1To understand all the Linux-USB framework, you'll use these resources:
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.
9    * The USB 2.0 specification (from, 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".
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.
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 team.
23Here is a list of what each subdirectory here is, and what is contained in
26core/ - This is for the core USB host code, including the
27          usbfs files and the hub class driver ("khubd").
29host/ - 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.
33gadget/ - This is for USB peripheral controller drivers and
34          the various gadget drivers which talk to them.
37Individual USB driver directories. A new driver should be added to the
38first subdirectory in the list below that it fits into.
40image/ - 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.
48serial/ - This is for USB to serial drivers.
49storage/ - This is for USB mass-storage drivers.
50class/ - 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.
53misc/ - This is for all USB device drivers that do not fit
54          into any of the above categories.

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