/*

* Copyright (c) 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:

*

*/

#include "svpsnapdriver.h"

#include "rsvpsnapdriver.h"

#include "system.h"

static inline TUint32 ReadReg(ESVPSnapReg aReg)

{

  DP("** (SVPSNAPDRIVER) ReadReg(%d)",aReg);

	return *(volatile TUint32 *)(KHwSVPSnapDevice + (aReg << 2));

}

static inline void WriteReg(ESVPSnapReg aReg, TUint32 aVal)

{

  DP("** (SVPSNAPDRIVER) WriteReg(%d,%d)",aReg,aVal);

  *(volatile TUint32*)(KHwSVPSnapDevice + (aReg << 2)) = aVal;

}

//

// DSVPSnapDriverFactory

//

DSVPSnapDriverFactory::DSVPSnapDriverFactory()

{

  DP("** (SVPSNAPDRIVER) DSVPSnapDriverFactory::DSVPSnapDriverFactory()");

  iVersion = TVersion(KMajorVersionNumber,KMinorVersionNumber,KBuildVersionNumber);    

}

TInt DSVPSnapDriverFactory::Create(DLogicalChannelBase*& aChannel)

{

  DP("** (SVPSNAPDRIVER) DSVPSnapDriverFactory::Create()");

#if 0

  if (iOpenChannels != 0)

	return KErrInUse; // a channel is already open

#endif

	aChannel = new DSVPSnapChannel(this);

	return aChannel ? KErrNone : KErrNoMemory;

}

TInt DSVPSnapDriverFactory::Install()

{

  DP("** (SVPSNAPDRIVER) DSVPSnapDriverFactory::Install()");

  return(SetName(&KSVPSnapDriverName));

}

void DSVPSnapDriverFactory::GetCaps(TDes8& aDes) const

{

  DP("** (SVPSNAPDRIVER) DSVPSnapDriverFactory::GetCaps()");

  TCapsSVPSnapDriver b;

  b.iVersion = TVersion(KMajorVersionNumber, KMinorVersionNumber, KBuildVersionNumber);

  aDes.FillZ(aDes.MaxLength());

  aDes.Copy((TUint8 *)&b, Min(aDes.MaxLength(), sizeof(b)));

}

//

// DSVPSnapChannel

//

DSVPSnapChannel::DSVPSnapChannel(DLogicalDevice* aLogicalDevice)

{

  DP("** (SVPSNAPDRIVER) DSVPSnapChannel::DSVPSnapChannel()");

  iDevice = aLogicalDevice;

  iClientThread = &Kern::CurrentThread();

  iClientThread->Open();

}

DSVPSnapChannel::~DSVPSnapChannel()

{

  DP("** (SVPSNAPDRIVER) DSVPSnapChannel::~DSVPSnapChannel() ->");

  Kern::SafeClose((DObject*&)iClientThread, NULL);

  DP("** (SVPSNAPDRIVER) DSVPSnapChannel::~DSVPSnapChannel() <-");

}

TInt DSVPSnapChannel::DoCreate(TInt /*aUnit*/, const TDesC* anInfo, const TVersion& aVer)

{

  DP("** (SVPSNAPDRIVER) DSVPSnapChannel::DoCreate()");

  if (!Kern::QueryVersionSupported(TVersion(KMajorVersionNumber, KMinorVersionNumber, KBuildVersionNumber), aVer))

	return KErrNotSupported; 

  //Setup the driver for receiving client messages

  SetDfcQ(Kern::DfcQue0());

  iMsgQ.Receive();  	

  DP("** (SVPSNAPDRIVER) DSVPSnapChannel::DoCreate()- checking device");

  TUint id = ReadReg(ESnapshot_Id);

  DP("** (SVPSNAPDRIVER) DSVPSnapChannel::DoCreate()- checked device- 0x%08x", id);

  WriteReg(ESnapshot_Address, 0);

  return KErrNone;

}

void DSVPSnapChannel::DoCancel(TInt aReqNo)

{

  DP("** (SVPSNAPDRIVER) DSVPSnapChannel::DoCancel() %x(%d)", aReqNo, aReqNo);

}

TInt DSVPSnapChannel::DoRequest(TInt aReqNo, TRequestStatus* aStatus, TAny* a1, TAny* a2)

{

  DP("** (SVPSNAPDRIVER) DSVPSnapChannel::DoRequest() %x(%d)", aReqNo, aReqNo);

  TInt err = KErrGeneral;         

  switch(aReqNo)

	{

	case RSVPSnapDriver::ESaveVM:

	  	  DP("RSVPSnapDriver::ESaveVM");

	  	  err = SaveVM((const TDesC8*)a1);

	  break;

	case RSVPSnapDriver::ELoadVM:

	  	 DP("RSVPSnapDriver::ELoadVM");

	  	 err= LoadVM((const TDesC8*)a1);

	  break;

	default:

	  	  DP("default");

	  err = KErrGeneral;

	  break;

	}

  if (KErrNone != err)

	DP("** (SVPSNAPDRIVER) Error %d from DoRequest", err);

  return err;

}

TInt DSVPSnapChannel::DoControl(TInt aFunction, TAny* a1, TAny* a2)

{

  DP("** (SVPSNAPDRIVER) DSVPSnapChannel::DoControl(%d)", aFunction);

  TInt err = KErrGeneral;         

  /* There should be a good reason to use a control rather than a request. */

  if (KErrNone != err) {

	DP("** (SVPSNAPDRIVER) Error %d from control function", err);

  }

  return err;

}

void DSVPSnapChannel::HandleMsg(TMessageBase* aMsg)

{

  TThreadMessage& m = *(TThreadMessage*)aMsg;

  TInt id = m.iValue;

  DP("** (SVPSNAPDRIVER) DSVPSnapChannel::HandleMsg() %x(%d)", id, id);

  if (id == (TInt)ECloseMsg)

	{

	  m.Complete(KErrNone, EFalse); 

	  return;

	}

  if (id == KMaxTInt)

	{

	  // DoCancel

	  DoCancel(m.Int0());

	  m.Complete(KErrNone, ETrue); 

	  return;

	}

  if (id < 0)

	{

	  // DoRequest

	  TRequestStatus* pStatus = (TRequestStatus*)m.Ptr0();

	  TInt r = DoRequest(~id, pStatus, m.Ptr1(), m.Ptr2());

	  //	  if (r != KErrNone)

	  Kern::RequestComplete(iClientThread,pStatus,r);

	  m.Complete(KErrNone, ETrue);

	}

  else

	{

	  // DoControl

	  TInt r = DoControl(id, m.Ptr0(), m.Ptr1());

	  m.Complete(r, ETrue);

	}

}

TInt DSVPSnapChannel::SaveVM(const TDesC8* aData)

{

  DP("** DSVPSnapChannel::SaveVM()");

  TInt err = KErrNone; 

  RET_IF_ERROR(err, Kern::ThreadDesRead(iClientThread, aData, iSendDataBuffer,0));

  TUint32 * ptr = (TUint32*) iSendDataBuffer.Ptr();

  WriteReg(ESnapshot_Address, Epoc::LinearToPhysical((TUint32)ptr));

  WriteReg(ESnapshot_Length, (TUint32) (iSendDataBuffer.Length()));

  WriteReg(ESnapshot_Trigger, RSVPSnapDriver::ESaveVM);

  return err;

}

TInt DSVPSnapChannel::LoadVM(const TDesC8* aData)

{

  DP("** DSVPSnapChannel::LoadVM()");  

  TInt err = KErrNone; 

  RET_IF_ERROR(err, Kern::ThreadDesRead(iClientThread, aData, iSendDataBuffer,0));

  TUint32 * ptr = (TUint32*) iSendDataBuffer.Ptr();  

  WriteReg(ESnapshot_Address, Epoc::LinearToPhysical((TUint32)ptr));

  return ReadReg(ESnapshot_Address);

}

DECLARE_EXTENSION_LDD()

{

  // FIXME: Not needed?

  DP("** (SVPSNAPDRIVER) DSVPSnapDriverFactory created");

  return new DSVPSnapDriverFactory;

}

DECLARE_STANDARD_EXTENSION()

{

  DP("** (SVPSNAPDRIVER) SVPSnap extension entry point");

  TInt r;

  DSVPSnapDriverFactory* device = new DSVPSnapDriverFactory;

  if (device==NULL)

	r=KErrNoMemory;

  else

	r=Kern::InstallLogicalDevice(device);

  return r;

}