ath5k: Adaptive Noise Immunity (ANI) Implementation

This is an Adaptive Noise Imunity (ANI) implementation for ath5k. I have looked
at both ath9k and HAL sources (they are nearly the same), and even though i
have implemented some things differently, the basic algorithm is practically
the same, for now. I hope that this can serve as a clean start to improve the
algorithm later.

This also adds a possibility to manually control ANI settings, right now only
thru a debugfs file:
  * set lowest sensitivity (=highest noise immunity):
	echo sens-low > /sys/kernel/debug/ath5k/phy0/ani
  * set highest sensitivity (=lowest noise immunity):
	echo sens-high > /sys/kernel/debug/ath5k/phy0/ani
  * automatically control immunity (default):
	echo ani-on > /sys/kernel/debug/ath5k/phy0/ani
  * to see the parameters in use and watch them change:
	cat /sys/kernel/debug/ath5k/phy0/ani

Manually setting sensitivity will turn the automatic control off. You can also
control each of the five immunity parameters (noise immunity, spur immunity,
firstep, ofdm weak signal detection, cck weak signal detection) manually thru
the debugfs file.

This is tested on AR5414 and nearly doubles the thruput in a noisy 2GHz band.

Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath5k/base.h b/drivers/net/wireless/ath/ath5k/base.h
index a572a484480..53a5651c57a 100644
--- a/drivers/net/wireless/ath/ath5k/base.h
+++ b/drivers/net/wireless/ath/ath5k/base.h
@@ -50,6 +50,7 @@
 
 #include "ath5k.h"
 #include "debug.h"
+#include "ani.h"
 
 #include "../regd.h"
 #include "../ath.h"
@@ -132,6 +133,8 @@ struct ath5k_statistics {
 	unsigned int rts_ok;
 	unsigned int fcs_error;
 	unsigned int beacons;
+
+	unsigned int mib_intr;
 };
 
 #if CHAN_DEBUG
@@ -221,6 +224,9 @@ struct ath5k_softc {
 	bool			enable_beacon;	/* true if beacons are on */
 
 	struct ath5k_statistics	stats;
+
+	struct ath5k_ani_state	ani_state;
+	struct tasklet_struct	ani_tasklet;	/* ANI calibration */
 };
 
 #define ath5k_hw_hasbssidmask(_ah) \