int snd_cs8427_iec958_build(snd_i2c_device_t *cs8427, snd_pcm_substream_t *playback_substream, snd_pcm_substream_t *capture_substream);
int snd_cs8427_iec958_active(snd_i2c_device_t *cs8427, int active);
int snd_cs8427_iec958_pcm(snd_i2c_device_t *cs8427, unsigned int rate);
int snd_cs8427_iec958_build(snd_i2c_device_t *cs8427, snd_pcm_substream_t *playback_substream, snd_pcm_substream_t *capture_substream);
int snd_cs8427_iec958_active(snd_i2c_device_t *cs8427, int active);
int snd_cs8427_iec958_pcm(snd_i2c_device_t *cs8427, unsigned int rate);