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>

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;
 };

drivers/net/wireless/ath/ath9k/hw.c

@@ -3489,6 +3489,7 @@ void ath9k_hw_fill_cap_info(struct ath_hw *ah)
 {
 	struct ath9k_hw_capabilities *pCap = &ah->caps;
 	struct ath_regulatory *regulatory = ath9k_hw_regulatory(ah);
+	struct ath_btcoex_info *btcoex_info = &ah->ah_sc->btcoex_info;
 
 	u16 capField = 0, eeval;
 
@@ -3666,8 +3667,15 @@ void ath9k_hw_fill_cap_info(struct ath_hw *ah)
 
 	if (AR_SREV_9280_10_OR_LATER(ah) && btcoex_enable) {
 		pCap->hw_caps |= ATH9K_HW_CAP_BT_COEX;
-		ah->ah_sc->btcoex_info.btactive_gpio = ATH_BTACTIVE_GPIO;
-		ah->ah_sc->btcoex_info.wlanactive_gpio = ATH_WLANACTIVE_GPIO;
+		btcoex_info->btactive_gpio = ATH_BTACTIVE_GPIO;
+		btcoex_info->wlanactive_gpio = ATH_WLANACTIVE_GPIO;
+
+		if (AR_SREV_9285(ah))
+			btcoex_info->btcoex_scheme = ATH_BTCOEX_CFG_3WIRE;
+		else
+			btcoex_info->btcoex_scheme = ATH_BTCOEX_CFG_2WIRE;
+	} else {
+		btcoex_info->btcoex_scheme = ATH_BTCOEX_CFG_NONE;
 	}
 }
 

drivers/net/wireless/ath/ath9k/main.c

@@ -1509,7 +1509,8 @@ static int ath_init_softc(u16 devid, struct ath_softc *sc)
 			ARRAY_SIZE(ath9k_5ghz_chantable);
 	}
 
-	if (ah->caps.hw_caps & ATH9K_HW_CAP_BT_COEX)
+	if ((ah->caps.hw_caps & ATH9K_HW_CAP_BT_COEX) &&
+	    (sc->btcoex_info.btcoex_scheme == ATH_BTCOEX_CFG_2WIRE))
 		ath9k_hw_btcoex_init(ah);
 
 	return 0;
@@ -1993,6 +1994,7 @@ static int ath9k_start(struct ieee80211_hw *hw)
 	ieee80211_queue_delayed_work(sc->hw, &sc->tx_complete_work, 0);
 
 	if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_BT_COEX) &&
+	    (sc->btcoex_info.btcoex_scheme == ATH_BTCOEX_CFG_2WIRE) &&
 	    !(sc->sc_flags & SC_OP_BTCOEX_ENABLED))
 		ath9k_hw_btcoex_enable(sc->sc_ah);