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Diffstat (limited to 'share/man/man4/lpt.4')
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diff --git a/share/man/man4/lpt.4 b/share/man/man4/lpt.4 new file mode 100644 index 000000000000..8b3dd578fa3c --- /dev/null +++ b/share/man/man4/lpt.4 @@ -0,0 +1,98 @@ +.\" +.\" Copyright (c) 1993 Christopher G. Demetriou +.\" Copyright (c) 1994 Geoffrey M. Rehmet +.\" Copyright (c) 1999 Nicolas Souchu +.\" All rights reserved. +.\" +.\" 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. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. +.\" +.\" $FreeBSD$ +.\" +.Dd February 14, 1999 +.Dt LPT 4 +.Os +.Sh NAME +.Nm lpt +.Nd generic printer device driver +.Sh SYNOPSIS +.Cd "device ppc" +.Cd "device ppbus" +.Cd "device lpt" +.Sh DESCRIPTION +The current +.Em lpt +driver is the port of the original lpt driver to the +.Xr ppbus 4 +system. +.Pp +One purpose of this port was to allow parallel port sharing with other +parallel devices. +Secondly, inb()/outb() calls have been replaced by ppbus +function calls. +lpt is now arch-independent thanks to the ppbus interface. +See +.Xr ppbus 4 +for more info about the ppbus system. +.Pp +The parallel port bus is allocated by lpt when the printer device is opened +and released only when the transfer is completed: either when the device +is closed or when the entire buffer is sent in interrupt driven mode. +.Pp +The driver can be configured to be either interrupt-driven, or +to poll the printer. +Ports that are configured to be +interrupt-driven can be switched to polled mode by using the +.Xr lptcontrol 8 +command. +.Pp +Depending on your hardware, extended capabilities may be configured with the +.Xr lptcontrol 8 +command. +With an ECP/ISA port, you can take advantage +of FIFO and DMA. +.Pp +In order to retrieve printer info from /dev/lpt0, just apply the +.Nm cat +command to the device. +If the printer supports IEEE1284 nibble mode and has +data to send to the host, you will get it. +.Sh FILES +.Bl -tag -width Pa -compact +.It Pa /dev/lpt0 +first parallel port driver +.El +.Sh SEE ALSO +.Xr ppbus 4 , +.Xr ppc 4 , +.Xr lptcontrol 8 +.Sh HISTORY +This driver replaces the functionality of the lpa +driver, which is now defunct. +.Sh BUGS +There are lots of them, especially in cheap parallel port implementations. +.Pp +It is only possible to open a lpt port when a printer is connected and +on-line, making it impossible to run +.Xr lptcontrol 8 +when there is no printer connected. +.Pp +This driver could still stand a rewrite. |