hwmon: (applesmc) Dynamic creation of temperature files

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / hwmon / 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
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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

/* wait up to 32 ms for a status change. */
#define APPLESMC_MIN_WAIT       0x0040
#define APPLESMC_MAX_WAIT       0x8000

#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 (6-10 bytes) */
#define LIGHT_SENSOR_RIGHT_KEY  "ALV1" /* r-o {alv (6-10 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] */

/* 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

#define to_index(attr) (to_sensor_dev_attr(attr)->index)

/* 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;
};

/* Dynamic device node attributes */
struct applesmc_dev_attr {
        struct sensor_device_attribute sda;     /* hwmon attributes */
        char name[32];                          /* room for node file name */
};

/* Dynamic device node group */
struct applesmc_node_group {
        char *format;                           /* format string */
        void *show;                             /* show function */
        void *store;                            /* store function */
        struct applesmc_dev_attr *nodes;        /* dynamic node array */
};

/* AppleSMC entry - cached register information */
struct applesmc_entry {
        char key[5];            /* four-letter key code */
        u8 valid;               /* set when entry is successfully read once */
        u8 len;                 /* bounded by APPLESMC_MAX_DATA_LENGTH */
        char type[5];           /* four-letter type code */
        u8 flags;               /* 0x10: func; 0x40: write; 0x80: read */
};

/* Register lookup and registers common to all SMCs */
static struct applesmc_registers {
        struct mutex mutex;             /* register read/write mutex */
        unsigned int key_count;         /* number of SMC registers */
        unsigned int temp_count;        /* number of temperature registers */
        unsigned int temp_begin;        /* temperature lower index bound */
        unsigned int temp_end;          /* temperature upper index bound */
        bool init_complete;             /* true when fully initialized */
        struct applesmc_entry *cache;   /* cached key entries */
} smcreg = {
        .mutex = __MUTEX_INITIALIZER(smcreg.mutex),
};

static const int debug;
static struct platform_device *pdev;
static s16 rest_x;
static s16 rest_y;
static u8 backlight_state[2];

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;

/* The number of fans handled by the driver */
static unsigned int fans_handled;

/*
 * 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 32ms 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)
{
        int us;

        val = val & APPLESMC_STATUS_MASK;

        for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
                udelay(us);
                if ((inb(APPLESMC_CMD_PORT) & APPLESMC_STATUS_MASK) == val) {
                        return 0;
                }
        }

        return -EIO;
}

/*
 * special treatment of command port - on newer macbooks, it seems necessary
 * to resend the command byte before polling the status again. Callers must
 * hold applesmc_lock.
 */
static int send_command(u8 cmd)
{
        int us;
        for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
                outb(cmd, APPLESMC_CMD_PORT);
                udelay(us);
                if ((inb(APPLESMC_CMD_PORT) & APPLESMC_STATUS_MASK) == 0x0c)
                        return 0;
        }
        return -EIO;
}

static int send_argument(const char *key)
{
        int i;

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

static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
{
        int i;

        if (send_command(cmd) || send_argument(key)) {
                pr_warn("%s: read arg fail\n", key);
                return -EIO;
        }

        outb(len, APPLESMC_DATA_PORT);

        for (i = 0; i < len; i++) {
                if (__wait_status(0x05)) {
                        pr_warn("%s: read data fail\n", key);
                        return -EIO;
                }
                buffer[i] = inb(APPLESMC_DATA_PORT);
        }

        return 0;
}

static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
{
        int i;

        if (send_command(cmd) || send_argument(key)) {
                pr_warn("%s: write arg fail\n", key);
                return -EIO;
        }

        outb(len, APPLESMC_DATA_PORT);

        for (i = 0; i < len; i++) {
                if (__wait_status(0x04)) {
                        pr_warn("%s: write data fail\n", key);
                        return -EIO;
                }
                outb(buffer[i], APPLESMC_DATA_PORT);
        }

        return 0;
}

static int read_register_count(unsigned int *count)
{
        __be32 be;
        int ret;

        ret = read_smc(APPLESMC_READ_CMD, KEY_COUNT_KEY, (u8 *)&be, 4);
        if (ret)
                return ret;

        *count = be32_to_cpu(be);
        return 0;
}

/*
 * Serialized I/O
 *
 * Returns zero on success or a negative error on failure.
 * All functions below are concurrency safe - callers should NOT hold lock.
 */

static int applesmc_read_entry(const struct applesmc_entry *entry,
                               u8 *buf, u8 len)
{
        int ret;

        if (entry->len != len)
                return -EINVAL;
        mutex_lock(&smcreg.mutex);
        ret = read_smc(APPLESMC_READ_CMD, entry->key, buf, len);
        mutex_unlock(&smcreg.mutex);

        return ret;
}

static int applesmc_write_entry(const struct applesmc_entry *entry,
                                const u8 *buf, u8 len)
{
        int ret;

        if (entry->len != len)
                return -EINVAL;
        mutex_lock(&smcreg.mutex);
        ret = write_smc(APPLESMC_WRITE_CMD, entry->key, buf, len);
        mutex_unlock(&smcreg.mutex);
        return ret;
}

static const struct applesmc_entry *applesmc_get_entry_by_index(int index)
{
        struct applesmc_entry *cache = &smcreg.cache[index];
        u8 key[4], info[6];
        __be32 be;
        int ret = 0;

        if (cache->valid)
                return cache;

        mutex_lock(&smcreg.mutex);

        if (cache->valid)
                goto out;
        be = cpu_to_be32(index);
        ret = read_smc(APPLESMC_GET_KEY_BY_INDEX_CMD, (u8 *)&be, key, 4);
        if (ret)
                goto out;
        ret = read_smc(APPLESMC_GET_KEY_TYPE_CMD, key, info, 6);
        if (ret)
                goto out;

        memcpy(cache->key, key, 4);
        cache->len = info[0];
        memcpy(cache->type, &info[1], 4);
        cache->flags = info[5];
        cache->valid = 1;

out:
        mutex_unlock(&smcreg.mutex);
        if (ret)
                return ERR_PTR(ret);
        return cache;
}

static int applesmc_get_lower_bound(unsigned int *lo, const char *key)
{
        int begin = 0, end = smcreg.key_count;
        const struct applesmc_entry *entry;

        while (begin != end) {
                int middle = begin + (end - begin) / 2;
                entry = applesmc_get_entry_by_index(middle);
                if (IS_ERR(entry))
                        return PTR_ERR(entry);
                if (strcmp(entry->key, key) < 0)
                        begin = middle + 1;
                else
                        end = middle;
        }

        *lo = begin;
        return 0;
}

static int applesmc_get_upper_bound(unsigned int *hi, const char *key)
{
        int begin = 0, end = smcreg.key_count;
        const struct applesmc_entry *entry;

        while (begin != end) {
                int middle = begin + (end - begin) / 2;
                entry = applesmc_get_entry_by_index(middle);
                if (IS_ERR(entry))
                        return PTR_ERR(entry);
                if (strcmp(key, entry->key) < 0)
                        end = middle;
                else
                        begin = middle + 1;
        }

        *hi = begin;
        return 0;
}

static const struct applesmc_entry *applesmc_get_entry_by_key(const char *key)
{
        int begin, end;
        int ret;

        ret = applesmc_get_lower_bound(&begin, key);
        if (ret)
                return ERR_PTR(ret);
        ret = applesmc_get_upper_bound(&end, key);
        if (ret)
                return ERR_PTR(ret);
        if (end - begin != 1)
                return ERR_PTR(-EINVAL);

        return applesmc_get_entry_by_index(begin);
}

static int applesmc_read_key(const char *key, u8 *buffer, u8 len)
{
        const struct applesmc_entry *entry;

        entry = applesmc_get_entry_by_key(key);
        if (IS_ERR(entry))
                return PTR_ERR(entry);

        return applesmc_read_entry(entry, buffer, len);
}

static int applesmc_write_key(const char *key, const u8 *buffer, u8 len)
{
        const struct applesmc_entry *entry;

        entry = applesmc_get_entry_by_key(key);
        if (IS_ERR(entry))
                return PTR_ERR(entry);

        return applesmc_write_entry(entry, buffer, len);
}

/*
 * applesmc_read_motion_sensor - Read motion sensor (X, Y or Z).
 */
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.  Can sleep.
 */
static void applesmc_device_init(void)
{
        int total;
        u8 buffer[2];

        if (!applesmc_accelerometer)
                return;

        for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
                if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
                                (buffer[0] != 0x00 || buffer[1] != 0x00))
                        return;
                buffer[0] = 0xe0;
                buffer[1] = 0x00;
                applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
                msleep(INIT_WAIT_MSECS);
        }

        pr_warn("failed to init the device\n");
}

/*
 * applesmc_get_fan_count - get the number of fans.
 */
static int applesmc_get_fan_count(void)
{
        int ret;
        u8 buffer[1];

        ret = applesmc_read_key(FANS_COUNT, buffer, 1);

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

/*
 * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
 */
static int applesmc_init_smcreg_try(void)
{
        struct applesmc_registers *s = &smcreg;
        int ret;

        if (s->init_complete)
                return 0;

        ret = read_register_count(&s->key_count);
        if (ret)
                return ret;

        if (!s->cache)
                s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL);
        if (!s->cache)
                return -ENOMEM;

        ret = applesmc_get_lower_bound(&s->temp_begin, "T");
        if (ret)
                return ret;
        ret = applesmc_get_lower_bound(&s->temp_end, "U");
        if (ret)
                return ret;
        s->temp_count = s->temp_end - s->temp_begin;

        s->init_complete = true;

        pr_info("key=%d temp=%d\n", s->key_count, s->temp_count);

        return 0;
}

/*
 * applesmc_init_smcreg - Initialize register cache.
 *
 * Retries until initialization is successful, or the operation times out.
 *
 */
static int applesmc_init_smcreg(void)
{
        int ms, ret;

        for (ms = 0; ms < INIT_TIMEOUT_MSECS; ms += INIT_WAIT_MSECS) {
                ret = applesmc_init_smcreg_try();
                if (!ret) {
                        if (ms)
                                pr_info("init_smcreg() took %d ms\n", ms);
                        return 0;
                }
                msleep(INIT_WAIT_MSECS);
        }

        kfree(smcreg.cache);
        smcreg.cache = NULL;

        return ret;
}

static void applesmc_destroy_smcreg(void)
{
        kfree(smcreg.cache);
        smcreg.cache = NULL;
        smcreg.init_complete = false;
}

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

        ret = applesmc_init_smcreg();
        if (ret)
                return ret;

        applesmc_device_init();

        return 0;
}

/* Synchronize device with memorized backlight state */
static int applesmc_pm_resume(struct device *dev)
{
        if (applesmc_light)
                applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
        return 0;
}

/* Reinitialize device on resume from hibernation */
static int applesmc_pm_restore(struct device *dev)
{
        applesmc_device_init();
        return applesmc_pm_resume(dev);
}

static const struct dev_pm_ops applesmc_pm_ops = {
        .resume = applesmc_pm_resume,
        .restore = applesmc_pm_restore,
};

static struct platform_driver applesmc_driver = {
        .probe = applesmc_probe,
        .driver = {
                .name = "applesmc",
                .owner = THIS_MODULE,
                .pm = &applesmc_pm_ops,
        },
};

/*
 * 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;

        if (applesmc_read_motion_sensor(SENSOR_X, &x))
                return;
        if (applesmc_read_motion_sensor(SENSOR_Y, &y))
                return;

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

/* 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;

        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:
        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)
{
        const struct applesmc_entry *entry;
        static int data_length;
        int ret;
        u8 left = 0, right = 0;
        u8 buffer[10];

        if (!data_length) {
                entry = applesmc_get_entry_by_key(LIGHT_SENSOR_LEFT_KEY);
                if (IS_ERR(entry))
                        return PTR_ERR(entry);
                if (entry->len > 10)
                        return -ENXIO;
                data_length = entry->len;
                pr_info("light sensor data length set to %d\n", data_length);
        }

        ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, data_length);
        /* newer macbooks report a single 10-bit bigendian value */
        if (data_length == 10) {
                left = be16_to_cpu(*(__be16 *)(buffer + 6)) >> 2;
                goto out;
        }
        left = buffer[2];
        if (ret)
                goto out;
        ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length);
        right = buffer[2];

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

/* Displays sensor key as label */
static ssize_t applesmc_show_sensor_label(struct device *dev,
                        struct device_attribute *devattr, char *sysfsbuf)
{
        int index = smcreg.temp_begin + to_index(devattr);
        const struct applesmc_entry *entry;

        entry = applesmc_get_entry_by_index(index);
        if (IS_ERR(entry))
                return PTR_ERR(entry);

        return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
}

/* Displays degree Celsius * 1000 */
static ssize_t applesmc_show_temperature(struct device *dev,
                        struct device_attribute *devattr, char *sysfsbuf)
{
        int index = smcreg.temp_begin + to_index(devattr);
        const struct applesmc_entry *entry;
        int ret;
        u8 buffer[2];
        unsigned int temp;

        entry = applesmc_get_entry_by_index(index);
        if (IS_ERR(entry))
                return PTR_ERR(entry);

        ret = applesmc_read_entry(entry, buffer, 2);
        if (ret)
                return ret;

        temp = buffer[0]*1000;
        temp += (buffer[1] >> 6) * 250;

        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;

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

        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;

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

        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);

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

        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);

        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:
        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;

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

        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)
{
        applesmc_calibrate();

        return count;
}

static void applesmc_backlight_set(struct work_struct *work)
{
        applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
}
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_state[0] = 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;

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

        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)
{
        const struct applesmc_entry *entry;
        int ret;

        entry = applesmc_get_entry_by_index(key_at_index);
        if (IS_ERR(entry))
                return PTR_ERR(entry);
        ret = applesmc_read_entry(entry, sysfsbuf, entry->len);
        if (ret)
                return ret;

        return entry->len;
}

static ssize_t applesmc_key_at_index_data_length_show(struct device *dev,
                                struct device_attribute *attr, char *sysfsbuf)
{
        const struct applesmc_entry *entry;

        entry = applesmc_get_entry_by_index(key_at_index);
        if (IS_ERR(entry))
                return PTR_ERR(entry);

        return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", entry->len);
}

static ssize_t applesmc_key_at_index_type_show(struct device *dev,
                                struct device_attribute *attr, char *sysfsbuf)
{
        const struct applesmc_entry *entry;

        entry = applesmc_get_entry_by_index(key_at_index);
        if (IS_ERR(entry))
                return PTR_ERR(entry);

        return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->type);
}

static ssize_t applesmc_key_at_index_name_show(struct device *dev,
                                struct device_attribute *attr, char *sysfsbuf)
{
        const struct applesmc_entry *entry;

        entry = applesmc_get_entry_by_index(key_at_index);
        if (IS_ERR(entry))
                return PTR_ERR(entry);

        return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
}

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)
{
        unsigned long newkey;

        if (strict_strtoul(sysfsbuf, 10, &newkey) < 0
            || newkey >= smcreg.key_count)
                return -EINVAL;

        key_at_index = newkey;
        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 },
};

static struct applesmc_node_group temp_group[] = {
        { "temp%d_label", applesmc_show_sensor_label },
        { "temp%d_input", applesmc_show_temperature },
        { }
};

/* 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)
{
        struct dmi_match_data* dmi_data = id->driver_data;
        pr_info("%s detected:\n", id->ident);
        applesmc_accelerometer = dmi_data->accelerometer;
        pr_info(" - Model %s accelerometer\n",
                applesmc_accelerometer ? "with" : "without");
        applesmc_light = dmi_data->light;
        pr_info(" - Model %s light sensors and backlight\n",
                applesmc_light ? "with" : "without");

        return 1;
}

/*
 * applesmc_destroy_nodes - remove files and free associated memory
 */
static void applesmc_destroy_nodes(struct applesmc_node_group *groups)
{
        struct applesmc_node_group *grp;
        struct applesmc_dev_attr *node;

        for (grp = groups; grp->nodes; grp++) {
                for (node = grp->nodes; node->sda.dev_attr.attr.name; node++)
                        sysfs_remove_file(&pdev->dev.kobj,
                                          &node->sda.dev_attr.attr);
                kfree(grp->nodes);
                grp->nodes = NULL;
        }
}

/*
 * applesmc_create_nodes - create a two-dimensional group of sysfs files
 */
static int applesmc_create_nodes(struct applesmc_node_group *groups, int num)
{
        struct applesmc_node_group *grp;
        struct applesmc_dev_attr *node;
        struct attribute *attr;
        int ret, i;

        for (grp = groups; grp->format; grp++) {
                grp->nodes = kcalloc(num + 1, sizeof(*node), GFP_KERNEL);
                if (!grp->nodes) {
                        ret = -ENOMEM;
                        goto out;
                }
                for (i = 0; i < num; i++) {
                        node = &grp->nodes[i];
                        sprintf(node->name, grp->format, i + 1);
                        node->sda.index = i;
                        node->sda.dev_attr.show = grp->show;
                        node->sda.dev_attr.store = grp->store;
                        attr = &node->sda.dev_attr.attr;
                        attr->name = node->name;
                        attr->mode = S_IRUGO | (grp->store ? S_IWUSR : 0);
                        ret = sysfs_create_file(&pdev->dev.kobj, attr);
                        if (ret) {
                                attr->name = NULL;
                                goto out;
                        }
                }
        }

        return 0;
out:
        applesmc_destroy_nodes(groups);
        return ret;
}

/* 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:
        pr_warn("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 },
/* MacBook2: accelerometer and temperature set 1 */
        { .accelerometer = 1, .light = 0, .temperature_set = 1 },
/* MacBook: accelerometer and temperature set 2 */
        { .accelerometer = 1, .light = 0, .temperature_set = 2 },
/* MacMini: temperature set 3 */
        { .accelerometer = 0, .light = 0, .temperature_set = 3 },
/* MacPro: temperature set 4 */
        { .accelerometer = 0, .light = 0, .temperature_set = 4 },
/* iMac: temperature set 5 */
        { .accelerometer = 0, .light = 0, .temperature_set = 5 },
/* MacBook3, MacBook4: accelerometer and temperature set 6 */
        { .accelerometer = 1, .light = 0, .temperature_set = 6 },
/* MacBook Air: accelerometer, backlight and temperature set 7 */
        { .accelerometer = 1, .light = 1, .temperature_set = 7 },
/* MacBook Pro 4: accelerometer, backlight and temperature set 8 */
        { .accelerometer = 1, .light = 1, .temperature_set = 8 },
/* MacBook Pro 3: accelerometer, backlight and temperature set 9 */
        { .accelerometer = 1, .light = 1, .temperature_set = 9 },
/* iMac 5: light sensor only, temperature set 10 */
        { .accelerometer = 0, .light = 0, .temperature_set = 10 },
/* MacBook 5: accelerometer, backlight and temperature set 11 */
        { .accelerometer = 1, .light = 1, .temperature_set = 11 },
/* MacBook Pro 5: accelerometer, backlight and temperature set 12 */
        { .accelerometer = 1, .light = 1, .temperature_set = 12 },
/* iMac 8: light sensor only, temperature set 13 */
        { .accelerometer = 0, .light = 0, .temperature_set = 13 },
/* iMac 6: light sensor only, temperature set 14 */
        { .accelerometer = 0, .light = 0, .temperature_set = 14 },
/* MacBook Air 2,1: accelerometer, backlight and temperature set 15 */
        { .accelerometer = 1, .light = 1, .temperature_set = 15 },
/* MacPro3,1: temperature set 16 */
        { .accelerometer = 0, .light = 0, .temperature_set = 16 },
/* iMac 9,1: light sensor only, temperature set 17 */
        { .accelerometer = 0, .light = 0, .temperature_set = 17 },
/* MacBook Pro 2,2: accelerometer, backlight and temperature set 18 */
        { .accelerometer = 1, .light = 1, .temperature_set = 18 },
/* MacBook Pro 5,3: accelerometer, backlight and temperature set 19 */
        { .accelerometer = 1, .light = 1, .temperature_set = 19 },
/* MacBook Pro 5,4: accelerometer, backlight and temperature set 20 */
        { .accelerometer = 1, .light = 1, .temperature_set = 20 },
/* MacBook Pro 6,2: accelerometer, backlight and temperature set 21 */
        { .accelerometer = 1, .light = 1, .temperature_set = 21 },
/* MacBook Pro 7,1: accelerometer, backlight and temperature set 22 */
        { .accelerometer = 1, .light = 1, .temperature_set = 22 },
/* MacBook Air 3,1: accelerometer, backlight and temperature set 23 */
        { .accelerometer = 0, .light = 0, .temperature_set = 23 },
};

/* 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 Air 3", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir3") },
                &applesmc_dmi_data[23]},
        { applesmc_dmi_match, "Apple MacBook Air 2", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir2") },
                &applesmc_dmi_data[15]},
        { applesmc_dmi_match, "Apple MacBook Air", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir") },
                &applesmc_dmi_data[7]},
        { applesmc_dmi_match, "Apple MacBook Pro 7", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro7") },
                &applesmc_dmi_data[22]},
        { applesmc_dmi_match, "Apple MacBook Pro 5,4", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,4") },
                &applesmc_dmi_data[20]},
        { applesmc_dmi_match, "Apple MacBook Pro 5,3", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,3") },
                &applesmc_dmi_data[19]},
        { applesmc_dmi_match, "Apple MacBook Pro 6", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro6") },
                &applesmc_dmi_data[21]},
        { applesmc_dmi_match, "Apple MacBook Pro 5", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5") },
                &applesmc_dmi_data[12]},
        { applesmc_dmi_match, "Apple MacBook Pro 4", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro4") },
                &applesmc_dmi_data[8]},
        { applesmc_dmi_match, "Apple MacBook Pro 3", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3") },
                &applesmc_dmi_data[9]},
        { applesmc_dmi_match, "Apple MacBook Pro 2,2", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple Computer, Inc."),
          DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro2,2") },
                &applesmc_dmi_data[18]},
        { applesmc_dmi_match, "Apple MacBook Pro", {
          DMI_MATCH(DMI_BOARD_VENDOR,"Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME,"MacBookPro") },
                &applesmc_dmi_data[0]},
        { applesmc_dmi_match, "Apple MacBook (v2)", {
          DMI_MATCH(DMI_BOARD_VENDOR,"Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME,"MacBook2") },
                &applesmc_dmi_data[1]},
        { applesmc_dmi_match, "Apple MacBook (v3)", {
          DMI_MATCH(DMI_BOARD_VENDOR,"Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME,"MacBook3") },
                &applesmc_dmi_data[6]},
        { applesmc_dmi_match, "Apple MacBook 4", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME, "MacBook4") },
                &applesmc_dmi_data[6]},
        { applesmc_dmi_match, "Apple MacBook 5", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5") },
                &applesmc_dmi_data[11]},
        { applesmc_dmi_match, "Apple MacBook", {
          DMI_MATCH(DMI_BOARD_VENDOR,"Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME,"MacBook") },
                &applesmc_dmi_data[2]},
        { applesmc_dmi_match, "Apple Macmini", {
          DMI_MATCH(DMI_BOARD_VENDOR,"Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME,"Macmini") },
                &applesmc_dmi_data[3]},
        { applesmc_dmi_match, "Apple MacPro2", {
          DMI_MATCH(DMI_BOARD_VENDOR,"Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME,"MacPro2") },
                &applesmc_dmi_data[4]},
        { applesmc_dmi_match, "Apple MacPro3", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME, "MacPro3") },
                &applesmc_dmi_data[16]},
        { applesmc_dmi_match, "Apple MacPro", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME, "MacPro") },
                &applesmc_dmi_data[4]},
        { applesmc_dmi_match, "Apple iMac 9,1", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple Inc."),
          DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1") },
                &applesmc_dmi_data[17]},
        { applesmc_dmi_match, "Apple iMac 8", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME, "iMac8") },
                &applesmc_dmi_data[13]},
        { applesmc_dmi_match, "Apple iMac 6", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME, "iMac6") },
                &applesmc_dmi_data[14]},
        { applesmc_dmi_match, "Apple iMac 5", {
          DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME, "iMac5") },
                &applesmc_dmi_data[10]},
        { applesmc_dmi_match, "Apple iMac", {
          DMI_MATCH(DMI_BOARD_VENDOR,"Apple"),
          DMI_MATCH(DMI_PRODUCT_NAME,"iMac") },
                &applesmc_dmi_data[5]},
        { .ident = NULL }
};

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

        if (!dmi_check_system(applesmc_whitelist)) {
                pr_warn("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;
        }

        /* create register cache */
        ret = applesmc_init_smcreg();
        if (ret)
                goto out_device;

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

        /* 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)
                pr_err("Cannot get the number of fans\n");
        else
                pr_info("%d fans found\n", count);

        if (count > 4) {
                count = 4;
                pr_warn("A maximum of 4 fans are supported by this driver\n");
        }

        while (fans_handled < count) {
                ret = sysfs_create_group(&pdev->dev.kobj,
                                         &fan_attribute_groups[fans_handled]);
                if (ret)
                        goto out_fans;
                fans_handled++;
        }

        ret = applesmc_create_nodes(temp_group, smcreg.temp_count);
        if (ret)
                goto out_fans;

        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;
        }

        pr_info("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:
        applesmc_destroy_nodes(temp_group);
out_fans:
        while (fans_handled)
                sysfs_remove_group(&pdev->dev.kobj,
                                   &fan_attribute_groups[--fans_handled]);
        sysfs_remove_group(&pdev->dev.kobj, &key_enumeration_group);
out_name:
        sysfs_remove_file(&pdev->dev.kobj, &dev_attr_name.attr);
out_smcreg:
        applesmc_destroy_smcreg();
out_device:
        platform_device_unregister(pdev);
out_driver:
        platform_driver_unregister(&applesmc_driver);
out_region:
        release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
out:
        pr_warn("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();
        applesmc_destroy_nodes(temp_group);
        while (fans_handled)
                sysfs_remove_group(&pdev->dev.kobj,
                                   &fan_attribute_groups[--fans_handled]);
        sysfs_remove_group(&pdev->dev.kobj, &key_enumeration_group);
        sysfs_remove_file(&pdev->dev.kobj, &dev_attr_name.attr);
        applesmc_destroy_smcreg();
        platform_device_unregister(pdev);
        platform_driver_unregister(&applesmc_driver);
        release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);

        pr_info("driver unloaded\n");
}

module_init(applesmc_init);
module_exit(applesmc_exit);

MODULE_AUTHOR("Nicolas Boichat");
MODULE_DESCRIPTION("Apple SMC");
MODULE_LICENSE("GPL v2");
MODULE_DEVICE_TABLE(dmi, applesmc_whitelist);