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windows-nt/Source/XPSP1/NT/base/busdrv/acpi/ec/eclowio.c

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2020-09-26 03:20:57 -05:00
/*++
Copyright (c) 1990 Microsoft Corporation
Module Name:
eclowio.c
Abstract:
Interface module to ACPI driver functions. It encapsulates the grungy Irp details.
Author:
Bob Moore (Intel)
Environment:
Notes:
Revision History:
00-Feb-15 [vincentg] - modified to use oprghdlr.sys to register/deregister
op region handler
--*/
#include "ecp.h"
#include "oprghdlr.h"
#include <initguid.h>
#include <wdmguid.h>
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, AcpiEcGetAcpiInterfaces)
#pragma alloc_text(PAGE, AcpiEcGetGpeVector)
#pragma alloc_text(PAGE, AcpiEcInstallOpRegionHandler)
#pragma alloc_text(PAGE, AcpiEcRemoveOpRegionHandler)
#endif
NTSTATUS
AcpiEcGetAcpiInterfaces (
IN PECDATA EcData
)
/*++
Routine Description:
Call ACPI driver to get the direct-call interfaces.
Arguments:
EcData - Pointer to the EC driver device extension
Return Value:
Status is returned.
--*/
{
KEVENT event;
IO_STATUS_BLOCK ioStatus;
NTSTATUS status;
PIRP irp;
PIO_STACK_LOCATION irpSp;
PAGED_CODE();
//
// Initialize an event to block on
//
KeInitializeEvent( &event, SynchronizationEvent, FALSE );
//
// Build an irp
//
irp = IoBuildSynchronousFsdRequest(
IRP_MJ_PNP,
EcData->LowerDeviceObject,
NULL,
0,
NULL,
&event,
&ioStatus
);
if (!irp) {
return STATUS_INSUFFICIENT_RESOURCES;
}
irp->IoStatus.Status = STATUS_NOT_SUPPORTED;
irp->IoStatus.Information = 0;
//
// Get the the current irp location
//
irpSp = IoGetNextIrpStackLocation( irp );
//
// Use QUERY_INTERFACE to get the address of the direct-call
// ACPI interfaces.
//
irpSp->MajorFunction = IRP_MJ_PNP;
irpSp->MinorFunction = IRP_MN_QUERY_INTERFACE;
irpSp->Parameters.QueryInterface.InterfaceType = (LPGUID) &GUID_ACPI_INTERFACE_STANDARD;
irpSp->Parameters.QueryInterface.Version = 1;
irpSp->Parameters.QueryInterface.Size = sizeof (AcpiInterfaces);
irpSp->Parameters.QueryInterface.Interface = (PINTERFACE) &AcpiInterfaces;
irpSp->Parameters.QueryInterface.InterfaceSpecificData = NULL;
//
// send the request down
//
status = IoCallDriver( EcData->LowerDeviceObject, irp );
if (status == STATUS_PENDING) {
KeWaitForSingleObject( &event, Executive, KernelMode, FALSE, NULL );
status = ioStatus.Status;
}
//
// Done
//
return status;
}
NTSTATUS
AcpiEcGetGpeVector (
IN PECDATA EcData
)
/*++
Routine Description:
Run the _GPE method (Under the EC device in the namespace) to get the
GPE vector assigned to the EC.
Note: This routine is called at PASSIVE_LEVEL
Arguments:
EcData - Pointer to the EC driver device extension
Return Value:
Status is returned.
--*/
{
ACPI_EVAL_INPUT_BUFFER inputBuffer;
ACPI_EVAL_OUTPUT_BUFFER outputBuffer;
KEVENT event;
IO_STATUS_BLOCK ioStatus;
NTSTATUS status;
PACPI_METHOD_ARGUMENT argument;
PIRP irp;
PAGED_CODE();
//
// Initialize the event
//
KeInitializeEvent( &event, SynchronizationEvent, FALSE );
//
// Initialize the input buffer
//
RtlZeroMemory( &inputBuffer, sizeof(ACPI_EVAL_INPUT_BUFFER) );
inputBuffer.Signature = ACPI_EVAL_INPUT_BUFFER_SIGNATURE;
inputBuffer.MethodNameAsUlong = CM_GPE_METHOD;
//
// Initialize the output buffer
//
RtlZeroMemory( &outputBuffer, sizeof(ACPI_EVAL_OUTPUT_BUFFER ) );
//
// Initialize an IRP
//
irp = IoBuildDeviceIoControlRequest(
IOCTL_ACPI_EVAL_METHOD,
EcData->LowerDeviceObject,
&inputBuffer,
sizeof(ACPI_EVAL_INPUT_BUFFER),
&outputBuffer,
sizeof(ACPI_EVAL_OUTPUT_BUFFER),
FALSE,
&event,
&ioStatus
);
//
// Irp initialization failed?
//
if (!irp) {
status = STATUS_INSUFFICIENT_RESOURCES;
goto AcpiEcGetGpeVectorExit;
}
//
// Send to ACPI driver
//
status = IoCallDriver (EcData->LowerDeviceObject, irp);
if (status == STATUS_PENDING) {
//
// Wait for request to be completed
//
KeWaitForSingleObject( &event, Executive, KernelMode, FALSE, NULL );
//
// Get the real status
//
status = ioStatus.Status;
}
//
// Did we fail the request?
//
if (!NT_SUCCESS(status)) {
goto AcpiEcGetGpeVectorExit;
}
//
// Sanity checks
//
ASSERT( ioStatus.Information >= sizeof(ACPI_EVAL_OUTPUT_BUFFER) );
if (ioStatus.Information < sizeof(ACPI_EVAL_OUTPUT_BUFFER) ||
outputBuffer.Signature != ACPI_EVAL_OUTPUT_BUFFER_SIGNATURE ||
outputBuffer.Count == 0) {
status = STATUS_UNSUCCESSFUL;
goto AcpiEcGetGpeVectorExit;
}
//
// Crack the result
//
argument = &(outputBuffer.Argument[0]);
//
// We are expecting an integer
//
if (argument->Type != ACPI_METHOD_ARGUMENT_INTEGER) {
status = STATUS_ACPI_INVALID_DATA;
goto AcpiEcGetGpeVectorExit;
}
//
// Get the value
//
EcData->GpeVector = (UCHAR) argument->Argument;
AcpiEcGetGpeVectorExit:
//
// Done
//
return status;
}
NTSTATUS
AcpiEcConnectGpeVector (
IN PECDATA EcData
)
/*++
Routine Description:
Call ACPI driver to connect the EC driver to a GPE vector
Arguments:
EcData - Pointer to the EC driver device extension
Return Value:
Status is returned.
--*/
{
return (AcpiInterfaces.GpeConnectVector (
AcpiInterfaces.Context,
EcData->GpeVector,
Latched, // Edge triggered
FALSE, // Can't be shared
AcpiEcGpeServiceRoutine,
EcData,
&EcData->GpeVectorObject));
}
NTSTATUS
AcpiEcDisconnectGpeVector (
IN PECDATA EcData
)
/*++
Routine Description:
Call ACPI driver to disconnect the EC driver from a GPE vector. Called
from device unload, stop.
Arguments:
EcData - Pointer to the EC driver device extension
Return Value:
Status is returned.
--*/
{
NTSTATUS status;
if (EcData->GpeVectorObject) {
status = AcpiInterfaces.GpeDisconnectVector (EcData->GpeVectorObject);
EcData->GpeVectorObject = NULL;
} else {
status = STATUS_SUCCESS;
}
return status;
}
NTSTATUS
AcpiEcInstallOpRegionHandler(
IN PECDATA EcData
)
/*++
Routine Description:
Call ACPI driver to install the EC driver operation region handler
Arguments:
EcData - Pointer to the EC driver device extension
Return Value:
Status is returned.
--*/
{
NTSTATUS status = STATUS_SUCCESS;
PAGED_CODE ();
status = RegisterOpRegionHandler (EcData->LowerDeviceObject,
ACPI_OPREGION_ACCESS_AS_COOKED,
ACPI_OPREGION_REGION_SPACE_EC,
(PACPI_OP_REGION_HANDLER) AcpiEcOpRegionHandler,
EcData,
0,
&EcData->OperationRegionObject);
return status;
}
NTSTATUS
AcpiEcRemoveOpRegionHandler (
IN PECDATA EcData
)
/*++
Routine Description:
Call ACPI driver to remove the EC driver operation region handler.
Called from device unload, stop.
Arguments:
EcData - Pointer to the EC driver device extension
Return Value:
Status is returned.
--*/
{
NTSTATUS status = STATUS_SUCCESS;
PAGED_CODE ();
status = DeRegisterOpRegionHandler (EcData->LowerDeviceObject,
EcData->OperationRegionObject);
return status;
}
NTSTATUS
AcpiEcForwardIrpAndWait (
IN PECDATA EcData,
IN PIRP Irp
)
/*++
Routine Description:
Utility routine to send an irp down, and wait for the result.
Arguments:
EcData - Pointer to the EC driver device extension
Irp - Irp to send and complete
Return Value:
Status is returned.
--*/
{
KEVENT pdoStartedEvent;
NTSTATUS status;
KeInitializeEvent (&pdoStartedEvent, SynchronizationEvent, FALSE);
IoCopyCurrentIrpStackLocationToNext (Irp);
IoSetCompletionRoutine (Irp, AcpiEcIoCompletion, &pdoStartedEvent,
TRUE, TRUE, TRUE);
//
// Always wait for the completion routine
//
status = IoCallDriver (EcData->LowerDeviceObject, Irp);
if (status == STATUS_PENDING) {
KeWaitForSingleObject (&pdoStartedEvent, Executive, KernelMode, FALSE, NULL);
status = Irp->IoStatus.Status;
}
return status;
}
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