1 files changed, 15 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-power b/Documentation/ABI/testing/sysfs-power
index d6a801f45b4..2875f1f74a0 100644
--- a/Documentation/ABI/testing/sysfs-power
+++ b/Documentation/ABI/testing/sysfs-power
@@ -114,3 +114,18 @@ Description:
                 if this file contains "1", which is the default.  It may be
                 disabled by writing "0" to this file, in which case all devices
                 will be suspended and resumed synchronously.
+
+What:           /sys/power/wakeup_count
+Date:           July 2010
+Contact:        Rafael J. Wysocki <rjw@sisk.pl>
+Description:
+                The /sys/power/wakeup_count file allows user space to put the
+                system into a sleep state while taking into account the
+                concurrent arrival of wakeup events.  Reading from it returns
+                the current number of registered wakeup events and it blocks if
+                some wakeup events are being processed at the time the file is
+                read from.  Writing to it will only succeed if the current
+                number of wakeup events is equal to the written value and, if
+                successful, will make the kernel abort a subsequent transition
+                to a sleep state if any wakeup events are reported after the
+                write has returned.