poll.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 1999-2004 Michael Klein <michael(dot)klein(at)puffin(dot)lb(dot)shuttle(dot)de>
 *  Copyright 2001-2004 Spiro Trikaliotis
 *
 */

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

NTSTATUS
cbmiec_iec_poll(IN PDEVICE_EXTENSION Pdx, OUT PUCHAR Result)
{
    UCHAR ch;

    FUNC_ENTER();

    ch = READ_PORT_UCHAR(IN_PORT);

    *Result = 0;

    if((ch & PP_DATA_IN) == 0) *Result |= IEC_LINE_DATA;
    if((ch & PP_CLK_IN)  == 0) *Result |= IEC_LINE_CLOCK;
    if((ch & PP_ATN_IN)  == 0) *Result |= IEC_LINE_ATN;
    if((ch & PP_RESET_IN)== 0) *Result |= IEC_LINE_RESET;

    FUNC_LEAVE_NTSTATUS_CONST(STATUS_SUCCESS);
}