1 /******************************************************************************
3 * Module Name: evgpe - General Purpose Event handling and dispatch
5 *****************************************************************************/
7 /******************************************************************************
11 * Some or all of this work - Copyright (c) 1999 - 2014, 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
);
207 * We will only allow a GPE to be enabled if it has either an associated
208 * method (_Lxx/_Exx) or a handler, or is using the implicit notify
209 * feature. Otherwise, the GPE will be immediately disabled by
210 * AcpiEvGpeDispatch the first time it fires.
212 if ((GpeEventInfo
->Flags
& ACPI_GPE_DISPATCH_MASK
) ==
213 ACPI_GPE_DISPATCH_NONE
)
215 return_ACPI_STATUS (AE_NO_HANDLER
);
218 /* Clear the GPE (of stale events) */
220 Status
= AcpiHwClearGpe (GpeEventInfo
);
221 if (ACPI_FAILURE (Status
))
223 return_ACPI_STATUS (Status
);
226 /* Enable the requested GPE */
228 Status
= AcpiHwLowSetGpe (GpeEventInfo
, ACPI_GPE_ENABLE
);
229 return_ACPI_STATUS (Status
);
233 /*******************************************************************************
235 * FUNCTION: AcpiEvAddGpeReference
237 * PARAMETERS: GpeEventInfo - Add a reference to this GPE
241 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
244 ******************************************************************************/
247 AcpiEvAddGpeReference (
248 ACPI_GPE_EVENT_INFO
*GpeEventInfo
)
250 ACPI_STATUS Status
= AE_OK
;
253 ACPI_FUNCTION_TRACE (EvAddGpeReference
);
256 if (GpeEventInfo
->RuntimeCount
== ACPI_UINT8_MAX
)
258 return_ACPI_STATUS (AE_LIMIT
);
261 GpeEventInfo
->RuntimeCount
++;
262 if (GpeEventInfo
->RuntimeCount
== 1)
264 /* Enable on first reference */
266 Status
= AcpiEvUpdateGpeEnableMask (GpeEventInfo
);
267 if (ACPI_SUCCESS (Status
))
269 Status
= AcpiEvEnableGpe (GpeEventInfo
);
272 if (ACPI_FAILURE (Status
))
274 GpeEventInfo
->RuntimeCount
--;
278 return_ACPI_STATUS (Status
);
282 /*******************************************************************************
284 * FUNCTION: AcpiEvRemoveGpeReference
286 * PARAMETERS: GpeEventInfo - Remove a reference to this GPE
290 * DESCRIPTION: Remove a reference to a GPE. When the last reference is
291 * removed, the GPE is hardware-disabled.
293 ******************************************************************************/
296 AcpiEvRemoveGpeReference (
297 ACPI_GPE_EVENT_INFO
*GpeEventInfo
)
299 ACPI_STATUS Status
= AE_OK
;
302 ACPI_FUNCTION_TRACE (EvRemoveGpeReference
);
305 if (!GpeEventInfo
->RuntimeCount
)
307 return_ACPI_STATUS (AE_LIMIT
);
310 GpeEventInfo
->RuntimeCount
--;
311 if (!GpeEventInfo
->RuntimeCount
)
313 /* Disable on last reference */
315 Status
= AcpiEvUpdateGpeEnableMask (GpeEventInfo
);
316 if (ACPI_SUCCESS (Status
))
318 Status
= AcpiHwLowSetGpe (GpeEventInfo
, ACPI_GPE_DISABLE
);
321 if (ACPI_FAILURE (Status
))
323 GpeEventInfo
->RuntimeCount
++;
327 return_ACPI_STATUS (Status
);
331 /*******************************************************************************
333 * FUNCTION: AcpiEvLowGetGpeInfo
335 * PARAMETERS: GpeNumber - Raw GPE number
336 * GpeBlock - A GPE info block
338 * RETURN: A GPE EventInfo struct. NULL if not a valid GPE (The GpeNumber
339 * is not within the specified GPE block)
341 * DESCRIPTION: Returns the EventInfo struct associated with this GPE. This is
342 * the low-level implementation of EvGetGpeEventInfo.
344 ******************************************************************************/
346 ACPI_GPE_EVENT_INFO
*
347 AcpiEvLowGetGpeInfo (
349 ACPI_GPE_BLOCK_INFO
*GpeBlock
)
355 * Validate that the GpeNumber is within the specified GpeBlock.
359 (GpeNumber
< GpeBlock
->BlockBaseNumber
))
364 GpeIndex
= GpeNumber
- GpeBlock
->BlockBaseNumber
;
365 if (GpeIndex
>= GpeBlock
->GpeCount
)
370 return (&GpeBlock
->EventInfo
[GpeIndex
]);
374 /*******************************************************************************
376 * FUNCTION: AcpiEvGetGpeEventInfo
378 * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1
379 * GpeNumber - Raw GPE number
381 * RETURN: A GPE EventInfo struct. NULL if not a valid GPE
383 * DESCRIPTION: Returns the EventInfo struct associated with this GPE.
384 * Validates the GpeBlock and the GpeNumber
386 * Should be called only when the GPE lists are semaphore locked
387 * and not subject to change.
389 ******************************************************************************/
391 ACPI_GPE_EVENT_INFO
*
392 AcpiEvGetGpeEventInfo (
393 ACPI_HANDLE GpeDevice
,
396 ACPI_OPERAND_OBJECT
*ObjDesc
;
397 ACPI_GPE_EVENT_INFO
*GpeInfo
;
401 ACPI_FUNCTION_ENTRY ();
404 /* A NULL GpeDevice means use the FADT-defined GPE block(s) */
408 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
410 for (i
= 0; i
< ACPI_MAX_GPE_BLOCKS
; i
++)
412 GpeInfo
= AcpiEvLowGetGpeInfo (GpeNumber
,
413 AcpiGbl_GpeFadtBlocks
[i
]);
420 /* The GpeNumber was not in the range of either FADT GPE block */
425 /* A Non-NULL GpeDevice means this is a GPE Block Device */
427 ObjDesc
= AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE
*) GpeDevice
);
429 !ObjDesc
->Device
.GpeBlock
)
434 return (AcpiEvLowGetGpeInfo (GpeNumber
, ObjDesc
->Device
.GpeBlock
));
438 /*******************************************************************************
440 * FUNCTION: AcpiEvGpeDetect
442 * PARAMETERS: GpeXruptList - Interrupt block for this interrupt.
443 * Can have multiple GPE blocks attached.
445 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
447 * DESCRIPTION: Detect if any GP events have occurred. This function is
448 * executed at interrupt level.
450 ******************************************************************************/
454 ACPI_GPE_XRUPT_INFO
*GpeXruptList
)
457 ACPI_GPE_BLOCK_INFO
*GpeBlock
;
458 ACPI_GPE_REGISTER_INFO
*GpeRegisterInfo
;
459 UINT32 IntStatus
= ACPI_INTERRUPT_NOT_HANDLED
;
460 UINT8 EnabledStatusByte
;
463 ACPI_CPU_FLAGS Flags
;
468 ACPI_FUNCTION_NAME (EvGpeDetect
);
470 /* Check for the case where there are no GPEs */
478 * We need to obtain the GPE lock for both the data structs and registers
479 * Note: Not necessary to obtain the hardware lock, since the GPE
480 * registers are owned by the GpeLock.
482 Flags
= AcpiOsAcquireLock (AcpiGbl_GpeLock
);
484 /* Examine all GPE blocks attached to this interrupt level */
486 GpeBlock
= GpeXruptList
->GpeBlockListHead
;
490 * Read all of the 8-bit GPE status and enable registers in this GPE
491 * block, saving all of them. Find all currently active GP events.
493 for (i
= 0; i
< GpeBlock
->RegisterCount
; i
++)
495 /* Get the next status/enable pair */
497 GpeRegisterInfo
= &GpeBlock
->RegisterInfo
[i
];
500 * Optimization: If there are no GPEs enabled within this
501 * register, we can safely ignore the entire register.
503 if (!(GpeRegisterInfo
->EnableForRun
|
504 GpeRegisterInfo
->EnableForWake
))
506 ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS
,
507 "Ignore disabled registers for GPE%02X-GPE%02X: "
508 "RunEnable=%02X, WakeEnable=%02X\n",
509 GpeRegisterInfo
->BaseGpeNumber
,
510 GpeRegisterInfo
->BaseGpeNumber
+ (ACPI_GPE_REGISTER_WIDTH
- 1),
511 GpeRegisterInfo
->EnableForRun
,
512 GpeRegisterInfo
->EnableForWake
));
516 /* Read the Status Register */
518 Status
= AcpiHwRead (&StatusReg
, &GpeRegisterInfo
->StatusAddress
);
519 if (ACPI_FAILURE (Status
))
524 /* Read the Enable Register */
526 Status
= AcpiHwRead (&EnableReg
, &GpeRegisterInfo
->EnableAddress
);
527 if (ACPI_FAILURE (Status
))
532 ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS
,
533 "Read registers for GPE%02X-GPE%02X: Status=%02X, Enable=%02X, "
534 "RunEnable=%02X, WakeEnable=%02X\n",
535 GpeRegisterInfo
->BaseGpeNumber
,
536 GpeRegisterInfo
->BaseGpeNumber
+ (ACPI_GPE_REGISTER_WIDTH
- 1),
537 StatusReg
, EnableReg
,
538 GpeRegisterInfo
->EnableForRun
,
539 GpeRegisterInfo
->EnableForWake
));
541 /* Check if there is anything active at all in this register */
543 EnabledStatusByte
= (UINT8
) (StatusReg
& EnableReg
);
544 if (!EnabledStatusByte
)
546 /* No active GPEs in this register, move on */
551 /* Now look at the individual GPEs in this byte register */
553 for (j
= 0; j
< ACPI_GPE_REGISTER_WIDTH
; j
++)
555 /* Examine one GPE bit */
557 if (EnabledStatusByte
& (1 << j
))
560 * Found an active GPE. Dispatch the event to a handler
563 IntStatus
|= AcpiEvGpeDispatch (GpeBlock
->Node
,
564 &GpeBlock
->EventInfo
[((ACPI_SIZE
) i
*
565 ACPI_GPE_REGISTER_WIDTH
) + j
],
566 j
+ GpeRegisterInfo
->BaseGpeNumber
);
571 GpeBlock
= GpeBlock
->Next
;
576 AcpiOsReleaseLock (AcpiGbl_GpeLock
, Flags
);
581 /*******************************************************************************
583 * FUNCTION: AcpiEvAsynchExecuteGpeMethod
585 * PARAMETERS: Context (GpeEventInfo) - Info for this GPE
589 * DESCRIPTION: Perform the actual execution of a GPE control method. This
590 * function is called from an invocation of AcpiOsExecute and
591 * therefore does NOT execute at interrupt level - so that
592 * the control method itself is not executed in the context of
593 * an interrupt handler.
595 ******************************************************************************/
597 static void ACPI_SYSTEM_XFACE
598 AcpiEvAsynchExecuteGpeMethod (
601 ACPI_GPE_EVENT_INFO
*GpeEventInfo
= Context
;
603 ACPI_GPE_EVENT_INFO
*LocalGpeEventInfo
;
604 ACPI_EVALUATE_INFO
*Info
;
605 ACPI_GPE_NOTIFY_INFO
*Notify
;
608 ACPI_FUNCTION_TRACE (EvAsynchExecuteGpeMethod
);
611 /* Allocate a local GPE block */
613 LocalGpeEventInfo
= ACPI_ALLOCATE_ZEROED (sizeof (ACPI_GPE_EVENT_INFO
));
614 if (!LocalGpeEventInfo
)
616 ACPI_EXCEPTION ((AE_INFO
, AE_NO_MEMORY
,
617 "while handling a GPE"));
621 Status
= AcpiUtAcquireMutex (ACPI_MTX_EVENTS
);
622 if (ACPI_FAILURE (Status
))
624 ACPI_FREE (LocalGpeEventInfo
);
628 /* Must revalidate the GpeNumber/GpeBlock */
630 if (!AcpiEvValidGpeEvent (GpeEventInfo
))
632 Status
= AcpiUtReleaseMutex (ACPI_MTX_EVENTS
);
633 ACPI_FREE (LocalGpeEventInfo
);
638 * Take a snapshot of the GPE info for this level - we copy the info to
639 * prevent a race condition with RemoveHandler/RemoveBlock.
641 ACPI_MEMCPY (LocalGpeEventInfo
, GpeEventInfo
,
642 sizeof (ACPI_GPE_EVENT_INFO
));
644 Status
= AcpiUtReleaseMutex (ACPI_MTX_EVENTS
);
645 if (ACPI_FAILURE (Status
))
647 ACPI_FREE (LocalGpeEventInfo
);
651 /* Do the correct dispatch - normal method or implicit notify */
653 switch (LocalGpeEventInfo
->Flags
& ACPI_GPE_DISPATCH_MASK
)
655 case ACPI_GPE_DISPATCH_NOTIFY
:
658 * Dispatch a DEVICE_WAKE notify to the appropriate handler.
659 * NOTE: the request is queued for execution after this method
660 * completes. The notify handlers are NOT invoked synchronously
661 * from this thread -- because handlers may in turn run other
664 * June 2012: Expand implicit notify mechanism to support
665 * notifies on multiple device objects.
667 Notify
= LocalGpeEventInfo
->Dispatch
.NotifyList
;
668 while (ACPI_SUCCESS (Status
) && Notify
)
670 Status
= AcpiEvQueueNotifyRequest (Notify
->DeviceNode
,
671 ACPI_NOTIFY_DEVICE_WAKE
);
673 Notify
= Notify
->Next
;
677 case ACPI_GPE_DISPATCH_METHOD
:
679 /* Allocate the evaluation information block */
681 Info
= ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO
));
684 Status
= AE_NO_MEMORY
;
689 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the
690 * _Lxx/_Exx control method that corresponds to this GPE
692 Info
->PrefixNode
= LocalGpeEventInfo
->Dispatch
.MethodNode
;
693 Info
->Flags
= ACPI_IGNORE_RETURN_VALUE
;
695 Status
= AcpiNsEvaluate (Info
);
699 if (ACPI_FAILURE (Status
))
701 ACPI_EXCEPTION ((AE_INFO
, Status
,
702 "while evaluating GPE method [%4.4s]",
703 AcpiUtGetNodeName (LocalGpeEventInfo
->Dispatch
.MethodNode
)));
709 return_VOID
; /* Should never happen */
712 /* Defer enabling of GPE until all notify handlers are done */
714 Status
= AcpiOsExecute (OSL_NOTIFY_HANDLER
,
715 AcpiEvAsynchEnableGpe
, LocalGpeEventInfo
);
716 if (ACPI_FAILURE (Status
))
718 ACPI_FREE (LocalGpeEventInfo
);
724 /*******************************************************************************
726 * FUNCTION: AcpiEvAsynchEnableGpe
728 * PARAMETERS: Context (GpeEventInfo) - Info for this GPE
729 * Callback from AcpiOsExecute
733 * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to
734 * complete (i.e., finish execution of Notify)
736 ******************************************************************************/
738 static void ACPI_SYSTEM_XFACE
739 AcpiEvAsynchEnableGpe (
742 ACPI_GPE_EVENT_INFO
*GpeEventInfo
= Context
;
745 (void) AcpiEvFinishGpe (GpeEventInfo
);
747 ACPI_FREE (GpeEventInfo
);
752 /*******************************************************************************
754 * FUNCTION: AcpiEvFinishGpe
756 * PARAMETERS: GpeEventInfo - Info for this GPE
760 * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution
761 * of a GPE method or a synchronous or asynchronous GPE handler.
763 ******************************************************************************/
767 ACPI_GPE_EVENT_INFO
*GpeEventInfo
)
772 if ((GpeEventInfo
->Flags
& ACPI_GPE_XRUPT_TYPE_MASK
) ==
773 ACPI_GPE_LEVEL_TRIGGERED
)
776 * GPE is level-triggered, we clear the GPE status bit after
777 * handling the event.
779 Status
= AcpiHwClearGpe (GpeEventInfo
);
780 if (ACPI_FAILURE (Status
))
787 * Enable this GPE, conditionally. This means that the GPE will
788 * only be physically enabled if the EnableForRun bit is set
791 (void) AcpiHwLowSetGpe (GpeEventInfo
, ACPI_GPE_CONDITIONAL_ENABLE
);
796 /*******************************************************************************
798 * FUNCTION: AcpiEvGpeDispatch
800 * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1
801 * GpeEventInfo - Info for this GPE
802 * GpeNumber - Number relative to the parent GPE block
804 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
806 * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
807 * or method (e.g. _Lxx/_Exx) handler.
809 * This function executes at interrupt level.
811 ******************************************************************************/
815 ACPI_NAMESPACE_NODE
*GpeDevice
,
816 ACPI_GPE_EVENT_INFO
*GpeEventInfo
,
823 ACPI_FUNCTION_TRACE (EvGpeDispatch
);
826 /* Invoke global event handler if present */
829 if (AcpiGbl_GlobalEventHandler
)
831 AcpiGbl_GlobalEventHandler (ACPI_EVENT_TYPE_GPE
, GpeDevice
,
832 GpeNumber
, AcpiGbl_GlobalEventHandlerContext
);
836 * If edge-triggered, clear the GPE status bit now. Note that
837 * level-triggered events are cleared after the GPE is serviced.
839 if ((GpeEventInfo
->Flags
& ACPI_GPE_XRUPT_TYPE_MASK
) ==
840 ACPI_GPE_EDGE_TRIGGERED
)
842 Status
= AcpiHwClearGpe (GpeEventInfo
);
843 if (ACPI_FAILURE (Status
))
845 ACPI_EXCEPTION ((AE_INFO
, Status
,
846 "Unable to clear GPE%02X", GpeNumber
));
847 return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED
);
852 * Always disable the GPE so that it does not keep firing before
853 * any asynchronous activity completes (either from the execution
854 * of a GPE method or an asynchronous GPE handler.)
856 * If there is no handler or method to run, just disable the
857 * GPE and leave it disabled permanently to prevent further such
858 * pointless events from firing.
860 Status
= AcpiHwLowSetGpe (GpeEventInfo
, ACPI_GPE_DISABLE
);
861 if (ACPI_FAILURE (Status
))
863 ACPI_EXCEPTION ((AE_INFO
, Status
,
864 "Unable to disable GPE%02X", GpeNumber
));
865 return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED
);
869 * Dispatch the GPE to either an installed handler or the control
870 * method associated with this GPE (_Lxx or _Exx). If a handler
871 * exists, we invoke it and do not attempt to run the method.
872 * If there is neither a handler nor a method, leave the GPE
875 switch (GpeEventInfo
->Flags
& ACPI_GPE_DISPATCH_MASK
)
877 case ACPI_GPE_DISPATCH_HANDLER
:
879 /* Invoke the installed handler (at interrupt level) */
881 ReturnValue
= GpeEventInfo
->Dispatch
.Handler
->Address (
882 GpeDevice
, GpeNumber
,
883 GpeEventInfo
->Dispatch
.Handler
->Context
);
885 /* If requested, clear (if level-triggered) and reenable the GPE */
887 if (ReturnValue
& ACPI_REENABLE_GPE
)
889 (void) AcpiEvFinishGpe (GpeEventInfo
);
893 case ACPI_GPE_DISPATCH_METHOD
:
894 case ACPI_GPE_DISPATCH_NOTIFY
:
896 * Execute the method associated with the GPE
897 * NOTE: Level-triggered GPEs are cleared after the method completes.
899 Status
= AcpiOsExecute (OSL_GPE_HANDLER
,
900 AcpiEvAsynchExecuteGpeMethod
, GpeEventInfo
);
901 if (ACPI_FAILURE (Status
))
903 ACPI_EXCEPTION ((AE_INFO
, Status
,
904 "Unable to queue handler for GPE%02X - event disabled",
911 * No handler or method to run!
912 * 03/2010: This case should no longer be possible. We will not allow
913 * a GPE to be enabled if it has no handler or method.
915 ACPI_ERROR ((AE_INFO
,
916 "No handler or method for GPE%02X, disabling event",
921 return_UINT32 (ACPI_INTERRUPT_HANDLED
);
924 #endif /* !ACPI_REDUCED_HARDWARE */