drivers/watchdog/wdt_pci.c

   1 /*
   2  *      Industrial Computer Source PCI-WDT500/501 driver
   3  *
   4  *      (c) Copyright 1996-1997 Alan Cox <alan@redhat.com>, All Rights Reserved.
   5  *                              http://www.redhat.com
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  *
  12  *      Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
  13  *      warranty for any of this software. This material is provided
  14  *      "AS-IS" and at no charge.
  15  *
  16  *      (c) Copyright 1995    Alan Cox <alan@lxorguk.ukuu.org.uk>
  17  *
  18  *      Release 0.10.
  19  *
  20  *      Fixes
  21  *              Dave Gregorich  :       Modularisation and minor bugs
  22  *              Alan Cox        :       Added the watchdog ioctl() stuff
  23  *              Alan Cox        :       Fixed the reboot problem (as noted by
  24  *                                      Matt Crocker).
  25  *              Alan Cox        :       Added wdt= boot option
  26  *              Alan Cox        :       Cleaned up copy/user stuff
  27  *              Tim Hockin      :       Added insmod parameters, comment cleanup
  28  *                                      Parameterized timeout
  29  *              JP Nollmann     :       Added support for PCI wdt501p
  30  *              Alan Cox        :       Split ISA and PCI cards into two drivers
  31  *              Jeff Garzik     :       PCI cleanups
  32  *              Tigran Aivazian :       Restructured wdtpci_init_one() to handle
  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 int 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 #ifdef CONFIG_WDT_501_PCI
 103 /* Support for the Fan Tachometer on the PCI-WDT501 */
 104 static int tachometer;
 105
 106 module_param(tachometer, int, 0);
 107 MODULE_PARM_DESC(tachometer,
 108         "PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
 109 #endif /* CONFIG_WDT_501_PCI */
 110
 111 /*
 112  *      Programming support
 113  */
 114
 115 static void wdtpci_ctr_mode(int ctr, int mode)
 116 {
 117         ctr <<= 6;
 118         ctr |= 0x30;
 119         ctr |= (mode << 1);
 120         outb(ctr, WDT_CR);
 121         udelay(8);
 122 }
 123
 124 static void wdtpci_ctr_load(int ctr, int val)
 125 {
 126         outb(val & 0xFF, WDT_COUNT0 + ctr);
 127         udelay(8);
 128         outb(val >> 8, WDT_COUNT0 + ctr);
 129         udelay(8);
 130 }
 131
 132 /**
 133  *      wdtpci_start:
 134  *
 135  *      Start the watchdog driver.
 136  */
 137
 138 static int wdtpci_start(void)
 139 {
 140         unsigned long flags;
 141
 142         spin_lock_irqsave(&wdtpci_lock, flags);
 143
 144         /*
 145          * "pet" the watchdog, as Access says.
 146          * This resets the clock outputs.
 147          */
 148         inb(WDT_DC);                    /* Disable watchdog */
 149         udelay(8);
 150         wdtpci_ctr_mode(2, 0);          /* Program CTR2 for Mode 0:
 151                                                 Pulse on Terminal Count */
 152         outb(0, WDT_DC);                /* Enable watchdog */
 153         udelay(8);
 154         inb(WDT_DC);                    /* Disable watchdog */
 155         udelay(8);
 156         outb(0, WDT_CLOCK);             /* 2.0833MHz clock */
 157         udelay(8);
 158         inb(WDT_BUZZER);                /* disable */
 159         udelay(8);
 160         inb(WDT_OPTONOTRST);            /* disable */
 161         udelay(8);
 162         inb(WDT_OPTORST);               /* disable */
 163         udelay(8);
 164         inb(WDT_PROGOUT);               /* disable */
 165         udelay(8);
 166         wdtpci_ctr_mode(0, 3);          /* Program CTR0 for Mode 3:
 167                                                 Square Wave Generator */
 168         wdtpci_ctr_mode(1, 2);          /* Program CTR1 for Mode 2:
 169                                                 Rate Generator */
 170         wdtpci_ctr_mode(2, 1);          /* Program CTR2 for Mode 1:
 171                                                 Retriggerable One-Shot */
 172         wdtpci_ctr_load(0, 20833);      /* count at 100Hz */
 173         wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
 174         /* DO NOT LOAD CTR2 on PCI card! -- JPN */
 175         outb(0, WDT_DC);                /* Enable watchdog */
 176         udelay(8);
 177
 178         spin_unlock_irqrestore(&wdtpci_lock, flags);
 179         return 0;
 180 }
 181
 182 /**
 183  *      wdtpci_stop:
 184  *
 185  *      Stop the watchdog driver.
 186  */
 187
 188 static int wdtpci_stop(void)
 189 {
 190         unsigned long flags;
 191
 192         /* Turn the card off */
 193         spin_lock_irqsave(&wdtpci_lock, flags);
 194         inb(WDT_DC);                    /* Disable watchdog */
 195         udelay(8);
 196         wdtpci_ctr_load(2, 0);          /* 0 length reset pulses now */
 197         spin_unlock_irqrestore(&wdtpci_lock, flags);
 198         return 0;
 199 }
 200
 201 /**
 202  *      wdtpci_ping:
 203  *
 204  *      Reload counter one with the watchdog heartbeat. We don't bother
 205  *      reloading the cascade counter.
 206  */
 207
 208 static int wdtpci_ping(void)
 209 {
 210         unsigned long flags;
 211
 212         spin_lock_irqsave(&wdtpci_lock, flags);
 213         /* Write a watchdog value */
 214         inb(WDT_DC);                    /* Disable watchdog */
 215         udelay(8);
 216         wdtpci_ctr_mode(1, 2);          /* Re-Program CTR1 for Mode 2:
 217                                                         Rate Generator */
 218         wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
 219         outb(0, WDT_DC);                /* Enable watchdog */
 220         udelay(8);
 221         spin_unlock_irqrestore(&wdtpci_lock, flags);
 222         return 0;
 223 }
 224
 225 /**
 226  *      wdtpci_set_heartbeat:
 227  *      @t:             the new heartbeat value that needs to be set.
 228  *
 229  *      Set a new heartbeat value for the watchdog device. If the heartbeat
 230  *      value is incorrect we keep the old value and return -EINVAL.
 231  *      If successful we return 0.
 232  */
 233 static int wdtpci_set_heartbeat(int t)
 234 {
 235         /* Arbitrary, can't find the card's limits */
 236         if (t < 1 || t > 65535)
 237                 return -EINVAL;
 238
 239         heartbeat = t;
 240         wd_heartbeat = t * 100;
 241         return 0;
 242 }
 243
 244 /**
 245  *      wdtpci_get_status:
 246  *      @status:                the new status.
 247  *
 248  *      Extract the status information from a WDT watchdog device. There are
 249  *      several board variants so we have to know which bits are valid. Some
 250  *      bits default to one and some to zero in order to be maximally painful.
 251  *
 252  *      we then map the bits onto the status ioctl flags.
 253  */
 254
 255 static int wdtpci_get_status(int *status)
 256 {
 257         unsigned char new_status;
 258         unsigned long flags;
 259
 260         spin_lock_irqsave(&wdtpci_lock, flags);
 261         new_status = inb(WDT_SR);
 262         spin_unlock_irqrestore(&wdtpci_lock, flags);
 263
 264         *status = 0;
 265         if (new_status & WDC_SR_ISOI0)
 266                 *status |= WDIOF_EXTERN1;
 267         if (new_status & WDC_SR_ISII1)
 268                 *status |= WDIOF_EXTERN2;
 269 #ifdef CONFIG_WDT_501_PCI
 270         if (!(new_status & WDC_SR_TGOOD))
 271                 *status |= WDIOF_OVERHEAT;
 272         if (!(new_status & WDC_SR_PSUOVER))
 273                 *status |= WDIOF_POWEROVER;
 274         if (!(new_status & WDC_SR_PSUUNDR))
 275                 *status |= WDIOF_POWERUNDER;
 276         if (tachometer) {
 277                 if (!(new_status & WDC_SR_FANGOOD))
 278                         *status |= WDIOF_FANFAULT;
 279         }
 280 #endif /* CONFIG_WDT_501_PCI */
 281         return 0;
 282 }
 283
 284 #ifdef CONFIG_WDT_501_PCI
 285 /**
 286  *      wdtpci_get_temperature:
 287  *
 288  *      Reports the temperature in degrees Fahrenheit. The API is in
 289  *      farenheit. It was designed by an imperial measurement luddite.
 290  */
 291
 292 static int wdtpci_get_temperature(int *temperature)
 293 {
 294         unsigned short c;
 295         unsigned long flags;
 296         spin_lock_irqsave(&wdtpci_lock, flags);
 297         c = inb(WDT_RT);
 298         udelay(8);
 299         spin_unlock_irqrestore(&wdtpci_lock, flags);
 300         *temperature = (c * 11 / 15) + 7;
 301         return 0;
 302 }
 303 #endif /* CONFIG_WDT_501_PCI */
 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 #ifdef CONFIG_WDT_501_PCI
 331         if (!(status & WDC_SR_TGOOD)) {
 332                 u8 alarm = inb(WDT_RT);
 333                 printk(KERN_CRIT PFX "Overheat alarm.(%d)\n", alarm);
 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 #endif /* CONFIG_WDT_501_PCI */
 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                         expect_close = 0;
 381
 382                         for (i = 0; i != count; i++) {
 383                                 char c;
 384                                 if (get_user(c, buf + i))
 385                                         return -EFAULT;
 386                                 if (c == 'V')
 387                                         expect_close = 42;
 388                         }
 389                 }
 390                 wdtpci_ping();
 391         }
 392         return count;
 393 }
 394
 395 /**
 396  *      wdtpci_ioctl:
 397  *      @file: file handle to the device
 398  *      @cmd: watchdog command
 399  *      @arg: argument pointer
 400  *
 401  *      The watchdog API defines a common set of functions for all watchdogs
 402  *      according to their available features. We only actually usefully support
 403  *      querying capabilities and current status.
 404  */
 405
 406 static long wdtpci_ioctl(struct file *file, unsigned int cmd,
 407                                                         unsigned long arg)
 408 {
 409         int new_heartbeat;
 410         int status;
 411         void __user *argp = (void __user *)arg;
 412         int __user *p = argp;
 413
 414         static struct watchdog_info ident = {
 415                 .options =              WDIOF_SETTIMEOUT|
 416                                         WDIOF_MAGICCLOSE|
 417                                         WDIOF_KEEPALIVEPING,
 418                 .firmware_version =     1,
 419                 .identity =             "PCI-WDT500/501",
 420         };
 421
 422         /* Add options according to the card we have */
 423         ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
 424 #ifdef CONFIG_WDT_501_PCI
 425         ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER);
 426         if (tachometer)
 427                 ident.options |= WDIOF_FANFAULT;
 428 #endif /* CONFIG_WDT_501_PCI */
 429
 430         switch (cmd) {
 431         case WDIOC_GETSUPPORT:
 432                 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
 433         case WDIOC_GETSTATUS:
 434                 wdtpci_get_status(&status);
 435                 return put_user(status, p);
 436         case WDIOC_GETBOOTSTATUS:
 437                 return put_user(0, p);
 438         case WDIOC_KEEPALIVE:
 439                 wdtpci_ping();
 440                 return 0;
 441         case WDIOC_SETTIMEOUT:
 442                 if (get_user(new_heartbeat, p))
 443                         return -EFAULT;
 444                 if (wdtpci_set_heartbeat(new_heartbeat))
 445                         return -EINVAL;
 446                 wdtpci_ping();
 447                 /* Fall */
 448         case WDIOC_GETTIMEOUT:
 449                 return put_user(heartbeat, p);
 450         default:
 451                 return -ENOTTY;
 452         }
 453 }
 454
 455 /**
 456  *      wdtpci_open:
 457  *      @inode: inode of device
 458  *      @file: file handle to device
 459  *
 460  *      The watchdog device has been opened. The watchdog device is single
 461  *      open and on opening we load the counters. Counter zero is a 100Hz
 462  *      cascade, into counter 1 which downcounts to reboot. When the counter
 463  *      triggers counter 2 downcounts the length of the reset pulse which
 464  *      set set to be as long as possible.
 465  */
 466
 467 static int wdtpci_open(struct inode *inode, struct file *file)
 468 {
 469         if (test_and_set_bit(0, &open_lock))
 470                 return -EBUSY;
 471
 472         if (nowayout)
 473                 __module_get(THIS_MODULE);
 474         /*
 475          *      Activate
 476          */
 477         wdtpci_start();
 478         return nonseekable_open(inode, file);
 479 }
 480
 481 /**
 482  *      wdtpci_release:
 483  *      @inode: inode to board
 484  *      @file: file handle to board
 485  *
 486  *      The watchdog has a configurable API. There is a religious dispute
 487  *      between people who want their watchdog to be able to shut down and
 488  *      those who want to be sure if the watchdog manager dies the machine
 489  *      reboots. In the former case we disable the counters, in the latter
 490  *      case you have to open it again very soon.
 491  */
 492
 493 static int wdtpci_release(struct inode *inode, struct file *file)
 494 {
 495         if (expect_close == 42) {
 496                 wdtpci_stop();
 497         } else {
 498                 printk(KERN_CRIT PFX "Unexpected close, not stopping timer!");
 499                 wdtpci_ping();
 500         }
 501         expect_close = 0;
 502         clear_bit(0, &open_lock);
 503         return 0;
 504 }
 505
 506 #ifdef CONFIG_WDT_501_PCI
 507 /**
 508  *      wdtpci_temp_read:
 509  *      @file: file handle to the watchdog board
 510  *      @buf: buffer to write 1 byte into
 511  *      @count: length of buffer
 512  *      @ptr: offset (no seek allowed)
 513  *
 514  *      Read reports the temperature in degrees Fahrenheit. The API is in
 515  *      fahrenheit. It was designed by an imperial measurement luddite.
 516  */
 517
 518 static ssize_t wdtpci_temp_read(struct file *file, char __user *buf,
 519                                                 size_t count, loff_t *ptr)
 520 {
 521         int temperature;
 522
 523         if (wdtpci_get_temperature(&temperature))
 524                 return -EFAULT;
 525
 526         if (copy_to_user(buf, &temperature, 1))
 527                 return -EFAULT;
 528
 529         return 1;
 530 }
 531
 532 /**
 533  *      wdtpci_temp_open:
 534  *      @inode: inode of device
 535  *      @file: file handle to device
 536  *
 537  *      The temperature device has been opened.
 538  */
 539
 540 static int wdtpci_temp_open(struct inode *inode, struct file *file)
 541 {
 542         return nonseekable_open(inode, file);
 543 }
 544
 545 /**
 546  *      wdtpci_temp_release:
 547  *      @inode: inode to board
 548  *      @file: file handle to board
 549  *
 550  *      The temperature device has been closed.
 551  */
 552
 553 static int wdtpci_temp_release(struct inode *inode, struct file *file)
 554 {
 555         return 0;
 556 }
 557 #endif /* CONFIG_WDT_501_PCI */
 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 #ifdef CONFIG_WDT_501_PCI
 600 static const struct file_operations wdtpci_temp_fops = {
 601         .owner          = THIS_MODULE,
 602         .llseek         = no_llseek,
 603         .read           = wdtpci_temp_read,
 604         .open           = wdtpci_temp_open,
 605         .release        = wdtpci_temp_release,
 606 };
 607
 608 static struct miscdevice temp_miscdev = {
 609         .minor  = TEMP_MINOR,
 610         .name   = "temperature",
 611         .fops   = &wdtpci_temp_fops,
 612 };
 613 #endif /* CONFIG_WDT_501_PCI */
 614
 615 /*
 616  *      The WDT card needs to learn about soft shutdowns in order to
 617  *      turn the timebomb registers off.
 618  */
 619
 620 static struct notifier_block wdtpci_notifier = {
 621         .notifier_call = wdtpci_notify_sys,
 622 };
 623
 624
 625 static int __devinit wdtpci_init_one(struct pci_dev *dev,
 626                                         const struct pci_device_id *ent)
 627 {
 628         int ret = -EIO;
 629
 630         dev_count++;
 631         if (dev_count > 1) {
 632                 printk(KERN_ERR PFX "This driver only supports one device\n");
 633                 return -ENODEV;
 634         }
 635
 636         if (pci_enable_device(dev)) {
 637                 printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
 638                 return -ENODEV;
 639         }
 640
 641         if (pci_resource_start(dev, 2) == 0x0000) {
 642                 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
 643                 ret = -ENODEV;
 644                 goto out_pci;
 645         }
 646
 647         irq = dev->irq;
 648         io = pci_resource_start(dev, 2);
 649
 650         if (request_region(io, 16, "wdt_pci") == NULL) {
 651                 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", io);
 652                 goto out_pci;
 653         }
 654
 655         if (request_irq(irq, wdtpci_interrupt, IRQF_DISABLED | IRQF_SHARED,
 656                          "wdt_pci", &wdtpci_miscdev)) {
 657                 printk(KERN_ERR PFX "IRQ %d is not free\n", irq);
 658                 goto out_reg;
 659         }
 660
 661         printk(KERN_INFO
 662          "PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%04x (Interrupt %d)\n",
 663                                                                 io, irq);
 664
 665         /* Check that the heartbeat value is within its range;
 666            if not reset to the default */
 667         if (wdtpci_set_heartbeat(heartbeat)) {
 668                 wdtpci_set_heartbeat(WD_TIMO);
 669                 printk(KERN_INFO PFX
 670                   "heartbeat value must be 0 < heartbeat < 65536, using %d\n",
 671                                                                 WD_TIMO);
 672         }
 673
 674         ret = register_reboot_notifier(&wdtpci_notifier);
 675         if (ret) {
 676                 printk(KERN_ERR PFX
 677                         "cannot register reboot notifier (err=%d)\n", ret);
 678                 goto out_irq;
 679         }
 680
 681 #ifdef CONFIG_WDT_501_PCI
 682         ret = misc_register(&temp_miscdev);
 683         if (ret) {
 684                 printk(KERN_ERR PFX
 685                         "cannot register miscdev on minor=%d (err=%d)\n",
 686                                         TEMP_MINOR, ret);
 687                 goto out_rbt;
 688         }
 689 #endif /* CONFIG_WDT_501_PCI */
 690
 691         ret = misc_register(&wdtpci_miscdev);
 692         if (ret) {
 693                 printk(KERN_ERR PFX
 694                         "cannot register miscdev on minor=%d (err=%d)\n",
 695                                                 WATCHDOG_MINOR, ret);
 696                 goto out_misc;
 697         }
 698
 699         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 700                 heartbeat, nowayout);
 701 #ifdef CONFIG_WDT_501_PCI
 702         printk(KERN_INFO "wdt: Fan Tachometer is %s\n",
 703                                 (tachometer ? "Enabled" : "Disabled"));
 704 #endif /* CONFIG_WDT_501_PCI */
 705
 706         ret = 0;
 707 out:
 708         return ret;
 709
 710 out_misc:
 711 #ifdef CONFIG_WDT_501_PCI
 712         misc_deregister(&temp_miscdev);
 713 out_rbt:
 714 #endif /* CONFIG_WDT_501_PCI */
 715         unregister_reboot_notifier(&wdtpci_notifier);
 716 out_irq:
 717         free_irq(irq, &wdtpci_miscdev);
 718 out_reg:
 719         release_region(io, 16);
 720 out_pci:
 721         pci_disable_device(dev);
 722         goto out;
 723 }
 724
 725
 726 static void __devexit wdtpci_remove_one(struct pci_dev *pdev)
 727 {
 728         /* here we assume only one device will ever have
 729          * been picked up and registered by probe function */
 730         misc_deregister(&wdtpci_miscdev);
 731 #ifdef CONFIG_WDT_501_PCI
 732         misc_deregister(&temp_miscdev);
 733 #endif /* CONFIG_WDT_501_PCI */
 734         unregister_reboot_notifier(&wdtpci_notifier);
 735         free_irq(irq, &wdtpci_miscdev);
 736         release_region(io, 16);
 737         pci_disable_device(pdev);
 738         dev_count--;
 739 }
 740
 741
 742 static struct pci_device_id wdtpci_pci_tbl[] = {
 743         {
 744                 .vendor    = PCI_VENDOR_ID_ACCESSIO,
 745                 .device    = PCI_DEVICE_ID_WDG_CSM,
 746                 .subvendor = PCI_ANY_ID,
 747                 .subdevice = PCI_ANY_ID,
 748         },
 749         { 0, }, /* terminate list */
 750 };
 751 MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl);
 752
 753
 754 static struct pci_driver wdtpci_driver = {
 755         .name           = "wdt_pci",
 756         .id_table       = wdtpci_pci_tbl,
 757         .probe          = wdtpci_init_one,
 758         .remove         = __devexit_p(wdtpci_remove_one),
 759 };
 760
 761
 762 /**
 763  *      wdtpci_cleanup:
 764  *
 765  *      Unload the watchdog. You cannot do this with any file handles open.
 766  *      If your watchdog is set to continue ticking on close and you unload
 767  *      it, well it keeps ticking. We won't get the interrupt but the board
 768  *      will not touch PC memory so all is fine. You just have to load a new
 769  *      module in xx seconds or reboot.
 770  */
 771
 772 static void __exit wdtpci_cleanup(void)
 773 {
 774         pci_unregister_driver(&wdtpci_driver);
 775 }
 776
 777
 778 /**
 779  *      wdtpci_init:
 780  *
 781  *      Set up the WDT watchdog board. All we have to do is grab the
 782  *      resources we require and bitch if anyone beat us to them.
 783  *      The open() function will actually kick the board off.
 784  */
 785
 786 static int __init wdtpci_init(void)
 787 {
 788         return pci_register_driver(&wdtpci_driver);
 789 }
 790
 791
 792 module_init(wdtpci_init);
 793 module_exit(wdtpci_cleanup);
 794
 795 MODULE_AUTHOR("JP Nollmann, Alan Cox");
 796 MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards");
 797 MODULE_LICENSE("GPL");
 798 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 799 MODULE_ALIAS_MISCDEV(TEMP_MINOR);