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