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- To understand all the Linux-USB framework, you'll use these resources:
- * This source code. This is necessarily an evolving work, and
- includes kerneldoc that should help you get a current overview.
- ("make pdfdocs", and then look at "usb.pdf" for host side and
- "gadget.pdf" for peripheral side.) Also, Documentation/usb has
- more information.
- * The USB 2.0 specification (from www.usb.org), with supplements
- such as those for USB OTG and the various device classes.
- The USB specification has a good overview chapter, and USB
- peripherals conform to the widely known "Chapter 9".
- * Chip specifications for USB controllers. Examples include
- host controllers (on PCs, servers, and more); peripheral
- controllers (in devices with Linux firmware, like printers or
- cell phones); and hard-wired peripherals like Ethernet adapters.
- * Specifications for other protocols implemented by USB peripheral
- functions. Some are vendor-specific; others are vendor-neutral
- but just standardized outside of the www.usb.org team.
- Here is a list of what each subdirectory here is, and what is contained in
- them.
- core/ - This is for the core USB host code, including the
- usbfs files and the hub class driver ("hub_wq").
- host/ - This is for USB host controller drivers. This
- includes UHCI, OHCI, EHCI, and others that might
- be used with more specialized "embedded" systems.
- gadget/ - This is for USB peripheral controller drivers and
- the various gadget drivers which talk to them.
- Individual USB driver directories. A new driver should be added to the
- first subdirectory in the list below that it fits into.
- image/ - This is for still image drivers, like scanners or
- digital cameras.
- ../input/ - This is for any driver that uses the input subsystem,
- like keyboard, mice, touchscreens, tablets, etc.
- ../media/ - This is for multimedia drivers, like video cameras,
- radios, and any other drivers that talk to the v4l
- subsystem.
- ../net/ - This is for network drivers.
- serial/ - This is for USB to serial drivers.
- storage/ - This is for USB mass-storage drivers.
- class/ - This is for all USB device drivers that do not fit
- into any of the above categories, and work for a range
- of USB Class specified devices.
- misc/ - This is for all USB device drivers that do not fit
- into any of the above categories.
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