kernel/drivers/iio/light/stk3310.c

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