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+.\"-
+.\" Copyright (c) 2009 Nathan Whitehorn <nwhitehorn@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 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
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+.\" DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+.\" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+.\" ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd January 20, 2009
+.Dt SND_AI2S 4
+.Os
+.Sh NAME
+.Nm snd_ai2s
+.Nd "Apple I2S audio device driver"
+.Sh SYNOPSIS
+To compile this driver into the kernel,
+place the following lines in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device sound"
+.Cd "device snd_ai2s"
+.Ed
+.Pp
+Alternatively, to load the driver as a
+module at boot time, place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+snd_ai2s_load="YES"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the Apple I2S audio controllers found
+predominantly in G4 and G5 machines, along with the snapper and tumbler
+codecs. Some machines (e.g. the Mac Mini) do not have configurable
+codecs and so lack hardware volume control.
+.Sh HARDWARE
+Chips supported by the
+.Nm
+driver include:
+.Pp
+.Bl -bullet -compact
+.It
+Apple Tumbler Audio
+.It
+Apple Snapper Audio
+.El
+.Sh SEE ALSO
+.Xr sound 4 ,
+.Xr snd_davbus 4
+.Sh HISTORY
+The
+.Nm
+device driver appeared in
+.Nx 2.0
+and then in
+.Fx 8.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Tsubai Masanari
+.Aq tsubai@netbsd.org ,
+and ported to FreeBSD by
+.An Marco Trillo
+.Aq marcotrillo@gmail.com .
+.Sh BUGS
+Recording and operation with non-44.1 Khz audio are not currently supported.