linux/drivers/watchdog/wdt_pci.c
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   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 */
  63static int dev_count;
  64
  65static unsigned long open_lock;
  66static DEFINE_SPINLOCK(wdtpci_lock);
  67static char expect_close;
  68
  69static resource_size_t io;
  70static int irq;
  71
  72/* Default timeout */
  73#define WD_TIMO 60                      /* Default heartbeat = 60 seconds */
  74
  75static int heartbeat = WD_TIMO;
  76static int wd_heartbeat;
  77module_param(heartbeat, int, 0);
  78MODULE_PARM_DESC(heartbeat,
  79                "Watchdog heartbeat in seconds. (0<heartbeat<65536, default="
  80                                __MODULE_STRING(WD_TIMO) ")");
  81
  82static bool nowayout = WATCHDOG_NOWAYOUT;
  83module_param(nowayout, bool, 0);
  84MODULE_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 */
  89static int tachometer;
  90module_param(tachometer, int, 0);
  91MODULE_PARM_DESC(tachometer,
  92                "PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
  93
  94static int type = 500;
  95module_param(type, int, 0);
  96MODULE_PARM_DESC(type,
  97                "PCI-WDT501 Card type (500 or 501 , default=500)");
  98
  99/*
 100 *      Programming support
 101 */
 102
 103static 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
 112static 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
 126static 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
 176static 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
 196static 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 */
 221static 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
 243static 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
 279static 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
 301static 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
 358static 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
 392static 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
 454static 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
 480static 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
 504static 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
 526static 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
 539static 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
 556static 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
 569static 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
 578static struct miscdevice wdtpci_miscdev = {
 579        .minor  = WATCHDOG_MINOR,
 580        .name   = "watchdog",
 581        .fops   = &wdtpci_fops,
 582};
 583
 584static 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
 592static 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
 603static struct notifier_block wdtpci_notifier = {
 604        .notifier_call = wdtpci_notify_sys,
 605};
 606
 607
 608static int __devinit 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;
 690out:
 691        return ret;
 692
 693out_misc:
 694        if (type == 501)
 695                misc_deregister(&temp_miscdev);
 696out_rbt:
 697        unregister_reboot_notifier(&wdtpci_notifier);
 698out_irq:
 699        free_irq(irq, &wdtpci_miscdev);
 700out_reg:
 701        pci_release_region(dev, 2);
 702out_pci:
 703        pci_disable_device(dev);
 704        goto out;
 705}
 706
 707
 708static void __devexit 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
 723static 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};
 732MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl);
 733
 734
 735static struct pci_driver wdtpci_driver = {
 736        .name           = "wdt_pci",
 737        .id_table       = wdtpci_pci_tbl,
 738        .probe          = wdtpci_init_one,
 739        .remove         = __devexit_p(wdtpci_remove_one),
 740};
 741
 742module_pci_driver(wdtpci_driver);
 743
 744MODULE_AUTHOR("JP Nollmann, Alan Cox");
 745MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards");
 746MODULE_LICENSE("GPL");
 747MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 748MODULE_ALIAS_MISCDEV(TEMP_MINOR);
 749
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