mac80211: add blink api backport

This patch was copied from a more recent backports versions. This fixes
a build problem with kernel < 3.6.

This closes #14475

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

SVN-Revision: 38833

package/kernel/mac80211/patches/070-mac80211-led-blink-api.patch

@@ -0,0 +1,65 @@
+backports: use old led api on old kernel versions.
+
+Usage of a new led api was introduced in mac80211, this patch make
+backports use the old api on older kernel versions. This could cause a
+problem with the led, the transmit led could stay on if nothing is
+transfered.
+
+This backports the following upstream commit:
+commit e47f2509e5f182f4df144406de6f2bc78179d57e
+Author: Fabio Baltieri <fabio.baltieri@gmail.com>
+Date:   Thu Jul 25 12:00:26 2013 +0200
+
+    mac80211: use oneshot blink API for LED triggers
+
+--- a/net/mac80211/ieee80211_i.h
++++ b/net/mac80211/ieee80211_i.h
+@@ -1122,6 +1122,9 @@ struct ieee80211_local {
+ 	u32 dot11TransmittedFrameCount;
+ 
+ #ifdef CPTCFG_MAC80211_LEDS
++#if LINUX_VERSION_CODE < KERNEL_VERSION(3,6,0)
++	int tx_led_counter, rx_led_counter;
++#endif
+ 	struct led_trigger *tx_led, *rx_led, *assoc_led, *radio_led;
+ 	struct tpt_led_trigger *tpt_led_trigger;
+ 	char tx_led_name[32], rx_led_name[32],
+--- a/net/mac80211/led.c
++++ b/net/mac80211/led.c
+@@ -16,18 +16,36 @@
+ 
+ void ieee80211_led_rx(struct ieee80211_local *local)
+ {
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0)
+ 	unsigned long led_delay = MAC80211_BLINK_DELAY;
++#endif
+ 	if (unlikely(!local->rx_led))
+ 		return;
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0)
+ 	led_trigger_blink_oneshot(local->rx_led, &led_delay, &led_delay, 0);
++#else
++	if (local->rx_led_counter++ % 2 == 0)
++		led_trigger_event(local->rx_led, LED_OFF);
++	else
++		led_trigger_event(local->rx_led, LED_FULL);
++#endif
+ }
+ 
+ void ieee80211_led_tx(struct ieee80211_local *local)
+ {
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0)
+ 	unsigned long led_delay = MAC80211_BLINK_DELAY;
++#endif
+ 	if (unlikely(!local->tx_led))
+ 		return;
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0)
+ 	led_trigger_blink_oneshot(local->tx_led, &led_delay, &led_delay, 0);
++#else
++	if (local->tx_led_counter++ % 2 == 0)
++		led_trigger_event(local->tx_led, LED_OFF);
++	else
++		led_trigger_event(local->tx_led, LED_FULL);
++#endif
+ }
+ 
+ void ieee80211_led_assoc(struct ieee80211_local *local, bool associated)