[PATCH] Heartbeat LED for iBook

Segher Boessenkool segher at kernel.crashing.org
Sat Feb 19 05:10:42 EST 2005

> There is some minimal documentation available. Some Apple docs:
> ADB-The Untold Story: Space Aliens Ate My Mouse
> http://developer.apple.com/technotes/hw/hw_01.html
> Inside Macintosh: Devices / Chapter 5 - ADB Manager
> http://developer.apple.com/documentation/mac/Devices/Devices-203.html
> These will tell you the basic design of ADB as well as the packet
> formats and information about keyboards and mice.
> Note that these document ADB in a generic sense, so nothing PMU
> specific is in them. Apple has been very reluctant to document
> the PMU and it's functions.

ADB has nothing to do with the PMU (well, the PMU emulates an ADB
device, sort of).

The Linux kernel multiplexes the /dev/adb device to also serve as
a channel to the PMU, though.  This ugliness should be fixed, some


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