PM / Sleep: Change wakeup source statistics to follow Android

Wakeup statistics used by Android are slightly different from what we
have in wakeup sources at the moment and there aren't any known
users of those statistics other than Android, so modify them to make
it easier for Android to switch to wakeup sources.

This removes the struct wakeup_source's hit_cout field, which is very
rough and therefore not very useful, and adds two new fields,
wakeup_count and expire_count.  The first one tracks how many times
the wakeup source is activated with events_check_enabled set (which
roughly corresponds to the situations when a system power transition
to a sleep state is in progress and would be aborted by this wakeup
source if it were the only active one at that time) and the second
one is the number of times the wakeup source has been activated with
a timeout that expired.

Additionally, the last_time field is now updated when the wakeup
source is deactivated too (previously it was only updated during
the wakeup source's activation), which seems to be what Android does
with the analogous counter for wakelocks.

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

1 files changed, 17 insertions, 7 deletions

diff --git a/Documentation/ABI/testing/sysfs-devices-power b/Documentation/ABI/testing/sysfs-devices-power
index 840f7d64d483..b0a5d9a6135e 100644
--- a/Documentation/ABI/testing/sysfs-devices-power
+++ b/Documentation/ABI/testing/sysfs-devices-power
@@ -96,16 +96,26 @@ Description:
                 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/wakeup_hit_count
-Date:           September 2010
+What:           /sys/devices/.../power/wakeup_abort_count
+Date:           February 2012
 Contact:        Rafael J. Wysocki <rjw@sisk.pl>
 Description:
-                The /sys/devices/.../wakeup_hit_count attribute contains the
+                The /sys/devices/.../wakeup_abort_count attribute contains the
                 number of times the processing of a wakeup event associated with
-                the device might prevent the system from entering a sleep state.
-                This attribute is read-only.  If the device is not enabled to
-                wake up the system from sleep states, this attribute is not
-                present.
+                the device might have aborted system transition into a sleep
+                state in progress.  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/wakeup_expire_count
+Date:           February 2012
+Contact:        Rafael J. Wysocki <rjw@sisk.pl>
+Description:
+                The /sys/devices/.../wakeup_expire_count attribute contains the
+                number of times a wakeup event associated with the device has
+                been reported with a timeout that expired.  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/wakeup_active
 Date:           September 2010