struct mxl111sf_tuner_state {
        struct mxl111sf_state *mxl_state;
 
-       struct mxl111sf_tuner_config *cfg;
+       const struct mxl111sf_tuner_config *cfg;
 
        enum mxl_if_freq if_freq;
 
 };
 
 struct dvb_frontend *mxl111sf_tuner_attach(struct dvb_frontend *fe,
-                                          struct mxl111sf_state *mxl_state,
-                                          struct mxl111sf_tuner_config *cfg)
+                               struct mxl111sf_state *mxl_state,
+                               const struct mxl111sf_tuner_config *cfg)
 {
        struct mxl111sf_tuner_state *state = NULL;
 
 
 #if IS_ENABLED(CONFIG_DVB_USB_MXL111SF)
 extern
 struct dvb_frontend *mxl111sf_tuner_attach(struct dvb_frontend *fe,
-                                          struct mxl111sf_state *mxl_state,
-                                          struct mxl111sf_tuner_config *cfg);
+                               struct mxl111sf_state *mxl_state,
+                               const struct mxl111sf_tuner_config *cfg);
 #else
 static inline
 struct dvb_frontend *mxl111sf_tuner_attach(struct dvb_frontend *fe,
-                                          struct mxl111sf_state *mxl_state,
-                                          struct mxl111sf_tuner_config *cfg)
+                               struct mxl111sf_state *mxl_state,
+                               const struct mxl111sf_tuner_config *cfg)
 {
        printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
        return NULL;
 
        return 0;
 }
 
-static struct mxl111sf_tuner_config mxl_tuner_config = {
+static const struct mxl111sf_tuner_config mxl_tuner_config = {
        .if_freq         = MXL_IF_6_0, /* applies to external IF output, only */
        .invert_spectrum = 0,
        .read_reg        = mxl111sf_read_reg,