// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * 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
 */

#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 */
        bool 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 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 = true;
        }

        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:
                WARN(1, "Unexpected pwm_enable value %d\n", pwm_enable);
                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:
                WARN(1, "Unexpected pwm_enable value %d\n", pwm_enable);
                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] = clamp_val(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 = clamp_val(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 = clamp_val(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 = clamp_val(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 = clamp_val(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] = clamp_val(f75375s_pdata->pwm[nr], 0, 255);
                f75375_write_pwm(client, nr);
        }

}

static int f75375_probe(struct i2c_client *client)
{
        struct f75375_data *data;
        struct f75375s_platform_data *f75375s_pdata =
                        dev_get_platdata(&client->dev);
        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 = (uintptr_t)i2c_get_match_data(client);

        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 void 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 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);
        strscpy(info->type, name, I2C_NAME_SIZE);

        return 0;
}

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,
};
module_i2c_driver(f75375_driver);

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