/*	$NetBSD: lptreg.h,v 1.8 2005/02/27 00:27:02 perry Exp $	*/

#ifndef LPTREG_H
#define LPTREG_H

/*-
 * 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
 *  ~S7   S6   S5   S4   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 no ack of data */

#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

#endif	/*  LPTREG_H  */
