NI Ettus Research USRP E3xx Button support.

modulename: e3x0-button.ko

configname: CONFIG_INPUT_E3X0_BUTTON

Linux Kernel Configuration
└─>Device Drivers
└─>Input device support
└─>Miscellaneous devices
└─>NI Ettus Research USRP E3xx Button support.
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Say Y here to enable support for the NI Ettus Research
USRP E3xx Button.

To compile this driver as a module, choose M here: the
module will be called e3x0_button.

source code: