1 /****************************************************************************** 2 * 3 * Module Name: evgpeinit - System GPE initialization and update 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2010, Intel Corp. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions, and the following disclaimer, 16 * without modification. 17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 18 * substantially similar to the "NO WARRANTY" disclaimer below 19 * ("Disclaimer") and any redistribution must be conditioned upon 20 * including a substantially similar Disclaimer requirement for further 21 * binary redistribution. 22 * 3. Neither the names of the above-listed copyright holders nor the names 23 * of any contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * Alternatively, this software may be distributed under the terms of the 27 * GNU General Public License ("GPL") version 2 as published by the Free 28 * Software Foundation. 29 * 30 * NO WARRANTY 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 * POSSIBILITY OF SUCH DAMAGES. 42 */ 43 44 #include <acpi/acpi.h> 45 #include "accommon.h" 46 #include "acevents.h" 47 #include "acnamesp.h" 48 #include "acinterp.h" 49 50 #define _COMPONENT ACPI_EVENTS 51 ACPI_MODULE_NAME("evgpeinit") 52 53 /******************************************************************************* 54 * 55 * FUNCTION: acpi_ev_gpe_initialize 56 * 57 * PARAMETERS: None 58 * 59 * RETURN: Status 60 * 61 * DESCRIPTION: Initialize the GPE data structures and the FADT GPE 0/1 blocks 62 * 63 ******************************************************************************/ 64 acpi_status acpi_ev_gpe_initialize(void) 65 { 66 u32 register_count0 = 0; 67 u32 register_count1 = 0; 68 u32 gpe_number_max = 0; 69 acpi_status status; 70 71 ACPI_FUNCTION_TRACE(ev_gpe_initialize); 72 73 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 74 if (ACPI_FAILURE(status)) { 75 return_ACPI_STATUS(status); 76 } 77 78 /* 79 * Initialize the GPE Block(s) defined in the FADT 80 * 81 * Why the GPE register block lengths are divided by 2: From the ACPI 82 * Spec, section "General-Purpose Event Registers", we have: 83 * 84 * "Each register block contains two registers of equal length 85 * GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the 86 * GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN 87 * The length of the GPE1_STS and GPE1_EN registers is equal to 88 * half the GPE1_LEN. If a generic register block is not supported 89 * then its respective block pointer and block length values in the 90 * FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need 91 * to be the same size." 92 */ 93 94 /* 95 * Determine the maximum GPE number for this machine. 96 * 97 * Note: both GPE0 and GPE1 are optional, and either can exist without 98 * the other. 99 * 100 * If EITHER the register length OR the block address are zero, then that 101 * particular block is not supported. 102 */ 103 if (acpi_gbl_FADT.gpe0_block_length && 104 acpi_gbl_FADT.xgpe0_block.address) { 105 106 /* GPE block 0 exists (has both length and address > 0) */ 107 108 register_count0 = (u16)(acpi_gbl_FADT.gpe0_block_length / 2); 109 110 gpe_number_max = 111 (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1; 112 113 /* Install GPE Block 0 */ 114 115 status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device, 116 &acpi_gbl_FADT.xgpe0_block, 117 register_count0, 0, 118 acpi_gbl_FADT.sci_interrupt, 119 &acpi_gbl_gpe_fadt_blocks[0]); 120 121 if (ACPI_FAILURE(status)) { 122 ACPI_EXCEPTION((AE_INFO, status, 123 "Could not create GPE Block 0")); 124 } 125 } 126 127 if (acpi_gbl_FADT.gpe1_block_length && 128 acpi_gbl_FADT.xgpe1_block.address) { 129 130 /* GPE block 1 exists (has both length and address > 0) */ 131 132 register_count1 = (u16)(acpi_gbl_FADT.gpe1_block_length / 2); 133 134 /* Check for GPE0/GPE1 overlap (if both banks exist) */ 135 136 if ((register_count0) && 137 (gpe_number_max >= acpi_gbl_FADT.gpe1_base)) { 138 ACPI_ERROR((AE_INFO, 139 "GPE0 block (GPE 0 to %u) overlaps the GPE1 block " 140 "(GPE %u to %u) - Ignoring GPE1", 141 gpe_number_max, acpi_gbl_FADT.gpe1_base, 142 acpi_gbl_FADT.gpe1_base + 143 ((register_count1 * 144 ACPI_GPE_REGISTER_WIDTH) - 1))); 145 146 /* Ignore GPE1 block by setting the register count to zero */ 147 148 register_count1 = 0; 149 } else { 150 /* Install GPE Block 1 */ 151 152 status = 153 acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device, 154 &acpi_gbl_FADT.xgpe1_block, 155 register_count1, 156 acpi_gbl_FADT.gpe1_base, 157 acpi_gbl_FADT. 158 sci_interrupt, 159 &acpi_gbl_gpe_fadt_blocks 160 [1]); 161 162 if (ACPI_FAILURE(status)) { 163 ACPI_EXCEPTION((AE_INFO, status, 164 "Could not create GPE Block 1")); 165 } 166 167 /* 168 * GPE0 and GPE1 do not have to be contiguous in the GPE number 169 * space. However, GPE0 always starts at GPE number zero. 170 */ 171 gpe_number_max = acpi_gbl_FADT.gpe1_base + 172 ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1); 173 } 174 } 175 176 /* Exit if there are no GPE registers */ 177 178 if ((register_count0 + register_count1) == 0) { 179 180 /* GPEs are not required by ACPI, this is OK */ 181 182 ACPI_DEBUG_PRINT((ACPI_DB_INIT, 183 "There are no GPE blocks defined in the FADT\n")); 184 status = AE_OK; 185 goto cleanup; 186 } 187 188 /* Check for Max GPE number out-of-range */ 189 190 if (gpe_number_max > ACPI_GPE_MAX) { 191 ACPI_ERROR((AE_INFO, 192 "Maximum GPE number from FADT is too large: 0x%X", 193 gpe_number_max)); 194 status = AE_BAD_VALUE; 195 goto cleanup; 196 } 197 198 cleanup: 199 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 200 return_ACPI_STATUS(AE_OK); 201 } 202 203 /******************************************************************************* 204 * 205 * FUNCTION: acpi_ev_update_gpes 206 * 207 * PARAMETERS: table_owner_id - ID of the newly-loaded ACPI table 208 * 209 * RETURN: None 210 * 211 * DESCRIPTION: Check for new GPE methods (_Lxx/_Exx) made available as a 212 * result of a Load() or load_table() operation. If new GPE 213 * methods have been installed, register the new methods and 214 * enable and runtime GPEs that are associated with them. Also, 215 * run any newly loaded _PRW methods in order to discover any 216 * new CAN_WAKE GPEs. 217 * 218 ******************************************************************************/ 219 220 void acpi_ev_update_gpes(acpi_owner_id table_owner_id) 221 { 222 struct acpi_gpe_xrupt_info *gpe_xrupt_info; 223 struct acpi_gpe_block_info *gpe_block; 224 struct acpi_gpe_walk_info walk_info; 225 acpi_status status = AE_OK; 226 u32 new_wake_gpe_count = 0; 227 228 /* We will examine only _PRW/_Lxx/_Exx methods owned by this table */ 229 230 walk_info.owner_id = table_owner_id; 231 walk_info.execute_by_owner_id = TRUE; 232 walk_info.count = 0; 233 234 if (acpi_gbl_leave_wake_gpes_disabled) { 235 /* 236 * 1) Run any newly-loaded _PRW methods to find any GPEs that 237 * can now be marked as CAN_WAKE GPEs. Note: We must run the 238 * _PRW methods before we process the _Lxx/_Exx methods because 239 * we will enable all runtime GPEs associated with the new 240 * _Lxx/_Exx methods at the time we process those methods. 241 * 242 * Unlock interpreter so that we can run the _PRW methods. 243 */ 244 walk_info.gpe_block = NULL; 245 walk_info.gpe_device = NULL; 246 247 acpi_ex_exit_interpreter(); 248 249 status = 250 acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 251 ACPI_UINT32_MAX, 252 ACPI_NS_WALK_NO_UNLOCK, 253 acpi_ev_match_prw_and_gpe, NULL, 254 &walk_info, NULL); 255 if (ACPI_FAILURE(status)) { 256 ACPI_EXCEPTION((AE_INFO, status, 257 "While executing _PRW methods")); 258 } 259 260 acpi_ex_enter_interpreter(); 261 new_wake_gpe_count = walk_info.count; 262 } 263 264 /* 265 * 2) Find any _Lxx/_Exx GPE methods that have just been loaded. 266 * 267 * Any GPEs that correspond to new _Lxx/_Exx methods and are not 268 * marked as CAN_WAKE are immediately enabled. 269 * 270 * Examine the namespace underneath each gpe_device within the 271 * gpe_block lists. 272 */ 273 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); 274 if (ACPI_FAILURE(status)) { 275 return; 276 } 277 278 walk_info.count = 0; 279 walk_info.enable_this_gpe = TRUE; 280 281 /* Walk the interrupt level descriptor list */ 282 283 gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head; 284 while (gpe_xrupt_info) { 285 286 /* Walk all Gpe Blocks attached to this interrupt level */ 287 288 gpe_block = gpe_xrupt_info->gpe_block_list_head; 289 while (gpe_block) { 290 walk_info.gpe_block = gpe_block; 291 walk_info.gpe_device = gpe_block->node; 292 293 status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, 294 walk_info.gpe_device, 295 ACPI_UINT32_MAX, 296 ACPI_NS_WALK_NO_UNLOCK, 297 acpi_ev_match_gpe_method, 298 NULL, &walk_info, NULL); 299 if (ACPI_FAILURE(status)) { 300 ACPI_EXCEPTION((AE_INFO, status, 301 "While decoding _Lxx/_Exx methods")); 302 } 303 304 gpe_block = gpe_block->next; 305 } 306 307 gpe_xrupt_info = gpe_xrupt_info->next; 308 } 309 310 if (walk_info.count || new_wake_gpe_count) { 311 ACPI_INFO((AE_INFO, 312 "Enabled %u new runtime GPEs, added %u new wakeup GPEs", 313 walk_info.count, new_wake_gpe_count)); 314 } 315 316 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); 317 return; 318 } 319 320 /******************************************************************************* 321 * 322 * FUNCTION: acpi_ev_match_gpe_method 323 * 324 * PARAMETERS: Callback from walk_namespace 325 * 326 * RETURN: Status 327 * 328 * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a 329 * control method under the _GPE portion of the namespace. 330 * Extract the name and GPE type from the object, saving this 331 * information for quick lookup during GPE dispatch. Allows a 332 * per-owner_id evaluation if execute_by_owner_id is TRUE in the 333 * walk_info parameter block. 334 * 335 * The name of each GPE control method is of the form: 336 * "_Lxx" or "_Exx", where: 337 * L - means that the GPE is level triggered 338 * E - means that the GPE is edge triggered 339 * xx - is the GPE number [in HEX] 340 * 341 * If walk_info->execute_by_owner_id is TRUE, we only execute examine GPE methods 342 * with that owner. 343 * If walk_info->enable_this_gpe is TRUE, the GPE that is referred to by a GPE 344 * method is immediately enabled (Used for Load/load_table operators) 345 * 346 ******************************************************************************/ 347 348 acpi_status 349 acpi_ev_match_gpe_method(acpi_handle obj_handle, 350 u32 level, void *context, void **return_value) 351 { 352 struct acpi_namespace_node *method_node = 353 ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle); 354 struct acpi_gpe_walk_info *walk_info = 355 ACPI_CAST_PTR(struct acpi_gpe_walk_info, context); 356 struct acpi_gpe_event_info *gpe_event_info; 357 struct acpi_namespace_node *gpe_device; 358 acpi_status status; 359 u32 gpe_number; 360 char name[ACPI_NAME_SIZE + 1]; 361 u8 type; 362 363 ACPI_FUNCTION_TRACE(ev_match_gpe_method); 364 365 /* Check if requested owner_id matches this owner_id */ 366 367 if ((walk_info->execute_by_owner_id) && 368 (method_node->owner_id != walk_info->owner_id)) { 369 return_ACPI_STATUS(AE_OK); 370 } 371 372 /* 373 * Match and decode the _Lxx and _Exx GPE method names 374 * 375 * 1) Extract the method name and null terminate it 376 */ 377 ACPI_MOVE_32_TO_32(name, &method_node->name.integer); 378 name[ACPI_NAME_SIZE] = 0; 379 380 /* 2) Name must begin with an underscore */ 381 382 if (name[0] != '_') { 383 return_ACPI_STATUS(AE_OK); /* Ignore this method */ 384 } 385 386 /* 387 * 3) Edge/Level determination is based on the 2nd character 388 * of the method name 389 * 390 * NOTE: Default GPE type is RUNTIME only. Later, if a _PRW object is 391 * found that points to this GPE, the ACPI_GPE_CAN_WAKE flag is set. 392 */ 393 switch (name[1]) { 394 case 'L': 395 type = ACPI_GPE_LEVEL_TRIGGERED; 396 break; 397 398 case 'E': 399 type = ACPI_GPE_EDGE_TRIGGERED; 400 break; 401 402 default: 403 /* Unknown method type, just ignore it */ 404 405 ACPI_DEBUG_PRINT((ACPI_DB_LOAD, 406 "Ignoring unknown GPE method type: %s " 407 "(name not of form _Lxx or _Exx)", name)); 408 return_ACPI_STATUS(AE_OK); 409 } 410 411 /* 4) The last two characters of the name are the hex GPE Number */ 412 413 gpe_number = ACPI_STRTOUL(&name[2], NULL, 16); 414 if (gpe_number == ACPI_UINT32_MAX) { 415 416 /* Conversion failed; invalid method, just ignore it */ 417 418 ACPI_DEBUG_PRINT((ACPI_DB_LOAD, 419 "Could not extract GPE number from name: %s " 420 "(name is not of form _Lxx or _Exx)", name)); 421 return_ACPI_STATUS(AE_OK); 422 } 423 424 /* Ensure that we have a valid GPE number for this GPE block */ 425 426 gpe_event_info = 427 acpi_ev_low_get_gpe_info(gpe_number, walk_info->gpe_block); 428 if (!gpe_event_info) { 429 /* 430 * This gpe_number is not valid for this GPE block, just ignore it. 431 * However, it may be valid for a different GPE block, since GPE0 432 * and GPE1 methods both appear under \_GPE. 433 */ 434 return_ACPI_STATUS(AE_OK); 435 } 436 437 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) == 438 ACPI_GPE_DISPATCH_HANDLER) { 439 440 /* If there is already a handler, ignore this GPE method */ 441 442 return_ACPI_STATUS(AE_OK); 443 } 444 445 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) == 446 ACPI_GPE_DISPATCH_METHOD) { 447 /* 448 * If there is already a method, ignore this method. But check 449 * for a type mismatch (if both the _Lxx AND _Exx exist) 450 */ 451 if (type != (gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) { 452 ACPI_ERROR((AE_INFO, 453 "For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods", 454 gpe_number, gpe_number, gpe_number)); 455 } 456 return_ACPI_STATUS(AE_OK); 457 } 458 459 /* 460 * Add the GPE information from above to the gpe_event_info block for 461 * use during dispatch of this GPE. 462 */ 463 gpe_event_info->flags |= (u8)(type | ACPI_GPE_DISPATCH_METHOD); 464 gpe_event_info->dispatch.method_node = method_node; 465 466 /* 467 * Enable this GPE if requested. This only happens when during the 468 * execution of a Load or load_table operator. We have found a new 469 * GPE method and want to immediately enable the GPE if it is a 470 * runtime GPE. 471 */ 472 if (walk_info->enable_this_gpe) { 473 474 /* Ignore GPEs that can wake the system */ 475 476 if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE) || 477 !acpi_gbl_leave_wake_gpes_disabled) { 478 walk_info->count++; 479 gpe_device = walk_info->gpe_device; 480 481 if (gpe_device == acpi_gbl_fadt_gpe_device) { 482 gpe_device = NULL; 483 } 484 485 status = acpi_enable_gpe(gpe_device, gpe_number, 486 ACPI_GPE_TYPE_RUNTIME); 487 if (ACPI_FAILURE(status)) { 488 ACPI_EXCEPTION((AE_INFO, status, 489 "Could not enable GPE 0x%02X", 490 gpe_number)); 491 } 492 } 493 } 494 495 ACPI_DEBUG_PRINT((ACPI_DB_LOAD, 496 "Registered GPE method %s as GPE number 0x%.2X\n", 497 name, gpe_number)); 498 return_ACPI_STATUS(AE_OK); 499 } 500 501 /******************************************************************************* 502 * 503 * FUNCTION: acpi_ev_match_prw_and_gpe 504 * 505 * PARAMETERS: Callback from walk_namespace 506 * 507 * RETURN: Status. NOTE: We ignore errors so that the _PRW walk is 508 * not aborted on a single _PRW failure. 509 * 510 * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a 511 * Device. Run the _PRW method. If present, extract the GPE 512 * number and mark the GPE as a CAN_WAKE GPE. Allows a 513 * per-owner_id execution if execute_by_owner_id is TRUE in the 514 * walk_info parameter block. 515 * 516 * If walk_info->execute_by_owner_id is TRUE, we only execute _PRWs with that 517 * owner. 518 * If walk_info->gpe_device is NULL, we execute every _PRW found. Otherwise, 519 * we only execute _PRWs that refer to the input gpe_device. 520 * 521 ******************************************************************************/ 522 523 acpi_status 524 acpi_ev_match_prw_and_gpe(acpi_handle obj_handle, 525 u32 level, void *context, void **return_value) 526 { 527 struct acpi_gpe_walk_info *walk_info = 528 ACPI_CAST_PTR(struct acpi_gpe_walk_info, context); 529 struct acpi_namespace_node *gpe_device; 530 struct acpi_gpe_block_info *gpe_block; 531 struct acpi_namespace_node *target_gpe_device; 532 struct acpi_namespace_node *prw_node; 533 struct acpi_gpe_event_info *gpe_event_info; 534 union acpi_operand_object *pkg_desc; 535 union acpi_operand_object *obj_desc; 536 u32 gpe_number; 537 acpi_status status; 538 539 ACPI_FUNCTION_TRACE(ev_match_prw_and_gpe); 540 541 /* Check for a _PRW method under this device */ 542 543 status = acpi_ns_get_node(obj_handle, METHOD_NAME__PRW, 544 ACPI_NS_NO_UPSEARCH, &prw_node); 545 if (ACPI_FAILURE(status)) { 546 return_ACPI_STATUS(AE_OK); 547 } 548 549 /* Check if requested owner_id matches this owner_id */ 550 551 if ((walk_info->execute_by_owner_id) && 552 (prw_node->owner_id != walk_info->owner_id)) { 553 return_ACPI_STATUS(AE_OK); 554 } 555 556 /* Execute the _PRW */ 557 558 status = acpi_ut_evaluate_object(prw_node, NULL, 559 ACPI_BTYPE_PACKAGE, &pkg_desc); 560 if (ACPI_FAILURE(status)) { 561 return_ACPI_STATUS(AE_OK); 562 } 563 564 /* The returned _PRW package must have at least two elements */ 565 566 if (pkg_desc->package.count < 2) { 567 goto cleanup; 568 } 569 570 /* Extract pointers from the input context */ 571 572 gpe_device = walk_info->gpe_device; 573 gpe_block = walk_info->gpe_block; 574 575 /* 576 * The _PRW object must return a package, we are only interested 577 * in the first element 578 */ 579 obj_desc = pkg_desc->package.elements[0]; 580 581 if (obj_desc->common.type == ACPI_TYPE_INTEGER) { 582 583 /* Use FADT-defined GPE device (from definition of _PRW) */ 584 585 target_gpe_device = NULL; 586 if (gpe_device) { 587 target_gpe_device = acpi_gbl_fadt_gpe_device; 588 } 589 590 /* Integer is the GPE number in the FADT described GPE blocks */ 591 592 gpe_number = (u32)obj_desc->integer.value; 593 } else if (obj_desc->common.type == ACPI_TYPE_PACKAGE) { 594 595 /* Package contains a GPE reference and GPE number within a GPE block */ 596 597 if ((obj_desc->package.count < 2) || 598 ((obj_desc->package.elements[0])->common.type != 599 ACPI_TYPE_LOCAL_REFERENCE) || 600 ((obj_desc->package.elements[1])->common.type != 601 ACPI_TYPE_INTEGER)) { 602 goto cleanup; 603 } 604 605 /* Get GPE block reference and decode */ 606 607 target_gpe_device = 608 obj_desc->package.elements[0]->reference.node; 609 gpe_number = (u32)obj_desc->package.elements[1]->integer.value; 610 } else { 611 /* Unknown type, just ignore it */ 612 613 goto cleanup; 614 } 615 616 /* Get the gpe_event_info for this GPE */ 617 618 if (gpe_device) { 619 /* 620 * Is this GPE within this block? 621 * 622 * TRUE if and only if these conditions are true: 623 * 1) The GPE devices match. 624 * 2) The GPE index(number) is within the range of the Gpe Block 625 * associated with the GPE device. 626 */ 627 if (gpe_device != target_gpe_device) { 628 goto cleanup; 629 } 630 631 gpe_event_info = 632 acpi_ev_low_get_gpe_info(gpe_number, gpe_block); 633 } else { 634 /* gpe_device is NULL, just match the target_device and gpe_number */ 635 636 gpe_event_info = 637 acpi_ev_get_gpe_event_info(target_gpe_device, gpe_number); 638 } 639 640 if (gpe_event_info) { 641 if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) { 642 643 /* This GPE can wake the system */ 644 645 gpe_event_info->flags |= ACPI_GPE_CAN_WAKE; 646 walk_info->count++; 647 } 648 } 649 650 cleanup: 651 acpi_ut_remove_reference(pkg_desc); 652 return_ACPI_STATUS(AE_OK); 653 } 654