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+.\" $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.
+.\"
+.\" 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 February 24, 2011
+.Dt SND_UAUDIO 4
+.Os
+.Sh NAME
+.Nm snd_uaudio
+.Nd USB audio and MIDI 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 and
+.Tn USB
+MIDI 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"
+.%U 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.
+It is necessary to allow the device un-registration to complete
+successfully, otherwise the
+.Tn PCM
+layer will panic.