drivers/iio/temperature/mlx90614.c

   1 /*
   2  * mlx90614.c - Support for Melexis MLX90614 contactless IR temperature sensor
   3  *
   4  * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
   5  * Copyright (c) 2015 Essensium NV
   6  * Copyright (c) 2015 Melexis
   7  *
   8  * This file is subject to the terms and conditions of version 2 of
   9  * the GNU General Public License.  See the file COPYING in the main
  10  * directory of this archive for more details.
  11  *
  12  * Driver for the Melexis MLX90614 I2C 16-bit IR thermopile sensor
  13  *
  14  * (7-bit I2C slave address 0x5a, 100KHz bus speed only!)
  15  *
  16  * To wake up from sleep mode, the SDA line must be held low while SCL is high
  17  * for at least 33ms.  This is achieved with an extra GPIO that can be connected
  18  * directly to the SDA line.  In normal operation, the GPIO is set as input and
  19  * will not interfere in I2C communication.  While the GPIO is driven low, the
  20  * i2c adapter is locked since it cannot be used by other clients.  The SCL line
  21  * always has a pull-up so we do not need an extra GPIO to drive it high.  If
  22  * the "wakeup" GPIO is not given, power management will be disabled.
  23  *
  24  */
  25
  26 #include <linux/err.h>
  27 #include <linux/i2c.h>
  28 #include <linux/module.h>
  29 #include <linux/delay.h>
  30 #include <linux/jiffies.h>
  31 #include <linux/gpio/consumer.h>
  32 #include <linux/pm_runtime.h>
  33
  34 #include <linux/iio/iio.h>
  35 #include <linux/iio/sysfs.h>
  36
  37 #define MLX90614_OP_RAM         0x00
  38 #define MLX90614_OP_EEPROM      0x20
  39 #define MLX90614_OP_SLEEP       0xff
  40
  41 /* RAM offsets with 16-bit data, MSB first */
  42 #define MLX90614_RAW1   (MLX90614_OP_RAM | 0x04) /* raw data IR channel 1 */
  43 #define MLX90614_RAW2   (MLX90614_OP_RAM | 0x05) /* raw data IR channel 2 */
  44 #define MLX90614_TA     (MLX90614_OP_RAM | 0x06) /* ambient temperature */
  45 #define MLX90614_TOBJ1  (MLX90614_OP_RAM | 0x07) /* object 1 temperature */
  46 #define MLX90614_TOBJ2  (MLX90614_OP_RAM | 0x08) /* object 2 temperature */
  47
  48 /* EEPROM offsets with 16-bit data, MSB first */
  49 #define MLX90614_EMISSIVITY     (MLX90614_OP_EEPROM | 0x04) /* emissivity correction coefficient */
  50 #define MLX90614_CONFIG         (MLX90614_OP_EEPROM | 0x05) /* configuration register */
  51
  52 /* Control bits in configuration register */
  53 #define MLX90614_CONFIG_IIR_SHIFT 0 /* IIR coefficient */
  54 #define MLX90614_CONFIG_IIR_MASK (0x7 << MLX90614_CONFIG_IIR_SHIFT)
  55 #define MLX90614_CONFIG_DUAL_SHIFT 6 /* single (0) or dual (1) IR sensor */
  56 #define MLX90614_CONFIG_DUAL_MASK (1 << MLX90614_CONFIG_DUAL_SHIFT)
  57 #define MLX90614_CONFIG_FIR_SHIFT 8 /* FIR coefficient */
  58 #define MLX90614_CONFIG_FIR_MASK (0x7 << MLX90614_CONFIG_FIR_SHIFT)
  59 #define MLX90614_CONFIG_GAIN_SHIFT 11 /* gain */
  60 #define MLX90614_CONFIG_GAIN_MASK (0x7 << MLX90614_CONFIG_GAIN_SHIFT)
  61
  62 /* Timings (in ms) */
  63 #define MLX90614_TIMING_EEPROM 20 /* time for EEPROM write/erase to complete */
  64 #define MLX90614_TIMING_WAKEUP 34 /* time to hold SDA low for wake-up */
  65 #define MLX90614_TIMING_STARTUP 250 /* time before first data after wake-up */
  66
  67 #define MLX90614_AUTOSLEEP_DELAY 5000 /* default autosleep delay */
  68
  69 /* Magic constants */
  70 #define MLX90614_CONST_OFFSET_DEC -13657 /* decimal part of the Kelvin offset */
  71 #define MLX90614_CONST_OFFSET_REM 500000 /* remainder of offset (273.15*50) */
  72 #define MLX90614_CONST_SCALE 20 /* Scale in milliKelvin (0.02 * 1000) */
  73 #define MLX90614_CONST_RAW_EMISSIVITY_MAX 65535 /* max value for emissivity */
  74 #define MLX90614_CONST_EMISSIVITY_RESOLUTION 15259 /* 1/65535 ~ 0.000015259 */
  75
  76 struct mlx90614_data {
  77         struct i2c_client *client;
  78         struct mutex lock; /* for EEPROM access only */
  79         struct gpio_desc *wakeup_gpio; /* NULL to disable sleep/wake-up */
  80         unsigned long ready_timestamp; /* in jiffies */
  81 };
  82
  83 /* Bandwidth values for IIR filtering */
  84 static const int mlx90614_iir_values[] = {77, 31, 20, 15, 723, 153, 110, 86};
  85 static IIO_CONST_ATTR(in_temp_object_filter_low_pass_3db_frequency_available,
  86                       "0.15 0.20 0.31 0.77 0.86 1.10 1.53 7.23");
  87
  88 static struct attribute *mlx90614_attributes[] = {
  89         &iio_const_attr_in_temp_object_filter_low_pass_3db_frequency_available.dev_attr.attr,
  90         NULL,
  91 };
  92
  93 static const struct attribute_group mlx90614_attr_group = {
  94         .attrs = mlx90614_attributes,
  95 };
  96
  97 /*
  98  * Erase an address and write word.
  99  * The mutex must be locked before calling.
 100  */
 101 static s32 mlx90614_write_word(const struct i2c_client *client, u8 command,
 102                                u16 value)
 103 {
 104         /*
 105          * Note: The mlx90614 requires a PEC on writing but does not send us a
 106          * valid PEC on reading.  Hence, we cannot set I2C_CLIENT_PEC in
 107          * i2c_client.flags.  As a workaround, we use i2c_smbus_xfer here.
 108          */
 109         union i2c_smbus_data data;
 110         s32 ret;
 111
 112         dev_dbg(&client->dev, "Writing 0x%x to address 0x%x", value, command);
 113
 114         data.word = 0x0000; /* erase command */
 115         ret = i2c_smbus_xfer(client->adapter, client->addr,
 116                              client->flags | I2C_CLIENT_PEC,
 117                              I2C_SMBUS_WRITE, command,
 118                              I2C_SMBUS_WORD_DATA, &data);
 119         if (ret < 0)
 120                 return ret;
 121
 122         msleep(MLX90614_TIMING_EEPROM);
 123
 124         data.word = value; /* actual write */
 125         ret = i2c_smbus_xfer(client->adapter, client->addr,
 126                              client->flags | I2C_CLIENT_PEC,
 127                              I2C_SMBUS_WRITE, command,
 128                              I2C_SMBUS_WORD_DATA, &data);
 129
 130         msleep(MLX90614_TIMING_EEPROM);
 131
 132         return ret;
 133 }
 134
 135 /*
 136  * Find the IIR value inside mlx90614_iir_values array and return its position
 137  * which is equivalent to the bit value in sensor register
 138  */
 139 static inline s32 mlx90614_iir_search(const struct i2c_client *client,
 140                                       int value)
 141 {
 142         int i;
 143         s32 ret;
 144
 145         for (i = 0; i < ARRAY_SIZE(mlx90614_iir_values); ++i) {
 146                 if (value == mlx90614_iir_values[i])
 147                         break;
 148         }
 149
 150         if (i == ARRAY_SIZE(mlx90614_iir_values))
 151                 return -EINVAL;
 152
 153         /*
 154          * CONFIG register values must not be changed so
 155          * we must read them before we actually write
 156          * changes
 157          */
 158         ret = i2c_smbus_read_word_data(client, MLX90614_CONFIG);
 159         if (ret > 0)
 160                 return ret;
 161
 162         /* Write changed values */
 163         ret = mlx90614_write_word(client, MLX90614_CONFIG,
 164                         (i << MLX90614_CONFIG_IIR_SHIFT) |
 165                         (((u16) ((0x7 << MLX90614_CONFIG_FIR_SHIFT) |
 166                         ((u16) ret & (~((u16) MLX90614_CONFIG_FIR_MASK))))) &
 167                         (~(u16) MLX90614_CONFIG_IIR_MASK)));
 168         return ret;
 169 }
 170
 171 #ifdef CONFIG_PM
 172 /*
 173  * If @startup is true, make sure MLX90614_TIMING_STARTUP ms have elapsed since
 174  * the last wake-up.  This is normally only needed to get a valid temperature
 175  * reading.  EEPROM access does not need such delay.
 176  * Return 0 on success, <0 on error.
 177  */
 178 static int mlx90614_power_get(struct mlx90614_data *data, bool startup)
 179 {
 180         unsigned long now;
 181
 182         if (!data->wakeup_gpio)
 183                 return 0;
 184
 185         pm_runtime_get_sync(&data->client->dev);
 186
 187         if (startup) {
 188                 now = jiffies;
 189                 if (time_before(now, data->ready_timestamp) &&
 190                     msleep_interruptible(jiffies_to_msecs(
 191                                 data->ready_timestamp - now)) != 0) {
 192                         pm_runtime_put_autosuspend(&data->client->dev);
 193                         return -EINTR;
 194                 }
 195         }
 196
 197         return 0;
 198 }
 199
 200 static void mlx90614_power_put(struct mlx90614_data *data)
 201 {
 202         if (!data->wakeup_gpio)
 203                 return;
 204
 205         pm_runtime_mark_last_busy(&data->client->dev);
 206         pm_runtime_put_autosuspend(&data->client->dev);
 207 }
 208 #else
 209 static inline int mlx90614_power_get(struct mlx90614_data *data, bool startup)
 210 {
 211         return 0;
 212 }
 213
 214 static inline void mlx90614_power_put(struct mlx90614_data *data)
 215 {
 216 }
 217 #endif
 218
 219 static int mlx90614_read_raw(struct iio_dev *indio_dev,
 220                             struct iio_chan_spec const *channel, int *val,
 221                             int *val2, long mask)
 222 {
 223         struct mlx90614_data *data = iio_priv(indio_dev);
 224         u8 cmd;
 225         s32 ret;
 226
 227         switch (mask) {
 228         case IIO_CHAN_INFO_RAW: /* 0.02K / LSB */
 229                 switch (channel->channel2) {
 230                 case IIO_MOD_TEMP_AMBIENT:
 231                         cmd = MLX90614_TA;
 232                         break;
 233                 case IIO_MOD_TEMP_OBJECT:
 234                         switch (channel->channel) {
 235                         case 0:
 236                                 cmd = MLX90614_TOBJ1;
 237                                 break;
 238                         case 1:
 239                                 cmd = MLX90614_TOBJ2;
 240                                 break;
 241                         default:
 242                                 return -EINVAL;
 243                         }
 244                         break;
 245                 default:
 246                         return -EINVAL;
 247                 }
 248
 249                 ret = mlx90614_power_get(data, true);
 250                 if (ret < 0)
 251                         return ret;
 252                 ret = i2c_smbus_read_word_data(data->client, cmd);
 253                 mlx90614_power_put(data);
 254
 255                 if (ret < 0)
 256                         return ret;
 257
 258                 /* MSB is an error flag */
 259                 if (ret & 0x8000)
 260                         return -EIO;
 261
 262                 *val = ret;
 263                 return IIO_VAL_INT;
 264         case IIO_CHAN_INFO_OFFSET:
 265                 *val = MLX90614_CONST_OFFSET_DEC;
 266                 *val2 = MLX90614_CONST_OFFSET_REM;
 267                 return IIO_VAL_INT_PLUS_MICRO;
 268         case IIO_CHAN_INFO_SCALE:
 269                 *val = MLX90614_CONST_SCALE;
 270                 return IIO_VAL_INT;
 271         case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/65535 / LSB */
 272                 mlx90614_power_get(data, false);
 273                 mutex_lock(&data->lock);
 274                 ret = i2c_smbus_read_word_data(data->client,
 275                                                MLX90614_EMISSIVITY);
 276                 mutex_unlock(&data->lock);
 277                 mlx90614_power_put(data);
 278
 279                 if (ret < 0)
 280                         return ret;
 281
 282                 if (ret == MLX90614_CONST_RAW_EMISSIVITY_MAX) {
 283                         *val = 1;
 284                         *val2 = 0;
 285                 } else {
 286                         *val = 0;
 287                         *val2 = ret * MLX90614_CONST_EMISSIVITY_RESOLUTION;
 288                 }
 289                 return IIO_VAL_INT_PLUS_NANO;
 290         case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR setting with
 291                                                              FIR = 1024 */
 292                 mlx90614_power_get(data, false);
 293                 mutex_lock(&data->lock);
 294                 ret = i2c_smbus_read_word_data(data->client, MLX90614_CONFIG);
 295                 mutex_unlock(&data->lock);
 296                 mlx90614_power_put(data);
 297
 298                 if (ret < 0)
 299                         return ret;
 300
 301                 *val = mlx90614_iir_values[ret & MLX90614_CONFIG_IIR_MASK] / 100;
 302                 *val2 = (mlx90614_iir_values[ret & MLX90614_CONFIG_IIR_MASK] % 100) *
 303                         10000;
 304                 return IIO_VAL_INT_PLUS_MICRO;
 305         default:
 306                 return -EINVAL;
 307         }
 308 }
 309
 310 static int mlx90614_write_raw(struct iio_dev *indio_dev,
 311                              struct iio_chan_spec const *channel, int val,
 312                              int val2, long mask)
 313 {
 314         struct mlx90614_data *data = iio_priv(indio_dev);
 315         s32 ret;
 316
 317         switch (mask) {
 318         case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/65535 / LSB */
 319                 if (val < 0 || val2 < 0 || val > 1 || (val == 1 && val2 != 0))
 320                         return -EINVAL;
 321                 val = val * MLX90614_CONST_RAW_EMISSIVITY_MAX +
 322                         val2 / MLX90614_CONST_EMISSIVITY_RESOLUTION;
 323
 324                 mlx90614_power_get(data, false);
 325                 mutex_lock(&data->lock);
 326                 ret = mlx90614_write_word(data->client, MLX90614_EMISSIVITY,
 327                                           val);
 328                 mutex_unlock(&data->lock);
 329                 mlx90614_power_put(data);
 330
 331                 return ret;
 332         case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR Filter setting */
 333                 if (val < 0 || val2 < 0)
 334                         return -EINVAL;
 335
 336                 mlx90614_power_get(data, false);
 337                 mutex_lock(&data->lock);
 338                 ret = mlx90614_iir_search(data->client,
 339                                           val * 100 + val2 / 10000);
 340                 mutex_unlock(&data->lock);
 341                 mlx90614_power_put(data);
 342
 343                 return ret;
 344         default:
 345                 return -EINVAL;
 346         }
 347 }
 348
 349 static int mlx90614_write_raw_get_fmt(struct iio_dev *indio_dev,
 350                                      struct iio_chan_spec const *channel,
 351                                      long mask)
 352 {
 353         switch (mask) {
 354         case IIO_CHAN_INFO_CALIBEMISSIVITY:
 355                 return IIO_VAL_INT_PLUS_NANO;
 356         case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
 357                 return IIO_VAL_INT_PLUS_MICRO;
 358         default:
 359                 return -EINVAL;
 360         }
 361 }
 362
 363 static const struct iio_chan_spec mlx90614_channels[] = {
 364         {
 365                 .type = IIO_TEMP,
 366                 .modified = 1,
 367                 .channel2 = IIO_MOD_TEMP_AMBIENT,
 368                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 369                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
 370                     BIT(IIO_CHAN_INFO_SCALE),
 371         },
 372         {
 373                 .type = IIO_TEMP,
 374                 .modified = 1,
 375                 .channel2 = IIO_MOD_TEMP_OBJECT,
 376                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 377                     BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) |
 378                         BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
 379                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
 380                     BIT(IIO_CHAN_INFO_SCALE),
 381         },
 382         {
 383                 .type = IIO_TEMP,
 384                 .indexed = 1,
 385                 .modified = 1,
 386                 .channel = 1,
 387                 .channel2 = IIO_MOD_TEMP_OBJECT,
 388                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 389                     BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) |
 390                         BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
 391                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
 392                     BIT(IIO_CHAN_INFO_SCALE),
 393         },
 394 };
 395
 396 static const struct iio_info mlx90614_info = {
 397         .read_raw = mlx90614_read_raw,
 398         .write_raw = mlx90614_write_raw,
 399         .write_raw_get_fmt = mlx90614_write_raw_get_fmt,
 400         .attrs = &mlx90614_attr_group,
 401         .driver_module = THIS_MODULE,
 402 };
 403
 404 #ifdef CONFIG_PM
 405 static int mlx90614_sleep(struct mlx90614_data *data)
 406 {
 407         s32 ret;
 408
 409         if (!data->wakeup_gpio) {
 410                 dev_dbg(&data->client->dev, "Sleep disabled");
 411                 return -ENOSYS;
 412         }
 413
 414         dev_dbg(&data->client->dev, "Requesting sleep");
 415
 416         mutex_lock(&data->lock);
 417         ret = i2c_smbus_xfer(data->client->adapter, data->client->addr,
 418                              data->client->flags | I2C_CLIENT_PEC,
 419                              I2C_SMBUS_WRITE, MLX90614_OP_SLEEP,
 420                              I2C_SMBUS_BYTE, NULL);
 421         mutex_unlock(&data->lock);
 422
 423         return ret;
 424 }
 425
 426 static int mlx90614_wakeup(struct mlx90614_data *data)
 427 {
 428         if (!data->wakeup_gpio) {
 429                 dev_dbg(&data->client->dev, "Wake-up disabled");
 430                 return -ENOSYS;
 431         }
 432
 433         dev_dbg(&data->client->dev, "Requesting wake-up");
 434
 435         i2c_lock_adapter(data->client->adapter);
 436         gpiod_direction_output(data->wakeup_gpio, 0);
 437         msleep(MLX90614_TIMING_WAKEUP);
 438         gpiod_direction_input(data->wakeup_gpio);
 439         i2c_unlock_adapter(data->client->adapter);
 440
 441         data->ready_timestamp = jiffies +
 442                         msecs_to_jiffies(MLX90614_TIMING_STARTUP);
 443
 444         /*
 445          * Quirk: the i2c controller may get confused right after the
 446          * wake-up signal has been sent.  As a workaround, do a dummy read.
 447          * If the read fails, the controller will probably be reset so that
 448          * further reads will work.
 449          */
 450         i2c_smbus_read_word_data(data->client, MLX90614_CONFIG);
 451
 452         return 0;
 453 }
 454
 455 /* Return wake-up GPIO or NULL if sleep functionality should be disabled. */
 456 static struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client)
 457 {
 458         struct gpio_desc *gpio;
 459
 460         if (!i2c_check_functionality(client->adapter,
 461                                                 I2C_FUNC_SMBUS_WRITE_BYTE)) {
 462                 dev_info(&client->dev,
 463                          "i2c adapter does not support SMBUS_WRITE_BYTE, sleep disabled");
 464                 return NULL;
 465         }
 466
 467         gpio = devm_gpiod_get_optional(&client->dev, "wakeup", GPIOD_IN);
 468
 469         if (IS_ERR(gpio)) {
 470                 dev_warn(&client->dev,
 471                          "gpio acquisition failed with error %ld, sleep disabled",
 472                          PTR_ERR(gpio));
 473                 return NULL;
 474         } else if (!gpio) {
 475                 dev_info(&client->dev,
 476                          "wakeup-gpio not found, sleep disabled");
 477         }
 478
 479         return gpio;
 480 }
 481 #else
 482 static inline int mlx90614_sleep(struct mlx90614_data *data)
 483 {
 484         return -ENOSYS;
 485 }
 486 static inline int mlx90614_wakeup(struct mlx90614_data *data)
 487 {
 488         return -ENOSYS;
 489 }
 490 static inline struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client)
 491 {
 492         return NULL;
 493 }
 494 #endif
 495
 496 /* Return 0 for single sensor, 1 for dual sensor, <0 on error. */
 497 static int mlx90614_probe_num_ir_sensors(struct i2c_client *client)
 498 {
 499         s32 ret;
 500
 501         ret = i2c_smbus_read_word_data(client, MLX90614_CONFIG);
 502
 503         if (ret < 0)
 504                 return ret;
 505
 506         return (ret & MLX90614_CONFIG_DUAL_MASK) ? 1 : 0;
 507 }
 508
 509 static int mlx90614_probe(struct i2c_client *client,
 510                          const struct i2c_device_id *id)
 511 {
 512         struct iio_dev *indio_dev;
 513         struct mlx90614_data *data;
 514         int ret;
 515
 516         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
 517                 return -ENODEV;
 518
 519         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 520         if (!indio_dev)
 521                 return -ENOMEM;
 522
 523         data = iio_priv(indio_dev);
 524         i2c_set_clientdata(client, indio_dev);
 525         data->client = client;
 526         mutex_init(&data->lock);
 527         data->wakeup_gpio = mlx90614_probe_wakeup(client);
 528
 529         mlx90614_wakeup(data);
 530
 531         indio_dev->dev.parent = &client->dev;
 532         indio_dev->name = id->name;
 533         indio_dev->modes = INDIO_DIRECT_MODE;
 534         indio_dev->info = &mlx90614_info;
 535
 536         ret = mlx90614_probe_num_ir_sensors(client);
 537         switch (ret) {
 538         case 0:
 539                 dev_dbg(&client->dev, "Found single sensor");
 540                 indio_dev->channels = mlx90614_channels;
 541                 indio_dev->num_channels = 2;
 542                 break;
 543         case 1:
 544                 dev_dbg(&client->dev, "Found dual sensor");
 545                 indio_dev->channels = mlx90614_channels;
 546                 indio_dev->num_channels = 3;
 547                 break;
 548         default:
 549                 return ret;
 550         }
 551
 552         if (data->wakeup_gpio) {
 553                 pm_runtime_set_autosuspend_delay(&client->dev,
 554                                                  MLX90614_AUTOSLEEP_DELAY);
 555                 pm_runtime_use_autosuspend(&client->dev);
 556                 pm_runtime_set_active(&client->dev);
 557                 pm_runtime_enable(&client->dev);
 558         }
 559
 560         return iio_device_register(indio_dev);
 561 }
 562
 563 static int mlx90614_remove(struct i2c_client *client)
 564 {
 565         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 566         struct mlx90614_data *data = iio_priv(indio_dev);
 567
 568         iio_device_unregister(indio_dev);
 569
 570         if (data->wakeup_gpio) {
 571                 pm_runtime_disable(&client->dev);
 572                 if (!pm_runtime_status_suspended(&client->dev))
 573                         mlx90614_sleep(data);
 574                 pm_runtime_set_suspended(&client->dev);
 575         }
 576
 577         return 0;
 578 }
 579
 580 static const struct i2c_device_id mlx90614_id[] = {
 581         { "mlx90614", 0 },
 582         { }
 583 };
 584 MODULE_DEVICE_TABLE(i2c, mlx90614_id);
 585
 586 #ifdef CONFIG_PM_SLEEP
 587 static int mlx90614_pm_suspend(struct device *dev)
 588 {
 589         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 590         struct mlx90614_data *data = iio_priv(indio_dev);
 591
 592         if (data->wakeup_gpio && pm_runtime_active(dev))
 593                 return mlx90614_sleep(data);
 594
 595         return 0;
 596 }
 597
 598 static int mlx90614_pm_resume(struct device *dev)
 599 {
 600         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 601         struct mlx90614_data *data = iio_priv(indio_dev);
 602         int err;
 603
 604         if (data->wakeup_gpio) {
 605                 err = mlx90614_wakeup(data);
 606                 if (err < 0)
 607                         return err;
 608
 609                 pm_runtime_disable(dev);
 610                 pm_runtime_set_active(dev);
 611                 pm_runtime_enable(dev);
 612         }
 613
 614         return 0;
 615 }
 616 #endif
 617
 618 #ifdef CONFIG_PM
 619 static int mlx90614_pm_runtime_suspend(struct device *dev)
 620 {
 621         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 622         struct mlx90614_data *data = iio_priv(indio_dev);
 623
 624         return mlx90614_sleep(data);
 625 }
 626
 627 static int mlx90614_pm_runtime_resume(struct device *dev)
 628 {
 629         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 630         struct mlx90614_data *data = iio_priv(indio_dev);
 631
 632         return mlx90614_wakeup(data);
 633 }
 634 #endif
 635
 636 static const struct dev_pm_ops mlx90614_pm_ops = {
 637         SET_SYSTEM_SLEEP_PM_OPS(mlx90614_pm_suspend, mlx90614_pm_resume)
 638         SET_RUNTIME_PM_OPS(mlx90614_pm_runtime_suspend,
 639                            mlx90614_pm_runtime_resume, NULL)
 640 };
 641
 642 static struct i2c_driver mlx90614_driver = {
 643         .driver = {
 644                 .name   = "mlx90614",
 645                 .pm     = &mlx90614_pm_ops,
 646         },
 647         .probe = mlx90614_probe,
 648         .remove = mlx90614_remove,
 649         .id_table = mlx90614_id,
 650 };
 651 module_i2c_driver(mlx90614_driver);
 652
 653 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
 654 MODULE_AUTHOR("Vianney le Clément de Saint-Marcq <vianney.leclement@essensium.com>");
 655 MODULE_AUTHOR("Crt Mori <cmo@melexis.com>");
 656 MODULE_DESCRIPTION("Melexis MLX90614 contactless IR temperature sensor driver");
 657 MODULE_LICENSE("GPL");