carrier synchronization for CPFSK demodulation

I was wondering how to do carrier synchronization for CPFSK signals? 

I want to decode the CPFSK signal by computing the phase difference. The
shape of the phase difference is similar to the following plot
      |---|   |---|       fc+fd/2
 - - -|- -| - | - | - - - fc
   ---|   |---|   |---    fc-fd/2

where fc is the carrier, fd is the peak frequency deviation.

Before send this demodulated data into the soft slicer, I have to build the
sample clock and recover the carrier frequency. 

I plan to use the Gardner (or similar) detector to do the timing
synchronization. The input to the TED is just the phase difference as shown
above.
 
But　Ｉ　ａｍ　ｎｏｔ　ｓｕｒｅ　ｈｏｗ　ｔｏ　ｄｏ　ｔｈｅ　ｃａｒｒｉｅｒ　ｓｙｎｃｈｒｏｎｉｃａｔｉｏｎ．　Can
anyone point me a method how to do this? 

Thanks a lot!