1 /* $NetBSD: acpi_power.c,v 1.29 2011/01/09 16:22:07 jruoho Exp $ */ 2 3 /*- 4 * Copyright (c) 2009, 2010 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jukka Ruohonen. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /*- 33 * Copyright (c) 2001 Michael Smith 34 * All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 55 * SUCH DAMAGE. 56 */ 57 58 #include <sys/cdefs.h> 59 __KERNEL_RCSID(0, "$NetBSD: acpi_power.c,v 1.29 2011/01/09 16:22:07 jruoho Exp $"); 60 61 #include <sys/param.h> 62 #include <sys/kmem.h> 63 #include <sys/mutex.h> 64 #include <sys/sysctl.h> 65 66 #include <dev/acpi/acpireg.h> 67 #include <dev/acpi/acpivar.h> 68 #include <dev/acpi/acpi_pci.h> 69 #include <dev/acpi/acpi_power.h> 70 71 #define _COMPONENT ACPI_BUS_COMPONENT 72 ACPI_MODULE_NAME ("acpi_power") 73 74 #define ACPI_STA_POW_OFF 0x00 75 #define ACPI_STA_POW_ON 0x01 76 77 /* 78 * References. 79 */ 80 struct acpi_power_ref { 81 ACPI_HANDLE ref_handle; 82 83 SIMPLEQ_ENTRY(acpi_power_ref) ref_list; 84 }; 85 86 /* 87 * Resources. 88 */ 89 struct acpi_power_res { 90 ACPI_HANDLE res_handle; 91 ACPI_INTEGER res_level; 92 ACPI_INTEGER res_order; 93 char res_name[5]; 94 kmutex_t res_mutex; 95 96 TAILQ_ENTRY(acpi_power_res) res_list; 97 SIMPLEQ_HEAD(, acpi_power_ref) ref_head; 98 }; 99 100 static TAILQ_HEAD(, acpi_power_res) res_head = 101 TAILQ_HEAD_INITIALIZER(res_head); 102 103 static int32_t acpi_power_acpinode = CTL_EOL; 104 static int32_t acpi_power_powernode = CTL_EOL; 105 106 static struct acpi_power_res *acpi_power_res_init(ACPI_HANDLE); 107 static struct acpi_power_res *acpi_power_res_get(ACPI_HANDLE); 108 109 static ACPI_STATUS acpi_power_get_direct(struct acpi_devnode *); 110 static ACPI_STATUS acpi_power_get_indirect(struct acpi_devnode *); 111 static ACPI_STATUS acpi_power_switch(struct acpi_devnode *, 112 int, bool); 113 static ACPI_STATUS acpi_power_res_ref(struct acpi_power_res *, 114 ACPI_HANDLE); 115 static ACPI_STATUS acpi_power_res_deref(struct acpi_power_res *, 116 ACPI_HANDLE); 117 static ACPI_STATUS acpi_power_res_sta(ACPI_OBJECT *, void *); 118 119 static ACPI_OBJECT *acpi_power_pkg_get(ACPI_HANDLE, int); 120 static int acpi_power_sysctl(SYSCTLFN_PROTO); 121 static const char *acpi_xname(ACPI_HANDLE); 122 123 static struct acpi_power_res * 124 acpi_power_res_init(ACPI_HANDLE hdl) 125 { 126 struct acpi_power_res *tmp = NULL; 127 struct acpi_power_res *res = NULL; 128 ACPI_OBJECT *obj; 129 ACPI_BUFFER buf; 130 ACPI_STATUS rv; 131 132 rv = acpi_eval_struct(hdl, NULL, &buf); 133 134 if (ACPI_FAILURE(rv)) 135 goto out; 136 137 obj = buf.Pointer; 138 139 if (obj->Type != ACPI_TYPE_POWER) { 140 rv = AE_TYPE; 141 goto out; 142 } 143 144 res = kmem_zalloc(sizeof(*res), KM_SLEEP); 145 146 if (res == NULL) { 147 rv = AE_NO_MEMORY; 148 goto out; 149 } 150 151 res->res_handle = hdl; 152 res->res_level = obj->PowerResource.SystemLevel; 153 res->res_order = obj->PowerResource.ResourceOrder; 154 155 (void)strlcpy(res->res_name, 156 acpi_xname(hdl), sizeof(res->res_name)); 157 158 SIMPLEQ_INIT(&res->ref_head); 159 mutex_init(&res->res_mutex, MUTEX_DEFAULT, IPL_NONE); 160 161 /* 162 * Power resources should be ordered. 163 * 164 * These *should* be enabled from low values to high 165 * values and disabled from high values to low values. 166 */ 167 TAILQ_FOREACH(tmp, &res_head, res_list) { 168 169 if (res->res_order < tmp->res_order) { 170 TAILQ_INSERT_BEFORE(tmp, res, res_list); 171 break; 172 } 173 } 174 175 if (tmp == NULL) 176 TAILQ_INSERT_TAIL(&res_head, res, res_list); 177 178 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s added to the " 179 "power resource queue\n", res->res_name)); 180 181 out: 182 if (buf.Pointer != NULL) 183 ACPI_FREE(buf.Pointer); 184 185 return res; 186 } 187 188 static struct acpi_power_res * 189 acpi_power_res_get(ACPI_HANDLE hdl) 190 { 191 struct acpi_power_res *res; 192 193 TAILQ_FOREACH(res, &res_head, res_list) { 194 195 if (res->res_handle == hdl) 196 return res; 197 } 198 199 return acpi_power_res_init(hdl); 200 } 201 202 bool 203 acpi_power_register(ACPI_HANDLE hdl) 204 { 205 return true; 206 } 207 208 void 209 acpi_power_deregister(ACPI_HANDLE hdl) 210 { 211 struct acpi_devnode *ad = acpi_get_node(hdl); 212 struct acpi_power_res *res; 213 214 if (ad == NULL) 215 return; 216 217 /* 218 * Remove all references in each resource. 219 */ 220 TAILQ_FOREACH(res, &res_head, res_list) 221 (void)acpi_power_res_deref(res, ad->ad_handle); 222 } 223 224 /* 225 * Get the D-state of an ACPI device node. 226 */ 227 bool 228 acpi_power_get(ACPI_HANDLE hdl, int *state) 229 { 230 struct acpi_devnode *ad = acpi_get_node(hdl); 231 ACPI_STATUS rv; 232 233 if (ad == NULL) 234 return false; 235 236 /* 237 * As _PSC may be broken, first try to 238 * retrieve the power state indirectly 239 * via power resources. 240 */ 241 rv = acpi_power_get_indirect(ad); 242 243 if (ACPI_FAILURE(rv)) 244 rv = acpi_power_get_direct(ad); 245 246 if (ACPI_FAILURE(rv)) 247 goto fail; 248 249 KASSERT(ad->ad_state != ACPI_STATE_ERROR); 250 251 if (ad->ad_state < ACPI_STATE_D0 || ad->ad_state > ACPI_STATE_D3) { 252 rv = AE_BAD_VALUE; 253 goto fail; 254 } 255 256 if (state != NULL) 257 *state = ad->ad_state; 258 259 return true; 260 261 fail: 262 ad->ad_state = ACPI_STATE_ERROR; 263 264 if (state != NULL) 265 *state = ad->ad_state; 266 267 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "failed to get power state " 268 "for %s: %s\n", ad->ad_name, AcpiFormatException(rv))); 269 270 return false; 271 } 272 273 static ACPI_STATUS 274 acpi_power_get_direct(struct acpi_devnode *ad) 275 { 276 ACPI_INTEGER val = 0; 277 ACPI_STATUS rv; 278 279 rv = acpi_eval_integer(ad->ad_handle, "_PSC", &val); 280 281 KDASSERT((uint64_t)val < INT_MAX); 282 283 ad->ad_state = (int)val; 284 285 return rv; 286 } 287 288 static ACPI_STATUS 289 acpi_power_get_indirect(struct acpi_devnode *ad) 290 { 291 ACPI_OBJECT *pkg; 292 ACPI_STATUS rv; 293 int i; 294 295 CTASSERT(ACPI_STATE_D0 == 0 && ACPI_STATE_D1 == 1); 296 CTASSERT(ACPI_STATE_D2 == 2 && ACPI_STATE_D3 == 3); 297 298 /* 299 * The device is in a given D-state if all resources are on. 300 * To derive this, evaluate all elements in each _PRx package 301 * (x = 0 ... 3) and break if the noted condition becomes true. 302 */ 303 for (ad->ad_state = ACPI_STATE_D3, i = 0; i < ACPI_STATE_D3; i++) { 304 305 pkg = acpi_power_pkg_get(ad->ad_handle, i); 306 307 if (pkg == NULL) 308 continue; 309 310 /* 311 * For each element in the _PRx package, evaluate _STA 312 * and return AE_OK only if all power resources are on. 313 */ 314 rv = acpi_foreach_package_object(pkg, acpi_power_res_sta, ad); 315 316 if (ACPI_FAILURE(rv) && rv != AE_CTRL_FALSE) 317 goto out; 318 319 if (ACPI_SUCCESS(rv)) { 320 ad->ad_state = i; 321 goto out; 322 } 323 324 ACPI_FREE(pkg); pkg = NULL; 325 } 326 327 KASSERT(ad->ad_state == ACPI_STATE_D3); 328 329 return AE_OK; 330 331 out: 332 ACPI_FREE(pkg); 333 334 return rv; 335 } 336 337 /* 338 * Set the D-state of an ACPI device node. 339 */ 340 bool 341 acpi_power_set(ACPI_HANDLE hdl, int state) 342 { 343 struct acpi_devnode *ad = acpi_get_node(hdl); 344 ACPI_STATUS rv; 345 char path[5]; 346 int old; 347 348 if (ad == NULL) 349 return false; 350 351 if (state < ACPI_STATE_D0 || state > ACPI_STATE_D3) { 352 rv = AE_BAD_PARAMETER; 353 goto fail; 354 } 355 356 if (acpi_power_get(ad->ad_handle, &old) != true) { 357 rv = AE_NOT_FOUND; 358 goto fail; 359 } 360 361 KASSERT(ad->ad_state == old); 362 KASSERT(ad->ad_state != ACPI_STATE_ERROR); 363 364 if (ad->ad_state == state) { 365 rv = AE_ALREADY_EXISTS; 366 goto fail; 367 } 368 369 /* 370 * It is only possible to go to D0 ("on") from D3 ("off"). 371 */ 372 if (ad->ad_state == ACPI_STATE_D3 && state != ACPI_STATE_D0) { 373 rv = AE_BAD_PARAMETER; 374 goto fail; 375 } 376 377 /* 378 * As noted in ACPI 4.0 (appendix A.2.1), the bus power state 379 * should never be lower than the highest state of one of its 380 * devices. Consequently, we cannot set the state to a lower 381 * (i.e. higher power) state than the parent device's state. 382 */ 383 if ((ad->ad_parent != NULL) && 384 (ad->ad_parent->ad_flags & ACPI_DEVICE_POWER) != 0) { 385 386 if (ad->ad_parent->ad_state > state) { 387 rv = AE_ABORT_METHOD; 388 goto fail; 389 } 390 } 391 392 /* 393 * We first sweep through the resources required for the target 394 * state, turning things on and building references. After this 395 * we dereference the resources required for the current state, 396 * turning the resources off as we go. 397 */ 398 rv = acpi_power_switch(ad, state, true); 399 400 if (ACPI_FAILURE(rv) && rv != AE_CTRL_CONTINUE) 401 goto fail; 402 403 rv = acpi_power_switch(ad, ad->ad_state, false); 404 405 if (ACPI_FAILURE(rv) && rv != AE_CTRL_CONTINUE) 406 goto fail; 407 408 /* 409 * Last but not least, invoke the power state switch method, 410 * if available. Because some systems use only _PSx for the 411 * power state transitions, we do this even if there is no _PRx. 412 */ 413 (void)snprintf(path, sizeof(path), "_PS%d", state); 414 (void)AcpiEvaluateObject(ad->ad_handle, path, NULL, NULL); 415 416 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s turned from " 417 "D%d to D%d\n", ad->ad_name, old, state)); 418 419 ad->ad_state = state; 420 421 return true; 422 423 fail: 424 ad->ad_state = ACPI_STATE_ERROR; 425 426 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "failed to set power state to D%d " 427 "for %s: %s\n", state, ad->ad_name, AcpiFormatException(rv))); 428 429 return false; 430 } 431 432 static ACPI_STATUS 433 acpi_power_switch(struct acpi_devnode *ad, int state, bool on) 434 { 435 ACPI_OBJECT *elm, *pkg; 436 ACPI_STATUS rv = AE_OK; 437 ACPI_HANDLE hdl; 438 uint32_t i, n; 439 440 /* 441 * For each element in the _PRx package, fetch 442 * the reference handle, search for this handle 443 * from the power resource queue, and turn the 444 * resource behind the handle on or off. 445 */ 446 pkg = acpi_power_pkg_get(ad->ad_handle, state); 447 448 if (pkg == NULL) 449 return AE_CTRL_CONTINUE; 450 451 n = pkg->Package.Count; 452 453 for (i = 0; i < n; i++) { 454 455 elm = &pkg->Package.Elements[i]; 456 rv = acpi_eval_reference_handle(elm, &hdl); 457 458 if (ACPI_FAILURE(rv)) 459 continue; 460 461 (void)acpi_power_res(hdl, ad->ad_handle, on); 462 } 463 464 ACPI_FREE(pkg); 465 466 return rv; 467 } 468 469 ACPI_STATUS 470 acpi_power_res(ACPI_HANDLE hdl, ACPI_HANDLE ref, bool on) 471 { 472 struct acpi_power_res *res; 473 const char *str; 474 ACPI_STATUS rv; 475 476 /* 477 * Search for the resource. 478 */ 479 res = acpi_power_res_get(hdl); 480 481 if (res == NULL) 482 return AE_NOT_FOUND; 483 484 /* 485 * (De)reference the resource. 486 */ 487 switch (on) { 488 489 case true: 490 rv = acpi_power_res_ref(res, ref); 491 str = "_ON"; 492 break; 493 494 case false: 495 rv = acpi_power_res_deref(res, ref); 496 str = "_OFF"; 497 break; 498 499 default: 500 return AE_BAD_PARAMETER; 501 } 502 503 if (ACPI_FAILURE(rv)) 504 return rv; 505 506 /* 507 * Turn the resource on or off. 508 */ 509 return AcpiEvaluateObject(res->res_handle, str, NULL, NULL); 510 } 511 512 static ACPI_STATUS 513 acpi_power_res_ref(struct acpi_power_res *res, ACPI_HANDLE hdl) 514 { 515 struct acpi_power_ref *ref, *tmp; 516 517 ref = kmem_zalloc(sizeof(*ref), KM_SLEEP); 518 519 if (ref == NULL) 520 return AE_NO_MEMORY; 521 522 mutex_enter(&res->res_mutex); 523 524 SIMPLEQ_FOREACH(tmp, &res->ref_head, ref_list) { 525 526 if (tmp->ref_handle == hdl) 527 goto out; 528 } 529 530 ref->ref_handle = hdl; 531 SIMPLEQ_INSERT_TAIL(&res->ref_head, ref, ref_list); 532 mutex_exit(&res->res_mutex); 533 534 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s referenced " 535 "by %s\n", res->res_name, acpi_xname(hdl))); 536 537 return AE_OK; 538 539 out: 540 mutex_exit(&res->res_mutex); 541 kmem_free(ref, sizeof(*ref)); 542 543 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s already referenced " 544 "by %s?\n", res->res_name, acpi_xname(hdl))); 545 546 return AE_OK; 547 } 548 549 static ACPI_STATUS 550 acpi_power_res_deref(struct acpi_power_res *res, ACPI_HANDLE hdl) 551 { 552 struct acpi_power_ref *ref; 553 554 mutex_enter(&res->res_mutex); 555 556 if (SIMPLEQ_EMPTY(&res->ref_head) != 0) { 557 mutex_exit(&res->res_mutex); 558 return AE_OK; 559 } 560 561 SIMPLEQ_FOREACH(ref, &res->ref_head, ref_list) { 562 563 if (ref->ref_handle == hdl) { 564 SIMPLEQ_REMOVE(&res->ref_head, 565 ref, acpi_power_ref, ref_list); 566 mutex_exit(&res->res_mutex); 567 kmem_free(ref, sizeof(*ref)); 568 mutex_enter(&res->res_mutex); 569 break; 570 } 571 } 572 573 /* 574 * If the queue remains non-empty, 575 * something else is using the resource 576 * and hence it can not be turned off. 577 */ 578 if (SIMPLEQ_EMPTY(&res->ref_head) == 0) { 579 mutex_exit(&res->res_mutex); 580 return AE_ABORT_METHOD; 581 } 582 583 mutex_exit(&res->res_mutex); 584 585 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s dereferenced " 586 "by %s\n", res->res_name, acpi_xname(hdl))); 587 588 return AE_OK; 589 } 590 591 static ACPI_STATUS 592 acpi_power_res_sta(ACPI_OBJECT *elm, void *arg) 593 { 594 ACPI_INTEGER val; 595 ACPI_HANDLE hdl; 596 ACPI_STATUS rv; 597 598 rv = acpi_eval_reference_handle(elm, &hdl); 599 600 if (ACPI_FAILURE(rv)) 601 goto fail; 602 603 rv = acpi_eval_integer(hdl, "_STA", &val); 604 605 if (ACPI_FAILURE(rv)) 606 goto fail; 607 608 KDASSERT((uint64_t)val < INT_MAX); 609 610 if ((int)val != ACPI_STA_POW_ON && (int)val != ACPI_STA_POW_OFF) 611 return AE_BAD_VALUE; 612 613 if ((int)val != ACPI_STA_POW_ON) 614 return AE_CTRL_FALSE; /* XXX: Not an error. */ 615 616 return AE_OK; 617 618 fail: 619 if (rv == AE_CTRL_FALSE) 620 rv = AE_ERROR; 621 622 ACPI_DEBUG_PRINT((ACPI_DB_DEBUG_OBJECT, "failed to evaluate _STA " 623 "for %s: %s\n", acpi_xname(hdl), AcpiFormatException(rv))); 624 625 return rv; 626 } 627 628 static ACPI_OBJECT * 629 acpi_power_pkg_get(ACPI_HANDLE hdl, int state) 630 { 631 char path[5] = "_PR?"; 632 ACPI_OBJECT *obj; 633 ACPI_BUFFER buf; 634 ACPI_STATUS rv; 635 636 path[3] = '0' + state; 637 638 rv = acpi_eval_struct(hdl, path, &buf); 639 640 if (ACPI_FAILURE(rv)) 641 goto fail; 642 643 if (buf.Length == 0) { 644 rv = AE_LIMIT; 645 goto fail; 646 } 647 648 obj = buf.Pointer; 649 650 if (obj->Type != ACPI_TYPE_PACKAGE) { 651 rv = AE_TYPE; 652 goto fail; 653 } 654 655 if (obj->Package.Count == 0) { 656 rv = AE_LIMIT; 657 goto fail; 658 } 659 660 return obj; 661 662 fail: 663 if (buf.Pointer != NULL) 664 ACPI_FREE(buf.Pointer); 665 666 ACPI_DEBUG_PRINT((ACPI_DB_DEBUG_OBJECT, "failed to evaluate %s for " 667 "%s: %s\n", path, acpi_xname(hdl), AcpiFormatException(rv))); 668 669 return NULL; 670 } 671 672 SYSCTL_SETUP(sysctl_acpi_power_setup, "sysctl hw.acpi.power subtree setup") 673 { 674 const struct sysctlnode *anode; 675 int err; 676 677 err = sysctl_createv(NULL, 0, NULL, &anode, 678 CTLFLAG_PERMANENT, CTLTYPE_NODE, "hw", 679 NULL, NULL, 0, NULL, 0, 680 CTL_HW, CTL_EOL); 681 682 if (err != 0) 683 return; 684 685 err = sysctl_createv(NULL, 0, &anode, &anode, 686 CTLFLAG_PERMANENT, CTLTYPE_NODE, "acpi", 687 NULL, NULL, 0, NULL, 0, 688 CTL_CREATE, CTL_EOL); 689 690 if (err != 0) 691 return; 692 693 acpi_power_acpinode = anode->sysctl_num; 694 695 err = sysctl_createv(NULL, 0, &anode, &anode, 696 CTLFLAG_PERMANENT, CTLTYPE_NODE, 697 "power", SYSCTL_DESCR("ACPI device power states"), 698 NULL, 0, NULL, 0, 699 CTL_CREATE, CTL_EOL); 700 701 if (err != 0) 702 return; 703 704 acpi_power_powernode = anode->sysctl_num; 705 } 706 707 void 708 acpi_power_add(struct acpi_devnode *ad) 709 { 710 const char *str = NULL; 711 device_t dev; 712 int err; 713 714 KASSERT(ad != NULL && ad->ad_root != NULL); 715 KASSERT((ad->ad_flags & ACPI_DEVICE_POWER) != 0); 716 717 if (acpi_power_acpinode == CTL_EOL || 718 acpi_power_powernode == CTL_EOL) 719 return; 720 721 if (ad->ad_device != NULL) 722 str = device_xname(ad->ad_device); 723 else { 724 dev = acpi_pcidev_find_dev(ad); 725 726 if (dev != NULL) 727 str = device_xname(dev); 728 } 729 730 if (str == NULL) 731 return; 732 733 err = sysctl_createv(NULL, 0, NULL, NULL, 734 CTLFLAG_READONLY, CTLTYPE_STRING, str, 735 NULL, acpi_power_sysctl, 0, ad, 0, CTL_HW, 736 acpi_power_acpinode, acpi_power_powernode, 737 CTL_CREATE, CTL_EOL); 738 739 if (err != 0) 740 aprint_error_dev(ad->ad_root, "sysctl_createv" 741 "(hw.acpi.power.%s) failed (err %d)\n", str, err); 742 } 743 744 static int 745 acpi_power_sysctl(SYSCTLFN_ARGS) 746 { 747 struct acpi_devnode *ad; 748 struct sysctlnode node; 749 int err, state; 750 char t[3]; 751 752 node = *rnode; 753 ad = rnode->sysctl_data; 754 755 if (acpi_power_get(ad->ad_handle, &state) != true) 756 state = 0; 757 758 (void)memset(t, '\0', sizeof(t)); 759 (void)snprintf(t, sizeof(t), "D%d", state); 760 761 node.sysctl_data = &t; 762 763 err = sysctl_lookup(SYSCTLFN_CALL(&node)); 764 765 if (err || newp == NULL) 766 return err; 767 768 return 0; 769 } 770 771 /* 772 * XXX: Move this to acpi_util.c by refactoring 773 * acpi_name() to optionally return a single name. 774 */ 775 static const char * 776 acpi_xname(ACPI_HANDLE hdl) 777 { 778 static char str[5]; 779 ACPI_BUFFER buf; 780 ACPI_STATUS rv; 781 782 buf.Pointer = str; 783 buf.Length = sizeof(str); 784 785 rv = AcpiGetName(hdl, ACPI_SINGLE_NAME, &buf); 786 787 if (ACPI_FAILURE(rv)) 788 return "????"; 789 790 return str; 791 } 792