drivers/watchdog/wdt

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This source file includes following definitions.
wdtpci_ctr_mode
wdtpci_ctr_load
wdtpci_start
wdtpci_stop
wdtpci_ping
wdtpci_set_heartbeat
wdtpci_get_status
wdtpci_get_temperature
wdtpci_interrupt
wdtpci_write
wdtpci_ioctl
wdtpci_open
wdtpci_release
wdtpci_temp_read
wdtpci_temp_open
wdtpci_temp_release
wdtpci_notify_sys
wdtpci_init_one
wdtpci_remove_one
   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *      Industrial Computer Source PCI-WDT500/501 driver
   4  *
   5  *      (c) Copyright 1996-1997 Alan Cox <alan@lxorguk.ukuu.org.uk>,
   6  *                                              All Rights Reserved.
   7  *
   8  *      Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
   9  *      warranty for any of this software. This material is provided
  10  *      "AS-IS" and at no charge.
  11  *
  12  *      (c) Copyright 1995    Alan Cox <alan@lxorguk.ukuu.org.uk>
  13  *
  14  *      Release 0.10.
  15  *
  16  *      Fixes
  17  *              Dave Gregorich  :       Modularisation and minor bugs
  18  *              Alan Cox        :       Added the watchdog ioctl() stuff
  19  *              Alan Cox        :       Fixed the reboot problem (as noted by
  20  *                                      Matt Crocker).
  21  *              Alan Cox        :       Added wdt= boot option
  22  *              Alan Cox        :       Cleaned up copy/user stuff
  23  *              Tim Hockin      :       Added insmod parameters, comment cleanup
  24  *                                      Parameterized timeout
  25  *              JP Nollmann     :       Added support for PCI wdt501p
  26  *              Alan Cox        :       Split ISA and PCI cards into two drivers
  27  *              Jeff Garzik     :       PCI cleanups
  28  *              Tigran Aivazian :       Restructured wdtpci_init_one() to handle
  29  *                                      failures
  30  *              Joel Becker     :       Added WDIOC_GET/SETTIMEOUT
  31  *              Zwane Mwaikambo :       Magic char closing, locking changes,
  32  *                                      cleanups
  33  *              Matt Domsch     :       nowayout module option
  34  */
  35 
  36 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  37 
  38 #include <linux/interrupt.h>
  39 #include <linux/module.h>
  40 #include <linux/moduleparam.h>
  41 #include <linux/types.h>
  42 #include <linux/miscdevice.h>
  43 #include <linux/watchdog.h>
  44 #include <linux/ioport.h>
  45 #include <linux/delay.h>
  46 #include <linux/notifier.h>
  47 #include <linux/reboot.h>
  48 #include <linux/fs.h>
  49 #include <linux/pci.h>
  50 #include <linux/io.h>
  51 #include <linux/uaccess.h>
  52 
  53 
  54 #define WDT_IS_PCI
  55 #include "wd501p.h"
  56 
  57 /* We can only use 1 card due to the /dev/watchdog restriction */
  58 static int dev_count;
  59 
  60 static unsigned long open_lock;
  61 static DEFINE_SPINLOCK(wdtpci_lock);
  62 static char expect_close;
  63 
  64 static resource_size_t io;
  65 static int irq;
  66 
  67 /* Default timeout */
  68 #define WD_TIMO 60                      /* Default heartbeat = 60 seconds */
  69 
  70 static int heartbeat = WD_TIMO;
  71 static int wd_heartbeat;
  72 module_param(heartbeat, int, 0);
  73 MODULE_PARM_DESC(heartbeat,
  74                 "Watchdog heartbeat in seconds. (0<heartbeat<65536, default="
  75                                 __MODULE_STRING(WD_TIMO) ")");
  76 
  77 static bool nowayout = WATCHDOG_NOWAYOUT;
  78 module_param(nowayout, bool, 0);
  79 MODULE_PARM_DESC(nowayout,
  80                 "Watchdog cannot be stopped once started (default="
  81                                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
  82 
  83 /* Support for the Fan Tachometer on the PCI-WDT501 */
  84 static int tachometer;
  85 module_param(tachometer, int, 0);
  86 MODULE_PARM_DESC(tachometer,
  87                 "PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
  88 
  89 static int type = 500;
  90 module_param(type, int, 0);
  91 MODULE_PARM_DESC(type,
  92                 "PCI-WDT501 Card type (500 or 501 , default=500)");
  93 
  94 /*
  95  *      Programming support
  96  */
  97 
  98 static void wdtpci_ctr_mode(int ctr, int mode)
  99 {
 100         ctr <<= 6;
 101         ctr |= 0x30;
 102         ctr |= (mode << 1);
 103         outb(ctr, WDT_CR);
 104         udelay(8);
 105 }
 106 
 107 static void wdtpci_ctr_load(int ctr, int val)
 108 {
 109         outb(val & 0xFF, WDT_COUNT0 + ctr);
 110         udelay(8);
 111         outb(val >> 8, WDT_COUNT0 + ctr);
 112         udelay(8);
 113 }
 114 
 115 /**
 116  *      wdtpci_start:
 117  *
 118  *      Start the watchdog driver.
 119  */
 120 
 121 static int wdtpci_start(void)
 122 {
 123         unsigned long flags;
 124 
 125         spin_lock_irqsave(&wdtpci_lock, flags);
 126 
 127         /*
 128          * "pet" the watchdog, as Access says.
 129          * This resets the clock outputs.
 130          */
 131         inb(WDT_DC);                    /* Disable watchdog */
 132         udelay(8);
 133         wdtpci_ctr_mode(2, 0);          /* Program CTR2 for Mode 0:
 134                                                 Pulse on Terminal Count */
 135         outb(0, WDT_DC);                /* Enable watchdog */
 136         udelay(8);
 137         inb(WDT_DC);                    /* Disable watchdog */
 138         udelay(8);
 139         outb(0, WDT_CLOCK);             /* 2.0833MHz clock */
 140         udelay(8);
 141         inb(WDT_BUZZER);                /* disable */
 142         udelay(8);
 143         inb(WDT_OPTONOTRST);            /* disable */
 144         udelay(8);
 145         inb(WDT_OPTORST);               /* disable */
 146         udelay(8);
 147         inb(WDT_PROGOUT);               /* disable */
 148         udelay(8);
 149         wdtpci_ctr_mode(0, 3);          /* Program CTR0 for Mode 3:
 150                                                 Square Wave Generator */
 151         wdtpci_ctr_mode(1, 2);          /* Program CTR1 for Mode 2:
 152                                                 Rate Generator */
 153         wdtpci_ctr_mode(2, 1);          /* Program CTR2 for Mode 1:
 154                                                 Retriggerable One-Shot */
 155         wdtpci_ctr_load(0, 20833);      /* count at 100Hz */
 156         wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
 157         /* DO NOT LOAD CTR2 on PCI card! -- JPN */
 158         outb(0, WDT_DC);                /* Enable watchdog */
 159         udelay(8);
 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(WDT_DC);                    /* Disable watchdog */
 178         udelay(8);
 179         wdtpci_ctr_load(2, 0);          /* 0 length reset pulses now */
 180         spin_unlock_irqrestore(&wdtpci_lock, flags);
 181         return 0;
 182 }
 183 
 184 /**
 185  *      wdtpci_ping:
 186  *
 187  *      Reload counter one with the watchdog heartbeat. We don't bother
 188  *      reloading the cascade counter.
 189  */
 190 
 191 static int wdtpci_ping(void)
 192 {
 193         unsigned long flags;
 194 
 195         spin_lock_irqsave(&wdtpci_lock, flags);
 196         /* Write a watchdog value */
 197         inb(WDT_DC);                    /* Disable watchdog */
 198         udelay(8);
 199         wdtpci_ctr_mode(1, 2);          /* Re-Program CTR1 for Mode 2:
 200                                                         Rate Generator */
 201         wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
 202         outb(0, WDT_DC);                /* Enable watchdog */
 203         udelay(8);
 204         spin_unlock_irqrestore(&wdtpci_lock, flags);
 205         return 0;
 206 }
 207 
 208 /**
 209  *      wdtpci_set_heartbeat:
 210  *      @t:             the new heartbeat value that needs to be set.
 211  *
 212  *      Set a new heartbeat value for the watchdog device. If the heartbeat
 213  *      value is incorrect we keep the old value and return -EINVAL.
 214  *      If successful we return 0.
 215  */
 216 static int wdtpci_set_heartbeat(int t)
 217 {
 218         /* Arbitrary, can't find the card's limits */
 219         if (t < 1 || t > 65535)
 220                 return -EINVAL;
 221 
 222         heartbeat = t;
 223         wd_heartbeat = t * 100;
 224         return 0;
 225 }
 226 
 227 /**
 228  *      wdtpci_get_status:
 229  *      @status:                the new status.
 230  *
 231  *      Extract the status information from a WDT watchdog device. There are
 232  *      several board variants so we have to know which bits are valid. Some
 233  *      bits default to one and some to zero in order to be maximally painful.
 234  *
 235  *      we then map the bits onto the status ioctl flags.
 236  */
 237 
 238 static int wdtpci_get_status(int *status)
 239 {
 240         unsigned char new_status;
 241         unsigned long flags;
 242 
 243         spin_lock_irqsave(&wdtpci_lock, flags);
 244         new_status = inb(WDT_SR);
 245         spin_unlock_irqrestore(&wdtpci_lock, flags);
 246 
 247         *status = 0;
 248         if (new_status & WDC_SR_ISOI0)
 249                 *status |= WDIOF_EXTERN1;
 250         if (new_status & WDC_SR_ISII1)
 251                 *status |= WDIOF_EXTERN2;
 252         if (type == 501) {
 253                 if (!(new_status & WDC_SR_TGOOD))
 254                         *status |= WDIOF_OVERHEAT;
 255                 if (!(new_status & WDC_SR_PSUOVER))
 256                         *status |= WDIOF_POWEROVER;
 257                 if (!(new_status & WDC_SR_PSUUNDR))
 258                         *status |= WDIOF_POWERUNDER;
 259                 if (tachometer) {
 260                         if (!(new_status & WDC_SR_FANGOOD))
 261                                 *status |= WDIOF_FANFAULT;
 262                 }
 263         }
 264         return 0;
 265 }
 266 
 267 /**
 268  *      wdtpci_get_temperature:
 269  *
 270  *      Reports the temperature in degrees Fahrenheit. The API is in
 271  *      farenheit. It was designed by an imperial measurement luddite.
 272  */
 273 
 274 static int wdtpci_get_temperature(int *temperature)
 275 {
 276         unsigned short c;
 277         unsigned long flags;
 278         spin_lock_irqsave(&wdtpci_lock, flags);
 279         c = inb(WDT_RT);
 280         udelay(8);
 281         spin_unlock_irqrestore(&wdtpci_lock, flags);
 282         *temperature = (c * 11 / 15) + 7;
 283         return 0;
 284 }
 285 
 286 /**
 287  *      wdtpci_interrupt:
 288  *      @irq:           Interrupt number
 289  *      @dev_id:        Unused as we don't allow multiple devices.
 290  *
 291  *      Handle an interrupt from the board. These are raised when the status
 292  *      map changes in what the board considers an interesting way. That means
 293  *      a failure condition occurring.
 294  */
 295 
 296 static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
 297 {
 298         /*
 299          *      Read the status register see what is up and
 300          *      then printk it.
 301          */
 302         unsigned char status;
 303 
 304         spin_lock(&wdtpci_lock);
 305 
 306         status = inb(WDT_SR);
 307         udelay(8);
 308 
 309         pr_crit("status %d\n", status);
 310 
 311         if (type == 501) {
 312                 if (!(status & WDC_SR_TGOOD)) {
 313                         pr_crit("Overheat alarm (%d)\n", inb(WDT_RT));
 314                         udelay(8);
 315                 }
 316                 if (!(status & WDC_SR_PSUOVER))
 317                         pr_crit("PSU over voltage\n");
 318                 if (!(status & WDC_SR_PSUUNDR))
 319                         pr_crit("PSU under voltage\n");
 320                 if (tachometer) {
 321                         if (!(status & WDC_SR_FANGOOD))
 322                                 pr_crit("Possible fan fault\n");
 323                 }
 324         }
 325         if (!(status & WDC_SR_WCCR)) {
 326 #ifdef SOFTWARE_REBOOT
 327 #ifdef ONLY_TESTING
 328                 pr_crit("Would Reboot\n");
 329 #else
 330                 pr_crit("Initiating system reboot\n");
 331                 emergency_restart();
 332 #endif
 333 #else
 334                 pr_crit("Reset in 5ms\n");
 335 #endif
 336         }
 337         spin_unlock(&wdtpci_lock);
 338         return IRQ_HANDLED;
 339 }
 340 
 341 
 342 /**
 343  *      wdtpci_write:
 344  *      @file: file handle to the watchdog
 345  *      @buf: buffer to write (unused as data does not matter here
 346  *      @count: count of bytes
 347  *      @ppos: pointer to the position to write. No seeks allowed
 348  *
 349  *      A write to a watchdog device is defined as a keepalive signal. Any
 350  *      write of data will do, as we we don't define content meaning.
 351  */
 352 
 353 static ssize_t wdtpci_write(struct file *file, const char __user *buf,
 354                                                 size_t count, loff_t *ppos)
 355 {
 356         if (count) {
 357                 if (!nowayout) {
 358                         size_t i;
 359 
 360                         /* In case it was set long ago */
 361                         expect_close = 0;
 362 
 363                         for (i = 0; i != count; i++) {
 364                                 char c;
 365                                 if (get_user(c, buf + i))
 366                                         return -EFAULT;
 367                                 if (c == 'V')
 368                                         expect_close = 42;
 369                         }
 370                 }
 371                 wdtpci_ping();
 372         }
 373         return count;
 374 }
 375 
 376 /**
 377  *      wdtpci_ioctl:
 378  *      @file: file handle to the device
 379  *      @cmd: watchdog command
 380  *      @arg: argument pointer
 381  *
 382  *      The watchdog API defines a common set of functions for all watchdogs
 383  *      according to their available features. We only actually usefully support
 384  *      querying capabilities and current status.
 385  */
 386 
 387 static long wdtpci_ioctl(struct file *file, unsigned int cmd,
 388                                                         unsigned long arg)
 389 {
 390         void __user *argp = (void __user *)arg;
 391         int __user *p = argp;
 392         int new_heartbeat;
 393         int status;
 394 
 395         struct watchdog_info ident = {
 396                 .options =              WDIOF_SETTIMEOUT|
 397                                         WDIOF_MAGICCLOSE|
 398                                         WDIOF_KEEPALIVEPING,
 399                 .firmware_version =     1,
 400                 .identity =             "PCI-WDT500/501",
 401         };
 402 
 403         /* Add options according to the card we have */
 404         ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
 405         if (type == 501) {
 406                 ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|
 407                                                         WDIOF_POWEROVER);
 408                 if (tachometer)
 409                         ident.options |= WDIOF_FANFAULT;
 410         }
 411 
 412         switch (cmd) {
 413         case WDIOC_GETSUPPORT:
 414                 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
 415         case WDIOC_GETSTATUS:
 416                 wdtpci_get_status(&status);
 417                 return put_user(status, p);
 418         case WDIOC_GETBOOTSTATUS:
 419                 return put_user(0, p);
 420         case WDIOC_KEEPALIVE:
 421                 wdtpci_ping();
 422                 return 0;
 423         case WDIOC_SETTIMEOUT:
 424                 if (get_user(new_heartbeat, p))
 425                         return -EFAULT;
 426                 if (wdtpci_set_heartbeat(new_heartbeat))
 427                         return -EINVAL;
 428                 wdtpci_ping();
 429                 /* fall through */
 430         case WDIOC_GETTIMEOUT:
 431                 return put_user(heartbeat, p);
 432         default:
 433                 return -ENOTTY;
 434         }
 435 }
 436 
 437 /**
 438  *      wdtpci_open:
 439  *      @inode: inode of device
 440  *      @file: file handle to device
 441  *
 442  *      The watchdog device has been opened. The watchdog device is single
 443  *      open and on opening we load the counters. Counter zero is a 100Hz
 444  *      cascade, into counter 1 which downcounts to reboot. When the counter
 445  *      triggers counter 2 downcounts the length of the reset pulse which
 446  *      set set to be as long as possible.
 447  */
 448 
 449 static int wdtpci_open(struct inode *inode, struct file *file)
 450 {
 451         if (test_and_set_bit(0, &open_lock))
 452                 return -EBUSY;
 453 
 454         if (nowayout)
 455                 __module_get(THIS_MODULE);
 456         /*
 457          *      Activate
 458          */
 459         wdtpci_start();
 460         return stream_open(inode, file);
 461 }
 462 
 463 /**
 464  *      wdtpci_release:
 465  *      @inode: inode to board
 466  *      @file: file handle to board
 467  *
 468  *      The watchdog has a configurable API. There is a religious dispute
 469  *      between people who want their watchdog to be able to shut down and
 470  *      those who want to be sure if the watchdog manager dies the machine
 471  *      reboots. In the former case we disable the counters, in the latter
 472  *      case you have to open it again very soon.
 473  */
 474 
 475 static int wdtpci_release(struct inode *inode, struct file *file)
 476 {
 477         if (expect_close == 42) {
 478                 wdtpci_stop();
 479         } else {
 480                 pr_crit("Unexpected close, not stopping timer!\n");
 481                 wdtpci_ping();
 482         }
 483         expect_close = 0;
 484         clear_bit(0, &open_lock);
 485         return 0;
 486 }
 487 
 488 /**
 489  *      wdtpci_temp_read:
 490  *      @file: file handle to the watchdog board
 491  *      @buf: buffer to write 1 byte into
 492  *      @count: length of buffer
 493  *      @ptr: offset (no seek allowed)
 494  *
 495  *      Read reports the temperature in degrees Fahrenheit. The API is in
 496  *      fahrenheit. It was designed by an imperial measurement luddite.
 497  */
 498 
 499 static ssize_t wdtpci_temp_read(struct file *file, char __user *buf,
 500                                                 size_t count, loff_t *ptr)
 501 {
 502         int temperature;
 503 
 504         if (wdtpci_get_temperature(&temperature))
 505                 return -EFAULT;
 506 
 507         if (copy_to_user(buf, &temperature, 1))
 508                 return -EFAULT;
 509 
 510         return 1;
 511 }
 512 
 513 /**
 514  *      wdtpci_temp_open:
 515  *      @inode: inode of device
 516  *      @file: file handle to device
 517  *
 518  *      The temperature device has been opened.
 519  */
 520 
 521 static int wdtpci_temp_open(struct inode *inode, struct file *file)
 522 {
 523         return stream_open(inode, file);
 524 }
 525 
 526 /**
 527  *      wdtpci_temp_release:
 528  *      @inode: inode to board
 529  *      @file: file handle to board
 530  *
 531  *      The temperature device has been closed.
 532  */
 533 
 534 static int wdtpci_temp_release(struct inode *inode, struct file *file)
 535 {
 536         return 0;
 537 }
 538 
 539 /**
 540  *      notify_sys:
 541  *      @this: our notifier block
 542  *      @code: the event being reported
 543  *      @unused: unused
 544  *
 545  *      Our notifier is called on system shutdowns. We want to turn the card
 546  *      off at reboot otherwise the machine will reboot again during memory
 547  *      test or worse yet during the following fsck. This would suck, in fact
 548  *      trust me - if it happens it does suck.
 549  */
 550 
 551 static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code,
 552                                                         void *unused)
 553 {
 554         if (code == SYS_DOWN || code == SYS_HALT)
 555                 wdtpci_stop();
 556         return NOTIFY_DONE;
 557 }
 558 
 559 /*
 560  *      Kernel Interfaces
 561  */
 562 
 563 
 564 static const struct file_operations wdtpci_fops = {
 565         .owner          = THIS_MODULE,
 566         .llseek         = no_llseek,
 567         .write          = wdtpci_write,
 568         .unlocked_ioctl = wdtpci_ioctl,
 569         .open           = wdtpci_open,
 570         .release        = wdtpci_release,
 571 };
 572 
 573 static struct miscdevice wdtpci_miscdev = {
 574         .minor  = WATCHDOG_MINOR,
 575         .name   = "watchdog",
 576         .fops   = &wdtpci_fops,
 577 };
 578 
 579 static const struct file_operations wdtpci_temp_fops = {
 580         .owner          = THIS_MODULE,
 581         .llseek         = no_llseek,
 582         .read           = wdtpci_temp_read,
 583         .open           = wdtpci_temp_open,
 584         .release        = wdtpci_temp_release,
 585 };
 586 
 587 static struct miscdevice temp_miscdev = {
 588         .minor  = TEMP_MINOR,
 589         .name   = "temperature",
 590         .fops   = &wdtpci_temp_fops,
 591 };
 592 
 593 /*
 594  *      The WDT card needs to learn about soft shutdowns in order to
 595  *      turn the timebomb registers off.
 596  */
 597 
 598 static struct notifier_block wdtpci_notifier = {
 599         .notifier_call = wdtpci_notify_sys,
 600 };
 601 
 602 
 603 static int wdtpci_init_one(struct pci_dev *dev,
 604                                         const struct pci_device_id *ent)
 605 {
 606         int ret = -EIO;
 607 
 608         dev_count++;
 609         if (dev_count > 1) {
 610                 pr_err("This driver only supports one device\n");
 611                 return -ENODEV;
 612         }
 613 
 614         if (type != 500 && type != 501) {
 615                 pr_err("unknown card type '%d'\n", type);
 616                 return -ENODEV;
 617         }
 618 
 619         if (pci_enable_device(dev)) {
 620                 pr_err("Not possible to enable PCI Device\n");
 621                 return -ENODEV;
 622         }
 623 
 624         if (pci_resource_start(dev, 2) == 0x0000) {
 625                 pr_err("No I/O-Address for card detected\n");
 626                 ret = -ENODEV;
 627                 goto out_pci;
 628         }
 629 
 630         if (pci_request_region(dev, 2, "wdt_pci")) {
 631                 pr_err("I/O address 0x%llx already in use\n",
 632                        (unsigned long long)pci_resource_start(dev, 2));
 633                 goto out_pci;
 634         }
 635 
 636         irq = dev->irq;
 637         io = pci_resource_start(dev, 2);
 638 
 639         if (request_irq(irq, wdtpci_interrupt, IRQF_SHARED,
 640                          "wdt_pci", &wdtpci_miscdev)) {
 641                 pr_err("IRQ %d is not free\n", irq);
 642                 goto out_reg;
 643         }
 644 
 645         pr_info("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%llx (Interrupt %d)\n",
 646                 (unsigned long long)io, irq);
 647 
 648         /* Check that the heartbeat value is within its range;
 649            if not reset to the default */
 650         if (wdtpci_set_heartbeat(heartbeat)) {
 651                 wdtpci_set_heartbeat(WD_TIMO);
 652                 pr_info("heartbeat value must be 0 < heartbeat < 65536, using %d\n",
 653                         WD_TIMO);
 654         }
 655 
 656         ret = register_reboot_notifier(&wdtpci_notifier);
 657         if (ret) {
 658                 pr_err("cannot register reboot notifier (err=%d)\n", ret);
 659                 goto out_irq;
 660         }
 661 
 662         if (type == 501) {
 663                 ret = misc_register(&temp_miscdev);
 664                 if (ret) {
 665                         pr_err("cannot register miscdev on minor=%d (err=%d)\n",
 666                                TEMP_MINOR, ret);
 667                         goto out_rbt;
 668                 }
 669         }
 670 
 671         ret = misc_register(&wdtpci_miscdev);
 672         if (ret) {
 673                 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
 674                        WATCHDOG_MINOR, ret);
 675                 goto out_misc;
 676         }
 677 
 678         pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
 679                 heartbeat, nowayout);
 680         if (type == 501)
 681                 pr_info("Fan Tachometer is %s\n",
 682                         tachometer ? "Enabled" : "Disabled");
 683 
 684         ret = 0;
 685 out:
 686         return ret;
 687 
 688 out_misc:
 689         if (type == 501)
 690                 misc_deregister(&temp_miscdev);
 691 out_rbt:
 692         unregister_reboot_notifier(&wdtpci_notifier);
 693 out_irq:
 694         free_irq(irq, &wdtpci_miscdev);
 695 out_reg:
 696         pci_release_region(dev, 2);
 697 out_pci:
 698         pci_disable_device(dev);
 699         goto out;
 700 }
 701 
 702 
 703 static void wdtpci_remove_one(struct pci_dev *pdev)
 704 {
 705         /* here we assume only one device will ever have
 706          * been picked up and registered by probe function */
 707         misc_deregister(&wdtpci_miscdev);
 708         if (type == 501)
 709                 misc_deregister(&temp_miscdev);
 710         unregister_reboot_notifier(&wdtpci_notifier);
 711         free_irq(irq, &wdtpci_miscdev);
 712         pci_release_region(pdev, 2);
 713         pci_disable_device(pdev);
 714         dev_count--;
 715 }
 716 
 717 
 718 static const struct pci_device_id wdtpci_pci_tbl[] = {
 719         {
 720                 .vendor    = PCI_VENDOR_ID_ACCESSIO,
 721                 .device    = PCI_DEVICE_ID_ACCESSIO_WDG_CSM,
 722                 .subvendor = PCI_ANY_ID,
 723                 .subdevice = PCI_ANY_ID,
 724         },
 725         { 0, }, /* terminate list */
 726 };
 727 MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl);
 728 
 729 
 730 static struct pci_driver wdtpci_driver = {
 731         .name           = "wdt_pci",
 732         .id_table       = wdtpci_pci_tbl,
 733         .probe          = wdtpci_init_one,
 734         .remove         = wdtpci_remove_one,
 735 };
 736 
 737 module_pci_driver(wdtpci_driver);
 738 
 739 MODULE_AUTHOR("JP Nollmann, Alan Cox");
 740 MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards");
 741 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/watchdog/wdt_pci.c

DEFINITIONS
