acpi_powerres.c revision 133622
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 133622 2004-08-13 06:22:10Z 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 56MALLOC_DEFINE(M_ACPIPWR, "acpipwr", "ACPI power resources"); 57 58/* Hooks for the ACPI CA debugging infrastructure */ 59#define _COMPONENT ACPI_POWERRES 60ACPI_MODULE_NAME("POWERRES") 61 62/* Return values from _STA on a power resource */ 63#define ACPI_PWR_OFF 0 64#define ACPI_PWR_ON 1 65 66/* A relationship between a power resource and a consumer. */ 67struct acpi_powerreference { 68 struct acpi_powerconsumer *ar_consumer; 69 struct acpi_powerresource *ar_resource; 70 TAILQ_ENTRY(acpi_powerreference) ar_rlink; /* link on resource list */ 71 TAILQ_ENTRY(acpi_powerreference) ar_clink; /* link on consumer */ 72}; 73 74/* A power-managed device. */ 75struct acpi_powerconsumer { 76 /* Device which is powered */ 77 ACPI_HANDLE ac_consumer; 78 int ac_state; 79 TAILQ_ENTRY(acpi_powerconsumer) ac_link; 80 TAILQ_HEAD(,acpi_powerreference) ac_references; 81}; 82 83/* A power resource. */ 84struct acpi_powerresource { 85 TAILQ_ENTRY(acpi_powerresource) ap_link; 86 TAILQ_HEAD(,acpi_powerreference) ap_references; 87 ACPI_HANDLE ap_resource; 88 ACPI_INTEGER ap_systemlevel; 89 ACPI_INTEGER ap_order; 90}; 91 92static TAILQ_HEAD(acpi_powerresource_list, acpi_powerresource) 93 acpi_powerresources; 94static TAILQ_HEAD(acpi_powerconsumer_list, acpi_powerconsumer) 95 acpi_powerconsumers; 96ACPI_SERIAL_DECL(powerres, "ACPI power resources"); 97 98static ACPI_STATUS acpi_pwr_register_consumer(ACPI_HANDLE consumer); 99#ifdef notyet 100static ACPI_STATUS acpi_pwr_deregister_consumer(ACPI_HANDLE consumer); 101#endif /* notyet */ 102static ACPI_STATUS acpi_pwr_register_resource(ACPI_HANDLE res); 103#ifdef notyet 104static ACPI_STATUS acpi_pwr_deregister_resource(ACPI_HANDLE res); 105#endif /* notyet */ 106static void acpi_pwr_reference_resource(ACPI_OBJECT *obj, 107 void *arg); 108static int acpi_pwr_dereference_resource(struct acpi_powerconsumer 109 *pc); 110static ACPI_STATUS acpi_pwr_switch_power(void); 111static struct acpi_powerresource 112 *acpi_pwr_find_resource(ACPI_HANDLE res); 113static struct acpi_powerconsumer 114 *acpi_pwr_find_consumer(ACPI_HANDLE consumer); 115 116/* Initialise our lists. */ 117static void 118acpi_pwr_init(void *junk) 119{ 120 TAILQ_INIT(&acpi_powerresources); 121 TAILQ_INIT(&acpi_powerconsumers); 122} 123SYSINIT(acpi_powerresource, SI_SUB_TUNABLES, SI_ORDER_ANY, acpi_pwr_init, NULL); 124 125/* 126 * Register a power resource. 127 * 128 * It's OK to call this if we already know about the resource. 129 */ 130static ACPI_STATUS 131acpi_pwr_register_resource(ACPI_HANDLE res) 132{ 133 ACPI_STATUS status; 134 ACPI_BUFFER buf; 135 ACPI_OBJECT *obj; 136 struct acpi_powerresource *rp, *srp; 137 138 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 139 ACPI_SERIAL_ASSERT(powerres); 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 ACPI_SERIAL_ASSERT(powerres); 211 212 rp = NULL; 213 214 /* Find the resource */ 215 if ((rp = acpi_pwr_find_resource(res)) == NULL) 216 return_ACPI_STATUS (AE_BAD_PARAMETER); 217 218 /* Check that there are no consumers referencing this resource */ 219 if (TAILQ_FIRST(&rp->ap_references) != NULL) 220 return_ACPI_STATUS (AE_BAD_PARAMETER); 221 222 /* Pull it off the list and free it */ 223 TAILQ_REMOVE(&acpi_powerresources, rp, ap_link); 224 free(rp, M_ACPIPWR); 225 226 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "deregistered power resource %s\n", 227 acpi_name(res))); 228 229 return_ACPI_STATUS (AE_OK); 230} 231#endif /* notyet */ 232 233/* 234 * Register a power consumer. 235 * 236 * It's OK to call this if we already know about the consumer. 237 */ 238static ACPI_STATUS 239acpi_pwr_register_consumer(ACPI_HANDLE consumer) 240{ 241 struct acpi_powerconsumer *pc; 242 243 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 244 ACPI_SERIAL_ASSERT(powerres); 245 246 /* Check to see whether we know about this consumer already */ 247 if ((pc = acpi_pwr_find_consumer(consumer)) != NULL) 248 return_ACPI_STATUS (AE_OK); 249 250 /* Allocate a new power consumer */ 251 if ((pc = malloc(sizeof(*pc), M_ACPIPWR, M_NOWAIT)) == NULL) 252 return_ACPI_STATUS (AE_NO_MEMORY); 253 TAILQ_INSERT_HEAD(&acpi_powerconsumers, pc, ac_link); 254 TAILQ_INIT(&pc->ac_references); 255 pc->ac_consumer = consumer; 256 257 /* XXX we should try to find its current state */ 258 pc->ac_state = ACPI_STATE_UNKNOWN; 259 260 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "registered power consumer %s\n", 261 acpi_name(consumer))); 262 263 return_ACPI_STATUS (AE_OK); 264} 265 266#ifdef notyet 267/* 268 * Deregister a power consumer. 269 * 270 * This should only be done once the consumer has been powered off. 271 * (XXX is this correct? Check once implemented) 272 */ 273static ACPI_STATUS 274acpi_pwr_deregister_consumer(ACPI_HANDLE consumer) 275{ 276 struct acpi_powerconsumer *pc; 277 278 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 279 ACPI_SERIAL_ASSERT(powerres); 280 281 /* Find the consumer */ 282 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) 283 return_ACPI_STATUS (AE_BAD_PARAMETER); 284 285 /* Make sure the consumer's not referencing anything right now */ 286 if (TAILQ_FIRST(&pc->ac_references) != NULL) 287 return_ACPI_STATUS (AE_BAD_PARAMETER); 288 289 /* Pull the consumer off the list and free it */ 290 TAILQ_REMOVE(&acpi_powerconsumers, pc, ac_link); 291 free(pc, M_ACPIPWR); 292 293 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "deregistered power consumer %s\n", 294 acpi_name(consumer))); 295 296 return_ACPI_STATUS (AE_OK); 297} 298#endif /* notyet */ 299 300/* 301 * Set a power consumer to a particular power state. 302 */ 303ACPI_STATUS 304acpi_pwr_switch_consumer(ACPI_HANDLE consumer, int state) 305{ 306 struct acpi_powerconsumer *pc; 307 ACPI_HANDLE method_handle, reslist_handle, pr0_handle; 308 ACPI_BUFFER reslist_buffer; 309 ACPI_OBJECT *reslist_object; 310 ACPI_STATUS status; 311 char *method_name, *reslist_name; 312 int res_changed; 313 314 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 315 316 /* It's never ok to switch a non-existent consumer. */ 317 if (consumer == NULL) 318 return_ACPI_STATUS (AE_NOT_FOUND); 319 reslist_buffer.Pointer = NULL; 320 reslist_object = NULL; 321 ACPI_SERIAL_BEGIN(powerres); 322 323 /* Find the consumer */ 324 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) { 325 if (ACPI_FAILURE(status = acpi_pwr_register_consumer(consumer))) 326 goto out; 327 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) 328 panic("acpi added power consumer but can't find it"); 329 } 330 331 /* Check for valid transitions. We can only go to D0 from D3. */ 332 status = AE_BAD_PARAMETER; 333 if (pc->ac_state == ACPI_STATE_D3 && state != ACPI_STATE_D0) 334 goto out; 335 336 /* Find transition mechanism(s) */ 337 switch (state) { 338 case ACPI_STATE_D0: 339 method_name = "_PS0"; 340 reslist_name = "_PR0"; 341 break; 342 case ACPI_STATE_D1: 343 method_name = "_PS1"; 344 reslist_name = "_PR1"; 345 break; 346 case ACPI_STATE_D2: 347 method_name = "_PS2"; 348 reslist_name = "_PR2"; 349 break; 350 case ACPI_STATE_D3: 351 method_name = "_PS3"; 352 reslist_name = "_PR3"; 353 break; 354 default: 355 goto out; 356 } 357 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "setup to switch %s D%d -> D%d\n", 358 acpi_name(consumer), pc->ac_state, state)); 359 360 /* 361 * Verify that this state is supported, ie. one of method or 362 * reslist must be present. We need to do this before we go 363 * dereferencing resources (since we might be trying to go to 364 * a state we don't support). 365 * 366 * Note that if any states are supported, the device has to 367 * support D0 and D3. It's never an error to try to go to 368 * D0. 369 */ 370 if (ACPI_FAILURE(AcpiGetHandle(consumer, method_name, &method_handle))) 371 method_handle = NULL; 372 if (ACPI_FAILURE(AcpiGetHandle(consumer, reslist_name, &reslist_handle))) 373 reslist_handle = NULL; 374 if (reslist_handle == NULL && method_handle == NULL) { 375 if (state == ACPI_STATE_D0) { 376 pc->ac_state = ACPI_STATE_D0; 377 status = AE_OK; 378 goto out; 379 } 380 if (state != ACPI_STATE_D3) { 381 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 382 "attempt to set unsupported state D%d\n", state)); 383 goto out; 384 } 385 386 /* 387 * Turn off the resources listed in _PR0 to go to D3. If there is 388 * no _PR0 method, this object doesn't support ACPI power states. 389 */ 390 if (ACPI_FAILURE(AcpiGetHandle(consumer, "_PR0", &pr0_handle))) { 391 status = AE_NOT_FOUND; 392 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 393 "device missing _PR0 (desired state was D%d)\n", state)); 394 goto out; 395 } 396 reslist_buffer.Length = ACPI_ALLOCATE_BUFFER; 397 status = AcpiEvaluateObject(pr0_handle, NULL, NULL, &reslist_buffer); 398 if (ACPI_FAILURE(status)) { 399 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 400 "can't evaluate _PR0 for device %s, state D%d\n", 401 acpi_name(consumer), state)); 402 goto out; 403 } 404 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer; 405 if (!ACPI_PKG_VALID(reslist_object, 1)) { 406 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 407 "invalid package object for state D%d\n", state)); 408 status = AE_TYPE; 409 goto out; 410 } 411 AcpiOsFree(reslist_buffer.Pointer); 412 reslist_buffer.Pointer = NULL; 413 reslist_object = NULL; 414 } 415 416 /* 417 * Check that we can actually fetch the list of power resources 418 */ 419 if (reslist_handle != NULL) { 420 reslist_buffer.Length = ACPI_ALLOCATE_BUFFER; 421 status = AcpiEvaluateObject(reslist_handle, NULL, NULL, 422 &reslist_buffer); 423 if (ACPI_FAILURE(status)) { 424 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 425 "can't evaluate resource list %s\n", 426 acpi_name(reslist_handle))); 427 goto out; 428 } 429 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer; 430 if (reslist_object->Type != ACPI_TYPE_PACKAGE) { 431 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 432 "resource list is not ACPI_TYPE_PACKAGE (%d)\n", 433 reslist_object->Type)); 434 status = AE_TYPE; 435 goto out; 436 } 437 } 438 439 /* 440 * Now we are ready to switch, so kill off any current power 441 * resource references. 442 */ 443 res_changed = acpi_pwr_dereference_resource(pc); 444 445 /* 446 * Add new power resource references, if we have any. Traverse the 447 * package that we got from evaluating reslist_handle, and look up each 448 * of the resources that are referenced. 449 */ 450 if (reslist_object != NULL) { 451 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "referencing %d new resources\n", 452 reslist_object->Package.Count)); 453 acpi_ForeachPackageObject(reslist_object, acpi_pwr_reference_resource, 454 pc); 455 res_changed = 1; 456 } 457 458 /* 459 * If we changed anything in the resource list, we need to run a switch 460 * pass now. 461 */ 462 if (ACPI_FAILURE(status = acpi_pwr_switch_power())) { 463 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 464 "failed to switch resources from %s to D%d\n", 465 acpi_name(consumer), state)); 466 467 /* XXX is this appropriate? Should we return to previous state? */ 468 goto out; 469 } 470 471 /* Invoke power state switch method (if present) */ 472 if (method_handle != NULL) { 473 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 474 "invoking state transition method %s\n", 475 acpi_name(method_handle))); 476 status = AcpiEvaluateObject(method_handle, NULL, NULL, NULL); 477 if (ACPI_FAILURE(status)) { 478 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "failed to set state - %s\n", 479 AcpiFormatException(status))); 480 pc->ac_state = ACPI_STATE_UNKNOWN; 481 482 /* XXX Should we return to previous state? */ 483 goto out; 484 } 485 } 486 487 /* Transition was successful */ 488 pc->ac_state = state; 489 status = AE_OK; 490 491out: 492 ACPI_SERIAL_END(powerres); 493 if (reslist_buffer.Pointer != NULL) 494 AcpiOsFree(reslist_buffer.Pointer); 495 return_ACPI_STATUS (status); 496} 497 498/* Enable or disable a power resource for wake */ 499ACPI_STATUS 500acpi_pwr_wake_enable(ACPI_HANDLE consumer, int enable) 501{ 502 ACPI_STATUS status; 503 struct acpi_powerconsumer *pc; 504 struct acpi_prw_data prw; 505 int i; 506 507 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 508 509 if (consumer == NULL) 510 return (AE_BAD_PARAMETER); 511 512 ACPI_SERIAL_BEGIN(powerres); 513 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) { 514 if (ACPI_FAILURE(status = acpi_pwr_register_consumer(consumer))) 515 goto out; 516 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) 517 panic("acpi wake added power consumer but can't find it"); 518 } 519 520 status = AE_OK; 521 if (acpi_parse_prw(consumer, &prw) != 0) 522 goto out; 523 for (i = 0; i < prw.power_res_count; i++) 524 if (enable) 525 acpi_pwr_reference_resource(&prw.power_res[i], pc); 526 else 527 acpi_pwr_dereference_resource(pc); 528 529 if (prw.power_res_count > 0) 530 acpi_pwr_switch_power(); 531 532out: 533 ACPI_SERIAL_END(powerres); 534 return (status); 535} 536 537/* 538 * Called to create a reference between a power consumer and a power resource 539 * identified in the object. 540 */ 541static void 542acpi_pwr_reference_resource(ACPI_OBJECT *obj, void *arg) 543{ 544 struct acpi_powerconsumer *pc = (struct acpi_powerconsumer *)arg; 545 struct acpi_powerreference *pr; 546 struct acpi_powerresource *rp; 547 ACPI_HANDLE res; 548 ACPI_STATUS status; 549 550 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 551 ACPI_SERIAL_ASSERT(powerres); 552 553 res = acpi_GetReference(NULL, obj); 554 if (res == NULL) { 555 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 556 "can't create a power reference for object type %d\n", 557 obj->Type)); 558 return_VOID; 559 } 560 561 /* Create/look up the resource */ 562 if (ACPI_FAILURE(status = acpi_pwr_register_resource(res))) { 563 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 564 "couldn't register power resource %s - %s\n", 565 obj->String.Pointer, AcpiFormatException(status))); 566 return_VOID; 567 } 568 if ((rp = acpi_pwr_find_resource(res)) == NULL) { 569 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "power resource list corrupted\n")); 570 return_VOID; 571 } 572 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "found power resource %s\n", 573 acpi_name(rp->ap_resource))); 574 575 /* Create a reference between the consumer and resource */ 576 if ((pr = malloc(sizeof(*pr), M_ACPIPWR, M_NOWAIT | M_ZERO)) == NULL) { 577 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 578 "allocation failed for a power consumer reference\n")); 579 return_VOID; 580 } 581 pr->ar_consumer = pc; 582 pr->ar_resource = rp; 583 TAILQ_INSERT_TAIL(&pc->ac_references, pr, ar_clink); 584 TAILQ_INSERT_TAIL(&rp->ap_references, pr, ar_rlink); 585 586 return_VOID; 587} 588 589static int 590acpi_pwr_dereference_resource(struct acpi_powerconsumer *pc) 591{ 592 struct acpi_powerreference *pr; 593 int changed; 594 595 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 596 ACPI_SERIAL_ASSERT(powerres); 597 598 changed = 0; 599 while ((pr = TAILQ_FIRST(&pc->ac_references)) != NULL) { 600 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "removing reference to %s\n", 601 acpi_name(pr->ar_resource->ap_resource))); 602 TAILQ_REMOVE(&pr->ar_resource->ap_references, pr, ar_rlink); 603 TAILQ_REMOVE(&pc->ac_references, pr, ar_clink); 604 free(pr, M_ACPIPWR); 605 changed = 1; 606 } 607 608 return (changed); 609} 610 611/* 612 * Switch power resources to conform to the desired state. 613 * 614 * Consumers may have modified the power resource list in an arbitrary 615 * fashion; we sweep it in sequence order. 616 */ 617static ACPI_STATUS 618acpi_pwr_switch_power(void) 619{ 620 struct acpi_powerresource *rp; 621 ACPI_STATUS status; 622 int cur; 623 624 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 625 ACPI_SERIAL_ASSERT(powerres); 626 627 /* 628 * Sweep the list forwards turning things on. 629 */ 630 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) { 631 if (TAILQ_FIRST(&rp->ap_references) == NULL) { 632 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 633 "%s has no references, not turning on\n", 634 acpi_name(rp->ap_resource))); 635 continue; 636 } 637 638 /* We could cache this if we trusted it not to change under us */ 639 status = acpi_GetInteger(rp->ap_resource, "_STA", &cur); 640 if (ACPI_FAILURE(status)) { 641 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n", 642 acpi_name(rp->ap_resource), status)); 643 644 /* XXX is this correct? Always switch if in doubt? */ 645 continue; 646 } 647 648 /* 649 * Switch if required. Note that we ignore the result of the switch 650 * effort; we don't know what to do if it fails, so checking wouldn't 651 * help much. 652 */ 653 if (cur != ACPI_PWR_ON) { 654 status = AcpiEvaluateObject(rp->ap_resource, "_ON", NULL, NULL); 655 if (ACPI_FAILURE(status)) { 656 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 657 "failed to switch %s on - %s\n", 658 acpi_name(rp->ap_resource), 659 AcpiFormatException(status))); 660 } else { 661 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s on\n", 662 acpi_name(rp->ap_resource))); 663 } 664 } else { 665 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already on\n", 666 acpi_name(rp->ap_resource))); 667 } 668 } 669 670 /* Sweep the list backwards turning things off. */ 671 TAILQ_FOREACH_REVERSE(rp, &acpi_powerresources, acpi_powerresource_list, 672 ap_link) { 673 674 if (TAILQ_FIRST(&rp->ap_references) != NULL) { 675 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 676 "%s has references, not turning off\n", 677 acpi_name(rp->ap_resource))); 678 continue; 679 } 680 681 /* We could cache this if we trusted it not to change under us */ 682 status = acpi_GetInteger(rp->ap_resource, "_STA", &cur); 683 if (ACPI_FAILURE(status)) { 684 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n", 685 acpi_name(rp->ap_resource), status)); 686 /* XXX is this correct? Always switch if in doubt? */ 687 continue; 688 } 689 690 /* 691 * Switch if required. Note that we ignore the result of the switch 692 * effort; we don't know what to do if it fails, so checking wouldn't 693 * help much. 694 */ 695 if (cur != ACPI_PWR_OFF) { 696 status = AcpiEvaluateObject(rp->ap_resource, "_OFF", NULL, NULL); 697 if (ACPI_FAILURE(status)) { 698 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 699 "failed to switch %s off - %s\n", 700 acpi_name(rp->ap_resource), 701 AcpiFormatException(status))); 702 } else { 703 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s off\n", 704 acpi_name(rp->ap_resource))); 705 } 706 } else { 707 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already off\n", 708 acpi_name(rp->ap_resource))); 709 } 710 } 711 712 return_ACPI_STATUS (AE_OK); 713} 714 715/* 716 * Find a power resource's control structure. 717 */ 718static struct acpi_powerresource * 719acpi_pwr_find_resource(ACPI_HANDLE res) 720{ 721 struct acpi_powerresource *rp; 722 723 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 724 ACPI_SERIAL_ASSERT(powerres); 725 726 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) { 727 if (rp->ap_resource == res) 728 break; 729 } 730 731 return_PTR (rp); 732} 733 734/* 735 * Find a power consumer's control structure. 736 */ 737static struct acpi_powerconsumer * 738acpi_pwr_find_consumer(ACPI_HANDLE consumer) 739{ 740 struct acpi_powerconsumer *pc; 741 742 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 743 ACPI_SERIAL_ASSERT(powerres); 744 745 TAILQ_FOREACH(pc, &acpi_powerconsumers, ac_link) { 746 if (pc->ac_consumer == consumer) 747 break; 748 } 749 750 return_PTR (pc); 751} 752