ep_wakeup_source
__pm_relax(ep_wakeup_source(epi));
struct wakeup_source *ws = ep_wakeup_source(epi);
ws = ep_wakeup_source(epi);
struct wakeup_source *ws = ep_wakeup_source(epi);
wakeup_source_unregister(ep_wakeup_source(epi));