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APS(4)                DragonFly Kernel Interfaces Manual                APS(4)


NAME

     aps -- ThinkPad Active Protection System accelerometer


SYNOPSIS

     To compile this driver into the kernel, place the following lines in your
     kernel configuration file:

           device isa
           device aps0 at isa? port 0x1600

     Alternatively, to load the driver as a module at boot time, place the
     following line in loader.conf(5):

           aps_load="YES"


DESCRIPTION

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

     The sensors currently supported 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

     Sensor values are made available through the HW_SENSORS sysctl(3) inter-
     face, and can be monitored with the systat(1) sensors display,
     sensorsd(8) and sysctl(8) hw.sensors.  For example, on a ThinkPad R51:

           %sysctl hw.sensors.aps0
           hw.sensors.aps0.raw0: 488 (X_ACCEL)
           hw.sensors.aps0.raw1: 481 (Y_ACCEL)
           hw.sensors.aps0.raw2: 488 (X_VAR)
           hw.sensors.aps0.raw3: 481 (Y_VAR)
           hw.sensors.aps0.temp0: 52.00 degC
           hw.sensors.aps0.temp1: 52.00 degC
           hw.sensors.aps0.indicator0: Off (Keyboard Active)
           hw.sensors.aps0.indicator1: Off (Mouse Active)
           hw.sensors.aps0.indicator2: On (Lid Open)


SEE ALSO

     systat(1), sysctl(3), intro(4), isa(4), sensorsd(8), sysctl(8)


HISTORY

     The aps driver first appeared in OpenBSD 3.8.  DragonFly support was
     added in DragonFly 2.5.


AUTHORS

     The aps driver was written by Jonathan Gray <jsg@openbsd.org>.  It was
     adapted to DragonFly by Constantine A. Murenin, University of Waterloo.


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.

DragonFly 3.5                   March 18, 2010                   DragonFly 3.5

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