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+.\" $NetBSD: g760a.4,v 1.4 2024/09/07 19:13:27 rillig Exp $
+.\"
+.\" Copyright (c) 2008 A.Leo.
+.\" 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.
+.\" 3. All advertising materials mentioning features or use of this software
+.\" must display the following acknowledgement:
+.\" This product includes software developed for the
+.\" NetBSD Project. See https://www.NetBSD.org/ for
+.\" information about NetBSD.
+.\" 4. The name of the author may not be used to endorse or promote products
+.\" derived from this software without specific prior written permission.
+.\"
+.\" 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.
+.\"
+.Dd April 11, 2008
+.Dt G760A 4
+.Os
+.Sh NAME
+.Nm g760a
+.Nd Global Mixed-mode Technology Inc. G760a fan speed controller driver
+.Sh SYNOPSIS
+.Cd g760a0 at iic? addr 0x3e
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the
+.Tn Global Mixed-mode Technology Inc.
+G760a on iicbus fan speed controller to be used with the
+.Xr envsys 4
+API.
+This chip could be found in
+.Tn D-Link's DNS-323 NAS box.
+.Pp
+The following
+.Xr sysctl 8
+variable controls the fan's speed:
+.Bl -tag
+.It Dv machdep.g760a0.rpm
+This value specifies the desired speed for the fan.
+Valid range is 2000..20000 or 0 (the fan is turned off).
+The default value is 0.
+.Pp
+When setting the desired speed the RPM number will be converted
+to the internal representation and truncated.
+For example when you are setting 2000 it will be truncated to 2006,
+and 8000 will be changed to 8057.
+.El
+.Sh SEE ALSO
+.Xr envsys 4 ,
+.Xr lm 4 ,
+.Xr envstat 8
+.Sh AUTHORS
+The
+.Nm
+driver was written by
+.An A. Leo .