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