int pcf8563_open(struct inode *, struct file *);
int pcf8563_release(struct inode *, struct file *);
-static struct file_operations pcf8563_fops = {
+static const struct file_operations pcf8563_fops = {
owner: THIS_MODULE,
ioctl: pcf8563_ioctl,
open: pcf8563_open,