ACPI_STATUS
AcpiSetGpe (
ACPI_HANDLE GpeDevice,
UINT32 GpeNumber,
UINT8 Action)
{
ACPI_GPE_EVENT_INFO *GpeEventInfo;
ACPI_STATUS Status;
ACPI_CPU_FLAGS Flags;
ACPI_FUNCTION_TRACE (AcpiSetGpe);
Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
/* Ensure that we have a valid GPE number */
GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
if (!GpeEventInfo)
{
Status = AE_BAD_PARAMETER;
goto UnlockAndExit;
}
/* Perform the action */
switch (Action)
{
case ACPI_GPE_ENABLE:
Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_ENABLE);
GpeEventInfo->DisableForDispatch = FALSE;
break;
case ACPI_GPE_DISABLE:
Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE);
GpeEventInfo->DisableForDispatch = TRUE;
break;
default:
Status = AE_BAD_PARAMETER;
break;
}
UnlockAndExit:
AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
return_ACPI_STATUS (Status);
}
ACPI_STATUS
AcpiEvMaskGpe (
ACPI_GPE_EVENT_INFO *GpeEventInfo,
BOOLEAN IsMasked)
{
ACPI_GPE_REGISTER_INFO *GpeRegisterInfo;
UINT32 RegisterBit;
ACPI_FUNCTION_TRACE (EvMaskGpe);
GpeRegisterInfo = GpeEventInfo->RegisterInfo;
if (!GpeRegisterInfo)
{
return_ACPI_STATUS (AE_NOT_EXIST);
}
RegisterBit = AcpiHwGetGpeRegisterBit (GpeEventInfo);
/* Perform the action */
if (IsMasked)
{
if (RegisterBit & GpeRegisterInfo->MaskForRun)
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
(void) AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE);
ACPI_SET_BIT (GpeRegisterInfo->MaskForRun, (UINT8) RegisterBit);
}
else
{
if (!(RegisterBit & GpeRegisterInfo->MaskForRun))
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
ACPI_CLEAR_BIT (GpeRegisterInfo->MaskForRun, (UINT8) RegisterBit);
if (GpeEventInfo->RuntimeCount &&
!GpeEventInfo->DisableForDispatch)
{
(void) AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_ENABLE);
}
}
return_ACPI_STATUS (AE_OK);
}
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 EnableMask bit is set
* in the EventInfo.
*/
(void) AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_CONDITIONAL_ENABLE);
return (AE_OK);
}
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);
}
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);
}
ACPI_STATUS
AcpiDisableGpe (
ACPI_HANDLE GpeDevice,
UINT32 GpeNumber)
{
ACPI_STATUS Status = AE_OK;
ACPI_GPE_EVENT_INFO *GpeEventInfo;
ACPI_CPU_FLAGS Flags;
ACPI_FUNCTION_TRACE (AcpiDisableGpe);
Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
/* Ensure that we have a valid GPE number */
GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
if (!GpeEventInfo)
{
Status = AE_BAD_PARAMETER;
goto UnlockAndExit;
}
/* Hardware-disable a runtime GPE on removal of the last reference */
if (!GpeEventInfo->RuntimeCount)
{
Status = AE_LIMIT; /* There are no references to remove */
goto UnlockAndExit;
}
GpeEventInfo->RuntimeCount--;
if (!GpeEventInfo->RuntimeCount)
{
Status = AcpiEvUpdateGpeEnableMask (GpeEventInfo);
if (ACPI_SUCCESS (Status))
{
Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE);
}
if (ACPI_FAILURE (Status))
{
GpeEventInfo->RuntimeCount++;
}
}
UnlockAndExit:
AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
return_ACPI_STATUS (Status);
}
ACPI_STATUS
AcpiEvEnableGpe (
ACPI_GPE_EVENT_INFO *GpeEventInfo)
{
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (EvEnableGpe);
/* 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);
}
UINT32
AcpiEvGpeDispatch (
ACPI_NAMESPACE_NODE *GpeDevice,
ACPI_GPE_EVENT_INFO *GpeEventInfo,
UINT32 GpeNumber)
{
ACPI_STATUS Status;
UINT32 ReturnValue;
ACPI_FUNCTION_TRACE (EvGpeDispatch);
/*
* 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);
}
/*
* 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));
(void) AcpiHwLowSetGpe (
GpeEventInfo, ACPI_GPE_CONDITIONAL_ENABLE);
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 (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags))
{
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);
}
ACPI_STATUS
AcpiEvMatchGpeMethod (
ACPI_HANDLE ObjHandle,
UINT32 Level,
void *Context,
void **ReturnValue)
{
ACPI_NAMESPACE_NODE *MethodNode = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjHandle);
ACPI_GPE_WALK_INFO *WalkInfo = ACPI_CAST_PTR (ACPI_GPE_WALK_INFO, Context);
ACPI_GPE_EVENT_INFO *GpeEventInfo;
UINT32 GpeNumber;
char Name[ACPI_NAME_SIZE + 1];
UINT8 Type;
ACPI_FUNCTION_TRACE (EvMatchGpeMethod);
/* Check if requested OwnerId matches this OwnerId */
if ((WalkInfo->ExecuteByOwnerId) &&
(MethodNode->OwnerId != WalkInfo->OwnerId))
{
return_ACPI_STATUS (AE_OK);
}
/*
* Match and decode the _Lxx and _Exx GPE method names
*
* 1) Extract the method name and null terminate it
*/
ACPI_MOVE_32_TO_32 (Name, &MethodNode->Name.Integer);
Name[ACPI_NAME_SIZE] = 0;
/* 2) Name must begin with an underscore */
if (Name[0] != '_')
{
return_ACPI_STATUS (AE_OK); /* Ignore this method */
}
/*
* 3) Edge/Level determination is based on the 2nd character
* of the method name
*/
switch (Name[1])
{
case 'L':
Type = ACPI_GPE_LEVEL_TRIGGERED;
break;
case 'E':
Type = ACPI_GPE_EDGE_TRIGGERED;
break;
default:
/* Unknown method type, just ignore it */
ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,
"Ignoring unknown GPE method type: %s "
"(name not of form _Lxx or _Exx)", Name));
return_ACPI_STATUS (AE_OK);
}
/* 4) The last two characters of the name are the hex GPE Number */
GpeNumber = strtoul (&Name[2], NULL, 16);
if (GpeNumber == ACPI_UINT32_MAX)
{
/* Conversion failed; invalid method, just ignore it */
ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,
"Could not extract GPE number from name: %s "
"(name is not of form _Lxx or _Exx)", Name));
return_ACPI_STATUS (AE_OK);
}
/* Ensure that we have a valid GPE number for this GPE block */
GpeEventInfo = AcpiEvLowGetGpeInfo (GpeNumber, WalkInfo->GpeBlock);
if (!GpeEventInfo)
{
/*
* This GpeNumber is not valid for this GPE block, just ignore it.
* However, it may be valid for a different GPE block, since GPE0
* and GPE1 methods both appear under \_GPE.
*/
return_ACPI_STATUS (AE_OK);
}
if ((ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) ==
ACPI_GPE_DISPATCH_HANDLER) ||
(ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) ==
ACPI_GPE_DISPATCH_RAW_HANDLER))
{
/* If there is already a handler, ignore this GPE method */
return_ACPI_STATUS (AE_OK);
}
if (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) ==
ACPI_GPE_DISPATCH_METHOD)
{
/*
* If there is already a method, ignore this method. But check
* for a type mismatch (if both the _Lxx AND _Exx exist)
*/
if (Type != (GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK))
{
ACPI_ERROR ((AE_INFO,
"For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods",
GpeNumber, GpeNumber, GpeNumber));
}
return_ACPI_STATUS (AE_OK);
}
/* Disable the GPE in case it's been enabled already. */
(void) AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE);
/*
* Add the GPE information from above to the GpeEventInfo block for
* use during dispatch of this GPE.
*/
GpeEventInfo->Flags &= ~(ACPI_GPE_DISPATCH_MASK);
GpeEventInfo->Flags |= (UINT8) (Type | ACPI_GPE_DISPATCH_METHOD);
GpeEventInfo->Dispatch.MethodNode = MethodNode;
ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,
"Registered GPE method %s as GPE number 0x%.2X\n",
Name, GpeNumber));
return_ACPI_STATUS (AE_OK);
}