si70xx_cmd2
error = si70xx_cmd2(sc, SI70XX_READ_ID_PT1A, SI70XX_READ_ID_PT1B,
error = si70xx_cmd2(sc, SI70XX_READ_ID_PT2A, SI70XX_READ_ID_PT2B,
error = si70xx_cmd2(sc, SI70XX_READ_FW_VERA, SI70XX_READ_FW_VERB,