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authorSarah Sharp <sarah.a.sharp@linux.intel.com>2008-10-06 14:45:46 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2008-10-17 14:41:03 -0700
commit49e7cc84a86784ef2ab4e651f1824093be8f5b2b (patch)
tree0bd664b1df6cd48382bcb51771ca3eac362697ee /Documentation
parenteafe5b99f2135488b21cf17a262c54997c44f784 (diff)
downloadlinux-linaro-stable-49e7cc84a86784ef2ab4e651f1824093be8f5b2b.tar.gz
USB: Export if an interface driver supports autosuspend.
Create a new sysfs file per interface named supports_autosuspend. This file returns true if an interface driver's .supports_autosuspend flag is set. It also returns true if the interface is unclaimed (since the USB core will autosuspend a device if an interface is not claimed). This new sysfs file will be useful for user space scripts to test whether a USB device correctly auto-suspends. Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Cc: Oliver Neukum <oliver@neukum.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/ABI/testing/sysfs-bus-usb16
1 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb
index 11a3c1682cec..df6c8a0159f1 100644
--- a/Documentation/ABI/testing/sysfs-bus-usb
+++ b/Documentation/ABI/testing/sysfs-bus-usb
@@ -85,3 +85,19 @@ Description:
Users:
PowerTOP <power@bughost.org>
http://www.lesswatts.org/projects/powertop/
+
+What: /sys/bus/usb/device/<busnum>-<devnum>...:<config num>-<interface num>/supports_autosuspend
+Date: January 2008
+KernelVersion: 2.6.27
+Contact: Sarah Sharp <sarah.a.sharp@intel.com>
+Description:
+ When read, this file returns 1 if the interface driver
+ for this interface supports autosuspend. It also
+ returns 1 if no driver has claimed this interface, as an
+ unclaimed interface will not stop the device from being
+ autosuspended if all other interface drivers are idle.
+ The file returns 0 if autosuspend support has not been
+ added to the driver.
+Users:
+ USB PM tool
+ git://git.moblin.org/users/sarah/usb-pm-tool/