author | William Roberts <williamr@symbian.org> |
Tue, 16 Mar 2010 16:12:26 +0000 | |
branch | Symbian2 |
changeset 2 | 2fe1408b6811 |
child 4 | 837f303aceeb |
permissions | -rw-r--r-- |
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// Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.symbianfoundation.org/legal/licencesv10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// hal\inc\hal.h |
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// |
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// |
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#ifndef __HAL_H__ |
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#define __HAL_H__ |
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#include <e32def.h> |
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#include <hal_data.h> |
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#include <e32property.h> |
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/** |
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@publishedPartner |
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@released |
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A set of static functions to get and set hardware attributes. |
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@see HALData |
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class HAL : public HALData |
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{ |
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public: |
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/** |
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Synonyms for the attribute properties |
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HALData::TAttributeProperty, and used in SEntry. |
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*/ |
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enum TEntryProperty |
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{ |
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/** |
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When set, means that an attribute is meaningful on this device. |
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*/ |
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EEntryValid=0x1, |
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/** |
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When set, means that an attribute is modifiable. |
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*/ |
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EEntryDynamic=0x2, |
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}; |
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/** |
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Defines an entry in the array that is returned in a call to HAL::GetAll(). |
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*/ |
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struct SEntry |
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{ |
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/** |
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The properties of the attribute. |
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@see HAL::TEntryProperty |
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*/ |
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TInt iProperties; |
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/** |
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The attribute value. |
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@see HALData::TAttribute |
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*/ |
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TInt iValue; |
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}; |
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public: |
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/** |
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Gets the value of the specified HAL attribute. |
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@param aAttribute The HAL attribute. |
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@param aValue On successful return, contains the attribute value. |
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Some attributes may accept aValue as an input as well, to select |
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one of several alternate values. See the documentation for the |
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individual HAL attributes for details of this. |
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@return KErrNone, if successful; |
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KErrNotSupported, if the attribute is not defined in the list |
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of attributes, or is not meaningful for this device. |
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KErrArgument, if aValue was invalid (for attributes |
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which take an argument). |
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@see HALData::TAttribute |
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@see HALData::TAttributeProperty |
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*/ |
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IMPORT_C static TInt Get(TAttribute aAttribute, TInt& aValue); |
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/** |
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Sets the specified HAL attribute. |
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@param aAttribute The HAL attribute. |
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@param aValue The attribute value. |
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@return KErrNone, if successful; |
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KErrNotSupported, if the attribute is not defined in the list |
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of attributes, or is not meaningful for this device, or is |
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not settable. |
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@see HALData::TAttribute |
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@see HALData::TAttributeProperty |
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@capability WriteDeviceData or other capability specified |
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for individual attributes in TAttribute |
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*/ |
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IMPORT_C static TInt Set(TAttribute aAttribute, TInt aValue); |
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/** |
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Gets all HAL attributes, and their properties. |
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For attributes that are not meaningful on this device (ie. those which have |
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not been defined in the config.hcf file), |
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the attribute value and its associated property value are set to zero in |
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the returned array. |
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Attributes for which multiple values can be retrieved |
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ie. EDisplayIsPalettized, EDisplayBitsPerPixel, EDisplayOffsetToFirstPixel, |
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EDisplayOffsetBetweenLines, and EDisplayPaletteEntry will also be zero in |
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the returned array. |
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@param aNumEntries On successful return, contains the total number |
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of HAL attributes. |
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If the function returns KErrNoMemory, this value is set |
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to zero. |
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@param aData On successful return, contains a pointer to an array |
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of SEntry objects, each of which contains an attribute value |
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and its property value. Note that the property value is |
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defined by the HAL::TEntry synonym. |
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If the function returns KErrNoMemory, this pointer is set |
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to NULL. |
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@return KErrNone, if succesful; |
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KErrNoMemory, if there is insufficient memory. |
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*/ |
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IMPORT_C static TInt GetAll(TInt& aNumEntries, SEntry*& aData); |
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/** |
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Gets the value of the specified HAL attribute. |
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@param aDeviceNumber The device number. (eg: screen number) |
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@param aAttribute The HAL attribute. |
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@param aValue On successful return, contains the attribute value. |
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Some attributes may accept aValue as an input as well, to select |
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one of several alternate values. See the documentation for the |
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individual HAL attributes for details of this. |
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@return KErrNone, if successful; |
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KErrNotSupported, if the attribute is not defined in the list |
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of attributes, or is not meaningful for this device. |
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KErrArgument, if aValue was invalid (for attributes |
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which take an argument). |
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@see HALData::TAttribute |
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@see HALData::TAttributeProperty |
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*/ |
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IMPORT_C static TInt Get(TInt aDeviceNumber, TAttribute aAttribute, TInt& aValue); |
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/** |
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Sets the specified HAL attribute. |
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@param aDeviceNumber The device number. (eg: screen number) |
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@param aAttribute The HAL attribute. |
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@param aValue The attribute value. |
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@return KErrNone, if successful; |
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KErrNotSupported, if the attribute is not defined in the list |
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of attributes, or is not meaningful for this device, or is |
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not settable. |
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@see HALData::TAttribute |
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@see HALData::TAttributeProperty |
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@capability WriteDeviceData or other capability specified |
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for individual attributes in TAttribute |
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*/ |
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IMPORT_C static TInt Set(TInt aDeviceNumber, TAttribute aAttribute, TInt aValue); |
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}; |
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/** |
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@internalComponent |
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*/ |
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static const TInt32 KUidHalPropertyKeyBase = 0x1020E306; |
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__ASSERT_COMPILE(HAL::ENumHalAttributes<256); // only 256 UIDs allocated for HAL property keys |
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#endif |