HID: wacom: Avoid sending empty sync events
Empty sync events clutter up logs and are a waste of CPU cycles. We can avoid sending mt_sync events if touch is disabled or a specific slot is unused. We can avoid sending full sync events if no events were generated. Signed-off-by: Ping Cheng <ping.cheng@wacom.com> Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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5bed0128
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