drivers/char/watchdog/pcwd_pci.c

   1 /*
   2  *      Berkshire PCI-PC Watchdog Card Driver
   3  *
   4  *      (c) Copyright 2003 Wim Van Sebroeck <wim@iguana.be>.
   5  *
   6  *      Based on source code of the following authors:
   7  *        Ken Hollis <kenji@bitgate.com>,
   8  *        Lindsay Harris <lindsay@bluegum.com>,
   9  *        Alan Cox <alan@redhat.com>,
  10  *        Matt Domsch <Matt_Domsch@dell.com>,
  11  *        Rob Radez <rob@osinvestor.com>
  12  *
  13  *      This program is free software; you can redistribute it and/or
  14  *      modify it under the terms of the GNU General Public License
  15  *      as published by the Free Software Foundation; either version
  16  *      2 of the License, or (at your option) any later version.
  17  *
  18  *      Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
  19  *      provide warranty for any of this software. This material is
  20  *      provided "AS-IS" and at no charge.
  21  */
  22
  23 /*
  24  *      A bells and whistles driver is available from http://www.pcwd.de/
  25  *      More info available at http://www.berkprod.com/ or http://www.pcwatchdog.com/
  26  */
  27
  28 /*
  29  *      Includes, defines, variables, module parameters, ...
  30  */
  31
  32 #include <linux/config.h>
  33 #include <linux/module.h>
  34 #include <linux/moduleparam.h>
  35 #include <linux/types.h>
  36 #include <linux/delay.h>
  37 #include <linux/miscdevice.h>
  38 #include <linux/watchdog.h>
  39 #include <linux/notifier.h>
  40 #include <linux/reboot.h>
  41 #include <linux/init.h>
  42 #include <linux/fs.h>
  43 #include <linux/pci.h>
  44 #include <linux/ioport.h>
  45 #include <linux/spinlock.h>
  46
  47 #include <asm/uaccess.h>
  48 #include <asm/io.h>
  49
  50 /* Module and version information */
  51 #define WATCHDOG_VERSION "1.00"
  52 #define WATCHDOG_DATE "12 Jun 2004"
  53 #define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog"
  54 #define WATCHDOG_NAME "pcwd_pci"
  55 #define PFX WATCHDOG_NAME ": "
  56 #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION " (" WATCHDOG_DATE ")\n"
  57
  58 /* Stuff for the PCI ID's  */
  59 #ifndef PCI_VENDOR_ID_QUICKLOGIC
  60 #define PCI_VENDOR_ID_QUICKLOGIC    0x11e3
  61 #endif
  62
  63 #ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD
  64 #define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030
  65 #endif
  66
  67 /*
  68  * These are the defines that describe the control status bits for the
  69  * PCI-PC Watchdog card.
  70  */
  71 #define WD_PCI_WTRP             0x01    /* Watchdog Trip status */
  72 #define WD_PCI_HRBT             0x02    /* Watchdog Heartbeat */
  73 #define WD_PCI_TTRP             0x04    /* Temperature Trip status */
  74
  75 /* according to documentation max. time to process a command for the pci
  76  * watchdog card is 100 ms, so we give it 150 ms to do it's job */
  77 #define PCI_COMMAND_TIMEOUT     150
  78
  79 /* Watchdog's internal commands */
  80 #define CMD_GET_STATUS                  0x04
  81 #define CMD_GET_FIRMWARE_VERSION        0x08
  82 #define CMD_READ_WATCHDOG_TIMEOUT       0x18
  83 #define CMD_WRITE_WATCHDOG_TIMEOUT      0x19
  84
  85 /* We can only use 1 card due to the /dev/watchdog restriction */
  86 static int cards_found;
  87
  88 /* internal variables */
  89 static int temp_panic;
  90 static unsigned long is_active;
  91 static char expect_release;
  92 static struct {
  93         int supports_temp;      /* Wether or not the card has a temperature device */
  94         int boot_status;        /* The card's boot status */
  95         unsigned long io_addr;  /* The cards I/O address */
  96         spinlock_t io_lock;
  97         struct pci_dev *pdev;
  98 } pcipcwd_private;
  99
 100 /* module parameters */
 101 #define WATCHDOG_HEARTBEAT 2    /* 2 sec default heartbeat */
 102 static int heartbeat = WATCHDOG_HEARTBEAT;
 103 module_param(heartbeat, int, 0);
 104 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
 105
 106 #ifdef CONFIG_WATCHDOG_NOWAYOUT
 107 static int nowayout = 1;
 108 #else
 109 static int nowayout = 0;
 110 #endif
 111
 112 module_param(nowayout, int, 0);
 113 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
 114
 115 /*
 116  *      Internal functions
 117  */
 118
 119 static int send_command(int cmd, int *msb, int *lsb)
 120 {
 121         int got_response, count;
 122
 123         spin_lock(&pcipcwd_private.io_lock);
 124         /* If a command requires data it should be written first.
 125          * Data for commands with 8 bits of data should be written to port 4.
 126          * Commands with 16 bits of data, should be written as LSB to port 4
 127          * and MSB to port 5.
 128          * After the required data has been written then write the command to
 129          * port 6. */
 130         outb_p(*lsb, pcipcwd_private.io_addr + 4);
 131         outb_p(*msb, pcipcwd_private.io_addr + 5);
 132         outb_p(cmd, pcipcwd_private.io_addr + 6);
 133
 134         /* wait till the pci card processed the command, signaled by
 135          * the WRSP bit in port 2 and give it a max. timeout of
 136          * PCI_COMMAND_TIMEOUT to process */
 137         got_response = inb_p(pcipcwd_private.io_addr + 2) & 0x40;
 138         for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response); count++) {
 139                 mdelay(1);
 140                 got_response = inb_p(pcipcwd_private.io_addr + 2) & 0x40;
 141         }
 142
 143         if (got_response) {
 144                 /* read back response */
 145                 *lsb = inb_p(pcipcwd_private.io_addr + 4);
 146                 *msb = inb_p(pcipcwd_private.io_addr + 5);
 147
 148                 /* clear WRSP bit */
 149                 inb_p(pcipcwd_private.io_addr + 6);
 150         }
 151         spin_unlock(&pcipcwd_private.io_lock);
 152
 153         return got_response;
 154 }
 155
 156 static int pcipcwd_start(void)
 157 {
 158         int stat_reg;
 159
 160         spin_lock(&pcipcwd_private.io_lock);
 161         outb_p(0x00, pcipcwd_private.io_addr + 3);
 162         udelay(1000);
 163
 164         stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 165         spin_unlock(&pcipcwd_private.io_lock);
 166
 167         if (stat_reg & 0x10) {
 168                 printk(KERN_ERR PFX "Card timer not enabled\n");
 169                 return -1;
 170         }
 171
 172         return 0;
 173 }
 174
 175 static int pcipcwd_stop(void)
 176 {
 177         int stat_reg;
 178
 179         spin_lock(&pcipcwd_private.io_lock);
 180         outb_p(0xA5, pcipcwd_private.io_addr + 3);
 181         udelay(1000);
 182
 183         outb_p(0xA5, pcipcwd_private.io_addr + 3);
 184         udelay(1000);
 185
 186         stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 187         spin_unlock(&pcipcwd_private.io_lock);
 188
 189         if (!(stat_reg & 0x10)) {
 190                 printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
 191                 return -1;
 192         }
 193
 194         return 0;
 195 }
 196
 197 static int pcipcwd_keepalive(void)
 198 {
 199         /* Re-trigger watchdog by writing to port 0 */
 200         outb_p(0x42, pcipcwd_private.io_addr);
 201         return 0;
 202 }
 203
 204 static int pcipcwd_set_heartbeat(int t)
 205 {
 206         int t_msb = t / 256;
 207         int t_lsb = t % 256;
 208
 209         if ((t < 0x0001) || (t > 0xFFFF))
 210                 return -EINVAL;
 211
 212         /* Write new heartbeat to watchdog */
 213         send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
 214
 215         heartbeat = t;
 216         return 0;
 217 }
 218
 219 static int pcipcwd_get_status(int *status)
 220 {
 221         int new_status;
 222
 223         *status=0;
 224         new_status = inb_p(pcipcwd_private.io_addr + 1);
 225         if (new_status & WD_PCI_WTRP)
 226                 *status |= WDIOF_CARDRESET;
 227         if (new_status & WD_PCI_TTRP) {
 228                 *status |= WDIOF_OVERHEAT;
 229                 if (temp_panic)
 230                         panic(PFX "Temperature overheat trip!\n");
 231         }
 232
 233         return 0;
 234 }
 235
 236 static int pcipcwd_clear_status(void)
 237 {
 238         outb_p(0x01, pcipcwd_private.io_addr + 1);
 239         return 0;
 240 }
 241
 242 static int pcipcwd_get_temperature(int *temperature)
 243 {
 244         *temperature = 0;
 245         if (!pcipcwd_private.supports_temp)
 246                 return -ENODEV;
 247
 248         /*
 249          * Convert celsius to fahrenheit, since this was
 250          * the decided 'standard' for this return value.
 251          */
 252         *temperature = ((inb_p(pcipcwd_private.io_addr)) * 9 / 5) + 32;
 253
 254         return 0;
 255 }
 256
 257 /*
 258  *      /dev/watchdog handling
 259  */
 260
 261 static ssize_t pcipcwd_write(struct file *file, const char __user *data,
 262                               size_t len, loff_t *ppos)
 263 {
 264         /* Can't seek (pwrite) on this device  */
 265         if (ppos != &file->f_pos)
 266                 return -ESPIPE;
 267
 268         /* See if we got the magic character 'V' and reload the timer */
 269         if (len) {
 270                 if (!nowayout) {
 271                         size_t i;
 272
 273                         /* note: just in case someone wrote the magic character
 274                          * five months ago... */
 275                         expect_release = 0;
 276
 277                         /* scan to see whether or not we got the magic character */
 278                         for (i = 0; i != len; i++) {
 279                                 char c;
 280                                 if(get_user(c, data+i))
 281                                         return -EFAULT;
 282                                 if (c == 'V')
 283                                         expect_release = 42;
 284                         }
 285                 }
 286
 287                 /* someone wrote to us, we should reload the timer */
 288                 pcipcwd_keepalive();
 289         }
 290         return len;
 291 }
 292
 293 static int pcipcwd_ioctl(struct inode *inode, struct file *file,
 294                           unsigned int cmd, unsigned long arg)
 295 {
 296         void __user *argp = (void __user *)arg;
 297         int __user *p = argp;
 298         static struct watchdog_info ident = {
 299                 .options =              WDIOF_OVERHEAT |
 300                                         WDIOF_CARDRESET |
 301                                         WDIOF_KEEPALIVEPING |
 302                                         WDIOF_SETTIMEOUT |
 303                                         WDIOF_MAGICCLOSE,
 304                 .firmware_version =     1,
 305                 .identity =             WATCHDOG_DRIVER_NAME,
 306         };
 307
 308         switch (cmd) {
 309                 case WDIOC_GETSUPPORT:
 310                         return copy_to_user(argp, &ident,
 311                                 sizeof (ident)) ? -EFAULT : 0;
 312
 313                 case WDIOC_GETSTATUS:
 314                 {
 315                         int status;
 316
 317                         pcipcwd_get_status(&status);
 318
 319                         return put_user(status, p);
 320                 }
 321
 322                 case WDIOC_GETBOOTSTATUS:
 323                         return put_user(pcipcwd_private.boot_status, p);
 324
 325                 case WDIOC_GETTEMP:
 326                 {
 327                         int temperature;
 328
 329                         if (pcipcwd_get_temperature(&temperature))
 330                                 return -EFAULT;
 331
 332                         return put_user(temperature, p);
 333                 }
 334
 335                 case WDIOC_KEEPALIVE:
 336                         pcipcwd_keepalive();
 337                         return 0;
 338
 339                 case WDIOC_SETOPTIONS:
 340                 {
 341                         int new_options, retval = -EINVAL;
 342
 343                         if (get_user (new_options, p))
 344                                 return -EFAULT;
 345
 346                         if (new_options & WDIOS_DISABLECARD) {
 347                                 pcipcwd_stop();
 348                                 retval = 0;
 349                         }
 350
 351                         if (new_options & WDIOS_ENABLECARD) {
 352                                 pcipcwd_start();
 353                                 retval = 0;
 354                         }
 355
 356                         if (new_options & WDIOS_TEMPPANIC) {
 357                                 temp_panic = 1;
 358                                 retval = 0;
 359                         }
 360
 361                         return retval;
 362                 }
 363
 364                 case WDIOC_SETTIMEOUT:
 365                 {
 366                         int new_heartbeat;
 367
 368                         if (get_user(new_heartbeat, p))
 369                                 return -EFAULT;
 370
 371                         if (pcipcwd_set_heartbeat(new_heartbeat))
 372                             return -EINVAL;
 373
 374                         pcipcwd_keepalive();
 375                         /* Fall */
 376                 }
 377
 378                 case WDIOC_GETTIMEOUT:
 379                         return put_user(heartbeat, p);
 380
 381                 default:
 382                         return -ENOIOCTLCMD;
 383         }
 384 }
 385
 386 static int pcipcwd_open(struct inode *inode, struct file *file)
 387 {
 388         /* /dev/watchdog can only be opened once */
 389         if (test_and_set_bit(0, &is_active))
 390                 return -EBUSY;
 391
 392         /* Activate */
 393         pcipcwd_start();
 394         pcipcwd_keepalive();
 395         return 0;
 396 }
 397
 398 static int pcipcwd_release(struct inode *inode, struct file *file)
 399 {
 400         /*
 401          *      Shut off the timer.
 402          */
 403         if (expect_release == 42) {
 404                 pcipcwd_stop();
 405         } else {
 406                 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
 407                 pcipcwd_keepalive();
 408         }
 409         expect_release = 0;
 410         clear_bit(0, &is_active);
 411         return 0;
 412 }
 413
 414 /*
 415  *      /dev/temperature handling
 416  */
 417
 418 static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
 419                                 size_t len, loff_t *ppos)
 420 {
 421         int temperature;
 422
 423         /* Can't seek (pwrite) on this device  */
 424         if (ppos != &file->f_pos)
 425                 return -ESPIPE;
 426
 427         if (pcipcwd_get_temperature(&temperature))
 428                 return -EFAULT;
 429
 430         if (copy_to_user (data, &temperature, 1))
 431                 return -EFAULT;
 432
 433         return 1;
 434 }
 435
 436 static int pcipcwd_temp_open(struct inode *inode, struct file *file)
 437 {
 438         if (!pcipcwd_private.supports_temp)
 439                 return -ENODEV;
 440
 441         return 0;
 442 }
 443
 444 static int pcipcwd_temp_release(struct inode *inode, struct file *file)
 445 {
 446         return 0;
 447 }
 448
 449 /*
 450  *      Notify system
 451  */
 452
 453 static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
 454 {
 455         if (code==SYS_DOWN || code==SYS_HALT) {
 456                 /* Turn the WDT off */
 457                 pcipcwd_stop();
 458         }
 459
 460         return NOTIFY_DONE;
 461 }
 462
 463 /*
 464  *      Kernel Interfaces
 465  */
 466
 467 static struct file_operations pcipcwd_fops = {
 468         .owner =        THIS_MODULE,
 469         .llseek =       no_llseek,
 470         .write =        pcipcwd_write,
 471         .ioctl =        pcipcwd_ioctl,
 472         .open =         pcipcwd_open,
 473         .release =      pcipcwd_release,
 474 };
 475
 476 static struct miscdevice pcipcwd_miscdev = {
 477         .minor =        WATCHDOG_MINOR,
 478         .name =         "watchdog",
 479         .fops =         &pcipcwd_fops,
 480 };
 481
 482 static struct file_operations pcipcwd_temp_fops = {
 483         .owner =        THIS_MODULE,
 484         .llseek =       no_llseek,
 485         .read =         pcipcwd_temp_read,
 486         .open =         pcipcwd_temp_open,
 487         .release =      pcipcwd_temp_release,
 488 };
 489
 490 static struct miscdevice pcipcwd_temp_miscdev = {
 491         .minor =        TEMP_MINOR,
 492         .name =         "temperature",
 493         .fops =         &pcipcwd_temp_fops,
 494 };
 495
 496 static struct notifier_block pcipcwd_notifier = {
 497         .notifier_call =        pcipcwd_notify_sys,
 498 };
 499
 500 /*
 501  *      Init & exit routines
 502  */
 503
 504 static inline void check_temperature_support(void)
 505 {
 506         if (inb_p(pcipcwd_private.io_addr) != 0xF0)
 507                 pcipcwd_private.supports_temp = 1;
 508 }
 509
 510 static int __devinit pcipcwd_card_init(struct pci_dev *pdev,
 511                 const struct pci_device_id *ent)
 512 {
 513         int ret = -EIO;
 514         int got_fw_rev, fw_rev_major, fw_rev_minor;
 515         char fw_ver_str[20];
 516         char option_switches;
 517
 518         cards_found++;
 519         if (cards_found == 1)
 520                 printk(KERN_INFO PFX DRIVER_VERSION);
 521
 522         if (cards_found > 1) {
 523                 printk(KERN_ERR PFX "This driver only supports 1 device\n");
 524                 return -ENODEV;
 525         }
 526
 527         if (pci_enable_device(pdev)) {
 528                 printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
 529                 return -ENODEV;
 530         }
 531
 532         if (pci_resource_start(pdev, 0) == 0x0000) {
 533                 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
 534                 ret = -ENODEV;
 535                 goto err_out_disable_device;
 536         }
 537
 538         pcipcwd_private.pdev = pdev;
 539         pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
 540
 541         if (pci_request_regions(pdev, WATCHDOG_NAME)) {
 542                 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
 543                         (int) pcipcwd_private.io_addr);
 544                 ret = -EIO;
 545                 goto err_out_disable_device;
 546         }
 547
 548         /* get the boot_status */
 549         pcipcwd_get_status(&pcipcwd_private.boot_status);
 550
 551         /* clear the "card caused reboot" flag */
 552         pcipcwd_clear_status();
 553
 554         /* disable card */
 555         pcipcwd_stop();
 556
 557         /* Check whether or not the card supports the temperature device */
 558         check_temperature_support();
 559
 560         /* Get the Firmware Version */
 561         got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
 562         if (got_fw_rev) {
 563                 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
 564         } else {
 565                 sprintf(fw_ver_str, "<card no answer>");
 566         }
 567
 568         /* Get switch settings */
 569         option_switches = inb_p(pcipcwd_private.io_addr + 3);
 570
 571         printk(KERN_INFO PFX "Found card at port 0x%04x (Firmware: %s) %s temp option\n",
 572                 (int) pcipcwd_private.io_addr, fw_ver_str,
 573                 (pcipcwd_private.supports_temp ? "with" : "without"));
 574
 575         printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
 576                 option_switches,
 577                 ((option_switches & 0x10) ? "ON" : "OFF"),
 578                 ((option_switches & 0x08) ? "ON" : "OFF"));
 579
 580         if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
 581                 printk(KERN_INFO PFX "Previous reset was caused by the Watchdog card\n");
 582
 583         if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
 584                 printk(KERN_INFO PFX "Card sensed a CPU Overheat\n");
 585
 586         if (pcipcwd_private.boot_status == 0)
 587                 printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
 588
 589         /* Check that the heartbeat value is within it's range ; if not reset to the default */
 590         if (pcipcwd_set_heartbeat(heartbeat)) {
 591                 pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
 592                 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
 593                         WATCHDOG_HEARTBEAT);
 594         }
 595
 596         ret = register_reboot_notifier(&pcipcwd_notifier);
 597         if (ret != 0) {
 598                 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
 599                         ret);
 600                 goto err_out_release_region;
 601         }
 602
 603         if (pcipcwd_private.supports_temp) {
 604                 ret = misc_register(&pcipcwd_temp_miscdev);
 605                 if (ret != 0) {
 606                         printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 607                                 TEMP_MINOR, ret);
 608                         goto err_out_unregister_reboot;
 609                 }
 610         }
 611
 612         ret = misc_register(&pcipcwd_miscdev);
 613         if (ret != 0) {
 614                 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 615                         WATCHDOG_MINOR, ret);
 616                 goto err_out_misc_deregister;
 617         }
 618
 619         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 620                 heartbeat, nowayout);
 621
 622         return 0;
 623
 624 err_out_misc_deregister:
 625         if (pcipcwd_private.supports_temp)
 626                 misc_deregister(&pcipcwd_temp_miscdev);
 627 err_out_unregister_reboot:
 628         unregister_reboot_notifier(&pcipcwd_notifier);
 629 err_out_release_region:
 630         pci_release_regions(pdev);
 631 err_out_disable_device:
 632         pci_disable_device(pdev);
 633         return ret;
 634 }
 635
 636 static void __devexit pcipcwd_card_exit(struct pci_dev *pdev)
 637 {
 638         /* Stop the timer before we leave */
 639         if (!nowayout)
 640                 pcipcwd_stop();
 641
 642         /* Deregister */
 643         misc_deregister(&pcipcwd_miscdev);
 644         if (pcipcwd_private.supports_temp)
 645                 misc_deregister(&pcipcwd_temp_miscdev);
 646         unregister_reboot_notifier(&pcipcwd_notifier);
 647         pci_release_regions(pdev);
 648         pci_disable_device(pdev);
 649         cards_found--;
 650 }
 651
 652 static struct pci_device_id pcipcwd_pci_tbl[] = {
 653         { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
 654                 PCI_ANY_ID, PCI_ANY_ID, },
 655         { 0 },                  /* End of list */
 656 };
 657 MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
 658
 659 static struct pci_driver pcipcwd_driver = {
 660         .name           = WATCHDOG_NAME,
 661         .id_table       = pcipcwd_pci_tbl,
 662         .probe          = pcipcwd_card_init,
 663         .remove         = __devexit_p(pcipcwd_card_exit),
 664 };
 665
 666 static int __init pcipcwd_init_module(void)
 667 {
 668         spin_lock_init (&pcipcwd_private.io_lock);
 669
 670         return pci_module_init(&pcipcwd_driver);
 671 }
 672
 673 static void __exit pcipcwd_cleanup_module(void)
 674 {
 675         pci_unregister_driver(&pcipcwd_driver);
 676 }
 677
 678 module_init(pcipcwd_init_module);
 679 module_exit(pcipcwd_cleanup_module);
 680
 681 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
 682 MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
 683 MODULE_LICENSE("GPL");
 684 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 685 MODULE_ALIAS_MISCDEV(TEMP_MINOR);