This is a Linux driver for the Olympus MAJ-1428 medical keyboard.
The source code has been intentionally over-annotated for educational purposes.
For whatever reason, the 5.13 kernel's HID driver is missing support for 3 of the 9 special keys on the top of the keyboard (in the purple area). I wanted to write a driver that would fix that, and also map the rest of the special keys to function keys instead of normal characters.
Before you start, you'll need to install the header files for your kernel.
Run:
$ sudo apt install linux-headers-$(uname -r)Next, run make in the root directory of this repository.
This will compile your kernel module (.ko file).
You might get a warning that says:
Skipping BTF generation for hid-olympus-maj1428.ko due to unavailability of vmlinux
That's okay.
Run:
$ sudo insmod hid-olympus-maj1428.ko Now you can use the device as needed.
If you want to go back to using the built-in kernel driver instead, you can remove this kernel module:
$ sudo rmmod hid-olympus-maj1428.ko