linux/drivers/usb
Alan Stern d58b4bcc6d USB: EHCI: introduce high-res timer
This patch (as1572) begins the conversion of ehci-hcd over to using
high-resolution timers rather than old-fashioned low-resolution kernel
timers.  This reduces overhead caused by timer roundoff on systems
where HZ is smaller than 1000.  Also, the new timer framework
introduced here is much more logical and easily extended than the
ad-hoc approach ehci-hcd currently uses for timers.

An hrtimer structure is added to ehci_hcd, along with a bitflag array
and an array of ktime_t values, to keep track of which timing events
are pending and what their expiration times are.

Only the infrastructure for the timing operations is added in this
patch.  Later patches will add routines for handling each of the
various timing events the driver needs.  In some cases the new hrtimer
handlers will replace the existing handlers for ehci-hcd's kernel
timers; as this happens the old timers will be removed.  In other
cases the new timing events will replace busy-wait loops.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-16 16:53:16 -07:00
..
atm
c67x00
chipidea usb: chipidea: add imx platform driver 2012-07-09 10:01:09 -07:00
class Merge 3.5-rc7 into usb-next 2012-07-16 13:16:09 -07:00
core Merge 3.5-rc7 into usb-next 2012-07-16 13:16:09 -07:00
dwc3 usb: dwc3: patches for v3.6 merge window 2012-07-05 15:15:38 -07:00
early usb: early: fixed coding style issue related to : operator 2012-06-13 16:07:22 -07:00
gadget usb: phy: patches for v3.6 merge window 2012-07-05 15:35:41 -07:00
host USB: EHCI: introduce high-res timer 2012-07-16 16:53:16 -07:00
image
misc
mon
musb usb: phy: patches for v3.6 merge window 2012-07-05 15:35:41 -07:00
otg usb: otg: add basic mxs phy driver support 2012-07-09 09:59:23 -07:00
phy usb: phy: Fix Kconfig dependency for Phy drivers 2012-06-26 16:14:33 -07:00
renesas_usbhs usb: renesas_usbhs: use dmaengine helper functions 2012-07-09 09:48:26 -07:00
serial Merge 3.5-rc7 into usb-next 2012-07-16 13:16:09 -07:00
storage usb: storage: update usb devices for write cache quirk in quirk list. 2012-07-16 16:46:22 -07:00
wusbcore
Kconfig usb: move ci13xxx and related code to drivers/usb/chipidea 2012-05-11 16:45:30 -07:00
Makefile usb: phy: Fix Kconfig dependency for Phy drivers 2012-06-26 16:14:33 -07:00
README
usb-common.c
usb-skeleton.c

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.