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+What:           /sys/devices/.../resource_in_use
+Date:           January 2013
+Contact:        Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+Description:
+                The /sys/devices/.../resource_in_use attribute is only present
+                for device objects representing ACPI power resources.
+
+                If present, it contains a number (0 or 1) representing the
+                current status of the given power resource (0 means that the
+                resource is not in use and therefore it has been turned off).
+
+                This attribute is read-only.