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