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 14, 2004 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 34.Cd "device sound" 35.Cd "device snd_maestro3" 36.Sh DESCRIPTION 37The 38.Nm 39driver provides support for the ESS Maestro3 and Allegro-1 sound chips 40under the PCM framework. 41These chips are mostly found in laptop computers and feature an AC97 mixer, 42a multi-channel sample rate converter that can mix up to four digital audio 43streams in hardware, recording support, and external volume control buttons. 44.Pp 45The firmware for the sound processor is licensed under the GNU Public 46License, and thus this driver is not included in the default 47.Pa GENERIC 48kernel. 49A convenient way to automatically load the driver is to add the line 50.Pp 51.Dl snd_maestro3_load="YES" 52.Pp 53to the file 54.Pa /boot/loader.conf . 55.Sh HARDWARE 56The 57.Nm 58driver supports the following audio devices: 59.Pp 60.Bl -bullet -compact 61.It 62ESS Technology Allegro-1 63.It 64ESS Technology Maestro3 65.El 66.Sh DIAGNOSTICS 67The hardware volume control buttons can be connected to two different pin 68sets (GPIO or GD) on the chip, depending on the manufacturer. 69The driver has no way of determining this configuration, so a hint may be 70used to override the default guess. 71The default setting for hardware volume control assumes that GD pins 72are wired to control the hardware volume. 73For systems that have the GPIO pins wired to the hardware volume control 74buttons, add the line 75.Dq Li hint.pcm.0.hwvol_config="0" 76to the file 77.Pa /boot/device.hints 78to override the default setting. 79.Sh SEE ALSO 80.Xr sound 4 , 81.Xr loader.conf 5 82.Sh HISTORY 83The 84.Nm 85driver first appeared in 86.Fx 4.3 . 87.Sh AUTHORS 88.An Scott Long Aq scottl@FreeBSD.org 89.An Darrel Anderson Aq anderson@cs.duke.edu 90