PCF8584_S0
sc->sc_regmap[PCF8584_S0] = PCF8584_S0;
sc->sc_regmap[PCF8584_S0] ^= 1;
sc->sc_pcfdev.sc_regmap[PCF8584_S0] = PCF8584_S0 << reg_shift;
pcfiic_write(sc, PCF8584_S0, addr << 1);
pcfiic_write(sc, PCF8584_S0, cmdbuf[i]);
pcfiic_write(sc, PCF8584_S0, buf[i - cmdlen]);
pcfiic_write(sc, PCF8584_S0, (addr << 1) | 0x01);
pcfiic_write(sc, PCF8584_S0, (addr << 1) | 0x01);
pcfiic_read(sc, PCF8584_S0);
r = pcfiic_read(sc, PCF8584_S0);
pcfiic_write(sc, PCF8584_S0, sc->sc_addr);
pcfiic_write(sc, PCF8584_S0, sc->sc_clock);