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/*

 * 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/hwmon.h>

#include <linux/err.h>

#include <linux/mutex.h>

/* Addresses to scan */

static unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c,

                                        0x2d, 0x2e, 0x2f, I2C_CLIENT_END };

/* Insmod parameters */

I2C_CLIENT_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 device *hwmon_dev;

        struct mutex 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 = {

        .driver = {

                .name   = "lm80",

        },

        .id             = I2C_DRIVERID_LM80,

        .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); \

 \

        mutex_lock(&data->update_lock);\

        data->value = IN_TO_REG(val); \

        lm80_write_value(client, reg, data->value); \

        mutex_unlock(&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); \

 \

        mutex_lock(&data->update_lock);\

        data->value = FAN_TO_REG(val, DIV_FROM_REG(data->div)); \

        lm80_write_value(client, reg, data->value); \

        mutex_unlock(&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 surprise; 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 */

        mutex_lock(&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);

                mutex_unlock(&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]);

        mutex_unlock(&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); \

 \

        mutex_lock(&data->update_lock); \

        data->value = TEMP_LIMIT_TO_REG(val); \

        lm80_write_value(client, reg, data->value); \

        mutex_unlock(&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_probe(adapter, &addr_data, lm80_detect);

}

static struct attribute *lm80_attributes[] = {

        &dev_attr_in0_min.attr,

        &dev_attr_in1_min.attr,

        &dev_attr_in2_min.attr,

        &dev_attr_in3_min.attr,

        &dev_attr_in4_min.attr,

        &dev_attr_in5_min.attr,

        &dev_attr_in6_min.attr,

        &dev_attr_in0_max.attr,

        &dev_attr_in1_max.attr,

        &dev_attr_in2_max.attr,

        &dev_attr_in3_max.attr,

        &dev_attr_in4_max.attr,

        &dev_attr_in5_max.attr,

        &dev_attr_in6_max.attr,

        &dev_attr_in0_input.attr,

        &dev_attr_in1_input.attr,

        &dev_attr_in2_input.attr,

        &dev_attr_in3_input.attr,

        &dev_attr_in4_input.attr,

        &dev_attr_in5_input.attr,

        &dev_attr_in6_input.attr,

        &dev_attr_fan1_min.attr,

        &dev_attr_fan2_min.attr,

        &dev_attr_fan1_input.attr,

        &dev_attr_fan2_input.attr,

        &dev_attr_fan1_div.attr,

        &dev_attr_fan2_div.attr,

        &dev_attr_temp1_input.attr,

        &dev_attr_temp1_max.attr,

        &dev_attr_temp1_max_hyst.attr,

        &dev_attr_temp1_crit.attr,

        &dev_attr_temp1_crit_hyst.attr,

        &dev_attr_alarms.attr,

        NULL

};

static const struct attribute_group lm80_group = {

        .attrs = lm80_attributes,

};

static 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 = kzalloc(sizeof(struct lm80_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 = &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;

        mutex_init(&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 */

        if ((err = sysfs_create_group(&new_client->dev.kobj, &lm80_group)))

                goto error_detach;

        data->hwmon_dev = hwmon_device_register(&new_client->dev);

        if (IS_ERR(data->hwmon_dev)) {

                err = PTR_ERR(data->hwmon_dev);

                goto error_remove;

        }

        return 0;

error_remove:

        sysfs_remove_group(&new_client->dev.kobj, &lm80_group);

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->hwmon_dev);

        sysfs_remove_group(&client->dev.kobj, &lm80_group);

        if ((err = i2c_detach_client(client)))

                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;

        mutex_lock(&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;

        }

        mutex_unlock(&data->update_lock);

        return data;

}

static int __init sensors_lm80_init(void)

{

        return i2c_add_driver(&lm80_driver);