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Adaptation/GUID-30978E00-D244-44CD-8F4E-9676DF172A52.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
changeset 15 307f4279f433
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License
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"Eclipse Public License v1.0" which accompanies this distribution,
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors:
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-30978E00-D244-44CD-8F4E-9676DF172A52" xml:lang="en"><title>Driver-side
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Handling</title><shortdesc>This document describes how device drivers handle asynchronous
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requests.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>Drivers generally implement the <xref href="GUID-9D910016-5611-30DD-A139-EE46705A4912.dita"><apiname>DoRequest()</apiname></xref> function
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in the LDD to handle the received asynchronous messages. </p>
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<p>The implementation reads the request type and other passed arguments, and
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initiates handling of the request appropriately. </p>
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<p>The return value of this function only indicates the status of the message
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reception to the driver. It does not actually indicate the request completion
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result. </p>
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<codeblock id="GUID-335BB3F8-7B2B-5FC4-A8D1-204E6B24FECD" xml:space="preserve">TInt DExDriverLogicalChannel::DoRequest(TInt aReqNo, TRequestStatus* aStatus,
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        TAny* a1, TAny* a2)
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    {
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    switch (aReqNo)
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        {
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        case RExDriverChannel::ERequestTransmitData:
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            // Call TransmitData function
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            r = TransmitData ((const TDesC8*)a1);
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            // The status object is stored
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            // to be used when notifying the completion of the
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            // request at a later point.
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            //
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            iTxDataStatus = aStatus;
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            break;
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        }
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    return r;
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    }</codeblock>
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</conbody></concept>
MCL/sftools/depl/docscontent