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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 ("khubd").
+
+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.