105 lines
3.0 KiB
Groff
105 lines
3.0 KiB
Groff
.\" Copyright (c) 2005 Joel Dahl
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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 November 29, 2006
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.Dt SND_VIA8233 4
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.Os
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.Sh NAME
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.Nm snd_via8233
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.Nd "VIA Technologies VT8233 bridge device driver"
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.Sh SYNOPSIS
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To compile this driver into the kernel, place the following lines in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device sound"
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.Cd "device snd_via8233"
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.Ed
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.Pp
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Alternatively, to load the driver as a module at boot time, place the
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following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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snd_via8233_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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bridge driver allows the generic audio driver,
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.Xr sound 4 ,
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to attach to the VIA VT8233 audio devices.
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These audio chipsets are integrated in the southbridge on many VIA based
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motherboards.
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.Ss Runtime Configuration
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The following
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.Xr sysctl 8
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variables are available in addition to those available to all
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.Xr sound 4
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devices:
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.Bl -tag -width ".Va dev.pcm.%d.polling" -offset indent
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.It Va dev.pcm.%d.polling
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Experimental polling mode, where the driver operates by querying the device
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state on each tick using
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.Xr callout 9 .
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Polling is disabled by default.
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Do not enable it unless you are facing weird interrupt problems or if the
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device cannot generate interrupts at all.
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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 chipsets:
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.Pp
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.Bl -bullet -compact
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.It
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VIA VT8233
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.It
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VIA VT8233A
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.It
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VIA VT8233C
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.It
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VIA VT8235
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.It
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VIA VT8237
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.It
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VIA VT8251
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.El
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.Sh SEE ALSO
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.Xr sound 4
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.Sh HISTORY
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The
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.Nm
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device driver first appeared in
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.Fx 4.7 .
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.Sh AUTHORS
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This manual page was written by
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.An Joel Dahl Aq joel@FreeBSD.org .
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.Sh BUGS
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The
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.Nm
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driver
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does not support S/PDIF.
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There is partial support in the code, so implementing it should be fairly
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easy if the right hardware is available.
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