acpi_powerres.c revision 80078
150476Speter/*- 226419Sache * Copyright (c) 2001 Michael Smith 326419Sache * All rights reserved. 426419Sache * 526419Sache * Redistribution and use in source and binary forms, with or without 626419Sache * modification, are permitted provided that the following conditions 726419Sache * are met: 836307Sphk * 1. Redistributions of source code must retain the above copyright 936307Sphk * notice, this list of conditions and the following disclaimer. 1036307Sphk * 2. Redistributions in binary form must reproduce the above copyright 1136307Sphk * notice, this list of conditions and the following disclaimer in the 1236307Sphk * documentation and/or other materials provided with the distribution. 1336307Sphk * 1436307Sphk * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1536307Sphk * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1636307Sphk * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1736307Sphk * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1836307Sphk * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1936307Sphk * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2026419Sache * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2126419Sache * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2226419Sache * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2336307Sphk * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2436307Sphk * SUCH DAMAGE. 2536307Sphk * 2636307Sphk * $FreeBSD: head/sys/dev/acpica/acpi_powerres.c 80078 2001-07-21 10:24:37Z msmith $ 2736307Sphk */ 2836307Sphk 2936307Sphk#include "opt_acpi.h" /* XXX trim includes */ 3036307Sphk#include <sys/param.h> 3136307Sphk#include <sys/kernel.h> 3236307Sphk#include <sys/proc.h> 3336307Sphk#include <sys/lock.h> 3436307Sphk#include <sys/malloc.h> 3526419Sache#include <sys/mutex.h> 3626419Sache#include <sys/bus.h> 3726419Sache#include <sys/conf.h> 3836307Sphk#include <sys/ioccom.h> 3936307Sphk#include <sys/reboot.h> 4036307Sphk#include <sys/sysctl.h> 4136307Sphk#include <sys/systm.h> 4236307Sphk#include <sys/ctype.h> 4336307Sphk 4436307Sphk#include <machine/clock.h> 4526419Sache 4626419Sache#include <machine/resource.h> 4726419Sache 4836307Sphk#include "acpi.h" 4936307Sphk 5036307Sphk#include <dev/acpica/acpivar.h> 5136307Sphk#include <dev/acpica/acpiio.h> 5236307Sphk 5336307Sphk/* 5436307Sphk * ACPI power resource management. 5526419Sache * 5626419Sache * Power resource behaviour is slightly complicated by the fact that 5726419Sache * a single power resource may provide power for more than one device. 5826419Sache * Thus, we must track the device(s) being powered by a given power 5926419Sache * resource, and only deactivate it when there are no powered devices. 6026419Sache * 6126419Sache * Note that this only manages resources for known devices. There is an 6226419Sache * ugly case where we may turn of power to a device which is in use because 6326419Sache * we don't know that it depends on a given resource. We should perhaps 6426419Sache * try to be smarter about this, but a more complete solution would involve 6526419Sache * scanning all of the ACPI namespace to find devices we're not currently 6654090Sache * aware of, and this raises questions about whether they should be left 6726419Sache * on, turned off, etc. 6826419Sache * 6926419Sache * XXX locking 7026419Sache */ 7126419Sache 7226419SacheMALLOC_DEFINE(M_ACPIPWR, "acpipwr", "ACPI power resources"); 7326419Sache 7426419Sache/* 7526419Sache * Hooks for the ACPI CA debugging infrastructure 7626419Sache */ 7726419Sache#define _COMPONENT ACPI_POWER 7854090SacheMODULE_NAME("POWERRES") 7953943Sache 8053943Sache/* return values from _STA on a power resource */ 8153943Sache#define ACPI_PWR_OFF 0 8253943Sache#define ACPI_PWR_ON 1 8353943Sache 8453943Sache/* 8553943Sache * A relationship between a power resource and a consumer. 8653943Sache */ 8753943Sachestruct acpi_powerreference { 8853943Sache struct acpi_powerconsumer *ar_consumer; 8953943Sache struct acpi_powerresource *ar_resource; 9053943Sache TAILQ_ENTRY(acpi_powerreference) ar_rlink; /* link on resource list */ 9153943Sache TAILQ_ENTRY(acpi_powerreference) ar_clink; /* link on consumer */ 9253943Sache}; 9353943Sache 9453943Sache/* 9553961Sache * A power-managed device. 9653943Sache */ 9753943Sachestruct acpi_powerconsumer { 9853961Sache ACPI_HANDLE ac_consumer; /* device which is powered */ 9953961Sache int ac_state; 10053961Sache TAILQ_ENTRY(acpi_powerconsumer) ac_link; 10153961Sache 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 115TAILQ_HEAD(acpi_powerresource_list, acpi_powerresource) acpi_powerresources; 116TAILQ_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 FUNCTION_TRACE(__func__); 152 153 rp = NULL; 154 obj = 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 if ((status = acpi_EvaluateIntoBuffer(res, NULL, NULL, &buf)) != AE_OK) { 170 DEBUG_PRINT(TRACE_OBJECTS, ("no power resource object\n")); 171 goto out; 172 } 173 obj = buf.Pointer; 174 if (obj->Type != ACPI_TYPE_POWER) { 175 DEBUG_PRINT(TRACE_OBJECTS, ("questionable power resource object %s\n", acpi_name(res))); 176 status = AE_TYPE; 177 goto out; 178 } 179 rp->ap_systemlevel = obj->PowerResource.SystemLevel; 180 rp->ap_order = obj->PowerResource.ResourceOrder; 181 182 /* sort the resource into the list */ 183 status = AE_OK; 184 srp = TAILQ_FIRST(&acpi_powerresources); 185 if ((srp == NULL) || (rp->ap_order < srp->ap_order)) { 186 TAILQ_INSERT_HEAD(&acpi_powerresources, rp, ap_link); 187 goto done; 188 } 189 TAILQ_FOREACH(srp, &acpi_powerresources, ap_link) 190 if (rp->ap_order < srp->ap_order) { 191 TAILQ_INSERT_BEFORE(srp, rp, ap_link); 192 goto done; 193 } 194 TAILQ_INSERT_TAIL(&acpi_powerresources, rp, ap_link); 195 196 done: 197 DEBUG_PRINT(TRACE_OBJECTS, ("registered power resource %s\n", acpi_name(res))); 198 out: 199 if (obj != NULL) 200 AcpiOsFree(obj); 201 if ((status != AE_OK) && (rp != NULL)) 202 free(rp, M_ACPIPWR); 203 return_ACPI_STATUS(status); 204} 205 206/* 207 * Deregister a power resource. 208 */ 209static ACPI_STATUS 210acpi_pwr_deregister_resource(ACPI_HANDLE res) 211{ 212 struct acpi_powerresource *rp; 213 214 FUNCTION_TRACE(__func__); 215 216 rp = NULL; 217 218 /* find the resource */ 219 if ((rp = acpi_pwr_find_resource(res)) == NULL) 220 return_ACPI_STATUS(AE_BAD_PARAMETER); 221 222 /* check that there are no consumers referencing this resource */ 223 if (TAILQ_FIRST(&rp->ap_references) != NULL) 224 return_ACPI_STATUS(AE_BAD_PARAMETER); 225 226 /* pull it off the list and free it */ 227 TAILQ_REMOVE(&acpi_powerresources, rp, ap_link); 228 free(rp, M_ACPIPWR); 229 230 DEBUG_PRINT(TRACE_OBJECTS, ("deregistered power resource %s\n", acpi_name(res))); 231 232 return_ACPI_STATUS(AE_OK); 233} 234 235/* 236 * Register a power consumer. 237 * 238 * It's OK to call this if we already know about the consumer. 239 */ 240static ACPI_STATUS 241acpi_pwr_register_consumer(ACPI_HANDLE consumer) 242{ 243 struct acpi_powerconsumer *pc; 244 245 FUNCTION_TRACE(__func__); 246 247 /* check to see whether we know about this consumer already */ 248 if ((pc = acpi_pwr_find_consumer(consumer)) != NULL) 249 return_ACPI_STATUS(AE_OK); 250 251 /* allocate a new power consumer */ 252 if ((pc = malloc(sizeof(*pc), M_ACPIPWR, M_NOWAIT)) == NULL) 253 return_ACPI_STATUS(AE_NO_MEMORY); 254 TAILQ_INSERT_HEAD(&acpi_powerconsumers, pc, ac_link); 255 TAILQ_INIT(&pc->ac_references); 256 pc->ac_consumer = consumer; 257 258 pc->ac_state = ACPI_STATE_UNKNOWN; /* XXX we should try to find its current state */ 259 260 DEBUG_PRINT(TRACE_OBJECTS, ("registered power consumer %s\n", acpi_name(consumer))); 261 262 return_ACPI_STATUS(AE_OK); 263} 264 265/* 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 FUNCTION_TRACE(__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 DEBUG_PRINT(TRACE_OBJECTS, ("deregistered power consumer %s\n", acpi_name(consumer))); 290 291 return_ACPI_STATUS(AE_OK); 292} 293 294/* 295 * Set a power consumer to a particular power state. 296 */ 297ACPI_STATUS 298acpi_pwr_switch_consumer(ACPI_HANDLE consumer, int state) 299{ 300 struct acpi_powerconsumer *pc; 301 struct acpi_powerreference *pr; 302 ACPI_HANDLE method_handle, reslist_handle; 303 ACPI_BUFFER reslist_buffer; 304 ACPI_OBJECT *reslist_object; 305 ACPI_STATUS status; 306 char *method_name, *reslist_name; 307 int res_changed; 308 309 FUNCTION_TRACE(__func__); 310 311 /* find the consumer */ 312 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) { 313 if ((status = acpi_pwr_register_consumer(consumer)) != AE_OK) 314 return_ACPI_STATUS(status); 315 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) { 316 return_ACPI_STATUS(AE_ERROR); /* something very wrong */ 317 } 318 } 319 320 /* check for valid transitions */ 321 if ((pc->ac_state == ACPI_STATE_D3) && (state != ACPI_STATE_D0)) 322 return_ACPI_STATUS(AE_BAD_PARAMETER); /* can only go to D0 from D3 */ 323 324 /* find transition mechanism(s) */ 325 switch(state) { 326 case ACPI_STATE_D0: 327 method_name = "_PS0"; 328 reslist_name = "_PR0"; 329 break; 330 case ACPI_STATE_D1: 331 method_name = "_PS1"; 332 reslist_name = "_PR1"; 333 break; 334 case ACPI_STATE_D2: 335 method_name = "_PS2"; 336 reslist_name = "_PR2"; 337 break; 338 case ACPI_STATE_D3: 339 method_name = "_PS3"; 340 reslist_name = "_PR3"; 341 break; 342 default: 343 return_ACPI_STATUS(AE_BAD_PARAMETER); 344 } 345 DEBUG_PRINT(TRACE_OBJECTS, ("setup to switch %s D%d -> D%d\n", 346 acpi_name(consumer), pc->ac_state, state)); 347 348 /* 349 * Verify that this state is supported, ie. one of method or 350 * reslist must be present. We need to do this before we go 351 * dereferencing resources (since we might be trying to go to 352 * a state we don't support). 353 * 354 * Note that if any states are supported, the device has to 355 * support D0 and D3. It's never an error to try to go to 356 * D0. 357 */ 358 if (AcpiGetHandle(consumer, method_name, &method_handle) != AE_OK) 359 method_handle = NULL; 360 if (AcpiGetHandle(consumer, reslist_name, &reslist_handle) != AE_OK) 361 reslist_handle = NULL; 362 if ((reslist_handle == NULL) && (method_handle == NULL)) { 363 if (state == ACPI_STATE_D0) { 364 pc->ac_state = ACPI_STATE_D0; 365 return_ACPI_STATUS(AE_OK); 366 } 367 DEBUG_PRINT(TRACE_OBJECTS, ("attempt to set unsupported state D%d\n", 368 state)); 369 return_ACPI_STATUS(AE_BAD_PARAMETER); 370 } 371 372 /* 373 * Check that we can actually fetch the list of power resources 374 */ 375 if (reslist_handle != NULL) { 376 if ((status = acpi_EvaluateIntoBuffer(reslist_handle, NULL, NULL, &reslist_buffer)) != AE_OK) { 377 DEBUG_PRINT(TRACE_OBJECTS, ("can't evaluate resource list %s\n", 378 acpi_name(reslist_handle))); 379 return_ACPI_STATUS(status); 380 } 381 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer; 382 if (reslist_object->Type != ACPI_TYPE_PACKAGE) { 383 DEBUG_PRINT(TRACE_OBJECTS, ("resource list is not ACPI_TYPE_PACKAGE (%d)\n", 384 reslist_object->Type)); 385 return_ACPI_STATUS(AE_TYPE); 386 } 387 } else { 388 reslist_object = NULL; 389 } 390 391 /* 392 * Now we are ready to switch, so kill off any current power resource references. 393 */ 394 res_changed = 0; 395 while((pr = TAILQ_FIRST(&pc->ac_references)) != NULL) { 396 res_changed = 1; 397 DEBUG_PRINT(TRACE_OBJECTS, ("removing reference to %s\n", acpi_name(pr->ar_resource->ap_resource))); 398 TAILQ_REMOVE(&pr->ar_resource->ap_references, pr, ar_rlink); 399 TAILQ_REMOVE(&pc->ac_references, pr, ar_clink); 400 free(pr, M_ACPIPWR); 401 } 402 403 /* 404 * Add new power resource references, if we have any. Traverse the 405 * package that we got from evaluating reslist_handle, and look up each 406 * of the resources that are referenced. 407 */ 408 if (reslist_object != NULL) { 409 DEBUG_PRINT(TRACE_OBJECTS, ("referencing %d new resources\n", 410 reslist_object->Package.Count)); 411 acpi_ForeachPackageObject(reslist_object, acpi_pwr_reference_resource, pc); 412 res_changed = 1; 413 } 414 415 /* 416 * If we changed anything in the resource list, we need to run a switch 417 * pass now. 418 */ 419 if ((status = acpi_pwr_switch_power()) != AE_OK) { 420 DEBUG_PRINT(TRACE_OBJECTS, ("failed to correctly switch resources to move %s to D%d\n", 421 acpi_name(consumer), state)); 422 return_ACPI_STATUS(status); /* XXX is this appropriate? Should we return to previous state? */ 423 } 424 425 /* invoke power state switch method (if present) */ 426 if (method_handle != NULL) { 427 DEBUG_PRINT(TRACE_OBJECTS, ("invoking state transition method %s\n", 428 acpi_name(method_handle))); 429 if ((status = AcpiEvaluateObject(method_handle, NULL, NULL, NULL)) != AE_OK) 430 pc->ac_state = ACPI_STATE_UNKNOWN; 431 return_ACPI_STATUS(status); /* XXX is this appropriate? Should we return to previous state? */ 432 } 433 434 /* transition was successful */ 435 pc->ac_state = state; 436 return_ACPI_STATUS(AE_OK); 437} 438 439/* 440 * Called to create a reference between a power consumer and a power resource 441 * identified in the object. 442 */ 443static void 444acpi_pwr_reference_resource(ACPI_OBJECT *obj, void *arg) 445{ 446 struct acpi_powerconsumer *pc = (struct acpi_powerconsumer *)arg; 447 struct acpi_powerreference *pr; 448 struct acpi_powerresource *rp; 449 ACPI_HANDLE res; 450 ACPI_STATUS status; 451 452 FUNCTION_TRACE(__func__); 453 454 /* check the object type */ 455 if (obj->Type != ACPI_TYPE_STRING) { 456 DEBUG_PRINT(TRACE_OBJECTS, ("don't know how to create a power reference to object type %d\n", 457 obj->Type)); 458 return_VOID; 459 } 460 461 DEBUG_PRINT(TRACE_OBJECTS, ("building reference from %s to %s\n", 462 acpi_name(pc->ac_consumer), obj->String.Pointer)); 463 464 /* get the handle of the resource */ 465 if (ACPI_FAILURE(status = AcpiGetHandle(NULL, obj->String.Pointer, &res))) { 466 DEBUG_PRINT(TRACE_OBJECTS, ("couldn't find power resource %s\n", 467 obj->String.Pointer)); 468 return_VOID; 469 } 470 471 /* create/look up the resource */ 472 if (ACPI_FAILURE(status = acpi_pwr_register_resource(res))) { 473 DEBUG_PRINT(TRACE_OBJECTS, ("couldn't register power resource %s - %s\n", 474 obj->String.Pointer, AcpiFormatException(status))); 475 return_VOID; 476 } 477 if ((rp = acpi_pwr_find_resource(res)) == NULL) { 478 DEBUG_PRINT(TRACE_OBJECTS, ("power resource list corrupted\n")); 479 return_VOID; 480 } 481 DEBUG_PRINT(TRACE_OBJECTS, ("found power resource %s\n", acpi_name(rp->ap_resource))); 482 483 /* create a reference between the consumer and resource */ 484 if ((pr = malloc(sizeof(*pr), M_ACPIPWR, M_NOWAIT | M_ZERO)) == NULL) { 485 DEBUG_PRINT(TRACE_OBJECTS, ("couldn't allocate memory for a power consumer reference\n")); 486 return_VOID; 487 } 488 pr->ar_consumer = pc; 489 pr->ar_resource = rp; 490 TAILQ_INSERT_TAIL(&pc->ac_references, pr, ar_clink); 491 TAILQ_INSERT_TAIL(&rp->ap_references, pr, ar_rlink); 492 493 return_VOID; 494} 495 496 497/* 498 * Switch power resources to conform to the desired state. 499 * 500 * Consumers may have modified the power resource list in an arbitrary 501 * fashion; we sweep it in sequence order. 502 */ 503static ACPI_STATUS 504acpi_pwr_switch_power(void) 505{ 506 struct acpi_powerresource *rp; 507 ACPI_STATUS status; 508 int cur; 509 510 FUNCTION_TRACE(__func__); 511 512 /* 513 * Sweep the list forwards turning things on. 514 */ 515 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) { 516 if (TAILQ_FIRST(&rp->ap_references) == NULL) { 517 DEBUG_PRINT(TRACE_OBJECTS, ("%s has no references, not turning on\n", 518 acpi_name(rp->ap_resource))); 519 continue; 520 } 521 522 /* we could cache this if we trusted it not to change under us */ 523 if ((status = acpi_EvaluateInteger(rp->ap_resource, "_STA", &cur)) != AE_OK) { 524 DEBUG_PRINT(TRACE_OBJECTS, ("can't get status of %s - %d\n", 525 acpi_name(rp->ap_resource), status)); 526 continue; /* XXX is this correct? Always switch if in doubt? */ 527 } 528 529 /* 530 * Switch if required. Note that we ignore the result of the switch 531 * effort; we don't know what to do if it fails, so checking wouldn't 532 * help much. 533 */ 534 if (cur != ACPI_PWR_ON) { 535 if (ACPI_FAILURE(status = AcpiEvaluateObject(rp->ap_resource, "_ON", NULL, NULL))) { 536 DEBUG_PRINT(TRACE_OBJECTS, ("failed to switch %s on - %s\n", 537 acpi_name(rp->ap_resource), AcpiFormatException(status))); 538 } else { 539 DEBUG_PRINT(TRACE_OBJECTS, ("switched %s on\n", acpi_name(rp->ap_resource))); 540 } 541 } else { 542 DEBUG_PRINT(TRACE_OBJECTS, ("%s is already on\n", acpi_name(rp->ap_resource))); 543 } 544 } 545 546 /* 547 * Sweep the list backwards turning things off. 548 */ 549 TAILQ_FOREACH_REVERSE(rp, &acpi_powerresources, acpi_powerresource_list, ap_link) { 550 if (TAILQ_FIRST(&rp->ap_references) != NULL) { 551 DEBUG_PRINT(TRACE_OBJECTS, ("%s has references, not turning off\n", 552 acpi_name(rp->ap_resource))); 553 continue; 554 } 555 556 /* we could cache this if we trusted it not to change under us */ 557 if ((status = acpi_EvaluateInteger(rp->ap_resource, "_STA", &cur)) != AE_OK) { 558 DEBUG_PRINT(TRACE_OBJECTS, ("can't get status of %s - %d\n", 559 acpi_name(rp->ap_resource), status)); 560 continue; /* XXX is this correct? Always switch if in doubt? */ 561 } 562 563 /* 564 * Switch if required. Note that we ignore the result of the switch 565 * effort; we don't know what to do if it fails, so checking wouldn't 566 * help much. 567 */ 568 if (cur != ACPI_PWR_OFF) { 569 if (ACPI_FAILURE(status = AcpiEvaluateObject(rp->ap_resource, "_OFF", NULL, NULL))) { 570 DEBUG_PRINT(TRACE_OBJECTS, ("failed to switch %s off - %s\n", 571 acpi_name(rp->ap_resource), AcpiFormatException(status))); 572 } else { 573 DEBUG_PRINT(TRACE_OBJECTS, ("switched %s off\n", acpi_name(rp->ap_resource))); 574 } 575 } else { 576 DEBUG_PRINT(TRACE_OBJECTS, ("%s is already off\n", acpi_name(rp->ap_resource))); 577 } 578 } 579 return_ACPI_STATUS(AE_OK); 580} 581 582/* 583 * Find a power resource's control structure. 584 */ 585static struct acpi_powerresource * 586acpi_pwr_find_resource(ACPI_HANDLE res) 587{ 588 struct acpi_powerresource *rp; 589 590 FUNCTION_TRACE(__func__); 591 592 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) 593 if (rp->ap_resource == res) 594 break; 595 return_VALUE(rp); 596} 597 598/* 599 * Find a power consumer's control structure. 600 */ 601static struct acpi_powerconsumer * 602acpi_pwr_find_consumer(ACPI_HANDLE consumer) 603{ 604 struct acpi_powerconsumer *pc; 605 606 FUNCTION_TRACE(__func__); 607 608 TAILQ_FOREACH(pc, &acpi_powerconsumers, ac_link) 609 if (pc->ac_consumer == consumer) 610 break; 611 return_VALUE(pc); 612} 613 614