---

yaml
---
r: 82255
b: refs/heads/master
c: 979e524
h: refs/heads/master
i:
  82253: 41e9071
  82251: 159f4de
  82247: 692c389
  82239: 4431a57
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 1512300689426cb98bfd7e567ee9fdfaaf61b7c7
+refs/heads/master: 979e524a9c563376af096d2d8629b9969fc06659

trunk/Documentation/ABI/testing/sysfs-bus-usb

@@ -52,3 +52,36 @@ Description:
 		facility is inherently dangerous, it is disabled by default
 		for all devices except hubs.  For more information, see
 		Documentation/usb/persist.txt.
+
+What:		/sys/bus/usb/device/.../power/connected_duration
+Date:		January 2008
+KernelVersion:	2.6.25
+Contact:	Sarah Sharp <sarah.a.sharp@intel.com>
+Description:
+		If CONFIG_PM and CONFIG_USB_SUSPEND are enabled, then this file
+		is present.  When read, it returns the total time (in msec)
+		that the USB device has been connected to the machine.  This
+		file is read-only.
+Users:
+		PowerTOP <power@bughost.org>
+		http://www.lesswatts.org/projects/powertop/
+
+What:		/sys/bus/usb/device/.../power/active_duration
+Date:		January 2008
+KernelVersion:	2.6.25
+Contact:	Sarah Sharp <sarah.a.sharp@intel.com>
+Description:
+		If CONFIG_PM and CONFIG_USB_SUSPEND are enabled, then this file
+		is present.  When read, it returns the total time (in msec)
+		that the USB device has been active, i.e. not in a suspended
+		state.  This file is read-only.
+
+		Tools can use this file and the connected_duration file to
+		compute the percentage of time that a device has been active.
+		For example,
+		echo $((100 * `cat active_duration` / `cat connected_duration`))
+		will give an integer percentage.  Note that this does not
+		account for counter wrap.
+Users:
+		PowerTOP <power@bughost.org>
+		http://www.lesswatts.org/projects/powertop/