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/*

    it87.c - Part of lm_sensors, Linux kernel modules for hardware

             monitoring.

    Supports: IT8705F  Super I/O chip w/LPC interface

              IT8712F  Super I/O chip w/LPC interface & SMbus

              Sis950   A clone of the IT8705F

    Copyright (c) 2001 Chris Gauthron <chrisg@0-in.com>

    Largely inspired by lm78.c of the same package

    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.

*/

/*

    djg@pdp8.net David Gesswein 7/18/01

    Modified to fix bug with not all alarms enabled.

    Added ability to read battery voltage and select temperature sensor

    type at module load time.

*/

#include <linux/module.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/i2c.h>

#include <linux/i2c-sensor.h>

#include <asm/io.h>

/* Addresses to scan */

static unsigned short normal_i2c[] = { I2C_CLIENT_END };

static unsigned short normal_i2c_range[] = { 0x20, 0x2f, I2C_CLIENT_END };

static unsigned int normal_isa[] = { 0x0290, I2C_CLIENT_ISA_END };

static unsigned int normal_isa_range[] = { I2C_CLIENT_ISA_END };

/* Insmod parameters */

SENSORS_INSMOD_4(it87, it8705, it8712, sis950);

/* Update battery voltage after every reading if true */

static int update_vbat = 0;

/* Enable Temp1 as thermal resistor */

/* Enable Temp2 as thermal diode */

/* Enable Temp3 as thermal resistor */

static int temp_type = 0x2a;

/* Many IT87 constants specified below */

/* Length of ISA address segment */

#define IT87_EXTENT 8

/* Where are the ISA address/data registers relative to the base address */

#define IT87_ADDR_REG_OFFSET 5

#define IT87_DATA_REG_OFFSET 6

/*----- The IT87 registers -----*/

#define IT87_REG_CONFIG        0x00

#define IT87_REG_ALARM1        0x01

#define IT87_REG_ALARM2        0x02

#define IT87_REG_ALARM3        0x03

#define IT87_REG_VID           0x0a

#define IT87_REG_FAN_DIV       0x0b

/* Monitors: 9 voltage (0 to 7, battery), 3 temp (1 to 3), 3 fan (1 to 3) */

#define IT87_REG_FAN(nr)       (0x0d + (nr))

#define IT87_REG_FAN_MIN(nr)   (0x10 + (nr))

#define IT87_REG_FAN_CTRL      0x13

#define IT87_REG_VIN(nr)       (0x20 + (nr))

#define IT87_REG_TEMP(nr)      (0x29 + (nr))

#define IT87_REG_VIN_MAX(nr)   (0x30 + (nr) * 2)

#define IT87_REG_VIN_MIN(nr)   (0x31 + (nr) * 2)

#define IT87_REG_TEMP_HIGH(nr) (0x40 + ((nr) * 2))

#define IT87_REG_TEMP_LOW(nr)  (0x41 + ((nr) * 2))

#define IT87_REG_I2C_ADDR      0x48

#define IT87_REG_VIN_ENABLE    0x50

#define IT87_REG_TEMP_ENABLE   0x51

#define IT87_REG_CHIPID        0x58

#define IN_TO_REG(val)  (SENSORS_LIMIT((((val) * 10 + 8)/16),0,255))

#define IN_FROM_REG(val) (((val) *  16) / 10)

static inline u8 FAN_TO_REG(long rpm, int 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/((val)*(div)))

#define TEMP_TO_REG(val) (SENSORS_LIMIT(((val)<0?(((val)-5)/10):\

                                        ((val)+5)/10),0,255))

#define TEMP_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*10)

#define VID_FROM_REG(val) ((val)==0x1f?0:(val)>=0x10?510-(val)*10:\

                                205-(val)*5)

#define ALARMS_FROM_REG(val) (val)

static int log2(int val)

{

        int answer = 0;

        while ((val >>= 1))

                answer++;

        return answer;

}

#define DIV_TO_REG(val) log2(val)

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

/* Initial limits. Use the config file to set better limits. */

#define IT87_INIT_IN_0 170

#define IT87_INIT_IN_1 250

#define IT87_INIT_IN_2 (330 / 2)

#define IT87_INIT_IN_3 (((500)   * 100)/168)

#define IT87_INIT_IN_4 (((1200)  * 10)/38)

#define IT87_INIT_IN_5 (((1200)  * 10)/72)

#define IT87_INIT_IN_6 (((500)   * 10)/56)

#define IT87_INIT_IN_7 (((500)   * 100)/168)

#define IT87_INIT_IN_PERCENTAGE 10

#define IT87_INIT_IN_MIN_0 \

        (IT87_INIT_IN_0 - IT87_INIT_IN_0 * IT87_INIT_IN_PERCENTAGE / 100)

#define IT87_INIT_IN_MAX_0 \

        (IT87_INIT_IN_0 + IT87_INIT_IN_0 * IT87_INIT_IN_PERCENTAGE / 100)

#define IT87_INIT_IN_MIN_1 \

        (IT87_INIT_IN_1 - IT87_INIT_IN_1 * IT87_INIT_IN_PERCENTAGE / 100)

#define IT87_INIT_IN_MAX_1 \

        (IT87_INIT_IN_1 + IT87_INIT_IN_1 * IT87_INIT_IN_PERCENTAGE / 100)

#define IT87_INIT_IN_MIN_2 \

        (IT87_INIT_IN_2 - IT87_INIT_IN_2 * IT87_INIT_IN_PERCENTAGE / 100)

#define IT87_INIT_IN_MAX_2 \

        (IT87_INIT_IN_2 + IT87_INIT_IN_2 * IT87_INIT_IN_PERCENTAGE / 100)

#define IT87_INIT_IN_MIN_3 \

        (IT87_INIT_IN_3 - IT87_INIT_IN_3 * IT87_INIT_IN_PERCENTAGE / 100)

#define IT87_INIT_IN_MAX_3 \

        (IT87_INIT_IN_3 + IT87_INIT_IN_3 * IT87_INIT_IN_PERCENTAGE / 100)

#define IT87_INIT_IN_MIN_4 \

        (IT87_INIT_IN_4 - IT87_INIT_IN_4 * IT87_INIT_IN_PERCENTAGE / 100)

#define IT87_INIT_IN_MAX_4 \

        (IT87_INIT_IN_4 + IT87_INIT_IN_4 * IT87_INIT_IN_PERCENTAGE / 100)

#define IT87_INIT_IN_MIN_5 \

        (IT87_INIT_IN_5 - IT87_INIT_IN_5 * IT87_INIT_IN_PERCENTAGE / 100)

#define IT87_INIT_IN_MAX_5 \

        (IT87_INIT_IN_5 + IT87_INIT_IN_5 * IT87_INIT_IN_PERCENTAGE / 100)

#define IT87_INIT_IN_MIN_6 \

        (IT87_INIT_IN_6 - IT87_INIT_IN_6 * IT87_INIT_IN_PERCENTAGE / 100)

#define IT87_INIT_IN_MAX_6 \

        (IT87_INIT_IN_6 + IT87_INIT_IN_6 * IT87_INIT_IN_PERCENTAGE / 100)

#define IT87_INIT_IN_MIN_7 \

        (IT87_INIT_IN_7 - IT87_INIT_IN_7 * IT87_INIT_IN_PERCENTAGE / 100)

#define IT87_INIT_IN_MAX_7 \

        (IT87_INIT_IN_7 + IT87_INIT_IN_7 * IT87_INIT_IN_PERCENTAGE / 100)

#define IT87_INIT_FAN_MIN_1 3000

#define IT87_INIT_FAN_MIN_2 3000

#define IT87_INIT_FAN_MIN_3 3000

#define IT87_INIT_TEMP_HIGH_1 600

#define IT87_INIT_TEMP_LOW_1  200

#define IT87_INIT_TEMP_HIGH_2 600

#define IT87_INIT_TEMP_LOW_2  200

#define IT87_INIT_TEMP_HIGH_3 600 

#define IT87_INIT_TEMP_LOW_3  200

/* For each registered IT87, we need to keep some data in memory. That

   data is pointed to by it87_list[NR]->data. The structure itself is

   dynamically allocated, at the same time when a new it87 client is

   allocated. */

struct it87_data {

        struct semaphore lock;

        enum chips type;

        struct semaphore update_lock;

        char valid;             /* !=0 if following fields are valid */

        unsigned long last_updated;     /* In jiffies */

        u8 in[9];               /* Register value */

        u8 in_max[9];           /* Register value */

        u8 in_min[9];           /* Register value */

        u8 fan[3];              /* Register value */

        u8 fan_min[3];          /* Register value */

        u8 temp[3];             /* Register value */

        u8 temp_high[3];        /* Register value */

        u8 temp_low[3];         /* Register value */

        u8 sensor;              /* Register value */

        u8 fan_div[3];          /* Register encoding, shifted right */

        u8 vid;                 /* Register encoding, combined */

        u32 alarms;             /* Register encoding, combined */

};

static int it87_attach_adapter(struct i2c_adapter *adapter);

static int it87_detect(struct i2c_adapter *adapter, int address, int kind);

static int it87_detach_client(struct i2c_client *client);

static int it87_read_value(struct i2c_client *client, u8 register);

static int it87_write_value(struct i2c_client *client, u8 register,

                        u8 value);

static void it87_update_client(struct i2c_client *client);

static void it87_init_client(struct i2c_client *client, struct it87_data *data);

static struct i2c_driver it87_driver = {

        .owner          = THIS_MODULE,

        .name           = "IT87xx",

        .id             = I2C_DRIVERID_IT87,

        .flags          = I2C_DF_NOTIFY,

        .attach_adapter = it87_attach_adapter,

        .detach_client  = it87_detach_client,

};

static int it87_id = 0;

static ssize_t show_in(struct device *dev, char *buf, int nr)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct it87_data *data = i2c_get_clientdata(client);

        it87_update_client(client);

        return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr])*10 );

}

static ssize_t show_in_min(struct device *dev, char *buf, int nr)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct it87_data *data = i2c_get_clientdata(client);

        it87_update_client(client);

        return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr])*10 );

}

static ssize_t show_in_max(struct device *dev, char *buf, int nr)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct it87_data *data = i2c_get_clientdata(client);

        it87_update_client(client);

        return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr])*10 );

}

static ssize_t set_in_min(struct device *dev, const char *buf,

                size_t count, int nr)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct it87_data *data = i2c_get_clientdata(client);

        unsigned long val = simple_strtoul(buf, NULL, 10)/10;

        data->in_min[nr] = IN_TO_REG(val);

        it87_write_value(client, IT87_REG_VIN_MIN(nr),

                        data->in_min[nr]);

        return count;

}

static ssize_t set_in_max(struct device *dev, const char *buf,

                size_t count, int nr)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct it87_data *data = i2c_get_clientdata(client);

        unsigned long val = simple_strtoul(buf, NULL, 10)/10;

        data->in_max[nr] = IN_TO_REG(val);

        it87_write_value(client, IT87_REG_VIN_MAX(nr),

                        data->in_max[nr]);

        return count;

}

#define show_in_offset(offset)                                  \

static ssize_t                                                  \

        show_in##offset (struct device *dev, char *buf)         \

{                                                               \

        return show_in(dev, buf, 0x##offset);                   \

}                                                               \

static DEVICE_ATTR(in_input##offset, S_IRUGO, show_in##offset, NULL)

#define limit_in_offset(offset)                                 \

static ssize_t                                                  \

        show_in##offset##_min (struct device *dev, char *buf)   \

{                                                               \

        return show_in_min(dev, buf, 0x##offset);               \

}                                                               \

static ssize_t                                                  \

        show_in##offset##_max (struct device *dev, char *buf)   \

{                                                               \

        return show_in_max(dev, buf, 0x##offset);               \

}                                                               \

static ssize_t set_in##offset##_min (struct device *dev,        \

                const char *buf, size_t count)                  \

{                                                               \

        return set_in_min(dev, buf, count, 0x##offset);         \

}                                                               \

static ssize_t set_in##offset##_max (struct device *dev,        \

                        const char *buf, size_t count)          \

{                                                               \

        return set_in_max(dev, buf, count, 0x##offset);         \

}                                                               \

static DEVICE_ATTR(in_min##offset, S_IRUGO | S_IWUSR,           \

                show_in##offset##_min, set_in##offset##_min)    \

static DEVICE_ATTR(in_max##offset, S_IRUGO | S_IWUSR,           \

                show_in##offset##_max, set_in##offset##_max)

show_in_offset(0);

limit_in_offset(0);

show_in_offset(1);

limit_in_offset(1);

show_in_offset(2);

limit_in_offset(2);

show_in_offset(3);

limit_in_offset(3);

show_in_offset(4);

limit_in_offset(4);

show_in_offset(5);

limit_in_offset(5);

show_in_offset(6);

limit_in_offset(6);

show_in_offset(7);

limit_in_offset(7);

show_in_offset(8);

/* 3 temperatures */

static ssize_t show_temp(struct device *dev, char *buf, int nr)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct it87_data *data = i2c_get_clientdata(client);

        it87_update_client(client);

        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr])*100 );

}

/* more like overshoot temperature */

static ssize_t show_temp_max(struct device *dev, char *buf, int nr)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct it87_data *data = i2c_get_clientdata(client);

        it87_update_client(client);

        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[nr])*100);

}

/* more like hysteresis temperature */

static ssize_t show_temp_min(struct device *dev, char *buf, int nr)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct it87_data *data = i2c_get_clientdata(client);

        it87_update_client(client);

        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[nr])*100);

}

static ssize_t set_temp_max(struct device *dev, const char *buf,

                size_t count, int nr)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct it87_data *data = i2c_get_clientdata(client);

        int val = simple_strtol(buf, NULL, 10)/100;

        data->temp_high[nr] = TEMP_TO_REG(val);

        it87_write_value(client, IT87_REG_TEMP_HIGH(nr), data->temp_high[nr]);

        return count;

}

static ssize_t set_temp_min(struct device *dev, const char *buf,

                size_t count, int nr)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct it87_data *data = i2c_get_clientdata(client);

        int val = simple_strtol(buf, NULL, 10)/100;

        data->temp_low[nr] = TEMP_TO_REG(val);

        it87_write_value(client, IT87_REG_TEMP_LOW(nr), data->temp_low[nr]);

        return count;

}

#define show_temp_offset(offset)                                        \

static ssize_t show_temp_##offset (struct device *dev, char *buf)       \

{                                                                       \

        return show_temp(dev, buf, 0x##offset - 1);                     \

}                                                                       \

static ssize_t                                                          \

show_temp_##offset##_max (struct device *dev, char *buf)                \

{                                                                       \

        return show_temp_max(dev, buf, 0x##offset - 1);                 \

}                                                                       \

static ssize_t                                                          \

show_temp_##offset##_min (struct device *dev, char *buf)                \

{                                                                       \

        return show_temp_min(dev, buf, 0x##offset - 1);                 \

}                                                                       \

static ssize_t set_temp_##offset##_max (struct device *dev,             \

                const char *buf, size_t count)                          \

{                                                                       \

        return set_temp_max(dev, buf, count, 0x##offset - 1);           \

}                                                                       \

static ssize_t set_temp_##offset##_min (struct device *dev,             \

                const char *buf, size_t count)                          \

{                                                                       \

        return set_temp_min(dev, buf, count, 0x##offset - 1);           \

}                                                                       \

static DEVICE_ATTR(temp_input##offset, S_IRUGO, show_temp_##offset, NULL) \

static DEVICE_ATTR(temp_max##offset, S_IRUGO | S_IWUSR,                 \

                show_temp_##offset##_max, set_temp_##offset##_max)      \

static DEVICE_ATTR(temp_min##offset, S_IRUGO | S_IWUSR,                 \

                show_temp_##offset##_min, set_temp_##offset##_min)      

show_temp_offset(1);

show_temp_offset(2);

show_temp_offset(3);

/* more like overshoot temperature */

static ssize_t show_sensor(struct device *dev, char *buf, int nr)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct it87_data *data = i2c_get_clientdata(client);

        it87_update_client(client);

        if (data->sensor & (1 << nr))

            return sprintf(buf, "1\n");

        if (data->sensor & (8 << nr))

            return sprintf(buf, "2\n");

        return sprintf(buf, "0\n");

}

static ssize_t set_sensor(struct device *dev, const char *buf,

                size_t count, int nr)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct it87_data *data = i2c_get_clientdata(client);

        int val = simple_strtol(buf, NULL, 10);

        data->sensor &= ~(1 << nr);

        data->sensor &= ~(8 << nr);

        if (val == 1)

            data->sensor |= 1 << nr;

        else if (val == 2)

            data->sensor |= 8 << nr;

        it87_write_value(client, IT87_REG_TEMP_ENABLE, data->sensor);

        return count;

}

#define show_sensor_offset(offset)                                      \

static ssize_t show_sensor_##offset (struct device *dev, char *buf)     \

{                                                                       \

        return show_sensor(dev, buf, 0x##offset - 1);                   \

}                                                                       \

static ssize_t set_sensor_##offset (struct device *dev,                 \

                const char *buf, size_t count)                          \

{                                                                       \

        return set_sensor(dev, buf, count, 0x##offset - 1);             \

}                                                                       \

static DEVICE_ATTR(sensor##offset, S_IRUGO | S_IWUSR,                   \

                show_sensor_##offset, set_sensor_##offset)

show_sensor_offset(1);

show_sensor_offset(2);

show_sensor_offset(3);

/* 3 Fans */

static ssize_t show_fan(struct device *dev, char *buf, int nr)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct it87_data *data = i2c_get_clientdata(client);

        it87_update_client(client);

        return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan[nr],

                                DIV_FROM_REG(data->fan_div[nr])) );

}

static ssize_t show_fan_min(struct device *dev, char *buf, int nr)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct it87_data *data = i2c_get_clientdata(client);

        it87_update_client(client);

        return sprintf(buf,"%d\n",

                FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])) );

}

static ssize_t show_fan_div(struct device *dev, char *buf, int nr)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct it87_data *data = i2c_get_clientdata(client);

        it87_update_client(client);

        return sprintf(buf,"%d\n", DIV_FROM_REG(data->fan_div[nr]) );

}

static ssize_t set_fan_min(struct device *dev, const char *buf,

                size_t count, int nr)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct it87_data *data = i2c_get_clientdata(client);

        int val = simple_strtol(buf, NULL, 10);

        data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));

        it87_write_value(client, IT87_REG_FAN_MIN(nr), data->fan_min[nr]);

        return count;

}

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 it87_data *data = i2c_get_clientdata(client);

        int val = simple_strtol(buf, NULL, 10);

        int i, min[3];

        u8 old = it87_read_value(client, IT87_REG_FAN_DIV);

        for (i = 0; i < 3; i++)

                min[i] = FAN_FROM_REG(data->fan_min[i], DIV_FROM_REG(data->fan_div[i]));

        switch (nr) {

        case 0:

        case 1:

                data->fan_div[nr] = DIV_TO_REG(val);

                break;

        case 2:

                if (val < 8)

                        data->fan_div[nr] = 1;

                else

                        data->fan_div[nr] = 3;

        }

        val = old & 0x100;

        val |= (data->fan_div[0] & 0x07);

        val |= (data->fan_div[1] & 0x07) << 3;

        if (data->fan_div[2] == 3)

                val |= 0x1 << 6;

        it87_write_value(client, IT87_REG_FAN_DIV, val);

        for (i = 0; i < 3; i++) {

                data->fan_min[i]=FAN_TO_REG(min[i], DIV_FROM_REG(data->fan_div[i]));

                it87_write_value(client, IT87_REG_FAN_MIN(i), data->fan_min[i]);

        }

        return count;

}

#define show_fan_offset(offset)                                         \

static ssize_t show_fan_##offset (struct device *dev, char *buf)        \

{                                                                       \

        return show_fan(dev, buf, 0x##offset - 1);                      \

}                                                                       \

static ssize_t show_fan_##offset##_min (struct device *dev, char *buf)  \

{                                                                       \

        return show_fan_min(dev, buf, 0x##offset - 1);                  \

}                                                                       \

static ssize_t show_fan_##offset##_div (struct device *dev, char *buf)  \

{                                                                       \

        return show_fan_div(dev, buf, 0x##offset - 1);                  \

}                                                                       \

static ssize_t set_fan_##offset##_min (struct device *dev,              \

        const char *buf, size_t count)                                  \

{                                                                       \

        return set_fan_min(dev, buf, count, 0x##offset - 1);            \

}                                                                       \

static ssize_t set_fan_##offset##_div (struct device *dev,              \

                const char *buf, size_t count)                          \

{                                                                       \

        return set_fan_div(dev, buf, count, 0x##offset - 1);            \

}                                                                       \

static DEVICE_ATTR(fan_input##offset, S_IRUGO, show_fan_##offset, NULL) \

static DEVICE_ATTR(fan_min##offset, S_IRUGO | S_IWUSR,                  \

                show_fan_##offset##_min, set_fan_##offset##_min)        \

static DEVICE_ATTR(fan_div##offset, S_IRUGO | S_IWUSR,                  \

                show_fan_##offset##_div, set_fan_##offset##_div)

show_fan_offset(1);

show_fan_offset(2);

show_fan_offset(3);

/* Alarm */

static ssize_t show_alarm(struct device *dev, char *buf)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct it87_data *data = i2c_get_clientdata(client);

        it87_update_client(client);

        return sprintf(buf,"%d\n", ALARMS_FROM_REG(data->alarms));

}

static DEVICE_ATTR(alarm, S_IRUGO | S_IWUSR, show_alarm, NULL);

/* This function is called when:

     * it87_driver is inserted (when this module is loaded), for each

       available adapter

     * when a new adapter is inserted (and it87_driver is still present) */

static int it87_attach_adapter(struct i2c_adapter *adapter)

{

        if (!(adapter->class & I2C_ADAP_CLASS_SMBUS))

                return 0;

        return i2c_detect(adapter, &addr_data, it87_detect);

}

/* This function is called by i2c_detect */

int it87_detect(struct i2c_adapter *adapter, int address, int kind)

{

        int i;

        struct i2c_client *new_client = NULL;

        struct it87_data *data;

        int err = 0;

        const char *name = "";

        int is_isa = i2c_is_isa_adapter(adapter);

        if (!is_isa &&

            !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))

                goto ERROR0;

        /* Reserve the ISA region */

        if (is_isa)

                if (!request_region(address, IT87_EXTENT, name))

                        goto ERROR0;

        /* Probe whether there is anything available on this address. Already

           done for SMBus clients */

        if (kind < 0) {

                if (is_isa) {

#define REALLY_SLOW_IO

                        /* We need the timeouts for at least some IT87-like chips. But only

                           if we read 'undefined' registers. */

                        i = inb_p(address + 1);

                        if (inb_p(address + 2) != i)

                                goto ERROR1;

                        if (inb_p(address + 3) != i)

                                goto ERROR1;

                        if (inb_p(address + 7) != i)

                                goto ERROR1;

#undef REALLY_SLOW_IO

                        /* Let's just hope nothing breaks here */

                        i = inb_p(address + 5) & 0x7f;

                        outb_p(~i & 0x7f, address + 5);

                        if ((inb_p(address + 5) & 0x7f) != (~i & 0x7f)) {

                                outb_p(i, address + 5);

                                return 0;

                        }

                }

        }

        /* 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 it87_{read,write}_value. */

        if (!(new_client = kmalloc((sizeof(struct i2c_client)) +

                                        sizeof(struct it87_data),

                                        GFP_KERNEL))) {

                err = -ENOMEM;

                goto ERROR1;

        }

        memset(new_client, 0x00, sizeof(struct i2c_client) +

                                 sizeof(struct it87_data));

        data = (struct it87_data *) (new_client + 1);

        if (is_isa)

                init_MUTEX(&data->lock);

        i2c_set_clientdata(new_client, data);

        new_client->addr = address;

        new_client->adapter = adapter;

        new_client->driver = &it87_driver;

        new_client->flags = 0;

        /* Now, we do the remaining detection. */

        if (kind < 0) {

                if (it87_read_value(new_client, IT87_REG_CONFIG) & 0x80)

                        goto ERROR1;

                if (!is_isa

                        && (it87_read_value(new_client, IT87_REG_I2C_ADDR) !=

                        address)) goto ERROR1;

        }

        /* Determine the chip type. */

        if (kind <= 0) {

                i = it87_read_value(new_client, IT87_REG_CHIPID);

                if (i == 0x90) {

                        kind = it87;

                }

                else {

                        if (kind == 0)

                                printk

                                    ("it87.o: Ignoring 'force' parameter for unknown chip at "

                                     "adapter %d, address 0x%02x\n",

                                     i2c_adapter_id(adapter), address);

                        goto ERROR1;

                }

        }

        if (kind == it87) {

                name = "it87";

        } /* else if (kind == it8712) {

                name = "it8712";

        } */ else {

                dev_dbg(&adapter->dev, "Internal error: unknown kind (%d)?!?",

                        kind);

                goto ERROR1;

        }

        /* Fill in the remaining client fields and put it into the global list */

        strlcpy(new_client->name, name, I2C_NAME_SIZE);

        data->type = kind;

        new_client->id = it87_id++;

        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 ERROR1;

        /* Initialize the IT87 chip */

        it87_init_client(new_client, data);

        /* Register sysfs hooks */

        device_create_file(&new_client->dev, &dev_attr_in_input0);

        device_create_file(&new_client->dev, &dev_attr_in_input1);

        device_create_file(&new_client->dev, &dev_attr_in_input2);

        device_create_file(&new_client->dev, &dev_attr_in_input3);

        device_create_file(&new_client->dev, &dev_attr_in_input4);

        device_create_file(&new_client->dev, &dev_attr_in_input5);

        device_create_file(&new_client->dev, &dev_attr_in_input6);

        device_create_file(&new_client->dev, &dev_attr_in_input7);

        device_create_file(&new_client->dev, &dev_attr_in_input8);

        device_create_file(&new_client->dev, &dev_attr_in_min0);

        device_create_file(&new_client->dev, &dev_attr_in_min1);

        device_create_file(&new_client->dev, &dev_attr_in_min2);

        device_create_file(&new_client->dev, &dev_attr_in_min3);

        device_create_file(&new_client->dev, &dev_attr_in_min4);

        device_create_file(&new_client->dev, &dev_attr_in_min5);

        device_create_file(&new_client->dev, &dev_attr_in_min6);

        device_create_file(&new_client->dev, &dev_attr_in_min7);

        device_create_file(&new_client->dev, &dev_attr_in_max0);

        device_create_file(&new_client->dev, &dev_attr_in_max1);

        device_create_file(&new_client->dev, &dev_attr_in_max2);

        device_create_file(&new_client->dev, &dev_attr_in_max3);

        device_create_file(&new_client->dev, &dev_attr_in_max4);

        device_create_file(&new_client->dev, &dev_attr_in_max5);

        device_create_file(&new_client->dev, &dev_attr_in_max6);

        device_create_file(&new_client->dev, &dev_attr_in_max7);

        device_create_file(&new_client->dev, &dev_attr_temp_input1);

        device_create_file(&new_client->dev, &dev_attr_temp_input2);

        device_create_file(&new_client->dev, &dev_attr_temp_input3);

        device_create_file(&new_client->dev, &dev_attr_temp_max1);

        device_create_file(&new_client->dev, &dev_attr_temp_max2);

        device_create_file(&new_client->dev, &dev_attr_temp_max3);

        device_create_file(&new_client->dev, &dev_attr_temp_min1);

        device_create_file(&new_client->dev, &dev_attr_temp_min2);

        device_create_file(&new_client->dev, &dev_attr_temp_min3);

        device_create_file(&new_client->dev, &dev_attr_sensor1);

        device_create_file(&new_client->dev, &dev_attr_sensor2);

        device_create_file(&new_client->dev, &dev_attr_sensor3);

        device_create_file(&new_client->dev, &dev_attr_fan_input1);

        device_create_file(&new_client->dev, &dev_attr_fan_input2);

        device_create_file(&new_client->dev, &dev_attr_fan_input3);

        device_create_file(&new_client->dev, &dev_attr_fan_min1);

        device_create_file(&new_client->dev, &dev_attr_fan_min2);

        device_create_file(&new_client->dev, &dev_attr_fan_min3);

        device_create_file(&new_client->dev, &dev_attr_fan_div1);

        device_create_file(&new_client->dev, &dev_attr_fan_div2);

        device_create_file(&new_client->dev, &dev_attr_fan_div3);

        device_create_file(&new_client->dev, &dev_attr_alarm);

        return 0;

ERROR1:

        kfree(new_client);

        if (is_isa)

                release_region(address, IT87_EXTENT);

ERROR0:

        return err;

}

static int it87_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;

        }