1 /****************************************************************************** 2 * 3 * Module Name: evgpe - General Purpose Event handling and dispatch 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2015, 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 49 #define _COMPONENT ACPI_EVENTS 50 ACPI_MODULE_NAME("evgpe") 51 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ 52 /* Local prototypes */ 53 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context); 54 55 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context); 56 57 /******************************************************************************* 58 * 59 * FUNCTION: acpi_ev_update_gpe_enable_mask 60 * 61 * PARAMETERS: gpe_event_info - GPE to update 62 * 63 * RETURN: Status 64 * 65 * DESCRIPTION: Updates GPE register enable mask based upon whether there are 66 * runtime references to this GPE 67 * 68 ******************************************************************************/ 69 70 acpi_status 71 acpi_ev_update_gpe_enable_mask(struct acpi_gpe_event_info *gpe_event_info) 72 { 73 struct acpi_gpe_register_info *gpe_register_info; 74 u32 register_bit; 75 76 ACPI_FUNCTION_TRACE(ev_update_gpe_enable_mask); 77 78 gpe_register_info = gpe_event_info->register_info; 79 if (!gpe_register_info) { 80 return_ACPI_STATUS(AE_NOT_EXIST); 81 } 82 83 register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info); 84 85 /* Clear the run bit up front */ 86 87 ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit); 88 89 /* Set the mask bit only if there are references to this GPE */ 90 91 if (gpe_event_info->runtime_count) { 92 ACPI_SET_BIT(gpe_register_info->enable_for_run, 93 (u8)register_bit); 94 } 95 96 return_ACPI_STATUS(AE_OK); 97 } 98 99 /******************************************************************************* 100 * 101 * FUNCTION: acpi_ev_enable_gpe 102 * 103 * PARAMETERS: gpe_event_info - GPE to enable 104 * 105 * RETURN: Status 106 * 107 * DESCRIPTION: Clear a GPE of stale events and enable it. 108 * 109 ******************************************************************************/ 110 111 acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info) 112 { 113 acpi_status status; 114 115 ACPI_FUNCTION_TRACE(ev_enable_gpe); 116 117 /* Clear the GPE (of stale events) */ 118 119 status = acpi_hw_clear_gpe(gpe_event_info); 120 if (ACPI_FAILURE(status)) { 121 return_ACPI_STATUS(status); 122 } 123 124 /* Enable the requested GPE */ 125 126 status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE_SAVE); 127 return_ACPI_STATUS(status); 128 } 129 130 /******************************************************************************* 131 * 132 * FUNCTION: acpi_ev_add_gpe_reference 133 * 134 * PARAMETERS: gpe_event_info - Add a reference to this GPE 135 * 136 * RETURN: Status 137 * 138 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is 139 * hardware-enabled. 140 * 141 ******************************************************************************/ 142 143 acpi_status 144 acpi_ev_add_gpe_reference(struct acpi_gpe_event_info *gpe_event_info) 145 { 146 acpi_status status = AE_OK; 147 148 ACPI_FUNCTION_TRACE(ev_add_gpe_reference); 149 150 if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) { 151 return_ACPI_STATUS(AE_LIMIT); 152 } 153 154 gpe_event_info->runtime_count++; 155 if (gpe_event_info->runtime_count == 1) { 156 157 /* Enable on first reference */ 158 159 status = acpi_ev_update_gpe_enable_mask(gpe_event_info); 160 if (ACPI_SUCCESS(status)) { 161 status = acpi_ev_enable_gpe(gpe_event_info); 162 } 163 164 if (ACPI_FAILURE(status)) { 165 gpe_event_info->runtime_count--; 166 } 167 } 168 169 return_ACPI_STATUS(status); 170 } 171 172 /******************************************************************************* 173 * 174 * FUNCTION: acpi_ev_remove_gpe_reference 175 * 176 * PARAMETERS: gpe_event_info - Remove a reference to this GPE 177 * 178 * RETURN: Status 179 * 180 * DESCRIPTION: Remove a reference to a GPE. When the last reference is 181 * removed, the GPE is hardware-disabled. 182 * 183 ******************************************************************************/ 184 185 acpi_status 186 acpi_ev_remove_gpe_reference(struct acpi_gpe_event_info *gpe_event_info) 187 { 188 acpi_status status = AE_OK; 189 190 ACPI_FUNCTION_TRACE(ev_remove_gpe_reference); 191 192 if (!gpe_event_info->runtime_count) { 193 return_ACPI_STATUS(AE_LIMIT); 194 } 195 196 gpe_event_info->runtime_count--; 197 if (!gpe_event_info->runtime_count) { 198 199 /* Disable on last reference */ 200 201 status = acpi_ev_update_gpe_enable_mask(gpe_event_info); 202 if (ACPI_SUCCESS(status)) { 203 status = 204 acpi_hw_low_set_gpe(gpe_event_info, 205 ACPI_GPE_DISABLE_SAVE); 206 } 207 208 if (ACPI_FAILURE(status)) { 209 gpe_event_info->runtime_count++; 210 } 211 } 212 213 return_ACPI_STATUS(status); 214 } 215 216 /******************************************************************************* 217 * 218 * FUNCTION: acpi_ev_low_get_gpe_info 219 * 220 * PARAMETERS: gpe_number - Raw GPE number 221 * gpe_block - A GPE info block 222 * 223 * RETURN: A GPE event_info struct. NULL if not a valid GPE (The gpe_number 224 * is not within the specified GPE block) 225 * 226 * DESCRIPTION: Returns the event_info struct associated with this GPE. This is 227 * the low-level implementation of ev_get_gpe_event_info. 228 * 229 ******************************************************************************/ 230 231 struct acpi_gpe_event_info *acpi_ev_low_get_gpe_info(u32 gpe_number, 232 struct acpi_gpe_block_info 233 *gpe_block) 234 { 235 u32 gpe_index; 236 237 /* 238 * Validate that the gpe_number is within the specified gpe_block. 239 * (Two steps) 240 */ 241 if (!gpe_block || (gpe_number < gpe_block->block_base_number)) { 242 return (NULL); 243 } 244 245 gpe_index = gpe_number - gpe_block->block_base_number; 246 if (gpe_index >= gpe_block->gpe_count) { 247 return (NULL); 248 } 249 250 return (&gpe_block->event_info[gpe_index]); 251 } 252 253 254 /******************************************************************************* 255 * 256 * FUNCTION: acpi_ev_get_gpe_event_info 257 * 258 * PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1 259 * gpe_number - Raw GPE number 260 * 261 * RETURN: A GPE event_info struct. NULL if not a valid GPE 262 * 263 * DESCRIPTION: Returns the event_info struct associated with this GPE. 264 * Validates the gpe_block and the gpe_number 265 * 266 * Should be called only when the GPE lists are semaphore locked 267 * and not subject to change. 268 * 269 ******************************************************************************/ 270 271 struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device, 272 u32 gpe_number) 273 { 274 union acpi_operand_object *obj_desc; 275 struct acpi_gpe_event_info *gpe_info; 276 u32 i; 277 278 ACPI_FUNCTION_ENTRY(); 279 280 /* A NULL gpe_device means use the FADT-defined GPE block(s) */ 281 282 if (!gpe_device) { 283 284 /* Examine GPE Block 0 and 1 (These blocks are permanent) */ 285 286 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) { 287 gpe_info = acpi_ev_low_get_gpe_info(gpe_number, 288 acpi_gbl_gpe_fadt_blocks 289 [i]); 290 if (gpe_info) { 291 return (gpe_info); 292 } 293 } 294 295 /* The gpe_number was not in the range of either FADT GPE block */ 296 297 return (NULL); 298 } 299 300 /* A Non-NULL gpe_device means this is a GPE Block Device */ 301 302 obj_desc = 303 acpi_ns_get_attached_object((struct acpi_namespace_node *) 304 gpe_device); 305 if (!obj_desc || !obj_desc->device.gpe_block) { 306 return (NULL); 307 } 308 309 return (acpi_ev_low_get_gpe_info 310 (gpe_number, obj_desc->device.gpe_block)); 311 } 312 313 /******************************************************************************* 314 * 315 * FUNCTION: acpi_ev_gpe_detect 316 * 317 * PARAMETERS: gpe_xrupt_list - Interrupt block for this interrupt. 318 * Can have multiple GPE blocks attached. 319 * 320 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED 321 * 322 * DESCRIPTION: Detect if any GP events have occurred. This function is 323 * executed at interrupt level. 324 * 325 ******************************************************************************/ 326 327 u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info *gpe_xrupt_list) 328 { 329 acpi_status status; 330 struct acpi_gpe_block_info *gpe_block; 331 struct acpi_namespace_node *gpe_device; 332 struct acpi_gpe_register_info *gpe_register_info; 333 struct acpi_gpe_event_info *gpe_event_info; 334 u32 gpe_number; 335 struct acpi_gpe_handler_info *gpe_handler_info; 336 u32 int_status = ACPI_INTERRUPT_NOT_HANDLED; 337 u8 enabled_status_byte; 338 u32 status_reg; 339 u32 enable_reg; 340 acpi_cpu_flags flags; 341 u32 i; 342 u32 j; 343 344 ACPI_FUNCTION_NAME(ev_gpe_detect); 345 346 /* Check for the case where there are no GPEs */ 347 348 if (!gpe_xrupt_list) { 349 return (int_status); 350 } 351 352 /* 353 * We need to obtain the GPE lock for both the data structs and registers 354 * Note: Not necessary to obtain the hardware lock, since the GPE 355 * registers are owned by the gpe_lock. 356 */ 357 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); 358 359 /* Examine all GPE blocks attached to this interrupt level */ 360 361 gpe_block = gpe_xrupt_list->gpe_block_list_head; 362 while (gpe_block) { 363 gpe_device = gpe_block->node; 364 365 /* 366 * Read all of the 8-bit GPE status and enable registers in this GPE 367 * block, saving all of them. Find all currently active GP events. 368 */ 369 for (i = 0; i < gpe_block->register_count; i++) { 370 371 /* Get the next status/enable pair */ 372 373 gpe_register_info = &gpe_block->register_info[i]; 374 375 /* 376 * Optimization: If there are no GPEs enabled within this 377 * register, we can safely ignore the entire register. 378 */ 379 if (!(gpe_register_info->enable_for_run | 380 gpe_register_info->enable_for_wake)) { 381 ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS, 382 "Ignore disabled registers for GPE %02X-%02X: " 383 "RunEnable=%02X, WakeEnable=%02X\n", 384 gpe_register_info-> 385 base_gpe_number, 386 gpe_register_info-> 387 base_gpe_number + 388 (ACPI_GPE_REGISTER_WIDTH - 1), 389 gpe_register_info-> 390 enable_for_run, 391 gpe_register_info-> 392 enable_for_wake)); 393 continue; 394 } 395 396 /* Read the Status Register */ 397 398 status = 399 acpi_hw_read(&status_reg, 400 &gpe_register_info->status_address); 401 if (ACPI_FAILURE(status)) { 402 goto unlock_and_exit; 403 } 404 405 /* Read the Enable Register */ 406 407 status = 408 acpi_hw_read(&enable_reg, 409 &gpe_register_info->enable_address); 410 if (ACPI_FAILURE(status)) { 411 goto unlock_and_exit; 412 } 413 414 ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS, 415 "Read registers for GPE %02X-%02X: Status=%02X, Enable=%02X, " 416 "RunEnable=%02X, WakeEnable=%02X\n", 417 gpe_register_info->base_gpe_number, 418 gpe_register_info->base_gpe_number + 419 (ACPI_GPE_REGISTER_WIDTH - 1), 420 status_reg, enable_reg, 421 gpe_register_info->enable_for_run, 422 gpe_register_info->enable_for_wake)); 423 424 /* Check if there is anything active at all in this register */ 425 426 enabled_status_byte = (u8)(status_reg & enable_reg); 427 if (!enabled_status_byte) { 428 429 /* No active GPEs in this register, move on */ 430 431 continue; 432 } 433 434 /* Now look at the individual GPEs in this byte register */ 435 436 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) { 437 438 /* Examine one GPE bit */ 439 440 gpe_event_info = 441 &gpe_block-> 442 event_info[((acpi_size) i * 443 ACPI_GPE_REGISTER_WIDTH) + j]; 444 gpe_number = 445 j + gpe_register_info->base_gpe_number; 446 447 if (enabled_status_byte & (1 << j)) { 448 449 /* Invoke global event handler if present */ 450 451 acpi_gpe_count++; 452 if (acpi_gbl_global_event_handler) { 453 acpi_gbl_global_event_handler 454 (ACPI_EVENT_TYPE_GPE, 455 gpe_device, gpe_number, 456 acpi_gbl_global_event_handler_context); 457 } 458 459 /* Found an active GPE */ 460 461 if (ACPI_GPE_DISPATCH_TYPE 462 (gpe_event_info->flags) == 463 ACPI_GPE_DISPATCH_RAW_HANDLER) { 464 465 /* Dispatch the event to a raw handler */ 466 467 gpe_handler_info = 468 gpe_event_info->dispatch. 469 handler; 470 471 /* 472 * There is no protection around the namespace node 473 * and the GPE handler to ensure a safe destruction 474 * because: 475 * 1. The namespace node is expected to always 476 * exist after loading a table. 477 * 2. The GPE handler is expected to be flushed by 478 * acpi_os_wait_events_complete() before the 479 * destruction. 480 */ 481 acpi_os_release_lock 482 (acpi_gbl_gpe_lock, flags); 483 int_status |= 484 gpe_handler_info-> 485 address(gpe_device, 486 gpe_number, 487 gpe_handler_info-> 488 context); 489 flags = 490 acpi_os_acquire_lock 491 (acpi_gbl_gpe_lock); 492 } else { 493 /* 494 * Dispatch the event to a standard handler or 495 * method. 496 */ 497 int_status |= 498 acpi_ev_gpe_dispatch 499 (gpe_device, gpe_event_info, 500 gpe_number); 501 } 502 } 503 } 504 } 505 506 gpe_block = gpe_block->next; 507 } 508 509 unlock_and_exit: 510 511 acpi_os_release_lock(acpi_gbl_gpe_lock, flags); 512 return (int_status); 513 } 514 515 /******************************************************************************* 516 * 517 * FUNCTION: acpi_ev_asynch_execute_gpe_method 518 * 519 * PARAMETERS: Context (gpe_event_info) - Info for this GPE 520 * 521 * RETURN: None 522 * 523 * DESCRIPTION: Perform the actual execution of a GPE control method. This 524 * function is called from an invocation of acpi_os_execute and 525 * therefore does NOT execute at interrupt level - so that 526 * the control method itself is not executed in the context of 527 * an interrupt handler. 528 * 529 ******************************************************************************/ 530 531 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context) 532 { 533 struct acpi_gpe_event_info *gpe_event_info = context; 534 acpi_status status = AE_OK; 535 struct acpi_evaluate_info *info; 536 struct acpi_gpe_notify_info *notify; 537 538 ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method); 539 540 /* Do the correct dispatch - normal method or implicit notify */ 541 542 switch (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)) { 543 case ACPI_GPE_DISPATCH_NOTIFY: 544 /* 545 * Implicit notify. 546 * Dispatch a DEVICE_WAKE notify to the appropriate handler. 547 * NOTE: the request is queued for execution after this method 548 * completes. The notify handlers are NOT invoked synchronously 549 * from this thread -- because handlers may in turn run other 550 * control methods. 551 * 552 * June 2012: Expand implicit notify mechanism to support 553 * notifies on multiple device objects. 554 */ 555 notify = gpe_event_info->dispatch.notify_list; 556 while (ACPI_SUCCESS(status) && notify) { 557 status = 558 acpi_ev_queue_notify_request(notify->device_node, 559 ACPI_NOTIFY_DEVICE_WAKE); 560 561 notify = notify->next; 562 } 563 564 break; 565 566 case ACPI_GPE_DISPATCH_METHOD: 567 568 /* Allocate the evaluation information block */ 569 570 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); 571 if (!info) { 572 status = AE_NO_MEMORY; 573 } else { 574 /* 575 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the 576 * _Lxx/_Exx control method that corresponds to this GPE 577 */ 578 info->prefix_node = 579 gpe_event_info->dispatch.method_node; 580 info->flags = ACPI_IGNORE_RETURN_VALUE; 581 582 status = acpi_ns_evaluate(info); 583 ACPI_FREE(info); 584 } 585 586 if (ACPI_FAILURE(status)) { 587 ACPI_EXCEPTION((AE_INFO, status, 588 "while evaluating GPE method [%4.4s]", 589 acpi_ut_get_node_name(gpe_event_info-> 590 dispatch. 591 method_node))); 592 } 593 break; 594 595 default: 596 597 goto error_exit; /* Should never happen */ 598 } 599 600 /* Defer enabling of GPE until all notify handlers are done */ 601 602 status = acpi_os_execute(OSL_NOTIFY_HANDLER, 603 acpi_ev_asynch_enable_gpe, gpe_event_info); 604 if (ACPI_SUCCESS(status)) { 605 return_VOID; 606 } 607 608 error_exit: 609 acpi_ev_asynch_enable_gpe(gpe_event_info); 610 return_VOID; 611 } 612 613 614 /******************************************************************************* 615 * 616 * FUNCTION: acpi_ev_asynch_enable_gpe 617 * 618 * PARAMETERS: Context (gpe_event_info) - Info for this GPE 619 * Callback from acpi_os_execute 620 * 621 * RETURN: None 622 * 623 * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to 624 * complete (i.e., finish execution of Notify) 625 * 626 ******************************************************************************/ 627 628 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context) 629 { 630 struct acpi_gpe_event_info *gpe_event_info = context; 631 acpi_cpu_flags flags; 632 633 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); 634 (void)acpi_ev_finish_gpe(gpe_event_info); 635 acpi_os_release_lock(acpi_gbl_gpe_lock, flags); 636 637 return; 638 } 639 640 641 /******************************************************************************* 642 * 643 * FUNCTION: acpi_ev_finish_gpe 644 * 645 * PARAMETERS: gpe_event_info - Info for this GPE 646 * 647 * RETURN: Status 648 * 649 * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution 650 * of a GPE method or a synchronous or asynchronous GPE handler. 651 * 652 ******************************************************************************/ 653 654 acpi_status acpi_ev_finish_gpe(struct acpi_gpe_event_info * gpe_event_info) 655 { 656 acpi_status status; 657 658 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) == 659 ACPI_GPE_LEVEL_TRIGGERED) { 660 /* 661 * GPE is level-triggered, we clear the GPE status bit after 662 * handling the event. 663 */ 664 status = acpi_hw_clear_gpe(gpe_event_info); 665 if (ACPI_FAILURE(status)) { 666 return (status); 667 } 668 } 669 670 /* 671 * Enable this GPE, conditionally. This means that the GPE will 672 * only be physically enabled if the enable_mask bit is set 673 * in the event_info. 674 */ 675 (void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_CONDITIONAL_ENABLE); 676 return (AE_OK); 677 } 678 679 680 /******************************************************************************* 681 * 682 * FUNCTION: acpi_ev_gpe_dispatch 683 * 684 * PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1 685 * gpe_event_info - Info for this GPE 686 * gpe_number - Number relative to the parent GPE block 687 * 688 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED 689 * 690 * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC) 691 * or method (e.g. _Lxx/_Exx) handler. 692 * 693 * This function executes at interrupt level. 694 * 695 ******************************************************************************/ 696 697 u32 698 acpi_ev_gpe_dispatch(struct acpi_namespace_node *gpe_device, 699 struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number) 700 { 701 acpi_status status; 702 u32 return_value; 703 704 ACPI_FUNCTION_TRACE(ev_gpe_dispatch); 705 706 /* 707 * Always disable the GPE so that it does not keep firing before 708 * any asynchronous activity completes (either from the execution 709 * of a GPE method or an asynchronous GPE handler.) 710 * 711 * If there is no handler or method to run, just disable the 712 * GPE and leave it disabled permanently to prevent further such 713 * pointless events from firing. 714 */ 715 status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE); 716 if (ACPI_FAILURE(status)) { 717 ACPI_EXCEPTION((AE_INFO, status, 718 "Unable to disable GPE %02X", gpe_number)); 719 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED); 720 } 721 722 /* 723 * If edge-triggered, clear the GPE status bit now. Note that 724 * level-triggered events are cleared after the GPE is serviced. 725 */ 726 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) == 727 ACPI_GPE_EDGE_TRIGGERED) { 728 status = acpi_hw_clear_gpe(gpe_event_info); 729 if (ACPI_FAILURE(status)) { 730 ACPI_EXCEPTION((AE_INFO, status, 731 "Unable to clear GPE %02X", 732 gpe_number)); 733 (void)acpi_hw_low_set_gpe(gpe_event_info, 734 ACPI_GPE_CONDITIONAL_ENABLE); 735 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED); 736 } 737 } 738 739 /* 740 * Dispatch the GPE to either an installed handler or the control 741 * method associated with this GPE (_Lxx or _Exx). If a handler 742 * exists, we invoke it and do not attempt to run the method. 743 * If there is neither a handler nor a method, leave the GPE 744 * disabled. 745 */ 746 switch (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)) { 747 case ACPI_GPE_DISPATCH_HANDLER: 748 749 /* Invoke the installed handler (at interrupt level) */ 750 751 return_value = 752 gpe_event_info->dispatch.handler->address(gpe_device, 753 gpe_number, 754 gpe_event_info-> 755 dispatch.handler-> 756 context); 757 758 /* If requested, clear (if level-triggered) and reenable the GPE */ 759 760 if (return_value & ACPI_REENABLE_GPE) { 761 (void)acpi_ev_finish_gpe(gpe_event_info); 762 } 763 break; 764 765 case ACPI_GPE_DISPATCH_METHOD: 766 case ACPI_GPE_DISPATCH_NOTIFY: 767 /* 768 * Execute the method associated with the GPE 769 * NOTE: Level-triggered GPEs are cleared after the method completes. 770 */ 771 status = acpi_os_execute(OSL_GPE_HANDLER, 772 acpi_ev_asynch_execute_gpe_method, 773 gpe_event_info); 774 if (ACPI_FAILURE(status)) { 775 ACPI_EXCEPTION((AE_INFO, status, 776 "Unable to queue handler for GPE %02X - event disabled", 777 gpe_number)); 778 } 779 break; 780 781 default: 782 /* 783 * No handler or method to run! 784 * 03/2010: This case should no longer be possible. We will not allow 785 * a GPE to be enabled if it has no handler or method. 786 */ 787 ACPI_ERROR((AE_INFO, 788 "No handler or method for GPE %02X, disabling event", 789 gpe_number)); 790 791 break; 792 } 793 794 return_UINT32(ACPI_INTERRUPT_HANDLED); 795 } 796 797 #endif /* !ACPI_REDUCED_HARDWARE */ 798