#define to_vxpocket(x) container_of(x, struct snd_vxpocket, core)
-extern struct snd_vx_ops snd_vxpocket_ops;
+extern const struct snd_vx_ops snd_vxpocket_ops;
void vx_set_mic_boost(struct vx_core *chip, int boost);
void vx_set_mic_level(struct vx_core *chip, int level);