1 .\" Copyright (c) 2001 Scott Long
2 .\" All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that the following conditions
7 .\" 1. Redistributions of source code must retain the above copyright
8 .\" notice, this list of conditions and the following disclaimer.
9 .\" 2. Redistributions in binary form must reproduce the above copyright
10 .\" notice, this list of conditions and the following disclaimer in the
11 .\" documentation and/or other materials provided with the distribution.
13 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 .\" $FreeBSD: src/share/man/man4/snd_maestro3.4,v 1.7.2.2 2006/01/10 08:25:15 joel Exp $
26 .\" $DragonFly: src/share/man/man4/snd_maestro3.4,v 1.2 2007/06/16 17:44:33 hasso Exp $
33 .Nd "ESS Maestro3/Allegro-1 bridge device driver"
35 To compile this driver into the kernel, place the following lines in your
36 kernel configuration file:
37 .Bd -ragged -offset indent
39 .Cd "device snd_maestro3"
42 Alternatively, to load the driver as a module at boot time, place the
45 .Bd -literal -offset indent
46 snd_maestro3_load="YES"
51 driver provides support for the ESS Maestro3 and Allegro-1 sound chips
52 under the PCM framework.
53 These chips are mostly found in laptop computers and feature an AC97 mixer,
54 a multi-channel sample rate converter that can mix up to four digital audio
55 streams in hardware, recording support, and external volume control buttons.
57 The firmware for the sound processor is licensed under the GNU Public
58 License, and thus this driver is not included in the default
64 driver supports the following audio devices:
68 ESS Technology Allegro-1
70 ESS Technology Maestro3
73 The hardware volume control buttons can be connected to two different pin
74 sets (GPIO or GD) on the chip, depending on the manufacturer.
75 The driver has no way of determining this configuration, so a hint may be
76 used to override the default guess.
77 The default setting for hardware volume control assumes that GD pins
78 are wired to control the hardware volume.
85 driver first appeared in
88 .An Scott Long Aq scottl@FreeBSD.org
89 .An Darrel Anderson Aq anderson@cs.duke.edu