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