AXP_SENSOR_BATTV
sc->sc_sensor[AXP_SENSOR_BATTV].units = ENVSYS_SVOLTS_DC;
sc->sc_sensor[AXP_SENSOR_BATTV].state = ENVSYS_SINVALID;
sc->sc_sensor[AXP_SENSOR_BATTV].flags = ENVSYS_FHAS_ENTROPY;
snprintf(sc->sc_sensor[AXP_SENSOR_BATTV].desc,
sizeof(sc->sc_sensor[AXP_SENSOR_BATTV].desc), "battery voltage");
sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor[AXP_SENSOR_BATTV]);
case AXP_SENSOR_BATTV: