IICHID_PS_NULL
error = iichid_set_power_state(sc, IICHID_PS_NULL, IICHID_PS_OFF);
error = iichid_set_power_state(sc, IICHID_PS_NULL, IICHID_PS_ON);
how_request = how_open == IICHID_PS_NULL ? IIC_WAIT : IIC_INTRWAIT;
case IICHID_PS_NULL:
case IICHID_PS_NULL:
iichid_set_power_state(sc, IICHID_PS_ON, IICHID_PS_NULL);
iichid_set_power_state(sc, IICHID_PS_OFF, IICHID_PS_NULL);