-unsigned char pdacf_ak4117_read(void *private_data, unsigned char reg);
-void pdacf_ak4117_write(void *private_data, unsigned char reg, unsigned char val);
-pdacf_t *snd_pdacf_create(snd_card_t *card);
-int snd_pdacf_ak4117_create(pdacf_t *pdacf);
-void snd_pdacf_powerdown(pdacf_t *chip);
+struct snd_pdacf *snd_pdacf_create(struct snd_card *card);
+int snd_pdacf_ak4117_create(struct snd_pdacf *pdacf);
+void snd_pdacf_powerdown(struct snd_pdacf *chip);