Do you have a Guitar Hero Live (PS3) 6-fret guitar or perhaps one from the Wii U that you want to use on Linux? Prepare to dust them off.
The new hid-ghlive-dkms driver from developer Pascal Giard, was created as they "really wanted to play a 6-fret guitar on Clone Hero". For those not aware, Clone Hero is a free rhythm game (a clone of Guitar Hero - get it?), which can be played with any 5 or 6 button guitar controller, game controllers, or just your standard computer keyboard.
Currently this new driver only supports the Wii U and PS3 dongles, with support for the PS4 version being looked into and will hopefully work with it when they figure it out.
Once again another case of why open source is important: preservation. Ensuring that hardware you buy can continue working many years after the original creator moves on. You should be able to use your hardware and accessories wherever you want. Another great project. The developer has mentioned they do intend to get this up-streamed into the Linux Kernel too.
You can find it on GitHub.