drivers/iio/light/stk3310.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Sensortek STK3310/STK3311 Ambient Light and Proximity Sensor
   4  *
   5  * Copyright (c) 2015, Intel Corporation.
   6  *
   7  * IIO driver for STK3310/STK3311. 7-bit I2C address: 0x48.
   8  */
   9
  10 #include <linux/acpi.h>
  11 #include <linux/i2c.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/regmap.h>
  16 #include <linux/iio/events.h>
  17 #include <linux/iio/iio.h>
  18 #include <linux/iio/sysfs.h>
  19
  20 #define STK3310_REG_STATE                       0x00
  21 #define STK3310_REG_PSCTRL                      0x01
  22 #define STK3310_REG_ALSCTRL                     0x02
  23 #define STK3310_REG_INT                         0x04
  24 #define STK3310_REG_THDH_PS                     0x06
  25 #define STK3310_REG_THDL_PS                     0x08
  26 #define STK3310_REG_FLAG                        0x10
  27 #define STK3310_REG_PS_DATA_MSB                 0x11
  28 #define STK3310_REG_PS_DATA_LSB                 0x12
  29 #define STK3310_REG_ALS_DATA_MSB                0x13
  30 #define STK3310_REG_ALS_DATA_LSB                0x14
  31 #define STK3310_REG_ID                          0x3E
  32 #define STK3310_MAX_REG                         0x80
  33
  34 #define STK3310_STATE_EN_PS                     BIT(0)
  35 #define STK3310_STATE_EN_ALS                    BIT(1)
  36 #define STK3310_STATE_STANDBY                   0x00
  37
  38 #define STK3310_CHIP_ID_VAL                     0x13
  39 #define STK3311_CHIP_ID_VAL                     0x1D
  40 #define STK3311X_CHIP_ID_VAL                    0x12
  41 #define STK3335_CHIP_ID_VAL                     0x51
  42 #define STK3310_PSINT_EN                        0x01
  43 #define STK3310_PS_MAX_VAL                      0xFFFF
  44
  45 #define STK3310_DRIVER_NAME                     "stk3310"
  46 #define STK3310_REGMAP_NAME                     "stk3310_regmap"
  47 #define STK3310_EVENT                           "stk3310_event"
  48
  49 #define STK3310_SCALE_AVAILABLE                 "6.4 1.6 0.4 0.1"
  50
  51 #define STK3310_IT_AVAILABLE \
  52         "0.000185 0.000370 0.000741 0.001480 0.002960 0.005920 0.011840 " \
  53         "0.023680 0.047360 0.094720 0.189440 0.378880 0.757760 1.515520 " \
  54         "3.031040 6.062080"
  55
  56 #define STK3310_REGFIELD(name)                                              \
  57         do {                                                                \
  58                 data->reg_##name =                                          \
  59                         devm_regmap_field_alloc(&client->dev, regmap,       \
  60                                 stk3310_reg_field_##name);                  \
  61                 if (IS_ERR(data->reg_##name)) {                             \
  62                         dev_err(&client->dev, "reg field alloc failed.\n"); \
  63                         return PTR_ERR(data->reg_##name);                   \
  64                 }                                                           \
  65         } while (0)
  66
  67 static const struct reg_field stk3310_reg_field_state =
  68                                 REG_FIELD(STK3310_REG_STATE, 0, 2);
  69 static const struct reg_field stk3310_reg_field_als_gain =
  70                                 REG_FIELD(STK3310_REG_ALSCTRL, 4, 5);
  71 static const struct reg_field stk3310_reg_field_ps_gain =
  72                                 REG_FIELD(STK3310_REG_PSCTRL, 4, 5);
  73 static const struct reg_field stk3310_reg_field_als_it =
  74                                 REG_FIELD(STK3310_REG_ALSCTRL, 0, 3);
  75 static const struct reg_field stk3310_reg_field_ps_it =
  76                                 REG_FIELD(STK3310_REG_PSCTRL, 0, 3);
  77 static const struct reg_field stk3310_reg_field_int_ps =
  78                                 REG_FIELD(STK3310_REG_INT, 0, 2);
  79 static const struct reg_field stk3310_reg_field_flag_psint =
  80                                 REG_FIELD(STK3310_REG_FLAG, 4, 4);
  81 static const struct reg_field stk3310_reg_field_flag_nf =
  82                                 REG_FIELD(STK3310_REG_FLAG, 0, 0);
  83
  84 /* Estimate maximum proximity values with regard to measurement scale. */
  85 static const int stk3310_ps_max[4] = {
  86         STK3310_PS_MAX_VAL / 640,
  87         STK3310_PS_MAX_VAL / 160,
  88         STK3310_PS_MAX_VAL /  40,
  89         STK3310_PS_MAX_VAL /  10
  90 };
  91
  92 static const int stk3310_scale_table[][2] = {
  93         {6, 400000}, {1, 600000}, {0, 400000}, {0, 100000}
  94 };
  95
  96 /* Integration time in seconds, microseconds */
  97 static const int stk3310_it_table[][2] = {
  98         {0, 185},       {0, 370},       {0, 741},       {0, 1480},
  99         {0, 2960},      {0, 5920},      {0, 11840},     {0, 23680},
 100         {0, 47360},     {0, 94720},     {0, 189440},    {0, 378880},
 101         {0, 757760},    {1, 515520},    {3, 31040},     {6, 62080},
 102 };
 103
 104 struct stk3310_data {
 105         struct i2c_client *client;
 106         struct mutex lock;
 107         bool als_enabled;
 108         bool ps_enabled;
 109         u64 timestamp;
 110         struct regmap *regmap;
 111         struct regmap_field *reg_state;
 112         struct regmap_field *reg_als_gain;
 113         struct regmap_field *reg_ps_gain;
 114         struct regmap_field *reg_als_it;
 115         struct regmap_field *reg_ps_it;
 116         struct regmap_field *reg_int_ps;
 117         struct regmap_field *reg_flag_psint;
 118         struct regmap_field *reg_flag_nf;
 119 };
 120
 121 static const struct iio_event_spec stk3310_events[] = {
 122         /* Proximity event */
 123         {
 124                 .type = IIO_EV_TYPE_THRESH,
 125                 .dir = IIO_EV_DIR_RISING,
 126                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 127                                  BIT(IIO_EV_INFO_ENABLE),
 128         },
 129         /* Out-of-proximity event */
 130         {
 131                 .type = IIO_EV_TYPE_THRESH,
 132                 .dir = IIO_EV_DIR_FALLING,
 133                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 134                                  BIT(IIO_EV_INFO_ENABLE),
 135         },
 136 };
 137
 138 static const struct iio_chan_spec stk3310_channels[] = {
 139         {
 140                 .type = IIO_LIGHT,
 141                 .info_mask_separate =
 142                         BIT(IIO_CHAN_INFO_RAW) |
 143                         BIT(IIO_CHAN_INFO_SCALE) |
 144                         BIT(IIO_CHAN_INFO_INT_TIME),
 145         },
 146         {
 147                 .type = IIO_PROXIMITY,
 148                 .info_mask_separate =
 149                         BIT(IIO_CHAN_INFO_RAW) |
 150                         BIT(IIO_CHAN_INFO_SCALE) |
 151                         BIT(IIO_CHAN_INFO_INT_TIME),
 152                 .event_spec = stk3310_events,
 153                 .num_event_specs = ARRAY_SIZE(stk3310_events),
 154         }
 155 };
 156
 157 static IIO_CONST_ATTR(in_illuminance_scale_available, STK3310_SCALE_AVAILABLE);
 158
 159 static IIO_CONST_ATTR(in_proximity_scale_available, STK3310_SCALE_AVAILABLE);
 160
 161 static IIO_CONST_ATTR(in_illuminance_integration_time_available,
 162                       STK3310_IT_AVAILABLE);
 163
 164 static IIO_CONST_ATTR(in_proximity_integration_time_available,
 165                       STK3310_IT_AVAILABLE);
 166
 167 static struct attribute *stk3310_attributes[] = {
 168         &iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
 169         &iio_const_attr_in_proximity_scale_available.dev_attr.attr,
 170         &iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
 171         &iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
 172         NULL,
 173 };
 174
 175 static const struct attribute_group stk3310_attribute_group = {
 176         .attrs = stk3310_attributes
 177 };
 178
 179 static int stk3310_get_index(const int table[][2], int table_size,
 180                              int val, int val2)
 181 {
 182         int i;
 183
 184         for (i = 0; i < table_size; i++) {
 185                 if (val == table[i][0] && val2 == table[i][1])
 186                         return i;
 187         }
 188
 189         return -EINVAL;
 190 }
 191
 192 static int stk3310_read_event(struct iio_dev *indio_dev,
 193                               const struct iio_chan_spec *chan,
 194                               enum iio_event_type type,
 195                               enum iio_event_direction dir,
 196                               enum iio_event_info info,
 197                               int *val, int *val2)
 198 {
 199         u8 reg;
 200         __be16 buf;
 201         int ret;
 202         struct stk3310_data *data = iio_priv(indio_dev);
 203
 204         if (info != IIO_EV_INFO_VALUE)
 205                 return -EINVAL;
 206
 207         /* Only proximity interrupts are implemented at the moment. */
 208         if (dir == IIO_EV_DIR_RISING)
 209                 reg = STK3310_REG_THDH_PS;
 210         else if (dir == IIO_EV_DIR_FALLING)
 211                 reg = STK3310_REG_THDL_PS;
 212         else
 213                 return -EINVAL;
 214
 215         mutex_lock(&data->lock);
 216         ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
 217         mutex_unlock(&data->lock);
 218         if (ret < 0) {
 219                 dev_err(&data->client->dev, "register read failed\n");
 220                 return ret;
 221         }
 222         *val = be16_to_cpu(buf);
 223
 224         return IIO_VAL_INT;
 225 }
 226
 227 static int stk3310_write_event(struct iio_dev *indio_dev,
 228                                const struct iio_chan_spec *chan,
 229                                enum iio_event_type type,
 230                                enum iio_event_direction dir,
 231                                enum iio_event_info info,
 232                                int val, int val2)
 233 {
 234         u8 reg;
 235         __be16 buf;
 236         int ret;
 237         unsigned int index;
 238         struct stk3310_data *data = iio_priv(indio_dev);
 239         struct i2c_client *client = data->client;
 240
 241         ret = regmap_field_read(data->reg_ps_gain, &index);
 242         if (ret < 0)
 243                 return ret;
 244
 245         if (val < 0 || val > stk3310_ps_max[index])
 246                 return -EINVAL;
 247
 248         if (dir == IIO_EV_DIR_RISING)
 249                 reg = STK3310_REG_THDH_PS;
 250         else if (dir == IIO_EV_DIR_FALLING)
 251                 reg = STK3310_REG_THDL_PS;
 252         else
 253                 return -EINVAL;
 254
 255         buf = cpu_to_be16(val);
 256         ret = regmap_bulk_write(data->regmap, reg, &buf, 2);
 257         if (ret < 0)
 258                 dev_err(&client->dev, "failed to set PS threshold!\n");
 259
 260         return ret;
 261 }
 262
 263 static int stk3310_read_event_config(struct iio_dev *indio_dev,
 264                                      const struct iio_chan_spec *chan,
 265                                      enum iio_event_type type,
 266                                      enum iio_event_direction dir)
 267 {
 268         unsigned int event_val;
 269         int ret;
 270         struct stk3310_data *data = iio_priv(indio_dev);
 271
 272         ret = regmap_field_read(data->reg_int_ps, &event_val);
 273         if (ret < 0)
 274                 return ret;
 275
 276         return event_val;
 277 }
 278
 279 static int stk3310_write_event_config(struct iio_dev *indio_dev,
 280                                       const struct iio_chan_spec *chan,
 281                                       enum iio_event_type type,
 282                                       enum iio_event_direction dir,
 283                                       int state)
 284 {
 285         int ret;
 286         struct stk3310_data *data = iio_priv(indio_dev);
 287         struct i2c_client *client = data->client;
 288
 289         if (state < 0 || state > 7)
 290                 return -EINVAL;
 291
 292         /* Set INT_PS value */
 293         mutex_lock(&data->lock);
 294         ret = regmap_field_write(data->reg_int_ps, state);
 295         if (ret < 0)
 296                 dev_err(&client->dev, "failed to set interrupt mode\n");
 297         mutex_unlock(&data->lock);
 298
 299         return ret;
 300 }
 301
 302 static int stk3310_read_raw(struct iio_dev *indio_dev,
 303                             struct iio_chan_spec const *chan,
 304                             int *val, int *val2, long mask)
 305 {
 306         u8 reg;
 307         __be16 buf;
 308         int ret;
 309         unsigned int index;
 310         struct stk3310_data *data = iio_priv(indio_dev);
 311         struct i2c_client *client = data->client;
 312
 313         if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
 314                 return -EINVAL;
 315
 316         switch (mask) {
 317         case IIO_CHAN_INFO_RAW:
 318                 if (chan->type == IIO_LIGHT)
 319                         reg = STK3310_REG_ALS_DATA_MSB;
 320                 else
 321                         reg = STK3310_REG_PS_DATA_MSB;
 322
 323                 mutex_lock(&data->lock);
 324                 ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
 325                 if (ret < 0) {
 326                         dev_err(&client->dev, "register read failed\n");
 327                         mutex_unlock(&data->lock);
 328                         return ret;
 329                 }
 330                 *val = be16_to_cpu(buf);
 331                 mutex_unlock(&data->lock);
 332                 return IIO_VAL_INT;
 333         case IIO_CHAN_INFO_INT_TIME:
 334                 if (chan->type == IIO_LIGHT)
 335                         ret = regmap_field_read(data->reg_als_it, &index);
 336                 else
 337                         ret = regmap_field_read(data->reg_ps_it, &index);
 338                 if (ret < 0)
 339                         return ret;
 340
 341                 *val = stk3310_it_table[index][0];
 342                 *val2 = stk3310_it_table[index][1];
 343                 return IIO_VAL_INT_PLUS_MICRO;
 344         case IIO_CHAN_INFO_SCALE:
 345                 if (chan->type == IIO_LIGHT)
 346                         ret = regmap_field_read(data->reg_als_gain, &index);
 347                 else
 348                         ret = regmap_field_read(data->reg_ps_gain, &index);
 349                 if (ret < 0)
 350                         return ret;
 351
 352                 *val = stk3310_scale_table[index][0];
 353                 *val2 = stk3310_scale_table[index][1];
 354                 return IIO_VAL_INT_PLUS_MICRO;
 355         }
 356
 357         return -EINVAL;
 358 }
 359
 360 static int stk3310_write_raw(struct iio_dev *indio_dev,
 361                              struct iio_chan_spec const *chan,
 362                              int val, int val2, long mask)
 363 {
 364         int ret;
 365         int index;
 366         struct stk3310_data *data = iio_priv(indio_dev);
 367
 368         if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
 369                 return -EINVAL;
 370
 371         switch (mask) {
 372         case IIO_CHAN_INFO_INT_TIME:
 373                 index = stk3310_get_index(stk3310_it_table,
 374                                           ARRAY_SIZE(stk3310_it_table),
 375                                           val, val2);
 376                 if (index < 0)
 377                         return -EINVAL;
 378                 mutex_lock(&data->lock);
 379                 if (chan->type == IIO_LIGHT)
 380                         ret = regmap_field_write(data->reg_als_it, index);
 381                 else
 382                         ret = regmap_field_write(data->reg_ps_it, index);
 383                 if (ret < 0)
 384                         dev_err(&data->client->dev,
 385                                 "sensor configuration failed\n");
 386                 mutex_unlock(&data->lock);
 387                 return ret;
 388
 389         case IIO_CHAN_INFO_SCALE:
 390                 index = stk3310_get_index(stk3310_scale_table,
 391                                           ARRAY_SIZE(stk3310_scale_table),
 392                                           val, val2);
 393                 if (index < 0)
 394                         return -EINVAL;
 395                 mutex_lock(&data->lock);
 396                 if (chan->type == IIO_LIGHT)
 397                         ret = regmap_field_write(data->reg_als_gain, index);
 398                 else
 399                         ret = regmap_field_write(data->reg_ps_gain, index);
 400                 if (ret < 0)
 401                         dev_err(&data->client->dev,
 402                                 "sensor configuration failed\n");
 403                 mutex_unlock(&data->lock);
 404                 return ret;
 405         }
 406
 407         return -EINVAL;
 408 }
 409
 410 static const struct iio_info stk3310_info = {
 411         .read_raw               = stk3310_read_raw,
 412         .write_raw              = stk3310_write_raw,
 413         .attrs                  = &stk3310_attribute_group,
 414         .read_event_value       = stk3310_read_event,
 415         .write_event_value      = stk3310_write_event,
 416         .read_event_config      = stk3310_read_event_config,
 417         .write_event_config     = stk3310_write_event_config,
 418 };
 419
 420 static int stk3310_set_state(struct stk3310_data *data, u8 state)
 421 {
 422         int ret;
 423         struct i2c_client *client = data->client;
 424
 425         /* 3-bit state; 0b100 is not supported. */
 426         if (state > 7 || state == 4)
 427                 return -EINVAL;
 428
 429         mutex_lock(&data->lock);
 430         ret = regmap_field_write(data->reg_state, state);
 431         if (ret < 0) {
 432                 dev_err(&client->dev, "failed to change sensor state\n");
 433         } else if (state != STK3310_STATE_STANDBY) {
 434                 /* Don't reset the 'enabled' flags if we're going in standby */
 435                 data->ps_enabled  = !!(state & STK3310_STATE_EN_PS);
 436                 data->als_enabled = !!(state & STK3310_STATE_EN_ALS);
 437         }
 438         mutex_unlock(&data->lock);
 439
 440         return ret;
 441 }
 442
 443 static int stk3310_init(struct iio_dev *indio_dev)
 444 {
 445         int ret;
 446         int chipid;
 447         u8 state;
 448         struct stk3310_data *data = iio_priv(indio_dev);
 449         struct i2c_client *client = data->client;
 450
 451         ret = regmap_read(data->regmap, STK3310_REG_ID, &chipid);
 452         if (ret < 0)
 453                 return ret;
 454
 455         if (chipid != STK3310_CHIP_ID_VAL &&
 456             chipid != STK3311_CHIP_ID_VAL &&
 457             chipid != STK3311X_CHIP_ID_VAL &&
 458             chipid != STK3335_CHIP_ID_VAL) {
 459                 dev_err(&client->dev, "invalid chip id: 0x%x\n", chipid);
 460                 return -ENODEV;
 461         }
 462
 463         state = STK3310_STATE_EN_ALS | STK3310_STATE_EN_PS;
 464         ret = stk3310_set_state(data, state);
 465         if (ret < 0) {
 466                 dev_err(&client->dev, "failed to enable sensor");
 467                 return ret;
 468         }
 469
 470         /* Enable PS interrupts */
 471         ret = regmap_field_write(data->reg_int_ps, STK3310_PSINT_EN);
 472         if (ret < 0)
 473                 dev_err(&client->dev, "failed to enable interrupts!\n");
 474
 475         return ret;
 476 }
 477
 478 static bool stk3310_is_volatile_reg(struct device *dev, unsigned int reg)
 479 {
 480         switch (reg) {
 481         case STK3310_REG_ALS_DATA_MSB:
 482         case STK3310_REG_ALS_DATA_LSB:
 483         case STK3310_REG_PS_DATA_LSB:
 484         case STK3310_REG_PS_DATA_MSB:
 485         case STK3310_REG_FLAG:
 486                 return true;
 487         default:
 488                 return false;
 489         }
 490 }
 491
 492 static const struct regmap_config stk3310_regmap_config = {
 493         .name = STK3310_REGMAP_NAME,
 494         .reg_bits = 8,
 495         .val_bits = 8,
 496         .max_register = STK3310_MAX_REG,
 497         .cache_type = REGCACHE_RBTREE,
 498         .volatile_reg = stk3310_is_volatile_reg,
 499 };
 500
 501 static int stk3310_regmap_init(struct stk3310_data *data)
 502 {
 503         struct regmap *regmap;
 504         struct i2c_client *client;
 505
 506         client = data->client;
 507         regmap = devm_regmap_init_i2c(client, &stk3310_regmap_config);
 508         if (IS_ERR(regmap)) {
 509                 dev_err(&client->dev, "regmap initialization failed.\n");
 510                 return PTR_ERR(regmap);
 511         }
 512         data->regmap = regmap;
 513
 514         STK3310_REGFIELD(state);
 515         STK3310_REGFIELD(als_gain);
 516         STK3310_REGFIELD(ps_gain);
 517         STK3310_REGFIELD(als_it);
 518         STK3310_REGFIELD(ps_it);
 519         STK3310_REGFIELD(int_ps);
 520         STK3310_REGFIELD(flag_psint);
 521         STK3310_REGFIELD(flag_nf);
 522
 523         return 0;
 524 }
 525
 526 static irqreturn_t stk3310_irq_handler(int irq, void *private)
 527 {
 528         struct iio_dev *indio_dev = private;
 529         struct stk3310_data *data = iio_priv(indio_dev);
 530
 531         data->timestamp = iio_get_time_ns(indio_dev);
 532
 533         return IRQ_WAKE_THREAD;
 534 }
 535
 536 static irqreturn_t stk3310_irq_event_handler(int irq, void *private)
 537 {
 538         int ret;
 539         unsigned int dir;
 540         u64 event;
 541
 542         struct iio_dev *indio_dev = private;
 543         struct stk3310_data *data = iio_priv(indio_dev);
 544
 545         /* Read FLAG_NF to figure out what threshold has been met. */
 546         mutex_lock(&data->lock);
 547         ret = regmap_field_read(data->reg_flag_nf, &dir);
 548         if (ret < 0) {
 549                 dev_err(&data->client->dev, "register read failed\n");
 550                 mutex_unlock(&data->lock);
 551                 return ret;
 552         }
 553         event = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1,
 554                                      IIO_EV_TYPE_THRESH,
 555                                      (dir ? IIO_EV_DIR_FALLING :
 556                                             IIO_EV_DIR_RISING));
 557         iio_push_event(indio_dev, event, data->timestamp);
 558
 559         /* Reset the interrupt flag */
 560         ret = regmap_field_write(data->reg_flag_psint, 0);
 561         if (ret < 0)
 562                 dev_err(&data->client->dev, "failed to reset interrupts\n");
 563         mutex_unlock(&data->lock);
 564
 565         return IRQ_HANDLED;
 566 }
 567
 568 static int stk3310_probe(struct i2c_client *client,
 569                          const struct i2c_device_id *id)
 570 {
 571         int ret;
 572         struct iio_dev *indio_dev;
 573         struct stk3310_data *data;
 574
 575         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 576         if (!indio_dev) {
 577                 dev_err(&client->dev, "iio allocation failed!\n");
 578                 return -ENOMEM;
 579         }
 580
 581         data = iio_priv(indio_dev);
 582         data->client = client;
 583         i2c_set_clientdata(client, indio_dev);
 584         mutex_init(&data->lock);
 585
 586         ret = stk3310_regmap_init(data);
 587         if (ret < 0)
 588                 return ret;
 589
 590         indio_dev->info = &stk3310_info;
 591         indio_dev->name = STK3310_DRIVER_NAME;
 592         indio_dev->modes = INDIO_DIRECT_MODE;
 593         indio_dev->channels = stk3310_channels;
 594         indio_dev->num_channels = ARRAY_SIZE(stk3310_channels);
 595
 596         ret = stk3310_init(indio_dev);
 597         if (ret < 0)
 598                 return ret;
 599
 600         if (client->irq > 0) {
 601                 ret = devm_request_threaded_irq(&client->dev, client->irq,
 602                                                 stk3310_irq_handler,
 603                                                 stk3310_irq_event_handler,
 604                                                 IRQF_TRIGGER_FALLING |
 605                                                 IRQF_ONESHOT,
 606                                                 STK3310_EVENT, indio_dev);
 607                 if (ret < 0) {
 608                         dev_err(&client->dev, "request irq %d failed\n",
 609                                 client->irq);
 610                         goto err_standby;
 611                 }
 612         }
 613
 614         ret = iio_device_register(indio_dev);
 615         if (ret < 0) {
 616                 dev_err(&client->dev, "device_register failed\n");
 617                 goto err_standby;
 618         }
 619
 620         return 0;
 621
 622 err_standby:
 623         stk3310_set_state(data, STK3310_STATE_STANDBY);
 624         return ret;
 625 }
 626
 627 static int stk3310_remove(struct i2c_client *client)
 628 {
 629         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 630
 631         iio_device_unregister(indio_dev);
 632         return stk3310_set_state(iio_priv(indio_dev), STK3310_STATE_STANDBY);
 633 }
 634
 635 #ifdef CONFIG_PM_SLEEP
 636 static int stk3310_suspend(struct device *dev)
 637 {
 638         struct stk3310_data *data;
 639
 640         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 641
 642         return stk3310_set_state(data, STK3310_STATE_STANDBY);
 643 }
 644
 645 static int stk3310_resume(struct device *dev)
 646 {
 647         u8 state = 0;
 648         struct stk3310_data *data;
 649
 650         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 651         if (data->ps_enabled)
 652                 state |= STK3310_STATE_EN_PS;
 653         if (data->als_enabled)
 654                 state |= STK3310_STATE_EN_ALS;
 655
 656         return stk3310_set_state(data, state);
 657 }
 658
 659 static SIMPLE_DEV_PM_OPS(stk3310_pm_ops, stk3310_suspend, stk3310_resume);
 660
 661 #define STK3310_PM_OPS (&stk3310_pm_ops)
 662 #else
 663 #define STK3310_PM_OPS NULL
 664 #endif
 665
 666 static const struct i2c_device_id stk3310_i2c_id[] = {
 667         {"STK3310", 0},
 668         {"STK3311", 0},
 669         {"STK3335", 0},
 670         {}
 671 };
 672 MODULE_DEVICE_TABLE(i2c, stk3310_i2c_id);
 673
 674 static const struct acpi_device_id stk3310_acpi_id[] = {
 675         {"STK3310", 0},
 676         {"STK3311", 0},
 677         {"STK3335", 0},
 678         {}
 679 };
 680
 681 MODULE_DEVICE_TABLE(acpi, stk3310_acpi_id);
 682
 683 static const struct of_device_id stk3310_of_match[] = {
 684         { .compatible = "sensortek,stk3310", },
 685         { .compatible = "sensortek,stk3311", },
 686         { .compatible = "sensortek,stk3335", },
 687         {}
 688 };
 689 MODULE_DEVICE_TABLE(of, stk3310_of_match);
 690
 691 static struct i2c_driver stk3310_driver = {
 692         .driver = {
 693                 .name = "stk3310",
 694                 .of_match_table = stk3310_of_match,
 695                 .pm = STK3310_PM_OPS,
 696                 .acpi_match_table = ACPI_PTR(stk3310_acpi_id),
 697         },
 698         .probe =            stk3310_probe,
 699         .remove =           stk3310_remove,
 700         .id_table =         stk3310_i2c_id,
 701 };
 702
 703 module_i2c_driver(stk3310_driver);
 704
 705 MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
 706 MODULE_DESCRIPTION("STK3310 Ambient Light and Proximity Sensor driver");
 707 MODULE_LICENSE("GPL v2");