PSVC_TEMP_DIFFERENTIAL_INDEX_ATTR
case PSVC_TEMP_DIFFERENTIAL_INDEX_ATTR:
case PSVC_TEMP_DIFFERENTIAL_INDEX_ATTR:
err = psvc_get_attr(hdlp, fan_id, PSVC_TEMP_DIFFERENTIAL_INDEX_ATTR,
err = psvc_set_attr(hdlp, fan_id, PSVC_TEMP_DIFFERENTIAL_INDEX_ATTR,