The ThinkPad Airbag Protection System (APS)

Given the level of interest generated by the PowerBook motion sensor experiments ([1], [2]), this should be of interest to many: Mark Smith has published a document titled The ThinkPad APS Accelerometer Interface, which discusses the workings of the “Airbag” motion sensor in ThinkPad notebooks.

This should be of particular use to those who are interested in a Linux driver for the ThinkPad accelerometer. Although Mark is not permitted to release any source code yet, he can describe how things work. It should really be trivial to follow his description to create a functional Linux driver.

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