NAME

aps - ThinkPad Active Protection System accelerometer

SYNOPSIS

aps0 at isa? port 0x1600

DESCRIPTION

The aps driver provides support for several sensors found in some ThinkPad laptops.

The sensors currently exposed via the envsys(4) interface are:

Sensor Units Typical Use
X_ACCEL Integer X Acceleration
Y_ACCEL Integer Y Acceleration
X_VAR Integer Weighted X Acceleration?
Y_VAR Integer Weighted Y Acceleration?
Temp1 uK Unknown
Temp2 uK Unknown
Keyboard Active Boolean Keyboard activity
Mouse Active Boolean Mouse activity
Lid Open Boolean Lid state

SEE ALSO

envsys(4), envstat(8)

HISTORY

The aps driver first appeared in OpenBSD3.8 and then was ported to NetBSD 5.0.

AUTHORS

The aps driver was written by Jonathan Gray <jsg@openbsd.org>
.

CAVEATS

The aps driver does not yet maintain state and subsequently does not take evasive action when it thinks the hard drive is in danger.

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.

As IBM provides no documentation, it is not known what all the available sensors are used for.