131 lines
3.8 KiB
Groff
131 lines
3.8 KiB
Groff
.\" $NetBSD: swsensor.4,v 1.8 2011/06/07 07:27:31 wiz Exp $
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.\"
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.\" Copyright (c) 2010 The NetBSD Foundation
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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 June 4, 2011
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.Dt SWSENSOR 4
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.Os
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.Sh NAME
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.Nm swsensor
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.Nd software environmental sensor
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.Sh SYNOPSIS
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.Cd "pseudo-device swsensor"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides a software environmental sensor that works with
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.Xr sysctl 8
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and
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.Xr envstat 8 .
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The driver is intended to be loaded as a kernel module.
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One can, however, include the
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.Nm
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driver directly in a kernel using the configuration from the synopsis.
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By default, the sensor is of type
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.Dv ENVSYS_UNITS_INTEGER .
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.Pp
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The following integer values can be specified in the
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.Xr modload 8
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command when loading the
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.Nm
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module to alter the driver's behavior.
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.Pp
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.Bl -tag -width "variable"
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.It Sy "Variable" Sy "Usage"
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.It Li "mode"
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Controls whether or not
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.Nm
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provides internally-maintained limits and limit checking
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.Bl -tag -width "Value"
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.It Sy "Value" Sy "Meaning"
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.It Li "0"
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sensor has no internally-maintained limits
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.It Li "1"
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sensor provides its own internal limit value
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.It Li "2"
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sensor maintains an internal adjustable limit and performs its own
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comparison between the sensor's limit and its current value
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.El
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.It Li "limit"
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The initial limit value, if limit emulation is selected (ie, if
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.Dv mode
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is set to 1 or 2)
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.It Li "value_max"
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.It Li "value_min"
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The maximum and minimum values.
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The corresponding
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.Dv ENVSYS_FVALID_MAX
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and
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.Dv ENVSYS_FVALID_MIN
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flags are implicitly set.
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.It Li "percentage"
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This boolean value controls the setting of the
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.Dv ENVSYS_FPERCENT
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flag.
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.It Li "type"
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Override the sensor's unit/type.
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.It Li "value"
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Provide an initial value for the sensor.
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If this is omitted, the sensor's initial value is set to zero.
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.El
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.Pp
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For example,
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.Dl Ic modload -i type=1 swsensor
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will create a sensor of type
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.Dv ENVSYS_UNITS_SFANRPM ,
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while
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.Dl Ic modload -i mode=1 -i limit=50 swsensor
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will create a sensor which has an initial, device-provided limit of 50.
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.Pp
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The sensor's raw value can be manually updated by modifying the
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.Xr sysctl 8
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variable
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.Dq hw.swsensor.cur_value .
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.Sh SEE ALSO
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.Xr modctl 2 ,
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.Xr envstat 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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driver was written by
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.An Paul Goyette
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and first appeared in
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.Nx 6.0 .
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.Sh BUGS
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The
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.Nm
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driver emulates a device with only a single sensor.
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.Pp
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The
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.Nm
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driver can only emulate one hardware-managed limit; this is assumed to
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be the
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.Dv critical-min
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limit.
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