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APS(4)                   BSD Kernel Interfaces Manual                   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 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 accelerome-
     ter 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.

BSD                              May 25, 2017                              BSD