AC_VERB_GET_COEF_INDEX
oldindex = snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_COEF_INDEX, 0);
verb = (reg & ~0xfffff) | (AC_VERB_GET_COEF_INDEX << 8);
verb = (reg & ~0xfffff) | (AC_VERB_GET_COEF_INDEX << 8) |
case AC_VERB_GET_COEF_INDEX: