ADB probing

[Michael Schmitz]

> >I can help writing and testing this on a Powerbook, I just don't have a
> >desktop Mac to connect multiple ADB devices to. 
> 
> My idea was to work on this this Sunday, but if you want to write it now,
> feel free to do so ;) I can test it on various configurations at work.

It took a bit longer, but I actually got something to start with. I've only
implemented exclusive access to devices and a simple autopoll data buffering 
so far. I still need to conditionalize the gobs of debug messages but it's
now possible to take over a specific device from user space and get the
autopoll data from it (tested with a hacked version of the trackpad tool that
would take over the trackpad for 10 seconds). 
I haven't implemented poll yet, and there's a few implementation details that 
need discussion. Did you do any work on this yet? I'd send a diff (relative
to 2.2.12) otherwise for you to test. 

	Michael

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