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 int ret; 180 181 if (!data->wakeup_gpio) 182 return 0; 183 184 ret = pm_runtime_resume_and_get(&data->client->dev); 185 if (ret < 0) 186 return ret; 187 188 if (startup) { 189 now = jiffies; 190 if (time_before(now, data->ready_timestamp) && 191 msleep_interruptible(jiffies_to_msecs( 192 data->ready_timestamp - now)) != 0) { 193 pm_runtime_put_autosuspend(&data->client->dev); 194 return -EINTR; 195 } 196 } 197 198 return 0; 199 } 200 201 static void mlx90614_power_put(struct mlx90614_data *data) 202 { 203 if (!data->wakeup_gpio) 204 return; 205 206 pm_runtime_mark_last_busy(&data->client->dev); 207 pm_runtime_put_autosuspend(&data->client->dev); 208 } 209 #else 210 static inline int mlx90614_power_get(struct mlx90614_data *data, bool startup) 211 { 212 return 0; 213 } 214 215 static inline void mlx90614_power_put(struct mlx90614_data *data) 216 { 217 } 218 #endif 219 220 static int mlx90614_read_raw(struct iio_dev *indio_dev, 221 struct iio_chan_spec const *channel, int *val, 222 int *val2, long mask) 223 { 224 struct mlx90614_data *data = iio_priv(indio_dev); 225 u8 cmd; 226 s32 ret; 227 228 switch (mask) { 229 case IIO_CHAN_INFO_RAW: /* 0.02K / LSB */ 230 switch (channel->channel2) { 231 case IIO_MOD_TEMP_AMBIENT: 232 cmd = MLX90614_TA; 233 break; 234 case IIO_MOD_TEMP_OBJECT: 235 switch (channel->channel) { 236 case 0: 237 cmd = MLX90614_TOBJ1; 238 break; 239 case 1: 240 cmd = MLX90614_TOBJ2; 241 break; 242 default: 243 return -EINVAL; 244 } 245 break; 246 default: 247 return -EINVAL; 248 } 249 250 ret = mlx90614_power_get(data, true); 251 if (ret < 0) 252 return ret; 253 ret = i2c_smbus_read_word_data(data->client, cmd); 254 mlx90614_power_put(data); 255 256 if (ret < 0) 257 return ret; 258 259 /* MSB is an error flag */ 260 if (ret & 0x8000) 261 return -EIO; 262 263 *val = ret; 264 return IIO_VAL_INT; 265 case IIO_CHAN_INFO_OFFSET: 266 *val = MLX90614_CONST_OFFSET_DEC; 267 *val2 = MLX90614_CONST_OFFSET_REM; 268 return IIO_VAL_INT_PLUS_MICRO; 269 case IIO_CHAN_INFO_SCALE: 270 *val = MLX90614_CONST_SCALE; 271 return IIO_VAL_INT; 272 case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/65535 / LSB */ 273 ret = mlx90614_power_get(data, false); 274 if (ret < 0) 275 return ret; 276 277 mutex_lock(&data->lock); 278 ret = i2c_smbus_read_word_data(data->client, 279 MLX90614_EMISSIVITY); 280 mutex_unlock(&data->lock); 281 mlx90614_power_put(data); 282 283 if (ret < 0) 284 return ret; 285 286 if (ret == MLX90614_CONST_RAW_EMISSIVITY_MAX) { 287 *val = 1; 288 *val2 = 0; 289 } else { 290 *val = 0; 291 *val2 = ret * MLX90614_CONST_EMISSIVITY_RESOLUTION; 292 } 293 return IIO_VAL_INT_PLUS_NANO; 294 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR setting with 295 FIR = 1024 */ 296 ret = mlx90614_power_get(data, false); 297 if (ret < 0) 298 return ret; 299 300 mutex_lock(&data->lock); 301 ret = i2c_smbus_read_word_data(data->client, MLX90614_CONFIG); 302 mutex_unlock(&data->lock); 303 mlx90614_power_put(data); 304 305 if (ret < 0) 306 return ret; 307 308 *val = mlx90614_iir_values[ret & MLX90614_CONFIG_IIR_MASK] / 100; 309 *val2 = (mlx90614_iir_values[ret & MLX90614_CONFIG_IIR_MASK] % 100) * 310 10000; 311 return IIO_VAL_INT_PLUS_MICRO; 312 default: 313 return -EINVAL; 314 } 315 } 316 317 static int mlx90614_write_raw(struct iio_dev *indio_dev, 318 struct iio_chan_spec const *channel, int val, 319 int val2, long mask) 320 { 321 struct mlx90614_data *data = iio_priv(indio_dev); 322 s32 ret; 323 324 switch (mask) { 325 case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/65535 / LSB */ 326 if (val < 0 || val2 < 0 || val > 1 || (val == 1 && val2 != 0)) 327 return -EINVAL; 328 val = val * MLX90614_CONST_RAW_EMISSIVITY_MAX + 329 val2 / MLX90614_CONST_EMISSIVITY_RESOLUTION; 330 331 ret = mlx90614_power_get(data, false); 332 if (ret < 0) 333 return ret; 334 335 mutex_lock(&data->lock); 336 ret = mlx90614_write_word(data->client, MLX90614_EMISSIVITY, 337 val); 338 mutex_unlock(&data->lock); 339 mlx90614_power_put(data); 340 341 return ret; 342 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR Filter setting */ 343 if (val < 0 || val2 < 0) 344 return -EINVAL; 345 346 ret = mlx90614_power_get(data, false); 347 if (ret < 0) 348 return ret; 349 350 mutex_lock(&data->lock); 351 ret = mlx90614_iir_search(data->client, 352 val * 100 + val2 / 10000); 353 mutex_unlock(&data->lock); 354 mlx90614_power_put(data); 355 356 return ret; 357 default: 358 return -EINVAL; 359 } 360 } 361 362 static int mlx90614_write_raw_get_fmt(struct iio_dev *indio_dev, 363 struct iio_chan_spec const *channel, 364 long mask) 365 { 366 switch (mask) { 367 case IIO_CHAN_INFO_CALIBEMISSIVITY: 368 return IIO_VAL_INT_PLUS_NANO; 369 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: 370 return IIO_VAL_INT_PLUS_MICRO; 371 default: 372 return -EINVAL; 373 } 374 } 375 376 static const struct iio_chan_spec mlx90614_channels[] = { 377 { 378 .type = IIO_TEMP, 379 .modified = 1, 380 .channel2 = IIO_MOD_TEMP_AMBIENT, 381 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 382 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 383 BIT(IIO_CHAN_INFO_SCALE), 384 }, 385 { 386 .type = IIO_TEMP, 387 .modified = 1, 388 .channel2 = IIO_MOD_TEMP_OBJECT, 389 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 390 BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) | 391 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), 392 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 393 BIT(IIO_CHAN_INFO_SCALE), 394 }, 395 { 396 .type = IIO_TEMP, 397 .indexed = 1, 398 .modified = 1, 399 .channel = 1, 400 .channel2 = IIO_MOD_TEMP_OBJECT, 401 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 402 BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) | 403 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), 404 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 405 BIT(IIO_CHAN_INFO_SCALE), 406 }, 407 }; 408 409 static const struct iio_info mlx90614_info = { 410 .read_raw = mlx90614_read_raw, 411 .write_raw = mlx90614_write_raw, 412 .write_raw_get_fmt = mlx90614_write_raw_get_fmt, 413 .attrs = &mlx90614_attr_group, 414 }; 415 416 #ifdef CONFIG_PM 417 static int mlx90614_sleep(struct mlx90614_data *data) 418 { 419 s32 ret; 420 421 if (!data->wakeup_gpio) { 422 dev_dbg(&data->client->dev, "Sleep disabled"); 423 return -ENOSYS; 424 } 425 426 dev_dbg(&data->client->dev, "Requesting sleep"); 427 428 mutex_lock(&data->lock); 429 ret = i2c_smbus_xfer(data->client->adapter, data->client->addr, 430 data->client->flags | I2C_CLIENT_PEC, 431 I2C_SMBUS_WRITE, MLX90614_OP_SLEEP, 432 I2C_SMBUS_BYTE, NULL); 433 mutex_unlock(&data->lock); 434 435 return ret; 436 } 437 438 static int mlx90614_wakeup(struct mlx90614_data *data) 439 { 440 if (!data->wakeup_gpio) { 441 dev_dbg(&data->client->dev, "Wake-up disabled"); 442 return -ENOSYS; 443 } 444 445 dev_dbg(&data->client->dev, "Requesting wake-up"); 446 447 i2c_lock_bus(data->client->adapter, I2C_LOCK_ROOT_ADAPTER); 448 gpiod_direction_output(data->wakeup_gpio, 0); 449 msleep(MLX90614_TIMING_WAKEUP); 450 gpiod_direction_input(data->wakeup_gpio); 451 i2c_unlock_bus(data->client->adapter, I2C_LOCK_ROOT_ADAPTER); 452 453 data->ready_timestamp = jiffies + 454 msecs_to_jiffies(MLX90614_TIMING_STARTUP); 455 456 /* 457 * Quirk: the i2c controller may get confused right after the 458 * wake-up signal has been sent. As a workaround, do a dummy read. 459 * If the read fails, the controller will probably be reset so that 460 * further reads will work. 461 */ 462 i2c_smbus_read_word_data(data->client, MLX90614_CONFIG); 463 464 return 0; 465 } 466 467 /* Return wake-up GPIO or NULL if sleep functionality should be disabled. */ 468 static struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client) 469 { 470 struct gpio_desc *gpio; 471 472 if (!i2c_check_functionality(client->adapter, 473 I2C_FUNC_SMBUS_WRITE_BYTE)) { 474 dev_info(&client->dev, 475 "i2c adapter does not support SMBUS_WRITE_BYTE, sleep disabled"); 476 return NULL; 477 } 478 479 gpio = devm_gpiod_get_optional(&client->dev, "wakeup", GPIOD_IN); 480 481 if (IS_ERR(gpio)) { 482 dev_warn(&client->dev, 483 "gpio acquisition failed with error %ld, sleep disabled", 484 PTR_ERR(gpio)); 485 return NULL; 486 } else if (!gpio) { 487 dev_info(&client->dev, 488 "wakeup-gpio not found, sleep disabled"); 489 } 490 491 return gpio; 492 } 493 #else 494 static inline int mlx90614_sleep(struct mlx90614_data *data) 495 { 496 return -ENOSYS; 497 } 498 static inline int mlx90614_wakeup(struct mlx90614_data *data) 499 { 500 return -ENOSYS; 501 } 502 static inline struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client) 503 { 504 return NULL; 505 } 506 #endif 507 508 /* Return 0 for single sensor, 1 for dual sensor, <0 on error. */ 509 static int mlx90614_probe_num_ir_sensors(struct i2c_client *client) 510 { 511 s32 ret; 512 513 ret = i2c_smbus_read_word_data(client, MLX90614_CONFIG); 514 515 if (ret < 0) 516 return ret; 517 518 return (ret & MLX90614_CONFIG_DUAL_MASK) ? 1 : 0; 519 } 520 521 static int mlx90614_probe(struct i2c_client *client, 522 const struct i2c_device_id *id) 523 { 524 struct iio_dev *indio_dev; 525 struct mlx90614_data *data; 526 int ret; 527 528 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) 529 return -EOPNOTSUPP; 530 531 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 532 if (!indio_dev) 533 return -ENOMEM; 534 535 data = iio_priv(indio_dev); 536 i2c_set_clientdata(client, indio_dev); 537 data->client = client; 538 mutex_init(&data->lock); 539 data->wakeup_gpio = mlx90614_probe_wakeup(client); 540 541 mlx90614_wakeup(data); 542 543 indio_dev->name = id->name; 544 indio_dev->modes = INDIO_DIRECT_MODE; 545 indio_dev->info = &mlx90614_info; 546 547 ret = mlx90614_probe_num_ir_sensors(client); 548 switch (ret) { 549 case 0: 550 dev_dbg(&client->dev, "Found single sensor"); 551 indio_dev->channels = mlx90614_channels; 552 indio_dev->num_channels = 2; 553 break; 554 case 1: 555 dev_dbg(&client->dev, "Found dual sensor"); 556 indio_dev->channels = mlx90614_channels; 557 indio_dev->num_channels = 3; 558 break; 559 default: 560 return ret; 561 } 562 563 if (data->wakeup_gpio) { 564 pm_runtime_set_autosuspend_delay(&client->dev, 565 MLX90614_AUTOSLEEP_DELAY); 566 pm_runtime_use_autosuspend(&client->dev); 567 pm_runtime_set_active(&client->dev); 568 pm_runtime_enable(&client->dev); 569 } 570 571 return iio_device_register(indio_dev); 572 } 573 574 static int mlx90614_remove(struct i2c_client *client) 575 { 576 struct iio_dev *indio_dev = i2c_get_clientdata(client); 577 struct mlx90614_data *data = iio_priv(indio_dev); 578 579 iio_device_unregister(indio_dev); 580 581 if (data->wakeup_gpio) { 582 pm_runtime_disable(&client->dev); 583 if (!pm_runtime_status_suspended(&client->dev)) 584 mlx90614_sleep(data); 585 pm_runtime_set_suspended(&client->dev); 586 } 587 588 return 0; 589 } 590 591 static const struct i2c_device_id mlx90614_id[] = { 592 { "mlx90614", 0 }, 593 { } 594 }; 595 MODULE_DEVICE_TABLE(i2c, mlx90614_id); 596 597 static const struct of_device_id mlx90614_of_match[] = { 598 { .compatible = "melexis,mlx90614" }, 599 { } 600 }; 601 MODULE_DEVICE_TABLE(of, mlx90614_of_match); 602 603 #ifdef CONFIG_PM_SLEEP 604 static int mlx90614_pm_suspend(struct device *dev) 605 { 606 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 607 struct mlx90614_data *data = iio_priv(indio_dev); 608 609 if (data->wakeup_gpio && pm_runtime_active(dev)) 610 return mlx90614_sleep(data); 611 612 return 0; 613 } 614 615 static int mlx90614_pm_resume(struct device *dev) 616 { 617 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 618 struct mlx90614_data *data = iio_priv(indio_dev); 619 int err; 620 621 if (data->wakeup_gpio) { 622 err = mlx90614_wakeup(data); 623 if (err < 0) 624 return err; 625 626 pm_runtime_disable(dev); 627 pm_runtime_set_active(dev); 628 pm_runtime_enable(dev); 629 } 630 631 return 0; 632 } 633 #endif 634 635 #ifdef CONFIG_PM 636 static int mlx90614_pm_runtime_suspend(struct device *dev) 637 { 638 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 639 struct mlx90614_data *data = iio_priv(indio_dev); 640 641 return mlx90614_sleep(data); 642 } 643 644 static int mlx90614_pm_runtime_resume(struct device *dev) 645 { 646 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 647 struct mlx90614_data *data = iio_priv(indio_dev); 648 649 return mlx90614_wakeup(data); 650 } 651 #endif 652 653 static const struct dev_pm_ops mlx90614_pm_ops = { 654 SET_SYSTEM_SLEEP_PM_OPS(mlx90614_pm_suspend, mlx90614_pm_resume) 655 SET_RUNTIME_PM_OPS(mlx90614_pm_runtime_suspend, 656 mlx90614_pm_runtime_resume, NULL) 657 }; 658 659 static struct i2c_driver mlx90614_driver = { 660 .driver = { 661 .name = "mlx90614", 662 .of_match_table = mlx90614_of_match, 663 .pm = &mlx90614_pm_ops, 664 }, 665 .probe = mlx90614_probe, 666 .remove = mlx90614_remove, 667 .id_table = mlx90614_id, 668 }; 669 module_i2c_driver(mlx90614_driver); 670 671 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); 672 MODULE_AUTHOR("Vianney le Clément de Saint-Marcq <vianney.leclement@essensium.com>"); 673 MODULE_AUTHOR("Crt Mori <cmo@melexis.com>"); 674 MODULE_DESCRIPTION("Melexis MLX90614 contactless IR temperature sensor driver"); 675 MODULE_LICENSE("GPL"); 676