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.\" $FreeBSD$ 26.\" 27.Dd December 15, 2005 28.Dt SND_MAESTRO3 4 29.Os 30.Sh NAME 31.Nm snd_maestro3 32.Nd "ESS Maestro3/Allegro-1 bridge device driver" 33.Sh SYNOPSIS 34To compile this driver into the kernel, place the following lines in your 35kernel configuration file: 36.Bd -ragged -offset indent 37.Cd "device sound" 38.Cd "device snd_maestro3" 39.Ed 40.Pp 41Alternatively, to load the driver as a module at boot time, place the 42following line in 43.Xr loader.conf 5 : 44.Bd -literal -offset indent 45snd_maestro3_load="YES" 46.Ed 47.Sh DESCRIPTION 48The 49.Nm 50driver provides support for the ESS Maestro3 and Allegro-1 sound chips 51under the PCM framework. 52These chips are mostly found in laptop computers and feature an AC97 mixer, 53a multi-channel sample rate converter that can mix up to four digital audio 54streams in hardware, recording support, and external volume control buttons. 55.Pp 56The firmware for the sound processor is licensed under the GNU Public 57License, and thus this driver is not included in the default 58.Pa GENERIC 59kernel. 60.Sh HARDWARE 61The 62.Nm 63driver supports the following audio devices: 64.Pp 65.Bl -bullet -compact 66.It 67ESS Technology Allegro-1 68.It 69ESS Technology Maestro3 70.El 71.Sh DIAGNOSTICS 72The hardware volume control buttons can be connected to two different pin 73sets (GPIO or GD) on the chip, depending on the manufacturer. 74The driver has no way of determining this configuration, so a hint may be 75used to override the default guess. 76The default setting for hardware volume control assumes that GD pins 77are wired to control the hardware volume. 78For systems that have the GPIO pins wired to the hardware volume control 79buttons, add the line 80.Dq Li hint.pcm.0.hwvol_config="0" 81to the file 82.Pa /boot/device.hints 83to override the default setting. 84.Sh SEE ALSO 85.Xr sound 4 , 86.Xr loader.conf 5 87.Sh HISTORY 88The 89.Nm 90driver first appeared in 91.Fx 4.3 . 92.Sh AUTHORS 93.An Scott Long Aq scottl@FreeBSD.org 94.An Darrel Anderson Aq anderson@cs.duke.edu 95