drivers/watchdog/it87_wdt.c

   1 /*
   2  *      Watchdog Timer Driver
   3  *         for ITE IT87xx Environment Control - Low Pin Count Input / Output
   4  *
   5  *      (c) Copyright 2007  Oliver Schuster <olivers137@aol.com>
   6  *
   7  *      Based on softdog.c      by Alan Cox,
   8  *               83977f_wdt.c   by Jose Goncalves,
   9  *               it87.c         by Chris Gauthron, Jean Delvare
  10  *
  11  *      Data-sheets: Publicly available at the ITE website
  12  *                  http://www.ite.com.tw/
  13  *
  14  *      Support of the watchdog timers, which are available on
  15  *      IT8716, IT8718, IT8726 and IT8712 (J,K version).
  16  *
  17  *      This program is free software; you can redistribute it and/or
  18  *      modify it under the terms of the GNU General Public License
  19  *      as published by the Free Software Foundation; either version
  20  *      2 of the License, or (at your option) any later version.
  21  *
  22  *      This program is distributed in the hope that it will be useful,
  23  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  *      GNU General Public License for more details.
  26  *
  27  *      You should have received a copy of the GNU General Public License
  28  *      along with this program; if not, write to the Free Software
  29  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  30  */
  31
  32 #include <linux/module.h>
  33 #include <linux/moduleparam.h>
  34 #include <linux/types.h>
  35 #include <linux/kernel.h>
  36 #include <linux/fs.h>
  37 #include <linux/miscdevice.h>
  38 #include <linux/init.h>
  39 #include <linux/ioport.h>
  40 #include <linux/watchdog.h>
  41 #include <linux/notifier.h>
  42 #include <linux/reboot.h>
  43 #include <linux/uaccess.h>
  44 #include <linux/io.h>
  45
  46 #include <asm/system.h>
  47
  48 #define WATCHDOG_VERSION        "1.12"
  49 #define WATCHDOG_NAME           "IT87 WDT"
  50 #define PFX                     WATCHDOG_NAME ": "
  51 #define DRIVER_VERSION          WATCHDOG_NAME " driver, v" WATCHDOG_VERSION "\n"
  52 #define WD_MAGIC                'V'
  53
  54 /* Defaults for Module Parameter */
  55 #define DEFAULT_NOGAMEPORT      0
  56 #define DEFAULT_EXCLUSIVE       1
  57 #define DEFAULT_TIMEOUT         60
  58 #define DEFAULT_TESTMODE        0
  59 #define DEFAULT_NOWAYOUT        WATCHDOG_NOWAYOUT
  60
  61 /* IO Ports */
  62 #define REG             0x2e
  63 #define VAL             0x2f
  64
  65 /* Logical device Numbers LDN */
  66 #define GPIO            0x07
  67 #define GAMEPORT        0x09
  68 #define CIR             0x0a
  69
  70 /* Configuration Registers and Functions */
  71 #define LDNREG          0x07
  72 #define CHIPID          0x20
  73 #define CHIPREV         0x22
  74 #define ACTREG          0x30
  75 #define BASEREG         0x60
  76
  77 /* Chip Id numbers */
  78 #define NO_DEV_ID       0xffff
  79 #define IT8705_ID       0x8705
  80 #define IT8712_ID       0x8712
  81 #define IT8716_ID       0x8716
  82 #define IT8718_ID       0x8718
  83 #define IT8726_ID       0x8726  /* the data sheet suggest wrongly 0x8716 */
  84
  85 /* GPIO Configuration Registers LDN=0x07 */
  86 #define WDTCTRL         0x71
  87 #define WDTCFG          0x72
  88 #define WDTVALLSB       0x73
  89 #define WDTVALMSB       0x74
  90
  91 /* GPIO Bits WDTCTRL */
  92 #define WDT_CIRINT      0x80
  93 #define WDT_MOUSEINT    0x40
  94 #define WDT_KYBINT      0x20
  95 #define WDT_GAMEPORT    0x10 /* not it8718 */
  96 #define WDT_FORCE       0x02
  97 #define WDT_ZERO        0x01
  98
  99 /* GPIO Bits WDTCFG */
 100 #define WDT_TOV1        0x80
 101 #define WDT_KRST        0x40
 102 #define WDT_TOVE        0x20
 103 #define WDT_PWROK       0x10
 104 #define WDT_INT_MASK    0x0f
 105
 106 /* CIR Configuration Register LDN=0x0a */
 107 #define CIR_ILS         0x70
 108
 109 /* The default Base address is not always available, we use this */
 110 #define CIR_BASE        0x0208
 111
 112 /* CIR Controller */
 113 #define CIR_DR(b)       (b)
 114 #define CIR_IER(b)      (b + 1)
 115 #define CIR_RCR(b)      (b + 2)
 116 #define CIR_TCR1(b)     (b + 3)
 117 #define CIR_TCR2(b)     (b + 4)
 118 #define CIR_TSR(b)      (b + 5)
 119 #define CIR_RSR(b)      (b + 6)
 120 #define CIR_BDLR(b)     (b + 5)
 121 #define CIR_BDHR(b)     (b + 6)
 122 #define CIR_IIR(b)      (b + 7)
 123
 124 /* Default Base address of Game port */
 125 #define GP_BASE_DEFAULT 0x0201
 126
 127 /* wdt_status */
 128 #define WDTS_TIMER_RUN  0
 129 #define WDTS_DEV_OPEN   1
 130 #define WDTS_KEEPALIVE  2
 131 #define WDTS_LOCKED     3
 132 #define WDTS_USE_GP     4
 133 #define WDTS_EXPECTED   5
 134
 135 static  unsigned int base, gpact, ciract;
 136 static  unsigned long wdt_status;
 137 static  DEFINE_SPINLOCK(spinlock);
 138
 139 static  int nogameport = DEFAULT_NOGAMEPORT;
 140 static  int exclusive  = DEFAULT_EXCLUSIVE;
 141 static  int timeout    = DEFAULT_TIMEOUT;
 142 static  int testmode   = DEFAULT_TESTMODE;
 143 static  int nowayout   = DEFAULT_NOWAYOUT;
 144
 145 module_param(nogameport, int, 0);
 146 MODULE_PARM_DESC(nogameport, "Forbid the activation of game port, default="
 147                 __MODULE_STRING(DEFAULT_NOGAMEPORT));
 148 module_param(exclusive, int, 0);
 149 MODULE_PARM_DESC(exclusive, "Watchdog exclusive device open, default="
 150                 __MODULE_STRING(DEFAULT_EXCLUSIVE));
 151 module_param(timeout, int, 0);
 152 MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds, default="
 153                 __MODULE_STRING(DEFAULT_TIMEOUT));
 154 module_param(testmode, int, 0);
 155 MODULE_PARM_DESC(testmode, "Watchdog test mode (1 = no reboot), default="
 156                 __MODULE_STRING(DEFAULT_TESTMODE));
 157 module_param(nowayout, int, 0);
 158 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started, default="
 159                 __MODULE_STRING(WATCHDOG_NOWAYOUT));
 160
 161 /* Superio Chip */
 162
 163 static inline void superio_enter(void)
 164 {
 165         outb(0x87, REG);
 166         outb(0x01, REG);
 167         outb(0x55, REG);
 168         outb(0x55, REG);
 169 }
 170
 171 static inline void superio_exit(void)
 172 {
 173         outb(0x02, REG);
 174         outb(0x02, VAL);
 175 }
 176
 177 static inline void superio_select(int ldn)
 178 {
 179         outb(LDNREG, REG);
 180         outb(ldn, VAL);
 181 }
 182
 183 static inline int superio_inb(int reg)
 184 {
 185         outb(reg, REG);
 186         return inb(VAL);
 187 }
 188
 189 static inline void superio_outb(int val, int reg)
 190 {
 191         outb(reg, REG);
 192         outb(val, VAL);
 193 }
 194
 195 static inline int superio_inw(int reg)
 196 {
 197         int val;
 198         outb(reg++, REG);
 199         val = inb(VAL) << 8;
 200         outb(reg, REG);
 201         val |= inb(VAL);
 202         return val;
 203 }
 204
 205 static inline void superio_outw(int val, int reg)
 206 {
 207         outb(reg++, REG);
 208         outb(val >> 8, VAL);
 209         outb(reg, REG);
 210         outb(val, VAL);
 211 }
 212
 213 /* watchdog timer handling */
 214
 215 static void wdt_keepalive(void)
 216 {
 217         if (test_bit(WDTS_USE_GP, &wdt_status))
 218                 inb(base);
 219         else
 220                 /* The timer reloads with around 5 msec delay */
 221                 outb(0x55, CIR_DR(base));
 222         set_bit(WDTS_KEEPALIVE, &wdt_status);
 223 }
 224
 225 static void wdt_start(void)
 226 {
 227         unsigned long flags;
 228
 229         spin_lock_irqsave(&spinlock, flags);
 230         superio_enter();
 231
 232         superio_select(GPIO);
 233         if (test_bit(WDTS_USE_GP, &wdt_status))
 234                 superio_outb(WDT_GAMEPORT, WDTCTRL);
 235         else
 236                 superio_outb(WDT_CIRINT, WDTCTRL);
 237         if (!testmode)
 238                 superio_outb(WDT_TOV1 | WDT_KRST | WDT_PWROK, WDTCFG);
 239         else
 240                 superio_outb(WDT_TOV1, WDTCFG);
 241         superio_outb(timeout>>8, WDTVALMSB);
 242         superio_outb(timeout, WDTVALLSB);
 243
 244         superio_exit();
 245         spin_unlock_irqrestore(&spinlock, flags);
 246 }
 247
 248 static void wdt_stop(void)
 249 {
 250         unsigned long flags;
 251
 252         spin_lock_irqsave(&spinlock, flags);
 253         superio_enter();
 254
 255         superio_select(GPIO);
 256         superio_outb(0x00, WDTCTRL);
 257         superio_outb(WDT_TOV1, WDTCFG);
 258         superio_outb(0x00, WDTVALMSB);
 259         superio_outb(0x00, WDTVALLSB);
 260
 261         superio_exit();
 262         spin_unlock_irqrestore(&spinlock, flags);
 263 }
 264
 265 /**
 266  *      wdt_set_timeout - set a new timeout value with watchdog ioctl
 267  *      @t: timeout value in seconds
 268  *
 269  *      The hardware device has a 16 bit watchdog timer, thus the
 270  *      timeout time ranges between 1 and 65535 seconds.
 271  *
 272  *      Used within WDIOC_SETTIMEOUT watchdog device ioctl.
 273  */
 274
 275 static int wdt_set_timeout(int t)
 276 {
 277         unsigned long flags;
 278
 279         if (t < 1 || t > 65535)
 280                 return -EINVAL;
 281
 282         timeout = t;
 283
 284         spin_lock_irqsave(&spinlock, flags);
 285         if (test_bit(WDTS_TIMER_RUN, &wdt_status)) {
 286                 superio_enter();
 287
 288                 superio_select(GPIO);
 289                 superio_outb(t>>8, WDTVALMSB);
 290                 superio_outb(t, WDTVALLSB);
 291
 292                 superio_exit();
 293         }
 294         spin_unlock_irqrestore(&spinlock, flags);
 295         return 0;
 296 }
 297
 298 /**
 299  *      wdt_get_status - determines the status supported by watchdog ioctl
 300  *      @status: status returned to user space
 301  *
 302  *      The status bit of the device does not allow to distinguish
 303  *      between a regular system reset and a watchdog forced reset.
 304  *      But, in test mode it is useful, so it is supported through
 305  *      WDIOC_GETSTATUS watchdog ioctl. Additionally the driver
 306  *      reports the keepalive signal and the acception of the magic.
 307  *
 308  *      Used within WDIOC_GETSTATUS watchdog device ioctl.
 309  */
 310
 311 static int wdt_get_status(int *status)
 312 {
 313         unsigned long flags;
 314
 315         *status = 0;
 316         if (testmode) {
 317                 spin_lock_irqsave(&spinlock, flags);
 318                 superio_enter();
 319                 superio_select(GPIO);
 320                 if (superio_inb(WDTCTRL) & WDT_ZERO) {
 321                         superio_outb(0x00, WDTCTRL);
 322                         clear_bit(WDTS_TIMER_RUN, &wdt_status);
 323                         *status |= WDIOF_CARDRESET;
 324                 }
 325
 326                 superio_exit();
 327                 spin_unlock_irqrestore(&spinlock, flags);
 328         }
 329         if (test_and_clear_bit(WDTS_KEEPALIVE, &wdt_status))
 330                 *status |= WDIOF_KEEPALIVEPING;
 331         if (test_bit(WDTS_EXPECTED, &wdt_status))
 332                 *status |= WDIOF_MAGICCLOSE;
 333         return 0;
 334 }
 335
 336 /* /dev/watchdog handling */
 337
 338 /**
 339  *      wdt_open - watchdog file_operations .open
 340  *      @inode: inode of the device
 341  *      @file: file handle to the device
 342  *
 343  *      The watchdog timer starts by opening the device.
 344  *
 345  *      Used within the file operation of the watchdog device.
 346  */
 347
 348 static int wdt_open(struct inode *inode, struct file *file)
 349 {
 350         if (exclusive && test_and_set_bit(WDTS_DEV_OPEN, &wdt_status))
 351                 return -EBUSY;
 352         if (!test_and_set_bit(WDTS_TIMER_RUN, &wdt_status)) {
 353                 if (nowayout && !test_and_set_bit(WDTS_LOCKED, &wdt_status))
 354                         __module_get(THIS_MODULE);
 355                 wdt_start();
 356         }
 357         return nonseekable_open(inode, file);
 358 }
 359
 360 /**
 361  *      wdt_release - watchdog file_operations .release
 362  *      @inode: inode of the device
 363  *      @file: file handle to the device
 364  *
 365  *      Closing the watchdog device either stops the watchdog timer
 366  *      or in the case, that nowayout is set or the magic character
 367  *      wasn't written, a critical warning about an running watchdog
 368  *      timer is given.
 369  *
 370  *      Used within the file operation of the watchdog device.
 371  */
 372
 373 static int wdt_release(struct inode *inode, struct file *file)
 374 {
 375         if (test_bit(WDTS_TIMER_RUN, &wdt_status)) {
 376                 if (test_and_clear_bit(WDTS_EXPECTED, &wdt_status)) {
 377                         wdt_stop();
 378                         clear_bit(WDTS_TIMER_RUN, &wdt_status);
 379                 } else {
 380                         wdt_keepalive();
 381                         printk(KERN_CRIT PFX
 382                                "unexpected close, not stopping watchdog!\n");
 383                 }
 384         }
 385         clear_bit(WDTS_DEV_OPEN, &wdt_status);
 386         return 0;
 387 }
 388
 389 /**
 390  *      wdt_write - watchdog file_operations .write
 391  *      @file: file handle to the watchdog
 392  *      @buf: buffer to write
 393  *      @count: count of bytes
 394  *      @ppos: pointer to the position to write. No seeks allowed
 395  *
 396  *      A write to a watchdog device is defined as a keepalive signal. Any
 397  *      write of data will do, as we don't define content meaning.
 398  *
 399  *      Used within the file operation of the watchdog device.
 400  */
 401
 402 static ssize_t wdt_write(struct file *file, const char __user *buf,
 403                             size_t count, loff_t *ppos)
 404 {
 405         if (count) {
 406                 clear_bit(WDTS_EXPECTED, &wdt_status);
 407                 wdt_keepalive();
 408         }
 409         if (!nowayout) {
 410                 size_t ofs;
 411
 412         /* note: just in case someone wrote the magic character long ago */
 413                 for (ofs = 0; ofs != count; ofs++) {
 414                         char c;
 415                         if (get_user(c, buf + ofs))
 416                                 return -EFAULT;
 417                         if (c == WD_MAGIC)
 418                                 set_bit(WDTS_EXPECTED, &wdt_status);
 419                 }
 420         }
 421         return count;
 422 }
 423
 424 static struct watchdog_info ident = {
 425         .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
 426         .firmware_version =     1,
 427         .identity = WATCHDOG_NAME,
 428 };
 429
 430 /**
 431  *      wdt_ioctl - watchdog file_operations .unlocked_ioctl
 432  *      @file: file handle to the device
 433  *      @cmd: watchdog command
 434  *      @arg: argument pointer
 435  *
 436  *      The watchdog API defines a common set of functions for all watchdogs
 437  *      according to their available features.
 438  *
 439  *      Used within the file operation of the watchdog device.
 440  */
 441
 442 static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 443 {
 444         int rc = 0, status, new_options, new_timeout;
 445         union {
 446                 struct watchdog_info __user *ident;
 447                 int __user *i;
 448         } uarg;
 449
 450         uarg.i = (int __user *)arg;
 451
 452         switch (cmd) {
 453         case WDIOC_GETSUPPORT:
 454                 return copy_to_user(uarg.ident,
 455                                     &ident, sizeof(ident)) ? -EFAULT : 0;
 456
 457         case WDIOC_GETSTATUS:
 458                 wdt_get_status(&status);
 459                 return put_user(status, uarg.i);
 460
 461         case WDIOC_GETBOOTSTATUS:
 462                 return put_user(0, uarg.i);
 463
 464         case WDIOC_KEEPALIVE:
 465                 wdt_keepalive();
 466                 return 0;
 467
 468         case WDIOC_SETOPTIONS:
 469                 if (get_user(new_options, uarg.i))
 470                         return -EFAULT;
 471
 472                 switch (new_options) {
 473                 case WDIOS_DISABLECARD:
 474                         if (test_bit(WDTS_TIMER_RUN, &wdt_status))
 475                                 wdt_stop();
 476                         clear_bit(WDTS_TIMER_RUN, &wdt_status);
 477                         return 0;
 478
 479                 case WDIOS_ENABLECARD:
 480                         if (!test_and_set_bit(WDTS_TIMER_RUN, &wdt_status))
 481                                 wdt_start();
 482                         return 0;
 483
 484                 default:
 485                         return -EFAULT;
 486                 }
 487
 488         case WDIOC_SETTIMEOUT:
 489                 if (get_user(new_timeout, uarg.i))
 490                         return -EFAULT;
 491                 rc = wdt_set_timeout(new_timeout);
 492         case WDIOC_GETTIMEOUT:
 493                 if (put_user(timeout, uarg.i))
 494                         return -EFAULT;
 495                 return rc;
 496
 497         default:
 498                 return -ENOTTY;
 499         }
 500 }
 501
 502 static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
 503         void *unused)
 504 {
 505         if (code == SYS_DOWN || code == SYS_HALT)
 506                 wdt_stop();
 507         return NOTIFY_DONE;
 508 }
 509
 510 static const struct file_operations wdt_fops = {
 511         .owner          = THIS_MODULE,
 512         .llseek         = no_llseek,
 513         .write          = wdt_write,
 514         .unlocked_ioctl = wdt_ioctl,
 515         .open           = wdt_open,
 516         .release        = wdt_release,
 517 };
 518
 519 static struct miscdevice wdt_miscdev = {
 520         .minor          = WATCHDOG_MINOR,
 521         .name           = "watchdog",
 522         .fops           = &wdt_fops,
 523 };
 524
 525 static struct notifier_block wdt_notifier = {
 526         .notifier_call = wdt_notify_sys,
 527 };
 528
 529 static int __init it87_wdt_init(void)
 530 {
 531         int rc = 0;
 532         u16 chip_type;
 533         u8  chip_rev;
 534         unsigned long flags;
 535
 536         spin_lock_irqsave(&spinlock, flags);
 537         superio_enter();
 538         chip_type = superio_inw(CHIPID);
 539         chip_rev  = superio_inb(CHIPREV) & 0x0f;
 540         superio_exit();
 541         spin_unlock_irqrestore(&spinlock, flags);
 542
 543         switch (chip_type) {
 544         case IT8716_ID:
 545         case IT8718_ID:
 546         case IT8726_ID:
 547                 break;
 548         case IT8712_ID:
 549                 if (chip_rev > 7)
 550                         break;
 551         case IT8705_ID:
 552                 printk(KERN_ERR PFX
 553                        "Unsupported Chip found, Chip %04x Revision %02x\n",
 554                        chip_type, chip_rev);
 555                 return -ENODEV;
 556         case NO_DEV_ID:
 557                 printk(KERN_ERR PFX "no device\n");
 558                 return -ENODEV;
 559         default:
 560                 printk(KERN_ERR PFX
 561                        "Unknown Chip found, Chip %04x Revision %04x\n",
 562                        chip_type, chip_rev);
 563                 return -ENODEV;
 564         }
 565
 566         spin_lock_irqsave(&spinlock, flags);
 567         superio_enter();
 568
 569         superio_select(GPIO);
 570         superio_outb(WDT_TOV1, WDTCFG);
 571         superio_outb(0x00, WDTCTRL);
 572
 573         /* First try to get Gameport support */
 574         if (chip_type != IT8718_ID && !nogameport) {
 575                 superio_select(GAMEPORT);
 576                 base = superio_inw(BASEREG);
 577                 if (!base) {
 578                         base = GP_BASE_DEFAULT;
 579                         superio_outw(base, BASEREG);
 580                 }
 581                 gpact = superio_inb(ACTREG);
 582                 superio_outb(0x01, ACTREG);
 583                 superio_exit();
 584                 spin_unlock_irqrestore(&spinlock, flags);
 585                 if (request_region(base, 1, WATCHDOG_NAME))
 586                         set_bit(WDTS_USE_GP, &wdt_status);
 587                 else
 588                         rc = -EIO;
 589         } else {
 590                 superio_exit();
 591                 spin_unlock_irqrestore(&spinlock, flags);
 592         }
 593
 594         /* If we haven't Gameport support, try to get CIR support */
 595         if (!test_bit(WDTS_USE_GP, &wdt_status)) {
 596                 if (!request_region(CIR_BASE, 8, WATCHDOG_NAME)) {
 597                         if (rc == -EIO)
 598                                 printk(KERN_ERR PFX
 599                                         "I/O Address 0x%04x and 0x%04x"
 600                                         " already in use\n", base, CIR_BASE);
 601                         else
 602                                 printk(KERN_ERR PFX
 603                                         "I/O Address 0x%04x already in use\n",
 604                                         CIR_BASE);
 605                         rc = -EIO;
 606                         goto err_out;
 607                 }
 608                 base = CIR_BASE;
 609                 spin_lock_irqsave(&spinlock, flags);
 610                 superio_enter();
 611
 612                 superio_select(CIR);
 613                 superio_outw(base, BASEREG);
 614                 superio_outb(0x00, CIR_ILS);
 615                 ciract = superio_inb(ACTREG);
 616                 superio_outb(0x01, ACTREG);
 617                 if (rc == -EIO) {
 618                         superio_select(GAMEPORT);
 619                         superio_outb(gpact, ACTREG);
 620                 }
 621
 622                 superio_exit();
 623                 spin_unlock_irqrestore(&spinlock, flags);
 624         }
 625
 626         if (timeout < 1 || timeout > 65535) {
 627                 timeout = DEFAULT_TIMEOUT;
 628                 printk(KERN_WARNING PFX
 629                        "Timeout value out of range, use default %d sec\n",
 630                        DEFAULT_TIMEOUT);
 631         }
 632
 633         rc = register_reboot_notifier(&wdt_notifier);
 634         if (rc) {
 635                 printk(KERN_ERR PFX
 636                        "Cannot register reboot notifier (err=%d)\n", rc);
 637                 goto err_out_region;
 638         }
 639
 640         rc = misc_register(&wdt_miscdev);
 641         if (rc) {
 642                 printk(KERN_ERR PFX
 643                        "Cannot register miscdev on minor=%d (err=%d)\n",
 644                         wdt_miscdev.minor, rc);
 645                 goto err_out_reboot;
 646         }
 647
 648         /* Initialize CIR to use it as keepalive source */
 649         if (!test_bit(WDTS_USE_GP, &wdt_status)) {
 650                 outb(0x00, CIR_RCR(base));
 651                 outb(0xc0, CIR_TCR1(base));
 652                 outb(0x5c, CIR_TCR2(base));
 653                 outb(0x10, CIR_IER(base));
 654                 outb(0x00, CIR_BDHR(base));
 655                 outb(0x01, CIR_BDLR(base));
 656                 outb(0x09, CIR_IER(base));
 657         }
 658
 659         printk(KERN_INFO PFX "Chip it%04x revision %d initialized. "
 660                 "timeout=%d sec (nowayout=%d testmode=%d exclusive=%d "
 661                 "nogameport=%d)\n", chip_type, chip_rev, timeout,
 662                 nowayout, testmode, exclusive, nogameport);
 663
 664         return 0;
 665
 666 err_out_reboot:
 667         unregister_reboot_notifier(&wdt_notifier);
 668 err_out_region:
 669         release_region(base, test_bit(WDTS_USE_GP, &wdt_status) ? 1 : 8);
 670         if (!test_bit(WDTS_USE_GP, &wdt_status)) {
 671                 spin_lock_irqsave(&spinlock, flags);
 672                 superio_enter();
 673                 superio_select(CIR);
 674                 superio_outb(ciract, ACTREG);
 675                 superio_exit();
 676                 spin_unlock_irqrestore(&spinlock, flags);
 677         }
 678 err_out:
 679         if (chip_type != IT8718_ID && !nogameport) {
 680                 spin_lock_irqsave(&spinlock, flags);
 681                 superio_enter();
 682                 superio_select(GAMEPORT);
 683                 superio_outb(gpact, ACTREG);
 684                 superio_exit();
 685                 spin_unlock_irqrestore(&spinlock, flags);
 686         }
 687
 688         return rc;
 689 }
 690
 691 static void __exit it87_wdt_exit(void)
 692 {
 693         unsigned long flags;
 694         int nolock;
 695
 696         nolock = !spin_trylock_irqsave(&spinlock, flags);
 697         superio_enter();
 698         superio_select(GPIO);
 699         superio_outb(0x00, WDTCTRL);
 700         superio_outb(0x00, WDTCFG);
 701         superio_outb(0x00, WDTVALMSB);
 702         superio_outb(0x00, WDTVALLSB);
 703         if (test_bit(WDTS_USE_GP, &wdt_status)) {
 704                 superio_select(GAMEPORT);
 705                 superio_outb(gpact, ACTREG);
 706         } else {
 707                 superio_select(CIR);
 708                 superio_outb(ciract, ACTREG);
 709         }
 710         superio_exit();
 711         if (!nolock)
 712                 spin_unlock_irqrestore(&spinlock, flags);
 713
 714         misc_deregister(&wdt_miscdev);
 715         unregister_reboot_notifier(&wdt_notifier);
 716         release_region(base, test_bit(WDTS_USE_GP, &wdt_status) ? 1 : 8);
 717 }
 718
 719 module_init(it87_wdt_init);
 720 module_exit(it87_wdt_exit);
 721
 722 MODULE_AUTHOR("Oliver Schuster");
 723 MODULE_DESCRIPTION("Hardware Watchdog Device Driver for IT87xx EC-LPC I/O");
 724 MODULE_LICENSE("GPL");
 725 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);