PCF8584_CTRL_PIN
pcfiic_write(sc, PCF8584_S1, PCF8584_CTRL_PIN);
pcfiic_write(sc, PCF8584_S1, PCF8584_CTRL_PIN | PCF8584_CTRL_ES1);
#define PCF8584_CMD_START (PCF8584_CTRL_PIN | PCF8584_CTRL_ESO | \
#define PCF8584_CMD_STOP (PCF8584_CTRL_PIN | PCF8584_CTRL_ESO | \
#define PCF8584_CMD_IDLE (PCF8584_CTRL_PIN | PCF8584_CTRL_ESO | \