USB Device Class

• Device Class
  • hub
    • Hub Controller
    • Hub Repeater
    • Transaction Translator
  • human interface(HID)
  • printer
  • imaging
  • mass storage

• USB Device Driver

Introduction

• Linux USB drivers
• Writing USB Device Drivers
• How to Write a Linux USB Device Driver
• Writing a Simple USB Driver
• Linux USB Driver Basics
• Tutorial on USB with Linux
• Programming Guide for Linux USB Device Drivers

usb.h

• <kernel src>/include/linux/usb.h
  • #define USB_DEVICE(vend,prod)
  • struct usb_driver(USB interface driver)
    • const struct usb_device_id *id_table
      • the kernel uses it to find the struct usb_driver associated with the vendor and product id of the inserted device. It then calls that drivers probe method.
    • (*probe)
      • called in the context of the USB hub kernel thread
      • use passed struct usb_interface to make sure it has all of the endpoints you need to function
      • call usb_set_intfdata
      • call usb_register_dev
        • to bind struct usb_interface with struct usb_class_driver
    • (*disconnect)
      • called in the context of the USB hub kernel thread
      • call usb_deregister_dev
  • struct usb_device_driver(USB device driver)
  • usb_register(register a USB interface driver - struct usb_driver)
    • called in XXX_init
    • after registered, call probe/disconnect of usb_driver according to usb_driver.id_table
    • call usb_register_driver
  • usb_deregister
    • called in XXX_exit
    • after registered, call probe/disconnect of usb_driver according to usb_driver.id_table
    • call usb_deregister_driver(unregister a USB interface driver - struct usb_driver)

USB to serial bridges/VCP(Virtual COM Port)

• CP210x Linux Driver
• FTDI - Virtual COM Port Drivers
• The USB Serial Driver
  • The USB Serial Driver Layer Part I, Part II
  • usb edge modem not detected in intrepid

usbnet

• The GNU/Linux "usbnet" Driver Framework