68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
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/*++
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Copyright (c) 1996 Microsoft Corporation
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Module Name:
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physdesc.c
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Abstract
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Get-friendly-name handling routines
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Author:
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Ervin P.
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Environment:
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Kernel mode only
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Revision History:
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--*/
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#include "pch.h"
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/*
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********************************************************************************
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* HidpGetPhysicalDescriptor
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********************************************************************************
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*
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* Note: This function cannot be pageable because it is called
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* from the IOCTL dispatch routine, which can get called
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* at DISPATCH_LEVEL.
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*
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*/
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NTSTATUS HidpGetPhysicalDescriptor(IN PHIDCLASS_DEVICE_EXTENSION HidDeviceExtension, IN OUT PIRP Irp)
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{
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FDO_EXTENSION *fdoExt;
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NTSTATUS status;
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PIO_STACK_LOCATION currentIrpSp, nextIrpSp;
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ASSERT(HidDeviceExtension->isClientPdo);
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fdoExt = &HidDeviceExtension->pdoExt.deviceFdoExt->fdoExt;
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/*
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* IOCTL_GET_PHYSICAL_DESCRIPTOR uses buffering method
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* METHOD_OUT_DIRECT, meaning that the buffer is in
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* the MDL specified by Irp->MdlAddress. We'll just
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* pass this down and let the lower driver extract the
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* system address.
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*/
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currentIrpSp = IoGetCurrentIrpStackLocation(Irp);
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nextIrpSp = IoGetNextIrpStackLocation(Irp);
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nextIrpSp->MajorFunction = IRP_MJ_INTERNAL_DEVICE_CONTROL;
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nextIrpSp->Parameters.DeviceIoControl.IoControlCode = IOCTL_GET_PHYSICAL_DESCRIPTOR;
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nextIrpSp->Parameters.DeviceIoControl.OutputBufferLength = currentIrpSp->Parameters.DeviceIoControl.OutputBufferLength;
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status = HidpCallDriver(fdoExt->fdo, Irp);
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DBGSUCCESS(status, FALSE)
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return status;
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}
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