/*
   * lm63.c - driver for the National Semiconductor LM63 temperature sensor
   *          with integrated fan control

   * Copyright (C) 2004-2008  Jean Delvare <khali@linux-fr.org>

   * Based on the lm90 driver.
   *
   * The LM63 is a sensor chip made by National Semiconductor. It measures
   * two temperatures (its own and one external one) and the speed of one
   * fan, those speed it can additionally control. Complete datasheet can be
   * obtained from National's website at:
   *   http://www.national.com/pf/LM/LM63.html
   *
   * The LM63 is basically an LM86 with fan speed monitoring and control
   * capabilities added. It misses some of the LM86 features though:
   *  - No low limit for local temperature.
   *  - No critical limit for local temperature.
   *  - Critical limit for remote temperature can be changed only once. We
   *    will consider that the critical limit is read-only.
   *
   * The datasheet isn't very clear about what the tachometer reading is.
   * I had a explanation from National Semiconductor though. The two lower
   * bits of the read value have to be masked out. The value is still 16 bit
   * in width.
   *
   * 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.
   */

  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/slab.h>
  #include <linux/jiffies.h>
  #include <linux/i2c.h>

  #include <linux/hwmon-sysfs.h>

  #include <linux/hwmon.h>
  #include <linux/err.h>

  #include <linux/mutex.h>

  #include <linux/sysfs.h>

  #include <linux/types.h>

  
  /*
   * Addresses to scan
   * Address is fully defined internally and cannot be changed.
   */

  static const unsigned short normal_i2c[] = { 0x18, 0x4c, 0x4e, I2C_CLIENT_END };

  
  /*

   * The LM63 registers
   */
  
  #define LM63_REG_CONFIG1		0x03

  #define LM63_REG_CONVRATE		0x04

  #define LM63_REG_CONFIG2		0xBF
  #define LM63_REG_CONFIG_FAN		0x4A
  
  #define LM63_REG_TACH_COUNT_MSB		0x47
  #define LM63_REG_TACH_COUNT_LSB		0x46
  #define LM63_REG_TACH_LIMIT_MSB		0x49
  #define LM63_REG_TACH_LIMIT_LSB		0x48
  
  #define LM63_REG_PWM_VALUE		0x4C
  #define LM63_REG_PWM_FREQ		0x4D
  
  #define LM63_REG_LOCAL_TEMP		0x00
  #define LM63_REG_LOCAL_HIGH		0x05
  
  #define LM63_REG_REMOTE_TEMP_MSB	0x01
  #define LM63_REG_REMOTE_TEMP_LSB	0x10
  #define LM63_REG_REMOTE_OFFSET_MSB	0x11
  #define LM63_REG_REMOTE_OFFSET_LSB	0x12
  #define LM63_REG_REMOTE_HIGH_MSB	0x07
  #define LM63_REG_REMOTE_HIGH_LSB	0x13
  #define LM63_REG_REMOTE_LOW_MSB		0x08
  #define LM63_REG_REMOTE_LOW_LSB		0x14
  #define LM63_REG_REMOTE_TCRIT		0x19
  #define LM63_REG_REMOTE_TCRIT_HYST	0x21
  
  #define LM63_REG_ALERT_STATUS		0x02
  #define LM63_REG_ALERT_MASK		0x16
  
  #define LM63_REG_MAN_ID			0xFE
  #define LM63_REG_CHIP_ID		0xFF

  #define LM96163_REG_REMOTE_TEMP_U_MSB	0x31
  #define LM96163_REG_REMOTE_TEMP_U_LSB	0x32

  #define LM96163_REG_CONFIG_ENHANCED	0x45

  #define LM63_MAX_CONVRATE		9
  
  #define LM63_MAX_CONVRATE_HZ		32
  #define LM96163_MAX_CONVRATE_HZ		26

  /*
   * Conversions and various macros
   * For tachometer counts, the LM63 uses 16-bit values.
   * For local temperature and high limit, remote critical limit and hysteresis

   * value, it uses signed 8-bit values with LSB = 1 degree Celsius.

   * For remote temperature, low and high limits, it uses signed 11-bit values

   * with LSB = 0.125 degree Celsius, left-justified in 16-bit registers.

   * For LM64 the actual remote diode temperature is 16 degree Celsius higher
   * than the register reading. Remote temperature setpoints have to be
   * adapted accordingly.

   */
  
  #define FAN_FROM_REG(reg)	((reg) == 0xFFFC || (reg) == 0 ? 0 : \
  				 5400000 / (reg))
  #define FAN_TO_REG(val)		((val) <= 82 ? 0xFFFC : \
  				 (5400000 / (val)) & 0xFFFC)
  #define TEMP8_FROM_REG(reg)	((reg) * 1000)
  #define TEMP8_TO_REG(val)	((val) <= -128000 ? -128 : \
  				 (val) >= 127000 ? 127 : \
  				 (val) < 0 ? ((val) - 500) / 1000 : \
  				 ((val) + 500) / 1000)

  #define TEMP8U_TO_REG(val)	((val) <= 0 ? 0 : \
  				 (val) >= 255000 ? 255 : \
  				 ((val) + 500) / 1000)

  #define TEMP11_FROM_REG(reg)	((reg) / 32 * 125)
  #define TEMP11_TO_REG(val)	((val) <= -128000 ? 0x8000 : \
  				 (val) >= 127875 ? 0x7FE0 : \
  				 (val) < 0 ? ((val) - 62) / 125 * 32 : \
  				 ((val) + 62) / 125 * 32)

  #define TEMP11U_TO_REG(val)	((val) <= 0 ? 0 : \
  				 (val) >= 255875 ? 0xFFE0 : \
  				 ((val) + 62) / 125 * 32)

  #define HYST_TO_REG(val)	((val) <= 0 ? 0 : \
  				 (val) >= 127000 ? 127 : \
  				 ((val) + 500) / 1000)

  #define UPDATE_INTERVAL(max, rate) \
  			((1000 << (LM63_MAX_CONVRATE - (rate))) / (max))

  /*
   * Functions declaration
   */

  static int lm63_probe(struct i2c_client *client,
  		      const struct i2c_device_id *id);
  static int lm63_remove(struct i2c_client *client);

  
  static struct lm63_data *lm63_update_device(struct device *dev);

  static int lm63_detect(struct i2c_client *client, struct i2c_board_info *info);

  static void lm63_init_client(struct i2c_client *client);

  enum chips { lm63, lm64, lm96163 };

  /*
   * Driver data (common to all clients)
   */

  static const struct i2c_device_id lm63_id[] = {

  	{ "lm63", lm63 },
  	{ "lm64", lm64 },

  	{ "lm96163", lm96163 },

  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, lm63_id);

  static struct i2c_driver lm63_driver = {

  	.class		= I2C_CLASS_HWMON,

  	.driver = {

  		.name	= "lm63",
  	},

  	.probe		= lm63_probe,
  	.remove		= lm63_remove,
  	.id_table	= lm63_id,
  	.detect		= lm63_detect,

  	.address_list	= normal_i2c,

  };
  
  /*
   * Client data (each client gets its own)
   */
  
  struct lm63_data {

  	struct device *hwmon_dev;

  	struct mutex update_lock;

  	char valid; /* zero until following fields are valid */
  	unsigned long last_updated; /* in jiffies */

  	enum chips kind;

  	int temp2_offset;

  	int update_interval;	/* in milliseconds */
  	int max_convrate_hz;

  	/* registers values */
  	u8 config, config_fan;

  	u16 fan[2];	/* 0: input
  			   1: low limit */

  	u8 pwm1_freq;
  	u8 pwm1_value;

  	s8 temp8[3];	/* 0: local input
  			   1: local high limit
  			   2: remote critical limit */

  	s16 temp11[4];	/* 0: remote input

  			   1: remote low limit

  			   2: remote high limit
  			   3: remote offset */

  	u16 temp11u;	/* remote input (unsigned) */

  	u8 temp2_crit_hyst;
  	u8 alarms;

  	bool pwm_highres;

  	bool remote_unsigned; /* true if unsigned remote upper limits */

  };

  static inline int temp8_from_reg(struct lm63_data *data, int nr)
  {
  	if (data->remote_unsigned)
  		return TEMP8_FROM_REG((u8)data->temp8[nr]);
  	return TEMP8_FROM_REG(data->temp8[nr]);
  }

  /*
   * Sysfs callback functions and files
   */

  static ssize_t show_fan(struct device *dev, struct device_attribute *devattr,
  			char *buf)
  {
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  	struct lm63_data *data = lm63_update_device(dev);
  	return sprintf(buf, "%d
  ", FAN_FROM_REG(data->fan[attr->index]));

  }

  static ssize_t set_fan(struct device *dev, struct device_attribute *dummy,
  		       const char *buf, size_t count)

  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct lm63_data *data = i2c_get_clientdata(client);

  	unsigned long val;
  	int err;
  
  	err = kstrtoul(buf, 10, &val);
  	if (err)
  		return err;

  	mutex_lock(&data->update_lock);

  	data->fan[1] = FAN_TO_REG(val);

  	i2c_smbus_write_byte_data(client, LM63_REG_TACH_LIMIT_LSB,

  				  data->fan[1] & 0xFF);

  	i2c_smbus_write_byte_data(client, LM63_REG_TACH_LIMIT_MSB,

  				  data->fan[1] >> 8);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static ssize_t show_pwm1(struct device *dev, struct device_attribute *dummy,
  			 char *buf)

  {
  	struct lm63_data *data = lm63_update_device(dev);

  	int pwm;
  
  	if (data->pwm_highres)
  		pwm = data->pwm1_value;
  	else
  		pwm = data->pwm1_value >= 2 * data->pwm1_freq ?

  		       255 : (data->pwm1_value * 255 + data->pwm1_freq) /

  		       (2 * data->pwm1_freq);
  
  	return sprintf(buf, "%d
  ", pwm);

  }

  static ssize_t set_pwm1(struct device *dev, struct device_attribute *dummy,
  			const char *buf, size_t count)

  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct lm63_data *data = i2c_get_clientdata(client);
  	unsigned long val;

  	int err;

  	if (!(data->config_fan & 0x20)) /* register is read-only */
  		return -EPERM;

  	err = kstrtoul(buf, 10, &val);
  	if (err)
  		return err;

  	val = SENSORS_LIMIT(val, 0, 255);

  	mutex_lock(&data->update_lock);

  	data->pwm1_value = data->pwm_highres ? val :

  			   (val * data->pwm1_freq * 2 + 127) / 255;
  	i2c_smbus_write_byte_data(client, LM63_REG_PWM_VALUE, data->pwm1_value);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static ssize_t show_pwm1_enable(struct device *dev,
  				struct device_attribute *dummy, char *buf)

  {
  	struct lm63_data *data = lm63_update_device(dev);
  	return sprintf(buf, "%d
  ", data->config_fan & 0x20 ? 1 : 2);
  }

  /*
   * There are 8bit registers for both local(temp1) and remote(temp2) sensor.
   * For remote sensor registers temp2_offset has to be considered,
   * for local sensor it must not.
   * So we need separate 8bit accessors for local and remote sensor.
   */
  static ssize_t show_local_temp8(struct device *dev,
  				struct device_attribute *devattr,
  				char *buf)

  {
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  	struct lm63_data *data = lm63_update_device(dev);
  	return sprintf(buf, "%d
  ", TEMP8_FROM_REG(data->temp8[attr->index]));

  }

  static ssize_t show_remote_temp8(struct device *dev,
  				 struct device_attribute *devattr,
  				 char *buf)
  {
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  	struct lm63_data *data = lm63_update_device(dev);

  	return sprintf(buf, "%d
  ", temp8_from_reg(data, attr->index)

  		       + data->temp2_offset);
  }

  static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
  			 const char *buf, size_t count)

  {

  	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

  	struct i2c_client *client = to_i2c_client(dev);
  	struct lm63_data *data = i2c_get_clientdata(client);

  	int nr = attr->index;
  	int reg = nr == 2 ? LM63_REG_REMOTE_TCRIT : LM63_REG_LOCAL_HIGH;

  	long val;
  	int err;

  	int temp;

  
  	err = kstrtol(buf, 10, &val);
  	if (err)
  		return err;

  	mutex_lock(&data->update_lock);

  	if (nr == 2) {
  		if (data->remote_unsigned)
  			temp = TEMP8U_TO_REG(val - data->temp2_offset);
  		else
  			temp = TEMP8_TO_REG(val - data->temp2_offset);
  	} else {
  		temp = TEMP8_TO_REG(val);
  	}
  	data->temp8[nr] = temp;
  	i2c_smbus_write_byte_data(client, reg, temp);

  	mutex_unlock(&data->update_lock);

  	return count;

  }

  
  static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
  			   char *buf)
  {
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  	struct lm63_data *data = lm63_update_device(dev);

  	int nr = attr->index;
  	int temp;
  
  	if (!nr) {
  		/*
  		 * Use unsigned temperature unless its value is zero.
  		 * If it is zero, use signed temperature.
  		 */
  		if (data->temp11u)
  			temp = TEMP11_FROM_REG(data->temp11u);
  		else
  			temp = TEMP11_FROM_REG(data->temp11[nr]);
  	} else {
  		if (data->remote_unsigned && nr == 2)
  			temp = TEMP11_FROM_REG((u16)data->temp11[nr]);
  		else
  			temp = TEMP11_FROM_REG(data->temp11[nr]);
  	}
  	return sprintf(buf, "%d
  ", temp + data->temp2_offset);

  }

  
  static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
  			  const char *buf, size_t count)
  {

  	static const u8 reg[6] = {

  		LM63_REG_REMOTE_LOW_MSB,
  		LM63_REG_REMOTE_LOW_LSB,
  		LM63_REG_REMOTE_HIGH_MSB,
  		LM63_REG_REMOTE_HIGH_LSB,

  		LM63_REG_REMOTE_OFFSET_MSB,
  		LM63_REG_REMOTE_OFFSET_LSB,

  	};
  
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  	struct i2c_client *client = to_i2c_client(dev);
  	struct lm63_data *data = i2c_get_clientdata(client);

  	long val;
  	int err;

  	int nr = attr->index;

  	err = kstrtol(buf, 10, &val);
  	if (err)
  		return err;

  	mutex_lock(&data->update_lock);

  	if (data->remote_unsigned && nr == 2)
  		data->temp11[nr] = TEMP11U_TO_REG(val - data->temp2_offset);
  	else
  		data->temp11[nr] = TEMP11_TO_REG(val - data->temp2_offset);

  	i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2],
  				  data->temp11[nr] >> 8);
  	i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1],
  				  data->temp11[nr] & 0xff);

  	mutex_unlock(&data->update_lock);

  	return count;

  }

  /*
   * Hysteresis register holds a relative value, while we want to present
   * an absolute to user-space
   */
  static ssize_t show_temp2_crit_hyst(struct device *dev,
  				    struct device_attribute *dummy, char *buf)

  {
  	struct lm63_data *data = lm63_update_device(dev);

  	return sprintf(buf, "%d
  ", temp8_from_reg(data, 2)

  		       + data->temp2_offset

  		       - TEMP8_FROM_REG(data->temp2_crit_hyst));
  }

  /*
   * And now the other way around, user-space provides an absolute
   * hysteresis value and we have to store a relative one
   */
  static ssize_t set_temp2_crit_hyst(struct device *dev,
  				   struct device_attribute *dummy,

  				   const char *buf, size_t count)

  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct lm63_data *data = i2c_get_clientdata(client);

  	long val;
  	int err;

  	long hyst;

  	err = kstrtol(buf, 10, &val);
  	if (err)
  		return err;

  	mutex_lock(&data->update_lock);

  	hyst = temp8_from_reg(data, 2) + data->temp2_offset - val;

  	i2c_smbus_write_byte_data(client, LM63_REG_REMOTE_TCRIT_HYST,
  				  HYST_TO_REG(hyst));

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  /*
   * Set conversion rate.
   * client->update_lock must be held when calling this function.
   */
  static void lm63_set_convrate(struct i2c_client *client, struct lm63_data *data,
  			      unsigned int interval)
  {
  	int i;
  	unsigned int update_interval;
  
  	/* Shift calculations to avoid rounding errors */
  	interval <<= 6;
  
  	/* find the nearest update rate */
  	update_interval = (1 << (LM63_MAX_CONVRATE + 6)) * 1000
  	  / data->max_convrate_hz;
  	for (i = 0; i < LM63_MAX_CONVRATE; i++, update_interval >>= 1)
  		if (interval >= update_interval * 3 / 4)
  			break;
  
  	i2c_smbus_write_byte_data(client, LM63_REG_CONVRATE, i);
  	data->update_interval = UPDATE_INTERVAL(data->max_convrate_hz, i);
  }
  
  static ssize_t show_update_interval(struct device *dev,
  				    struct device_attribute *attr, char *buf)
  {
  	struct lm63_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 i2c_client *client = to_i2c_client(dev);
  	struct lm63_data *data = i2c_get_clientdata(client);
  	unsigned long val;
  	int err;
  
  	err = kstrtoul(buf, 10, &val);
  	if (err)
  		return err;
  
  	mutex_lock(&data->update_lock);
  	lm63_set_convrate(client, data, SENSORS_LIMIT(val, 0, 100000));
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }

  static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
  			   char *buf)

  {
  	struct lm63_data *data = lm63_update_device(dev);
  	return sprintf(buf, "%u
  ", data->alarms);
  }

  static ssize_t show_alarm(struct device *dev, struct device_attribute *devattr,
  			  char *buf)
  {
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
  	struct lm63_data *data = lm63_update_device(dev);
  	int bitnr = attr->index;
  
  	return sprintf(buf, "%u
  ", (data->alarms >> bitnr) & 1);
  }

  static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
  static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan,
  	set_fan, 1);

  
  static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm1, set_pwm1);
  static DEVICE_ATTR(pwm1_enable, S_IRUGO, show_pwm1_enable, NULL);

  static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_local_temp8, NULL, 0);
  static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_local_temp8,

  	set_temp8, 1);

  static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0);
  static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
  	set_temp11, 1);
  static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
  	set_temp11, 2);

  static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
  	set_temp11, 3);

  static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_remote_temp8,

  	set_temp8, 2);

  static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp2_crit_hyst,
  	set_temp2_crit_hyst);

  /* Individual alarm files */
  static SENSOR_DEVICE_ATTR(fan1_min_alarm, S_IRUGO, show_alarm, NULL, 0);
  static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);

  static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);

  static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
  static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
  static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
  /* Raw alarm file for compatibility */

  static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);

  static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
  		   set_update_interval);

  static struct attribute *lm63_attributes[] = {
  	&dev_attr_pwm1.attr,
  	&dev_attr_pwm1_enable.attr,
  	&sensor_dev_attr_temp1_input.dev_attr.attr,
  	&sensor_dev_attr_temp2_input.dev_attr.attr,
  	&sensor_dev_attr_temp2_min.dev_attr.attr,
  	&sensor_dev_attr_temp1_max.dev_attr.attr,
  	&sensor_dev_attr_temp2_max.dev_attr.attr,

  	&sensor_dev_attr_temp2_offset.dev_attr.attr,

  	&sensor_dev_attr_temp2_crit.dev_attr.attr,
  	&dev_attr_temp2_crit_hyst.attr,
  
  	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,

  	&sensor_dev_attr_temp2_fault.dev_attr.attr,

  	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
  	&dev_attr_alarms.attr,

  	&dev_attr_update_interval.attr,

  	NULL
  };

  /*
   * On LM63, temp2_crit can be set only once, which should be job
   * of the bootloader.
   * On LM64, temp2_crit can always be set.
   * On LM96163, temp2_crit can be set if bit 1 of the configuration
   * register is true.
   */
  static umode_t lm63_attribute_mode(struct kobject *kobj,
  				   struct attribute *attr, int index)
  {
  	struct device *dev = container_of(kobj, struct device, kobj);
  	struct i2c_client *client = to_i2c_client(dev);
  	struct lm63_data *data = i2c_get_clientdata(client);
  
  	if (attr == &sensor_dev_attr_temp2_crit.dev_attr.attr
  	    && (data->kind == lm64 ||
  		(data->kind == lm96163 && (data->config & 0x02))))
  		return attr->mode | S_IWUSR;
  
  	return attr->mode;
  }

  static const struct attribute_group lm63_group = {

  	.is_visible = lm63_attribute_mode,

  	.attrs = lm63_attributes,
  };
  
  static struct attribute *lm63_attributes_fan1[] = {
  	&sensor_dev_attr_fan1_input.dev_attr.attr,
  	&sensor_dev_attr_fan1_min.dev_attr.attr,
  
  	&sensor_dev_attr_fan1_min_alarm.dev_attr.attr,
  	NULL
  };
  
  static const struct attribute_group lm63_group_fan1 = {
  	.attrs = lm63_attributes_fan1,
  };

  /*
   * Real code
   */

  /* Return 0 if detection is successful, -ENODEV otherwise */

  static int lm63_detect(struct i2c_client *new_client,

  		       struct i2c_board_info *info)

  {

  	struct i2c_adapter *adapter = new_client->adapter;

  	u8 man_id, chip_id, reg_config1, reg_config2;
  	u8 reg_alert_status, reg_alert_mask;

  	int address = new_client->addr;

  
  	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))

  		return -ENODEV;

  	man_id = i2c_smbus_read_byte_data(new_client, LM63_REG_MAN_ID);
  	chip_id = i2c_smbus_read_byte_data(new_client, LM63_REG_CHIP_ID);
  
  	reg_config1 = i2c_smbus_read_byte_data(new_client,
  		      LM63_REG_CONFIG1);
  	reg_config2 = i2c_smbus_read_byte_data(new_client,
  		      LM63_REG_CONFIG2);
  	reg_alert_status = i2c_smbus_read_byte_data(new_client,
  			   LM63_REG_ALERT_STATUS);
  	reg_alert_mask = i2c_smbus_read_byte_data(new_client,
  			 LM63_REG_ALERT_MASK);
  
  	if (man_id != 0x01 /* National Semiconductor */

  	 || (reg_config1 & 0x18) != 0x00
  	 || (reg_config2 & 0xF8) != 0x00
  	 || (reg_alert_status & 0x20) != 0x00
  	 || (reg_alert_mask & 0xA4) != 0xA4) {
  		dev_dbg(&adapter->dev,
  			"Unsupported chip (man_id=0x%02X, chip_id=0x%02X)
  ",
  			man_id, chip_id);
  		return -ENODEV;

  	}

  	if (chip_id == 0x41 && address == 0x4c)
  		strlcpy(info->type, "lm63", I2C_NAME_SIZE);
  	else if (chip_id == 0x51 && (address == 0x18 || address == 0x4e))
  		strlcpy(info->type, "lm64", I2C_NAME_SIZE);

  	else if (chip_id == 0x49 && address == 0x4c)
  		strlcpy(info->type, "lm96163", I2C_NAME_SIZE);

  	else
  		return -ENODEV;

  
  	return 0;
  }
  
  static int lm63_probe(struct i2c_client *new_client,
  		      const struct i2c_device_id *id)
  {
  	struct lm63_data *data;
  	int err;
  
  	data = kzalloc(sizeof(struct lm63_data), GFP_KERNEL);
  	if (!data) {
  		err = -ENOMEM;
  		goto exit;
  	}
  
  	i2c_set_clientdata(new_client, data);

  	data->valid = 0;

  	mutex_init(&data->update_lock);

  	/* Set the device type */
  	data->kind = id->driver_data;
  	if (data->kind == lm64)
  		data->temp2_offset = 16000;
  
  	/* Initialize chip */

  	lm63_init_client(new_client);
  
  	/* Register sysfs hooks */

  	err = sysfs_create_group(&new_client->dev.kobj, &lm63_group);
  	if (err)

  		goto exit_free;

  	if (data->config & 0x04) { /* tachometer enabled */

  		err = sysfs_create_group(&new_client->dev.kobj,
  					 &lm63_group_fan1);
  		if (err)

  			goto exit_remove_files;

  	}

  	data->hwmon_dev = hwmon_device_register(&new_client->dev);
  	if (IS_ERR(data->hwmon_dev)) {
  		err = PTR_ERR(data->hwmon_dev);

  		goto exit_remove_files;

  	}

  
  	return 0;

  exit_remove_files:
  	sysfs_remove_group(&new_client->dev.kobj, &lm63_group);
  	sysfs_remove_group(&new_client->dev.kobj, &lm63_group_fan1);

  exit_free:
  	kfree(data);
  exit:
  	return err;
  }

  /*
   * Ideally we shouldn't have to initialize anything, since the BIOS
   * should have taken care of everything
   */

  static void lm63_init_client(struct i2c_client *client)
  {
  	struct lm63_data *data = i2c_get_clientdata(client);

  	u8 convrate;

  
  	data->config = i2c_smbus_read_byte_data(client, LM63_REG_CONFIG1);
  	data->config_fan = i2c_smbus_read_byte_data(client,
  						    LM63_REG_CONFIG_FAN);
  
  	/* Start converting if needed */
  	if (data->config & 0x40) { /* standby */

  		dev_dbg(&client->dev, "Switching to operational mode
  ");

  		data->config &= 0xA7;
  		i2c_smbus_write_byte_data(client, LM63_REG_CONFIG1,
  					  data->config);
  	}
  
  	/* We may need pwm1_freq before ever updating the client data */
  	data->pwm1_freq = i2c_smbus_read_byte_data(client, LM63_REG_PWM_FREQ);
  	if (data->pwm1_freq == 0)
  		data->pwm1_freq = 1;

  	switch (data->kind) {
  	case lm63:
  	case lm64:
  		data->max_convrate_hz = LM63_MAX_CONVRATE_HZ;
  		break;
  	case lm96163:
  		data->max_convrate_hz = LM96163_MAX_CONVRATE_HZ;
  		break;
  	}
  	convrate = i2c_smbus_read_byte_data(client, LM63_REG_CONVRATE);
  	if (unlikely(convrate > LM63_MAX_CONVRATE))
  		convrate = LM63_MAX_CONVRATE;
  	data->update_interval = UPDATE_INTERVAL(data->max_convrate_hz,
  						convrate);

  	/*

  	 * For LM96163, check if high resolution PWM
  	 * and unsigned temperature format is enabled.

  	 */
  	if (data->kind == lm96163) {
  		u8 config_enhanced
  		  = i2c_smbus_read_byte_data(client,
  					     LM96163_REG_CONFIG_ENHANCED);
  		if ((config_enhanced & 0x10)
  		    && !(data->config_fan & 0x08) && data->pwm1_freq == 8)
  			data->pwm_highres = true;
  		if (config_enhanced & 0x08)

  			data->remote_unsigned = true;

  	}

  	/* Show some debug info about the LM63 configuration */
  	dev_dbg(&client->dev, "Alert/tach pin configured for %s
  ",
  		(data->config & 0x04) ? "tachometer input" :
  		"alert output");
  	dev_dbg(&client->dev, "PWM clock %s kHz, output frequency %u Hz
  ",
  		(data->config_fan & 0x08) ? "1.4" : "360",
  		((data->config_fan & 0x08) ? 700 : 180000) / data->pwm1_freq);
  	dev_dbg(&client->dev, "PWM output active %s, %s mode
  ",
  		(data->config_fan & 0x10) ? "low" : "high",
  		(data->config_fan & 0x20) ? "manual" : "auto");
  }

  static int lm63_remove(struct i2c_client *client)

  {

  	struct lm63_data *data = i2c_get_clientdata(client);

  	hwmon_device_unregister(data->hwmon_dev);

  	sysfs_remove_group(&client->dev.kobj, &lm63_group);
  	sysfs_remove_group(&client->dev.kobj, &lm63_group_fan1);

  	kfree(data);

  	return 0;
  }
  
  static struct lm63_data *lm63_update_device(struct device *dev)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct lm63_data *data = i2c_get_clientdata(client);

  	unsigned long next_update;

  	mutex_lock(&data->update_lock);

  	next_update = data->last_updated
  	  + msecs_to_jiffies(data->update_interval) + 1;
  
  	if (time_after(jiffies, next_update) || !data->valid) {

  		if (data->config & 0x04) { /* tachometer enabled  */
  			/* order matters for fan1_input */

  			data->fan[0] = i2c_smbus_read_byte_data(client,
  				       LM63_REG_TACH_COUNT_LSB) & 0xFC;
  			data->fan[0] |= i2c_smbus_read_byte_data(client,
  					LM63_REG_TACH_COUNT_MSB) << 8;
  			data->fan[1] = (i2c_smbus_read_byte_data(client,
  					LM63_REG_TACH_LIMIT_LSB) & 0xFC)
  				     | (i2c_smbus_read_byte_data(client,
  					LM63_REG_TACH_LIMIT_MSB) << 8);

  		}
  
  		data->pwm1_freq = i2c_smbus_read_byte_data(client,
  				  LM63_REG_PWM_FREQ);
  		if (data->pwm1_freq == 0)
  			data->pwm1_freq = 1;
  		data->pwm1_value = i2c_smbus_read_byte_data(client,
  				   LM63_REG_PWM_VALUE);

  		data->temp8[0] = i2c_smbus_read_byte_data(client,
  				 LM63_REG_LOCAL_TEMP);
  		data->temp8[1] = i2c_smbus_read_byte_data(client,
  				 LM63_REG_LOCAL_HIGH);

  
  		/* order matters for temp2_input */

  		data->temp11[0] = i2c_smbus_read_byte_data(client,
  				  LM63_REG_REMOTE_TEMP_MSB) << 8;
  		data->temp11[0] |= i2c_smbus_read_byte_data(client,
  				   LM63_REG_REMOTE_TEMP_LSB);
  		data->temp11[1] = (i2c_smbus_read_byte_data(client,

  				  LM63_REG_REMOTE_LOW_MSB) << 8)
  				| i2c_smbus_read_byte_data(client,
  				  LM63_REG_REMOTE_LOW_LSB);

  		data->temp11[2] = (i2c_smbus_read_byte_data(client,
  				  LM63_REG_REMOTE_HIGH_MSB) << 8)
  				| i2c_smbus_read_byte_data(client,
  				  LM63_REG_REMOTE_HIGH_LSB);

  		data->temp11[3] = (i2c_smbus_read_byte_data(client,
  				  LM63_REG_REMOTE_OFFSET_MSB) << 8)
  				| i2c_smbus_read_byte_data(client,
  				  LM63_REG_REMOTE_OFFSET_LSB);

  
  		if (data->kind == lm96163)
  			data->temp11u = (i2c_smbus_read_byte_data(client,
  					LM96163_REG_REMOTE_TEMP_U_MSB) << 8)
  				      | i2c_smbus_read_byte_data(client,
  					LM96163_REG_REMOTE_TEMP_U_LSB);

  		data->temp8[2] = i2c_smbus_read_byte_data(client,
  				 LM63_REG_REMOTE_TCRIT);

  		data->temp2_crit_hyst = i2c_smbus_read_byte_data(client,
  					LM63_REG_REMOTE_TCRIT_HYST);
  
  		data->alarms = i2c_smbus_read_byte_data(client,
  			       LM63_REG_ALERT_STATUS) & 0x7F;
  
  		data->last_updated = jiffies;
  		data->valid = 1;
  	}

  	mutex_unlock(&data->update_lock);

  
  	return data;
  }
  
  static int __init sensors_lm63_init(void)
  {
  	return i2c_add_driver(&lm63_driver);
  }
  
  static void __exit sensors_lm63_exit(void)
  {
  	i2c_del_driver(&lm63_driver);
  }
  
  MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
  MODULE_DESCRIPTION("LM63 driver");
  MODULE_LICENSE("GPL");
  
  module_init(sensors_lm63_init);
  module_exit(sensors_lm63_exit);