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ath5k: keep beacon RSSI average

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Keep an exponentially weighted moving average of the beacon RSSI in our BSS.
It will be used by the ANI implementation.

The averaging algorithm is copied from rt2x00, Thanks :)

Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Bruno Randolf
2010-03-25 14:49:25 +09:00
committed by John W. Linville
parent 6a8a3f6b2a
commit b4ea449df9
2 changed files with 56 additions and 0 deletions
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21
drivers/net/wireless/ath/ath5k/base.c
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@@ -1803,6 +1803,25 @@ ath5k_check_ibss_tsf(struct ath5k_softc *sc, struct sk_buff *skb,
}
}
static void
ath5k_update_beacon_rssi(struct ath5k_softc *sc, struct sk_buff *skb, int rssi)
{
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
struct ath5k_hw *ah = sc->ah;
struct ath_common *common = ath5k_hw_common(ah);
/* only beacons from our BSSID */
if (!ieee80211_is_beacon(mgmt->frame_control) ||
memcmp(mgmt->bssid, common->curbssid, ETH_ALEN) != 0)
return;
ah->ah_beacon_rssi_avg = ath5k_moving_average(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 */
}
/*
* Compute padding position. skb must contains an IEEE 802.11 frame
*/
@@ -2022,6 +2041,8 @@ accept:
ath5k_debug_dump_skb(sc, skb, "RX ", 0);
ath5k_update_beacon_rssi(sc, skb, rs.rs_rssi);
/* check beacons in IBSS mode */
if (sc->opmode == NL80211_IFTYPE_ADHOC)
ath5k_check_ibss_tsf(sc, skb, rxs);