wr_nic: define weak mezzanine functions (for spec)

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

kernel/wr_nic/device.c

@@ -42,6 +42,7 @@ static int wrn_remove(struct platform_device *pdev)
 	/* Then remove devices, memory maps, interrupts */
 	for (i = 0; i < WRN_NR_ENDPOINTS; i++) {
 		if (wrn->dev[i]) {
+			wrn_mezzanine_exit(wrn->dev[i]);
 			wrn_endpoint_remove(wrn->dev[i]);
 			free_netdev(wrn->dev[i]);
 			wrn->dev[i] = NULL;
@@ -168,7 +169,13 @@ static int __devinit wrn_probe(struct platform_device *pdev)
 			goto out;
 		/* This endpoint went in properly */
 		wrn->dev[i] = netdev;
+		err = wrn_mezzanine_init(netdev);
+		if (err)
+			dev_err(&pdev->dev, "Init mezzanine code: "
+				"error %i\n", err);
 	}
+	if (i == 0)
+		return -ENODEV; /* no endpoints */
 
 	for (i = 0; i < WRN_NR_TXDESC; i++) { /* Clear all tx descriptors */
 		struct wrn_txd *tx;

kernel/wr_nic/nic-core.c

@@ -264,6 +264,27 @@ struct net_device_stats *wrn_get_stats(struct net_device *dev)
 	return NULL;
 }
 
+/*
+ * If we have a mezzanine, we need the ioctl as well as init/exit. Provide
+ * three weak functions here, so to link even if no mezzanine is there.
+ */
+int __weak wrn_mezzanine_ioctl(struct net_device *dev, struct ifreq *rq,
+			       int cmd)
+{
+	return -ENOIOCTLCMD;
+}
+
+int __weak wrn_mezzanine_init(struct net_device *dev)
+{
+	return 0;
+}
+
+void __weak wrn_mezzanine_exit(struct net_device *dev)
+{
+	return;
+}
+
+
 static int wrn_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 {
 	struct wrn_ep *ep = netdev_priv(dev);
@@ -300,6 +321,11 @@ static int wrn_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 			return -EFAULT;
 		return 0;
 
+	case PRIV_MEZZANINE_ID:
+	case PRIV_MEZZANINE_CMD:
+		/* Pass this to the mezzanine driver, or use internal weak */
+		return wrn_mezzanine_ioctl(dev, rq, cmd);
+
 	default:
 		spin_lock_irq(&ep->lock);
 		res = generic_mii_ioctl(&ep->mii, if_mii(rq), cmd, NULL);