PM / Sleep: Add "prevent autosleep time" statistics to wakeup sources

Android uses one wakelock statistics that is only necessary for
opportunistic sleep.  Namely, the prevent_suspend_time field
accumulates the total time the given wakelock has been locked
while "automatic suspend" was enabled.  Add an analogous field,
prevent_sleep_time, to wakeup sources and make it behave in a similar
way.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-devices-power b/Documentation/ABI/testing/sysfs-devices-power
index b0a5d9a6135e..45000f0db4d4 100644
--- a/Documentation/ABI/testing/sysfs-devices-power
+++ b/Documentation/ABI/testing/sysfs-devices-power
@@ -158,6 +158,17 @@ Description:
                 not enabled to wake up the system from sleep states, this
                 attribute is not present.
 
+What:           /sys/devices/.../power/wakeup_prevent_sleep_time_ms
+Date:           February 2012
+Contact:        Rafael J. Wysocki <rjw@sisk.pl>
+Description:
+                The /sys/devices/.../wakeup_prevent_sleep_time_ms attribute
+                contains the total time the device has been preventing
+                opportunistic transitions to sleep states from occuring.
+                This attribute is read-only.  If the device is not enabled to
+                wake up the system from sleep states, this attribute is not
+                present.
+
 What:           /sys/devices/.../power/autosuspend_delay_ms
 Date:           September 2010
 Contact:        Alan Stern <stern@rowland.harvard.edu>