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vt1211.c

/*
 * vt1211.c - driver for the VIA VT1211 Super-I/O chip integrated hardware
 *            monitoring features
 * Copyright (C) 2006 Juerg Haefliger <juergh@gmail.com>
 *
 * This driver is based on the driver for kernel 2.4 by Mark D. Studebaker
 * and its port to kernel 2.6 by Lars Ekman.
 *
 * 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/platform_device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon-vid.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/ioport.h>
#include <asm/io.h>

static int uch_config = -1;
module_param(uch_config, int, 0);
MODULE_PARM_DESC(uch_config, "Initialize the universal channel configuration");

static int int_mode = -1;
module_param(int_mode, int, 0);
MODULE_PARM_DESC(int_mode, "Force the temperature interrupt mode");

static struct platform_device *pdev;

#define DRVNAME "vt1211"

/* ---------------------------------------------------------------------
 * Registers
 *
 * The sensors are defined as follows.
 *
 * Sensor          Voltage Mode   Temp Mode   Notes (from the datasheet)
 * --------        ------------   ---------   --------------------------
 * Reading 1                      temp1       Intel thermal diode
 * Reading 3                      temp2       Internal thermal diode
 * UCH1/Reading2   in0            temp3       NTC type thermistor
 * UCH2            in1            temp4       +2.5V
 * UCH3            in2            temp5       VccP
 * UCH4            in3            temp6       +5V
 * UCH5            in4            temp7       +12V
 * 3.3V            in5                        Internal VDD (+3.3V)
 *
 * --------------------------------------------------------------------- */

/* Voltages (in) numbered 0-5 (ix) */
#define VT1211_REG_IN(ix)           (0x21 + (ix))
#define VT1211_REG_IN_MIN(ix)       ((ix) == 0 ? 0x3e : 0x2a + 2 * (ix))
#define VT1211_REG_IN_MAX(ix)       ((ix) == 0 ? 0x3d : 0x29 + 2 * (ix))

/* Temperatures (temp) numbered 0-6 (ix) */
static u8 regtemp[]     = {0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25};
static u8 regtempmax[]  = {0x39, 0x1d, 0x3d, 0x2b, 0x2d, 0x2f, 0x31};
static u8 regtemphyst[] = {0x3a, 0x1e, 0x3e, 0x2c, 0x2e, 0x30, 0x32};

/* Fans numbered 0-1 (ix) */
#define VT1211_REG_FAN(ix)          (0x29 + (ix))
#define VT1211_REG_FAN_MIN(ix)            (0x3b + (ix))
#define VT1211_REG_FAN_DIV           0x47

/* PWMs numbered 0-1 (ix) */
/* Auto points numbered 0-3 (ap) */
#define VT1211_REG_PWM(ix)          (0x60 + (ix))
#define VT1211_REG_PWM_CLK           0x50
#define VT1211_REG_PWM_CTL           0x51
#define VT1211_REG_PWM_AUTO_TEMP(ap)      (0x55 - (ap))
#define VT1211_REG_PWM_AUTO_PWM(ix, ap)   (0x58 + 2 * (ix) - (ap))

/* Miscellaneous registers */
#define VT1211_REG_CONFIG           0x40
#define VT1211_REG_ALARM1           0x41
#define VT1211_REG_ALARM2           0x42
#define VT1211_REG_VID              0x45
#define VT1211_REG_UCH_CONFIG       0x4a
#define VT1211_REG_TEMP1_CONFIG           0x4b
#define VT1211_REG_TEMP2_CONFIG           0x4c

/* In, temp & fan alarm bits */
static const u8 bitalarmin[]  = {11, 0, 1, 3, 8, 2, 9};
static const u8 bitalarmtemp[]      = {4, 15, 11, 0, 1, 3, 8};
static const u8 bitalarmfan[] = {6, 7};

/* ---------------------------------------------------------------------
 * Data structures and manipulation thereof
 * --------------------------------------------------------------------- */

struct vt1211_data {
      unsigned short addr;
      const char *name;
      struct device *hwmon_dev;

      struct mutex update_lock;
      char valid;             /* !=0 if following fields are valid */
      unsigned long last_updated;   /* In jiffies */

      /* Register values */
      u8  in[6];
      u8  in_max[6];
      u8  in_min[6];
      u8  temp[7];
      u8  temp_max[7];
      u8  temp_hyst[7];
      u8  fan[2];
      u8  fan_min[2];
      u8  fan_div[2];
      u8  fan_ctl;
      u8  pwm[2];
      u8  pwm_ctl[2];
      u8  pwm_clk;
      u8  pwm_auto_temp[4];
      u8  pwm_auto_pwm[2][4];
      u8  vid;          /* Read once at init time */
      u8  vrm;
      u8  uch_config;         /* Read once at init time */
      u16 alarms;
};

/* ix = [0-5] */
#define ISVOLT(ix, uch_config)      ((ix) > 4 ? 1 : \
                         !(((uch_config) >> ((ix) + 2)) & 1))

/* ix = [0-6] */
#define ISTEMP(ix, uch_config)      ((ix) < 2 ? 1 : \
                         ((uch_config) >> (ix)) & 1)

/* in5 (ix = 5) is special. It's the internal 3.3V so it's scaled in the
   driver according to the VT1211 BIOS porting guide */
#define IN_FROM_REG(ix, reg)  ((reg) < 3 ? 0 : (ix) == 5 ? \
                         (((reg) - 3) * 15882 + 479) / 958 : \
                         (((reg) - 3) * 10000 + 479) / 958)
#define IN_TO_REG(ix, val)    (SENSORS_LIMIT((ix) == 5 ? \
                         ((val) * 958 + 7941) / 15882 + 3 : \
                         ((val) * 958 + 5000) / 10000 + 3, 0, 255))

/* temp1 (ix = 0) is an intel thermal diode which is scaled in user space.
   temp2 (ix = 1) is the internal temp diode so it's scaled in the driver
   according to some measurements that I took on an EPIA M10000.
   temp3-7 are thermistor based so the driver returns the voltage measured at
   the pin (range 0V - 2.2V). */
#define TEMP_FROM_REG(ix, reg)      ((ix) == 0 ? (reg) * 1000 : \
                         (ix) == 1 ? (reg) < 51 ? 0 : \
                         ((reg) - 51) * 1000 : \
                         ((253 - (reg)) * 2200 + 105) / 210)
#define TEMP_TO_REG(ix, val)  SENSORS_LIMIT( \
                         ((ix) == 0 ? ((val) + 500) / 1000 : \
                          (ix) == 1 ? ((val) + 500) / 1000 + 51 : \
                          253 - ((val) * 210 + 1100) / 2200), 0, 255)

#define DIV_FROM_REG(reg)     (1 << (reg))

#define RPM_FROM_REG(reg, div)      (((reg) == 0) || ((reg) == 255) ? 0 : \
                         1310720 / (reg) / DIV_FROM_REG(div))
#define RPM_TO_REG(val, div)  ((val) == 0 ? 255 : \
                         SENSORS_LIMIT((1310720 / (val) / \
                         DIV_FROM_REG(div)), 1, 254))

/* ---------------------------------------------------------------------
 * Super-I/O constants and functions
 * --------------------------------------------------------------------- */

/* Configuration index port registers
 * The vt1211 can live at 2 different addresses so we need to probe both */
#define SIO_REG_CIP1          0x2e
#define SIO_REG_CIP2          0x4e

/* Configuration registers */
#define SIO_VT1211_LDN        0x07  /* logical device number */
#define SIO_VT1211_DEVID      0x20  /* device ID */
#define SIO_VT1211_DEVREV     0x21  /* device revision */
#define SIO_VT1211_ACTIVE     0x30  /* HW monitor active */
#define SIO_VT1211_BADDR      0x60  /* base I/O address */
#define SIO_VT1211_ID         0x3c  /* VT1211 device ID */

/* VT1211 logical device numbers */
#define SIO_VT1211_LDN_HWMON  0x0b  /* HW monitor */

static inline void superio_outb(int sio_cip, int reg, int val)
{
      outb(reg, sio_cip);
      outb(val, sio_cip + 1);
}

static inline int superio_inb(int sio_cip, int reg)
{
      outb(reg, sio_cip);
      return inb(sio_cip + 1);
}

static inline void superio_select(int sio_cip, int ldn)
{
      outb(SIO_VT1211_LDN, sio_cip);
      outb(ldn, sio_cip + 1);
}

static inline void superio_enter(int sio_cip)
{
      outb(0x87, sio_cip);
      outb(0x87, sio_cip);
}

static inline void superio_exit(int sio_cip)
{
      outb(0xaa, sio_cip);
}

/* ---------------------------------------------------------------------
 * Device I/O access
 * --------------------------------------------------------------------- */

static inline u8 vt1211_read8(struct vt1211_data *data, u8 reg)
{
      return inb(data->addr + reg);
}

static inline void vt1211_write8(struct vt1211_data *data, u8 reg, u8 val)
{
      outb(val, data->addr + reg);
}

static struct vt1211_data *vt1211_update_device(struct device *dev)
{
      struct vt1211_data *data = dev_get_drvdata(dev);
      int ix, val;

      mutex_lock(&data->update_lock);

      /* registers cache is refreshed after 1 second */
      if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
            /* read VID */
            data->vid = vt1211_read8(data, VT1211_REG_VID) & 0x1f;

            /* voltage (in) registers */
            for (ix = 0; ix < ARRAY_SIZE(data->in); ix++) {
                  if (ISVOLT(ix, data->uch_config)) {
                        data->in[ix] = vt1211_read8(data,
                                    VT1211_REG_IN(ix));
                        data->in_min[ix] = vt1211_read8(data,
                                    VT1211_REG_IN_MIN(ix));
                        data->in_max[ix] = vt1211_read8(data,
                                    VT1211_REG_IN_MAX(ix));
                  }
            }

            /* temp registers */
            for (ix = 0; ix < ARRAY_SIZE(data->temp); ix++) {
                  if (ISTEMP(ix, data->uch_config)) {
                        data->temp[ix] = vt1211_read8(data,
                                    regtemp[ix]);
                        data->temp_max[ix] = vt1211_read8(data,
                                    regtempmax[ix]);
                        data->temp_hyst[ix] = vt1211_read8(data,
                                    regtemphyst[ix]);
                  }
            }

            /* fan & pwm registers */
            for (ix = 0; ix < ARRAY_SIZE(data->fan); ix++) {
                  data->fan[ix] = vt1211_read8(data,
                                    VT1211_REG_FAN(ix));
                  data->fan_min[ix] = vt1211_read8(data,
                                    VT1211_REG_FAN_MIN(ix));
                  data->pwm[ix] = vt1211_read8(data,
                                    VT1211_REG_PWM(ix));
            }
            val = vt1211_read8(data, VT1211_REG_FAN_DIV);
            data->fan_div[0] = (val >> 4) & 3;
            data->fan_div[1] = (val >> 6) & 3;
            data->fan_ctl = val & 0xf;

            val = vt1211_read8(data, VT1211_REG_PWM_CTL);
            data->pwm_ctl[0] = val & 0xf;
            data->pwm_ctl[1] = (val >> 4) & 0xf;

            data->pwm_clk = vt1211_read8(data, VT1211_REG_PWM_CLK);

            /* pwm & temp auto point registers */
            data->pwm_auto_pwm[0][1] = vt1211_read8(data,
                                    VT1211_REG_PWM_AUTO_PWM(0, 1));
            data->pwm_auto_pwm[0][2] = vt1211_read8(data,
                                    VT1211_REG_PWM_AUTO_PWM(0, 2));
            data->pwm_auto_pwm[1][1] = vt1211_read8(data,
                                    VT1211_REG_PWM_AUTO_PWM(1, 1));
            data->pwm_auto_pwm[1][2] = vt1211_read8(data,
                                    VT1211_REG_PWM_AUTO_PWM(1, 2));
            for (ix = 0; ix < ARRAY_SIZE(data->pwm_auto_temp); ix++) {
                  data->pwm_auto_temp[ix] = vt1211_read8(data,
                                    VT1211_REG_PWM_AUTO_TEMP(ix));
            }

            /* alarm registers */
            data->alarms = (vt1211_read8(data, VT1211_REG_ALARM2) << 8) |
                        vt1211_read8(data, VT1211_REG_ALARM1);

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

      mutex_unlock(&data->update_lock);

      return data;
}

/* ---------------------------------------------------------------------
 * Voltage sysfs interfaces
 * ix = [0-5]
 * --------------------------------------------------------------------- */

#define SHOW_IN_INPUT   0
#define SHOW_SET_IN_MIN 1
#define SHOW_SET_IN_MAX 2
#define SHOW_IN_ALARM   3

static ssize_t show_in(struct device *dev, struct device_attribute *attr,
                   char *buf)
{
      struct vt1211_data *data = vt1211_update_device(dev);
      struct sensor_device_attribute_2 *sensor_attr_2 =
                                    to_sensor_dev_attr_2(attr);
      int ix = sensor_attr_2->index;
      int fn = sensor_attr_2->nr;
      int res;

      switch (fn) {
      case SHOW_IN_INPUT:
            res = IN_FROM_REG(ix, data->in[ix]);
            break;
      case SHOW_SET_IN_MIN:
            res = IN_FROM_REG(ix, data->in_min[ix]);
            break;
      case SHOW_SET_IN_MAX:
            res = IN_FROM_REG(ix, data->in_max[ix]);
            break;
      case SHOW_IN_ALARM:
            res = (data->alarms >> bitalarmin[ix]) & 1;
            break;
      default:
            res = 0;
            dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
      }

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

static ssize_t set_in(struct device *dev, struct device_attribute *attr,
                  const char *buf, size_t count)
{
      struct vt1211_data *data = dev_get_drvdata(dev);
      struct sensor_device_attribute_2 *sensor_attr_2 =
                                    to_sensor_dev_attr_2(attr);
      int ix = sensor_attr_2->index;
      int fn = sensor_attr_2->nr;
      long val = simple_strtol(buf, NULL, 10);

      mutex_lock(&data->update_lock);
      switch (fn) {
      case SHOW_SET_IN_MIN:
            data->in_min[ix] = IN_TO_REG(ix, val);
            vt1211_write8(data, VT1211_REG_IN_MIN(ix), data->in_min[ix]);
            break;
      case SHOW_SET_IN_MAX:
            data->in_max[ix] = IN_TO_REG(ix, val);
            vt1211_write8(data, VT1211_REG_IN_MAX(ix), data->in_max[ix]);
            break;
      default:
            dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
      }
      mutex_unlock(&data->update_lock);

      return count;
}

/* ---------------------------------------------------------------------
 * Temperature sysfs interfaces
 * ix = [0-6]
 * --------------------------------------------------------------------- */

#define SHOW_TEMP_INPUT       0
#define SHOW_SET_TEMP_MAX     1
#define SHOW_SET_TEMP_MAX_HYST      2
#define SHOW_TEMP_ALARM       3

static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
                   char *buf)
{
      struct vt1211_data *data = vt1211_update_device(dev);
      struct sensor_device_attribute_2 *sensor_attr_2 =
                                    to_sensor_dev_attr_2(attr);
      int ix = sensor_attr_2->index;
      int fn = sensor_attr_2->nr;
      int res;

      switch (fn) {
      case SHOW_TEMP_INPUT:
            res = TEMP_FROM_REG(ix, data->temp[ix]);
            break;
      case SHOW_SET_TEMP_MAX:
            res = TEMP_FROM_REG(ix, data->temp_max[ix]);
            break;
      case SHOW_SET_TEMP_MAX_HYST:
            res = TEMP_FROM_REG(ix, data->temp_hyst[ix]);
            break;
      case SHOW_TEMP_ALARM:
            res = (data->alarms >> bitalarmtemp[ix]) & 1;
            break;
      default:
            res = 0;
            dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
      }

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

static ssize_t set_temp(struct device *dev, struct device_attribute *attr,
                  const char *buf, size_t count)
{
      struct vt1211_data *data = dev_get_drvdata(dev);
      struct sensor_device_attribute_2 *sensor_attr_2 =
                                    to_sensor_dev_attr_2(attr);
      int ix = sensor_attr_2->index;
      int fn = sensor_attr_2->nr;
      long val = simple_strtol(buf, NULL, 10);

      mutex_lock(&data->update_lock);
      switch (fn) {
      case SHOW_SET_TEMP_MAX:
            data->temp_max[ix] = TEMP_TO_REG(ix, val);
            vt1211_write8(data, regtempmax[ix],
                        data->temp_max[ix]);
            break;
      case SHOW_SET_TEMP_MAX_HYST:
            data->temp_hyst[ix] = TEMP_TO_REG(ix, val);
            vt1211_write8(data, regtemphyst[ix],
                        data->temp_hyst[ix]);
            break;
      default:
            dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
      }
      mutex_unlock(&data->update_lock);

      return count;
}

/* ---------------------------------------------------------------------
 * Fan sysfs interfaces
 * ix = [0-1]
 * --------------------------------------------------------------------- */

#define SHOW_FAN_INPUT        0
#define SHOW_SET_FAN_MIN      1
#define SHOW_SET_FAN_DIV      2
#define SHOW_FAN_ALARM        3

static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
                  char *buf)
{
      struct vt1211_data *data = vt1211_update_device(dev);
      struct sensor_device_attribute_2 *sensor_attr_2 =
                                    to_sensor_dev_attr_2(attr);
      int ix = sensor_attr_2->index;
      int fn = sensor_attr_2->nr;
      int res;

      switch (fn) {
      case SHOW_FAN_INPUT:
            res = RPM_FROM_REG(data->fan[ix], data->fan_div[ix]);
            break;
      case SHOW_SET_FAN_MIN:
            res = RPM_FROM_REG(data->fan_min[ix], data->fan_div[ix]);
            break;
      case SHOW_SET_FAN_DIV:
            res = DIV_FROM_REG(data->fan_div[ix]);
            break;
      case SHOW_FAN_ALARM:
            res = (data->alarms >> bitalarmfan[ix]) & 1;
            break;
      default:
            res = 0;
            dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
      }

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

static ssize_t set_fan(struct device *dev, struct device_attribute *attr,
                   const char *buf, size_t count)
{
      struct vt1211_data *data = dev_get_drvdata(dev);
      struct sensor_device_attribute_2 *sensor_attr_2 =
                                    to_sensor_dev_attr_2(attr);
      int ix = sensor_attr_2->index;
      int fn = sensor_attr_2->nr;
      long val = simple_strtol(buf, NULL, 10);
      int reg;

      mutex_lock(&data->update_lock);

      /* sync the data cache */
      reg = vt1211_read8(data, VT1211_REG_FAN_DIV);
      data->fan_div[0] = (reg >> 4) & 3;
      data->fan_div[1] = (reg >> 6) & 3;
      data->fan_ctl = reg & 0xf;

      switch (fn) {
      case SHOW_SET_FAN_MIN:
            data->fan_min[ix] = RPM_TO_REG(val, data->fan_div[ix]);
            vt1211_write8(data, VT1211_REG_FAN_MIN(ix),
                        data->fan_min[ix]);
            break;
      case SHOW_SET_FAN_DIV:
            switch (val) {
                  case 1: data->fan_div[ix] = 0; break;
                  case 2: data->fan_div[ix] = 1; break;
                  case 4: data->fan_div[ix] = 2; break;
                  case 8: data->fan_div[ix] = 3; break;
                  default:
                        count = -EINVAL;
                        dev_warn(dev, "fan div value %ld not "
                               "supported. Choose one of 1, 2, "
                               "4, or 8.\n", val);
                        goto EXIT;
            }
            vt1211_write8(data, VT1211_REG_FAN_DIV,
                        ((data->fan_div[1] << 6) |
                         (data->fan_div[0] << 4) |
                        data->fan_ctl));
            break;
      default:
            dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
      }

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

/* ---------------------------------------------------------------------
 * PWM sysfs interfaces
 * ix = [0-1]
 * --------------------------------------------------------------------- */

#define SHOW_PWM              0
#define SHOW_SET_PWM_ENABLE         1
#define SHOW_SET_PWM_FREQ           2
#define SHOW_SET_PWM_AUTO_CHANNELS_TEMP   3

static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
                  char *buf)
{
      struct vt1211_data *data = vt1211_update_device(dev);
      struct sensor_device_attribute_2 *sensor_attr_2 =
                                    to_sensor_dev_attr_2(attr);
      int ix = sensor_attr_2->index;
      int fn = sensor_attr_2->nr;
      int res;

      switch (fn) {
      case SHOW_PWM:
            res = data->pwm[ix];
            break;
      case SHOW_SET_PWM_ENABLE:
            res = ((data->pwm_ctl[ix] >> 3) & 1) ? 2 : 0;
            break;
      case SHOW_SET_PWM_FREQ:
            res = 90000 >> (data->pwm_clk & 7);
            break;
      case SHOW_SET_PWM_AUTO_CHANNELS_TEMP:
            res = (data->pwm_ctl[ix] & 7) + 1;
            break;
      default:
            res = 0;
            dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
      }

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

static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
                   const char *buf, size_t count)
{
      struct vt1211_data *data = dev_get_drvdata(dev);
      struct sensor_device_attribute_2 *sensor_attr_2 =
                                    to_sensor_dev_attr_2(attr);
      int ix = sensor_attr_2->index;
      int fn = sensor_attr_2->nr;
      long val = simple_strtol(buf, NULL, 10);
      int tmp, reg;

      mutex_lock(&data->update_lock);

      switch (fn) {
      case SHOW_SET_PWM_ENABLE:
            /* sync the data cache */
            reg = vt1211_read8(data, VT1211_REG_FAN_DIV);
            data->fan_div[0] = (reg >> 4) & 3;
            data->fan_div[1] = (reg >> 6) & 3;
            data->fan_ctl = reg & 0xf;
            reg = vt1211_read8(data, VT1211_REG_PWM_CTL);
            data->pwm_ctl[0] = reg & 0xf;
            data->pwm_ctl[1] = (reg >> 4) & 0xf;
            switch (val) {
            case 0:
                  data->pwm_ctl[ix] &= 7;
                  /* disable SmartGuardian if both PWM outputs are
                   * disabled */
                  if ((data->pwm_ctl[ix ^ 1] & 1) == 0) {
                        data->fan_ctl &= 0xe;
                  }
                  break;
            case 2:
                  data->pwm_ctl[ix] |= 8;
                  data->fan_ctl |= 1;
                  break;
            default:
                  count = -EINVAL;
                  dev_warn(dev, "pwm mode %ld not supported. "
                         "Choose one of 0 or 2.\n", val);
                  goto EXIT;
            }
            vt1211_write8(data, VT1211_REG_PWM_CTL,
                        ((data->pwm_ctl[1] << 4) |
                        data->pwm_ctl[0]));
            vt1211_write8(data, VT1211_REG_FAN_DIV,
                        ((data->fan_div[1] << 6) |
                         (data->fan_div[0] << 4) |
                        data->fan_ctl));
            break;
      case SHOW_SET_PWM_FREQ:
            val = 135000 / SENSORS_LIMIT(val, 135000 >> 7, 135000);
            /* calculate tmp = log2(val) */
            tmp = 0;
            for (val >>= 1; val > 0; val >>= 1) {
                  tmp++;
            }
            /* sync the data cache */
            reg = vt1211_read8(data, VT1211_REG_PWM_CLK);
            data->pwm_clk = (reg & 0xf8) | tmp;
            vt1211_write8(data, VT1211_REG_PWM_CLK, data->pwm_clk);
            break;
      case SHOW_SET_PWM_AUTO_CHANNELS_TEMP:
            if ((val < 1) || (val > 7)) {
                  count = -EINVAL;
                  dev_warn(dev, "temp channel %ld not supported. "
                         "Choose a value between 1 and 7.\n", val);
                  goto EXIT;
            }
            if (!ISTEMP(val - 1, data->uch_config)) {
                  count = -EINVAL;
                  dev_warn(dev, "temp channel %ld is not available.\n",
                         val);
                  goto EXIT;
            }
            /* sync the data cache */
            reg = vt1211_read8(data, VT1211_REG_PWM_CTL);
            data->pwm_ctl[0] = reg & 0xf;
            data->pwm_ctl[1] = (reg >> 4) & 0xf;
            data->pwm_ctl[ix] = (data->pwm_ctl[ix] & 8) | (val - 1);
            vt1211_write8(data, VT1211_REG_PWM_CTL,
                        ((data->pwm_ctl[1] << 4) | data->pwm_ctl[0]));
            break;
      default:
            dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
      }

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

/* ---------------------------------------------------------------------
 * PWM auto point definitions
 * ix = [0-1]
 * ap = [0-3]
 * --------------------------------------------------------------------- */

/*
 * pwm[ix+1]_auto_point[ap+1]_temp mapping table:
 * Note that there is only a single set of temp auto points that controls both
 * PWM controllers. We still create 2 sets of sysfs files to make it look
 * more consistent even though they map to the same registers.
 *
 * ix ap : description
 * -------------------
 * 0  0  : pwm1/2 off temperature        (pwm_auto_temp[0])
 * 0  1  : pwm1/2 low speed temperature  (pwm_auto_temp[1])
 * 0  2  : pwm1/2 high speed temperature (pwm_auto_temp[2])
 * 0  3  : pwm1/2 full speed temperature (pwm_auto_temp[3])
 * 1  0  : pwm1/2 off temperature        (pwm_auto_temp[0])
 * 1  1  : pwm1/2 low speed temperature  (pwm_auto_temp[1])
 * 1  2  : pwm1/2 high speed temperature (pwm_auto_temp[2])
 * 1  3  : pwm1/2 full speed temperature (pwm_auto_temp[3])
 */

static ssize_t show_pwm_auto_point_temp(struct device *dev,
                              struct device_attribute *attr,
                              char *buf)
{
      struct vt1211_data *data = vt1211_update_device(dev);
      struct sensor_device_attribute_2 *sensor_attr_2 =
                                    to_sensor_dev_attr_2(attr);
      int ix = sensor_attr_2->index;
      int ap = sensor_attr_2->nr;

      return sprintf(buf, "%d\n", TEMP_FROM_REG(data->pwm_ctl[ix] & 7,
                   data->pwm_auto_temp[ap]));
}

static ssize_t set_pwm_auto_point_temp(struct device *dev,
                               struct device_attribute *attr,
                               const char *buf, size_t count)
{
      struct vt1211_data *data = dev_get_drvdata(dev);
      struct sensor_device_attribute_2 *sensor_attr_2 =
                                    to_sensor_dev_attr_2(attr);
      int ix = sensor_attr_2->index;
      int ap = sensor_attr_2->nr;
      long val = simple_strtol(buf, NULL, 10);
      int reg;

      mutex_lock(&data->update_lock);

      /* sync the data cache */
      reg = vt1211_read8(data, VT1211_REG_PWM_CTL);
      data->pwm_ctl[0] = reg & 0xf;
      data->pwm_ctl[1] = (reg >> 4) & 0xf;

      data->pwm_auto_temp[ap] = TEMP_TO_REG(data->pwm_ctl[ix] & 7, val);
      vt1211_write8(data, VT1211_REG_PWM_AUTO_TEMP(ap),
                  data->pwm_auto_temp[ap]);
      mutex_unlock(&data->update_lock);

      return count;
}

/*
 * pwm[ix+1]_auto_point[ap+1]_pwm mapping table:
 * Note that the PWM auto points 0 & 3 are hard-wired in the VT1211 and can't
 * be changed.
 *
 * ix ap : description
 * -------------------
 * 0  0  : pwm1 off                   (pwm_auto_pwm[0][0], hard-wired to 0)
 * 0  1  : pwm1 low speed duty cycle  (pwm_auto_pwm[0][1])
 * 0  2  : pwm1 high speed duty cycle (pwm_auto_pwm[0][2])
 * 0  3  : pwm1 full speed            (pwm_auto_pwm[0][3], hard-wired to 255)
 * 1  0  : pwm2 off                   (pwm_auto_pwm[1][0], hard-wired to 0)
 * 1  1  : pwm2 low speed duty cycle  (pwm_auto_pwm[1][1])
 * 1  2  : pwm2 high speed duty cycle (pwm_auto_pwm[1][2])
 * 1  3  : pwm2 full speed            (pwm_auto_pwm[1][3], hard-wired to 255)
*/

static ssize_t show_pwm_auto_point_pwm(struct device *dev,
                               struct device_attribute *attr,
                               char *buf)
{
      struct vt1211_data *data = vt1211_update_device(dev);
      struct sensor_device_attribute_2 *sensor_attr_2 =
                                    to_sensor_dev_attr_2(attr);
      int ix = sensor_attr_2->index;
      int ap = sensor_attr_2->nr;

      return sprintf(buf, "%d\n", data->pwm_auto_pwm[ix][ap]);
}

static ssize_t set_pwm_auto_point_pwm(struct device *dev,
                              struct device_attribute *attr,
                              const char *buf, size_t count)
{
      struct vt1211_data *data = dev_get_drvdata(dev);
      struct sensor_device_attribute_2 *sensor_attr_2 =
                                    to_sensor_dev_attr_2(attr);
      int ix = sensor_attr_2->index;
      int ap = sensor_attr_2->nr;
      long val = simple_strtol(buf, NULL, 10);

      if ((val < 0) || (val > 255)) {
            dev_err(dev, "pwm value %ld is out of range. "
                  "Choose a value between 0 and 255.\n" , val);
            return -EINVAL;
      }

      mutex_lock(&data->update_lock);
      data->pwm_auto_pwm[ix][ap] = val;
      vt1211_write8(data, VT1211_REG_PWM_AUTO_PWM(ix, ap),
                  data->pwm_auto_pwm[ix][ap]);
      mutex_unlock(&data->update_lock);

      return count;
}

/* ---------------------------------------------------------------------
 * Miscellaneous sysfs interfaces (VRM, VID, name, and (legacy) alarms)
 * --------------------------------------------------------------------- */

static ssize_t show_vrm(struct device *dev, struct device_attribute *attr,
                  char *buf)
{
      struct vt1211_data *data = dev_get_drvdata(dev);

      return sprintf(buf, "%d\n", data->vrm);
}

static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
                   const char *buf, size_t count)
{
      struct vt1211_data *data = dev_get_drvdata(dev);
      long val = simple_strtol(buf, NULL, 10);

      data->vrm = val;

      return count;
}

static ssize_t show_vid(struct device *dev, struct device_attribute *attr,
                  char *buf)
{
      struct vt1211_data *data = dev_get_drvdata(dev);

      return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
}

static ssize_t show_name(struct device *dev,
                   struct device_attribute *attr, char *buf)
{
      struct vt1211_data *data = dev_get_drvdata(dev);

      return sprintf(buf, "%s\n", data->name);
}

static ssize_t show_alarms(struct device *dev,
                     struct device_attribute *attr, char *buf)
{
      struct vt1211_data *data = vt1211_update_device(dev);

      return sprintf(buf, "%d\n", data->alarms);
}

/* ---------------------------------------------------------------------
 * Device attribute structs
 * --------------------------------------------------------------------- */

#define SENSOR_ATTR_IN_INPUT(ix) \
      SENSOR_ATTR_2(in##ix##_input, S_IRUGO, \
            show_in, NULL, SHOW_IN_INPUT, ix)

static struct sensor_device_attribute_2 vt1211_sysfs_in_input[] = {
      SENSOR_ATTR_IN_INPUT(0),
      SENSOR_ATTR_IN_INPUT(1),
      SENSOR_ATTR_IN_INPUT(2),
      SENSOR_ATTR_IN_INPUT(3),
      SENSOR_ATTR_IN_INPUT(4),
      SENSOR_ATTR_IN_INPUT(5),
};

#define SENSOR_ATTR_IN_MIN(ix) \
      SENSOR_ATTR_2(in##ix##_min, S_IRUGO | S_IWUSR, \
            show_in, set_in, SHOW_SET_IN_MIN, ix)

static struct sensor_device_attribute_2 vt1211_sysfs_in_min[] = {
      SENSOR_ATTR_IN_MIN(0),
      SENSOR_ATTR_IN_MIN(1),
      SENSOR_ATTR_IN_MIN(2),
      SENSOR_ATTR_IN_MIN(3),
      SENSOR_ATTR_IN_MIN(4),
      SENSOR_ATTR_IN_MIN(5),
};

#define SENSOR_ATTR_IN_MAX(ix) \
      SENSOR_ATTR_2(in##ix##_max, S_IRUGO | S_IWUSR, \
            show_in, set_in, SHOW_SET_IN_MAX, ix)

static struct sensor_device_attribute_2 vt1211_sysfs_in_max[] = {
      SENSOR_ATTR_IN_MAX(0),
      SENSOR_ATTR_IN_MAX(1),
      SENSOR_ATTR_IN_MAX(2),
      SENSOR_ATTR_IN_MAX(3),
      SENSOR_ATTR_IN_MAX(4),
      SENSOR_ATTR_IN_MAX(5),
};

#define SENSOR_ATTR_IN_ALARM(ix) \
      SENSOR_ATTR_2(in##ix##_alarm, S_IRUGO, \
            show_in, NULL, SHOW_IN_ALARM, ix)

static struct sensor_device_attribute_2 vt1211_sysfs_in_alarm[] = {
      SENSOR_ATTR_IN_ALARM(0),
      SENSOR_ATTR_IN_ALARM(1),
      SENSOR_ATTR_IN_ALARM(2),
      SENSOR_ATTR_IN_ALARM(3),
      SENSOR_ATTR_IN_ALARM(4),
      SENSOR_ATTR_IN_ALARM(5),
};

#define SENSOR_ATTR_TEMP_INPUT(ix) \
      SENSOR_ATTR_2(temp##ix##_input, S_IRUGO, \
            show_temp, NULL, SHOW_TEMP_INPUT, ix-1)

static struct sensor_device_attribute_2 vt1211_sysfs_temp_input[] = {
      SENSOR_ATTR_TEMP_INPUT(1),
      SENSOR_ATTR_TEMP_INPUT(2),
      SENSOR_ATTR_TEMP_INPUT(3),
      SENSOR_ATTR_TEMP_INPUT(4),
      SENSOR_ATTR_TEMP_INPUT(5),
      SENSOR_ATTR_TEMP_INPUT(6),
      SENSOR_ATTR_TEMP_INPUT(7),
};

#define SENSOR_ATTR_TEMP_MAX(ix) \
      SENSOR_ATTR_2(temp##ix##_max, S_IRUGO | S_IWUSR, \
            show_temp, set_temp, SHOW_SET_TEMP_MAX, ix-1)

static struct sensor_device_attribute_2 vt1211_sysfs_temp_max[] = {
      SENSOR_ATTR_TEMP_MAX(1),
      SENSOR_ATTR_TEMP_MAX(2),
      SENSOR_ATTR_TEMP_MAX(3),
      SENSOR_ATTR_TEMP_MAX(4),
      SENSOR_ATTR_TEMP_MAX(5),
      SENSOR_ATTR_TEMP_MAX(6),
      SENSOR_ATTR_TEMP_MAX(7),
};

#define SENSOR_ATTR_TEMP_MAX_HYST(ix) \
      SENSOR_ATTR_2(temp##ix##_max_hyst, S_IRUGO | S_IWUSR, \
            show_temp, set_temp, SHOW_SET_TEMP_MAX_HYST, ix-1)

static struct sensor_device_attribute_2 vt1211_sysfs_temp_max_hyst[] = {
      SENSOR_ATTR_TEMP_MAX_HYST(1),
      SENSOR_ATTR_TEMP_MAX_HYST(2),
      SENSOR_ATTR_TEMP_MAX_HYST(3),
      SENSOR_ATTR_TEMP_MAX_HYST(4),
      SENSOR_ATTR_TEMP_MAX_HYST(5),
      SENSOR_ATTR_TEMP_MAX_HYST(6),
      SENSOR_ATTR_TEMP_MAX_HYST(7),
};

#define SENSOR_ATTR_TEMP_ALARM(ix) \
      SENSOR_ATTR_2(temp##ix##_alarm, S_IRUGO, \
            show_temp, NULL, SHOW_TEMP_ALARM, ix-1)

static struct sensor_device_attribute_2 vt1211_sysfs_temp_alarm[] = {
      SENSOR_ATTR_TEMP_ALARM(1),
      SENSOR_ATTR_TEMP_ALARM(2),
      SENSOR_ATTR_TEMP_ALARM(3),
      SENSOR_ATTR_TEMP_ALARM(4),
      SENSOR_ATTR_TEMP_ALARM(5),
      SENSOR_ATTR_TEMP_ALARM(6),
      SENSOR_ATTR_TEMP_ALARM(7),
};

#define SENSOR_ATTR_FAN(ix) \
      SENSOR_ATTR_2(fan##ix##_input, S_IRUGO, \
            show_fan, NULL, SHOW_FAN_INPUT, ix-1), \
      SENSOR_ATTR_2(fan##ix##_min, S_IRUGO | S_IWUSR, \
            show_fan, set_fan, SHOW_SET_FAN_MIN, ix-1), \
      SENSOR_ATTR_2(fan##ix##_div, S_IRUGO | S_IWUSR, \
            show_fan, set_fan, SHOW_SET_FAN_DIV, ix-1), \
      SENSOR_ATTR_2(fan##ix##_alarm, S_IRUGO, \
            show_fan, NULL, SHOW_FAN_ALARM, ix-1)

#define SENSOR_ATTR_PWM(ix) \
      SENSOR_ATTR_2(pwm##ix, S_IRUGO, \
            show_pwm, NULL, SHOW_PWM, ix-1), \
      SENSOR_ATTR_2(pwm##ix##_enable, S_IRUGO | S_IWUSR, \
            show_pwm, set_pwm, SHOW_SET_PWM_ENABLE, ix-1), \
      SENSOR_ATTR_2(pwm##ix##_auto_channels_temp, S_IRUGO | S_IWUSR, \
            show_pwm, set_pwm, SHOW_SET_PWM_AUTO_CHANNELS_TEMP, ix-1)

#define SENSOR_ATTR_PWM_FREQ(ix) \
      SENSOR_ATTR_2(pwm##ix##_freq, S_IRUGO | S_IWUSR, \
            show_pwm, set_pwm, SHOW_SET_PWM_FREQ, ix-1)

#define SENSOR_ATTR_PWM_FREQ_RO(ix) \
      SENSOR_ATTR_2(pwm##ix##_freq, S_IRUGO, \
            show_pwm, NULL, SHOW_SET_PWM_FREQ, ix-1)

#define SENSOR_ATTR_PWM_AUTO_POINT_TEMP(ix, ap) \
      SENSOR_ATTR_2(pwm##ix##_auto_point##ap##_temp, S_IRUGO | S_IWUSR, \
            show_pwm_auto_point_temp, set_pwm_auto_point_temp, \
            ap-1, ix-1)

#define SENSOR_ATTR_PWM_AUTO_POINT_TEMP_RO(ix, ap) \
      SENSOR_ATTR_2(pwm##ix##_auto_point##ap##_temp, S_IRUGO, \
            show_pwm_auto_point_temp, NULL, \
            ap-1, ix-1)

#define SENSOR_ATTR_PWM_AUTO_POINT_PWM(ix, ap) \
      SENSOR_ATTR_2(pwm##ix##_auto_point##ap##_pwm, S_IRUGO | S_IWUSR, \
            show_pwm_auto_point_pwm, set_pwm_auto_point_pwm, \
            ap-1, ix-1)

#define SENSOR_ATTR_PWM_AUTO_POINT_PWM_RO(ix, ap) \
      SENSOR_ATTR_2(pwm##ix##_auto_point##ap##_pwm, S_IRUGO, \
            show_pwm_auto_point_pwm, NULL, \
            ap-1, ix-1)

static struct sensor_device_attribute_2 vt1211_sysfs_fan_pwm[] = {
      SENSOR_ATTR_FAN(1),
      SENSOR_ATTR_FAN(2),
      SENSOR_ATTR_PWM(1),
      SENSOR_ATTR_PWM(2),
      SENSOR_ATTR_PWM_FREQ(1),
      SENSOR_ATTR_PWM_FREQ_RO(2),
      SENSOR_ATTR_PWM_AUTO_POINT_TEMP(1, 1),
      SENSOR_ATTR_PWM_AUTO_POINT_TEMP(1, 2),
      SENSOR_ATTR_PWM_AUTO_POINT_TEMP(1, 3),
      SENSOR_ATTR_PWM_AUTO_POINT_TEMP(1, 4),
      SENSOR_ATTR_PWM_AUTO_POINT_TEMP_RO(2, 1),
      SENSOR_ATTR_PWM_AUTO_POINT_TEMP_RO(2, 2),
      SENSOR_ATTR_PWM_AUTO_POINT_TEMP_RO(2, 3),
      SENSOR_ATTR_PWM_AUTO_POINT_TEMP_RO(2, 4),
      SENSOR_ATTR_PWM_AUTO_POINT_PWM_RO(1, 1),
      SENSOR_ATTR_PWM_AUTO_POINT_PWM(1, 2),
      SENSOR_ATTR_PWM_AUTO_POINT_PWM(1, 3),
      SENSOR_ATTR_PWM_AUTO_POINT_PWM_RO(1, 4),
      SENSOR_ATTR_PWM_AUTO_POINT_PWM_RO(2, 1),
      SENSOR_ATTR_PWM_AUTO_POINT_PWM(2, 2),
      SENSOR_ATTR_PWM_AUTO_POINT_PWM(2, 3),
      SENSOR_ATTR_PWM_AUTO_POINT_PWM_RO(2, 4),
};

static struct device_attribute vt1211_sysfs_misc[] = {
      __ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm),
      __ATTR(cpu0_vid, S_IRUGO, show_vid, NULL),
      __ATTR(name, S_IRUGO, show_name, NULL),
      __ATTR(alarms, S_IRUGO, show_alarms, NULL),
};

/* ---------------------------------------------------------------------
 * Device registration and initialization
 * --------------------------------------------------------------------- */

static void __devinit vt1211_init_device(struct vt1211_data *data)
{
      /* set VRM */
      data->vrm = vid_which_vrm();

      /* Read (and initialize) UCH config */
      data->uch_config = vt1211_read8(data, VT1211_REG_UCH_CONFIG);
      if (uch_config > -1) {
            data->uch_config = (data->uch_config & 0x83) |
                           (uch_config << 2);
            vt1211_write8(data, VT1211_REG_UCH_CONFIG, data->uch_config);
      }

      /* Initialize the interrupt mode (if request at module load time).
       * The VT1211 implements 3 different modes for clearing interrupts:
       * 0: Clear INT when status register is read. Regenerate INT as long
       *    as temp stays above hysteresis limit.
       * 1: Clear INT when status register is read. DON'T regenerate INT
       *    until temp falls below hysteresis limit and exceeds hot limit
       *    again.
       * 2: Clear INT when temp falls below max limit.
       *
       * The driver only allows to force mode 0 since that's the only one
       * that makes sense for 'sensors' */
      if (int_mode == 0) {
            vt1211_write8(data, VT1211_REG_TEMP1_CONFIG, 0);
            vt1211_write8(data, VT1211_REG_TEMP2_CONFIG, 0);
      }

      /* Fill in some hard wired values into our data struct */
      data->pwm_auto_pwm[0][3] = 255;
      data->pwm_auto_pwm[1][3] = 255;
}

static void vt1211_remove_sysfs(struct platform_device *pdev)
{
      struct device *dev = &pdev->dev;
      int i;

      for (i = 0; i < ARRAY_SIZE(vt1211_sysfs_in_input); i++) {
            device_remove_file(dev,
                  &vt1211_sysfs_in_input[i].dev_attr);
            device_remove_file(dev,
                  &vt1211_sysfs_in_min[i].dev_attr);
            device_remove_file(dev,
                  &vt1211_sysfs_in_max[i].dev_attr);
            device_remove_file(dev,
                  &vt1211_sysfs_in_alarm[i].dev_attr);
      }
      for (i = 0; i < ARRAY_SIZE(vt1211_sysfs_temp_input); i++) {
            device_remove_file(dev,
                  &vt1211_sysfs_temp_input[i].dev_attr);
            device_remove_file(dev,
                  &vt1211_sysfs_temp_max[i].dev_attr);
            device_remove_file(dev,
                  &vt1211_sysfs_temp_max_hyst[i].dev_attr);
            device_remove_file(dev,
                  &vt1211_sysfs_temp_alarm[i].dev_attr);
      }
      for (i = 0; i < ARRAY_SIZE(vt1211_sysfs_fan_pwm); i++) {
            device_remove_file(dev,
                  &vt1211_sysfs_fan_pwm[i].dev_attr);
      }
      for (i = 0; i < ARRAY_SIZE(vt1211_sysfs_misc); i++) {
            device_remove_file(dev, &vt1211_sysfs_misc[i]);
      }
}

static int __devinit vt1211_probe(struct platform_device *pdev)
{
      struct device *dev = &pdev->dev;
      struct vt1211_data *data;
      struct resource *res;
      int i, err;

      if (!(data = kzalloc(sizeof(struct vt1211_data), GFP_KERNEL))) {
            err = -ENOMEM;
            dev_err(dev, "Out of memory\n");
            goto EXIT;
      }

      res = platform_get_resource(pdev, IORESOURCE_IO, 0);
      if (!request_region(res->start, res->end - res->start + 1, DRVNAME)) {
            err = -EBUSY;
            dev_err(dev, "Failed to request region 0x%lx-0x%lx\n",
                  (unsigned long)res->start, (unsigned long)res->end);
            goto EXIT_KFREE;
      }
      data->addr = res->start;
      data->name = DRVNAME;
      mutex_init(&data->update_lock);

      platform_set_drvdata(pdev, data);

      /* Initialize the VT1211 chip */
      vt1211_init_device(data);

      /* Create sysfs interface files */
      for (i = 0; i < ARRAY_SIZE(vt1211_sysfs_in_input); i++) {
            if (ISVOLT(i, data->uch_config)) {
                  if ((err = device_create_file(dev,
                        &vt1211_sysfs_in_input[i].dev_attr)) ||
                      (err = device_create_file(dev,
                        &vt1211_sysfs_in_min[i].dev_attr)) ||
                      (err = device_create_file(dev,
                        &vt1211_sysfs_in_max[i].dev_attr)) ||
                      (err = device_create_file(dev,
                        &vt1211_sysfs_in_alarm[i].dev_attr))) {
                        goto EXIT_DEV_REMOVE;
                  }
            }
      }
      for (i = 0; i < ARRAY_SIZE(vt1211_sysfs_temp_input); i++) {
            if (ISTEMP(i, data->uch_config)) {
                  if ((err = device_create_file(dev,
                        &vt1211_sysfs_temp_input[i].dev_attr)) ||
                      (err = device_create_file(dev,
                        &vt1211_sysfs_temp_max[i].dev_attr)) ||
                      (err = device_create_file(dev,
                        &vt1211_sysfs_temp_max_hyst[i].dev_attr)) ||
                      (err = device_create_file(dev,
                        &vt1211_sysfs_temp_alarm[i].dev_attr))) {
                        goto EXIT_DEV_REMOVE;
                  }
            }
      }
      for (i = 0; i < ARRAY_SIZE(vt1211_sysfs_fan_pwm); i++) {
            err = device_create_file(dev,
                  &vt1211_sysfs_fan_pwm[i].dev_attr);
            if (err) {
                  goto EXIT_DEV_REMOVE;
            }
      }
      for (i = 0; i < ARRAY_SIZE(vt1211_sysfs_misc); i++) {
            err = device_create_file(dev,
                   &vt1211_sysfs_misc[i]);
            if (err) {
                  goto EXIT_DEV_REMOVE;
            }
      }

      /* Register device */
      data->hwmon_dev = hwmon_device_register(dev);
      if (IS_ERR(data->hwmon_dev)) {
            err = PTR_ERR(data->hwmon_dev);
            dev_err(dev, "Class registration failed (%d)\n", err);
            goto EXIT_DEV_REMOVE_SILENT;
      }

      return 0;

EXIT_DEV_REMOVE:
      dev_err(dev, "Sysfs interface creation failed (%d)\n", err);
EXIT_DEV_REMOVE_SILENT:
      vt1211_remove_sysfs(pdev);
      release_region(res->start, res->end - res->start + 1);
EXIT_KFREE:
      platform_set_drvdata(pdev, NULL);
      kfree(data);
EXIT:
      return err;
}

static int __devexit vt1211_remove(struct platform_device *pdev)
{
      struct vt1211_data *data = platform_get_drvdata(pdev);
      struct resource *res;

      hwmon_device_unregister(data->hwmon_dev);
      vt1211_remove_sysfs(pdev);
      platform_set_drvdata(pdev, NULL);
      kfree(data);

      res = platform_get_resource(pdev, IORESOURCE_IO, 0);
      release_region(res->start, res->end - res->start + 1);

      return 0;
}

static struct platform_driver vt1211_driver = {
      .driver = {
            .owner = THIS_MODULE,
            .name  = DRVNAME,
      },
      .probe  = vt1211_probe,
      .remove = __devexit_p(vt1211_remove),
};

static int __init vt1211_device_add(unsigned short address)
{
      struct resource res = {
            .start      = address,
            .end  = address + 0x7f,
            .flags      = IORESOURCE_IO,
      };
      int err;

      pdev = platform_device_alloc(DRVNAME, address);
      if (!pdev) {
            err = -ENOMEM;
            printk(KERN_ERR DRVNAME ": Device allocation failed (%d)\n",
                   err);
            goto EXIT;
      }

      res.name = pdev->name;
      err = platform_device_add_resources(pdev, &res, 1);
      if (err) {
            printk(KERN_ERR DRVNAME ": Device resource addition failed "
                   "(%d)\n", err);
            goto EXIT_DEV_PUT;
      }

      err = platform_device_add(pdev);
      if (err) {
            printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
                   err);
            goto EXIT_DEV_PUT;
      }

      return 0;

EXIT_DEV_PUT:
      platform_device_put(pdev);
EXIT:
      return err;
}

static int __init vt1211_find(int sio_cip, unsigned short *address)
{
      int err = -ENODEV;

      superio_enter(sio_cip);

      if (superio_inb(sio_cip, SIO_VT1211_DEVID) != SIO_VT1211_ID) {
            goto EXIT;
      }

      superio_select(sio_cip, SIO_VT1211_LDN_HWMON);

      if ((superio_inb(sio_cip, SIO_VT1211_ACTIVE) & 1) == 0) {
            printk(KERN_WARNING DRVNAME ": HW monitor is disabled, "
                   "skipping\n");
            goto EXIT;
      }

      *address = ((superio_inb(sio_cip, SIO_VT1211_BADDR) << 8) |
                (superio_inb(sio_cip, SIO_VT1211_BADDR + 1))) & 0xff00;
      if (*address == 0) {
            printk(KERN_WARNING DRVNAME ": Base address is not set, "
                   "skipping\n");
            goto EXIT;
      }

      err = 0;
      printk(KERN_INFO DRVNAME ": Found VT1211 chip at 0x%04x, "
             "revision %u\n", *address,
             superio_inb(sio_cip, SIO_VT1211_DEVREV));

EXIT:
      superio_exit(sio_cip);
      return err;
}

static int __init vt1211_init(void)
{
      int err;
      unsigned short address = 0;

      if ((err = vt1211_find(SIO_REG_CIP1, &address)) &&
          (err = vt1211_find(SIO_REG_CIP2, &address))) {
            goto EXIT;
      }

      if ((uch_config < -1) || (uch_config > 31)) {
            err = -EINVAL;
            printk(KERN_WARNING DRVNAME ": Invalid UCH configuration %d. "
                   "Choose a value between 0 and 31.\n", uch_config);
        goto EXIT;
      }

      if ((int_mode < -1) || (int_mode > 0)) {
            err = -EINVAL;
            printk(KERN_WARNING DRVNAME ": Invalid interrupt mode %d. "
                   "Only mode 0 is supported.\n", int_mode);
        goto EXIT;
      }

      err = platform_driver_register(&vt1211_driver);
      if (err) {
            goto EXIT;
      }

      /* Sets global pdev as a side effect */
      err = vt1211_device_add(address);
      if (err) {
            goto EXIT_DRV_UNREGISTER;
      }

      return 0;

EXIT_DRV_UNREGISTER:
      platform_driver_unregister(&vt1211_driver);
EXIT:
      return err;
}

static void __exit vt1211_exit(void)
{
      platform_device_unregister(pdev);
      platform_driver_unregister(&vt1211_driver);
}

MODULE_AUTHOR("Juerg Haefliger <juergh@gmail.com>");
MODULE_DESCRIPTION("VT1211 sensors");
MODULE_LICENSE("GPL");

module_init(vt1211_init);
module_exit(vt1211_exit);

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