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device-side (and only device-side) "virtual USB serial adapters" - the ones you can get with an OTG-capable board - as consoles. It boils down to adding the device name to kern.console sysctl, although doing that requires jumping through some hoops. It doesn't change the actual operation of those virtual devices. The point is to make it possible for init(8) to recognize them as console devices and to launch getty(8) for them, when configured as "onifconsole" in ttys(5). The point of that, in turn, is to add such entries to the default ttys(5), so that init(8) will launch gettys for device-side "virtual serial adapters", but not for actual USB serial dongles. Reviewed by: hselasky@ No objections: imp@ MFC after: 2 weeks Sponsored by: The FreeBSD Foundation
166 lines
4.2 KiB
Groff
166 lines
4.2 KiB
Groff
.\" $NetBSD: ucom.4,v 1.9 2002/03/22 00:39:40 augustss Exp $
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.\"
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.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Lennart Augustsson.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd April 25, 2018
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.Dt UCOM 4
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.Os
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.Sh NAME
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.Nm ucom
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.Nd USB tty support
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following line in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device ucom"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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ucom_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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driver attaches to USB modems, serial ports, and other devices that need
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to look like a tty.
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The
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.Nm
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driver shows a behavior like a
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.Xr tty 4 .
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This means that normal programs such as
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.Xr tip 1
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or
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.Xr ppp 8
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can be used to access the device.
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.Sh SYSCTL VARIABLES
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The following variables are available as both
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.Xr sysctl 8
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variables and
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.Xr loader 8
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tunables:
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.Bl -tag -width indent
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.It Va hw.usb.ucom.debug
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Debug output level, where 0 is debugging disabled and larger values increase
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debug message verbosity.
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Default is 0.
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.It Va hw.usb.ucom.device_mode_console
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When set to 1, the
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.Nm
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driver will mark terminals as console devices when operating in device mode.
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Default is 1.
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.It Va hw.usb.ucom.pps_mode
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Enables and configure PPS capture mode as described below.
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.Sh Pulse Per Second (PPS) Timing Interface
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The
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.Nm
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driver can capture PPS timing information as defined in RFC 2783.
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The API, accessed via
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.Xr ioctl 2 ,
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is available on the tty device.
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To use the PPS capture feature with
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.Xr ntpd 8 ,
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symlink the tty device to
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.Va /dev/pps0.
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.Pp
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The
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.Va hw.usb.ucom.pps_mode
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sysctl configures the PPS capture mode.
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It can be set in
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.Xr loader.conf 5
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or
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.Xr sysctl.conf 5 .
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The following capture modes are available:
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.Bl -tag -compact -offset "mmmm" -width "mmmm"
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.It 0
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Capture disabled (default).
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.It 1
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Capture pulses on the CTS line.
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.It 2
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Capture pulses on the DCD line.
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.El
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.Sh FILES
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.Bl -tag -width "/dev/ttyU*.init" -compact
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.It Pa /dev/ttyU*
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for callin ports
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.It Pa /dev/ttyU*.init
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.It Pa /dev/ttyU*.lock
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corresponding callin initial-state and lock-state devices
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.Pp
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.It Pa /dev/cuaU*
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for callout ports
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.It Pa /dev/cuaU*.init
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.It Pa /dev/cuaU*.lock
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corresponding callout initial-state and lock-state devices
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.El
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.Sh SEE ALSO
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.Xr tty 4 ,
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.Xr uark 4 ,
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.Xr ubsa 4 ,
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.Xr ubser 4 ,
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.Xr uchcom 4 ,
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.Xr ucycom 4 ,
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.Xr ufoma 4 ,
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.Xr uftdi 4 ,
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.Xr uhso 4 ,
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.\".Xr ugensa 4 ,
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.Xr uipaq 4 ,
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.Xr umcs 4 ,
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.Xr umct 4 ,
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.Xr umodem 4 ,
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.Xr umoscom 4 ,
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.Xr uplcom 4 ,
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.Xr usb 4 ,
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.Xr uslcom 4 ,
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.Xr uvisor 4 ,
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.Xr uvscom 4
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.Sh HISTORY
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The
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.Nm
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driver was adopted from
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.Nx
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in March of 2002.
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This manual page was adopted from
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.Nx
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by
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.An Tom Rhodes Aq Mt trhodes@FreeBSD.org
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in April 2002.
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.Sh BUGS
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Prior to
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.Fx 6.0
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.Nm
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created
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.Pa /dev/ucom?
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rather than the uniform device names created today.
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Old scripts must be adjusted accordingly.
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