MAX31790_FAN_CFG_TACH_INPUT_EN
*val = !!(data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN);
fan_config &= ~MAX31790_FAN_CFG_TACH_INPUT_EN;
fan_config |= MAX31790_FAN_CFG_TACH_INPUT_EN;
fan_config |= (MAX31790_FAN_CFG_RPM_MODE | MAX31790_FAN_CFG_TACH_INPUT_EN);