Logitech devices

modulename: hid-lg-g15.ko

and/or

hid-logitech.ko

configname: CONFIG_HID_LOGITECH

Linux Kernel Configuration
└─>Device Drivers
└─>HID Devices
└─>Special HID drivers
└─>Logitech devices
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
Support for Logitech devices that are not fully compliant with HID standard.

source code:
drivers/hid/