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 0x1600Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
aps_load="YES"
DESCRIPTION
Theaps 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) interface, 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 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.