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                     0x01
  39 #define STK3310_STATE_EN_ALS                    0x02
  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 #define STK3310_GPIO                            "stk3310_gpio"
  51
  52 #define STK3310_SCALE_AVAILABLE                 "6.4 1.6 0.4 0.1"
  53
  54 #define STK3310_IT_AVAILABLE \
  55         "0.000185 0.000370 0.000741 0.001480 0.002960 0.005920 0.011840 " \
  56         "0.023680 0.047360 0.094720 0.189440 0.378880 0.757760 1.515520 " \
  57         "3.031040 6.062080"
  58
  59 #define STK3310_REGFIELD(name)                                              \
  60         do {                                                                \
  61                 data->reg_##name =                                          \
  62                         devm_regmap_field_alloc(&client->dev, regmap,       \
  63                                 stk3310_reg_field_##name);                  \
  64                 if (IS_ERR(data->reg_##name)) {                             \
  65                         dev_err(&client->dev, "reg field alloc failed.\n"); \
  66                         return PTR_ERR(data->reg_##name);                   \
  67                 }                                                           \
  68         } while (0)
  69
  70 static const struct reg_field stk3310_reg_field_state =
  71                                 REG_FIELD(STK3310_REG_STATE, 0, 2);
  72 static const struct reg_field stk3310_reg_field_als_gain =
  73                                 REG_FIELD(STK3310_REG_ALSCTRL, 4, 5);
  74 static const struct reg_field stk3310_reg_field_ps_gain =
  75                                 REG_FIELD(STK3310_REG_PSCTRL, 4, 5);
  76 static const struct reg_field stk3310_reg_field_als_it =
  77                                 REG_FIELD(STK3310_REG_ALSCTRL, 0, 3);
  78 static const struct reg_field stk3310_reg_field_ps_it =
  79                                 REG_FIELD(STK3310_REG_PSCTRL, 0, 3);
  80 static const struct reg_field stk3310_reg_field_int_ps =
  81                                 REG_FIELD(STK3310_REG_INT, 0, 2);
  82 static const struct reg_field stk3310_reg_field_flag_psint =
  83                                 REG_FIELD(STK3310_REG_FLAG, 4, 4);
  84 static const struct reg_field stk3310_reg_field_flag_nf =
  85                                 REG_FIELD(STK3310_REG_FLAG, 0, 0);
  86
  87 /* Estimate maximum proximity values with regard to measurement scale. */
  88 static const int stk3310_ps_max[4] = {
  89         STK3310_PS_MAX_VAL / 640,
  90         STK3310_PS_MAX_VAL / 160,
  91         STK3310_PS_MAX_VAL /  40,
  92         STK3310_PS_MAX_VAL /  10
  93 };
  94
  95 static const int stk3310_scale_table[][2] = {
  96         {6, 400000}, {1, 600000}, {0, 400000}, {0, 100000}
  97 };
  98
  99 /* Integration time in seconds, microseconds */
 100 static const int stk3310_it_table[][2] = {
 101         {0, 185},       {0, 370},       {0, 741},       {0, 1480},
 102         {0, 2960},      {0, 5920},      {0, 11840},     {0, 23680},
 103         {0, 47360},     {0, 94720},     {0, 189440},    {0, 378880},
 104         {0, 757760},    {1, 515520},    {3, 31040},     {6, 62080},
 105 };
 106
 107 struct stk3310_data {
 108         struct i2c_client *client;
 109         struct mutex lock;
 110         bool als_enabled;
 111         bool ps_enabled;
 112         u64 timestamp;
 113         struct regmap *regmap;
 114         struct regmap_field *reg_state;
 115         struct regmap_field *reg_als_gain;
 116         struct regmap_field *reg_ps_gain;
 117         struct regmap_field *reg_als_it;
 118         struct regmap_field *reg_ps_it;
 119         struct regmap_field *reg_int_ps;
 120         struct regmap_field *reg_flag_psint;
 121         struct regmap_field *reg_flag_nf;
 122 };
 123
 124 static const struct iio_event_spec stk3310_events[] = {
 125         /* Proximity event */
 126         {
 127                 .type = IIO_EV_TYPE_THRESH,
 128                 .dir = IIO_EV_DIR_RISING,
 129                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 130                                  BIT(IIO_EV_INFO_ENABLE),
 131         },
 132         /* Out-of-proximity event */
 133         {
 134                 .type = IIO_EV_TYPE_THRESH,
 135                 .dir = IIO_EV_DIR_FALLING,
 136                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 137                                  BIT(IIO_EV_INFO_ENABLE),
 138         },
 139 };
 140
 141 static const struct iio_chan_spec stk3310_channels[] = {
 142         {
 143                 .type = IIO_LIGHT,
 144                 .info_mask_separate =
 145                         BIT(IIO_CHAN_INFO_RAW) |
 146                         BIT(IIO_CHAN_INFO_SCALE) |
 147                         BIT(IIO_CHAN_INFO_INT_TIME),
 148         },
 149         {
 150                 .type = IIO_PROXIMITY,
 151                 .info_mask_separate =
 152                         BIT(IIO_CHAN_INFO_RAW) |
 153                         BIT(IIO_CHAN_INFO_SCALE) |
 154                         BIT(IIO_CHAN_INFO_INT_TIME),
 155                 .event_spec = stk3310_events,
 156                 .num_event_specs = ARRAY_SIZE(stk3310_events),
 157         }
 158 };
 159
 160 static IIO_CONST_ATTR(in_illuminance_scale_available, STK3310_SCALE_AVAILABLE);
 161
 162 static IIO_CONST_ATTR(in_proximity_scale_available, STK3310_SCALE_AVAILABLE);
 163
 164 static IIO_CONST_ATTR(in_illuminance_integration_time_available,
 165                       STK3310_IT_AVAILABLE);
 166
 167 static IIO_CONST_ATTR(in_proximity_integration_time_available,
 168                       STK3310_IT_AVAILABLE);
 169
 170 static struct attribute *stk3310_attributes[] = {
 171         &iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
 172         &iio_const_attr_in_proximity_scale_available.dev_attr.attr,
 173         &iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
 174         &iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
 175         NULL,
 176 };
 177
 178 static const struct attribute_group stk3310_attribute_group = {
 179         .attrs = stk3310_attributes
 180 };
 181
 182 static int stk3310_get_index(const int table[][2], int table_size,
 183                              int val, int val2)
 184 {
 185         int i;
 186
 187         for (i = 0; i < table_size; i++) {
 188                 if (val == table[i][0] && val2 == table[i][1])
 189                         return i;
 190         }
 191
 192         return -EINVAL;
 193 }
 194
 195 static int stk3310_read_event(struct iio_dev *indio_dev,
 196                               const struct iio_chan_spec *chan,
 197                               enum iio_event_type type,
 198                               enum iio_event_direction dir,
 199                               enum iio_event_info info,
 200                               int *val, int *val2)
 201 {
 202         u8 reg;
 203         u16 buf;
 204         int ret;
 205         struct stk3310_data *data = iio_priv(indio_dev);
 206
 207         if (info != IIO_EV_INFO_VALUE)
 208                 return -EINVAL;
 209
 210         /* Only proximity interrupts are implemented at the moment. */
 211         if (dir == IIO_EV_DIR_RISING)
 212                 reg = STK3310_REG_THDH_PS;
 213         else if (dir == IIO_EV_DIR_FALLING)
 214                 reg = STK3310_REG_THDL_PS;
 215         else
 216                 return -EINVAL;
 217
 218         mutex_lock(&data->lock);
 219         ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
 220         mutex_unlock(&data->lock);
 221         if (ret < 0) {
 222                 dev_err(&data->client->dev, "register read failed\n");
 223                 return ret;
 224         }
 225         *val = swab16(buf);
 226
 227         return IIO_VAL_INT;
 228 }
 229
 230 static int stk3310_write_event(struct iio_dev *indio_dev,
 231                                const struct iio_chan_spec *chan,
 232                                enum iio_event_type type,
 233                                enum iio_event_direction dir,
 234                                enum iio_event_info info,
 235                                int val, int val2)
 236 {
 237         u8 reg;
 238         u16 buf;
 239         int ret;
 240         unsigned int index;
 241         struct stk3310_data *data = iio_priv(indio_dev);
 242         struct i2c_client *client = data->client;
 243
 244         regmap_field_read(data->reg_ps_gain, &index);
 245         if (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 = swab16(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         struct stk3310_data *data = iio_priv(indio_dev);
 270
 271         regmap_field_read(data->reg_int_ps, &event_val);
 272
 273         return event_val;
 274 }
 275
 276 static int stk3310_write_event_config(struct iio_dev *indio_dev,
 277                                       const struct iio_chan_spec *chan,
 278                                       enum iio_event_type type,
 279                                       enum iio_event_direction dir,
 280                                       int state)
 281 {
 282         int ret;
 283         struct stk3310_data *data = iio_priv(indio_dev);
 284         struct i2c_client *client = data->client;
 285
 286         if (state < 0 || state > 7)
 287                 return -EINVAL;
 288
 289         /* Set INT_PS value */
 290         mutex_lock(&data->lock);
 291         ret = regmap_field_write(data->reg_int_ps, state);
 292         if (ret < 0)
 293                 dev_err(&client->dev, "failed to set interrupt mode\n");
 294         mutex_unlock(&data->lock);
 295
 296         return ret;
 297 }
 298
 299 static int stk3310_read_raw(struct iio_dev *indio_dev,
 300                             struct iio_chan_spec const *chan,
 301                             int *val, int *val2, long mask)
 302 {
 303         u8 reg;
 304         u16 buf;
 305         int ret;
 306         unsigned int index;
 307         struct stk3310_data *data = iio_priv(indio_dev);
 308         struct i2c_client *client = data->client;
 309
 310         switch (mask) {
 311         case IIO_CHAN_INFO_RAW:
 312                 if (chan->type == IIO_LIGHT)
 313                         reg = STK3310_REG_ALS_DATA_MSB;
 314                 else if (chan->type == IIO_PROXIMITY)
 315                         reg = STK3310_REG_PS_DATA_MSB;
 316                 else
 317                         return -EINVAL;
 318                 mutex_lock(&data->lock);
 319                 ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
 320                 if (ret < 0) {
 321                         dev_err(&client->dev, "register read failed\n");
 322                         mutex_unlock(&data->lock);
 323                         return ret;
 324                 }
 325                 *val = swab16(buf);
 326                 mutex_unlock(&data->lock);
 327                 return IIO_VAL_INT;
 328         case IIO_CHAN_INFO_INT_TIME:
 329                 if (chan->type == IIO_LIGHT)
 330                         regmap_field_read(data->reg_als_it, &index);
 331                 else
 332                         regmap_field_read(data->reg_ps_it, &index);
 333                 *val = stk3310_it_table[index][0];
 334                 *val2 = stk3310_it_table[index][1];
 335                 return IIO_VAL_INT_PLUS_MICRO;
 336         case IIO_CHAN_INFO_SCALE:
 337                 if (chan->type == IIO_LIGHT)
 338                         regmap_field_read(data->reg_als_gain, &index);
 339                 else
 340                         regmap_field_read(data->reg_ps_gain, &index);
 341                 *val = stk3310_scale_table[index][0];
 342                 *val2 = stk3310_scale_table[index][1];
 343                 return IIO_VAL_INT_PLUS_MICRO;
 344         }
 345
 346         return -EINVAL;
 347 }
 348
 349 static int stk3310_write_raw(struct iio_dev *indio_dev,
 350                              struct iio_chan_spec const *chan,
 351                              int val, int val2, long mask)
 352 {
 353         int ret;
 354         int index;
 355         struct stk3310_data *data = iio_priv(indio_dev);
 356
 357         switch (mask) {
 358         case IIO_CHAN_INFO_INT_TIME:
 359                 index = stk3310_get_index(stk3310_it_table,
 360                                           ARRAY_SIZE(stk3310_it_table),
 361                                           val, val2);
 362                 if (index < 0)
 363                         return -EINVAL;
 364                 mutex_lock(&data->lock);
 365                 if (chan->type == IIO_LIGHT)
 366                         ret = regmap_field_write(data->reg_als_it, index);
 367                 else
 368                         ret = regmap_field_write(data->reg_ps_it, index);
 369                 if (ret < 0)
 370                         dev_err(&data->client->dev,
 371                                         "sensor configuration failed\n");
 372                 mutex_unlock(&data->lock);
 373                 return ret;
 374
 375         case IIO_CHAN_INFO_SCALE:
 376                 index = stk3310_get_index(stk3310_scale_table,
 377                                           ARRAY_SIZE(stk3310_scale_table),
 378                                           val, val2);
 379                 if (index < 0)
 380                         return -EINVAL;
 381                 mutex_lock(&data->lock);
 382                 if (chan->type == IIO_LIGHT)
 383                         ret = regmap_field_write(data->reg_als_gain, index);
 384                 else
 385                         ret = regmap_field_write(data->reg_ps_gain, index);
 386                 if (ret < 0)
 387                         dev_err(&data->client->dev,
 388                                         "sensor configuration failed\n");
 389                 mutex_unlock(&data->lock);
 390                 return ret;
 391         }
 392
 393         return -EINVAL;
 394 }
 395
 396 static const struct iio_info stk3310_info = {
 397         .driver_module          = THIS_MODULE,
 398         .read_raw               = stk3310_read_raw,
 399         .write_raw              = stk3310_write_raw,
 400         .attrs                  = &stk3310_attribute_group,
 401         .read_event_value       = stk3310_read_event,
 402         .write_event_value      = stk3310_write_event,
 403         .read_event_config      = stk3310_read_event_config,
 404         .write_event_config     = stk3310_write_event_config,
 405 };
 406
 407 static int stk3310_set_state(struct stk3310_data *data, u8 state)
 408 {
 409         int ret;
 410         struct i2c_client *client = data->client;
 411
 412         /* 3-bit state; 0b100 is not supported. */
 413         if (state > 7 || state == 4)
 414                 return -EINVAL;
 415
 416         mutex_lock(&data->lock);
 417         ret = regmap_field_write(data->reg_state, state);
 418         if (ret < 0) {
 419                 dev_err(&client->dev, "failed to change sensor state\n");
 420         } else if (state != STK3310_STATE_STANDBY) {
 421                 /* Don't reset the 'enabled' flags if we're going in standby */
 422                 data->ps_enabled  = !!(state & 0x01);
 423                 data->als_enabled = !!(state & 0x02);
 424         }
 425         mutex_unlock(&data->lock);
 426
 427         return ret;
 428 }
 429
 430 static int stk3310_init(struct iio_dev *indio_dev)
 431 {
 432         int ret;
 433         int chipid;
 434         u8 state;
 435         struct stk3310_data *data = iio_priv(indio_dev);
 436         struct i2c_client *client = data->client;
 437
 438         regmap_read(data->regmap, STK3310_REG_ID, &chipid);
 439         if (chipid != STK3310_CHIP_ID_VAL &&
 440             chipid != STK3311_CHIP_ID_VAL) {
 441                 dev_err(&client->dev, "invalid chip id: 0x%x\n", chipid);
 442                 return -ENODEV;
 443         }
 444
 445         state = STK3310_STATE_EN_ALS | STK3310_STATE_EN_PS;
 446         ret = stk3310_set_state(data, state);
 447         if (ret < 0) {
 448                 dev_err(&client->dev, "failed to enable sensor");
 449                 return ret;
 450         }
 451
 452         /* Enable PS interrupts */
 453         ret = regmap_field_write(data->reg_int_ps, STK3310_PSINT_EN);
 454         if (ret < 0)
 455                 dev_err(&client->dev, "failed to enable interrupts!\n");
 456
 457         return ret;
 458 }
 459
 460 static int stk3310_gpio_probe(struct i2c_client *client)
 461 {
 462         struct device *dev;
 463         struct gpio_desc *gpio;
 464         int ret;
 465
 466         if (!client)
 467                 return -EINVAL;
 468
 469         dev = &client->dev;
 470
 471         /* gpio interrupt pin */
 472         gpio = devm_gpiod_get_index(dev, STK3310_GPIO, 0);
 473         if (IS_ERR(gpio)) {
 474                 dev_err(dev, "acpi gpio get index failed\n");
 475                 return PTR_ERR(gpio);
 476         }
 477
 478         ret = gpiod_direction_input(gpio);
 479         if (ret)
 480                 return ret;
 481
 482         ret = gpiod_to_irq(gpio);
 483         dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
 484
 485         return ret;
 486 }
 487
 488 static bool stk3310_is_volatile_reg(struct device *dev, unsigned int reg)
 489 {
 490         switch (reg) {
 491         case STK3310_REG_ALS_DATA_MSB:
 492         case STK3310_REG_ALS_DATA_LSB:
 493         case STK3310_REG_PS_DATA_LSB:
 494         case STK3310_REG_PS_DATA_MSB:
 495         case STK3310_REG_FLAG:
 496                 return true;
 497         default:
 498                 return false;
 499         }
 500 }
 501
 502 static struct regmap_config stk3310_regmap_config = {
 503         .name = STK3310_REGMAP_NAME,
 504         .reg_bits = 8,
 505         .val_bits = 8,
 506         .max_register = STK3310_MAX_REG,
 507         .cache_type = REGCACHE_RBTREE,
 508         .volatile_reg = stk3310_is_volatile_reg,
 509 };
 510
 511 static int stk3310_regmap_init(struct stk3310_data *data)
 512 {
 513         struct regmap *regmap;
 514         struct i2c_client *client;
 515
 516         client = data->client;
 517         regmap = devm_regmap_init_i2c(client, &stk3310_regmap_config);
 518         if (IS_ERR(regmap)) {
 519                 dev_err(&client->dev, "regmap initialization failed.\n");
 520                 return PTR_ERR(regmap);
 521         }
 522         data->regmap = regmap;
 523
 524         STK3310_REGFIELD(state);
 525         STK3310_REGFIELD(als_gain);
 526         STK3310_REGFIELD(ps_gain);
 527         STK3310_REGFIELD(als_it);
 528         STK3310_REGFIELD(ps_it);
 529         STK3310_REGFIELD(int_ps);
 530         STK3310_REGFIELD(flag_psint);
 531         STK3310_REGFIELD(flag_nf);
 532
 533         return 0;
 534 }
 535
 536 static irqreturn_t stk3310_irq_handler(int irq, void *private)
 537 {
 538         struct iio_dev *indio_dev = private;
 539         struct stk3310_data *data = iio_priv(indio_dev);
 540
 541         data->timestamp = iio_get_time_ns();
 542
 543         return IRQ_WAKE_THREAD;
 544 }
 545
 546 static irqreturn_t stk3310_irq_event_handler(int irq, void *private)
 547 {
 548         int ret;
 549         unsigned int dir;
 550         u64 event;
 551
 552         struct iio_dev *indio_dev = private;
 553         struct stk3310_data *data = iio_priv(indio_dev);
 554
 555         /* Read FLAG_NF to figure out what threshold has been met. */
 556         mutex_lock(&data->lock);
 557         ret = regmap_field_read(data->reg_flag_nf, &dir);
 558         if (ret < 0) {
 559                 dev_err(&data->client->dev, "register read failed\n");
 560                 mutex_unlock(&data->lock);
 561                 return ret;
 562         }
 563         event = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1,
 564                                      IIO_EV_TYPE_THRESH,
 565                                      (dir ? IIO_EV_DIR_FALLING :
 566                                             IIO_EV_DIR_RISING));
 567         iio_push_event(indio_dev, event, data->timestamp);
 568
 569         /* Reset the interrupt flag */
 570         ret = regmap_field_write(data->reg_flag_psint, 0);
 571         if (ret < 0)
 572                 dev_err(&data->client->dev, "failed to reset interrupts\n");
 573         mutex_unlock(&data->lock);
 574
 575         return IRQ_HANDLED;
 576 }
 577
 578 static int stk3310_probe(struct i2c_client *client,
 579                          const struct i2c_device_id *id)
 580 {
 581         int ret;
 582         struct iio_dev *indio_dev;
 583         struct stk3310_data *data;
 584
 585         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 586         if (!indio_dev) {
 587                 dev_err(&client->dev, "iio allocation failed!\n");
 588                 return -ENOMEM;
 589         }
 590
 591         data = iio_priv(indio_dev);
 592         data->client = client;
 593         i2c_set_clientdata(client, indio_dev);
 594         mutex_init(&data->lock);
 595
 596         ret = stk3310_regmap_init(data);
 597         if (ret < 0)
 598                 return ret;
 599
 600         indio_dev->dev.parent = &client->dev;
 601         indio_dev->info = &stk3310_info;
 602         indio_dev->name = STK3310_DRIVER_NAME;
 603         indio_dev->modes = INDIO_DIRECT_MODE;
 604         indio_dev->channels = stk3310_channels;
 605         indio_dev->num_channels = ARRAY_SIZE(stk3310_channels);
 606
 607         ret = stk3310_init(indio_dev);
 608         if (ret < 0)
 609                 return ret;
 610
 611         ret = iio_device_register(indio_dev);
 612         if (ret < 0) {
 613                 dev_err(&client->dev, "device_register failed\n");
 614                 stk3310_set_state(data, STK3310_STATE_STANDBY);
 615         }
 616
 617         if (client->irq <= 0)
 618                 client->irq = stk3310_gpio_probe(client);
 619
 620         if (client->irq >= 0) {
 621                 ret = devm_request_threaded_irq(&client->dev, client->irq,
 622                                                 stk3310_irq_handler,
 623                                                 stk3310_irq_event_handler,
 624                                                 IRQF_TRIGGER_FALLING |
 625                                                 IRQF_ONESHOT,
 626                                                 STK3310_EVENT, indio_dev);
 627                 if (ret < 0)
 628                         dev_err(&client->dev, "request irq %d failed\n",
 629                                         client->irq);
 630         }
 631
 632         return ret;
 633 }
 634
 635 static int stk3310_remove(struct i2c_client *client)
 636 {
 637         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 638
 639         iio_device_unregister(indio_dev);
 640         return stk3310_set_state(iio_priv(indio_dev), STK3310_STATE_STANDBY);
 641 }
 642
 643 #ifdef CONFIG_PM_SLEEP
 644 static int stk3310_suspend(struct device *dev)
 645 {
 646         struct stk3310_data *data;
 647
 648         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 649
 650         return stk3310_set_state(data, STK3310_STATE_STANDBY);
 651 }
 652
 653 static int stk3310_resume(struct device *dev)
 654 {
 655         int state = 0;
 656         struct stk3310_data *data;
 657
 658         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 659         if (data->ps_enabled)
 660                 state |= STK3310_STATE_EN_PS;
 661         if (data->als_enabled)
 662                 state |= STK3310_STATE_EN_ALS;
 663
 664         return stk3310_set_state(data, state);
 665 }
 666
 667 static SIMPLE_DEV_PM_OPS(stk3310_pm_ops, stk3310_suspend, stk3310_resume);
 668
 669 #define STK3310_PM_OPS (&stk3310_pm_ops)
 670 #else
 671 #define STK3310_PM_OPS NULL
 672 #endif
 673
 674 static const struct i2c_device_id stk3310_i2c_id[] = {
 675         {"STK3310", 0},
 676         {"STK3311", 0},
 677         {}
 678 };
 679
 680 static const struct acpi_device_id stk3310_acpi_id[] = {
 681         {"STK3310", 0},
 682         {"STK3311", 0},
 683         {}
 684 };
 685
 686 MODULE_DEVICE_TABLE(acpi, stk3310_acpi_id);
 687
 688 static struct i2c_driver stk3310_driver = {
 689         .driver = {
 690                 .name = "stk3310",
 691                 .pm = STK3310_PM_OPS,
 692                 .acpi_match_table = ACPI_PTR(stk3310_acpi_id),
 693         },
 694         .probe =            stk3310_probe,
 695         .remove =           stk3310_remove,
 696         .id_table =         stk3310_i2c_id,
 697 };
 698
 699 module_i2c_driver(stk3310_driver);
 700
 701 MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
 702 MODULE_DESCRIPTION("STK3310 Ambient Light and Proximity Sensor driver");
 703 MODULE_LICENSE("GPL v2");