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); 800