ACPI_STATUS
AcpiFinishGpe (
ACPI_HANDLE GpeDevice,
UINT32 GpeNumber)
{
ACPI_GPE_EVENT_INFO *GpeEventInfo;
ACPI_STATUS Status;
ACPI_CPU_FLAGS Flags;
ACPI_FUNCTION_TRACE (AcpiFinishGpe);
Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
/* Ensure that we have a valid GPE number */
GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
if (!GpeEventInfo)
{
Status = AE_BAD_PARAMETER;
goto UnlockAndExit;
}
Status = AcpiEvFinishGpe (GpeEventInfo);
UnlockAndExit:
AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
return_ACPI_STATUS (Status);
}
static void ACPI_SYSTEM_XFACE
AcpiEvAsynchEnableGpe (
void *Context)
{
ACPI_GPE_EVENT_INFO *GpeEventInfo = Context;
(void) AcpiEvFinishGpe (GpeEventInfo);
ACPI_FREE (GpeEventInfo);
return;
}
static void ACPI_SYSTEM_XFACE
AcpiEvAsynchEnableGpe (
void *Context)
{
ACPI_GPE_EVENT_INFO *GpeEventInfo = Context;
ACPI_CPU_FLAGS Flags;
Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
(void) AcpiEvFinishGpe (GpeEventInfo);
AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
return;
}
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);
}
