drivers/watchdog/wdt_pci.c

   1 /*
   2  *      Industrial Computer Source PCI-WDT500/501 driver
   3  *
   4  *      (c) Copyright 1996-1997 Alan Cox <alan@redhat.com>, All Rights Reserved.
   5  *                              http://www.redhat.com
   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 failures
  33  *              Joel Becker     :       Added WDIOC_GET/SETTIMEOUT
  34  *              Zwane Mwaikambo :       Magic char closing, locking changes, cleanups
  35  *              Matt Domsch     :       nowayout module option
  36  */
  37
  38 #include <linux/interrupt.h>
  39 #include <linux/module.h>
  40 #include <linux/moduleparam.h>
  41 #include <linux/types.h>
  42 #include <linux/miscdevice.h>
  43 #include <linux/watchdog.h>
  44 #include <linux/ioport.h>
  45 #include <linux/notifier.h>
  46 #include <linux/reboot.h>
  47 #include <linux/init.h>
  48 #include <linux/fs.h>
  49 #include <linux/pci.h>
  50
  51 #include <asm/io.h>
  52 #include <asm/uaccess.h>
  53 #include <asm/system.h>
  54
  55 #define WDT_IS_PCI
  56 #include "wd501p.h"
  57
  58 #define PFX "wdt_pci: "
  59
  60 /*
  61  * Until Access I/O gets their application for a PCI vendor ID approved,
  62  * I don't think that it's appropriate to move these constants into the
  63  * regular pci_ids.h file. -- JPN 2000/01/18
  64  */
  65
  66 #ifndef PCI_VENDOR_ID_ACCESSIO
  67 #define PCI_VENDOR_ID_ACCESSIO 0x494f
  68 #endif
  69 #ifndef PCI_DEVICE_ID_WDG_CSM
  70 #define PCI_DEVICE_ID_WDG_CSM 0x22c0
  71 #endif
  72
  73 /* We can only use 1 card due to the /dev/watchdog restriction */
  74 static int dev_count;
  75
  76 static struct semaphore open_sem;
  77 static DEFINE_SPINLOCK(wdtpci_lock);
  78 static char expect_close;
  79
  80 static int io;
  81 static int irq;
  82
  83 /* Default timeout */
  84 #define WD_TIMO 60                      /* Default heartbeat = 60 seconds */
  85
  86 static int heartbeat = WD_TIMO;
  87 static int wd_heartbeat;
  88 module_param(heartbeat, int, 0);
  89 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WD_TIMO) ")");
  90
  91 static int nowayout = WATCHDOG_NOWAYOUT;
  92 module_param(nowayout, int, 0);
  93 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
  94
  95 #ifdef CONFIG_WDT_501_PCI
  96 /* Support for the Fan Tachometer on the PCI-WDT501 */
  97 static int tachometer;
  98
  99 module_param(tachometer, int, 0);
 100 MODULE_PARM_DESC(tachometer, "PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
 101 #endif /* CONFIG_WDT_501_PCI */
 102
 103 /*
 104  *      Programming support
 105  */
 106
 107 static void wdtpci_ctr_mode(int ctr, int mode)
 108 {
 109         ctr<<=6;
 110         ctr|=0x30;
 111         ctr|=(mode<<1);
 112         outb_p(ctr, WDT_CR);
 113 }
 114
 115 static void wdtpci_ctr_load(int ctr, int val)
 116 {
 117         outb_p(val&0xFF, WDT_COUNT0+ctr);
 118         outb_p(val>>8, WDT_COUNT0+ctr);
 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_p(WDT_DC);                  /* Disable watchdog */
 138         wdtpci_ctr_mode(2,0);           /* Program CTR2 for Mode 0: Pulse on Terminal Count */
 139         outb_p(0, WDT_DC);              /* Enable watchdog */
 140
 141         inb_p(WDT_DC);                  /* Disable watchdog */
 142         outb_p(0, WDT_CLOCK);           /* 2.0833MHz clock */
 143         inb_p(WDT_BUZZER);              /* disable */
 144         inb_p(WDT_OPTONOTRST);          /* disable */
 145         inb_p(WDT_OPTORST);             /* disable */
 146         inb_p(WDT_PROGOUT);             /* disable */
 147         wdtpci_ctr_mode(0,3);           /* Program CTR0 for Mode 3: Square Wave Generator */
 148         wdtpci_ctr_mode(1,2);           /* Program CTR1 for Mode 2: Rate Generator */
 149         wdtpci_ctr_mode(2,1);           /* Program CTR2 for Mode 1: Retriggerable One-Shot */
 150         wdtpci_ctr_load(0,20833);       /* count at 100Hz */
 151         wdtpci_ctr_load(1,wd_heartbeat);/* Heartbeat */
 152         /* DO NOT LOAD CTR2 on PCI card! -- JPN */
 153         outb_p(0, WDT_DC);              /* Enable watchdog */
 154
 155         spin_unlock_irqrestore(&wdtpci_lock, flags);
 156         return 0;
 157 }
 158
 159 /**
 160  *      wdtpci_stop:
 161  *
 162  *      Stop the watchdog driver.
 163  */
 164
 165 static int wdtpci_stop (void)
 166 {
 167         unsigned long flags;
 168
 169         /* Turn the card off */
 170         spin_lock_irqsave(&wdtpci_lock, flags);
 171         inb_p(WDT_DC);                  /* Disable watchdog */
 172         wdtpci_ctr_load(2,0);           /* 0 length reset pulses now */
 173         spin_unlock_irqrestore(&wdtpci_lock, flags);
 174         return 0;
 175 }
 176
 177 /**
 178  *      wdtpci_ping:
 179  *
 180  *      Reload counter one with the watchdog heartbeat. We don't bother reloading
 181  *      the cascade counter.
 182  */
 183
 184 static int wdtpci_ping(void)
 185 {
 186         unsigned long flags;
 187
 188         /* Write a watchdog value */
 189         spin_lock_irqsave(&wdtpci_lock, flags);
 190         inb_p(WDT_DC);                  /* Disable watchdog */
 191         wdtpci_ctr_mode(1,2);           /* Re-Program CTR1 for Mode 2: Rate Generator */
 192         wdtpci_ctr_load(1,wd_heartbeat);/* Heartbeat */
 193         outb_p(0, WDT_DC);              /* Enable watchdog */
 194         spin_unlock_irqrestore(&wdtpci_lock, flags);
 195         return 0;
 196 }
 197
 198 /**
 199  *      wdtpci_set_heartbeat:
 200  *      @t:             the new heartbeat value that needs to be set.
 201  *
 202  *      Set a new heartbeat value for the watchdog device. If the heartbeat value is
 203  *      incorrect we keep the old value and return -EINVAL. If successfull we
 204  *      return 0.
 205  */
 206 static int wdtpci_set_heartbeat(int t)
 207 {
 208         /* Arbitrary, can't find the card's limits */
 209         if ((t < 1) || (t > 65535))
 210                 return -EINVAL;
 211
 212         heartbeat = t;
 213         wd_heartbeat = t * 100;
 214         return 0;
 215 }
 216
 217 /**
 218  *      wdtpci_get_status:
 219  *      @status:                the new status.
 220  *
 221  *      Extract the status information from a WDT watchdog device. There are
 222  *      several board variants so we have to know which bits are valid. Some
 223  *      bits default to one and some to zero in order to be maximally painful.
 224  *
 225  *      we then map the bits onto the status ioctl flags.
 226  */
 227
 228 static int wdtpci_get_status(int *status)
 229 {
 230         unsigned char new_status=inb_p(WDT_SR);
 231
 232         *status=0;
 233         if (new_status & WDC_SR_ISOI0)
 234                 *status |= WDIOF_EXTERN1;
 235         if (new_status & WDC_SR_ISII1)
 236                 *status |= WDIOF_EXTERN2;
 237 #ifdef CONFIG_WDT_501_PCI
 238         if (!(new_status & WDC_SR_TGOOD))
 239                 *status |= WDIOF_OVERHEAT;
 240         if (!(new_status & WDC_SR_PSUOVER))
 241                 *status |= WDIOF_POWEROVER;
 242         if (!(new_status & WDC_SR_PSUUNDR))
 243                 *status |= WDIOF_POWERUNDER;
 244         if (tachometer) {
 245                 if (!(new_status & WDC_SR_FANGOOD))
 246                         *status |= WDIOF_FANFAULT;
 247         }
 248 #endif /* CONFIG_WDT_501_PCI */
 249         return 0;
 250 }
 251
 252 #ifdef CONFIG_WDT_501_PCI
 253 /**
 254  *      wdtpci_get_temperature:
 255  *
 256  *      Reports the temperature in degrees Fahrenheit. The API is in
 257  *      farenheit. It was designed by an imperial measurement luddite.
 258  */
 259
 260 static int wdtpci_get_temperature(int *temperature)
 261 {
 262         unsigned short c=inb_p(WDT_RT);
 263
 264         *temperature = (c * 11 / 15) + 7;
 265         return 0;
 266 }
 267 #endif /* CONFIG_WDT_501_PCI */
 268
 269 /**
 270  *      wdtpci_interrupt:
 271  *      @irq:           Interrupt number
 272  *      @dev_id:        Unused as we don't allow multiple devices.
 273  *
 274  *      Handle an interrupt from the board. These are raised when the status
 275  *      map changes in what the board considers an interesting way. That means
 276  *      a failure condition occurring.
 277  */
 278
 279 static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
 280 {
 281         /*
 282          *      Read the status register see what is up and
 283          *      then printk it.
 284          */
 285         unsigned char status=inb_p(WDT_SR);
 286
 287         printk(KERN_CRIT PFX "status %d\n", status);
 288
 289 #ifdef CONFIG_WDT_501_PCI
 290         if (!(status & WDC_SR_TGOOD))
 291                 printk(KERN_CRIT PFX "Overheat alarm.(%d)\n",inb_p(WDT_RT));
 292         if (!(status & WDC_SR_PSUOVER))
 293                 printk(KERN_CRIT PFX "PSU over voltage.\n");
 294         if (!(status & WDC_SR_PSUUNDR))
 295                 printk(KERN_CRIT PFX "PSU under voltage.\n");
 296         if (tachometer) {
 297                 if (!(status & WDC_SR_FANGOOD))
 298                         printk(KERN_CRIT PFX "Possible fan fault.\n");
 299         }
 300 #endif /* CONFIG_WDT_501_PCI */
 301         if (!(status&WDC_SR_WCCR)) {
 302 #ifdef SOFTWARE_REBOOT
 303 #ifdef ONLY_TESTING
 304                 printk(KERN_CRIT PFX "Would Reboot.\n");
 305 #else
 306                 printk(KERN_CRIT PFX "Initiating system reboot.\n");
 307                 emergency_restart(NULL);
 308 #endif
 309 #else
 310                 printk(KERN_CRIT PFX "Reset in 5ms.\n");
 311 #endif
 312         }
 313         return IRQ_HANDLED;
 314 }
 315
 316
 317 /**
 318  *      wdtpci_write:
 319  *      @file: file handle to the watchdog
 320  *      @buf: buffer to write (unused as data does not matter here
 321  *      @count: count of bytes
 322  *      @ppos: pointer to the position to write. No seeks allowed
 323  *
 324  *      A write to a watchdog device is defined as a keepalive signal. Any
 325  *      write of data will do, as we we don't define content meaning.
 326  */
 327
 328 static ssize_t wdtpci_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 329 {
 330         if (count) {
 331                 if (!nowayout) {
 332                         size_t i;
 333
 334                         expect_close = 0;
 335
 336                         for (i = 0; i != count; i++) {
 337                                 char c;
 338                                 if(get_user(c, buf+i))
 339                                         return -EFAULT;
 340                                 if (c == 'V')
 341                                         expect_close = 42;
 342                         }
 343                 }
 344                 wdtpci_ping();
 345         }
 346
 347         return count;
 348 }
 349
 350 /**
 351  *      wdtpci_ioctl:
 352  *      @inode: inode of the device
 353  *      @file: file handle to the device
 354  *      @cmd: watchdog command
 355  *      @arg: argument pointer
 356  *
 357  *      The watchdog API defines a common set of functions for all watchdogs
 358  *      according to their available features. We only actually usefully support
 359  *      querying capabilities and current status.
 360  */
 361
 362 static int wdtpci_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 363         unsigned long arg)
 364 {
 365         int new_heartbeat;
 366         int status;
 367         void __user *argp = (void __user *)arg;
 368         int __user *p = argp;
 369
 370         static struct watchdog_info ident = {
 371                 .options =              WDIOF_SETTIMEOUT|
 372                                         WDIOF_MAGICCLOSE|
 373                                         WDIOF_KEEPALIVEPING,
 374                 .firmware_version =     1,
 375                 .identity =             "PCI-WDT500/501",
 376         };
 377
 378         /* Add options according to the card we have */
 379         ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
 380 #ifdef CONFIG_WDT_501_PCI
 381         ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER);
 382         if (tachometer)
 383                 ident.options |= WDIOF_FANFAULT;
 384 #endif /* CONFIG_WDT_501_PCI */
 385
 386         switch(cmd)
 387         {
 388                 default:
 389                         return -ENOTTY;
 390                 case WDIOC_GETSUPPORT:
 391                         return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0;
 392
 393                 case WDIOC_GETSTATUS:
 394                         wdtpci_get_status(&status);
 395                         return put_user(status, p);
 396                 case WDIOC_GETBOOTSTATUS:
 397                         return put_user(0, p);
 398                 case WDIOC_KEEPALIVE:
 399                         wdtpci_ping();
 400                         return 0;
 401                 case WDIOC_SETTIMEOUT:
 402                         if (get_user(new_heartbeat, p))
 403                                 return -EFAULT;
 404
 405                         if (wdtpci_set_heartbeat(new_heartbeat))
 406                                 return -EINVAL;
 407
 408                         wdtpci_ping();
 409                         /* Fall */
 410                 case WDIOC_GETTIMEOUT:
 411                         return put_user(heartbeat, p);
 412         }
 413 }
 414
 415 /**
 416  *      wdtpci_open:
 417  *      @inode: inode of device
 418  *      @file: file handle to device
 419  *
 420  *      The watchdog device has been opened. The watchdog device is single
 421  *      open and on opening we load the counters. Counter zero is a 100Hz
 422  *      cascade, into counter 1 which downcounts to reboot. When the counter
 423  *      triggers counter 2 downcounts the length of the reset pulse which
 424  *      set set to be as long as possible.
 425  */
 426
 427 static int wdtpci_open(struct inode *inode, struct file *file)
 428 {
 429         if (down_trylock(&open_sem))
 430                 return -EBUSY;
 431
 432         if (nowayout) {
 433                 __module_get(THIS_MODULE);
 434         }
 435         /*
 436          *      Activate
 437          */
 438         wdtpci_start();
 439         return nonseekable_open(inode, file);
 440 }
 441
 442 /**
 443  *      wdtpci_release:
 444  *      @inode: inode to board
 445  *      @file: file handle to board
 446  *
 447  *      The watchdog has a configurable API. There is a religious dispute
 448  *      between people who want their watchdog to be able to shut down and
 449  *      those who want to be sure if the watchdog manager dies the machine
 450  *      reboots. In the former case we disable the counters, in the latter
 451  *      case you have to open it again very soon.
 452  */
 453
 454 static int wdtpci_release(struct inode *inode, struct file *file)
 455 {
 456         if (expect_close == 42) {
 457                 wdtpci_stop();
 458         } else {
 459                 printk(KERN_CRIT PFX "Unexpected close, not stopping timer!");
 460                 wdtpci_ping();
 461         }
 462         expect_close = 0;
 463         up(&open_sem);
 464         return 0;
 465 }
 466
 467 #ifdef CONFIG_WDT_501_PCI
 468 /**
 469  *      wdtpci_temp_read:
 470  *      @file: file handle to the watchdog board
 471  *      @buf: buffer to write 1 byte into
 472  *      @count: length of buffer
 473  *      @ptr: offset (no seek allowed)
 474  *
 475  *      Read reports the temperature in degrees Fahrenheit. The API is in
 476  *      fahrenheit. It was designed by an imperial measurement luddite.
 477  */
 478
 479 static ssize_t wdtpci_temp_read(struct file *file, char __user *buf, size_t count, loff_t *ptr)
 480 {
 481         int temperature;
 482
 483         if (wdtpci_get_temperature(&temperature))
 484                 return -EFAULT;
 485
 486         if (copy_to_user (buf, &temperature, 1))
 487                 return -EFAULT;
 488
 489         return 1;
 490 }
 491
 492 /**
 493  *      wdtpci_temp_open:
 494  *      @inode: inode of device
 495  *      @file: file handle to device
 496  *
 497  *      The temperature device has been opened.
 498  */
 499
 500 static int wdtpci_temp_open(struct inode *inode, struct file *file)
 501 {
 502         return nonseekable_open(inode, file);
 503 }
 504
 505 /**
 506  *      wdtpci_temp_release:
 507  *      @inode: inode to board
 508  *      @file: file handle to board
 509  *
 510  *      The temperature device has been closed.
 511  */
 512
 513 static int wdtpci_temp_release(struct inode *inode, struct file *file)
 514 {
 515         return 0;
 516 }
 517 #endif /* CONFIG_WDT_501_PCI */
 518
 519 /**
 520  *      notify_sys:
 521  *      @this: our notifier block
 522  *      @code: the event being reported
 523  *      @unused: unused
 524  *
 525  *      Our notifier is called on system shutdowns. We want to turn the card
 526  *      off at reboot otherwise the machine will reboot again during memory
 527  *      test or worse yet during the following fsck. This would suck, in fact
 528  *      trust me - if it happens it does suck.
 529  */
 530
 531 static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code,
 532         void *unused)
 533 {
 534         if (code==SYS_DOWN || code==SYS_HALT) {
 535                 /* Turn the card off */
 536                 wdtpci_stop();
 537         }
 538         return NOTIFY_DONE;
 539 }
 540
 541 /*
 542  *      Kernel Interfaces
 543  */
 544
 545
 546 static const struct file_operations wdtpci_fops = {
 547         .owner          = THIS_MODULE,
 548         .llseek         = no_llseek,
 549         .write          = wdtpci_write,
 550         .ioctl          = wdtpci_ioctl,
 551         .open           = wdtpci_open,
 552         .release        = wdtpci_release,
 553 };
 554
 555 static struct miscdevice wdtpci_miscdev = {
 556         .minor  = WATCHDOG_MINOR,
 557         .name   = "watchdog",
 558         .fops   = &wdtpci_fops,
 559 };
 560
 561 #ifdef CONFIG_WDT_501_PCI
 562 static const struct file_operations wdtpci_temp_fops = {
 563         .owner          = THIS_MODULE,
 564         .llseek         = no_llseek,
 565         .read           = wdtpci_temp_read,
 566         .open           = wdtpci_temp_open,
 567         .release        = wdtpci_temp_release,
 568 };
 569
 570 static struct miscdevice temp_miscdev = {
 571         .minor  = TEMP_MINOR,
 572         .name   = "temperature",
 573         .fops   = &wdtpci_temp_fops,
 574 };
 575 #endif /* CONFIG_WDT_501_PCI */
 576
 577 /*
 578  *      The WDT card needs to learn about soft shutdowns in order to
 579  *      turn the timebomb registers off.
 580  */
 581
 582 static struct notifier_block wdtpci_notifier = {
 583         .notifier_call = wdtpci_notify_sys,
 584 };
 585
 586
 587 static int __devinit wdtpci_init_one (struct pci_dev *dev,
 588                                    const struct pci_device_id *ent)
 589 {
 590         int ret = -EIO;
 591
 592         dev_count++;
 593         if (dev_count > 1) {
 594                 printk (KERN_ERR PFX "this driver only supports 1 device\n");
 595                 return -ENODEV;
 596         }
 597
 598         if (pci_enable_device (dev)) {
 599                 printk (KERN_ERR PFX "Not possible to enable PCI Device\n");
 600                 return -ENODEV;
 601         }
 602
 603         if (pci_resource_start (dev, 2) == 0x0000) {
 604                 printk (KERN_ERR PFX "No I/O-Address for card detected\n");
 605                 ret = -ENODEV;
 606                 goto out_pci;
 607         }
 608
 609         sema_init(&open_sem, 1);
 610
 611         irq = dev->irq;
 612         io = pci_resource_start (dev, 2);
 613
 614         if (request_region (io, 16, "wdt_pci") == NULL) {
 615                 printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", io);
 616                 goto out_pci;
 617         }
 618
 619         if (request_irq (irq, wdtpci_interrupt, IRQF_DISABLED | IRQF_SHARED,
 620                          "wdt_pci", &wdtpci_miscdev)) {
 621                 printk (KERN_ERR PFX "IRQ %d is not free\n", irq);
 622                 goto out_reg;
 623         }
 624
 625         printk ("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%04x (Interrupt %d)\n",
 626                 io, irq);
 627
 628         /* Check that the heartbeat value is within it's range ; if not reset to the default */
 629         if (wdtpci_set_heartbeat(heartbeat)) {
 630                 wdtpci_set_heartbeat(WD_TIMO);
 631                 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
 632                         WD_TIMO);
 633         }
 634
 635         ret = register_reboot_notifier (&wdtpci_notifier);
 636         if (ret) {
 637                 printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", ret);
 638                 goto out_irq;
 639         }
 640
 641 #ifdef CONFIG_WDT_501_PCI
 642         ret = misc_register (&temp_miscdev);
 643         if (ret) {
 644                 printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 645                         TEMP_MINOR, ret);
 646                 goto out_rbt;
 647         }
 648 #endif /* CONFIG_WDT_501_PCI */
 649
 650         ret = misc_register (&wdtpci_miscdev);
 651         if (ret) {
 652                 printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 653                         WATCHDOG_MINOR, ret);
 654                 goto out_misc;
 655         }
 656
 657         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 658                 heartbeat, nowayout);
 659 #ifdef CONFIG_WDT_501_PCI
 660         printk(KERN_INFO "wdt: Fan Tachometer is %s\n", (tachometer ? "Enabled" : "Disabled"));
 661 #endif /* CONFIG_WDT_501_PCI */
 662
 663         ret = 0;
 664 out:
 665         return ret;
 666
 667 out_misc:
 668 #ifdef CONFIG_WDT_501_PCI
 669         misc_deregister(&temp_miscdev);
 670 out_rbt:
 671 #endif /* CONFIG_WDT_501_PCI */
 672         unregister_reboot_notifier(&wdtpci_notifier);
 673 out_irq:
 674         free_irq(irq, &wdtpci_miscdev);
 675 out_reg:
 676         release_region (io, 16);
 677 out_pci:
 678         pci_disable_device(dev);
 679         goto out;
 680 }
 681
 682
 683 static void __devexit wdtpci_remove_one (struct pci_dev *pdev)
 684 {
 685         /* here we assume only one device will ever have
 686          * been picked up and registered by probe function */
 687         misc_deregister(&wdtpci_miscdev);
 688 #ifdef CONFIG_WDT_501_PCI
 689         misc_deregister(&temp_miscdev);
 690 #endif /* CONFIG_WDT_501_PCI */
 691         unregister_reboot_notifier(&wdtpci_notifier);
 692         free_irq(irq, &wdtpci_miscdev);
 693         release_region(io, 16);
 694         pci_disable_device(pdev);
 695         dev_count--;
 696 }
 697
 698
 699 static struct pci_device_id wdtpci_pci_tbl[] = {
 700         {
 701                 .vendor    = PCI_VENDOR_ID_ACCESSIO,
 702                 .device    = PCI_DEVICE_ID_WDG_CSM,
 703                 .subvendor = PCI_ANY_ID,
 704                 .subdevice = PCI_ANY_ID,
 705         },
 706         { 0, }, /* terminate list */
 707 };
 708 MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl);
 709
 710
 711 static struct pci_driver wdtpci_driver = {
 712         .name           = "wdt_pci",
 713         .id_table       = wdtpci_pci_tbl,
 714         .probe          = wdtpci_init_one,
 715         .remove         = __devexit_p(wdtpci_remove_one),
 716 };
 717
 718
 719 /**
 720  *      wdtpci_cleanup:
 721  *
 722  *      Unload the watchdog. You cannot do this with any file handles open.
 723  *      If your watchdog is set to continue ticking on close and you unload
 724  *      it, well it keeps ticking. We won't get the interrupt but the board
 725  *      will not touch PC memory so all is fine. You just have to load a new
 726  *      module in xx seconds or reboot.
 727  */
 728
 729 static void __exit wdtpci_cleanup(void)
 730 {
 731         pci_unregister_driver (&wdtpci_driver);
 732 }
 733
 734
 735 /**
 736  *      wdtpci_init:
 737  *
 738  *      Set up the WDT watchdog board. All we have to do is grab the
 739  *      resources we require and bitch if anyone beat us to them.
 740  *      The open() function will actually kick the board off.
 741  */
 742
 743 static int __init wdtpci_init(void)
 744 {
 745         return pci_register_driver (&wdtpci_driver);
 746 }
 747
 748
 749 module_init(wdtpci_init);
 750 module_exit(wdtpci_cleanup);
 751
 752 MODULE_AUTHOR("JP Nollmann, Alan Cox");
 753 MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards");
 754 MODULE_LICENSE("GPL");
 755 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 756 MODULE_ALIAS_MISCDEV(TEMP_MINOR);