Yes, Failing over to the Secondary server and then failback to the original server is possible in Log-Shipping. Please see this helpful video on how to do it . This might help you on what you are doing.

http://www.brentozar.com/archive/2013/02/log-shipping-preparing-for-disaster/

http://www.brentozar.com/archive/2013/03/log-shipping-part-2-when-disaster-strikes-video/