CS5535 input/output

Hello, I'm beggining using my DSP and I've been looking for a way how to manipulate input and ouput.the problem is when i use 2 ligne inputs ( left mico and rignt micro ) i had only output in left headphone, the right output didn't work.

     aic3204_codec_read(&left_input, &right_input);
     left_output =  left_input;  
     right_output = right_input;       
     aic3204_codec_write(left_output, right_output);