int si470x_set_freq(struct si470x_device *radio, unsigned int freq);
int si470x_start(struct si470x_device *radio);
int si470x_stop(struct si470x_device *radio);
-int si470x_rds_on(struct si470x_device *radio);
int si470x_fops_open(struct file *file);
int si470x_fops_release(struct file *file);
int si470x_vidioc_querycap(struct file *file, void *priv,