Example of device driver

• To illustrate how drivers are implemented to work with the device model, we will study the source code of a driver for a USB network card

• It is USB device, so it has to be a USB device driver
• It is a network device, so it has to be a network device
• Most drivers rely on a bus infrastructure (here, USB) and register themselves in a framework (here, network)

• We will only look at the device driver side, and not the adapter driver side

• The driver we will look at is drivers/net/usb/rtl8150.c