[PATCH] I2C hwmon: add hwmon sysfs class to drivers

[deliverable/linux.git] / drivers / hwmon / lm80.c

/*
 * lm80.c - From lm_sensors, Linux kernel modules for hardware
 * monitoring
 * Copyright (C) 1998, 1999  Frodo Looijaard <frodol@dds.nl>
 * and Philip Edelbrock <phil@netroedge.com>
 *
 * Ported to Linux 2.6 by Tiago Sousa <mirage@kaotik.org>
 *
 * 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/i2c-sensor.h>
#include <linux/hwmon.h>
#include <linux/err.h>

/* Addresses to scan */
static unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c,
                                        0x2d, 0x2e, 0x2f, I2C_CLIENT_END };
static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };

/* Insmod parameters */
SENSORS_INSMOD_1(lm80);

/* Many LM80 constants specified below */

/* The LM80 registers */
#define LM80_REG_IN_MAX(nr)             (0x2a + (nr) * 2)
#define LM80_REG_IN_MIN(nr)             (0x2b + (nr) * 2)
#define LM80_REG_IN(nr)                 (0x20 + (nr))

#define LM80_REG_FAN1                   0x28
#define LM80_REG_FAN2                   0x29
#define LM80_REG_FAN_MIN(nr)            (0x3b + (nr))

#define LM80_REG_TEMP                   0x27
#define LM80_REG_TEMP_HOT_MAX           0x38
#define LM80_REG_TEMP_HOT_HYST          0x39
#define LM80_REG_TEMP_OS_MAX            0x3a
#define LM80_REG_TEMP_OS_HYST           0x3b

#define LM80_REG_CONFIG                 0x00
#define LM80_REG_ALARM1                 0x01
#define LM80_REG_ALARM2                 0x02
#define LM80_REG_MASK1                  0x03
#define LM80_REG_MASK2                  0x04
#define LM80_REG_FANDIV                 0x05
#define LM80_REG_RES                    0x06


/* Conversions. Rounding and limit checking is only done on the TO_REG
   variants. Note that you should be a bit careful with which arguments
   these macros are called: arguments may be evaluated more than once.
   Fixing this is just not worth it. */

#define IN_TO_REG(val)          (SENSORS_LIMIT(((val)+5)/10,0,255))
#define IN_FROM_REG(val)        ((val)*10)

static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div)
{
        if (rpm == 0)
                return 255;
        rpm = SENSORS_LIMIT(rpm, 1, 1000000);
        return SENSORS_LIMIT((1350000 + rpm*div / 2) / (rpm*div), 1, 254);
}

#define FAN_FROM_REG(val,div)   ((val)==0?-1:\
                                (val)==255?0:1350000/((div)*(val)))

static inline long TEMP_FROM_REG(u16 temp)
{
        long res;

        temp >>= 4;
        if (temp < 0x0800)
                res = 625 * (long) temp;
        else
                res = ((long) temp - 0x01000) * 625;

        return res / 10;
}

#define TEMP_LIMIT_FROM_REG(val)        (((val)>0x80?(val)-0x100:(val))*1000)

#define TEMP_LIMIT_TO_REG(val)          SENSORS_LIMIT((val)<0?\
                                        ((val)-500)/1000:((val)+500)/1000,0,255)

#define DIV_FROM_REG(val)               (1 << (val))

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

struct lm80_data {
        struct i2c_client client;
        struct class_device *class_dev;
        struct semaphore update_lock;
        char valid;             /* !=0 if following fields are valid */
        unsigned long last_updated;     /* In jiffies */

        u8 in[7];               /* Register value */
        u8 in_max[7];           /* Register value */
        u8 in_min[7];           /* Register value */
        u8 fan[2];              /* Register value */
        u8 fan_min[2];          /* Register value */
        u8 fan_div[2];          /* Register encoding, shifted right */
        u16 temp;               /* Register values, shifted right */
        u8 temp_hot_max;        /* Register value */
        u8 temp_hot_hyst;       /* Register value */
        u8 temp_os_max;         /* Register value */
        u8 temp_os_hyst;        /* Register value */
        u16 alarms;             /* Register encoding, combined */
};

/* 
 * Functions declaration
 */

static int lm80_attach_adapter(struct i2c_adapter *adapter);
static int lm80_detect(struct i2c_adapter *adapter, int address, int kind);
static void lm80_init_client(struct i2c_client *client);
static int lm80_detach_client(struct i2c_client *client);
static struct lm80_data *lm80_update_device(struct device *dev);
static int lm80_read_value(struct i2c_client *client, u8 reg);
static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value);

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

static struct i2c_driver lm80_driver = {
        .owner          = THIS_MODULE,
        .name           = "lm80",
        .id             = I2C_DRIVERID_LM80,
        .flags          = I2C_DF_NOTIFY,
        .attach_adapter = lm80_attach_adapter,
        .detach_client  = lm80_detach_client,
};

/*
 * Sysfs stuff
 */

#define show_in(suffix, value) \
static ssize_t show_in_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
        struct lm80_data *data = lm80_update_device(dev); \
        return sprintf(buf, "%d\n", IN_FROM_REG(data->value)); \
}
show_in(min0, in_min[0]);
show_in(min1, in_min[1]);
show_in(min2, in_min[2]);
show_in(min3, in_min[3]);
show_in(min4, in_min[4]);
show_in(min5, in_min[5]);
show_in(min6, in_min[6]);
show_in(max0, in_max[0]);
show_in(max1, in_max[1]);
show_in(max2, in_max[2]);
show_in(max3, in_max[3]);
show_in(max4, in_max[4]);
show_in(max5, in_max[5]);
show_in(max6, in_max[6]);
show_in(input0, in[0]);
show_in(input1, in[1]);
show_in(input2, in[2]);
show_in(input3, in[3]);
show_in(input4, in[4]);
show_in(input5, in[5]);
show_in(input6, in[6]);

#define set_in(suffix, value, reg) \
static ssize_t set_in_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
        size_t count) \
{ \
        struct i2c_client *client = to_i2c_client(dev); \
        struct lm80_data *data = i2c_get_clientdata(client); \
        long val = simple_strtol(buf, NULL, 10); \
 \
        down(&data->update_lock);\
        data->value = IN_TO_REG(val); \
        lm80_write_value(client, reg, data->value); \
        up(&data->update_lock);\
        return count; \
}
set_in(min0, in_min[0], LM80_REG_IN_MIN(0));
set_in(min1, in_min[1], LM80_REG_IN_MIN(1));
set_in(min2, in_min[2], LM80_REG_IN_MIN(2));
set_in(min3, in_min[3], LM80_REG_IN_MIN(3));
set_in(min4, in_min[4], LM80_REG_IN_MIN(4));
set_in(min5, in_min[5], LM80_REG_IN_MIN(5));
set_in(min6, in_min[6], LM80_REG_IN_MIN(6));
set_in(max0, in_max[0], LM80_REG_IN_MAX(0));
set_in(max1, in_max[1], LM80_REG_IN_MAX(1));
set_in(max2, in_max[2], LM80_REG_IN_MAX(2));
set_in(max3, in_max[3], LM80_REG_IN_MAX(3));
set_in(max4, in_max[4], LM80_REG_IN_MAX(4));
set_in(max5, in_max[5], LM80_REG_IN_MAX(5));
set_in(max6, in_max[6], LM80_REG_IN_MAX(6));

#define show_fan(suffix, value, div) \
static ssize_t show_fan_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
        struct lm80_data *data = lm80_update_device(dev); \
        return sprintf(buf, "%d\n", FAN_FROM_REG(data->value, \
                       DIV_FROM_REG(data->div))); \
}
show_fan(min1, fan_min[0], fan_div[0]);
show_fan(min2, fan_min[1], fan_div[1]);
show_fan(input1, fan[0], fan_div[0]);
show_fan(input2, fan[1], fan_div[1]);

#define show_fan_div(suffix, value) \
static ssize_t show_fan_div##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
        struct lm80_data *data = lm80_update_device(dev); \
        return sprintf(buf, "%d\n", DIV_FROM_REG(data->value)); \
}
show_fan_div(1, fan_div[0]);
show_fan_div(2, fan_div[1]);

#define set_fan(suffix, value, reg, div) \
static ssize_t set_fan_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
        size_t count) \
{ \
        struct i2c_client *client = to_i2c_client(dev); \
        struct lm80_data *data = i2c_get_clientdata(client); \
        long val = simple_strtoul(buf, NULL, 10); \
 \
        down(&data->update_lock);\
        data->value = FAN_TO_REG(val, DIV_FROM_REG(data->div)); \
        lm80_write_value(client, reg, data->value); \
        up(&data->update_lock);\
        return count; \
}
set_fan(min1, fan_min[0], LM80_REG_FAN_MIN(1), fan_div[0]);
set_fan(min2, fan_min[1], LM80_REG_FAN_MIN(2), fan_div[1]);

/* Note: we save and restore the fan minimum here, because its value is
   determined in part by the fan divisor.  This follows the principle of
   least suprise; the user doesn't expect the fan minimum to change just
   because the divisor changed. */
static ssize_t set_fan_div(struct device *dev, const char *buf,
        size_t count, int nr)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct lm80_data *data = i2c_get_clientdata(client);
        unsigned long min, val = simple_strtoul(buf, NULL, 10);
        u8 reg;

        /* Save fan_min */
        down(&data->update_lock);
        min = FAN_FROM_REG(data->fan_min[nr],
                           DIV_FROM_REG(data->fan_div[nr]));

        switch (val) {
        case 1: data->fan_div[nr] = 0; break;
        case 2: data->fan_div[nr] = 1; break;
        case 4: data->fan_div[nr] = 2; break;
        case 8: data->fan_div[nr] = 3; break;
        default:
                dev_err(&client->dev, "fan_div value %ld not "
                        "supported. Choose one of 1, 2, 4 or 8!\n", val);
                up(&data->update_lock);
                return -EINVAL;
        }

        reg = (lm80_read_value(client, LM80_REG_FANDIV) & ~(3 << (2 * (nr + 1))))
            | (data->fan_div[nr] << (2 * (nr + 1)));
        lm80_write_value(client, LM80_REG_FANDIV, reg);

        /* Restore fan_min */
        data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
        lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
        up(&data->update_lock);

        return count;
}

#define set_fan_div(number) \
static ssize_t set_fan_div##number(struct device *dev, struct device_attribute *attr, const char *buf, \
        size_t count) \
{ \
        return set_fan_div(dev, buf, count, number - 1); \
}
set_fan_div(1);
set_fan_div(2);

static ssize_t show_temp_input1(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct lm80_data *data = lm80_update_device(dev);
        return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp));
}

#define show_temp(suffix, value) \
static ssize_t show_temp_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
        struct lm80_data *data = lm80_update_device(dev); \
        return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \
}
show_temp(hot_max, temp_hot_max);
show_temp(hot_hyst, temp_hot_hyst);
show_temp(os_max, temp_os_max);
show_temp(os_hyst, temp_os_hyst);

#define set_temp(suffix, value, reg) \
static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
        size_t count) \
{ \
        struct i2c_client *client = to_i2c_client(dev); \
        struct lm80_data *data = i2c_get_clientdata(client); \
        long val = simple_strtoul(buf, NULL, 10); \
 \
        down(&data->update_lock); \
        data->value = TEMP_LIMIT_TO_REG(val); \
        lm80_write_value(client, reg, data->value); \
        up(&data->update_lock); \
        return count; \
}
set_temp(hot_max, temp_hot_max, LM80_REG_TEMP_HOT_MAX);
set_temp(hot_hyst, temp_hot_hyst, LM80_REG_TEMP_HOT_HYST);
set_temp(os_max, temp_os_max, LM80_REG_TEMP_OS_MAX);
set_temp(os_hyst, temp_os_hyst, LM80_REG_TEMP_OS_HYST);

static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
{
        struct lm80_data *data = lm80_update_device(dev);
        return sprintf(buf, "%u\n", data->alarms);
}

static DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min0, set_in_min0);
static DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min1, set_in_min1);
static DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min2, set_in_min2);
static DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO, show_in_min3, set_in_min3);
static DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO, show_in_min4, set_in_min4);
static DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO, show_in_min5, set_in_min5);
static DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO, show_in_min6, set_in_min6);
static DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max0, set_in_max0);
static DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max1, set_in_max1);
static DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max2, set_in_max2);
static DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO, show_in_max3, set_in_max3);
static DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO, show_in_max4, set_in_max4);
static DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO, show_in_max5, set_in_max5);
static DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO, show_in_max6, set_in_max6);
static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
static DEVICE_ATTR(in4_input, S_IRUGO, show_in_input4, NULL);
static DEVICE_ATTR(in5_input, S_IRUGO, show_in_input5, NULL);
static DEVICE_ATTR(in6_input, S_IRUGO, show_in_input6, NULL);
static DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min1,
    set_fan_min1);
static DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min2,
    set_fan_min2);
static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input1, NULL);
static DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input2, NULL);
static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div1, set_fan_div1);
static DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div2, set_fan_div2);
static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_hot_max,
    set_temp_hot_max);
static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hot_hyst,
    set_temp_hot_hyst);
static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_os_max,
    set_temp_os_max);
static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_os_hyst,
    set_temp_os_hyst);
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);

/*
 * Real code
 */

static int lm80_attach_adapter(struct i2c_adapter *adapter)
{
        if (!(adapter->class & I2C_CLASS_HWMON))
                return 0;
        return i2c_detect(adapter, &addr_data, lm80_detect);
}

int lm80_detect(struct i2c_adapter *adapter, int address, int kind)
{
        int i, cur;
        struct i2c_client *new_client;
        struct lm80_data *data;
        int err = 0;
        const char *name;

        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_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 lm80_{read,write}_value. */
        if (!(data = kmalloc(sizeof(struct lm80_data), GFP_KERNEL))) {
                err = -ENOMEM;
                goto exit;
        }
        memset(data, 0, sizeof(struct lm80_data));

        new_client = &data->client;
        i2c_set_clientdata(new_client, data);
        new_client->addr = address;
        new_client->adapter = adapter;
        new_client->driver = &lm80_driver;
        new_client->flags = 0;

        /* Now, we do the remaining detection. It is lousy. */
        if (lm80_read_value(new_client, LM80_REG_ALARM2) & 0xc0)
                goto error_free;
        for (i = 0x2a; i <= 0x3d; i++) {
                cur = i2c_smbus_read_byte_data(new_client, i);
                if ((i2c_smbus_read_byte_data(new_client, i + 0x40) != cur)
                 || (i2c_smbus_read_byte_data(new_client, i + 0x80) != cur)
                 || (i2c_smbus_read_byte_data(new_client, i + 0xc0) != cur))
                    goto error_free;
        }

        /* Determine the chip type - only one kind supported! */
        kind = lm80;
        name = "lm80";

        /* Fill in the remaining client fields and put it into the global list */
        strlcpy(new_client->name, name, I2C_NAME_SIZE);
        data->valid = 0;
        init_MUTEX(&data->update_lock);

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

        /* Initialize the LM80 chip */
        lm80_init_client(new_client);

        /* A few vars need to be filled upon startup */
        data->fan_min[0] = lm80_read_value(new_client, LM80_REG_FAN_MIN(1));
        data->fan_min[1] = lm80_read_value(new_client, LM80_REG_FAN_MIN(2));

        /* Register sysfs hooks */
        data->class_dev = hwmon_device_register(&new_client->dev);
        if (IS_ERR(data->class_dev)) {
                err = PTR_ERR(data->class_dev);
                goto error_detach;
        }

        device_create_file(&new_client->dev, &dev_attr_in0_min);
        device_create_file(&new_client->dev, &dev_attr_in1_min);
        device_create_file(&new_client->dev, &dev_attr_in2_min);
        device_create_file(&new_client->dev, &dev_attr_in3_min);
        device_create_file(&new_client->dev, &dev_attr_in4_min);
        device_create_file(&new_client->dev, &dev_attr_in5_min);
        device_create_file(&new_client->dev, &dev_attr_in6_min);
        device_create_file(&new_client->dev, &dev_attr_in0_max);
        device_create_file(&new_client->dev, &dev_attr_in1_max);
        device_create_file(&new_client->dev, &dev_attr_in2_max);
        device_create_file(&new_client->dev, &dev_attr_in3_max);
        device_create_file(&new_client->dev, &dev_attr_in4_max);
        device_create_file(&new_client->dev, &dev_attr_in5_max);
        device_create_file(&new_client->dev, &dev_attr_in6_max);
        device_create_file(&new_client->dev, &dev_attr_in0_input);
        device_create_file(&new_client->dev, &dev_attr_in1_input);
        device_create_file(&new_client->dev, &dev_attr_in2_input);
        device_create_file(&new_client->dev, &dev_attr_in3_input);
        device_create_file(&new_client->dev, &dev_attr_in4_input);
        device_create_file(&new_client->dev, &dev_attr_in5_input);
        device_create_file(&new_client->dev, &dev_attr_in6_input);
        device_create_file(&new_client->dev, &dev_attr_fan1_min);
        device_create_file(&new_client->dev, &dev_attr_fan2_min);
        device_create_file(&new_client->dev, &dev_attr_fan1_input);
        device_create_file(&new_client->dev, &dev_attr_fan2_input);
        device_create_file(&new_client->dev, &dev_attr_fan1_div);
        device_create_file(&new_client->dev, &dev_attr_fan2_div);
        device_create_file(&new_client->dev, &dev_attr_temp1_input);
        device_create_file(&new_client->dev, &dev_attr_temp1_max);
        device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
        device_create_file(&new_client->dev, &dev_attr_temp1_crit);
        device_create_file(&new_client->dev, &dev_attr_temp1_crit_hyst);
        device_create_file(&new_client->dev, &dev_attr_alarms);

        return 0;

error_detach:
        i2c_detach_client(new_client);
error_free:
        kfree(data);
exit:
        return err;
}

static int lm80_detach_client(struct i2c_client *client)
{
        struct lm80_data *data = i2c_get_clientdata(client);
        int err;

        hwmon_device_unregister(data->class_dev);

        if ((err = i2c_detach_client(client))) {
                dev_err(&client->dev, "Client deregistration failed, "
                        "client not detached.\n");
                return err;
        }

        kfree(data);
        return 0;
}

static int lm80_read_value(struct i2c_client *client, u8 reg)
{
        return i2c_smbus_read_byte_data(client, reg);
}

static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value)
{
        return i2c_smbus_write_byte_data(client, reg, value);
}

/* Called when we have found a new LM80. */
static void lm80_init_client(struct i2c_client *client)
{
        /* Reset all except Watchdog values and last conversion values
           This sets fan-divs to 2, among others. This makes most other
           initializations unnecessary */
        lm80_write_value(client, LM80_REG_CONFIG, 0x80);
        /* Set 11-bit temperature resolution */
        lm80_write_value(client, LM80_REG_RES, 0x08);

        /* Start monitoring */
        lm80_write_value(client, LM80_REG_CONFIG, 0x01);
}

static struct lm80_data *lm80_update_device(struct device *dev)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct lm80_data *data = i2c_get_clientdata(client);
        int i;

        down(&data->update_lock);

        if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
                dev_dbg(&client->dev, "Starting lm80 update\n");
                for (i = 0; i <= 6; i++) {
                        data->in[i] =
                            lm80_read_value(client, LM80_REG_IN(i));
                        data->in_min[i] =
                            lm80_read_value(client, LM80_REG_IN_MIN(i));
                        data->in_max[i] =
                            lm80_read_value(client, LM80_REG_IN_MAX(i));
                }
                data->fan[0] = lm80_read_value(client, LM80_REG_FAN1);
                data->fan_min[0] =
                    lm80_read_value(client, LM80_REG_FAN_MIN(1));
                data->fan[1] = lm80_read_value(client, LM80_REG_FAN2);
                data->fan_min[1] =
                    lm80_read_value(client, LM80_REG_FAN_MIN(2));

                data->temp =
                    (lm80_read_value(client, LM80_REG_TEMP) << 8) |
                    (lm80_read_value(client, LM80_REG_RES) & 0xf0);
                data->temp_os_max =
                    lm80_read_value(client, LM80_REG_TEMP_OS_MAX);
                data->temp_os_hyst =
                    lm80_read_value(client, LM80_REG_TEMP_OS_HYST);
                data->temp_hot_max =
                    lm80_read_value(client, LM80_REG_TEMP_HOT_MAX);
                data->temp_hot_hyst =
                    lm80_read_value(client, LM80_REG_TEMP_HOT_HYST);

                i = lm80_read_value(client, LM80_REG_FANDIV);
                data->fan_div[0] = (i >> 2) & 0x03;
                data->fan_div[1] = (i >> 4) & 0x03;
                data->alarms = lm80_read_value(client, LM80_REG_ALARM1) +
                    (lm80_read_value(client, LM80_REG_ALARM2) << 8);
                data->last_updated = jiffies;
                data->valid = 1;
        }

        up(&data->update_lock);

        return data;
}

static int __init sensors_lm80_init(void)
{
        return i2c_add_driver(&lm80_driver);
}

static void __exit sensors_lm80_exit(void)
{
        i2c_del_driver(&lm80_driver);
}

MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
        "Philip Edelbrock <phil@netroedge.com>");
MODULE_DESCRIPTION("LM80 driver");
MODULE_LICENSE("GPL");

module_init(sensors_lm80_init);
module_exit(sensors_lm80_exit);