drivers/watchdog/wdt_pci.c

   1 /*
   2  *      Industrial Computer Source PCI-WDT500/501 driver
   3  *
   4  *      (c) Copyright 1996-1997 Alan Cox <alan@lxorguk.ukuu.org.uk>,
   5  *                                              All Rights Reserved.
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  *
  12  *      Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
  13  *      warranty for any of this software. This material is provided
  14  *      "AS-IS" and at no charge.
  15  *
  16  *      (c) Copyright 1995    Alan Cox <alan@lxorguk.ukuu.org.uk>
  17  *
  18  *      Release 0.10.
  19  *
  20  *      Fixes
  21  *              Dave Gregorich  :       Modularisation and minor bugs
  22  *              Alan Cox        :       Added the watchdog ioctl() stuff
  23  *              Alan Cox        :       Fixed the reboot problem (as noted by
  24  *                                      Matt Crocker).
  25  *              Alan Cox        :       Added wdt= boot option
  26  *              Alan Cox        :       Cleaned up copy/user stuff
  27  *              Tim Hockin      :       Added insmod parameters, comment cleanup
  28  *                                      Parameterized timeout
  29  *              JP Nollmann     :       Added support for PCI wdt501p
  30  *              Alan Cox        :       Split ISA and PCI cards into two drivers
  31  *              Jeff Garzik     :       PCI cleanups
  32  *              Tigran Aivazian :       Restructured wdtpci_init_one() to handle
  33  *                                      failures
  34  *              Joel Becker     :       Added WDIOC_GET/SETTIMEOUT
  35  *              Zwane Mwaikambo :       Magic char closing, locking changes,
  36  *                                      cleanups
  37  *              Matt Domsch     :       nowayout module option
  38  */
  39
  40 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  41
  42 #include <linux/interrupt.h>
  43 #include <linux/module.h>
  44 #include <linux/moduleparam.h>
  45 #include <linux/types.h>
  46 #include <linux/miscdevice.h>
  47 #include <linux/watchdog.h>
  48 #include <linux/ioport.h>
  49 #include <linux/delay.h>
  50 #include <linux/notifier.h>
  51 #include <linux/reboot.h>
  52 #include <linux/init.h>
  53 #include <linux/fs.h>
  54 #include <linux/pci.h>
  55 #include <linux/io.h>
  56 #include <linux/uaccess.h>
  57
  58 #include <asm/system.h>
  59
  60 #define WDT_IS_PCI
  61 #include "wd501p.h"
  62
  63 /* We can only use 1 card due to the /dev/watchdog restriction */
  64 static int dev_count;
  65
  66 static unsigned long open_lock;
  67 static DEFINE_SPINLOCK(wdtpci_lock);
  68 static char expect_close;
  69
  70 static resource_size_t io;
  71 static int irq;
  72
  73 /* Default timeout */
  74 #define WD_TIMO 60                      /* Default heartbeat = 60 seconds */
  75
  76 static int heartbeat = WD_TIMO;
  77 static int wd_heartbeat;
  78 module_param(heartbeat, int, 0);
  79 MODULE_PARM_DESC(heartbeat,
  80                 "Watchdog heartbeat in seconds. (0<heartbeat<65536, default="
  81                                 __MODULE_STRING(WD_TIMO) ")");
  82
  83 static bool nowayout = WATCHDOG_NOWAYOUT;
  84 module_param(nowayout, bool, 0);
  85 MODULE_PARM_DESC(nowayout,
  86                 "Watchdog cannot be stopped once started (default="
  87                                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
  88
  89 /* Support for the Fan Tachometer on the PCI-WDT501 */
  90 static int tachometer;
  91 module_param(tachometer, int, 0);
  92 MODULE_PARM_DESC(tachometer,
  93                 "PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
  94
  95 static int type = 500;
  96 module_param(type, int, 0);
  97 MODULE_PARM_DESC(type,
  98                 "PCI-WDT501 Card type (500 or 501 , default=500)");
  99
 100 /*
 101  *      Programming support
 102  */
 103
 104 static void wdtpci_ctr_mode(int ctr, int mode)
 105 {
 106         ctr <<= 6;
 107         ctr |= 0x30;
 108         ctr |= (mode << 1);
 109         outb(ctr, WDT_CR);
 110         udelay(8);
 111 }
 112
 113 static void wdtpci_ctr_load(int ctr, int val)
 114 {
 115         outb(val & 0xFF, WDT_COUNT0 + ctr);
 116         udelay(8);
 117         outb(val >> 8, WDT_COUNT0 + ctr);
 118         udelay(8);
 119 }
 120
 121 /**
 122  *      wdtpci_start:
 123  *
 124  *      Start the watchdog driver.
 125  */
 126
 127 static int wdtpci_start(void)
 128 {
 129         unsigned long flags;
 130
 131         spin_lock_irqsave(&wdtpci_lock, flags);
 132
 133         /*
 134          * "pet" the watchdog, as Access says.
 135          * This resets the clock outputs.
 136          */
 137         inb(WDT_DC);                    /* Disable watchdog */
 138         udelay(8);
 139         wdtpci_ctr_mode(2, 0);          /* Program CTR2 for Mode 0:
 140                                                 Pulse on Terminal Count */
 141         outb(0, WDT_DC);                /* Enable watchdog */
 142         udelay(8);
 143         inb(WDT_DC);                    /* Disable watchdog */
 144         udelay(8);
 145         outb(0, WDT_CLOCK);             /* 2.0833MHz clock */
 146         udelay(8);
 147         inb(WDT_BUZZER);                /* disable */
 148         udelay(8);
 149         inb(WDT_OPTONOTRST);            /* disable */
 150         udelay(8);
 151         inb(WDT_OPTORST);               /* disable */
 152         udelay(8);
 153         inb(WDT_PROGOUT);               /* disable */
 154         udelay(8);
 155         wdtpci_ctr_mode(0, 3);          /* Program CTR0 for Mode 3:
 156                                                 Square Wave Generator */
 157         wdtpci_ctr_mode(1, 2);          /* Program CTR1 for Mode 2:
 158                                                 Rate Generator */
 159         wdtpci_ctr_mode(2, 1);          /* Program CTR2 for Mode 1:
 160                                                 Retriggerable One-Shot */
 161         wdtpci_ctr_load(0, 20833);      /* count at 100Hz */
 162         wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
 163         /* DO NOT LOAD CTR2 on PCI card! -- JPN */
 164         outb(0, WDT_DC);                /* Enable watchdog */
 165         udelay(8);
 166
 167         spin_unlock_irqrestore(&wdtpci_lock, flags);
 168         return 0;
 169 }
 170
 171 /**
 172  *      wdtpci_stop:
 173  *
 174  *      Stop the watchdog driver.
 175  */
 176
 177 static int wdtpci_stop(void)
 178 {
 179         unsigned long flags;
 180
 181         /* Turn the card off */
 182         spin_lock_irqsave(&wdtpci_lock, flags);
 183         inb(WDT_DC);                    /* Disable watchdog */
 184         udelay(8);
 185         wdtpci_ctr_load(2, 0);          /* 0 length reset pulses now */
 186         spin_unlock_irqrestore(&wdtpci_lock, flags);
 187         return 0;
 188 }
 189
 190 /**
 191  *      wdtpci_ping:
 192  *
 193  *      Reload counter one with the watchdog heartbeat. We don't bother
 194  *      reloading the cascade counter.
 195  */
 196
 197 static int wdtpci_ping(void)
 198 {
 199         unsigned long flags;
 200
 201         spin_lock_irqsave(&wdtpci_lock, flags);
 202         /* Write a watchdog value */
 203         inb(WDT_DC);                    /* Disable watchdog */
 204         udelay(8);
 205         wdtpci_ctr_mode(1, 2);          /* Re-Program CTR1 for Mode 2:
 206                                                         Rate Generator */
 207         wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
 208         outb(0, WDT_DC);                /* Enable watchdog */
 209         udelay(8);
 210         spin_unlock_irqrestore(&wdtpci_lock, flags);
 211         return 0;
 212 }
 213
 214 /**
 215  *      wdtpci_set_heartbeat:
 216  *      @t:             the new heartbeat value that needs to be set.
 217  *
 218  *      Set a new heartbeat value for the watchdog device. If the heartbeat
 219  *      value is incorrect we keep the old value and return -EINVAL.
 220  *      If successful we return 0.
 221  */
 222 static int wdtpci_set_heartbeat(int t)
 223 {
 224         /* Arbitrary, can't find the card's limits */
 225         if (t < 1 || t > 65535)
 226                 return -EINVAL;
 227
 228         heartbeat = t;
 229         wd_heartbeat = t * 100;
 230         return 0;
 231 }
 232
 233 /**
 234  *      wdtpci_get_status:
 235  *      @status:                the new status.
 236  *
 237  *      Extract the status information from a WDT watchdog device. There are
 238  *      several board variants so we have to know which bits are valid. Some
 239  *      bits default to one and some to zero in order to be maximally painful.
 240  *
 241  *      we then map the bits onto the status ioctl flags.
 242  */
 243
 244 static int wdtpci_get_status(int *status)
 245 {
 246         unsigned char new_status;
 247         unsigned long flags;
 248
 249         spin_lock_irqsave(&wdtpci_lock, flags);
 250         new_status = inb(WDT_SR);
 251         spin_unlock_irqrestore(&wdtpci_lock, flags);
 252
 253         *status = 0;
 254         if (new_status & WDC_SR_ISOI0)
 255                 *status |= WDIOF_EXTERN1;
 256         if (new_status & WDC_SR_ISII1)
 257                 *status |= WDIOF_EXTERN2;
 258         if (type == 501) {
 259                 if (!(new_status & WDC_SR_TGOOD))
 260                         *status |= WDIOF_OVERHEAT;
 261                 if (!(new_status & WDC_SR_PSUOVER))
 262                         *status |= WDIOF_POWEROVER;
 263                 if (!(new_status & WDC_SR_PSUUNDR))
 264                         *status |= WDIOF_POWERUNDER;
 265                 if (tachometer) {
 266                         if (!(new_status & WDC_SR_FANGOOD))
 267                                 *status |= WDIOF_FANFAULT;
 268                 }
 269         }
 270         return 0;
 271 }
 272
 273 /**
 274  *      wdtpci_get_temperature:
 275  *
 276  *      Reports the temperature in degrees Fahrenheit. The API is in
 277  *      farenheit. It was designed by an imperial measurement luddite.
 278  */
 279
 280 static int wdtpci_get_temperature(int *temperature)
 281 {
 282         unsigned short c;
 283         unsigned long flags;
 284         spin_lock_irqsave(&wdtpci_lock, flags);
 285         c = inb(WDT_RT);
 286         udelay(8);
 287         spin_unlock_irqrestore(&wdtpci_lock, flags);
 288         *temperature = (c * 11 / 15) + 7;
 289         return 0;
 290 }
 291
 292 /**
 293  *      wdtpci_interrupt:
 294  *      @irq:           Interrupt number
 295  *      @dev_id:        Unused as we don't allow multiple devices.
 296  *
 297  *      Handle an interrupt from the board. These are raised when the status
 298  *      map changes in what the board considers an interesting way. That means
 299  *      a failure condition occurring.
 300  */
 301
 302 static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
 303 {
 304         /*
 305          *      Read the status register see what is up and
 306          *      then printk it.
 307          */
 308         unsigned char status;
 309
 310         spin_lock(&wdtpci_lock);
 311
 312         status = inb(WDT_SR);
 313         udelay(8);
 314
 315         pr_crit("status %d\n", status);
 316
 317         if (type == 501) {
 318                 if (!(status & WDC_SR_TGOOD)) {
 319                         pr_crit("Overheat alarm (%d)\n", inb(WDT_RT));
 320                         udelay(8);
 321                 }
 322                 if (!(status & WDC_SR_PSUOVER))
 323                         pr_crit("PSU over voltage\n");
 324                 if (!(status & WDC_SR_PSUUNDR))
 325                         pr_crit("PSU under voltage\n");
 326                 if (tachometer) {
 327                         if (!(status & WDC_SR_FANGOOD))
 328                                 pr_crit("Possible fan fault\n");
 329                 }
 330         }
 331         if (!(status & WDC_SR_WCCR)) {
 332 #ifdef SOFTWARE_REBOOT
 333 #ifdef ONLY_TESTING
 334                 pr_crit("Would Reboot\n");
 335 #else
 336                 pr_crit("Initiating system reboot\n");
 337                 emergency_restart(NULL);
 338 #endif
 339 #else
 340                 pr_crit("Reset in 5ms\n");
 341 #endif
 342         }
 343         spin_unlock(&wdtpci_lock);
 344         return IRQ_HANDLED;
 345 }
 346
 347
 348 /**
 349  *      wdtpci_write:
 350  *      @file: file handle to the watchdog
 351  *      @buf: buffer to write (unused as data does not matter here
 352  *      @count: count of bytes
 353  *      @ppos: pointer to the position to write. No seeks allowed
 354  *
 355  *      A write to a watchdog device is defined as a keepalive signal. Any
 356  *      write of data will do, as we we don't define content meaning.
 357  */
 358
 359 static ssize_t wdtpci_write(struct file *file, const char __user *buf,
 360                                                 size_t count, loff_t *ppos)
 361 {
 362         if (count) {
 363                 if (!nowayout) {
 364                         size_t i;
 365
 366                         /* In case it was set long ago */
 367                         expect_close = 0;
 368
 369                         for (i = 0; i != count; i++) {
 370                                 char c;
 371                                 if (get_user(c, buf + i))
 372                                         return -EFAULT;
 373                                 if (c == 'V')
 374                                         expect_close = 42;
 375                         }
 376                 }
 377                 wdtpci_ping();
 378         }
 379         return count;
 380 }
 381
 382 /**
 383  *      wdtpci_ioctl:
 384  *      @file: file handle to the device
 385  *      @cmd: watchdog command
 386  *      @arg: argument pointer
 387  *
 388  *      The watchdog API defines a common set of functions for all watchdogs
 389  *      according to their available features. We only actually usefully support
 390  *      querying capabilities and current status.
 391  */
 392
 393 static long wdtpci_ioctl(struct file *file, unsigned int cmd,
 394                                                         unsigned long arg)
 395 {
 396         void __user *argp = (void __user *)arg;
 397         int __user *p = argp;
 398         int new_heartbeat;
 399         int status;
 400
 401         struct watchdog_info ident = {
 402                 .options =              WDIOF_SETTIMEOUT|
 403                                         WDIOF_MAGICCLOSE|
 404                                         WDIOF_KEEPALIVEPING,
 405                 .firmware_version =     1,
 406                 .identity =             "PCI-WDT500/501",
 407         };
 408
 409         /* Add options according to the card we have */
 410         ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
 411         if (type == 501) {
 412                 ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|
 413                                                         WDIOF_POWEROVER);
 414                 if (tachometer)
 415                         ident.options |= WDIOF_FANFAULT;
 416         }
 417
 418         switch (cmd) {
 419         case WDIOC_GETSUPPORT:
 420                 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
 421         case WDIOC_GETSTATUS:
 422                 wdtpci_get_status(&status);
 423                 return put_user(status, p);
 424         case WDIOC_GETBOOTSTATUS:
 425                 return put_user(0, p);
 426         case WDIOC_KEEPALIVE:
 427                 wdtpci_ping();
 428                 return 0;
 429         case WDIOC_SETTIMEOUT:
 430                 if (get_user(new_heartbeat, p))
 431                         return -EFAULT;
 432                 if (wdtpci_set_heartbeat(new_heartbeat))
 433                         return -EINVAL;
 434                 wdtpci_ping();
 435                 /* Fall */
 436         case WDIOC_GETTIMEOUT:
 437                 return put_user(heartbeat, p);
 438         default:
 439                 return -ENOTTY;
 440         }
 441 }
 442
 443 /**
 444  *      wdtpci_open:
 445  *      @inode: inode of device
 446  *      @file: file handle to device
 447  *
 448  *      The watchdog device has been opened. The watchdog device is single
 449  *      open and on opening we load the counters. Counter zero is a 100Hz
 450  *      cascade, into counter 1 which downcounts to reboot. When the counter
 451  *      triggers counter 2 downcounts the length of the reset pulse which
 452  *      set set to be as long as possible.
 453  */
 454
 455 static int wdtpci_open(struct inode *inode, struct file *file)
 456 {
 457         if (test_and_set_bit(0, &open_lock))
 458                 return -EBUSY;
 459
 460         if (nowayout)
 461                 __module_get(THIS_MODULE);
 462         /*
 463          *      Activate
 464          */
 465         wdtpci_start();
 466         return nonseekable_open(inode, file);
 467 }
 468
 469 /**
 470  *      wdtpci_release:
 471  *      @inode: inode to board
 472  *      @file: file handle to board
 473  *
 474  *      The watchdog has a configurable API. There is a religious dispute
 475  *      between people who want their watchdog to be able to shut down and
 476  *      those who want to be sure if the watchdog manager dies the machine
 477  *      reboots. In the former case we disable the counters, in the latter
 478  *      case you have to open it again very soon.
 479  */
 480
 481 static int wdtpci_release(struct inode *inode, struct file *file)
 482 {
 483         if (expect_close == 42) {
 484                 wdtpci_stop();
 485         } else {
 486                 pr_crit("Unexpected close, not stopping timer!\n");
 487                 wdtpci_ping();
 488         }
 489         expect_close = 0;
 490         clear_bit(0, &open_lock);
 491         return 0;
 492 }
 493
 494 /**
 495  *      wdtpci_temp_read:
 496  *      @file: file handle to the watchdog board
 497  *      @buf: buffer to write 1 byte into
 498  *      @count: length of buffer
 499  *      @ptr: offset (no seek allowed)
 500  *
 501  *      Read reports the temperature in degrees Fahrenheit. The API is in
 502  *      fahrenheit. It was designed by an imperial measurement luddite.
 503  */
 504
 505 static ssize_t wdtpci_temp_read(struct file *file, char __user *buf,
 506                                                 size_t count, loff_t *ptr)
 507 {
 508         int temperature;
 509
 510         if (wdtpci_get_temperature(&temperature))
 511                 return -EFAULT;
 512
 513         if (copy_to_user(buf, &temperature, 1))
 514                 return -EFAULT;
 515
 516         return 1;
 517 }
 518
 519 /**
 520  *      wdtpci_temp_open:
 521  *      @inode: inode of device
 522  *      @file: file handle to device
 523  *
 524  *      The temperature device has been opened.
 525  */
 526
 527 static int wdtpci_temp_open(struct inode *inode, struct file *file)
 528 {
 529         return nonseekable_open(inode, file);
 530 }
 531
 532 /**
 533  *      wdtpci_temp_release:
 534  *      @inode: inode to board
 535  *      @file: file handle to board
 536  *
 537  *      The temperature device has been closed.
 538  */
 539
 540 static int wdtpci_temp_release(struct inode *inode, struct file *file)
 541 {
 542         return 0;
 543 }
 544
 545 /**
 546  *      notify_sys:
 547  *      @this: our notifier block
 548  *      @code: the event being reported
 549  *      @unused: unused
 550  *
 551  *      Our notifier is called on system shutdowns. We want to turn the card
 552  *      off at reboot otherwise the machine will reboot again during memory
 553  *      test or worse yet during the following fsck. This would suck, in fact
 554  *      trust me - if it happens it does suck.
 555  */
 556
 557 static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code,
 558                                                         void *unused)
 559 {
 560         if (code == SYS_DOWN || code == SYS_HALT)
 561                 wdtpci_stop();
 562         return NOTIFY_DONE;
 563 }
 564
 565 /*
 566  *      Kernel Interfaces
 567  */
 568
 569
 570 static const struct file_operations wdtpci_fops = {
 571         .owner          = THIS_MODULE,
 572         .llseek         = no_llseek,
 573         .write          = wdtpci_write,
 574         .unlocked_ioctl = wdtpci_ioctl,
 575         .open           = wdtpci_open,
 576         .release        = wdtpci_release,
 577 };
 578
 579 static struct miscdevice wdtpci_miscdev = {
 580         .minor  = WATCHDOG_MINOR,
 581         .name   = "watchdog",
 582         .fops   = &wdtpci_fops,
 583 };
 584
 585 static const struct file_operations wdtpci_temp_fops = {
 586         .owner          = THIS_MODULE,
 587         .llseek         = no_llseek,
 588         .read           = wdtpci_temp_read,
 589         .open           = wdtpci_temp_open,
 590         .release        = wdtpci_temp_release,
 591 };
 592
 593 static struct miscdevice temp_miscdev = {
 594         .minor  = TEMP_MINOR,
 595         .name   = "temperature",
 596         .fops   = &wdtpci_temp_fops,
 597 };
 598
 599 /*
 600  *      The WDT card needs to learn about soft shutdowns in order to
 601  *      turn the timebomb registers off.
 602  */
 603
 604 static struct notifier_block wdtpci_notifier = {
 605         .notifier_call = wdtpci_notify_sys,
 606 };
 607
 608
 609 static int __devinit wdtpci_init_one(struct pci_dev *dev,
 610                                         const struct pci_device_id *ent)
 611 {
 612         int ret = -EIO;
 613
 614         dev_count++;
 615         if (dev_count > 1) {
 616                 pr_err("This driver only supports one device\n");
 617                 return -ENODEV;
 618         }
 619
 620         if (type != 500 && type != 501) {
 621                 pr_err("unknown card type '%d'\n", type);
 622                 return -ENODEV;
 623         }
 624
 625         if (pci_enable_device(dev)) {
 626                 pr_err("Not possible to enable PCI Device\n");
 627                 return -ENODEV;
 628         }
 629
 630         if (pci_resource_start(dev, 2) == 0x0000) {
 631                 pr_err("No I/O-Address for card detected\n");
 632                 ret = -ENODEV;
 633                 goto out_pci;
 634         }
 635
 636         if (pci_request_region(dev, 2, "wdt_pci")) {
 637                 pr_err("I/O address 0x%llx already in use\n",
 638                        (unsigned long long)pci_resource_start(dev, 2));
 639                 goto out_pci;
 640         }
 641
 642         irq = dev->irq;
 643         io = pci_resource_start(dev, 2);
 644
 645         if (request_irq(irq, wdtpci_interrupt, IRQF_SHARED,
 646                          "wdt_pci", &wdtpci_miscdev)) {
 647                 pr_err("IRQ %d is not free\n", irq);
 648                 goto out_reg;
 649         }
 650
 651         pr_info("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%llx (Interrupt %d)\n",
 652                 (unsigned long long)io, irq);
 653
 654         /* Check that the heartbeat value is within its range;
 655            if not reset to the default */
 656         if (wdtpci_set_heartbeat(heartbeat)) {
 657                 wdtpci_set_heartbeat(WD_TIMO);
 658                 pr_info("heartbeat value must be 0 < heartbeat < 65536, using %d\n",
 659                         WD_TIMO);
 660         }
 661
 662         ret = register_reboot_notifier(&wdtpci_notifier);
 663         if (ret) {
 664                 pr_err("cannot register reboot notifier (err=%d)\n", ret);
 665                 goto out_irq;
 666         }
 667
 668         if (type == 501) {
 669                 ret = misc_register(&temp_miscdev);
 670                 if (ret) {
 671                         pr_err("cannot register miscdev on minor=%d (err=%d)\n",
 672                                TEMP_MINOR, ret);
 673                         goto out_rbt;
 674                 }
 675         }
 676
 677         ret = misc_register(&wdtpci_miscdev);
 678         if (ret) {
 679                 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
 680                        WATCHDOG_MINOR, ret);
 681                 goto out_misc;
 682         }
 683
 684         pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
 685                 heartbeat, nowayout);
 686         if (type == 501)
 687                 pr_info("Fan Tachometer is %s\n",
 688                         tachometer ? "Enabled" : "Disabled");
 689
 690         ret = 0;
 691 out:
 692         return ret;
 693
 694 out_misc:
 695         if (type == 501)
 696                 misc_deregister(&temp_miscdev);
 697 out_rbt:
 698         unregister_reboot_notifier(&wdtpci_notifier);
 699 out_irq:
 700         free_irq(irq, &wdtpci_miscdev);
 701 out_reg:
 702         pci_release_region(dev, 2);
 703 out_pci:
 704         pci_disable_device(dev);
 705         goto out;
 706 }
 707
 708
 709 static void __devexit wdtpci_remove_one(struct pci_dev *pdev)
 710 {
 711         /* here we assume only one device will ever have
 712          * been picked up and registered by probe function */
 713         misc_deregister(&wdtpci_miscdev);
 714         if (type == 501)
 715                 misc_deregister(&temp_miscdev);
 716         unregister_reboot_notifier(&wdtpci_notifier);
 717         free_irq(irq, &wdtpci_miscdev);
 718         pci_release_region(pdev, 2);
 719         pci_disable_device(pdev);
 720         dev_count--;
 721 }
 722
 723
 724 static DEFINE_PCI_DEVICE_TABLE(wdtpci_pci_tbl) = {
 725         {
 726                 .vendor    = PCI_VENDOR_ID_ACCESSIO,
 727                 .device    = PCI_DEVICE_ID_ACCESSIO_WDG_CSM,
 728                 .subvendor = PCI_ANY_ID,
 729                 .subdevice = PCI_ANY_ID,
 730         },
 731         { 0, }, /* terminate list */
 732 };
 733 MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl);
 734
 735
 736 static struct pci_driver wdtpci_driver = {
 737         .name           = "wdt_pci",
 738         .id_table       = wdtpci_pci_tbl,
 739         .probe          = wdtpci_init_one,
 740         .remove         = __devexit_p(wdtpci_remove_one),
 741 };
 742
 743
 744 /**
 745  *      wdtpci_cleanup:
 746  *
 747  *      Unload the watchdog. You cannot do this with any file handles open.
 748  *      If your watchdog is set to continue ticking on close and you unload
 749  *      it, well it keeps ticking. We won't get the interrupt but the board
 750  *      will not touch PC memory so all is fine. You just have to load a new
 751  *      module in xx seconds or reboot.
 752  */
 753
 754 static void __exit wdtpci_cleanup(void)
 755 {
 756         pci_unregister_driver(&wdtpci_driver);
 757 }
 758
 759
 760 /**
 761  *      wdtpci_init:
 762  *
 763  *      Set up the WDT watchdog board. All we have to do is grab the
 764  *      resources we require and bitch if anyone beat us to them.
 765  *      The open() function will actually kick the board off.
 766  */
 767
 768 static int __init wdtpci_init(void)
 769 {
 770         return pci_register_driver(&wdtpci_driver);
 771 }
 772
 773
 774 module_init(wdtpci_init);
 775 module_exit(wdtpci_cleanup);
 776
 777 MODULE_AUTHOR("JP Nollmann, Alan Cox");
 778 MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards");
 779 MODULE_LICENSE("GPL");
 780 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 781 MODULE_ALIAS_MISCDEV(TEMP_MINOR);