1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011 Sandvine Incorporated ULC. 5 * Copyright (c) 2012 iXsystems, Inc. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 /* 30 * Support for Winbond watchdog. 31 * 32 * With minor abstractions it might be possible to add support for other 33 * different Winbond Super I/O chips as well. Winbond seems to have four 34 * different types of chips, four different ways to get into extended config 35 * mode. 36 * 37 * Note: there is no serialization between the debugging sysctl handlers and 38 * the watchdog functions and possibly others poking the registers at the same 39 * time. For that at least possibly interfering sysctls are hidden by default. 40 */ 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 #include <sys/param.h> 46 #include <sys/kernel.h> 47 #include <sys/systm.h> 48 #include <sys/bus.h> 49 #include <sys/eventhandler.h> 50 #include <sys/module.h> 51 #include <sys/sbuf.h> 52 #include <sys/sysctl.h> 53 #include <sys/watchdog.h> 54 55 #include <dev/superio/superio.h> 56 57 #include <machine/bus.h> 58 #include <machine/resource.h> 59 60 /* 61 * Global registers. 62 */ 63 #define WB_DEVICE_ID_REG 0x20 /* Device ID */ 64 #define WB_DEVICE_REV_REG 0x21 /* Device revision */ 65 #define WB_CR26 0x26 /* Bit6: HEFRAS (base port selector) */ 66 67 /* LDN selection. */ 68 #define WB_LDN_REG 0x07 69 #define WB_LDN_REG_LDN8 0x08 /* GPIO 2, Watchdog */ 70 71 /* 72 * LDN8 (GPIO 2, Watchdog) specific registers and options. 73 */ 74 /* CR30: LDN8 activation control. */ 75 #define WB_LDN8_CR30 0x30 76 #define WB_LDN8_CR30_ACTIVE 0x01 /* 1: LD active */ 77 78 /* CRF5: Watchdog scale, P20. Mapped to reg_1. */ 79 #define WB_LDN8_CRF5 0xF5 80 #define WB_LDN8_CRF5_SCALE 0x08 /* 0: 1s, 1: 60s */ 81 #define WB_LDN8_CRF5_KEYB_P20 0x04 /* 1: keyb P20 forces timeout */ 82 #define WB_LDN8_CRF5_KBRST 0x02 /* 1: timeout causes pin60 kbd reset */ 83 84 /* CRF6: Watchdog Timeout (0 == off). Mapped to reg_timeout. */ 85 #define WB_LDN8_CRF6 0xF6 86 87 /* CRF7: Watchdog mouse, keyb, force, .. Mapped to reg_2. */ 88 #define WB_LDN8_CRF7 0xF7 89 #define WB_LDN8_CRF7_MOUSE 0x80 /* 1: mouse irq resets wd timer */ 90 #define WB_LDN8_CRF7_KEYB 0x40 /* 1: keyb irq resets wd timer */ 91 #define WB_LDN8_CRF7_FORCE 0x20 /* 1: force timeout (self-clear) */ 92 #define WB_LDN8_CRF7_TS 0x10 /* 0: counting, 1: fired */ 93 #define WB_LDN8_CRF7_IRQS 0x0f /* irq source for watchdog, 2 == SMI */ 94 95 enum chips { w83627hf, w83627s, w83697hf, w83697ug, w83637hf, w83627thf, 96 w83687thf, w83627ehf, w83627dhg, w83627uhg, w83667hg, 97 w83627dhg_p, w83667hg_b, nct6775, nct6776, nct6779, nct6791, 98 nct6792, nct6793, nct6795, nct6102 }; 99 100 struct wb_softc { 101 device_t dev; 102 eventhandler_tag ev_tag; 103 enum chips chip; 104 uint8_t ctl_reg; 105 uint8_t time_reg; 106 uint8_t csr_reg; 107 int debug_verbose; 108 109 /* 110 * Special feature to let the watchdog fire at a different 111 * timeout as set by watchdog(4) but still use that API to 112 * re-load it periodically. 113 */ 114 unsigned int timeout_override; 115 116 /* 117 * Space to save current state temporary and for sysctls. 118 * We want to know the timeout value and usually need two 119 * additional registers for options. Do not name them by 120 * register as these might be different by chip. 121 */ 122 uint8_t reg_timeout; 123 uint8_t reg_1; 124 uint8_t reg_2; 125 }; 126 127 struct winbond_vendor_device_id { 128 uint8_t device_id; 129 enum chips chip; 130 const char * descr; 131 } wb_devs[] = { 132 { 133 .device_id = 0x52, 134 .chip = w83627hf, 135 .descr = "Winbond 83627HF/F/HG/G", 136 }, 137 { 138 .device_id = 0x59, 139 .chip = w83627s, 140 .descr = "Winbond 83627S", 141 }, 142 { 143 .device_id = 0x60, 144 .chip = w83697hf, 145 .descr = "Winbond 83697HF", 146 }, 147 { 148 .device_id = 0x68, 149 .chip = w83697ug, 150 .descr = "Winbond 83697UG", 151 }, 152 { 153 .device_id = 0x70, 154 .chip = w83637hf, 155 .descr = "Winbond 83637HF", 156 }, 157 { 158 .device_id = 0x82, 159 .chip = w83627thf, 160 .descr = "Winbond 83627THF", 161 }, 162 { 163 .device_id = 0x85, 164 .chip = w83687thf, 165 .descr = "Winbond 83687THF", 166 }, 167 { 168 .device_id = 0x88, 169 .chip = w83627ehf, 170 .descr = "Winbond 83627EHF", 171 }, 172 { 173 .device_id = 0xa0, 174 .chip = w83627dhg, 175 .descr = "Winbond 83627DHG", 176 }, 177 { 178 .device_id = 0xa2, 179 .chip = w83627uhg, 180 .descr = "Winbond 83627UHG", 181 }, 182 { 183 .device_id = 0xa5, 184 .chip = w83667hg, 185 .descr = "Winbond 83667HG", 186 }, 187 { 188 .device_id = 0xb0, 189 .chip = w83627dhg_p, 190 .descr = "Winbond 83627DHG-P", 191 }, 192 { 193 .device_id = 0xb3, 194 .chip = w83667hg_b, 195 .descr = "Winbond 83667HG-B", 196 }, 197 { 198 .device_id = 0xb4, 199 .chip = nct6775, 200 .descr = "Nuvoton NCT6775", 201 }, 202 { 203 .device_id = 0xc3, 204 .chip = nct6776, 205 .descr = "Nuvoton NCT6776", 206 }, 207 { 208 .device_id = 0xc4, 209 .chip = nct6102, 210 .descr = "Nuvoton NCT6102", 211 }, 212 { 213 .device_id = 0xc5, 214 .chip = nct6779, 215 .descr = "Nuvoton NCT6779", 216 }, 217 { 218 .device_id = 0xc8, 219 .chip = nct6791, 220 .descr = "Nuvoton NCT6791", 221 }, 222 { 223 .device_id = 0xc9, 224 .chip = nct6792, 225 .descr = "Nuvoton NCT6792", 226 }, 227 { 228 .device_id = 0xd1, 229 .chip = nct6793, 230 .descr = "Nuvoton NCT6793", 231 }, 232 { 233 .device_id = 0xd3, 234 .chip = nct6795, 235 .descr = "Nuvoton NCT6795", 236 }, 237 }; 238 239 /* 240 * Return the watchdog related registers as we last read them. This will 241 * usually not give the current timeout or state on whether the watchdog 242 * fired. 243 */ 244 static int 245 sysctl_wb_debug(SYSCTL_HANDLER_ARGS) 246 { 247 struct wb_softc *sc; 248 struct sbuf sb; 249 int error; 250 251 sc = arg1; 252 253 sbuf_new_for_sysctl(&sb, NULL, 64, req); 254 255 sbuf_printf(&sb, "LDN8 (GPIO2, Watchdog): "); 256 sbuf_printf(&sb, "CR%02X 0x%02x ", sc->ctl_reg, sc->reg_1); 257 sbuf_printf(&sb, "CR%02X 0x%02x ", sc->time_reg, sc->reg_timeout); 258 sbuf_printf(&sb, "CR%02X 0x%02x", sc->csr_reg, sc->reg_2); 259 260 error = sbuf_finish(&sb); 261 sbuf_delete(&sb); 262 return (error); 263 } 264 265 /* 266 * Read the current values before returning them. Given this might poke 267 * the registers the same time as the watchdog, this sysctl handler should 268 * be marked CTLFLAG_SKIP to not show up by default. 269 */ 270 static int 271 sysctl_wb_debug_current(SYSCTL_HANDLER_ARGS) 272 { 273 struct wb_softc *sc; 274 275 sc = arg1; 276 277 sc->reg_1 = superio_read(sc->dev, sc->ctl_reg); 278 sc->reg_timeout = superio_read(sc->dev, sc->time_reg); 279 sc->reg_2 = superio_read(sc->dev, sc->csr_reg); 280 281 return (sysctl_wb_debug(oidp, arg1, arg2, req)); 282 } 283 284 /* 285 * Sysctl handlers to force a watchdog timeout or to test the NMI functionality 286 * works as expetced. 287 * For testing we could set a test_nmi flag in the softc that, in case of NMI, a 288 * callback function from trap.c could check whether we fired and not report the 289 * timeout but clear the flag for the sysctl again. This is interesting given a 290 * lot of boards have jumpers to change the action on watchdog timeout or 291 * disable the watchdog completely. 292 * XXX-BZ notyet: currently no general infrastructure exists to do this. 293 */ 294 static int 295 sysctl_wb_force_test_nmi(SYSCTL_HANDLER_ARGS) 296 { 297 struct wb_softc *sc; 298 int error, test, val; 299 300 sc = arg1; 301 test = arg2; 302 303 #ifdef notyet 304 val = sc->test_nmi; 305 #else 306 val = 0; 307 #endif 308 error = sysctl_handle_int(oidp, &val, 0, req); 309 if (error || !req->newptr) 310 return (error); 311 312 #ifdef notyet 313 /* Manually clear the test for a value of 0 and do nothing else. */ 314 if (test && val == 0) { 315 sc->test_nmi = 0; 316 return (0); 317 } 318 319 /* 320 * If we are testing the NMI functionality, set the flag before 321 * forcing the timeout. 322 */ 323 if (test) 324 sc->test_nmi = 1; 325 #endif 326 327 /* Force watchdog to fire. */ 328 sc->reg_2 = superio_read(sc->dev, sc->csr_reg); 329 sc->reg_2 |= WB_LDN8_CRF7_FORCE; 330 superio_write(sc->dev, sc->csr_reg, sc->reg_2); 331 332 return (0); 333 } 334 335 /* 336 * Print current watchdog state. 337 * 338 * Note: it is the responsibility of the caller to update the registers 339 * upfront. 340 */ 341 static void 342 wb_print_state(struct wb_softc *sc, const char *msg) 343 { 344 345 device_printf(sc->dev, "%s%sWatchdog %sabled. %s" 346 "Scaling by %ds, timer at %d (%s=%ds%s). " 347 "CR%02X 0x%02x CR%02X 0x%02x\n", 348 (msg != NULL) ? msg : "", (msg != NULL) ? ": " : "", 349 (sc->reg_timeout > 0x00) ? "en" : "dis", 350 (sc->reg_2 & WB_LDN8_CRF7_TS) ? "Watchdog fired. " : "", 351 (sc->reg_1 & WB_LDN8_CRF5_SCALE) ? 60 : 1, 352 sc->reg_timeout, 353 (sc->reg_timeout > 0x00) ? "<" : "", 354 sc->reg_timeout * ((sc->reg_1 & WB_LDN8_CRF5_SCALE) ? 60 : 1), 355 (sc->reg_timeout > 0x00) ? " left" : "", 356 sc->ctl_reg, sc->reg_1, sc->csr_reg, sc->reg_2); 357 } 358 359 /* 360 * (Re)load the watchdog counter depending on timeout. A timeout of 0 will 361 * disable the watchdog. 362 */ 363 static int 364 wb_set_watchdog(struct wb_softc *sc, unsigned int timeout) 365 { 366 367 if (timeout != 0) { 368 /* 369 * In case an override is set, let it override. It may lead 370 * to strange results as we do not check the input of the sysctl. 371 */ 372 if (sc->timeout_override > 0) 373 timeout = sc->timeout_override; 374 375 /* Make sure we support the requested timeout. */ 376 if (timeout > 255 * 60) 377 return (EINVAL); 378 } 379 380 if (sc->debug_verbose) 381 wb_print_state(sc, "Before watchdog counter (re)load"); 382 383 if (timeout == 0) { 384 /* Disable watchdog. */ 385 sc->reg_timeout = 0; 386 superio_write(sc->dev, sc->time_reg, sc->reg_timeout); 387 388 } else { 389 /* Read current scaling factor. */ 390 sc->reg_1 = superio_read(sc->dev, sc->ctl_reg); 391 392 if (timeout > 255) { 393 /* Set scaling factor to 60s. */ 394 sc->reg_1 |= WB_LDN8_CRF5_SCALE; 395 sc->reg_timeout = (timeout / 60); 396 if (timeout % 60) 397 sc->reg_timeout++; 398 } else { 399 /* Set scaling factor to 1s. */ 400 sc->reg_1 &= ~WB_LDN8_CRF5_SCALE; 401 sc->reg_timeout = timeout; 402 } 403 404 /* In case we fired before we need to clear to fire again. */ 405 sc->reg_2 = superio_read(sc->dev, sc->csr_reg); 406 if (sc->reg_2 & WB_LDN8_CRF7_TS) { 407 sc->reg_2 &= ~WB_LDN8_CRF7_TS; 408 superio_write(sc->dev, sc->csr_reg, sc->reg_2); 409 } 410 411 /* Write back scaling factor. */ 412 superio_write(sc->dev, sc->ctl_reg, sc->reg_1); 413 414 /* Set timer and arm/reset the watchdog. */ 415 superio_write(sc->dev, sc->time_reg, sc->reg_timeout); 416 } 417 418 if (sc->debug_verbose) 419 wb_print_state(sc, "After watchdog counter (re)load"); 420 return (0); 421 } 422 423 /* 424 * watchdog(9) EVENTHANDLER function implementation to (re)load the counter 425 * with the given timeout or disable the watchdog. 426 */ 427 static void 428 wb_watchdog_fn(void *private, u_int cmd, int *error) 429 { 430 struct wb_softc *sc; 431 unsigned int timeout; 432 int e; 433 434 sc = private; 435 KASSERT(sc != NULL, ("%s: watchdog handler function called without " 436 "softc.", __func__)); 437 438 cmd &= WD_INTERVAL; 439 if (cmd > 0 && cmd <= 63) { 440 /* Reset (and arm) watchdog. */ 441 timeout = ((uint64_t)1 << cmd) / 1000000000; 442 if (timeout == 0) 443 timeout = 1; 444 e = wb_set_watchdog(sc, timeout); 445 if (e == 0) { 446 if (error != NULL) 447 *error = 0; 448 } else { 449 /* On error, try to make sure the WD is disabled. */ 450 wb_set_watchdog(sc, 0); 451 } 452 453 } else { 454 /* Disable watchdog. */ 455 e = wb_set_watchdog(sc, 0); 456 if (e != 0 && cmd == 0 && error != NULL) { 457 /* Failed to disable watchdog. */ 458 *error = EOPNOTSUPP; 459 } 460 } 461 } 462 463 static int 464 wb_probe(device_t dev) 465 { 466 char buf[128]; 467 struct wb_softc *sc; 468 int j; 469 uint8_t devid; 470 uint8_t revid; 471 472 if (superio_vendor(dev) != SUPERIO_VENDOR_NUVOTON) 473 return (ENXIO); 474 if (superio_get_type(dev) != SUPERIO_DEV_WDT) 475 return (ENXIO); 476 477 sc = device_get_softc(dev); 478 devid = superio_devid(dev) >> 8; 479 revid = superio_revid(dev); 480 for (j = 0; j < nitems(wb_devs); j++) { 481 if (wb_devs[j].device_id == devid) { 482 sc->chip = wb_devs[j].chip; 483 snprintf(buf, sizeof(buf), 484 "%s (0x%02x/0x%02x) Watchdog Timer", 485 wb_devs[j].descr, devid, revid); 486 device_set_desc_copy(dev, buf); 487 return (BUS_PROBE_SPECIFIC); 488 } 489 } 490 if (bootverbose) { 491 device_printf(dev, 492 "unrecognized chip: devid 0x%02x, revid 0x%02x\n", 493 devid, revid); 494 } 495 return (ENXIO); 496 } 497 498 static int 499 wb_attach(device_t dev) 500 { 501 struct wb_softc *sc; 502 struct sysctl_ctx_list *sctx; 503 struct sysctl_oid *soid; 504 unsigned long timeout; 505 uint8_t t; 506 507 sc = device_get_softc(dev); 508 sc->dev = dev; 509 510 /* Make sure WDT is enabled. */ 511 superio_dev_enable(dev, WB_LDN8_CR30_ACTIVE); 512 513 switch (sc->chip) { 514 case w83697hf: 515 case w83697ug: 516 sc->ctl_reg = 0xf3; 517 sc->time_reg = 0xf4; 518 sc->csr_reg = 0xf7; 519 break; 520 case nct6102: 521 sc->ctl_reg = 0xf0; 522 sc->time_reg = 0xf1; 523 sc->csr_reg = 0xf2; 524 break; 525 default: 526 sc->ctl_reg = 0xf5; 527 sc->time_reg = 0xf6; 528 sc->csr_reg = 0xf7; 529 break; 530 } 531 532 switch (sc->chip) { 533 case w83627hf: 534 case w83627s: 535 t = superio_read(dev, 0x2B) & ~0x10; 536 superio_write(dev, 0x2B, t); /* set GPIO24 to WDT0 */ 537 break; 538 case w83697hf: 539 /* Set pin 119 to WDTO# mode (= CR29, WDT0) */ 540 t = superio_read(dev, 0x29) & ~0x60; 541 t |= 0x20; 542 superio_write(dev, 0x29, t); 543 break; 544 case w83697ug: 545 /* Set pin 118 to WDTO# mode */ 546 t = superio_read(dev, 0x2b) & ~0x04; 547 superio_write(dev, 0x2b, t); 548 break; 549 case w83627thf: 550 t = (superio_read(dev, 0x2B) & ~0x08) | 0x04; 551 superio_write(dev, 0x2B, t); /* set GPIO3 to WDT0 */ 552 break; 553 case w83627dhg: 554 case w83627dhg_p: 555 t = superio_read(dev, 0x2D) & ~0x01; /* PIN77 -> WDT0# */ 556 superio_write(dev, 0x2D, t); /* set GPIO5 to WDT0 */ 557 t = superio_read(dev, sc->ctl_reg); 558 t |= 0x02; /* enable the WDTO# output low pulse 559 * to the KBRST# pin */ 560 superio_write(dev, sc->ctl_reg, t); 561 break; 562 case w83637hf: 563 break; 564 case w83687thf: 565 t = superio_read(dev, 0x2C) & ~0x80; /* PIN47 -> WDT0# */ 566 superio_write(dev, 0x2C, t); 567 break; 568 case w83627ehf: 569 case w83627uhg: 570 case w83667hg: 571 case w83667hg_b: 572 case nct6775: 573 case nct6776: 574 case nct6779: 575 case nct6791: 576 case nct6792: 577 case nct6793: 578 case nct6795: 579 case nct6102: 580 /* 581 * These chips have a fixed WDTO# output pin (W83627UHG), 582 * or support more than one WDTO# output pin. 583 * Don't touch its configuration, and hope the BIOS 584 * does the right thing. 585 */ 586 t = superio_read(dev, sc->ctl_reg); 587 t |= 0x02; /* enable the WDTO# output low pulse 588 * to the KBRST# pin */ 589 superio_write(dev, sc->ctl_reg, t); 590 break; 591 default: 592 break; 593 } 594 595 /* Read the current watchdog configuration. */ 596 sc->reg_1 = superio_read(dev, sc->ctl_reg); 597 sc->reg_timeout = superio_read(dev, sc->time_reg); 598 sc->reg_2 = superio_read(dev, sc->csr_reg); 599 600 /* Print current state if bootverbose or watchdog already enabled. */ 601 if (bootverbose || (sc->reg_timeout > 0x00)) 602 wb_print_state(sc, "Before watchdog attach"); 603 604 sc->reg_1 &= ~WB_LDN8_CRF5_KEYB_P20; 605 sc->reg_1 |= WB_LDN8_CRF5_KBRST; 606 superio_write(dev, sc->ctl_reg, sc->reg_1); 607 608 /* 609 * Clear a previous watchdog timeout event (if still set). 610 * Disable timer reset on mouse interrupts. Leave reset on keyboard, 611 * since one of my boards is getting stuck in reboot without it. 612 */ 613 sc->reg_2 &= ~(WB_LDN8_CRF7_MOUSE|WB_LDN8_CRF7_TS); 614 superio_write(dev, sc->csr_reg, sc->reg_2); 615 616 /* Read global timeout override tunable, Add per device sysctls. */ 617 if (TUNABLE_ULONG_FETCH("hw.wbwd.timeout_override", &timeout)) { 618 if (timeout > 0) 619 sc->timeout_override = timeout; 620 } 621 sctx = device_get_sysctl_ctx(dev); 622 soid = device_get_sysctl_tree(dev); 623 SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, 624 "timeout_override", CTLFLAG_RW, &sc->timeout_override, 0, 625 "Timeout in seconds overriding default watchdog timeout"); 626 SYSCTL_ADD_INT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, 627 "debug_verbose", CTLFLAG_RW, &sc->debug_verbose, 0, 628 "Enables extra debugging information"); 629 SYSCTL_ADD_PROC(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "debug", 630 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NEEDGIANT, sc, 0, 631 sysctl_wb_debug, "A", 632 "Selected register information from last change by driver"); 633 SYSCTL_ADD_PROC(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "debug_current", 634 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_SKIP | CTLFLAG_NEEDGIANT, 635 sc, 0, sysctl_wb_debug_current, "A", 636 "Selected register information (may interfere)"); 637 SYSCTL_ADD_PROC(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "force_timeout", 638 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SKIP | CTLFLAG_NEEDGIANT, sc, 0, 639 sysctl_wb_force_test_nmi, "I", "Enable to force watchdog to fire."); 640 641 /* Register watchdog. */ 642 sc->ev_tag = EVENTHANDLER_REGISTER(watchdog_list, wb_watchdog_fn, sc, 643 0); 644 645 if (bootverbose) 646 wb_print_state(sc, "After watchdog attach"); 647 648 return (0); 649 } 650 651 static int 652 wb_detach(device_t dev) 653 { 654 struct wb_softc *sc; 655 656 sc = device_get_softc(dev); 657 658 /* Unregister and stop the watchdog if running. */ 659 if (sc->ev_tag) 660 EVENTHANDLER_DEREGISTER(watchdog_list, sc->ev_tag); 661 wb_set_watchdog(sc, 0); 662 663 /* Bus subroutines take care of sysctls already. */ 664 665 return (0); 666 } 667 668 static device_method_t wb_methods[] = { 669 /* Device interface */ 670 DEVMETHOD(device_probe, wb_probe), 671 DEVMETHOD(device_attach, wb_attach), 672 DEVMETHOD(device_detach, wb_detach), 673 674 DEVMETHOD_END 675 }; 676 677 static driver_t wb_driver = { 678 "wbwd", 679 wb_methods, 680 sizeof(struct wb_softc) 681 }; 682 683 static devclass_t wb_devclass; 684 685 DRIVER_MODULE(wb, superio, wb_driver, wb_devclass, NULL, NULL); 686 MODULE_DEPEND(wb, superio, 1, 1, 1); 687 MODULE_VERSION(wb, 1); 688