Let's make Linux OTG ports useful...
+To install:
+
+ cd /srv/
+ git clone usb-otg
+ ./install.sh
+
+
+Based on documentation from:
http://www.chip-community.org/index.php/Chip:_USB_hid_on_libcomposite
http://github.com/wismna/raspberry-pi/hackpi
+https://github.com/torvalds/linux/blob/master/Documentation/usb/gadget-testing.txt
+
This setup has been tested on Raspberry Pi 0 and Allwinner A20 based board.