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 static 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); 801