1 files changed, 31 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb
index 5f75f8f7df3..13f3eeee159 100644
--- a/Documentation/ABI/testing/sysfs-bus-usb
+++ b/Documentation/ABI/testing/sysfs-bus-usb
@@ -220,3 +220,34 @@ Description:
                 If the device doesn't support LTM, the file will read "no".
                 The file will be present for all speeds of USB devices, and will
                 always read "no" for USB 1.1 and USB 2.0 devices.
+
+What:           /sys/bus/usb/devices/.../(hub interface)/portX
+Date:           August 2012
+Contact:        Lan Tianyu <tianyu.lan@intel.com>
+Description:
+                The /sys/bus/usb/devices/.../(hub interface)/portX
+                is usb port device's sysfs directory.
+
+What:           /sys/bus/usb/devices/.../(hub interface)/portX/control
+Date:           August 2012
+Contact:        Lan Tianyu <tianyu.lan@intel.com>
+Description:
+                The /sys/bus/usb/devices/.../(hub interface)/portX/control
+                attribute allows user space to control the power policy on
+                the usb port.
+
+                All ports have one of the following two values for control
+                "on" - port power must be on.
+                "off" - port power must be off.
+
+What:           /sys/bus/usb/devices/.../(hub interface)/portX/state
+Date:           August 2012
+Contact:        Lan Tianyu <tianyu.lan@intel.com>
+Description:
+                The /sys/bus/usb/devices/.../(hub interface)/portX/state
+                attribute allows user space to check hub port's power state.
+
+                All ports have three following states
+                "on"      -    port power on
+                "off"     -    port power off
+                "error"   -    can't get the hub port's power state