kernel/Documentation/ABI/testing/sysfs-devices-resource_in_use

   1 What:           /sys/devices/.../resource_in_use
   2 Date:           January 2013
   3 Contact:        Rafael J. Wysocki <rafael.j.wysocki@intel.com>
   4 Description:
   5                 The /sys/devices/.../resource_in_use attribute is only present
   6                 for device objects representing ACPI power resources.
   7
   8                 If present, it contains a number (0 or 1) representing the
   9                 current status of the given power resource (0 means that the
  10                 resource is not in use and therefore it has been turned off).
  11
  12                 This attribute is read-only.