ath9k: Add a module parameter to disable led blinking.

Some vendors require the LED to be ON always irrespective of any
radio activity. Introducing a module parameter to disable blinking,
so that one can choose between always on or led blink during
activity.
Signed-off-by: Vivek Natarajan <vnatarajan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/ath9k.h

@@ -628,6 +628,7 @@ static inline void ath_read_cachesize(struct ath_common *common, int *csz)
 
 extern struct ieee80211_ops ath9k_ops;
 extern int modparam_nohwcrypt;
+extern int led_blink;
 
 irqreturn_t ath_isr(int irq, void *dev);
 int ath9k_init_device(u16 devid, struct ath_softc *sc, u16 subsysid,

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

@@ -76,6 +76,7 @@ static void ath_led_brightness(struct led_classdev *led_cdev,
 	case LED_FULL:
 		if (led->led_type == ATH_LED_ASSOC) {
 			sc->sc_flags |= SC_OP_LED_ASSOCIATED;
+			if (led_blink)
 				ieee80211_queue_delayed_work(sc->hw,
 						     &sc->ath_led_blink_work, 0);
 		} else if (led->led_type == ATH_LED_RADIO) {
@@ -143,6 +144,7 @@ void ath_init_leds(struct ath_softc *sc)
 	/* LED off, active low */
 	ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1);
 
+	if (led_blink)
 		INIT_DELAYED_WORK(&sc->ath_led_blink_work, ath_led_blink_work);
 
 	trigger = ieee80211_get_radio_led_name(sc->hw);
@@ -180,6 +182,7 @@ void ath_init_leds(struct ath_softc *sc)
 	return;
 
 fail:
+	if (led_blink)
 		cancel_delayed_work_sync(&sc->ath_led_blink_work);
 	ath_deinit_leds(sc);
 }

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

@@ -33,6 +33,10 @@ int modparam_nohwcrypt;
 module_param_named(nohwcrypt, modparam_nohwcrypt, int, 0444);
 MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption");
 
+int led_blink = 1;
+module_param_named(blink, led_blink, int, 0444);
+MODULE_PARM_DESC(blink, "Enable LED blink on activity");
+
 /* We use the hw_value as an index into our private channel structure */
 
 #define CHAN2G(_freq, _idx)  { \

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

@@ -1241,7 +1241,9 @@ static void ath9k_stop(struct ieee80211_hw *hw)
 
 	aphy->state = ATH_WIPHY_INACTIVE;
 
+	if (led_blink)
 		cancel_delayed_work_sync(&sc->ath_led_blink_work);
+
 	cancel_delayed_work_sync(&sc->tx_complete_work);
 	cancel_work_sync(&sc->paprd_work);