ath9k: Add a module parameter to enable diversity

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath.h

@@ -159,6 +159,7 @@ struct ath_common {
 
 	bool btcoex_enabled;
 	bool disable_ani;
+	bool antenna_diversity;
 };
 
 struct sk_buff *ath_rxbuf_alloc(struct ath_common *common,

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

@@ -776,6 +776,7 @@ div_comb_done:
 void ath_ant_comb_update(struct ath_softc *sc)
 {
 	struct ath_hw *ah = sc->sc_ah;
+	struct ath_common *common = ath9k_hw_common(ah);
 	struct ath_hw_antcomb_conf div_ant_conf;
 	u8 lna_conf;
 
@@ -790,4 +791,7 @@ void ath_ant_comb_update(struct ath_softc *sc)
 	div_ant_conf.alt_lna_conf = lna_conf;
 
 	ath9k_hw_antdiv_comb_conf_set(ah, &div_ant_conf);
+
+	if (common->antenna_diversity)
+		ath9k_hw_antctrl_shared_chain_lnadiv(ah, true);
 }

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

@@ -46,6 +46,10 @@ static int ath9k_btcoex_enable;
 module_param_named(btcoex_enable, ath9k_btcoex_enable, int, 0444);
 MODULE_PARM_DESC(btcoex_enable, "Enable wifi-BT coexistence");
 
+static int ath9k_enable_diversity;
+module_param_named(enable_diversity, ath9k_enable_diversity, int, 0444);
+MODULE_PARM_DESC(enable_diversity, "Enable Antenna diversity for AR9565");
+
 bool is_ath9k_unloaded;
 /* We use the hw_value as an index into our private channel structure */
 
@@ -546,6 +550,14 @@ static int ath9k_init_softc(u16 devid, struct ath_softc *sc,
 	common->debug_mask = ath9k_debug;
 	common->btcoex_enabled = ath9k_btcoex_enable == 1;
 	common->disable_ani = false;
+
+	/*
+	 * Enable Antenna diversity only when BTCOEX is disabled
+	 * and the user manually requests the feature.
+	 */
+	if (!common->btcoex_enabled && ath9k_enable_diversity)
+		common->antenna_diversity = 1;
+
 	spin_lock_init(&common->cc_lock);
 
 	spin_lock_init(&sc->sc_serial_rw);