1.\" $NetBSD: uaudio.4,v 1.15 2002/02/12 19:53:57 jdolecek Exp $ 2.\" 3.\" Copyright (c) 1999 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Lennart Augustsson. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. All advertising materials mentioning features or use of this software 18.\" must display the following acknowledgement: 19.\" This product includes software developed by the NetBSD 20.\" Foundation, Inc. and its contributors. 21.\" 4. Neither the name of The NetBSD Foundation nor the names of its 22.\" contributors may be used to endorse or promote products derived 23.\" from this software without specific prior written permission. 24.\" 25.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35.\" POSSIBILITY OF SUCH DAMAGE. 36.\" 37.\" $FreeBSD$ 38.\" 39.Dd November 10, 2003 40.Dt UAUDIO 4 41.Os 42.Sh NAME 43.Nm uaudio 44.Nd USB audio device driver 45.Sh SYNOPSIS 46.Cd "device pcm" 47.Cd "device usb" 48.Sh DESCRIPTION 49The 50.Nm 51driver provides support for 52.Tn USB 53audio class devices. 54.Pp 55A 56.Tn USB 57audio device consists of a number of components: 58input terminals (e.g.\& USB digital input), output terminals (e.g.\& 59speakers), and a number of units in between (e.g.\& volume control). 60.Pp 61Refer to the 62.Ql USB Audio Class Specification 63for more information. 64.Sh SEE ALSO 65.Xr pcm 4 , 66.Xr usb 4 67.Rs 68.%T "USB Audio Class Specifications" 69.%O http://www.usb.org/developers/devclass_docs/ 70.Re 71.Sh HISTORY 72The 73.Nm 74driver first appeared in 75appeared in 76.Fx 4.7 . 77.Sh AUTHORS 78This manual page was adopted from 79.Nx 1.6 80and modified for 81.Fx 82by 83.An Hiten Pandya Aq hmp@FreeBSD.org . 84.Sh BUGS 85The 86.Tn PCM 87framework in 88.Fx , 89as of this writing, does not handle device un-registrations in a properly 90abstracted manner, i.e., a detach request is refused by the 91.Tn PCM 92framework if the device is in use. 93For 94.Tn USB 95and supposedly other detach-able busses, it is necessary to allow the 96device un-registration to complete successfully, otherwise the driver 97leaves wild pointers to invalid data structures and thus leading to a panic. 98