Merge branch 'for-davem' of git://git.kernel.org/pub/scm/linux/kernel/git/linville...

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / hwmon / lm85.c

/*
    lm85.c - Part of lm_sensors, Linux kernel modules for hardware
             monitoring
    Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl>
    Copyright (c) 2002, 2003  Philip Pokorny <ppokorny@penguincomputing.com>
    Copyright (c) 2003        Margit Schubert-While <margitsw@t-online.de>
    Copyright (c) 2004        Justin Thiessen <jthiessen@penguincomputing.com>
    Copyright (C) 2007--2009  Jean Delvare <khali@linux-fr.org>

    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 = simple_strtoul(buf, NULL, 10);

        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);
        data->vrm = simple_strtoul(buf, NULL, 10);
        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);
        long val = simple_strtol(buf, NULL, 10);

        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);
        long val = simple_strtol(buf, NULL, 10);
        u8 config;

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

        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 = simple_strtol(buf, NULL, 10);

        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 = simple_strtol(buf, NULL, 10);

        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 = simple_strtol(buf, NULL, 10);

        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 = simple_strtol(buf, NULL, 10);

        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 = simple_strtol(buf, NULL, 10);

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

        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);
        long val = simple_strtol(buf, NULL, 10);
        u8 tmp;

        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 = simple_strtol(buf, NULL, 10);

        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 = simple_strtol(buf, NULL, 10);

        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 = simple_strtol(buf, NULL, 10);

        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 = simple_strtol(buf, NULL, 10);

        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 = kzalloc(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)
                goto err_kfree;

        /* 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)
                if ((err = sysfs_create_group(&client->dev.kobj,
                                        &lm85_group_in4)))
                        goto err_remove_files;

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


static int __init sm_lm85_init(void)
{
        return i2c_add_driver(&lm85_driver);
}

static void __exit sm_lm85_exit(void)
{
        i2c_del_driver(&lm85_driver);
}

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Philip Pokorny <ppokorny@penguincomputing.com>, "
        "Margit Schubert-While <margitsw@t-online.de>, "
        "Justin Thiessen <jthiessen@penguincomputing.com>");
MODULE_DESCRIPTION("LM85-B, LM85-C driver");

module_init(sm_lm85_init);
module_exit(sm_lm85_exit);