Re:AirPods get stuck in low-quality 16 kHz audio mode when s...
by makarhum on Friday December 28, 2018 @03:52AM
(#18775631)
Well, those are mostly just vendor specific drivers.
Actual Bluetooth kernel code can be found here: https://github.com/torvalds/linux/tree/master/net/bluetooth
IMO it is quite well organised and readable.
The Linux source for it is even less approachable.