99 lines
3.7 KiB
Groff
99 lines
3.7 KiB
Groff
.\" $NetBSD: adt7467c.4,v 1.2 2008/04/30 13:10:53 martin Exp $
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.\"
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.\" Copyright (c) 2005 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Michael Lorenz.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd September 11, 2005
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.Dt ADT7467C 4
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.Os
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.Sh NAME
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.Nm adt7467c
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.Nd Analog Devices ADT7467 and ADM1030 hardware monitors and fan controllers
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.Sh SYNOPSIS
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.Cd "adt7467c0 at ki2c?"
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.\" .Cd "adm1030c at ki2c?"
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.\" .Cd "adt7467c at iic? addr 0x5c"
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.\" .Cd "adm1030c at iic? addr 0x58"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for the
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.Tn Analog Devices
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ADT7467 and ADM1030 hardware monitor chips to be used with the
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.Xr envsys 4
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API.
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.Pp
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The ADT7467 supports five sensors:
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.Bl -column "Sensor" "Units" "Typical" -offset indent
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.It Sy "Sensor" Ta Sy "Units" Ta Sy "Typical Use"
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.It Li "temp0" Ta "uK" Ta "chip temperature"
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.It Li "temp1" Ta "uK" Ta "CPU temperature"
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.It Li "temp2" Ta "uK" Ta "GPU temperature"
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.It Li "voltage0" Ta "uV DC" Ta "CPU Vcore"
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.It Li "fan0" Ta "RPM" Ta "Chassis Fan"
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.El
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.Pp
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The ADM1030 supports three sensors:
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.Bl -column "Sensor" "Units" "Typical" -offset indent
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.It Sy "Sensor" Ta Sy "Units" Ta Sy "Typical Use"
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.It Li "temp0" Ta "uK" Ta "chip temperature"
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.It Li "temp1" Ta "uK" Ta "CPU temperature"
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.It Li "fan0" Ta "RPM" Ta "Chassis Fan"
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.El
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.Pp
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Due to hardware limitations, fresh sensor data is only available
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every 2 seconds.
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.Pp
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Both controllers support fan speed control based on temperature
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thresholds - the fan will spin up when any thermal sensor reaches
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its configured threshold, it will go faster with higher temperature
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and slow down when temperature sinks.
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The fan will be turned off when the sensor(s) that triggered it
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report a temperature about 5C below threshold.
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All thresholds are configurable via sysctl:
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.Bd -literal -offset indent
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machdep.adt7467c0.temp0 = 56
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machdep.adt7467c0.temp1 = 85
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machdep.adt7467c0.temp2 = 76
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.Ed
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.Pp
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Every threshold corresponds to a temperature sensor, so with the
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ADM1030 there will be only two of them.
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Both chips use degree Celsius to specify temperature thresholds so
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that's what the sysctl interface uses too.
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Configuring a threshold below room temperature will essentially
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turn on the fan permanently, values above 85C will be rejected.
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.Sh HISTORY
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The
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.Nm
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device appeared in
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.Nx 4.0 .
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.Sh BUGS
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The drivers have been tested with iBooks only so far.
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The ADT7467 supports more fan speed sensors but these are unused
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in iBooks.
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