acpi_powerres.c revision 102470
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 * $FreeBSD: head/sys/dev/acpica/acpi_powerres.c 102470 2002-08-27 07:53:55Z iwasaki $ 27 */ 28 29#include "opt_acpi.h" /* XXX trim includes */ 30#include <sys/param.h> 31#include <sys/kernel.h> 32#include <sys/proc.h> 33#include <sys/lock.h> 34#include <sys/malloc.h> 35#include <sys/mutex.h> 36#include <sys/bus.h> 37#include <sys/conf.h> 38#include <sys/ioccom.h> 39#include <sys/reboot.h> 40#include <sys/sysctl.h> 41#include <sys/systm.h> 42#include <sys/ctype.h> 43 44#include <machine/clock.h> 45 46#include <machine/resource.h> 47 48#include "acpi.h" 49 50#include <dev/acpica/acpivar.h> 51#include <dev/acpica/acpiio.h> 52 53/* 54 * ACPI power resource management. 55 * 56 * Power resource behaviour is slightly complicated by the fact that 57 * a single power resource may provide power for more than one device. 58 * Thus, we must track the device(s) being powered by a given power 59 * resource, and only deactivate it when there are no powered devices. 60 * 61 * Note that this only manages resources for known devices. There is an 62 * ugly case where we may turn of power to a device which is in use because 63 * we don't know that it depends on a given resource. We should perhaps 64 * try to be smarter about this, but a more complete solution would involve 65 * scanning all of the ACPI namespace to find devices we're not currently 66 * aware of, and this raises questions about whether they should be left 67 * on, turned off, etc. 68 * 69 * XXX locking 70 */ 71 72MALLOC_DEFINE(M_ACPIPWR, "acpipwr", "ACPI power resources"); 73 74/* 75 * Hooks for the ACPI CA debugging infrastructure 76 */ 77#define _COMPONENT ACPI_POWER 78ACPI_MODULE_NAME("POWERRES") 79 80/* return values from _STA on a power resource */ 81#define ACPI_PWR_OFF 0 82#define ACPI_PWR_ON 1 83 84/* 85 * A relationship between a power resource and a consumer. 86 */ 87struct acpi_powerreference { 88 struct acpi_powerconsumer *ar_consumer; 89 struct acpi_powerresource *ar_resource; 90 TAILQ_ENTRY(acpi_powerreference) ar_rlink; /* link on resource list */ 91 TAILQ_ENTRY(acpi_powerreference) ar_clink; /* link on consumer */ 92}; 93 94/* 95 * A power-managed device. 96 */ 97struct acpi_powerconsumer { 98 ACPI_HANDLE ac_consumer; /* device which is powered */ 99 int ac_state; 100 TAILQ_ENTRY(acpi_powerconsumer) ac_link; 101 TAILQ_HEAD(,acpi_powerreference) ac_references; 102}; 103 104/* 105 * A power resource. 106 */ 107struct acpi_powerresource { 108 TAILQ_ENTRY(acpi_powerresource) ap_link; 109 TAILQ_HEAD(,acpi_powerreference) ap_references; 110 ACPI_HANDLE ap_resource; /* the resource's handle */ 111 ACPI_INTEGER ap_systemlevel; 112 ACPI_INTEGER ap_order; 113}; 114 115static TAILQ_HEAD(acpi_powerresource_list, acpi_powerresource) acpi_powerresources; 116static TAILQ_HEAD(acpi_powerconsumer_list, acpi_powerconsumer) acpi_powerconsumers; 117 118static ACPI_STATUS acpi_pwr_register_consumer(ACPI_HANDLE consumer); 119static ACPI_STATUS acpi_pwr_deregister_consumer(ACPI_HANDLE consumer); 120static ACPI_STATUS acpi_pwr_register_resource(ACPI_HANDLE res); 121static ACPI_STATUS acpi_pwr_deregister_resource(ACPI_HANDLE res); 122static void acpi_pwr_reference_resource(ACPI_OBJECT *obj, void *arg); 123static ACPI_STATUS acpi_pwr_switch_power(void); 124static struct acpi_powerresource *acpi_pwr_find_resource(ACPI_HANDLE res); 125static struct acpi_powerconsumer *acpi_pwr_find_consumer(ACPI_HANDLE consumer); 126 127/* 128 * Initialise our lists. 129 */ 130static void 131acpi_pwr_init(void *junk) 132{ 133 TAILQ_INIT(&acpi_powerresources); 134 TAILQ_INIT(&acpi_powerconsumers); 135} 136SYSINIT(acpi_powerresource, SI_SUB_TUNABLES, SI_ORDER_ANY, acpi_pwr_init, NULL); 137 138/* 139 * Register a power resource. 140 * 141 * It's OK to call this if we already know about the resource. 142 */ 143static ACPI_STATUS 144acpi_pwr_register_resource(ACPI_HANDLE res) 145{ 146 ACPI_STATUS status; 147 ACPI_BUFFER buf; 148 ACPI_OBJECT *obj; 149 struct acpi_powerresource *rp, *srp; 150 151 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 152 153 rp = NULL; 154 buf.Pointer = NULL; 155 156 /* look to see if we know about this resource */ 157 if (acpi_pwr_find_resource(res) != NULL) 158 return_ACPI_STATUS(AE_OK); /* already know about it */ 159 160 /* allocate a new resource */ 161 if ((rp = malloc(sizeof(*rp), M_ACPIPWR, M_NOWAIT | M_ZERO)) == NULL) { 162 status = AE_NO_MEMORY; 163 goto out; 164 } 165 TAILQ_INIT(&rp->ap_references); 166 rp->ap_resource = res; 167 168 /* get the Power Resource object */ 169 buf.Length = ACPI_ALLOCATE_BUFFER; 170 if (ACPI_FAILURE(status = AcpiEvaluateObject(res, NULL, NULL, &buf))) { 171 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "no power resource object\n")); 172 goto out; 173 } 174 obj = buf.Pointer; 175 if (obj->Type != ACPI_TYPE_POWER) { 176 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "questionable power resource object %s\n", acpi_name(res))); 177 status = AE_TYPE; 178 goto out; 179 } 180 rp->ap_systemlevel = obj->PowerResource.SystemLevel; 181 rp->ap_order = obj->PowerResource.ResourceOrder; 182 183 /* sort the resource into the list */ 184 status = AE_OK; 185 srp = TAILQ_FIRST(&acpi_powerresources); 186 if ((srp == NULL) || (rp->ap_order < srp->ap_order)) { 187 TAILQ_INSERT_HEAD(&acpi_powerresources, rp, ap_link); 188 goto done; 189 } 190 TAILQ_FOREACH(srp, &acpi_powerresources, ap_link) 191 if (rp->ap_order < srp->ap_order) { 192 TAILQ_INSERT_BEFORE(srp, rp, ap_link); 193 goto done; 194 } 195 TAILQ_INSERT_TAIL(&acpi_powerresources, rp, ap_link); 196 197 done: 198 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "registered power resource %s\n", acpi_name(res))); 199 out: 200 if (buf.Pointer != NULL) 201 AcpiOsFree(buf.Pointer); 202 if (ACPI_FAILURE(status) && (rp != NULL)) 203 free(rp, M_ACPIPWR); 204 return_ACPI_STATUS(status); 205} 206 207/* 208 * Deregister a power resource. 209 */ 210static ACPI_STATUS 211acpi_pwr_deregister_resource(ACPI_HANDLE res) 212{ 213 struct acpi_powerresource *rp; 214 215 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 216 217 rp = NULL; 218 219 /* find the resource */ 220 if ((rp = acpi_pwr_find_resource(res)) == NULL) 221 return_ACPI_STATUS(AE_BAD_PARAMETER); 222 223 /* check that there are no consumers referencing this resource */ 224 if (TAILQ_FIRST(&rp->ap_references) != NULL) 225 return_ACPI_STATUS(AE_BAD_PARAMETER); 226 227 /* pull it off the list and free it */ 228 TAILQ_REMOVE(&acpi_powerresources, rp, ap_link); 229 free(rp, M_ACPIPWR); 230 231 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "deregistered power resource %s\n", acpi_name(res))); 232 233 return_ACPI_STATUS(AE_OK); 234} 235 236/* 237 * Register a power consumer. 238 * 239 * It's OK to call this if we already know about the consumer. 240 */ 241static ACPI_STATUS 242acpi_pwr_register_consumer(ACPI_HANDLE consumer) 243{ 244 struct acpi_powerconsumer *pc; 245 246 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 247 248 /* check to see whether we know about this consumer already */ 249 if ((pc = acpi_pwr_find_consumer(consumer)) != NULL) 250 return_ACPI_STATUS(AE_OK); 251 252 /* allocate a new power consumer */ 253 if ((pc = malloc(sizeof(*pc), M_ACPIPWR, M_NOWAIT)) == NULL) 254 return_ACPI_STATUS(AE_NO_MEMORY); 255 TAILQ_INSERT_HEAD(&acpi_powerconsumers, pc, ac_link); 256 TAILQ_INIT(&pc->ac_references); 257 pc->ac_consumer = consumer; 258 259 pc->ac_state = ACPI_STATE_UNKNOWN; /* XXX we should try to find its current state */ 260 261 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "registered power consumer %s\n", acpi_name(consumer))); 262 263 return_ACPI_STATUS(AE_OK); 264} 265 266/* 267 * Deregister a power consumer. 268 * 269 * This should only be done once the consumer has been powered off. 270 * (XXX is this correct? Check once implemented) 271 */ 272static ACPI_STATUS 273acpi_pwr_deregister_consumer(ACPI_HANDLE consumer) 274{ 275 struct acpi_powerconsumer *pc; 276 277 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 278 279 /* find the consumer */ 280 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) 281 return_ACPI_STATUS(AE_BAD_PARAMETER); 282 283 /* make sure the consumer's not referencing anything right now */ 284 if (TAILQ_FIRST(&pc->ac_references) != NULL) 285 return_ACPI_STATUS(AE_BAD_PARAMETER); 286 287 /* pull the consumer off the list and free it */ 288 TAILQ_REMOVE(&acpi_powerconsumers, pc, ac_link); 289 290 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "deregistered power consumer %s\n", acpi_name(consumer))); 291 292 return_ACPI_STATUS(AE_OK); 293} 294 295/* 296 * Set a power consumer to a particular power state. 297 */ 298ACPI_STATUS 299acpi_pwr_switch_consumer(ACPI_HANDLE consumer, int state) 300{ 301 struct acpi_powerconsumer *pc; 302 struct acpi_powerreference *pr; 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 /* find the consumer */ 313 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) { 314 if (ACPI_FAILURE(status = acpi_pwr_register_consumer(consumer))) 315 return_ACPI_STATUS(status); 316 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) { 317 return_ACPI_STATUS(AE_ERROR); /* something very wrong */ 318 } 319 } 320 321 /* check for valid transitions */ 322 if ((pc->ac_state == ACPI_STATE_D3) && (state != ACPI_STATE_D0)) 323 return_ACPI_STATUS(AE_BAD_PARAMETER); /* can only go to D0 from D3 */ 324 325 /* find transition mechanism(s) */ 326 switch(state) { 327 case ACPI_STATE_D0: 328 method_name = "_PS0"; 329 reslist_name = "_PR0"; 330 break; 331 case ACPI_STATE_D1: 332 method_name = "_PS1"; 333 reslist_name = "_PR1"; 334 break; 335 case ACPI_STATE_D2: 336 method_name = "_PS2"; 337 reslist_name = "_PR2"; 338 break; 339 case ACPI_STATE_D3: 340 method_name = "_PS3"; 341 reslist_name = "_PR3"; 342 break; 343 default: 344 return_ACPI_STATUS(AE_BAD_PARAMETER); 345 } 346 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "setup to switch %s D%d -> D%d\n", 347 acpi_name(consumer), pc->ac_state, state)); 348 349 /* 350 * Verify that this state is supported, ie. one of method or 351 * reslist must be present. We need to do this before we go 352 * dereferencing resources (since we might be trying to go to 353 * a state we don't support). 354 * 355 * Note that if any states are supported, the device has to 356 * support D0 and D3. It's never an error to try to go to 357 * D0. 358 */ 359 reslist_buffer.Pointer = NULL; 360 reslist_object = NULL; 361 if (ACPI_FAILURE(AcpiGetHandle(consumer, method_name, &method_handle))) 362 method_handle = NULL; 363 if (ACPI_FAILURE(AcpiGetHandle(consumer, reslist_name, &reslist_handle))) 364 reslist_handle = NULL; 365 if ((reslist_handle == NULL) && (method_handle == NULL)) { 366 if (state == ACPI_STATE_D0) { 367 pc->ac_state = ACPI_STATE_D0; 368 return_ACPI_STATUS(AE_OK); 369 } 370 if (state != ACPI_STATE_D3) { 371 goto bad; 372 } 373 374 /* turn off the resources listed in _PR0 to go to D3. */ 375 if (ACPI_FAILURE(AcpiGetHandle(consumer, "_PR0", &pr0_handle))) { 376 goto bad; 377 } 378 reslist_buffer.Length = ACPI_ALLOCATE_BUFFER; 379 if (ACPI_FAILURE(status = AcpiEvaluateObject(pr0_handle, NULL, NULL, &reslist_buffer))) { 380 goto bad; 381 } 382 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer; 383 if ((reslist_object->Type != ACPI_TYPE_PACKAGE) || 384 (reslist_object->Package.Count == 0)) { 385 goto bad; 386 } 387 AcpiOsFree(reslist_buffer.Pointer); 388 reslist_buffer.Pointer = NULL; 389 reslist_object = NULL; 390 } 391 392 /* 393 * Check that we can actually fetch the list of power resources 394 */ 395 if (reslist_handle != NULL) { 396 reslist_buffer.Length = ACPI_ALLOCATE_BUFFER; 397 if (ACPI_FAILURE(status = AcpiEvaluateObject(reslist_handle, NULL, NULL, &reslist_buffer))) { 398 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't evaluate resource list %s\n", 399 acpi_name(reslist_handle))); 400 goto out; 401 } 402 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer; 403 if (reslist_object->Type != ACPI_TYPE_PACKAGE) { 404 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "resource list is not ACPI_TYPE_PACKAGE (%d)\n", 405 reslist_object->Type)); 406 status = AE_TYPE; 407 goto out; 408 } 409 } 410 411 /* 412 * Now we are ready to switch, so kill off any current power resource references. 413 */ 414 res_changed = 0; 415 while((pr = TAILQ_FIRST(&pc->ac_references)) != NULL) { 416 res_changed = 1; 417 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "removing reference to %s\n", acpi_name(pr->ar_resource->ap_resource))); 418 TAILQ_REMOVE(&pr->ar_resource->ap_references, pr, ar_rlink); 419 TAILQ_REMOVE(&pc->ac_references, pr, ar_clink); 420 free(pr, M_ACPIPWR); 421 } 422 423 /* 424 * Add new power resource references, if we have any. Traverse the 425 * package that we got from evaluating reslist_handle, and look up each 426 * of the resources that are referenced. 427 */ 428 if (reslist_object != NULL) { 429 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "referencing %d new resources\n", 430 reslist_object->Package.Count)); 431 acpi_ForeachPackageObject(reslist_object, acpi_pwr_reference_resource, pc); 432 res_changed = 1; 433 } 434 435 /* 436 * If we changed anything in the resource list, we need to run a switch 437 * pass now. 438 */ 439 if (ACPI_FAILURE(status = acpi_pwr_switch_power())) { 440 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "failed to correctly switch resources to move %s to D%d\n", 441 acpi_name(consumer), state)); 442 goto out; /* XXX is this appropriate? Should we return to previous state? */ 443 } 444 445 /* invoke power state switch method (if present) */ 446 if (method_handle != NULL) { 447 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "invoking state transition method %s\n", 448 acpi_name(method_handle))); 449 if (ACPI_FAILURE(status = AcpiEvaluateObject(method_handle, NULL, NULL, NULL))) { 450 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "failed to set state - %s\n", 451 AcpiFormatException(status))); 452 pc->ac_state = ACPI_STATE_UNKNOWN; 453 goto out; /* XXX Should we return to previous state? */ 454 } 455 } 456 457 /* transition was successful */ 458 pc->ac_state = state; 459 return_ACPI_STATUS(AE_OK); 460 461 bad: 462 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "attempt to set unsupported state D%d\n", 463 state)); 464 status = AE_BAD_PARAMETER; 465 466 out: 467 if (reslist_buffer.Pointer != NULL) 468 AcpiOsFree(reslist_buffer.Pointer); 469 return_ACPI_STATUS(status); 470} 471 472/* 473 * Called to create a reference between a power consumer and a power resource 474 * identified in the object. 475 */ 476static void 477acpi_pwr_reference_resource(ACPI_OBJECT *obj, void *arg) 478{ 479 struct acpi_powerconsumer *pc = (struct acpi_powerconsumer *)arg; 480 struct acpi_powerreference *pr; 481 struct acpi_powerresource *rp; 482 ACPI_HANDLE res; 483 ACPI_STATUS status; 484 485 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 486 487 /* check the object type */ 488 switch (obj->Type) { 489 case ACPI_TYPE_ANY: 490 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "building reference from %s to %s\n", 491 acpi_name(pc->ac_consumer), acpi_name(obj->Reference.Handle))); 492 493 res = obj->Reference.Handle; 494 break; 495 496 case ACPI_TYPE_STRING: 497 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "building reference from %s to %s\n", 498 acpi_name(pc->ac_consumer), obj->String.Pointer)); 499 500 /* get the handle of the resource */ 501 if (ACPI_FAILURE(status = AcpiGetHandle(NULL, obj->String.Pointer, &res))) { 502 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "couldn't find power resource %s\n", 503 obj->String.Pointer)); 504 return_VOID; 505 } 506 break; 507 508 default: 509 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "don't know how to create a power reference to object type %d\n", 510 obj->Type)); 511 return_VOID; 512 } 513 514 /* create/look up the resource */ 515 if (ACPI_FAILURE(status = acpi_pwr_register_resource(res))) { 516 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "couldn't register power resource %s - %s\n", 517 obj->String.Pointer, AcpiFormatException(status))); 518 return_VOID; 519 } 520 if ((rp = acpi_pwr_find_resource(res)) == NULL) { 521 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "power resource list corrupted\n")); 522 return_VOID; 523 } 524 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "found power resource %s\n", acpi_name(rp->ap_resource))); 525 526 /* create a reference between the consumer and resource */ 527 if ((pr = malloc(sizeof(*pr), M_ACPIPWR, M_NOWAIT | M_ZERO)) == NULL) { 528 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "couldn't allocate memory for a power consumer reference\n")); 529 return_VOID; 530 } 531 pr->ar_consumer = pc; 532 pr->ar_resource = rp; 533 TAILQ_INSERT_TAIL(&pc->ac_references, pr, ar_clink); 534 TAILQ_INSERT_TAIL(&rp->ap_references, pr, ar_rlink); 535 536 return_VOID; 537} 538 539 540/* 541 * Switch power resources to conform to the desired state. 542 * 543 * Consumers may have modified the power resource list in an arbitrary 544 * fashion; we sweep it in sequence order. 545 */ 546static ACPI_STATUS 547acpi_pwr_switch_power(void) 548{ 549 struct acpi_powerresource *rp; 550 ACPI_STATUS status; 551 int cur; 552 553 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 554 555 /* 556 * Sweep the list forwards turning things on. 557 */ 558 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) { 559 if (TAILQ_FIRST(&rp->ap_references) == NULL) { 560 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s has no references, not turning on\n", 561 acpi_name(rp->ap_resource))); 562 continue; 563 } 564 565 /* we could cache this if we trusted it not to change under us */ 566 if (ACPI_FAILURE(status = acpi_EvaluateInteger(rp->ap_resource, "_STA", &cur))) { 567 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n", 568 acpi_name(rp->ap_resource), status)); 569 continue; /* XXX is this correct? Always switch if in doubt? */ 570 } 571 572 /* 573 * Switch if required. Note that we ignore the result of the switch 574 * effort; we don't know what to do if it fails, so checking wouldn't 575 * help much. 576 */ 577 if (cur != ACPI_PWR_ON) { 578 if (ACPI_FAILURE(status = AcpiEvaluateObject(rp->ap_resource, "_ON", NULL, NULL))) { 579 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "failed to switch %s on - %s\n", 580 acpi_name(rp->ap_resource), AcpiFormatException(status))); 581 } else { 582 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s on\n", acpi_name(rp->ap_resource))); 583 } 584 } else { 585 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already on\n", acpi_name(rp->ap_resource))); 586 } 587 } 588 589 /* 590 * Sweep the list backwards turning things off. 591 */ 592 TAILQ_FOREACH_REVERSE(rp, &acpi_powerresources, acpi_powerresource_list, ap_link) { 593 if (TAILQ_FIRST(&rp->ap_references) != NULL) { 594 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s has references, not turning off\n", 595 acpi_name(rp->ap_resource))); 596 continue; 597 } 598 599 /* we could cache this if we trusted it not to change under us */ 600 if (ACPI_FAILURE(status = acpi_EvaluateInteger(rp->ap_resource, "_STA", &cur))) { 601 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n", 602 acpi_name(rp->ap_resource), status)); 603 continue; /* XXX is this correct? Always switch if in doubt? */ 604 } 605 606 /* 607 * Switch if required. Note that we ignore the result of the switch 608 * effort; we don't know what to do if it fails, so checking wouldn't 609 * help much. 610 */ 611 if (cur != ACPI_PWR_OFF) { 612 if (ACPI_FAILURE(status = AcpiEvaluateObject(rp->ap_resource, "_OFF", NULL, NULL))) { 613 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "failed to switch %s off - %s\n", 614 acpi_name(rp->ap_resource), AcpiFormatException(status))); 615 } else { 616 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s off\n", acpi_name(rp->ap_resource))); 617 } 618 } else { 619 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already off\n", acpi_name(rp->ap_resource))); 620 } 621 } 622 return_ACPI_STATUS(AE_OK); 623} 624 625/* 626 * Find a power resource's control structure. 627 */ 628static struct acpi_powerresource * 629acpi_pwr_find_resource(ACPI_HANDLE res) 630{ 631 struct acpi_powerresource *rp; 632 633 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 634 635 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) 636 if (rp->ap_resource == res) 637 break; 638 return_PTR(rp); 639} 640 641/* 642 * Find a power consumer's control structure. 643 */ 644static struct acpi_powerconsumer * 645acpi_pwr_find_consumer(ACPI_HANDLE consumer) 646{ 647 struct acpi_powerconsumer *pc; 648 649 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 650 651 TAILQ_FOREACH(pc, &acpi_powerconsumers, ac_link) 652 if (pc->ac_consumer == consumer) 653 break; 654 return_PTR(pc); 655} 656 657