1.\" $FreeBSD$ 2.\" $NetBSD: uaudio.4,v 1.15 2002/02/12 19:53:57 jdolecek Exp $ 3.\" 4.\" Copyright (c) 1999 The NetBSD Foundation, Inc. 5.\" All rights reserved. 6.\" 7.\" This code is derived from software contributed to The NetBSD Foundation 8.\" by Lennart Augustsson. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 3. All advertising materials mentioning features or use of this software 19.\" must display the following acknowledgement: 20.\" This product includes software developed by the NetBSD 21.\" Foundation, Inc. and its contributors. 22.\" 4. Neither the name of The NetBSD Foundation nor the names of its 23.\" contributors may be used to endorse or promote products derived 24.\" from this software without specific prior written permission. 25.\" 26.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36.\" POSSIBILITY OF SUCH DAMAGE. 37.\" 38.Dd November 10, 2003 39.Dt UAUDIO 4 40.Os 41.Sh NAME 42.Nm uaudio 43.Nd USB audio device driver 44.Sh SYNOPSIS 45.Cd "device pcm" 46.Cd "device usb" 47.Sh DESCRIPTION 48The 49.Nm 50driver provides support for 51.Tn USB 52audio class devices. 53.Pp 54A 55.Tn USB 56audio device consists of a number of components: 57input terminals (e.g. USB digital input), output terminals (e.g. 58speakers), and a number of units in between (e.g. volume control). 59.Pp 60Refer to the 61.Ql USB Audio Class Specification 62for more information. 63.Sh SEE ALSO 64.Xr pcm 4 , 65.Xr usb 4 66.Rs 67.%T "USB Audio Class Specifications" 68.%O http://www.usb.org/developers/devclass_docs/ 69.Re 70.Sh HISTORY 71The 72.Nm 73driver first appeared in 74appeared in 75.Fx 4.7 . 76.Sh AUTHORS 77This manual page was adopted from 78.Nx 1.6 79and modified for 80.Fx 81by 82.An Hiten Pandya Aq hmp@FreeBSD.org . 83.Sh BUGS 84The 85.Tn PCM 86framework in 87.Fx , 88as of this writing, does not handle device un-registrations in a properly 89abstracted manner, i.e. a detach request is refused by the 90.Tn PCM 91framework if the device is in use. 92For 93.Tn USB 94and supposedly other detach-able busses, it is necessary to allow the 95device un-registration to complete successfully, otherwise the driver 96leaves wild pointers to invalid data structures and thus leading to a panic. 97