rtl8180: add software-based support for IBSS mode

Device documentation suggests that hardware support for beaconing
is available.  But I implemented software-based beacon generation
as an experiment and it seems better to have that working now rather
than waiting for something better to materialize.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rtl818x/rtl8180.h b/drivers/net/wireless/rtl818x/rtl8180.h
index b92d678..4baf0cf 100644
--- a/drivers/net/wireless/rtl818x/rtl8180.h
+++ b/drivers/net/wireless/rtl818x/rtl8180.h
@@ -55,6 +55,14 @@
 	struct sk_buff_head queue;
 };
 
+struct rtl8180_vif {
+	struct ieee80211_hw *dev;
+
+	/* beaconing */
+	struct delayed_work beacon_work;
+	bool enable_beacon;
+};
+
 struct rtl8180_priv {
 	/* common between rtl818x drivers */
 	struct rtl818x_csr __iomem *map;