drivers/char/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/config.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/module.h>
  41 #include <linux/moduleparam.h>
  42 #include <linux/types.h>
  43 #include <linux/miscdevice.h>
  44 #include <linux/watchdog.h>
  45 #include <linux/ioport.h>
  46 #include <linux/notifier.h>
  47 #include <linux/reboot.h>
  48 #include <linux/init.h>
  49 #include <linux/fs.h>
  50 #include <linux/pci.h>
  51
  52 #include <asm/io.h>
  53 #include <asm/uaccess.h>
  54 #include <asm/system.h>
  55
  56 #define WDT_IS_PCI
  57 #include "wd501p.h"
  58
  59 #define PFX "wdt_pci: "
  60
  61 /*
  62  * Until Access I/O gets their application for a PCI vendor ID approved,
  63  * I don't think that it's appropriate to move these constants into the
  64  * regular pci_ids.h file. -- JPN 2000/01/18
  65  */
  66
  67 #ifndef PCI_VENDOR_ID_ACCESSIO
  68 #define PCI_VENDOR_ID_ACCESSIO 0x494f
  69 #endif
  70 #ifndef PCI_DEVICE_ID_WDG_CSM
  71 #define PCI_DEVICE_ID_WDG_CSM 0x22c0
  72 #endif
  73
  74 /* We can only use 1 card due to the /dev/watchdog restriction */
  75 static int dev_count;
  76
  77 static struct semaphore open_sem;
  78 static spinlock_t wdtpci_lock;
  79 static char expect_close;
  80
  81 static int io;
  82 static int irq;
  83
  84 /* Default timeout */
  85 #define WD_TIMO 60                      /* Default heartbeat = 60 seconds */
  86
  87 static int heartbeat = WD_TIMO;
  88 static int wd_heartbeat;
  89 module_param(heartbeat, int, 0);
  90 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WD_TIMO) ")");
  91
  92 #ifdef CONFIG_WATCHDOG_NOWAYOUT
  93 static int nowayout = 1;
  94 #else
  95 static int nowayout = 0;
  96 #endif
  97
  98 module_param(nowayout, int, 0);
  99 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
 100
 101 #ifdef CONFIG_WDT_501_PCI
 102 /* Support for the Fan Tachometer on the PCI-WDT501 */
 103 static int tachometer;
 104
 105 module_param(tachometer, int, 0);
 106 MODULE_PARM_DESC(tachometer, "PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
 107 #endif /* CONFIG_WDT_501_PCI */
 108
 109 /*
 110  *      Programming support
 111  */
 112
 113 static void wdtpci_ctr_mode(int ctr, int mode)
 114 {
 115         ctr<<=6;
 116         ctr|=0x30;
 117         ctr|=(mode<<1);
 118         outb_p(ctr, WDT_CR);
 119 }
 120
 121 static void wdtpci_ctr_load(int ctr, int val)
 122 {
 123         outb_p(val&0xFF, WDT_COUNT0+ctr);
 124         outb_p(val>>8, WDT_COUNT0+ctr);
 125 }
 126
 127 /**
 128  *      wdtpci_start:
 129  *
 130  *      Start the watchdog driver.
 131  */
 132
 133 static int wdtpci_start(void)
 134 {
 135         unsigned long flags;
 136
 137         spin_lock_irqsave(&wdtpci_lock, flags);
 138
 139         /*
 140          * "pet" the watchdog, as Access says.
 141          * This resets the clock outputs.
 142          */
 143         inb_p(WDT_DC);                  /* Disable watchdog */
 144         wdtpci_ctr_mode(2,0);           /* Program CTR2 for Mode 0: Pulse on Terminal Count */
 145         outb_p(0, WDT_DC);              /* Enable watchdog */
 146
 147         inb_p(WDT_DC);                  /* Disable watchdog */
 148         outb_p(0, WDT_CLOCK);           /* 2.0833MHz clock */
 149         inb_p(WDT_BUZZER);              /* disable */
 150         inb_p(WDT_OPTONOTRST);          /* disable */
 151         inb_p(WDT_OPTORST);             /* disable */
 152         inb_p(WDT_PROGOUT);             /* disable */
 153         wdtpci_ctr_mode(0,3);           /* Program CTR0 for Mode 3: Square Wave Generator */
 154         wdtpci_ctr_mode(1,2);           /* Program CTR1 for Mode 2: Rate Generator */
 155         wdtpci_ctr_mode(2,1);           /* Program CTR2 for Mode 1: Retriggerable One-Shot */
 156         wdtpci_ctr_load(0,20833);       /* count at 100Hz */
 157         wdtpci_ctr_load(1,wd_heartbeat);/* Heartbeat */
 158         /* DO NOT LOAD CTR2 on PCI card! -- JPN */
 159         outb_p(0, WDT_DC);              /* Enable watchdog */
 160
 161         spin_unlock_irqrestore(&wdtpci_lock, flags);
 162         return 0;
 163 }
 164
 165 /**
 166  *      wdtpci_stop:
 167  *
 168  *      Stop the watchdog driver.
 169  */
 170
 171 static int wdtpci_stop (void)
 172 {
 173         unsigned long flags;
 174
 175         /* Turn the card off */
 176         spin_lock_irqsave(&wdtpci_lock, flags);
 177         inb_p(WDT_DC);                  /* Disable watchdog */
 178         wdtpci_ctr_load(2,0);           /* 0 length reset pulses now */
 179         spin_unlock_irqrestore(&wdtpci_lock, flags);
 180         return 0;
 181 }
 182
 183 /**
 184  *      wdtpci_ping:
 185  *
 186  *      Reload counter one with the watchdog heartbeat. We don't bother reloading
 187  *      the cascade counter.
 188  */
 189
 190 static int wdtpci_ping(void)
 191 {
 192         unsigned long flags;
 193
 194         /* Write a watchdog value */
 195         spin_lock_irqsave(&wdtpci_lock, flags);
 196         inb_p(WDT_DC);                  /* Disable watchdog */
 197         wdtpci_ctr_mode(1,2);           /* Re-Program CTR1 for Mode 2: Rate Generator */
 198         wdtpci_ctr_load(1,wd_heartbeat);/* Heartbeat */
 199         outb_p(0, WDT_DC);              /* Enable watchdog */
 200         spin_unlock_irqrestore(&wdtpci_lock, flags);
 201         return 0;
 202 }
 203
 204 /**
 205  *      wdtpci_set_heartbeat:
 206  *      @t:             the new heartbeat value that needs to be set.
 207  *
 208  *      Set a new heartbeat value for the watchdog device. If the heartbeat value is
 209  *      incorrect we keep the old value and return -EINVAL. If successfull we
 210  *      return 0.
 211  */
 212 static int wdtpci_set_heartbeat(int t)
 213 {
 214         /* Arbitrary, can't find the card's limits */
 215         if ((t < 1) || (t > 65535))
 216                 return -EINVAL;
 217
 218         heartbeat = t;
 219         wd_heartbeat = t * 100;
 220         return 0;
 221 }
 222
 223 /**
 224  *      wdtpci_get_status:
 225  *      @status:                the new status.
 226  *
 227  *      Extract the status information from a WDT watchdog device. There are
 228  *      several board variants so we have to know which bits are valid. Some
 229  *      bits default to one and some to zero in order to be maximally painful.
 230  *
 231  *      we then map the bits onto the status ioctl flags.
 232  */
 233
 234 static int wdtpci_get_status(int *status)
 235 {
 236         unsigned char new_status=inb_p(WDT_SR);
 237
 238         *status=0;
 239         if (new_status & WDC_SR_ISOI0)
 240                 *status |= WDIOF_EXTERN1;
 241         if (new_status & WDC_SR_ISII1)
 242                 *status |= WDIOF_EXTERN2;
 243 #ifdef CONFIG_WDT_501_PCI
 244         if (!(new_status & WDC_SR_TGOOD))
 245                 *status |= WDIOF_OVERHEAT;
 246         if (!(new_status & WDC_SR_PSUOVER))
 247                 *status |= WDIOF_POWEROVER;
 248         if (!(new_status & WDC_SR_PSUUNDR))
 249                 *status |= WDIOF_POWERUNDER;
 250         if (tachometer) {
 251                 if (!(new_status & WDC_SR_FANGOOD))
 252                         *status |= WDIOF_FANFAULT;
 253         }
 254 #endif /* CONFIG_WDT_501_PCI */
 255         return 0;
 256 }
 257
 258 #ifdef CONFIG_WDT_501_PCI
 259 /**
 260  *      wdtpci_get_temperature:
 261  *
 262  *      Reports the temperature in degrees Fahrenheit. The API is in
 263  *      farenheit. It was designed by an imperial measurement luddite.
 264  */
 265
 266 static int wdtpci_get_temperature(int *temperature)
 267 {
 268         unsigned short c=inb_p(WDT_RT);
 269
 270         *temperature = (c * 11 / 15) + 7;
 271         return 0;
 272 }
 273 #endif /* CONFIG_WDT_501_PCI */
 274
 275 /**
 276  *      wdtpci_interrupt:
 277  *      @irq:           Interrupt number
 278  *      @dev_id:        Unused as we don't allow multiple devices.
 279  *      @regs:          Unused.
 280  *
 281  *      Handle an interrupt from the board. These are raised when the status
 282  *      map changes in what the board considers an interesting way. That means
 283  *      a failure condition occurring.
 284  */
 285
 286 static irqreturn_t wdtpci_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 287 {
 288         /*
 289          *      Read the status register see what is up and
 290          *      then printk it.
 291          */
 292         unsigned char status=inb_p(WDT_SR);
 293
 294         printk(KERN_CRIT PFX "status %d\n", status);
 295
 296 #ifdef CONFIG_WDT_501_PCI
 297         if (!(status & WDC_SR_TGOOD))
 298                 printk(KERN_CRIT PFX "Overheat alarm.(%d)\n",inb_p(WDT_RT));
 299         if (!(status & WDC_SR_PSUOVER))
 300                 printk(KERN_CRIT PFX "PSU over voltage.\n");
 301         if (!(status & WDC_SR_PSUUNDR))
 302                 printk(KERN_CRIT PFX "PSU under voltage.\n");
 303         if (tachometer) {
 304                 if (!(status & WDC_SR_FANGOOD))
 305                         printk(KERN_CRIT PFX "Possible fan fault.\n");
 306         }
 307 #endif /* CONFIG_WDT_501_PCI */
 308         if (!(status&WDC_SR_WCCR))
 309 #ifdef SOFTWARE_REBOOT
 310 #ifdef ONLY_TESTING
 311                 printk(KERN_CRIT PFX "Would Reboot.\n");
 312 #else
 313                 printk(KERN_CRIT PFX "Initiating system reboot.\n");
 314                 machine_restart(NULL);
 315 #endif
 316 #else
 317                 printk(KERN_CRIT PFX "Reset in 5ms.\n");
 318 #endif
 319         return IRQ_HANDLED;
 320 }
 321
 322
 323 /**
 324  *      wdtpci_write:
 325  *      @file: file handle to the watchdog
 326  *      @buf: buffer to write (unused as data does not matter here
 327  *      @count: count of bytes
 328  *      @ppos: pointer to the position to write. No seeks allowed
 329  *
 330  *      A write to a watchdog device is defined as a keepalive signal. Any
 331  *      write of data will do, as we we don't define content meaning.
 332  */
 333
 334 static ssize_t wdtpci_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 335 {
 336         if (count) {
 337                 if (!nowayout) {
 338                         size_t i;
 339
 340                         expect_close = 0;
 341
 342                         for (i = 0; i != count; i++) {
 343                                 char c;
 344                                 if(get_user(c, buf+i))
 345                                         return -EFAULT;
 346                                 if (c == 'V')
 347                                         expect_close = 42;
 348                         }
 349                 }
 350                 wdtpci_ping();
 351         }
 352
 353         return count;
 354 }
 355
 356 /**
 357  *      wdtpci_ioctl:
 358  *      @inode: inode of the device
 359  *      @file: file handle to the device
 360  *      @cmd: watchdog command
 361  *      @arg: argument pointer
 362  *
 363  *      The watchdog API defines a common set of functions for all watchdogs
 364  *      according to their available features. We only actually usefully support
 365  *      querying capabilities and current status.
 366  */
 367
 368 static int wdtpci_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 369         unsigned long arg)
 370 {
 371         int new_heartbeat;
 372         int status;
 373         void __user *argp = (void __user *)arg;
 374         int __user *p = argp;
 375
 376         static struct watchdog_info ident = {
 377                 .options =              WDIOF_SETTIMEOUT|
 378                                         WDIOF_MAGICCLOSE|
 379                                         WDIOF_KEEPALIVEPING,
 380                 .firmware_version =     1,
 381                 .identity =             "PCI-WDT500/501",
 382         };
 383
 384         /* Add options according to the card we have */
 385         ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
 386 #ifdef CONFIG_WDT_501_PCI
 387         ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER);
 388         if (tachometer)
 389                 ident.options |= WDIOF_FANFAULT;
 390 #endif /* CONFIG_WDT_501_PCI */
 391
 392         switch(cmd)
 393         {
 394                 default:
 395                         return -ENOIOCTLCMD;
 396                 case WDIOC_GETSUPPORT:
 397                         return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0;
 398
 399                 case WDIOC_GETSTATUS:
 400                         wdtpci_get_status(&status);
 401                         return put_user(status, p);
 402                 case WDIOC_GETBOOTSTATUS:
 403                         return put_user(0, p);
 404                 case WDIOC_KEEPALIVE:
 405                         wdtpci_ping();
 406                         return 0;
 407                 case WDIOC_SETTIMEOUT:
 408                         if (get_user(new_heartbeat, p))
 409                                 return -EFAULT;
 410
 411                         if (wdtpci_set_heartbeat(new_heartbeat))
 412                                 return -EINVAL;
 413
 414                         wdtpci_ping();
 415                         /* Fall */
 416                 case WDIOC_GETTIMEOUT:
 417                         return put_user(heartbeat, p);
 418         }
 419 }
 420
 421 /**
 422  *      wdtpci_open:
 423  *      @inode: inode of device
 424  *      @file: file handle to device
 425  *
 426  *      The watchdog device has been opened. The watchdog device is single
 427  *      open and on opening we load the counters. Counter zero is a 100Hz
 428  *      cascade, into counter 1 which downcounts to reboot. When the counter
 429  *      triggers counter 2 downcounts the length of the reset pulse which
 430  *      set set to be as long as possible.
 431  */
 432
 433 static int wdtpci_open(struct inode *inode, struct file *file)
 434 {
 435         if (down_trylock(&open_sem))
 436                 return -EBUSY;
 437
 438         if (nowayout) {
 439                 __module_get(THIS_MODULE);
 440         }
 441         /*
 442          *      Activate
 443          */
 444         wdtpci_start();
 445         return nonseekable_open(inode, file);
 446 }
 447
 448 /**
 449  *      wdtpci_release:
 450  *      @inode: inode to board
 451  *      @file: file handle to board
 452  *
 453  *      The watchdog has a configurable API. There is a religious dispute
 454  *      between people who want their watchdog to be able to shut down and
 455  *      those who want to be sure if the watchdog manager dies the machine
 456  *      reboots. In the former case we disable the counters, in the latter
 457  *      case you have to open it again very soon.
 458  */
 459
 460 static int wdtpci_release(struct inode *inode, struct file *file)
 461 {
 462         if (expect_close == 42) {
 463                 wdtpci_stop();
 464         } else {
 465                 printk(KERN_CRIT PFX "Unexpected close, not stopping timer!");
 466                 wdtpci_ping();
 467         }
 468         expect_close = 0;
 469         up(&open_sem);
 470         return 0;
 471 }
 472
 473 #ifdef CONFIG_WDT_501_PCI
 474 /**
 475  *      wdtpci_temp_read:
 476  *      @file: file handle to the watchdog board
 477  *      @buf: buffer to write 1 byte into
 478  *      @count: length of buffer
 479  *      @ptr: offset (no seek allowed)
 480  *
 481  *      Read reports the temperature in degrees Fahrenheit. The API is in
 482  *      fahrenheit. It was designed by an imperial measurement luddite.
 483  */
 484
 485 static ssize_t wdtpci_temp_read(struct file *file, char __user *buf, size_t count, loff_t *ptr)
 486 {
 487         int temperature;
 488
 489         if (wdtpci_get_temperature(&temperature))
 490                 return -EFAULT;
 491
 492         if (copy_to_user (buf, &temperature, 1))
 493                 return -EFAULT;
 494
 495         return 1;
 496 }
 497
 498 /**
 499  *      wdtpci_temp_open:
 500  *      @inode: inode of device
 501  *      @file: file handle to device
 502  *
 503  *      The temperature device has been opened.
 504  */
 505
 506 static int wdtpci_temp_open(struct inode *inode, struct file *file)
 507 {
 508         return nonseekable_open(inode, file);
 509 }
 510
 511 /**
 512  *      wdtpci_temp_release:
 513  *      @inode: inode to board
 514  *      @file: file handle to board
 515  *
 516  *      The temperature device has been closed.
 517  */
 518
 519 static int wdtpci_temp_release(struct inode *inode, struct file *file)
 520 {
 521         return 0;
 522 }
 523 #endif /* CONFIG_WDT_501_PCI */
 524
 525 /**
 526  *      notify_sys:
 527  *      @this: our notifier block
 528  *      @code: the event being reported
 529  *      @unused: unused
 530  *
 531  *      Our notifier is called on system shutdowns. We want to turn the card
 532  *      off at reboot otherwise the machine will reboot again during memory
 533  *      test or worse yet during the following fsck. This would suck, in fact
 534  *      trust me - if it happens it does suck.
 535  */
 536
 537 static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code,
 538         void *unused)
 539 {
 540         if (code==SYS_DOWN || code==SYS_HALT) {
 541                 /* Turn the card off */
 542                 wdtpci_stop();
 543         }
 544         return NOTIFY_DONE;
 545 }
 546
 547 /*
 548  *      Kernel Interfaces
 549  */
 550
 551
 552 static struct file_operations wdtpci_fops = {
 553         .owner          = THIS_MODULE,
 554         .llseek         = no_llseek,
 555         .write          = wdtpci_write,
 556         .ioctl          = wdtpci_ioctl,
 557         .open           = wdtpci_open,
 558         .release        = wdtpci_release,
 559 };
 560
 561 static struct miscdevice wdtpci_miscdev = {
 562         .minor  = WATCHDOG_MINOR,
 563         .name   = "watchdog",
 564         .fops   = &wdtpci_fops,
 565 };
 566
 567 #ifdef CONFIG_WDT_501_PCI
 568 static struct file_operations wdtpci_temp_fops = {
 569         .owner          = THIS_MODULE,
 570         .llseek         = no_llseek,
 571         .read           = wdtpci_temp_read,
 572         .open           = wdtpci_temp_open,
 573         .release        = wdtpci_temp_release,
 574 };
 575
 576 static struct miscdevice temp_miscdev = {
 577         .minor  = TEMP_MINOR,
 578         .name   = "temperature",
 579         .fops   = &wdtpci_temp_fops,
 580 };
 581 #endif /* CONFIG_WDT_501_PCI */
 582
 583 /*
 584  *      The WDT card needs to learn about soft shutdowns in order to
 585  *      turn the timebomb registers off.
 586  */
 587
 588 static struct notifier_block wdtpci_notifier = {
 589         .notifier_call = wdtpci_notify_sys,
 590 };
 591
 592
 593 static int __devinit wdtpci_init_one (struct pci_dev *dev,
 594                                    const struct pci_device_id *ent)
 595 {
 596         int ret = -EIO;
 597
 598         dev_count++;
 599         if (dev_count > 1) {
 600                 printk (KERN_ERR PFX "this driver only supports 1 device\n");
 601                 return -ENODEV;
 602         }
 603
 604         if (pci_enable_device (dev)) {
 605                 printk (KERN_ERR PFX "Not possible to enable PCI Device\n");
 606                 return -ENODEV;
 607         }
 608
 609         if (pci_resource_start (dev, 2) == 0x0000) {
 610                 printk (KERN_ERR PFX "No I/O-Address for card detected\n");
 611                 ret = -ENODEV;
 612                 goto out_pci;
 613         }
 614
 615         sema_init(&open_sem, 1);
 616         spin_lock_init(&wdtpci_lock);
 617
 618         irq = dev->irq;
 619         io = pci_resource_start (dev, 2);
 620
 621         if (request_region (io, 16, "wdt_pci") == NULL) {
 622                 printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", io);
 623                 goto out_pci;
 624         }
 625
 626         if (request_irq (irq, wdtpci_interrupt, SA_INTERRUPT | SA_SHIRQ,
 627                          "wdt_pci", &wdtpci_miscdev)) {
 628                 printk (KERN_ERR PFX "IRQ %d is not free\n", irq);
 629                 goto out_reg;
 630         }
 631
 632         printk ("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%04x (Interrupt %d)\n",
 633                 io, irq);
 634
 635         /* Check that the heartbeat value is within it's range ; if not reset to the default */
 636         if (wdtpci_set_heartbeat(heartbeat)) {
 637                 wdtpci_set_heartbeat(WD_TIMO);
 638                 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
 639                         WD_TIMO);
 640         }
 641
 642         ret = register_reboot_notifier (&wdtpci_notifier);
 643         if (ret) {
 644                 printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", ret);
 645                 goto out_irq;
 646         }
 647
 648 #ifdef CONFIG_WDT_501_PCI
 649         ret = misc_register (&temp_miscdev);
 650         if (ret) {
 651                 printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 652                         TEMP_MINOR, ret);
 653                 goto out_rbt;
 654         }
 655 #endif /* CONFIG_WDT_501_PCI */
 656
 657         ret = misc_register (&wdtpci_miscdev);
 658         if (ret) {
 659                 printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 660                         WATCHDOG_MINOR, ret);
 661                 goto out_misc;
 662         }
 663
 664         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 665                 heartbeat, nowayout);
 666 #ifdef CONFIG_WDT_501_PCI
 667         printk(KERN_INFO "wdt: Fan Tachometer is %s\n", (tachometer ? "Enabled" : "Disabled"));
 668 #endif /* CONFIG_WDT_501_PCI */
 669
 670         ret = 0;
 671 out:
 672         return ret;
 673
 674 out_misc:
 675 #ifdef CONFIG_WDT_501_PCI
 676         misc_deregister(&temp_miscdev);
 677 out_rbt:
 678 #endif /* CONFIG_WDT_501_PCI */
 679         unregister_reboot_notifier(&wdtpci_notifier);
 680 out_irq:
 681         free_irq(irq, &wdtpci_miscdev);
 682 out_reg:
 683         release_region (io, 16);
 684 out_pci:
 685         pci_disable_device(dev);
 686         goto out;
 687 }
 688
 689
 690 static void __devexit wdtpci_remove_one (struct pci_dev *pdev)
 691 {
 692         /* here we assume only one device will ever have
 693          * been picked up and registered by probe function */
 694         misc_deregister(&wdtpci_miscdev);
 695 #ifdef CONFIG_WDT_501_PCI
 696         misc_deregister(&temp_miscdev);
 697 #endif /* CONFIG_WDT_501_PCI */
 698         unregister_reboot_notifier(&wdtpci_notifier);
 699         free_irq(irq, &wdtpci_miscdev);
 700         release_region(io, 16);
 701         pci_disable_device(pdev);
 702         dev_count--;
 703 }
 704
 705
 706 static struct pci_device_id wdtpci_pci_tbl[] = {
 707         {
 708                 .vendor    = PCI_VENDOR_ID_ACCESSIO,
 709                 .device    = PCI_DEVICE_ID_WDG_CSM,
 710                 .subvendor = PCI_ANY_ID,
 711                 .subdevice = PCI_ANY_ID,
 712         },
 713         { 0, }, /* terminate list */
 714 };
 715 MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl);
 716
 717
 718 static struct pci_driver wdtpci_driver = {
 719         .name           = "wdt_pci",
 720         .id_table       = wdtpci_pci_tbl,
 721         .probe          = wdtpci_init_one,
 722         .remove         = __devexit_p(wdtpci_remove_one),
 723 };
 724
 725
 726 /**
 727  *      wdtpci_cleanup:
 728  *
 729  *      Unload the watchdog. You cannot do this with any file handles open.
 730  *      If your watchdog is set to continue ticking on close and you unload
 731  *      it, well it keeps ticking. We won't get the interrupt but the board
 732  *      will not touch PC memory so all is fine. You just have to load a new
 733  *      module in xx seconds or reboot.
 734  */
 735
 736 static void __exit wdtpci_cleanup(void)
 737 {
 738         pci_unregister_driver (&wdtpci_driver);
 739 }
 740
 741
 742 /**
 743  *      wdtpci_init:
 744  *
 745  *      Set up the WDT watchdog board. All we have to do is grab the
 746  *      resources we require and bitch if anyone beat us to them.
 747  *      The open() function will actually kick the board off.
 748  */
 749
 750 static int __init wdtpci_init(void)
 751 {
 752         return pci_register_driver (&wdtpci_driver);
 753 }
 754
 755
 756 module_init(wdtpci_init);
 757 module_exit(wdtpci_cleanup);
 758
 759 MODULE_AUTHOR("JP Nollmann, Alan Cox");
 760 MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards");
 761 MODULE_LICENSE("GPL");
 762 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 763 MODULE_ALIAS_MISCDEV(TEMP_MINOR);