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.\"
| 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.\"
|
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
| 49.Sh DESCRIPTION
50The
51.Nm
52driver provides support for
53.Tn USB
54audio class devices.
55.Pp
56A
57.Tn USB
58audio device consists of a number of components:
59input terminals (e.g.\& USB digital input), output terminals (e.g.\&
60speakers), and a number of units in between (e.g.\& volume control).
61.Pp
62Refer to the
63.Ql USB Audio Class Specification
64for more information.
65.Sh SEE ALSO
|
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
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.
| 67.Xr usb 4
68.Rs
69.%T "USB Audio Class Specifications"
70.%O http://www.usb.org/developers/devclass_docs/
71.Re
72.Sh HISTORY
73The
74.Nm
75driver first appeared 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.
|