linux/drivers/usb
Alan Stern 57e06c1137 EHCI: force high-speed devices to run at full speed
This patch (as710) adds a sysfs class-device attribute file named
"companion" for EHCI controllers.  The file contains a list of port
numbers that are dedicated to the companion controller; by writing a
port number to the file the user can force a high-speed device
attached directly to the computer to run at full speed.  (As far as I
know it is not possible to do this for a device attached to an
external hub.)  A port is removed from the file by writing the
negative of its port number.

Several users have asked for this facility and it seems like a useful
thing to have.  Every now and then one runs across a device which
behaves much better at full speed than at high speed.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-02-07 15:44:37 -08:00
..
atm USB: <linux/usb_ch9.h> becomes <linux/usb/ch9.h> 2007-02-07 15:44:32 -08:00
class USB: usblp.c - add Kyocera Mita FS 820 to list of "quirky" printers 2007-01-05 12:19:10 -08:00
core usbcore: remove unused bandwith-related code 2007-02-07 15:44:37 -08:00
gadget usb: gadgetfs remove delayed init mode 2007-02-07 15:44:35 -08:00
host EHCI: force high-speed devices to run at full speed 2007-02-07 15:44:37 -08:00
image USB: race on disconnect in mdc800 2007-02-07 15:44:34 -08:00
input USB: ps3 controller hid quirk 2007-02-07 15:44:36 -08:00
misc USB: mutexification of rio500 2007-02-07 15:44:32 -08:00
mon USB: add binary API to usbmon 2007-02-07 15:44:34 -08:00
net USB: better ethtool support for kaweth 2007-02-07 15:44:35 -08:00
serial USB: Bugfix for aircable: Add module and name to usb_serial_driver 2007-02-07 15:44:34 -08:00
storage usb-storage: SCSI level fixes 2007-02-07 15:44:35 -08:00
Kconfig [ARM] 3963/1: AT91: Update configuration files 2006-12-01 16:56:43 +00:00
Makefile USB: move trancevibrator.c to the proper usb directory 2006-10-17 14:46:32 -07:00
README Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
usb-skeleton.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00

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.