132 lines
3.6 KiB
Groff
132 lines
3.6 KiB
Groff
.\" $NetBSD: lpt.4,v 1.4 2004/01/23 15:59:18 wiz Exp $
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.\"
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.\"
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.\" Copyright (c) 1993 Christopher G. Demetriou
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.\" Copyright (c) 1994 Geoffrey M. Rehmet
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.\" Copyright (c) 1999 Nicolas Souchu
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD: src/share/man/man4/lpt.4,v 1.9.2.2 2001/08/17 13:08:38 ru Exp $
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.\"
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.Dd December 24, 2003
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.Dt LPT 4
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.Os
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.Sh NAME
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.Nm lpt
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.Nd generic printer device driver
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.Sh SYNOPSIS
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.Cd "lpt* at ppbus?"
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.Cd options LPT_DEBUG
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.Cd options LPT_VERBOSE
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.Sh DESCRIPTION
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The
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.Nm
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driver is the port of the lpt driver to the
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.Xr ppbus 4
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system.
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.Pp
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One purpose of this port was to allow parallel port sharing with
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other parallel devices.
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Secondly,
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.Fn inb
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and
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.Fn outb
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calls have been replaced by
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.Xr ppbus 4
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function calls.
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.Nm
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is now arch-independent thanks to the
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.Xr ppbus 4
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interface.
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See
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.Xr ppbus 4
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for more information about the parallel port bus system.
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.Pp
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The parallel port bus is reserved by
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.Nm
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when the printer device is opened and released when the device is
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closed.
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.Pp
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Ports can be configured to use DMA, IEEE negotiations, and IEEE
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compliant transfer modes by using the
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.Xr lptctl 8
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command, with modes depending on the hardware available.
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.Ss Minor bit
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The minor bit selects some device features:
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.Bl -column "Minor Bit" "Function" -offset indent
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.It Em "Minor Bit" Function
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.It 128 Do no use interrupts (polled accesses).
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.It 64 Do not initialize printer when opened.
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.It 32 Automatic LF on CR.
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.El
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.Pp
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.Xr mknod 8
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can be used to create such devices if necessary (see
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.Sx BUGS ) .
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.Sh FILES
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.Bl -tag -width "/dev/lpt0xx" -compact
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.It Pa /dev/lpt?
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interrupt-driven ports (minor number 0)
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.It Pa /dev/lpa?
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polled ports (minor number 128)
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.El
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.Sh SEE ALSO
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.Xr atppc 4 ,
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.Xr ppbus 4 ,
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.Xr lptctl 8 ,
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.Xr mknod 8
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.Sh HISTORY
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This driver is derived from drivers which appear in
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.Fx
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and
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.Nx .
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The
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.Fx
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driver is used for
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.Xr ppbus 4
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usage while the
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.Nx
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driver's behavior is emulated as much as possible for compatibility.
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.Sh AUTHORS
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This manual page was based on the
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.Fx
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.Nm lpt
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manual page.
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The information has been updated for the
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.Nx
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port by Gary Thorpe.
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.Sh BUGS
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If a printer is not connected and on-line,
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.Pa /dev/lpt?
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and
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.Pa /dev/lpa?
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cannot be used with
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.Xr lptctl 8 .
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An lpt device with minor number
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.Em 64
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must be used in this case because it skips the initialization
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sequence.
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.Pp
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Testing has been limited by hardware availability.
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