Exploring BeagleBone: LKMs (by Derek Molloy)  V1.0
This project describes how you can build loadable kernel modules (LKMs) on your BeagleBone platform
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button Directory Reference
Directory dependency graph for button:


file  button.c
 A kernel module for controlling a button (or any signal) that is connected to a GPIO. It has full support for interrupts and for sysfs entries so that an interface can be created to the button or the button can be configured from Linux userspace. The sysfs entry appears at /sys/ebb/gpio115.