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f75375s.c

/*
 * f75375s.c - driver for the Fintek F75375/SP and F75373
 *             hardware monitoring features
 * Copyright (C) 2006-2007  Riku Voipio <riku.voipio@movial.fi>
 *
 * Datasheets available at:
 *
 * f75375:
 * http://www.fintek.com.tw/files/productfiles/2005111152950.pdf
 *
 * f75373:
 * http://www.fintek.com.tw/files/productfiles/2005111153128.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>

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

/* Insmod parameters */
I2C_CLIENT_INSMOD_2(f75373, f75375);

/* 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 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 FAN_CTRL_LINEAR(nr)         (4 + nr)
#define FAN_CTRL_MODE(nr)           (5 + ((nr) * 2))

/*
 * Data structures and manipulation thereof
 */

struct f75375_data {
      unsigned short addr;
      struct i2c_client *client;
      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_full[2];
      u16 fan_exp[2];
      u8 fan_timer;
      u8 pwm[2];
      u8 pwm_mode[2];
      u8 pwm_enable[2];
      s8 temp[2];
      s8 temp_high[2];
      s8 temp_max_hyst[2];
};

static int f75375_attach_adapter(struct i2c_adapter *adapter);
static int f75375_detect(struct i2c_adapter *adapter, int address, int kind);
static int f75375_detach_client(struct i2c_client *client);
static int f75375_probe(struct i2c_client *client);
static int f75375_remove(struct i2c_client *client);

static struct i2c_driver f75375_legacy_driver = {
      .driver = {
            .name = "f75375_legacy",
      },
      .attach_adapter = f75375_attach_adapter,
      .detach_client = f75375_detach_client,
};

static struct i2c_driver f75375_driver = {
      .driver = {
            .name = "f75375",
      },
      .probe = f75375_probe,
      .remove = f75375_remove,
};

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 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_full[nr] =
                        f75375_read16(client, F75375_REG_FAN_FULL(nr));
                  data->fan_min[nr] =
                        f75375_read16(client, F75375_REG_FAN_MIN(nr));
                  data->fan_exp[nr] =
                        f75375_read16(client, F75375_REG_FAN_EXP(nr));
                  data->pwm[nr] =   f75375_read8(client,
                        F75375_REG_FAN_PWM_DUTY(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->temp[nr] =
                        f75375_read8(client, F75375_REG_TEMP(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 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);
      int val = simple_strtoul(buf, NULL, 10);

      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_exp(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);
      int val = simple_strtoul(buf, NULL, 10);

      mutex_lock(&data->update_lock);
      data->fan_exp[nr] = rpm_to_reg(val);
      f75375_write16(client, F75375_REG_FAN_EXP(nr), data->fan_exp[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);
      int val = simple_strtoul(buf, NULL, 10);

      mutex_lock(&data->update_lock);
      data->pwm[nr] = SENSORS_LIMIT(val, 0, 255);
      f75375_write8(client, F75375_REG_FAN_PWM_DUTY(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 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);
      fanmode = ~(3 << FAN_CTRL_MODE(nr));

      switch (val) {
      case 0: /* Full speed */
            fanmode  |= (3 << FAN_CTRL_MODE(nr));
            data->pwm[nr] = 255;
            f75375_write8(client, F75375_REG_FAN_PWM_DUTY(nr),
                        data->pwm[nr]);
            break;
      case 1: /* PWM */
            fanmode  |= (3 << FAN_CTRL_MODE(nr));
            break;
      case 2: /* AUTOMATIC*/
            fanmode  |= (2 << FAN_CTRL_MODE(nr));
            break;
      case 3: /* fan speed */
            break;
      }
      f75375_write8(client, F75375_REG_FAN_TIMER, fanmode);
      data->pwm_enable[nr] = val;
      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);
      int val = simple_strtoul(buf, NULL, 10);
      int err = 0;

      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);
      int val = simple_strtoul(buf, NULL, 10);
      u8 conf = 0;

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

      mutex_lock(&data->update_lock);
      conf = f75375_read8(client, F75375_REG_CONFIG1);
      conf = ~(1 << FAN_CTRL_LINEAR(nr));

      if (val == 0)
            conf |= (1 << FAN_CTRL_LINEAR(nr)) ;

      f75375_write8(client, F75375_REG_CONFIG1, 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);
      int val = simple_strtoul(buf, NULL, 10);
      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);
      int val = simple_strtoul(buf, NULL, 10);
      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)

static ssize_t show_temp(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[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);
      int val = simple_strtol(buf, NULL, 10);
      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);
      int val = simple_strtol(buf, NULL, 10);
      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_full);
show_fan(fan_exp);

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_temp, 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_temp, 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_full, S_IRUGO, show_fan_full, NULL, 0);
static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO|S_IWUSR,
      show_fan_min, set_fan_min, 0);
static SENSOR_DEVICE_ATTR(fan1_exp, S_IRUGO|S_IWUSR,
      show_fan_exp, set_fan_exp, 0);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
static SENSOR_DEVICE_ATTR(fan2_full, S_IRUGO, show_fan_full, NULL, 1);
static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO|S_IWUSR,
      show_fan_min, set_fan_min, 1);
static SENSOR_DEVICE_ATTR(fan2_exp, S_IRUGO|S_IWUSR,
      show_fan_exp, set_fan_exp, 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_full.dev_attr.attr,
      &sensor_dev_attr_fan1_min.dev_attr.attr,
      &sensor_dev_attr_fan1_exp.dev_attr.attr,
      &sensor_dev_attr_fan2_input.dev_attr.attr,
      &sensor_dev_attr_fan2_full.dev_attr.attr,
      &sensor_dev_attr_fan2_min.dev_attr.attr,
      &sensor_dev_attr_fan2_exp.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 int f75375_detach_client(struct i2c_client *client)
{
      int err;

      f75375_remove(client);
      err = i2c_detach_client(client);
      if (err) {
            dev_err(&client->dev,
                  "Client deregistration failed, "
                  "client not detached.\n");
            return err;
      }
      kfree(client);
      return 0;
}

static void f75375_init(struct i2c_client *client, struct f75375_data *data,
            struct f75375s_platform_data *f75375s_pdata)
{
      int nr;
      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++) {
            data->pwm[nr] = SENSORS_LIMIT(f75375s_pdata->pwm[nr], 0, 255);
            f75375_write8(client, F75375_REG_FAN_PWM_DUTY(nr),
                  data->pwm[nr]);
      }

}

static int f75375_probe(struct i2c_client *client)
{
      struct f75375_data *data = i2c_get_clientdata(client);
      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;
      if (!(data = kzalloc(sizeof(struct f75375_data), GFP_KERNEL)))
            return -ENOMEM;

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

      if (strcmp(client->name, "f75375") == 0)
            data->kind = f75375;
      else if (strcmp(client->name, "f75373") == 0)
            data->kind = f75373;
      else {
            dev_err(&client->dev, "Unsupported device: %s\n", client->name);
            return -ENODEV;
      }

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

      if (data->kind == f75375) {
            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;
      }

      if (f75375s_pdata != NULL)
            f75375_init(client, data, f75375s_pdata);

      return 0;

exit_remove:
      sysfs_remove_group(&client->dev.kobj, &f75375_group);
exit_free:
      kfree(data);
      i2c_set_clientdata(client, NULL);
      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);
      kfree(data);
      i2c_set_clientdata(client, NULL);
      return 0;
}

static int f75375_attach_adapter(struct i2c_adapter *adapter)
{
      if (!(adapter->class & I2C_CLASS_HWMON))
            return 0;
      return i2c_probe(adapter, &addr_data, f75375_detect);
}

/* This function is called by i2c_probe */
static int f75375_detect(struct i2c_adapter *adapter, int address, int kind)
{
      struct i2c_client *client;
      u8 version = 0;
      int err = 0;
      const char *name = "";

      if (!(client = kzalloc(sizeof(*client), GFP_KERNEL))) {
            err = -ENOMEM;
            goto exit;
      }
      client->addr = address;
      client->adapter = adapter;
      client->driver = &f75375_legacy_driver;

      if (kind < 0) {
            u16 vendid = f75375_read16(client, F75375_REG_VENDOR);
            u16 chipid = f75375_read16(client, F75375_CHIP_ID);
            version = f75375_read8(client, F75375_REG_VERSION);
            if (chipid == 0x0306 && vendid == 0x1934) {
                  kind = f75375;
            } else if (chipid == 0x0204 && vendid == 0x1934) {
                  kind = f75373;
            } else {
                  dev_err(&adapter->dev,
                        "failed,%02X,%02X,%02X\n",
                        chipid, version, vendid);
                  goto exit_free;
            }
      }

      if (kind == f75375) {
            name = "f75375";
      } else if (kind == f75373) {
            name = "f75373";
      }
      dev_info(&adapter->dev, "found %s version: %02X\n", name, version);
      strlcpy(client->name, name, I2C_NAME_SIZE);

      if ((err = i2c_attach_client(client)))
            goto exit_free;

      if ((err = f75375_probe(client)) < 0)
            goto exit_detach;

      return 0;

exit_detach:
      i2c_detach_client(client);
exit_free:
      kfree(client);
exit:
      return err;
}

static int __init sensors_f75375_init(void)
{
      int status;
      status = i2c_add_driver(&f75375_driver);
      if (status)
            return status;

      status = i2c_add_driver(&f75375_legacy_driver);
      if (status)
            i2c_del_driver(&f75375_driver);

      return status;
}

static void __exit sensors_f75375_exit(void)
{
      i2c_del_driver(&f75375_legacy_driver);
      i2c_del_driver(&f75375_driver);
}

MODULE_AUTHOR("Riku Voipio <riku.voipio@movial.fi>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("F75373/F75375 hardware monitoring driver");

module_init(sensors_f75375_init);
module_exit(sensors_f75375_exit);

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