// SPDX-License-Identifier: GPL-2.0-only

  /*
   *  Driver for the ADT7411 (I2C/SPI 8 channel 10 bit ADC & temperature-sensor)
   *
   *  Copyright (C) 2008, 2010 Pengutronix
   *

   *  TODO: SPI, use power-down mode for suspend?, interrupt handling?

   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/err.h>

  #include <linux/mutex.h>
  #include <linux/jiffies.h>
  #include <linux/i2c.h>
  #include <linux/hwmon.h>
  #include <linux/hwmon-sysfs.h>

  #include <linux/slab.h>

  #define ADT7411_REG_STAT_1			0x00
  #define ADT7411_STAT_1_INT_TEMP_HIGH		BIT(0)
  #define ADT7411_STAT_1_INT_TEMP_LOW		BIT(1)
  #define ADT7411_STAT_1_EXT_TEMP_HIGH_AIN1	BIT(2)
  #define ADT7411_STAT_1_EXT_TEMP_LOW		BIT(3)
  #define ADT7411_STAT_1_EXT_TEMP_FAULT		BIT(4)
  #define ADT7411_STAT_1_AIN2			BIT(5)
  #define ADT7411_STAT_1_AIN3			BIT(6)
  #define ADT7411_STAT_1_AIN4			BIT(7)
  #define ADT7411_REG_STAT_2			0x01
  #define ADT7411_STAT_2_AIN5			BIT(0)
  #define ADT7411_STAT_2_AIN6			BIT(1)
  #define ADT7411_STAT_2_AIN7			BIT(2)
  #define ADT7411_STAT_2_AIN8			BIT(3)
  #define ADT7411_STAT_2_VDD			BIT(4)

  #define ADT7411_REG_INT_TEMP_VDD_LSB		0x03
  #define ADT7411_REG_EXT_TEMP_AIN14_LSB		0x04
  #define ADT7411_REG_VDD_MSB			0x06
  #define ADT7411_REG_INT_TEMP_MSB		0x07
  #define ADT7411_REG_EXT_TEMP_AIN1_MSB		0x08
  
  #define ADT7411_REG_CFG1			0x18

  #define ADT7411_CFG1_START_MONITOR		BIT(0)
  #define ADT7411_CFG1_RESERVED_BIT1		BIT(1)
  #define ADT7411_CFG1_EXT_TDM			BIT(2)
  #define ADT7411_CFG1_RESERVED_BIT3		BIT(3)

  
  #define ADT7411_REG_CFG2			0x19

  #define ADT7411_CFG2_DISABLE_AVG		BIT(5)

  
  #define ADT7411_REG_CFG3			0x1a

  #define ADT7411_CFG3_ADC_CLK_225		BIT(0)
  #define ADT7411_CFG3_RESERVED_BIT1		BIT(1)
  #define ADT7411_CFG3_RESERVED_BIT2		BIT(2)
  #define ADT7411_CFG3_RESERVED_BIT3		BIT(3)
  #define ADT7411_CFG3_REF_VDD			BIT(4)
  
  #define ADT7411_REG_VDD_HIGH			0x23
  #define ADT7411_REG_VDD_LOW			0x24
  #define ADT7411_REG_TEMP_HIGH(nr)		(0x25 + 2 * (nr))
  #define ADT7411_REG_TEMP_LOW(nr)		(0x26 + 2 * (nr))
  #define ADT7411_REG_IN_HIGH(nr)		((nr) > 1 \
  						  ? 0x2b + 2 * ((nr)-2) \
  						  : 0x27)
  #define ADT7411_REG_IN_LOW(nr)			((nr) > 1 \
  						  ? 0x2c + 2 * ((nr)-2) \
  						  : 0x28)

  
  #define ADT7411_REG_DEVICE_ID			0x4d
  #define ADT7411_REG_MANUFACTURER_ID		0x4e
  
  #define ADT7411_DEVICE_ID			0x2
  #define ADT7411_MANUFACTURER_ID			0x41
  
  static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END };

  static const u8 adt7411_in_alarm_reg[] = {
  	ADT7411_REG_STAT_2,
  	ADT7411_REG_STAT_1,
  	ADT7411_REG_STAT_1,
  	ADT7411_REG_STAT_1,
  	ADT7411_REG_STAT_1,
  	ADT7411_REG_STAT_2,
  	ADT7411_REG_STAT_2,
  	ADT7411_REG_STAT_2,
  	ADT7411_REG_STAT_2,
  };
  
  static const u8 adt7411_in_alarm_bits[] = {
  	ADT7411_STAT_2_VDD,
  	ADT7411_STAT_1_EXT_TEMP_HIGH_AIN1,
  	ADT7411_STAT_1_AIN2,
  	ADT7411_STAT_1_AIN3,
  	ADT7411_STAT_1_AIN4,
  	ADT7411_STAT_2_AIN5,
  	ADT7411_STAT_2_AIN6,
  	ADT7411_STAT_2_AIN7,
  	ADT7411_STAT_2_AIN8,
  };

  struct adt7411_data {
  	struct mutex device_lock;	/* for "atomic" device accesses */

  	struct mutex update_lock;

  	unsigned long next_update;

  	long vref_cached;

  	struct i2c_client *client;

  	bool use_ext_temp;

  };
  
  /*
   * When reading a register containing (up to 4) lsb, all associated
   * msb-registers get locked by the hardware. After _one_ of those msb is read,
   * _all_ are unlocked. In order to use this locking correctly, reading lsb/msb
   * is protected here with a mutex, too.
   */
  static int adt7411_read_10_bit(struct i2c_client *client, u8 lsb_reg,
  				u8 msb_reg, u8 lsb_shift)
  {
  	struct adt7411_data *data = i2c_get_clientdata(client);
  	int val, tmp;
  
  	mutex_lock(&data->device_lock);
  
  	val = i2c_smbus_read_byte_data(client, lsb_reg);
  	if (val < 0)
  		goto exit_unlock;
  
  	tmp = (val >> lsb_shift) & 3;
  	val = i2c_smbus_read_byte_data(client, msb_reg);
  
  	if (val >= 0)
  		val = (val << 2) | tmp;
  
   exit_unlock:
  	mutex_unlock(&data->device_lock);
  
  	return val;
  }
  
  static int adt7411_modify_bit(struct i2c_client *client, u8 reg, u8 bit,
  				bool flag)
  {
  	struct adt7411_data *data = i2c_get_clientdata(client);
  	int ret, val;
  
  	mutex_lock(&data->device_lock);
  
  	ret = i2c_smbus_read_byte_data(client, reg);
  	if (ret < 0)
  		goto exit_unlock;
  
  	if (flag)
  		val = ret | bit;
  	else
  		val = ret & ~bit;
  
  	ret = i2c_smbus_write_byte_data(client, reg, val);
  
   exit_unlock:
  	mutex_unlock(&data->device_lock);
  	return ret;
  }

  static ssize_t adt7411_show_bit(struct device *dev,
  				struct device_attribute *attr, char *buf)
  {
  	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);

  	struct adt7411_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;

  	int ret = i2c_smbus_read_byte_data(client, attr2->index);
  
  	return ret < 0 ? ret : sprintf(buf, "%u
  ", !!(ret & attr2->nr));
  }
  
  static ssize_t adt7411_set_bit(struct device *dev,
  			       struct device_attribute *attr, const char *buf,
  			       size_t count)
  {
  	struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr);

  	struct adt7411_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;

  	int ret;
  	unsigned long flag;

  	ret = kstrtoul(buf, 0, &flag);

  	if (ret || flag > 1)
  		return -EINVAL;
  
  	ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag);
  
  	/* force update */

  	mutex_lock(&data->update_lock);

  	data->next_update = jiffies;

  	mutex_unlock(&data->update_lock);

  
  	return ret < 0 ? ret : count;
  }
  
  #define ADT7411_BIT_ATTR(__name, __reg, __bit) \
  	SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \
  	adt7411_set_bit, __bit, __reg)

  static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG);
  static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225);
  static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD);
  
  static struct attribute *adt7411_attrs[] = {

  	&sensor_dev_attr_no_average.dev_attr.attr,
  	&sensor_dev_attr_fast_sampling.dev_attr.attr,
  	&sensor_dev_attr_adc_ref_vdd.dev_attr.attr,
  	NULL
  };

  ATTRIBUTE_GROUPS(adt7411);

  static int adt7411_read_in_alarm(struct device *dev, int channel, long *val)
  {
  	struct adt7411_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;
  	int ret;
  
  	ret = i2c_smbus_read_byte_data(client, adt7411_in_alarm_reg[channel]);
  	if (ret < 0)
  		return ret;
  	*val = !!(ret & adt7411_in_alarm_bits[channel]);
  	return 0;
  }

  static int adt7411_read_in_vdd(struct device *dev, u32 attr, long *val)

  {

  	struct adt7411_data *data = dev_get_drvdata(dev);

  	struct i2c_client *client = data->client;
  	int ret;

  	switch (attr) {
  	case hwmon_in_input:
  		ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
  					  ADT7411_REG_VDD_MSB, 2);
  		if (ret < 0)
  			return ret;
  		*val = ret * 7000 / 1024;
  		return 0;

  	case hwmon_in_min:
  		ret = i2c_smbus_read_byte_data(client, ADT7411_REG_VDD_LOW);
  		if (ret < 0)
  			return ret;
  		*val = ret * 7000 / 256;
  		return 0;
  	case hwmon_in_max:
  		ret = i2c_smbus_read_byte_data(client, ADT7411_REG_VDD_HIGH);
  		if (ret < 0)
  			return ret;
  		*val = ret * 7000 / 256;
  		return 0;
  	case hwmon_in_alarm:
  		return adt7411_read_in_alarm(dev, 0, val);

  	default:
  		return -EOPNOTSUPP;
  	}
  }

  static int adt7411_update_vref(struct device *dev)

  {
  	struct adt7411_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;

  	int val;

  	if (time_after_eq(jiffies, data->next_update)) {

  		val = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3);
  		if (val < 0)
  			return val;

  		if (val & ADT7411_CFG3_REF_VDD) {
  			val = adt7411_read_in_vdd(dev, hwmon_in_input,

  						  &data->vref_cached);

  			if (val < 0)
  				return val;

  		} else {
  			data->vref_cached = 2250;
  		}
  
  		data->next_update = jiffies + HZ;
  	}

  	return 0;
  }
  
  static int adt7411_read_in_chan(struct device *dev, u32 attr, int channel,
  				long *val)
  {
  	struct adt7411_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;
  
  	int ret;
  	int reg, lsb_reg, lsb_shift;
  	int nr = channel - 1;
  
  	mutex_lock(&data->update_lock);
  	ret = adt7411_update_vref(dev);
  	if (ret < 0)
  		goto exit_unlock;

  	switch (attr) {
  	case hwmon_in_input:
  		lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2);
  		lsb_shift = 2 * (nr & 0x03);
  		ret = adt7411_read_10_bit(client, lsb_reg,
  					  ADT7411_REG_EXT_TEMP_AIN1_MSB + nr,
  					  lsb_shift);
  		if (ret < 0)
  			goto exit_unlock;
  		*val = ret * data->vref_cached / 1024;
  		ret = 0;
  		break;

  	case hwmon_in_min:
  	case hwmon_in_max:
  		reg = (attr == hwmon_in_min)
  			? ADT7411_REG_IN_LOW(channel)
  			: ADT7411_REG_IN_HIGH(channel);
  		ret = i2c_smbus_read_byte_data(client, reg);
  		if (ret < 0)
  			goto exit_unlock;
  		*val = ret * data->vref_cached / 256;
  		ret = 0;
  		break;
  	case hwmon_in_alarm:
  		ret = adt7411_read_in_alarm(dev, channel, val);
  		break;

  	default:
  		ret = -EOPNOTSUPP;
  		break;
  	}
   exit_unlock:
  	mutex_unlock(&data->update_lock);
  	return ret;

  }

  static int adt7411_read_in(struct device *dev, u32 attr, int channel,
  			   long *val)
  {
  	if (channel == 0)
  		return adt7411_read_in_vdd(dev, attr, val);
  	else
  		return adt7411_read_in_chan(dev, attr, channel, val);
  }

  
  static int adt7411_read_temp_alarm(struct device *dev, u32 attr, int channel,
  				   long *val)
  {
  	struct adt7411_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;
  	int ret, bit;
  
  	ret = i2c_smbus_read_byte_data(client, ADT7411_REG_STAT_1);
  	if (ret < 0)
  		return ret;
  
  	switch (attr) {
  	case hwmon_temp_min_alarm:
  		bit = channel ? ADT7411_STAT_1_EXT_TEMP_LOW
  			      : ADT7411_STAT_1_INT_TEMP_LOW;
  		break;
  	case hwmon_temp_max_alarm:
  		bit = channel ? ADT7411_STAT_1_EXT_TEMP_HIGH_AIN1
  			      : ADT7411_STAT_1_INT_TEMP_HIGH;
  		break;
  	case hwmon_temp_fault:
  		bit = ADT7411_STAT_1_EXT_TEMP_FAULT;
  		break;
  	default:
  		return -EOPNOTSUPP;
  	}
  
  	*val = !!(ret & bit);
  	return 0;
  }

  static int adt7411_read_temp(struct device *dev, u32 attr, int channel,
  			     long *val)
  {
  	struct adt7411_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;

  	int ret, reg, regl, regh;

  
  	switch (attr) {
  	case hwmon_temp_input:
  		regl = channel ? ADT7411_REG_EXT_TEMP_AIN14_LSB :
  				 ADT7411_REG_INT_TEMP_VDD_LSB;
  		regh = channel ? ADT7411_REG_EXT_TEMP_AIN1_MSB :
  				 ADT7411_REG_INT_TEMP_MSB;
  		ret = adt7411_read_10_bit(client, regl, regh, 0);
  		if (ret < 0)
  			return ret;
  		ret = ret & 0x200 ? ret - 0x400 : ret; /* 10 bit signed */
  		*val = ret * 250;
  		return 0;

  	case hwmon_temp_min:
  	case hwmon_temp_max:
  		reg = (attr == hwmon_temp_min)
  			? ADT7411_REG_TEMP_LOW(channel)
  			: ADT7411_REG_TEMP_HIGH(channel);
  		ret = i2c_smbus_read_byte_data(client, reg);
  		if (ret < 0)
  			return ret;
  		ret = ret & 0x80 ? ret - 0x100 : ret; /* 8 bit signed */
  		*val = ret * 1000;
  		return 0;
  	case hwmon_temp_min_alarm:
  	case hwmon_temp_max_alarm:
  	case hwmon_temp_fault:
  		return adt7411_read_temp_alarm(dev, attr, channel, val);

  	default:
  		return -EOPNOTSUPP;
  	}
  }
  
  static int adt7411_read(struct device *dev, enum hwmon_sensor_types type,
  			u32 attr, int channel, long *val)
  {
  	switch (type) {
  	case hwmon_in:
  		return adt7411_read_in(dev, attr, channel, val);
  	case hwmon_temp:
  		return adt7411_read_temp(dev, attr, channel, val);
  	default:
  		return -EOPNOTSUPP;
  	}
  }

  static int adt7411_write_in_vdd(struct device *dev, u32 attr, long val)
  {
  	struct adt7411_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;
  	int reg;
  
  	val = clamp_val(val, 0, 255 * 7000 / 256);
  	val = DIV_ROUND_CLOSEST(val * 256, 7000);
  
  	switch (attr) {
  	case hwmon_in_min:
  		reg = ADT7411_REG_VDD_LOW;
  		break;
  	case hwmon_in_max:
  		reg = ADT7411_REG_VDD_HIGH;
  		break;
  	default:
  		return -EOPNOTSUPP;
  	}
  
  	return i2c_smbus_write_byte_data(client, reg, val);
  }
  
  static int adt7411_write_in_chan(struct device *dev, u32 attr, int channel,
  				 long val)
  {
  	struct adt7411_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;
  	int ret, reg;
  
  	mutex_lock(&data->update_lock);
  	ret = adt7411_update_vref(dev);
  	if (ret < 0)
  		goto exit_unlock;
  	val = clamp_val(val, 0, 255 * data->vref_cached / 256);
  	val = DIV_ROUND_CLOSEST(val * 256, data->vref_cached);
  
  	switch (attr) {
  	case hwmon_in_min:
  		reg = ADT7411_REG_IN_LOW(channel);
  		break;
  	case hwmon_in_max:
  		reg = ADT7411_REG_IN_HIGH(channel);
  		break;
  	default:
  		ret = -EOPNOTSUPP;
  		goto exit_unlock;
  	}
  
  	ret = i2c_smbus_write_byte_data(client, reg, val);
   exit_unlock:
  	mutex_unlock(&data->update_lock);
  	return ret;
  }
  
  static int adt7411_write_in(struct device *dev, u32 attr, int channel,
  			    long val)
  {
  	if (channel == 0)
  		return adt7411_write_in_vdd(dev, attr, val);
  	else
  		return adt7411_write_in_chan(dev, attr, channel, val);
  }
  
  static int adt7411_write_temp(struct device *dev, u32 attr, int channel,
  			      long val)
  {
  	struct adt7411_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;
  	int reg;
  
  	val = clamp_val(val, -128000, 127000);
  	val = DIV_ROUND_CLOSEST(val, 1000);
  
  	switch (attr) {
  	case hwmon_temp_min:
  		reg = ADT7411_REG_TEMP_LOW(channel);
  		break;
  	case hwmon_temp_max:
  		reg = ADT7411_REG_TEMP_HIGH(channel);
  		break;
  	default:
  		return -EOPNOTSUPP;
  	}
  
  	return i2c_smbus_write_byte_data(client, reg, val);
  }
  
  static int adt7411_write(struct device *dev, enum hwmon_sensor_types type,
  			 u32 attr, int channel, long val)
  {
  	switch (type) {
  	case hwmon_in:
  		return adt7411_write_in(dev, attr, channel, val);
  	case hwmon_temp:
  		return adt7411_write_temp(dev, attr, channel, val);
  	default:
  		return -EOPNOTSUPP;
  	}
  }

  static umode_t adt7411_is_visible(const void *_data,
  				  enum hwmon_sensor_types type,
  				  u32 attr, int channel)
  {
  	const struct adt7411_data *data = _data;

  	bool visible;

  
  	switch (type) {
  	case hwmon_in:

  		visible = channel == 0 || channel >= 3 || !data->use_ext_temp;
  		switch (attr) {
  		case hwmon_in_input:
  		case hwmon_in_alarm:
  			return visible ? S_IRUGO : 0;
  		case hwmon_in_min:
  		case hwmon_in_max:
  			return visible ? S_IRUGO | S_IWUSR : 0;
  		}
  		break;

  	case hwmon_temp:

  		visible = channel == 0 || data->use_ext_temp;
  		switch (attr) {
  		case hwmon_temp_input:
  		case hwmon_temp_min_alarm:
  		case hwmon_temp_max_alarm:
  		case hwmon_temp_fault:
  			return visible ? S_IRUGO : 0;
  		case hwmon_temp_min:
  		case hwmon_temp_max:
  			return visible ? S_IRUGO | S_IWUSR : 0;
  		}
  		break;

  	default:

  		break;

  	}

  	return 0;

  }

  
  static int adt7411_detect(struct i2c_client *client,
  			  struct i2c_board_info *info)
  {
  	int val;
  
  	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
  		return -ENODEV;
  
  	val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID);
  	if (val < 0 || val != ADT7411_MANUFACTURER_ID) {

  		dev_dbg(&client->dev,
  			"Wrong manufacturer ID. Got %d, expected %d
  ",
  			val, ADT7411_MANUFACTURER_ID);

  		return -ENODEV;
  	}
  
  	val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID);
  	if (val < 0 || val != ADT7411_DEVICE_ID) {

  		dev_dbg(&client->dev,
  			"Wrong device ID. Got %d, expected %d
  ",
  			val, ADT7411_DEVICE_ID);

  		return -ENODEV;
  	}
  
  	strlcpy(info->type, "adt7411", I2C_NAME_SIZE);
  
  	return 0;
  }

  static int adt7411_init_device(struct adt7411_data *data)
  {
  	int ret;
  	u8 val;
  
  	ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG3);
  	if (ret < 0)
  		return ret;
  
  	/*
  	 * We must only write zero to bit 1 and bit 2 and only one to bit 3
  	 * according to the datasheet.
  	 */
  	val = ret;
  	val &= ~(ADT7411_CFG3_RESERVED_BIT1 | ADT7411_CFG3_RESERVED_BIT2);
  	val |= ADT7411_CFG3_RESERVED_BIT3;
  
  	ret = i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG3, val);
  	if (ret < 0)
  		return ret;
  
  	ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG1);
  	if (ret < 0)
  		return ret;

  	data->use_ext_temp = ret & ADT7411_CFG1_EXT_TDM;

  	/*
  	 * We must only write zero to bit 1 and only one to bit 3 according to
  	 * the datasheet.
  	 */
  	val = ret;
  	val &= ~ADT7411_CFG1_RESERVED_BIT1;
  	val |= ADT7411_CFG1_RESERVED_BIT3;
  
  	/* enable monitoring */
  	val |= ADT7411_CFG1_START_MONITOR;
  
  	return i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG1, val);
  }

  static const struct hwmon_channel_info *adt7411_info[] = {

  	HWMON_CHANNEL_INFO(in,
  			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
  			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
  			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
  			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
  			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
  			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
  			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
  			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
  			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM),
  	HWMON_CHANNEL_INFO(temp,
  			   HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MIN_ALARM |
  			   HWMON_T_MAX | HWMON_T_MAX_ALARM,
  			   HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MIN_ALARM |
  			   HWMON_T_MAX | HWMON_T_MAX_ALARM | HWMON_T_FAULT),

  	NULL
  };
  
  static const struct hwmon_ops adt7411_hwmon_ops = {
  	.is_visible = adt7411_is_visible,
  	.read = adt7411_read,

  	.write = adt7411_write,

  };
  
  static const struct hwmon_chip_info adt7411_chip_info = {
  	.ops = &adt7411_hwmon_ops,
  	.info = adt7411_info,
  };

  static int adt7411_probe(struct i2c_client *client)

  {

  	struct device *dev = &client->dev;

  	struct adt7411_data *data;

  	struct device *hwmon_dev;

  	int ret;

  	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);

  	if (!data)
  		return -ENOMEM;
  
  	i2c_set_clientdata(client, data);

  	data->client = client;

  	mutex_init(&data->device_lock);

  	mutex_init(&data->update_lock);

  	ret = adt7411_init_device(data);

  	if (ret < 0)

  		return ret;

  
  	/* force update on first occasion */
  	data->next_update = jiffies;

  	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
  							 data,
  							 &adt7411_chip_info,
  							 adt7411_groups);

  	return PTR_ERR_OR_ZERO(hwmon_dev);

  }
  
  static const struct i2c_device_id adt7411_id[] = {
  	{ "adt7411", 0 },
  	{ }
  };

  MODULE_DEVICE_TABLE(i2c, adt7411_id);

  
  static struct i2c_driver adt7411_driver = {
  	.driver		= {
  		.name		= "adt7411",
  	},

  	.probe_new = adt7411_probe,

  	.id_table = adt7411_id,
  	.detect = adt7411_detect,
  	.address_list = normal_i2c,
  	.class = I2C_CLASS_HWMON,
  };

  module_i2c_driver(adt7411_driver);

  MODULE_AUTHOR("Sascha Hauer, Wolfram Sang <kernel@pengutronix.de>");

  MODULE_DESCRIPTION("ADT7411 driver");
  MODULE_LICENSE("GPL v2");