lockunlock.c

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/*
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 *
 *  Copyright 2006 Spiro Trikaliotis
 *
 */

#include <wdm.h>
#include "cbm_driver.h"
#include "iec.h"

#include "version.h"

NTSTATUS
cbm_lock_parport(IN PDEVICE_EXTENSION Pdx)
{
    NTSTATUS ntStatus;

    FUNC_ENTER();

    DBG_PRINT((DBG_PREFIX "+++ LOCK PARPORT"));
    DBG_ASSERT(Pdx->ParallelPortIsLocked == FALSE);

    ntStatus = ParPortAllocate(Pdx);

    // Set the appropriate mode of the parallel port
    // Normally, this will be either BYTE MODE, or SPP

    if (NT_SUCCESS(ntStatus))
    {
        ntStatus = ParPortSetMode(Pdx);
    }

    // Try to allocate the interrupt

    if (NT_SUCCESS(ntStatus))
    {
        // ntStatus =
        ParPortAllocInterrupt(Pdx, cbm_isr);
    }

    // Initialize the IEC serial port

    if (NT_SUCCESS(ntStatus))
    {
        Pdx->ParallelPortIsLocked = TRUE;

        cbmiec_init(Pdx);
    }

    // Did we fail any call? If yes, free and release
    // any resource we might happen to have allocated
    // before we failed


    if (!NT_SUCCESS(ntStatus))
    {
        // The functions themselves test if the resource
        // is allocated, thus, we do not need to protect
        // against freeing non-allocated resources here.

        ParPortFreeInterrupt(Pdx);
        ParPortUnsetMode(Pdx);
        ParPortFree(Pdx);
    }

    // release the bus (to be able to share it with other
    // controllers

    if (NT_SUCCESS(ntStatus) && !Pdx->DoNotReleaseBus)
    {
        cbmiec_release_bus(Pdx);
    }

    FUNC_LEAVE_NTSTATUS(ntStatus);
}

NTSTATUS
cbm_unlock_parport(IN PDEVICE_EXTENSION Pdx)
{
    FUNC_ENTER();

    DBG_PRINT((DBG_PREFIX "--- UNLOCK PARPORT"));
    DBG_ASSERT(Pdx->ParallelPortIsLocked == TRUE);

    Pdx->ParallelPortIsLocked = FALSE;

    // release the bus (to be able to share it with other controllers)

    if (!Pdx->DoNotReleaseBus)
    {
        cbmiec_release_bus(Pdx);
    }

    // release all resources we have previously allocated

    ParPortFreeInterrupt(Pdx);
    ParPortUnsetMode(Pdx);
    ParPortFree(Pdx);

    FUNC_LEAVE_NTSTATUS_CONST(STATUS_SUCCESS);
}

NTSTATUS
cbm_lock(IN PDEVICE_EXTENSION Pdx)
{
    FUNC_ENTER();

    DBG_PRINT((DBG_PREFIX "*** LOCK"));
    Pdx->ParallelPortLock = TRUE;

    FUNC_LEAVE_NTSTATUS_CONST(STATUS_SUCCESS);
}

NTSTATUS
cbm_unlock(IN PDEVICE_EXTENSION Pdx)
{
    FUNC_ENTER();

    DBG_PRINT((DBG_PREFIX "*** UNLOCK"));
    Pdx->ParallelPortLock = FALSE;

    FUNC_LEAVE_NTSTATUS_CONST(STATUS_SUCCESS);
}

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