2007-09-12 02:27:04 +04:00
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.\" $NetBSD: aps.4,v 1.2 2007/09/11 22:27:04 wiz Exp $
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2007-09-12 01:46:52 +04:00
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.\" $OpenBSD: aps.4,v 1.7 2007/05/31 19:19:49 jmc Exp $
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.\"
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.\" Copyright (c) 2005 Jonathan Gray <jsg@openbsd.org>
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.Dd September 11, 2007
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.Dt APS 4
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.Os
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.Sh NAME
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.Nm aps
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.Nd ThinkPad Active Protection System accelerometer
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.Sh SYNOPSIS
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.Cd "aps0 at isa? port 0x1600"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for several sensors found in some ThinkPad laptops.
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.Pp
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The sensors currently exposed via the
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.Xr envsys 4
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interface are:
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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 "X_ACCEL" Ta "Integer" Ta "X Acceleration"
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.It Li "Y_ACCEL" Ta "Integer" Ta "Y Acceleration"
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.It Li "X_VAR" Ta "Integer" Ta "Weighted X Acceleration?"
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.It Li "Y_VAR" Ta "Integer" Ta "Weighted Y Acceleration?"
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.It Li "Temp1" Ta "uK" Ta "Unknown"
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.It Li "Temp2" Ta "uK" Ta "Unknown"
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.It Li "Keyboard Active" Ta "Boolean" Ta "Keyboard activity"
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.It Li "Mouse Active" Ta "Boolean" Ta "Mouse activity"
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.It Li "Lid Open" Ta "Boolean" Ta "Lid state"
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.El
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.Sh SEE ALSO
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2007-09-12 02:27:04 +04:00
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.Xr envsys 4 ,
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.Xr envstat 8
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2007-09-12 01:46:52 +04:00
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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2007-09-12 02:27:04 +04:00
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.Ox 3.8
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2007-09-12 01:46:52 +04:00
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and then was ported to
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.Nx
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5.0.
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.Sh AUTHORS
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The
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.Nm
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driver was written by
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.An Jonathan Gray Aq jsg@openbsd.org .
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.Sh CAVEATS
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The
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.Nm
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driver does not yet maintain state and subsequently does not take
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evasive action when it thinks the hard drive is in danger.
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.Pp
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The Y axis on X40 and possibly other models seems to be inverted.
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It is unknown how to distinguish between different versions of the
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accelerometer to compensate for this in the driver at this time.
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.Pp
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As IBM provides no documentation, it is not known what all the available
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sensors are used for.
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