int (*vidioc_g_frequency) (struct file *file, void *fh,
struct v4l2_frequency *a);
int (*vidioc_s_frequency) (struct file *file, void *fh,
- struct v4l2_frequency *a);
+ const struct v4l2_frequency *a);
int (*vidioc_enum_freq_bands) (struct file *file, void *fh,
struct v4l2_frequency_band *band);