Shortly after the Launchpad came out, a driver was written for it - but this is perhaps merged into the Linux kernel by now (thread is from 2010) ?
http://forum.renoise…aunchpad-linux/
Note that you basically get bidirectional communication only if using a tool which “knows” how to communicate with the Launchpad - it has special codes for setting pad colors, etc.
A tool like Duplex generally has many different configurations for the Launchpad, and you should also be able to use the Lauflicht sequencer, Cells! etc.
So you would basically sidestep the normal Renoise MIDI device and instead select the Launchpad from within the tool itself