// Copyright (c) 2004-2009 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:

// template\Template_Variant\Specific\xyin.cpp

// Implementation of a digitiser (touch-screen) driver. 

// This code assumes that an interrupt is generated on pen-down and pen-up events.

// This file is part of the Template Base port

// We use this driver to exemplify the usage of Resource Management for shared resources, Peripheral "Sleep"

// and detection and notification of Wakeup events

// 

//

#include <assp.h>

#include <template_assp.h>

#include <videodriver.h>

#include "mconf.h"

#include <drivers/xyin.h>

#include "template_power.h"

//

// TO DO: (mandatory)

//

// Define the following constants that describe the digitiser position & dimensions

// This is only example code... you need to modify it for your hardware

// digitiser origin & size in pixels

const TUint	KConfigXyOffsetX	= 0;		// digitiser origin - same as display area

const TUint	KConfigXyOffsetY	= 0;

const TUint	KConfigXyWidth		= 640;		// 640 pixels per line

const TUint	KConfigXyHeight		= 480;		// 480 lines per panel

// digitiser dimensions in digitiser co-ordinates

const TInt		KConfigXyBitsX			= 12;

const TInt		KConfigXyBitsY			= 12;

const TInt		KConfigXySpreadX		= 1 << KConfigXyBitsX;		// maximum valid X spread

const TInt		KConfigXySpreadY		= 1 << KConfigXyBitsY;		// maximum valid Y spread

const TInt		KConfigXyMinX			= 0;						// minimum valid X value

const TInt		KConfigXyMinY			= 0;						// minimum valid Y value

const TInt		KConfigXyMaxX			= KConfigXySpreadX - 1;		// maximum valid X value

const TInt		KConfigXyMaxY			= KConfigXySpreadY - 1;		// maximum valid Y value

// Define a 2x2 matrix and two constants Tx and Ty to convert digitiser co-ordinates 

// to pixels such that

//

// (X<<16 Y<<16)	=	(x y)	x	(R11 R12)	+	(Tx Ty)

//									(R21 R22)			

// or : 

//

// X = (x*R11 + y*R21 + TX) >> 16;

// Y = (x*R12 + y*R22 + TY) >> 16;

//

// where x,y are digitiser coordinates, Tx,Ty are constant offsets and X,Y are screen 

// coordinates. Left shifting by 16 bits is used so as not to lose precision.

//

// These are default values to be used before calibration has taken place

// These are best set by observation.

// The example values given below are for a digitiser whose origin is at bottom left

// (the screen origin is at top left)

const TInt		KConfigXyR11		= (KConfigXyWidth << 16) / KConfigXySpreadX;		// 10240

const TInt		KConfigXyR12		= 0;

const TInt		KConfigXyR21		= 0;

const TInt		KConfigXyR22		= - ((KConfigXyHeight << 16) / KConfigXySpreadY);	// -7680

const TInt		KConfigXyTx			= 0;

const TInt		KConfigXyTy			= (KConfigXyHeight << 16) / KConfigXySpreadY;

//

// TO DO: (optional)

//

// Define the following constants that describe the digitiser behaviour

// This is only example code... you need to modify it for your hardware

// After taking a sample, wait for the specified number of nano-kernel ticks (normally 1 ms) 

// before taking the next sample

const TInt		KInterSampleTime	= 1;	

// After a group of samples has been processed by the DDigitiser::ProcessRawSample() DFC,

// wait for the specified number of nano-kernel ticks before taking the next sample

const TInt		KInterGroupTime		= 1;

// After a pen-down interrupt, 

// wait for the specified number of nano-kernel ticks before taking the next sample

const TInt		KPenDownDelayTime	= 2;

// If powering up the device with the pen down, 

// wait for the specified number of nano-kernel ticks before taking the next sample

const TInt		KPenUpPollTime		= 30;

// After a pen-up interrupt, 

// wait for the specified number of nano-kernel ticks before calling PenUp()

const TInt		KPenUpDebounceTime	= 10;

// number of samples to discard on pen-down

const TInt		KConfigXyPenDownDiscard	= 1;		

// number of samples to discard on pen-up

const TInt		KConfigXyPenUpDiscard	= 1;		

// offset in pixels to cause movement in X direction

const TInt		KConfigXyAccThresholdX	= 12;		

// offset in pixels to cause movement in Y direction

const TInt		KConfigXyAccThresholdY	= 12;		

// number of samples to average - MUST be <= KMaxXYSamples

const TInt		KConfigXyNumXYSamples	= 2;		

// disregard extremal values in each 4-sample group

const TBool		KConfigXyDisregardMinMax= EFalse;	

// obsolete constants :

const TInt		KConfigXyDriveXRise		= 0;		

const TInt		KConfigXyDriveYRise		= 0;		

const TInt		KConfigXyMaxJumpX		= 0;		

const TInt		KConfigXyMaxJumpY		= 0;		

/******************************************************

 * Main Digitiser Class

 ******************************************************/

//

// TO DO: (optional)

//

// Add any private functions and data you require

//

NONSHARABLE_CLASS(DTemplateDigitiser) : public DDigitiser

	{

public:

	enum TState

		{

		E_HW_PowerUp,

		E_HW_PenUpDebounce,

		E_HW_CollectSample

		};

public:

	// from DDigitiser - initialisation

	DTemplateDigitiser();

	virtual TInt DoCreate();

	void SetDefaultConfig();

	// from DDigitiser - signals to hardware-dependent code

	virtual void WaitForPenDown();

	virtual void WaitForPenUp();

	virtual void WaitForPenUpDebounce();

	virtual void DigitiserOn();

	virtual void DigitiserOff();

	virtual void FilterPenMove(const TPoint& aPoint);

	virtual void ResetPenMoveFilter();

	// from DDigitiser - machine-configuration related things

	virtual TInt DigitiserToScreen(const TPoint& aDigitiserPoint, TPoint& aScreenPoint);

	virtual void ScreenToDigitiser(TInt& aX, TInt& aY);

	virtual TInt SetXYInputCalibration(const TDigitizerCalibration& aCalibration);

	virtual TInt CalibrationPoints(TDigitizerCalibration& aCalibration);

	virtual TInt SaveXYInputCalibration();

	virtual TInt RestoreXYInputCalibration(TDigitizerCalibrationType aType);

	virtual void DigitiserInfo(TDigitiserInfoV01& aInfo);

	// from DPowerHandler

	virtual void PowerDown(TPowerState);

	virtual void PowerUp();

public:

	// implementation

	void TakeSample();

	void PenInterrupt();

	void DigitiserPowerUp();

	void PowerUpDfc();

public:

	NTimer iTimer;

	NTimer iTimerInt;

	TDfc iTakeReadingDfc;

	TDfc iPowerDownDfc;

	TDfc iPowerUpDfc;

	TInt iSamplesCount;

	TState iState;

	TUint8 iPoweringDown;

	TSize iScreenSize;

	TActualMachineConfig& iMachineConfig;

	};

/******************************************************

 * Digitiser main code

 ******************************************************/

/**

Sample timer callback

Schedules a DFC to take a sample

@param aPtr	a pointer to DTemplateDigitiser

*/

LOCAL_C void timerExpired(TAny* aPtr)

	{

	DTemplateDigitiser* pD=(DTemplateDigitiser*)aPtr;

	__KTRACE_OPT(KHARDWARE,Kern::Printf("T"));

	pD->iTakeReadingDfc.Add();

	}

/**

Debounce timer callback 

schedules a DFC to process a pen-down interrupt

@param aPtr	a pointer to DTemplateDigitiser

*/

LOCAL_C void timerIntExpired(TAny* aPtr)

	{

	DTemplateDigitiser* pD=(DTemplateDigitiser*)aPtr;

	__KTRACE_OPT(KHARDWARE,Kern::Printf("TI"));

	// clear xy interrupt -> re-triggers the interrupt mechanism to catch the next IRQ

	// TO DO: (mandatory)

	// Write to the appropriate hardware register to clear the digitiser interrupt

	//

	pD->iTakeReadingDfc.Add();

	}

/**

Pen-up/down interrupt handler

@param aPtr	a pointer to DTemplateDigitiser

*/

LOCAL_C void penInterrupt(TAny* aPtr)

	{

	DTemplateDigitiser* pD=(DTemplateDigitiser*)aPtr;

	pD->PenInterrupt();

	}

/**

DFC for taking a sample

@param aPtr	a pointer to DTemplateDigitiser

*/

LOCAL_C void takeReading(TAny* aPtr)

	{

	DTemplateDigitiser* pD=(DTemplateDigitiser*)aPtr;

	pD->TakeSample();

	}

/**

DFC for powering down the device

@param aPtr	a pointer to DTemplateDigitiser

*/

LOCAL_C void powerDownDfc(TAny* aPtr)

	{

	DTemplateDigitiser* pD=(DTemplateDigitiser*)aPtr;

	pD->DigitiserOff();

	}

/**

DFC for powering up the device

@param aPtr	a pointer to DTemplateDigitiser

*/

LOCAL_C void powerUpDfc(TAny* aPtr)

	{

	DTemplateDigitiser* pD=(DTemplateDigitiser*)aPtr;

	pD->PowerUpDfc();

	}

/**

Creates a new instance of DDigitiser. 

Called by extension entry point (PIL) to create a DDigitiser-derived object.

@return	a pointer to a DTemplateDigitiser object

*/

DDigitiser* DDigitiser::New()

	{

	return new DTemplateDigitiser;

	}

/**

Default constructor

*/

DTemplateDigitiser::DTemplateDigitiser() :

		iTimer(timerExpired,this),

		iTimerInt(timerIntExpired,this),

		iTakeReadingDfc(takeReading,this,5),

		iPowerDownDfc(powerDownDfc,this,5),

		iPowerUpDfc(powerUpDfc,this,5),

		iMachineConfig(TheActualMachineConfig())

	{

	iDfcQ = Kern::DfcQue0();

	iTakeReadingDfc.SetDfcQ(iDfcQ);

	iPowerDownDfc.SetDfcQ(iDfcQ);

	iPowerUpDfc.SetDfcQ(iDfcQ);

	}

/**

Perform hardware-dependent initialisation

Called by platform independent layer

*/

TInt DTemplateDigitiser::DoCreate()

	{

	__KTRACE_OPT(KEXTENSION,Kern::Printf("DTemplateDigitiser::DoCreate"));

	if (Kern::ColdStart())

		{

		__KTRACE_OPT(KEXTENSION,Kern::Printf("Resetting digitiser calibration"));

		// Emergency digitiser calibration values

		iMachineConfig.iCalibration.iR11 = KConfigXyR11;

		iMachineConfig.iCalibration.iR12 = KConfigXyR12;

		iMachineConfig.iCalibration.iR21 = KConfigXyR21;

		iMachineConfig.iCalibration.iR22 = KConfigXyR22;

		iMachineConfig.iCalibration.iTx = KConfigXyTx;

		iMachineConfig.iCalibration.iTy = KConfigXyTy;

		}

	// register power handler

	Add();

	DigitiserPowerUp();

	// bind to the pen-up/down interrupt

	TInt r=Interrupt::Bind(KIntIdDigitiser, penInterrupt, this);

	if (r!=KErrNone)

		return r;

	// set up the default configuration

	SetDefaultConfig();

	return r;

	}

/**

Initialise the DDigitiser::iCfg structure

*/

void DTemplateDigitiser::SetDefaultConfig()

	{

	iCfg.iPenDownDiscard = KConfigXyPenDownDiscard;		// number of samples to discard on pen-down

	iCfg.iPenUpDiscard = KConfigXyPenUpDiscard;			// number of samples to discard on pen-up

	iCfg.iDriveXRise = KConfigXyDriveXRise;				// number of milliseconds to wait when driving horizontal edges

	iCfg.iDriveYRise = KConfigXyDriveYRise;				// number of milliseconds to wait when driving vertical edges

	iCfg.iMinX = KConfigXyMinX;							// minimum valid X value

	iCfg.iMaxX = KConfigXyMaxX;							// maximum valid X value

	iCfg.iSpreadX = KConfigXySpreadX;					// maximum valid X spread

	iCfg.iMinY = KConfigXyMinY;							// minimum valid Y value

	iCfg.iMaxY = KConfigXyMaxY;							// maximum valid Y value

	iCfg.iSpreadY = KConfigXySpreadY;					// maximum valid Y spread

	iCfg.iMaxJumpX = KConfigXyMaxJumpX;					// maximum X movement per sample (pixels)

	iCfg.iMaxJumpY = KConfigXyMaxJumpY;					// maximum Y movement per sample (pixels)

	iCfg.iAccThresholdX = KConfigXyAccThresholdX;		// offset in pixels to cause movement in X direction

	iCfg.iAccThresholdY = KConfigXyAccThresholdY;		// offset in pixels to cause movement in Y direction

	iCfg.iNumXYSamples = KConfigXyNumXYSamples;			// number of samples to average

	iCfg.iDisregardMinMax = KConfigXyDisregardMinMax;	// disregard extremal values in each 4-sample group

	}

/**

Takes a sample from the digitiser.

Called in the context of a DFC thread.

*/

void DTemplateDigitiser::TakeSample()

	{

	TTemplatePowerController::WakeupEvent();	// notify of pendown (wakeup event) and let the power controller sort

												// out if it needs propagation

	TBool penDown = EFalse;

	// TO DO: (mandatory)

	// Read from appropriate hardware register to determine whether digitiser panel is being touched

	// Set penDown to ETrue if touched or EFalse if not touched.

	//

	__KTRACE_OPT(KHARDWARE,Kern::Printf("TS: S%d PD%d Sp%d", (TInt)iState, penDown?1:0, iSamplesCount));

	if (iState==E_HW_PowerUp)

		{

		// waiting for pen to go up after switch on due to pen down or through the HAL

		// coverity[dead_error_condition]

		// The next line should be reachable when this template file is edited for use

		if (!penDown)							// pen has gone up -> transition to new state

			{

			iState=E_HW_CollectSample;

			iSamplesCount=0;						// reset sample buffer

			// TO DO: (mandatory)

			// Write to the appropriate hardware register to clear the digitiser interrupt

			//

			// TO DO: (mandatory)

			// Write to the appropriate hardware register(s) to allow the hardware 

			// to detect when the digitizer panel is touched

			//

			Interrupt::Enable(KIntIdDigitiser);		// enable pen-down interrupt

 			// TO DO: (mandatory)

			// Write to the appropriate hardware register to enable the digitiser interrupt

			//

			}

		else									// pen is still down, wait a bit longer in this state

			{

			iTimer.OneShot(KPenUpPollTime);

			}

		return;

		}

	if (!penDown)

		{

		if (iState==E_HW_PenUpDebounce)

			{

			iState=E_HW_CollectSample;	// back to initial state, no samples collected

			iSamplesCount=0;			// reset sample buffer

			// Need to lock the kernel to simulate ISR context and thus defer preemption, 

			// since PenUp() expects an ISR context and calls TDfc::Add().

			NKern::Lock();

			PenUp();					// adds DFC

			NKern::Unlock();

			}

		else							// iState=E_HW_CollectSample

			{

			iState=E_HW_PenUpDebounce;

			iTimer.OneShot(KPenUpDebounceTime);		// wait a bit to make sure pen still up

			}

		return;

		}

	else if (iState==E_HW_PenUpDebounce)	// pen down

		{

		// false alarm - pen is down again

		iState=E_HW_CollectSample;		// take a new set of samples

		iSamplesCount=0;				// reset sample buffer

		}

	// default: pen down and iState=E_HW_CollectSample

	// TO DO: (mandatory)

	// Read from appropriate hardware register to get the current digitiser coordinates 

	// of the point that is being touched. Set aResults accordingly.

	// This is only example code... you need to modify it for your hardware

	//

	TPoint aResults;

	// X axis

	iX[iSamplesCount] = aResults.iX;

	// Y axis

	iY[iSamplesCount] = aResults.iY;

	__KTRACE_OPT(KHARDWARE,Kern::Printf("Raw: X=%d Y=%d",iX[iSamplesCount],iY[iSamplesCount]));

	// Put the hardware back into pen-detect mode

	// TO DO: (mandatory)

	// Write to the appropriate hardware register(s) to allow the hardware 

	// to detect when the digitizer panel is touched

	//

	// count samples collected - if it's less than minimum,

	// schedule the reading of another sample

	if (++iSamplesCount < iCfg.iNumXYSamples)	// iX[] and iY[] are 4 levels deep in xyin.h...

		{

		if(KInterSampleTime > 0)				// need to check this config param as it might be zero!

			iTimer.OneShot(KInterSampleTime);	// haven't got a complete group yet, so queue timer to sample again

		else

			iTakeReadingDfc.Enque();

		return;

		}

	// Have a complete group of samples so pass up to processing layer (PIL)

	// Need to lock the kernel to simulate ISR context and thus defer preemption, 

	// since RawSampleValid() expects an ISR context and calls TDfc::Add().

	NKern::Lock();			

	RawSampleValid();		// adds DFC

	NKern::Unlock();

	}

/**

Request for an interrupt to be generated when the pen is next down

Called by PIL at startup or when pen leaves digitiser after pen-up event issued

*/

void DTemplateDigitiser::WaitForPenDown()

	{

	// Called at startup or when pen leaves digitiser after pen-up event issued

	__KTRACE_OPT(KHARDWARE,Kern::Printf("WD: PowerDownMask %x",iPoweringDown));

	if (iPoweringDown)

		{

		// powering down

		// TO DO: (mandatory)

		// Write to the appropriate hardware register(s) to allow the hardware 

		// to detect when the digitizer panel is touched and wakes up the system if in standby

		//

		//

		// TO DO: (optional)

		//

		// Relinquish request on power resources

		// This will place the peripheral hardware in a low power "Sleep" mode which is Interrupt detection capable

		// EXAMPLE ONLY

		//

		TemplateResourceManager* aManager = TTemplatePowerController::ResourceManager();

		aManager -> ModifyToLevel(TemplateResourceManager::AsynchMlResourceUsedByXOnly, 50 /* a percentage */);

		aManager -> SharedBResource1() -> Release();

		iPoweringDown = EFalse;

		PowerDownDone();

		}

	else

		{

		// TO DO: (mandatory)

		// Write to the appropriate hardware register to clear the digitiser interrupt

		//

		// TO DO: (mandatory)

		// Write to the appropriate hardware register(s) to allow the hardware 

		// to detect when the digitizer panel is touched

		//

		if ((iTimer.iState == NTimer::EIdle) && (iTimerInt.iState == NTimer::EIdle))

			Interrupt::Enable(KIntIdDigitiser);		// enable pen-down interrupt

		}

	}

/**

Called by PIL after it has processed a group of raw samples while pen is down.

Used to indicate that the iX, iY buffers may be re-used

*/

void DTemplateDigitiser::WaitForPenUp()

	{

	__KTRACE_OPT(KHARDWARE,Kern::Printf("WU"));

	iState = E_HW_CollectSample;

	iSamplesCount = 0;					// reset sample buffer

	if(KInterGroupTime > 0)				// need to check this config param as it might be zero!

		iTimer.OneShot(KInterGroupTime);

	else

		iTakeReadingDfc.Enque();

	}

/**

Called by PIL if the group of samples collected is not good enough

Used to indicate that the iX, iY buffers may be re-used

*/

void DTemplateDigitiser::WaitForPenUpDebounce()

	{

	__KTRACE_OPT(KHARDWARE,Kern::Printf("WUDB"));

	iState = E_HW_CollectSample;

	iSamplesCount = 0;			// reset sample buffer

	if(KInterGroupTime > 0)					// need to check this config param as it might be zero!

		iTimer.OneShot(KInterGroupTime);

	else

		iTakeReadingDfc.Enque();

	}

/**

Pen up/down interrupt service routine (ISR)

*/

void DTemplateDigitiser::PenInterrupt()

    {

	__KTRACE_OPT(KHARDWARE,Kern::Printf("I"));

	Interrupt::Clear(KIntIdDigitiser);	// should already have been cleared

	// TO DO: (mandatory)

	// Read from appropriate hardware register to determine whether digitiser panel is being touched

	// Set penDown to ETrue if touched or EFalse if not touched.

	// This is only example code... you need to modify it for your hardware

	TBool penDown = EFalse;

	// coverity[dead_error_condition]

	if(!penDown)					// pen up

		{

		// TO DO: (mandatory)

		// Write to the appropriate hardware register to clear the digitiser interrupt

		//

		// TO DO: (mandatory)

		// Write to the appropriate hardware register(s) to allow the hardware 

		// to detect when the digitizer panel is touched

		//

		return;						// ... and exit!

		}

	Interrupt::Disable(KIntIdDigitiser);		// do NOT disable the capability to generate interrupts at the source

	if (KPenDownDelayTime>0)					// need to check this config param as it might be zero!

		iTimerInt.OneShot(KPenDownDelayTime);	// start a debounce timer which will queue a DFC to process the interrupt

	else

		{

		// TO DO: (mandatory)

		// Write to the appropriate hardware register to clear the digitiser interrupt

		// This will re-trigger the interrupt mechanism to catch the next interrupt...

		//

		iTakeReadingDfc.Add();

		}

	}

/**

DPowerHandler pure virtual

*/

void DTemplateDigitiser::PowerUp()

	{

	iPowerUpDfc.Enque();			// queue a DFC in this driver's context

	}

/**

Called by power up DFC

*/

void DTemplateDigitiser::PowerUpDfc()

	{

	__KTRACE_OPT(KPOWER, Kern::Printf("DTemplateDigitiser::PowerUpDfc()"));

	DigitiserOn();

	PowerUpDone();			// must be called from a different thread than PowerUp()

	}

/**

Turn the digitiser on

May be called as a result of a power transition or from the HAL

If called from HAL, then the digitiser may be already be on (iPointerOn == ETrue)

*/

void DTemplateDigitiser::DigitiserOn()

	{

	__KTRACE_OPT(KPOWER,Kern::Printf("DTemplateDigitiser::DigitiserOn() iPointerOn=%d", iPointerOn));

	if (!iPointerOn)				// may have been powered up already

		DigitiserPowerUp();

	}

/**

Power-up the digitiser. Assumes digitiser is off.

*/

void DTemplateDigitiser::DigitiserPowerUp()

	{

	__KTRACE_OPT(KPOWER, Kern::Printf("DigitiserPowerUp"));

	iPointerOn = ETrue;		// now turned on

	// TO DO: (mandatory)

	// Write to the appropriate hardware register to clear the digitiser interrupt

	//

	//

	// TO DO: (optional)

	//

	// Reassert request on power resources

	// This will move the peripheral hardware out of low power "Sleep" mode back to fully operational

	// EXAMPLE ONLY

	//

	TemplateResourceManager* aManager = TTemplatePowerController::ResourceManager();

	aManager -> ModifyToLevel(TemplateResourceManager::AsynchMlResourceUsedByXOnly, 100 /* a percentage */);

	aManager -> SharedBResource1() -> Use();

	// TO DO: (mandatory)

	// Write to the appropriate hardware register(s) to allow the hardware 

	// to detect when the digitizer panel is touched

	//

	iState = E_HW_PowerUp;	// so we wait for pen up if necessary

	iTakeReadingDfc.Enque();

	}

/**

DPowerHandler pure virtual

@param aPowerState the current power state

*/

void DTemplateDigitiser::PowerDown(TPowerState /*aPowerState*/)

	{

	iPoweringDown = ETrue;

	iPowerDownDfc.Enque();						// queue a DFC in this driver's context

	}

/**

Turn the digitiser off

May be called as a result of a power transition or from the HAL

If called from Power Manager, then the digitiser may be already be off (iPointerOn == EFalse)

if the platform is in silent running mode

*/

void DTemplateDigitiser::DigitiserOff()

	{

	__KTRACE_OPT(KPOWER,Kern::Printf("DTemplateDigitiser::DigitiserOff() iPointerOn=%d", iPointerOn));

	if (iPointerOn)		// can have been powered down from HAL

		{

		iPointerOn = EFalse;

		Interrupt::Disable(KIntIdDigitiser);

		// TO DO: (mandatory)

		// Write to the appropriate hardware register to disable the digitiser interrupt

		//

		iTimer.Cancel();

		iTimerInt.Cancel();

		iTakeReadingDfc.Cancel();

		if (iState != E_HW_CollectSample)

			{

			// Need to lock the kernel to simulate ISR context and thus defer preemption, 

			// since PenUp() expects an ISR context and calls TDfc::Add().

			NKern::Lock();

			PenUp();		// adds DFC (will call WaitForPenDown)

			NKern::Unlock();

			}

		else

			{

			// TO DO: (mandatory)

			// Write to the appropriate hardware register(s) to allow the hardware 

			// to detect when the digitizer panel is touched and wakes up the system if in standby

			//

			//

			// TO DO: (optional)

			//

			// Relinquish request on power resources as we are being powered down

			// This will place the peripheral hardware in a low power "Sleep" mode which is Interrupt detection capable

			// EXAMPLE ONLY

			//

			TemplateResourceManager* aManager = TTemplatePowerController::ResourceManager();

			aManager -> ModifyToLevel(TemplateResourceManager::AsynchMlResourceUsedByXOnly, 0 /* a percentage */);

			aManager -> SharedBResource1() -> Release();

			if (iPoweringDown)			// came here through PowerDown

				{

				iPoweringDown = EFalse;

				PowerDownDone();

				}

			}

		}

	else	// already powered down (by HAL)

		{

			if (iPoweringDown)			// came here through PowerDown

				{

				iPoweringDown = EFalse;

				PowerDownDone();

				}

		}

	}

/**

Convert digitiser coordinates to screen coordinates

@param aDigitiserPoint the digitiser coordinates

@param aScreenPoint A TPoint supplied by the caller. 

					On return, set to the converted screen coordinates in pixels.

@return KErrNone if successful

*/

TInt DTemplateDigitiser::DigitiserToScreen(const TPoint& aDigitiserPoint, TPoint& aScreenPoint)

	{

	NKern::LockSystem();

	TInt R11 = iMachineConfig.iCalibration.iR11;

	TInt R12 = iMachineConfig.iCalibration.iR12;

	TInt R21 = iMachineConfig.iCalibration.iR21;

	TInt R22 = iMachineConfig.iCalibration.iR22;

	TInt TX = iMachineConfig.iCalibration.iTx;

	TInt TY = iMachineConfig.iCalibration.iTy;

	NKern::UnlockSystem();

	TInt X = aDigitiserPoint.iX;

	TInt Y = aDigitiserPoint.iY;

	aScreenPoint.iX = (X*R11 + Y*R21 + TX) >> 16;

	aScreenPoint.iY = (X*R12 + Y*R22 + TY) >> 16;

	__KTRACE_OPT(KHARDWARE,Kern::Printf("DtS: Dp.x %d, Dp.y %d, Sp.x %d, Sp.y %d", X,Y,aScreenPoint.iX,aScreenPoint.iY));

	return KErrNone;

	}

/**

Convert screen coordinates back into digitiser coordinates

using the current constants from the superpage

@param aX The screen X coordinate in pixels; On return, set to the digitiser X coordinate.

@param aY The screen Y coordinate in pixels; On return, set to the digitiser Y coordinate.

*/

void DTemplateDigitiser::ScreenToDigitiser(TInt& aX, TInt& aY)

	{

	NKern::LockSystem();

	Int64 R11 = iMachineConfig.iCalibration.iR11;

	Int64 R12 = iMachineConfig.iCalibration.iR12;

	Int64 R21 = iMachineConfig.iCalibration.iR21;

	Int64 R22 = iMachineConfig.iCalibration.iR22;

	Int64 TX = iMachineConfig.iCalibration.iTx;

	Int64 TY = iMachineConfig.iCalibration.iTy;

	NKern::UnlockSystem();

	Int64 X = aX;

	Int64 Y = aY;

	//

	// Xd=(Xs<<16)*R22-(Ys<<16)*R21-(TX*R22)+(TY*R21)

	//	  -------------------------------------------

	//				   (R22*R11)-(R21*R12)

	//

	//

	// Yd=(Xs<<16)*R12-(Ys<<16)*R11-(TX*R12)+(TY*R11)

	//	  -------------------------------------------

	//				   (R21*R12)-(R22*R11)

	//

	// where Xd and Yd are digitiser coordinates

	//		 Xs and Ys are supplied screen coordinates

	//

	X<<=16;

	Y<<=16;

	Int64 d=Int64(R21)*Int64(R12)-Int64(R22)*Int64(R11);

	Int64 r=(X*R12)-(Y*R11)-(TX*R12)+(TY*R11);

	r=r/d;

	aY=(TInt)r;

	r=(X*R22)-(Y*R21)-(TX*R22)+(TY*R21);

	r=r/(-d);

	aX=(TInt)r;

	}

/**

Calculate values for R11, R12, R21, R22, TX and TY

@param aCalibration the screen coordinates of points touched

@return KErrNone if successful

*/

TInt DTemplateDigitiser::SetXYInputCalibration(const TDigitizerCalibration& aCalibration)

	{

	TInt R11,R12,R21,R22,TX,TY;

	//

	// Get coords of expected points

	//

	TDigitizerCalibration cal;

	TInt ret=CalibrationPoints(cal);

	if (ret!=KErrNone)

		return ret;

	TInt Xp1=cal.iTl.iX;

	TInt Yp1=cal.iTl.iY;

	TInt Xp2=cal.iBl.iX;

	TInt Yp2=cal.iBl.iY;

	TInt Xp3=cal.iBr.iX;

	TInt Yp3=cal.iBr.iY;

	//

	// Get coords of points touched in screen coordinates

	//

	TInt X1=aCalibration.iTl.iX;

	TInt Y1=aCalibration.iTl.iY;

	TInt X2=aCalibration.iBl.iX;

	TInt Y2=aCalibration.iBl.iY;

	TInt X3=aCalibration.iBr.iX;

	TInt Y3=aCalibration.iBr.iY;

	//

	// Convert back to raw digitiser coordinates

	//

	ScreenToDigitiser(X1,Y1);

	ScreenToDigitiser(X2,Y2);

	ScreenToDigitiser(X3,Y3);

	//

	// (Y1-Y2)(Xp1-Xp3) - (Y1-Y3)(Xp1-Xp2)

	// ----------------------------------- = R11

	// (Y1-Y2)(X1-X3)	- (Y1-Y3)(X1-X2)

	//

	Int64 r=((Int64(Y1-Y2)*Int64(Xp1-Xp3))-(Int64(Y1-Y3)*Int64(Xp1-Xp2)));

	r<<=16;

	r/=(Int64(Y1-Y2)*Int64(X1-X3)-Int64(Y1-Y3)*Int64(X1-X2));

	R11=(TInt)r;

	//

	// (Y1-Y2)(Yp1-Yp3) - (Y1-Y3)(Yp1-Yp2)

	// ----------------------------------- = R12

	// (Y1-Y2)(X1-X3)	- (Y1-Y3)(X1-X2)

	//

	r=((Int64(Y1-Y2)*Int64(Yp1-Yp3))-(Int64(Y1-Y3)*Int64(Yp1-Yp2)));

	r<<=16;

	r/=(Int64(Y1-Y2)*Int64(X1-X3)-Int64(Y1-Y3)*Int64(X1-X2));

	R12=(TInt)r;

	//

	// (X1-X3)(Xp2-Xp3) - (X2-X3)(Xp1-Xp3)

	// ----------------------------------- = R21

	// (Y2-Y3)(X1-X3)	- (Y1-Y3)(X2-X3)

	//

	r=(((X1-X3)*(Xp2-Xp3))-((X2-X3)*(Xp1-Xp3)));

	r<<=16;

	r/=(Int64(Y2-Y3)*Int64(X1-X3)-Int64(Y1-Y3)*Int64(X2-X3));

	R21=(TInt)r;

	//	

	// (X1-X3)(Yp2-Yp3) - (X2-X3)(Yp1-Yp3)

	// ----------------------------------- = R22

	// (Y2-Y3)(X1-X3)	- (Y1-Y3)(X2-X3)

	//

	r=((Int64(X1-X3)*Int64(Yp2-Yp3))-(Int64(X2-X3)*Int64(Yp1-Yp3)));

	r<<=16;

	r/=(Int64(Y2-Y3)*Int64(X1-X3)-Int64(Y1-Y3)*Int64(X2-X3));

	R22=(TInt)r;

	//

	// TX = Xp1 - X1*R11 - Y1*R21

	//

   TX=(Xp1<<16)-(X1*R11)-(Y1*R21);

	//

	// TY = Yp1 - X1*R12 - Y1*R22

	//

	TY=(Yp1<<16)-(X1*R12)-(Y1*R22);

	//

	// Write new values into the superpage

	// 

	NKern::LockSystem();

	iMachineConfig.iCalibration.iR11 = R11;

	iMachineConfig.iCalibration.iR12 = R12;

	iMachineConfig.iCalibration.iR21 = R21;

	iMachineConfig.iCalibration.iR22 = R22;

	iMachineConfig.iCalibration.iTx = TX;

	iMachineConfig.iCalibration.iTy = TY;

	NKern::UnlockSystem();

	return(KErrNone);

	}

/**

Informs the user-side calibration application where to draw 

the cross-hairs on the screen

@param aCalibration On return contains the for points on the screen (in screen coordinates)

					where the cross-hairs should be drawn

@return KErrNone if succcessful

*/

TInt DTemplateDigitiser::CalibrationPoints(TDigitizerCalibration& aCalibration)

	{

	TVideoInfoV01Buf buf;

	TVideoInfoV01& vidinfo=buf();

	TInt r = Kern::HalFunction(EHalGroupDisplay, EDisplayHalCurrentModeInfo, (TAny*)&buf, NULL);

	if (r!=KErrNone)

		return r;

	iScreenSize=vidinfo.iSizeInPixels;

    aCalibration.iBl.iX = aCalibration.iTl.iX = iScreenSize.iWidth/10;

    aCalibration.iTr.iY = aCalibration.iTl.iY = iScreenSize.iHeight/10;

    aCalibration.iBr.iY = aCalibration.iBl.iY = iScreenSize.iHeight-iScreenSize.iHeight/10;

    aCalibration.iTr.iX = aCalibration.iBr.iX = iScreenSize.iWidth-iScreenSize.iWidth/10;

    return r;

	}

/**

Saves the digitiser calibration to the persistent machine configuration area

so that it can be restored after a power-down/up

@return KErrNone if succcessful

*/

TInt DTemplateDigitiser::SaveXYInputCalibration()

	{

	NKern::LockSystem();

	iMachineConfig.iCalibrationSaved = iMachineConfig.iCalibration;

	NKern::UnlockSystem();

	return(KErrNone);

	}

/**

Restores the digitiser calibration from the persistent machine configuration area

following a power-up

@param aType indicates whether to restore factory or saved settings

@return KErrNone if succcessful

*/

TInt DTemplateDigitiser::RestoreXYInputCalibration(TDigitizerCalibrationType aType)

	{

	TInt r=KErrNone;

	NKern::LockSystem();

	switch (aType)

		{

		case EFactory:

			iMachineConfig.iCalibration=iMachineConfig.iCalibrationFactory;

			break;

		case ESaved:

			iMachineConfig.iCalibration=iMachineConfig.iCalibrationSaved;

			break;

		default:

			r=KErrNotSupported;

			break;