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
);
179 GpeRegisterInfo
->EnableMask
= GpeRegisterInfo
->EnableForRun
;
181 return_ACPI_STATUS (AE_OK
);
185 /*******************************************************************************
187 * FUNCTION: AcpiEvEnableGpe
189 * PARAMETERS: GpeEventInfo - GPE to enable
193 * DESCRIPTION: Clear a GPE of stale events and enable it.
195 ******************************************************************************/
199 ACPI_GPE_EVENT_INFO
*GpeEventInfo
)
204 ACPI_FUNCTION_TRACE (EvEnableGpe
);
207 /* Clear the GPE (of stale events) */
209 Status
= AcpiHwClearGpe (GpeEventInfo
);
210 if (ACPI_FAILURE (Status
))
212 return_ACPI_STATUS (Status
);
215 /* Enable the requested GPE */
217 Status
= AcpiHwLowSetGpe (GpeEventInfo
, ACPI_GPE_ENABLE
);
218 return_ACPI_STATUS (Status
);
222 /*******************************************************************************
224 * FUNCTION: AcpiEvAddGpeReference
226 * PARAMETERS: GpeEventInfo - Add a reference to this GPE
230 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
233 ******************************************************************************/
236 AcpiEvAddGpeReference (
237 ACPI_GPE_EVENT_INFO
*GpeEventInfo
)
239 ACPI_STATUS Status
= AE_OK
;
242 ACPI_FUNCTION_TRACE (EvAddGpeReference
);
245 if (GpeEventInfo
->RuntimeCount
== ACPI_UINT8_MAX
)
247 return_ACPI_STATUS (AE_LIMIT
);
250 GpeEventInfo
->RuntimeCount
++;
251 if (GpeEventInfo
->RuntimeCount
== 1)
253 /* Enable on first reference */
255 Status
= AcpiEvUpdateGpeEnableMask (GpeEventInfo
);
256 if (ACPI_SUCCESS (Status
))
258 Status
= AcpiEvEnableGpe (GpeEventInfo
);
261 if (ACPI_FAILURE (Status
))
263 GpeEventInfo
->RuntimeCount
--;
267 return_ACPI_STATUS (Status
);
271 /*******************************************************************************
273 * FUNCTION: AcpiEvRemoveGpeReference
275 * PARAMETERS: GpeEventInfo - Remove a reference to this GPE
279 * DESCRIPTION: Remove a reference to a GPE. When the last reference is
280 * removed, the GPE is hardware-disabled.
282 ******************************************************************************/
285 AcpiEvRemoveGpeReference (
286 ACPI_GPE_EVENT_INFO
*GpeEventInfo
)
288 ACPI_STATUS Status
= AE_OK
;
291 ACPI_FUNCTION_TRACE (EvRemoveGpeReference
);
294 if (!GpeEventInfo
->RuntimeCount
)
296 return_ACPI_STATUS (AE_LIMIT
);
299 GpeEventInfo
->RuntimeCount
--;
300 if (!GpeEventInfo
->RuntimeCount
)
302 /* Disable on last reference */
304 Status
= AcpiEvUpdateGpeEnableMask (GpeEventInfo
);
305 if (ACPI_SUCCESS (Status
))
307 Status
= AcpiHwLowSetGpe (GpeEventInfo
, ACPI_GPE_DISABLE
);
310 if (ACPI_FAILURE (Status
))
312 GpeEventInfo
->RuntimeCount
++;
316 return_ACPI_STATUS (Status
);
320 /*******************************************************************************
322 * FUNCTION: AcpiEvLowGetGpeInfo
324 * PARAMETERS: GpeNumber - Raw GPE number
325 * GpeBlock - A GPE info block
327 * RETURN: A GPE EventInfo struct. NULL if not a valid GPE (The GpeNumber
328 * is not within the specified GPE block)
330 * DESCRIPTION: Returns the EventInfo struct associated with this GPE. This is
331 * the low-level implementation of EvGetGpeEventInfo.
333 ******************************************************************************/
335 ACPI_GPE_EVENT_INFO
*
336 AcpiEvLowGetGpeInfo (
338 ACPI_GPE_BLOCK_INFO
*GpeBlock
)
344 * Validate that the GpeNumber is within the specified GpeBlock.
348 (GpeNumber
< GpeBlock
->BlockBaseNumber
))
353 GpeIndex
= GpeNumber
- GpeBlock
->BlockBaseNumber
;
354 if (GpeIndex
>= GpeBlock
->GpeCount
)
359 return (&GpeBlock
->EventInfo
[GpeIndex
]);
363 /*******************************************************************************
365 * FUNCTION: AcpiEvGetGpeEventInfo
367 * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1
368 * GpeNumber - Raw GPE number
370 * RETURN: A GPE EventInfo struct. NULL if not a valid GPE
372 * DESCRIPTION: Returns the EventInfo struct associated with this GPE.
373 * Validates the GpeBlock and the GpeNumber
375 * Should be called only when the GPE lists are semaphore locked
376 * and not subject to change.
378 ******************************************************************************/
380 ACPI_GPE_EVENT_INFO
*
381 AcpiEvGetGpeEventInfo (
382 ACPI_HANDLE GpeDevice
,
385 ACPI_OPERAND_OBJECT
*ObjDesc
;
386 ACPI_GPE_EVENT_INFO
*GpeInfo
;
390 ACPI_FUNCTION_ENTRY ();
393 /* A NULL GpeDevice means use the FADT-defined GPE block(s) */
397 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
399 for (i
= 0; i
< ACPI_MAX_GPE_BLOCKS
; i
++)
401 GpeInfo
= AcpiEvLowGetGpeInfo (GpeNumber
,
402 AcpiGbl_GpeFadtBlocks
[i
]);
409 /* The GpeNumber was not in the range of either FADT GPE block */
414 /* A Non-NULL GpeDevice means this is a GPE Block Device */
416 ObjDesc
= AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE
*) GpeDevice
);
418 !ObjDesc
->Device
.GpeBlock
)
423 return (AcpiEvLowGetGpeInfo (GpeNumber
, ObjDesc
->Device
.GpeBlock
));
427 /*******************************************************************************
429 * FUNCTION: AcpiEvGpeDetect
431 * PARAMETERS: GpeXruptList - Interrupt block for this interrupt.
432 * Can have multiple GPE blocks attached.
434 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
436 * DESCRIPTION: Detect if any GP events have occurred. This function is
437 * executed at interrupt level.
439 ******************************************************************************/
443 ACPI_GPE_XRUPT_INFO
*GpeXruptList
)
446 ACPI_GPE_BLOCK_INFO
*GpeBlock
;
447 ACPI_NAMESPACE_NODE
*GpeDevice
;
448 ACPI_GPE_REGISTER_INFO
*GpeRegisterInfo
;
449 ACPI_GPE_EVENT_INFO
*GpeEventInfo
;
451 ACPI_GPE_HANDLER_INFO
*GpeHandlerInfo
;
452 UINT32 IntStatus
= ACPI_INTERRUPT_NOT_HANDLED
;
453 UINT8 EnabledStatusByte
;
456 ACPI_CPU_FLAGS Flags
;
461 ACPI_FUNCTION_NAME (EvGpeDetect
);
463 /* Check for the case where there are no GPEs */
471 * We need to obtain the GPE lock for both the data structs and registers
472 * Note: Not necessary to obtain the hardware lock, since the GPE
473 * registers are owned by the GpeLock.
475 Flags
= AcpiOsAcquireLock (AcpiGbl_GpeLock
);
477 /* Examine all GPE blocks attached to this interrupt level */
479 GpeBlock
= GpeXruptList
->GpeBlockListHead
;
482 GpeDevice
= GpeBlock
->Node
;
485 * Read all of the 8-bit GPE status and enable registers in this GPE
486 * block, saving all of them. Find all currently active GP events.
488 for (i
= 0; i
< GpeBlock
->RegisterCount
; i
++)
490 /* Get the next status/enable pair */
492 GpeRegisterInfo
= &GpeBlock
->RegisterInfo
[i
];
495 * Optimization: If there are no GPEs enabled within this
496 * register, we can safely ignore the entire register.
498 if (!(GpeRegisterInfo
->EnableForRun
|
499 GpeRegisterInfo
->EnableForWake
))
501 ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS
,
502 "Ignore disabled registers for GPE %02X-%02X: "
503 "RunEnable=%02X, WakeEnable=%02X\n",
504 GpeRegisterInfo
->BaseGpeNumber
,
505 GpeRegisterInfo
->BaseGpeNumber
+ (ACPI_GPE_REGISTER_WIDTH
- 1),
506 GpeRegisterInfo
->EnableForRun
,
507 GpeRegisterInfo
->EnableForWake
));
511 /* Read the Status Register */
513 Status
= AcpiHwRead (&StatusReg
, &GpeRegisterInfo
->StatusAddress
);
514 if (ACPI_FAILURE (Status
))
519 /* Read the Enable Register */
521 Status
= AcpiHwRead (&EnableReg
, &GpeRegisterInfo
->EnableAddress
);
522 if (ACPI_FAILURE (Status
))
527 ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS
,
528 "Read registers for GPE %02X-%02X: Status=%02X, Enable=%02X, "
529 "RunEnable=%02X, WakeEnable=%02X\n",
530 GpeRegisterInfo
->BaseGpeNumber
,
531 GpeRegisterInfo
->BaseGpeNumber
+ (ACPI_GPE_REGISTER_WIDTH
- 1),
532 StatusReg
, EnableReg
,
533 GpeRegisterInfo
->EnableForRun
,
534 GpeRegisterInfo
->EnableForWake
));
536 /* Check if there is anything active at all in this register */
538 EnabledStatusByte
= (UINT8
) (StatusReg
& EnableReg
);
539 if (!EnabledStatusByte
)
541 /* No active GPEs in this register, move on */
546 /* Now look at the individual GPEs in this byte register */
548 for (j
= 0; j
< ACPI_GPE_REGISTER_WIDTH
; j
++)
550 /* Examine one GPE bit */
552 GpeEventInfo
= &GpeBlock
->EventInfo
[((ACPI_SIZE
) i
*
553 ACPI_GPE_REGISTER_WIDTH
) + j
];
554 GpeNumber
= j
+ GpeRegisterInfo
->BaseGpeNumber
;
556 if (EnabledStatusByte
& (1 << j
))
558 /* Invoke global event handler if present */
561 if (AcpiGbl_GlobalEventHandler
)
563 AcpiGbl_GlobalEventHandler (ACPI_EVENT_TYPE_GPE
,
564 GpeDevice
, GpeNumber
,
565 AcpiGbl_GlobalEventHandlerContext
);
568 /* Found an active GPE */
570 if (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo
->Flags
) ==
571 ACPI_GPE_DISPATCH_RAW_HANDLER
)
573 /* Dispatch the event to a raw handler */
575 GpeHandlerInfo
= GpeEventInfo
->Dispatch
.Handler
;
578 * There is no protection around the namespace node
579 * and the GPE handler to ensure a safe destruction
581 * 1. The namespace node is expected to always
582 * exist after loading a table.
583 * 2. The GPE handler is expected to be flushed by
584 * AcpiOsWaitEventsComplete() before the
587 AcpiOsReleaseLock (AcpiGbl_GpeLock
, Flags
);
588 IntStatus
|= GpeHandlerInfo
->Address (
589 GpeDevice
, GpeNumber
, GpeHandlerInfo
->Context
);
590 Flags
= AcpiOsAcquireLock (AcpiGbl_GpeLock
);
595 * Dispatch the event to a standard handler or
598 IntStatus
|= AcpiEvGpeDispatch (GpeDevice
,
599 GpeEventInfo
, GpeNumber
);
605 GpeBlock
= GpeBlock
->Next
;
610 AcpiOsReleaseLock (AcpiGbl_GpeLock
, Flags
);
615 /*******************************************************************************
617 * FUNCTION: AcpiEvAsynchExecuteGpeMethod
619 * PARAMETERS: Context (GpeEventInfo) - Info for this GPE
623 * DESCRIPTION: Perform the actual execution of a GPE control method. This
624 * function is called from an invocation of AcpiOsExecute and
625 * therefore does NOT execute at interrupt level - so that
626 * the control method itself is not executed in the context of
627 * an interrupt handler.
629 ******************************************************************************/
631 static void ACPI_SYSTEM_XFACE
632 AcpiEvAsynchExecuteGpeMethod (
635 ACPI_GPE_EVENT_INFO
*GpeEventInfo
= Context
;
636 ACPI_STATUS Status
= AE_OK
;
637 ACPI_EVALUATE_INFO
*Info
;
638 ACPI_GPE_NOTIFY_INFO
*Notify
;
641 ACPI_FUNCTION_TRACE (EvAsynchExecuteGpeMethod
);
644 /* Do the correct dispatch - normal method or implicit notify */
646 switch (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo
->Flags
))
648 case ACPI_GPE_DISPATCH_NOTIFY
:
651 * Dispatch a DEVICE_WAKE notify to the appropriate handler.
652 * NOTE: the request is queued for execution after this method
653 * completes. The notify handlers are NOT invoked synchronously
654 * from this thread -- because handlers may in turn run other
657 * June 2012: Expand implicit notify mechanism to support
658 * notifies on multiple device objects.
660 Notify
= GpeEventInfo
->Dispatch
.NotifyList
;
661 while (ACPI_SUCCESS (Status
) && Notify
)
663 Status
= AcpiEvQueueNotifyRequest (Notify
->DeviceNode
,
664 ACPI_NOTIFY_DEVICE_WAKE
);
666 Notify
= Notify
->Next
;
670 case ACPI_GPE_DISPATCH_METHOD
:
672 /* Allocate the evaluation information block */
674 Info
= ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO
));
677 Status
= AE_NO_MEMORY
;
682 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the
683 * _Lxx/_Exx control method that corresponds to this GPE
685 Info
->PrefixNode
= GpeEventInfo
->Dispatch
.MethodNode
;
686 Info
->Flags
= ACPI_IGNORE_RETURN_VALUE
;
688 Status
= AcpiNsEvaluate (Info
);
692 if (ACPI_FAILURE (Status
))
694 ACPI_EXCEPTION ((AE_INFO
, Status
,
695 "while evaluating GPE method [%4.4s]",
696 AcpiUtGetNodeName (GpeEventInfo
->Dispatch
.MethodNode
)));
702 goto ErrorExit
; /* Should never happen */
705 /* Defer enabling of GPE until all notify handlers are done */
707 Status
= AcpiOsExecute (OSL_NOTIFY_HANDLER
,
708 AcpiEvAsynchEnableGpe
, GpeEventInfo
);
709 if (ACPI_SUCCESS (Status
))
715 AcpiEvAsynchEnableGpe (GpeEventInfo
);
720 /*******************************************************************************
722 * FUNCTION: AcpiEvAsynchEnableGpe
724 * PARAMETERS: Context (GpeEventInfo) - Info for this GPE
725 * Callback from AcpiOsExecute
729 * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to
730 * complete (i.e., finish execution of Notify)
732 ******************************************************************************/
734 static void ACPI_SYSTEM_XFACE
735 AcpiEvAsynchEnableGpe (
738 ACPI_GPE_EVENT_INFO
*GpeEventInfo
= Context
;
739 ACPI_CPU_FLAGS Flags
;
742 Flags
= AcpiOsAcquireLock (AcpiGbl_GpeLock
);
743 (void) AcpiEvFinishGpe (GpeEventInfo
);
744 AcpiOsReleaseLock (AcpiGbl_GpeLock
, Flags
);
750 /*******************************************************************************
752 * FUNCTION: AcpiEvFinishGpe
754 * PARAMETERS: GpeEventInfo - Info for this GPE
758 * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution
759 * of a GPE method or a synchronous or asynchronous GPE handler.
761 ******************************************************************************/
765 ACPI_GPE_EVENT_INFO
*GpeEventInfo
)
770 if ((GpeEventInfo
->Flags
& ACPI_GPE_XRUPT_TYPE_MASK
) ==
771 ACPI_GPE_LEVEL_TRIGGERED
)
774 * GPE is level-triggered, we clear the GPE status bit after
775 * handling the event.
777 Status
= AcpiHwClearGpe (GpeEventInfo
);
778 if (ACPI_FAILURE (Status
))
785 * Enable this GPE, conditionally. This means that the GPE will
786 * only be physically enabled if the EnableMask bit is set
789 (void) AcpiHwLowSetGpe (GpeEventInfo
, ACPI_GPE_CONDITIONAL_ENABLE
);
794 /*******************************************************************************
796 * FUNCTION: AcpiEvGpeDispatch
798 * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1
799 * GpeEventInfo - Info for this GPE
800 * GpeNumber - Number relative to the parent GPE block
802 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
804 * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
805 * or method (e.g. _Lxx/_Exx) handler.
807 * This function executes at interrupt level.
809 ******************************************************************************/
813 ACPI_NAMESPACE_NODE
*GpeDevice
,
814 ACPI_GPE_EVENT_INFO
*GpeEventInfo
,
821 ACPI_FUNCTION_TRACE (EvGpeDispatch
);
825 * Always disable the GPE so that it does not keep firing before
826 * any asynchronous activity completes (either from the execution
827 * of a GPE method or an asynchronous GPE handler.)
829 * If there is no handler or method to run, just disable the
830 * GPE and leave it disabled permanently to prevent further such
831 * pointless events from firing.
833 Status
= AcpiHwLowSetGpe (GpeEventInfo
, ACPI_GPE_DISABLE
);
834 if (ACPI_FAILURE (Status
))
836 ACPI_EXCEPTION ((AE_INFO
, Status
,
837 "Unable to disable GPE %02X", GpeNumber
));
838 return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED
);
842 * If edge-triggered, clear the GPE status bit now. Note that
843 * level-triggered events are cleared after the GPE is serviced.
845 if ((GpeEventInfo
->Flags
& ACPI_GPE_XRUPT_TYPE_MASK
) ==
846 ACPI_GPE_EDGE_TRIGGERED
)
848 Status
= AcpiHwClearGpe (GpeEventInfo
);
849 if (ACPI_FAILURE (Status
))
851 ACPI_EXCEPTION ((AE_INFO
, Status
,
852 "Unable to clear GPE %02X", GpeNumber
));
853 (void) AcpiHwLowSetGpe (GpeEventInfo
,
854 ACPI_GPE_CONDITIONAL_ENABLE
);
855 return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED
);
860 * Dispatch the GPE to either an installed handler or the control
861 * method associated with this GPE (_Lxx or _Exx). If a handler
862 * exists, we invoke it and do not attempt to run the method.
863 * If there is neither a handler nor a method, leave the GPE
866 switch (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo
->Flags
))
868 case ACPI_GPE_DISPATCH_HANDLER
:
870 /* Invoke the installed handler (at interrupt level) */
872 ReturnValue
= GpeEventInfo
->Dispatch
.Handler
->Address (
873 GpeDevice
, GpeNumber
,
874 GpeEventInfo
->Dispatch
.Handler
->Context
);
876 /* If requested, clear (if level-triggered) and reenable the GPE */
878 if (ReturnValue
& ACPI_REENABLE_GPE
)
880 (void) AcpiEvFinishGpe (GpeEventInfo
);
884 case ACPI_GPE_DISPATCH_METHOD
:
885 case ACPI_GPE_DISPATCH_NOTIFY
:
887 * Execute the method associated with the GPE
888 * NOTE: Level-triggered GPEs are cleared after the method completes.
890 Status
= AcpiOsExecute (OSL_GPE_HANDLER
,
891 AcpiEvAsynchExecuteGpeMethod
, GpeEventInfo
);
892 if (ACPI_FAILURE (Status
))
894 ACPI_EXCEPTION ((AE_INFO
, Status
,
895 "Unable to queue handler for GPE %02X - event disabled",
902 * No handler or method to run!
903 * 03/2010: This case should no longer be possible. We will not allow
904 * a GPE to be enabled if it has no handler or method.
906 ACPI_ERROR ((AE_INFO
,
907 "No handler or method for GPE %02X, disabling event",
912 return_UINT32 (ACPI_INTERRUPT_HANDLED
);
915 #endif /* !ACPI_REDUCED_HARDWARE */