kernel: add wr-nic-dio with mezzanine ioctl, currently empty

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

kernel/Makefile

@@ -21,6 +21,7 @@ spec-$(CONFIG_GPIOLIB) += spec-gpio.o
 
 wr-nic-y = wr-nic-core.o
 wr-nic-y += wr-nic-eth.o
+wr-nic-y += wr-nic-dio.o
 wr-nic-y += wr_nic/device.o
 wr-nic-y += wr_nic/endpoint.o
 wr-nic-y += wr_nic/ethtool.o

kernel/wr-nic-dio.c

+/*
+ * Copyright (C) 2012 CERN (www.cern.ch)
+ * Author: Alessandro Rubini <rubini@gnudd.com>
+ *
+ * Released according to the GNU GPL, version 2 or any later version.
+ *
+ * This work is part of the White Rabbit project, a research effort led
+ * by CERN, the European Institute for Nuclear Research.
+ */
+#include <linux/module.h>
+#include <linux/fmc.h>
+#include <linux/fmc-sdb.h>
+#include "spec.h"
+#include "spec-nic.h"
+#include "wr_nic/wr-nic.h"
+
+int wrn_mezzanine_ioctl(struct net_device *dev, struct ifreq *rq,
+			       int cmd)
+{
+	return -EAGAIN;
+}