vac_ac97_read
vac_ac97_read(sc, 0x02, &r02); /* master volume */
vac_ac97_read(sc, 0x04, &r04); /* aux/headphone volume */
vac_ac97_read(sc, 0x18, &r18); /* PCM out volume */
vac_ac97_read(sc, 0x26, &r26); /* powerdown ctrl/status */
vac_ac97_read(sc, 0x2a, &r2a); /* extended audio ctrl (VRA) */
vac_ac97_read(sc, 0x2c, &r2c); /* PCM front DAC rate */
vac_ac97_read(sc, 0x7a, &r7a); /* ALC655 vendor (EAPD etc.) */
sc->sc_ac97_host.read = vac_ac97_read;