ACPI_STATUS
AcpiEnableGpe (
ACPI_HANDLE GpeDevice,
UINT32 GpeNumber,
UINT8 GpeType)
{
ACPI_STATUS Status = AE_OK;
ACPI_GPE_EVENT_INFO *GpeEventInfo;
ACPI_CPU_FLAGS Flags;
ACPI_FUNCTION_TRACE (AcpiEnableGpe);
/* Parameter validation */
if (!GpeType || (GpeType & ~ACPI_GPE_TYPE_WAKE_RUN))
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
/* Ensure that we have a valid GPE number */
GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
if (!GpeEventInfo)
{
Status = AE_BAD_PARAMETER;
goto UnlockAndExit;
}
if (GpeType & ACPI_GPE_TYPE_RUNTIME)
{
if (GpeEventInfo->RuntimeCount == ACPI_UINT8_MAX)
{
Status = AE_LIMIT; /* Too many references */
goto UnlockAndExit;
}
GpeEventInfo->RuntimeCount++;
if (GpeEventInfo->RuntimeCount == 1)
{
Status = AcpiEvEnableGpe (GpeEventInfo);
if (ACPI_FAILURE (Status))
{
GpeEventInfo->RuntimeCount--;
goto UnlockAndExit;
}
}
}
if (GpeType & ACPI_GPE_TYPE_WAKE)
{
/* The GPE must have the ability to wake the system */
if (!(GpeEventInfo->Flags & ACPI_GPE_CAN_WAKE))
{
Status = AE_TYPE;
goto UnlockAndExit;
}
if (GpeEventInfo->WakeupCount == ACPI_UINT8_MAX)
{
Status = AE_LIMIT; /* Too many references */
goto UnlockAndExit;
}
/*
* Update the enable mask on the first wakeup reference. Wake GPEs
* are only hardware-enabled just before sleeping.
*/
GpeEventInfo->WakeupCount++;
if (GpeEventInfo->WakeupCount == 1)
{
(void) AcpiEvUpdateGpeEnableMasks (GpeEventInfo);
}
}
UnlockAndExit:
AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
return_ACPI_STATUS (Status);
}
ACPI_STATUS
AcpiDisableGpe (
ACPI_HANDLE GpeDevice,
UINT32 GpeNumber,
UINT8 GpeType)
{
ACPI_STATUS Status = AE_OK;
ACPI_GPE_EVENT_INFO *GpeEventInfo;
ACPI_CPU_FLAGS Flags;
ACPI_FUNCTION_TRACE (AcpiDisableGpe);
/* Parameter validation */
if (!GpeType || (GpeType & ~ACPI_GPE_TYPE_WAKE_RUN))
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
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 (GpeType & ACPI_GPE_TYPE_RUNTIME)
{
if (!GpeEventInfo->RuntimeCount)
{
Status = AE_LIMIT; /* There are no references to remove */
goto UnlockAndExit;
}
GpeEventInfo->RuntimeCount--;
if (!GpeEventInfo->RuntimeCount)
{
Status = AcpiEvDisableGpe (GpeEventInfo);
if (ACPI_FAILURE (Status))
{
GpeEventInfo->RuntimeCount++;
goto UnlockAndExit;
}
}
}
/*
* Update masks for wake GPE on removal of the last reference.
* No need to hardware-disable wake GPEs here, they are not currently
* enabled.
*/
if (GpeType & ACPI_GPE_TYPE_WAKE)
{
if (!GpeEventInfo->WakeupCount)
{
Status = AE_LIMIT; /* There are no references to remove */
goto UnlockAndExit;
}
GpeEventInfo->WakeupCount--;
if (!GpeEventInfo->WakeupCount)
{
(void) AcpiEvUpdateGpeEnableMasks (GpeEventInfo);
}
}
UnlockAndExit:
AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
return_ACPI_STATUS (Status);
}
static ACPI_STATUS
AcpiEvMatchPrwAndGpe (
ACPI_HANDLE ObjHandle,
UINT32 Level,
void *Info,
void **ReturnValue)
{
ACPI_GPE_WALK_INFO *GpeInfo = (void *) Info;
ACPI_NAMESPACE_NODE *GpeDevice;
ACPI_GPE_BLOCK_INFO *GpeBlock;
ACPI_NAMESPACE_NODE *TargetGpeDevice;
ACPI_GPE_EVENT_INFO *GpeEventInfo;
ACPI_OPERAND_OBJECT *PkgDesc;
ACPI_OPERAND_OBJECT *ObjDesc;
UINT32 GpeNumber;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (EvMatchPrwAndGpe);
/* Check for a _PRW method under this device */
Status = AcpiUtEvaluateObject (ObjHandle, METHOD_NAME__PRW,
ACPI_BTYPE_PACKAGE, &PkgDesc);
if (ACPI_FAILURE (Status))
{
/* Ignore all errors from _PRW, we don't want to abort the subsystem */
return_ACPI_STATUS (AE_OK);
}
/* The returned _PRW package must have at least two elements */
if (PkgDesc->Package.Count < 2)
{
goto Cleanup;
}
/* Extract pointers from the input context */
GpeDevice = GpeInfo->GpeDevice;
GpeBlock = GpeInfo->GpeBlock;
/*
* The _PRW object must return a package, we are only interested in the
* first element
*/
ObjDesc = PkgDesc->Package.Elements[0];
if (ObjDesc->Common.Type == ACPI_TYPE_INTEGER)
{
/* Use FADT-defined GPE device (from definition of _PRW) */
TargetGpeDevice = AcpiGbl_FadtGpeDevice;
/* Integer is the GPE number in the FADT described GPE blocks */
GpeNumber = (UINT32) ObjDesc->Integer.Value;
}
else if (ObjDesc->Common.Type == ACPI_TYPE_PACKAGE)
{
/* Package contains a GPE reference and GPE number within a GPE block */
if ((ObjDesc->Package.Count < 2) ||
((ObjDesc->Package.Elements[0])->Common.Type !=
ACPI_TYPE_LOCAL_REFERENCE) ||
((ObjDesc->Package.Elements[1])->Common.Type !=
ACPI_TYPE_INTEGER))
{
goto Cleanup;
}
/* Get GPE block reference and decode */
TargetGpeDevice = ObjDesc->Package.Elements[0]->Reference.Node;
GpeNumber = (UINT32) ObjDesc->Package.Elements[1]->Integer.Value;
}
else
{
/* Unknown type, just ignore it */
goto Cleanup;
}
/*
* Is this GPE within this block?
*
* TRUE if and only if these conditions are true:
* 1) The GPE devices match.
* 2) The GPE index(number) is within the range of the Gpe Block
* associated with the GPE device.
*/
if ((GpeDevice == TargetGpeDevice) &&
(GpeNumber >= GpeBlock->BlockBaseNumber) &&
(GpeNumber < GpeBlock->BlockBaseNumber +
(GpeBlock->RegisterCount * 8)))
{
GpeEventInfo = &GpeBlock->EventInfo[GpeNumber -
GpeBlock->BlockBaseNumber];
/* Mark GPE for WAKE-ONLY but WAKE_DISABLED */
GpeEventInfo->Flags &= ~(ACPI_GPE_WAKE_ENABLED | ACPI_GPE_RUN_ENABLED);
Status = AcpiEvSetGpeType (GpeEventInfo, ACPI_GPE_TYPE_WAKE);
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
Status = AcpiEvUpdateGpeEnableMasks (GpeEventInfo, ACPI_GPE_DISABLE);
}
Cleanup:
AcpiUtRemoveReference (PkgDesc);
return_ACPI_STATUS (AE_OK);
}
