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 #include <linux/interrupt.h>
  41 #include <linux/module.h>
  42 #include <linux/moduleparam.h>
  43 #include <linux/types.h>
  44 #include <linux/miscdevice.h>
  45 #include <linux/watchdog.h>
  46 #include <linux/ioport.h>
  47 #include <linux/delay.h>
  48 #include <linux/notifier.h>
  49 #include <linux/reboot.h>
  50 #include <linux/init.h>
  51 #include <linux/fs.h>
  52 #include <linux/pci.h>
  53 #include <linux/io.h>
  54 #include <linux/uaccess.h>
  55
  56 #include <asm/system.h>
  57
  58 #define WDT_IS_PCI
  59 #include "wd501p.h"
  60
  61 #define PFX "wdt_pci: "
  62
  63 /*
  64  * Until Access I/O gets their application for a PCI vendor ID approved,
  65  * I don't think that it's appropriate to move these constants into the
  66  * regular pci_ids.h file. -- JPN 2000/01/18
  67  */
  68
  69 #ifndef PCI_VENDOR_ID_ACCESSIO
  70 #define PCI_VENDOR_ID_ACCESSIO 0x494f
  71 #endif
  72 #ifndef PCI_DEVICE_ID_WDG_CSM
  73 #define PCI_DEVICE_ID_WDG_CSM 0x22c0
  74 #endif
  75
  76 /* We can only use 1 card due to the /dev/watchdog restriction */
  77 static int dev_count;
  78
  79 static unsigned long open_lock;
  80 static DEFINE_SPINLOCK(wdtpci_lock);
  81 static char expect_close;
  82
  83 static resource_size_t io;
  84 static int irq;
  85
  86 /* Default timeout */
  87 #define WD_TIMO 60                      /* Default heartbeat = 60 seconds */
  88
  89 static int heartbeat = WD_TIMO;
  90 static int wd_heartbeat;
  91 module_param(heartbeat, int, 0);
  92 MODULE_PARM_DESC(heartbeat,
  93                 "Watchdog heartbeat in seconds. (0<heartbeat<65536, default="
  94                                 __MODULE_STRING(WD_TIMO) ")");
  95
  96 static int nowayout = WATCHDOG_NOWAYOUT;
  97 module_param(nowayout, int, 0);
  98 MODULE_PARM_DESC(nowayout,
  99                 "Watchdog cannot be stopped once started (default="
 100                                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 101
 102 /* Support for the Fan Tachometer on the PCI-WDT501 */
 103 static int tachometer;
 104 module_param(tachometer, int, 0);
 105 MODULE_PARM_DESC(tachometer,
 106                 "PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
 107
 108 static int type = 500;
 109 module_param(type, int, 0);
 110 MODULE_PARM_DESC(type,
 111                 "PCI-WDT501 Card type (500 or 501 , default=500)");
 112
 113 /*
 114  *      Programming support
 115  */
 116
 117 static void wdtpci_ctr_mode(int ctr, int mode)
 118 {
 119         ctr <<= 6;
 120         ctr |= 0x30;
 121         ctr |= (mode << 1);
 122         outb(ctr, WDT_CR);
 123         udelay(8);
 124 }
 125
 126 static void wdtpci_ctr_load(int ctr, int val)
 127 {
 128         outb(val & 0xFF, WDT_COUNT0 + ctr);
 129         udelay(8);
 130         outb(val >> 8, WDT_COUNT0 + ctr);
 131         udelay(8);
 132 }
 133
 134 /**
 135  *      wdtpci_start:
 136  *
 137  *      Start the watchdog driver.
 138  */
 139
 140 static int wdtpci_start(void)
 141 {
 142         unsigned long flags;
 143
 144         spin_lock_irqsave(&wdtpci_lock, flags);
 145
 146         /*
 147          * "pet" the watchdog, as Access says.
 148          * This resets the clock outputs.
 149          */
 150         inb(WDT_DC);                    /* Disable watchdog */
 151         udelay(8);
 152         wdtpci_ctr_mode(2, 0);          /* Program CTR2 for Mode 0:
 153                                                 Pulse on Terminal Count */
 154         outb(0, WDT_DC);                /* Enable watchdog */
 155         udelay(8);
 156         inb(WDT_DC);                    /* Disable watchdog */
 157         udelay(8);
 158         outb(0, WDT_CLOCK);             /* 2.0833MHz clock */
 159         udelay(8);
 160         inb(WDT_BUZZER);                /* disable */
 161         udelay(8);
 162         inb(WDT_OPTONOTRST);            /* disable */
 163         udelay(8);
 164         inb(WDT_OPTORST);               /* disable */
 165         udelay(8);
 166         inb(WDT_PROGOUT);               /* disable */
 167         udelay(8);
 168         wdtpci_ctr_mode(0, 3);          /* Program CTR0 for Mode 3:
 169                                                 Square Wave Generator */
 170         wdtpci_ctr_mode(1, 2);          /* Program CTR1 for Mode 2:
 171                                                 Rate Generator */
 172         wdtpci_ctr_mode(2, 1);          /* Program CTR2 for Mode 1:
 173                                                 Retriggerable One-Shot */
 174         wdtpci_ctr_load(0, 20833);      /* count at 100Hz */
 175         wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
 176         /* DO NOT LOAD CTR2 on PCI card! -- JPN */
 177         outb(0, WDT_DC);                /* Enable watchdog */
 178         udelay(8);
 179
 180         spin_unlock_irqrestore(&wdtpci_lock, flags);
 181         return 0;
 182 }
 183
 184 /**
 185  *      wdtpci_stop:
 186  *
 187  *      Stop the watchdog driver.
 188  */
 189
 190 static int wdtpci_stop(void)
 191 {
 192         unsigned long flags;
 193
 194         /* Turn the card off */
 195         spin_lock_irqsave(&wdtpci_lock, flags);
 196         inb(WDT_DC);                    /* Disable watchdog */
 197         udelay(8);
 198         wdtpci_ctr_load(2, 0);          /* 0 length reset pulses now */
 199         spin_unlock_irqrestore(&wdtpci_lock, flags);
 200         return 0;
 201 }
 202
 203 /**
 204  *      wdtpci_ping:
 205  *
 206  *      Reload counter one with the watchdog heartbeat. We don't bother
 207  *      reloading the cascade counter.
 208  */
 209
 210 static int wdtpci_ping(void)
 211 {
 212         unsigned long flags;
 213
 214         spin_lock_irqsave(&wdtpci_lock, flags);
 215         /* Write a watchdog value */
 216         inb(WDT_DC);                    /* Disable watchdog */
 217         udelay(8);
 218         wdtpci_ctr_mode(1, 2);          /* Re-Program CTR1 for Mode 2:
 219                                                         Rate Generator */
 220         wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
 221         outb(0, WDT_DC);                /* Enable watchdog */
 222         udelay(8);
 223         spin_unlock_irqrestore(&wdtpci_lock, flags);
 224         return 0;
 225 }
 226
 227 /**
 228  *      wdtpci_set_heartbeat:
 229  *      @t:             the new heartbeat value that needs to be set.
 230  *
 231  *      Set a new heartbeat value for the watchdog device. If the heartbeat
 232  *      value is incorrect we keep the old value and return -EINVAL.
 233  *      If successful we return 0.
 234  */
 235 static int wdtpci_set_heartbeat(int t)
 236 {
 237         /* Arbitrary, can't find the card's limits */
 238         if (t < 1 || t > 65535)
 239                 return -EINVAL;
 240
 241         heartbeat = t;
 242         wd_heartbeat = t * 100;
 243         return 0;
 244 }
 245
 246 /**
 247  *      wdtpci_get_status:
 248  *      @status:                the new status.
 249  *
 250  *      Extract the status information from a WDT watchdog device. There are
 251  *      several board variants so we have to know which bits are valid. Some
 252  *      bits default to one and some to zero in order to be maximally painful.
 253  *
 254  *      we then map the bits onto the status ioctl flags.
 255  */
 256
 257 static int wdtpci_get_status(int *status)
 258 {
 259         unsigned char new_status;
 260         unsigned long flags;
 261
 262         spin_lock_irqsave(&wdtpci_lock, flags);
 263         new_status = inb(WDT_SR);
 264         spin_unlock_irqrestore(&wdtpci_lock, flags);
 265
 266         *status = 0;
 267         if (new_status & WDC_SR_ISOI0)
 268                 *status |= WDIOF_EXTERN1;
 269         if (new_status & WDC_SR_ISII1)
 270                 *status |= WDIOF_EXTERN2;
 271         if (type == 501) {
 272                 if (!(new_status & WDC_SR_TGOOD))
 273                         *status |= WDIOF_OVERHEAT;
 274                 if (!(new_status & WDC_SR_PSUOVER))
 275                         *status |= WDIOF_POWEROVER;
 276                 if (!(new_status & WDC_SR_PSUUNDR))
 277                         *status |= WDIOF_POWERUNDER;
 278                 if (tachometer) {
 279                         if (!(new_status & WDC_SR_FANGOOD))
 280                                 *status |= WDIOF_FANFAULT;
 281                 }
 282         }
 283         return 0;
 284 }
 285
 286 /**
 287  *      wdtpci_get_temperature:
 288  *
 289  *      Reports the temperature in degrees Fahrenheit. The API is in
 290  *      farenheit. It was designed by an imperial measurement luddite.
 291  */
 292
 293 static int wdtpci_get_temperature(int *temperature)
 294 {
 295         unsigned short c;
 296         unsigned long flags;
 297         spin_lock_irqsave(&wdtpci_lock, flags);
 298         c = inb(WDT_RT);
 299         udelay(8);
 300         spin_unlock_irqrestore(&wdtpci_lock, flags);
 301         *temperature = (c * 11 / 15) + 7;
 302         return 0;
 303 }
 304
 305 /**
 306  *      wdtpci_interrupt:
 307  *      @irq:           Interrupt number
 308  *      @dev_id:        Unused as we don't allow multiple devices.
 309  *
 310  *      Handle an interrupt from the board. These are raised when the status
 311  *      map changes in what the board considers an interesting way. That means
 312  *      a failure condition occurring.
 313  */
 314
 315 static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
 316 {
 317         /*
 318          *      Read the status register see what is up and
 319          *      then printk it.
 320          */
 321         unsigned char status;
 322
 323         spin_lock(&wdtpci_lock);
 324
 325         status = inb(WDT_SR);
 326         udelay(8);
 327
 328         printk(KERN_CRIT PFX "status %d\n", status);
 329
 330         if (type == 501) {
 331                 if (!(status & WDC_SR_TGOOD)) {
 332                         printk(KERN_CRIT PFX "Overheat alarm.(%d)\n",
 333                                                                 inb(WDT_RT));
 334                         udelay(8);
 335                 }
 336                 if (!(status & WDC_SR_PSUOVER))
 337                         printk(KERN_CRIT PFX "PSU over voltage.\n");
 338                 if (!(status & WDC_SR_PSUUNDR))
 339                         printk(KERN_CRIT PFX "PSU under voltage.\n");
 340                 if (tachometer) {
 341                         if (!(status & WDC_SR_FANGOOD))
 342                                 printk(KERN_CRIT PFX "Possible fan fault.\n");
 343                 }
 344         }
 345         if (!(status & WDC_SR_WCCR)) {
 346 #ifdef SOFTWARE_REBOOT
 347 #ifdef ONLY_TESTING
 348                 printk(KERN_CRIT PFX "Would Reboot.\n");
 349 #else
 350                 printk(KERN_CRIT PFX "Initiating system reboot.\n");
 351                 emergency_restart(NULL);
 352 #endif
 353 #else
 354                 printk(KERN_CRIT PFX "Reset in 5ms.\n");
 355 #endif
 356         }
 357         spin_unlock(&wdtpci_lock);
 358         return IRQ_HANDLED;
 359 }
 360
 361
 362 /**
 363  *      wdtpci_write:
 364  *      @file: file handle to the watchdog
 365  *      @buf: buffer to write (unused as data does not matter here
 366  *      @count: count of bytes
 367  *      @ppos: pointer to the position to write. No seeks allowed
 368  *
 369  *      A write to a watchdog device is defined as a keepalive signal. Any
 370  *      write of data will do, as we we don't define content meaning.
 371  */
 372
 373 static ssize_t wdtpci_write(struct file *file, const char __user *buf,
 374                                                 size_t count, loff_t *ppos)
 375 {
 376         if (count) {
 377                 if (!nowayout) {
 378                         size_t i;
 379
 380                         /* In case it was set long ago */
 381                         expect_close = 0;
 382
 383                         for (i = 0; i != count; i++) {
 384                                 char c;
 385                                 if (get_user(c, buf + i))
 386                                         return -EFAULT;
 387                                 if (c == 'V')
 388                                         expect_close = 42;
 389                         }
 390                 }
 391                 wdtpci_ping();
 392         }
 393         return count;
 394 }
 395
 396 /**
 397  *      wdtpci_ioctl:
 398  *      @file: file handle to the device
 399  *      @cmd: watchdog command
 400  *      @arg: argument pointer
 401  *
 402  *      The watchdog API defines a common set of functions for all watchdogs
 403  *      according to their available features. We only actually usefully support
 404  *      querying capabilities and current status.
 405  */
 406
 407 static long wdtpci_ioctl(struct file *file, unsigned int cmd,
 408                                                         unsigned long arg)
 409 {
 410         void __user *argp = (void __user *)arg;
 411         int __user *p = argp;
 412         int new_heartbeat;
 413         int status;
 414
 415         struct watchdog_info ident = {
 416                 .options =              WDIOF_SETTIMEOUT|
 417                                         WDIOF_MAGICCLOSE|
 418                                         WDIOF_KEEPALIVEPING,
 419                 .firmware_version =     1,
 420                 .identity =             "PCI-WDT500/501",
 421         };
 422
 423         /* Add options according to the card we have */
 424         ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
 425         if (type == 501) {
 426                 ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|
 427                                                         WDIOF_POWEROVER);
 428                 if (tachometer)
 429                         ident.options |= WDIOF_FANFAULT;
 430         }
 431
 432         switch (cmd) {
 433         case WDIOC_GETSUPPORT:
 434                 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
 435         case WDIOC_GETSTATUS:
 436                 wdtpci_get_status(&status);
 437                 return put_user(status, p);
 438         case WDIOC_GETBOOTSTATUS:
 439                 return put_user(0, p);
 440         case WDIOC_KEEPALIVE:
 441                 wdtpci_ping();
 442                 return 0;
 443         case WDIOC_SETTIMEOUT:
 444                 if (get_user(new_heartbeat, p))
 445                         return -EFAULT;
 446                 if (wdtpci_set_heartbeat(new_heartbeat))
 447                         return -EINVAL;
 448                 wdtpci_ping();
 449                 /* Fall */
 450         case WDIOC_GETTIMEOUT:
 451                 return put_user(heartbeat, p);
 452         default:
 453                 return -ENOTTY;
 454         }
 455 }
 456
 457 /**
 458  *      wdtpci_open:
 459  *      @inode: inode of device
 460  *      @file: file handle to device
 461  *
 462  *      The watchdog device has been opened. The watchdog device is single
 463  *      open and on opening we load the counters. Counter zero is a 100Hz
 464  *      cascade, into counter 1 which downcounts to reboot. When the counter
 465  *      triggers counter 2 downcounts the length of the reset pulse which
 466  *      set set to be as long as possible.
 467  */
 468
 469 static int wdtpci_open(struct inode *inode, struct file *file)
 470 {
 471         if (test_and_set_bit(0, &open_lock))
 472                 return -EBUSY;
 473
 474         if (nowayout)
 475                 __module_get(THIS_MODULE);
 476         /*
 477          *      Activate
 478          */
 479         wdtpci_start();
 480         return nonseekable_open(inode, file);
 481 }
 482
 483 /**
 484  *      wdtpci_release:
 485  *      @inode: inode to board
 486  *      @file: file handle to board
 487  *
 488  *      The watchdog has a configurable API. There is a religious dispute
 489  *      between people who want their watchdog to be able to shut down and
 490  *      those who want to be sure if the watchdog manager dies the machine
 491  *      reboots. In the former case we disable the counters, in the latter
 492  *      case you have to open it again very soon.
 493  */
 494
 495 static int wdtpci_release(struct inode *inode, struct file *file)
 496 {
 497         if (expect_close == 42) {
 498                 wdtpci_stop();
 499         } else {
 500                 printk(KERN_CRIT PFX "Unexpected close, not stopping timer!");
 501                 wdtpci_ping();
 502         }
 503         expect_close = 0;
 504         clear_bit(0, &open_lock);
 505         return 0;
 506 }
 507
 508 /**
 509  *      wdtpci_temp_read:
 510  *      @file: file handle to the watchdog board
 511  *      @buf: buffer to write 1 byte into
 512  *      @count: length of buffer
 513  *      @ptr: offset (no seek allowed)
 514  *
 515  *      Read reports the temperature in degrees Fahrenheit. The API is in
 516  *      fahrenheit. It was designed by an imperial measurement luddite.
 517  */
 518
 519 static ssize_t wdtpci_temp_read(struct file *file, char __user *buf,
 520                                                 size_t count, loff_t *ptr)
 521 {
 522         int temperature;
 523
 524         if (wdtpci_get_temperature(&temperature))
 525                 return -EFAULT;
 526
 527         if (copy_to_user(buf, &temperature, 1))
 528                 return -EFAULT;
 529
 530         return 1;
 531 }
 532
 533 /**
 534  *      wdtpci_temp_open:
 535  *      @inode: inode of device
 536  *      @file: file handle to device
 537  *
 538  *      The temperature device has been opened.
 539  */
 540
 541 static int wdtpci_temp_open(struct inode *inode, struct file *file)
 542 {
 543         return nonseekable_open(inode, file);
 544 }
 545
 546 /**
 547  *      wdtpci_temp_release:
 548  *      @inode: inode to board
 549  *      @file: file handle to board
 550  *
 551  *      The temperature device has been closed.
 552  */
 553
 554 static int wdtpci_temp_release(struct inode *inode, struct file *file)
 555 {
 556         return 0;
 557 }
 558
 559 /**
 560  *      notify_sys:
 561  *      @this: our notifier block
 562  *      @code: the event being reported
 563  *      @unused: unused
 564  *
 565  *      Our notifier is called on system shutdowns. We want to turn the card
 566  *      off at reboot otherwise the machine will reboot again during memory
 567  *      test or worse yet during the following fsck. This would suck, in fact
 568  *      trust me - if it happens it does suck.
 569  */
 570
 571 static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code,
 572                                                         void *unused)
 573 {
 574         if (code == SYS_DOWN || code == SYS_HALT)
 575                 wdtpci_stop();
 576         return NOTIFY_DONE;
 577 }
 578
 579 /*
 580  *      Kernel Interfaces
 581  */
 582
 583
 584 static const struct file_operations wdtpci_fops = {
 585         .owner          = THIS_MODULE,
 586         .llseek         = no_llseek,
 587         .write          = wdtpci_write,
 588         .unlocked_ioctl = wdtpci_ioctl,
 589         .open           = wdtpci_open,
 590         .release        = wdtpci_release,
 591 };
 592
 593 static struct miscdevice wdtpci_miscdev = {
 594         .minor  = WATCHDOG_MINOR,
 595         .name   = "watchdog",
 596         .fops   = &wdtpci_fops,
 597 };
 598
 599 static const struct file_operations wdtpci_temp_fops = {
 600         .owner          = THIS_MODULE,
 601         .llseek         = no_llseek,
 602         .read           = wdtpci_temp_read,
 603         .open           = wdtpci_temp_open,
 604         .release        = wdtpci_temp_release,
 605 };
 606
 607 static struct miscdevice temp_miscdev = {
 608         .minor  = TEMP_MINOR,
 609         .name   = "temperature",
 610         .fops   = &wdtpci_temp_fops,
 611 };
 612
 613 /*
 614  *      The WDT card needs to learn about soft shutdowns in order to
 615  *      turn the timebomb registers off.
 616  */
 617
 618 static struct notifier_block wdtpci_notifier = {
 619         .notifier_call = wdtpci_notify_sys,
 620 };
 621
 622
 623 static int __devinit wdtpci_init_one(struct pci_dev *dev,
 624                                         const struct pci_device_id *ent)
 625 {
 626         int ret = -EIO;
 627
 628         dev_count++;
 629         if (dev_count > 1) {
 630                 printk(KERN_ERR PFX "This driver only supports one device\n");
 631                 return -ENODEV;
 632         }
 633
 634         if (type != 500 && type != 501) {
 635                 printk(KERN_ERR PFX "unknown card type '%d'.\n", type);
 636                 return -ENODEV;
 637         }
 638
 639         if (pci_enable_device(dev)) {
 640                 printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
 641                 return -ENODEV;
 642         }
 643
 644         if (pci_resource_start(dev, 2) == 0x0000) {
 645                 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
 646                 ret = -ENODEV;
 647                 goto out_pci;
 648         }
 649
 650         if (pci_request_region(dev, 2, "wdt_pci")) {
 651                 printk(KERN_ERR PFX "I/O address 0x%llx already in use\n",
 652                         (unsigned long long)pci_resource_start(dev, 2));
 653                 goto out_pci;
 654         }
 655
 656         irq = dev->irq;
 657         io = pci_resource_start(dev, 2);
 658
 659         if (request_irq(irq, wdtpci_interrupt, IRQF_DISABLED | IRQF_SHARED,
 660                          "wdt_pci", &wdtpci_miscdev)) {
 661                 printk(KERN_ERR PFX "IRQ %d is not free\n", irq);
 662                 goto out_reg;
 663         }
 664
 665         printk(KERN_INFO
 666          "PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%llx (Interrupt %d)\n",
 667                                         (unsigned long long)io, irq);
 668
 669         /* Check that the heartbeat value is within its range;
 670            if not reset to the default */
 671         if (wdtpci_set_heartbeat(heartbeat)) {
 672                 wdtpci_set_heartbeat(WD_TIMO);
 673                 printk(KERN_INFO PFX
 674                   "heartbeat value must be 0 < heartbeat < 65536, using %d\n",
 675                                                                 WD_TIMO);
 676         }
 677
 678         ret = register_reboot_notifier(&wdtpci_notifier);
 679         if (ret) {
 680                 printk(KERN_ERR PFX
 681                         "cannot register reboot notifier (err=%d)\n", ret);
 682                 goto out_irq;
 683         }
 684
 685         if (type == 501) {
 686                 ret = misc_register(&temp_miscdev);
 687                 if (ret) {
 688                         printk(KERN_ERR PFX
 689                         "cannot register miscdev on minor=%d (err=%d)\n",
 690                                                         TEMP_MINOR, ret);
 691                         goto out_rbt;
 692                 }
 693         }
 694
 695         ret = misc_register(&wdtpci_miscdev);
 696         if (ret) {
 697                 printk(KERN_ERR PFX
 698                         "cannot register miscdev on minor=%d (err=%d)\n",
 699                                                 WATCHDOG_MINOR, ret);
 700                 goto out_misc;
 701         }
 702
 703         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 704                 heartbeat, nowayout);
 705         if (type == 501)
 706                 printk(KERN_INFO "wdt: Fan Tachometer is %s\n",
 707                                 (tachometer ? "Enabled" : "Disabled"));
 708
 709         ret = 0;
 710 out:
 711         return ret;
 712
 713 out_misc:
 714         if (type == 501)
 715                 misc_deregister(&temp_miscdev);
 716 out_rbt:
 717         unregister_reboot_notifier(&wdtpci_notifier);
 718 out_irq:
 719         free_irq(irq, &wdtpci_miscdev);
 720 out_reg:
 721         pci_release_region(dev, 2);
 722 out_pci:
 723         pci_disable_device(dev);
 724         goto out;
 725 }
 726
 727
 728 static void __devexit wdtpci_remove_one(struct pci_dev *pdev)
 729 {
 730         /* here we assume only one device will ever have
 731          * been picked up and registered by probe function */
 732         misc_deregister(&wdtpci_miscdev);
 733         if (type == 501)
 734                 misc_deregister(&temp_miscdev);
 735         unregister_reboot_notifier(&wdtpci_notifier);
 736         free_irq(irq, &wdtpci_miscdev);
 737         pci_release_region(pdev, 2);
 738         pci_disable_device(pdev);
 739         dev_count--;
 740 }
 741
 742
 743 static struct pci_device_id wdtpci_pci_tbl[] = {
 744         {
 745                 .vendor    = PCI_VENDOR_ID_ACCESSIO,
 746                 .device    = PCI_DEVICE_ID_WDG_CSM,
 747                 .subvendor = PCI_ANY_ID,
 748                 .subdevice = PCI_ANY_ID,
 749         },
 750         { 0, }, /* terminate list */
 751 };
 752 MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl);
 753
 754
 755 static struct pci_driver wdtpci_driver = {
 756         .name           = "wdt_pci",
 757         .id_table       = wdtpci_pci_tbl,
 758         .probe          = wdtpci_init_one,
 759         .remove         = __devexit_p(wdtpci_remove_one),
 760 };
 761
 762
 763 /**
 764  *      wdtpci_cleanup:
 765  *
 766  *      Unload the watchdog. You cannot do this with any file handles open.
 767  *      If your watchdog is set to continue ticking on close and you unload
 768  *      it, well it keeps ticking. We won't get the interrupt but the board
 769  *      will not touch PC memory so all is fine. You just have to load a new
 770  *      module in xx seconds or reboot.
 771  */
 772
 773 static void __exit wdtpci_cleanup(void)
 774 {
 775         pci_unregister_driver(&wdtpci_driver);
 776 }
 777
 778
 779 /**
 780  *      wdtpci_init:
 781  *
 782  *      Set up the WDT watchdog board. All we have to do is grab the
 783  *      resources we require and bitch if anyone beat us to them.
 784  *      The open() function will actually kick the board off.
 785  */
 786
 787 static int __init wdtpci_init(void)
 788 {
 789         return pci_register_driver(&wdtpci_driver);
 790 }
 791
 792
 793 module_init(wdtpci_init);
 794 module_exit(wdtpci_cleanup);
 795
 796 MODULE_AUTHOR("JP Nollmann, Alan Cox");
 797 MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards");
 798 MODULE_LICENSE("GPL");
 799 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 800 MODULE_ALIAS_MISCDEV(TEMP_MINOR);