1.\" Copyright (c) 2001 Scott Long 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 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. 12.\" 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 23.\" SUCH DAMAGE. 24.\" 25.Dd December 15, 2005 26.Dt SND_MAESTRO3 4 27.Os 28.Sh NAME 29.Nm snd_maestro3 30.Nd "ESS Maestro3/Allegro-1 bridge device driver" 31.Sh SYNOPSIS 32To compile this driver into the kernel, place the following lines in your 33kernel configuration file: 34.Bd -ragged -offset indent 35.Cd "device sound" 36.Cd "device snd_maestro3" 37.Ed 38.Pp 39Alternatively, to load the driver as a module at boot time, place the 40following line in 41.Xr loader.conf 5 : 42.Bd -literal -offset indent 43snd_maestro3_load="YES" 44.Ed 45.Sh DESCRIPTION 46The 47.Nm 48driver provides support for the ESS Maestro3 and Allegro-1 sound chips 49under the PCM framework. 50These chips are mostly found in laptop computers and feature an AC97 mixer, 51a multi-channel sample rate converter that can mix up to four digital audio 52streams in hardware, recording support, and external volume control buttons. 53.Pp 54The firmware for the sound processor is licensed under the GNU Public 55License, and thus this driver is not included in the default 56.Pa GENERIC 57kernel. 58.Sh HARDWARE 59The 60.Nm 61driver supports the following audio devices: 62.Pp 63.Bl -bullet -compact 64.It 65ESS Technology Allegro-1 66.It 67ESS Technology Maestro3 68.El 69.Sh DIAGNOSTICS 70The hardware volume control buttons can be connected to two different pin 71sets (GPIO or GD) on the chip, depending on the manufacturer. 72The driver has no way of determining this configuration, so a hint may be 73used to override the default guess. 74The default setting for hardware volume control assumes that GD pins 75are wired to control the hardware volume. 76For systems that have the GPIO pins wired to the hardware volume control 77buttons, add the line 78.Dq Li hint.pcm.0.hwvol_config="0" 79to the file 80.Pa /boot/device.hints 81to override the default setting. 82.Sh SEE ALSO 83.Xr sound 4 , 84.Xr loader.conf 5 85.Sh HISTORY 86The 87.Nm 88driver first appeared in 89.Fx 4.3 . 90.Sh AUTHORS 91.An Scott Long Aq Mt scottl@FreeBSD.org 92.An Darrel Anderson Aq Mt anderson@cs.duke.edu 93