[PATCH] I2C: Move hwmon drivers (2/3)

Part 2: Move the driver files themselves.

Note that the patch "adds trailing whitespace", because it does move the
files as-is, and some files happen to have trailing whitespace.

From: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 601 insertions, 0 deletions

diff --git a/drivers/hwmon/lm80.c b/drivers/hwmon/lm80.c
new file mode 100644
index 000000000000..8100595feb44
--- /dev/null
+++ b/drivers/hwmon/lm80.c
@@ -0,0 +1,601 @@
+/*
+ * 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>
+
+/* 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 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 */
+        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_free:
+        kfree(data);
+exit:
+        return err;
+}
+
+static int lm80_detach_client(struct i2c_client *client)
+{
+        int err;
+
+        if ((err = i2c_detach_client(client))) {
+                dev_err(&client->dev, "Client deregistration failed, "
+                        "client not detached.\n");
+                return err;
+        }
+
+        kfree(i2c_get_clientdata(client));
+        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);