1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * mlx90614.c - Support for Melexis MLX90614 contactless IR temperature sensor 4 * 5 * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net> 6 * Copyright (c) 2015 Essensium NV 7 * Copyright (c) 2015 Melexis 8 * 9 * Driver for the Melexis MLX90614 I2C 16-bit IR thermopile sensor 10 * 11 * (7-bit I2C slave address 0x5a, 100KHz bus speed only!) 12 * 13 * To wake up from sleep mode, the SDA line must be held low while SCL is high 14 * for at least 33ms. This is achieved with an extra GPIO that can be connected 15 * directly to the SDA line. In normal operation, the GPIO is set as input and 16 * will not interfere in I2C communication. While the GPIO is driven low, the 17 * i2c adapter is locked since it cannot be used by other clients. The SCL line 18 * always has a pull-up so we do not need an extra GPIO to drive it high. If 19 * the "wakeup" GPIO is not given, power management will be disabled. 20 */ 21 22 #include <linux/err.h> 23 #include <linux/i2c.h> 24 #include <linux/module.h> 25 #include <linux/delay.h> 26 #include <linux/jiffies.h> 27 #include <linux/gpio/consumer.h> 28 #include <linux/pm_runtime.h> 29 30 #include <linux/iio/iio.h> 31 #include <linux/iio/sysfs.h> 32 33 #define MLX90614_OP_RAM 0x00 34 #define MLX90614_OP_EEPROM 0x20 35 #define MLX90614_OP_SLEEP 0xff 36 37 /* RAM offsets with 16-bit data, MSB first */ 38 #define MLX90614_RAW1 (MLX90614_OP_RAM | 0x04) /* raw data IR channel 1 */ 39 #define MLX90614_RAW2 (MLX90614_OP_RAM | 0x05) /* raw data IR channel 2 */ 40 #define MLX90614_TA (MLX90614_OP_RAM | 0x06) /* ambient temperature */ 41 #define MLX90614_TOBJ1 (MLX90614_OP_RAM | 0x07) /* object 1 temperature */ 42 #define MLX90614_TOBJ2 (MLX90614_OP_RAM | 0x08) /* object 2 temperature */ 43 44 /* EEPROM offsets with 16-bit data, MSB first */ 45 #define MLX90614_EMISSIVITY (MLX90614_OP_EEPROM | 0x04) /* emissivity correction coefficient */ 46 #define MLX90614_CONFIG (MLX90614_OP_EEPROM | 0x05) /* configuration register */ 47 48 /* Control bits in configuration register */ 49 #define MLX90614_CONFIG_IIR_SHIFT 0 /* IIR coefficient */ 50 #define MLX90614_CONFIG_IIR_MASK (0x7 << MLX90614_CONFIG_IIR_SHIFT) 51 #define MLX90614_CONFIG_DUAL_SHIFT 6 /* single (0) or dual (1) IR sensor */ 52 #define MLX90614_CONFIG_DUAL_MASK (1 << MLX90614_CONFIG_DUAL_SHIFT) 53 #define MLX90614_CONFIG_FIR_SHIFT 8 /* FIR coefficient */ 54 #define MLX90614_CONFIG_FIR_MASK (0x7 << MLX90614_CONFIG_FIR_SHIFT) 55 #define MLX90614_CONFIG_GAIN_SHIFT 11 /* gain */ 56 #define MLX90614_CONFIG_GAIN_MASK (0x7 << MLX90614_CONFIG_GAIN_SHIFT) 57 58 /* Timings (in ms) */ 59 #define MLX90614_TIMING_EEPROM 20 /* time for EEPROM write/erase to complete */ 60 #define MLX90614_TIMING_WAKEUP 34 /* time to hold SDA low for wake-up */ 61 #define MLX90614_TIMING_STARTUP 250 /* time before first data after wake-up */ 62 63 #define MLX90614_AUTOSLEEP_DELAY 5000 /* default autosleep delay */ 64 65 /* Magic constants */ 66 #define MLX90614_CONST_OFFSET_DEC -13657 /* decimal part of the Kelvin offset */ 67 #define MLX90614_CONST_OFFSET_REM 500000 /* remainder of offset (273.15*50) */ 68 #define MLX90614_CONST_SCALE 20 /* Scale in milliKelvin (0.02 * 1000) */ 69 #define MLX90614_CONST_RAW_EMISSIVITY_MAX 65535 /* max value for emissivity */ 70 #define MLX90614_CONST_EMISSIVITY_RESOLUTION 15259 /* 1/65535 ~ 0.000015259 */ 71 #define MLX90614_CONST_FIR 0x7 /* Fixed value for FIR part of low pass filter */ 72 73 struct mlx90614_data { 74 struct i2c_client *client; 75 struct mutex lock; /* for EEPROM access only */ 76 struct gpio_desc *wakeup_gpio; /* NULL to disable sleep/wake-up */ 77 unsigned long ready_timestamp; /* in jiffies */ 78 }; 79 80 /* Bandwidth values for IIR filtering */ 81 static const int mlx90614_iir_values[] = {77, 31, 20, 15, 723, 153, 110, 86}; 82 static IIO_CONST_ATTR(in_temp_object_filter_low_pass_3db_frequency_available, 83 "0.15 0.20 0.31 0.77 0.86 1.10 1.53 7.23"); 84 85 static struct attribute *mlx90614_attributes[] = { 86 &iio_const_attr_in_temp_object_filter_low_pass_3db_frequency_available.dev_attr.attr, 87 NULL, 88 }; 89 90 static const struct attribute_group mlx90614_attr_group = { 91 .attrs = mlx90614_attributes, 92 }; 93 94 /* 95 * Erase an address and write word. 96 * The mutex must be locked before calling. 97 */ 98 static s32 mlx90614_write_word(const struct i2c_client *client, u8 command, 99 u16 value) 100 { 101 /* 102 * Note: The mlx90614 requires a PEC on writing but does not send us a 103 * valid PEC on reading. Hence, we cannot set I2C_CLIENT_PEC in 104 * i2c_client.flags. As a workaround, we use i2c_smbus_xfer here. 105 */ 106 union i2c_smbus_data data; 107 s32 ret; 108 109 dev_dbg(&client->dev, "Writing 0x%x to address 0x%x", value, command); 110 111 data.word = 0x0000; /* erase command */ 112 ret = i2c_smbus_xfer(client->adapter, client->addr, 113 client->flags | I2C_CLIENT_PEC, 114 I2C_SMBUS_WRITE, command, 115 I2C_SMBUS_WORD_DATA, &data); 116 if (ret < 0) 117 return ret; 118 119 msleep(MLX90614_TIMING_EEPROM); 120 121 data.word = value; /* actual write */ 122 ret = i2c_smbus_xfer(client->adapter, client->addr, 123 client->flags | I2C_CLIENT_PEC, 124 I2C_SMBUS_WRITE, command, 125 I2C_SMBUS_WORD_DATA, &data); 126 127 msleep(MLX90614_TIMING_EEPROM); 128 129 return ret; 130 } 131 132 /* 133 * Find the IIR value inside mlx90614_iir_values array and return its position 134 * which is equivalent to the bit value in sensor register 135 */ 136 static inline s32 mlx90614_iir_search(const struct i2c_client *client, 137 int value) 138 { 139 int i; 140 s32 ret; 141 142 for (i = 0; i < ARRAY_SIZE(mlx90614_iir_values); ++i) { 143 if (value == mlx90614_iir_values[i]) 144 break; 145 } 146 147 if (i == ARRAY_SIZE(mlx90614_iir_values)) 148 return -EINVAL; 149 150 /* 151 * CONFIG register values must not be changed so 152 * we must read them before we actually write 153 * changes 154 */ 155 ret = i2c_smbus_read_word_data(client, MLX90614_CONFIG); 156 if (ret < 0) 157 return ret; 158 159 ret &= ~MLX90614_CONFIG_FIR_MASK; 160 ret |= MLX90614_CONST_FIR << MLX90614_CONFIG_FIR_SHIFT; 161 ret &= ~MLX90614_CONFIG_IIR_MASK; 162 ret |= i << MLX90614_CONFIG_IIR_SHIFT; 163 164 /* Write changed values */ 165 ret = mlx90614_write_word(client, MLX90614_CONFIG, ret); 166 return ret; 167 } 168 169 #ifdef CONFIG_PM 170 /* 171 * If @startup is true, make sure MLX90614_TIMING_STARTUP ms have elapsed since 172 * the last wake-up. This is normally only needed to get a valid temperature 173 * reading. EEPROM access does not need such delay. 174 * Return 0 on success, <0 on error. 175 */ 176 static int mlx90614_power_get(struct mlx90614_data *data, bool startup) 177 { 178 unsigned long now; 179 180 if (!data->wakeup_gpio) 181 return 0; 182 183 pm_runtime_get_sync(&data->client->dev); 184 185 if (startup) { 186 now = jiffies; 187 if (time_before(now, data->ready_timestamp) && 188 msleep_interruptible(jiffies_to_msecs( 189 data->ready_timestamp - now)) != 0) { 190 pm_runtime_put_autosuspend(&data->client->dev); 191 return -EINTR; 192 } 193 } 194 195 return 0; 196 } 197 198 static void mlx90614_power_put(struct mlx90614_data *data) 199 { 200 if (!data->wakeup_gpio) 201 return; 202 203 pm_runtime_mark_last_busy(&data->client->dev); 204 pm_runtime_put_autosuspend(&data->client->dev); 205 } 206 #else 207 static inline int mlx90614_power_get(struct mlx90614_data *data, bool startup) 208 { 209 return 0; 210 } 211 212 static inline void mlx90614_power_put(struct mlx90614_data *data) 213 { 214 } 215 #endif 216 217 static int mlx90614_read_raw(struct iio_dev *indio_dev, 218 struct iio_chan_spec const *channel, int *val, 219 int *val2, long mask) 220 { 221 struct mlx90614_data *data = iio_priv(indio_dev); 222 u8 cmd; 223 s32 ret; 224 225 switch (mask) { 226 case IIO_CHAN_INFO_RAW: /* 0.02K / LSB */ 227 switch (channel->channel2) { 228 case IIO_MOD_TEMP_AMBIENT: 229 cmd = MLX90614_TA; 230 break; 231 case IIO_MOD_TEMP_OBJECT: 232 switch (channel->channel) { 233 case 0: 234 cmd = MLX90614_TOBJ1; 235 break; 236 case 1: 237 cmd = MLX90614_TOBJ2; 238 break; 239 default: 240 return -EINVAL; 241 } 242 break; 243 default: 244 return -EINVAL; 245 } 246 247 ret = mlx90614_power_get(data, true); 248 if (ret < 0) 249 return ret; 250 ret = i2c_smbus_read_word_data(data->client, cmd); 251 mlx90614_power_put(data); 252 253 if (ret < 0) 254 return ret; 255 256 /* MSB is an error flag */ 257 if (ret & 0x8000) 258 return -EIO; 259 260 *val = ret; 261 return IIO_VAL_INT; 262 case IIO_CHAN_INFO_OFFSET: 263 *val = MLX90614_CONST_OFFSET_DEC; 264 *val2 = MLX90614_CONST_OFFSET_REM; 265 return IIO_VAL_INT_PLUS_MICRO; 266 case IIO_CHAN_INFO_SCALE: 267 *val = MLX90614_CONST_SCALE; 268 return IIO_VAL_INT; 269 case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/65535 / LSB */ 270 mlx90614_power_get(data, false); 271 mutex_lock(&data->lock); 272 ret = i2c_smbus_read_word_data(data->client, 273 MLX90614_EMISSIVITY); 274 mutex_unlock(&data->lock); 275 mlx90614_power_put(data); 276 277 if (ret < 0) 278 return ret; 279 280 if (ret == MLX90614_CONST_RAW_EMISSIVITY_MAX) { 281 *val = 1; 282 *val2 = 0; 283 } else { 284 *val = 0; 285 *val2 = ret * MLX90614_CONST_EMISSIVITY_RESOLUTION; 286 } 287 return IIO_VAL_INT_PLUS_NANO; 288 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR setting with 289 FIR = 1024 */ 290 mlx90614_power_get(data, false); 291 mutex_lock(&data->lock); 292 ret = i2c_smbus_read_word_data(data->client, MLX90614_CONFIG); 293 mutex_unlock(&data->lock); 294 mlx90614_power_put(data); 295 296 if (ret < 0) 297 return ret; 298 299 *val = mlx90614_iir_values[ret & MLX90614_CONFIG_IIR_MASK] / 100; 300 *val2 = (mlx90614_iir_values[ret & MLX90614_CONFIG_IIR_MASK] % 100) * 301 10000; 302 return IIO_VAL_INT_PLUS_MICRO; 303 default: 304 return -EINVAL; 305 } 306 } 307 308 static int mlx90614_write_raw(struct iio_dev *indio_dev, 309 struct iio_chan_spec const *channel, int val, 310 int val2, long mask) 311 { 312 struct mlx90614_data *data = iio_priv(indio_dev); 313 s32 ret; 314 315 switch (mask) { 316 case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/65535 / LSB */ 317 if (val < 0 || val2 < 0 || val > 1 || (val == 1 && val2 != 0)) 318 return -EINVAL; 319 val = val * MLX90614_CONST_RAW_EMISSIVITY_MAX + 320 val2 / MLX90614_CONST_EMISSIVITY_RESOLUTION; 321 322 mlx90614_power_get(data, false); 323 mutex_lock(&data->lock); 324 ret = mlx90614_write_word(data->client, MLX90614_EMISSIVITY, 325 val); 326 mutex_unlock(&data->lock); 327 mlx90614_power_put(data); 328 329 return ret; 330 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR Filter setting */ 331 if (val < 0 || val2 < 0) 332 return -EINVAL; 333 334 mlx90614_power_get(data, false); 335 mutex_lock(&data->lock); 336 ret = mlx90614_iir_search(data->client, 337 val * 100 + val2 / 10000); 338 mutex_unlock(&data->lock); 339 mlx90614_power_put(data); 340 341 return ret; 342 default: 343 return -EINVAL; 344 } 345 } 346 347 static int mlx90614_write_raw_get_fmt(struct iio_dev *indio_dev, 348 struct iio_chan_spec const *channel, 349 long mask) 350 { 351 switch (mask) { 352 case IIO_CHAN_INFO_CALIBEMISSIVITY: 353 return IIO_VAL_INT_PLUS_NANO; 354 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: 355 return IIO_VAL_INT_PLUS_MICRO; 356 default: 357 return -EINVAL; 358 } 359 } 360 361 static const struct iio_chan_spec mlx90614_channels[] = { 362 { 363 .type = IIO_TEMP, 364 .modified = 1, 365 .channel2 = IIO_MOD_TEMP_AMBIENT, 366 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 367 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 368 BIT(IIO_CHAN_INFO_SCALE), 369 }, 370 { 371 .type = IIO_TEMP, 372 .modified = 1, 373 .channel2 = IIO_MOD_TEMP_OBJECT, 374 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 375 BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) | 376 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), 377 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 378 BIT(IIO_CHAN_INFO_SCALE), 379 }, 380 { 381 .type = IIO_TEMP, 382 .indexed = 1, 383 .modified = 1, 384 .channel = 1, 385 .channel2 = IIO_MOD_TEMP_OBJECT, 386 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 387 BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) | 388 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), 389 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 390 BIT(IIO_CHAN_INFO_SCALE), 391 }, 392 }; 393 394 static const struct iio_info mlx90614_info = { 395 .read_raw = mlx90614_read_raw, 396 .write_raw = mlx90614_write_raw, 397 .write_raw_get_fmt = mlx90614_write_raw_get_fmt, 398 .attrs = &mlx90614_attr_group, 399 }; 400 401 #ifdef CONFIG_PM 402 static int mlx90614_sleep(struct mlx90614_data *data) 403 { 404 s32 ret; 405 406 if (!data->wakeup_gpio) { 407 dev_dbg(&data->client->dev, "Sleep disabled"); 408 return -ENOSYS; 409 } 410 411 dev_dbg(&data->client->dev, "Requesting sleep"); 412 413 mutex_lock(&data->lock); 414 ret = i2c_smbus_xfer(data->client->adapter, data->client->addr, 415 data->client->flags | I2C_CLIENT_PEC, 416 I2C_SMBUS_WRITE, MLX90614_OP_SLEEP, 417 I2C_SMBUS_BYTE, NULL); 418 mutex_unlock(&data->lock); 419 420 return ret; 421 } 422 423 static int mlx90614_wakeup(struct mlx90614_data *data) 424 { 425 if (!data->wakeup_gpio) { 426 dev_dbg(&data->client->dev, "Wake-up disabled"); 427 return -ENOSYS; 428 } 429 430 dev_dbg(&data->client->dev, "Requesting wake-up"); 431 432 i2c_lock_bus(data->client->adapter, I2C_LOCK_ROOT_ADAPTER); 433 gpiod_direction_output(data->wakeup_gpio, 0); 434 msleep(MLX90614_TIMING_WAKEUP); 435 gpiod_direction_input(data->wakeup_gpio); 436 i2c_unlock_bus(data->client->adapter, I2C_LOCK_ROOT_ADAPTER); 437 438 data->ready_timestamp = jiffies + 439 msecs_to_jiffies(MLX90614_TIMING_STARTUP); 440 441 /* 442 * Quirk: the i2c controller may get confused right after the 443 * wake-up signal has been sent. As a workaround, do a dummy read. 444 * If the read fails, the controller will probably be reset so that 445 * further reads will work. 446 */ 447 i2c_smbus_read_word_data(data->client, MLX90614_CONFIG); 448 449 return 0; 450 } 451 452 /* Return wake-up GPIO or NULL if sleep functionality should be disabled. */ 453 static struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client) 454 { 455 struct gpio_desc *gpio; 456 457 if (!i2c_check_functionality(client->adapter, 458 I2C_FUNC_SMBUS_WRITE_BYTE)) { 459 dev_info(&client->dev, 460 "i2c adapter does not support SMBUS_WRITE_BYTE, sleep disabled"); 461 return NULL; 462 } 463 464 gpio = devm_gpiod_get_optional(&client->dev, "wakeup", GPIOD_IN); 465 466 if (IS_ERR(gpio)) { 467 dev_warn(&client->dev, 468 "gpio acquisition failed with error %ld, sleep disabled", 469 PTR_ERR(gpio)); 470 return NULL; 471 } else if (!gpio) { 472 dev_info(&client->dev, 473 "wakeup-gpio not found, sleep disabled"); 474 } 475 476 return gpio; 477 } 478 #else 479 static inline int mlx90614_sleep(struct mlx90614_data *data) 480 { 481 return -ENOSYS; 482 } 483 static inline int mlx90614_wakeup(struct mlx90614_data *data) 484 { 485 return -ENOSYS; 486 } 487 static inline struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client) 488 { 489 return NULL; 490 } 491 #endif 492 493 /* Return 0 for single sensor, 1 for dual sensor, <0 on error. */ 494 static int mlx90614_probe_num_ir_sensors(struct i2c_client *client) 495 { 496 s32 ret; 497 498 ret = i2c_smbus_read_word_data(client, MLX90614_CONFIG); 499 500 if (ret < 0) 501 return ret; 502 503 return (ret & MLX90614_CONFIG_DUAL_MASK) ? 1 : 0; 504 } 505 506 static int mlx90614_probe(struct i2c_client *client, 507 const struct i2c_device_id *id) 508 { 509 struct iio_dev *indio_dev; 510 struct mlx90614_data *data; 511 int ret; 512 513 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) 514 return -EOPNOTSUPP; 515 516 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 517 if (!indio_dev) 518 return -ENOMEM; 519 520 data = iio_priv(indio_dev); 521 i2c_set_clientdata(client, indio_dev); 522 data->client = client; 523 mutex_init(&data->lock); 524 data->wakeup_gpio = mlx90614_probe_wakeup(client); 525 526 mlx90614_wakeup(data); 527 528 indio_dev->name = id->name; 529 indio_dev->modes = INDIO_DIRECT_MODE; 530 indio_dev->info = &mlx90614_info; 531 532 ret = mlx90614_probe_num_ir_sensors(client); 533 switch (ret) { 534 case 0: 535 dev_dbg(&client->dev, "Found single sensor"); 536 indio_dev->channels = mlx90614_channels; 537 indio_dev->num_channels = 2; 538 break; 539 case 1: 540 dev_dbg(&client->dev, "Found dual sensor"); 541 indio_dev->channels = mlx90614_channels; 542 indio_dev->num_channels = 3; 543 break; 544 default: 545 return ret; 546 } 547 548 if (data->wakeup_gpio) { 549 pm_runtime_set_autosuspend_delay(&client->dev, 550 MLX90614_AUTOSLEEP_DELAY); 551 pm_runtime_use_autosuspend(&client->dev); 552 pm_runtime_set_active(&client->dev); 553 pm_runtime_enable(&client->dev); 554 } 555 556 return iio_device_register(indio_dev); 557 } 558 559 static int mlx90614_remove(struct i2c_client *client) 560 { 561 struct iio_dev *indio_dev = i2c_get_clientdata(client); 562 struct mlx90614_data *data = iio_priv(indio_dev); 563 564 iio_device_unregister(indio_dev); 565 566 if (data->wakeup_gpio) { 567 pm_runtime_disable(&client->dev); 568 if (!pm_runtime_status_suspended(&client->dev)) 569 mlx90614_sleep(data); 570 pm_runtime_set_suspended(&client->dev); 571 } 572 573 return 0; 574 } 575 576 static const struct i2c_device_id mlx90614_id[] = { 577 { "mlx90614", 0 }, 578 { } 579 }; 580 MODULE_DEVICE_TABLE(i2c, mlx90614_id); 581 582 static const struct of_device_id mlx90614_of_match[] = { 583 { .compatible = "melexis,mlx90614" }, 584 { } 585 }; 586 MODULE_DEVICE_TABLE(of, mlx90614_of_match); 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 .of_match_table = mlx90614_of_match, 648 .pm = &mlx90614_pm_ops, 649 }, 650 .probe = mlx90614_probe, 651 .remove = mlx90614_remove, 652 .id_table = mlx90614_id, 653 }; 654 module_i2c_driver(mlx90614_driver); 655 656 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); 657 MODULE_AUTHOR("Vianney le Clément de Saint-Marcq <vianney.leclement@essensium.com>"); 658 MODULE_AUTHOR("Crt Mori <cmo@melexis.com>"); 659 MODULE_DESCRIPTION("Melexis MLX90614 contactless IR temperature sensor driver"); 660 MODULE_LICENSE("GPL"); 661