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PM / wakeup: Export wakeup_count instead of event_count via sysfs

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Currently we export event_count instead of wakeup_count via the
per-device wakeup_count sysfs attribute. Change it to wakeup_count
to make it more meaningful.

wakeup_count increments only when events_check_enabled is set,
that is whenever writes the current wakeup count to
/sys/power/wakeup_count.  Also events_check_enabled is cleared on
every resume. User space is expected to write to this just before
suspend.  This way pm_wakeup_event(), when called from IRQs handles,
will increment wakeup_count only if we are in system-wide
suspend-resume cycle and should give a fair approximation of how many
times a device may have triggered a wakeup from system suspend.

event_count on the other hand will increment every time
pm_wakeup_event() is called irrespective of whether we are in a
suspend-resume cycle and some drivers call it on every interrupt
which makes it less useful for system wakeup tracking.

Signed-off-by: Ravi Chandra Sadineni <[email protected]>
Acked-by: Pavel Machek <[email protected]>
[ rjw: Subject & changelog ]
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Ravi Chandra Sadineni 2018-06-01 19:32:15 -07:00 • committed by Rafael J. Wysocki
commit 2d5ed61ce9
1 changed files with 1 additions and 1 deletions
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2
drivers/base/power/sysfs.c
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@ -353,7 +353,7 @@ static ssize_t wakeup_count_show(struct device *dev,
spin_lock_irq(&dev->power.lock);
if (dev->power.wakeup) {
count = dev->power.wakeup->event_count;
count = dev->power.wakeup->wakeup_count;
enabled = true;
}
spin_unlock_irq(&dev->power.lock);