]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
usbcore: add autosuspend/autoresume infrastructure
authorAlan Stern <stern@rowland.harvard.edu>
Wed, 30 Aug 2006 19:47:02 +0000 (15:47 -0400)
committerGreg Kroah-Hartman <gregkh@suse.de>
Wed, 27 Sep 2006 18:58:57 +0000 (11:58 -0700)
commit645daaab0b6adc35c1838df2a82f9d729fdb1767
tree908d58f6c0ad01e9c1622a4c12c9c8080c629baa
parentb6956ffa595db97656d5901ca8fec77ef272d41a
usbcore: add autosuspend/autoresume infrastructure

This patch (as739) adds the basic infrastructure for USB autosuspend
and autoresume.  The main features are:

PM usage counters added to struct usb_device and struct
usb_interface, indicating whether it's okay to autosuspend
them or they are currently in use.

Flag added to usb_device indicating whether the current
suspend/resume operation originated from outside or as an
autosuspend/autoresume.

Flag added to usb_driver indicating whether the driver
supports autosuspend.  If not, no device bound to the driver
will be autosuspended.

Mutex added to usb_device for protecting PM operations.
Unlike the device semaphore, the locking rule for the pm_mutex
is that you must acquire the locks going _up_ the device tree.

New routines handling autosuspend/autoresume requests for
interfaces and devices.

Suspend and resume requests are propagated up the device tree
(but not outside the USB subsystem).

work_struct added to usb_device, for carrying out delayed
autosuspend requests.

Autoresume added (and autosuspend prevented) during probe and
disconnect.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/usb/core/driver.c
drivers/usb/core/hub.c
drivers/usb/core/usb.c
drivers/usb/core/usb.h
include/linux/usb.h