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 *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         static struct watchdog_info ident = {
 297                 .options =              WDIOF_OVERHEAT |
 298                                         WDIOF_CARDRESET |
 299                                         WDIOF_KEEPALIVEPING |
 300                                         WDIOF_SETTIMEOUT |
 301                                         WDIOF_MAGICCLOSE,
 302                 .firmware_version =     1,
 303                 .identity =             WATCHDOG_DRIVER_NAME,
 304         };
 305
 306         switch (cmd) {
 307                 case WDIOC_GETSUPPORT:
 308                         return copy_to_user((struct watchdog_info *) arg, &ident,
 309                                 sizeof (ident)) ? -EFAULT : 0;
 310
 311                 case WDIOC_GETSTATUS:
 312                 {
 313                         int status;
 314
 315                         pcipcwd_get_status(&status);
 316
 317                         return put_user(status, (int *) arg);
 318                 }
 319
 320                 case WDIOC_GETBOOTSTATUS:
 321                         return put_user(pcipcwd_private.boot_status, (int *) arg);
 322
 323                 case WDIOC_GETTEMP:
 324                 {
 325                         int temperature;
 326
 327                         if (pcipcwd_get_temperature(&temperature))
 328                                 return -EFAULT;
 329
 330                         return put_user(temperature, (int *) arg);
 331                 }
 332
 333                 case WDIOC_KEEPALIVE:
 334                         pcipcwd_keepalive();
 335                         return 0;
 336
 337                 case WDIOC_SETOPTIONS:
 338                 {
 339                         int new_options, retval = -EINVAL;
 340
 341                         if (get_user (new_options, (int *) arg))
 342                                 return -EFAULT;
 343
 344                         if (new_options & WDIOS_DISABLECARD) {
 345                                 pcipcwd_stop();
 346                                 retval = 0;
 347                         }
 348
 349                         if (new_options & WDIOS_ENABLECARD) {
 350                                 pcipcwd_start();
 351                                 retval = 0;
 352                         }
 353
 354                         if (new_options & WDIOS_TEMPPANIC) {
 355                                 temp_panic = 1;
 356                                 retval = 0;
 357                         }
 358
 359                         return retval;
 360                 }
 361
 362                 case WDIOC_SETTIMEOUT:
 363                 {
 364                         int new_heartbeat;
 365
 366                         if (get_user(new_heartbeat, (int *) arg))
 367                                 return -EFAULT;
 368
 369                         if (pcipcwd_set_heartbeat(new_heartbeat))
 370                             return -EINVAL;
 371
 372                         pcipcwd_keepalive();
 373                         /* Fall */
 374                 }
 375
 376                 case WDIOC_GETTIMEOUT:
 377                         return put_user(heartbeat, (int *)arg);
 378
 379                 default:
 380                         return -ENOIOCTLCMD;
 381         }
 382 }
 383
 384 static int pcipcwd_open(struct inode *inode, struct file *file)
 385 {
 386         /* /dev/watchdog can only be opened once */
 387         if (test_and_set_bit(0, &is_active))
 388                 return -EBUSY;
 389
 390         /* Activate */
 391         pcipcwd_start();
 392         pcipcwd_keepalive();
 393         return 0;
 394 }
 395
 396 static int pcipcwd_release(struct inode *inode, struct file *file)
 397 {
 398         /*
 399          *      Shut off the timer.
 400          */
 401         if (expect_release == 42) {
 402                 pcipcwd_stop();
 403         } else {
 404                 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
 405                 pcipcwd_keepalive();
 406         }
 407         expect_release = 0;
 408         clear_bit(0, &is_active);
 409         return 0;
 410 }
 411
 412 /*
 413  *      /dev/temperature handling
 414  */
 415
 416 static ssize_t pcipcwd_temp_read(struct file *file, char *data,
 417                                 size_t len, loff_t *ppos)
 418 {
 419         int temperature;
 420
 421         /* Can't seek (pwrite) on this device  */
 422         if (ppos != &file->f_pos)
 423                 return -ESPIPE;
 424
 425         if (pcipcwd_get_temperature(&temperature))
 426                 return -EFAULT;
 427
 428         if (copy_to_user (data, &temperature, 1))
 429                 return -EFAULT;
 430
 431         return 1;
 432 }
 433
 434 static int pcipcwd_temp_open(struct inode *inode, struct file *file)
 435 {
 436         if (!pcipcwd_private.supports_temp)
 437                 return -ENODEV;
 438
 439         return 0;
 440 }
 441
 442 static int pcipcwd_temp_release(struct inode *inode, struct file *file)
 443 {
 444         return 0;
 445 }
 446
 447 /*
 448  *      Notify system
 449  */
 450
 451 static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
 452 {
 453         if (code==SYS_DOWN || code==SYS_HALT) {
 454                 /* Turn the WDT off */
 455                 pcipcwd_stop();
 456         }
 457
 458         return NOTIFY_DONE;
 459 }
 460
 461 /*
 462  *      Kernel Interfaces
 463  */
 464
 465 static struct file_operations pcipcwd_fops = {
 466         .owner =        THIS_MODULE,
 467         .llseek =       no_llseek,
 468         .write =        pcipcwd_write,
 469         .ioctl =        pcipcwd_ioctl,
 470         .open =         pcipcwd_open,
 471         .release =      pcipcwd_release,
 472 };
 473
 474 static struct miscdevice pcipcwd_miscdev = {
 475         .minor =        WATCHDOG_MINOR,
 476         .name =         "watchdog",
 477         .fops =         &pcipcwd_fops,
 478 };
 479
 480 static struct file_operations pcipcwd_temp_fops = {
 481         .owner =        THIS_MODULE,
 482         .llseek =       no_llseek,
 483         .read =         pcipcwd_temp_read,
 484         .open =         pcipcwd_temp_open,
 485         .release =      pcipcwd_temp_release,
 486 };
 487
 488 static struct miscdevice pcipcwd_temp_miscdev = {
 489         .minor =        TEMP_MINOR,
 490         .name =         "temperature",
 491         .fops =         &pcipcwd_temp_fops,
 492 };
 493
 494 static struct notifier_block pcipcwd_notifier = {
 495         .notifier_call =        pcipcwd_notify_sys,
 496 };
 497
 498 /*
 499  *      Init & exit routines
 500  */
 501
 502 static inline void check_temperature_support(void)
 503 {
 504         if (inb_p(pcipcwd_private.io_addr) != 0xF0)
 505                 pcipcwd_private.supports_temp = 1;
 506 }
 507
 508 static int __devinit pcipcwd_card_init(struct pci_dev *pdev,
 509                 const struct pci_device_id *ent)
 510 {
 511         int ret = -EIO;
 512         int got_fw_rev, fw_rev_major, fw_rev_minor;
 513         char fw_ver_str[20];
 514         char option_switches;
 515
 516         cards_found++;
 517         if (cards_found == 1)
 518                 printk(KERN_INFO PFX DRIVER_VERSION);
 519
 520         if (cards_found > 1) {
 521                 printk(KERN_ERR PFX "This driver only supports 1 device\n");
 522                 return -ENODEV;
 523         }
 524
 525         if (pci_enable_device(pdev)) {
 526                 printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
 527                 return -ENODEV;
 528         }
 529
 530         if (pci_resource_start(pdev, 0) == 0x0000) {
 531                 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
 532                 ret = -ENODEV;
 533                 goto err_out_disable_device;
 534         }
 535
 536         pcipcwd_private.pdev = pdev;
 537         pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
 538
 539         if (pci_request_regions(pdev, WATCHDOG_NAME)) {
 540                 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
 541                         (int) pcipcwd_private.io_addr);
 542                 ret = -EIO;
 543                 goto err_out_disable_device;
 544         }
 545
 546         /* get the boot_status */
 547         pcipcwd_get_status(&pcipcwd_private.boot_status);
 548
 549         /* clear the "card caused reboot" flag */
 550         pcipcwd_clear_status();
 551
 552         /* disable card */
 553         pcipcwd_stop();
 554
 555         /* Check whether or not the card supports the temperature device */
 556         check_temperature_support();
 557
 558         /* Get the Firmware Version */
 559         got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
 560         if (got_fw_rev) {
 561                 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
 562         } else {
 563                 sprintf(fw_ver_str, "<card no answer>");
 564         }
 565
 566         /* Get switch settings */
 567         option_switches = inb_p(pcipcwd_private.io_addr + 3);
 568
 569         printk(KERN_INFO PFX "Found card at port 0x%04x (Firmware: %s) %s temp option\n",
 570                 (int) pcipcwd_private.io_addr, fw_ver_str,
 571                 (pcipcwd_private.supports_temp ? "with" : "without"));
 572
 573         printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
 574                 option_switches,
 575                 ((option_switches & 0x10) ? "ON" : "OFF"),
 576                 ((option_switches & 0x08) ? "ON" : "OFF"));
 577
 578         if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
 579                 printk(KERN_INFO PFX "Previous reset was caused by the Watchdog card\n");
 580
 581         if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
 582                 printk(KERN_INFO PFX "Card sensed a CPU Overheat\n");
 583
 584         if (pcipcwd_private.boot_status == 0)
 585                 printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
 586
 587         /* Check that the heartbeat value is within it's range ; if not reset to the default */
 588         if (pcipcwd_set_heartbeat(heartbeat)) {
 589                 pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
 590                 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
 591                         WATCHDOG_HEARTBEAT);
 592         }
 593
 594         ret = register_reboot_notifier(&pcipcwd_notifier);
 595         if (ret != 0) {
 596                 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
 597                         ret);
 598                 goto err_out_release_region;
 599         }
 600
 601         if (pcipcwd_private.supports_temp) {
 602                 ret = misc_register(&pcipcwd_temp_miscdev);
 603                 if (ret != 0) {
 604                         printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 605                                 TEMP_MINOR, ret);
 606                         goto err_out_unregister_reboot;
 607                 }
 608         }
 609
 610         ret = misc_register(&pcipcwd_miscdev);
 611         if (ret != 0) {
 612                 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 613                         WATCHDOG_MINOR, ret);
 614                 goto err_out_misc_deregister;
 615         }
 616
 617         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 618                 heartbeat, nowayout);
 619
 620         return 0;
 621
 622 err_out_misc_deregister:
 623         if (pcipcwd_private.supports_temp)
 624                 misc_deregister(&pcipcwd_temp_miscdev);
 625 err_out_unregister_reboot:
 626         unregister_reboot_notifier(&pcipcwd_notifier);
 627 err_out_release_region:
 628         pci_release_regions(pdev);
 629 err_out_disable_device:
 630         pci_disable_device(pdev);
 631         return ret;
 632 }
 633
 634 static void __devexit pcipcwd_card_exit(struct pci_dev *pdev)
 635 {
 636         /* Stop the timer before we leave */
 637         if (!nowayout)
 638                 pcipcwd_stop();
 639
 640         /* Deregister */
 641         misc_deregister(&pcipcwd_miscdev);
 642         if (pcipcwd_private.supports_temp)
 643                 misc_deregister(&pcipcwd_temp_miscdev);
 644         unregister_reboot_notifier(&pcipcwd_notifier);
 645         pci_release_regions(pdev);
 646         pci_disable_device(pdev);
 647         cards_found--;
 648 }
 649
 650 static struct pci_device_id pcipcwd_pci_tbl[] = {
 651         { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
 652                 PCI_ANY_ID, PCI_ANY_ID, },
 653         { 0 },                  /* End of list */
 654 };
 655 MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
 656
 657 static struct pci_driver pcipcwd_driver = {
 658         .name           = WATCHDOG_NAME,
 659         .id_table       = pcipcwd_pci_tbl,
 660         .probe          = pcipcwd_card_init,
 661         .remove         = __devexit_p(pcipcwd_card_exit),
 662 };
 663
 664 static int __init pcipcwd_init_module(void)
 665 {
 666         spin_lock_init (&pcipcwd_private.io_lock);
 667
 668         return pci_module_init(&pcipcwd_driver);
 669 }
 670
 671 static void __exit pcipcwd_cleanup_module(void)
 672 {
 673         pci_unregister_driver(&pcipcwd_driver);
 674 }
 675
 676 module_init(pcipcwd_init_module);
 677 module_exit(pcipcwd_cleanup_module);
 678
 679 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
 680 MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
 681 MODULE_LICENSE("GPL");
 682 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 683 MODULE_ALIAS_MISCDEV(TEMP_MINOR);