f75375s.c

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/*
 * f75375s.c - driver for the Fintek F75375/SP, F75373 and
 *             F75387SG/RG hardware monitoring features
 * Copyright (C) 2006-2007  Riku Voipio
 *
 * Datasheets available at:
 *
 * f75375:
 * http://www.fintek.com.tw/files/productfiles/F75375_V026P.pdf
 *
 * f75373:
 * http://www.fintek.com.tw/files/productfiles/F75373_V025P.pdf
 *
 * f75387:
 * http://www.fintek.com.tw/files/productfiles/F75387_V027P.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/jiffies.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/f75375s.h>
#include <linux/slab.h>

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

enum chips { f75373, f75375, f75387 };

/* Fintek F75375 registers  */
#define F75375_REG_CONFIG0      0x0
#define F75375_REG_CONFIG1      0x1
#define F75375_REG_CONFIG2      0x2
#define F75375_REG_CONFIG3      0x3
#define F75375_REG_ADDR         0x4
#define F75375_REG_INTR         0x31
#define F75375_CHIP_ID          0x5A
#define F75375_REG_VERSION      0x5C
#define F75375_REG_VENDOR       0x5D
#define F75375_REG_FAN_TIMER        0x60

#define F75375_REG_VOLT(nr)     (0x10 + (nr))
#define F75375_REG_VOLT_HIGH(nr)    (0x20 + (nr) * 2)
#define F75375_REG_VOLT_LOW(nr)     (0x21 + (nr) * 2)

#define F75375_REG_TEMP(nr)     (0x14 + (nr))
#define F75387_REG_TEMP11_LSB(nr)   (0x1a + (nr))
#define F75375_REG_TEMP_HIGH(nr)    (0x28 + (nr) * 2)
#define F75375_REG_TEMP_HYST(nr)    (0x29 + (nr) * 2)

#define F75375_REG_FAN(nr)      (0x16 + (nr) * 2)
#define F75375_REG_FAN_MIN(nr)      (0x2C + (nr) * 2)
#define F75375_REG_FAN_FULL(nr)     (0x70 + (nr) * 0x10)
#define F75375_REG_FAN_PWM_DUTY(nr) (0x76 + (nr) * 0x10)
#define F75375_REG_FAN_PWM_CLOCK(nr)    (0x7D + (nr) * 0x10)

#define F75375_REG_FAN_EXP(nr)      (0x74 + (nr) * 0x10)
#define F75375_REG_FAN_B_TEMP(nr, step) ((0xA0 + (nr) * 0x10) + (step))
#define F75375_REG_FAN_B_SPEED(nr, step) \
    ((0xA5 + (nr) * 0x10) + (step) * 2)

#define F75375_REG_PWM1_RAISE_DUTY  0x69
#define F75375_REG_PWM2_RAISE_DUTY  0x6A
#define F75375_REG_PWM1_DROP_DUTY   0x6B
#define F75375_REG_PWM2_DROP_DUTY   0x6C

#define F75375_FAN_CTRL_LINEAR(nr)  (4 + nr)
#define F75387_FAN_CTRL_LINEAR(nr)  (1 + ((nr) * 4))
#define FAN_CTRL_MODE(nr)       (4 + ((nr) * 2))
#define F75387_FAN_DUTY_MODE(nr)    (2 + ((nr) * 4))
#define F75387_FAN_MANU_MODE(nr)    ((nr) * 4)

/*
 * Data structures and manipulation thereof
 */

struct f75375_data {
    unsigned short addr;
    struct device *hwmon_dev;

    const char *name;
    int kind;
    struct mutex update_lock; /* protect register access */
    char valid;
    unsigned long last_updated; /* In jiffies */
    unsigned long last_limits;  /* In jiffies */

    /* Register values */
    u8 in[4];
    u8 in_max[4];
    u8 in_min[4];
    u16 fan[2];
    u16 fan_min[2];
    u16 fan_max[2];
    u16 fan_target[2];
    u8 fan_timer;
    u8 pwm[2];
    u8 pwm_mode[2];
    u8 pwm_enable[2];
    /*
     * f75387: For remote temperature reading, it uses signed 11-bit
     * values with LSB = 0.125 degree Celsius, left-justified in 16-bit
     * registers. For original 8-bit temp readings, the LSB just is 0.
     */
    s16 temp11[2];
    s8 temp_high[2];
    s8 temp_max_hyst[2];
};

static int f75375_detect(struct i2c_client *client,
             struct i2c_board_info *info);
static int f75375_probe(struct i2c_client *client,
            const struct i2c_device_id *id);
static int f75375_remove(struct i2c_client *client);

static const struct i2c_device_id f75375_id[] = {
    { "f75373", f75373 },
    { "f75375", f75375 },
    { "f75387", f75387 },
    { }
};
MODULE_DEVICE_TABLE(i2c, f75375_id);

static struct i2c_driver f75375_driver = {
    .class = I2C_CLASS_HWMON,
    .driver = {
        .name = "f75375",
    },
    .probe = f75375_probe,
    .remove = f75375_remove,
    .id_table = f75375_id,
    .detect = f75375_detect,
    .address_list = normal_i2c,
};

static inline int f75375_read8(struct i2c_client *client, u8 reg)
{
    return i2c_smbus_read_byte_data(client, reg);
}

/* in most cases, should be called while holding update_lock */
static inline u16 f75375_read16(struct i2c_client *client, u8 reg)
{
    return (i2c_smbus_read_byte_data(client, reg) << 8)
        | i2c_smbus_read_byte_data(client, reg + 1);
}

static inline void f75375_write8(struct i2c_client *client, u8 reg,
        u8 value)
{
    i2c_smbus_write_byte_data(client, reg, value);
}

static inline void f75375_write16(struct i2c_client *client, u8 reg,
        u16 value)
{
    int err = i2c_smbus_write_byte_data(client, reg, (value >> 8));
    if (err)
        return;
    i2c_smbus_write_byte_data(client, reg + 1, (value & 0xFF));
}

static void f75375_write_pwm(struct i2c_client *client, int nr)
{
    struct f75375_data *data = i2c_get_clientdata(client);
    if (data->kind == f75387)
        f75375_write16(client, F75375_REG_FAN_EXP(nr), data->pwm[nr]);
    else
        f75375_write8(client, F75375_REG_FAN_PWM_DUTY(nr),
                  data->pwm[nr]);
}

static struct f75375_data *f75375_update_device(struct device *dev)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct f75375_data *data = i2c_get_clientdata(client);
    int nr;

    mutex_lock(&data->update_lock);

    /* Limit registers cache is refreshed after 60 seconds */
    if (time_after(jiffies, data->last_limits + 60 * HZ)
        || !data->valid) {
        for (nr = 0; nr < 2; nr++) {
            data->temp_high[nr] =
                f75375_read8(client, F75375_REG_TEMP_HIGH(nr));
            data->temp_max_hyst[nr] =
                f75375_read8(client, F75375_REG_TEMP_HYST(nr));
            data->fan_max[nr] =
                f75375_read16(client, F75375_REG_FAN_FULL(nr));
            data->fan_min[nr] =
                f75375_read16(client, F75375_REG_FAN_MIN(nr));
            data->fan_target[nr] =
                f75375_read16(client, F75375_REG_FAN_EXP(nr));
        }
        for (nr = 0; nr < 4; nr++) {
            data->in_max[nr] =
                f75375_read8(client, F75375_REG_VOLT_HIGH(nr));
            data->in_min[nr] =
                f75375_read8(client, F75375_REG_VOLT_LOW(nr));
        }
        data->fan_timer = f75375_read8(client, F75375_REG_FAN_TIMER);
        data->last_limits = jiffies;
    }

    /* Measurement registers cache is refreshed after 2 second */
    if (time_after(jiffies, data->last_updated + 2 * HZ)
        || !data->valid) {
        for (nr = 0; nr < 2; nr++) {
            data->pwm[nr] = f75375_read8(client,
                F75375_REG_FAN_PWM_DUTY(nr));
            /* assign MSB, therefore shift it by 8 bits */
            data->temp11[nr] =
                f75375_read8(client, F75375_REG_TEMP(nr)) << 8;
            if (data->kind == f75387)
                /* merge F75387's temperature LSB (11-bit) */
                data->temp11[nr] |=
                    f75375_read8(client,
                             F75387_REG_TEMP11_LSB(nr));
            data->fan[nr] =
                f75375_read16(client, F75375_REG_FAN(nr));
        }
        for (nr = 0; nr < 4; nr++)
            data->in[nr] =
                f75375_read8(client, F75375_REG_VOLT(nr));

        data->last_updated = jiffies;
        data->valid = 1;
    }

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

static inline u16 rpm_from_reg(u16 reg)
{
    if (reg == 0 || reg == 0xffff)
        return 0;
    return 1500000 / reg;
}

static inline u16 rpm_to_reg(int rpm)
{
    if (rpm < 367 || rpm > 0xffff)
        return 0xffff;
    return 1500000 / rpm;
}

static bool duty_mode_enabled(u8 pwm_enable)
{
    switch (pwm_enable) {
    case 0: /* Manual, duty mode (full speed) */
    case 1: /* Manual, duty mode */
    case 4: /* Auto, duty mode */
        return true;
    case 2: /* Auto, speed mode */
    case 3: /* Manual, speed mode */
        return false;
    default:
        BUG();
        return true;
    }
}

static bool auto_mode_enabled(u8 pwm_enable)
{
    switch (pwm_enable) {
    case 0: /* Manual, duty mode (full speed) */
    case 1: /* Manual, duty mode */
    case 3: /* Manual, speed mode */
        return false;
    case 2: /* Auto, speed mode */
    case 4: /* Auto, duty mode */
        return true;
    default:
        BUG();
        return false;
    }
}

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 f75375_data *data = i2c_get_clientdata(client);
    unsigned long val;
    int err;

    err = kstrtoul(buf, 10, &val);
    if (err < 0)
        return err;

    mutex_lock(&data->update_lock);
    data->fan_min[nr] = rpm_to_reg(val);
    f75375_write16(client, F75375_REG_FAN_MIN(nr), data->fan_min[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}

static ssize_t set_fan_target(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 f75375_data *data = i2c_get_clientdata(client);
    unsigned long val;
    int err;

    err = kstrtoul(buf, 10, &val);
    if (err < 0)
        return err;

    if (auto_mode_enabled(data->pwm_enable[nr]))
        return -EINVAL;
    if (data->kind == f75387 && duty_mode_enabled(data->pwm_enable[nr]))
        return -EINVAL;

    mutex_lock(&data->update_lock);
    data->fan_target[nr] = rpm_to_reg(val);
    f75375_write16(client, F75375_REG_FAN_EXP(nr), data->fan_target[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}

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 f75375_data *data = i2c_get_clientdata(client);
    unsigned long val;
    int err;

    err = kstrtoul(buf, 10, &val);
    if (err < 0)
        return err;

    if (auto_mode_enabled(data->pwm_enable[nr]) ||
        !duty_mode_enabled(data->pwm_enable[nr]))
        return -EINVAL;

    mutex_lock(&data->update_lock);
    data->pwm[nr] = SENSORS_LIMIT(val, 0, 255);
    f75375_write_pwm(client, 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 f75375_data *data = f75375_update_device(dev);
    return sprintf(buf, "%d\n", data->pwm_enable[nr]);
}

static int set_pwm_enable_direct(struct i2c_client *client, int nr, int val)
{
    struct f75375_data *data = i2c_get_clientdata(client);
    u8 fanmode;

    if (val < 0 || val > 4)
        return -EINVAL;

    fanmode = f75375_read8(client, F75375_REG_FAN_TIMER);
    if (data->kind == f75387) {
        /* For now, deny dangerous toggling of duty mode */
        if (duty_mode_enabled(data->pwm_enable[nr]) !=
                duty_mode_enabled(val))
            return -EOPNOTSUPP;
        /* clear each fanX_mode bit before setting them properly */
        fanmode &= ~(1 << F75387_FAN_DUTY_MODE(nr));
        fanmode &= ~(1 << F75387_FAN_MANU_MODE(nr));
        switch (val) {
        case 0: /* full speed */
            fanmode |= (1 << F75387_FAN_MANU_MODE(nr));
            fanmode |= (1 << F75387_FAN_DUTY_MODE(nr));
            data->pwm[nr] = 255;
            break;
        case 1: /* PWM */
            fanmode  |= (1 << F75387_FAN_MANU_MODE(nr));
            fanmode  |= (1 << F75387_FAN_DUTY_MODE(nr));
            break;
        case 2: /* Automatic, speed mode */
            break;
        case 3: /* fan speed */
            fanmode |= (1 << F75387_FAN_MANU_MODE(nr));
            break;
        case 4: /* Automatic, pwm */
            fanmode |= (1 << F75387_FAN_DUTY_MODE(nr));
            break;
        }
    } else {
        /* clear each fanX_mode bit before setting them properly */
        fanmode &= ~(3 << FAN_CTRL_MODE(nr));
        switch (val) {
        case 0: /* full speed */
            fanmode  |= (3 << FAN_CTRL_MODE(nr));
            data->pwm[nr] = 255;
            break;
        case 1: /* PWM */
            fanmode  |= (3 << FAN_CTRL_MODE(nr));
            break;
        case 2: /* AUTOMATIC*/
            fanmode  |= (1 << FAN_CTRL_MODE(nr));
            break;
        case 3: /* fan speed */
            break;
        case 4: /* Automatic pwm */
            return -EINVAL;
        }
    }

    f75375_write8(client, F75375_REG_FAN_TIMER, fanmode);
    data->pwm_enable[nr] = val;
    if (val == 0)
        f75375_write_pwm(client, nr);
    return 0;
}

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 f75375_data *data = i2c_get_clientdata(client);
    unsigned long val;
    int err;

    err = kstrtoul(buf, 10, &val);
    if (err < 0)
        return err;

    mutex_lock(&data->update_lock);
    err = set_pwm_enable_direct(client, nr, val);
    mutex_unlock(&data->update_lock);
    return err ? err : count;
}

static ssize_t set_pwm_mode(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 f75375_data *data = i2c_get_clientdata(client);
    unsigned long val;
    int err;
    u8 conf;
    char reg, ctrl;

    err = kstrtoul(buf, 10, &val);
    if (err < 0)
        return err;

    if (!(val == 0 || val == 1))
        return -EINVAL;

    /* F75373 does not support DC (linear voltage) fan control mode */
    if (data->kind == f75373 && val == 0)
        return -EINVAL;

    /* take care for different registers */
    if (data->kind == f75387) {
        reg = F75375_REG_FAN_TIMER;
        ctrl = F75387_FAN_CTRL_LINEAR(nr);
    } else {
        reg = F75375_REG_CONFIG1;
        ctrl = F75375_FAN_CTRL_LINEAR(nr);
    }

    mutex_lock(&data->update_lock);
    conf = f75375_read8(client, reg);
    conf &= ~(1 << ctrl);

    if (val == 0)
        conf |= (1 << ctrl);

    f75375_write8(client, reg, conf);
    data->pwm_mode[nr] = val;
    mutex_unlock(&data->update_lock);
    return count;
}

static ssize_t show_pwm(struct device *dev, struct device_attribute
        *attr, char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct f75375_data *data = f75375_update_device(dev);
    return sprintf(buf, "%d\n", data->pwm[nr]);
}

static ssize_t show_pwm_mode(struct device *dev, struct device_attribute
        *attr, char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct f75375_data *data = f75375_update_device(dev);
    return sprintf(buf, "%d\n", data->pwm_mode[nr]);
}

#define VOLT_FROM_REG(val) ((val) * 8)
#define VOLT_TO_REG(val) ((val) / 8)

static ssize_t show_in(struct device *dev, struct device_attribute *attr,
        char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct f75375_data *data = f75375_update_device(dev);
    return sprintf(buf, "%d\n", VOLT_FROM_REG(data->in[nr]));
}

static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
        char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct f75375_data *data = f75375_update_device(dev);
    return sprintf(buf, "%d\n", VOLT_FROM_REG(data->in_max[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 f75375_data *data = f75375_update_device(dev);
    return sprintf(buf, "%d\n", VOLT_FROM_REG(data->in_min[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 f75375_data *data = i2c_get_clientdata(client);
    unsigned long val;
    int err;

    err = kstrtoul(buf, 10, &val);
    if (err < 0)
        return err;

    val = SENSORS_LIMIT(VOLT_TO_REG(val), 0, 0xff);
    mutex_lock(&data->update_lock);
    data->in_max[nr] = val;
    f75375_write8(client, F75375_REG_VOLT_HIGH(nr), data->in_max[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}

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 f75375_data *data = i2c_get_clientdata(client);
    unsigned long val;
    int err;

    err = kstrtoul(buf, 10, &val);
    if (err < 0)
        return err;

    val = SENSORS_LIMIT(VOLT_TO_REG(val), 0, 0xff);
    mutex_lock(&data->update_lock);
    data->in_min[nr] = val;
    f75375_write8(client, F75375_REG_VOLT_LOW(nr), data->in_min[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}
#define TEMP_FROM_REG(val) ((val) * 1000)
#define TEMP_TO_REG(val) ((val) / 1000)
#define TEMP11_FROM_REG(reg)    ((reg) / 32 * 125)

static ssize_t show_temp11(struct device *dev, struct device_attribute *attr,
        char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct f75375_data *data = f75375_update_device(dev);
    return sprintf(buf, "%d\n", TEMP11_FROM_REG(data->temp11[nr]));
}

static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
        char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct f75375_data *data = f75375_update_device(dev);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[nr]));
}

static ssize_t show_temp_max_hyst(struct device *dev,
        struct device_attribute *attr, char *buf)
{
    int nr = to_sensor_dev_attr(attr)->index;
    struct f75375_data *data = f75375_update_device(dev);
    return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max_hyst[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 f75375_data *data = i2c_get_clientdata(client);
    unsigned long val;
    int err;

    err = kstrtoul(buf, 10, &val);
    if (err < 0)
        return err;

    val = SENSORS_LIMIT(TEMP_TO_REG(val), 0, 127);
    mutex_lock(&data->update_lock);
    data->temp_high[nr] = val;
    f75375_write8(client, F75375_REG_TEMP_HIGH(nr), data->temp_high[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}

static ssize_t set_temp_max_hyst(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 f75375_data *data = i2c_get_clientdata(client);
    unsigned long val;
    int err;

    err = kstrtoul(buf, 10, &val);
    if (err < 0)
        return err;

    val = SENSORS_LIMIT(TEMP_TO_REG(val), 0, 127);
    mutex_lock(&data->update_lock);
    data->temp_max_hyst[nr] = val;
    f75375_write8(client, F75375_REG_TEMP_HYST(nr),
        data->temp_max_hyst[nr]);
    mutex_unlock(&data->update_lock);
    return count;
}

#define show_fan(thing) \
static ssize_t show_##thing(struct device *dev, struct device_attribute *attr, \
            char *buf)\
{\
    int nr = to_sensor_dev_attr(attr)->index;\
    struct f75375_data *data = f75375_update_device(dev); \
    return sprintf(buf, "%d\n", rpm_from_reg(data->thing[nr])); \
}

show_fan(fan);
show_fan(fan_min);
show_fan(fan_max);
show_fan(fan_target);

static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in, NULL, 0);
static SENSOR_DEVICE_ATTR(in0_max, S_IRUGO|S_IWUSR,
    show_in_max, set_in_max, 0);
static SENSOR_DEVICE_ATTR(in0_min, S_IRUGO|S_IWUSR,
    show_in_min, set_in_min, 0);
static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in, NULL, 1);
static SENSOR_DEVICE_ATTR(in1_max, S_IRUGO|S_IWUSR,
    show_in_max, set_in_max, 1);
static SENSOR_DEVICE_ATTR(in1_min, S_IRUGO|S_IWUSR,
    show_in_min, set_in_min, 1);
static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in, NULL, 2);
static SENSOR_DEVICE_ATTR(in2_max, S_IRUGO|S_IWUSR,
    show_in_max, set_in_max, 2);
static SENSOR_DEVICE_ATTR(in2_min, S_IRUGO|S_IWUSR,
    show_in_min, set_in_min, 2);
static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in, NULL, 3);
static SENSOR_DEVICE_ATTR(in3_max, S_IRUGO|S_IWUSR,
    show_in_max, set_in_max, 3);
static SENSOR_DEVICE_ATTR(in3_min, S_IRUGO|S_IWUSR,
    show_in_min, set_in_min, 3);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp11, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IRUGO|S_IWUSR,
    show_temp_max_hyst, set_temp_max_hyst, 0);
static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO|S_IWUSR,
    show_temp_max, set_temp_max, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IRUGO|S_IWUSR,
    show_temp_max_hyst, set_temp_max_hyst, 1);
static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO|S_IWUSR,
    show_temp_max, set_temp_max, 1);
static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
static SENSOR_DEVICE_ATTR(fan1_max, S_IRUGO, show_fan_max, NULL, 0);
static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO|S_IWUSR,
    show_fan_min, set_fan_min, 0);
static SENSOR_DEVICE_ATTR(fan1_target, S_IRUGO|S_IWUSR,
    show_fan_target, set_fan_target, 0);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
static SENSOR_DEVICE_ATTR(fan2_max, S_IRUGO, show_fan_max, NULL, 1);
static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO|S_IWUSR,
    show_fan_min, set_fan_min, 1);
static SENSOR_DEVICE_ATTR(fan2_target, S_IRUGO|S_IWUSR,
    show_fan_target, set_fan_target, 1);
static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO|S_IWUSR,
    show_pwm, set_pwm, 0);
static SENSOR_DEVICE_ATTR(pwm1_enable, S_IRUGO|S_IWUSR,
    show_pwm_enable, set_pwm_enable, 0);
static SENSOR_DEVICE_ATTR(pwm1_mode, S_IRUGO,
    show_pwm_mode, set_pwm_mode, 0);
static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR,
    show_pwm, set_pwm, 1);
static SENSOR_DEVICE_ATTR(pwm2_enable, S_IRUGO|S_IWUSR,
    show_pwm_enable, set_pwm_enable, 1);
static SENSOR_DEVICE_ATTR(pwm2_mode, S_IRUGO,
    show_pwm_mode, set_pwm_mode, 1);

static struct attribute *f75375_attributes[] = {
    &sensor_dev_attr_temp1_input.dev_attr.attr,
    &sensor_dev_attr_temp1_max.dev_attr.attr,
    &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
    &sensor_dev_attr_temp2_input.dev_attr.attr,
    &sensor_dev_attr_temp2_max.dev_attr.attr,
    &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
    &sensor_dev_attr_fan1_input.dev_attr.attr,
    &sensor_dev_attr_fan1_max.dev_attr.attr,
    &sensor_dev_attr_fan1_min.dev_attr.attr,
    &sensor_dev_attr_fan1_target.dev_attr.attr,
    &sensor_dev_attr_fan2_input.dev_attr.attr,
    &sensor_dev_attr_fan2_max.dev_attr.attr,
    &sensor_dev_attr_fan2_min.dev_attr.attr,
    &sensor_dev_attr_fan2_target.dev_attr.attr,
    &sensor_dev_attr_pwm1.dev_attr.attr,
    &sensor_dev_attr_pwm1_enable.dev_attr.attr,
    &sensor_dev_attr_pwm1_mode.dev_attr.attr,
    &sensor_dev_attr_pwm2.dev_attr.attr,
    &sensor_dev_attr_pwm2_enable.dev_attr.attr,
    &sensor_dev_attr_pwm2_mode.dev_attr.attr,
    &sensor_dev_attr_in0_input.dev_attr.attr,
    &sensor_dev_attr_in0_max.dev_attr.attr,
    &sensor_dev_attr_in0_min.dev_attr.attr,
    &sensor_dev_attr_in1_input.dev_attr.attr,
    &sensor_dev_attr_in1_max.dev_attr.attr,
    &sensor_dev_attr_in1_min.dev_attr.attr,
    &sensor_dev_attr_in2_input.dev_attr.attr,
    &sensor_dev_attr_in2_max.dev_attr.attr,
    &sensor_dev_attr_in2_min.dev_attr.attr,
    &sensor_dev_attr_in3_input.dev_attr.attr,
    &sensor_dev_attr_in3_max.dev_attr.attr,
    &sensor_dev_attr_in3_min.dev_attr.attr,
    NULL
};

static const struct attribute_group f75375_group = {
    .attrs = f75375_attributes,
};

static void f75375_init(struct i2c_client *client, struct f75375_data *data,
        struct f75375s_platform_data *f75375s_pdata)
{
    int nr;

    if (!f75375s_pdata) {
        u8 conf, mode;
        int nr;

        conf = f75375_read8(client, F75375_REG_CONFIG1);
        mode = f75375_read8(client, F75375_REG_FAN_TIMER);
        for (nr = 0; nr < 2; nr++) {
            if (data->kind == f75387) {
                bool manu, duty;

                if (!(mode & (1 << F75387_FAN_CTRL_LINEAR(nr))))
                    data->pwm_mode[nr] = 1;

                manu = ((mode >> F75387_FAN_MANU_MODE(nr)) & 1);
                duty = ((mode >> F75387_FAN_DUTY_MODE(nr)) & 1);
                if (!manu && duty)
                    /* auto, pwm */
                    data->pwm_enable[nr] = 4;
                else if (manu && !duty)
                    /* manual, speed */
                    data->pwm_enable[nr] = 3;
                else if (!manu && !duty)
                    /* automatic, speed */
                    data->pwm_enable[nr] = 2;
                else
                    /* manual, pwm */
                    data->pwm_enable[nr] = 1;
            } else {
                if (!(conf & (1 << F75375_FAN_CTRL_LINEAR(nr))))
                    data->pwm_mode[nr] = 1;

                switch ((mode >> FAN_CTRL_MODE(nr)) & 3) {
                case 0:     /* speed */
                    data->pwm_enable[nr] = 3;
                    break;
                case 1:     /* automatic */
                    data->pwm_enable[nr] = 2;
                    break;
                default:    /* manual */
                    data->pwm_enable[nr] = 1;
                    break;
                }
            }
        }
        return;
    }

    set_pwm_enable_direct(client, 0, f75375s_pdata->pwm_enable[0]);
    set_pwm_enable_direct(client, 1, f75375s_pdata->pwm_enable[1]);
    for (nr = 0; nr < 2; nr++) {
        if (auto_mode_enabled(f75375s_pdata->pwm_enable[nr]) ||
            !duty_mode_enabled(f75375s_pdata->pwm_enable[nr]))
            continue;
        data->pwm[nr] = SENSORS_LIMIT(f75375s_pdata->pwm[nr], 0, 255);
        f75375_write_pwm(client, nr);
    }

}

static int f75375_probe(struct i2c_client *client,
        const struct i2c_device_id *id)
{
    struct f75375_data *data;
    struct f75375s_platform_data *f75375s_pdata = client->dev.platform_data;
    int err;

    if (!i2c_check_functionality(client->adapter,
                I2C_FUNC_SMBUS_BYTE_DATA))
        return -EIO;
    data = devm_kzalloc(&client->dev, sizeof(struct f75375_data),
                GFP_KERNEL);
    if (!data)
        return -ENOMEM;

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

    err = sysfs_create_group(&client->dev.kobj, &f75375_group);
    if (err)
        return err;

    if (data->kind != f75373) {
        err = sysfs_chmod_file(&client->dev.kobj,
            &sensor_dev_attr_pwm1_mode.dev_attr.attr,
            S_IRUGO | S_IWUSR);
        if (err)
            goto exit_remove;
        err = sysfs_chmod_file(&client->dev.kobj,
            &sensor_dev_attr_pwm2_mode.dev_attr.attr,
            S_IRUGO | S_IWUSR);
        if (err)
            goto exit_remove;
    }

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

    f75375_init(client, data, f75375s_pdata);

    return 0;

exit_remove:
    sysfs_remove_group(&client->dev.kobj, &f75375_group);
    return err;
}

static int f75375_remove(struct i2c_client *client)
{
    struct f75375_data *data = i2c_get_clientdata(client);
    hwmon_device_unregister(data->hwmon_dev);
    sysfs_remove_group(&client->dev.kobj, &f75375_group);
    return 0;
}

/* Return 0 if detection is successful, -ENODEV otherwise */
static int f75375_detect(struct i2c_client *client,
             struct i2c_board_info *info)
{
    struct i2c_adapter *adapter = client->adapter;
    u16 vendid, chipid;
    u8 version;
    const char *name;

    vendid = f75375_read16(client, F75375_REG_VENDOR);
    chipid = f75375_read16(client, F75375_CHIP_ID);
    if (vendid != 0x1934)
        return -ENODEV;

    if (chipid == 0x0306)
        name = "f75375";
    else if (chipid == 0x0204)
        name = "f75373";
    else if (chipid == 0x0410)
        name = "f75387";
    else
        return -ENODEV;

    version = f75375_read8(client, F75375_REG_VERSION);
    dev_info(&adapter->dev, "found %s version: %02X\n", name, version);
    strlcpy(info->type, name, I2C_NAME_SIZE);

    return 0;
}

module_i2c_driver(f75375_driver);

MODULE_AUTHOR("Riku Voipio");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("F75373/F75375/F75387 hardware monitoring driver");