Adaptation/GUID-2D977A02-5928-5441-8AE7-42A722F2A4B8.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
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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-2D977A02-5928-5441-8AE7-42A722F2A4B8" xml:lang="en"><title>User-Side Hardware Abstraction</title><shortdesc>The User-Side Hardware Abstraction (HAL) component provides a simple
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interface for programs to read and set hardware-specific settings, for example,
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the display contrast. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>A base port must define the attributes that clients can use on a phone,
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and implement any functions that are required to get and set the attributes.</p>
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<p id="GUID-4DA41221-40B9-5BC7-B2C6-7C6EB4522508"> To define attributes, you
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must change the source of the <filepath>hal.dll</filepath> library and rebuild
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it. Functions that get and set attributes are implemented as HAL handler functions
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in kernel-side programs, for example, device drivers. </p>
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</conbody><related-links>
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<link href="GUID-8C22AF20-EE0E-5AD2-BEFD-FED5A7DBB09B.dita"><linktext>LCD   Extension</linktext>
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</link>
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<link href="GUID-54042C84-6216-5930-9CBF-BAF635CECD4D.dita"><linktext>Power HAL
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  Handler</linktext></link>
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</related-links></concept>