drivers/usb/README

   1 To understand all the Linux-USB framework, you'll use these resources:
   2
   3     * This source code.  This is necessarily an evolving work, and
   4       includes kerneldoc that should help you get a current overview.
   5       ("make pdfdocs", and then look at "usb.pdf" for host side and
   6       "gadget.pdf" for peripheral side.)  Also, Documentation/usb has
   7       more information.
   8
   9     * The USB 2.0 specification (from www.usb.org), with supplements
  10       such as those for USB OTG and the various device classes.
  11       The USB specification has a good overview chapter, and USB
  12       peripherals conform to the widely known "Chapter 9".
  13
  14     * Chip specifications for USB controllers.  Examples include
  15       host controllers (on PCs, servers, and more); peripheral
  16       controllers (in devices with Linux firmware, like printers or
  17       cell phones); and hard-wired peripherals like Ethernet adapters.
  18
  19     * Specifications for other protocols implemented by USB peripheral
  20       functions.  Some are vendor-specific; others are vendor-neutral
  21       but just standardized outside of the www.usb.org team.
  22
  23 Here is a list of what each subdirectory here is, and what is contained in
  24 them.
  25
  26 core/           - This is for the core USB host code, including the
  27                   usbfs files and the hub class driver ("khubd").
  28
  29 host/           - This is for USB host controller drivers.  This
  30                   includes UHCI, OHCI, EHCI, and others that might
  31                   be used with more specialized "embedded" systems.
  32
  33 gadget/         - This is for USB peripheral controller drivers and
  34                   the various gadget drivers which talk to them.
  35
  36
  37 Individual USB driver directories.  A new driver should be added to the
  38 first subdirectory in the list below that it fits into.
  39
  40 image/          - This is for still image drivers, like scanners or
  41                   digital cameras.
  42 ../input/       - This is for any driver that uses the input subsystem,
  43                   like keyboard, mice, touchscreens, tablets, etc.
  44 ../media/       - This is for multimedia drivers, like video cameras,
  45                   radios, and any other drivers that talk to the v4l
  46                   subsystem.
  47 ../net/         - This is for network drivers.
  48 serial/         - This is for USB to serial drivers.
  49 storage/        - This is for USB mass-storage drivers.
  50 class/          - This is for all USB device drivers that do not fit
  51                   into any of the above categories, and work for a range
  52                   of USB Class specified devices.
  53 misc/           - This is for all USB device drivers that do not fit
  54                   into any of the above categories.