ACPI_STATUS
AcpiEnableGpe (
ACPI_HANDLE GpeDevice,
UINT32 GpeNumber)
{
ACPI_STATUS Status = AE_BAD_PARAMETER;
ACPI_GPE_EVENT_INFO *GpeEventInfo;
ACPI_CPU_FLAGS Flags;
ACPI_FUNCTION_TRACE (AcpiEnableGpe);
Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
/*
* Ensure that we have a valid GPE number and that there is some way
* of handling the GPE (handler or a GPE method). In other words, we
* won't allow a valid GPE to be enabled if there is no way to handle it.
*/
GpeEventInfo = AcpiEvGetGpeEventInfo (GpeDevice, GpeNumber);
if (GpeEventInfo)
{
if (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) !=
ACPI_GPE_DISPATCH_NONE)
{
Status = AcpiEvAddGpeReference (GpeEventInfo);
if (ACPI_SUCCESS (Status) &&
ACPI_GPE_IS_POLLING_NEEDED (GpeEventInfo))
{
/* Poll edge-triggered GPEs to handle existing events */
AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
(void) AcpiEvDetectGpe (
GpeDevice, GpeEventInfo, GpeNumber);
Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
}
}
else
{
Status = AE_NO_HANDLER;
}
}
AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
return_ACPI_STATUS (Status);
}
ACPI_STATUS
AcpiEvInitializeGpeBlock (
ACPI_GPE_XRUPT_INFO *GpeXruptInfo,
ACPI_GPE_BLOCK_INFO *GpeBlock,
void *Context)
{
ACPI_STATUS Status;
ACPI_GPE_EVENT_INFO *GpeEventInfo;
UINT32 GpeEnabledCount;
UINT32 GpeIndex;
UINT32 i;
UINT32 j;
BOOLEAN *IsPollingNeeded = Context;
ACPI_ERROR_ONLY (UINT32 GpeNumber);
ACPI_FUNCTION_TRACE (EvInitializeGpeBlock);
/*
* Ignore a null GPE block (e.g., if no GPE block 1 exists), and
* any GPE blocks that have been initialized already.
*/
if (!GpeBlock || GpeBlock->Initialized)
{
return_ACPI_STATUS (AE_OK);
}
/*
* Enable all GPEs that have a corresponding method and have the
* ACPI_GPE_CAN_WAKE flag unset. Any other GPEs within this block
* must be enabled via the acpi_enable_gpe() interface.
*/
GpeEnabledCount = 0;
for (i = 0; i < GpeBlock->RegisterCount; i++)
{
for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++)
{
/* Get the info block for this particular GPE */
GpeIndex = (i * ACPI_GPE_REGISTER_WIDTH) + j;
GpeEventInfo = &GpeBlock->EventInfo[GpeIndex];
ACPI_ERROR_ONLY(GpeNumber = GpeBlock->BlockBaseNumber + GpeIndex);
GpeEventInfo->Flags |= ACPI_GPE_INITIALIZED;
/*
* Ignore GPEs that have no corresponding _Lxx/_Exx method
* and GPEs that are used to wake the system
*/
if ((ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) != ACPI_GPE_DISPATCH_METHOD) ||
(GpeEventInfo->Flags & ACPI_GPE_CAN_WAKE))
{
continue;
}
Status = AcpiEvAddGpeReference (GpeEventInfo);
if (ACPI_FAILURE (Status))
{
ACPI_EXCEPTION ((AE_INFO, Status,
"Could not enable GPE 0x%02X",
GpeNumber));
continue;
}
GpeEventInfo->Flags |= ACPI_GPE_AUTO_ENABLED;
if (IsPollingNeeded &&
ACPI_GPE_IS_POLLING_NEEDED (GpeEventInfo))
{
*IsPollingNeeded = TRUE;
}
GpeEnabledCount++;
}
}
if (GpeEnabledCount)
{
ACPI_INFO ((
"Enabled %u GPEs in block %02X to %02X", GpeEnabledCount,
(UINT32) GpeBlock->BlockBaseNumber,
(UINT32) (GpeBlock->BlockBaseNumber + (GpeBlock->GpeCount - 1))));
}
GpeBlock->Initialized = TRUE;
return_ACPI_STATUS (AE_OK);
}