WM8750_OP_NUM
sc->sc_volume = kmem_zalloc(sizeof(*sc->sc_volume) * WM8750_OP_NUM,
sc->sc_unmute = kmem_zalloc(sizeof(*sc->sc_unmute) * WM8750_OP_NUM,
sizeof(*sc->sc_unmute_toggle) * WM8750_OP_NUM, KM_SLEEP);