[WATCHDOG] add watchdog driver IT8716 IT8726 IT8712J/K

Add it87xx watchdog driver
IT8716 IT8718 IT8726 IT8712-J IT8712-K

Signed-off-by: Oliver Schuster <olivers137@aol.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 725 insertions, 0 deletions

diff --git a/drivers/watchdog/it87_wdt.c b/drivers/watchdog/it87_wdt.c
new file mode 100644
index 000000000000..afb8af397a9f
--- /dev/null
+++ b/drivers/watchdog/it87_wdt.c
@@ -0,0 +1,725 @@
+/*
+ *      Watchdog Timer Driver
+ *         for ITE IT87xx Environment Control - Low Pin Count Input / Output
+ *
+ *      (c) Copyright 2007  Oliver Schuster <olivers137@aol.com>
+ *
+ *      Based on softdog.c      by Alan Cox,
+ *               83977f_wdt.c   by Jose Goncalves,
+ *               it87.c         by Chris Gauthron, Jean Delvare
+ *
+ *      Data-sheets: Publicly available at the ITE website
+ *                  http://www.ite.com.tw/
+ *
+ *      Support of the watchdog timers, which are available on
+ *      IT8716, IT8718, IT8726 and IT8712 (J,K version).
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ *
+ *      This program is distributed in the hope that it will be useful,
+ *      but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *      GNU General Public License for more details.
+ *
+ *      You should have received a copy of the GNU General Public License
+ *      along with this program; if not, write to the Free Software
+ *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/watchdog.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+
+#include <asm/system.h>
+
+#define WATCHDOG_VERSION        "1.12"
+#define WATCHDOG_NAME           "IT87 WDT"
+#define PFX                     WATCHDOG_NAME ": "
+#define DRIVER_VERSION          WATCHDOG_NAME " driver, v" WATCHDOG_VERSION "\n"
+#define WD_MAGIC                'V'
+
+/* Defaults for Module Parameter */
+#define DEFAULT_NOGAMEPORT      0
+#define DEFAULT_EXCLUSIVE       1
+#define DEFAULT_TIMEOUT         60
+#define DEFAULT_TESTMODE        0
+#define DEFAULT_NOWAYOUT        WATCHDOG_NOWAYOUT
+
+/* IO Ports */
+#define REG             0x2e
+#define VAL             0x2f
+
+/* Logical device Numbers LDN */
+#define GPIO            0x07
+#define GAMEPORT        0x09
+#define CIR             0x0a
+
+/* Configuration Registers and Functions */
+#define LDNREG          0x07
+#define CHIPID          0x20
+#define CHIPREV         0x22
+#define ACTREG          0x30
+#define BASEREG         0x60
+
+/* Chip Id numbers */
+#define NO_DEV_ID       0xffff
+#define IT8705_ID       0x8705
+#define IT8712_ID       0x8712
+#define IT8716_ID       0x8716
+#define IT8718_ID       0x8718
+#define IT8726_ID       0x8726  /* the data sheet suggest wrongly 0x8716 */
+
+/* GPIO Configuration Registers LDN=0x07 */
+#define WDTCTRL         0x71
+#define WDTCFG          0x72
+#define WDTVALLSB       0x73
+#define WDTVALMSB       0x74
+
+/* GPIO Bits WDTCTRL */
+#define WDT_CIRINT      0x80
+#define WDT_MOUSEINT    0x40
+#define WDT_KYBINT      0x20
+#define WDT_GAMEPORT    0x10 /* not it8718 */
+#define WDT_FORCE       0x02
+#define WDT_ZERO        0x01
+
+/* GPIO Bits WDTCFG */
+#define WDT_TOV1        0x80
+#define WDT_KRST        0x40
+#define WDT_TOVE        0x20
+#define WDT_PWROK       0x10
+#define WDT_INT_MASK    0x0f
+
+/* CIR Configuration Register LDN=0x0a */
+#define CIR_ILS         0x70
+
+/* The default Base address is not always available, we use this */
+#define CIR_BASE        0x0208
+
+/* CIR Controller */
+#define CIR_DR(b)       (b)
+#define CIR_IER(b)      (b + 1)
+#define CIR_RCR(b)      (b + 2)
+#define CIR_TCR1(b)     (b + 3)
+#define CIR_TCR2(b)     (b + 4)
+#define CIR_TSR(b)      (b + 5)
+#define CIR_RSR(b)      (b + 6)
+#define CIR_BDLR(b)     (b + 5)
+#define CIR_BDHR(b)     (b + 6)
+#define CIR_IIR(b)      (b + 7)
+
+/* Default Base address of Game port */
+#define GP_BASE_DEFAULT 0x0201
+
+/* wdt_status */
+#define WDTS_TIMER_RUN  0
+#define WDTS_DEV_OPEN   1
+#define WDTS_KEEPALIVE  2
+#define WDTS_LOCKED     3
+#define WDTS_USE_GP     4
+#define WDTS_EXPECTED   5
+
+static  unsigned int base, gpact, ciract;
+static  unsigned long wdt_status;
+static  DEFINE_SPINLOCK(spinlock);
+
+static  int nogameport = DEFAULT_NOGAMEPORT;
+static  int exclusive  = DEFAULT_EXCLUSIVE;
+static  int timeout    = DEFAULT_TIMEOUT;
+static  int testmode   = DEFAULT_TESTMODE;
+static  int nowayout   = DEFAULT_NOWAYOUT;
+
+module_param(nogameport, int, 0);
+MODULE_PARM_DESC(nogameport, "Forbid the activation of game port, default="
+                __MODULE_STRING(DEFAULT_NOGAMEPORT));
+module_param(exclusive, int, 0);
+MODULE_PARM_DESC(exclusive, "Watchdog exclusive device open, default="
+                __MODULE_STRING(DEFAULT_EXCLUSIVE));
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds, default="
+                __MODULE_STRING(DEFAULT_TIMEOUT));
+module_param(testmode, int, 0);
+MODULE_PARM_DESC(testmode, "Watchdog test mode (1 = no reboot), default="
+                __MODULE_STRING(DEFAULT_TESTMODE));
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started, default="
+                __MODULE_STRING(WATCHDOG_NOWAYOUT));
+
+/* Superio Chip */
+
+static inline void superio_enter(void)
+{
+        outb(0x87, REG);
+        outb(0x01, REG);
+        outb(0x55, REG);
+        outb(0x55, REG);
+}
+
+static inline void superio_exit(void)
+{
+        outb(0x02, REG);
+        outb(0x02, VAL);
+}
+
+static inline void superio_select(int ldn)
+{
+        outb(LDNREG, REG);
+        outb(ldn, VAL);
+}
+
+static inline int superio_inb(int reg)
+{
+        outb(reg, REG);
+        return inb(VAL);
+}
+
+static inline void superio_outb(int val, int reg)
+{
+       outb(reg, REG);
+       outb(val, VAL);
+}
+
+static inline int superio_inw(int reg)
+{
+        int val;
+        outb(reg++, REG);
+        val = inb(VAL) << 8;
+        outb(reg, REG);
+        val |= inb(VAL);
+        return val;
+}
+
+static inline void superio_outw(int val, int reg)
+{
+       outb(reg++, REG);
+       outb(val >> 8, VAL);
+       outb(reg, REG);
+       outb(val, VAL);
+}
+
+/* watchdog timer handling */
+
+static void wdt_keepalive(void)
+{
+        if (test_bit(WDTS_USE_GP, &wdt_status))
+                inb(base);
+        else
+                /* The timer reloads with around 5 msec delay */
+                outb(0x55, CIR_DR(base));
+        set_bit(WDTS_KEEPALIVE, &wdt_status);
+}
+
+static void wdt_start(void)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&spinlock, flags);
+        superio_enter();
+
+        superio_select(GPIO);
+        if (test_bit(WDTS_USE_GP, &wdt_status))
+                superio_outb(WDT_GAMEPORT, WDTCTRL);
+        else
+                superio_outb(WDT_CIRINT, WDTCTRL);
+        if (!testmode)
+                superio_outb(WDT_TOV1 | WDT_KRST | WDT_PWROK, WDTCFG);
+        else
+                superio_outb(WDT_TOV1, WDTCFG);
+        superio_outb(timeout>>8, WDTVALMSB);
+        superio_outb(timeout, WDTVALLSB);
+
+        superio_exit();
+        spin_unlock_irqrestore(&spinlock, flags);
+}
+
+static void wdt_stop(void)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&spinlock, flags);
+        superio_enter();
+
+        superio_select(GPIO);
+        superio_outb(0x00, WDTCTRL);
+        superio_outb(WDT_TOV1, WDTCFG);
+        superio_outb(0x00, WDTVALMSB);
+        superio_outb(0x00, WDTVALLSB);
+
+        superio_exit();
+        spin_unlock_irqrestore(&spinlock, flags);
+}
+
+/**
+ *      wdt_set_timeout - set a new timeout value with watchdog ioctl
+ *      @t: timeout value in seconds
+ *
+ *      The hardware device has a 16 bit watchdog timer, thus the
+ *      timeout time ranges between 1 and 65535 seconds.
+ *
+ *      Used within WDIOC_SETTIMEOUT watchdog device ioctl.
+ */
+
+static int wdt_set_timeout(int t)
+{
+        unsigned long flags;
+
+        if (t < 1 || t > 65535)
+                return -EINVAL;
+
+        timeout = t;
+
+        spin_lock_irqsave(&spinlock, flags);
+        if (test_bit(WDTS_TIMER_RUN, &wdt_status)) {
+                superio_enter();
+
+                superio_select(GPIO);
+                superio_outb(t>>8, WDTVALMSB);
+                superio_outb(t, WDTVALLSB);
+
+                superio_exit();
+        }
+        spin_unlock_irqrestore(&spinlock, flags);
+        return 0;
+}
+
+/**
+ *      wdt_get_status - determines the status supported by watchdog ioctl
+ *      @status: status returned to user space
+ *
+ *      The status bit of the device does not allow to distinguish
+ *      between a regular system reset and a watchdog forced reset.
+ *      But, in test mode it is useful, so it is supported through
+ *      WDIOC_GETSTATUS watchdog ioctl. Additionally the driver
+ *      reports the keepalive signal and the acception of the magic.
+ *
+ *      Used within WDIOC_GETSTATUS watchdog device ioctl.
+ */
+
+static int wdt_get_status(int *status)
+{
+        unsigned long flags;
+
+        *status = 0;
+        if (testmode) {
+                spin_lock_irqsave(&spinlock, flags);
+                superio_enter();
+                superio_select(GPIO);
+                if (superio_inb(WDTCTRL) & WDT_ZERO) {
+                        superio_outb(0x00, WDTCTRL);
+                        clear_bit(WDTS_TIMER_RUN, &wdt_status);
+                        *status |= WDIOF_CARDRESET;
+                }
+
+                superio_exit();
+                spin_unlock_irqrestore(&spinlock, flags);
+        }
+        if (test_and_clear_bit(WDTS_KEEPALIVE, &wdt_status))
+                *status |= WDIOF_KEEPALIVEPING;
+        if (test_bit(WDTS_EXPECTED, &wdt_status))
+                *status |= WDIOF_MAGICCLOSE;
+        return 0;
+}
+
+/* /dev/watchdog handling */
+
+/**
+ *      wdt_open - watchdog file_operations .open
+ *      @inode: inode of the device
+ *      @file: file handle to the device
+ *
+ *      The watchdog timer starts by opening the device.
+ *
+ *      Used within the file operation of the watchdog device.
+ */
+
+static int wdt_open(struct inode *inode, struct file *file)
+{
+        if (exclusive && test_and_set_bit(WDTS_DEV_OPEN, &wdt_status))
+                return -EBUSY;
+        if (!test_and_set_bit(WDTS_TIMER_RUN, &wdt_status)) {
+                if (nowayout && !test_and_set_bit(WDTS_LOCKED, &wdt_status))
+                        __module_get(THIS_MODULE);
+                wdt_start();
+        }
+        return nonseekable_open(inode, file);
+}
+
+/**
+ *      wdt_release - watchdog file_operations .release
+ *      @inode: inode of the device
+ *      @file: file handle to the device
+ *
+ *      Closing the watchdog device either stops the watchdog timer
+ *      or in the case, that nowayout is set or the magic character
+ *      wasn't written, a critical warning about an running watchdog
+ *      timer is given.
+ *
+ *      Used within the file operation of the watchdog device.
+ */
+
+static int wdt_release(struct inode *inode, struct file *file)
+{
+        if (test_bit(WDTS_TIMER_RUN, &wdt_status)) {
+                if (test_and_clear_bit(WDTS_EXPECTED, &wdt_status)) {
+                        wdt_stop();
+                        clear_bit(WDTS_TIMER_RUN, &wdt_status);
+                } else {
+                        wdt_keepalive();
+                        printk(KERN_CRIT PFX
+                               "unexpected close, not stopping watchdog!\n");
+                }
+        }
+        clear_bit(WDTS_DEV_OPEN, &wdt_status);
+        return 0;
+}
+
+/**
+ *      wdt_write - watchdog file_operations .write
+ *      @file: file handle to the watchdog
+ *      @buf: buffer to write
+ *      @count: count of bytes
+ *      @ppos: pointer to the position to write. No seeks allowed
+ *
+ *      A write to a watchdog device is defined as a keepalive signal. Any
+ *      write of data will do, as we don't define content meaning.
+ *
+ *      Used within the file operation of the watchdog device.
+ */
+
+static ssize_t wdt_write(struct file *file, const char __user *buf,
+                            size_t count, loff_t *ppos)
+{
+        if (count) {
+                clear_bit(WDTS_EXPECTED, &wdt_status);
+                wdt_keepalive();
+        }
+        if (!nowayout) {
+                size_t ofs;
+
+        /* note: just in case someone wrote the magic character long ago */
+                for (ofs = 0; ofs != count; ofs++) {
+                        char c;
+                        if (get_user(c, buf + ofs))
+                                return -EFAULT;
+                        if (c == WD_MAGIC)
+                                set_bit(WDTS_EXPECTED, &wdt_status);
+                }
+        }
+        return count;
+}
+
+static struct watchdog_info ident = {
+        .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
+        .firmware_version =     1,
+        .identity = WATCHDOG_NAME,
+};
+
+/**
+ *      wdt_ioctl - watchdog file_operations .unlocked_ioctl
+ *      @file: file handle to the device
+ *      @cmd: watchdog command
+ *      @arg: argument pointer
+ *
+ *      The watchdog API defines a common set of functions for all watchdogs
+ *      according to their available features.
+ *
+ *      Used within the file operation of the watchdog device.
+ */
+
+static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+        int rc = 0, status, new_options, new_timeout;
+        union {
+                struct watchdog_info __user *ident;
+                int __user *i;
+        } uarg;
+
+        uarg.i = (int __user *)arg;
+
+        switch (cmd) {
+        case WDIOC_GETSUPPORT:
+                return copy_to_user(uarg.ident,
+                                    &ident, sizeof(ident)) ? -EFAULT : 0;
+
+        case WDIOC_GETSTATUS:
+                wdt_get_status(&status);
+                return put_user(status, uarg.i);
+
+        case WDIOC_GETBOOTSTATUS:
+                return put_user(0, uarg.i);
+
+        case WDIOC_KEEPALIVE:
+                wdt_keepalive();
+                return 0;
+
+        case WDIOC_SETOPTIONS:
+                if (get_user(new_options, uarg.i))
+                        return -EFAULT;
+
+                switch (new_options) {
+                case WDIOS_DISABLECARD:
+                        if (test_bit(WDTS_TIMER_RUN, &wdt_status))
+                                wdt_stop();
+                        clear_bit(WDTS_TIMER_RUN, &wdt_status);
+                        return 0;
+
+                case WDIOS_ENABLECARD:
+                        if (!test_and_set_bit(WDTS_TIMER_RUN, &wdt_status))
+                                wdt_start();
+                        return 0;
+
+                default:
+                        return -EFAULT;
+                }
+
+        case WDIOC_SETTIMEOUT:
+                if (get_user(new_timeout, uarg.i))
+                        return -EFAULT;
+                rc = wdt_set_timeout(new_timeout);
+        case WDIOC_GETTIMEOUT:
+                if (put_user(timeout, uarg.i))
+                        return -EFAULT;
+                return rc;
+
+        default:
+                return -ENOTTY;
+        }
+}
+
+static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
+        void *unused)
+{
+        if (code == SYS_DOWN || code == SYS_HALT)
+                wdt_stop();
+        return NOTIFY_DONE;
+}
+
+static const struct file_operations wdt_fops = {
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .write          = wdt_write,
+        .unlocked_ioctl = wdt_ioctl,
+        .open           = wdt_open,
+        .release        = wdt_release,
+};
+
+static struct miscdevice wdt_miscdev = {
+        .minor          = WATCHDOG_MINOR,
+        .name           = "watchdog",
+        .fops           = &wdt_fops,
+};
+
+static struct notifier_block wdt_notifier = {
+        .notifier_call = wdt_notify_sys,
+};
+
+static int __init it87_wdt_init(void)
+{
+        int rc = 0;
+        u16 chip_type;
+        u8  chip_rev;
+        unsigned long flags;
+
+        spin_lock_irqsave(&spinlock, flags);
+        superio_enter();
+        chip_type = superio_inw(CHIPID);
+        chip_rev  = superio_inb(CHIPREV) & 0x0f;
+        superio_exit();
+        spin_unlock_irqrestore(&spinlock, flags);
+
+        switch (chip_type) {
+        case IT8716_ID:
+        case IT8718_ID:
+        case IT8726_ID:
+                break;
+        case IT8712_ID:
+                if (chip_rev > 7)
+                        break;
+        case IT8705_ID:
+                printk(KERN_ERR PFX
+                       "Unsupported Chip found, Chip %04x Revision %02x\n",
+                       chip_type, chip_rev);
+                return -ENODEV;
+        case NO_DEV_ID:
+                printk(KERN_ERR PFX "no device\n");
+                return -ENODEV;
+        default:
+                printk(KERN_ERR PFX
+                       "Unknown Chip found, Chip %04x Revision %04x\n",
+                       chip_type, chip_rev);
+                return -ENODEV;
+        }
+
+        spin_lock_irqsave(&spinlock, flags);
+        superio_enter();
+
+        superio_select(GPIO);
+        superio_outb(WDT_TOV1, WDTCFG);
+        superio_outb(0x00, WDTCTRL);
+
+        /* First try to get Gameport support */
+        if (chip_type != IT8718_ID && !nogameport) {
+                superio_select(GAMEPORT);
+                base = superio_inw(BASEREG);
+                if (!base) {
+                        base = GP_BASE_DEFAULT;
+                        superio_outw(base, BASEREG);
+                }
+                gpact = superio_inb(ACTREG);
+                superio_outb(0x01, ACTREG);
+                superio_exit();
+                spin_unlock_irqrestore(&spinlock, flags);
+                if (request_region(base, 1, WATCHDOG_NAME))
+                        set_bit(WDTS_USE_GP, &wdt_status);
+                else
+                        rc = -EIO;
+        } else {
+                superio_exit();
+                spin_unlock_irqrestore(&spinlock, flags);
+        }
+
+        /* If we haven't Gameport support, try to get CIR support */
+        if (!test_bit(WDTS_USE_GP, &wdt_status)) {
+                if (!request_region(CIR_BASE, 8, WATCHDOG_NAME)) {
+                        if (rc == -EIO)
+                                printk(KERN_ERR PFX
+                                        "I/O Address 0x%04x and 0x%04x"
+                                        " already in use\n", base, CIR_BASE);
+                        else
+                                printk(KERN_ERR PFX
+                                        "I/O Address 0x%04x already in use\n",
+                                        CIR_BASE);
+                        rc = -EIO;
+                        goto err_out;
+                }
+                base = CIR_BASE;
+                spin_lock_irqsave(&spinlock, flags);
+                superio_enter();
+
+                superio_select(CIR);
+                superio_outw(base, BASEREG);
+                superio_outb(0x00, CIR_ILS);
+                ciract = superio_inb(ACTREG);
+                superio_outb(0x01, ACTREG);
+                if (rc == -EIO) {
+                        superio_select(GAMEPORT);
+                        superio_outb(gpact, ACTREG);
+                }
+
+                superio_exit();
+                spin_unlock_irqrestore(&spinlock, flags);
+        }
+
+        if (timeout < 1 || timeout > 65535) {
+                timeout = DEFAULT_TIMEOUT;
+                printk(KERN_WARNING PFX
+                       "Timeout value out of range, use default %d sec\n",
+                       DEFAULT_TIMEOUT);
+        }
+
+        rc = register_reboot_notifier(&wdt_notifier);
+        if (rc) {
+                printk(KERN_ERR PFX
+                       "Cannot register reboot notifier (err=%d)\n", rc);
+                goto err_out_region;
+        }
+
+        rc = misc_register(&wdt_miscdev);
+        if (rc) {
+                printk(KERN_ERR PFX
+                       "Cannot register miscdev on minor=%d (err=%d)\n",
+                        wdt_miscdev.minor, rc);
+                goto err_out_reboot;
+        }
+
+        /* Initialize CIR to use it as keepalive source */
+        if (!test_bit(WDTS_USE_GP, &wdt_status)) {
+                outb(0x00, CIR_RCR(base));
+                outb(0xc0, CIR_TCR1(base));
+                outb(0x5c, CIR_TCR2(base));
+                outb(0x10, CIR_IER(base));
+                outb(0x00, CIR_BDHR(base));
+                outb(0x01, CIR_BDLR(base));
+                outb(0x09, CIR_IER(base));
+        }
+
+        printk(KERN_INFO PFX "Chip it%04x revision %d initialized. "
+                "timeout=%d sec (nowayout=%d testmode=%d exclusive=%d "
+                "nogameport=%d)\n", chip_type, chip_rev, timeout,
+                nowayout, testmode, exclusive, nogameport);
+
+        return 0;
+
+err_out_reboot:
+        unregister_reboot_notifier(&wdt_notifier);
+err_out_region:
+        release_region(base, test_bit(WDTS_USE_GP, &wdt_status) ? 1 : 8);
+        if (!test_bit(WDTS_USE_GP, &wdt_status)) {
+                spin_lock_irqsave(&spinlock, flags);
+                superio_enter();
+                superio_select(CIR);
+                superio_outb(ciract, ACTREG);
+                superio_exit();
+                spin_unlock_irqrestore(&spinlock, flags);
+        }
+err_out:
+        if (chip_type != IT8718_ID && !nogameport) {
+                spin_lock_irqsave(&spinlock, flags);
+                superio_enter();
+                superio_select(GAMEPORT);
+                superio_outb(gpact, ACTREG);
+                superio_exit();
+                spin_unlock_irqrestore(&spinlock, flags);
+        }
+
+        return rc;
+}
+
+static void __exit it87_wdt_exit(void)
+{
+        unsigned long flags;
+        int nolock;
+
+        nolock = !spin_trylock_irqsave(&spinlock, flags);
+        superio_enter();
+        superio_select(GPIO);
+        superio_outb(0x00, WDTCTRL);
+        superio_outb(0x00, WDTCFG);
+        superio_outb(0x00, WDTVALMSB);
+        superio_outb(0x00, WDTVALLSB);
+        if (test_bit(WDTS_USE_GP, &wdt_status)) {
+                superio_select(GAMEPORT);
+                superio_outb(gpact, ACTREG);
+        } else {
+                superio_select(CIR);
+                superio_outb(ciract, ACTREG);
+        }
+        superio_exit();
+        if (!nolock)
+                spin_unlock_irqrestore(&spinlock, flags);
+
+        misc_deregister(&wdt_miscdev);
+        unregister_reboot_notifier(&wdt_notifier);
+        release_region(base, test_bit(WDTS_USE_GP, &wdt_status) ? 1 : 8);
+}
+
+module_init(it87_wdt_init);
+module_exit(it87_wdt_exit);
+
+MODULE_AUTHOR("Oliver Schuster");
+MODULE_DESCRIPTION("Hardware Watchdog Device Driver for IT87xx EC-LPC I/O");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);