-void snd_cs4231_out(cs4231_t *chip, unsigned char reg, unsigned char val);
-unsigned char snd_cs4231_in(cs4231_t *chip, unsigned char reg);
-void snd_cs4236_ext_out(cs4231_t *chip, unsigned char reg, unsigned char val);
-unsigned char snd_cs4236_ext_in(cs4231_t *chip, unsigned char reg);
-void snd_cs4231_mce_up(cs4231_t *chip);
-void snd_cs4231_mce_down(cs4231_t *chip);
+void snd_cs4231_out(struct snd_cs4231 *chip, unsigned char reg, unsigned char val);
+unsigned char snd_cs4231_in(struct snd_cs4231 *chip, unsigned char reg);
+void snd_cs4236_ext_out(struct snd_cs4231 *chip, unsigned char reg, unsigned char val);
+unsigned char snd_cs4236_ext_in(struct snd_cs4231 *chip, unsigned char reg);
+void snd_cs4231_mce_up(struct snd_cs4231 *chip);
+void snd_cs4231_mce_down(struct snd_cs4231 *chip);