1 /*************************************************************************** 2 * Copyright (C) 2006 by Hans Edgington <hans@edgington.nl> * 3 * Copyright (C) 2007-2009 Hans de Goede <hdegoede@redhat.com> * 4 * Copyright (C) 2010 Giel van Schijndel <me@mortis.eu> * 5 * * 6 * This program is free software; you can redistribute it and/or modify * 7 * it under the terms of the GNU General Public License as published by * 8 * the Free Software Foundation; either version 2 of the License, or * 9 * (at your option) any later version. * 10 * * 11 * This program is distributed in the hope that it will be useful, * 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of * 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * 14 * GNU General Public License for more details. * 15 * * 16 * You should have received a copy of the GNU General Public License * 17 * along with this program; if not, write to the * 18 * Free Software Foundation, Inc., * 19 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * 20 ***************************************************************************/ 21 22 #include <linux/err.h> 23 #include <linux/fs.h> 24 #include <linux/init.h> 25 #include <linux/io.h> 26 #include <linux/ioport.h> 27 #include <linux/miscdevice.h> 28 #include <linux/module.h> 29 #include <linux/mutex.h> 30 #include <linux/notifier.h> 31 #include <linux/reboot.h> 32 #include <linux/uaccess.h> 33 #include <linux/watchdog.h> 34 35 #define DRVNAME "f71808e_wdt" 36 37 #define SIO_F71808FG_LD_WDT 0x07 /* Watchdog timer logical device */ 38 #define SIO_UNLOCK_KEY 0x87 /* Key to enable Super-I/O */ 39 #define SIO_LOCK_KEY 0xAA /* Key to diasble Super-I/O */ 40 41 #define SIO_REG_LDSEL 0x07 /* Logical device select */ 42 #define SIO_REG_DEVID 0x20 /* Device ID (2 bytes) */ 43 #define SIO_REG_DEVREV 0x22 /* Device revision */ 44 #define SIO_REG_MANID 0x23 /* Fintek ID (2 bytes) */ 45 #define SIO_REG_ENABLE 0x30 /* Logical device enable */ 46 #define SIO_REG_ADDR 0x60 /* Logical device address (2 bytes) */ 47 48 #define SIO_FINTEK_ID 0x1934 /* Manufacturers ID */ 49 #define SIO_F71808_ID 0x0901 /* Chipset ID */ 50 #define SIO_F71858_ID 0x0507 /* Chipset ID */ 51 #define SIO_F71862_ID 0x0601 /* Chipset ID */ 52 #define SIO_F71882_ID 0x0541 /* Chipset ID */ 53 #define SIO_F71889_ID 0x0723 /* Chipset ID */ 54 55 #define F71882FG_REG_START 0x01 56 57 #define F71808FG_REG_WDO_CONF 0xf0 58 #define F71808FG_REG_WDT_CONF 0xf5 59 #define F71808FG_REG_WD_TIME 0xf6 60 61 #define F71808FG_FLAG_WDOUT_EN 7 62 63 #define F71808FG_FLAG_WDTMOUT_STS 5 64 #define F71808FG_FLAG_WD_EN 5 65 #define F71808FG_FLAG_WD_PULSE 4 66 #define F71808FG_FLAG_WD_UNIT 3 67 68 /* Default values */ 69 #define WATCHDOG_TIMEOUT 60 /* 1 minute default timeout */ 70 #define WATCHDOG_MAX_TIMEOUT (60 * 255) 71 #define WATCHDOG_PULSE_WIDTH 125 /* 125 ms, default pulse width for 72 watchdog signal */ 73 74 static unsigned short force_id; 75 module_param(force_id, ushort, 0); 76 MODULE_PARM_DESC(force_id, "Override the detected device ID"); 77 78 static const int max_timeout = WATCHDOG_MAX_TIMEOUT; 79 static int timeout = 60; /* default timeout in seconds */ 80 module_param(timeout, int, 0); 81 MODULE_PARM_DESC(timeout, 82 "Watchdog timeout in seconds. 1<= timeout <=" 83 __MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default=" 84 __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); 85 86 static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH; 87 module_param(pulse_width, uint, 0); 88 MODULE_PARM_DESC(pulse_width, 89 "Watchdog signal pulse width. 0(=level), 1 ms, 25 ms, 125 ms or 5000 ms" 90 " (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")"); 91 92 static int nowayout = WATCHDOG_NOWAYOUT; 93 module_param(nowayout, bool, 0444); 94 MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close"); 95 96 static unsigned int start_withtimeout; 97 module_param(start_withtimeout, uint, 0); 98 MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with" 99 " given initial timeout. Zero (default) disables this feature."); 100 101 enum chips { f71808fg, f71858fg, f71862fg, f71882fg, f71889fg }; 102 103 static const char *f71808e_names[] = { 104 "f71808fg", 105 "f71858fg", 106 "f71862fg", 107 "f71882fg", 108 "f71889fg", 109 }; 110 111 /* Super-I/O Function prototypes */ 112 static inline int superio_inb(int base, int reg); 113 static inline int superio_inw(int base, int reg); 114 static inline void superio_outb(int base, int reg, u8 val); 115 static inline void superio_set_bit(int base, int reg, int bit); 116 static inline void superio_clear_bit(int base, int reg, int bit); 117 static inline int superio_enter(int base); 118 static inline void superio_select(int base, int ld); 119 static inline void superio_exit(int base); 120 121 struct watchdog_data { 122 unsigned short sioaddr; 123 enum chips type; 124 unsigned long opened; 125 struct mutex lock; 126 char expect_close; 127 struct watchdog_info ident; 128 129 unsigned short timeout; 130 u8 timer_val; /* content for the wd_time register */ 131 char minutes_mode; 132 u8 pulse_val; /* pulse width flag */ 133 char pulse_mode; /* enable pulse output mode? */ 134 char caused_reboot; /* last reboot was by the watchdog */ 135 }; 136 137 static struct watchdog_data watchdog = { 138 .lock = __MUTEX_INITIALIZER(watchdog.lock), 139 }; 140 141 /* Super I/O functions */ 142 static inline int superio_inb(int base, int reg) 143 { 144 outb(reg, base); 145 return inb(base + 1); 146 } 147 148 static int superio_inw(int base, int reg) 149 { 150 int val; 151 val = superio_inb(base, reg) << 8; 152 val |= superio_inb(base, reg + 1); 153 return val; 154 } 155 156 static inline void superio_outb(int base, int reg, u8 val) 157 { 158 outb(reg, base); 159 outb(val, base + 1); 160 } 161 162 static inline void superio_set_bit(int base, int reg, int bit) 163 { 164 unsigned long val = superio_inb(base, reg); 165 __set_bit(bit, &val); 166 superio_outb(base, reg, val); 167 } 168 169 static inline void superio_clear_bit(int base, int reg, int bit) 170 { 171 unsigned long val = superio_inb(base, reg); 172 __clear_bit(bit, &val); 173 superio_outb(base, reg, val); 174 } 175 176 static inline int superio_enter(int base) 177 { 178 /* Don't step on other drivers' I/O space by accident */ 179 if (!request_muxed_region(base, 2, DRVNAME)) { 180 printk(KERN_ERR DRVNAME ": I/O address 0x%04x already in use\n", 181 (int)base); 182 return -EBUSY; 183 } 184 185 /* according to the datasheet the key must be send twice! */ 186 outb(SIO_UNLOCK_KEY, base); 187 outb(SIO_UNLOCK_KEY, base); 188 189 return 0; 190 } 191 192 static inline void superio_select(int base, int ld) 193 { 194 outb(SIO_REG_LDSEL, base); 195 outb(ld, base + 1); 196 } 197 198 static inline void superio_exit(int base) 199 { 200 outb(SIO_LOCK_KEY, base); 201 release_region(base, 2); 202 } 203 204 static int watchdog_set_timeout(int timeout) 205 { 206 if (timeout <= 0 207 || timeout > max_timeout) { 208 printk(KERN_ERR DRVNAME ": watchdog timeout out of range\n"); 209 return -EINVAL; 210 } 211 212 mutex_lock(&watchdog.lock); 213 214 watchdog.timeout = timeout; 215 if (timeout > 0xff) { 216 watchdog.timer_val = DIV_ROUND_UP(timeout, 60); 217 watchdog.minutes_mode = true; 218 } else { 219 watchdog.timer_val = timeout; 220 watchdog.minutes_mode = false; 221 } 222 223 mutex_unlock(&watchdog.lock); 224 225 return 0; 226 } 227 228 static int watchdog_set_pulse_width(unsigned int pw) 229 { 230 int err = 0; 231 232 mutex_lock(&watchdog.lock); 233 234 if (pw <= 1) { 235 watchdog.pulse_val = 0; 236 } else if (pw <= 25) { 237 watchdog.pulse_val = 1; 238 } else if (pw <= 125) { 239 watchdog.pulse_val = 2; 240 } else if (pw <= 5000) { 241 watchdog.pulse_val = 3; 242 } else { 243 printk(KERN_ERR DRVNAME ": pulse width out of range\n"); 244 err = -EINVAL; 245 goto exit_unlock; 246 } 247 248 watchdog.pulse_mode = pw; 249 250 exit_unlock: 251 mutex_unlock(&watchdog.lock); 252 return err; 253 } 254 255 static int watchdog_keepalive(void) 256 { 257 int err = 0; 258 259 mutex_lock(&watchdog.lock); 260 err = superio_enter(watchdog.sioaddr); 261 if (err) 262 goto exit_unlock; 263 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); 264 265 if (watchdog.minutes_mode) 266 /* select minutes for timer units */ 267 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF, 268 F71808FG_FLAG_WD_UNIT); 269 else 270 /* select seconds for timer units */ 271 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF, 272 F71808FG_FLAG_WD_UNIT); 273 274 /* Set timer value */ 275 superio_outb(watchdog.sioaddr, F71808FG_REG_WD_TIME, 276 watchdog.timer_val); 277 278 superio_exit(watchdog.sioaddr); 279 280 exit_unlock: 281 mutex_unlock(&watchdog.lock); 282 return err; 283 } 284 285 static int watchdog_start(void) 286 { 287 /* Make sure we don't die as soon as the watchdog is enabled below */ 288 int err = watchdog_keepalive(); 289 if (err) 290 return err; 291 292 mutex_lock(&watchdog.lock); 293 err = superio_enter(watchdog.sioaddr); 294 if (err) 295 goto exit_unlock; 296 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); 297 298 /* Watchdog pin configuration */ 299 switch (watchdog.type) { 300 case f71808fg: 301 /* Set pin 21 to GPIO23/WDTRST#, then to WDTRST# */ 302 superio_clear_bit(watchdog.sioaddr, 0x2a, 3); 303 superio_clear_bit(watchdog.sioaddr, 0x2b, 3); 304 break; 305 306 case f71882fg: 307 /* Set pin 56 to WDTRST# */ 308 superio_set_bit(watchdog.sioaddr, 0x29, 1); 309 break; 310 311 case f71889fg: 312 /* set pin 40 to WDTRST# */ 313 superio_outb(watchdog.sioaddr, 0x2b, 314 superio_inb(watchdog.sioaddr, 0x2b) & 0xcf); 315 break; 316 317 default: 318 /* 319 * 'default' label to shut up the compiler and catch 320 * programmer errors 321 */ 322 err = -ENODEV; 323 goto exit_superio; 324 } 325 326 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); 327 superio_set_bit(watchdog.sioaddr, SIO_REG_ENABLE, 0); 328 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDO_CONF, 329 F71808FG_FLAG_WDOUT_EN); 330 331 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF, 332 F71808FG_FLAG_WD_EN); 333 334 if (watchdog.pulse_mode) { 335 /* Select "pulse" output mode with given duration */ 336 u8 wdt_conf = superio_inb(watchdog.sioaddr, 337 F71808FG_REG_WDT_CONF); 338 339 /* Set WD_PSWIDTH bits (1:0) */ 340 wdt_conf = (wdt_conf & 0xfc) | (watchdog.pulse_val & 0x03); 341 /* Set WD_PULSE to "pulse" mode */ 342 wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE); 343 344 superio_outb(watchdog.sioaddr, F71808FG_REG_WDT_CONF, 345 wdt_conf); 346 } else { 347 /* Select "level" output mode */ 348 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF, 349 F71808FG_FLAG_WD_PULSE); 350 } 351 352 exit_superio: 353 superio_exit(watchdog.sioaddr); 354 exit_unlock: 355 mutex_unlock(&watchdog.lock); 356 357 return err; 358 } 359 360 static int watchdog_stop(void) 361 { 362 int err = 0; 363 364 mutex_lock(&watchdog.lock); 365 err = superio_enter(watchdog.sioaddr); 366 if (err) 367 goto exit_unlock; 368 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); 369 370 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF, 371 F71808FG_FLAG_WD_EN); 372 373 superio_exit(watchdog.sioaddr); 374 375 exit_unlock: 376 mutex_unlock(&watchdog.lock); 377 378 return err; 379 } 380 381 static int watchdog_get_status(void) 382 { 383 int status = 0; 384 385 mutex_lock(&watchdog.lock); 386 status = (watchdog.caused_reboot) ? WDIOF_CARDRESET : 0; 387 mutex_unlock(&watchdog.lock); 388 389 return status; 390 } 391 392 static bool watchdog_is_running(void) 393 { 394 /* 395 * if we fail to determine the watchdog's status assume it to be 396 * running to be on the safe side 397 */ 398 bool is_running = true; 399 400 mutex_lock(&watchdog.lock); 401 if (superio_enter(watchdog.sioaddr)) 402 goto exit_unlock; 403 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); 404 405 is_running = (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0)) 406 && (superio_inb(watchdog.sioaddr, F71808FG_REG_WDT_CONF) 407 & F71808FG_FLAG_WD_EN); 408 409 superio_exit(watchdog.sioaddr); 410 411 exit_unlock: 412 mutex_unlock(&watchdog.lock); 413 return is_running; 414 } 415 416 /* /dev/watchdog api */ 417 418 static int watchdog_open(struct inode *inode, struct file *file) 419 { 420 int err; 421 422 /* If the watchdog is alive we don't need to start it again */ 423 if (test_and_set_bit(0, &watchdog.opened)) 424 return -EBUSY; 425 426 err = watchdog_start(); 427 if (err) { 428 clear_bit(0, &watchdog.opened); 429 return err; 430 } 431 432 if (nowayout) 433 __module_get(THIS_MODULE); 434 435 watchdog.expect_close = 0; 436 return nonseekable_open(inode, file); 437 } 438 439 static int watchdog_release(struct inode *inode, struct file *file) 440 { 441 clear_bit(0, &watchdog.opened); 442 443 if (!watchdog.expect_close) { 444 watchdog_keepalive(); 445 printk(KERN_CRIT DRVNAME 446 ": Unexpected close, not stopping watchdog!\n"); 447 } else if (!nowayout) { 448 watchdog_stop(); 449 } 450 return 0; 451 } 452 453 /* 454 * watchdog_write: 455 * @file: file handle to the watchdog 456 * @buf: buffer to write 457 * @count: count of bytes 458 * @ppos: pointer to the position to write. No seeks allowed 459 * 460 * A write to a watchdog device is defined as a keepalive signal. Any 461 * write of data will do, as we we don't define content meaning. 462 */ 463 464 static ssize_t watchdog_write(struct file *file, const char __user *buf, 465 size_t count, loff_t *ppos) 466 { 467 if (count) { 468 if (!nowayout) { 469 size_t i; 470 471 /* In case it was set long ago */ 472 bool expect_close = false; 473 474 for (i = 0; i != count; i++) { 475 char c; 476 if (get_user(c, buf + i)) 477 return -EFAULT; 478 expect_close = (c == 'V'); 479 } 480 481 /* Properly order writes across fork()ed processes */ 482 mutex_lock(&watchdog.lock); 483 watchdog.expect_close = expect_close; 484 mutex_unlock(&watchdog.lock); 485 } 486 487 /* someone wrote to us, we should restart timer */ 488 watchdog_keepalive(); 489 } 490 return count; 491 } 492 493 /* 494 * watchdog_ioctl: 495 * @inode: inode of the device 496 * @file: file handle to the device 497 * @cmd: watchdog command 498 * @arg: argument pointer 499 * 500 * The watchdog API defines a common set of functions for all watchdogs 501 * according to their available features. 502 */ 503 static long watchdog_ioctl(struct file *file, unsigned int cmd, 504 unsigned long arg) 505 { 506 int status; 507 int new_options; 508 int new_timeout; 509 union { 510 struct watchdog_info __user *ident; 511 int __user *i; 512 } uarg; 513 514 uarg.i = (int __user *)arg; 515 516 switch (cmd) { 517 case WDIOC_GETSUPPORT: 518 return copy_to_user(uarg.ident, &watchdog.ident, 519 sizeof(watchdog.ident)) ? -EFAULT : 0; 520 521 case WDIOC_GETSTATUS: 522 status = watchdog_get_status(); 523 if (status < 0) 524 return status; 525 return put_user(status, uarg.i); 526 527 case WDIOC_GETBOOTSTATUS: 528 return put_user(0, uarg.i); 529 530 case WDIOC_SETOPTIONS: 531 if (get_user(new_options, uarg.i)) 532 return -EFAULT; 533 534 if (new_options & WDIOS_DISABLECARD) 535 watchdog_stop(); 536 537 if (new_options & WDIOS_ENABLECARD) 538 return watchdog_start(); 539 540 541 case WDIOC_KEEPALIVE: 542 watchdog_keepalive(); 543 return 0; 544 545 case WDIOC_SETTIMEOUT: 546 if (get_user(new_timeout, uarg.i)) 547 return -EFAULT; 548 549 if (watchdog_set_timeout(new_timeout)) 550 return -EINVAL; 551 552 watchdog_keepalive(); 553 /* Fall */ 554 555 case WDIOC_GETTIMEOUT: 556 return put_user(watchdog.timeout, uarg.i); 557 558 default: 559 return -ENOTTY; 560 561 } 562 } 563 564 static int watchdog_notify_sys(struct notifier_block *this, unsigned long code, 565 void *unused) 566 { 567 if (code == SYS_DOWN || code == SYS_HALT) 568 watchdog_stop(); 569 return NOTIFY_DONE; 570 } 571 572 static const struct file_operations watchdog_fops = { 573 .owner = THIS_MODULE, 574 .llseek = no_llseek, 575 .open = watchdog_open, 576 .release = watchdog_release, 577 .write = watchdog_write, 578 .unlocked_ioctl = watchdog_ioctl, 579 }; 580 581 static struct miscdevice watchdog_miscdev = { 582 .minor = WATCHDOG_MINOR, 583 .name = "watchdog", 584 .fops = &watchdog_fops, 585 }; 586 587 static struct notifier_block watchdog_notifier = { 588 .notifier_call = watchdog_notify_sys, 589 }; 590 591 static int __init watchdog_init(int sioaddr) 592 { 593 int wdt_conf, err = 0; 594 595 /* No need to lock watchdog.lock here because no entry points 596 * into the module have been registered yet. 597 */ 598 watchdog.sioaddr = sioaddr; 599 watchdog.ident.options = WDIOC_SETTIMEOUT 600 | WDIOF_MAGICCLOSE 601 | WDIOF_KEEPALIVEPING; 602 603 snprintf(watchdog.ident.identity, 604 sizeof(watchdog.ident.identity), "%s watchdog", 605 f71808e_names[watchdog.type]); 606 607 err = superio_enter(sioaddr); 608 if (err) 609 return err; 610 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); 611 612 wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF); 613 watchdog.caused_reboot = wdt_conf & F71808FG_FLAG_WDTMOUT_STS; 614 615 superio_exit(sioaddr); 616 617 err = watchdog_set_timeout(timeout); 618 if (err) 619 return err; 620 err = watchdog_set_pulse_width(pulse_width); 621 if (err) 622 return err; 623 624 err = register_reboot_notifier(&watchdog_notifier); 625 if (err) 626 return err; 627 628 err = misc_register(&watchdog_miscdev); 629 if (err) { 630 printk(KERN_ERR DRVNAME 631 ": cannot register miscdev on minor=%d\n", 632 watchdog_miscdev.minor); 633 goto exit_reboot; 634 } 635 636 if (start_withtimeout) { 637 if (start_withtimeout <= 0 638 || start_withtimeout > max_timeout) { 639 printk(KERN_ERR DRVNAME 640 ": starting timeout out of range\n"); 641 err = -EINVAL; 642 goto exit_miscdev; 643 } 644 645 err = watchdog_start(); 646 if (err) { 647 printk(KERN_ERR DRVNAME 648 ": cannot start watchdog timer\n"); 649 goto exit_miscdev; 650 } 651 652 mutex_lock(&watchdog.lock); 653 err = superio_enter(sioaddr); 654 if (err) 655 goto exit_unlock; 656 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); 657 658 if (start_withtimeout > 0xff) { 659 /* select minutes for timer units */ 660 superio_set_bit(sioaddr, F71808FG_REG_WDT_CONF, 661 F71808FG_FLAG_WD_UNIT); 662 superio_outb(sioaddr, F71808FG_REG_WD_TIME, 663 DIV_ROUND_UP(start_withtimeout, 60)); 664 } else { 665 /* select seconds for timer units */ 666 superio_clear_bit(sioaddr, F71808FG_REG_WDT_CONF, 667 F71808FG_FLAG_WD_UNIT); 668 superio_outb(sioaddr, F71808FG_REG_WD_TIME, 669 start_withtimeout); 670 } 671 672 superio_exit(sioaddr); 673 mutex_unlock(&watchdog.lock); 674 675 if (nowayout) 676 __module_get(THIS_MODULE); 677 678 printk(KERN_INFO DRVNAME 679 ": watchdog started with initial timeout of %u sec\n", 680 start_withtimeout); 681 } 682 683 return 0; 684 685 exit_unlock: 686 mutex_unlock(&watchdog.lock); 687 exit_miscdev: 688 misc_deregister(&watchdog_miscdev); 689 exit_reboot: 690 unregister_reboot_notifier(&watchdog_notifier); 691 692 return err; 693 } 694 695 static int __init f71808e_find(int sioaddr) 696 { 697 u16 devid; 698 int err = superio_enter(sioaddr); 699 if (err) 700 return err; 701 702 devid = superio_inw(sioaddr, SIO_REG_MANID); 703 if (devid != SIO_FINTEK_ID) { 704 pr_debug(DRVNAME ": Not a Fintek device\n"); 705 err = -ENODEV; 706 goto exit; 707 } 708 709 devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID); 710 switch (devid) { 711 case SIO_F71808_ID: 712 watchdog.type = f71808fg; 713 break; 714 case SIO_F71882_ID: 715 watchdog.type = f71882fg; 716 break; 717 case SIO_F71889_ID: 718 watchdog.type = f71889fg; 719 break; 720 case SIO_F71862_ID: 721 /* These have a watchdog, though it isn't implemented (yet). */ 722 err = -ENOSYS; 723 goto exit; 724 case SIO_F71858_ID: 725 /* Confirmed (by datasheet) not to have a watchdog. */ 726 err = -ENODEV; 727 goto exit; 728 default: 729 printk(KERN_INFO DRVNAME ": Unrecognized Fintek device: %04x\n", 730 (unsigned int)devid); 731 err = -ENODEV; 732 goto exit; 733 } 734 735 printk(KERN_INFO DRVNAME ": Found %s watchdog chip, revision %d\n", 736 f71808e_names[watchdog.type], 737 (int)superio_inb(sioaddr, SIO_REG_DEVREV)); 738 exit: 739 superio_exit(sioaddr); 740 return err; 741 } 742 743 static int __init f71808e_init(void) 744 { 745 static const unsigned short addrs[] = { 0x2e, 0x4e }; 746 int err = -ENODEV; 747 int i; 748 749 for (i = 0; i < ARRAY_SIZE(addrs); i++) { 750 err = f71808e_find(addrs[i]); 751 if (err == 0) 752 break; 753 } 754 if (i == ARRAY_SIZE(addrs)) 755 return err; 756 757 return watchdog_init(addrs[i]); 758 } 759 760 static void __exit f71808e_exit(void) 761 { 762 if (watchdog_is_running()) { 763 printk(KERN_WARNING DRVNAME 764 ": Watchdog timer still running, stopping it\n"); 765 watchdog_stop(); 766 } 767 misc_deregister(&watchdog_miscdev); 768 unregister_reboot_notifier(&watchdog_notifier); 769 } 770 771 MODULE_DESCRIPTION("F71808E Watchdog Driver"); 772 MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>"); 773 MODULE_LICENSE("GPL"); 774 775 module_init(f71808e_init); 776 module_exit(f71808e_exit); 777