Here's hacking at you, Sony


AKM 8974
The AKM AK8974 magnetic compass returns a 3-D absolute orientation value. There is no datasheet available for this chip, but I have determined that it communicates via the I2C, and have reverse engineered its sensor output protocol.

I2C protocol and table of notable pins
Communications at battery plug-in
Communications at wakeup
Communications during run

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