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Subject[PATCH v8 2/3] ath5k: Use generic EWMA library
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Date
Remove ath5k's private moving average implementation in favour of the generic
library version.

Signed-off-by: Bruno Randolf <br1@einfach.org>
---
drivers/net/wireless/ath/ath5k/Kconfig | 1 +
drivers/net/wireless/ath/ath5k/ani.c | 4 ++--
drivers/net/wireless/ath/ath5k/ath5k.h | 26 ++------------------------
drivers/net/wireless/ath/ath5k/base.c | 4 ++--
drivers/net/wireless/ath/ath5k/debug.c | 2 +-
5 files changed, 8 insertions(+), 29 deletions(-)
diff --git a/drivers/net/wireless/ath/ath5k/Kconfig b/drivers/net/wireless/ath/ath5k/Kconfig
index eb83b7b..4784457 100644
--- a/drivers/net/wireless/ath/ath5k/Kconfig
+++ b/drivers/net/wireless/ath/ath5k/Kconfig
@@ -4,6 +4,7 @@ config ATH5K
select MAC80211_LEDS
select LEDS_CLASS
select NEW_LEDS
+ select AVERAGE
---help---
This module adds support for wireless adapters based on
Atheros 5xxx chipset.
diff --git a/drivers/net/wireless/ath/ath5k/ani.c b/drivers/net/wireless/ath/ath5k/ani.c
index f141919..db98a85 100644
--- a/drivers/net/wireless/ath/ath5k/ani.c
+++ b/drivers/net/wireless/ath/ath5k/ani.c
@@ -216,7 +216,7 @@ static void
ath5k_ani_raise_immunity(struct ath5k_hw *ah, struct ath5k_ani_state *as,
bool ofdm_trigger)
{
- int rssi = ah->ah_beacon_rssi_avg.avg;
+ int rssi = ewma_read(&ah->ah_beacon_rssi_avg);

ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "raise immunity (%s)",
ofdm_trigger ? "ODFM" : "CCK");
@@ -301,7 +301,7 @@ ath5k_ani_raise_immunity(struct ath5k_hw *ah, struct ath5k_ani_state *as,
static void
ath5k_ani_lower_immunity(struct ath5k_hw *ah, struct ath5k_ani_state *as)
{
- int rssi = ah->ah_beacon_rssi_avg.avg;
+ int rssi = ewma_read(&ah->ah_beacon_rssi_avg);

ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "lower immunity");

diff --git a/drivers/net/wireless/ath/ath5k/ath5k.h b/drivers/net/wireless/ath/ath5k/ath5k.h
index 308b79e..2718136 100644
--- a/drivers/net/wireless/ath/ath5k/ath5k.h
+++ b/drivers/net/wireless/ath/ath5k/ath5k.h
@@ -25,6 +25,7 @@

#include <linux/io.h>
#include <linux/types.h>
+#include <linux/average.h>
#include <net/mac80211.h>

/* RX/TX descriptor hw structs
@@ -1102,7 +1103,7 @@ struct ath5k_hw {
struct ath5k_nfcal_hist ah_nfcal_hist;

/* average beacon RSSI in our BSS (used by ANI) */
- struct ath5k_avg_val ah_beacon_rssi_avg;
+ struct ewma ah_beacon_rssi_avg;

/* noise floor from last periodic calibration */
s32 ah_noise_floor;
@@ -1315,27 +1316,4 @@ static inline u32 ath5k_hw_bitswap(u32 val, unsigned int bits)
return retval;
}

-#define AVG_SAMPLES 8
-#define AVG_FACTOR 1000
-
-/**
- * ath5k_moving_average - Exponentially weighted moving average
- * @avg: average structure
- * @val: current value
- *
- * This implementation make use of a struct ath5k_avg_val to prevent rounding
- * errors.
- */
-static inline struct ath5k_avg_val
-ath5k_moving_average(const struct ath5k_avg_val avg, const int val)
-{
- struct ath5k_avg_val new;
- new.avg_weight = avg.avg_weight ?
- (((avg.avg_weight * ((AVG_SAMPLES) - 1)) +
- (val * (AVG_FACTOR))) / (AVG_SAMPLES)) :
- (val * (AVG_FACTOR));
- new.avg = new.avg_weight / (AVG_FACTOR);
- return new;
-}
-
#endif
diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c
index 4d21202..ae069b7 100644
--- a/drivers/net/wireless/ath/ath5k/base.c
+++ b/drivers/net/wireless/ath/ath5k/base.c
@@ -1307,8 +1307,7 @@ ath5k_update_beacon_rssi(struct ath5k_softc *sc, struct sk_buff *skb, int rssi)
memcmp(mgmt->bssid, common->curbssid, ETH_ALEN) != 0)
return;

- ah->ah_beacon_rssi_avg = ath5k_moving_average(ah->ah_beacon_rssi_avg,
- rssi);
+ ewma_add(&ah->ah_beacon_rssi_avg, rssi);

/* in IBSS mode we should keep RSSI statistics per neighbour */
/* le16_to_cpu(mgmt->u.beacon.capab_info) & WLAN_CAPABILITY_IBSS */
@@ -2562,6 +2561,7 @@ ath5k_reset(struct ath5k_softc *sc, struct ieee80211_channel *chan)
ah->ah_cal_next_full = jiffies;
ah->ah_cal_next_ani = jiffies;
ah->ah_cal_next_nf = jiffies;
+ ewma_init(&ah->ah_beacon_rssi_avg, 1000, 8);

/*
* Change channels and update the h/w rate map if we're switching;
diff --git a/drivers/net/wireless/ath/ath5k/debug.c b/drivers/net/wireless/ath/ath5k/debug.c
index 54dcf77..7d785cb 100644
--- a/drivers/net/wireless/ath/ath5k/debug.c
+++ b/drivers/net/wireless/ath/ath5k/debug.c
@@ -719,7 +719,7 @@ static ssize_t read_file_ani(struct file *file, char __user *user_buf,
st->mib_intr);
len += snprintf(buf+len, sizeof(buf)-len,
"beacon RSSI average:\t%d\n",
- sc->ah->ah_beacon_rssi_avg.avg);
+ (int)ewma_read(&sc->ah->ah_beacon_rssi_avg));

#define CC_PRINT(_struct, _field) \
_struct._field, \


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