p54: unify ieee80211 device registration

All three drivers (p54pci, p54usb and p54spi) are implementing the
same functionality three times. So, why not put it into the shared library?!

Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/p54/p54common.c b/drivers/net/wireless/p54/p54common.c
index 14438a6..42d1cac 100644
--- a/drivers/net/wireless/p54/p54common.c
+++ b/drivers/net/wireless/p54/p54common.c
@@ -2489,6 +2489,21 @@
 }
 EXPORT_SYMBOL_GPL(p54_init_common);
 
+int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
+{
+	int err;
+
+	err = ieee80211_register_hw(dev);
+	if (err) {
+		dev_err(pdev, "Cannot register device (%d).\n", err);
+		return err;
+	}
+
+	dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy));
+	return 0;
+}
+EXPORT_SYMBOL_GPL(p54_register_common);
+
 void p54_free_common(struct ieee80211_hw *dev)
 {
 	struct p54_common *priv = dev->priv;