On Sat, May 25, 2019 at 12:37:17PM +0100, Dragan Cvetic wrote:

quoted

+static int xsdfec_dev_open(struct inode *iptr, struct file *fptr)
+{
+	return 0;
+}
+
+static int xsdfec_dev_release(struct inode *iptr, struct file *fptr)
+{
+	return 0;
+}

empty open/close functions are never needed, just drop them.

open() is needed to allocate file descriptor eg.
fd = open(dev_name, O_RDWR);

Please, advise if you have some other idea in mind

Thanks
Dragan