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+.\"	$NetBSD: aps.4,v 1.8 2014/03/18 18:20:39 riastradh Exp $
+.\"	$OpenBSD: aps.4,v 1.7 2007/05/31 19:19:49 jmc Exp $
+.\"
+.\" Copyright (c) 2005 Jonathan Gray <jsg@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd July 13, 2011
+.Dt APS 4
+.Os
+.Sh NAME
+.Nm aps
+.Nd ThinkPad Active Protection System accelerometer
+.Sh SYNOPSIS
+.Cd "aps0 at isa? port 0x1600"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for several sensors found in some ThinkPad laptops.
+.Pp
+The sensors currently exposed via the
+.Xr envsys 4
+interface are:
+.Bl -column "Sensor        " "Units    " "Typical" -offset indent
+.It Sy "Sensor        " Ta Sy "Units    " Ta Sy "Typical Use"
+.It Li "x-acceleration" Ta "integer" Ta "X-axis acceleration"
+.It Li "y-acceleration" Ta "integer" Ta "Y-axis acceleration"
+.It Li "x-variable" Ta "integer" Ta "Weighted X acceleration?"
+.It Li "y-variable" Ta "integer" Ta "Weighted Y acceleration?"
+.It Li "temperature 1" Ta "degC" Ta "Unknown temperature"
+.It Li "temperature 2" Ta "degC" Ta "Unknown temperature"
+.It Li "keyboard active" Ta "boolean" Ta "Keyboard activity"
+.It Li "mouse active" Ta "boolean" Ta "Mouse activity"
+.It Li "lid open" Ta "boolean" Ta "Lid state"
+.El
+.Sh SEE ALSO
+.Xr envsys 4 ,
+.Xr hpacel 4 ,
+.Xr thinkpad 4 ,
+.Xr envstat 8
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Ox 3.8
+and was then ported to
+.Nx
+5.0.
+.Sh AUTHORS
+The
+.Nm
+driver was written by
+.An Jonathan Gray Aq Mt jsg@openbsd.org .
+.Sh CAVEATS
+Few issues can be mentioned.
+.Bl -bullet
+.It
+The
+.Nm
+driver does not maintain state and subsequently does not take
+evasive action when it thinks the hard drive is in danger.
+Possible actions would include spinning down the hard drive
+in case excessive tremor is detected by the sensors.
+.It
+The Y axis on X40 and possibly other models seems to be inverted.
+It is unknown how to distinguish between different versions of the
+accelerometer to compensate for this in the driver at this time.
+.It
+The sensor values are refreshed every 0.5 seconds.
+Because no protection measures are taken,
+this is unnecessary and may have a negative effect on battery life.
+.It
+As IBM provides no documentation, it is not known what all the available
+sensors are used for.
+.El