ath9k: enable ANI to help with noisy environments

This enables Adaptive Noise Immunity (ANI) on ath9k.
ANI is as algorithm designed to minimize the detrimental
effects of time-varying interferences. This should
help with throughput in noisy environments. To use
ANI we re-enable the MIB interrupt. Since ANI works
on a timer and updates the noise floor we take
advantage of this and also report a non-static noise
floor now to mac80211.

Signed-off-by: Sujith Manoharan <Sujith.Manoharan@atheros.com>
Signed-off-by: Jouni Malinen <Jouni.Malinen@Atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath9k/core.h b/drivers/net/wireless/ath9k/core.h
index 5b4f1c48a618..cb3e61e57c4d 100644
--- a/drivers/net/wireless/ath9k/core.h
+++ b/drivers/net/wireless/ath9k/core.h
@@ -800,6 +800,28 @@ void ath_slow_ant_div(struct ath_antdiv *antdiv,
 		      struct ath_rx_status *rx_stats);
 void ath_setdefantenna(void *sc, u32 antenna);
 
+/*******/
+/* ANI */
+/*******/
+
+/* ANI values for STA only.
+   FIXME: Add appropriate values for AP later */
+
+#define ATH_ANI_POLLINTERVAL    100     /* 100 milliseconds between ANI poll */
+#define ATH_SHORT_CALINTERVAL   1000    /* 1 second between calibrations */
+#define ATH_LONG_CALINTERVAL    30000   /* 30 seconds between calibrations */
+#define ATH_RESTART_CALINTERVAL 1200000 /* 20 minutes between calibrations */
+
+struct ath_ani {
+	bool sc_caldone;
+	int16_t sc_noise_floor;
+	unsigned int sc_longcal_timer;
+	unsigned int sc_shortcal_timer;
+	unsigned int sc_resetcal_timer;
+	unsigned int sc_checkani_timer;
+	struct timer_list timer;
+};
+
 /********************/
 /*   LED Control    */
 /********************/
@@ -1028,6 +1050,9 @@ struct ath_softc {
 
 	/* Rfkill */
 	struct ath_rfkill rf_kill;
+
+	/* ANI */
+	struct ath_ani sc_ani;
 };
 
 int ath_init(u16 devid, struct ath_softc *sc);