struct mxl111sf_demod_state {
        struct mxl111sf_state *mxl_state;
 
-       struct mxl111sf_demod_config *cfg;
+       const struct mxl111sf_demod_config *cfg;
 
        struct dvb_frontend fe;
 };
 };
 
 struct dvb_frontend *mxl111sf_demod_attach(struct mxl111sf_state *mxl_state,
-                                          struct mxl111sf_demod_config *cfg)
+                                  const struct mxl111sf_demod_config *cfg)
 {
        struct mxl111sf_demod_state *state = NULL;
 
 
 #if IS_ENABLED(CONFIG_DVB_USB_MXL111SF)
 extern
 struct dvb_frontend *mxl111sf_demod_attach(struct mxl111sf_state *mxl_state,
-                                          struct mxl111sf_demod_config *cfg);
+                                  const struct mxl111sf_demod_config *cfg);
 #else
 static inline
 struct dvb_frontend *mxl111sf_demod_attach(struct mxl111sf_state *mxl_state,
-                                          struct mxl111sf_demod_config *cfg)
+                                  const struct mxl111sf_demod_config *cfg)
 {
        printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
        return NULL;
 
        return ret;
 }
 
-static struct mxl111sf_demod_config mxl_demod_config = {
+static const struct mxl111sf_demod_config mxl_demod_config = {
        .read_reg        = mxl111sf_read_reg,
        .write_reg       = mxl111sf_write_reg,
        .program_regs    = mxl111sf_ctrl_program_regs,