Joerg and I prepared a white paper describing the planned infrared subsystem:

http://neo900.org/stuff/papers/ir.pdf

To a large part, this is a specification of what we'd like to have in the end, but there may still be changes if issues crop up. We expect to update the document from time to time as things settle down.

This specific version is at
http://neo900.org/stuff/papers/ir-20140827.pdf

The source can be found at
http://neo900.org/git/?p=misc;a=tree;f=ir

- Werner