changer_move_request
struct changer_move_request cmd;
static int ch_move(struct ch_softc *, struct changer_move_request *);
error = ch_move(sc, (struct changer_move_request *)data);
ch_move(struct ch_softc *sc, struct changer_move_request *cm)
#define CHIOMOVE _IOW('c', 0x01, struct changer_move_request)