.\"	$OpenBSD: aps.4,v 1.9 2011/09/03 22:59:08 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 $Mdocdate: September 3 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 sysctl 8
interface are:
.Bl -column "Keyboard Active" "Unknown" "Typical Use" -offset indent
.It Sy "Sensor" Ta Sy "Units" Ta Sy "Typical Use"
.It Li "X_ACCEL" Ta "Unknown" Ta "X Acceleration"
.It Li "Y_ACCEL" Ta "Unknown" Ta "Y Acceleration"
.It Li "X_VAR" Ta "Unknown" Ta "Weighted X Acceleration?"
.It Li "Y_VAR" Ta "Unknown" Ta "Weighted Y Acceleration?"
.It Li "Temp1" Ta "uK" Ta "Unknown"
.It Li "Temp2" Ta "uK" Ta "Unknown"
.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 isa 4 ,
.Xr sensorsd 8 ,
.Xr sysctl 8
.Sh HISTORY
The
.Nm
driver first appeared in
.Ox 3.8 .
.Sh AUTHORS
The
.Nm
driver was written by
.An Jonathan Gray Aq jsg@openbsd.org .
.Sh CAVEATS
The
.Nm
driver does not yet maintain state and subsequently does not take
evasive action when it thinks the hard drive is in danger.
.Pp
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.
.Pp
As IBM provides no documentation, it is not known what all the available
sensors are used for.