How does RPCS3 handle DS3 gyro input?

RPCS3's DualShock3 handler supports the yaw-only dualshock 3 gyroscope axis for real Sony controllers. How does it implement this in Linux?

I want to get it implemented in the Dolphin emulator as well, but they say it's too hard, and that even the Linux kernel developers consider it too hard to support
https://github.com/torvalds/linux/blob/2...ny.c#L1105

I found this RPCS3 github file which seems like it could help, but I'm not a developer
https://github.com/RPCS3/rpcs3/blob/e32c...er.cpp#L83

or is there a better place to ask this question in?
thanks