Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[linux-2.6/linux-mips/linux-dm7025.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/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>

/* Addresses to scan */
static const 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",
        },
        .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) \
{ \
        int nr = to_sensor_dev_attr(attr)->index; \
        struct lm80_data *data = lm80_update_device(dev); \
        return sprintf(buf, "%d\n", IN_FROM_REG(data->value[nr])); \
}
show_in(min, in_min)
show_in(max, in_max)
show_in(input, in)

#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) \
{ \
        int nr = to_sensor_dev_attr(attr)->index; \
        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[nr] = IN_TO_REG(val); \
        lm80_write_value(client, reg(nr), data->value[nr]); \
        mutex_unlock(&data->update_lock);\
        return count; \
}
set_in(min, in_min, LM80_REG_IN_MIN)
set_in(max, in_max, LM80_REG_IN_MAX)

#define show_fan(suffix, value) \
static ssize_t show_fan_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
        int nr = to_sensor_dev_attr(attr)->index; \
        struct lm80_data *data = lm80_update_device(dev); \
        return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[nr], \
                       DIV_FROM_REG(data->fan_div[nr]))); \
}
show_fan(min, fan_min)
show_fan(input, fan)

static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
        char *buf)
{
        int nr = to_sensor_dev_attr(attr)->index;
        struct lm80_data *data = lm80_update_device(dev);
        return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
}

static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
        const char *buf, size_t count)
{
        int nr = to_sensor_dev_attr(attr)->index;
        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->fan_min[nr] = FAN_TO_REG(val, 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;
}

/* 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, struct device_attribute *attr,
        const char *buf, size_t count)
{
        int nr = to_sensor_dev_attr(attr)->index;
        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;
}

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 ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
                          char *buf)
{
        int bitnr = to_sensor_dev_attr(attr)->index;
        struct lm80_data *data = lm80_update_device(dev);
        return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
}

static SENSOR_DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO,
                show_in_min, set_in_min, 0);
static SENSOR_DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO,
                show_in_min, set_in_min, 1);
static SENSOR_DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO,
                show_in_min, set_in_min, 2);
static SENSOR_DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO,
                show_in_min, set_in_min, 3);
static SENSOR_DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO,
                show_in_min, set_in_min, 4);
static SENSOR_DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO,
                show_in_min, set_in_min, 5);
static SENSOR_DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO,
                show_in_min, set_in_min, 6);
static SENSOR_DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO,
                show_in_max, set_in_max, 0);
static SENSOR_DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO,
                show_in_max, set_in_max, 1);
static SENSOR_DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO,
                show_in_max, set_in_max, 2);
static SENSOR_DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO,
                show_in_max, set_in_max, 3);
static SENSOR_DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO,
                show_in_max, set_in_max, 4);
static SENSOR_DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO,
                show_in_max, set_in_max, 5);
static SENSOR_DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO,
                show_in_max, set_in_max, 6);
static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in_input, NULL, 0);
static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in_input, NULL, 1);
static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in_input, NULL, 2);
static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in_input, NULL, 3);
static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in_input, NULL, 4);
static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, show_in_input, NULL, 5);
static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, show_in_input, NULL, 6);
static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO,
                show_fan_min, set_fan_min, 0);
static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO,
                show_fan_min, set_fan_min, 1);
static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO,
                show_fan_div, set_fan_div, 0);
static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO,
                show_fan_div, set_fan_div, 1);
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);
static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 5);
static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 10);
static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 11);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 8);
static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 13);

/*
 * 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[] = {
        &sensor_dev_attr_in0_min.dev_attr.attr,
        &sensor_dev_attr_in1_min.dev_attr.attr,
        &sensor_dev_attr_in2_min.dev_attr.attr,
        &sensor_dev_attr_in3_min.dev_attr.attr,
        &sensor_dev_attr_in4_min.dev_attr.attr,
        &sensor_dev_attr_in5_min.dev_attr.attr,
        &sensor_dev_attr_in6_min.dev_attr.attr,
        &sensor_dev_attr_in0_max.dev_attr.attr,
        &sensor_dev_attr_in1_max.dev_attr.attr,
        &sensor_dev_attr_in2_max.dev_attr.attr,
        &sensor_dev_attr_in3_max.dev_attr.attr,
        &sensor_dev_attr_in4_max.dev_attr.attr,
        &sensor_dev_attr_in5_max.dev_attr.attr,
        &sensor_dev_attr_in6_max.dev_attr.attr,
        &sensor_dev_attr_in0_input.dev_attr.attr,
        &sensor_dev_attr_in1_input.dev_attr.attr,
        &sensor_dev_attr_in2_input.dev_attr.attr,
        &sensor_dev_attr_in3_input.dev_attr.attr,
        &sensor_dev_attr_in4_input.dev_attr.attr,
        &sensor_dev_attr_in5_input.dev_attr.attr,
        &sensor_dev_attr_in6_input.dev_attr.attr,
        &sensor_dev_attr_fan1_min.dev_attr.attr,
        &sensor_dev_attr_fan2_min.dev_attr.attr,
        &sensor_dev_attr_fan1_input.dev_attr.attr,
        &sensor_dev_attr_fan2_input.dev_attr.attr,
        &sensor_dev_attr_fan1_div.dev_attr.attr,
        &sensor_dev_attr_fan2_div.dev_attr.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,
        &sensor_dev_attr_in0_alarm.dev_attr.attr,
        &sensor_dev_attr_in1_alarm.dev_attr.attr,
        &sensor_dev_attr_in2_alarm.dev_attr.attr,
        &sensor_dev_attr_in3_alarm.dev_attr.attr,
        &sensor_dev_attr_in4_alarm.dev_attr.attr,
        &sensor_dev_attr_in5_alarm.dev_attr.attr,
        &sensor_dev_attr_in6_alarm.dev_attr.attr,
        &sensor_dev_attr_fan1_alarm.dev_attr.attr,
        &sensor_dev_attr_fan2_alarm.dev_attr.attr,
        &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
        &sensor_dev_attr_temp1_crit_alarm.dev_attr.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 *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;
        }

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

        /* Now, we do the remaining detection. It is lousy. */
        if (lm80_read_value(client, LM80_REG_ALARM2) & 0xc0)
                goto error_free;
        for (i = 0x2a; i <= 0x3d; i++) {
                cur = i2c_smbus_read_byte_data(client, i);
                if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur)
                 || (i2c_smbus_read_byte_data(client, i + 0x80) != cur)
                 || (i2c_smbus_read_byte_data(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 */
        strlcpy(client->name, name, I2C_NAME_SIZE);
        mutex_init(&data->update_lock);

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

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

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

        /* Register sysfs hooks */
        if ((err = sysfs_create_group(&client->dev.kobj, &lm80_group)))
                goto error_detach;

        data->hwmon_dev = hwmon_device_register(&client->dev);
        if (IS_ERR(data->hwmon_dev)) {
                err = PTR_ERR(data->hwmon_dev);
                goto error_remove;
        }

        return 0;

error_remove:
        sysfs_remove_group(&client->dev.kobj, &lm80_group);
error_detach:
        i2c_detach_client(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);
}

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);