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mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-25 05:34:00 +08:00
linux-next/drivers/usb
Sarah Sharp 063ebeb433 xhci: Report USB 2.1 link status for L1
USB 2.1 devices can go into a lower power link state, L1.  When they are
active, they are in the L0 state.  The L1 transition can be purely
driven by software, or some USB host controllers (including some xHCI
1.0 hosts) allow the host hardware to track idleness and automatically
place a port into L1.

The USB 2.1 Link Power Management ECN gives a way for USB 2.1 hubs that
support LPM to report that a port is in L1.  The port status bit 5 will
be set when the port is in L1.  The xHCI host reports the root port as
being in 'U2' when the devices is in L1, and as being in 'U0' when the
port is active (in L0).

Translate the xHCI USB 2.1 link status into the format external hubs
use, and pass the L1 status up to the USB core and tools like lsusb.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
2013-07-23 14:19:19 -07:00
..
atm drivers: avoid parsing names as kthread_run() format strings 2013-07-03 16:07:41 -07:00
c67x00 usb: c67x00 RetryCnt value in c67x00 TD should be 3 2013-03-07 12:31:37 +08:00
chipidea Device tree updates for v3.11 2013-07-04 15:51:45 -07:00
class USB: cdc-acm: remove unneeded spin_lock_irqsave/restore on write path 2013-06-17 13:37:07 -07:00
core Power management and ACPI updates for 3.11-rc1 2013-07-03 14:35:40 -07:00
dwc3 usb: patches for v3.11 merge window 2013-06-12 14:44:13 -07:00
early
gadget Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2013-07-13 12:09:57 -07:00
host xhci: Report USB 2.1 link status for L1 2013-07-23 14:19:19 -07:00
image USB: regroup all depends on USB within an if USB block 2013-04-09 16:49:07 -07:00
misc Merge branch 'exotic-arch-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k 2013-07-03 11:12:08 -07:00
mon USB: regroup all depends on USB within an if USB block 2013-04-09 16:49:07 -07:00
musb Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2013-07-04 11:40:58 -07:00
phy For the 3.11 merge we only have one new MFD driver for the Kontron PLD. 2013-07-10 11:10:27 -07:00
renesas_usbhs USB: regroup all depends on USB within an if USB block 2013-04-09 16:49:07 -07:00
serial USB: option,qcserial: move Novatel Gobi1K IDs to qcserial 2013-06-24 16:21:53 -07:00
storage Merge 3.10-rc3 into usb-next 2013-05-27 11:00:52 +09:00
wusbcore USB: HWA: fix device probe failure 2013-06-24 16:20:43 -07:00
Kconfig USB: Check for ARCH_EXYNOS separately 2013-06-19 01:25:48 +09:00
Makefile usb host: Faraday USB2.0 FUSBH200-HCD driver 2013-05-17 10:12:52 -07:00
README
usb-common.c usb: add devicetree helpers for determining dr_mode and phy_type 2013-06-17 13:47:09 -07:00
usb-skeleton.c USB: usb-skeleton.c: fix blocked forever in skel_read 2013-03-25 13:32:20 -07:00

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.