ess_rd
static int ess_rd(struct ess_info *sc, int reg);
return ((ess_rd(sc, SBDSP_STATUS) & 0x80) == 0);
val = ess_rd(sc, SB_MIX_DATA);
if (ess_rd(sc, 0xc) & 0x40)
return ess_rd(sc, DSP_READ);
if (ess_rd(sc, 0x0c) & 0x01)
ess_rd(sc, DSP_DATA_AVAIL);