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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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884316deb4
Pull HID updates from Jiri Kosina: - new hid-alps driver for ALPS Touchpad-Stick device, from Masaki Ota - much improved and generalized HID led handling, and merge of specialized hid-thingm driver into this generic hid-led one, from Heiner Kallweit - i2c-hid power management improvements from Fu Zhonghui and Guohua Zhong - uhid initialization race fix from Roderick Colenbrander * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid: (21 commits) HID: add usb device id for Apple Magic Keyboard HID: hid-led: fix Delcom support on big endian systems HID: hid-led: add support for Greynut Luxafor HID: hid-led: add support for Delcom Visual Signal Indicator G2 HID: hid-led: remove report id from struct hidled_config HID: alps: a few cleanups HID: remove ThingM blink(1) driver HID: hid-led: add support for ThingM blink(1) HID: hid-led: add support for reading from LED devices HID: hid-led: add support for devices with multiple independent LEDs HID: i2c-hid: set power sleep before shutdown HID: alps: match alps devices in core HID: thingm: simplify debug output code HID: alps: pass correct sizes to hid_hw_raw_request() HID: alps: struct u1_dev *priv is internal to the driver HID: add Alps I2C HID Touchpad-Stick support HID: led: fix config usb: misc: remove outdated USB LED driver HID: migrate USB LED driver from usb misc to hid HID: i2c_hid: enable i2c-hid devices to suspend/resume asynchronously ...
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.