1.\" Copyright (c) 2005 Joel Dahl 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: src/share/man/man4/snd_via8233.4,v 1.6 2006/11/29 17:07:02 joel Exp $ 26.\" $DragonFly: src/share/man/man4/snd_via8233.4,v 1.1 2007/01/04 21:47:00 corecode Exp $ 27.\" 28.Dd November 29, 2006 29.Dt SND_VIA8233 4 30.Os 31.Sh NAME 32.Nm snd_via8233 33.Nd "VIA Technologies VT8233 bridge device driver" 34.Sh SYNOPSIS 35To compile this driver into the kernel, place the following lines in your 36kernel configuration file: 37.Bd -ragged -offset indent 38.Cd "device pcm" 39.Cd "device snd_via8233" 40.Ed 41.Pp 42Alternatively, to load the driver as a module at boot time, place the 43following line in 44.Xr loader.conf 5 : 45.Bd -literal -offset indent 46snd_via8233_load="YES" 47.Ed 48.Sh DESCRIPTION 49The 50.Nm 51bridge driver allows the generic audio driver, 52.Xr sound 4 , 53to attach to the VIA VT8233 audio devices. 54These audio chipsets are integrated in the southbridge on many VIA based 55motherboards. 56.Ss Runtime Configuration 57The following 58.Xr sysctl 8 59variables are available in addition to those available to all 60.Xr sound 4 61devices: 62.Bl -tag -width ".Va dev.pcm.%d.polling" -offset indent 63.It Va dev.pcm.%d.polling 64Experimental polling mode, where the driver operates by querying the device 65state on each tick using 66.Xr callout 9 . 67Polling is disabled by default. 68Do not enable it unless you are facing weird interrupt problems or if the 69device cannot generate interrupts at all. 70.Sh HARDWARE 71The 72.Nm 73driver supports the following audio chipsets: 74.Pp 75.Bl -bullet -compact 76.It 77VIA VT8233 78.It 79VIA VT8233A 80.It 81VIA VT8233C 82.It 83VIA VT8235 84.It 85VIA VT8237 86.It 87VIA VT8251 88.El 89.Sh SEE ALSO 90.Xr sound 4 91.Sh HISTORY 92The 93.Nm 94device driver first appeared in 95.Fx 4.7 . 96.Sh AUTHORS 97This manual page was written by 98.An Joel Dahl Aq joel@FreeBSD.org . 99.Sh BUGS 100The 101.Nm 102driver 103does not support S/PDIF. 104There is partial support in the code, so implementing it should be fairly 105easy if the right hardware is available. 106