/*
 * Copyright (c) 2002-2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * Copyright (c) 2004 Apple Computer, Inc.  All rights reserved.
 *
 *  File: $Id: SMU_Neo2_CPUCurrentSensor.cpp,v 1.7 2004/07/22 22:51:56 dirty Exp $
 */


#include "IOPlatformPluginSymbols.h"
#include "SMU_Neo2_PlatformPlugin.h"

#include "SMU_Neo2_CPUCurrentSensor.h"


OSDefineMetaClassAndStructors( SMU_Neo2_CPUCurrentSensor, IOPlatformSensor )


IOReturn SMU_Neo2_CPUCurrentSensor::initPlatformSensor( const OSDictionary* dict )
	{
	UInt16						scalingValue;
	SInt16						offsetValue;
	IOReturn					status;

	status = IOPlatformSensor::initPlatformSensor( dict );

	// scalingValue is a 4.12 unsigned number.
	// offsetValue is a 4.12 signed number.

	if ( !gPlatformPlugin->getSDBPartitionData( kThermalPositioningADCConstantsPartID, 8, 2, ( UInt8 * ) &scalingValue ) )
		return( kIOReturnError );

	if ( !gPlatformPlugin->getSDBPartitionData( kThermalPositioningADCConstantsPartID, 10, 2, ( UInt8 * ) &offsetValue ) )
		return( kIOReturnError );

	scalingFactor = scalingValue;
	offsetFactor = offsetValue;

	return( status );
	}


SensorValue SMU_Neo2_CPUCurrentSensor::applyCurrentValueTransform( SensorValue hwReading ) const
	{
	SensorValue						scaledReading;

	scaledReading.sensValue = ( SInt32 )( scalingFactor * ( UInt32 ) hwReading.sensValue ) + offsetFactor;

	// Now convert to 16.16

	scaledReading.sensValue <<= 4;

	return( scaledReading );
	}