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author | nsouch <nsouch@FreeBSD.org> | 1999-02-14 12:06:16 +0000 |
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committer | nsouch <nsouch@FreeBSD.org> | 1999-02-14 12:06:16 +0000 |
commit | 27a54e2a9c62ef42f767684a38824d3be810885b (patch) | |
tree | 1157a0cd1eac9465855e5d689f6bd147c367464b /share/man/man4/lpt.4 | |
parent | ad25a63490d03422a17b52c5f4e7bd3560da9dcc (diff) | |
download | FreeBSD-src-27a54e2a9c62ef42f767684a38824d3be810885b.zip FreeBSD-src-27a54e2a9c62ef42f767684a38824d3be810885b.tar.gz |
Create new lpt manpage with ppbus info and the original lpt info.
Fix lp.4 ppbus terminology.
Diffstat (limited to 'share/man/man4/lpt.4')
-rw-r--r-- | share/man/man4/lpt.4 | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/share/man/man4/lpt.4 b/share/man/man4/lpt.4 new file mode 100644 index 0000000..5b08cbe --- /dev/null +++ b/share/man/man4/lpt.4 @@ -0,0 +1,103 @@ +.\" +.\" Copyright (c) 1993 Christopher G. Demetriou +.\" Copyright (c) 1994 Geoffrey M. Rehmet +.\" Copyright (c) 1998 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. +.\" +.\" +.Dd February 14, 1999 +.Dt LPT 4 +.Os FreeBSD +.Sh NAME +.Nm lpt +.Nd +Generic printer device driver +.Sh SYNOPSIS +.Cd "controller ppbus" +.Cd "device lpt at ppbus?" +.Pp +.Cd "controller ppc0 at isa? port" \&"IO_LPT1\&" tty irq 7 +.Cd "controller ppc1 at isa? port" \&"IO_LPT2\&" tty irq 7 +.Cd "controller ppc2 at isa? port" \&"IO_LPT3\&" tty irq 7 +.Pp +For BIOS-probed ports: +.Cd "controller ppc0 at isa? port? tty irq 7" +.Pp +For polled ports: +.Cd "controller ppc0 at isa? port? tty" +.Cd "controller ppc1 at isa? port" \&"IO_LPT2\&" tty +.Pp +For DMA capable parallel port: +.Cd "controller ppc0 at isa? port? tty irq 7 drq 1" +.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 (use the -e option). With an ECP/ISA port, you can take advantage +of FIFO and DMA. +.Sh SEE ALSO +.Xr ppbus 4 , +.Xr lptcontrol 8 +.Sh HISTORY +This driver replaces the functionality of the lpa +driver, which is now defunct. +.Sh FILES +.Bl -tag -width Pa -compact +.It Pa /dev/lpt0 +first parallel port driver +.El +.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 +Please, ensure the +.Xr ppc 4 +entry in you MACHINE file has the tty interrupt mask. +.Pp +This driver could still stand a rewrite. |