ath9k: add DFS support for extension channel

In HT40 modes, pulse events on primary and extension
channel are processed individually. If valid, a pulse
event will be fed into the detector
* for primary frequency, or
* for extension frequency (+/-20MHz based on HT40-mode)
* or both

With that, a 40MHz radar will result in two individual
radar events.

Signed-off-by: Zefir Kurtisi <zefir.kurtisi@neratec.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/ath/ath9k/dfs.c b/drivers/net/wireless/ath/ath9k/dfs.c
index 726271c..e98a9ea 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/dfs.c
+++ b/drivers/net/wireless/ath/ath9k/dfs.c
@@ -126,8 +126,19 @@ ath9k_postprocess_radar_event(struct ath_softc *sc,
        DFS_STAT_INC(sc, pulses_detected);
        return true;
 }
-#undef PRI_CH_RADAR_FOUND
-#undef EXT_CH_RADAR_FOUND
+
+static void
+ath9k_dfs_process_radar_pulse(struct ath_softc *sc, struct pulse_event *pe)
+{
+       struct dfs_pattern_detector *pd = sc->dfs_detector;
+       DFS_STAT_INC(sc, pulses_processed);
+       if (pd == NULL)
+               return;
+       if (!pd->add_pulse(pd, pe))
+               return;
+       DFS_STAT_INC(sc, radar_detected);
+       ieee80211_radar_detected(sc->hw);
+}
 
 /*
  * DFS: check PHY-error for radar pulse and feed the detector
@@ -176,18 +187,21 @@ void ath9k_dfs_process_phyerr(struct ath_softc *sc, void *data,
        ard.pulse_length_pri = vdata_end[-3];
        pe.freq = ah->curchan->channel;
        pe.ts = mactime;
-       if (ath9k_postprocess_radar_event(sc, &ard, &pe)) {
-               struct dfs_pattern_detector *pd = sc->dfs_detector;
-               ath_dbg(common, DFS,
-                       "ath9k_dfs_process_phyerr: channel=%d, ts=%llu, "
-                       "width=%d, rssi=%d, delta_ts=%llu\n",
-                       pe.freq, pe.ts, pe.width, pe.rssi,
-                       pe.ts - sc->dfs_prev_pulse_ts);
-               sc->dfs_prev_pulse_ts = pe.ts;
-               DFS_STAT_INC(sc, pulses_processed);
-               if (pd != NULL && pd->add_pulse(pd, &pe)) {
-                       DFS_STAT_INC(sc, radar_detected);
-                       ieee80211_radar_detected(sc->hw);
-               }
+       if (!ath9k_postprocess_radar_event(sc, &ard, &pe))
+               return;
+
+       ath_dbg(common, DFS,
+               "ath9k_dfs_process_phyerr: type=%d, freq=%d, ts=%llu, "
+               "width=%d, rssi=%d, delta_ts=%llu\n",
+               ard.pulse_bw_info, pe.freq, pe.ts, pe.width, pe.rssi,
+               pe.ts - sc->dfs_prev_pulse_ts);
+       sc->dfs_prev_pulse_ts = pe.ts;
+       if (ard.pulse_bw_info & PRI_CH_RADAR_FOUND)
+               ath9k_dfs_process_radar_pulse(sc, &pe);
+       if (ard.pulse_bw_info & EXT_CH_RADAR_FOUND) {
+               pe.freq += IS_CHAN_HT40PLUS(ah->curchan) ? 20 : -20;
+               ath9k_dfs_process_radar_pulse(sc, &pe);
        }
 }
+#undef PRI_CH_RADAR_FOUND
+#undef EXT_CH_RADAR_FOUND