+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.
+ usbfs files and the hub class driver ("khubd").
-host/ - This is for all of the USB host drivers. This
- includes UHCI, OHCI, EHCI, and any others that might
- be created in the future.
+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 all of the USB device controller drivers.
+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
git://git.onelab.eu / linux-2.6.git / blobdiff