MAX31790_FAN_CFG_CTRL_MON
if (fan_config & MAX31790_FAN_CFG_CTRL_MON)
fan_config |= MAX31790_FAN_CFG_CTRL_MON;
fan_config &= ~(MAX31790_FAN_CFG_CTRL_MON | MAX31790_FAN_CFG_RPM_MODE);
fan_config &= ~MAX31790_FAN_CFG_CTRL_MON;