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lm63.c

/*
 * lm63.c - driver for the National Semiconductor LM63 temperature sensor
 *          with integrated fan control
 * Copyright (C) 2004-2006  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>

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

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

/*
 * Insmod parameters
 */

I2C_CLIENT_INSMOD_1(lm63);

/*
 * The LM63 registers
 */

#define LM63_REG_CONFIG1            0x03
#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

/*
 * 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.
 */

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

/*
 * Functions declaration
 */

static int lm63_attach_adapter(struct i2c_adapter *adapter);
static int lm63_detach_client(struct i2c_client *client);

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

static int lm63_detect(struct i2c_adapter *adapter, int address, int kind);
static void lm63_init_client(struct i2c_client *client);

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

static struct i2c_driver lm63_driver = {
      .driver = {
            .name = "lm63",
      },
      .attach_adapter   = lm63_attach_adapter,
      .detach_client    = lm63_detach_client,
};

/*
 * Client data (each client gets its own)
 */

struct lm63_data {
      struct i2c_client client;
      struct device *hwmon_dev;
      struct mutex update_lock;
      char valid; /* zero until following fields are valid */
      unsigned long last_updated; /* in jiffies */

      /* 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[3];    /* 0: remote input
                     1: remote low limit
                     2: remote high limit */
      u8 temp2_crit_hyst;
      u8 alarms;
};

/*
 * 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\n", 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 = simple_strtoul(buf, NULL, 10);

      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);
      return sprintf(buf, "%d\n", data->pwm1_value >= 2 * data->pwm1_freq ?
                   255 : (data->pwm1_value * 255 + data->pwm1_freq) /
                   (2 * data->pwm1_freq));
}

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

      val = simple_strtoul(buf, NULL, 10);
      mutex_lock(&data->update_lock);
      data->pwm1_value = val <= 0 ? 0 :
                     val >= 255 ? 2 * data->pwm1_freq :
                     (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\n", data->config_fan & 0x20 ? 1 : 2);
}

static ssize_t show_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\n", TEMP8_FROM_REG(data->temp8[attr->index]));
}

static ssize_t set_temp8(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 = simple_strtol(buf, NULL, 10);

      mutex_lock(&data->update_lock);
      data->temp8[1] = TEMP8_TO_REG(val);
      i2c_smbus_write_byte_data(client, LM63_REG_LOCAL_HIGH, data->temp8[1]);
      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);
      return sprintf(buf, "%d\n", TEMP11_FROM_REG(data->temp11[attr->index]));
}

static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
                    const char *buf, size_t count)
{
      static const u8 reg[4] = {
            LM63_REG_REMOTE_LOW_MSB,
            LM63_REG_REMOTE_LOW_LSB,
            LM63_REG_REMOTE_HIGH_MSB,
            LM63_REG_REMOTE_HIGH_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 = simple_strtol(buf, NULL, 10);
      int nr = attr->index;

      mutex_lock(&data->update_lock);
      data->temp11[nr] = TEMP11_TO_REG(val);
      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\n", TEMP8_FROM_REG(data->temp8[2])
                   - 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 = simple_strtol(buf, NULL, 10);
      long hyst;

      mutex_lock(&data->update_lock);
      hyst = TEMP8_FROM_REG(data->temp8[2]) - val;
      i2c_smbus_write_byte_data(client, LM63_REG_REMOTE_TCRIT_HYST,
                          HYST_TO_REG(hyst));
      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\n", 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\n", (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_temp8, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_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_crit, S_IRUGO, show_temp8, NULL, 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 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_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,
      NULL
};

static const struct attribute_group lm63_group = {
      .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
 */

static int lm63_attach_adapter(struct i2c_adapter *adapter)
{
      if (!(adapter->class & I2C_CLASS_HWMON))
            return 0;
      return i2c_probe(adapter, &addr_data, lm63_detect);
}

/*
 * The following function does more than just detection. If detection
 * succeeds, it also registers the new chip.
 */
static int lm63_detect(struct i2c_adapter *adapter, int address, int kind)
{
      struct i2c_client *new_client;
      struct lm63_data *data;
      int err = 0;

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

      if (!(data = kzalloc(sizeof(struct lm63_data), GFP_KERNEL))) {
            err = -ENOMEM;
            goto exit;
      }

      /* The common I2C client data is placed right before the
         LM63-specific data. */
      new_client = &data->client;
      i2c_set_clientdata(new_client, data);
      new_client->addr = address;
      new_client->adapter = adapter;
      new_client->driver = &lm63_driver;
      new_client->flags = 0;

      /* Default to an LM63 if forced */
      if (kind == 0)
            kind = lm63;

      if (kind < 0) { /* must identify */
            u8 man_id, chip_id, reg_config1, reg_config2;
            u8 reg_alert_status, reg_alert_mask;

            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 */
             && chip_id == 0x41 /* LM63 */
             && (reg_config1 & 0x18) == 0x00
             && (reg_config2 & 0xF8) == 0x00
             && (reg_alert_status & 0x20) == 0x00
             && (reg_alert_mask & 0xA4) == 0xA4) {
                  kind = lm63;
            } else { /* failed */
                  dev_dbg(&adapter->dev, "Unsupported chip "
                        "(man_id=0x%02X, chip_id=0x%02X).\n",
                        man_id, chip_id);
                  goto exit_free;
            }
      }

      strlcpy(new_client->name, "lm63", 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 LM63 chip */
      lm63_init_client(new_client);

      /* Register sysfs hooks */
      if ((err = sysfs_create_group(&new_client->dev.kobj,
                              &lm63_group)))
            goto exit_detach;
      if (data->config & 0x04) { /* tachometer enabled */
            if ((err = sysfs_create_group(&new_client->dev.kobj,
                                    &lm63_group_fan1)))
                  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_detach:
      i2c_detach_client(new_client);
exit_free:
      kfree(data);
exit:
      return err;
}

/* Idealy 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);

      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\n");
            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;

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

static int lm63_detach_client(struct i2c_client *client)
{
      struct lm63_data *data = i2c_get_clientdata(client);
      int err;

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

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

      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);

      mutex_lock(&data->update_lock);

      if (time_after(jiffies, data->last_updated + HZ) || !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->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);

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