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 #define STK3310_THRESH_MAX                      0xFFFF
  47
  48 #define STK3310_DRIVER_NAME                     "stk3310"
  49 #define STK3310_REGMAP_NAME                     "stk3310_regmap"
  50 #define STK3310_EVENT                           "stk3310_event"
  51 #define STK3310_GPIO                            "stk3310_gpio"
  52
  53 #define STK3310_SCALE_AVAILABLE                 "6.4 1.6 0.4 0.1"
  54
  55 #define STK3310_IT_AVAILABLE \
  56         "0.000185 0.000370 0.000741 0.001480 0.002960 0.005920 0.011840 " \
  57         "0.023680 0.047360 0.094720 0.189440 0.378880 0.757760 1.515520 " \
  58         "3.031040 6.062080"
  59
  60 #define STK3310_REGFIELD(name)                                              \
  61         do {                                                                \
  62                 data->reg_##name =                                          \
  63                         devm_regmap_field_alloc(&client->dev, regmap,       \
  64                                 stk3310_reg_field_##name);                  \
  65                 if (IS_ERR(data->reg_##name)) {                             \
  66                         dev_err(&client->dev, "reg field alloc failed.\n"); \
  67                         return PTR_ERR(data->reg_##name);                   \
  68                 }                                                           \
  69         } while (0)
  70
  71 static const struct reg_field stk3310_reg_field_state =
  72                                 REG_FIELD(STK3310_REG_STATE, 0, 2);
  73 static const struct reg_field stk3310_reg_field_als_gain =
  74                                 REG_FIELD(STK3310_REG_ALSCTRL, 4, 5);
  75 static const struct reg_field stk3310_reg_field_ps_gain =
  76                                 REG_FIELD(STK3310_REG_PSCTRL, 4, 5);
  77 static const struct reg_field stk3310_reg_field_als_it =
  78                                 REG_FIELD(STK3310_REG_ALSCTRL, 0, 3);
  79 static const struct reg_field stk3310_reg_field_ps_it =
  80                                 REG_FIELD(STK3310_REG_PSCTRL, 0, 3);
  81 static const struct reg_field stk3310_reg_field_int_ps =
  82                                 REG_FIELD(STK3310_REG_INT, 0, 2);
  83 static const struct reg_field stk3310_reg_field_flag_psint =
  84                                 REG_FIELD(STK3310_REG_FLAG, 4, 4);
  85 static const struct reg_field stk3310_reg_field_flag_nf =
  86                                 REG_FIELD(STK3310_REG_FLAG, 0, 0);
  87 /*
  88  * Maximum PS values with regard to scale. Used to export the 'inverse'
  89  * PS value (high values for far objects, low values for near objects).
  90  */
  91 static const int stk3310_ps_max[4] = {
  92         STK3310_PS_MAX_VAL / 64,
  93         STK3310_PS_MAX_VAL / 16,
  94         STK3310_PS_MAX_VAL /  4,
  95         STK3310_PS_MAX_VAL,
  96 };
  97
  98 static const int stk3310_scale_table[][2] = {
  99         {6, 400000}, {1, 600000}, {0, 400000}, {0, 100000}
 100 };
 101
 102 /* Integration time in seconds, microseconds */
 103 static const int stk3310_it_table[][2] = {
 104         {0, 185},       {0, 370},       {0, 741},       {0, 1480},
 105         {0, 2960},      {0, 5920},      {0, 11840},     {0, 23680},
 106         {0, 47360},     {0, 94720},     {0, 189440},    {0, 378880},
 107         {0, 757760},    {1, 515520},    {3, 31040},     {6, 62080},
 108 };
 109
 110 struct stk3310_data {
 111         struct i2c_client *client;
 112         struct mutex lock;
 113         bool als_enabled;
 114         bool ps_enabled;
 115         u64 timestamp;
 116         struct regmap *regmap;
 117         struct regmap_field *reg_state;
 118         struct regmap_field *reg_als_gain;
 119         struct regmap_field *reg_ps_gain;
 120         struct regmap_field *reg_als_it;
 121         struct regmap_field *reg_ps_it;
 122         struct regmap_field *reg_int_ps;
 123         struct regmap_field *reg_flag_psint;
 124         struct regmap_field *reg_flag_nf;
 125 };
 126
 127 static const struct iio_event_spec stk3310_events[] = {
 128         /* Proximity event */
 129         {
 130                 .type = IIO_EV_TYPE_THRESH,
 131                 .dir = IIO_EV_DIR_FALLING,
 132                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 133                                  BIT(IIO_EV_INFO_ENABLE),
 134         },
 135         /* Out-of-proximity event */
 136         {
 137                 .type = IIO_EV_TYPE_THRESH,
 138                 .dir = IIO_EV_DIR_RISING,
 139                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 140                                  BIT(IIO_EV_INFO_ENABLE),
 141         },
 142 };
 143
 144 static const struct iio_chan_spec stk3310_channels[] = {
 145         {
 146                 .type = IIO_LIGHT,
 147                 .info_mask_separate =
 148                         BIT(IIO_CHAN_INFO_RAW) |
 149                         BIT(IIO_CHAN_INFO_SCALE) |
 150                         BIT(IIO_CHAN_INFO_INT_TIME),
 151         },
 152         {
 153                 .type = IIO_PROXIMITY,
 154                 .info_mask_separate =
 155                         BIT(IIO_CHAN_INFO_RAW) |
 156                         BIT(IIO_CHAN_INFO_SCALE) |
 157                         BIT(IIO_CHAN_INFO_INT_TIME),
 158                 .event_spec = stk3310_events,
 159                 .num_event_specs = ARRAY_SIZE(stk3310_events),
 160         }
 161 };
 162
 163 static IIO_CONST_ATTR(in_illuminance_scale_available, STK3310_SCALE_AVAILABLE);
 164
 165 static IIO_CONST_ATTR(in_proximity_scale_available, STK3310_SCALE_AVAILABLE);
 166
 167 static IIO_CONST_ATTR(in_illuminance_integration_time_available,
 168                       STK3310_IT_AVAILABLE);
 169
 170 static IIO_CONST_ATTR(in_proximity_integration_time_available,
 171                       STK3310_IT_AVAILABLE);
 172
 173 static struct attribute *stk3310_attributes[] = {
 174         &iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
 175         &iio_const_attr_in_proximity_scale_available.dev_attr.attr,
 176         &iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
 177         &iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
 178         NULL,
 179 };
 180
 181 static const struct attribute_group stk3310_attribute_group = {
 182         .attrs = stk3310_attributes
 183 };
 184
 185 static int stk3310_get_index(const int table[][2], int table_size,
 186                              int val, int val2)
 187 {
 188         int i;
 189
 190         for (i = 0; i < table_size; i++) {
 191                 if (val == table[i][0] && val2 == table[i][1])
 192                         return i;
 193         }
 194
 195         return -EINVAL;
 196 }
 197
 198 static int stk3310_read_event(struct iio_dev *indio_dev,
 199                               const struct iio_chan_spec *chan,
 200                               enum iio_event_type type,
 201                               enum iio_event_direction dir,
 202                               enum iio_event_info info,
 203                               int *val, int *val2)
 204 {
 205         u8 reg;
 206         u16 buf;
 207         int ret;
 208         unsigned int index;
 209         struct stk3310_data *data = iio_priv(indio_dev);
 210
 211         if (info != IIO_EV_INFO_VALUE)
 212                 return -EINVAL;
 213
 214         /*
 215          * Only proximity interrupts are implemented at the moment.
 216          * Since we're inverting proximity values, the sensor's 'high'
 217          * threshold will become our 'low' threshold, associated with
 218          * 'near' events. Similarly, the sensor's 'low' threshold will
 219          * be our 'high' threshold, associated with 'far' events.
 220          */
 221         if (dir == IIO_EV_DIR_RISING)
 222                 reg = STK3310_REG_THDL_PS;
 223         else if (dir == IIO_EV_DIR_FALLING)
 224                 reg = STK3310_REG_THDH_PS;
 225         else
 226                 return -EINVAL;
 227
 228         mutex_lock(&data->lock);
 229         ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
 230         mutex_unlock(&data->lock);
 231         if (ret < 0) {
 232                 dev_err(&data->client->dev, "register read failed\n");
 233                 return ret;
 234         }
 235         regmap_field_read(data->reg_ps_gain, &index);
 236         *val = swab16(stk3310_ps_max[index] - buf);
 237
 238         return IIO_VAL_INT;
 239 }
 240
 241 static int stk3310_write_event(struct iio_dev *indio_dev,
 242                                const struct iio_chan_spec *chan,
 243                                enum iio_event_type type,
 244                                enum iio_event_direction dir,
 245                                enum iio_event_info info,
 246                                int val, int val2)
 247 {
 248         u8 reg;
 249         u16 buf;
 250         int ret;
 251         unsigned int index;
 252         struct stk3310_data *data = iio_priv(indio_dev);
 253         struct i2c_client *client = data->client;
 254
 255         regmap_field_read(data->reg_ps_gain, &index);
 256         if (val > stk3310_ps_max[index])
 257                 return -EINVAL;
 258
 259         if (dir == IIO_EV_DIR_RISING)
 260                 reg = STK3310_REG_THDL_PS;
 261         else if (dir == IIO_EV_DIR_FALLING)
 262                 reg = STK3310_REG_THDH_PS;
 263         else
 264                 return -EINVAL;
 265
 266         buf = swab16(stk3310_ps_max[index] - val);
 267         ret = regmap_bulk_write(data->regmap, reg, &buf, 2);
 268         if (ret < 0)
 269                 dev_err(&client->dev, "failed to set PS threshold!\n");
 270
 271         return ret;
 272 }
 273
 274 static int stk3310_read_event_config(struct iio_dev *indio_dev,
 275                                      const struct iio_chan_spec *chan,
 276                                      enum iio_event_type type,
 277                                      enum iio_event_direction dir)
 278 {
 279         unsigned int event_val;
 280         struct stk3310_data *data = iio_priv(indio_dev);
 281
 282         regmap_field_read(data->reg_int_ps, &event_val);
 283
 284         return event_val;
 285 }
 286
 287 static int stk3310_write_event_config(struct iio_dev *indio_dev,
 288                                       const struct iio_chan_spec *chan,
 289                                       enum iio_event_type type,
 290                                       enum iio_event_direction dir,
 291                                       int state)
 292 {
 293         int ret;
 294         struct stk3310_data *data = iio_priv(indio_dev);
 295         struct i2c_client *client = data->client;
 296
 297         if (state < 0 || state > 7)
 298                 return -EINVAL;
 299
 300         /* Set INT_PS value */
 301         mutex_lock(&data->lock);
 302         ret = regmap_field_write(data->reg_int_ps, state);
 303         if (ret < 0)
 304                 dev_err(&client->dev, "failed to set interrupt mode\n");
 305         mutex_unlock(&data->lock);
 306
 307         return ret;
 308 }
 309
 310 static int stk3310_read_raw(struct iio_dev *indio_dev,
 311                             struct iio_chan_spec const *chan,
 312                             int *val, int *val2, long mask)
 313 {
 314         u8 reg;
 315         u16 buf;
 316         int ret;
 317         unsigned int index;
 318         struct stk3310_data *data = iio_priv(indio_dev);
 319         struct i2c_client *client = data->client;
 320
 321         switch (mask) {
 322         case IIO_CHAN_INFO_RAW:
 323                 if (chan->type == IIO_LIGHT)
 324                         reg = STK3310_REG_ALS_DATA_MSB;
 325                 else if (chan->type == IIO_PROXIMITY)
 326                         reg = STK3310_REG_PS_DATA_MSB;
 327                 else
 328                         return -EINVAL;
 329                 mutex_lock(&data->lock);
 330                 ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
 331                 if (ret < 0) {
 332                         dev_err(&client->dev, "register read failed\n");
 333                         mutex_unlock(&data->lock);
 334                         return ret;
 335                 }
 336                 *val = swab16(buf);
 337                 if (chan->type == IIO_PROXIMITY) {
 338                         /*
 339                          * Invert the proximity data so we return low values
 340                          * for close objects and high values for far ones.
 341                          */
 342                         regmap_field_read(data->reg_ps_gain, &index);
 343                         *val = stk3310_ps_max[index] - *val;
 344                 }
 345                 mutex_unlock(&data->lock);
 346                 return IIO_VAL_INT;
 347         case IIO_CHAN_INFO_INT_TIME:
 348                 if (chan->type == IIO_LIGHT)
 349                         regmap_field_read(data->reg_als_it, &index);
 350                 else
 351                         regmap_field_read(data->reg_ps_it, &index);
 352                 *val = stk3310_it_table[index][0];
 353                 *val2 = stk3310_it_table[index][1];
 354                 return IIO_VAL_INT_PLUS_MICRO;
 355         case IIO_CHAN_INFO_SCALE:
 356                 if (chan->type == IIO_LIGHT)
 357                         regmap_field_read(data->reg_als_gain, &index);
 358                 else
 359                         regmap_field_read(data->reg_ps_gain, &index);
 360                 *val = stk3310_scale_table[index][0];
 361                 *val2 = stk3310_scale_table[index][1];
 362                 return IIO_VAL_INT_PLUS_MICRO;
 363         }
 364
 365         return -EINVAL;
 366 }
 367
 368 static int stk3310_write_raw(struct iio_dev *indio_dev,
 369                              struct iio_chan_spec const *chan,
 370                              int val, int val2, long mask)
 371 {
 372         int ret;
 373         int index;
 374         struct stk3310_data *data = iio_priv(indio_dev);
 375
 376         switch (mask) {
 377         case IIO_CHAN_INFO_INT_TIME:
 378                 index = stk3310_get_index(stk3310_it_table,
 379                                           ARRAY_SIZE(stk3310_it_table),
 380                                           val, val2);
 381                 if (index < 0)
 382                         return -EINVAL;
 383                 mutex_lock(&data->lock);
 384                 if (chan->type == IIO_LIGHT)
 385                         ret = regmap_field_write(data->reg_als_it, index);
 386                 else
 387                         ret = regmap_field_write(data->reg_ps_it, index);
 388                 if (ret < 0)
 389                         dev_err(&data->client->dev,
 390                                         "sensor configuration failed\n");
 391                 mutex_unlock(&data->lock);
 392                 return ret;
 393
 394         case IIO_CHAN_INFO_SCALE:
 395                 index = stk3310_get_index(stk3310_scale_table,
 396                                           ARRAY_SIZE(stk3310_scale_table),
 397                                           val, val2);
 398                 if (index < 0)
 399                         return -EINVAL;
 400                 mutex_lock(&data->lock);
 401                 if (chan->type == IIO_LIGHT)
 402                         ret = regmap_field_write(data->reg_als_gain, index);
 403                 else
 404                         ret = regmap_field_write(data->reg_ps_gain, index);
 405                 if (ret < 0)
 406                         dev_err(&data->client->dev,
 407                                         "sensor configuration failed\n");
 408                 mutex_unlock(&data->lock);
 409                 return ret;
 410         }
 411
 412         return -EINVAL;
 413 }
 414
 415 static const struct iio_info stk3310_info = {
 416         .driver_module          = THIS_MODULE,
 417         .read_raw               = stk3310_read_raw,
 418         .write_raw              = stk3310_write_raw,
 419         .attrs                  = &stk3310_attribute_group,
 420         .read_event_value       = stk3310_read_event,
 421         .write_event_value      = stk3310_write_event,
 422         .read_event_config      = stk3310_read_event_config,
 423         .write_event_config     = stk3310_write_event_config,
 424 };
 425
 426 static int stk3310_set_state(struct stk3310_data *data, u8 state)
 427 {
 428         int ret;
 429         struct i2c_client *client = data->client;
 430
 431         /* 3-bit state; 0b100 is not supported. */
 432         if (state > 7 || state == 4)
 433                 return -EINVAL;
 434
 435         mutex_lock(&data->lock);
 436         ret = regmap_field_write(data->reg_state, state);
 437         if (ret < 0) {
 438                 dev_err(&client->dev, "failed to change sensor state\n");
 439         } else if (state != STK3310_STATE_STANDBY) {
 440                 /* Don't reset the 'enabled' flags if we're going in standby */
 441                 data->ps_enabled  = !!(state & 0x01);
 442                 data->als_enabled = !!(state & 0x02);
 443         }
 444         mutex_unlock(&data->lock);
 445
 446         return ret;
 447 }
 448
 449 static int stk3310_init(struct iio_dev *indio_dev)
 450 {
 451         int ret;
 452         int chipid;
 453         u8 state;
 454         struct stk3310_data *data = iio_priv(indio_dev);
 455         struct i2c_client *client = data->client;
 456
 457         regmap_read(data->regmap, STK3310_REG_ID, &chipid);
 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 int stk3310_gpio_probe(struct i2c_client *client)
 480 {
 481         struct device *dev;
 482         struct gpio_desc *gpio;
 483         int ret;
 484
 485         if (!client)
 486                 return -EINVAL;
 487
 488         dev = &client->dev;
 489
 490         /* gpio interrupt pin */
 491         gpio = devm_gpiod_get_index(dev, STK3310_GPIO, 0);
 492         if (IS_ERR(gpio)) {
 493                 dev_err(dev, "acpi gpio get index failed\n");
 494                 return PTR_ERR(gpio);
 495         }
 496
 497         ret = gpiod_direction_input(gpio);
 498         if (ret)
 499                 return ret;
 500
 501         ret = gpiod_to_irq(gpio);
 502         dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
 503
 504         return ret;
 505 }
 506
 507 static bool stk3310_is_volatile_reg(struct device *dev, unsigned int reg)
 508 {
 509         switch (reg) {
 510         case STK3310_REG_ALS_DATA_MSB:
 511         case STK3310_REG_ALS_DATA_LSB:
 512         case STK3310_REG_PS_DATA_LSB:
 513         case STK3310_REG_PS_DATA_MSB:
 514         case STK3310_REG_FLAG:
 515                 return true;
 516         default:
 517                 return false;
 518         }
 519 }
 520
 521 static struct regmap_config stk3310_regmap_config = {
 522         .name = STK3310_REGMAP_NAME,
 523         .reg_bits = 8,
 524         .val_bits = 8,
 525         .max_register = STK3310_MAX_REG,
 526         .cache_type = REGCACHE_RBTREE,
 527         .volatile_reg = stk3310_is_volatile_reg,
 528 };
 529
 530 static int stk3310_regmap_init(struct stk3310_data *data)
 531 {
 532         struct regmap *regmap;
 533         struct i2c_client *client;
 534
 535         client = data->client;
 536         regmap = devm_regmap_init_i2c(client, &stk3310_regmap_config);
 537         if (IS_ERR(regmap)) {
 538                 dev_err(&client->dev, "regmap initialization failed.\n");
 539                 return PTR_ERR(regmap);
 540         }
 541         data->regmap = regmap;
 542
 543         STK3310_REGFIELD(state);
 544         STK3310_REGFIELD(als_gain);
 545         STK3310_REGFIELD(ps_gain);
 546         STK3310_REGFIELD(als_it);
 547         STK3310_REGFIELD(ps_it);
 548         STK3310_REGFIELD(int_ps);
 549         STK3310_REGFIELD(flag_psint);
 550         STK3310_REGFIELD(flag_nf);
 551
 552         return 0;
 553 }
 554
 555 static irqreturn_t stk3310_irq_handler(int irq, void *private)
 556 {
 557         struct iio_dev *indio_dev = private;
 558         struct stk3310_data *data = iio_priv(indio_dev);
 559
 560         data->timestamp = iio_get_time_ns();
 561
 562         return IRQ_WAKE_THREAD;
 563 }
 564
 565 static irqreturn_t stk3310_irq_event_handler(int irq, void *private)
 566 {
 567         int ret;
 568         unsigned int dir;
 569         u64 event;
 570
 571         struct iio_dev *indio_dev = private;
 572         struct stk3310_data *data = iio_priv(indio_dev);
 573
 574         /* Read FLAG_NF to figure out what threshold has been met. */
 575         mutex_lock(&data->lock);
 576         ret = regmap_field_read(data->reg_flag_nf, &dir);
 577         if (ret < 0) {
 578                 dev_err(&data->client->dev, "register read failed\n");
 579                 mutex_unlock(&data->lock);
 580                 return ret;
 581         }
 582         event = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1,
 583                                      IIO_EV_TYPE_THRESH,
 584                                      (dir ? IIO_EV_DIR_RISING :
 585                                             IIO_EV_DIR_FALLING));
 586         iio_push_event(indio_dev, event, data->timestamp);
 587
 588         /* Reset the interrupt flag */
 589         ret = regmap_field_write(data->reg_flag_psint, 0);
 590         if (ret < 0)
 591                 dev_err(&data->client->dev, "failed to reset interrupts\n");
 592         mutex_unlock(&data->lock);
 593
 594         return IRQ_HANDLED;
 595 }
 596
 597 static int stk3310_probe(struct i2c_client *client,
 598                          const struct i2c_device_id *id)
 599 {
 600         int ret;
 601         struct iio_dev *indio_dev;
 602         struct stk3310_data *data;
 603
 604         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 605         if (!indio_dev) {
 606                 dev_err(&client->dev, "iio allocation failed!\n");
 607                 return -ENOMEM;
 608         }
 609
 610         data = iio_priv(indio_dev);
 611         data->client = client;
 612         i2c_set_clientdata(client, indio_dev);
 613         mutex_init(&data->lock);
 614
 615         ret = stk3310_regmap_init(data);
 616         if (ret < 0)
 617                 return ret;
 618
 619         indio_dev->dev.parent = &client->dev;
 620         indio_dev->info = &stk3310_info;
 621         indio_dev->name = STK3310_DRIVER_NAME;
 622         indio_dev->modes = INDIO_DIRECT_MODE;
 623         indio_dev->channels = stk3310_channels;
 624         indio_dev->num_channels = ARRAY_SIZE(stk3310_channels);
 625
 626         ret = stk3310_init(indio_dev);
 627         if (ret < 0)
 628                 return ret;
 629
 630         ret = iio_device_register(indio_dev);
 631         if (ret < 0) {
 632                 dev_err(&client->dev, "device_register failed\n");
 633                 stk3310_set_state(data, STK3310_STATE_STANDBY);
 634         }
 635
 636         if (client->irq <= 0)
 637                 client->irq = stk3310_gpio_probe(client);
 638
 639         if (client->irq >= 0) {
 640                 ret = devm_request_threaded_irq(&client->dev, client->irq,
 641                                                 stk3310_irq_handler,
 642                                                 stk3310_irq_event_handler,
 643                                                 IRQF_TRIGGER_FALLING |
 644                                                 IRQF_ONESHOT,
 645                                                 STK3310_EVENT, indio_dev);
 646                 if (ret < 0)
 647                         dev_err(&client->dev, "request irq %d failed\n",
 648                                         client->irq);
 649         }
 650
 651         return ret;
 652 }
 653
 654 static int stk3310_remove(struct i2c_client *client)
 655 {
 656         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 657
 658         iio_device_unregister(indio_dev);
 659         return stk3310_set_state(iio_priv(indio_dev), STK3310_STATE_STANDBY);
 660 }
 661
 662 #ifdef CONFIG_PM_SLEEP
 663 static int stk3310_suspend(struct device *dev)
 664 {
 665         struct stk3310_data *data;
 666
 667         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 668
 669         return stk3310_set_state(data, STK3310_STATE_STANDBY);
 670 }
 671
 672 static int stk3310_resume(struct device *dev)
 673 {
 674         int state = 0;
 675         struct stk3310_data *data;
 676
 677         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 678         if (data->ps_enabled)
 679                 state |= STK3310_STATE_EN_PS;
 680         if (data->als_enabled)
 681                 state |= STK3310_STATE_EN_ALS;
 682
 683         return stk3310_set_state(data, state);
 684 }
 685
 686 static SIMPLE_DEV_PM_OPS(stk3310_pm_ops, stk3310_suspend, stk3310_resume);
 687
 688 #define STK3310_PM_OPS (&stk3310_pm_ops)
 689 #else
 690 #define STK3310_PM_OPS NULL
 691 #endif
 692
 693 static const struct i2c_device_id stk3310_i2c_id[] = {
 694         {"STK3310", 0},
 695         {"STK3311", 0},
 696         {}
 697 };
 698
 699 static const struct acpi_device_id stk3310_acpi_id[] = {
 700         {"STK3310", 0},
 701         {"STK3311", 0},
 702         {}
 703 };
 704
 705 MODULE_DEVICE_TABLE(acpi, stk3310_acpi_id);
 706
 707 static struct i2c_driver stk3310_driver = {
 708         .driver = {
 709                 .name = "stk3310",
 710                 .pm = STK3310_PM_OPS,
 711                 .acpi_match_table = ACPI_PTR(stk3310_acpi_id),
 712         },
 713         .probe =            stk3310_probe,
 714         .remove =           stk3310_remove,
 715         .id_table =         stk3310_i2c_id,
 716 };
 717
 718 module_i2c_driver(stk3310_driver);
 719
 720 MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
 721 MODULE_DESCRIPTION("STK3310 Ambient Light and Proximity Sensor driver");
 722 MODULE_LICENSE("GPL v2");