APS(4) - Device Drivers Manual #

APS(4) - Device Drivers Manual

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 sysctl(8) interface are:

**Sensor**         **Units**  **Typical Use**  
`X_ACCEL`          Unknown    X Acceleration  
`Y_ACCEL`          Unknown    Y Acceleration  
`X_VAR`            Unknown    Weighted X Acceleration?  
`Y_VAR`            Unknown    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 #

isa(4), sensorsd(8), sysctl(8)

HISTORY #

The aps driver first appeared in OpenBSD 3.8.

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.

OpenBSD 7.5 - July 16, 2013