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gl520sm.c

/*
    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-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 unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };

/* Insmod parameters */
I2C_CLIENT_INSMOD_1(gl520sm);

/* 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

#define GL520_REG_IN0_INPUT         0x15
#define GL520_REG_IN0_LIMIT         0x0c
#define GL520_REG_IN0_MIN           GL520_REG_IN0_LIMIT
#define GL520_REG_IN0_MAX           GL520_REG_IN0_LIMIT

#define GL520_REG_IN1_INPUT         0x14
#define GL520_REG_IN1_LIMIT         0x09
#define GL520_REG_IN1_MIN           GL520_REG_IN1_LIMIT
#define GL520_REG_IN1_MAX           GL520_REG_IN1_LIMIT

#define GL520_REG_IN2_INPUT         0x13
#define GL520_REG_IN2_LIMIT         0x0a
#define GL520_REG_IN2_MIN           GL520_REG_IN2_LIMIT
#define GL520_REG_IN2_MAX           GL520_REG_IN2_LIMIT

#define GL520_REG_IN3_INPUT         0x0d
#define GL520_REG_IN3_LIMIT         0x0b
#define GL520_REG_IN3_MIN           GL520_REG_IN3_LIMIT
#define GL520_REG_IN3_MAX           GL520_REG_IN3_LIMIT

#define GL520_REG_IN4_INPUT         0x0e
#define GL520_REG_IN4_MAX           0x17
#define GL520_REG_IN4_MIN           0x18

#define GL520_REG_TEMP1_INPUT       0x04
#define GL520_REG_TEMP1_MAX         0x05
#define GL520_REG_TEMP1_MAX_HYST    0x06

#define GL520_REG_TEMP2_INPUT       0x0e
#define GL520_REG_TEMP2_MAX         0x17
#define GL520_REG_TEMP2_MAX_HYST    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_attach_adapter(struct i2c_adapter *adapter);
static int gl520_detect(struct i2c_adapter *adapter, int address, int kind);
static void gl520_init_client(struct i2c_client *client);
static int gl520_detach_client(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 struct i2c_driver gl520_driver = {
      .driver = {
            .name = "gl520sm",
      },
      .id         = I2C_DRIVERID_GL520,
      .attach_adapter   = gl520_attach_adapter,
      .detach_client    = gl520_detach_client,
};

/* Client data */
struct gl520_data {
      struct i2c_client client;
      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
 */

#define sysfs_r(type, n, item, reg) \
static ssize_t get_##type##item (struct gl520_data *, char *, int); \
static ssize_t get_##type##n##item (struct device *, struct device_attribute *attr, char *); \
static ssize_t get_##type##n##item (struct device *dev, struct device_attribute *attr, char *buf) \
{ \
      struct gl520_data *data = gl520_update_device(dev); \
      return get_##type##item(data, buf, (n)); \
}

#define sysfs_w(type, n, item, reg) \
static ssize_t set_##type##item (struct i2c_client *, struct gl520_data *, const char *, size_t, int, int); \
static ssize_t set_##type##n##item (struct device *, struct device_attribute *attr, const char *, size_t); \
static ssize_t set_##type##n##item (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); \
      return set_##type##item(client, data, buf, count, (n), reg); \
}

#define sysfs_rw_n(type, n, item, reg) \
sysfs_r(type, n, item, reg) \
sysfs_w(type, n, item, reg) \
static DEVICE_ATTR(type##n##item, S_IRUGO | S_IWUSR, get_##type##n##item, set_##type##n##item);

#define sysfs_ro_n(type, n, item, reg) \
sysfs_r(type, n, item, reg) \
static DEVICE_ATTR(type##n##item, S_IRUGO, get_##type##n##item, NULL);

#define sysfs_rw(type, item, reg) \
sysfs_r(type, 0, item, reg) \
sysfs_w(type, 0, item, reg) \
static DEVICE_ATTR(type##item, S_IRUGO | S_IWUSR, get_##type##0##item, set_##type##0##item);

#define sysfs_ro(type, item, reg) \
sysfs_r(type, 0, item, reg) \
static DEVICE_ATTR(type##item, S_IRUGO, get_##type##0##item, NULL);


#define sysfs_vid(n) \
sysfs_ro_n(cpu, n, _vid, GL520_REG_VID_INPUT)

#define sysfs_in(n) \
sysfs_ro_n(in, n, _input, GL520_REG_IN##n##INPUT) \
sysfs_rw_n(in, n, _min, GL520_REG_IN##n##_MIN) \
sysfs_rw_n(in, n, _max, GL520_REG_IN##n##_MAX) \

#define sysfs_fan(n) \
sysfs_ro_n(fan, n, _input, GL520_REG_FAN_INPUT) \
sysfs_rw_n(fan, n, _min, GL520_REG_FAN_MIN) \
sysfs_rw_n(fan, n, _div, GL520_REG_FAN_DIV)

#define sysfs_fan_off(n) \
sysfs_rw_n(fan, n, _off, GL520_REG_FAN_OFF) \

#define sysfs_temp(n) \
sysfs_ro_n(temp, n, _input, GL520_REG_TEMP##n##_INPUT) \
sysfs_rw_n(temp, n, _max, GL520_REG_TEMP##n##_MAX) \
sysfs_rw_n(temp, n, _max_hyst, GL520_REG_TEMP##n##_MAX_HYST)

#define sysfs_alarms() \
sysfs_ro(alarms, , GL520_REG_ALARMS) \
sysfs_rw(beep_enable, , GL520_REG_BEEP_ENABLE) \
sysfs_rw(beep_mask, , GL520_REG_BEEP_MASK)


sysfs_vid(0)

sysfs_in(0)
sysfs_in(1)
sysfs_in(2)
sysfs_in(3)
sysfs_in(4)

sysfs_fan(1)
sysfs_fan(2)
sysfs_fan_off(1)

sysfs_temp(1)
sysfs_temp(2)

sysfs_alarms()


static ssize_t get_cpu_vid(struct gl520_data *data, char *buf, int n)
{
      return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
}

#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 gl520_data *data, char *buf, int n)
{
      u8 r = data->in_input[n];

      if (n == 0)
            return sprintf(buf, "%d\n", VDD_FROM_REG(r));
      else
            return sprintf(buf, "%d\n", IN_FROM_REG(r));
}

static ssize_t get_in_min(struct gl520_data *data, char *buf, int n)
{
      u8 r = data->in_min[n];

      if (n == 0)
            return sprintf(buf, "%d\n", VDD_FROM_REG(r));
      else
            return sprintf(buf, "%d\n", IN_FROM_REG(r));
}

static ssize_t get_in_max(struct gl520_data *data, char *buf, int n)
{
      u8 r = data->in_max[n];

      if (n == 0)
            return sprintf(buf, "%d\n", VDD_FROM_REG(r));
      else
            return sprintf(buf, "%d\n", IN_FROM_REG(r));
}

static ssize_t set_in_min(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
      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, reg, (gl520_read_value(client, reg) & ~0xff) | r);
      else
            gl520_write_value(client, reg, r);

      mutex_unlock(&data->update_lock);
      return count;
}

static ssize_t set_in_max(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
      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, reg, (gl520_read_value(client, reg) & ~0xff00) | (r << 8));
      else
            gl520_write_value(client, reg, r);

      mutex_unlock(&data->update_lock);
      return count;
}

#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 gl520_data *data, char *buf, int n)
{
      return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_input[n - 1], data->fan_div[n - 1]));
}

static ssize_t get_fan_min(struct gl520_data *data, char *buf, int n)
{
      return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[n - 1], data->fan_div[n - 1]));
}

static ssize_t get_fan_div(struct gl520_data *data, char *buf, int n)
{
      return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[n - 1]));
}

static ssize_t get_fan_off(struct gl520_data *data, char *buf, int n)
{
      return sprintf(buf, "%d\n", data->fan_off);
}

static ssize_t set_fan_min(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
      unsigned long v = simple_strtoul(buf, NULL, 10);
      u8 r;

      mutex_lock(&data->update_lock);
      r = FAN_TO_REG(v, data->fan_div[n - 1]);
      data->fan_min[n - 1] = r;

      if (n == 1)
            gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xff00) | (r << 8));
      else
            gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xff) | r);

      data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
      if (data->fan_min[n - 1] == 0)
            data->alarm_mask &= (n == 1) ? ~0x20 : ~0x40;
      else
            data->alarm_mask |= (n == 1) ? 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 i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
      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!\n", v);
            return -EINVAL;
      }

      mutex_lock(&data->update_lock);
      data->fan_div[n - 1] = r;

      if (n == 1)
            gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xc0) | (r << 6));
      else
            gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x30) | (r << 4));

      mutex_unlock(&data->update_lock);
      return count;
}

static ssize_t set_fan_off(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
      u8 r = simple_strtoul(buf, NULL, 10)?1:0;

      mutex_lock(&data->update_lock);
      data->fan_off = r;
      gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x0c) | (r << 2));
      mutex_unlock(&data->update_lock);
      return count;
}

#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 gl520_data *data, char *buf, int n)
{
      return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_input[n - 1]));
}

static ssize_t get_temp_max(struct gl520_data *data, char *buf, int n)
{
      return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[n - 1]));
}

static ssize_t get_temp_max_hyst(struct gl520_data *data, char *buf, int n)
{
      return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max_hyst[n - 1]));
}

static ssize_t set_temp_max(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
      long v = simple_strtol(buf, NULL, 10);

      mutex_lock(&data->update_lock);
      data->temp_max[n - 1] = TEMP_TO_REG(v);
      gl520_write_value(client, reg, data->temp_max[n - 1]);
      mutex_unlock(&data->update_lock);
      return count;
}

static ssize_t set_temp_max_hyst(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
      long v = simple_strtol(buf, NULL, 10);

      mutex_lock(&data->update_lock);
      data->temp_max_hyst[n - 1] = TEMP_TO_REG(v);
      gl520_write_value(client, reg, data->temp_max_hyst[n - 1]);
      mutex_unlock(&data->update_lock);
      return count;
}

static ssize_t get_alarms(struct gl520_data *data, char *buf, int n)
{
      return sprintf(buf, "%d\n", data->alarms);
}

static ssize_t get_beep_enable(struct gl520_data *data, char *buf, int n)
{
      return sprintf(buf, "%d\n", data->beep_enable);
}

static ssize_t get_beep_mask(struct gl520_data *data, char *buf, int n)
{
      return sprintf(buf, "%d\n", data->beep_mask);
}

static ssize_t set_beep_enable(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
      u8 r = simple_strtoul(buf, NULL, 10)?0:1;

      mutex_lock(&data->update_lock);
      data->beep_enable = !r;
      gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x04) | (r << 2));
      mutex_unlock(&data->update_lock);
      return count;
}

static ssize_t set_beep_mask(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
      u8 r = simple_strtoul(buf, NULL, 10);
      
      mutex_lock(&data->update_lock);
      r &= data->alarm_mask;
      data->beep_mask = r;
      gl520_write_value(client, reg, r);
      mutex_unlock(&data->update_lock);
      return count;
}

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

      &dev_attr_in0_input.attr,
      &dev_attr_in0_min.attr,
      &dev_attr_in0_max.attr,
      &dev_attr_in1_input.attr,
      &dev_attr_in1_min.attr,
      &dev_attr_in1_max.attr,
      &dev_attr_in2_input.attr,
      &dev_attr_in2_min.attr,
      &dev_attr_in2_max.attr,
      &dev_attr_in3_input.attr,
      &dev_attr_in3_min.attr,
      &dev_attr_in3_max.attr,

      &dev_attr_fan1_input.attr,
      &dev_attr_fan1_min.attr,
      &dev_attr_fan1_div.attr,
      &dev_attr_fan1_off.attr,
      &dev_attr_fan2_input.attr,
      &dev_attr_fan2_min.attr,
      &dev_attr_fan2_div.attr,

      &dev_attr_temp1_input.attr,
      &dev_attr_temp1_max.attr,
      &dev_attr_temp1_max_hyst.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[] = {
      &dev_attr_in4_input.attr,
      &dev_attr_in4_min.attr,
      &dev_attr_in4_max.attr,

      &dev_attr_temp2_input.attr,
      &dev_attr_temp2_max.attr,
      &dev_attr_temp2_max_hyst.attr,
      NULL
};

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


/*
 * Real code
 */

static int gl520_attach_adapter(struct i2c_adapter *adapter)
{
      if (!(adapter->class & I2C_CLASS_HWMON))
            return 0;
      return i2c_probe(adapter, &addr_data, gl520_detect);
}

static int gl520_detect(struct i2c_adapter *adapter, int address, int kind)
{
      struct i2c_client *new_client;
      struct gl520_data *data;
      int err = 0;

      if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
                             I2C_FUNC_SMBUS_WORD_DATA))
            goto exit;

      /* OK. For now, we presume we have a valid client. We now create the
         client structure, even though we cannot fill it completely yet.
         But it allows us to access gl520_{read,write}_value. */

      if (!(data = kzalloc(sizeof(struct gl520_data), GFP_KERNEL))) {
            err = -ENOMEM;
            goto exit;
      }

      new_client = &data->client;
      i2c_set_clientdata(new_client, data);
      new_client->addr = address;
      new_client->adapter = adapter;
      new_client->driver = &gl520_driver;
      new_client->flags = 0;

      /* Determine the chip type. */
      if (kind < 0) {
            if ((gl520_read_value(new_client, GL520_REG_CHIP_ID) != 0x20) ||
                ((gl520_read_value(new_client, GL520_REG_REVISION) & 0x7f) != 0x00) ||
                ((gl520_read_value(new_client, GL520_REG_CONF) & 0x80) != 0x00)) {
                  dev_dbg(&new_client->dev, "Unknown chip type, skipping\n");
                  goto exit_free;
            }
      }

      /* Fill in the remaining client fields */
      strlcpy(new_client->name, "gl520sm", I2C_NAME_SIZE);
      data->valid = 0;
      mutex_init(&data->update_lock);

      /* Tell the I2C layer a new client has arrived */
      if ((err = i2c_attach_client(new_client)))
            goto exit_free;

      /* Initialize the GL520SM chip */
      gl520_init_client(new_client);

      /* Register sysfs hooks */
      if ((err = sysfs_create_group(&new_client->dev.kobj, &gl520_group)))
            goto exit_detach;

      if (data->two_temps) {
            if ((err = device_create_file(&new_client->dev,
                                    &dev_attr_temp2_input))
             || (err = device_create_file(&new_client->dev,
                                    &dev_attr_temp2_max))
             || (err = device_create_file(&new_client->dev,
                                    &dev_attr_temp2_max_hyst)))
                  goto exit_remove_files;
      } else {
            if ((err = device_create_file(&new_client->dev,
                                    &dev_attr_in4_input))
             || (err = device_create_file(&new_client->dev,
                                    &dev_attr_in4_min))
             || (err = device_create_file(&new_client->dev,
                                    &dev_attr_in4_max)))
                  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, &gl520_group);
      sysfs_remove_group(&new_client->dev.kobj, &gl520_group_opt);
exit_detach:
      i2c_detach_client(new_client);
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_detach_client(struct i2c_client *client)
{
      struct gl520_data *data = i2c_get_clientdata(client);
      int err;

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

      if ((err = i2c_detach_client(client)))
            return err;

      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 swab16(i2c_smbus_read_word_data(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_data(client, reg, swab16(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;

      mutex_lock(&data->update_lock);

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

            dev_dbg(&client->dev, "Starting gl520sm update\n");

            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;

            val = gl520_read_value(client, GL520_REG_IN0_LIMIT);
            data->in_min[0] = val & 0xff;
            data->in_max[0] = (val >> 8) & 0xff;
            val = gl520_read_value(client, GL520_REG_IN1_LIMIT);
            data->in_min[1] = val & 0xff;
            data->in_max[1] = (val >> 8) & 0xff;
            val = gl520_read_value(client, GL520_REG_IN2_LIMIT);
            data->in_min[2] = val & 0xff;
            data->in_max[2] = (val >> 8) & 0xff;
            val = gl520_read_value(client, GL520_REG_IN3_LIMIT);
            data->in_min[3] = val & 0xff;
            data->in_max[3] = (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_TEMP1_INPUT);
            data->temp_max[0] = gl520_read_value(client, GL520_REG_TEMP1_MAX);
            data->temp_max_hyst[0] = gl520_read_value(client, GL520_REG_TEMP1_MAX_HYST);

            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);

            data->in_input[0] = gl520_read_value(client, GL520_REG_IN0_INPUT);
            data->in_input[1] = gl520_read_value(client, GL520_REG_IN1_INPUT);
            data->in_input[2] = gl520_read_value(client, GL520_REG_IN2_INPUT);
            data->in_input[3] = gl520_read_value(client, GL520_REG_IN3_INPUT);

            /* Temp1 and Vin4 are the same input */
            if (data->two_temps) {
                  data->temp_input[1] = gl520_read_value(client, GL520_REG_TEMP2_INPUT);
                  data->temp_max[1] = gl520_read_value(client, GL520_REG_TEMP2_MAX);
                  data->temp_max_hyst[1] = gl520_read_value(client, GL520_REG_TEMP2_MAX_HYST);
            } else {
                  data->in_input[4] = gl520_read_value(client, GL520_REG_IN4_INPUT);
                  data->in_min[4] = gl520_read_value(client, GL520_REG_IN4_MIN);
                  data->in_max[4] = gl520_read_value(client, GL520_REG_IN4_MAX);
            }

            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);

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