Samsung Galaxy S2 uses GSD4t GPS chipset, which does not use regular SiRF binary protocol, but some new variant, which is not yet supported by gpsd (as of 2014-06-22 gpsd v.3.10+dev3~d6b65b48-1)
The aim of this project is to create helpful scripts and instructions to help reverse engineer the new protocol, and make a converter to regular SiRF binary protocol (or NMEA).
As of 2015-01-05, much of the data has been reverse engineered, and it seems that the hardware is really dumb; so all processing (downloading ephemeris, calculation pseudoranges, solving GPS location etc.) would have to be done completely in software.
Latest version can be found at GitHub
You may also be interested in sample logs if you lack your own...