diff --git a/include/sound/ak4114.h b/include/sound/ak4114.h
index 85f49d4..c149d3b25 100644
--- a/include/sound/ak4114.h
+++ b/include/sound/ak4114.h
@@ -188,7 +188,7 @@
 
 int snd_ak4114_create(struct snd_card *card,
 		      ak4114_read_t *read, ak4114_write_t *write,
-		      unsigned char pgm[7], unsigned char txcsb[5],
+		      const unsigned char pgm[7], const unsigned char txcsb[5],
 		      void *private_data, struct ak4114 **r_ak4114);
 void snd_ak4114_reg_write(struct ak4114 *ak4114, unsigned char reg, unsigned char mask, unsigned char val);
 void snd_ak4114_reinit(struct ak4114 *ak4114);
diff --git a/include/sound/ak4117.h b/include/sound/ak4117.h
index 2b96c32..d650d52 100644
--- a/include/sound/ak4117.h
+++ b/include/sound/ak4117.h
@@ -178,7 +178,7 @@
 };
 
 int snd_ak4117_create(struct snd_card *card, ak4117_read_t *read, ak4117_write_t *write,
-		      unsigned char pgm[5], void *private_data, struct ak4117 **r_ak4117);
+		      const unsigned char pgm[5], void *private_data, struct ak4117 **r_ak4117);
 void snd_ak4117_reg_write(struct ak4117 *ak4117, unsigned char reg, unsigned char mask, unsigned char val);
 void snd_ak4117_reinit(struct ak4117 *ak4117);
 int snd_ak4117_build(struct ak4117 *ak4117, struct snd_pcm_substream *capture_substream);
diff --git a/include/sound/ak4xxx-adda.h b/include/sound/ak4xxx-adda.h
index d01d535..aa49dda 100644
--- a/include/sound/ak4xxx-adda.h
+++ b/include/sound/ak4xxx-adda.h
@@ -71,8 +71,8 @@
 	} type;
 
 	/* (array) information of combined codecs */
-	struct snd_akm4xxx_dac_channel *dac_info;
-	struct snd_akm4xxx_adc_channel *adc_info;
+	const struct snd_akm4xxx_dac_channel *dac_info;
+	const struct snd_akm4xxx_adc_channel *adc_info;
 
 	struct snd_ak4xxx_ops ops;
 };