lm85.c

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/*
 * lm85.c - Part of lm_sensors, Linux kernel modules for hardware
 *      monitoring
 * Copyright (c) 1998, 1999  Frodo Looijaard <[email protected]>
 * Copyright (c) 2002, 2003  Philip Pokorny <[email protected]>
 * Copyright (c) 2003        Margit Schubert-While <[email protected]>
 * Copyright (c) 2004        Justin Thiessen <[email protected]>
 * Copyright (C) 2007--2009  Jean Delvare <[email protected]>
 *
 * Chip details at        <http://www.national.com/ds/LM/LM85.pdf>
 *
 * 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-vid.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };

enum chips {
    any_chip, lm85b, lm85c,
    adm1027, adt7463, adt7468,
    emc6d100, emc6d102, emc6d103, emc6d103s
};

/* The LM85 registers */

#define LM85_REG_IN(nr)         (0x20 + (nr))
#define LM85_REG_IN_MIN(nr)     (0x44 + (nr) * 2)
#define LM85_REG_IN_MAX(nr)     (0x45 + (nr) * 2)

#define LM85_REG_TEMP(nr)       (0x25 + (nr))
#define LM85_REG_TEMP_MIN(nr)       (0x4e + (nr) * 2)
#define LM85_REG_TEMP_MAX(nr)       (0x4f + (nr) * 2)

/* Fan speeds are LSB, MSB (2 bytes) */
#define LM85_REG_FAN(nr)        (0x28 + (nr) * 2)
#define LM85_REG_FAN_MIN(nr)        (0x54 + (nr) * 2)

#define LM85_REG_PWM(nr)        (0x30 + (nr))

#define LM85_REG_COMPANY        0x3e
#define LM85_REG_VERSTEP        0x3f

#define ADT7468_REG_CFG5        0x7c
#define ADT7468_OFF64           (1 << 0)
#define ADT7468_HFPWM           (1 << 1)
#define IS_ADT7468_OFF64(data)      \
    ((data)->type == adt7468 && !((data)->cfg5 & ADT7468_OFF64))
#define IS_ADT7468_HFPWM(data)      \
    ((data)->type == adt7468 && !((data)->cfg5 & ADT7468_HFPWM))

/* These are the recognized values for the above regs */
#define LM85_COMPANY_NATIONAL       0x01
#define LM85_COMPANY_ANALOG_DEV     0x41
#define LM85_COMPANY_SMSC       0x5c
#define LM85_VERSTEP_VMASK              0xf0
#define LM85_VERSTEP_GENERIC        0x60
#define LM85_VERSTEP_GENERIC2       0x70
#define LM85_VERSTEP_LM85C      0x60
#define LM85_VERSTEP_LM85B      0x62
#define LM85_VERSTEP_LM96000_1      0x68
#define LM85_VERSTEP_LM96000_2      0x69
#define LM85_VERSTEP_ADM1027        0x60
#define LM85_VERSTEP_ADT7463        0x62
#define LM85_VERSTEP_ADT7463C       0x6A
#define LM85_VERSTEP_ADT7468_1      0x71
#define LM85_VERSTEP_ADT7468_2      0x72
#define LM85_VERSTEP_EMC6D100_A0        0x60
#define LM85_VERSTEP_EMC6D100_A1        0x61
#define LM85_VERSTEP_EMC6D102       0x65
#define LM85_VERSTEP_EMC6D103_A0    0x68
#define LM85_VERSTEP_EMC6D103_A1    0x69
#define LM85_VERSTEP_EMC6D103S      0x6A    /* Also known as EMC6D103:A2 */

#define LM85_REG_CONFIG         0x40

#define LM85_REG_ALARM1         0x41
#define LM85_REG_ALARM2         0x42

#define LM85_REG_VID            0x43

/* Automated FAN control */
#define LM85_REG_AFAN_CONFIG(nr)    (0x5c + (nr))
#define LM85_REG_AFAN_RANGE(nr)     (0x5f + (nr))
#define LM85_REG_AFAN_SPIKE1        0x62
#define LM85_REG_AFAN_MINPWM(nr)    (0x64 + (nr))
#define LM85_REG_AFAN_LIMIT(nr)     (0x67 + (nr))
#define LM85_REG_AFAN_CRITICAL(nr)  (0x6a + (nr))
#define LM85_REG_AFAN_HYST1     0x6d
#define LM85_REG_AFAN_HYST2     0x6e

#define ADM1027_REG_EXTEND_ADC1     0x76
#define ADM1027_REG_EXTEND_ADC2     0x77

#define EMC6D100_REG_ALARM3             0x7d
/* IN5, IN6 and IN7 */
#define EMC6D100_REG_IN(nr)             (0x70 + ((nr) - 5))
#define EMC6D100_REG_IN_MIN(nr)         (0x73 + ((nr) - 5) * 2)
#define EMC6D100_REG_IN_MAX(nr)         (0x74 + ((nr) - 5) * 2)
#define EMC6D102_REG_EXTEND_ADC1    0x85
#define EMC6D102_REG_EXTEND_ADC2    0x86
#define EMC6D102_REG_EXTEND_ADC3    0x87
#define EMC6D102_REG_EXTEND_ADC4    0x88


/*
 * 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.
 */

/* IN are scaled according to built-in resistors */
static const int lm85_scaling[] = {  /* .001 Volts */
    2500, 2250, 3300, 5000, 12000,
    3300, 1500, 1800 /*EMC6D100*/
};
#define SCALE(val, from, to)    (((val) * (to) + ((from) / 2)) / (from))

#define INS_TO_REG(n, val)  \
        SENSORS_LIMIT(SCALE(val, lm85_scaling[n], 192), 0, 255)

#define INSEXT_FROM_REG(n, val, ext)    \
        SCALE(((val) << 4) + (ext), 192 << 4, lm85_scaling[n])

#define INS_FROM_REG(n, val)    SCALE((val), 192, lm85_scaling[n])

/* FAN speed is measured using 90kHz clock */
static inline u16 FAN_TO_REG(unsigned long val)
{
    if (!val)
        return 0xffff;
    return SENSORS_LIMIT(5400000 / val, 1, 0xfffe);
}
#define FAN_FROM_REG(val)   ((val) == 0 ? -1 : (val) == 0xffff ? 0 : \
                 5400000 / (val))

/* Temperature is reported in .001 degC increments */
#define TEMP_TO_REG(val)    \
        SENSORS_LIMIT(SCALE(val, 1000, 1), -127, 127)
#define TEMPEXT_FROM_REG(val, ext)  \
        SCALE(((val) << 4) + (ext), 16, 1000)
#define TEMP_FROM_REG(val)  ((val) * 1000)

#define PWM_TO_REG(val)         SENSORS_LIMIT(val, 0, 255)
#define PWM_FROM_REG(val)       (val)


/*
 * ZONEs have the following parameters:
 *    Limit (low) temp,           1. degC
 *    Hysteresis (below limit),   1. degC (0-15)
 *    Range of speed control,     .1 degC (2-80)
 *    Critical (high) temp,       1. degC
 *
 * FAN PWMs have the following parameters:
 *    Reference Zone,                 1, 2, 3, etc.
 *    Spinup time,                    .05 sec
 *    PWM value at limit/low temp,    1 count
 *    PWM Frequency,                  1. Hz
 *    PWM is Min or OFF below limit,  flag
 *    Invert PWM output,              flag
 *
 * Some chips filter the temp, others the fan.
 *    Filter constant (or disabled)   .1 seconds
 */

/* These are the zone temperature range encodings in .001 degree C */
static const int lm85_range_map[] = {
    2000, 2500, 3300, 4000, 5000, 6600, 8000, 10000,
    13300, 16000, 20000, 26600, 32000, 40000, 53300, 80000
};

static int RANGE_TO_REG(int range)
{
    int i;

    /* Find the closest match */
    for (i = 0; i < 15; ++i) {
        if (range <= (lm85_range_map[i] + lm85_range_map[i + 1]) / 2)
            break;
    }

    return i;
}
#define RANGE_FROM_REG(val) lm85_range_map[(val) & 0x0f]

/* These are the PWM frequency encodings */
static const int lm85_freq_map[8] = { /* 1 Hz */
    10, 15, 23, 30, 38, 47, 61, 94
};
static const int adm1027_freq_map[8] = { /* 1 Hz */
    11, 15, 22, 29, 35, 44, 59, 88
};

static int FREQ_TO_REG(const int *map, int freq)
{
    int i;

    /* Find the closest match */
    for (i = 0; i < 7; ++i)
        if (freq <= (map[i] + map[i + 1]) / 2)
            break;
    return i;
}

static int FREQ_FROM_REG(const int *map, u8 reg)
{
    return map[reg & 0x07];
}

/*
 * Since we can't use strings, I'm abusing these numbers
 *   to stand in for the following meanings:
 *      1 -- PWM responds to Zone 1
 *      2 -- PWM responds to Zone 2
 *      3 -- PWM responds to Zone 3
 *     23 -- PWM responds to the higher temp of Zone 2 or 3
 *    123 -- PWM responds to highest of Zone 1, 2, or 3
 *      0 -- PWM is always at 0% (ie, off)
 *     -1 -- PWM is always at 100%
 *     -2 -- PWM responds to manual control
 */

static const int lm85_zone_map[] = { 1, 2, 3, -1, 0, 23, 123, -2 };
#define ZONE_FROM_REG(val)  lm85_zone_map[(val) >> 5]

static int ZONE_TO_REG(int zone)
{
    int i;

    for (i = 0; i <= 7; ++i)
        if (zone == lm85_zone_map[i])
            break;
    if (i > 7)   /* Not found. */
        i = 3;  /* Always 100% */
    return i << 5;
}

#define HYST_TO_REG(val)    SENSORS_LIMIT(((val) + 500) / 1000, 0, 15)
#define HYST_FROM_REG(val)  ((val) * 1000)

/*
 * Chip sampling rates
 *
 * Some sensors are not updated more frequently than once per second
 *    so it doesn't make sense to read them more often than that.
 *    We cache the results and return the saved data if the driver
 *    is called again before a second has elapsed.
 *
 * Also, there is significant configuration data for this chip
 *    given the automatic PWM fan control that is possible.  There
 *    are about 47 bytes of config data to only 22 bytes of actual
 *    readings.  So, we keep the config data up to date in the cache
 *    when it is written and only sample it once every 1 *minute*
 */
#define LM85_DATA_INTERVAL  (HZ + HZ / 2)
#define LM85_CONFIG_INTERVAL  (1 * 60 * HZ)

/*
 * LM85 can automatically adjust fan speeds based on temperature
 * This structure encapsulates an entire Zone config.  There are
 * three zones (one for each temperature input) on the lm85
 */
struct lm85_zone {
    s8 limit;   /* Low temp limit */
    u8 hyst;    /* Low limit hysteresis. (0-15) */
    u8 range;   /* Temp range, encoded */
    s8 critical;    /* "All fans ON" temp limit */
    u8 max_desired; /*
             * Actual "max" temperature specified.  Preserved
             * to prevent "drift" as other autofan control
             * values change.
             */
};

struct lm85_autofan {
    u8 config;  /* Register value */
    u8 min_pwm; /* Minimum PWM value, encoded */
    u8 min_off; /* Min PWM or OFF below "limit", flag */
};

/*
 * For each registered chip, we need to keep some data in memory.
 * The structure is dynamically allocated.
 */
struct lm85_data {
    struct device *hwmon_dev;
    const int *freq_map;
    enum chips type;

    bool has_vid5;  /* true if VID5 is configured for ADT7463 or ADT7468 */

    struct mutex update_lock;
    int valid;      /* !=0 if following fields are valid */
    unsigned long last_reading; /* In jiffies */
    unsigned long last_config;  /* In jiffies */

    u8 in[8];       /* Register value */
    u8 in_max[8];       /* Register value */
    u8 in_min[8];       /* Register value */
    s8 temp[3];     /* Register value */
    s8 temp_min[3];     /* Register value */
    s8 temp_max[3];     /* Register value */
    u16 fan[4];     /* Register value */
    u16 fan_min[4];     /* Register value */
    u8 pwm[3];      /* Register value */
    u8 pwm_freq[3];     /* Register encoding */
    u8 temp_ext[3];     /* Decoded values */
    u8 in_ext[8];       /* Decoded values */
    u8 vid;         /* Register value */
    u8 vrm;         /* VRM version */
    u32 alarms;     /* Register encoding, combined */
    u8 cfg5;        /* Config Register 5 on ADT7468 */
    struct lm85_autofan autofan[3];
    struct lm85_zone zone[3];
};

static int lm85_detect(struct i2c_client *client, struct i2c_board_info *info);
static int lm85_probe(struct i2c_client *client,
              const struct i2c_device_id *id);
static int lm85_remove(struct i2c_client *client);

static int lm85_read_value(struct i2c_client *client, u8 reg);
static void lm85_write_value(struct i2c_client *client, u8 reg, int value);
static struct lm85_data *lm85_update_device(struct device *dev);


static const struct i2c_device_id lm85_id[] = {
    { "adm1027", adm1027 },
    { "adt7463", adt7463 },
    { "adt7468", adt7468 },
    { "lm85", any_chip },
    { "lm85b", lm85b },
    { "lm85c", lm85c },
    { "emc6d100", emc6d100 },
    { "emc6d101", emc6d100 },
    { "emc6d102", emc6d102 },
    { "emc6d103", emc6d103 },
    { "emc6d103s", emc6d103s },
    { }
};
MODULE_DEVICE_TABLE(i2c, lm85_id);

static struct i2c_driver lm85_driver = {
    .class      = I2C_CLASS_HWMON,
    .driver = {
        .name   = "lm85",
    },
    .probe      = lm85_probe,
    .remove     = lm85_remove,
    .id_table   = lm85_id,
    .detect     = lm85_detect,
    .address_list   = normal_i2c,
};


/* 4 Fans */
static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
        char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr]));
}

static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
        char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[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 lm85_data *data = i2c_get_clientdata(client);
    unsigned long val;
    int err;

    err = kstrtoul(buf, 10, &val);
    if (err)
        return err;

    mutex_lock(&data->update_lock);
    data->fan_min[nr] = FAN_TO_REG(val);
    lm85_write_value(client, LM85_REG_FAN_MIN(nr), data->fan_min[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}

#define show_fan_offset(offset)                     \
static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,         \
        show_fan, NULL, offset - 1);                \
static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,     \
        show_fan_min, set_fan_min, offset - 1)

show_fan_offset(1);
show_fan_offset(2);
show_fan_offset(3);
show_fan_offset(4);

/* vid, vrm, alarms */

static ssize_t show_vid_reg(struct device *dev, struct device_attribute *attr,
        char *buf)
{
    struct lm85_data *data = lm85_update_device(dev);
    int vid;

    if (data->has_vid5) {
        /* 6-pin VID (VRM 10) */
        vid = vid_from_reg(data->vid & 0x3f, data->vrm);
    } else {
        /* 5-pin VID (VRM 9) */
        vid = vid_from_reg(data->vid & 0x1f, data->vrm);
    }

    return sprintf(buf, "%d\n", vid);
}

static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid_reg, NULL);

static ssize_t show_vrm_reg(struct device *dev, struct device_attribute *attr,
        char *buf)
{
    struct lm85_data *data = dev_get_drvdata(dev);
    return sprintf(buf, "%ld\n", (long) data->vrm);
}

static ssize_t store_vrm_reg(struct device *dev, struct device_attribute *attr,
        const char *buf, size_t count)
{
    struct lm85_data *data = dev_get_drvdata(dev);
    unsigned long val;
    int err;

    err = kstrtoul(buf, 10, &val);
    if (err)
        return err;

    data->vrm = val;
    return count;
}

static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);

static ssize_t show_alarms_reg(struct device *dev, struct device_attribute
        *attr, char *buf)
{
    struct lm85_data *data = lm85_update_device(dev);
    return sprintf(buf, "%u\n", data->alarms);
}

static DEVICE_ATTR(alarms, S_IRUGO, show_alarms_reg, NULL);

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
        char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    return sprintf(buf, "%u\n", (data->alarms >> nr) & 1);
}

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, 8);
static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 18);
static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 16);
static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 17);
static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_alarm, NULL, 14);
static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 15);
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(fan3_alarm, S_IRUGO, show_alarm, NULL, 12);
static SENSOR_DEVICE_ATTR(fan4_alarm, S_IRUGO, show_alarm, NULL, 13);

/* pwm */

static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
        char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    return sprintf(buf, "%d\n", PWM_FROM_REG(data->pwm[nr]));
}

static ssize_t set_pwm(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 lm85_data *data = i2c_get_clientdata(client);
    unsigned long val;
    int err;

    err = kstrtoul(buf, 10, &val);
    if (err)
        return err;

    mutex_lock(&data->update_lock);
    data->pwm[nr] = PWM_TO_REG(val);
    lm85_write_value(client, LM85_REG_PWM(nr), data->pwm[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}

static ssize_t show_pwm_enable(struct device *dev, struct device_attribute
        *attr, char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    int pwm_zone, enable;

    pwm_zone = ZONE_FROM_REG(data->autofan[nr].config);
    switch (pwm_zone) {
    case -1:    /* PWM is always at 100% */
        enable = 0;
        break;
    case 0:     /* PWM is always at 0% */
    case -2:    /* PWM responds to manual control */
        enable = 1;
        break;
    default:    /* PWM in automatic mode */
        enable = 2;
    }
    return sprintf(buf, "%d\n", enable);
}

static ssize_t set_pwm_enable(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 lm85_data *data = i2c_get_clientdata(client);
    u8 config;
    unsigned long val;
    int err;

    err = kstrtoul(buf, 10, &val);
    if (err)
        return err;

    switch (val) {
    case 0:
        config = 3;
        break;
    case 1:
        config = 7;
        break;
    case 2:
        /*
         * Here we have to choose arbitrarily one of the 5 possible
         * configurations; I go for the safest
         */
        config = 6;
        break;
    default:
        return -EINVAL;
    }

    mutex_lock(&data->update_lock);
    data->autofan[nr].config = lm85_read_value(client,
        LM85_REG_AFAN_CONFIG(nr));
    data->autofan[nr].config = (data->autofan[nr].config & ~0xe0)
        | (config << 5);
    lm85_write_value(client, LM85_REG_AFAN_CONFIG(nr),
        data->autofan[nr].config);
    mutex_unlock(&data->update_lock);
    return count;
}

static ssize_t show_pwm_freq(struct device *dev,
        struct device_attribute *attr, char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    int freq;

    if (IS_ADT7468_HFPWM(data))
        freq = 22500;
    else
        freq = FREQ_FROM_REG(data->freq_map, data->pwm_freq[nr]);

    return sprintf(buf, "%d\n", freq);
}

static ssize_t set_pwm_freq(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 lm85_data *data = i2c_get_clientdata(client);
    unsigned long val;
    int err;

    err = kstrtoul(buf, 10, &val);
    if (err)
        return err;

    mutex_lock(&data->update_lock);
    /*
     * The ADT7468 has a special high-frequency PWM output mode,
     * where all PWM outputs are driven by a 22.5 kHz clock.
     * This might confuse the user, but there's not much we can do.
     */
    if (data->type == adt7468 && val >= 11300) {    /* High freq. mode */
        data->cfg5 &= ~ADT7468_HFPWM;
        lm85_write_value(client, ADT7468_REG_CFG5, data->cfg5);
    } else {                    /* Low freq. mode */
        data->pwm_freq[nr] = FREQ_TO_REG(data->freq_map, val);
        lm85_write_value(client, LM85_REG_AFAN_RANGE(nr),
                 (data->zone[nr].range << 4)
                 | data->pwm_freq[nr]);
        if (data->type == adt7468) {
            data->cfg5 |= ADT7468_HFPWM;
            lm85_write_value(client, ADT7468_REG_CFG5, data->cfg5);
        }
    }
    mutex_unlock(&data->update_lock);
    return count;
}

#define show_pwm_reg(offset)                        \
static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR,       \
        show_pwm, set_pwm, offset - 1);             \
static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR,  \
        show_pwm_enable, set_pwm_enable, offset - 1);       \
static SENSOR_DEVICE_ATTR(pwm##offset##_freq, S_IRUGO | S_IWUSR,    \
        show_pwm_freq, set_pwm_freq, offset - 1)

show_pwm_reg(1);
show_pwm_reg(2);
show_pwm_reg(3);

/* Voltages */

static ssize_t show_in(struct device *dev, struct device_attribute *attr,
        char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    return sprintf(buf, "%d\n", INSEXT_FROM_REG(nr, data->in[nr],
                            data->in_ext[nr]));
}

static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
        char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    return sprintf(buf, "%d\n", INS_FROM_REG(nr, data->in_min[nr]));
}

static ssize_t set_in_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 lm85_data *data = i2c_get_clientdata(client);
    long val;
    int err;

    err = kstrtol(buf, 10, &val);
    if (err)
        return err;

    mutex_lock(&data->update_lock);
    data->in_min[nr] = INS_TO_REG(nr, val);
    lm85_write_value(client, LM85_REG_IN_MIN(nr), data->in_min[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}

static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
        char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    return sprintf(buf, "%d\n", INS_FROM_REG(nr, data->in_max[nr]));
}

static ssize_t set_in_max(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 lm85_data *data = i2c_get_clientdata(client);
    long val;
    int err;

    err = kstrtol(buf, 10, &val);
    if (err)
        return err;

    mutex_lock(&data->update_lock);
    data->in_max[nr] = INS_TO_REG(nr, val);
    lm85_write_value(client, LM85_REG_IN_MAX(nr), data->in_max[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}

#define show_in_reg(offset)                     \
static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,          \
        show_in, NULL, offset);                 \
static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,      \
        show_in_min, set_in_min, offset);           \
static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,      \
        show_in_max, set_in_max, offset)

show_in_reg(0);
show_in_reg(1);
show_in_reg(2);
show_in_reg(3);
show_in_reg(4);
show_in_reg(5);
show_in_reg(6);
show_in_reg(7);

/* Temps */

static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
        char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    return sprintf(buf, "%d\n", TEMPEXT_FROM_REG(data->temp[nr],
                             data->temp_ext[nr]));
}

static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
        char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[nr]));
}

static ssize_t set_temp_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 lm85_data *data = i2c_get_clientdata(client);
    long val;
    int err;

    err = kstrtol(buf, 10, &val);
    if (err)
        return err;

    if (IS_ADT7468_OFF64(data))
        val += 64;

    mutex_lock(&data->update_lock);
    data->temp_min[nr] = TEMP_TO_REG(val);
    lm85_write_value(client, LM85_REG_TEMP_MIN(nr), data->temp_min[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}

static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
        char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[nr]));
}

static ssize_t set_temp_max(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 lm85_data *data = i2c_get_clientdata(client);
    long val;
    int err;

    err = kstrtol(buf, 10, &val);
    if (err)
        return err;

    if (IS_ADT7468_OFF64(data))
        val += 64;

    mutex_lock(&data->update_lock);
    data->temp_max[nr] = TEMP_TO_REG(val);
    lm85_write_value(client, LM85_REG_TEMP_MAX(nr), data->temp_max[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}

#define show_temp_reg(offset)                       \
static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO,        \
        show_temp, NULL, offset - 1);               \
static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,    \
        show_temp_min, set_temp_min, offset - 1);       \
static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,    \
        show_temp_max, set_temp_max, offset - 1);

show_temp_reg(1);
show_temp_reg(2);
show_temp_reg(3);


/* Automatic PWM control */

static ssize_t show_pwm_auto_channels(struct device *dev,
        struct device_attribute *attr, char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    return sprintf(buf, "%d\n", ZONE_FROM_REG(data->autofan[nr].config));
}

static ssize_t set_pwm_auto_channels(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 lm85_data *data = i2c_get_clientdata(client);
    long val;
    int err;

    err = kstrtol(buf, 10, &val);
    if (err)
        return err;

    mutex_lock(&data->update_lock);
    data->autofan[nr].config = (data->autofan[nr].config & (~0xe0))
        | ZONE_TO_REG(val);
    lm85_write_value(client, LM85_REG_AFAN_CONFIG(nr),
        data->autofan[nr].config);
    mutex_unlock(&data->update_lock);
    return count;
}

static ssize_t show_pwm_auto_pwm_min(struct device *dev,
        struct device_attribute *attr, char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    return sprintf(buf, "%d\n", PWM_FROM_REG(data->autofan[nr].min_pwm));
}

static ssize_t set_pwm_auto_pwm_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 lm85_data *data = i2c_get_clientdata(client);
    unsigned long val;
    int err;

    err = kstrtoul(buf, 10, &val);
    if (err)
        return err;

    mutex_lock(&data->update_lock);
    data->autofan[nr].min_pwm = PWM_TO_REG(val);
    lm85_write_value(client, LM85_REG_AFAN_MINPWM(nr),
        data->autofan[nr].min_pwm);
    mutex_unlock(&data->update_lock);
    return count;
}

static ssize_t show_pwm_auto_pwm_minctl(struct device *dev,
        struct device_attribute *attr, char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    return sprintf(buf, "%d\n", data->autofan[nr].min_off);
}

static ssize_t set_pwm_auto_pwm_minctl(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 lm85_data *data = i2c_get_clientdata(client);
    u8 tmp;
    long val;
    int err;

    err = kstrtol(buf, 10, &val);
    if (err)
        return err;

    mutex_lock(&data->update_lock);
    data->autofan[nr].min_off = val;
    tmp = lm85_read_value(client, LM85_REG_AFAN_SPIKE1);
    tmp &= ~(0x20 << nr);
    if (data->autofan[nr].min_off)
        tmp |= 0x20 << nr;
    lm85_write_value(client, LM85_REG_AFAN_SPIKE1, tmp);
    mutex_unlock(&data->update_lock);
    return count;
}

#define pwm_auto(offset)                        \
static SENSOR_DEVICE_ATTR(pwm##offset##_auto_channels,          \
        S_IRUGO | S_IWUSR, show_pwm_auto_channels,      \
        set_pwm_auto_channels, offset - 1);         \
static SENSOR_DEVICE_ATTR(pwm##offset##_auto_pwm_min,           \
        S_IRUGO | S_IWUSR, show_pwm_auto_pwm_min,       \
        set_pwm_auto_pwm_min, offset - 1);          \
static SENSOR_DEVICE_ATTR(pwm##offset##_auto_pwm_minctl,        \
        S_IRUGO | S_IWUSR, show_pwm_auto_pwm_minctl,        \
        set_pwm_auto_pwm_minctl, offset - 1)

pwm_auto(1);
pwm_auto(2);
pwm_auto(3);

/* Temperature settings for automatic PWM control */

static ssize_t show_temp_auto_temp_off(struct device *dev,
        struct device_attribute *attr, char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->zone[nr].limit) -
        HYST_FROM_REG(data->zone[nr].hyst));
}

static ssize_t set_temp_auto_temp_off(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 lm85_data *data = i2c_get_clientdata(client);
    int min;
    long val;
    int err;

    err = kstrtol(buf, 10, &val);
    if (err)
        return err;

    mutex_lock(&data->update_lock);
    min = TEMP_FROM_REG(data->zone[nr].limit);
    data->zone[nr].hyst = HYST_TO_REG(min - val);
    if (nr == 0 || nr == 1) {
        lm85_write_value(client, LM85_REG_AFAN_HYST1,
            (data->zone[0].hyst << 4)
            | data->zone[1].hyst);
    } else {
        lm85_write_value(client, LM85_REG_AFAN_HYST2,
            (data->zone[2].hyst << 4));
    }
    mutex_unlock(&data->update_lock);
    return count;
}

static ssize_t show_temp_auto_temp_min(struct device *dev,
        struct device_attribute *attr, char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->zone[nr].limit));
}

static ssize_t set_temp_auto_temp_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 lm85_data *data = i2c_get_clientdata(client);
    long val;
    int err;

    err = kstrtol(buf, 10, &val);
    if (err)
        return err;

    mutex_lock(&data->update_lock);
    data->zone[nr].limit = TEMP_TO_REG(val);
    lm85_write_value(client, LM85_REG_AFAN_LIMIT(nr),
        data->zone[nr].limit);

/* Update temp_auto_max and temp_auto_range */
    data->zone[nr].range = RANGE_TO_REG(
        TEMP_FROM_REG(data->zone[nr].max_desired) -
        TEMP_FROM_REG(data->zone[nr].limit));
    lm85_write_value(client, LM85_REG_AFAN_RANGE(nr),
        ((data->zone[nr].range & 0x0f) << 4)
        | (data->pwm_freq[nr] & 0x07));

    mutex_unlock(&data->update_lock);
    return count;
}

static ssize_t show_temp_auto_temp_max(struct device *dev,
        struct device_attribute *attr, char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->zone[nr].limit) +
        RANGE_FROM_REG(data->zone[nr].range));
}

static ssize_t set_temp_auto_temp_max(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 lm85_data *data = i2c_get_clientdata(client);
    int min;
    long val;
    int err;

    err = kstrtol(buf, 10, &val);
    if (err)
        return err;

    mutex_lock(&data->update_lock);
    min = TEMP_FROM_REG(data->zone[nr].limit);
    data->zone[nr].max_desired = TEMP_TO_REG(val);
    data->zone[nr].range = RANGE_TO_REG(
        val - min);
    lm85_write_value(client, LM85_REG_AFAN_RANGE(nr),
        ((data->zone[nr].range & 0x0f) << 4)
        | (data->pwm_freq[nr] & 0x07));
    mutex_unlock(&data->update_lock);
    return count;
}

static ssize_t show_temp_auto_temp_crit(struct device *dev,
        struct device_attribute *attr, char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct lm85_data *data = lm85_update_device(dev);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->zone[nr].critical));
}

static ssize_t set_temp_auto_temp_crit(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 lm85_data *data = i2c_get_clientdata(client);
    long val;
    int err;

    err = kstrtol(buf, 10, &val);
    if (err)
        return err;

    mutex_lock(&data->update_lock);
    data->zone[nr].critical = TEMP_TO_REG(val);
    lm85_write_value(client, LM85_REG_AFAN_CRITICAL(nr),
        data->zone[nr].critical);
    mutex_unlock(&data->update_lock);
    return count;
}

#define temp_auto(offset)                       \
static SENSOR_DEVICE_ATTR(temp##offset##_auto_temp_off,         \
        S_IRUGO | S_IWUSR, show_temp_auto_temp_off,     \
        set_temp_auto_temp_off, offset - 1);            \
static SENSOR_DEVICE_ATTR(temp##offset##_auto_temp_min,         \
        S_IRUGO | S_IWUSR, show_temp_auto_temp_min,     \
        set_temp_auto_temp_min, offset - 1);            \
static SENSOR_DEVICE_ATTR(temp##offset##_auto_temp_max,         \
        S_IRUGO | S_IWUSR, show_temp_auto_temp_max,     \
        set_temp_auto_temp_max, offset - 1);            \
static SENSOR_DEVICE_ATTR(temp##offset##_auto_temp_crit,        \
        S_IRUGO | S_IWUSR, show_temp_auto_temp_crit,        \
        set_temp_auto_temp_crit, offset - 1);

temp_auto(1);
temp_auto(2);
temp_auto(3);

static struct attribute *lm85_attributes[] = {
    &sensor_dev_attr_fan1_input.dev_attr.attr,
    &sensor_dev_attr_fan2_input.dev_attr.attr,
    &sensor_dev_attr_fan3_input.dev_attr.attr,
    &sensor_dev_attr_fan4_input.dev_attr.attr,
    &sensor_dev_attr_fan1_min.dev_attr.attr,
    &sensor_dev_attr_fan2_min.dev_attr.attr,
    &sensor_dev_attr_fan3_min.dev_attr.attr,
    &sensor_dev_attr_fan4_min.dev_attr.attr,
    &sensor_dev_attr_fan1_alarm.dev_attr.attr,
    &sensor_dev_attr_fan2_alarm.dev_attr.attr,
    &sensor_dev_attr_fan3_alarm.dev_attr.attr,
    &sensor_dev_attr_fan4_alarm.dev_attr.attr,

    &sensor_dev_attr_pwm1.dev_attr.attr,
    &sensor_dev_attr_pwm2.dev_attr.attr,
    &sensor_dev_attr_pwm3.dev_attr.attr,
    &sensor_dev_attr_pwm1_enable.dev_attr.attr,
    &sensor_dev_attr_pwm2_enable.dev_attr.attr,
    &sensor_dev_attr_pwm3_enable.dev_attr.attr,
    &sensor_dev_attr_pwm1_freq.dev_attr.attr,
    &sensor_dev_attr_pwm2_freq.dev_attr.attr,
    &sensor_dev_attr_pwm3_freq.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_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_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_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_temp1_input.dev_attr.attr,
    &sensor_dev_attr_temp2_input.dev_attr.attr,
    &sensor_dev_attr_temp3_input.dev_attr.attr,
    &sensor_dev_attr_temp1_min.dev_attr.attr,
    &sensor_dev_attr_temp2_min.dev_attr.attr,
    &sensor_dev_attr_temp3_min.dev_attr.attr,
    &sensor_dev_attr_temp1_max.dev_attr.attr,
    &sensor_dev_attr_temp2_max.dev_attr.attr,
    &sensor_dev_attr_temp3_max.dev_attr.attr,
    &sensor_dev_attr_temp1_alarm.dev_attr.attr,
    &sensor_dev_attr_temp2_alarm.dev_attr.attr,
    &sensor_dev_attr_temp3_alarm.dev_attr.attr,
    &sensor_dev_attr_temp1_fault.dev_attr.attr,
    &sensor_dev_attr_temp3_fault.dev_attr.attr,

    &sensor_dev_attr_pwm1_auto_channels.dev_attr.attr,
    &sensor_dev_attr_pwm2_auto_channels.dev_attr.attr,
    &sensor_dev_attr_pwm3_auto_channels.dev_attr.attr,
    &sensor_dev_attr_pwm1_auto_pwm_min.dev_attr.attr,
    &sensor_dev_attr_pwm2_auto_pwm_min.dev_attr.attr,
    &sensor_dev_attr_pwm3_auto_pwm_min.dev_attr.attr,

    &sensor_dev_attr_temp1_auto_temp_min.dev_attr.attr,
    &sensor_dev_attr_temp2_auto_temp_min.dev_attr.attr,
    &sensor_dev_attr_temp3_auto_temp_min.dev_attr.attr,
    &sensor_dev_attr_temp1_auto_temp_max.dev_attr.attr,
    &sensor_dev_attr_temp2_auto_temp_max.dev_attr.attr,
    &sensor_dev_attr_temp3_auto_temp_max.dev_attr.attr,
    &sensor_dev_attr_temp1_auto_temp_crit.dev_attr.attr,
    &sensor_dev_attr_temp2_auto_temp_crit.dev_attr.attr,
    &sensor_dev_attr_temp3_auto_temp_crit.dev_attr.attr,

    &dev_attr_vrm.attr,
    &dev_attr_cpu0_vid.attr,
    &dev_attr_alarms.attr,
    NULL
};

static const struct attribute_group lm85_group = {
    .attrs = lm85_attributes,
};

static struct attribute *lm85_attributes_minctl[] = {
    &sensor_dev_attr_pwm1_auto_pwm_minctl.dev_attr.attr,
    &sensor_dev_attr_pwm2_auto_pwm_minctl.dev_attr.attr,
    &sensor_dev_attr_pwm3_auto_pwm_minctl.dev_attr.attr,
    NULL
};

static const struct attribute_group lm85_group_minctl = {
    .attrs = lm85_attributes_minctl,
};

static struct attribute *lm85_attributes_temp_off[] = {
    &sensor_dev_attr_temp1_auto_temp_off.dev_attr.attr,
    &sensor_dev_attr_temp2_auto_temp_off.dev_attr.attr,
    &sensor_dev_attr_temp3_auto_temp_off.dev_attr.attr,
    NULL
};

static const struct attribute_group lm85_group_temp_off = {
    .attrs = lm85_attributes_temp_off,
};

static struct attribute *lm85_attributes_in4[] = {
    &sensor_dev_attr_in4_input.dev_attr.attr,
    &sensor_dev_attr_in4_min.dev_attr.attr,
    &sensor_dev_attr_in4_max.dev_attr.attr,
    &sensor_dev_attr_in4_alarm.dev_attr.attr,
    NULL
};

static const struct attribute_group lm85_group_in4 = {
    .attrs = lm85_attributes_in4,
};

static struct attribute *lm85_attributes_in567[] = {
    &sensor_dev_attr_in5_input.dev_attr.attr,
    &sensor_dev_attr_in6_input.dev_attr.attr,
    &sensor_dev_attr_in7_input.dev_attr.attr,
    &sensor_dev_attr_in5_min.dev_attr.attr,
    &sensor_dev_attr_in6_min.dev_attr.attr,
    &sensor_dev_attr_in7_min.dev_attr.attr,
    &sensor_dev_attr_in5_max.dev_attr.attr,
    &sensor_dev_attr_in6_max.dev_attr.attr,
    &sensor_dev_attr_in7_max.dev_attr.attr,
    &sensor_dev_attr_in5_alarm.dev_attr.attr,
    &sensor_dev_attr_in6_alarm.dev_attr.attr,
    &sensor_dev_attr_in7_alarm.dev_attr.attr,
    NULL
};

static const struct attribute_group lm85_group_in567 = {
    .attrs = lm85_attributes_in567,
};

static void lm85_init_client(struct i2c_client *client)
{
    int value;

    /* Start monitoring if needed */
    value = lm85_read_value(client, LM85_REG_CONFIG);
    if (!(value & 0x01)) {
        dev_info(&client->dev, "Starting monitoring\n");
        lm85_write_value(client, LM85_REG_CONFIG, value | 0x01);
    }

    /* Warn about unusual configuration bits */
    if (value & 0x02)
        dev_warn(&client->dev, "Device configuration is locked\n");
    if (!(value & 0x04))
        dev_warn(&client->dev, "Device is not ready\n");
}

static int lm85_is_fake(struct i2c_client *client)
{
    /*
     * Differenciate between real LM96000 and Winbond WPCD377I. The latter
     * emulate the former except that it has no hardware monitoring function
     * so the readings are always 0.
     */
    int i;
    u8 in_temp, fan;

    for (i = 0; i < 8; i++) {
        in_temp = i2c_smbus_read_byte_data(client, 0x20 + i);
        fan = i2c_smbus_read_byte_data(client, 0x28 + i);
        if (in_temp != 0x00 || fan != 0xff)
            return 0;
    }

    return 1;
}

/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm85_detect(struct i2c_client *client, struct i2c_board_info *info)
{
    struct i2c_adapter *adapter = client->adapter;
    int address = client->addr;
    const char *type_name;
    int company, verstep;

    if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
        /* We need to be able to do byte I/O */
        return -ENODEV;
    }

    /* Determine the chip type */
    company = lm85_read_value(client, LM85_REG_COMPANY);
    verstep = lm85_read_value(client, LM85_REG_VERSTEP);

    dev_dbg(&adapter->dev, "Detecting device at 0x%02x with "
        "COMPANY: 0x%02x and VERSTEP: 0x%02x\n",
        address, company, verstep);

    /* All supported chips have the version in common */
    if ((verstep & LM85_VERSTEP_VMASK) != LM85_VERSTEP_GENERIC &&
        (verstep & LM85_VERSTEP_VMASK) != LM85_VERSTEP_GENERIC2) {
        dev_dbg(&adapter->dev,
            "Autodetection failed: unsupported version\n");
        return -ENODEV;
    }
    type_name = "lm85";

    /* Now, refine the detection */
    if (company == LM85_COMPANY_NATIONAL) {
        switch (verstep) {
        case LM85_VERSTEP_LM85C:
            type_name = "lm85c";
            break;
        case LM85_VERSTEP_LM85B:
            type_name = "lm85b";
            break;
        case LM85_VERSTEP_LM96000_1:
        case LM85_VERSTEP_LM96000_2:
            /* Check for Winbond WPCD377I */
            if (lm85_is_fake(client)) {
                dev_dbg(&adapter->dev,
                    "Found Winbond WPCD377I, ignoring\n");
                return -ENODEV;
            }
            break;
        }
    } else if (company == LM85_COMPANY_ANALOG_DEV) {
        switch (verstep) {
        case LM85_VERSTEP_ADM1027:
            type_name = "adm1027";
            break;
        case LM85_VERSTEP_ADT7463:
        case LM85_VERSTEP_ADT7463C:
            type_name = "adt7463";
            break;
        case LM85_VERSTEP_ADT7468_1:
        case LM85_VERSTEP_ADT7468_2:
            type_name = "adt7468";
            break;
        }
    } else if (company == LM85_COMPANY_SMSC) {
        switch (verstep) {
        case LM85_VERSTEP_EMC6D100_A0:
        case LM85_VERSTEP_EMC6D100_A1:
            /* Note: we can't tell a '100 from a '101 */
            type_name = "emc6d100";
            break;
        case LM85_VERSTEP_EMC6D102:
            type_name = "emc6d102";
            break;
        case LM85_VERSTEP_EMC6D103_A0:
        case LM85_VERSTEP_EMC6D103_A1:
            type_name = "emc6d103";
            break;
        case LM85_VERSTEP_EMC6D103S:
            type_name = "emc6d103s";
            break;
        }
    } else {
        dev_dbg(&adapter->dev,
            "Autodetection failed: unknown vendor\n");
        return -ENODEV;
    }

    strlcpy(info->type, type_name, I2C_NAME_SIZE);

    return 0;
}

static void lm85_remove_files(struct i2c_client *client, struct lm85_data *data)
{
    sysfs_remove_group(&client->dev.kobj, &lm85_group);
    if (data->type != emc6d103s) {
        sysfs_remove_group(&client->dev.kobj, &lm85_group_minctl);
        sysfs_remove_group(&client->dev.kobj, &lm85_group_temp_off);
    }
    if (!data->has_vid5)
        sysfs_remove_group(&client->dev.kobj, &lm85_group_in4);
    if (data->type == emc6d100)
        sysfs_remove_group(&client->dev.kobj, &lm85_group_in567);
}

static int lm85_probe(struct i2c_client *client,
              const struct i2c_device_id *id)
{
    struct lm85_data *data;
    int err;

    data = devm_kzalloc(&client->dev, sizeof(struct lm85_data), GFP_KERNEL);
    if (!data)
        return -ENOMEM;

    i2c_set_clientdata(client, data);
    data->type = id->driver_data;
    mutex_init(&data->update_lock);

    /* Fill in the chip specific driver values */
    switch (data->type) {
    case adm1027:
    case adt7463:
    case adt7468:
    case emc6d100:
    case emc6d102:
    case emc6d103:
    case emc6d103s:
        data->freq_map = adm1027_freq_map;
        break;
    default:
        data->freq_map = lm85_freq_map;
    }

    /* Set the VRM version */
    data->vrm = vid_which_vrm();

    /* Initialize the LM85 chip */
    lm85_init_client(client);

    /* Register sysfs hooks */
    err = sysfs_create_group(&client->dev.kobj, &lm85_group);
    if (err)
        return err;

    /* minctl and temp_off exist on all chips except emc6d103s */
    if (data->type != emc6d103s) {
        err = sysfs_create_group(&client->dev.kobj, &lm85_group_minctl);
        if (err)
            goto err_remove_files;
        err = sysfs_create_group(&client->dev.kobj,
                     &lm85_group_temp_off);
        if (err)
            goto err_remove_files;
    }

    /*
     * The ADT7463/68 have an optional VRM 10 mode where pin 21 is used
     * as a sixth digital VID input rather than an analog input.
     */
    if (data->type == adt7463 || data->type == adt7468) {
        u8 vid = lm85_read_value(client, LM85_REG_VID);
        if (vid & 0x80)
            data->has_vid5 = true;
    }

    if (!data->has_vid5) {
        err = sysfs_create_group(&client->dev.kobj, &lm85_group_in4);
        if (err)
            goto err_remove_files;
    }

    /* The EMC6D100 has 3 additional voltage inputs */
    if (data->type == emc6d100) {
        err = sysfs_create_group(&client->dev.kobj, &lm85_group_in567);
        if (err)
            goto err_remove_files;
    }

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

    return 0;

    /* Error out and cleanup code */
 err_remove_files:
    lm85_remove_files(client, data);
    return err;
}

static int lm85_remove(struct i2c_client *client)
{
    struct lm85_data *data = i2c_get_clientdata(client);
    hwmon_device_unregister(data->hwmon_dev);
    lm85_remove_files(client, data);
    return 0;
}


static int lm85_read_value(struct i2c_client *client, u8 reg)
{
    int res;

    /* What size location is it? */
    switch (reg) {
    case LM85_REG_FAN(0):  /* Read WORD data */
    case LM85_REG_FAN(1):
    case LM85_REG_FAN(2):
    case LM85_REG_FAN(3):
    case LM85_REG_FAN_MIN(0):
    case LM85_REG_FAN_MIN(1):
    case LM85_REG_FAN_MIN(2):
    case LM85_REG_FAN_MIN(3):
    case LM85_REG_ALARM1:   /* Read both bytes at once */
        res = i2c_smbus_read_byte_data(client, reg) & 0xff;
        res |= i2c_smbus_read_byte_data(client, reg + 1) << 8;
        break;
    default:    /* Read BYTE data */
        res = i2c_smbus_read_byte_data(client, reg);
        break;
    }

    return res;
}

static void lm85_write_value(struct i2c_client *client, u8 reg, int value)
{
    switch (reg) {
    case LM85_REG_FAN(0):  /* Write WORD data */
    case LM85_REG_FAN(1):
    case LM85_REG_FAN(2):
    case LM85_REG_FAN(3):
    case LM85_REG_FAN_MIN(0):
    case LM85_REG_FAN_MIN(1):
    case LM85_REG_FAN_MIN(2):
    case LM85_REG_FAN_MIN(3):
    /* NOTE: ALARM is read only, so not included here */
        i2c_smbus_write_byte_data(client, reg, value & 0xff);
        i2c_smbus_write_byte_data(client, reg + 1, value >> 8);
        break;
    default:    /* Write BYTE data */
        i2c_smbus_write_byte_data(client, reg, value);
        break;
    }
}

static struct lm85_data *lm85_update_device(struct device *dev)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct lm85_data *data = i2c_get_clientdata(client);
    int i;

    mutex_lock(&data->update_lock);

    if (!data->valid ||
         time_after(jiffies, data->last_reading + LM85_DATA_INTERVAL)) {
        /* Things that change quickly */
        dev_dbg(&client->dev, "Reading sensor values\n");

        /*
         * Have to read extended bits first to "freeze" the
         * more significant bits that are read later.
         * There are 2 additional resolution bits per channel and we
         * have room for 4, so we shift them to the left.
         */
        if (data->type == adm1027 || data->type == adt7463 ||
            data->type == adt7468) {
            int ext1 = lm85_read_value(client,
                           ADM1027_REG_EXTEND_ADC1);
            int ext2 =  lm85_read_value(client,
                            ADM1027_REG_EXTEND_ADC2);
            int val = (ext1 << 8) + ext2;

            for (i = 0; i <= 4; i++)
                data->in_ext[i] =
                    ((val >> (i * 2)) & 0x03) << 2;

            for (i = 0; i <= 2; i++)
                data->temp_ext[i] =
                    (val >> ((i + 4) * 2)) & 0x0c;
        }

        data->vid = lm85_read_value(client, LM85_REG_VID);

        for (i = 0; i <= 3; ++i) {
            data->in[i] =
                lm85_read_value(client, LM85_REG_IN(i));
            data->fan[i] =
                lm85_read_value(client, LM85_REG_FAN(i));
        }

        if (!data->has_vid5)
            data->in[4] = lm85_read_value(client, LM85_REG_IN(4));

        if (data->type == adt7468)
            data->cfg5 = lm85_read_value(client, ADT7468_REG_CFG5);

        for (i = 0; i <= 2; ++i) {
            data->temp[i] =
                lm85_read_value(client, LM85_REG_TEMP(i));
            data->pwm[i] =
                lm85_read_value(client, LM85_REG_PWM(i));

            if (IS_ADT7468_OFF64(data))
                data->temp[i] -= 64;
        }

        data->alarms = lm85_read_value(client, LM85_REG_ALARM1);

        if (data->type == emc6d100) {
            /* Three more voltage sensors */
            for (i = 5; i <= 7; ++i) {
                data->in[i] = lm85_read_value(client,
                            EMC6D100_REG_IN(i));
            }
            /* More alarm bits */
            data->alarms |= lm85_read_value(client,
                        EMC6D100_REG_ALARM3) << 16;
        } else if (data->type == emc6d102 || data->type == emc6d103 ||
               data->type == emc6d103s) {
            /*
             * Have to read LSB bits after the MSB ones because
             * the reading of the MSB bits has frozen the
             * LSBs (backward from the ADM1027).
             */
            int ext1 = lm85_read_value(client,
                           EMC6D102_REG_EXTEND_ADC1);
            int ext2 = lm85_read_value(client,
                           EMC6D102_REG_EXTEND_ADC2);
            int ext3 = lm85_read_value(client,
                           EMC6D102_REG_EXTEND_ADC3);
            int ext4 = lm85_read_value(client,
                           EMC6D102_REG_EXTEND_ADC4);
            data->in_ext[0] = ext3 & 0x0f;
            data->in_ext[1] = ext4 & 0x0f;
            data->in_ext[2] = ext4 >> 4;
            data->in_ext[3] = ext3 >> 4;
            data->in_ext[4] = ext2 >> 4;

            data->temp_ext[0] = ext1 & 0x0f;
            data->temp_ext[1] = ext2 & 0x0f;
            data->temp_ext[2] = ext1 >> 4;
        }

        data->last_reading = jiffies;
    }  /* last_reading */

    if (!data->valid ||
         time_after(jiffies, data->last_config + LM85_CONFIG_INTERVAL)) {
        /* Things that don't change often */
        dev_dbg(&client->dev, "Reading config values\n");

        for (i = 0; i <= 3; ++i) {
            data->in_min[i] =
                lm85_read_value(client, LM85_REG_IN_MIN(i));
            data->in_max[i] =
                lm85_read_value(client, LM85_REG_IN_MAX(i));
            data->fan_min[i] =
                lm85_read_value(client, LM85_REG_FAN_MIN(i));
        }

        if (!data->has_vid5)  {
            data->in_min[4] = lm85_read_value(client,
                      LM85_REG_IN_MIN(4));
            data->in_max[4] = lm85_read_value(client,
                      LM85_REG_IN_MAX(4));
        }

        if (data->type == emc6d100) {
            for (i = 5; i <= 7; ++i) {
                data->in_min[i] = lm85_read_value(client,
                        EMC6D100_REG_IN_MIN(i));
                data->in_max[i] = lm85_read_value(client,
                        EMC6D100_REG_IN_MAX(i));
            }
        }

        for (i = 0; i <= 2; ++i) {
            int val;

            data->temp_min[i] =
                lm85_read_value(client, LM85_REG_TEMP_MIN(i));
            data->temp_max[i] =
                lm85_read_value(client, LM85_REG_TEMP_MAX(i));

            data->autofan[i].config =
                lm85_read_value(client, LM85_REG_AFAN_CONFIG(i));
            val = lm85_read_value(client, LM85_REG_AFAN_RANGE(i));
            data->pwm_freq[i] = val & 0x07;
            data->zone[i].range = val >> 4;
            data->autofan[i].min_pwm =
                lm85_read_value(client, LM85_REG_AFAN_MINPWM(i));
            data->zone[i].limit =
                lm85_read_value(client, LM85_REG_AFAN_LIMIT(i));
            data->zone[i].critical =
                lm85_read_value(client, LM85_REG_AFAN_CRITICAL(i));

            if (IS_ADT7468_OFF64(data)) {
                data->temp_min[i] -= 64;
                data->temp_max[i] -= 64;
                data->zone[i].limit -= 64;
                data->zone[i].critical -= 64;
            }
        }

        if (data->type != emc6d103s) {
            i = lm85_read_value(client, LM85_REG_AFAN_SPIKE1);
            data->autofan[0].min_off = (i & 0x20) != 0;
            data->autofan[1].min_off = (i & 0x40) != 0;
            data->autofan[2].min_off = (i & 0x80) != 0;

            i = lm85_read_value(client, LM85_REG_AFAN_HYST1);
            data->zone[0].hyst = i >> 4;
            data->zone[1].hyst = i & 0x0f;

            i = lm85_read_value(client, LM85_REG_AFAN_HYST2);
            data->zone[2].hyst = i >> 4;
        }

        data->last_config = jiffies;
    }  /* last_config */

    data->valid = 1;

    mutex_unlock(&data->update_lock);

    return data;
}

module_i2c_driver(lm85_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Philip Pokorny <[email protected]>, "
    "Margit Schubert-While <[email protected]>, "
    "Justin Thiessen <[email protected]>");
MODULE_DESCRIPTION("LM85-B, LM85-C driver");