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 "1.01"
  52 #define WATCHDOG_DATE "15 Mar 2005"
  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 static int nowayout = WATCHDOG_NOWAYOUT;
 107 module_param(nowayout, int, 0);
 108 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
 109
 110 /*
 111  *      Internal functions
 112  */
 113
 114 static int send_command(int cmd, int *msb, int *lsb)
 115 {
 116         int got_response, count;
 117
 118         spin_lock(&pcipcwd_private.io_lock);
 119         /* If a command requires data it should be written first.
 120          * Data for commands with 8 bits of data should be written to port 4.
 121          * Commands with 16 bits of data, should be written as LSB to port 4
 122          * and MSB to port 5.
 123          * After the required data has been written then write the command to
 124          * port 6. */
 125         outb_p(*lsb, pcipcwd_private.io_addr + 4);
 126         outb_p(*msb, pcipcwd_private.io_addr + 5);
 127         outb_p(cmd, pcipcwd_private.io_addr + 6);
 128
 129         /* wait till the pci card processed the command, signaled by
 130          * the WRSP bit in port 2 and give it a max. timeout of
 131          * PCI_COMMAND_TIMEOUT to process */
 132         got_response = inb_p(pcipcwd_private.io_addr + 2) & 0x40;
 133         for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response); count++) {
 134                 mdelay(1);
 135                 got_response = inb_p(pcipcwd_private.io_addr + 2) & 0x40;
 136         }
 137
 138         if (got_response) {
 139                 /* read back response */
 140                 *lsb = inb_p(pcipcwd_private.io_addr + 4);
 141                 *msb = inb_p(pcipcwd_private.io_addr + 5);
 142
 143                 /* clear WRSP bit */
 144                 inb_p(pcipcwd_private.io_addr + 6);
 145         }
 146         spin_unlock(&pcipcwd_private.io_lock);
 147
 148         return got_response;
 149 }
 150
 151 static int pcipcwd_start(void)
 152 {
 153         int stat_reg;
 154
 155         spin_lock(&pcipcwd_private.io_lock);
 156         outb_p(0x00, pcipcwd_private.io_addr + 3);
 157         udelay(1000);
 158
 159         stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 160         spin_unlock(&pcipcwd_private.io_lock);
 161
 162         if (stat_reg & 0x10) {
 163                 printk(KERN_ERR PFX "Card timer not enabled\n");
 164                 return -1;
 165         }
 166
 167         return 0;
 168 }
 169
 170 static int pcipcwd_stop(void)
 171 {
 172         int stat_reg;
 173
 174         spin_lock(&pcipcwd_private.io_lock);
 175         outb_p(0xA5, pcipcwd_private.io_addr + 3);
 176         udelay(1000);
 177
 178         outb_p(0xA5, pcipcwd_private.io_addr + 3);
 179         udelay(1000);
 180
 181         stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 182         spin_unlock(&pcipcwd_private.io_lock);
 183
 184         if (!(stat_reg & 0x10)) {
 185                 printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
 186                 return -1;
 187         }
 188
 189         return 0;
 190 }
 191
 192 static int pcipcwd_keepalive(void)
 193 {
 194         /* Re-trigger watchdog by writing to port 0 */
 195         outb_p(0x42, pcipcwd_private.io_addr);
 196         return 0;
 197 }
 198
 199 static int pcipcwd_set_heartbeat(int t)
 200 {
 201         int t_msb = t / 256;
 202         int t_lsb = t % 256;
 203
 204         if ((t < 0x0001) || (t > 0xFFFF))
 205                 return -EINVAL;
 206
 207         /* Write new heartbeat to watchdog */
 208         send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
 209
 210         heartbeat = t;
 211         return 0;
 212 }
 213
 214 static int pcipcwd_get_status(int *status)
 215 {
 216         int new_status;
 217
 218         *status=0;
 219         new_status = inb_p(pcipcwd_private.io_addr + 1);
 220         if (new_status & WD_PCI_WTRP)
 221                 *status |= WDIOF_CARDRESET;
 222         if (new_status & WD_PCI_TTRP) {
 223                 *status |= WDIOF_OVERHEAT;
 224                 if (temp_panic)
 225                         panic(PFX "Temperature overheat trip!\n");
 226         }
 227
 228         return 0;
 229 }
 230
 231 static int pcipcwd_clear_status(void)
 232 {
 233         outb_p(0x01, pcipcwd_private.io_addr + 1);
 234         return 0;
 235 }
 236
 237 static int pcipcwd_get_temperature(int *temperature)
 238 {
 239         *temperature = 0;
 240         if (!pcipcwd_private.supports_temp)
 241                 return -ENODEV;
 242
 243         /*
 244          * Convert celsius to fahrenheit, since this was
 245          * the decided 'standard' for this return value.
 246          */
 247         *temperature = ((inb_p(pcipcwd_private.io_addr)) * 9 / 5) + 32;
 248
 249         return 0;
 250 }
 251
 252 /*
 253  *      /dev/watchdog handling
 254  */
 255
 256 static ssize_t pcipcwd_write(struct file *file, const char __user *data,
 257                               size_t len, loff_t *ppos)
 258 {
 259         /* See if we got the magic character 'V' and reload the timer */
 260         if (len) {
 261                 if (!nowayout) {
 262                         size_t i;
 263
 264                         /* note: just in case someone wrote the magic character
 265                          * five months ago... */
 266                         expect_release = 0;
 267
 268                         /* scan to see whether or not we got the magic character */
 269                         for (i = 0; i != len; i++) {
 270                                 char c;
 271                                 if(get_user(c, data+i))
 272                                         return -EFAULT;
 273                                 if (c == 'V')
 274                                         expect_release = 42;
 275                         }
 276                 }
 277
 278                 /* someone wrote to us, we should reload the timer */
 279                 pcipcwd_keepalive();
 280         }
 281         return len;
 282 }
 283
 284 static int pcipcwd_ioctl(struct inode *inode, struct file *file,
 285                           unsigned int cmd, unsigned long arg)
 286 {
 287         void __user *argp = (void __user *)arg;
 288         int __user *p = argp;
 289         static struct watchdog_info ident = {
 290                 .options =              WDIOF_OVERHEAT |
 291                                         WDIOF_CARDRESET |
 292                                         WDIOF_KEEPALIVEPING |
 293                                         WDIOF_SETTIMEOUT |
 294                                         WDIOF_MAGICCLOSE,
 295                 .firmware_version =     1,
 296                 .identity =             WATCHDOG_DRIVER_NAME,
 297         };
 298
 299         switch (cmd) {
 300                 case WDIOC_GETSUPPORT:
 301                         return copy_to_user(argp, &ident,
 302                                 sizeof (ident)) ? -EFAULT : 0;
 303
 304                 case WDIOC_GETSTATUS:
 305                 {
 306                         int status;
 307
 308                         pcipcwd_get_status(&status);
 309
 310                         return put_user(status, p);
 311                 }
 312
 313                 case WDIOC_GETBOOTSTATUS:
 314                         return put_user(pcipcwd_private.boot_status, p);
 315
 316                 case WDIOC_GETTEMP:
 317                 {
 318                         int temperature;
 319
 320                         if (pcipcwd_get_temperature(&temperature))
 321                                 return -EFAULT;
 322
 323                         return put_user(temperature, p);
 324                 }
 325
 326                 case WDIOC_KEEPALIVE:
 327                         pcipcwd_keepalive();
 328                         return 0;
 329
 330                 case WDIOC_SETOPTIONS:
 331                 {
 332                         int new_options, retval = -EINVAL;
 333
 334                         if (get_user (new_options, p))
 335                                 return -EFAULT;
 336
 337                         if (new_options & WDIOS_DISABLECARD) {
 338                                 pcipcwd_stop();
 339                                 retval = 0;
 340                         }
 341
 342                         if (new_options & WDIOS_ENABLECARD) {
 343                                 pcipcwd_start();
 344                                 retval = 0;
 345                         }
 346
 347                         if (new_options & WDIOS_TEMPPANIC) {
 348                                 temp_panic = 1;
 349                                 retval = 0;
 350                         }
 351
 352                         return retval;
 353                 }
 354
 355                 case WDIOC_SETTIMEOUT:
 356                 {
 357                         int new_heartbeat;
 358
 359                         if (get_user(new_heartbeat, p))
 360                                 return -EFAULT;
 361
 362                         if (pcipcwd_set_heartbeat(new_heartbeat))
 363                             return -EINVAL;
 364
 365                         pcipcwd_keepalive();
 366                         /* Fall */
 367                 }
 368
 369                 case WDIOC_GETTIMEOUT:
 370                         return put_user(heartbeat, p);
 371
 372                 default:
 373                         return -ENOIOCTLCMD;
 374         }
 375 }
 376
 377 static int pcipcwd_open(struct inode *inode, struct file *file)
 378 {
 379         /* /dev/watchdog can only be opened once */
 380         if (test_and_set_bit(0, &is_active))
 381                 return -EBUSY;
 382
 383         /* Activate */
 384         pcipcwd_start();
 385         pcipcwd_keepalive();
 386         return nonseekable_open(inode, file);
 387 }
 388
 389 static int pcipcwd_release(struct inode *inode, struct file *file)
 390 {
 391         /*
 392          *      Shut off the timer.
 393          */
 394         if (expect_release == 42) {
 395                 pcipcwd_stop();
 396         } else {
 397                 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
 398                 pcipcwd_keepalive();
 399         }
 400         expect_release = 0;
 401         clear_bit(0, &is_active);
 402         return 0;
 403 }
 404
 405 /*
 406  *      /dev/temperature handling
 407  */
 408
 409 static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
 410                                 size_t len, loff_t *ppos)
 411 {
 412         int temperature;
 413
 414         if (pcipcwd_get_temperature(&temperature))
 415                 return -EFAULT;
 416
 417         if (copy_to_user (data, &temperature, 1))
 418                 return -EFAULT;
 419
 420         return 1;
 421 }
 422
 423 static int pcipcwd_temp_open(struct inode *inode, struct file *file)
 424 {
 425         if (!pcipcwd_private.supports_temp)
 426                 return -ENODEV;
 427
 428         return nonseekable_open(inode, file);
 429 }
 430
 431 static int pcipcwd_temp_release(struct inode *inode, struct file *file)
 432 {
 433         return 0;
 434 }
 435
 436 /*
 437  *      Notify system
 438  */
 439
 440 static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
 441 {
 442         if (code==SYS_DOWN || code==SYS_HALT) {
 443                 /* Turn the WDT off */
 444                 pcipcwd_stop();
 445         }
 446
 447         return NOTIFY_DONE;
 448 }
 449
 450 /*
 451  *      Kernel Interfaces
 452  */
 453
 454 static struct file_operations pcipcwd_fops = {
 455         .owner =        THIS_MODULE,
 456         .llseek =       no_llseek,
 457         .write =        pcipcwd_write,
 458         .ioctl =        pcipcwd_ioctl,
 459         .open =         pcipcwd_open,
 460         .release =      pcipcwd_release,
 461 };
 462
 463 static struct miscdevice pcipcwd_miscdev = {
 464         .minor =        WATCHDOG_MINOR,
 465         .name =         "watchdog",
 466         .fops =         &pcipcwd_fops,
 467 };
 468
 469 static struct file_operations pcipcwd_temp_fops = {
 470         .owner =        THIS_MODULE,
 471         .llseek =       no_llseek,
 472         .read =         pcipcwd_temp_read,
 473         .open =         pcipcwd_temp_open,
 474         .release =      pcipcwd_temp_release,
 475 };
 476
 477 static struct miscdevice pcipcwd_temp_miscdev = {
 478         .minor =        TEMP_MINOR,
 479         .name =         "temperature",
 480         .fops =         &pcipcwd_temp_fops,
 481 };
 482
 483 static struct notifier_block pcipcwd_notifier = {
 484         .notifier_call =        pcipcwd_notify_sys,
 485 };
 486
 487 /*
 488  *      Init & exit routines
 489  */
 490
 491 static inline void check_temperature_support(void)
 492 {
 493         if (inb_p(pcipcwd_private.io_addr) != 0xF0)
 494                 pcipcwd_private.supports_temp = 1;
 495 }
 496
 497 static int __devinit pcipcwd_card_init(struct pci_dev *pdev,
 498                 const struct pci_device_id *ent)
 499 {
 500         int ret = -EIO;
 501         int got_fw_rev, fw_rev_major, fw_rev_minor;
 502         char fw_ver_str[20];
 503         char option_switches;
 504
 505         cards_found++;
 506         if (cards_found == 1)
 507                 printk(KERN_INFO PFX DRIVER_VERSION);
 508
 509         if (cards_found > 1) {
 510                 printk(KERN_ERR PFX "This driver only supports 1 device\n");
 511                 return -ENODEV;
 512         }
 513
 514         if (pci_enable_device(pdev)) {
 515                 printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
 516                 return -ENODEV;
 517         }
 518
 519         if (pci_resource_start(pdev, 0) == 0x0000) {
 520                 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
 521                 ret = -ENODEV;
 522                 goto err_out_disable_device;
 523         }
 524
 525         pcipcwd_private.pdev = pdev;
 526         pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
 527
 528         if (pci_request_regions(pdev, WATCHDOG_NAME)) {
 529                 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
 530                         (int) pcipcwd_private.io_addr);
 531                 ret = -EIO;
 532                 goto err_out_disable_device;
 533         }
 534
 535         /* get the boot_status */
 536         pcipcwd_get_status(&pcipcwd_private.boot_status);
 537
 538         /* clear the "card caused reboot" flag */
 539         pcipcwd_clear_status();
 540
 541         /* disable card */
 542         pcipcwd_stop();
 543
 544         /* Check whether or not the card supports the temperature device */
 545         check_temperature_support();
 546
 547         /* Get the Firmware Version */
 548         got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
 549         if (got_fw_rev) {
 550                 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
 551         } else {
 552                 sprintf(fw_ver_str, "<card no answer>");
 553         }
 554
 555         /* Get switch settings */
 556         option_switches = inb_p(pcipcwd_private.io_addr + 3);
 557
 558         printk(KERN_INFO PFX "Found card at port 0x%04x (Firmware: %s) %s temp option\n",
 559                 (int) pcipcwd_private.io_addr, fw_ver_str,
 560                 (pcipcwd_private.supports_temp ? "with" : "without"));
 561
 562         printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
 563                 option_switches,
 564                 ((option_switches & 0x10) ? "ON" : "OFF"),
 565                 ((option_switches & 0x08) ? "ON" : "OFF"));
 566
 567         if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
 568                 printk(KERN_INFO PFX "Previous reset was caused by the Watchdog card\n");
 569
 570         if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
 571                 printk(KERN_INFO PFX "Card sensed a CPU Overheat\n");
 572
 573         if (pcipcwd_private.boot_status == 0)
 574                 printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
 575
 576         /* Check that the heartbeat value is within it's range ; if not reset to the default */
 577         if (pcipcwd_set_heartbeat(heartbeat)) {
 578                 pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
 579                 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
 580                         WATCHDOG_HEARTBEAT);
 581         }
 582
 583         ret = register_reboot_notifier(&pcipcwd_notifier);
 584         if (ret != 0) {
 585                 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
 586                         ret);
 587                 goto err_out_release_region;
 588         }
 589
 590         if (pcipcwd_private.supports_temp) {
 591                 ret = misc_register(&pcipcwd_temp_miscdev);
 592                 if (ret != 0) {
 593                         printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 594                                 TEMP_MINOR, ret);
 595                         goto err_out_unregister_reboot;
 596                 }
 597         }
 598
 599         ret = misc_register(&pcipcwd_miscdev);
 600         if (ret != 0) {
 601                 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 602                         WATCHDOG_MINOR, ret);
 603                 goto err_out_misc_deregister;
 604         }
 605
 606         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 607                 heartbeat, nowayout);
 608
 609         return 0;
 610
 611 err_out_misc_deregister:
 612         if (pcipcwd_private.supports_temp)
 613                 misc_deregister(&pcipcwd_temp_miscdev);
 614 err_out_unregister_reboot:
 615         unregister_reboot_notifier(&pcipcwd_notifier);
 616 err_out_release_region:
 617         pci_release_regions(pdev);
 618 err_out_disable_device:
 619         pci_disable_device(pdev);
 620         return ret;
 621 }
 622
 623 static void __devexit pcipcwd_card_exit(struct pci_dev *pdev)
 624 {
 625         /* Stop the timer before we leave */
 626         if (!nowayout)
 627                 pcipcwd_stop();
 628
 629         /* Deregister */
 630         misc_deregister(&pcipcwd_miscdev);
 631         if (pcipcwd_private.supports_temp)
 632                 misc_deregister(&pcipcwd_temp_miscdev);
 633         unregister_reboot_notifier(&pcipcwd_notifier);
 634         pci_release_regions(pdev);
 635         pci_disable_device(pdev);
 636         cards_found--;
 637 }
 638
 639 static struct pci_device_id pcipcwd_pci_tbl[] = {
 640         { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
 641                 PCI_ANY_ID, PCI_ANY_ID, },
 642         { 0 },                  /* End of list */
 643 };
 644 MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
 645
 646 static struct pci_driver pcipcwd_driver = {
 647         .name           = WATCHDOG_NAME,
 648         .id_table       = pcipcwd_pci_tbl,
 649         .probe          = pcipcwd_card_init,
 650         .remove         = __devexit_p(pcipcwd_card_exit),
 651 };
 652
 653 static int __init pcipcwd_init_module(void)
 654 {
 655         spin_lock_init (&pcipcwd_private.io_lock);
 656
 657         return pci_register_driver(&pcipcwd_driver);
 658 }
 659
 660 static void __exit pcipcwd_cleanup_module(void)
 661 {
 662         pci_unregister_driver(&pcipcwd_driver);
 663 }
 664
 665 module_init(pcipcwd_init_module);
 666 module_exit(pcipcwd_cleanup_module);
 667
 668 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
 669 MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
 670 MODULE_LICENSE("GPL");
 671 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 672 MODULE_ALIAS_MISCDEV(TEMP_MINOR);