_PROCESSED:
 440                 switch (chan->type) {
 441                 case IIO_LIGHT:
 442                         ret = isl29028_als_get(chip, val);
 443                         break;
 444                 case IIO_INTENSITY:
 445                         ret = isl29028_ir_get(chip, val);
 446                         break;
 447                 case IIO_PROXIMITY:
 448                         ret = isl29028_read_proxim(chip, val);
 449                         break;
 450                 default:
 451                         break;
 452                 }
 453
 454                 if (ret < 0)
 455                         break;
 456
 457                 ret = IIO_VAL_INT;
 458                 break;
 459         case IIO_CHAN_INFO_SAMP_FREQ:
 460                 if (chan->type != IIO_PROXIMITY)
 461                         break;
 462
 463                 *val = chip->prox_sampling_int;
 464                 *val2 = chip->prox_sampling_frac;
 465                 ret = IIO_VAL_INT;
 466                 break;
 467         case IIO_CHAN_INFO_SCALE:
 468                 if (chan->type != IIO_LIGHT)
 469                         break;
 470                 *val = chip->lux_scale;
 471                 ret = IIO_VAL_INT;
 472                 break;
 473         default:
 474                 dev_err(dev, "%s(): mask value 0x%08lx is not supported\n",
 475                         __func__, mask);
 476                 break;
 477         }
 478
 479         mutex_unlock(&chip->lock);
 480
 481         if (ret < 0)
 482                 return ret;
 483
 484         /**
 485          * Preserve the ret variable if the call to
 486          * isl29028_set_pm_runtime_busy() is successful so the reading
 487          * (if applicable) is returned to user space.
 488          */
 489         pm_ret = isl29028_set_pm_runtime_busy(chip, false);
 490         if (pm_ret < 0)
 491                 return pm_ret;
 492
 493         return ret;
 494 }
 495
 496 static IIO_CONST_ATTR(in_proximity_sampling_frequency_available,
 497                                 "1.25 2.5 5 10 13.3 20 80 100");
 498 static IIO_CONST_ATTR(in_illuminance_scale_available, "125 2000");
 499
 500 #define ISL29028_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr)
 501 static struct attribute *isl29028_attributes[] = {
 502         ISL29028_CONST_ATTR(in_proximity_sampling_frequency_available),
 503         ISL29028_CONST_ATTR(in_illuminance_scale_available),
 504         NULL,
 505 };
 506
 507 static const struct attribute_group isl29108_group = {
 508         .attrs = isl29028_attributes,
 509 };
 510
 511 static const struct iio_chan_spec isl29028_channels[] = {
 512         {
 513                 .type = IIO_LIGHT,
 514                 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
 515                 BIT(IIO_CHAN_INFO_SCALE),
 516         }, {
 517                 .type = IIO_INTENSITY,
 518                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 519         }, {
 520                 .type = IIO_PROXIMITY,
 521                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 522                 BIT(IIO_CHAN_INFO_SAMP_FREQ),
 523         }
 524 };
 525
 526 static const struct iio_info isl29028_info = {
 527         .attrs = &isl29108_group,
 528         .read_raw = isl29028_read_raw,
 529         .write_raw = isl29028_write_raw,
 530 };
 531
 532 static int isl29028_clear_configure_reg(struct isl29028_chip *chip)
 533 {
 534         struct device *dev = regmap_get_device(chip->regmap);
 535         int ret;
 536
 537         ret = regmap_write(chip->regmap, ISL29028_REG_CONFIGURE, 0x0);
 538         if (ret < 0)
 539                 dev_err(dev, "%s(): Error %d clearing the CONFIGURE register\n",
 540                         __func__, ret);
 541
 542         chip->als_ir_mode = ISL29028_MODE_NONE;
 543         chip->enable_prox = false;
 544
 545         return ret;
 546 }
 547
 548 static bool isl29028_is_volatile_reg(struct device *dev, unsigned int reg)
 549 {
 550         switch (reg) {
 551         case ISL29028_REG_INTERRUPT:
 552         case ISL29028_REG_PROX_DATA:
 553         case ISL29028_REG_ALSIR_L:
 554         case ISL29028_REG_ALSIR_U:
 555                 return true;
 556         default:
 557                 return false;
 558         }
 559 }
 560
 561 static const struct regmap_config isl29028_regmap_config = {
 562         .reg_bits = 8,
 563         .val_bits = 8,
 564         .volatile_reg = isl29028_is_volatile_reg,
 565         .max_register = ISL29028_NUM_REGS - 1,
 566         .num_reg_defaults_raw = ISL29028_NUM_REGS,
 567         .cache_type = REGCACHE_RBTREE,
 568 };
 569
 570 static int isl29028_probe(struct i2c_client *client,
 571                           const struct i2c_device_id *id)
 572 {
 573         struct isl29028_chip *chip;
 574         struct iio_dev *indio_dev;
 575         int ret;
 576
 577         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
 578         if (!indio_dev)
 579                 return -ENOMEM;
 580
 581         chip = iio_priv(indio_dev);
 582
 583         i2c_set_clientdata(client, indio_dev);
 584         mutex_init(&chip->lock);
 585
 586         chip->regmap = devm_regmap_init_i2c(client, &isl29028_regmap_config);
 587         if (IS_ERR(chip->regmap)) {
 588                 ret = PTR_ERR(chip->regmap);
 589                 dev_err(&client->dev, "%s: Error %d initializing regmap\n",
 590                         __func__, ret);
 591                 return ret;
 592         }
 593
 594         chip->enable_prox  = false;
 595         chip->prox_sampling_int = 20;
 596         chip->prox_sampling_frac = 0;
 597         chip->lux_scale = 2000;
 598
 599         ret = regmap_write(chip->regmap, ISL29028_REG_TEST1_MODE, 0x0);
 600         if (ret < 0) {
 601                 dev_err(&client->dev,
 602                         "%s(): Error %d writing to TEST1_MODE register\n",
 603                         __func__, ret);
 604                 return ret;
 605         }
 606
 607         ret = regmap_write(chip->regmap, ISL29028_REG_TEST2_MODE, 0x0);
 608         if (ret < 0) {
 609                 dev_err(&client->dev,
 610                         "%s(): Error %d writing to TEST2_MODE register\n",
 611                         __func__, ret);
 612                 return ret;
 613         }
 614
 615         ret = isl29028_clear_configure_reg(chip);
 616         if (ret < 0)
 617                 return ret;
 618
 619         indio_dev->info = &isl29028_info;
 620         indio_dev->channels = isl29028_channels;
 621         indio_dev->num_channels = ARRAY_SIZE(isl29028_channels);
 622         indio_dev->name = id->name;
 623         indio_dev->modes = INDIO_DIRECT_MODE;
 624
 625         pm_runtime_enable(&client->dev);
 626         pm_runtime_set_autosuspend_delay(&client->dev,
 627                                          ISL29028_POWER_OFF_DELAY_MS);
 628         pm_runtime_use_autosuspend(&client->dev);
 629
 630         ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
 631         if (ret < 0) {
 632                 dev_err(&client->dev,
 633                         "%s(): iio registration failed with error %d\n",
 634                         __func__, ret);
 635                 return ret;
 636         }
 637
 638         return 0;
 639 }
 640
 641 static int isl29028_remove(struct i2c_client *client)
 642 {
 643         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 644         struct isl29028_chip *chip = iio_priv(indio_dev);
 645
 646         iio_device_unregister(indio_dev);
 647
 648         pm_runtime_disable(&client->dev);
 649         pm_runtime_set_suspended(&client->dev);
 650         pm_runtime_put_noidle(&client->dev);
 651
 652         return isl29028_clear_configure_reg(chip);
 653 }
 654
 655 static int __maybe_unused isl29028_suspend(struct device *dev)
 656 {
 657         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 658         struct isl29028_chip *chip = iio_priv(indio_dev);
 659         int ret;
 660
 661         mutex_lock(&chip->lock);
 662
 663         ret = isl29028_clear_configure_reg(chip);
 664
 665         mutex_unlock(&chip->lock);
 666
 667         return ret;
 668 }
 669
 670 static int __maybe_unused isl29028_resume(struct device *dev)
 671 {
 672         /**
 673          * The specific component (ALS/IR or proximity) will enable itself as
 674          * needed the next time that the user requests a reading. This is done
 675          * above in isl29028_set_als_ir_mode() and isl29028_enable_proximity().
 676          */
 677         return 0;
 678 }
 679
 680 static const struct dev_pm_ops isl29028_pm_ops = {
 681         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 682                                 pm_runtime_force_resume)
 683         SET_RUNTIME_PM_OPS(isl29028_suspend, isl29028_resume, NULL)
 684 };
 685
 686 static const struct i2c_device_id isl29028_id[] = {
 687         {"isl29028", 0},
 688         {"isl29030", 0},
 689         {}
 690 };
 691 MODULE_DEVICE_TABLE(i2c, isl29028_id);
 692
 693 static const struct of_device_id isl29028_of_match[] = {
 694         { .compatible = "isl,isl29028", }, /* for backward compat., don't use */
 695         { .compatible = "isil,isl29028", },
 696         { .compatible = "isil,isl29030", },
 697         { },
 698 };
 699 MODULE_DEVICE_TABLE(of, isl29028_of_match);
 700
 701 static struct i2c_driver isl29028_driver = {
 702         .driver  = {
 703                 .name = "isl29028",
 704                 .pm = &isl29028_pm_ops,
 705                 .of_match_table = isl29028_of_match,
 706         },
 707         .probe   = isl29028_probe,
 708         .remove  = isl29028_remove,
 709         .id_table = isl29028_id,
 710 };
 711
 712 module_i2c_driver(isl29028_driver);
 713
 714 MODULE_DESCRIPTION("ISL29028 Ambient Light and Proximity Sensor driver");
 715 MODULE_LICENSE("GPL v2");
 716 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");