APS(4)

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 OpenBSD 3.8 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.