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-rw-r--r--Documentation/ABI/testing/sysfs-bus-usb24
1 files changed, 24 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb
index b6fbe514a869..13f3eeee1599 100644
--- a/Documentation/ABI/testing/sysfs-bus-usb
+++ b/Documentation/ABI/testing/sysfs-bus-usb
@@ -227,3 +227,27 @@ 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