/*++
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Module Name:

   pppmodem.c

Abstract:

   Implementation of the DCD detection.
   

--*/
#include "digippp.h"
#include "wan_proto.h"
#include "wan_control.h"


VOID
MdmEngine(   
	IN PVOID hEngine )
/*++

Description:

	The worker bee routine which checks the carrier signal

--*/
{
	PDIGI_PPP_MDMENGINE pEngine = hEngine;
	PDIGI_PPP_ADAPTER	pAdapter = pEngine->pAdapter;

	DigiDump( DIGIINIT, ( "PPP!MdmEngine: Starting.  pEngine 0x%x, pAdapter 0x%x\n", pEngine, pAdapter ) );

	ASSERT( pEngine->Type == DIGI_PPP_TYPE_MDMENGINE );
	ASSERT( pAdapter->Type == DIGI_PPP_TYPE_ADAPTER );

	for (;;)
	{
		DigiAcquireSpinLock( &pEngine->Lock );
		if ( pEngine->fHalt )
		{
			DigiDump( DIGIMDMENGINE, ( "PPP!MdmEngine: Halt detected, pEngine 0x%x \n", pEngine ) );
			DigiReleaseSpinLock( &pEngine->Lock );
			break;
		}
		DigiReleaseSpinLock( &pEngine->Lock );

		// Ask the card for current state of control signals (interested in DCD)
		{
			ULONG error;	
			NTSTATUS	status;
			struct wan_mdmioc modemIoctlBlock;
			modemIoctlBlock.snid = pEngine->pAdapter->Snid;
			modemIoctlBlock.mask = W_DCD ;
			modemIoctlBlock.signals = (ULONG) 0;

			status = DsIoctl( pEngine->hStream, W_GETMODEM, &modemIoctlBlock, sizeof(modemIoctlBlock), &error );
			if ( NT_SUCCESS(status) )
			{
				if ( !(modemIoctlBlock.signals & W_DCD) )
					PPPCallOnConnend( pAdapter->pLines[pEngine->iLine].pCall );
			}
		}
  	NdisMSleep( ONE_MILLISECOND * 20 );
	}
	DigiDump( DIGIINIT, ( "PPP!MdmEngine: Stopped.  pEngine 0x%x, pAdapter 0x%x\n", pEngine, pAdapter ) );
}


VOID
MdmEngineStop( 
	IN PDIGI_PPP_MDMENGINE pEngine )
/*++

Description:

	Stops the modem signal thread.
--*/
{
	DigiDump( DIGIMDMENGINE, ( "PPP!MdmEngineStop: pEngine 0x%x\n", pEngine ) );

	if ( pEngine->fStarted )
	{
		DigiAcquireSpinLock( &pEngine->Lock );
		pEngine->fHalt = TRUE;
		DigiReleaseSpinLock( &pEngine->Lock );

 		(void)KeWaitForSingleObject( pEngine->pThread, Executive, KernelMode, TRUE, 0 );
		ObDereferenceObject( pEngine->pThread );	 
		pEngine->pThread = NULL; 

		pEngine->fStarted = FALSE;
	}
}


NTSTATUS
MdmEngineStart(
	IN PDIGI_PPP_MDMENGINE	    pEngine,
	IN PDIGI_PPP_ADAPTER        pAdapter,
	IN HANDLE                   hStream 
	)
/*++

Description:

	Starts the engine, which immediately starts sending Ioctl requests.  Requires a 
	previously opened dxb stream.

Parameters

	pEngine
		Address of struct to store engine parameters.

	pAdapter
		Address of adapter data

	hStream
		Previously opened dxb stream (opened via DsOpen or DsOpenEx).

	pDispatchTable
		Table of function pointers to handlers for incoming PPP messages and data.

--*/
{
	PKTHREAD hThread;
	PKTHREAD pThread;
	NTSTATUS Status;

	DigiDump( DIGIMDMENGINE, ( "PPP!MdmEngineStart: pEngine 0x%x\n", pEngine) );

	pEngine->Type         = DIGI_PPP_TYPE_MDMENGINE;
	pEngine->pAdapter     = pAdapter;
	pEngine->hStream      = hStream;
	pEngine->fHalt        = FALSE;

	DigiInitializeSpinLock( &pEngine->Lock );

	Status = PsCreateSystemThread( &hThread, THREAD_ALL_ACCESS, NULL, 0, NULL, MdmEngine, pEngine );
	if ( NT_SUCCESS( Status ) )
	{
		Status = ObReferenceObjectByHandle( hThread, THREAD_ALL_ACCESS, NULL, KernelMode, &pThread, NULL );
		ZwClose( hThread );

		if ( NT_SUCCESS( Status ) )
		{
			pEngine->fStarted = TRUE;
			pEngine->pThread = pThread;
		}
		else
		{
			// Tell thread to stop.  
			DigiDump( DIGIERROR, ( "PPP!MdmEngineStart: ObReferenceObject failed, status 0x%x\n", Status ) );
			pEngine->fHalt = TRUE;
		}
	}
	return Status;
}


NTSTATUS
MdmDropDtrRts(
	IN PDIGI_PPP_LINE pLine )
{
	struct wan_mdmioc modemIoctlBlock = {0};
	NTSTATUS	status;	
	ULONG error;
	DigiDump( DIGIMDMENGINE, ( "PPP!MdmDropDrRts: pLine 0x%x\n", pLine ) );

	modemIoctlBlock.snid = pLine->Snid;
	modemIoctlBlock.signals = ~(W_DTR | W_RTS);
	modemIoctlBlock.mask = W_DTR | W_RTS;
	status = DsIoctl( pLine->hStream, W_SETMODEM, &modemIoctlBlock, sizeof modemIoctlBlock, &error );
	return status;
}


NTSTATUS
MdmRaiseDtrRts(
	IN PDIGI_PPP_LINE pLine )
{
	struct wan_mdmioc modemIoctlBlock = {0};
	NTSTATUS	status;	
	ULONG error;
	
		DigiDump( DIGIMDMENGINE, ( "PPP!MdmRaiseDrRts: pLine 0x%x\n", pLine ) );	
	modemIoctlBlock.snid = pLine->Snid;
	modemIoctlBlock.signals = modemIoctlBlock.mask = W_DTR | W_RTS;
	status = DsIoctl( pLine->hStream, W_SETMODEM, &modemIoctlBlock, sizeof modemIoctlBlock, &error );
	return status;
}
