Example: USB bus (2)

• Core infrastructure (bus driver)

• drivers/usb/core
• The bus_type is defined in drivers/usb/core/driver.c and registered in drivers/usb/core/usb.c

• Adapter drivers

• drivers/usb/host
• For EHCI, UHCI, OHCI, XHCI, and their implementations on various systems (Atmel, IXP, Xilinx, OMAP, Samsung, PXA, etc.)

• Device drivers

• Everywhere in the kernel tree, classified by their type