which default implementation for drivers/hid/hid-cando.c driver, the driver does not implement neither of '.ioctl' nor '.unlocked_ioctl'

in file: fs/ioctl.c I traced a user space ioctl to the following kernel function, however I am stuck with either:

'filp->f_op->unlocked_ioctl(filp, cmd, arg)'
or
'filp->f_op->ioctl(filp->f_path.dentry->d_inode, filp, cmd, arg)'

------------------
static long vfs_ioctl(struct file *filp, unsigned int cmd,
		      unsigned long arg)
{
	int error = -ENOTTY;

	if (!filp->f_op)
		goto out;

	if (filp->f_op->unlocked_ioctl) {
		error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
		if (error == -ENOIOCTLCMD)
			error = -EINVAL;
		goto out;
	} else if (filp->f_op->ioctl) {
		lock_kernel();
		error = filp->f_op->ioctl(filp->f_path.dentry->d_inode,
					  filp, cmd, arg);
		unlock_kernel();
	}

 out:
	return error;
}
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