/* tmp401.c
   *
   * Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com>
   * Preliminary tmp411 support by:
   * Gabriel Konat, Sander Leget, Wouter Willems
   * Copyright (C) 2009 Andre Prendel <andre.prendel@gmx.de>
   *
   * Cleanup and support for TMP431 and TMP432 by Guenter Roeck
   * Copyright (c) 2013 Guenter Roeck <linux@roeck-us.net>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  /*
   * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC.
   *
   * Note this IC is in some aspect similar to the LM90, but it has quite a
   * few differences too, for example the local temp has a higher resolution
   * and thus has 16 bits registers for its value and limit instead of 8 bits.
   */
  
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/bitops.h>
  #include <linux/slab.h>
  #include <linux/jiffies.h>
  #include <linux/i2c.h>
  #include <linux/hwmon.h>
  #include <linux/hwmon-sysfs.h>
  #include <linux/err.h>
  #include <linux/mutex.h>
  #include <linux/sysfs.h>
  
  /* Addresses to scan */
  static const unsigned short normal_i2c[] = { 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
  
  enum chips { tmp401, tmp411, tmp431, tmp432 };
  
  /*
   * The TMP401 registers, note some registers have different addresses for
   * reading and writing
   */
  #define TMP401_STATUS				0x02
  #define TMP401_CONFIG_READ			0x03
  #define TMP401_CONFIG_WRITE			0x09
  #define TMP401_CONVERSION_RATE_READ		0x04
  #define TMP401_CONVERSION_RATE_WRITE		0x0A
  #define TMP401_TEMP_CRIT_HYST			0x21
  #define TMP401_MANUFACTURER_ID_REG		0xFE
  #define TMP401_DEVICE_ID_REG			0xFF
  
  static const u8 TMP401_TEMP_MSB_READ[6][2] = {
  	{ 0x00, 0x01 },	/* temp */
  	{ 0x06, 0x08 },	/* low limit */
  	{ 0x05, 0x07 },	/* high limit */
  	{ 0x20, 0x19 },	/* therm (crit) limit */
  	{ 0x30, 0x34 },	/* lowest */
  	{ 0x32, 0x36 },	/* highest */
  };
  
  static const u8 TMP401_TEMP_MSB_WRITE[6][2] = {
  	{ 0, 0 },	/* temp (unused) */
  	{ 0x0C, 0x0E },	/* low limit */
  	{ 0x0B, 0x0D },	/* high limit */
  	{ 0x20, 0x19 },	/* therm (crit) limit */
  	{ 0x30, 0x34 },	/* lowest */
  	{ 0x32, 0x36 },	/* highest */
  };
  
  static const u8 TMP401_TEMP_LSB[6][2] = {
  	{ 0x15, 0x10 },	/* temp */
  	{ 0x17, 0x14 },	/* low limit */
  	{ 0x16, 0x13 },	/* high limit */
  	{ 0, 0 },	/* therm (crit) limit (unused) */
  	{ 0x31, 0x35 },	/* lowest */
  	{ 0x33, 0x37 },	/* highest */
  };
  
  static const u8 TMP432_TEMP_MSB_READ[4][3] = {
  	{ 0x00, 0x01, 0x23 },	/* temp */
  	{ 0x06, 0x08, 0x16 },	/* low limit */
  	{ 0x05, 0x07, 0x15 },	/* high limit */
  	{ 0x20, 0x19, 0x1A },	/* therm (crit) limit */
  };
  
  static const u8 TMP432_TEMP_MSB_WRITE[4][3] = {
  	{ 0, 0, 0 },		/* temp  - unused */
  	{ 0x0C, 0x0E, 0x16 },	/* low limit */
  	{ 0x0B, 0x0D, 0x15 },	/* high limit */
  	{ 0x20, 0x19, 0x1A },	/* therm (crit) limit */
  };
  
  static const u8 TMP432_TEMP_LSB[3][3] = {
  	{ 0x29, 0x10, 0x24 },	/* temp */
  	{ 0x3E, 0x14, 0x18 },	/* low limit */
  	{ 0x3D, 0x13, 0x17 },	/* high limit */
  };
  
  /* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */
  static const u8 TMP432_STATUS_REG[] = {
  	0x1b, 0x36, 0x35, 0x37 };
  
  /* Flags */
  #define TMP401_CONFIG_RANGE			BIT(2)
  #define TMP401_CONFIG_SHUTDOWN			BIT(6)
  #define TMP401_STATUS_LOCAL_CRIT		BIT(0)
  #define TMP401_STATUS_REMOTE_CRIT		BIT(1)
  #define TMP401_STATUS_REMOTE_OPEN		BIT(2)
  #define TMP401_STATUS_REMOTE_LOW		BIT(3)
  #define TMP401_STATUS_REMOTE_HIGH		BIT(4)
  #define TMP401_STATUS_LOCAL_LOW			BIT(5)
  #define TMP401_STATUS_LOCAL_HIGH		BIT(6)
  
  /* On TMP432, each status has its own register */
  #define TMP432_STATUS_LOCAL			BIT(0)
  #define TMP432_STATUS_REMOTE1			BIT(1)
  #define TMP432_STATUS_REMOTE2			BIT(2)
  
  /* Manufacturer / Device ID's */
  #define TMP401_MANUFACTURER_ID			0x55
  #define TMP401_DEVICE_ID			0x11
  #define TMP411A_DEVICE_ID			0x12
  #define TMP411B_DEVICE_ID			0x13
  #define TMP411C_DEVICE_ID			0x10
  #define TMP431_DEVICE_ID			0x31
  #define TMP432_DEVICE_ID			0x32
  
  /*
   * Driver data (common to all clients)
   */
  
  static const struct i2c_device_id tmp401_id[] = {
  	{ "tmp401", tmp401 },
  	{ "tmp411", tmp411 },
  	{ "tmp431", tmp431 },
  	{ "tmp432", tmp432 },
  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, tmp401_id);
  
  /*
   * Client data (each client gets its own)
   */
  
  struct tmp401_data {
  	struct i2c_client *client;
  	const struct attribute_group *groups[3];
  	struct mutex update_lock;
  	char valid; /* zero until following fields are valid */
  	unsigned long last_updated; /* in jiffies */
  	enum chips kind;
  
  	unsigned int update_interval;	/* in milliseconds */
  
  	/* register values */
  	u8 status[4];
  	u8 config;
  	u16 temp[6][3];
  	u8 temp_crit_hyst;
  };
  
  /*
   * Sysfs attr show / store functions
   */
  
  static int tmp401_register_to_temp(u16 reg, u8 config)
  {
  	int temp = reg;
  
  	if (config & TMP401_CONFIG_RANGE)
  		temp -= 64 * 256;
  
  	return DIV_ROUND_CLOSEST(temp * 125, 32);
  }
  
  static u16 tmp401_temp_to_register(long temp, u8 config, int zbits)
  {
  	if (config & TMP401_CONFIG_RANGE) {
  		temp = clamp_val(temp, -64000, 191000);
  		temp += 64000;
  	} else
  		temp = clamp_val(temp, 0, 127000);
  
  	return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
  }
  
  static int tmp401_update_device_reg16(struct i2c_client *client,
  				      struct tmp401_data *data)
  {
  	int i, j, val;
  	int num_regs = data->kind == tmp411 ? 6 : 4;
  	int num_sensors = data->kind == tmp432 ? 3 : 2;
  
  	for (i = 0; i < num_sensors; i++) {		/* local / r1 / r2 */
  		for (j = 0; j < num_regs; j++) {	/* temp / low / ... */
  			u8 regaddr;
  			/*
  			 * High byte must be read first immediately followed
  			 * by the low byte
  			 */
  			regaddr = data->kind == tmp432 ?
  						TMP432_TEMP_MSB_READ[j][i] :
  						TMP401_TEMP_MSB_READ[j][i];
  			val = i2c_smbus_read_byte_data(client, regaddr);
  			if (val < 0)
  				return val;
  			data->temp[j][i] = val << 8;
  			if (j == 3)		/* crit is msb only */
  				continue;
  			regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[j][i]
  						       : TMP401_TEMP_LSB[j][i];
  			val = i2c_smbus_read_byte_data(client, regaddr);
  			if (val < 0)
  				return val;
  			data->temp[j][i] |= val;
  		}
  	}
  	return 0;
  }
  
  static struct tmp401_data *tmp401_update_device(struct device *dev)
  {
  	struct tmp401_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;
  	struct tmp401_data *ret = data;
  	int i, val;
  	unsigned long next_update;
  
  	mutex_lock(&data->update_lock);
  
  	next_update = data->last_updated +
  		      msecs_to_jiffies(data->update_interval);
  	if (time_after(jiffies, next_update) || !data->valid) {
  		if (data->kind != tmp432) {
  			/*
  			 * The driver uses the TMP432 status format internally.
  			 * Convert status to TMP432 format for other chips.
  			 */
  			val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
  			if (val < 0) {
  				ret = ERR_PTR(val);
  				goto abort;
  			}
  			data->status[0] =
  			  (val & TMP401_STATUS_REMOTE_OPEN) >> 1;
  			data->status[1] =
  			  ((val & TMP401_STATUS_REMOTE_LOW) >> 2) |
  			  ((val & TMP401_STATUS_LOCAL_LOW) >> 5);
  			data->status[2] =
  			  ((val & TMP401_STATUS_REMOTE_HIGH) >> 3) |
  			  ((val & TMP401_STATUS_LOCAL_HIGH) >> 6);
  			data->status[3] = val & (TMP401_STATUS_LOCAL_CRIT
  						| TMP401_STATUS_REMOTE_CRIT);
  		} else {
  			for (i = 0; i < ARRAY_SIZE(data->status); i++) {
  				val = i2c_smbus_read_byte_data(client,
  							TMP432_STATUS_REG[i]);
  				if (val < 0) {
  					ret = ERR_PTR(val);
  					goto abort;
  				}
  				data->status[i] = val;
  			}
  		}
  
  		val = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
  		if (val < 0) {
  			ret = ERR_PTR(val);
  			goto abort;
  		}
  		data->config = val;
  		val = tmp401_update_device_reg16(client, data);
  		if (val < 0) {
  			ret = ERR_PTR(val);
  			goto abort;
  		}
  		val = i2c_smbus_read_byte_data(client, TMP401_TEMP_CRIT_HYST);
  		if (val < 0) {
  			ret = ERR_PTR(val);
  			goto abort;
  		}
  		data->temp_crit_hyst = val;
  
  		data->last_updated = jiffies;
  		data->valid = 1;
  	}
  
  abort:
  	mutex_unlock(&data->update_lock);
  	return ret;
  }
  
  static ssize_t show_temp(struct device *dev,
  			 struct device_attribute *devattr, char *buf)
  {
  	int nr = to_sensor_dev_attr_2(devattr)->nr;
  	int index = to_sensor_dev_attr_2(devattr)->index;
  	struct tmp401_data *data = tmp401_update_device(dev);
  
  	if (IS_ERR(data))
  		return PTR_ERR(data);
  
  	return sprintf(buf, "%d
  ",
  		tmp401_register_to_temp(data->temp[nr][index], data->config));
  }
  
  static ssize_t show_temp_crit_hyst(struct device *dev,
  	struct device_attribute *devattr, char *buf)
  {
  	int temp, index = to_sensor_dev_attr(devattr)->index;
  	struct tmp401_data *data = tmp401_update_device(dev);
  
  	if (IS_ERR(data))
  		return PTR_ERR(data);
  
  	mutex_lock(&data->update_lock);
  	temp = tmp401_register_to_temp(data->temp[3][index], data->config);
  	temp -= data->temp_crit_hyst * 1000;
  	mutex_unlock(&data->update_lock);
  
  	return sprintf(buf, "%d
  ", temp);
  }
  
  static ssize_t show_status(struct device *dev,
  	struct device_attribute *devattr, char *buf)
  {
  	int nr = to_sensor_dev_attr_2(devattr)->nr;
  	int mask = to_sensor_dev_attr_2(devattr)->index;
  	struct tmp401_data *data = tmp401_update_device(dev);
  
  	if (IS_ERR(data))
  		return PTR_ERR(data);
  
  	return sprintf(buf, "%d
  ", !!(data->status[nr] & mask));
  }
  
  static ssize_t store_temp(struct device *dev, struct device_attribute *devattr,
  			  const char *buf, size_t count)
  {
  	int nr = to_sensor_dev_attr_2(devattr)->nr;
  	int index = to_sensor_dev_attr_2(devattr)->index;
  	struct tmp401_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;
  	long val;
  	u16 reg;
  	u8 regaddr;
  
  	if (kstrtol(buf, 10, &val))
  		return -EINVAL;
  
  	reg = tmp401_temp_to_register(val, data->config, nr == 3 ? 8 : 4);
  
  	mutex_lock(&data->update_lock);
  
  	regaddr = data->kind == tmp432 ? TMP432_TEMP_MSB_WRITE[nr][index]
  				       : TMP401_TEMP_MSB_WRITE[nr][index];
  	i2c_smbus_write_byte_data(client, regaddr, reg >> 8);
  	if (nr != 3) {
  		regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[nr][index]
  					       : TMP401_TEMP_LSB[nr][index];
  		i2c_smbus_write_byte_data(client, regaddr, reg & 0xFF);
  	}
  	data->temp[nr][index] = reg;
  
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }
  
  static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
  	*devattr, const char *buf, size_t count)
  {
  	int temp, index = to_sensor_dev_attr(devattr)->index;
  	struct tmp401_data *data = tmp401_update_device(dev);
  	long val;
  	u8 reg;
  
  	if (IS_ERR(data))
  		return PTR_ERR(data);
  
  	if (kstrtol(buf, 10, &val))
  		return -EINVAL;
  
  	if (data->config & TMP401_CONFIG_RANGE)
  		val = clamp_val(val, -64000, 191000);
  	else
  		val = clamp_val(val, 0, 127000);
  
  	mutex_lock(&data->update_lock);
  	temp = tmp401_register_to_temp(data->temp[3][index], data->config);
  	val = clamp_val(val, temp - 255000, temp);
  	reg = ((temp - val) + 500) / 1000;
  
  	i2c_smbus_write_byte_data(data->client, TMP401_TEMP_CRIT_HYST,
  				  reg);
  
  	data->temp_crit_hyst = reg;
  
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }
  
  /*
   * Resets the historical measurements of minimum and maximum temperatures.
   * This is done by writing any value to any of the minimum/maximum registers
   * (0x30-0x37).
   */
  static ssize_t reset_temp_history(struct device *dev,
  	struct device_attribute	*devattr, const char *buf, size_t count)
  {
  	struct tmp401_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;
  	long val;
  
  	if (kstrtol(buf, 10, &val))
  		return -EINVAL;
  
  	if (val != 1) {
  		dev_err(dev,
  			"temp_reset_history value %ld not supported. Use 1 to reset the history!
  ",
  			val);
  		return -EINVAL;
  	}
  	mutex_lock(&data->update_lock);
  	i2c_smbus_write_byte_data(client, TMP401_TEMP_MSB_WRITE[5][0], val);
  	data->valid = 0;
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }
  
  static ssize_t show_update_interval(struct device *dev,
  				    struct device_attribute *attr, char *buf)
  {
  	struct tmp401_data *data = dev_get_drvdata(dev);
  
  	return sprintf(buf, "%u
  ", data->update_interval);
  }
  
  static ssize_t set_update_interval(struct device *dev,
  				   struct device_attribute *attr,
  				   const char *buf, size_t count)
  {
  	struct tmp401_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;
  	unsigned long val;
  	int err, rate;
  
  	err = kstrtoul(buf, 10, &val);
  	if (err)
  		return err;
  
  	/*
  	 * For valid rates, interval can be calculated as
  	 *	interval = (1 << (7 - rate)) * 125;
  	 * Rounded rate is therefore
  	 *	rate = 7 - __fls(interval * 4 / (125 * 3));
  	 * Use clamp_val() to avoid overflows, and to ensure valid input
  	 * for __fls.
  	 */
  	val = clamp_val(val, 125, 16000);
  	rate = 7 - __fls(val * 4 / (125 * 3));
  	mutex_lock(&data->update_lock);
  	i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, rate);
  	data->update_interval = (1 << (7 - rate)) * 125;
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }
  
  static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
  static SENSOR_DEVICE_ATTR_2(temp1_min, S_IWUSR | S_IRUGO, show_temp,
  			    store_temp, 1, 0);
  static SENSOR_DEVICE_ATTR_2(temp1_max, S_IWUSR | S_IRUGO, show_temp,
  			    store_temp, 2, 0);
  static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IWUSR | S_IRUGO, show_temp,
  			    store_temp, 3, 0);
  static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO,
  			  show_temp_crit_hyst, store_temp_crit_hyst, 0);
  static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_status, NULL,
  			    1, TMP432_STATUS_LOCAL);
  static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_status, NULL,
  			    2, TMP432_STATUS_LOCAL);
  static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_status, NULL,
  			    3, TMP432_STATUS_LOCAL);
  static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
  static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp,
  			    store_temp, 1, 1);
  static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp,
  			    store_temp, 2, 1);
  static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IWUSR | S_IRUGO, show_temp,
  			    store_temp, 3, 1);
  static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_crit_hyst,
  			  NULL, 1);
  static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_status, NULL,
  			    0, TMP432_STATUS_REMOTE1);
  static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_status, NULL,
  			    1, TMP432_STATUS_REMOTE1);
  static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_status, NULL,
  			    2, TMP432_STATUS_REMOTE1);
  static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_status, NULL,
  			    3, TMP432_STATUS_REMOTE1);
  
  static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
  		   set_update_interval);
  
  static struct attribute *tmp401_attributes[] = {
  	&sensor_dev_attr_temp1_input.dev_attr.attr,
  	&sensor_dev_attr_temp1_min.dev_attr.attr,
  	&sensor_dev_attr_temp1_max.dev_attr.attr,
  	&sensor_dev_attr_temp1_crit.dev_attr.attr,
  	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
  	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
  
  	&sensor_dev_attr_temp2_input.dev_attr.attr,
  	&sensor_dev_attr_temp2_min.dev_attr.attr,
  	&sensor_dev_attr_temp2_max.dev_attr.attr,
  	&sensor_dev_attr_temp2_crit.dev_attr.attr,
  	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
  	&sensor_dev_attr_temp2_fault.dev_attr.attr,
  	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
  
  	&dev_attr_update_interval.attr,
  
  	NULL
  };
  
  static const struct attribute_group tmp401_group = {
  	.attrs = tmp401_attributes,
  };
  
  /*
   * Additional features of the TMP411 chip.
   * The TMP411 stores the minimum and maximum
   * temperature measured since power-on, chip-reset, or
   * minimum and maximum register reset for both the local
   * and remote channels.
   */
  static SENSOR_DEVICE_ATTR_2(temp1_lowest, S_IRUGO, show_temp, NULL, 4, 0);
  static SENSOR_DEVICE_ATTR_2(temp1_highest, S_IRUGO, show_temp, NULL, 5, 0);
  static SENSOR_DEVICE_ATTR_2(temp2_lowest, S_IRUGO, show_temp, NULL, 4, 1);
  static SENSOR_DEVICE_ATTR_2(temp2_highest, S_IRUGO, show_temp, NULL, 5, 1);
  static SENSOR_DEVICE_ATTR(temp_reset_history, S_IWUSR, NULL, reset_temp_history,
  			  0);
  
  static struct attribute *tmp411_attributes[] = {
  	&sensor_dev_attr_temp1_highest.dev_attr.attr,
  	&sensor_dev_attr_temp1_lowest.dev_attr.attr,
  	&sensor_dev_attr_temp2_highest.dev_attr.attr,
  	&sensor_dev_attr_temp2_lowest.dev_attr.attr,
  	&sensor_dev_attr_temp_reset_history.dev_attr.attr,
  	NULL
  };
  
  static const struct attribute_group tmp411_group = {
  	.attrs = tmp411_attributes,
  };
  
  static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0, 2);
  static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp,
  			    store_temp, 1, 2);
  static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp,
  			    store_temp, 2, 2);
  static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
  			    store_temp, 3, 2);
  static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temp_crit_hyst,
  			  NULL, 2);
  static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_status, NULL,
  			    0, TMP432_STATUS_REMOTE2);
  static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_status, NULL,
  			    1, TMP432_STATUS_REMOTE2);
  static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_status, NULL,
  			    2, TMP432_STATUS_REMOTE2);
  static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_status, NULL,
  			    3, TMP432_STATUS_REMOTE2);
  
  static struct attribute *tmp432_attributes[] = {
  	&sensor_dev_attr_temp3_input.dev_attr.attr,
  	&sensor_dev_attr_temp3_min.dev_attr.attr,
  	&sensor_dev_attr_temp3_max.dev_attr.attr,
  	&sensor_dev_attr_temp3_crit.dev_attr.attr,
  	&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
  	&sensor_dev_attr_temp3_fault.dev_attr.attr,
  	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
  
  	NULL
  };
  
  static const struct attribute_group tmp432_group = {
  	.attrs = tmp432_attributes,
  };
  
  /*
   * Begin non sysfs callback code (aka Real code)
   */
  
  static void tmp401_init_client(struct tmp401_data *data,
  			       struct i2c_client *client)
  {
  	int config, config_orig;
  
  	/* Set the conversion rate to 2 Hz */
  	i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
  	data->update_interval = 500;
  
  	/* Start conversions (disable shutdown if necessary) */
  	config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
  	if (config < 0) {
  		dev_warn(&client->dev, "Initialization failed!
  ");
  		return;
  	}
  
  	config_orig = config;
  	config &= ~TMP401_CONFIG_SHUTDOWN;
  
  	if (config != config_orig)
  		i2c_smbus_write_byte_data(client, TMP401_CONFIG_WRITE, config);
  }
  
  static int tmp401_detect(struct i2c_client *client,
  			 struct i2c_board_info *info)
  {
  	enum chips kind;
  	struct i2c_adapter *adapter = client->adapter;
  	u8 reg;
  
  	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
  		return -ENODEV;
  
  	/* Detect and identify the chip */
  	reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
  	if (reg != TMP401_MANUFACTURER_ID)
  		return -ENODEV;
  
  	reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
  
  	switch (reg) {
  	case TMP401_DEVICE_ID:
  		if (client->addr != 0x4c)
  			return -ENODEV;
  		kind = tmp401;
  		break;
  	case TMP411A_DEVICE_ID:
  		if (client->addr != 0x4c)
  			return -ENODEV;
  		kind = tmp411;
  		break;
  	case TMP411B_DEVICE_ID:
  		if (client->addr != 0x4d)
  			return -ENODEV;
  		kind = tmp411;
  		break;
  	case TMP411C_DEVICE_ID:
  		if (client->addr != 0x4e)
  			return -ENODEV;
  		kind = tmp411;
  		break;
  	case TMP431_DEVICE_ID:
  		if (client->addr == 0x4e)
  			return -ENODEV;
  		kind = tmp431;
  		break;
  	case TMP432_DEVICE_ID:
  		if (client->addr == 0x4e)
  			return -ENODEV;
  		kind = tmp432;
  		break;
  	default:
  		return -ENODEV;
  	}
  
  	reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
  	if (reg & 0x1b)
  		return -ENODEV;
  
  	reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
  	/* Datasheet says: 0x1-0x6 */
  	if (reg > 15)
  		return -ENODEV;
  
  	strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
  
  	return 0;
  }
  
  static int tmp401_probe(struct i2c_client *client,
  			const struct i2c_device_id *id)
  {
  	const char *names[] = { "TMP401", "TMP411", "TMP431", "TMP432" };
  	struct device *dev = &client->dev;
  	struct device *hwmon_dev;
  	struct tmp401_data *data;
  	int groups = 0;
  
  	data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
  	if (!data)
  		return -ENOMEM;
  
  	data->client = client;
  	mutex_init(&data->update_lock);
  	data->kind = id->driver_data;
  
  	/* Initialize the TMP401 chip */
  	tmp401_init_client(data, client);
  
  	/* Register sysfs hooks */
  	data->groups[groups++] = &tmp401_group;
  
  	/* Register additional tmp411 sysfs hooks */
  	if (data->kind == tmp411)
  		data->groups[groups++] = &tmp411_group;
  
  	/* Register additional tmp432 sysfs hooks */
  	if (data->kind == tmp432)
  		data->groups[groups++] = &tmp432_group;
  
  	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
  							   data, data->groups);
  	if (IS_ERR(hwmon_dev))
  		return PTR_ERR(hwmon_dev);
  
  	dev_info(dev, "Detected TI %s chip
  ", names[data->kind]);
  
  	return 0;
  }
  
  static struct i2c_driver tmp401_driver = {
  	.class		= I2C_CLASS_HWMON,
  	.driver = {
  		.name	= "tmp401",
  	},
  	.probe		= tmp401_probe,
  	.id_table	= tmp401_id,
  	.detect		= tmp401_detect,
  	.address_list	= normal_i2c,
  };
  
  module_i2c_driver(tmp401_driver);
  
  MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
  MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
  MODULE_LICENSE("GPL");