FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/lptreg.h

     /*      $NetBSD: lptreg.h,v 1.10 2006/05/02 08:31:02 martin Exp $       */
     
     /*-
      * Copyright (c) 1990 The Regents of the University of California.
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * William Jolitz.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)lptreg.h    1.1 (Berkeley) 12/19/90
     */
    
    /*
     * AT Parallel Port (for lineprinter)
     * Interface port and bit definitions
     * Written by William Jolitz 12/18/90
     * Copyright (C) William Jolitz 1990
     */
    
    /*
     * On a standard DB25 parallel port, the bits show up as follows:
     *
     *   13   12   11   10    9    8    7    6    5    4    3    2    1
     *   S4   S5  ~S7   S6   D7   D6   D5   D4   D3   D2   D1   D0  ~C0
     *
     *      G    G    G    G    G    G    G    G   ~C3   C2   S3  ~C1
     *      25   24   23   22   21   20   19   18   17   16   15   14
     *
     *  D7-D0 are output bits from the data register
     *  S7-S3 are input bits read at the status register
     *  C3-C0 are output bits from the control register
     */
    
    #define lpt_data        0       /* Data to/from printer (R/W) */
    
    #define lpt_status      1       /* Status of printer (R) */
    #define LPS_NERR                0x08    /* printer no error */
    #define LPS_SELECT              0x10    /* printer selected */
    #define LPS_NOPAPER             0x20    /* printer out of paper */
    #define LPS_NACK                0x40    /* printer no ack of data */
    #define LPS_NBSY                0x80    /* printer not busy */
    
    #define lpt_control     2       /* Control printer (R/W) */
    #define LPC_STROBE              0x01    /* strobe data to printer */
    #define LPC_AUTOLF              0x02    /* automatic linefeed */
    #define LPC_NINIT               0x04    /* initialize printer */
    #define LPC_SELECT              0x08    /* printer selected */
    #define LPC_IENABLE             0x10    /* printer out of paper */
    
    #define LPT_NPORTS      4

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