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+.\"	$NetBSD: tda.4,v 1.3 2013/03/14 19:18:32 njoly Exp $
+.\"
+.\" Copyright (c) 2013 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Julian Coleman
+.\"
+.\" 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``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 FOUNDATION OR CONTRIBUTORS
+.\" 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.
+.\"
+.Dd February 2, 2013
+.Dt TDA 4 sparc64
+.Os
+.Sh NAME
+.Nm tda
+.Nd TDA8444 fan speed controller
+.Sh SYNOPSIS
+.Cd "tda0 at iic1 addr 0x24: fan-control"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the TDA8444 DAC used to control the fan speeds
+in Sun Blade 1000 and Blade 2000 systems.
+The speed of the CPU fan and of the system fan are automatically adjusted
+every 60 seconds, based on the currently reported CPU and system
+temperatures, respectively.
+.Pp
+The speed-related values are made available through the
+.Xr envstat 8
+interface.
+The range of the values are:
+.Bl -column -offset indent ".Sy System temperature" ".Sy Minimum" ".Sy Maximum"
+.It Sy Ta Sy Minimum Ta Sy Maximum
+.It Li CPU temperature Ta <=57 Ta >=67
+.It Li System temperature Ta <=20 Ta >=30
+.It Li Speed value Ta 12 Ta 63
+.El
+.Sh SEE ALSO
+.Xr admtemp 4 ,
+.Xr envstat 8
+.Sh BUGS
+The temperatures are reported as
+.Sq internal
+and
+.Sq external
+instead of
+.Sq system
+and
+.Sq CPU ,
+respectively.