/sys/contrib/dev/acpica/components/events/evgpe.c
C | 852 lines | 394 code | 159 blank | 299 comment | 48 complexity | 8f3a7775467f4dff11b8a905d3ce30ed MD5 | raw file
Possible License(s): MPL-2.0-no-copyleft-exception, BSD-3-Clause, LGPL-2.0, LGPL-2.1, BSD-2-Clause, 0BSD, JSON, AGPL-1.0, GPL-2.0
- /******************************************************************************
- *
- * Module Name: evgpe - General Purpose Event handling and dispatch
- *
- *****************************************************************************/
- /*
- * Copyright (C) 2000 - 2012, Intel Corp.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions, and the following disclaimer,
- * without modification.
- * 2. Redistributions in binary form must reproduce at minimum a disclaimer
- * substantially similar to the "NO WARRANTY" disclaimer below
- * ("Disclaimer") and any redistribution must be conditioned upon
- * including a substantially similar Disclaimer requirement for further
- * binary redistribution.
- * 3. Neither the names of the above-listed copyright holders nor the names
- * of any contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * Alternatively, this software may be distributed under the terms of the
- * GNU General Public License ("GPL") version 2 as published by the Free
- * Software Foundation.
- *
- * NO WARRANTY
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
- * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGES.
- */
- #include <contrib/dev/acpica/include/acpi.h>
- #include <contrib/dev/acpica/include/accommon.h>
- #include <contrib/dev/acpica/include/acevents.h>
- #include <contrib/dev/acpica/include/acnamesp.h>
- #define _COMPONENT ACPI_EVENTS
- ACPI_MODULE_NAME ("evgpe")
- #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
- /* Local prototypes */
- static void ACPI_SYSTEM_XFACE
- AcpiEvAsynchExecuteGpeMethod (
- void *Context);
- static void ACPI_SYSTEM_XFACE
- AcpiEvAsynchEnableGpe (
- void *Context);
- /*******************************************************************************
- *
- * FUNCTION: AcpiEvUpdateGpeEnableMask
- *
- * PARAMETERS: GpeEventInfo - GPE to update
- *
- * RETURN: Status
- *
- * DESCRIPTION: Updates GPE register enable mask based upon whether there are
- * runtime references to this GPE
- *
- ******************************************************************************/
- ACPI_STATUS
- AcpiEvUpdateGpeEnableMask (
- ACPI_GPE_EVENT_INFO *GpeEventInfo)
- {
- ACPI_GPE_REGISTER_INFO *GpeRegisterInfo;
- UINT32 RegisterBit;
- ACPI_FUNCTION_TRACE (EvUpdateGpeEnableMask);
- GpeRegisterInfo = GpeEventInfo->RegisterInfo;
- if (!GpeRegisterInfo)
- {
- return_ACPI_STATUS (AE_NOT_EXIST);
- }
- RegisterBit = AcpiHwGetGpeRegisterBit (GpeEventInfo);
- /* Clear the run bit up front */
- ACPI_CLEAR_BIT (GpeRegisterInfo->EnableForRun, RegisterBit);
- /* Set the mask bit only if there are references to this GPE */
- if (GpeEventInfo->RuntimeCount)
- {
- ACPI_SET_BIT (GpeRegisterInfo->EnableForRun, (UINT8) RegisterBit);
- }
- return_ACPI_STATUS (AE_OK);
- }
- /*******************************************************************************
- *
- * FUNCTION: AcpiEvEnableGpe
- *
- * PARAMETERS: GpeEventInfo - GPE to enable
- *
- * RETURN: Status
- *
- * DESCRIPTION: Clear a GPE of stale events and enable it.
- *
- ******************************************************************************/
- ACPI_STATUS
- AcpiEvEnableGpe (
- ACPI_GPE_EVENT_INFO *GpeEventInfo)
- {
- ACPI_STATUS Status;
- ACPI_FUNCTION_TRACE (EvEnableGpe);
- /*
- * We will only allow a GPE to be enabled if it has either an associated
- * method (_Lxx/_Exx) or a handler, or is using the implicit notify
- * feature. Otherwise, the GPE will be immediately disabled by
- * AcpiEvGpeDispatch the first time it fires.
- */
- if ((GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) ==
- ACPI_GPE_DISPATCH_NONE)
- {
- return_ACPI_STATUS (AE_NO_HANDLER);
- }
- /* Clear the GPE (of stale events) */
- Status = AcpiHwClearGpe (GpeEventInfo);
- if (ACPI_FAILURE (Status))
- {
- return_ACPI_STATUS (Status);
- }
- /* Enable the requested GPE */
- Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_ENABLE);
- return_ACPI_STATUS (Status);
- }
- /*******************************************************************************
- *
- * FUNCTION: AcpiEvAddGpeReference
- *
- * PARAMETERS: GpeEventInfo - Add a reference to this GPE
- *
- * RETURN: Status
- *
- * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
- * hardware-enabled.
- *
- ******************************************************************************/
- ACPI_STATUS
- AcpiEvAddGpeReference (
- ACPI_GPE_EVENT_INFO *GpeEventInfo)
- {
- ACPI_STATUS Status = AE_OK;
- ACPI_FUNCTION_TRACE (EvAddGpeReference);
- if (GpeEventInfo->RuntimeCount == ACPI_UINT8_MAX)
- {
- return_ACPI_STATUS (AE_LIMIT);
- }
- GpeEventInfo->RuntimeCount++;
- if (GpeEventInfo->RuntimeCount == 1)
- {
- /* Enable on first reference */
- Status = AcpiEvUpdateGpeEnableMask (GpeEventInfo);
- if (ACPI_SUCCESS (Status))
- {
- Status = AcpiEvEnableGpe (GpeEventInfo);
- }
- if (ACPI_FAILURE (Status))
- {
- GpeEventInfo->RuntimeCount--;
- }
- }
- return_ACPI_STATUS (Status);
- }
- /*******************************************************************************
- *
- * FUNCTION: AcpiEvRemoveGpeReference
- *
- * PARAMETERS: GpeEventInfo - Remove a reference to this GPE
- *
- * RETURN: Status
- *
- * DESCRIPTION: Remove a reference to a GPE. When the last reference is
- * removed, the GPE is hardware-disabled.
- *
- ******************************************************************************/
- ACPI_STATUS
- AcpiEvRemoveGpeReference (
- ACPI_GPE_EVENT_INFO *GpeEventInfo)
- {
- ACPI_STATUS Status = AE_OK;
- ACPI_FUNCTION_TRACE (EvRemoveGpeReference);
- if (!GpeEventInfo->RuntimeCount)
- {
- return_ACPI_STATUS (AE_LIMIT);
- }
- GpeEventInfo->RuntimeCount--;
- if (!GpeEventInfo->RuntimeCount)
- {
- /* Disable on last reference */
- Status = AcpiEvUpdateGpeEnableMask (GpeEventInfo);
- if (ACPI_SUCCESS (Status))
- {
- Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE);
- }
- if (ACPI_FAILURE (Status))
- {
- GpeEventInfo->RuntimeCount++;
- }
- }
- return_ACPI_STATUS (Status);
- }
- /*******************************************************************************
- *
- * FUNCTION: AcpiEvLowGetGpeInfo
- *
- * PARAMETERS: GpeNumber - Raw GPE number
- * GpeBlock - A GPE info block
- *
- * RETURN: A GPE EventInfo struct. NULL if not a valid GPE (The GpeNumber
- * is not within the specified GPE block)
- *
- * DESCRIPTION: Returns the EventInfo struct associated with this GPE. This is
- * the low-level implementation of EvGetGpeEventInfo.
- *
- ******************************************************************************/
- ACPI_GPE_EVENT_INFO *
- AcpiEvLowGetGpeInfo (
- UINT32 GpeNumber,
- ACPI_GPE_BLOCK_INFO *GpeBlock)
- {
- UINT32 GpeIndex;
- /*
- * Validate that the GpeNumber is within the specified GpeBlock.
- * (Two steps)
- */
- if (!GpeBlock ||
- (GpeNumber < GpeBlock->BlockBaseNumber))
- {
- return (NULL);
- }
- GpeIndex = GpeNumber - GpeBlock->BlockBaseNumber;
- if (GpeIndex >= GpeBlock->GpeCount)
- {
- return (NULL);
- }
- return (&GpeBlock->EventInfo[GpeIndex]);
- }
- /*******************************************************************************
- *
- * FUNCTION: AcpiEvGetGpeEventInfo
- *
- * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1
- * GpeNumber - Raw GPE number
- *
- * RETURN: A GPE EventInfo struct. NULL if not a valid GPE
- *
- * DESCRIPTION: Returns the EventInfo struct associated with this GPE.
- * Validates the GpeBlock and the GpeNumber
- *
- * Should be called only when the GPE lists are semaphore locked
- * and not subject to change.
- *
- ******************************************************************************/
- ACPI_GPE_EVENT_INFO *
- AcpiEvGetGpeEventInfo (
- ACPI_HANDLE GpeDevice,
- UINT32 GpeNumber)
- {
- ACPI_OPERAND_OBJECT *ObjDesc;
- ACPI_GPE_EVENT_INFO *GpeInfo;
- UINT32 i;
- ACPI_FUNCTION_ENTRY ();
- /* A NULL GpeDevice means use the FADT-defined GPE block(s) */
- if (!GpeDevice)
- {
- /* Examine GPE Block 0 and 1 (These blocks are permanent) */
- for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++)
- {
- GpeInfo = AcpiEvLowGetGpeInfo (GpeNumber,
- AcpiGbl_GpeFadtBlocks[i]);
- if (GpeInfo)
- {
- return (GpeInfo);
- }
- }
- /* The GpeNumber was not in the range of either FADT GPE block */
- return (NULL);
- }
- /* A Non-NULL GpeDevice means this is a GPE Block Device */
- ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) GpeDevice);
- if (!ObjDesc ||
- !ObjDesc->Device.GpeBlock)
- {
- return (NULL);
- }
- return (AcpiEvLowGetGpeInfo (GpeNumber, ObjDesc->Device.GpeBlock));
- }
- /*******************************************************************************
- *
- * FUNCTION: AcpiEvGpeDetect
- *
- * PARAMETERS: GpeXruptList - Interrupt block for this interrupt.
- * Can have multiple GPE blocks attached.
- *
- * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
- *
- * DESCRIPTION: Detect if any GP events have occurred. This function is
- * executed at interrupt level.
- *
- ******************************************************************************/
- UINT32
- AcpiEvGpeDetect (
- ACPI_GPE_XRUPT_INFO *GpeXruptList)
- {
- ACPI_STATUS Status;
- ACPI_GPE_BLOCK_INFO *GpeBlock;
- ACPI_GPE_REGISTER_INFO *GpeRegisterInfo;
- UINT32 IntStatus = ACPI_INTERRUPT_NOT_HANDLED;
- UINT8 EnabledStatusByte;
- UINT32 StatusReg;
- UINT32 EnableReg;
- ACPI_CPU_FLAGS Flags;
- UINT32 i;
- UINT32 j;
- ACPI_FUNCTION_NAME (EvGpeDetect);
- /* Check for the case where there are no GPEs */
- if (!GpeXruptList)
- {
- return (IntStatus);
- }
- /*
- * We need to obtain the GPE lock for both the data structs and registers
- * Note: Not necessary to obtain the hardware lock, since the GPE
- * registers are owned by the GpeLock.
- */
- Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
- /* Examine all GPE blocks attached to this interrupt level */
- GpeBlock = GpeXruptList->GpeBlockListHead;
- while (GpeBlock)
- {
- /*
- * Read all of the 8-bit GPE status and enable registers in this GPE
- * block, saving all of them. Find all currently active GP events.
- */
- for (i = 0; i < GpeBlock->RegisterCount; i++)
- {
- /* Get the next status/enable pair */
- GpeRegisterInfo = &GpeBlock->RegisterInfo[i];
- /*
- * Optimization: If there are no GPEs enabled within this
- * register, we can safely ignore the entire register.
- */
- if (!(GpeRegisterInfo->EnableForRun |
- GpeRegisterInfo->EnableForWake))
- {
- ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS,
- "Ignore disabled registers for GPE%02X-GPE%02X: "
- "RunEnable=%02X, WakeEnable=%02X\n",
- GpeRegisterInfo->BaseGpeNumber,
- GpeRegisterInfo->BaseGpeNumber + (ACPI_GPE_REGISTER_WIDTH - 1),
- GpeRegisterInfo->EnableForRun,
- GpeRegisterInfo->EnableForWake));
- continue;
- }
- /* Read the Status Register */
- Status = AcpiHwRead (&StatusReg, &GpeRegisterInfo->StatusAddress);
- if (ACPI_FAILURE (Status))
- {
- goto UnlockAndExit;
- }
- /* Read the Enable Register */
- Status = AcpiHwRead (&EnableReg, &GpeRegisterInfo->EnableAddress);
- if (ACPI_FAILURE (Status))
- {
- goto UnlockAndExit;
- }
- ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS,
- "Read registers for GPE%02X-GPE%02X: Status=%02X, Enable=%02X, "
- "RunEnable=%02X, WakeEnable=%02X\n",
- GpeRegisterInfo->BaseGpeNumber,
- GpeRegisterInfo->BaseGpeNumber + (ACPI_GPE_REGISTER_WIDTH - 1),
- StatusReg, EnableReg,
- GpeRegisterInfo->EnableForRun,
- GpeRegisterInfo->EnableForWake));
- /* Check if there is anything active at all in this register */
- EnabledStatusByte = (UINT8) (StatusReg & EnableReg);
- if (!EnabledStatusByte)
- {
- /* No active GPEs in this register, move on */
- continue;
- }
- /* Now look at the individual GPEs in this byte register */
- for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++)
- {
- /* Examine one GPE bit */
- if (EnabledStatusByte & (1 << j))
- {
- /*
- * Found an active GPE. Dispatch the event to a handler
- * or method.
- */
- IntStatus |= AcpiEvGpeDispatch (GpeBlock->Node,
- &GpeBlock->EventInfo[((ACPI_SIZE) i *
- ACPI_GPE_REGISTER_WIDTH) + j],
- j + GpeRegisterInfo->BaseGpeNumber);
- }
- }
- }
- GpeBlock = GpeBlock->Next;
- }
- UnlockAndExit:
- AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
- return (IntStatus);
- }
- /*******************************************************************************
- *
- * FUNCTION: AcpiEvAsynchExecuteGpeMethod
- *
- * PARAMETERS: Context (GpeEventInfo) - Info for this GPE
- *
- * RETURN: None
- *
- * DESCRIPTION: Perform the actual execution of a GPE control method. This
- * function is called from an invocation of AcpiOsExecute and
- * therefore does NOT execute at interrupt level - so that
- * the control method itself is not executed in the context of
- * an interrupt handler.
- *
- ******************************************************************************/
- static void ACPI_SYSTEM_XFACE
- AcpiEvAsynchExecuteGpeMethod (
- void *Context)
- {
- ACPI_GPE_EVENT_INFO *GpeEventInfo = Context;
- ACPI_STATUS Status;
- ACPI_GPE_EVENT_INFO *LocalGpeEventInfo;
- ACPI_EVALUATE_INFO *Info;
- ACPI_GPE_NOTIFY_INFO *Notify;
- ACPI_FUNCTION_TRACE (EvAsynchExecuteGpeMethod);
- /* Allocate a local GPE block */
- LocalGpeEventInfo = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_GPE_EVENT_INFO));
- if (!LocalGpeEventInfo)
- {
- ACPI_EXCEPTION ((AE_INFO, AE_NO_MEMORY,
- "while handling a GPE"));
- return_VOID;
- }
- Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
- if (ACPI_FAILURE (Status))
- {
- return_VOID;
- }
- /* Must revalidate the GpeNumber/GpeBlock */
- if (!AcpiEvValidGpeEvent (GpeEventInfo))
- {
- Status = AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
- return_VOID;
- }
- /*
- * Take a snapshot of the GPE info for this level - we copy the info to
- * prevent a race condition with RemoveHandler/RemoveBlock.
- */
- ACPI_MEMCPY (LocalGpeEventInfo, GpeEventInfo,
- sizeof (ACPI_GPE_EVENT_INFO));
- Status = AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
- if (ACPI_FAILURE (Status))
- {
- return_VOID;
- }
- /* Do the correct dispatch - normal method or implicit notify */
- switch (LocalGpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK)
- {
- case ACPI_GPE_DISPATCH_NOTIFY:
- /*
- * Implicit notify.
- * Dispatch a DEVICE_WAKE notify to the appropriate handler.
- * NOTE: the request is queued for execution after this method
- * completes. The notify handlers are NOT invoked synchronously
- * from this thread -- because handlers may in turn run other
- * control methods.
- *
- * June 2012: Expand implicit notify mechanism to support
- * notifies on multiple device objects.
- */
- Notify = LocalGpeEventInfo->Dispatch.NotifyList;
- while (ACPI_SUCCESS (Status) && Notify)
- {
- Status = AcpiEvQueueNotifyRequest (Notify->DeviceNode,
- ACPI_NOTIFY_DEVICE_WAKE);
- Notify = Notify->Next;
- }
- break;
- case ACPI_GPE_DISPATCH_METHOD:
- /* Allocate the evaluation information block */
- Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
- if (!Info)
- {
- Status = AE_NO_MEMORY;
- }
- else
- {
- /*
- * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the
- * _Lxx/_Exx control method that corresponds to this GPE
- */
- Info->PrefixNode = LocalGpeEventInfo->Dispatch.MethodNode;
- Info->Flags = ACPI_IGNORE_RETURN_VALUE;
- Status = AcpiNsEvaluate (Info);
- ACPI_FREE (Info);
- }
- if (ACPI_FAILURE (Status))
- {
- ACPI_EXCEPTION ((AE_INFO, Status,
- "while evaluating GPE method [%4.4s]",
- AcpiUtGetNodeName (LocalGpeEventInfo->Dispatch.MethodNode)));
- }
- break;
- default:
- return_VOID; /* Should never happen */
- }
- /* Defer enabling of GPE until all notify handlers are done */
- Status = AcpiOsExecute (OSL_NOTIFY_HANDLER,
- AcpiEvAsynchEnableGpe, LocalGpeEventInfo);
- if (ACPI_FAILURE (Status))
- {
- ACPI_FREE (LocalGpeEventInfo);
- }
- return_VOID;
- }
- /*******************************************************************************
- *
- * FUNCTION: AcpiEvAsynchEnableGpe
- *
- * PARAMETERS: Context (GpeEventInfo) - Info for this GPE
- * Callback from AcpiOsExecute
- *
- * RETURN: None
- *
- * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to
- * complete (i.e., finish execution of Notify)
- *
- ******************************************************************************/
- static void ACPI_SYSTEM_XFACE
- AcpiEvAsynchEnableGpe (
- void *Context)
- {
- ACPI_GPE_EVENT_INFO *GpeEventInfo = Context;
- (void) AcpiEvFinishGpe (GpeEventInfo);
- ACPI_FREE (GpeEventInfo);
- return;
- }
- /*******************************************************************************
- *
- * FUNCTION: AcpiEvFinishGpe
- *
- * PARAMETERS: GpeEventInfo - Info for this GPE
- *
- * RETURN: Status
- *
- * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution
- * of a GPE method or a synchronous or asynchronous GPE handler.
- *
- ******************************************************************************/
- ACPI_STATUS
- AcpiEvFinishGpe (
- ACPI_GPE_EVENT_INFO *GpeEventInfo)
- {
- ACPI_STATUS Status;
- if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
- ACPI_GPE_LEVEL_TRIGGERED)
- {
- /*
- * GPE is level-triggered, we clear the GPE status bit after
- * handling the event.
- */
- Status = AcpiHwClearGpe (GpeEventInfo);
- if (ACPI_FAILURE (Status))
- {
- return (Status);
- }
- }
- /*
- * Enable this GPE, conditionally. This means that the GPE will
- * only be physically enabled if the EnableForRun bit is set
- * in the EventInfo.
- */
- (void) AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_CONDITIONAL_ENABLE);
- return (AE_OK);
- }
- /*******************************************************************************
- *
- * FUNCTION: AcpiEvGpeDispatch
- *
- * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1
- * GpeEventInfo - Info for this GPE
- * GpeNumber - Number relative to the parent GPE block
- *
- * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
- *
- * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
- * or method (e.g. _Lxx/_Exx) handler.
- *
- * This function executes at interrupt level.
- *
- ******************************************************************************/
- UINT32
- AcpiEvGpeDispatch (
- ACPI_NAMESPACE_NODE *GpeDevice,
- ACPI_GPE_EVENT_INFO *GpeEventInfo,
- UINT32 GpeNumber)
- {
- ACPI_STATUS Status;
- UINT32 ReturnValue;
- ACPI_FUNCTION_TRACE (EvGpeDispatch);
- /* Invoke global event handler if present */
- AcpiGpeCount++;
- if (AcpiGbl_GlobalEventHandler)
- {
- AcpiGbl_GlobalEventHandler (ACPI_EVENT_TYPE_GPE, GpeDevice,
- GpeNumber, AcpiGbl_GlobalEventHandlerContext);
- }
- /*
- * If edge-triggered, clear the GPE status bit now. Note that
- * level-triggered events are cleared after the GPE is serviced.
- */
- if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
- ACPI_GPE_EDGE_TRIGGERED)
- {
- Status = AcpiHwClearGpe (GpeEventInfo);
- if (ACPI_FAILURE (Status))
- {
- ACPI_EXCEPTION ((AE_INFO, Status,
- "Unable to clear GPE%02X", GpeNumber));
- return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED);
- }
- }
- /*
- * Always disable the GPE so that it does not keep firing before
- * any asynchronous activity completes (either from the execution
- * of a GPE method or an asynchronous GPE handler.)
- *
- * If there is no handler or method to run, just disable the
- * GPE and leave it disabled permanently to prevent further such
- * pointless events from firing.
- */
- Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE);
- if (ACPI_FAILURE (Status))
- {
- ACPI_EXCEPTION ((AE_INFO, Status,
- "Unable to disable GPE%02X", GpeNumber));
- return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED);
- }
- /*
- * Dispatch the GPE to either an installed handler or the control
- * method associated with this GPE (_Lxx or _Exx). If a handler
- * exists, we invoke it and do not attempt to run the method.
- * If there is neither a handler nor a method, leave the GPE
- * disabled.
- */
- switch (GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK)
- {
- case ACPI_GPE_DISPATCH_HANDLER:
- /* Invoke the installed handler (at interrupt level) */
- ReturnValue = GpeEventInfo->Dispatch.Handler->Address (
- GpeDevice, GpeNumber,
- GpeEventInfo->Dispatch.Handler->Context);
- /* If requested, clear (if level-triggered) and reenable the GPE */
- if (ReturnValue & ACPI_REENABLE_GPE)
- {
- (void) AcpiEvFinishGpe (GpeEventInfo);
- }
- break;
- case ACPI_GPE_DISPATCH_METHOD:
- case ACPI_GPE_DISPATCH_NOTIFY:
- /*
- * Execute the method associated with the GPE
- * NOTE: Level-triggered GPEs are cleared after the method completes.
- */
- Status = AcpiOsExecute (OSL_GPE_HANDLER,
- AcpiEvAsynchExecuteGpeMethod, GpeEventInfo);
- if (ACPI_FAILURE (Status))
- {
- ACPI_EXCEPTION ((AE_INFO, Status,
- "Unable to queue handler for GPE%02X - event disabled",
- GpeNumber));
- }
- break;
- default:
- /*
- * No handler or method to run!
- * 03/2010: This case should no longer be possible. We will not allow
- * a GPE to be enabled if it has no handler or method.
- */
- ACPI_ERROR ((AE_INFO,
- "No handler or method for GPE%02X, disabling event",
- GpeNumber));
- break;
- }
- return_UINT32 (ACPI_INTERRUPT_HANDLED);
- }
- #endif /* !ACPI_REDUCED_HARDWARE */