109 lines
3.5 KiB
Groff
109 lines
3.5 KiB
Groff
.\" $NetBSD: uaudio.4,v 1.15 2002/02/12 19:53:57 jdolecek Exp $
|
|
.\"
|
|
.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to The NetBSD Foundation
|
|
.\" by Lennart Augustsson.
|
|
.\"
|
|
.\" 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. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the NetBSD
|
|
.\" Foundation, Inc. and its contributors.
|
|
.\" 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 December 15, 2005
|
|
.Dt SND_UAUDIO 4
|
|
.Os
|
|
.Sh NAME
|
|
.Nm snd_uaudio
|
|
.Nd USB audio device driver
|
|
.Sh SYNOPSIS
|
|
To compile this driver into the kernel, place the following lines in your
|
|
kernel configuration file:
|
|
.Bd -ragged -offset indent
|
|
.Cd "device sound"
|
|
.Cd "device usb"
|
|
.Cd "device snd_uaudio"
|
|
.Ed
|
|
.Pp
|
|
Alternatively, to load the driver as a module at boot time, place the
|
|
following line in
|
|
.Xr loader.conf 5 :
|
|
.Bd -literal -offset indent
|
|
snd_uaudio_load="YES"
|
|
.Ed
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
driver provides support for
|
|
.Tn USB
|
|
audio class devices.
|
|
.Pp
|
|
A
|
|
.Tn USB
|
|
audio device consists of a number of components:
|
|
input terminals (e.g.\& USB digital input), output terminals (e.g.\&
|
|
speakers), and a number of units in between (e.g.\& volume control).
|
|
.Pp
|
|
Refer to the
|
|
.Ql USB Audio Class Specification
|
|
for more information.
|
|
.Sh SEE ALSO
|
|
.Xr sound 4 ,
|
|
.Xr usb 4
|
|
.Rs
|
|
.%T "USB Audio Class Specifications"
|
|
.%O http://www.usb.org/developers/devclass_docs/
|
|
.Re
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
driver first appeared in
|
|
.Fx 4.7 .
|
|
.Sh AUTHORS
|
|
This manual page was adopted from
|
|
.Nx 1.6
|
|
and modified for
|
|
.Fx
|
|
by
|
|
.An Hiten Pandya Aq hmp@FreeBSD.org .
|
|
.Sh BUGS
|
|
The
|
|
.Tn PCM
|
|
framework in
|
|
.Fx ,
|
|
as of this writing, does not handle device un-registrations in a properly
|
|
abstracted manner, i.e., a detach request is refused by the
|
|
.Tn PCM
|
|
framework if the device is in use.
|
|
For
|
|
.Tn USB
|
|
and supposedly other detach-able busses, it is necessary to allow the
|
|
device un-registration to complete successfully, otherwise the driver
|
|
leaves wild pointers to invalid data structures and thus leading to a panic.
|