ath5k: Implement antenna control
* Add code to support the various antenna scenarios supported by hw
* For now hardcode the default scenario (single or dual omnis with
tx/rx diversity working and tx antenna handled by session -hw keeps
track on which antenna it got ack from each ap/station and maps each
ap/station to one of the antennas-).
Signed-off-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c
index 912ffc5..6789c5d 100644
--- a/drivers/net/wireless/ath/ath5k/base.c
+++ b/drivers/net/wireless/ath/ath5k/base.c
@@ -1279,7 +1279,7 @@
ieee80211_get_hdrlen_from_skb(skb), AR5K_PKT_TYPE_NORMAL,
(sc->power_level * 2),
hw_rate,
- info->control.rates[0].count, keyidx, 0, flags,
+ info->control.rates[0].count, keyidx, ah->ah_tx_ant, flags,
cts_rate, duration);
if (ret)
goto err_unmap;
@@ -2009,7 +2009,8 @@
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct ath5k_hw *ah = sc->ah;
struct ath5k_desc *ds;
- int ret, antenna = 0;
+ int ret = 0;
+ u8 antenna;
u32 flags;
bf->skbaddr = pci_map_single(sc->pdev, skb->data, skb->len,
@@ -2023,23 +2024,35 @@
}
ds = bf->desc;
+ antenna = ah->ah_tx_ant;
flags = AR5K_TXDESC_NOACK;
if (sc->opmode == NL80211_IFTYPE_ADHOC && ath5k_hw_hasveol(ah)) {
ds->ds_link = bf->daddr; /* self-linked */
flags |= AR5K_TXDESC_VEOL;
- /*
- * Let hardware handle antenna switching if txantenna is not set
- */
- } else {
+ } else
ds->ds_link = 0;
- /*
- * Switch antenna every 4 beacons if txantenna is not set
- * XXX assumes two antennas
- */
- if (antenna == 0)
- antenna = sc->bsent & 4 ? 2 : 1;
- }
+
+ /*
+ * If we use multiple antennas on AP and use
+ * the Sectored AP scenario, switch antenna every
+ * 4 beacons to make sure everybody hears our AP.
+ * When a client tries to associate, hw will keep
+ * track of the tx antenna to be used for this client
+ * automaticaly, based on ACKed packets.
+ *
+ * Note: AP still listens and transmits RTS on the
+ * default antenna which is supposed to be an omni.
+ *
+ * Note2: On sectored scenarios it's possible to have
+ * multiple antennas (1omni -the default- and 14 sectors)
+ * so if we choose to actually support this mode we need
+ * to allow user to set how many antennas we have and tweak
+ * the code below to send beacons on all of them.
+ */
+ if (ah->ah_ant_mode == AR5K_ANTMODE_SECTOR_AP)
+ antenna = sc->bsent & 4 ? 2 : 1;
+
/* FIXME: If we are in g mode and rate is a CCK rate
* subtract ah->ah_txpower.txp_cck_ofdm_pwr_delta
@@ -2752,12 +2765,16 @@
struct ath5k_softc *sc = hw->priv;
struct ath5k_hw *ah = sc->ah;
struct ieee80211_conf *conf = &hw->conf;
- int ret;
+ int ret = 0;
mutex_lock(&sc->lock);
sc->bintval = conf->beacon_int;
+ ret = ath5k_chan_set(sc, conf->channel);
+ if (ret < 0)
+ return ret;
+
if ((changed & IEEE80211_CONF_CHANGE_POWER) &&
(sc->power_level != conf->power_level)) {
sc->power_level = conf->power_level;
@@ -2766,10 +2783,27 @@
ath5k_hw_set_txpower_limit(ah, (conf->power_level * 2));
}
- ret = ath5k_chan_set(sc, conf->channel);
+ /* TODO:
+ * 1) Move this on config_interface and handle each case
+ * separately eg. when we have only one STA vif, use
+ * AR5K_ANTMODE_SINGLE_AP
+ *
+ * 2) Allow the user to change antenna mode eg. when only
+ * one antenna is present
+ *
+ * 3) Allow the user to set default/tx antenna when possible
+ *
+ * 4) Default mode should handle 90% of the cases, together
+ * with fixed a/b and single AP modes we should be able to
+ * handle 99%. Sectored modes are extreme cases and i still
+ * haven't found a usage for them. If we decide to support them,
+ * then we must allow the user to set how many tx antennas we
+ * have available
+ */
+ ath5k_hw_set_antenna_mode(ah, AR5K_ANTMODE_DEFAULT);
mutex_unlock(&sc->lock);
- return ret;
+ return 0;
}
#define SUPPORTED_FIF_FLAGS \
