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("$FreeBSD$"); 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 <contrib/dev/acpica/include/acpi.h> 37 #include <contrib/dev/acpica/include/accommon.h> 38 39 #include <dev/acpica/acpivar.h> 40 41 /* 42 * ACPI power resource management. 43 * 44 * Power resource behaviour is slightly complicated by the fact that 45 * a single power resource may provide power for more than one device. 46 * Thus, we must track the device(s) being powered by a given power 47 * resource, and only deactivate it when there are no powered devices. 48 * 49 * Note that this only manages resources for known devices. There is an 50 * ugly case where we may turn off power to a device which is in use because 51 * we don't know that it depends on a given resource. We should perhaps 52 * try to be smarter about this, but a more complete solution would involve 53 * scanning all of the ACPI namespace to find devices we're not currently 54 * aware of, and this raises questions about whether they should be left 55 * on, turned off, etc. 56 */ 57 58 static MALLOC_DEFINE(M_ACPIPWR, "acpipwr", "ACPI power resources"); 59 60 /* Hooks for the ACPI CA debugging infrastructure */ 61 #define _COMPONENT ACPI_POWERRES 62 ACPI_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 #define ACPI_PWR_UNK (-1) 68 69 /* A relationship between a power resource and a consumer. */ 70 struct acpi_powerreference { 71 struct acpi_powerconsumer *ar_consumer; 72 struct acpi_powerresource *ar_resource; 73 TAILQ_ENTRY(acpi_powerreference) ar_rlink; /* link on resource list */ 74 TAILQ_ENTRY(acpi_powerreference) ar_clink; /* link on consumer */ 75 }; 76 77 /* A power-managed device. */ 78 struct acpi_powerconsumer { 79 /* Device which is powered */ 80 ACPI_HANDLE ac_consumer; 81 int ac_state; 82 TAILQ_ENTRY(acpi_powerconsumer) ac_link; 83 TAILQ_HEAD(,acpi_powerreference) ac_references; 84 }; 85 86 /* A power resource. */ 87 struct acpi_powerresource { 88 TAILQ_ENTRY(acpi_powerresource) ap_link; 89 TAILQ_HEAD(,acpi_powerreference) ap_references; 90 ACPI_HANDLE ap_resource; 91 UINT64 ap_systemlevel; 92 UINT64 ap_order; 93 int ap_state; 94 }; 95 96 static TAILQ_HEAD(acpi_powerresource_list, acpi_powerresource) 97 acpi_powerresources; 98 static TAILQ_HEAD(acpi_powerconsumer_list, acpi_powerconsumer) 99 acpi_powerconsumers; 100 ACPI_SERIAL_DECL(powerres, "ACPI power resources"); 101 102 static ACPI_STATUS acpi_pwr_register_consumer(ACPI_HANDLE consumer); 103 #ifdef notyet 104 static ACPI_STATUS acpi_pwr_deregister_consumer(ACPI_HANDLE consumer); 105 #endif /* notyet */ 106 static ACPI_STATUS acpi_pwr_register_resource(ACPI_HANDLE res); 107 #ifdef notyet 108 static ACPI_STATUS acpi_pwr_deregister_resource(ACPI_HANDLE res); 109 #endif /* notyet */ 110 static void acpi_pwr_reference_resource(ACPI_OBJECT *obj, 111 void *arg); 112 static int acpi_pwr_dereference_resource(struct acpi_powerconsumer 113 *pc); 114 static ACPI_STATUS acpi_pwr_switch_power(void); 115 static struct acpi_powerresource 116 *acpi_pwr_find_resource(ACPI_HANDLE res); 117 static struct acpi_powerconsumer 118 *acpi_pwr_find_consumer(ACPI_HANDLE consumer); 119 120 /* Initialise our lists. */ 121 static void 122 acpi_pwr_init(void *junk) 123 { 124 TAILQ_INIT(&acpi_powerresources); 125 TAILQ_INIT(&acpi_powerconsumers); 126 } 127 SYSINIT(acpi_powerresource, SI_SUB_TUNABLES, SI_ORDER_ANY, acpi_pwr_init, NULL); 128 129 /* 130 * Register a power resource. 131 * 132 * It's OK to call this if we already know about the resource. 133 */ 134 static ACPI_STATUS 135 acpi_pwr_register_resource(ACPI_HANDLE res) 136 { 137 ACPI_STATUS status; 138 ACPI_BUFFER buf; 139 ACPI_OBJECT *obj; 140 struct acpi_powerresource *rp, *srp; 141 142 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 143 ACPI_SERIAL_ASSERT(powerres); 144 145 rp = NULL; 146 buf.Pointer = NULL; 147 148 /* Look to see if we know about this resource */ 149 if (acpi_pwr_find_resource(res) != NULL) 150 return_ACPI_STATUS (AE_OK); /* already know about it */ 151 152 /* Allocate a new resource */ 153 if ((rp = malloc(sizeof(*rp), M_ACPIPWR, M_NOWAIT | M_ZERO)) == NULL) { 154 status = AE_NO_MEMORY; 155 goto out; 156 } 157 TAILQ_INIT(&rp->ap_references); 158 rp->ap_resource = res; 159 160 /* Get the Power Resource object */ 161 buf.Length = ACPI_ALLOCATE_BUFFER; 162 if (ACPI_FAILURE(status = AcpiEvaluateObject(res, NULL, NULL, &buf))) { 163 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "no power resource object\n")); 164 goto out; 165 } 166 obj = buf.Pointer; 167 if (obj->Type != ACPI_TYPE_POWER) { 168 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 169 "questionable power resource object %s\n", 170 acpi_name(res))); 171 status = AE_TYPE; 172 goto out; 173 } 174 rp->ap_systemlevel = obj->PowerResource.SystemLevel; 175 rp->ap_order = obj->PowerResource.ResourceOrder; 176 rp->ap_state = ACPI_PWR_UNK; 177 178 /* Sort the resource into the list */ 179 status = AE_OK; 180 srp = TAILQ_FIRST(&acpi_powerresources); 181 if (srp == NULL || rp->ap_order < srp->ap_order) { 182 TAILQ_INSERT_HEAD(&acpi_powerresources, rp, ap_link); 183 goto done; 184 } 185 TAILQ_FOREACH(srp, &acpi_powerresources, ap_link) { 186 if (rp->ap_order < srp->ap_order) { 187 TAILQ_INSERT_BEFORE(srp, rp, ap_link); 188 goto done; 189 } 190 } 191 TAILQ_INSERT_TAIL(&acpi_powerresources, rp, ap_link); 192 193 done: 194 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 195 "registered power resource %s\n", acpi_name(res))); 196 197 out: 198 if (buf.Pointer != NULL) 199 AcpiOsFree(buf.Pointer); 200 if (ACPI_FAILURE(status) && rp != NULL) 201 free(rp, M_ACPIPWR); 202 return_ACPI_STATUS (status); 203 } 204 205 #ifdef notyet 206 /* 207 * Deregister a power resource. 208 */ 209 static ACPI_STATUS 210 acpi_pwr_deregister_resource(ACPI_HANDLE res) 211 { 212 struct acpi_powerresource *rp; 213 214 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 215 ACPI_SERIAL_ASSERT(powerres); 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", 232 acpi_name(res))); 233 234 return_ACPI_STATUS (AE_OK); 235 } 236 #endif /* notyet */ 237 238 /* 239 * Register a power consumer. 240 * 241 * It's OK to call this if we already know about the consumer. 242 */ 243 static ACPI_STATUS 244 acpi_pwr_register_consumer(ACPI_HANDLE consumer) 245 { 246 struct acpi_powerconsumer *pc; 247 248 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 249 ACPI_SERIAL_ASSERT(powerres); 250 251 /* Check to see whether we know about this consumer already */ 252 if (acpi_pwr_find_consumer(consumer) != NULL) 253 return_ACPI_STATUS (AE_OK); 254 255 /* Allocate a new power consumer */ 256 if ((pc = malloc(sizeof(*pc), M_ACPIPWR, M_NOWAIT)) == NULL) 257 return_ACPI_STATUS (AE_NO_MEMORY); 258 TAILQ_INSERT_HEAD(&acpi_powerconsumers, pc, ac_link); 259 TAILQ_INIT(&pc->ac_references); 260 pc->ac_consumer = consumer; 261 262 /* XXX we should try to find its current state */ 263 pc->ac_state = ACPI_STATE_UNKNOWN; 264 265 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "registered power consumer %s\n", 266 acpi_name(consumer))); 267 268 return_ACPI_STATUS (AE_OK); 269 } 270 271 #ifdef notyet 272 /* 273 * Deregister a power consumer. 274 * 275 * This should only be done once the consumer has been powered off. 276 * (XXX is this correct? Check once implemented) 277 */ 278 static ACPI_STATUS 279 acpi_pwr_deregister_consumer(ACPI_HANDLE consumer) 280 { 281 struct acpi_powerconsumer *pc; 282 283 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 284 ACPI_SERIAL_ASSERT(powerres); 285 286 /* Find the consumer */ 287 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) 288 return_ACPI_STATUS (AE_BAD_PARAMETER); 289 290 /* Make sure the consumer's not referencing anything right now */ 291 if (TAILQ_FIRST(&pc->ac_references) != NULL) 292 return_ACPI_STATUS (AE_BAD_PARAMETER); 293 294 /* Pull the consumer off the list and free it */ 295 TAILQ_REMOVE(&acpi_powerconsumers, pc, ac_link); 296 free(pc, M_ACPIPWR); 297 298 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "deregistered power consumer %s\n", 299 acpi_name(consumer))); 300 301 return_ACPI_STATUS (AE_OK); 302 } 303 #endif /* notyet */ 304 305 /* 306 * Set a power consumer to a particular power state. 307 */ 308 ACPI_STATUS 309 acpi_pwr_switch_consumer(ACPI_HANDLE consumer, int state) 310 { 311 struct acpi_powerconsumer *pc; 312 ACPI_HANDLE method_handle, reslist_handle, pr0_handle; 313 ACPI_BUFFER reslist_buffer; 314 ACPI_OBJECT *reslist_object; 315 ACPI_STATUS status; 316 char *method_name, *reslist_name; 317 318 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 319 320 /* It's never ok to switch a non-existent consumer. */ 321 if (consumer == NULL) 322 return_ACPI_STATUS (AE_NOT_FOUND); 323 reslist_buffer.Pointer = NULL; 324 reslist_object = NULL; 325 ACPI_SERIAL_BEGIN(powerres); 326 327 /* Find the consumer */ 328 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) { 329 if (ACPI_FAILURE(status = acpi_pwr_register_consumer(consumer))) 330 goto out; 331 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) 332 panic("acpi added power consumer but can't find it"); 333 } 334 335 /* Check for valid transitions. We can only go to D0 from D3. */ 336 status = AE_BAD_PARAMETER; 337 if (pc->ac_state == ACPI_STATE_D3 && state != ACPI_STATE_D0) 338 goto out; 339 340 /* Find transition mechanism(s) */ 341 switch (state) { 342 case ACPI_STATE_D0: 343 method_name = "_PS0"; 344 reslist_name = "_PR0"; 345 break; 346 case ACPI_STATE_D1: 347 method_name = "_PS1"; 348 reslist_name = "_PR1"; 349 break; 350 case ACPI_STATE_D2: 351 method_name = "_PS2"; 352 reslist_name = "_PR2"; 353 break; 354 case ACPI_STATE_D3: 355 method_name = "_PS3"; 356 reslist_name = "_PR3"; 357 break; 358 default: 359 goto out; 360 } 361 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "setup to switch %s D%d -> D%d\n", 362 acpi_name(consumer), pc->ac_state, state)); 363 364 /* 365 * Verify that this state is supported, ie. one of method or 366 * reslist must be present. We need to do this before we go 367 * dereferencing resources (since we might be trying to go to 368 * a state we don't support). 369 * 370 * Note that if any states are supported, the device has to 371 * support D0 and D3. It's never an error to try to go to 372 * D0. 373 */ 374 if (ACPI_FAILURE(AcpiGetHandle(consumer, method_name, &method_handle))) 375 method_handle = NULL; 376 if (ACPI_FAILURE(AcpiGetHandle(consumer, reslist_name, &reslist_handle))) 377 reslist_handle = NULL; 378 if (reslist_handle == NULL && method_handle == NULL) { 379 if (state == ACPI_STATE_D0) { 380 pc->ac_state = ACPI_STATE_D0; 381 status = AE_OK; 382 goto out; 383 } 384 if (state != ACPI_STATE_D3) { 385 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 386 "attempt to set unsupported state D%d\n", state)); 387 goto out; 388 } 389 390 /* 391 * Turn off the resources listed in _PR0 to go to D3. If there is 392 * no _PR0 method, this object doesn't support ACPI power states. 393 */ 394 if (ACPI_FAILURE(AcpiGetHandle(consumer, "_PR0", &pr0_handle))) { 395 status = AE_NOT_FOUND; 396 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 397 "device missing _PR0 (desired state was D%d)\n", state)); 398 goto out; 399 } 400 reslist_buffer.Length = ACPI_ALLOCATE_BUFFER; 401 status = AcpiEvaluateObject(pr0_handle, NULL, NULL, &reslist_buffer); 402 if (ACPI_FAILURE(status)) { 403 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 404 "can't evaluate _PR0 for device %s, state D%d\n", 405 acpi_name(consumer), state)); 406 goto out; 407 } 408 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer; 409 if (!ACPI_PKG_VALID(reslist_object, 1)) { 410 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 411 "invalid package object for state D%d\n", state)); 412 status = AE_TYPE; 413 goto out; 414 } 415 AcpiOsFree(reslist_buffer.Pointer); 416 reslist_buffer.Pointer = NULL; 417 reslist_object = NULL; 418 } 419 420 /* 421 * Check that we can actually fetch the list of power resources 422 */ 423 if (reslist_handle != NULL) { 424 reslist_buffer.Length = ACPI_ALLOCATE_BUFFER; 425 status = AcpiEvaluateObject(reslist_handle, NULL, NULL, 426 &reslist_buffer); 427 if (ACPI_FAILURE(status)) { 428 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 429 "can't evaluate resource list %s\n", 430 acpi_name(reslist_handle))); 431 goto out; 432 } 433 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer; 434 if (reslist_object->Type != ACPI_TYPE_PACKAGE) { 435 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 436 "resource list is not ACPI_TYPE_PACKAGE (%d)\n", 437 reslist_object->Type)); 438 status = AE_TYPE; 439 goto out; 440 } 441 } 442 443 /* 444 * Now we are ready to switch, so kill off any current power 445 * resource references. 446 */ 447 acpi_pwr_dereference_resource(pc); 448 449 /* 450 * Add new power resource references, if we have any. Traverse the 451 * package that we got from evaluating reslist_handle, and look up each 452 * of the resources that are referenced. 453 */ 454 if (reslist_object != NULL) { 455 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "referencing %d new resources\n", 456 reslist_object->Package.Count)); 457 acpi_ForeachPackageObject(reslist_object, acpi_pwr_reference_resource, 458 pc); 459 } 460 461 /* 462 * If we changed anything in the resource list, we need to run a switch 463 * pass now. 464 */ 465 if (ACPI_FAILURE(status = acpi_pwr_switch_power())) { 466 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 467 "failed to switch resources from %s to D%d\n", 468 acpi_name(consumer), state)); 469 470 /* XXX is this appropriate? Should we return to previous state? */ 471 goto out; 472 } 473 474 /* Invoke power state switch method (if present) */ 475 if (method_handle != NULL) { 476 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 477 "invoking state transition method %s\n", 478 acpi_name(method_handle))); 479 status = AcpiEvaluateObject(method_handle, NULL, NULL, NULL); 480 if (ACPI_FAILURE(status)) { 481 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "failed to set state - %s\n", 482 AcpiFormatException(status))); 483 pc->ac_state = ACPI_STATE_UNKNOWN; 484 485 /* XXX Should we return to previous state? */ 486 goto out; 487 } 488 } 489 490 /* Transition was successful */ 491 pc->ac_state = state; 492 status = AE_OK; 493 494 out: 495 ACPI_SERIAL_END(powerres); 496 if (reslist_buffer.Pointer != NULL) 497 AcpiOsFree(reslist_buffer.Pointer); 498 return_ACPI_STATUS (status); 499 } 500 501 /* Enable or disable a power resource for wake */ 502 ACPI_STATUS 503 acpi_pwr_wake_enable(ACPI_HANDLE consumer, int enable) 504 { 505 ACPI_STATUS status; 506 struct acpi_powerconsumer *pc; 507 struct acpi_prw_data prw; 508 int i; 509 510 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 511 512 if (consumer == NULL) 513 return (AE_BAD_PARAMETER); 514 515 ACPI_SERIAL_BEGIN(powerres); 516 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) { 517 if (ACPI_FAILURE(status = acpi_pwr_register_consumer(consumer))) 518 goto out; 519 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) 520 panic("acpi wake added power consumer but can't find it"); 521 } 522 523 status = AE_OK; 524 if (acpi_parse_prw(consumer, &prw) != 0) 525 goto out; 526 for (i = 0; i < prw.power_res_count; i++) 527 if (enable) 528 acpi_pwr_reference_resource(&prw.power_res[i], pc); 529 else 530 acpi_pwr_dereference_resource(pc); 531 532 if (prw.power_res_count > 0) 533 acpi_pwr_switch_power(); 534 535 out: 536 ACPI_SERIAL_END(powerres); 537 return (status); 538 } 539 540 /* 541 * Called to create a reference between a power consumer and a power resource 542 * identified in the object. 543 */ 544 static void 545 acpi_pwr_reference_resource(ACPI_OBJECT *obj, void *arg) 546 { 547 struct acpi_powerconsumer *pc = (struct acpi_powerconsumer *)arg; 548 struct acpi_powerreference *pr; 549 struct acpi_powerresource *rp; 550 ACPI_HANDLE res; 551 ACPI_STATUS status; 552 553 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 554 ACPI_SERIAL_ASSERT(powerres); 555 556 res = acpi_GetReference(NULL, obj); 557 if (res == NULL) { 558 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 559 "can't create a power reference for object type %d\n", 560 obj->Type)); 561 return_VOID; 562 } 563 564 /* Create/look up the resource */ 565 if (ACPI_FAILURE(status = acpi_pwr_register_resource(res))) { 566 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 567 "couldn't register power resource %s - %s\n", 568 obj->String.Pointer, AcpiFormatException(status))); 569 return_VOID; 570 } 571 if ((rp = acpi_pwr_find_resource(res)) == NULL) { 572 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "power resource list corrupted\n")); 573 return_VOID; 574 } 575 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "found power resource %s\n", 576 acpi_name(rp->ap_resource))); 577 578 /* Create a reference between the consumer and resource */ 579 if ((pr = malloc(sizeof(*pr), M_ACPIPWR, M_NOWAIT | M_ZERO)) == NULL) { 580 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 581 "allocation failed for a power consumer reference\n")); 582 return_VOID; 583 } 584 pr->ar_consumer = pc; 585 pr->ar_resource = rp; 586 TAILQ_INSERT_TAIL(&pc->ac_references, pr, ar_clink); 587 TAILQ_INSERT_TAIL(&rp->ap_references, pr, ar_rlink); 588 589 return_VOID; 590 } 591 592 static int 593 acpi_pwr_dereference_resource(struct acpi_powerconsumer *pc) 594 { 595 struct acpi_powerreference *pr; 596 int changed; 597 598 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 599 ACPI_SERIAL_ASSERT(powerres); 600 601 changed = 0; 602 while ((pr = TAILQ_FIRST(&pc->ac_references)) != NULL) { 603 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "removing reference to %s\n", 604 acpi_name(pr->ar_resource->ap_resource))); 605 TAILQ_REMOVE(&pr->ar_resource->ap_references, pr, ar_rlink); 606 TAILQ_REMOVE(&pc->ac_references, pr, ar_clink); 607 free(pr, M_ACPIPWR); 608 changed = 1; 609 } 610 611 return (changed); 612 } 613 614 /* 615 * Switch power resources to conform to the desired state. 616 * 617 * Consumers may have modified the power resource list in an arbitrary 618 * fashion; we sweep it in sequence order. 619 */ 620 static ACPI_STATUS 621 acpi_pwr_switch_power(void) 622 { 623 struct acpi_powerresource *rp; 624 ACPI_STATUS status; 625 int cur; 626 627 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 628 ACPI_SERIAL_ASSERT(powerres); 629 630 /* 631 * Sweep the list forwards turning things on. 632 */ 633 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) { 634 if (TAILQ_FIRST(&rp->ap_references) == NULL) { 635 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 636 "%s has no references, not turning on\n", 637 acpi_name(rp->ap_resource))); 638 continue; 639 } 640 641 /* We could cache this if we trusted it not to change under us */ 642 status = acpi_GetInteger(rp->ap_resource, "_STA", &cur); 643 if (ACPI_FAILURE(status)) { 644 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n", 645 acpi_name(rp->ap_resource), status)); 646 /* XXX is this correct? Always switch if in doubt? */ 647 continue; 648 } else if (rp->ap_state == ACPI_PWR_UNK) 649 rp->ap_state = cur; 650 651 /* 652 * Switch if required. Note that we ignore the result of the switch 653 * effort; we don't know what to do if it fails, so checking wouldn't 654 * help much. 655 */ 656 if (rp->ap_state != ACPI_PWR_ON) { 657 status = AcpiEvaluateObject(rp->ap_resource, "_ON", NULL, NULL); 658 if (ACPI_FAILURE(status)) { 659 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 660 "failed to switch %s on - %s\n", 661 acpi_name(rp->ap_resource), 662 AcpiFormatException(status))); 663 } else { 664 rp->ap_state = ACPI_PWR_ON; 665 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s on\n", 666 acpi_name(rp->ap_resource))); 667 } 668 } else { 669 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already on\n", 670 acpi_name(rp->ap_resource))); 671 } 672 } 673 674 /* Sweep the list backwards turning things off. */ 675 TAILQ_FOREACH_REVERSE(rp, &acpi_powerresources, acpi_powerresource_list, 676 ap_link) { 677 678 if (TAILQ_FIRST(&rp->ap_references) != NULL) { 679 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 680 "%s has references, not turning off\n", 681 acpi_name(rp->ap_resource))); 682 continue; 683 } 684 685 /* We could cache this if we trusted it not to change under us */ 686 status = acpi_GetInteger(rp->ap_resource, "_STA", &cur); 687 if (ACPI_FAILURE(status)) { 688 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n", 689 acpi_name(rp->ap_resource), status)); 690 /* XXX is this correct? Always switch if in doubt? */ 691 continue; 692 } else if (rp->ap_state == ACPI_PWR_UNK) 693 rp->ap_state = cur; 694 695 /* 696 * Switch if required. Note that we ignore the result of the switch 697 * effort; we don't know what to do if it fails, so checking wouldn't 698 * help much. 699 */ 700 if (rp->ap_state != ACPI_PWR_OFF) { 701 status = AcpiEvaluateObject(rp->ap_resource, "_OFF", NULL, NULL); 702 if (ACPI_FAILURE(status)) { 703 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, 704 "failed to switch %s off - %s\n", 705 acpi_name(rp->ap_resource), 706 AcpiFormatException(status))); 707 } else { 708 rp->ap_state = ACPI_PWR_OFF; 709 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s off\n", 710 acpi_name(rp->ap_resource))); 711 } 712 } else { 713 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already off\n", 714 acpi_name(rp->ap_resource))); 715 } 716 } 717 718 return_ACPI_STATUS (AE_OK); 719 } 720 721 /* 722 * Find a power resource's control structure. 723 */ 724 static struct acpi_powerresource * 725 acpi_pwr_find_resource(ACPI_HANDLE res) 726 { 727 struct acpi_powerresource *rp; 728 729 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 730 ACPI_SERIAL_ASSERT(powerres); 731 732 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) { 733 if (rp->ap_resource == res) 734 break; 735 } 736 737 return_PTR (rp); 738 } 739 740 /* 741 * Find a power consumer's control structure. 742 */ 743 static struct acpi_powerconsumer * 744 acpi_pwr_find_consumer(ACPI_HANDLE consumer) 745 { 746 struct acpi_powerconsumer *pc; 747 748 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 749 ACPI_SERIAL_ASSERT(powerres); 750 751 TAILQ_FOREACH(pc, &acpi_powerconsumers, ac_link) { 752 if (pc->ac_consumer == consumer) 753 break; 754 } 755 756 return_PTR (pc); 757 } 758