265 lines
8.2 KiB
Groff
265 lines
8.2 KiB
Groff
.\" $NetBSD: dbcool.4,v 1.10 2011/03/12 13:24:15 wiz Exp $
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.\"
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.\" Copyright (c) 2008 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 Paul Goyette.
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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 March 12, 2011
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.Dt DBCOOL 4
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.Os
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.Sh NAME
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.Nm dbcool ,
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.Nm adm1027 ,
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.Nm adm1030 ,
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.Nm adm1031 ,
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.Nm adt7463 ,
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.Nm adt7466 ,
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.Nm adt7467 ,
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.Nm adt7468 ,
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.Nm adt7473 ,
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.Nm adt7475 ,
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.Nm adt7476 ,
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.Nm adt7490 ,
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.Nm emc6d103s
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.Nd dbCool(tm) family of environmental monitors and fan controllers
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.Sh SYNOPSIS
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.Cd "dbcool* at ki2c?"
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.Cd "dbcool* at iic? addr 0x2e"
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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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dbCool and the
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.Tn SMSC
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EMC6D103S environmental 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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These chips support up to fifteen sensors.
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Not all of the following sensors are supported on all chips.
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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 "l_temp" Ta "uK" Ta "local chip temperature"
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.It Li "r1_temp" Ta "uK" Ta "CPU temperature"
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.It Li "r2_temp" Ta "uK" Ta "GPU temperature"
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.It Li "Vccp" Ta "uV DC" Ta "CPU Vcore"
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.It Li "Vcc" Ta "uV DC" Ta "Chip's supply voltage"
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.It Li "2.5V" Ta "uV DC" Ta "2.5V supply"
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.It Li "5V" Ta "uV DC" Ta "5V supply"
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.It Li "12V" Ta "uV DC" Ta "12V supply"
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.It Li "Vtt" Ta "uV DC" Ta "PECI ref. voltage (2.25V ref, ADT7490 only)"
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.It Li "Imon" Ta "uV DC" Ta "Current monitor (2.25V ref, ADT7490 only)"
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.It Li "AIN1" Ta "uV DC" Ta "Analog In (2.25V ref, ADT7466 only)"
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.It Li "AIN2" Ta "uV DC" Ta "Analog In (2.25V ref, ADT7466 only)"
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.It Li "fan1" Ta "RPM" Ta "Chassis Fan"
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.It Li "fan2" Ta "RPM" Ta "Chassis Fan"
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.It Li "fan3" Ta "RPM" Ta "Chassis Fan"
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.It Li "fan4" Ta "RPM" Ta "Chassis Fan"
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.It Li "VID" Ta "(none)" Ta "CPU VID code (selected chips only)"
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.El
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.Pp
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Each temperature and voltage sensor has programmable hardware
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high- and low-limits; fan sensors have only a low-limit.
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These limits can be set using the
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.Xr envstat 8
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utility.
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Due to hardware limitations, the minimum permissible value for the fan
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speed low-limits is 83 RPM.
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.Pp
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Temperature sensors also have
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.Em Tmin ,
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.Em Trange ,
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.Em Thyst ,
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and
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.Em Ttherm
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.Xr sysctl 8
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variables; these values are used by the fan speed controllers.
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Their values are in units of degC, since this is the unit which is
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programmed into the device registers.
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.Pp
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All members of the dbCool family support Pulse-Width Modulated (PWM)
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fan speed control based on temperature thresholds - the fan will spin up
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when its associated thermal sensor(s) exceeds its configured
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.Em Tmin
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value.
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The fan will go faster as the temperature rises, and will slow down
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as the temperature falls.
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If the temperature exceeds the sensor's
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.Em Ttherm
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value, the THERM signal will be asserted, and if enabled the fan will
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run at full speed.
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The fan will be turned off when the sensor(s) that triggered it
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reports a temperature which is at least
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.Em Thyst
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degrees below its
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.Em Tmin
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threshold.
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.Pp
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Each fan controller is programmable using the following
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.Xr sysctl 8
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variables.
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.Bd -literal -offset indent
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hw.dbcool0.fan_ctl_0.behavior
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hw.dbcool0.fan_ctl_0.min_duty
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hw.dbcool0.fan_ctl_0.max_duty
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hw.dbcool0.fan_ctl_0.cur_duty
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.Ed
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.Pp
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The
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.Em behavior
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variable controls the selection of temperature sensors associated with
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the fan controller.
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When the associated temperature sensor reaches its
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.Em Tmin
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value, the fan controller starts the fan at its minimum duty cycle;
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when the associated temperature sensor reaches its
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.Em Ttherm
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value and asserts the THERM signal (or if an external THERM signal is
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asserted), the fan controller sets the fan speed to a 100% duty cycle.
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Between these two settings, each temperature sensor is used to calculate
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a duty cycle linearly based on the slope defined by the temperature sensor's
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.Em range
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variable.
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When the associated temperature falls at least
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.Em Thyst
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degress below its
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.Em Tmin
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value, the fan controller will turn off the fan.
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(On the ADM1030, the
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value for
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.Em Thyst
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is fixed at 5 degC.)
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.Pp
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Valid values for the
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.Em behavior
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variable are:
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.Bd -literal -offset indent
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local (not available on ADM1030)
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remote1
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remote2 (not available on ADM1030)
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local+remote2 (not available on ADM1030)
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all-temps
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full-speed (not available on ADM1030)
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manual
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disabled
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.Ed
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.Pp
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When the
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.Em behavior
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variable is set to
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.Dq manual ,
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the
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.Em cur-duty
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variable becomes user-writable and can be set to any value between 0 and
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100 inclusive to control the fan's duty cycle manually.
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In all other
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.Em behavior
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modes, the
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.Em cur-duty
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variable is read-only and updates are ignored.
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.Pp
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The
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.Em min-duty
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and
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.Em max-duty
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variables define the range over which the fan controller will manage the
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fan's duty cycle.
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On the ADM1030, these values are not separately controllable.
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The
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.Em max-duty
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is fixed at 100%, and the
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.Em cur-duty
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variable is used to specify the minimum duty cycle when the fan
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controller is running in automatic mode.
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.Pp
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Note that the duty-cycle value does not directly correspond to the fan's
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speed.
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That is, a 33% duty cycle does not mean that the fan runs at 33%
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of its maximum speed; in actuality, a 33% duty cycle drives the
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fan at a speed close to 50% of its maximum.
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Fan speed correlates approximately to the square root of the duty
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cycle.
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.Sh EXAMPLES
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The
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.Xr envstat 8
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utility can be used to determine the sensors supported:
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.Bd -literal -offset indent
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Current CritMax WarnMax WarnMin CritMin Unit
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l_temp: 44.250 degC
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r1_temp: 41.250 degC
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r2_temp: N/A
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Vccp: 0.002 V
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Vcc: 3.351 V
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fan1: N/A
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fan2: N/A
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fan3: N/A
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fan4: N/A
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.Ed
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.Pp
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Using this information, the following commands in
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.Pa /etc/envsys.conf
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will set appropriate limits for CPU temperature and chip supply
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voltage, and powerd will be notified if the limits are exceeded:
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.Bd -literal -offset indent
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dbcool0 {
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sensor1 {
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warning-max = 60C;
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critical-max = 65C;
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}
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sensor4 {
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critical-min = 3.1;
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warning-min = 3.2;
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critical-max = 3.5;
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}
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}
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.Ed
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.Sh SEE ALSO
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.Xr envsys 4 ,
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.Xr iic 4 ,
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.Xr envstat 8 ,
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.Xr powerd 8 ,
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.Xr sysctl 8
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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 5.0 .
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.Sh BUGS
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Although the sensor limit registers can be programmed, there is currently
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no use of the dbCool chips' ability to generate an SMBus interrupt when the
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limits are exceeded.
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Limit checking and event generation are done in software, and are performed
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only when the sensor values are polled and refreshed.
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.Pp
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The ADT7466 chip, although officially a member of the dbCool family, is
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programmed quite differently.
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The fan controllers on this chip are not currently implemented.
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.Pp
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The PECI (Processor Environment Control Interface) temperature sensors
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and the associated PWM behavior modes on the ADT7490 are not currently
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supported.
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