text: // SPDX-License-Identifier: GPL-2.0-only
  /*
   * mlx90614.c - Support for Melexis MLX90614 contactless IR temperature sensor
   *
   * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
   * Copyright (c) 2015 Essensium NV
   * Copyright (c) 2015 Melexis
   *
   * Driver for the Melexis MLX90614 I2C 16-bit IR thermopile sensor
   *
   * (7-bit I2C slave address 0x5a, 100KHz bus speed only!)
   *
   * To wake up from sleep mode, the SDA line must be held low while SCL is high
   * for at least 33ms.  This is achieved with an extra GPIO that can be connected
   * directly to the SDA line.  In normal operation, the GPIO is set as input and
   * will not interfere in I2C communication.  While the GPIO is driven low, the
   * i2c adapter is locked since it cannot be used by other clients.  The SCL line
   * always has a pull-up so we do not need an extra GPIO to drive it high.  If
   * the "wakeup" GPIO is not given, power management will be disabled.
   */
  
  #include <linux/err.h>
  #include <linux/i2c.h>
  #include <linux/module.h>
  #include <linux/delay.h>
  #include <linux/jiffies.h>
  #include <linux/gpio/consumer.h>
  #include <linux/pm_runtime.h>
  
  #include <linux/iio/iio.h>
  #include <linux/iio/sysfs.h>
  
  #define MLX90614_OP_RAM		0x00
  #define MLX90614_OP_EEPROM	0x20
  #define MLX90614_OP_SLEEP	0xff
  
  /* RAM offsets with 16-bit data, MSB first */
  #define MLX90614_RAW1	(MLX90614_OP_RAM | 0x04) /* raw data IR channel 1 */
  #define MLX90614_RAW2	(MLX90614_OP_RAM | 0x05) /* raw data IR channel 2 */
  #define MLX90614_TA	(MLX90614_OP_RAM | 0x06) /* ambient temperature */
  #define MLX90614_TOBJ1	(MLX90614_OP_RAM | 0x07) /* object 1 temperature */
  #define MLX90614_TOBJ2	(MLX90614_OP_RAM | 0x08) /* object 2 temperature */
  
  /* EEPROM offsets with 16-bit data, MSB first */
  #define MLX90614_EMISSIVITY	(MLX90614_OP_EEPROM | 0x04) /* emissivity correction coefficient */
  #define MLX90614_CONFIG		(MLX90614_OP_EEPROM | 0x05) /* configuration register */
  
  /* Control bits in configuration register */
  #define MLX90614_CONFIG_IIR_SHIFT 0 /* IIR coefficient */
  #define MLX90614_CONFIG_IIR_MASK (0x7 << MLX90614_CONFIG_IIR_SHIFT)
  #define MLX90614_CONFIG_DUAL_SHIFT 6 /* single (0) or dual (1) IR sensor */
  #define MLX90614_CONFIG_DUAL_MASK (1 << MLX90614_CONFIG_DUAL_SHIFT)
  #define MLX90614_CONFIG_FIR_SHIFT 8 /* FIR coefficient */
  #define MLX90614_CONFIG_FIR_MASK (0x7 << MLX90614_CONFIG_FIR_SHIFT)
  #define MLX90614_CONFIG_GAIN_SHIFT 11 /* gain */
  #define MLX90614_CONFIG_GAIN_MASK (0x7 << MLX90614_CONFIG_GAIN_SHIFT)
  
  /* Timings (in ms) */
  #define MLX90614_TIMING_EEPROM 20 /* time for EEPROM write/erase to complete */
  #define MLX90614_TIMING_WAKEUP 34 /* time to hold SDA low for wake-up */
  #define MLX90614_TIMING_STARTUP 250 /* time before first data after wake-up */
  
  #define MLX90614_AUTOSLEEP_DELAY 5000 /* default autosleep delay */
  
  /* Magic constants */
  #define MLX90614_CONST_OFFSET_DEC -13657 /* decimal part of the Kelvin offset */
  #define MLX90614_CONST_OFFSET_REM 500000 /* remainder of offset (273.15*50) */
  #define MLX90614_CONST_SCALE 20 /* Scale in milliKelvin (0.02 * 1000) */
  #define MLX90614_CONST_RAW_EMISSIVITY_MAX 65535 /* max value for emissivity */
  #define MLX90614_CONST_EMISSIVITY_RESOLUTION 15259 /* 1/65535 ~ 0.000015259 */
  #define MLX90614_CONST_FIR 0x7 /* Fixed value for FIR part of low pass filter */
  
  struct mlx90614_data {
  	struct i2c_client *client;
  	struct mutex lock; /* for EEPROM access only */
  	struct gpio_desc *wakeup_gpio; /* NULL to disable sleep/wake-up */
  	unsigned long ready_timestamp; /* in jiffies */
  };
  
  /* Bandwidth values for IIR filtering */
  static const int mlx90614_iir_values[] = {77, 31, 20, 15, 723, 153, 110, 86};
  static IIO_CONST_ATTR(in_temp_object_filter_low_pass_3db_frequency_available,
  		      "0.15 0.20 0.31 0.77 0.86 1.10 1.53 7.23");
  
  static struct attribute *mlx90614_attributes[] = {
  	&iio_const_attr_in_temp_object_filter_low_pass_3db_frequency_available.dev_attr.attr,
  	NULL,
  };
  
  static const struct attribute_group mlx90614_attr_group = {
  	.attrs = mlx90614_attributes,
  };
  
  /*
   * Erase an address and write word.
   * The mutex must be locked before calling.
   */
  static s32 mlx90614_write_word(const struct i2c_client *client, u8 command,
  			       u16 value)
  {
  	/*
  	 * Note: The mlx90614 requires a PEC on writing but does not send us a
  	 * valid PEC on reading.  Hence, we cannot set I2C_CLIENT_PEC in
  	 * i2c_client.flags.  As a workaround, we use i2c_smbus_xfer here.
  	 */
  	union i2c_smbus_data data;
  	s32 ret;
  
  	dev_dbg(&client->dev, "Writing 0x%x to address 0x%x", value, command);
  
  	data.word = 0x0000; /* erase command */
  	ret = i2c_smbus_xfer(client->adapter, client->addr,
  			     client->flags | I2C_CLIENT_PEC,
  			     I2C_SMBUS_WRITE, command,
  			     I2C_SMBUS_WORD_DATA, &data);
  	if (ret < 0)
  		return ret;
  
  	msleep(MLX90614_TIMING_EEPROM);
  
  	data.word = value; /* actual write */
  	ret = i2c_smbus_xfer(client->adapter, client->addr,
  			     client->flags | I2C_CLIENT_PEC,
  			     I2C_SMBUS_WRITE, command,
  			     I2C_SMBUS_WORD_DATA, &data);
  
  	msleep(MLX90614_TIMING_EEPROM);
  
  	return ret;
  }
  
  /*
   * Find the IIR value inside mlx90614_iir_values array and return its position
   * which is equivalent to the bit value in sensor register
   */
  static inline s32 mlx90614_iir_search(const struct i2c_client *client,
  				      int value)
  {
  	int i;
  	s32 ret;
  
  	for (i = 0; i < ARRAY_SIZE(mlx90614_iir_values); ++i) {
  		if (value == mlx90614_iir_values[i])
  			break;
  	}
  
  	if (i == ARRAY_SIZE(mlx90614_iir_values))
  		return -EINVAL;
  
  	/*
  	 * CONFIG register values must not be changed so
  	 * we must read them before we actually write
  	 * changes
  	 */
  	ret = i2c_smbus_read_word_data(client, MLX90614_CONFIG);
  	if (ret < 0)
  		return ret;
  
  	ret &= ~MLX90614_CONFIG_FIR_MASK;
  	ret |= MLX90614_CONST_FIR << MLX90614_CONFIG_FIR_SHIFT;
  	ret &= ~MLX90614_CONFIG_IIR_MASK;
  	ret |= i << MLX90614_CONFIG_IIR_SHIFT;
  
  	/* Write changed values */
  	ret = mlx90614_write_word(client, MLX90614_CONFIG, ret);
  	return ret;
  }
  
  #ifdef CONFIG_PM
  /*
   * If @startup is true, make sure MLX90614_TIMING_STARTUP ms have elapsed since
   * the last wake-up.  This is normally only needed to get a valid temperature
   * reading.  EEPROM access does not need such delay.
   * Return 0 on success, <0 on error.
   */
  static int mlx90614_power_get(struct mlx90614_data *data, bool startup)
  {
  	unsigned long now;
  
  	if (!data->wakeup_gpio)
  		return 0;
  
  	pm_runtime_get_sync(&data->client->dev);
  
  	if (startup) {
  		now = jiffies;
  		if (time_before(now, data->ready_timestamp) &&
  		    msleep_interruptible(jiffies_to_msecs(
  				data->ready_timestamp - now)) != 0) {
  			pm_runtime_put_autosuspend(&data->client->dev);
  			return -EINTR;
  		}
  	}
  
  	return 0;
  }
  
  static void mlx90614_power_put(struct mlx90614_data *data)
  {
  	if (!data->wakeup_gpio)
  		return;
  
  	pm_runtime_mark_last_busy(&data->client->dev);
  	pm_runtime_put_autosuspend(&data->client->dev);
  }
  #else
  static inline int mlx90614_power_get(struct mlx90614_data *data, bool startup)
  {
  	return 0;
  }
  
  static inline void mlx90614_power_put(struct mlx90614_data *data)
  {
  }
  #endif
  
  static int mlx90614_read_raw(struct iio_dev *indio_dev,
  			    struct iio_chan_spec const *channel, int *val,
  			    int *val2, long mask)
  {
  	struct mlx90614_data *data = iio_priv(indio_dev);
  	u8 cmd;
  	s32 ret;
  
  	switch (mask) {
  	case IIO_CHAN_INFO_RAW: /* 0.02K / LSB */
  		switch (channel->channel2) {
  		case IIO_MOD_TEMP_AMBIENT:
  			cmd = MLX90614_TA;
  			break;
  		case IIO_MOD_TEMP_OBJECT:
  			switch (channel->channel) {
  			case 0:
  				cmd = MLX90614_TOBJ1;
  				break;
  			case 1:
  				cmd = MLX90614_TOBJ2;
  				break;
  			default:
  				return -EINVAL;
  			}
  			break;
  		default:
  			return -EINVAL;
  		}
  
  		ret = mlx90614_power_get(data, true);
  		if (ret < 0)
  			return ret;
  		ret = i2c_smbus_read_word_data(data->client, cmd);
  		mlx90614_power_put(data);
  
  		if (ret < 0)
  			return ret;
  
  		/* MSB is an error flag */
  		if (ret & 0x8000)
  			return -EIO;
  
  		*val = ret;
  		return IIO_VAL_INT;
  	case IIO_CHAN_INFO_OFFSET:
  		*val = MLX90614_CONST_OFFSET_DEC;
  		*val2 = MLX90614_CONST_OFFSET_REM;
  		return IIO_VAL_INT_PLUS_MICRO;
  	case IIO_CHAN_INFO_SCALE:
  		*val = MLX90614_CONST_SCALE;
  		return IIO_VAL_INT;
  	case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/65535 / LSB */
  		mlx90614_power_get(data, false);
  		mutex_lock(&data->lock);
  		ret = i2c_smbus_read_word_data(data->client,
  					       MLX90614_EMISSIVITY);
  		mutex_unlock(&data->lock);
  		mlx90614_power_put(data);
  
  		if (ret < 0)
  			return ret;
  
  		if (ret == MLX90614_CONST_RAW_EMISSIVITY_MAX) {
  			*val = 1;
  			*val2 = 0;
  		} else {
  			*val = 0;
  			*val2 = ret * MLX90614_CONST_EMISSIVITY_RESOLUTION;
  		}
  		return IIO_VAL_INT_PLUS_NANO;
  	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR setting with
  							     FIR = 1024 */
  		mlx90614_power_get(data, false);
  		mutex_lock(&data->lock);
  		ret = i2c_smbus_read_word_data(data->client, MLX90614_CONFIG);
  		mutex_unlock(&data->lock);
  		mlx90614_power_put(data);
  
  		if (ret < 0)
  			return ret;
  
  		*val = mlx90614_iir_values[ret & MLX90614_CONFIG_IIR_MASK] / 100;
  		*val2 = (mlx90614_iir_values[ret & MLX90614_CONFIG_IIR_MASK] % 100) *
  			10000;
  		return IIO_VAL_INT_PLUS_MICRO;
  	default:
  		return -EINVAL;
  	}
  }
  
  static int mlx90614_write_raw(struct iio_dev *indio_dev,
  			     struct iio_chan_spec const *channel, int val,
  			     int val2, long mask)
  {
  	struct mlx90614_data *data = iio_priv(indio_dev);
  	s32 ret;
  
  	switch (mask) {
  	case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/65535 / LSB */
  		if (val < 0 || val2 < 0 || val > 1 || (val == 1 && val2 != 0))
  			return -EINVAL;
  		val = val * MLX90614_CONST_RAW_EMISSIVITY_MAX +
  			val2 / MLX90614_CONST_EMISSIVITY_RESOLUTION;
  
  		mlx90614_power_get(data, false);
  		mutex_lock(&data->lock);
  		ret = mlx90614_write_word(data->client, MLX90614_EMISSIVITY,
  					  val);
  		mutex_unlock(&data->lock);
  		mlx90614_power_put(data);
  
  		return ret;
  	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR Filter setting */
  		if (val < 0 || val2 < 0)
  			return -EINVAL;
  
  		mlx90614_power_get(data, false);
  		mutex_lock(&data->lock);
  		ret = mlx90614_iir_search(data->client,
  					  val * 100 + val2 / 10000);
  		mutex_unlock(&data->lock);
  		mlx90614_power_put(data);
  
  		return ret;
  	default:
  		return -EINVAL;
  	}
  }
  
  static int mlx90614_write_raw_get_fmt(struct iio_dev *indio_dev,
  				     struct iio_chan_spec const *channel,
  				     long mask)
  {
  	switch (mask) {
  	case IIO_CHAN_INFO_CALIBEMISSIVITY:
  		return IIO_VAL_INT_PLUS_NANO;
  	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
  		return IIO_VAL_INT_PLUS_MICRO;
  	default:
  		return -EINVAL;
  	}
  }
  
  static const struct iio_chan_spec mlx90614_channels[] = {
  	{
  		.type = IIO_TEMP,
  		.modified = 1,
  		.channel2 = IIO_MOD_TEMP_AMBIENT,
  		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  		    BIT(IIO_CHAN_INFO_SCALE),
  	},
  	{
  		.type = IIO_TEMP,
  		.modified = 1,
  		.channel2 = IIO_MOD_TEMP_OBJECT,
  		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
  		    BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) |
  			BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
  		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  		    BIT(IIO_CHAN_INFO_SCALE),
  	},
  	{
  		.type = IIO_TEMP,
  		.indexed = 1,
  		.modified = 1,
  		.channel = 1,
  		.channel2 = IIO_MOD_TEMP_OBJECT,
  		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
  		    BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) |
  			BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
  		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  		    BIT(IIO_CHAN_INFO_SCALE),
  	},
  };
  
  static const struct iio_info mlx90614_info = {
  	.read_raw = mlx90614_read_raw,
  	.write_raw = mlx90614_write_raw,
  	.write_raw_get_fmt = mlx90614_write_raw_get_fmt,
  	.attrs = &mlx90614_attr_group,
  };
  
  #ifdef CONFIG_PM
  static int mlx90614_sleep(struct mlx90614_data *data)
  {
  	s32 ret;
  
  	if (!data->wakeup_gpio) {
  		dev_dbg(&data->client->dev, "Sleep disabled");
  		return -ENOSYS;
  	}
  
  	dev_dbg(&data->client->dev, "Requesting sleep");
  
  	mutex_lock(&data->lock);
  	ret = i2c_smbus_xfer(data->client->adapter, data->client->addr,
  			     data->client->flags | I2C_CLIENT_PEC,
  			     I2C_SMBUS_WRITE, MLX90614_OP_SLEEP,
  			     I2C_SMBUS_BYTE, NULL);
  	mutex_unlock(&data->lock);
  
  	return ret;
  }
  
  static int mlx90614_wakeup(struct mlx90614_data *data)
  {
  	if (!data->wakeup_gpio) {
  		dev_dbg(&data->client->dev, "Wake-up disabled");
  		return -ENOSYS;
  	}
  
  	dev_dbg(&data->client->dev, "Requesting wake-up");
  
  	i2c_lock_bus(data->client->adapter, I2C_LOCK_ROOT_ADAPTER);
  	gpiod_direction_output(data->wakeup_gpio, 0);
  	msleep(MLX90614_TIMING_WAKEUP);
  	gpiod_direction_input(data->wakeup_gpio);
  	i2c_unlock_bus(data->client->adapter, I2C_LOCK_ROOT_ADAPTER);
  
  	data->ready_timestamp = jiffies +
  			msecs_to_jiffies(MLX90614_TIMING_STARTUP);
  
  	/*
  	 * Quirk: the i2c controller may get confused right after the
  	 * wake-up signal has been sent.  As a workaround, do a dummy read.
  	 * If the read fails, the controller will probably be reset so that
  	 * further reads will work.
  	 */
  	i2c_smbus_read_word_data(data->client, MLX90614_CONFIG);
  
  	return 0;
  }
  
  /* Return wake-up GPIO or NULL if sleep functionality should be disabled. */
  static struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client)
  {
  	struct gpio_desc *gpio;
  
  	if (!i2c_check_functionality(client->adapter,
  						I2C_FUNC_SMBUS_WRITE_BYTE)) {
  		dev_info(&client->dev,
  			 "i2c adapter does not support SMBUS_WRITE_BYTE, sleep disabled");
  		return NULL;
  	}
  
  	gpio = devm_gpiod_get_optional(&client->dev, "wakeup", GPIOD_IN);
  
  	if (IS_ERR(gpio)) {
  		dev_warn(&client->dev,
  			 "gpio acquisition failed with error %ld, sleep disabled",
  			 PTR_ERR(gpio));
  		return NULL;
  	} else if (!gpio) {
  		dev_info(&client->dev,
  			 "wakeup-gpio not found, sleep disabled");
  	}
  
  	return gpio;
  }
  #else
  static inline int mlx90614_sleep(struct mlx90614_data *data)
  {
  	return -ENOSYS;
  }
  static inline int mlx90614_wakeup(struct mlx90614_data *data)
  {
  	return -ENOSYS;
  }
  static inline struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client)
  {
  	return NULL;
  }
  #endif
  
  /* Return 0 for single sensor, 1 for dual sensor, <0 on error. */
  static int mlx90614_probe_num_ir_sensors(struct i2c_client *client)
  {
  	s32 ret;
  
  	ret = i2c_smbus_read_word_data(client, MLX90614_CONFIG);
  
  	if (ret < 0)
  		return ret;
  
  	return (ret & MLX90614_CONFIG_DUAL_MASK) ? 1 : 0;
  }
  
  static int mlx90614_probe(struct i2c_client *client,
  			 const struct i2c_device_id *id)
  {
  	struct iio_dev *indio_dev;
  	struct mlx90614_data *data;
  	int ret;
  
  	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
  		return -EOPNOTSUPP;
  
  	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
  	if (!indio_dev)
  		return -ENOMEM;
  
  	data = iio_priv(indio_dev);
  	i2c_set_clientdata(client, indio_dev);
  	data->client = client;
  	mutex_init(&data->lock);
  	data->wakeup_gpio = mlx90614_probe_wakeup(client);
  
  	mlx90614_wakeup(data);
  
  	indio_dev->dev.parent = &client->dev;
  	indio_dev->name = id->name;
  	indio_dev->modes = INDIO_DIRECT_MODE;
  	indio_dev->info = &mlx90614_info;
  
  	ret = mlx90614_probe_num_ir_sensors(client);
  	switch (ret) {
  	case 0:
  		dev_dbg(&client->dev, "Found single sensor");
  		indio_dev->channels = mlx90614_channels;
  		indio_dev->num_channels = 2;
  		break;
  	case 1:
  		dev_dbg(&client->dev, "Found dual sensor");
  		indio_dev->channels = mlx90614_channels;
  		indio_dev->num_channels = 3;
  		break;
  	default:
  		return ret;
  	}
  
  	if (data->wakeup_gpio) {
  		pm_runtime_set_autosuspend_delay(&client->dev,
  						 MLX90614_AUTOSLEEP_DELAY);
  		pm_runtime_use_autosuspend(&client->dev);
  		pm_runtime_set_active(&client->dev);
  		pm_runtime_enable(&client->dev);
  	}
  
  	return iio_device_register(indio_dev);
  }
  
  static int mlx90614_remove(struct i2c_client *client)
  {
  	struct iio_dev *indio_dev = i2c_get_clientdata(client);
  	struct mlx90614_data *data = iio_priv(indio_dev);
  
  	iio_device_unregister(indio_dev);
  
  	if (data->wakeup_gpio) {
  		pm_runtime_disable(&client->dev);
  		if (!pm_runtime_status_suspended(&client->dev))
  			mlx90614_sleep(data);
  		pm_runtime_set_suspended(&client->dev);
  	}
  
  	return 0;
  }
  
  static const struct i2c_device_id mlx90614_id[] = {
  	{ "mlx90614", 0 },
  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, mlx90614_id);
  
  static const struct of_device_id mlx90614_of_match[] = {
  	{ .compatible = "melexis,mlx90614" },
  	{ }
  };
  MODULE_DEVICE_TABLE(of, mlx90614_of_match);
  
  #ifdef CONFIG_PM_SLEEP
  static int mlx90614_pm_suspend(struct device *dev)
  {
  	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
  	struct mlx90614_data *data = iio_priv(indio_dev);
  
  	if (data->wakeup_gpio && pm_runtime_active(dev))
  		return mlx90614_sleep(data);
  
  	return 0;
  }
  
  static int mlx90614_pm_resume(struct device *dev)
  {
  	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
  	struct mlx90614_data *data = iio_priv(indio_dev);
  	int err;
  
  	if (data->wakeup_gpio) {
  		err = mlx90614_wakeup(data);
  		if (err < 0)
  			return err;
  
  		pm_runtime_disable(dev);
  		pm_runtime_set_active(dev);
  		pm_runtime_enable(dev);
  	}
  
  	return 0;
  }
  #endif
  
  #ifdef CONFIG_PM
  static int mlx90614_pm_runtime_suspend(struct device *dev)
  {
  	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
  	struct mlx90614_data *data = iio_priv(indio_dev);
  
  	return mlx90614_sleep(data);
  }
  
  static int mlx90614_pm_runtime_resume(struct device *dev)
  {
  	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
  	struct mlx90614_data *data = iio_priv(indio_dev);
  
  	return mlx90614_wakeup(data);
  }
  #endif
  
  static const struct dev_pm_ops mlx90614_pm_ops = {
  	SET_SYSTEM_SLEEP_PM_OPS(mlx90614_pm_suspend, mlx90614_pm_resume)
  	SET_RUNTIME_PM_OPS(mlx90614_pm_runtime_suspend,
  			   mlx90614_pm_runtime_resume, NULL)
  };
  
  static struct i2c_driver mlx90614_driver = {
  	.driver = {
  		.name	= "mlx90614",
  		.of_match_table = mlx90614_of_match,
  		.pm	= &mlx90614_pm_ops,
  	},
  	.probe = mlx90614_probe,
  	.remove = mlx90614_remove,
  	.id_table = mlx90614_id,
  };
  module_i2c_driver(mlx90614_driver);
  
  MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
  MODULE_AUTHOR("Vianney le Clément de Saint-Marcq <vianney.leclement@essensium.com>");
  MODULE_AUTHOR("Crt Mori <cmo@melexis.com>");
  MODULE_DESCRIPTION("Melexis MLX90614 contactless IR temperature sensor driver");
  MODULE_LICENSE("GPL");
  