ath9k: Determine btcoex scheme type based on chip version

Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/btcoex.h b/drivers/net/wireless/ath/ath9k/btcoex.h
index c80492b..cdfa80d 100644
--- a/drivers/net/wireless/ath/ath9k/btcoex.h
+++ b/drivers/net/wireless/ath/ath9k/btcoex.h
@@ -20,7 +20,14 @@
 #define ATH_WLANACTIVE_GPIO	5
 #define ATH_BTACTIVE_GPIO	6
 
+enum ath_btcoex_scheme {
+	ATH_BTCOEX_CFG_NONE,
+	ATH_BTCOEX_CFG_2WIRE,
+	ATH_BTCOEX_CFG_3WIRE,
+};
+
 struct ath_btcoex_info {
+	enum ath_btcoex_scheme btcoex_scheme;
 	u8 wlanactive_gpio;
 	u8 btactive_gpio;
 };