IOCTL interface to SSD1306 modules and a demo

SSD1306 is a 128x64 dot matrix display driver and controller by Solomon Systech. It is used by HelTec display modules.

Reference

SSD1306 Advance Information. 128x64 Dot Matrix OLED/PLED Segment/Common Driver with Controller. Solomon Systech. https://www.adafruit.com/datasheets/SSD1306.pdf