/*
      gl520sm.c - Part of lm_sensors, Linux kernel modules for hardware
                  monitoring
      Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl>,

                                Kyösti Mälkki <kmalkki@cc.hut.fi>

      Copyright (c) 2005        Maarten Deprez <maartendeprez@users.sourceforge.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.
  
  */
  
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/slab.h>

  #include <linux/jiffies.h>

  #include <linux/i2c.h>

  #include <linux/hwmon.h>

  #include <linux/hwmon-sysfs.h>

  #include <linux/hwmon-vid.h>

  #include <linux/err.h>

  #include <linux/mutex.h>

  #include <linux/sysfs.h>

  
  /* Type of the extra sensor */
  static unsigned short extra_sensor_type;
  module_param(extra_sensor_type, ushort, 0);
  MODULE_PARM_DESC(extra_sensor_type, "Type of extra sensor (0=autodetect, 1=temperature, 2=voltage)");
  
  /* Addresses to scan */

  static const unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };

  /* Many GL520 constants specified below

  One of the inputs can be configured as either temp or voltage.

  That's why _TEMP2 and _IN4 access the same register

  */
  
  /* The GL520 registers */
  #define GL520_REG_CHIP_ID		0x00
  #define GL520_REG_REVISION		0x01
  #define GL520_REG_CONF			0x03
  #define GL520_REG_MASK			0x11
  
  #define GL520_REG_VID_INPUT		0x02

  static const u8 GL520_REG_IN_INPUT[]	= { 0x15, 0x14, 0x13, 0x0d, 0x0e };
  static const u8 GL520_REG_IN_LIMIT[]	= { 0x0c, 0x09, 0x0a, 0x0b };
  static const u8 GL520_REG_IN_MIN[]	= { 0x0c, 0x09, 0x0a, 0x0b, 0x18 };
  static const u8 GL520_REG_IN_MAX[]	= { 0x0c, 0x09, 0x0a, 0x0b, 0x17 };
  
  static const u8 GL520_REG_TEMP_INPUT[]		= { 0x04, 0x0e };
  static const u8 GL520_REG_TEMP_MAX[]		= { 0x05, 0x17 };
  static const u8 GL520_REG_TEMP_MAX_HYST[]	= { 0x06, 0x18 };

  
  #define GL520_REG_FAN_INPUT		0x07
  #define GL520_REG_FAN_MIN		0x08
  #define GL520_REG_FAN_DIV		0x0f
  #define GL520_REG_FAN_OFF		GL520_REG_FAN_DIV
  
  #define GL520_REG_ALARMS		0x12
  #define GL520_REG_BEEP_MASK		0x10
  #define GL520_REG_BEEP_ENABLE		GL520_REG_CONF
  
  /*
   * Function declarations
   */

  static int gl520_probe(struct i2c_client *client,
  		       const struct i2c_device_id *id);

  static int gl520_detect(struct i2c_client *client, struct i2c_board_info *info);

  static void gl520_init_client(struct i2c_client *client);

  static int gl520_remove(struct i2c_client *client);

  static int gl520_read_value(struct i2c_client *client, u8 reg);
  static int gl520_write_value(struct i2c_client *client, u8 reg, u16 value);
  static struct gl520_data *gl520_update_device(struct device *dev);
  
  /* Driver data */

  static const struct i2c_device_id gl520_id[] = {

  	{ "gl520sm", 0 },

  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, gl520_id);

  static struct i2c_driver gl520_driver = {

  	.class		= I2C_CLASS_HWMON,

  	.driver = {

  		.name	= "gl520sm",
  	},

  	.probe		= gl520_probe,
  	.remove		= gl520_remove,
  	.id_table	= gl520_id,
  	.detect		= gl520_detect,

  	.address_list	= normal_i2c,

  };
  
  /* Client data */
  struct gl520_data {

  	struct device *hwmon_dev;

  	struct mutex update_lock;

  	char valid;		/* zero until the following fields are valid */
  	unsigned long last_updated;	/* in jiffies */
  
  	u8 vid;
  	u8 vrm;
  	u8 in_input[5];		/* [0] = VVD */
  	u8 in_min[5];		/* [0] = VDD */
  	u8 in_max[5];		/* [0] = VDD */
  	u8 fan_input[2];
  	u8 fan_min[2];
  	u8 fan_div[2];
  	u8 fan_off;
  	u8 temp_input[2];
  	u8 temp_max[2];
  	u8 temp_max_hyst[2];
  	u8 alarms;
  	u8 beep_enable;
  	u8 beep_mask;
  	u8 alarm_mask;
  	u8 two_temps;
  };
  
  /*
   * Sysfs stuff
   */

  static ssize_t get_cpu_vid(struct device *dev, struct device_attribute *attr,
  			   char *buf)

  {

  	struct gl520_data *data = gl520_update_device(dev);

  	return sprintf(buf, "%u
  ", vid_from_reg(data->vid, data->vrm));
  }

  static DEVICE_ATTR(cpu0_vid, S_IRUGO, get_cpu_vid, NULL);

  
  #define VDD_FROM_REG(val) (((val)*95+2)/4)
  #define VDD_TO_REG(val) (SENSORS_LIMIT((((val)*4+47)/95),0,255))
  
  #define IN_FROM_REG(val) ((val)*19)
  #define IN_TO_REG(val) (SENSORS_LIMIT((((val)+9)/19),0,255))

  static ssize_t get_in_input(struct device *dev, struct device_attribute *attr,
  			    char *buf)

  {

  	int n = to_sensor_dev_attr(attr)->index;
  	struct gl520_data *data = gl520_update_device(dev);

  	u8 r = data->in_input[n];
  
  	if (n == 0)
  		return sprintf(buf, "%d
  ", VDD_FROM_REG(r));
  	else
  		return sprintf(buf, "%d
  ", IN_FROM_REG(r));
  }

  static ssize_t get_in_min(struct device *dev, struct device_attribute *attr,
  			  char *buf)

  {

  	int n = to_sensor_dev_attr(attr)->index;
  	struct gl520_data *data = gl520_update_device(dev);

  	u8 r = data->in_min[n];
  
  	if (n == 0)
  		return sprintf(buf, "%d
  ", VDD_FROM_REG(r));
  	else
  		return sprintf(buf, "%d
  ", IN_FROM_REG(r));
  }

  static ssize_t get_in_max(struct device *dev, struct device_attribute *attr,
  			  char *buf)

  {

  	int n = to_sensor_dev_attr(attr)->index;
  	struct gl520_data *data = gl520_update_device(dev);

  	u8 r = data->in_max[n];
  
  	if (n == 0)
  		return sprintf(buf, "%d
  ", VDD_FROM_REG(r));
  	else
  		return sprintf(buf, "%d
  ", IN_FROM_REG(r));
  }

  static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
  			  const char *buf, size_t count)

  {

  	struct i2c_client *client = to_i2c_client(dev);
  	struct gl520_data *data = i2c_get_clientdata(client);
  	int n = to_sensor_dev_attr(attr)->index;

  	long v = simple_strtol(buf, NULL, 10);
  	u8 r;

  	mutex_lock(&data->update_lock);

  
  	if (n == 0)
  		r = VDD_TO_REG(v);
  	else
  		r = IN_TO_REG(v);
  
  	data->in_min[n] = r;
  
  	if (n < 4)

  		gl520_write_value(client, GL520_REG_IN_MIN[n],
  				  (gl520_read_value(client, GL520_REG_IN_MIN[n])
  				   & ~0xff) | r);

  	else

  		gl520_write_value(client, GL520_REG_IN_MIN[n], r);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
  			  const char *buf, size_t count)

  {

  	struct i2c_client *client = to_i2c_client(dev);
  	struct gl520_data *data = i2c_get_clientdata(client);
  	int n = to_sensor_dev_attr(attr)->index;

  	long v = simple_strtol(buf, NULL, 10);
  	u8 r;
  
  	if (n == 0)
  		r = VDD_TO_REG(v);
  	else
  		r = IN_TO_REG(v);

  	mutex_lock(&data->update_lock);

  
  	data->in_max[n] = r;
  
  	if (n < 4)

  		gl520_write_value(client, GL520_REG_IN_MAX[n],
  				  (gl520_read_value(client, GL520_REG_IN_MAX[n])
  				   & ~0xff00) | (r << 8));

  	else

  		gl520_write_value(client, GL520_REG_IN_MAX[n], r);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, get_in_input, NULL, 0);
  static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, get_in_input, NULL, 1);
  static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, get_in_input, NULL, 2);
  static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, get_in_input, NULL, 3);
  static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, get_in_input, NULL, 4);
  static SENSOR_DEVICE_ATTR(in0_min, S_IRUGO | S_IWUSR,
  		get_in_min, set_in_min, 0);
  static SENSOR_DEVICE_ATTR(in1_min, S_IRUGO | S_IWUSR,
  		get_in_min, set_in_min, 1);
  static SENSOR_DEVICE_ATTR(in2_min, S_IRUGO | S_IWUSR,
  		get_in_min, set_in_min, 2);
  static SENSOR_DEVICE_ATTR(in3_min, S_IRUGO | S_IWUSR,
  		get_in_min, set_in_min, 3);
  static SENSOR_DEVICE_ATTR(in4_min, S_IRUGO | S_IWUSR,
  		get_in_min, set_in_min, 4);
  static SENSOR_DEVICE_ATTR(in0_max, S_IRUGO | S_IWUSR,
  		get_in_max, set_in_max, 0);
  static SENSOR_DEVICE_ATTR(in1_max, S_IRUGO | S_IWUSR,
  		get_in_max, set_in_max, 1);
  static SENSOR_DEVICE_ATTR(in2_max, S_IRUGO | S_IWUSR,
  		get_in_max, set_in_max, 2);
  static SENSOR_DEVICE_ATTR(in3_max, S_IRUGO | S_IWUSR,
  		get_in_max, set_in_max, 3);
  static SENSOR_DEVICE_ATTR(in4_max, S_IRUGO | S_IWUSR,
  		get_in_max, set_in_max, 4);

  #define DIV_FROM_REG(val) (1 << (val))
  #define FAN_FROM_REG(val,div) ((val)==0 ? 0 : (480000/((val) << (div))))

  #define FAN_TO_REG(val,div) ((val)<=0?0:SENSORS_LIMIT((480000 + ((val) << ((div)-1))) / ((val) << (div)), 1, 255))

  static ssize_t get_fan_input(struct device *dev, struct device_attribute *attr,
  			     char *buf)

  {

  	int n = to_sensor_dev_attr(attr)->index;
  	struct gl520_data *data = gl520_update_device(dev);
  
  	return sprintf(buf, "%d
  ", FAN_FROM_REG(data->fan_input[n],
  						 data->fan_div[n]));

  }

  static ssize_t get_fan_min(struct device *dev, struct device_attribute *attr,
  			   char *buf)

  {

  	int n = to_sensor_dev_attr(attr)->index;
  	struct gl520_data *data = gl520_update_device(dev);
  
  	return sprintf(buf, "%d
  ", FAN_FROM_REG(data->fan_min[n],
  						 data->fan_div[n]));

  }

  static ssize_t get_fan_div(struct device *dev, struct device_attribute *attr,
  			   char *buf)

  {

  	int n = to_sensor_dev_attr(attr)->index;
  	struct gl520_data *data = gl520_update_device(dev);
  
  	return sprintf(buf, "%d
  ", DIV_FROM_REG(data->fan_div[n]));

  }

  static ssize_t get_fan_off(struct device *dev, struct device_attribute *attr,
  			   char *buf)

  {

  	struct gl520_data *data = gl520_update_device(dev);

  	return sprintf(buf, "%d
  ", data->fan_off);
  }

  static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
  			   const char *buf, size_t count)

  {

  	struct i2c_client *client = to_i2c_client(dev);
  	struct gl520_data *data = i2c_get_clientdata(client);
  	int n = to_sensor_dev_attr(attr)->index;

  	unsigned long v = simple_strtoul(buf, NULL, 10);
  	u8 r;

  	mutex_lock(&data->update_lock);

  	r = FAN_TO_REG(v, data->fan_div[n]);
  	data->fan_min[n] = r;

  	if (n == 0)
  		gl520_write_value(client, GL520_REG_FAN_MIN,
  				  (gl520_read_value(client, GL520_REG_FAN_MIN)
  				   & ~0xff00) | (r << 8));

  	else

  		gl520_write_value(client, GL520_REG_FAN_MIN,
  				  (gl520_read_value(client, GL520_REG_FAN_MIN)
  				   & ~0xff) | r);

  
  	data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);

  	if (data->fan_min[n] == 0)
  		data->alarm_mask &= (n == 0) ? ~0x20 : ~0x40;

  	else

  		data->alarm_mask |= (n == 0) ? 0x20 : 0x40;

  	data->beep_mask &= data->alarm_mask;
  	gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
  			   const char *buf, size_t count)

  {

  	struct i2c_client *client = to_i2c_client(dev);
  	struct gl520_data *data = i2c_get_clientdata(client);
  	int n = to_sensor_dev_attr(attr)->index;

  	unsigned long v = simple_strtoul(buf, NULL, 10);
  	u8 r;
  
  	switch (v) {
  	case 1: r = 0; break;
  	case 2: r = 1; break;
  	case 4: r = 2; break;
  	case 8: r = 3; break;
  	default:
  		dev_err(&client->dev, "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!
  ", v);
  		return -EINVAL;
  	}

  	mutex_lock(&data->update_lock);

  	data->fan_div[n] = r;

  	if (n == 0)
  		gl520_write_value(client, GL520_REG_FAN_DIV,
  				  (gl520_read_value(client, GL520_REG_FAN_DIV)
  				   & ~0xc0) | (r << 6));

  	else

  		gl520_write_value(client, GL520_REG_FAN_DIV,
  				  (gl520_read_value(client, GL520_REG_FAN_DIV)
  				   & ~0x30) | (r << 4));

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static ssize_t set_fan_off(struct device *dev, struct device_attribute *attr,
  			   const char *buf, size_t count)

  {

  	struct i2c_client *client = to_i2c_client(dev);
  	struct gl520_data *data = i2c_get_clientdata(client);

  	u8 r = simple_strtoul(buf, NULL, 10)?1:0;

  	mutex_lock(&data->update_lock);

  	data->fan_off = r;

  	gl520_write_value(client, GL520_REG_FAN_OFF,
  			  (gl520_read_value(client, GL520_REG_FAN_OFF)
  			   & ~0x0c) | (r << 2));

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan_input, NULL, 0);
  static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan_input, NULL, 1);
  static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
  		get_fan_min, set_fan_min, 0);
  static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO | S_IWUSR,
  		get_fan_min, set_fan_min, 1);
  static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
  		get_fan_div, set_fan_div, 0);
  static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
  		get_fan_div, set_fan_div, 1);
  static DEVICE_ATTR(fan1_off, S_IRUGO | S_IWUSR,
  		get_fan_off, set_fan_off);

  #define TEMP_FROM_REG(val) (((val) - 130) * 1000)
  #define TEMP_TO_REG(val) (SENSORS_LIMIT(((((val)<0?(val)-500:(val)+500) / 1000)+130),0,255))

  static ssize_t get_temp_input(struct device *dev, struct device_attribute *attr,
  			      char *buf)

  {

  	int n = to_sensor_dev_attr(attr)->index;
  	struct gl520_data *data = gl520_update_device(dev);
  
  	return sprintf(buf, "%d
  ", TEMP_FROM_REG(data->temp_input[n]));

  }

  static ssize_t get_temp_max(struct device *dev, struct device_attribute *attr,
  			    char *buf)

  {

  	int n = to_sensor_dev_attr(attr)->index;
  	struct gl520_data *data = gl520_update_device(dev);
  
  	return sprintf(buf, "%d
  ", TEMP_FROM_REG(data->temp_max[n]));

  }

  static ssize_t get_temp_max_hyst(struct device *dev, struct device_attribute
  				 *attr, char *buf)

  {

  	int n = to_sensor_dev_attr(attr)->index;
  	struct gl520_data *data = gl520_update_device(dev);
  
  	return sprintf(buf, "%d
  ", TEMP_FROM_REG(data->temp_max_hyst[n]));

  }

  static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
  			    const char *buf, size_t count)

  {

  	struct i2c_client *client = to_i2c_client(dev);
  	struct gl520_data *data = i2c_get_clientdata(client);
  	int n = to_sensor_dev_attr(attr)->index;

  	long v = simple_strtol(buf, NULL, 10);

  	mutex_lock(&data->update_lock);

  	data->temp_max[n] = TEMP_TO_REG(v);
  	gl520_write_value(client, GL520_REG_TEMP_MAX[n], data->temp_max[n]);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static ssize_t set_temp_max_hyst(struct device *dev, struct device_attribute
  				 *attr, const char *buf, size_t count)

  {

  	struct i2c_client *client = to_i2c_client(dev);
  	struct gl520_data *data = i2c_get_clientdata(client);
  	int n = to_sensor_dev_attr(attr)->index;

  	long v = simple_strtol(buf, NULL, 10);

  	mutex_lock(&data->update_lock);

  	data->temp_max_hyst[n] = TEMP_TO_REG(v);
  	gl520_write_value(client, GL520_REG_TEMP_MAX_HYST[n],
  			  data->temp_max_hyst[n]);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_temp_input, NULL, 0);
  static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_temp_input, NULL, 1);
  static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
  		get_temp_max, set_temp_max, 0);
  static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR,
  		get_temp_max, set_temp_max, 1);
  static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR,
  		get_temp_max_hyst, set_temp_max_hyst, 0);
  static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IRUGO | S_IWUSR,
  		get_temp_max_hyst, set_temp_max_hyst, 1);
  
  static ssize_t get_alarms(struct device *dev, struct device_attribute *attr,
  			  char *buf)

  {

  	struct gl520_data *data = gl520_update_device(dev);

  	return sprintf(buf, "%d
  ", data->alarms);
  }

  static ssize_t get_beep_enable(struct device *dev, struct device_attribute
  			       *attr, char *buf)

  {

  	struct gl520_data *data = gl520_update_device(dev);

  	return sprintf(buf, "%d
  ", data->beep_enable);
  }

  static ssize_t get_beep_mask(struct device *dev, struct device_attribute *attr,
  			     char *buf)

  {

  	struct gl520_data *data = gl520_update_device(dev);

  	return sprintf(buf, "%d
  ", data->beep_mask);
  }

  static ssize_t set_beep_enable(struct device *dev, struct device_attribute
  			       *attr, const char *buf, size_t count)

  {

  	struct i2c_client *client = to_i2c_client(dev);
  	struct gl520_data *data = i2c_get_clientdata(client);

  	u8 r = simple_strtoul(buf, NULL, 10)?0:1;

  	mutex_lock(&data->update_lock);

  	data->beep_enable = !r;

  	gl520_write_value(client, GL520_REG_BEEP_ENABLE,
  			  (gl520_read_value(client, GL520_REG_BEEP_ENABLE)
  			   & ~0x04) | (r << 2));

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static ssize_t set_beep_mask(struct device *dev, struct device_attribute *attr,
  			     const char *buf, size_t count)

  {

  	struct i2c_client *client = to_i2c_client(dev);
  	struct gl520_data *data = i2c_get_clientdata(client);

  	u8 r = simple_strtoul(buf, NULL, 10);

  	mutex_lock(&data->update_lock);

  	r &= data->alarm_mask;
  	data->beep_mask = r;

  	gl520_write_value(client, GL520_REG_BEEP_MASK, r);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static DEVICE_ATTR(alarms, S_IRUGO, get_alarms, NULL);
  static DEVICE_ATTR(beep_enable, S_IRUGO | S_IWUSR,
  		get_beep_enable, set_beep_enable);
  static DEVICE_ATTR(beep_mask, S_IRUGO | S_IWUSR,
  		get_beep_mask, set_beep_mask);

  static ssize_t get_alarm(struct device *dev, struct device_attribute *attr,
  			 char *buf)
  {
  	int bit_nr = to_sensor_dev_attr(attr)->index;
  	struct gl520_data *data = gl520_update_device(dev);
  
  	return sprintf(buf, "%d
  ", (data->alarms >> bit_nr) & 1);
  }
  
  static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, get_alarm, NULL, 0);
  static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, get_alarm, NULL, 1);
  static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, get_alarm, NULL, 2);
  static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, get_alarm, NULL, 3);
  static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, get_alarm, NULL, 4);
  static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, get_alarm, NULL, 5);
  static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, get_alarm, NULL, 6);
  static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, get_alarm, NULL, 7);
  static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, get_alarm, NULL, 7);
  
  static ssize_t get_beep(struct device *dev, struct device_attribute *attr,
  			char *buf)
  {
  	int bitnr = to_sensor_dev_attr(attr)->index;
  	struct gl520_data *data = gl520_update_device(dev);
  
  	return sprintf(buf, "%d
  ", (data->beep_mask >> bitnr) & 1);
  }
  
  static ssize_t set_beep(struct device *dev, struct device_attribute *attr,
  			const char *buf, size_t count)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct gl520_data *data = i2c_get_clientdata(client);
  	int bitnr = to_sensor_dev_attr(attr)->index;
  	unsigned long bit;
  
  	bit = simple_strtoul(buf, NULL, 10);
  	if (bit & ~1)
  		return -EINVAL;
  
  	mutex_lock(&data->update_lock);
  	data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
  	if (bit)
  		data->beep_mask |= (1 << bitnr);
  	else
  		data->beep_mask &= ~(1 << bitnr);
  	gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);
  	mutex_unlock(&data->update_lock);
  	return count;
  }
  
  static SENSOR_DEVICE_ATTR(in0_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 0);
  static SENSOR_DEVICE_ATTR(in1_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 1);
  static SENSOR_DEVICE_ATTR(in2_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 2);
  static SENSOR_DEVICE_ATTR(in3_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 3);
  static SENSOR_DEVICE_ATTR(temp1_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 4);
  static SENSOR_DEVICE_ATTR(fan1_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 5);
  static SENSOR_DEVICE_ATTR(fan2_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 6);
  static SENSOR_DEVICE_ATTR(temp2_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 7);
  static SENSOR_DEVICE_ATTR(in4_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 7);

  static struct attribute *gl520_attributes[] = {
  	&dev_attr_cpu0_vid.attr,

  	&sensor_dev_attr_in0_input.dev_attr.attr,
  	&sensor_dev_attr_in0_min.dev_attr.attr,
  	&sensor_dev_attr_in0_max.dev_attr.attr,

  	&sensor_dev_attr_in0_alarm.dev_attr.attr,
  	&sensor_dev_attr_in0_beep.dev_attr.attr,

  	&sensor_dev_attr_in1_input.dev_attr.attr,
  	&sensor_dev_attr_in1_min.dev_attr.attr,
  	&sensor_dev_attr_in1_max.dev_attr.attr,

  	&sensor_dev_attr_in1_alarm.dev_attr.attr,
  	&sensor_dev_attr_in1_beep.dev_attr.attr,

  	&sensor_dev_attr_in2_input.dev_attr.attr,
  	&sensor_dev_attr_in2_min.dev_attr.attr,
  	&sensor_dev_attr_in2_max.dev_attr.attr,

  	&sensor_dev_attr_in2_alarm.dev_attr.attr,
  	&sensor_dev_attr_in2_beep.dev_attr.attr,

  	&sensor_dev_attr_in3_input.dev_attr.attr,
  	&sensor_dev_attr_in3_min.dev_attr.attr,
  	&sensor_dev_attr_in3_max.dev_attr.attr,

  	&sensor_dev_attr_in3_alarm.dev_attr.attr,
  	&sensor_dev_attr_in3_beep.dev_attr.attr,

  
  	&sensor_dev_attr_fan1_input.dev_attr.attr,
  	&sensor_dev_attr_fan1_min.dev_attr.attr,
  	&sensor_dev_attr_fan1_div.dev_attr.attr,

  	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
  	&sensor_dev_attr_fan1_beep.dev_attr.attr,

  	&dev_attr_fan1_off.attr,

  	&sensor_dev_attr_fan2_input.dev_attr.attr,
  	&sensor_dev_attr_fan2_min.dev_attr.attr,
  	&sensor_dev_attr_fan2_div.dev_attr.attr,

  	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
  	&sensor_dev_attr_fan2_beep.dev_attr.attr,

  	&sensor_dev_attr_temp1_input.dev_attr.attr,
  	&sensor_dev_attr_temp1_max.dev_attr.attr,
  	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,

  	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp1_beep.dev_attr.attr,

  
  	&dev_attr_alarms.attr,
  	&dev_attr_beep_enable.attr,
  	&dev_attr_beep_mask.attr,
  	NULL
  };
  
  static const struct attribute_group gl520_group = {
  	.attrs = gl520_attributes,
  };
  
  static struct attribute *gl520_attributes_opt[] = {

  	&sensor_dev_attr_in4_input.dev_attr.attr,
  	&sensor_dev_attr_in4_min.dev_attr.attr,
  	&sensor_dev_attr_in4_max.dev_attr.attr,

  	&sensor_dev_attr_in4_alarm.dev_attr.attr,
  	&sensor_dev_attr_in4_beep.dev_attr.attr,

  	&sensor_dev_attr_temp2_input.dev_attr.attr,
  	&sensor_dev_attr_temp2_max.dev_attr.attr,
  	&sensor_dev_attr_temp2_max_hyst.dev_attr.attr,

  	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp2_beep.dev_attr.attr,

  	NULL
  };
  
  static const struct attribute_group gl520_group_opt = {
  	.attrs = gl520_attributes_opt,
  };

  
  /*
   * Real code
   */

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

  static int gl520_detect(struct i2c_client *client, struct i2c_board_info *info)

  {

  	struct i2c_adapter *adapter = client->adapter;

  
  	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
  				     I2C_FUNC_SMBUS_WORD_DATA))

  		return -ENODEV;

  
  	/* Determine the chip type. */

  	if ((gl520_read_value(client, GL520_REG_CHIP_ID) != 0x20) ||
  	    ((gl520_read_value(client, GL520_REG_REVISION) & 0x7f) != 0x00) ||
  	    ((gl520_read_value(client, GL520_REG_CONF) & 0x80) != 0x00)) {
  		dev_dbg(&client->dev, "Unknown chip type, skipping
  ");
  		return -ENODEV;

  	}

  	strlcpy(info->type, "gl520sm", I2C_NAME_SIZE);

  	return 0;
  }
  
  static int gl520_probe(struct i2c_client *client,
  		       const struct i2c_device_id *id)
  {
  	struct gl520_data *data;
  	int err;
  
  	data = kzalloc(sizeof(struct gl520_data), GFP_KERNEL);
  	if (!data) {
  		err = -ENOMEM;
  		goto exit;
  	}
  
  	i2c_set_clientdata(client, data);
  	mutex_init(&data->update_lock);

  
  	/* Initialize the GL520SM chip */

  	gl520_init_client(client);

  
  	/* Register sysfs hooks */

  	if ((err = sysfs_create_group(&client->dev.kobj, &gl520_group)))

  		goto exit_free;

  	if (data->two_temps) {

  		if ((err = device_create_file(&client->dev,

  				&sensor_dev_attr_temp2_input.dev_attr))

  		 || (err = device_create_file(&client->dev,

  				&sensor_dev_attr_temp2_max.dev_attr))

  		 || (err = device_create_file(&client->dev,

  				&sensor_dev_attr_temp2_max_hyst.dev_attr))
  		 || (err = device_create_file(&client->dev,
  				&sensor_dev_attr_temp2_alarm.dev_attr))
  		 || (err = device_create_file(&client->dev,
  				&sensor_dev_attr_temp2_beep.dev_attr)))

  			goto exit_remove_files;
  	} else {

  		if ((err = device_create_file(&client->dev,

  				&sensor_dev_attr_in4_input.dev_attr))

  		 || (err = device_create_file(&client->dev,

  				&sensor_dev_attr_in4_min.dev_attr))

  		 || (err = device_create_file(&client->dev,

  				&sensor_dev_attr_in4_max.dev_attr))
  		 || (err = device_create_file(&client->dev,
  				&sensor_dev_attr_in4_alarm.dev_attr))
  		 || (err = device_create_file(&client->dev,
  				&sensor_dev_attr_in4_beep.dev_attr)))

  			goto exit_remove_files;
  	}

  	data->hwmon_dev = hwmon_device_register(&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(&client->dev.kobj, &gl520_group);
  	sysfs_remove_group(&client->dev.kobj, &gl520_group_opt);

  exit_free:
  	kfree(data);
  exit:
  	return err;
  }
  
  
  /* Called when we have found a new GL520SM. */
  static void gl520_init_client(struct i2c_client *client)
  {
  	struct gl520_data *data = i2c_get_clientdata(client);
  	u8 oldconf, conf;
  
  	conf = oldconf = gl520_read_value(client, GL520_REG_CONF);
  
  	data->alarm_mask = 0xff;

  	data->vrm = vid_which_vrm();

  
  	if (extra_sensor_type == 1)
  		conf &= ~0x10;
  	else if (extra_sensor_type == 2)
  		conf |= 0x10;
  	data->two_temps = !(conf & 0x10);
  
  	/* If IRQ# is disabled, we can safely force comparator mode */
  	if (!(conf & 0x20))
  		conf &= 0xf7;
  
  	/* Enable monitoring if needed */
  	conf |= 0x40;
  
  	if (conf != oldconf)
  		gl520_write_value(client, GL520_REG_CONF, conf);
  
  	gl520_update_device(&(client->dev));
  
  	if (data->fan_min[0] == 0)
  		data->alarm_mask &= ~0x20;
  	if (data->fan_min[1] == 0)
  		data->alarm_mask &= ~0x40;
  
  	data->beep_mask &= data->alarm_mask;
  	gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);
  }

  static int gl520_remove(struct i2c_client *client)

  {

  	struct gl520_data *data = i2c_get_clientdata(client);

  	hwmon_device_unregister(data->hwmon_dev);

  	sysfs_remove_group(&client->dev.kobj, &gl520_group);
  	sysfs_remove_group(&client->dev.kobj, &gl520_group_opt);

  	kfree(data);

  	return 0;
  }

  /* Registers 0x07 to 0x0c are word-sized, others are byte-sized

     GL520 uses a high-byte first convention */
  static int gl520_read_value(struct i2c_client *client, u8 reg)
  {
  	if ((reg >= 0x07) && (reg <= 0x0c))

  		return i2c_smbus_read_word_swapped(client, reg);

  	else
  		return i2c_smbus_read_byte_data(client, reg);
  }
  
  static int gl520_write_value(struct i2c_client *client, u8 reg, u16 value)
  {
  	if ((reg >= 0x07) && (reg <= 0x0c))

  		return i2c_smbus_write_word_swapped(client, reg, value);

  	else
  		return i2c_smbus_write_byte_data(client, reg, value);
  }
  
  
  static struct gl520_data *gl520_update_device(struct device *dev)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct gl520_data *data = i2c_get_clientdata(client);

  	int val, i;

  	mutex_lock(&data->update_lock);

  	if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {

  
  		dev_dbg(&client->dev, "Starting gl520sm update
  ");
  
  		data->alarms = gl520_read_value(client, GL520_REG_ALARMS);
  		data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
  		data->vid = gl520_read_value(client, GL520_REG_VID_INPUT) & 0x1f;

  		for (i = 0; i < 4; i++) {
  			data->in_input[i] = gl520_read_value(client,
  							GL520_REG_IN_INPUT[i]);
  			val = gl520_read_value(client, GL520_REG_IN_LIMIT[i]);
  			data->in_min[i] = val & 0xff;
  			data->in_max[i] = (val >> 8) & 0xff;
  		}

  
  		val = gl520_read_value(client, GL520_REG_FAN_INPUT);
  		data->fan_input[0] = (val >> 8) & 0xff;
  		data->fan_input[1] = val & 0xff;
  
  		val = gl520_read_value(client, GL520_REG_FAN_MIN);
  		data->fan_min[0] = (val >> 8) & 0xff;
  		data->fan_min[1] = val & 0xff;

  		data->temp_input[0] = gl520_read_value(client,
  						GL520_REG_TEMP_INPUT[0]);
  		data->temp_max[0] = gl520_read_value(client,
  						GL520_REG_TEMP_MAX[0]);
  		data->temp_max_hyst[0] = gl520_read_value(client,
  						GL520_REG_TEMP_MAX_HYST[0]);

  
  		val = gl520_read_value(client, GL520_REG_FAN_DIV);
  		data->fan_div[0] = (val >> 6) & 0x03;
  		data->fan_div[1] = (val >> 4) & 0x03;
  		data->fan_off = (val >> 2) & 0x01;
  
  		data->alarms &= data->alarm_mask;
  
  		val = gl520_read_value(client, GL520_REG_CONF);
  		data->beep_enable = !((val >> 2) & 1);

  		/* Temp1 and Vin4 are the same input */
  		if (data->two_temps) {

  			data->temp_input[1] = gl520_read_value(client,
  						GL520_REG_TEMP_INPUT[1]);
  			data->temp_max[1] = gl520_read_value(client,
  						GL520_REG_TEMP_MAX[1]);
  			data->temp_max_hyst[1] = gl520_read_value(client,
  						GL520_REG_TEMP_MAX_HYST[1]);

  		} else {

  			data->in_input[4] = gl520_read_value(client,
  						GL520_REG_IN_INPUT[4]);
  			data->in_min[4] = gl520_read_value(client,
  						GL520_REG_IN_MIN[4]);
  			data->in_max[4] = gl520_read_value(client,
  						GL520_REG_IN_MAX[4]);

  		}
  
  		data->last_updated = jiffies;
  		data->valid = 1;
  	}

  	mutex_unlock(&data->update_lock);

  
  	return data;
  }
  
  
  static int __init sensors_gl520sm_init(void)
  {
  	return i2c_add_driver(&gl520_driver);
  }
  
  static void __exit sensors_gl520sm_exit(void)
  {
  	i2c_del_driver(&gl520_driver);
  }
  
  
  MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "

  	"Kyösti Mälkki <kmalkki@cc.hut.fi>, "

  	"Maarten Deprez <maartendeprez@users.sourceforge.net>");
  MODULE_DESCRIPTION("GL520SM driver");
  MODULE_LICENSE("GPL");
  
  module_init(sensors_gl520sm_init);
  module_exit(sensors_gl520sm_exit);