original development tree for Linux kernel GTP module; now long in mainline.
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Eric W. Biederman 7f78e03513 fs: Limit sys_mount to only request filesystem modules. 9 years ago
..
atm Merge branch 'for-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 9 years ago
c67x00 USB: c67x00-ll-hpi.c: signedness bug in ll_recv_msg() 9 years ago
chipidea Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 9 years ago
class Merge 3.8-rc5 into tty-next 9 years ago
core Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 9 years ago
dwc3 drivers/usb: add missing GENERIC_HARDIRQS dependencies 9 years ago
early fix build of EHCI debug port code when USB_CHIPIDEA but !USB_EHCI_HCD 9 years ago
gadget fs: Limit sys_mount to only request filesystem modules. 9 years ago
host USB patch revert for 3.9-rc1 9 years ago
image USB: mdc800.c: remove dbg() usage 10 years ago
misc USB: altsetting overrides for usbtest 9 years ago
mon mm: kill vma flag VM_RESERVED and mm->reserved_vm counter 9 years ago
musb USB patches for 3.9-rc1 9 years ago
otg USB patches for 3.9-rc1 9 years ago
phy arm-soc: soc-specific updates 9 years ago
renesas_usbhs USB patches for 3.9-rc1 9 years ago
serial tty/serial patches for 3.9-rc1 9 years ago
storage USB: usb-storage: unusual_devs update for Super TOP SATA bridge 9 years ago
wusbcore USB: wusbcore/wa-xfer: error handling fixes in setup_segs() 9 years ago
Kconfig USB: select USB_ARCH_HAS_EHCI for MXS 9 years ago
Makefile usb: phy: Fix Kconfig dependency for Phy drivers 9 years ago
README [Blackfin] arch: Add a note describing what is going on - no functional changes 14 years ago
usb-common.c usb: Provide usb_speed_string() function 10 years ago
usb-skeleton.c USB: usb-skeleton.c: fix compilation error and restored kref_put on fail in skel_open 9 years ago

README

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.