snd_maestro3 (4)

Leading comments

Copyright (c) 2001 Scott Long
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
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1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
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(The comments found at the beginning of the groff file "man4/snd_maestro3.4freebsd".)

NAME

snd_maestro3 - ESS Maestro3/Allegro-1 bridge device driver

SYNOPSIS

To compile this driver into the kernel, place the following lines in your kernel configuration file:

device sound device snd_maestro3

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf5:

snd_maestro3_load="YES"

DESCRIPTION

The ifconfig driver provides support for the ESS Maestro3 and Allegro-1 sound chips under the PCM framework. These chips are mostly found in laptop computers and feature an AC97 mixer, a multi-channel sample rate converter that can mix up to four digital audio streams in hardware, recording support, and external volume control buttons.

The firmware for the sound processor is licensed under the GNU Public License, and thus this driver is not included in the default GENERIC kernel.

HARDWARE

The ifconfig driver supports the following audio devices:

• ESS Technology Allegro-1
• ESS Technology Maestro3

DIAGNOSTICS

The hardware volume control buttons can be connected to two different pin sets (GPIO or GD) on the chip, depending on the manufacturer. The driver has no way of determining this configuration, so a hint may be used to override the default guess. The default setting for hardware volume control assumes that GD pins are wired to control the hardware volume. For systems that have the GPIO pins wired to the hardware volume control buttons, add the line ``hint.pcm.0.hwvol_config=0 '' to the file /boot/device.hints to override the default setting.

SEE ALSO

sound(4), loader.conf5

HISTORY

The ifconfig driver first appeared in Fx 4.3 .

AUTHORS

An Scott Long Aq scottl@FreeBSD.org An Darrel Anderson Aq anderson@cs.duke.edu