IBM ThinkPad APS Accelerometer Interface

Finally it seems we have a break through in writing a Linux driver for the accelerometer found in several IBM ThinkPads. Mark A. Smith, an IBM employee, has written a detailed article on how his [unreleased] Linux driver for the APS accelerometer works, and Benjamin Reed shared this information with the people on the hdaps-devel mailing list.

While Mark is not permitted to release his driver source, his article contains detailed information about port ranges and which values to read and write to which port. If the information is accurate and complete, this should be enough to get an open source Linux driver going…

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