A lot of boards have LEDs on the front, it is useful to be able to 
control these LEDs from userland.  I have implemented a start at a 
device driver front-end for this that gives a generic interface.  I'd 
appreciate comments on it.  I have not tied things like the num lock 
LEDs to this, but that might be doable later.

Although it doesn't include it right now, this could be extended to add 
things like 7-segment LEDs, scrolling displays, etc.

The basic thought is to allow low-level LED drivers to register with 
this with a name and capabilities.  This driver would give a consistent 
way to advertise and use those capabilities to the user application, so 
it could discover LEDs by name, know their capabilities, etc.

-Corey