90 lines
3.1 KiB
Groff
90 lines
3.1 KiB
Groff
.\" Copyright (c) 2001 Scott Long
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd December 14, 2004
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.Dt SND_MAESTRO3 4
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.Os
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.Sh NAME
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.Nm snd_maestro3
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.Nd "ESS Maestro3/Allegro-1 bridge device driver"
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.Sh SYNOPSIS
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.Cd "device sound"
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.Cd "device snd_maestro3"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for the ESS Maestro3 and Allegro-1 sound chips
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under the PCM framework.
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These chips are mostly found in laptop computers and feature an AC97 mixer,
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a multi-channel sample rate converter that can mix up to four digital audio
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streams in hardware, recording support, and external volume control buttons.
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.Pp
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The firmware for the sound processor is licensed under the GNU Public
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License, and thus this driver is not included in the default
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.Pa GENERIC
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kernel.
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A convenient way to automatically load the driver is to add the line
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.Pp
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.Dl snd_maestro3_load="YES"
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.Pp
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to the file
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.Pa /boot/loader.conf .
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.Sh HARDWARE
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The
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.Nm
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driver supports the following audio devices:
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.Pp
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.Bl -bullet -compact
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.It
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ESS Technology Allegro-1
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.It
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ESS Technology Maestro3
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.El
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.Sh DIAGNOSTICS
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The hardware volume control buttons can be connected to two different pin
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sets (GPIO or GD) on the chip, depending on the manufacturer.
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The driver has no way of determining this configuration, so a hint may be
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used to override the default guess.
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The default setting for hardware volume control assumes that GD pins
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are wired to control the hardware volume.
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For systems that have the GPIO pins wired to the hardware volume control
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buttons, add the line
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.Dq Li hint.pcm.0.hwvol_config="0"
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to the file
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.Pa /boot/device.hints
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to override the default setting.
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.Sh SEE ALSO
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.Xr sound 4 ,
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.Xr loader.conf 5
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Fx 4.3 .
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.Sh AUTHORS
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.An Scott Long Aq scottl@FreeBSD.org
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.An Darrel Anderson Aq anderson@cs.duke.edu
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