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 #define MLX90614_CONST_FIR 0x7 /* Fixed value for FIR part of low pass filter */
  76
  77 struct mlx90614_data {
  78         struct i2c_client *client;
  79         struct mutex lock; /* for EEPROM access only */
  80         struct gpio_desc *wakeup_gpio; /* NULL to disable sleep/wake-up */
  81         unsigned long ready_timestamp; /* in jiffies */
  82 };
  83
  84 /* Bandwidth values for IIR filtering */
  85 static const int mlx90614_iir_values[] = {77, 31, 20, 15, 723, 153, 110, 86};
  86 static IIO_CONST_ATTR(in_temp_object_filter_low_pass_3db_frequency_available,
  87                       "0.15 0.20 0.31 0.77 0.86 1.10 1.53 7.23");
  88
  89 static struct attribute *mlx90614_attributes[] = {
  90         &iio_const_attr_in_temp_object_filter_low_pass_3db_frequency_available.dev_attr.attr,
  91         NULL,
  92 };
  93
  94 static const struct attribute_group mlx90614_attr_group = {
  95         .attrs = mlx90614_attributes,
  96 };
  97
  98 /*
  99  * Erase an address and write word.
 100  * The mutex must be locked before calling.
 101  */
 102 static s32 mlx90614_write_word(const struct i2c_client *client, u8 command,
 103                                u16 value)
 104 {
 105         /*
 106          * Note: The mlx90614 requires a PEC on writing but does not send us a
 107          * valid PEC on reading.  Hence, we cannot set I2C_CLIENT_PEC in
 108          * i2c_client.flags.  As a workaround, we use i2c_smbus_xfer here.
 109          */
 110         union i2c_smbus_data data;
 111         s32 ret;
 112
 113         dev_dbg(&client->dev, "Writing 0x%x to address 0x%x", value, command);
 114
 115         data.word = 0x0000; /* erase command */
 116         ret = i2c_smbus_xfer(client->adapter, client->addr,
 117                              client->flags | I2C_CLIENT_PEC,
 118                              I2C_SMBUS_WRITE, command,
 119                              I2C_SMBUS_WORD_DATA, &data);
 120         if (ret < 0)
 121                 return ret;
 122
 123         msleep(MLX90614_TIMING_EEPROM);
 124
 125         data.word = value; /* actual write */
 126         ret = i2c_smbus_xfer(client->adapter, client->addr,
 127                              client->flags | I2C_CLIENT_PEC,
 128                              I2C_SMBUS_WRITE, command,
 129                              I2C_SMBUS_WORD_DATA, &data);
 130
 131         msleep(MLX90614_TIMING_EEPROM);
 132
 133         return ret;
 134 }
 135
 136 /*
 137  * Find the IIR value inside mlx90614_iir_values array and return its position
 138  * which is equivalent to the bit value in sensor register
 139  */
 140 static inline s32 mlx90614_iir_search(const struct i2c_client *client,
 141                                       int value)
 142 {
 143         int i;
 144         s32 ret;
 145
 146         for (i = 0; i < ARRAY_SIZE(mlx90614_iir_values); ++i) {
 147                 if (value == mlx90614_iir_values[i])
 148                         break;
 149         }
 150
 151         if (i == ARRAY_SIZE(mlx90614_iir_values))
 152                 return -EINVAL;
 153
 154         /*
 155          * CONFIG register values must not be changed so
 156          * we must read them before we actually write
 157          * changes
 158          */
 159         ret = i2c_smbus_read_word_data(client, MLX90614_CONFIG);
 160         if (ret < 0)
 161                 return ret;
 162
 163         ret &= ~MLX90614_CONFIG_FIR_MASK;
 164         ret |= MLX90614_CONST_FIR << MLX90614_CONFIG_FIR_SHIFT;
 165         ret &= ~MLX90614_CONFIG_IIR_MASK;
 166         ret |= i << MLX90614_CONFIG_IIR_SHIFT;
 167
 168         /* Write changed values */
 169         ret = mlx90614_write_word(client, MLX90614_CONFIG, ret);
 170         return ret;
 171 }
 172
 173 #ifdef CONFIG_PM
 174 /*
 175  * If @startup is true, make sure MLX90614_TIMING_STARTUP ms have elapsed since
 176  * the last wake-up.  This is normally only needed to get a valid temperature
 177  * reading.  EEPROM access does not need such delay.
 178  * Return 0 on success, <0 on error.
 179  */
 180 static int mlx90614_power_get(struct mlx90614_data *data, bool startup)
 181 {
 182         unsigned long now;
 183
 184         if (!data->wakeup_gpio)
 185                 return 0;
 186
 187         pm_runtime_get_sync(&data->client->dev);
 188
 189         if (startup) {
 190                 now = jiffies;
 191                 if (time_before(now, data->ready_timestamp) &&
 192                     msleep_interruptible(jiffies_to_msecs(
 193                                 data->ready_timestamp - now)) != 0) {
 194                         pm_runtime_put_autosuspend(&data->client->dev);
 195                         return -EINTR;
 196                 }
 197         }
 198
 199         return 0;
 200 }
 201
 202 static void mlx90614_power_put(struct mlx90614_data *data)
 203 {
 204         if (!data->wakeup_gpio)
 205                 return;
 206
 207         pm_runtime_mark_last_busy(&data->client->dev);
 208         pm_runtime_put_autosuspend(&data->client->dev);
 209 }
 210 #else
 211 static inline int mlx90614_power_get(struct mlx90614_data *data, bool startup)
 212 {
 213         return 0;
 214 }
 215
 216 static inline void mlx90614_power_put(struct mlx90614_data *data)
 217 {
 218 }
 219 #endif
 220
 221 static int mlx90614_read_raw(struct iio_dev *indio_dev,
 222                             struct iio_chan_spec const *channel, int *val,
 223                             int *val2, long mask)
 224 {
 225         struct mlx90614_data *data = iio_priv(indio_dev);
 226         u8 cmd;
 227         s32 ret;
 228
 229         switch (mask) {
 230         case IIO_CHAN_INFO_RAW: /* 0.02K / LSB */
 231                 switch (channel->channel2) {
 232                 case IIO_MOD_TEMP_AMBIENT:
 233                         cmd = MLX90614_TA;
 234                         break;
 235                 case IIO_MOD_TEMP_OBJECT:
 236                         switch (channel->channel) {
 237                         case 0:
 238                                 cmd = MLX90614_TOBJ1;
 239                                 break;
 240                         case 1:
 241                                 cmd = MLX90614_TOBJ2;
 242                                 break;
 243                         default:
 244                                 return -EINVAL;
 245                         }
 246                         break;
 247                 default:
 248                         return -EINVAL;
 249                 }
 250
 251                 ret = mlx90614_power_get(data, true);
 252                 if (ret < 0)
 253                         return ret;
 254                 ret = i2c_smbus_read_word_data(data->client, cmd);
 255                 mlx90614_power_put(data);
 256
 257                 if (ret < 0)
 258                         return ret;
 259
 260                 /* MSB is an error flag */
 261                 if (ret & 0x8000)
 262                         return -EIO;
 263
 264                 *val = ret;
 265                 return IIO_VAL_INT;
 266         case IIO_CHAN_INFO_OFFSET:
 267                 *val = MLX90614_CONST_OFFSET_DEC;
 268                 *val2 = MLX90614_CONST_OFFSET_REM;
 269                 return IIO_VAL_INT_PLUS_MICRO;
 270         case IIO_CHAN_INFO_SCALE:
 271                 *val = MLX90614_CONST_SCALE;
 272                 return IIO_VAL_INT;
 273         case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/65535 / LSB */
 274                 mlx90614_power_get(data, false);
 275                 mutex_lock(&data->lock);
 276                 ret = i2c_smbus_read_word_data(data->client,
 277                                                MLX90614_EMISSIVITY);
 278                 mutex_unlock(&data->lock);
 279                 mlx90614_power_put(data);
 280
 281                 if (ret < 0)
 282                         return ret;
 283
 284                 if (ret == MLX90614_CONST_RAW_EMISSIVITY_MAX) {
 285                         *val = 1;
 286                         *val2 = 0;
 287                 } else {
 288                         *val = 0;
 289                         *val2 = ret * MLX90614_CONST_EMISSIVITY_RESOLUTION;
 290                 }
 291                 return IIO_VAL_INT_PLUS_NANO;
 292         case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR setting with
 293                                                              FIR = 1024 */
 294                 mlx90614_power_get(data, false);
 295                 mutex_lock(&data->lock);
 296                 ret = i2c_smbus_read_word_data(data->client, MLX90614_CONFIG);
 297                 mutex_unlock(&data->lock);
 298                 mlx90614_power_put(data);
 299
 300                 if (ret < 0)
 301                         return ret;
 302
 303                 *val = mlx90614_iir_values[ret & MLX90614_CONFIG_IIR_MASK] / 100;
 304                 *val2 = (mlx90614_iir_values[ret & MLX90614_CONFIG_IIR_MASK] % 100) *
 305                         10000;
 306                 return IIO_VAL_INT_PLUS_MICRO;
 307         default:
 308                 return -EINVAL;
 309         }
 310 }
 311
 312 static int mlx90614_write_raw(struct iio_dev *indio_dev,
 313                              struct iio_chan_spec const *channel, int val,
 314                              int val2, long mask)
 315 {
 316         struct mlx90614_data *data = iio_priv(indio_dev);
 317         s32 ret;
 318
 319         switch (mask) {
 320         case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/65535 / LSB */
 321                 if (val < 0 || val2 < 0 || val > 1 || (val == 1 && val2 != 0))
 322                         return -EINVAL;
 323                 val = val * MLX90614_CONST_RAW_EMISSIVITY_MAX +
 324                         val2 / MLX90614_CONST_EMISSIVITY_RESOLUTION;
 325
 326                 mlx90614_power_get(data, false);
 327                 mutex_lock(&data->lock);
 328                 ret = mlx90614_write_word(data->client, MLX90614_EMISSIVITY,
 329                                           val);
 330                 mutex_unlock(&data->lock);
 331                 mlx90614_power_put(data);
 332
 333                 return ret;
 334         case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR Filter setting */
 335                 if (val < 0 || val2 < 0)
 336                         return -EINVAL;
 337
 338                 mlx90614_power_get(data, false);
 339                 mutex_lock(&data->lock);
 340                 ret = mlx90614_iir_search(data->client,
 341                                           val * 100 + val2 / 10000);
 342                 mutex_unlock(&data->lock);
 343                 mlx90614_power_put(data);
 344
 345                 return ret;
 346         default:
 347                 return -EINVAL;
 348         }
 349 }
 350
 351 static int mlx90614_write_raw_get_fmt(struct iio_dev *indio_dev,
 352                                      struct iio_chan_spec const *channel,
 353                                      long mask)
 354 {
 355         switch (mask) {
 356         case IIO_CHAN_INFO_CALIBEMISSIVITY:
 357                 return IIO_VAL_INT_PLUS_NANO;
 358         case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
 359                 return IIO_VAL_INT_PLUS_MICRO;
 360         default:
 361                 return -EINVAL;
 362         }
 363 }
 364
 365 static const struct iio_chan_spec mlx90614_channels[] = {
 366         {
 367                 .type = IIO_TEMP,
 368                 .modified = 1,
 369                 .channel2 = IIO_MOD_TEMP_AMBIENT,
 370                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 371                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
 372                     BIT(IIO_CHAN_INFO_SCALE),
 373         },
 374         {
 375                 .type = IIO_TEMP,
 376                 .modified = 1,
 377                 .channel2 = IIO_MOD_TEMP_OBJECT,
 378                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 379                     BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) |
 380                         BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
 381                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
 382                     BIT(IIO_CHAN_INFO_SCALE),
 383         },
 384         {
 385                 .type = IIO_TEMP,
 386                 .indexed = 1,
 387                 .modified = 1,
 388                 .channel = 1,
 389                 .channel2 = IIO_MOD_TEMP_OBJECT,
 390                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 391                     BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) |
 392                         BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
 393                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
 394                     BIT(IIO_CHAN_INFO_SCALE),
 395         },
 396 };
 397
 398 static const struct iio_info mlx90614_info = {
 399         .read_raw = mlx90614_read_raw,
 400         .write_raw = mlx90614_write_raw,
 401         .write_raw_get_fmt = mlx90614_write_raw_get_fmt,
 402         .attrs = &mlx90614_attr_group,
 403         .driver_module = THIS_MODULE,
 404 };
 405
 406 #ifdef CONFIG_PM
 407 static int mlx90614_sleep(struct mlx90614_data *data)
 408 {
 409         s32 ret;
 410
 411         if (!data->wakeup_gpio) {
 412                 dev_dbg(&data->client->dev, "Sleep disabled");
 413                 return -ENOSYS;
 414         }
 415
 416         dev_dbg(&data->client->dev, "Requesting sleep");
 417
 418         mutex_lock(&data->lock);
 419         ret = i2c_smbus_xfer(data->client->adapter, data->client->addr,
 420                              data->client->flags | I2C_CLIENT_PEC,
 421                              I2C_SMBUS_WRITE, MLX90614_OP_SLEEP,
 422                              I2C_SMBUS_BYTE, NULL);
 423         mutex_unlock(&data->lock);
 424
 425         return ret;
 426 }
 427
 428 static int mlx90614_wakeup(struct mlx90614_data *data)
 429 {
 430         if (!data->wakeup_gpio) {
 431                 dev_dbg(&data->client->dev, "Wake-up disabled");
 432                 return -ENOSYS;
 433         }
 434
 435         dev_dbg(&data->client->dev, "Requesting wake-up");
 436
 437         i2c_lock_adapter(data->client->adapter);
 438         gpiod_direction_output(data->wakeup_gpio, 0);
 439         msleep(MLX90614_TIMING_WAKEUP);
 440         gpiod_direction_input(data->wakeup_gpio);
 441         i2c_unlock_adapter(data->client->adapter);
 442
 443         data->ready_timestamp = jiffies +
 444                         msecs_to_jiffies(MLX90614_TIMING_STARTUP);
 445
 446         /*
 447          * Quirk: the i2c controller may get confused right after the
 448          * wake-up signal has been sent.  As a workaround, do a dummy read.
 449          * If the read fails, the controller will probably be reset so that
 450          * further reads will work.
 451          */
 452         i2c_smbus_read_word_data(data->client, MLX90614_CONFIG);
 453
 454         return 0;
 455 }
 456
 457 /* Return wake-up GPIO or NULL if sleep functionality should be disabled. */
 458 static struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client)
 459 {
 460         struct gpio_desc *gpio;
 461
 462         if (!i2c_check_functionality(client->adapter,
 463                                                 I2C_FUNC_SMBUS_WRITE_BYTE)) {
 464                 dev_info(&client->dev,
 465                          "i2c adapter does not support SMBUS_WRITE_BYTE, sleep disabled");
 466                 return NULL;
 467         }
 468
 469         gpio = devm_gpiod_get_optional(&client->dev, "wakeup", GPIOD_IN);
 470
 471         if (IS_ERR(gpio)) {
 472                 dev_warn(&client->dev,
 473                          "gpio acquisition failed with error %ld, sleep disabled",
 474                          PTR_ERR(gpio));
 475                 return NULL;
 476         } else if (!gpio) {
 477                 dev_info(&client->dev,
 478                          "wakeup-gpio not found, sleep disabled");
 479         }
 480
 481         return gpio;
 482 }
 483 #else
 484 static inline int mlx90614_sleep(struct mlx90614_data *data)
 485 {
 486         return -ENOSYS;
 487 }
 488 static inline int mlx90614_wakeup(struct mlx90614_data *data)
 489 {
 490         return -ENOSYS;
 491 }
 492 static inline struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client)
 493 {
 494         return NULL;
 495 }
 496 #endif
 497
 498 /* Return 0 for single sensor, 1 for dual sensor, <0 on error. */
 499 static int mlx90614_probe_num_ir_sensors(struct i2c_client *client)
 500 {
 501         s32 ret;
 502
 503         ret = i2c_smbus_read_word_data(client, MLX90614_CONFIG);
 504
 505         if (ret < 0)
 506                 return ret;
 507
 508         return (ret & MLX90614_CONFIG_DUAL_MASK) ? 1 : 0;
 509 }
 510
 511 static int mlx90614_probe(struct i2c_client *client,
 512                          const struct i2c_device_id *id)
 513 {
 514         struct iio_dev *indio_dev;
 515         struct mlx90614_data *data;
 516         int ret;
 517
 518         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
 519                 return -EOPNOTSUPP;
 520
 521         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 522         if (!indio_dev)
 523                 return -ENOMEM;
 524
 525         data = iio_priv(indio_dev);
 526         i2c_set_clientdata(client, indio_dev);
 527         data->client = client;
 528         mutex_init(&data->lock);
 529         data->wakeup_gpio = mlx90614_probe_wakeup(client);
 530
 531         mlx90614_wakeup(data);
 532
 533         indio_dev->dev.parent = &client->dev;
 534         indio_dev->name = id->name;
 535         indio_dev->modes = INDIO_DIRECT_MODE;
 536         indio_dev->info = &mlx90614_info;
 537
 538         ret = mlx90614_probe_num_ir_sensors(client);
 539         switch (ret) {
 540         case 0:
 541                 dev_dbg(&client->dev, "Found single sensor");
 542                 indio_dev->channels = mlx90614_channels;
 543                 indio_dev->num_channels = 2;
 544                 break;
 545         case 1:
 546                 dev_dbg(&client->dev, "Found dual sensor");
 547                 indio_dev->channels = mlx90614_channels;
 548                 indio_dev->num_channels = 3;
 549                 break;
 550         default:
 551                 return ret;
 552         }
 553
 554         if (data->wakeup_gpio) {
 555                 pm_runtime_set_autosuspend_delay(&client->dev,
 556                                                  MLX90614_AUTOSLEEP_DELAY);
 557                 pm_runtime_use_autosuspend(&client->dev);
 558                 pm_runtime_set_active(&client->dev);
 559                 pm_runtime_enable(&client->dev);
 560         }
 561
 562         return iio_device_register(indio_dev);
 563 }
 564
 565 static int mlx90614_remove(struct i2c_client *client)
 566 {
 567         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 568         struct mlx90614_data *data = iio_priv(indio_dev);
 569
 570         iio_device_unregister(indio_dev);
 571
 572         if (data->wakeup_gpio) {
 573                 pm_runtime_disable(&client->dev);
 574                 if (!pm_runtime_status_suspended(&client->dev))
 575                         mlx90614_sleep(data);
 576                 pm_runtime_set_suspended(&client->dev);
 577         }
 578
 579         return 0;
 580 }
 581
 582 static const struct i2c_device_id mlx90614_id[] = {
 583         { "mlx90614", 0 },
 584         { }
 585 };
 586 MODULE_DEVICE_TABLE(i2c, mlx90614_id);
 587
 588 #ifdef CONFIG_PM_SLEEP
 589 static int mlx90614_pm_suspend(struct device *dev)
 590 {
 591         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 592         struct mlx90614_data *data = iio_priv(indio_dev);
 593
 594         if (data->wakeup_gpio && pm_runtime_active(dev))
 595                 return mlx90614_sleep(data);
 596
 597         return 0;
 598 }
 599
 600 static int mlx90614_pm_resume(struct device *dev)
 601 {
 602         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 603         struct mlx90614_data *data = iio_priv(indio_dev);
 604         int err;
 605
 606         if (data->wakeup_gpio) {
 607                 err = mlx90614_wakeup(data);
 608                 if (err < 0)
 609                         return err;
 610
 611                 pm_runtime_disable(dev);
 612                 pm_runtime_set_active(dev);
 613                 pm_runtime_enable(dev);
 614         }
 615
 616         return 0;
 617 }
 618 #endif
 619
 620 #ifdef CONFIG_PM
 621 static int mlx90614_pm_runtime_suspend(struct device *dev)
 622 {
 623         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 624         struct mlx90614_data *data = iio_priv(indio_dev);
 625
 626         return mlx90614_sleep(data);
 627 }
 628
 629 static int mlx90614_pm_runtime_resume(struct device *dev)
 630 {
 631         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 632         struct mlx90614_data *data = iio_priv(indio_dev);
 633
 634         return mlx90614_wakeup(data);
 635 }
 636 #endif
 637
 638 static const struct dev_pm_ops mlx90614_pm_ops = {
 639         SET_SYSTEM_SLEEP_PM_OPS(mlx90614_pm_suspend, mlx90614_pm_resume)
 640         SET_RUNTIME_PM_OPS(mlx90614_pm_runtime_suspend,
 641                            mlx90614_pm_runtime_resume, NULL)
 642 };
 643
 644 static struct i2c_driver mlx90614_driver = {
 645         .driver = {
 646                 .name   = "mlx90614",
 647                 .pm     = &mlx90614_pm_ops,
 648         },
 649         .probe = mlx90614_probe,
 650         .remove = mlx90614_remove,
 651         .id_table = mlx90614_id,
 652 };
 653 module_i2c_driver(mlx90614_driver);
 654
 655 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
 656 MODULE_AUTHOR("Vianney le Clément de Saint-Marcq <vianney.leclement@essensium.com>");
 657 MODULE_AUTHOR("Crt Mori <cmo@melexis.com>");
 658 MODULE_DESCRIPTION("Melexis MLX90614 contactless IR temperature sensor driver");
 659 MODULE_LICENSE("GPL");