Maltron L90 keyboard

modulename: hid-maltron.ko

configname: CONFIG_HID_MALTRON

Linux Kernel Configuration
└─>Device Drivers
└─>HID bus support
└─>Special HID drivers
└─>Maltron L90 keyboard
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
Adds support for the volume up, volume down, mute, and play/pause buttons
of the Maltron L90 keyboard.

source code:
drivers/hid/hid-maltron.c