acpi_powerres.c revision 131340
1/*- 2 * Copyright (c) 2001 Michael Smith 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/dev/acpica/acpi_powerres.c 131340 2004-06-30 16:02:40Z njl $"); 29 30#include "opt_acpi.h" 31#include <sys/param.h> 32#include <sys/kernel.h> 33#include <sys/malloc.h> 34#include <sys/bus.h> 35 36#include "acpi.h" 37#include <dev/acpica/acpivar.h> 38 39/* 40 * ACPI power resource management. 41 * 42 * Power resource behaviour is slightly complicated by the fact that 43 * a single power resource may provide power for more than one device. 44 * Thus, we must track the device(s) being powered by a given power 45 * resource, and only deactivate it when there are no powered devices. 46 * 47 * Note that this only manages resources for known devices. There is an 48 * ugly case where we may turn of power to a device which is in use because 49 * we don't know that it depends on a given resource. We should perhaps 50 * try to be smarter about this, but a more complete solution would involve 51 * scanning all of the ACPI namespace to find devices we're not currently 52 * aware of, and this raises questions about whether they should be left 53 * on, turned off, etc. 54 * 55 * XXX locking 56 */ 57 58MALLOC_DEFINE(M_ACPIPWR, "acpipwr", "ACPI power resources"); 59 60/* Hooks for the ACPI CA debugging infrastructure */ 61#define _COMPONENT ACPI_POWERRES 62ACPI_MODULE_NAME("POWERRES") 63 64/* Return values from _STA on a power resource */ 65#define ACPI_PWR_OFF 0 66#define ACPI_PWR_ON 1 67 68/* A relationship between a power resource and a consumer. */ 69struct acpi_powerreference { 70 struct acpi_powerconsumer *ar_consumer; 71 struct acpi_powerresource *ar_resource; 72 TAILQ_ENTRY(acpi_powerreference) ar_rlink; /* link on resource list */ 73 TAILQ_ENTRY(acpi_powerreference) ar_clink; /* link on consumer */ 74}; 75 76/* A power-managed device. */ 77struct acpi_powerconsumer { 78 /* Device which is powered */ 79 ACPI_HANDLE ac_consumer; 80 int ac_state; 81 TAILQ_ENTRY(acpi_powerconsumer) ac_link; 82 TAILQ_HEAD(,acpi_powerreference) ac_references; 83}; 84 85/* A power resource. */ 86struct acpi_powerresource { 87 TAILQ_ENTRY(acpi_powerresource) ap_link; 88 TAILQ_HEAD(,acpi_powerreference) ap_references; 89 ACPI_HANDLE ap_resource; 90 ACPI_INTEGER ap_systemlevel; 91 ACPI_INTEGER ap_order; 92}; 93 94static TAILQ_HEAD(acpi_powerresource_list, acpi_powerresource) 95 acpi_powerresources; 96static TAILQ_HEAD(acpi_powerconsumer_list, acpi_powerconsumer) 97 acpi_powerconsumers; 98 99static ACPI_STATUS acpi_pwr_register_consumer(ACPI_HANDLE consumer); 100#ifdef notyet 101static ACPI_STATUS acpi_pwr_deregister_consumer(ACPI_HANDLE consumer); 102#endif /* notyet */ 103static ACPI_STATUS acpi_pwr_register_resource(ACPI_HANDLE res); 104#ifdef notyet 105static ACPI_STATUS acpi_pwr_deregister_resource(ACPI_HANDLE res); 106#endif /* notyet */ 107static void acpi_pwr_reference_resource(ACPI_OBJECT *obj, 108 void *arg); 109static int acpi_pwr_dereference_resource(struct acpi_powerconsumer 110 *pc); 111static ACPI_STATUS acpi_pwr_switch_power(void); 112static struct acpi_powerresource 113 *acpi_pwr_find_resource(ACPI_HANDLE res); 114static struct acpi_powerconsumer 115 *acpi_pwr_find_consumer(ACPI_HANDLE consumer); 116 117/* Initialise our lists. */ 118static void 119acpi_pwr_init(void *junk) 120{ 121 TAILQ_INIT(&acpi_powerresources); 122 TAILQ_INIT(&acpi_powerconsumers); 123} 124SYSINIT(acpi_powerresource, SI_SUB_TUNABLES, SI_ORDER_ANY, acpi_pwr_init, NULL); 125 126/* 127 * Register a power resource. 128 * 129 * It's OK to call this if we already know about the resource. 130 */ 131static ACPI_STATUS 132acpi_pwr_register_resource(ACPI_HANDLE res) 133{ 134 ACPI_STATUS status; 135 ACPI_BUFFER buf; 136 ACPI_OBJECT *obj; 137 struct acpi_powerresource *rp, *srp; 138 139 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 140 141 rp = NULL; 142 buf.Pointer = NULL; 143 144 /* Look to see if we know about this resource */ 145 if (acpi_pwr_find_resource(res) != NULL) 146 return_ACPI_STATUS (AE_OK); /* already know about it */ 147 148 /* Allocate a new resource */ 149 if ((rp = malloc(sizeof(*rp), M_ACPIPWR, M_NOWAIT | M_ZERO)) == NULL) { 150 status = AE_NO_MEMORY; 151 goto out; 152 } 153 TAILQ_INIT(&rp->ap_references); 154 rp->ap_resource = res; 155 156 /* Get the Power Resource object */ 157 buf.Length = ACPI_ALLOCATE_BUFFER; 158 if (ACPI_FAILURE(status = AcpiEvaluateObject(res, NULL, NULL, &buf))) { 159 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "no power resource object\n")); 160 goto out; 161 } 162 obj = buf.Pointer; 163 if (obj->Type != ACPI_TYPE_POWER) { 164 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 165 "questionable power resource object %s\n", 166 acpi_name(res))); 167 status = AE_TYPE; 168 goto out; 169 } 170 rp->ap_systemlevel = obj->PowerResource.SystemLevel; 171 rp->ap_order = obj->PowerResource.ResourceOrder; 172 173 /* Sort the resource into the list */ 174 status = AE_OK; 175 srp = TAILQ_FIRST(&acpi_powerresources); 176 if (srp == NULL || rp->ap_order < srp->ap_order) { 177 TAILQ_INSERT_HEAD(&acpi_powerresources, rp, ap_link); 178 goto done; 179 } 180 TAILQ_FOREACH(srp, &acpi_powerresources, ap_link) { 181 if (rp->ap_order < srp->ap_order) { 182 TAILQ_INSERT_BEFORE(srp, rp, ap_link); 183 goto done; 184 } 185 } 186 TAILQ_INSERT_TAIL(&acpi_powerresources, rp, ap_link); 187 188 done: 189 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 190 "registered power resource %s\n", acpi_name(res))); 191 192 out: 193 if (buf.Pointer != NULL) 194 AcpiOsFree(buf.Pointer); 195 if (ACPI_FAILURE(status) && rp != NULL) 196 free(rp, M_ACPIPWR); 197 return_ACPI_STATUS (status); 198} 199 200#ifdef notyet 201/* 202 * Deregister a power resource. 203 */ 204static ACPI_STATUS 205acpi_pwr_deregister_resource(ACPI_HANDLE res) 206{ 207 struct acpi_powerresource *rp; 208 209 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 210 211 rp = NULL; 212 213 /* Find the resource */ 214 if ((rp = acpi_pwr_find_resource(res)) == NULL) 215 return_ACPI_STATUS (AE_BAD_PARAMETER); 216 217 /* Check that there are no consumers referencing this resource */ 218 if (TAILQ_FIRST(&rp->ap_references) != NULL) 219 return_ACPI_STATUS (AE_BAD_PARAMETER); 220 221 /* Pull it off the list and free it */ 222 TAILQ_REMOVE(&acpi_powerresources, rp, ap_link); 223 free(rp, M_ACPIPWR); 224 225 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "deregistered power resource %s\n", 226 acpi_name(res))); 227 228 return_ACPI_STATUS (AE_OK); 229} 230#endif /* notyet */ 231 232/* 233 * Register a power consumer. 234 * 235 * It's OK to call this if we already know about the consumer. 236 */ 237static ACPI_STATUS 238acpi_pwr_register_consumer(ACPI_HANDLE consumer) 239{ 240 struct acpi_powerconsumer *pc; 241 242 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 243 244 /* Check to see whether we know about this consumer already */ 245 if ((pc = acpi_pwr_find_consumer(consumer)) != NULL) 246 return_ACPI_STATUS (AE_OK); 247 248 /* Allocate a new power consumer */ 249 if ((pc = malloc(sizeof(*pc), M_ACPIPWR, M_NOWAIT)) == NULL) 250 return_ACPI_STATUS (AE_NO_MEMORY); 251 TAILQ_INSERT_HEAD(&acpi_powerconsumers, pc, ac_link); 252 TAILQ_INIT(&pc->ac_references); 253 pc->ac_consumer = consumer; 254 255 /* XXX we should try to find its current state */ 256 pc->ac_state = ACPI_STATE_UNKNOWN; 257 258 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "registered power consumer %s\n", 259 acpi_name(consumer))); 260 261 return_ACPI_STATUS (AE_OK); 262} 263 264#ifdef notyet 265/* 266 * Deregister a power consumer. 267 * 268 * This should only be done once the consumer has been powered off. 269 * (XXX is this correct? Check once implemented) 270 */ 271static ACPI_STATUS 272acpi_pwr_deregister_consumer(ACPI_HANDLE consumer) 273{ 274 struct acpi_powerconsumer *pc; 275 276 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 277 278 /* Find the consumer */ 279 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) 280 return_ACPI_STATUS (AE_BAD_PARAMETER); 281 282 /* Make sure the consumer's not referencing anything right now */ 283 if (TAILQ_FIRST(&pc->ac_references) != NULL) 284 return_ACPI_STATUS (AE_BAD_PARAMETER); 285 286 /* Pull the consumer off the list and free it */ 287 TAILQ_REMOVE(&acpi_powerconsumers, pc, ac_link); 288 289 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "deregistered power consumer %s\n", 290 acpi_name(consumer))); 291 292 return_ACPI_STATUS (AE_OK); 293} 294#endif /* notyet */ 295 296/* 297 * Set a power consumer to a particular power state. 298 */ 299ACPI_STATUS 300acpi_pwr_switch_consumer(ACPI_HANDLE consumer, int state) 301{ 302 struct acpi_powerconsumer *pc; 303 ACPI_HANDLE method_handle, reslist_handle, pr0_handle; 304 ACPI_BUFFER reslist_buffer; 305 ACPI_OBJECT *reslist_object; 306 ACPI_STATUS status; 307 char *method_name, *reslist_name; 308 int res_changed; 309 310 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 311 312 /* It's never ok to switch a non-existent consumer. */ 313 if (consumer == NULL) 314 return_ACPI_STATUS (AE_NOT_FOUND); 315 316 /* Find the consumer */ 317 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) { 318 if (ACPI_FAILURE(status = acpi_pwr_register_consumer(consumer))) 319 return_ACPI_STATUS (status); 320 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) { 321 return_ACPI_STATUS (AE_ERROR); /* something very wrong */ 322 } 323 } 324 325 /* Check for valid transitions */ 326 if (pc->ac_state == ACPI_STATE_D3 && state != ACPI_STATE_D0) 327 return_ACPI_STATUS (AE_BAD_PARAMETER); /* can only go to D0 from D3 */ 328 329 /* Find transition mechanism(s) */ 330 switch (state) { 331 case ACPI_STATE_D0: 332 method_name = "_PS0"; 333 reslist_name = "_PR0"; 334 break; 335 case ACPI_STATE_D1: 336 method_name = "_PS1"; 337 reslist_name = "_PR1"; 338 break; 339 case ACPI_STATE_D2: 340 method_name = "_PS2"; 341 reslist_name = "_PR2"; 342 break; 343 case ACPI_STATE_D3: 344 method_name = "_PS3"; 345 reslist_name = "_PR3"; 346 break; 347 default: 348 return_ACPI_STATUS (AE_BAD_PARAMETER); 349 } 350 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "setup to switch %s D%d -> D%d\n", 351 acpi_name(consumer), pc->ac_state, state)); 352 353 /* 354 * Verify that this state is supported, ie. one of method or 355 * reslist must be present. We need to do this before we go 356 * dereferencing resources (since we might be trying to go to 357 * a state we don't support). 358 * 359 * Note that if any states are supported, the device has to 360 * support D0 and D3. It's never an error to try to go to 361 * D0. 362 */ 363 status = AE_BAD_PARAMETER; 364 reslist_buffer.Pointer = NULL; 365 reslist_object = NULL; 366 if (ACPI_FAILURE(AcpiGetHandle(consumer, method_name, &method_handle))) 367 method_handle = NULL; 368 if (ACPI_FAILURE(AcpiGetHandle(consumer, reslist_name, &reslist_handle))) 369 reslist_handle = NULL; 370 if (reslist_handle == NULL && method_handle == NULL) { 371 if (state == ACPI_STATE_D0) { 372 pc->ac_state = ACPI_STATE_D0; 373 return_ACPI_STATUS (AE_OK); 374 } 375 if (state != ACPI_STATE_D3) 376 goto bad; 377 378 /* 379 * Turn off the resources listed in _PR0 to go to D3. If there is 380 * no _PR0 method, this object doesn't support ACPI power states. 381 */ 382 if (ACPI_FAILURE(AcpiGetHandle(consumer, "_PR0", &pr0_handle))) { 383 status = AE_NOT_FOUND; 384 goto bad; 385 } 386 reslist_buffer.Length = ACPI_ALLOCATE_BUFFER; 387 status = AcpiEvaluateObject(pr0_handle, NULL, NULL, &reslist_buffer); 388 if (ACPI_FAILURE(status)) 389 goto bad; 390 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer; 391 if (reslist_object->Type != ACPI_TYPE_PACKAGE || 392 reslist_object->Package.Count == 0) 393 goto bad; 394 AcpiOsFree(reslist_buffer.Pointer); 395 reslist_buffer.Pointer = NULL; 396 reslist_object = NULL; 397 } 398 399 /* 400 * Check that we can actually fetch the list of power resources 401 */ 402 if (reslist_handle != NULL) { 403 reslist_buffer.Length = ACPI_ALLOCATE_BUFFER; 404 status = AcpiEvaluateObject(reslist_handle, NULL, NULL, 405 &reslist_buffer); 406 if (ACPI_FAILURE(status)) { 407 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 408 "can't evaluate resource list %s\n", 409 acpi_name(reslist_handle))); 410 goto out; 411 } 412 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer; 413 if (reslist_object->Type != ACPI_TYPE_PACKAGE) { 414 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 415 "resource list is not ACPI_TYPE_PACKAGE (%d)\n", 416 reslist_object->Type)); 417 status = AE_TYPE; 418 goto out; 419 } 420 } 421 422 /* 423 * Now we are ready to switch, so kill off any current power 424 * resource references. 425 */ 426 res_changed = acpi_pwr_dereference_resource(pc); 427 428 /* 429 * Add new power resource references, if we have any. Traverse the 430 * package that we got from evaluating reslist_handle, and look up each 431 * of the resources that are referenced. 432 */ 433 if (reslist_object != NULL) { 434 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "referencing %d new resources\n", 435 reslist_object->Package.Count)); 436 acpi_ForeachPackageObject(reslist_object, acpi_pwr_reference_resource, 437 pc); 438 res_changed = 1; 439 } 440 441 /* 442 * If we changed anything in the resource list, we need to run a switch 443 * pass now. 444 */ 445 if (ACPI_FAILURE(status = acpi_pwr_switch_power())) { 446 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 447 "failed to switch resources from %s to D%d\n", 448 acpi_name(consumer), state)); 449 450 /* XXX is this appropriate? Should we return to previous state? */ 451 goto out; 452 } 453 454 /* Invoke power state switch method (if present) */ 455 if (method_handle != NULL) { 456 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 457 "invoking state transition method %s\n", 458 acpi_name(method_handle))); 459 status = AcpiEvaluateObject(method_handle, NULL, NULL, NULL); 460 if (ACPI_FAILURE(status)) { 461 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "failed to set state - %s\n", 462 AcpiFormatException(status))); 463 pc->ac_state = ACPI_STATE_UNKNOWN; 464 465 /* XXX Should we return to previous state? */ 466 goto out; 467 } 468 } 469 470 /* Transition was successful */ 471 pc->ac_state = state; 472 return_ACPI_STATUS (AE_OK); 473 474 bad: 475 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 476 "attempt to set unsupported state D%d\n", state)); 477 478 out: 479 if (reslist_buffer.Pointer != NULL) 480 AcpiOsFree(reslist_buffer.Pointer); 481 return_ACPI_STATUS (status); 482} 483 484/* Enable or disable a power resource for wake */ 485ACPI_STATUS 486acpi_pwr_wake_enable(ACPI_HANDLE consumer, int enable) 487{ 488 ACPI_STATUS status; 489 struct acpi_powerconsumer *pc; 490 struct acpi_prw_data prw; 491 int i; 492 493 if (consumer == NULL) 494 return (AE_BAD_PARAMETER); 495 496 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) { 497 if (ACPI_FAILURE(status = acpi_pwr_register_consumer(consumer))) 498 return_ACPI_STATUS (status); 499 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) { 500 return_ACPI_STATUS (AE_ERROR); /* something very wrong */ 501 } 502 } 503 504 if (acpi_parse_prw(consumer, &prw) != 0) 505 return (AE_OK); 506 for (i = 0; i < prw.power_res_count; i++) 507 if (enable) 508 acpi_pwr_reference_resource(&prw.power_res[i], pc); 509 else 510 acpi_pwr_dereference_resource(pc); 511 512 if (prw.power_res_count > 0) 513 acpi_pwr_switch_power(); 514 515 return (AE_OK); 516} 517 518/* 519 * Called to create a reference between a power consumer and a power resource 520 * identified in the object. 521 */ 522static void 523acpi_pwr_reference_resource(ACPI_OBJECT *obj, void *arg) 524{ 525 struct acpi_powerconsumer *pc = (struct acpi_powerconsumer *)arg; 526 struct acpi_powerreference *pr; 527 struct acpi_powerresource *rp; 528 ACPI_HANDLE res; 529 ACPI_STATUS status; 530 531 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 532 533 res = acpi_GetReference(NULL, obj); 534 if (res == NULL) { 535 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 536 "can't create a power reference for object type %d\n", 537 obj->Type)); 538 return_VOID; 539 } 540 541 /* Create/look up the resource */ 542 if (ACPI_FAILURE(status = acpi_pwr_register_resource(res))) { 543 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 544 "couldn't register power resource %s - %s\n", 545 obj->String.Pointer, AcpiFormatException(status))); 546 return_VOID; 547 } 548 if ((rp = acpi_pwr_find_resource(res)) == NULL) { 549 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "power resource list corrupted\n")); 550 return_VOID; 551 } 552 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "found power resource %s\n", 553 acpi_name(rp->ap_resource))); 554 555 /* Create a reference between the consumer and resource */ 556 if ((pr = malloc(sizeof(*pr), M_ACPIPWR, M_NOWAIT | M_ZERO)) == NULL) { 557 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 558 "allocation failed for a power consumer reference\n")); 559 return_VOID; 560 } 561 pr->ar_consumer = pc; 562 pr->ar_resource = rp; 563 TAILQ_INSERT_TAIL(&pc->ac_references, pr, ar_clink); 564 TAILQ_INSERT_TAIL(&rp->ap_references, pr, ar_rlink); 565 566 return_VOID; 567} 568 569static int 570acpi_pwr_dereference_resource(struct acpi_powerconsumer *pc) 571{ 572 struct acpi_powerreference *pr; 573 int changed; 574 575 changed = 0; 576 while ((pr = TAILQ_FIRST(&pc->ac_references)) != NULL) { 577 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "removing reference to %s\n", 578 acpi_name(pr->ar_resource->ap_resource))); 579 TAILQ_REMOVE(&pr->ar_resource->ap_references, pr, ar_rlink); 580 TAILQ_REMOVE(&pc->ac_references, pr, ar_clink); 581 free(pr, M_ACPIPWR); 582 changed = 1; 583 } 584 585 return (changed); 586} 587 588/* 589 * Switch power resources to conform to the desired state. 590 * 591 * Consumers may have modified the power resource list in an arbitrary 592 * fashion; we sweep it in sequence order. 593 */ 594static ACPI_STATUS 595acpi_pwr_switch_power(void) 596{ 597 struct acpi_powerresource *rp; 598 ACPI_STATUS status; 599 int cur; 600 601 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 602 603 /* 604 * Sweep the list forwards turning things on. 605 */ 606 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) { 607 if (TAILQ_FIRST(&rp->ap_references) == NULL) { 608 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 609 "%s has no references, not turning on\n", 610 acpi_name(rp->ap_resource))); 611 continue; 612 } 613 614 /* We could cache this if we trusted it not to change under us */ 615 status = acpi_GetInteger(rp->ap_resource, "_STA", &cur); 616 if (ACPI_FAILURE(status)) { 617 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n", 618 acpi_name(rp->ap_resource), status)); 619 620 /* XXX is this correct? Always switch if in doubt? */ 621 continue; 622 } 623 624 /* 625 * Switch if required. Note that we ignore the result of the switch 626 * effort; we don't know what to do if it fails, so checking wouldn't 627 * help much. 628 */ 629 if (cur != ACPI_PWR_ON) { 630 status = AcpiEvaluateObject(rp->ap_resource, "_ON", NULL, NULL); 631 if (ACPI_FAILURE(status)) { 632 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 633 "failed to switch %s on - %s\n", 634 acpi_name(rp->ap_resource), 635 AcpiFormatException(status))); 636 } else { 637 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s on\n", 638 acpi_name(rp->ap_resource))); 639 } 640 } else { 641 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already on\n", 642 acpi_name(rp->ap_resource))); 643 } 644 } 645 646 /* Sweep the list backwards turning things off. */ 647 TAILQ_FOREACH_REVERSE(rp, &acpi_powerresources, acpi_powerresource_list, 648 ap_link) { 649 650 if (TAILQ_FIRST(&rp->ap_references) != NULL) { 651 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 652 "%s has references, not turning off\n", 653 acpi_name(rp->ap_resource))); 654 continue; 655 } 656 657 /* We could cache this if we trusted it not to change under us */ 658 status = acpi_GetInteger(rp->ap_resource, "_STA", &cur); 659 if (ACPI_FAILURE(status)) { 660 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n", 661 acpi_name(rp->ap_resource), status)); 662 /* XXX is this correct? Always switch if in doubt? */ 663 continue; 664 } 665 666 /* 667 * Switch if required. Note that we ignore the result of the switch 668 * effort; we don't know what to do if it fails, so checking wouldn't 669 * help much. 670 */ 671 if (cur != ACPI_PWR_OFF) { 672 status = AcpiEvaluateObject(rp->ap_resource, "_OFF", NULL, NULL); 673 if (ACPI_FAILURE(status)) { 674 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 675 "failed to switch %s off - %s\n", 676 acpi_name(rp->ap_resource), 677 AcpiFormatException(status))); 678 } else { 679 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s off\n", 680 acpi_name(rp->ap_resource))); 681 } 682 } else { 683 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already off\n", 684 acpi_name(rp->ap_resource))); 685 } 686 } 687 688 return_ACPI_STATUS (AE_OK); 689} 690 691/* 692 * Find a power resource's control structure. 693 */ 694static struct acpi_powerresource * 695acpi_pwr_find_resource(ACPI_HANDLE res) 696{ 697 struct acpi_powerresource *rp; 698 699 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 700 701 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) { 702 if (rp->ap_resource == res) 703 break; 704 } 705 706 return_PTR (rp); 707} 708 709/* 710 * Find a power consumer's control structure. 711 */ 712static struct acpi_powerconsumer * 713acpi_pwr_find_consumer(ACPI_HANDLE consumer) 714{ 715 struct acpi_powerconsumer *pc; 716 717 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 718 719 TAILQ_FOREACH(pc, &acpi_powerconsumers, ac_link) { 720 if (pc->ac_consumer == consumer) 721 break; 722 } 723 724 return_PTR (pc); 725} 726