btn_event
struct btn_event *bev = (void *)arg;
struct btn_event sc_bev[NBUTTON];
btn_event_register(struct btn_event *bev)
btn_event_unregister(struct btn_event *bev)
btn_event_send(struct btn_event *bev, int event)
static LIST_HEAD(, btn_event) btn_event_list;
LIST_ENTRY(btn_event) bev_list;
int btn_event_register(struct btn_event *bev);
void btn_event_unregister(struct btn_event *bev);
void btn_event_send(struct btn_event *, int);