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applesmc.c

/*
 * drivers/hwmon/applesmc.c - driver for Apple's SMC (accelerometer, temperature
 * sensors, fan control, keyboard backlight control) used in Intel-based Apple
 * computers.
 *
 * Copyright (C) 2007 Nicolas Boichat <nicolas@boichat.ch>
 *
 * Based on hdaps.c driver:
 * Copyright (C) 2005 Robert Love <rml@novell.com>
 * Copyright (C) 2005 Jesper Juhl <jesper.juhl@gmail.com>
 *
 * Fan control based on smcFanControl:
 * Copyright (C) 2006 Hendrik Holtmann <holtmann@mac.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License v2 as published by the
 * Free Software Foundation.
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/input-polldev.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/dmi.h>
#include <linux/mutex.h>
#include <linux/hwmon-sysfs.h>
#include <asm/io.h>
#include <linux/leds.h>
#include <linux/hwmon.h>
#include <linux/workqueue.h>

/* data port used by Apple SMC */
#define APPLESMC_DATA_PORT    0x300
/* command/status port used by Apple SMC */
#define APPLESMC_CMD_PORT     0x304

#define APPLESMC_NR_PORTS     32 /* 0x300-0x31f */

#define APPLESMC_MAX_DATA_LENGTH 32

#define APPLESMC_STATUS_MASK  0x0f
#define APPLESMC_READ_CMD     0x10
#define APPLESMC_WRITE_CMD    0x11
#define APPLESMC_GET_KEY_BY_INDEX_CMD     0x12
#define APPLESMC_GET_KEY_TYPE_CMD   0x13

#define KEY_COUNT_KEY         "#KEY" /* r-o ui32 */

#define LIGHT_SENSOR_LEFT_KEY "ALV0" /* r-o {alv (6 bytes) */
#define LIGHT_SENSOR_RIGHT_KEY      "ALV1" /* r-o {alv (6 bytes) */
#define BACKLIGHT_KEY         "LKSB" /* w-o {lkb (2 bytes) */

#define CLAMSHELL_KEY         "MSLD" /* r-o ui8 (unused) */

#define MOTION_SENSOR_X_KEY   "MO_X" /* r-o sp78 (2 bytes) */
#define MOTION_SENSOR_Y_KEY   "MO_Y" /* r-o sp78 (2 bytes) */
#define MOTION_SENSOR_Z_KEY   "MO_Z" /* r-o sp78 (2 bytes) */
#define MOTION_SENSOR_KEY     "MOCN" /* r/w ui16 */

#define FANS_COUNT            "FNum" /* r-o ui8 */
#define FANS_MANUAL           "FS! " /* r-w ui16 */
#define FAN_ACTUAL_SPEED      "F0Ac" /* r-o fpe2 (2 bytes) */
#define FAN_MIN_SPEED         "F0Mn" /* r-o fpe2 (2 bytes) */
#define FAN_MAX_SPEED         "F0Mx" /* r-o fpe2 (2 bytes) */
#define FAN_SAFE_SPEED        "F0Sf" /* r-o fpe2 (2 bytes) */
#define FAN_TARGET_SPEED      "F0Tg" /* r-w fpe2 (2 bytes) */
#define FAN_POSITION          "F0ID" /* r-o char[16] */

/*
 * Temperature sensors keys (sp78 - 2 bytes).
 */
static const char* temperature_sensors_sets[][36] = {
/* Set 0: Macbook Pro */
      { "TA0P", "TB0T", "TC0D", "TC0P", "TG0H", "TG0P", "TG0T", "Th0H",
        "Th1H", "Tm0P", "Ts0P", "Ts1P", NULL },
/* Set 1: Macbook set */
      { "TB0T", "TC0D", "TC0P", "TM0P", "TN0P", "TN1P", "Th0H", "Th0S",
        "Th1H", "Ts0P", NULL },
/* Set 2: Macmini set */
      { "TC0D", "TC0P", NULL },
/* Set 3: Mac Pro (2 x Quad-Core) */
      { "TA0P", "TCAG", "TCAH", "TCBG", "TCBH", "TC0C", "TC0D", "TC0P",
        "TC1C", "TC1D", "TC2C", "TC2D", "TC3C", "TC3D", "THTG", "TH0P",
        "TH1P", "TH2P", "TH3P", "TMAP", "TMAS", "TMBS", "TM0P", "TM0S",
        "TM1P", "TM1S", "TM2P", "TM2S", "TM3S", "TM8P", "TM8S", "TM9P",
        "TM9S", "TN0H", "TS0C", NULL },
};

/* List of keys used to read/write fan speeds */
static const char* fan_speed_keys[] = {
      FAN_ACTUAL_SPEED,
      FAN_MIN_SPEED,
      FAN_MAX_SPEED,
      FAN_SAFE_SPEED,
      FAN_TARGET_SPEED
};

#define INIT_TIMEOUT_MSECS    5000  /* wait up to 5s for device init ... */
#define INIT_WAIT_MSECS       50    /* ... in 50ms increments */

#define APPLESMC_POLL_INTERVAL      50    /* msecs */
#define APPLESMC_INPUT_FUZZ   4     /* input event threshold */
#define APPLESMC_INPUT_FLAT   4

#define SENSOR_X 0
#define SENSOR_Y 1
#define SENSOR_Z 2

/* Structure to be passed to DMI_MATCH function */
struct dmi_match_data {
/* Indicates whether this computer has an accelerometer. */
      int accelerometer;
/* Indicates whether this computer has light sensors and keyboard backlight. */
      int light;
/* Indicates which temperature sensors set to use. */
      int temperature_set;
};

static const int debug;
static struct platform_device *pdev;
static s16 rest_x;
static s16 rest_y;
static struct device *hwmon_dev;
static struct input_polled_dev *applesmc_idev;

/* Indicates whether this computer has an accelerometer. */
static unsigned int applesmc_accelerometer;

/* Indicates whether this computer has light sensors and keyboard backlight. */
static unsigned int applesmc_light;

/* Indicates which temperature sensors set to use. */
static unsigned int applesmc_temperature_set;

static DEFINE_MUTEX(applesmc_lock);

/*
 * Last index written to key_at_index sysfs file, and value to use for all other
 * key_at_index_* sysfs files.
 */
static unsigned int key_at_index;

static struct workqueue_struct *applesmc_led_wq;

/*
 * __wait_status - Wait up to 2ms for the status port to get a certain value
 * (masked with 0x0f), returning zero if the value is obtained.  Callers must
 * hold applesmc_lock.
 */
static int __wait_status(u8 val)
{
      unsigned int i;

      val = val & APPLESMC_STATUS_MASK;

      for (i = 0; i < 200; i++) {
            if ((inb(APPLESMC_CMD_PORT) & APPLESMC_STATUS_MASK) == val) {
                  if (debug)
                        printk(KERN_DEBUG
                                    "Waited %d us for status %x\n",
                                    i*10, val);
                  return 0;
            }
            udelay(10);
      }

      printk(KERN_WARNING "applesmc: wait status failed: %x != %x\n",
                                    val, inb(APPLESMC_CMD_PORT));

      return -EIO;
}

/*
 * applesmc_read_key - reads len bytes from a given key, and put them in buffer.
 * Returns zero on success or a negative error on failure. Callers must
 * hold applesmc_lock.
 */
static int applesmc_read_key(const char* key, u8* buffer, u8 len)
{
      int i;

      if (len > APPLESMC_MAX_DATA_LENGTH) {
            printk(KERN_ERR   "applesmc_read_key: cannot read more than "
                              "%d bytes\n", APPLESMC_MAX_DATA_LENGTH);
            return -EINVAL;
      }

      outb(APPLESMC_READ_CMD, APPLESMC_CMD_PORT);
      if (__wait_status(0x0c))
            return -EIO;

      for (i = 0; i < 4; i++) {
            outb(key[i], APPLESMC_DATA_PORT);
            if (__wait_status(0x04))
                  return -EIO;
      }
      if (debug)
            printk(KERN_DEBUG "<%s", key);

      outb(len, APPLESMC_DATA_PORT);
      if (debug)
            printk(KERN_DEBUG ">%x", len);

      for (i = 0; i < len; i++) {
            if (__wait_status(0x05))
                  return -EIO;
            buffer[i] = inb(APPLESMC_DATA_PORT);
            if (debug)
                  printk(KERN_DEBUG "<%x", buffer[i]);
      }
      if (debug)
            printk(KERN_DEBUG "\n");

      return 0;
}

/*
 * applesmc_write_key - writes len bytes from buffer to a given key.
 * Returns zero on success or a negative error on failure. Callers must
 * hold applesmc_lock.
 */
static int applesmc_write_key(const char* key, u8* buffer, u8 len)
{
      int i;

      if (len > APPLESMC_MAX_DATA_LENGTH) {
            printk(KERN_ERR   "applesmc_write_key: cannot write more than "
                              "%d bytes\n", APPLESMC_MAX_DATA_LENGTH);
            return -EINVAL;
      }

      outb(APPLESMC_WRITE_CMD, APPLESMC_CMD_PORT);
      if (__wait_status(0x0c))
            return -EIO;

      for (i = 0; i < 4; i++) {
            outb(key[i], APPLESMC_DATA_PORT);
            if (__wait_status(0x04))
                  return -EIO;
      }

      outb(len, APPLESMC_DATA_PORT);

      for (i = 0; i < len; i++) {
            if (__wait_status(0x04))
                  return -EIO;
            outb(buffer[i], APPLESMC_DATA_PORT);
      }

      return 0;
}

/*
 * applesmc_get_key_at_index - get key at index, and put the result in key
 * (char[6]). Returns zero on success or a negative error on failure. Callers
 * must hold applesmc_lock.
 */
static int applesmc_get_key_at_index(int index, char* key)
{
      int i;
      u8 readkey[4];
      readkey[0] = index >> 24;
      readkey[1] = index >> 16;
      readkey[2] = index >> 8;
      readkey[3] = index;

      outb(APPLESMC_GET_KEY_BY_INDEX_CMD, APPLESMC_CMD_PORT);
      if (__wait_status(0x0c))
            return -EIO;

      for (i = 0; i < 4; i++) {
            outb(readkey[i], APPLESMC_DATA_PORT);
            if (__wait_status(0x04))
                  return -EIO;
      }

      outb(4, APPLESMC_DATA_PORT);

      for (i = 0; i < 4; i++) {
            if (__wait_status(0x05))
                  return -EIO;
            key[i] = inb(APPLESMC_DATA_PORT);
      }
      key[4] = 0;

      return 0;
}

/*
 * applesmc_get_key_type - get key type, and put the result in type (char[6]).
 * Returns zero on success or a negative error on failure. Callers must
 * hold applesmc_lock.
 */
static int applesmc_get_key_type(char* key, char* type)
{
      int i;

      outb(APPLESMC_GET_KEY_TYPE_CMD, APPLESMC_CMD_PORT);
      if (__wait_status(0x0c))
            return -EIO;

      for (i = 0; i < 4; i++) {
            outb(key[i], APPLESMC_DATA_PORT);
            if (__wait_status(0x04))
                  return -EIO;
      }

      outb(5, APPLESMC_DATA_PORT);

      for (i = 0; i < 6; i++) {
            if (__wait_status(0x05))
                  return -EIO;
            type[i] = inb(APPLESMC_DATA_PORT);
      }
      type[5] = 0;

      return 0;
}

/*
 * applesmc_read_motion_sensor - Read motion sensor (X, Y or Z). Callers must
 * hold applesmc_lock.
 */
static int applesmc_read_motion_sensor(int index, s16* value)
{
      u8 buffer[2];
      int ret;

      switch (index) {
      case SENSOR_X:
            ret = applesmc_read_key(MOTION_SENSOR_X_KEY, buffer, 2);
            break;
      case SENSOR_Y:
            ret = applesmc_read_key(MOTION_SENSOR_Y_KEY, buffer, 2);
            break;
      case SENSOR_Z:
            ret = applesmc_read_key(MOTION_SENSOR_Z_KEY, buffer, 2);
            break;
      default:
            ret = -EINVAL;
      }

      *value = ((s16)buffer[0] << 8) | buffer[1];

      return ret;
}

/*
 * applesmc_device_init - initialize the accelerometer.  Returns zero on success
 * and negative error code on failure.  Can sleep.
 */
static int applesmc_device_init(void)
{
      int total, ret = -ENXIO;
      u8 buffer[2];

      if (!applesmc_accelerometer)
            return 0;

      mutex_lock(&applesmc_lock);

      for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
            if (debug)
                  printk(KERN_DEBUG "applesmc try %d\n", total);
            if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
                        (buffer[0] != 0x00 || buffer[1] != 0x00)) {
                  if (total == INIT_TIMEOUT_MSECS) {
                        printk(KERN_DEBUG "applesmc: device has"
                                    " already been initialized"
                                    " (0x%02x, 0x%02x).\n",
                                    buffer[0], buffer[1]);
                  } else {
                        printk(KERN_DEBUG "applesmc: device"
                                    " successfully initialized"
                                    " (0x%02x, 0x%02x).\n",
                                    buffer[0], buffer[1]);
                  }
                  ret = 0;
                  goto out;
            }
            buffer[0] = 0xe0;
            buffer[1] = 0x00;
            applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
            msleep(INIT_WAIT_MSECS);
      }

      printk(KERN_WARNING "applesmc: failed to init the device\n");

out:
      mutex_unlock(&applesmc_lock);
      return ret;
}

/*
 * applesmc_get_fan_count - get the number of fans. Callers must NOT hold
 * applesmc_lock.
 */
static int applesmc_get_fan_count(void)
{
      int ret;
      u8 buffer[1];

      mutex_lock(&applesmc_lock);

      ret = applesmc_read_key(FANS_COUNT, buffer, 1);

      mutex_unlock(&applesmc_lock);
      if (ret)
            return ret;
      else
            return buffer[0];
}

/* Device model stuff */
static int applesmc_probe(struct platform_device *dev)
{
      int ret;

      ret = applesmc_device_init();
      if (ret)
            return ret;

      printk(KERN_INFO "applesmc: device successfully initialized.\n");
      return 0;
}

static int applesmc_resume(struct platform_device *dev)
{
      return applesmc_device_init();
}

static struct platform_driver applesmc_driver = {
      .probe = applesmc_probe,
      .resume = applesmc_resume,
      .driver     = {
            .name = "applesmc",
            .owner = THIS_MODULE,
      },
};

/*
 * applesmc_calibrate - Set our "resting" values.  Callers must
 * hold applesmc_lock.
 */
static void applesmc_calibrate(void)
{
      applesmc_read_motion_sensor(SENSOR_X, &rest_x);
      applesmc_read_motion_sensor(SENSOR_Y, &rest_y);
      rest_x = -rest_x;
}

static void applesmc_idev_poll(struct input_polled_dev *dev)
{
      struct input_dev *idev = dev->input;
      s16 x, y;

      mutex_lock(&applesmc_lock);

      if (applesmc_read_motion_sensor(SENSOR_X, &x))
            goto out;
      if (applesmc_read_motion_sensor(SENSOR_Y, &y))
            goto out;

      x = -x;
      input_report_abs(idev, ABS_X, x - rest_x);
      input_report_abs(idev, ABS_Y, y - rest_y);
      input_sync(idev);

out:
      mutex_unlock(&applesmc_lock);
}

/* Sysfs Files */

static ssize_t applesmc_name_show(struct device *dev,
                           struct device_attribute *attr, char *buf)
{
      return snprintf(buf, PAGE_SIZE, "applesmc\n");
}

static ssize_t applesmc_position_show(struct device *dev,
                           struct device_attribute *attr, char *buf)
{
      int ret;
      s16 x, y, z;

      mutex_lock(&applesmc_lock);

      ret = applesmc_read_motion_sensor(SENSOR_X, &x);
      if (ret)
            goto out;
      ret = applesmc_read_motion_sensor(SENSOR_Y, &y);
      if (ret)
            goto out;
      ret = applesmc_read_motion_sensor(SENSOR_Z, &z);
      if (ret)
            goto out;

out:
      mutex_unlock(&applesmc_lock);
      if (ret)
            return ret;
      else
            return snprintf(buf, PAGE_SIZE, "(%d,%d,%d)\n", x, y, z);
}

static ssize_t applesmc_light_show(struct device *dev,
                        struct device_attribute *attr, char *sysfsbuf)
{
      int ret;
      u8 left = 0, right = 0;
      u8 buffer[6];

      mutex_lock(&applesmc_lock);

      ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, 6);
      left = buffer[2];
      if (ret)
            goto out;
      ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, 6);
      right = buffer[2];

out:
      mutex_unlock(&applesmc_lock);
      if (ret)
            return ret;
      else
            return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", left, right);
}

/* Displays degree Celsius * 1000 */
static ssize_t applesmc_show_temperature(struct device *dev,
                  struct device_attribute *devattr, char *sysfsbuf)
{
      int ret;
      u8 buffer[2];
      unsigned int temp;
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
      const char* key =
            temperature_sensors_sets[applesmc_temperature_set][attr->index];

      mutex_lock(&applesmc_lock);

      ret = applesmc_read_key(key, buffer, 2);
      temp = buffer[0]*1000;
      temp += (buffer[1] >> 6) * 250;

      mutex_unlock(&applesmc_lock);

      if (ret)
            return ret;
      else
            return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", temp);
}

static ssize_t applesmc_show_fan_speed(struct device *dev,
                        struct device_attribute *attr, char *sysfsbuf)
{
      int ret;
      unsigned int speed = 0;
      char newkey[5];
      u8 buffer[2];
      struct sensor_device_attribute_2 *sensor_attr =
                                    to_sensor_dev_attr_2(attr);

      newkey[0] = fan_speed_keys[sensor_attr->nr][0];
      newkey[1] = '0' + sensor_attr->index;
      newkey[2] = fan_speed_keys[sensor_attr->nr][2];
      newkey[3] = fan_speed_keys[sensor_attr->nr][3];
      newkey[4] = 0;

      mutex_lock(&applesmc_lock);

      ret = applesmc_read_key(newkey, buffer, 2);
      speed = ((buffer[0] << 8 | buffer[1]) >> 2);

      mutex_unlock(&applesmc_lock);
      if (ret)
            return ret;
      else
            return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", speed);
}

static ssize_t applesmc_store_fan_speed(struct device *dev,
                              struct device_attribute *attr,
                              const char *sysfsbuf, size_t count)
{
      int ret;
      u32 speed;
      char newkey[5];
      u8 buffer[2];
      struct sensor_device_attribute_2 *sensor_attr =
                                    to_sensor_dev_attr_2(attr);

      speed = simple_strtoul(sysfsbuf, NULL, 10);

      if (speed > 0x4000) /* Bigger than a 14-bit value */
            return -EINVAL;

      newkey[0] = fan_speed_keys[sensor_attr->nr][0];
      newkey[1] = '0' + sensor_attr->index;
      newkey[2] = fan_speed_keys[sensor_attr->nr][2];
      newkey[3] = fan_speed_keys[sensor_attr->nr][3];
      newkey[4] = 0;

      mutex_lock(&applesmc_lock);

      buffer[0] = (speed >> 6) & 0xff;
      buffer[1] = (speed << 2) & 0xff;
      ret = applesmc_write_key(newkey, buffer, 2);

      mutex_unlock(&applesmc_lock);
      if (ret)
            return ret;
      else
            return count;
}

static ssize_t applesmc_show_fan_manual(struct device *dev,
                  struct device_attribute *devattr, char *sysfsbuf)
{
      int ret;
      u16 manual = 0;
      u8 buffer[2];
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

      mutex_lock(&applesmc_lock);

      ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
      manual = ((buffer[0] << 8 | buffer[1]) >> attr->index) & 0x01;

      mutex_unlock(&applesmc_lock);
      if (ret)
            return ret;
      else
            return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", manual);
}

static ssize_t applesmc_store_fan_manual(struct device *dev,
                               struct device_attribute *devattr,
                               const char *sysfsbuf, size_t count)
{
      int ret;
      u8 buffer[2];
      u32 input;
      u16 val;
      struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

      input = simple_strtoul(sysfsbuf, NULL, 10);

      mutex_lock(&applesmc_lock);

      ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
      val = (buffer[0] << 8 | buffer[1]);
      if (ret)
            goto out;

      if (input)
            val = val | (0x01 << attr->index);
      else
            val = val & ~(0x01 << attr->index);

      buffer[0] = (val >> 8) & 0xFF;
      buffer[1] = val & 0xFF;

      ret = applesmc_write_key(FANS_MANUAL, buffer, 2);

out:
      mutex_unlock(&applesmc_lock);
      if (ret)
            return ret;
      else
            return count;
}

static ssize_t applesmc_show_fan_position(struct device *dev,
                        struct device_attribute *attr, char *sysfsbuf)
{
      int ret;
      char newkey[5];
      u8 buffer[17];
      struct sensor_device_attribute_2 *sensor_attr =
                                    to_sensor_dev_attr_2(attr);

      newkey[0] = FAN_POSITION[0];
      newkey[1] = '0' + sensor_attr->index;
      newkey[2] = FAN_POSITION[2];
      newkey[3] = FAN_POSITION[3];
      newkey[4] = 0;

      mutex_lock(&applesmc_lock);

      ret = applesmc_read_key(newkey, buffer, 16);
      buffer[16] = 0;

      mutex_unlock(&applesmc_lock);
      if (ret)
            return ret;
      else
            return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", buffer+4);
}

static ssize_t applesmc_calibrate_show(struct device *dev,
                        struct device_attribute *attr, char *sysfsbuf)
{
      return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", rest_x, rest_y);
}

static ssize_t applesmc_calibrate_store(struct device *dev,
      struct device_attribute *attr, const char *sysfsbuf, size_t count)
{
      mutex_lock(&applesmc_lock);
      applesmc_calibrate();
      mutex_unlock(&applesmc_lock);

      return count;
}

/* Store the next backlight value to be written by the work */
static unsigned int backlight_value;

static void applesmc_backlight_set(struct work_struct *work)
{
      u8 buffer[2];

      mutex_lock(&applesmc_lock);
      buffer[0] = backlight_value;
      buffer[1] = 0x00;
      applesmc_write_key(BACKLIGHT_KEY, buffer, 2);
      mutex_unlock(&applesmc_lock);
}
static DECLARE_WORK(backlight_work, &applesmc_backlight_set);

static void applesmc_brightness_set(struct led_classdev *led_cdev,
                                    enum led_brightness value)
{
      int ret;

      backlight_value = value;
      ret = queue_work(applesmc_led_wq, &backlight_work);

      if (debug && (!ret))
            printk(KERN_DEBUG "applesmc: work was already on the queue.\n");
}

static ssize_t applesmc_key_count_show(struct device *dev,
                        struct device_attribute *attr, char *sysfsbuf)
{
      int ret;
      u8 buffer[4];
      u32 count;

      mutex_lock(&applesmc_lock);

      ret = applesmc_read_key(KEY_COUNT_KEY, buffer, 4);
      count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) +
                                    ((u32)buffer[2]<<8) + buffer[3];

      mutex_unlock(&applesmc_lock);
      if (ret)
            return ret;
      else
            return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", count);
}

static ssize_t applesmc_key_at_index_read_show(struct device *dev,
                        struct device_attribute *attr, char *sysfsbuf)
{
      char key[5];
      char info[6];
      int ret;

      mutex_lock(&applesmc_lock);

      ret = applesmc_get_key_at_index(key_at_index, key);

      if (ret || !key[0]) {
            mutex_unlock(&applesmc_lock);

            return -EINVAL;
      }

      ret = applesmc_get_key_type(key, info);

      if (ret) {
            mutex_unlock(&applesmc_lock);

            return ret;
      }

      /*
       * info[0] maximum value (APPLESMC_MAX_DATA_LENGTH) is much lower than
       * PAGE_SIZE, so we don't need any checks before writing to sysfsbuf.
       */
      ret = applesmc_read_key(key, sysfsbuf, info[0]);

      mutex_unlock(&applesmc_lock);

      if (!ret) {
            return info[0];
      } else {
            return ret;
      }
}

static ssize_t applesmc_key_at_index_data_length_show(struct device *dev,
                        struct device_attribute *attr, char *sysfsbuf)
{
      char key[5];
      char info[6];
      int ret;

      mutex_lock(&applesmc_lock);

      ret = applesmc_get_key_at_index(key_at_index, key);

      if (ret || !key[0]) {
            mutex_unlock(&applesmc_lock);

            return -EINVAL;
      }

      ret = applesmc_get_key_type(key, info);

      mutex_unlock(&applesmc_lock);

      if (!ret)
            return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", info[0]);
      else
            return ret;
}

static ssize_t applesmc_key_at_index_type_show(struct device *dev,
                        struct device_attribute *attr, char *sysfsbuf)
{
      char key[5];
      char info[6];
      int ret;

      mutex_lock(&applesmc_lock);

      ret = applesmc_get_key_at_index(key_at_index, key);

      if (ret || !key[0]) {
            mutex_unlock(&applesmc_lock);

            return -EINVAL;
      }

      ret = applesmc_get_key_type(key, info);

      mutex_unlock(&applesmc_lock);

      if (!ret)
            return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", info+1);
      else
            return ret;
}

static ssize_t applesmc_key_at_index_name_show(struct device *dev,
                        struct device_attribute *attr, char *sysfsbuf)
{
      char key[5];
      int ret;

      mutex_lock(&applesmc_lock);

      ret = applesmc_get_key_at_index(key_at_index, key);

      mutex_unlock(&applesmc_lock);

      if (!ret && key[0])
            return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", key);
      else
            return -EINVAL;
}

static ssize_t applesmc_key_at_index_show(struct device *dev,
                        struct device_attribute *attr, char *sysfsbuf)
{
      return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", key_at_index);
}

static ssize_t applesmc_key_at_index_store(struct device *dev,
      struct device_attribute *attr, const char *sysfsbuf, size_t count)
{
      mutex_lock(&applesmc_lock);

      key_at_index = simple_strtoul(sysfsbuf, NULL, 10);

      mutex_unlock(&applesmc_lock);

      return count;
}

static struct led_classdev applesmc_backlight = {
      .name             = "smc:kbd_backlight",
      .default_trigger  = "nand-disk",
      .brightness_set         = applesmc_brightness_set,
};

static DEVICE_ATTR(name, 0444, applesmc_name_show, NULL);

static DEVICE_ATTR(position, 0444, applesmc_position_show, NULL);
static DEVICE_ATTR(calibrate, 0644,
                  applesmc_calibrate_show, applesmc_calibrate_store);

static struct attribute *accelerometer_attributes[] = {
      &dev_attr_position.attr,
      &dev_attr_calibrate.attr,
      NULL
};

static const struct attribute_group accelerometer_attributes_group =
      { .attrs = accelerometer_attributes };

static DEVICE_ATTR(light, 0444, applesmc_light_show, NULL);

static DEVICE_ATTR(key_count, 0444, applesmc_key_count_show, NULL);
static DEVICE_ATTR(key_at_index, 0644,
            applesmc_key_at_index_show, applesmc_key_at_index_store);
static DEVICE_ATTR(key_at_index_name, 0444,
                              applesmc_key_at_index_name_show, NULL);
static DEVICE_ATTR(key_at_index_type, 0444,
                              applesmc_key_at_index_type_show, NULL);
static DEVICE_ATTR(key_at_index_data_length, 0444,
                        applesmc_key_at_index_data_length_show, NULL);
static DEVICE_ATTR(key_at_index_data, 0444,
                        applesmc_key_at_index_read_show, NULL);

static struct attribute *key_enumeration_attributes[] = {
      &dev_attr_key_count.attr,
      &dev_attr_key_at_index.attr,
      &dev_attr_key_at_index_name.attr,
      &dev_attr_key_at_index_type.attr,
      &dev_attr_key_at_index_data_length.attr,
      &dev_attr_key_at_index_data.attr,
      NULL
};

static const struct attribute_group key_enumeration_group =
      { .attrs = key_enumeration_attributes };

/*
 * Macro defining SENSOR_DEVICE_ATTR for a fan sysfs entries.
 *  - show actual speed
 *  - show/store minimum speed
 *  - show maximum speed
 *  - show safe speed
 *  - show/store target speed
 *  - show/store manual mode
 */
#define sysfs_fan_speeds_offset(offset) \
static SENSOR_DEVICE_ATTR_2(fan##offset##_input, S_IRUGO, \
                  applesmc_show_fan_speed, NULL, 0, offset-1); \
\
static SENSOR_DEVICE_ATTR_2(fan##offset##_min, S_IRUGO | S_IWUSR, \
      applesmc_show_fan_speed, applesmc_store_fan_speed, 1, offset-1); \
\
static SENSOR_DEVICE_ATTR_2(fan##offset##_max, S_IRUGO, \
                  applesmc_show_fan_speed, NULL, 2, offset-1); \
\
static SENSOR_DEVICE_ATTR_2(fan##offset##_safe, S_IRUGO, \
                  applesmc_show_fan_speed, NULL, 3, offset-1); \
\
static SENSOR_DEVICE_ATTR_2(fan##offset##_output, S_IRUGO | S_IWUSR, \
      applesmc_show_fan_speed, applesmc_store_fan_speed, 4, offset-1); \
\
static SENSOR_DEVICE_ATTR(fan##offset##_manual, S_IRUGO | S_IWUSR, \
      applesmc_show_fan_manual, applesmc_store_fan_manual, offset-1); \
\
static SENSOR_DEVICE_ATTR(fan##offset##_label, S_IRUGO, \
      applesmc_show_fan_position, NULL, offset-1); \
\
static struct attribute *fan##offset##_attributes[] = { \
      &sensor_dev_attr_fan##offset##_input.dev_attr.attr, \
      &sensor_dev_attr_fan##offset##_min.dev_attr.attr, \
      &sensor_dev_attr_fan##offset##_max.dev_attr.attr, \
      &sensor_dev_attr_fan##offset##_safe.dev_attr.attr, \
      &sensor_dev_attr_fan##offset##_output.dev_attr.attr, \
      &sensor_dev_attr_fan##offset##_manual.dev_attr.attr, \
      &sensor_dev_attr_fan##offset##_label.dev_attr.attr, \
      NULL \
};

/*
 * Create the needed functions for each fan using the macro defined above
 * (4 fans are supported)
 */
sysfs_fan_speeds_offset(1);
sysfs_fan_speeds_offset(2);
sysfs_fan_speeds_offset(3);
sysfs_fan_speeds_offset(4);

static const struct attribute_group fan_attribute_groups[] = {
      { .attrs = fan1_attributes },
      { .attrs = fan2_attributes },
      { .attrs = fan3_attributes },
      { .attrs = fan4_attributes },
};

/*
 * Temperature sensors sysfs entries.
 */
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 3);
static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 4);
static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 5);
static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 6);
static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 7);
static SENSOR_DEVICE_ATTR(temp9_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 8);
static SENSOR_DEVICE_ATTR(temp10_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 9);
static SENSOR_DEVICE_ATTR(temp11_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 10);
static SENSOR_DEVICE_ATTR(temp12_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 11);
static SENSOR_DEVICE_ATTR(temp13_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 12);
static SENSOR_DEVICE_ATTR(temp14_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 13);
static SENSOR_DEVICE_ATTR(temp15_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 14);
static SENSOR_DEVICE_ATTR(temp16_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 15);
static SENSOR_DEVICE_ATTR(temp17_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 16);
static SENSOR_DEVICE_ATTR(temp18_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 17);
static SENSOR_DEVICE_ATTR(temp19_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 18);
static SENSOR_DEVICE_ATTR(temp20_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 19);
static SENSOR_DEVICE_ATTR(temp21_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 20);
static SENSOR_DEVICE_ATTR(temp22_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 21);
static SENSOR_DEVICE_ATTR(temp23_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 22);
static SENSOR_DEVICE_ATTR(temp24_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 23);
static SENSOR_DEVICE_ATTR(temp25_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 24);
static SENSOR_DEVICE_ATTR(temp26_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 25);
static SENSOR_DEVICE_ATTR(temp27_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 26);
static SENSOR_DEVICE_ATTR(temp28_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 27);
static SENSOR_DEVICE_ATTR(temp29_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 28);
static SENSOR_DEVICE_ATTR(temp30_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 29);
static SENSOR_DEVICE_ATTR(temp31_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 30);
static SENSOR_DEVICE_ATTR(temp32_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 31);
static SENSOR_DEVICE_ATTR(temp33_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 32);
static SENSOR_DEVICE_ATTR(temp34_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 33);
static SENSOR_DEVICE_ATTR(temp35_input, S_IRUGO,
                              applesmc_show_temperature, NULL, 34);

static struct attribute *temperature_attributes[] = {
      &sensor_dev_attr_temp1_input.dev_attr.attr,
      &sensor_dev_attr_temp2_input.dev_attr.attr,
      &sensor_dev_attr_temp3_input.dev_attr.attr,
      &sensor_dev_attr_temp4_input.dev_attr.attr,
      &sensor_dev_attr_temp5_input.dev_attr.attr,
      &sensor_dev_attr_temp6_input.dev_attr.attr,
      &sensor_dev_attr_temp7_input.dev_attr.attr,
      &sensor_dev_attr_temp8_input.dev_attr.attr,
      &sensor_dev_attr_temp9_input.dev_attr.attr,
      &sensor_dev_attr_temp10_input.dev_attr.attr,
      &sensor_dev_attr_temp11_input.dev_attr.attr,
      &sensor_dev_attr_temp12_input.dev_attr.attr,
      &sensor_dev_attr_temp13_input.dev_attr.attr,
      &sensor_dev_attr_temp14_input.dev_attr.attr,
      &sensor_dev_attr_temp15_input.dev_attr.attr,
      &sensor_dev_attr_temp16_input.dev_attr.attr,
      &sensor_dev_attr_temp17_input.dev_attr.attr,
      &sensor_dev_attr_temp18_input.dev_attr.attr,
      &sensor_dev_attr_temp19_input.dev_attr.attr,
      &sensor_dev_attr_temp20_input.dev_attr.attr,
      &sensor_dev_attr_temp21_input.dev_attr.attr,
      &sensor_dev_attr_temp22_input.dev_attr.attr,
      &sensor_dev_attr_temp23_input.dev_attr.attr,
      &sensor_dev_attr_temp24_input.dev_attr.attr,
      &sensor_dev_attr_temp25_input.dev_attr.attr,
      &sensor_dev_attr_temp26_input.dev_attr.attr,
      &sensor_dev_attr_temp27_input.dev_attr.attr,
      &sensor_dev_attr_temp28_input.dev_attr.attr,
      &sensor_dev_attr_temp29_input.dev_attr.attr,
      &sensor_dev_attr_temp30_input.dev_attr.attr,
      &sensor_dev_attr_temp31_input.dev_attr.attr,
      &sensor_dev_attr_temp32_input.dev_attr.attr,
      &sensor_dev_attr_temp33_input.dev_attr.attr,
      &sensor_dev_attr_temp34_input.dev_attr.attr,
      &sensor_dev_attr_temp35_input.dev_attr.attr,
      NULL
};

static const struct attribute_group temperature_attributes_group =
      { .attrs = temperature_attributes };

/* Module stuff */

/*
 * applesmc_dmi_match - found a match.  return one, short-circuiting the hunt.
 */
static int applesmc_dmi_match(const struct dmi_system_id *id)
{
      int i = 0;
      struct dmi_match_data* dmi_data = id->driver_data;
      printk(KERN_INFO "applesmc: %s detected:\n", id->ident);
      applesmc_accelerometer = dmi_data->accelerometer;
      printk(KERN_INFO "applesmc:  - Model %s accelerometer\n",
                        applesmc_accelerometer ? "with" : "without");
      applesmc_light = dmi_data->light;
      printk(KERN_INFO "applesmc:  - Model %s light sensors and backlight\n",
                              applesmc_light ? "with" : "without");

      applesmc_temperature_set =  dmi_data->temperature_set;
      while (temperature_sensors_sets[applesmc_temperature_set][i] != NULL)
            i++;
      printk(KERN_INFO "applesmc:  - Model with %d temperature sensors\n", i);
      return 1;
}

/* Create accelerometer ressources */
static int applesmc_create_accelerometer(void)
{
      struct input_dev *idev;
      int ret;

      ret = sysfs_create_group(&pdev->dev.kobj,
                              &accelerometer_attributes_group);
      if (ret)
            goto out;

      applesmc_idev = input_allocate_polled_device();
      if (!applesmc_idev) {
            ret = -ENOMEM;
            goto out_sysfs;
      }

      applesmc_idev->poll = applesmc_idev_poll;
      applesmc_idev->poll_interval = APPLESMC_POLL_INTERVAL;

      /* initial calibrate for the input device */
      applesmc_calibrate();

      /* initialize the input device */
      idev = applesmc_idev->input;
      idev->name = "applesmc";
      idev->id.bustype = BUS_HOST;
      idev->dev.parent = &pdev->dev;
      idev->evbit[0] = BIT_MASK(EV_ABS);
      input_set_abs_params(idev, ABS_X,
                  -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
      input_set_abs_params(idev, ABS_Y,
                  -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);

      ret = input_register_polled_device(applesmc_idev);
      if (ret)
            goto out_idev;

      return 0;

out_idev:
      input_free_polled_device(applesmc_idev);

out_sysfs:
      sysfs_remove_group(&pdev->dev.kobj, &accelerometer_attributes_group);

out:
      printk(KERN_WARNING "applesmc: driver init failed (ret=%d)!\n", ret);
      return ret;
}

/* Release all ressources used by the accelerometer */
static void applesmc_release_accelerometer(void)
{
      input_unregister_polled_device(applesmc_idev);
      input_free_polled_device(applesmc_idev);
      sysfs_remove_group(&pdev->dev.kobj, &accelerometer_attributes_group);
}

static __initdata struct dmi_match_data applesmc_dmi_data[] = {
/* MacBook Pro: accelerometer, backlight and temperature set 0 */
      { .accelerometer = 1, .light = 1, .temperature_set = 0 },
/* MacBook: accelerometer and temperature set 1 */
      { .accelerometer = 1, .light = 0, .temperature_set = 1 },
/* MacMini: temperature set 2 */
      { .accelerometer = 0, .light = 0, .temperature_set = 2 },
/* MacPro: temperature set 3 */
      { .accelerometer = 0, .light = 0, .temperature_set = 3 },
};

/* Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1".
 * So we need to put "Apple MacBook Pro" before "Apple MacBook". */
static __initdata struct dmi_system_id applesmc_whitelist[] = {
      { applesmc_dmi_match, "Apple MacBook Pro", {
        DMI_MATCH(DMI_BOARD_VENDOR,"Apple"),
        DMI_MATCH(DMI_PRODUCT_NAME,"MacBookPro") },
            (void*)&applesmc_dmi_data[0]},
      { applesmc_dmi_match, "Apple MacBook", {
        DMI_MATCH(DMI_BOARD_VENDOR,"Apple"),
        DMI_MATCH(DMI_PRODUCT_NAME,"MacBook") },
            (void*)&applesmc_dmi_data[1]},
      { applesmc_dmi_match, "Apple Macmini", {
        DMI_MATCH(DMI_BOARD_VENDOR,"Apple"),
        DMI_MATCH(DMI_PRODUCT_NAME,"Macmini") },
            (void*)&applesmc_dmi_data[2]},
      { applesmc_dmi_match, "Apple MacPro2", {
        DMI_MATCH(DMI_BOARD_VENDOR,"Apple"),
        DMI_MATCH(DMI_PRODUCT_NAME,"MacPro2") },
            (void*)&applesmc_dmi_data[3]},
      { .ident = NULL }
};

static int __init applesmc_init(void)
{
      int ret;
      int count;
      int i;

      if (!dmi_check_system(applesmc_whitelist)) {
            printk(KERN_WARNING "applesmc: supported laptop not found!\n");
            ret = -ENODEV;
            goto out;
      }

      if (!request_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS,
                                                "applesmc")) {
            ret = -ENXIO;
            goto out;
      }

      ret = platform_driver_register(&applesmc_driver);
      if (ret)
            goto out_region;

      pdev = platform_device_register_simple("applesmc", APPLESMC_DATA_PORT,
                                     NULL, 0);
      if (IS_ERR(pdev)) {
            ret = PTR_ERR(pdev);
            goto out_driver;
      }

      ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_name.attr);
      if (ret)
            goto out_device;

      /* Create key enumeration sysfs files */
      ret = sysfs_create_group(&pdev->dev.kobj, &key_enumeration_group);
      if (ret)
            goto out_name;

      /* create fan files */
      count = applesmc_get_fan_count();
      if (count < 0) {
            printk(KERN_ERR "applesmc: Cannot get the number of fans.\n");
      } else {
            printk(KERN_INFO "applesmc: %d fans found.\n", count);

            switch (count) {
            default:
                  printk(KERN_WARNING "applesmc: More than 4 fans found,"
                              " but at most 4 fans are supported"
                                    " by the driver.\n");
            case 4:
                  ret = sysfs_create_group(&pdev->dev.kobj,
                                     &fan_attribute_groups[3]);
                  if (ret)
                        goto out_key_enumeration;
            case 3:
                  ret = sysfs_create_group(&pdev->dev.kobj,
                                     &fan_attribute_groups[2]);
                  if (ret)
                        goto out_key_enumeration;
            case 2:
                  ret = sysfs_create_group(&pdev->dev.kobj,
                                     &fan_attribute_groups[1]);
                  if (ret)
                        goto out_key_enumeration;
            case 1:
                  ret = sysfs_create_group(&pdev->dev.kobj,
                                     &fan_attribute_groups[0]);
                  if (ret)
                        goto out_fan_1;
            case 0:
                  ;
            }
      }

      for (i = 0;
           temperature_sensors_sets[applesmc_temperature_set][i] != NULL;
           i++) {
            if (temperature_attributes[i] == NULL) {
                  printk(KERN_ERR "applesmc: More temperature sensors "
                        "in temperature_sensors_sets (at least %i)"
                        "than available sysfs files in "
                        "temperature_attributes (%i), please report "
                        "this bug.\n", i, i-1);
                  goto out_temperature;
            }
            ret = sysfs_create_file(&pdev->dev.kobj,
                                    temperature_attributes[i]);
            if (ret)
                  goto out_temperature;
      }

      if (applesmc_accelerometer) {
            ret = applesmc_create_accelerometer();
            if (ret)
                  goto out_temperature;
      }

      if (applesmc_light) {
            /* Add light sensor file */
            ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_light.attr);
            if (ret)
                  goto out_accelerometer;

            /* Create the workqueue */
            applesmc_led_wq = create_singlethread_workqueue("applesmc-led");
            if (!applesmc_led_wq) {
                  ret = -ENOMEM;
                  goto out_light_sysfs;
            }

            /* register as a led device */
            ret = led_classdev_register(&pdev->dev, &applesmc_backlight);
            if (ret < 0)
                  goto out_light_wq;
      }

      hwmon_dev = hwmon_device_register(&pdev->dev);
      if (IS_ERR(hwmon_dev)) {
            ret = PTR_ERR(hwmon_dev);
            goto out_light_ledclass;
      }

      printk(KERN_INFO "applesmc: driver successfully loaded.\n");

      return 0;

out_light_ledclass:
      if (applesmc_light)
            led_classdev_unregister(&applesmc_backlight);
out_light_wq:
      if (applesmc_light)
            destroy_workqueue(applesmc_led_wq);
out_light_sysfs:
      if (applesmc_light)
            sysfs_remove_file(&pdev->dev.kobj, &dev_attr_light.attr);
out_accelerometer:
      if (applesmc_accelerometer)
            applesmc_release_accelerometer();
out_temperature:
      sysfs_remove_group(&pdev->dev.kobj, &temperature_attributes_group);
      sysfs_remove_group(&pdev->dev.kobj, &fan_attribute_groups[0]);
out_fan_1:
      sysfs_remove_group(&pdev->dev.kobj, &fan_attribute_groups[1]);
out_key_enumeration:
      sysfs_remove_group(&pdev->dev.kobj, &key_enumeration_group);
out_name:
      sysfs_remove_file(&pdev->dev.kobj, &dev_attr_name.attr);
out_device:
      platform_device_unregister(pdev);
out_driver:
      platform_driver_unregister(&applesmc_driver);
out_region:
      release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
out:
      printk(KERN_WARNING "applesmc: driver init failed (ret=%d)!\n", ret);
      return ret;
}

static void __exit applesmc_exit(void)
{
      hwmon_device_unregister(hwmon_dev);
      if (applesmc_light) {
            led_classdev_unregister(&applesmc_backlight);
            destroy_workqueue(applesmc_led_wq);
            sysfs_remove_file(&pdev->dev.kobj, &dev_attr_light.attr);
      }
      if (applesmc_accelerometer)
            applesmc_release_accelerometer();
      sysfs_remove_group(&pdev->dev.kobj, &temperature_attributes_group);
      sysfs_remove_group(&pdev->dev.kobj, &fan_attribute_groups[0]);
      sysfs_remove_group(&pdev->dev.kobj, &fan_attribute_groups[1]);
      sysfs_remove_group(&pdev->dev.kobj, &key_enumeration_group);
      sysfs_remove_file(&pdev->dev.kobj, &dev_attr_name.attr);
      platform_device_unregister(pdev);
      platform_driver_unregister(&applesmc_driver);
      release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);

      printk(KERN_INFO "applesmc: driver unloaded.\n");
}

module_init(applesmc_init);
module_exit(applesmc_exit);

MODULE_AUTHOR("Nicolas Boichat");
MODULE_DESCRIPTION("Apple SMC");
MODULE_LICENSE("GPL v2");

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