1 /******************************************************************************
3 * Module Name: evgpe - General Purpose Event handling and dispatch
5 *****************************************************************************/
7 /******************************************************************************
11 * Some or all of this work - Copyright (c) 1999 - 2015, Intel Corp.
12 * All rights reserved.
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
37 * The above copyright and patent license is granted only if the following
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
67 * substantial portion of the Covered Code or modification must reproduce the
68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
72 * 3.4. Intel retains all right, title, and interest in and to the Original
75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76 * Intel shall be used in advertising or otherwise to promote the sale, use or
77 * other dealings in products derived from or relating to the Covered Code
78 * without prior written authorization from Intel.
80 * 4. Disclaimer and Export Compliance
82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
100 * software or system incorporating such software without first obtaining any
101 * required license or other approval from the U. S. Department of Commerce or
102 * any other agency or department of the United States Government. In the
103 * event Licensee exports any such software from the United States or
104 * re-exports any such software from a foreign destination, Licensee shall
105 * ensure that the distribution and export/re-export of the software is in
106 * compliance with all laws, regulations, orders, or other restrictions of the
107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108 * any of its subsidiaries will export/re-export any technical data, process,
109 * software, or service, directly or indirectly, to any country for which the
110 * United States government or any agency thereof requires an export license,
111 * other governmental approval, or letter of assurance, without first obtaining
112 * such license, approval or letter.
114 *****************************************************************************/
117 #include "accommon.h"
118 #include "acevents.h"
119 #include "acnamesp.h"
121 #define _COMPONENT ACPI_EVENTS
122 ACPI_MODULE_NAME ("evgpe")
124 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
126 /* Local prototypes */
128 static void ACPI_SYSTEM_XFACE
129 AcpiEvAsynchExecuteGpeMethod (
132 static void ACPI_SYSTEM_XFACE
133 AcpiEvAsynchEnableGpe (
137 /*******************************************************************************
139 * FUNCTION: AcpiEvUpdateGpeEnableMask
141 * PARAMETERS: GpeEventInfo - GPE to update
145 * DESCRIPTION: Updates GPE register enable mask based upon whether there are
146 * runtime references to this GPE
148 ******************************************************************************/
151 AcpiEvUpdateGpeEnableMask (
152 ACPI_GPE_EVENT_INFO *GpeEventInfo)
154 ACPI_GPE_REGISTER_INFO *GpeRegisterInfo;
158 ACPI_FUNCTION_TRACE (EvUpdateGpeEnableMask);
161 GpeRegisterInfo = GpeEventInfo->RegisterInfo;
162 if (!GpeRegisterInfo)
164 return_ACPI_STATUS (AE_NOT_EXIST);
167 RegisterBit = AcpiHwGetGpeRegisterBit (GpeEventInfo);
169 /* Clear the run bit up front */
171 ACPI_CLEAR_BIT (GpeRegisterInfo->EnableForRun, RegisterBit);
173 /* Set the mask bit only if there are references to this GPE */
175 if (GpeEventInfo->RuntimeCount)
177 ACPI_SET_BIT (GpeRegisterInfo->EnableForRun, (UINT8) RegisterBit);
180 return_ACPI_STATUS (AE_OK);
184 /*******************************************************************************
186 * FUNCTION: AcpiEvEnableGpe
188 * PARAMETERS: GpeEventInfo - GPE to enable
192 * DESCRIPTION: Clear a GPE of stale events and enable it.
194 ******************************************************************************/
198 ACPI_GPE_EVENT_INFO *GpeEventInfo)
203 ACPI_FUNCTION_TRACE (EvEnableGpe);
206 /* Clear the GPE (of stale events) */
208 Status = AcpiHwClearGpe (GpeEventInfo);
209 if (ACPI_FAILURE (Status))
211 return_ACPI_STATUS (Status);
214 /* Enable the requested GPE */
216 Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_ENABLE_SAVE);
217 return_ACPI_STATUS (Status);
221 /*******************************************************************************
223 * FUNCTION: AcpiEvAddGpeReference
225 * PARAMETERS: GpeEventInfo - Add a reference to this GPE
229 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
232 ******************************************************************************/
235 AcpiEvAddGpeReference (
236 ACPI_GPE_EVENT_INFO *GpeEventInfo)
238 ACPI_STATUS Status = AE_OK;
241 ACPI_FUNCTION_TRACE (EvAddGpeReference);
244 if (GpeEventInfo->RuntimeCount == ACPI_UINT8_MAX)
246 return_ACPI_STATUS (AE_LIMIT);
249 GpeEventInfo->RuntimeCount++;
250 if (GpeEventInfo->RuntimeCount == 1)
252 /* Enable on first reference */
254 Status = AcpiEvUpdateGpeEnableMask (GpeEventInfo);
255 if (ACPI_SUCCESS (Status))
257 Status = AcpiEvEnableGpe (GpeEventInfo);
260 if (ACPI_FAILURE (Status))
262 GpeEventInfo->RuntimeCount--;
266 return_ACPI_STATUS (Status);
270 /*******************************************************************************
272 * FUNCTION: AcpiEvRemoveGpeReference
274 * PARAMETERS: GpeEventInfo - Remove a reference to this GPE
278 * DESCRIPTION: Remove a reference to a GPE. When the last reference is
279 * removed, the GPE is hardware-disabled.
281 ******************************************************************************/
284 AcpiEvRemoveGpeReference (
285 ACPI_GPE_EVENT_INFO *GpeEventInfo)
287 ACPI_STATUS Status = AE_OK;
290 ACPI_FUNCTION_TRACE (EvRemoveGpeReference);
293 if (!GpeEventInfo->RuntimeCount)
295 return_ACPI_STATUS (AE_LIMIT);
298 GpeEventInfo->RuntimeCount--;
299 if (!GpeEventInfo->RuntimeCount)
301 /* Disable on last reference */
303 Status = AcpiEvUpdateGpeEnableMask (GpeEventInfo);
304 if (ACPI_SUCCESS (Status))
306 Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE_SAVE);
309 if (ACPI_FAILURE (Status))
311 GpeEventInfo->RuntimeCount++;
315 return_ACPI_STATUS (Status);
319 /*******************************************************************************
321 * FUNCTION: AcpiEvLowGetGpeInfo
323 * PARAMETERS: GpeNumber - Raw GPE number
324 * GpeBlock - A GPE info block
326 * RETURN: A GPE EventInfo struct. NULL if not a valid GPE (The GpeNumber
327 * is not within the specified GPE block)
329 * DESCRIPTION: Returns the EventInfo struct associated with this GPE. This is
330 * the low-level implementation of EvGetGpeEventInfo.
332 ******************************************************************************/
334 ACPI_GPE_EVENT_INFO *
335 AcpiEvLowGetGpeInfo (
337 ACPI_GPE_BLOCK_INFO *GpeBlock)
343 * Validate that the GpeNumber is within the specified GpeBlock.
347 (GpeNumber < GpeBlock->BlockBaseNumber))
352 GpeIndex = GpeNumber - GpeBlock->BlockBaseNumber;
353 if (GpeIndex >= GpeBlock->GpeCount)
358 return (&GpeBlock->EventInfo[GpeIndex]);
362 /*******************************************************************************
364 * FUNCTION: AcpiEvGetGpeEventInfo
366 * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1
367 * GpeNumber - Raw GPE number
369 * RETURN: A GPE EventInfo struct. NULL if not a valid GPE
371 * DESCRIPTION: Returns the EventInfo struct associated with this GPE.
372 * Validates the GpeBlock and the GpeNumber
374 * Should be called only when the GPE lists are semaphore locked
375 * and not subject to change.
377 ******************************************************************************/
379 ACPI_GPE_EVENT_INFO *
380 AcpiEvGetGpeEventInfo (
381 ACPI_HANDLE GpeDevice,
384 ACPI_OPERAND_OBJECT *ObjDesc;
385 ACPI_GPE_EVENT_INFO *GpeInfo;
389 ACPI_FUNCTION_ENTRY ();
392 /* A NULL GpeDevice means use the FADT-defined GPE block(s) */
396 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
398 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++)
400 GpeInfo = AcpiEvLowGetGpeInfo (GpeNumber,
401 AcpiGbl_GpeFadtBlocks[i]);
408 /* The GpeNumber was not in the range of either FADT GPE block */
413 /* A Non-NULL GpeDevice means this is a GPE Block Device */
415 ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) GpeDevice);
417 !ObjDesc->Device.GpeBlock)
422 return (AcpiEvLowGetGpeInfo (GpeNumber, ObjDesc->Device.GpeBlock));
426 /*******************************************************************************
428 * FUNCTION: AcpiEvGpeDetect
430 * PARAMETERS: GpeXruptList - Interrupt block for this interrupt.
431 * Can have multiple GPE blocks attached.
433 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
435 * DESCRIPTION: Detect if any GP events have occurred. This function is
436 * executed at interrupt level.
438 ******************************************************************************/
442 ACPI_GPE_XRUPT_INFO *GpeXruptList)
445 ACPI_GPE_BLOCK_INFO *GpeBlock;
446 ACPI_NAMESPACE_NODE *GpeDevice;
447 ACPI_GPE_REGISTER_INFO *GpeRegisterInfo;
448 ACPI_GPE_EVENT_INFO *GpeEventInfo;
450 ACPI_GPE_HANDLER_INFO *GpeHandlerInfo;
451 UINT32 IntStatus = ACPI_INTERRUPT_NOT_HANDLED;
452 UINT8 EnabledStatusByte;
455 ACPI_CPU_FLAGS Flags;
460 ACPI_FUNCTION_NAME (EvGpeDetect);
462 /* Check for the case where there are no GPEs */
470 * We need to obtain the GPE lock for both the data structs and registers
471 * Note: Not necessary to obtain the hardware lock, since the GPE
472 * registers are owned by the GpeLock.
474 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
476 /* Examine all GPE blocks attached to this interrupt level */
478 GpeBlock = GpeXruptList->GpeBlockListHead;
481 GpeDevice = GpeBlock->Node;
484 * Read all of the 8-bit GPE status and enable registers in this GPE
485 * block, saving all of them. Find all currently active GP events.
487 for (i = 0; i < GpeBlock->RegisterCount; i++)
489 /* Get the next status/enable pair */
491 GpeRegisterInfo = &GpeBlock->RegisterInfo[i];
494 * Optimization: If there are no GPEs enabled within this
495 * register, we can safely ignore the entire register.
497 if (!(GpeRegisterInfo->EnableForRun |
498 GpeRegisterInfo->EnableForWake))
500 ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS,
501 "Ignore disabled registers for GPE %02X-%02X: "
502 "RunEnable=%02X, WakeEnable=%02X\n",
503 GpeRegisterInfo->BaseGpeNumber,
504 GpeRegisterInfo->BaseGpeNumber + (ACPI_GPE_REGISTER_WIDTH - 1),
505 GpeRegisterInfo->EnableForRun,
506 GpeRegisterInfo->EnableForWake));
510 /* Read the Status Register */
512 Status = AcpiHwRead (&StatusReg, &GpeRegisterInfo->StatusAddress);
513 if (ACPI_FAILURE (Status))
518 /* Read the Enable Register */
520 Status = AcpiHwRead (&EnableReg, &GpeRegisterInfo->EnableAddress);
521 if (ACPI_FAILURE (Status))
526 ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS,
527 "Read registers for GPE %02X-%02X: Status=%02X, Enable=%02X, "
528 "RunEnable=%02X, WakeEnable=%02X\n",
529 GpeRegisterInfo->BaseGpeNumber,
530 GpeRegisterInfo->BaseGpeNumber + (ACPI_GPE_REGISTER_WIDTH - 1),
531 StatusReg, EnableReg,
532 GpeRegisterInfo->EnableForRun,
533 GpeRegisterInfo->EnableForWake));
535 /* Check if there is anything active at all in this register */
537 EnabledStatusByte = (UINT8) (StatusReg & EnableReg);
538 if (!EnabledStatusByte)
540 /* No active GPEs in this register, move on */
545 /* Now look at the individual GPEs in this byte register */
547 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++)
549 /* Examine one GPE bit */
551 GpeEventInfo = &GpeBlock->EventInfo[((ACPI_SIZE) i *
552 ACPI_GPE_REGISTER_WIDTH) + j];
553 GpeNumber = j + GpeRegisterInfo->BaseGpeNumber;
555 if (EnabledStatusByte & (1 << j))
557 /* Invoke global event handler if present */
560 if (AcpiGbl_GlobalEventHandler)
562 AcpiGbl_GlobalEventHandler (ACPI_EVENT_TYPE_GPE,
563 GpeDevice, GpeNumber,
564 AcpiGbl_GlobalEventHandlerContext);
567 /* Found an active GPE */
569 if (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) ==
570 ACPI_GPE_DISPATCH_RAW_HANDLER)
572 /* Dispatch the event to a raw handler */
574 GpeHandlerInfo = GpeEventInfo->Dispatch.Handler;
577 * There is no protection around the namespace node
578 * and the GPE handler to ensure a safe destruction
580 * 1. The namespace node is expected to always
581 * exist after loading a table.
582 * 2. The GPE handler is expected to be flushed by
583 * AcpiOsWaitEventsComplete() before the
586 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
587 IntStatus |= GpeHandlerInfo->Address (
588 GpeDevice, GpeNumber, GpeHandlerInfo->Context);
589 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
594 * Dispatch the event to a standard handler or
597 IntStatus |= AcpiEvGpeDispatch (GpeDevice,
598 GpeEventInfo, GpeNumber);
604 GpeBlock = GpeBlock->Next;
609 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
614 /*******************************************************************************
616 * FUNCTION: AcpiEvAsynchExecuteGpeMethod
618 * PARAMETERS: Context (GpeEventInfo) - Info for this GPE
622 * DESCRIPTION: Perform the actual execution of a GPE control method. This
623 * function is called from an invocation of AcpiOsExecute and
624 * therefore does NOT execute at interrupt level - so that
625 * the control method itself is not executed in the context of
626 * an interrupt handler.
628 ******************************************************************************/
630 static void ACPI_SYSTEM_XFACE
631 AcpiEvAsynchExecuteGpeMethod (
634 ACPI_GPE_EVENT_INFO *GpeEventInfo = Context;
635 ACPI_STATUS Status = AE_OK;
636 ACPI_EVALUATE_INFO *Info;
637 ACPI_GPE_NOTIFY_INFO *Notify;
640 ACPI_FUNCTION_TRACE (EvAsynchExecuteGpeMethod);
643 /* Do the correct dispatch - normal method or implicit notify */
645 switch (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags))
647 case ACPI_GPE_DISPATCH_NOTIFY:
650 * Dispatch a DEVICE_WAKE notify to the appropriate handler.
651 * NOTE: the request is queued for execution after this method
652 * completes. The notify handlers are NOT invoked synchronously
653 * from this thread -- because handlers may in turn run other
656 * June 2012: Expand implicit notify mechanism to support
657 * notifies on multiple device objects.
659 Notify = GpeEventInfo->Dispatch.NotifyList;
660 while (ACPI_SUCCESS (Status) && Notify)
662 Status = AcpiEvQueueNotifyRequest (Notify->DeviceNode,
663 ACPI_NOTIFY_DEVICE_WAKE);
665 Notify = Notify->Next;
669 case ACPI_GPE_DISPATCH_METHOD:
671 /* Allocate the evaluation information block */
673 Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
676 Status = AE_NO_MEMORY;
681 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the
682 * _Lxx/_Exx control method that corresponds to this GPE
684 Info->PrefixNode = GpeEventInfo->Dispatch.MethodNode;
685 Info->Flags = ACPI_IGNORE_RETURN_VALUE;
687 Status = AcpiNsEvaluate (Info);
691 if (ACPI_FAILURE (Status))
693 ACPI_EXCEPTION ((AE_INFO, Status,
694 "while evaluating GPE method [%4.4s]",
695 AcpiUtGetNodeName (GpeEventInfo->Dispatch.MethodNode)));
701 goto ErrorExit; /* Should never happen */
704 /* Defer enabling of GPE until all notify handlers are done */
706 Status = AcpiOsExecute (OSL_NOTIFY_HANDLER,
707 AcpiEvAsynchEnableGpe, GpeEventInfo);
708 if (ACPI_SUCCESS (Status))
714 AcpiEvAsynchEnableGpe (GpeEventInfo);
719 /*******************************************************************************
721 * FUNCTION: AcpiEvAsynchEnableGpe
723 * PARAMETERS: Context (GpeEventInfo) - Info for this GPE
724 * Callback from AcpiOsExecute
728 * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to
729 * complete (i.e., finish execution of Notify)
731 ******************************************************************************/
733 static void ACPI_SYSTEM_XFACE
734 AcpiEvAsynchEnableGpe (
737 ACPI_GPE_EVENT_INFO *GpeEventInfo = Context;
738 ACPI_CPU_FLAGS Flags;
741 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
742 (void) AcpiEvFinishGpe (GpeEventInfo);
743 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
749 /*******************************************************************************
751 * FUNCTION: AcpiEvFinishGpe
753 * PARAMETERS: GpeEventInfo - Info for this GPE
757 * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution
758 * of a GPE method or a synchronous or asynchronous GPE handler.
760 ******************************************************************************/
764 ACPI_GPE_EVENT_INFO *GpeEventInfo)
769 if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
770 ACPI_GPE_LEVEL_TRIGGERED)
773 * GPE is level-triggered, we clear the GPE status bit after
774 * handling the event.
776 Status = AcpiHwClearGpe (GpeEventInfo);
777 if (ACPI_FAILURE (Status))
784 * Enable this GPE, conditionally. This means that the GPE will
785 * only be physically enabled if the EnableMask bit is set
788 (void) AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_CONDITIONAL_ENABLE);
793 /*******************************************************************************
795 * FUNCTION: AcpiEvGpeDispatch
797 * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1
798 * GpeEventInfo - Info for this GPE
799 * GpeNumber - Number relative to the parent GPE block
801 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
803 * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
804 * or method (e.g. _Lxx/_Exx) handler.
806 * This function executes at interrupt level.
808 ******************************************************************************/
812 ACPI_NAMESPACE_NODE *GpeDevice,
813 ACPI_GPE_EVENT_INFO *GpeEventInfo,
820 ACPI_FUNCTION_TRACE (EvGpeDispatch);
824 * Always disable the GPE so that it does not keep firing before
825 * any asynchronous activity completes (either from the execution
826 * of a GPE method or an asynchronous GPE handler.)
828 * If there is no handler or method to run, just disable the
829 * GPE and leave it disabled permanently to prevent further such
830 * pointless events from firing.
832 Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE);
833 if (ACPI_FAILURE (Status))
835 ACPI_EXCEPTION ((AE_INFO, Status,
836 "Unable to disable GPE %02X", GpeNumber));
837 return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED);
841 * If edge-triggered, clear the GPE status bit now. Note that
842 * level-triggered events are cleared after the GPE is serviced.
844 if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
845 ACPI_GPE_EDGE_TRIGGERED)
847 Status = AcpiHwClearGpe (GpeEventInfo);
848 if (ACPI_FAILURE (Status))
850 ACPI_EXCEPTION ((AE_INFO, Status,
851 "Unable to clear GPE %02X", GpeNumber));
852 (void) AcpiHwLowSetGpe (GpeEventInfo,
853 ACPI_GPE_CONDITIONAL_ENABLE);
854 return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED);
859 * Dispatch the GPE to either an installed handler or the control
860 * method associated with this GPE (_Lxx or _Exx). If a handler
861 * exists, we invoke it and do not attempt to run the method.
862 * If there is neither a handler nor a method, leave the GPE
865 switch (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags))
867 case ACPI_GPE_DISPATCH_HANDLER:
869 /* Invoke the installed handler (at interrupt level) */
871 ReturnValue = GpeEventInfo->Dispatch.Handler->Address (
872 GpeDevice, GpeNumber,
873 GpeEventInfo->Dispatch.Handler->Context);
875 /* If requested, clear (if level-triggered) and reenable the GPE */
877 if (ReturnValue & ACPI_REENABLE_GPE)
879 (void) AcpiEvFinishGpe (GpeEventInfo);
883 case ACPI_GPE_DISPATCH_METHOD:
884 case ACPI_GPE_DISPATCH_NOTIFY:
886 * Execute the method associated with the GPE
887 * NOTE: Level-triggered GPEs are cleared after the method completes.
889 Status = AcpiOsExecute (OSL_GPE_HANDLER,
890 AcpiEvAsynchExecuteGpeMethod, GpeEventInfo);
891 if (ACPI_FAILURE (Status))
893 ACPI_EXCEPTION ((AE_INFO, Status,
894 "Unable to queue handler for GPE %02X - event disabled",
901 * No handler or method to run!
902 * 03/2010: This case should no longer be possible. We will not allow
903 * a GPE to be enabled if it has no handler or method.
905 ACPI_ERROR ((AE_INFO,
906 "No handler or method for GPE %02X, disabling event",
911 return_UINT32 (ACPI_INTERRUPT_HANDLED);
914 #endif /* !ACPI_REDUCED_HARDWARE */