)
{
    PREFAST_DEBUGCHK(pContext);
    DEBUGCHK(!pContext->hevInterrupt);
    DEBUGCHK(!pContext->hIST);
    DEBUGCHK(!pContext->fRunning);

    pContext->dwSig = GARBAGE_DWORD;

    UnmapRegisterSet(pContext);

    if (pContext->hBusAccess) CloseBusAccessHandle(pContext->hBusAccess);
    
    if (pContext->dwSysIntr) {
        KernelIoControl(IOCTL_HAL_DISABLE_WAKE, &pContext->dwSysIntr,  
    	    sizeof(pContext->dwSysIntr), NULL, 0, NULL);
    }

    if (pContext->dwIrq != IRQ_UNSPECIFIED) {
        KernelIoControl(IOCTL_HAL_RELEASE_SYSINTR, &pContext->dwIrq, 
            sizeof(DWORD), NULL, 0, NULL);
    }
    
    DeleteCriticalSection(&pContext->csIndexedRegisterAccess);

    LocalFree(pContext);
}


DWORD
WINAPI
UfnPdd_Deinit(
    PVOID pvPddContext
    )
{
    SETFNAME();
    FUNCTION_ENTER_MSG();

    PCTRLR_PDD_CONTEXT pContext = (PCTRLR_PDD_CONTEXT) pvPddContext;
    ValidateContext(pContext);

    FUNCTION_ENTER_MSG();

    FreeCtrlrContext(pContext);

    FUNCTION_LEAVE_MSG();

    return ERROR_SUCCESS;
}


DWORD
WINAPI
UfnPdd_Start(
    PVOID        pvPddContext
    )
{
    SETFNAME();
    FUNCTION_ENTER_MSG();

    DWORD dwRet;
    PCTRLR_PDD_CONTEXT pContext = (PCTRLR_PDD_CONTEXT) pvPddContext;
    ValidateContext(pContext);

    FUNCTION_ENTER_MSG();

    DEBUGCHK(!pContext->fRunning);

    BOOL fIntInitialized = FALSE;

    // Create the interrupt event
    pContext->hevInterrupt = CreateEvent(0, FALSE, FALSE, NULL);
    if (pContext->hevInterrupt == NULL) {
        dwRet = GetLastError();
        DEBUGMSG(ZONE_ERROR, (_T("%s Error creating  interrupt event. Error = %d\r\n"), 
            pszFname, dwRet));
        goto EXIT;
    }

    fIntInitialized = InterruptInitialize(pContext->dwSysIntr, 
        pContext->hevInterrupt, NULL, 0);
    if (fIntInitialized == FALSE) {
        dwRet = ERROR_GEN_FAILURE;
        DEBUGMSG(ZONE_ERROR, (_T("%s  interrupt initialization failed\r\n"),
            pszFname));
        goto EXIT;
    }
    InterruptDone(pContext->dwSysIntr);

    pContext->fExitIST = FALSE;
    pContext->hIST = CreateThread(NULL, 0, ISTMain, pContext, 0, NULL);    
    if (pContext->hIST == NULL) {
        DEBUGMSG(ZONE_ERROR, (_T("%s IST creation failed\r\n"), pszFname));
        dwRet = GetLastError();
        goto EXIT;
    }

    pContext->fRunning = TRUE;
    dwRet = ERROR_SUCCESS;

EXIT:
    if (pContext->fRunning == FALSE) {
        DEBUGCHK(dwRet != ERROR_SUCCESS);
        if (fIntInitialized) InterruptDisable(pContext->dwSysIntr);
        if (pContext->hevInterrupt) CloseHandle(pContext->hevInterrupt);
        pContext->hevInterrupt = NULL;
    }

    FUNCTION_LEAVE_MSG();

    return dwRet;
}


// Stop the device.
DWORD
WINAPI
UfnPdd_Stop(
            PVOID pvPddContext
            )
{
    SETFNAME();
    FUNCTION_ENTER_MSG();

    PCTRLR_PDD_CONTEXT pContext = (PCTRLR_PDD_CONTEXT) pvPddContext;
    ValidateContext(pContext);

    DEBUGCHK(pContext->fRunning);

    // Stop the IST
    pContext->fExitIST = TRUE;
    InterruptDisable(pContext->dwSysIntr);
    SetEvent(pContext->hevInterrupt);
    WaitForSingleObject(pContext->hIST, INFINITE);
    CloseHandle(pContext->hevInterrupt);
    CloseHandle(pContext->hIST);
    pContext->hIST = NULL;
    pContext->hevInterrupt = NULL;

    ResetDevice(pContext);

    pContext->fRunning = FALSE;

    DEBUGMSG(ZONE_FUNCTION, (_T("%s Device has been stopped\r\n"), 
        pszFname));

    FUNCTION_LEAVE_MSG();

    return ERROR_SUCCESS;
}


DWORD 
WINAPI 
UfnPdd_IsConfigurationSupportable(
    PVOID                       pvPddContext,
    UFN_BUS_SPEED               Speed,
    PUFN_CONFIGURATION          pConfiguration
    )
{
    SETFNAME();
    FUNCTION_ENTER_MSG();

    DEBUGCHK(Speed == BS_FULL_SPEED);

    PCTRLR_PDD_CONTEXT pContext = (PCTRLR_PDD_CONTEXT) pvPddContext;
    ValidateContext(pContext);

    // This PDD does not have any special requirements that cannot be 
    // handled through IsEndpointSupportable.
    DWORD dwRet = ERROR_SUCCESS;

    FUNCTION_LEAVE_MSG();

    return dwRet;
}


// 
// Is this endpoint supportable.
DWORD
WINAPI
UfnPdd_IsEndpointSupportable(
    PVOID                       pvPddContext,
    DWORD                       dwEndpoint,
    UFN_BUS_SPEED               Speed,
    PUSB_ENDPOINT_DESCRIPTOR    pEndpointDesc,
    BYTE                        bConfigurationValue,
    BYTE                        bInterfaceNumber,
    BYTE                        bAlternateSetting
    )
{
    SETFNAME();
    FUNCTION_ENTER_MSG();

    DEBUGCHK(EP_VALID(dwEndpoint));
    DEBUGCHK(Speed == BS_FULL_SPEED);

    DWORD dwRet = ERROR_SUCCESS;
    PCTRLR_PDD_CONTEXT pContext = (PCTRLR_PDD_CONTEXT) pvPddContext;
    ValidateContext(pContext);

    PEP_STATUS peps = GetEpStatus(pContext, dwEndpoint);

    // Special case for endpoint 0
    if (dwEndpoint == 0) {
        DEBUGCHK(pEndpointDesc->bmAttributes == USB_ENDPOINT_TYPE_CONTROL);
        
        // Endpoint 0 only supports 8 or 16 byte packet size
        if (pEndpointDesc->wMaxPacketSize < EP_0_PACKET_SIZE) {
            DEBUGMSG(ZONE_ERROR, (_T("%s Endpoint 0 only supports %u byte packets\r\n"),
                pszFname, EP_0_PACKET_SIZE));
            dwRet = ERROR_INVALID_PARAMETER;
        }
        else{  
            // Larger than EP 0 Max Packet Size - reduce to Max
            pEndpointDesc->wMaxPacketSize = EP_0_PACKET_SIZE;
        }
    }
    else if (dwEndpoint < ENDPOINT_COUNT) {
        BYTE bTransferType = pEndpointDesc->bmAttributes & USB_ENDPOINT_TYPE_MASK;
        DEBUGCHK(bTransferType != USB_ENDPOINT_TYPE_CONTROL);

        // Validate and adjust packet size
        WORD wPacketSize = 
            (pEndpointDesc->wMaxPacketSize & USB_ENDPOINT_MAX_PACKET_SIZE_MASK);

        switch(bTransferType) {

        // Isoch not currently supported by Samsung HW
        case USB_ENDPOINT_TYPE_ISOCHRONOUS:
            DEBUGMSG(ZONE_ERROR, (_T("%s Isochronous endpoints are not supported\r\n"),
                pszFname));
            dwRet = ERROR_INVALID_PARAMETER;
            break;

        case USB_ENDPOINT_TYPE_BULK:
        case USB_ENDPOINT_TYPE_INTERRUPT:
            // HW Can only Support 8, 16, 32, 64 byte packets
            if((wPacketSize >= 8) && (wPacketSize < 16)){
                wPacketSize = 8;
            }
            else if ((wPacketSize >= 16) && (wPacketSize < 64)){
                // Note that 32 => Dual Packet mode - Do NOT allow
                wPacketSize = 16;
            }
            else if (wPacketSize >= 64 ){
                wPacketSize = 64;                
            }
            else{ // wPacketSize < 8
                dwRet = ERROR_INVALID_PARAMETER;
            }
            break;

        default:
            dwRet = ERROR_INVALID_PARAMETER;
            break;
        }  
        
        // If Requested Size is larger than what is supported ... change it.
        // Note only try and change it if no errors so far... meaning Ep is
        // Supportable.
        if ( (wPacketSize != (pEndpointDesc->wMaxPacketSize & USB_ENDPOINT_MAX_PACKET_SIZE_MASK)) && 
             (dwRet == ERROR_SUCCESS) ) {
            pEndpointDesc->wMaxPacketSize &= ~USB_ENDPOINT_MAX_PACKET_SIZE_MASK;
            pEndpointDesc->wMaxPacketSize |= wPacketSize;
        }
    }

    FUNCTION_LEAVE_MSG();

    return dwRet;
}


// Clear an endpoint stall.
DWORD
WINAPI
UfnPdd_ClearEndpointStall(
                          PVOID pvPddContext,
                          DWORD dwEndpoint
                          )
{
    DWORD dwRet = ERROR_SUCCESS;

    SETFNAME();
    FUNCTION_ENTER_MSG();

    DEBUGCHK(EP_VALID(dwEndpoint));

    PCTRLR_PDD_CONTEXT pContext = (PCTRLR_PDD_CONTEXT) pvPddContext;
    ValidateContext(pContext);

    PEP_STATUS peps = GetEpStatus(pContext, dwEndpoint);
    LOCK_ENDPOINT(peps);

    if (dwEndpoint == 0){
        // Must Clear both Send and Sent Stall
        WriteIndexedReg(pContext, 0, EP0_CSR_REG_OFFSET, 0);
    }
    else if (peps->dwDirectionAssigned == USB_IN_TRANSFER){
        SetClearIndexedReg(pContext, dwEndpoint, IN_CSR1_REG_OFFSET,
            (IN_SEND_STALL | IN_CLR_DATA_TOGGLE ), SET);

        // Must Clear both Send and Sent Stall
        SetClearIndexedReg(pContext, dwEndpoint, IN_CSR1_REG_OFFSET,
            (IN_SEND_STALL  | IN_SENT_STALL), CLEAR);               
    }
    else{ // Out Endpoint
        // Must Clear both Send and Sent Stall
        SetClearIndexedReg(pContext, dwEndpoint, OUT_CSR1_REG_OFFSET,
            ( OUT_SEND_STALL | OUT_CLR_DATA_TOGGLE ), SET);
        SetClearIndexedReg(pContext ,dwEndpoint, OUT_CSR1_REG_OFFSET,
            ( OUT_SEND_STALL  | OUT_SENT_STALL), CLEAR);
    }
    
    UNLOCK_ENDPOINT(peps);
    FUNCTION_LEAVE_MSG();

    return ERROR_SUCCESS;
}


// Initialize an endpoint.
DWORD
WINAPI
UfnPdd_InitEndpoint(
    PVOID                       pvPddContext,
    DWORD                       dwEndpoint,
    UFN_BUS_SPEED               Speed,
    PUSB_ENDPOINT_DESCRIPTOR    pEndpointDesc,
    PVOID                       pvReserved,
    BYTE                        bConfigurationValue,
    BYTE                        bInterfaceNumber,
    BYTE                        bAlternateSetting
    )
{
    SETFNAME();
    FUNCTION_ENTER_MSG();

    DEBUGCHK(EP_VALID(dwEndpoint));
    PREFAST_DEBUGCHK(pEndpointDesc);

#ifdef DEBUG
    {
        USB_ENDPOINT_DESCRIPTOR EndpointDesc;
        memcpy(&EndpointDesc, pEndpointDesc, sizeof(EndpointDesc));
        DEBUGCHK(UfnPdd_IsEndpointSupportable(pvPddContext, dwEndpoint, Speed,
            &EndpointDesc, bConfigurationValue, bInterfaceNumber, 
            bAlternateSetting) == ERROR_SUCCESS);
        DEBUGCHK(memcmp(&EndpointDesc, pEndpointDesc, sizeof(EndpointDesc)) == 0);
    }
#endif

    PCTRLR_PDD_CONTEXT pContext = (PCTRLR_PDD_CONTEXT) pvPddContext;
    ValidateContext(pContext);
    BYTE bEndpointAddress = 0;

    PEP_STATUS peps = GetEpStatus(pContext, dwEndpoint);
    DEBUGCHK(!peps->fInitialized);

    InitializeCriticalSection(&peps->cs);

    WORD wMaxPacketSize = 
        pEndpointDesc->wMaxPacketSize & USB_ENDPOINT_MAX_PACKET_SIZE_MASK;
    DEBUGCHK(wMaxPacketSize);
    
    // If the target is endpoint 0, then only allow the function driver 
    // to register a notification function.
    if (dwEndpoint == 0) {
       peps->dwPacketSizeAssigned = wMaxPacketSize;
       // Interrupts for endpoint 0 are enabled in ISTMain
    }
    else if (dwEndpoint < ENDPOINT_COUNT) {
        // Clear all Status bits and leave the Endpoint interrupt disabled
        // Clear Fifos, and all register bits
        ResetEndpoint(pContext,peps);

        // Clear all bits in CSR2 - Disable DMA for now...
        WriteIndexedReg(pContext, dwEndpoint, IN_CSR2_REG_OFFSET, 0); 

        // Setup Direction (mode_in bit) 
        bEndpointAddress = pEndpointDesc->bEndpointAddress;
        BOOL fModeOut = USB_ENDPOINT_DIRECTION_OUT(bEndpointAddress);
        if (fModeOut) {
            SetClearIndexedReg(pContext, dwEndpoint,IN_CSR2_REG_OFFSET, 
                SET_MODE_IN, CLEAR);              
            peps->dwDirectionAssigned = USB_OUT_TRANSFER;
        }
        else {
            SetClearIndexedReg(pContext, dwEndpoint, IN_CSR2_REG_OFFSET, 
                SET_MODE_IN, SET);
            peps->dwDirectionAssigned = USB_IN_TRANSFER;
        }

        // Set Transfer Type
        BYTE bTransferType = pEndpointDesc->bmAttributes & USB_ENDPOINT_TYPE_MASK;
        DEBUGCHK(bTransferType != USB_ENDPOINT_TYPE_CONTROL);
        switch(bTransferType) {
            case USB_ENDPOINT_TYPE_ISOCHRONOUS:
                // Set the ISO bit
                SetClearIndexedReg(pContext, dwEndpoint,IN_CSR2_REG_OFFSET, 
                    SET_TYPE_ISO, SET);
                break;

            case USB_ENDPOINT_TYPE_BULK:
            case USB_ENDPOINT_TYPE_INTERRUPT:
            default:
                // Clear ISO bit - Set type to Bulk
                SetClearIndexedReg(pContext, dwEndpoint,IN_CSR2_REG_OFFSET, 
                    SET_TYPE_ISO, CLEAR);
        }

        peps->dwEndpointType = bTransferType;
        peps->dwPacketSizeAssigned = wMaxPacketSize;
        
        // Set the Max Packet Size Register
        BYTE maxPacketBits = (BYTE) (peps->dwPacketSizeAssigned >> 3);
        WriteIndexed