A free and open-source graphics device driver is a software stack which controls computer-graphics hardware and supports graphics-rendering application programming interfaces APIs and is released under a free and open-source software license. Graphics device drivers are written for specific hardware to work within a specific operating system kernel and to support a range of APIs used by applications to access the graphics hardware. They may also control output to the display if the display driver is part of the graphics hardware. Most free and open-source graphics device drivers are developed by the Mesa project. The driver is made up of a compiler , a rendering API , and software which manages access to the graphics hardware. Drivers without freely and legally -available source code are commonly known as binary drivers.
Writing a Linux Kernel Module — Part 1: Introduction | lesexpertscomptables.info
This article explains the creation process of a Linux kernel device driver for an undocumented USB device. In addition to the kernel driver I introduce a simple user-space tool that can be used to control the device. Although I have to delve into the specifics of a particular device, the process can be applied to other USB devices as well.
Prepare the System for Building LKMs The system must be prepared to build kernel code, and to do this you must have the Linux headers installed on your device. On a typical Linux desktop machine you can use your package manager to locate the correct package to install. This step is not necessary under the bone70 build.