diff -r 2f92ad2dc5db -r 1df514389a47 kernel/eka/drivers/usbho/usbdi_utils/usbinterface.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/kernel/eka/drivers/usbho/usbdi_utils/usbinterface.cpp	Wed Apr 14 17:22:59 2010 +0300
@@ -0,0 +1,154 @@
+// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of the License "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+//
+
+#include <d32usbdi.h>
+
+#include <d32usbtransfers.h>
+#include "usbtransferstrategy.h"
+#include "zerocopytransferstrategy.h"
+
+
+/**
+Opens an interface identified by a token.  When the hub driver loads a driver (via function driver
+framework), this token is generated to allow the driver to open the interface.
+
+This also causes the interface's descriptors to be parsed for future reference.
+
+@param[in] aToken The token for the interface to open.
+@return System-wide error code.
+*/
+EXPORT_C TInt RUsbInterface::Open(TUint32 aToken, TOwnerType aType)
+	{
+	TPckgC<TUint32> token(aToken);
+	TInt err = DoCreate(Name(), VersionRequired(), KNullUnit, NULL, &token, aType);
+	if(err == KErrNone)
+		{
+		// Create a transfer strategy
+		iTransferStrategy = new RUsbZeroCopyTransferStrategy;
+		if(!iTransferStrategy)
+			{
+			Close();
+			return KErrNoMemory;
+			}
+
+		// Get descriptor size
+		TInt interfaceDescSize = 0;
+		err = DoControl(EGetInterfaceDescriptorSize, &interfaceDescSize);
+		if(err != KErrNone)
+			{
+			Close();
+			return err;
+			}
+		iInterfaceDescriptorData = HBufC8::New(interfaceDescSize);
+
+		if(!iInterfaceDescriptorData)
+			{
+			Close();
+			return KErrNoMemory;
+			}
+
+		// Get descriptor data
+		TPtr8 interfaceDesc = iInterfaceDescriptorData->Des();
+		err = DoControl(EGetInterfaceDescriptor, &interfaceDesc);
+		if(err != KErrNone)
+			{
+			Close();
+			return err;
+			}
+
+		// Parse descriptor
+		TUsbGenericDescriptor* parsed = NULL;
+		err = UsbDescriptorParser::Parse(*iInterfaceDescriptorData, parsed);
+		if(err != KErrNone)
+			{
+			if(parsed)
+				{
+				parsed->DestroyTree(); //or however much has been completed
+				delete parsed;
+				}
+			Close();
+			return err;
+			}
+
+		iHeadInterfaceDescriptor = TUsbInterfaceDescriptor::Cast(parsed);
+		if(!iHeadInterfaceDescriptor)
+			{
+			if(parsed)
+				{
+				parsed->DestroyTree();
+				delete parsed;
+				}
+			Close();
+			return KErrCorrupt;
+			}
+		}
+
+	return err;
+	}
+	
+/**
+Close handle to interface.
+
+Closes any pipe handles still open.
+*/
+EXPORT_C void RUsbInterface::Close()
+	{
+	iAlternateSetting = 0;
+	if(iHeadInterfaceDescriptor)
+		{
+		iHeadInterfaceDescriptor->DestroyTree();
+		delete iHeadInterfaceDescriptor;
+		iHeadInterfaceDescriptor = NULL;
+		}
+	if(iInterfaceDescriptorData)
+		{
+		delete iInterfaceDescriptorData;
+		iInterfaceDescriptorData = NULL;
+		}
+	if(iTransferStrategy)
+		{
+		iTransferStrategy->Close();
+		delete iTransferStrategy;
+		iTransferStrategy = NULL;
+		}
+	RBusLogicalChannel::Close();
+	}
+
+
+EXPORT_C TInt RUsbInterface::RegisterTransferDescriptor(RUsbTransferDescriptor& aTransfer)
+	{
+	TTransferMemoryDetails details;
+	details.iType		= aTransfer.iType;
+	details.iSize		= aTransfer.iMaxSize;
+	details.iMaxPackets	= aTransfer.iMaxNumPackets;
+	TInt err = DoControl(EGetSizeAndAlignment, &details);
+	if(err != KErrNone)
+		{
+		return err;
+		}
+	return iTransferStrategy->RegisterTransferDescriptor(aTransfer, details.iSize, details.iAlignment, details.iMaxPackets);
+	}
+	
+EXPORT_C void RUsbInterface::ResetTransferDescriptors()
+	{
+	iTransferStrategy->ResetTransferDescriptors();
+	}
+
+EXPORT_C TInt RUsbInterface::InitialiseTransferDescriptors()
+	{
+	return iTransferStrategy->InitialiseTransferDescriptors(*this);
+	}
+
+