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This pull request is quite big, but mainly because there's a giant rework of the s3c_hsotg.c driver to make it friendlier for other users. Samsung Exynos platforms use the DesignWare Core USB2 IP from Synopsys so it's a bit unfair to have the driver work for Samsung platforms only. In short, the big rework is in preparation to make the driver more reusable. Another big rework in this pull request came from Ido, where he's removing the redundant pointer for the endpoint descriptor from the controller driver's own endpoint representation. The same pointer is available through the generic struct usb_ep structure. Also on this pull request is the conversion of a few extra controller drivers to the new style registration, which allows multiple controllers to be available on the same platform and helps remove global pointers from those drivers. Together with those big changes, there's the usual fixes and cleanups to gadget drivers. Nothing major. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAABAgAGBQJPp3l8AAoJEIaOsuA1yqRECjkP/3mScTFWEgjQsa7ynlYW6bfE 9uI3yP0VPws8EK0MBIOeXOhz7z/x/of/9XEEvnVjqnVkXlYc23IEJactbc1sYHQY WsUyeuD6D+W5UHkomV0W8Xh1agVeW9QYDubQxI62KL81pWCC3MVa+BfW+430lrdi 7FUxWykCByYu1VYNZYfaGFyKalkpOpIydFtAZp2ykawUJMyB1PPl+2uzA1u/zB9A Tm6E2Su+CzWp59/Udc64O25FhPo/g5GQWX2VbO1XneUrpNQgfihq6RjSi3hHYZdq NkeR0eWwc5KeWZfsfm57AErQlN97uP3fAUSHz9o6c5N9V7bW221sCh4ZH3s32+IB Dnps2WbW7IslUntYd1GyakfRILTrhMbg7GJZbmxdzWmIK6Pv0NLISPq4bZ64QJOH iqa8NtluN0m1DSwUNX7UBHQZ6Cj1X3xZIdAJvdg4IlqUJ+Q2UmgCG9/kloF1H0C3 QnRXUEgbmMZ42sVVWEafUhwfEQTNFJyWd7OpFuyo8R3vARJg/miaEy7Lf+IqpRxD 5WV6o/TVCL2c6lQP2NbJoCSr10K2VcHOJpUS8cYv6K+ZIyTbKvOh8rlArX2+/W3a YZtd+nfq2FyuRVxAasXwpsVCDT319LWt+Myq+9cl23+PyN54j+OnhHPJr15tBru1 OB/Z6arXyc17Gq/Ng2ur =irDV -----END PGP SIGNATURE----- Merge tag 'gadget-for-v3.5' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next usb: gadget: patches for v3.5 This pull request is quite big, but mainly because there's a giant rework of the s3c_hsotg.c driver to make it friendlier for other users. Samsung Exynos platforms use the DesignWare Core USB2 IP from Synopsys so it's a bit unfair to have the driver work for Samsung platforms only. In short, the big rework is in preparation to make the driver more reusable. Another big rework in this pull request came from Ido, where he's removing the redundant pointer for the endpoint descriptor from the controller driver's own endpoint representation. The same pointer is available through the generic struct usb_ep structure. Also on this pull request is the conversion of a few extra controller drivers to the new style registration, which allows multiple controllers to be available on the same platform and helps remove global pointers from those drivers. Together with those big changes, there's the usual fixes and cleanups to gadget drivers. Nothing major.
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.