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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 23 24 #include <linux/err.h> 25 #include <linux/fs.h> 26 #include <linux/init.h> 27 #include <linux/io.h> 28 #include <linux/ioport.h> 29 #include <linux/miscdevice.h> 30 #include <linux/module.h> 31 #include <linux/mutex.h> 32 #include <linux/notifier.h> 33 #include <linux/reboot.h> 34 #include <linux/uaccess.h> 35 #include <linux/watchdog.h> 36 37 #define DRVNAME "f71808e_wdt" 38 39 #define SIO_F71808FG_LD_WDT 0x07 /* Watchdog timer logical device */ 40 #define SIO_UNLOCK_KEY 0x87 /* Key to enable Super-I/O */ 41 #define SIO_LOCK_KEY 0xAA /* Key to disable Super-I/O */ 42 43 #define SIO_REG_LDSEL 0x07 /* Logical device select */ 44 #define SIO_REG_DEVID 0x20 /* Device ID (2 bytes) */ 45 #define SIO_REG_DEVREV 0x22 /* Device revision */ 46 #define SIO_REG_MANID 0x23 /* Fintek ID (2 bytes) */ 47 #define SIO_REG_ROM_ADDR_SEL 0x27 /* ROM address select */ 48 #define SIO_REG_MFUNCT1 0x29 /* Multi function select 1 */ 49 #define SIO_REG_MFUNCT2 0x2a /* Multi function select 2 */ 50 #define SIO_REG_MFUNCT3 0x2b /* Multi function select 3 */ 51 #define SIO_REG_ENABLE 0x30 /* Logical device enable */ 52 #define SIO_REG_ADDR 0x60 /* Logical device address (2 bytes) */ 53 54 #define SIO_FINTEK_ID 0x1934 /* Manufacturers ID */ 55 #define SIO_F71808_ID 0x0901 /* Chipset ID */ 56 #define SIO_F71858_ID 0x0507 /* Chipset ID */ 57 #define SIO_F71862_ID 0x0601 /* Chipset ID */ 58 #define SIO_F71869_ID 0x0814 /* Chipset ID */ 59 #define SIO_F71869A_ID 0x1007 /* Chipset ID */ 60 #define SIO_F71882_ID 0x0541 /* Chipset ID */ 61 #define SIO_F71889_ID 0x0723 /* Chipset ID */ 62 #define SIO_F81865_ID 0x0704 /* Chipset ID */ 63 64 #define F71808FG_REG_WDO_CONF 0xf0 65 #define F71808FG_REG_WDT_CONF 0xf5 66 #define F71808FG_REG_WD_TIME 0xf6 67 68 #define F71808FG_FLAG_WDOUT_EN 7 69 70 #define F71808FG_FLAG_WDTMOUT_STS 6 71 #define F71808FG_FLAG_WD_EN 5 72 #define F71808FG_FLAG_WD_PULSE 4 73 #define F71808FG_FLAG_WD_UNIT 3 74 75 #define F81865_REG_WDO_CONF 0xfa 76 #define F81865_FLAG_WDOUT_EN 0 77 78 /* Default values */ 79 #define WATCHDOG_TIMEOUT 60 /* 1 minute default timeout */ 80 #define WATCHDOG_MAX_TIMEOUT (60 * 255) 81 #define WATCHDOG_PULSE_WIDTH 125 /* 125 ms, default pulse width for 82 watchdog signal */ 83 #define WATCHDOG_F71862FG_PIN 63 /* default watchdog reset output 84 pin number 63 */ 85 86 static unsigned short force_id; 87 module_param(force_id, ushort, 0); 88 MODULE_PARM_DESC(force_id, "Override the detected device ID"); 89 90 static const int max_timeout = WATCHDOG_MAX_TIMEOUT; 91 static int timeout = WATCHDOG_TIMEOUT; /* default timeout in seconds */ 92 module_param(timeout, int, 0); 93 MODULE_PARM_DESC(timeout, 94 "Watchdog timeout in seconds. 1<= timeout <=" 95 __MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default=" 96 __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); 97 98 static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH; 99 module_param(pulse_width, uint, 0); 100 MODULE_PARM_DESC(pulse_width, 101 "Watchdog signal pulse width. 0(=level), 1 ms, 25 ms, 125 ms or 5000 ms" 102 " (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")"); 103 104 static unsigned int f71862fg_pin = WATCHDOG_F71862FG_PIN; 105 module_param(f71862fg_pin, uint, 0); 106 MODULE_PARM_DESC(f71862fg_pin, 107 "Watchdog f71862fg reset output pin configuration. Choose pin 56 or 63" 108 " (default=" __MODULE_STRING(WATCHDOG_F71862FG_PIN)")"); 109 110 static bool nowayout = WATCHDOG_NOWAYOUT; 111 module_param(nowayout, bool, 0444); 112 MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close"); 113 114 static unsigned int start_withtimeout; 115 module_param(start_withtimeout, uint, 0); 116 MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with" 117 " given initial timeout. Zero (default) disables this feature."); 118 119 enum chips { f71808fg, f71858fg, f71862fg, f71869, f71882fg, f71889fg, f81865 }; 120 121 static const char *f71808e_names[] = { 122 "f71808fg", 123 "f71858fg", 124 "f71862fg", 125 "f71869", 126 "f71882fg", 127 "f71889fg", 128 "f81865", 129 }; 130 131 /* Super-I/O Function prototypes */ 132 static inline int superio_inb(int base, int reg); 133 static inline int superio_inw(int base, int reg); 134 static inline void superio_outb(int base, int reg, u8 val); 135 static inline void superio_set_bit(int base, int reg, int bit); 136 static inline void superio_clear_bit(int base, int reg, int bit); 137 static inline int superio_enter(int base); 138 static inline void superio_select(int base, int ld); 139 static inline void superio_exit(int base); 140 141 struct watchdog_data { 142 unsigned short sioaddr; 143 enum chips type; 144 unsigned long opened; 145 struct mutex lock; 146 char expect_close; 147 struct watchdog_info ident; 148 149 unsigned short timeout; 150 u8 timer_val; /* content for the wd_time register */ 151 char minutes_mode; 152 u8 pulse_val; /* pulse width flag */ 153 char pulse_mode; /* enable pulse output mode? */ 154 char caused_reboot; /* last reboot was by the watchdog */ 155 }; 156 157 static struct watchdog_data watchdog = { 158 .lock = __MUTEX_INITIALIZER(watchdog.lock), 159 }; 160 161 /* Super I/O functions */ 162 static inline int superio_inb(int base, int reg) 163 { 164 outb(reg, base); 165 return inb(base + 1); 166 } 167 168 static int superio_inw(int base, int reg) 169 { 170 int val; 171 val = superio_inb(base, reg) << 8; 172 val |= superio_inb(base, reg + 1); 173 return val; 174 } 175 176 static inline void superio_outb(int base, int reg, u8 val) 177 { 178 outb(reg, base); 179 outb(val, base + 1); 180 } 181 182 static inline void superio_set_bit(int base, int reg, int bit) 183 { 184 unsigned long val = superio_inb(base, reg); 185 __set_bit(bit, &val); 186 superio_outb(base, reg, val); 187 } 188 189 static inline void superio_clear_bit(int base, int reg, int bit) 190 { 191 unsigned long val = superio_inb(base, reg); 192 __clear_bit(bit, &val); 193 superio_outb(base, reg, val); 194 } 195 196 static inline int superio_enter(int base) 197 { 198 /* Don't step on other drivers' I/O space by accident */ 199 if (!request_muxed_region(base, 2, DRVNAME)) { 200 pr_err("I/O address 0x%04x already in use\n", (int)base); 201 return -EBUSY; 202 } 203 204 /* according to the datasheet the key must be sent twice! */ 205 outb(SIO_UNLOCK_KEY, base); 206 outb(SIO_UNLOCK_KEY, base); 207 208 return 0; 209 } 210 211 static inline void superio_select(int base, int ld) 212 { 213 outb(SIO_REG_LDSEL, base); 214 outb(ld, base + 1); 215 } 216 217 static inline void superio_exit(int base) 218 { 219 outb(SIO_LOCK_KEY, base); 220 release_region(base, 2); 221 } 222 223 static int watchdog_set_timeout(int timeout) 224 { 225 if (timeout <= 0 226 || timeout > max_timeout) { 227 pr_err("watchdog timeout out of range\n"); 228 return -EINVAL; 229 } 230 231 mutex_lock(&watchdog.lock); 232 233 watchdog.timeout = timeout; 234 if (timeout > 0xff) { 235 watchdog.timer_val = DIV_ROUND_UP(timeout, 60); 236 watchdog.minutes_mode = true; 237 } else { 238 watchdog.timer_val = timeout; 239 watchdog.minutes_mode = false; 240 } 241 242 mutex_unlock(&watchdog.lock); 243 244 return 0; 245 } 246 247 static int watchdog_set_pulse_width(unsigned int pw) 248 { 249 int err = 0; 250 251 mutex_lock(&watchdog.lock); 252 253 if (pw <= 1) { 254 watchdog.pulse_val = 0; 255 } else if (pw <= 25) { 256 watchdog.pulse_val = 1; 257 } else if (pw <= 125) { 258 watchdog.pulse_val = 2; 259 } else if (pw <= 5000) { 260 watchdog.pulse_val = 3; 261 } else { 262 pr_err("pulse width out of range\n"); 263 err = -EINVAL; 264 goto exit_unlock; 265 } 266 267 watchdog.pulse_mode = pw; 268 269 exit_unlock: 270 mutex_unlock(&watchdog.lock); 271 return err; 272 } 273 274 static int watchdog_keepalive(void) 275 { 276 int err = 0; 277 278 mutex_lock(&watchdog.lock); 279 err = superio_enter(watchdog.sioaddr); 280 if (err) 281 goto exit_unlock; 282 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); 283 284 if (watchdog.minutes_mode) 285 /* select minutes for timer units */ 286 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF, 287 F71808FG_FLAG_WD_UNIT); 288 else 289 /* select seconds for timer units */ 290 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF, 291 F71808FG_FLAG_WD_UNIT); 292 293 /* Set timer value */ 294 superio_outb(watchdog.sioaddr, F71808FG_REG_WD_TIME, 295 watchdog.timer_val); 296 297 superio_exit(watchdog.sioaddr); 298 299 exit_unlock: 300 mutex_unlock(&watchdog.lock); 301 return err; 302 } 303 304 static int f71862fg_pin_configure(unsigned short ioaddr) 305 { 306 /* When ioaddr is non-zero the calling function has to take care of 307 mutex handling and superio preparation! */ 308 309 if (f71862fg_pin == 63) { 310 if (ioaddr) { 311 /* SPI must be disabled first to use this pin! */ 312 superio_clear_bit(ioaddr, SIO_REG_ROM_ADDR_SEL, 6); 313 superio_set_bit(ioaddr, SIO_REG_MFUNCT3, 4); 314 } 315 } else if (f71862fg_pin == 56) { 316 if (ioaddr) 317 superio_set_bit(ioaddr, SIO_REG_MFUNCT1, 1); 318 } else { 319 pr_err("Invalid argument f71862fg_pin=%d\n", f71862fg_pin); 320 return -EINVAL; 321 } 322 return 0; 323 } 324 325 static int watchdog_start(void) 326 { 327 /* Make sure we don't die as soon as the watchdog is enabled below */ 328 int err = watchdog_keepalive(); 329 if (err) 330 return err; 331 332 mutex_lock(&watchdog.lock); 333 err = superio_enter(watchdog.sioaddr); 334 if (err) 335 goto exit_unlock; 336 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); 337 338 /* Watchdog pin configuration */ 339 switch (watchdog.type) { 340 case f71808fg: 341 /* Set pin 21 to GPIO23/WDTRST#, then to WDTRST# */ 342 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT2, 3); 343 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 3); 344 break; 345 346 case f71862fg: 347 err = f71862fg_pin_configure(watchdog.sioaddr); 348 if (err) 349 goto exit_superio; 350 break; 351 352 case f71869: 353 /* GPIO14 --> WDTRST# */ 354 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 4); 355 break; 356 357 case f71882fg: 358 /* Set pin 56 to WDTRST# */ 359 superio_set_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 1); 360 break; 361 362 case f71889fg: 363 /* set pin 40 to WDTRST# */ 364 superio_outb(watchdog.sioaddr, SIO_REG_MFUNCT3, 365 superio_inb(watchdog.sioaddr, SIO_REG_MFUNCT3) & 0xcf); 366 break; 367 368 case f81865: 369 /* Set pin 70 to WDTRST# */ 370 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 5); 371 break; 372 373 default: 374 /* 375 * 'default' label to shut up the compiler and catch 376 * programmer errors 377 */ 378 err = -ENODEV; 379 goto exit_superio; 380 } 381 382 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); 383 superio_set_bit(watchdog.sioaddr, SIO_REG_ENABLE, 0); 384 385 if (watchdog.type == f81865) 386 superio_set_bit(watchdog.sioaddr, F81865_REG_WDO_CONF, 387 F81865_FLAG_WDOUT_EN); 388 else 389 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDO_CONF, 390 F71808FG_FLAG_WDOUT_EN); 391 392 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF, 393 F71808FG_FLAG_WD_EN); 394 395 if (watchdog.pulse_mode) { 396 /* Select "pulse" output mode with given duration */ 397 u8 wdt_conf = superio_inb(watchdog.sioaddr, 398 F71808FG_REG_WDT_CONF); 399 400 /* Set WD_PSWIDTH bits (1:0) */ 401 wdt_conf = (wdt_conf & 0xfc) | (watchdog.pulse_val & 0x03); 402 /* Set WD_PULSE to "pulse" mode */ 403 wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE); 404 405 superio_outb(watchdog.sioaddr, F71808FG_REG_WDT_CONF, 406 wdt_conf); 407 } else { 408 /* Select "level" output mode */ 409 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF, 410 F71808FG_FLAG_WD_PULSE); 411 } 412 413 exit_superio: 414 superio_exit(watchdog.sioaddr); 415 exit_unlock: 416 mutex_unlock(&watchdog.lock); 417 418 return err; 419 } 420 421 static int watchdog_stop(void) 422 { 423 int err = 0; 424 425 mutex_lock(&watchdog.lock); 426 err = superio_enter(watchdog.sioaddr); 427 if (err) 428 goto exit_unlock; 429 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); 430 431 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF, 432 F71808FG_FLAG_WD_EN); 433 434 superio_exit(watchdog.sioaddr); 435 436 exit_unlock: 437 mutex_unlock(&watchdog.lock); 438 439 return err; 440 } 441 442 static int watchdog_get_status(void) 443 { 444 int status = 0; 445 446 mutex_lock(&watchdog.lock); 447 status = (watchdog.caused_reboot) ? WDIOF_CARDRESET : 0; 448 mutex_unlock(&watchdog.lock); 449 450 return status; 451 } 452 453 static bool watchdog_is_running(void) 454 { 455 /* 456 * if we fail to determine the watchdog's status assume it to be 457 * running to be on the safe side 458 */ 459 bool is_running = true; 460 461 mutex_lock(&watchdog.lock); 462 if (superio_enter(watchdog.sioaddr)) 463 goto exit_unlock; 464 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); 465 466 is_running = (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0)) 467 && (superio_inb(watchdog.sioaddr, F71808FG_REG_WDT_CONF) 468 & F71808FG_FLAG_WD_EN); 469 470 superio_exit(watchdog.sioaddr); 471 472 exit_unlock: 473 mutex_unlock(&watchdog.lock); 474 return is_running; 475 } 476 477 /* /dev/watchdog api */ 478 479 static int watchdog_open(struct inode *inode, struct file *file) 480 { 481 int err; 482 483 /* If the watchdog is alive we don't need to start it again */ 484 if (test_and_set_bit(0, &watchdog.opened)) 485 return -EBUSY; 486 487 err = watchdog_start(); 488 if (err) { 489 clear_bit(0, &watchdog.opened); 490 return err; 491 } 492 493 if (nowayout) 494 __module_get(THIS_MODULE); 495 496 watchdog.expect_close = 0; 497 return nonseekable_open(inode, file); 498 } 499 500 static int watchdog_release(struct inode *inode, struct file *file) 501 { 502 clear_bit(0, &watchdog.opened); 503 504 if (!watchdog.expect_close) { 505 watchdog_keepalive(); 506 pr_crit("Unexpected close, not stopping watchdog!\n"); 507 } else if (!nowayout) { 508 watchdog_stop(); 509 } 510 return 0; 511 } 512 513 /* 514 * watchdog_write: 515 * @file: file handle to the watchdog 516 * @buf: buffer to write 517 * @count: count of bytes 518 * @ppos: pointer to the position to write. No seeks allowed 519 * 520 * A write to a watchdog device is defined as a keepalive signal. Any 521 * write of data will do, as we we don't define content meaning. 522 */ 523 524 static ssize_t watchdog_write(struct file *file, const char __user *buf, 525 size_t count, loff_t *ppos) 526 { 527 if (count) { 528 if (!nowayout) { 529 size_t i; 530 531 /* In case it was set long ago */ 532 bool expect_close = false; 533 534 for (i = 0; i != count; i++) { 535 char c; 536 if (get_user(c, buf + i)) 537 return -EFAULT; 538 expect_close = (c == 'V'); 539 } 540 541 /* Properly order writes across fork()ed processes */ 542 mutex_lock(&watchdog.lock); 543 watchdog.expect_close = expect_close; 544 mutex_unlock(&watchdog.lock); 545 } 546 547 /* someone wrote to us, we should restart timer */ 548 watchdog_keepalive(); 549 } 550 return count; 551 } 552 553 /* 554 * watchdog_ioctl: 555 * @inode: inode of the device 556 * @file: file handle to the device 557 * @cmd: watchdog command 558 * @arg: argument pointer 559 * 560 * The watchdog API defines a common set of functions for all watchdogs 561 * according to their available features. 562 */ 563 static long watchdog_ioctl(struct file *file, unsigned int cmd, 564 unsigned long arg) 565 { 566 int status; 567 int new_options; 568 int new_timeout; 569 union { 570 struct watchdog_info __user *ident; 571 int __user *i; 572 } uarg; 573 574 uarg.i = (int __user *)arg; 575 576 switch (cmd) { 577 case WDIOC_GETSUPPORT: 578 return copy_to_user(uarg.ident, &watchdog.ident, 579 sizeof(watchdog.ident)) ? -EFAULT : 0; 580 581 case WDIOC_GETSTATUS: 582 status = watchdog_get_status(); 583 if (status < 0) 584 return status; 585 return put_user(status, uarg.i); 586 587 case WDIOC_GETBOOTSTATUS: 588 return put_user(0, uarg.i); 589 590 case WDIOC_SETOPTIONS: 591 if (get_user(new_options, uarg.i)) 592 return -EFAULT; 593 594 if (new_options & WDIOS_DISABLECARD) 595 watchdog_stop(); 596 597 if (new_options & WDIOS_ENABLECARD) 598 return watchdog_start(); 599 600 601 case WDIOC_KEEPALIVE: 602 watchdog_keepalive(); 603 return 0; 604 605 case WDIOC_SETTIMEOUT: 606 if (get_user(new_timeout, uarg.i)) 607 return -EFAULT; 608 609 if (watchdog_set_timeout(new_timeout)) 610 return -EINVAL; 611 612 watchdog_keepalive(); 613 /* Fall */ 614 615 case WDIOC_GETTIMEOUT: 616 return put_user(watchdog.timeout, uarg.i); 617 618 default: 619 return -ENOTTY; 620 621 } 622 } 623 624 static int watchdog_notify_sys(struct notifier_block *this, unsigned long code, 625 void *unused) 626 { 627 if (code == SYS_DOWN || code == SYS_HALT) 628 watchdog_stop(); 629 return NOTIFY_DONE; 630 } 631 632 static const struct file_operations watchdog_fops = { 633 .owner = THIS_MODULE, 634 .llseek = no_llseek, 635 .open = watchdog_open, 636 .release = watchdog_release, 637 .write = watchdog_write, 638 .unlocked_ioctl = watchdog_ioctl, 639 }; 640 641 static struct miscdevice watchdog_miscdev = { 642 .minor = WATCHDOG_MINOR, 643 .name = "watchdog", 644 .fops = &watchdog_fops, 645 }; 646 647 static struct notifier_block watchdog_notifier = { 648 .notifier_call = watchdog_notify_sys, 649 }; 650 651 static int __init watchdog_init(int sioaddr) 652 { 653 int wdt_conf, err = 0; 654 655 /* No need to lock watchdog.lock here because no entry points 656 * into the module have been registered yet. 657 */ 658 watchdog.sioaddr = sioaddr; 659 watchdog.ident.options = WDIOC_SETTIMEOUT 660 | WDIOF_MAGICCLOSE 661 | WDIOF_KEEPALIVEPING; 662 663 snprintf(watchdog.ident.identity, 664 sizeof(watchdog.ident.identity), "%s watchdog", 665 f71808e_names[watchdog.type]); 666 667 err = superio_enter(sioaddr); 668 if (err) 669 return err; 670 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); 671 672 wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF); 673 watchdog.caused_reboot = wdt_conf & BIT(F71808FG_FLAG_WDTMOUT_STS); 674 675 superio_exit(sioaddr); 676 677 err = watchdog_set_timeout(timeout); 678 if (err) 679 return err; 680 err = watchdog_set_pulse_width(pulse_width); 681 if (err) 682 return err; 683 684 err = register_reboot_notifier(&watchdog_notifier); 685 if (err) 686 return err; 687 688 err = misc_register(&watchdog_miscdev); 689 if (err) { 690 pr_err("cannot register miscdev on minor=%d\n", 691 watchdog_miscdev.minor); 692 goto exit_reboot; 693 } 694 695 if (start_withtimeout) { 696 if (start_withtimeout <= 0 697 || start_withtimeout > max_timeout) { 698 pr_err("starting timeout out of range\n"); 699 err = -EINVAL; 700 goto exit_miscdev; 701 } 702 703 err = watchdog_start(); 704 if (err) { 705 pr_err("cannot start watchdog timer\n"); 706 goto exit_miscdev; 707 } 708 709 mutex_lock(&watchdog.lock); 710 err = superio_enter(sioaddr); 711 if (err) 712 goto exit_unlock; 713 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT); 714 715 if (start_withtimeout > 0xff) { 716 /* select minutes for timer units */ 717 superio_set_bit(sioaddr, F71808FG_REG_WDT_CONF, 718 F71808FG_FLAG_WD_UNIT); 719 superio_outb(sioaddr, F71808FG_REG_WD_TIME, 720 DIV_ROUND_UP(start_withtimeout, 60)); 721 } else { 722 /* select seconds for timer units */ 723 superio_clear_bit(sioaddr, F71808FG_REG_WDT_CONF, 724 F71808FG_FLAG_WD_UNIT); 725 superio_outb(sioaddr, F71808FG_REG_WD_TIME, 726 start_withtimeout); 727 } 728 729 superio_exit(sioaddr); 730 mutex_unlock(&watchdog.lock); 731 732 if (nowayout) 733 __module_get(THIS_MODULE); 734 735 pr_info("watchdog started with initial timeout of %u sec\n", 736 start_withtimeout); 737 } 738 739 return 0; 740 741 exit_unlock: 742 mutex_unlock(&watchdog.lock); 743 exit_miscdev: 744 misc_deregister(&watchdog_miscdev); 745 exit_reboot: 746 unregister_reboot_notifier(&watchdog_notifier); 747 748 return err; 749 } 750 751 static int __init f71808e_find(int sioaddr) 752 { 753 u16 devid; 754 int err = superio_enter(sioaddr); 755 if (err) 756 return err; 757 758 devid = superio_inw(sioaddr, SIO_REG_MANID); 759 if (devid != SIO_FINTEK_ID) { 760 pr_debug("Not a Fintek device\n"); 761 err = -ENODEV; 762 goto exit; 763 } 764 765 devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID); 766 switch (devid) { 767 case SIO_F71808_ID: 768 watchdog.type = f71808fg; 769 break; 770 case SIO_F71862_ID: 771 watchdog.type = f71862fg; 772 err = f71862fg_pin_configure(0); /* validate module parameter */ 773 break; 774 case SIO_F71869_ID: 775 case SIO_F71869A_ID: 776 watchdog.type = f71869; 777 break; 778 case SIO_F71882_ID: 779 watchdog.type = f71882fg; 780 break; 781 case SIO_F71889_ID: 782 watchdog.type = f71889fg; 783 break; 784 case SIO_F71858_ID: 785 /* Confirmed (by datasheet) not to have a watchdog. */ 786 err = -ENODEV; 787 goto exit; 788 case SIO_F81865_ID: 789 watchdog.type = f81865; 790 break; 791 default: 792 pr_info("Unrecognized Fintek device: %04x\n", 793 (unsigned int)devid); 794 err = -ENODEV; 795 goto exit; 796 } 797 798 pr_info("Found %s watchdog chip, revision %d\n", 799 f71808e_names[watchdog.type], 800 (int)superio_inb(sioaddr, SIO_REG_DEVREV)); 801 exit: 802 superio_exit(sioaddr); 803 return err; 804 } 805 806 static int __init f71808e_init(void) 807 { 808 static const unsigned short addrs[] = { 0x2e, 0x4e }; 809 int err = -ENODEV; 810 int i; 811 812 for (i = 0; i < ARRAY_SIZE(addrs); i++) { 813 err = f71808e_find(addrs[i]); 814 if (err == 0) 815 break; 816 } 817 if (i == ARRAY_SIZE(addrs)) 818 return err; 819 820 return watchdog_init(addrs[i]); 821 } 822 823 static void __exit f71808e_exit(void) 824 { 825 if (watchdog_is_running()) { 826 pr_warn("Watchdog timer still running, stopping it\n"); 827 watchdog_stop(); 828 } 829 misc_deregister(&watchdog_miscdev); 830 unregister_reboot_notifier(&watchdog_notifier); 831 } 832 833 MODULE_DESCRIPTION("F71808E Watchdog Driver"); 834 MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>"); 835 MODULE_LICENSE("GPL"); 836 837 module_init(f71808e_init); 838 module_exit(f71808e_exit); 839