+--- a/ath/if_ath.c
++++ b/ath/if_ath.c
+@@ -384,6 +384,7 @@ static u_int32_t ath_get_real_maxtxpower
+
+ static void ath_poll_disable(struct net_device *dev);
+ static void ath_poll_enable(struct net_device *dev);
++static void ath_fetch_idle_time(struct ath_softc *sc);
+
+ /* calibrate every 30 secs in steady state but check every second at first. */
+ static int ath_calinterval = ATH_SHORT_CALINTERVAL;
+@@ -2579,6 +2580,7 @@ ath_init(struct net_device *dev)
+ * be followed by initialization of the appropriate bits
+ * and then setup of the interrupt mask.
+ */
++ ath_fetch_idle_time(sc);
+ sc->sc_curchan.channel = ic->ic_curchan->ic_freq;
+ sc->sc_curchan.channelFlags = ath_chan2flags(ic->ic_curchan);
+ if (!ath_hal_reset(ah, sc->sc_opmode, &sc->sc_curchan, AH_FALSE, &status)) {
+@@ -2913,6 +2915,34 @@ ath_hw_check_atim(struct ath_softc *sc,
+ }
+
+
++#define AR5K_RXCLEAR 0x80f4
++#define AR5K_CYCLES 0x80f8
++static void
++ath_fetch_idle_time(struct ath_softc *sc)
++{
++ struct ieee80211com *ic = &sc->sc_ic;
++ struct ath_hal *ah = sc->sc_ah;
++ u_int32_t cc, rx;
++ u_int32_t time = 0;
++
++ if (sc->sc_ah->ah_macType < 5212)
++ return;
++
++ rx = OS_REG_READ(ah, AR5K_RXCLEAR);
++ cc = OS_REG_READ(ah, AR5K_CYCLES);
++ if (rx > cc)
++ return; /* wraparound */
++
++ if (sc->sc_last_chan)
++ sc->sc_last_chan->ic_idletime = 100 * (cc - rx) / cc;
++ sc->sc_last_chan = ic->ic_curchan;
++
++ OS_REG_WRITE(ah, AR5K_RXCLEAR, 0);
++ OS_REG_WRITE(ah, AR5K_CYCLES, 0);
++}
++#undef AR5K_RXCLEAR
++#undef AR5K_CYCLES
++
+ /*
+ * Reset the hardware w/o losing operational state. This is
+ * basically a more efficient way of doing ath_stop, ath_init,
+@@ -2939,6 +2969,7 @@ ath_reset(struct net_device *dev)
+ * Convert to a HAL channel description with the flags
+ * constrained to reflect the current operating mode.
+ */
++ ath_fetch_idle_time(sc);
+ c = ic->ic_curchan;
+ sc->sc_curchan.channel = c->ic_freq;
+ sc->sc_curchan.channelFlags = ath_chan2flags(c);
+@@ -9019,6 +9050,7 @@ ath_chan_set(struct ath_softc *sc, struc
+ u_int8_t channel_change_required = 0;
+ struct timeval tv;
+
++ ath_fetch_idle_time(sc);
+ /*
+ * Convert to a HAL channel description with
+ * the flags constrained to reflect the current
+--- a/ath/if_athvar.h
++++ b/ath/if_athvar.h
+@@ -773,6 +773,7 @@ struct ath_softc {
+ struct ieee80211vap **sc_bslot; /* beacon xmit slots */
+ int sc_bnext; /* next slot for beacon xmit */
+
++ struct ieee80211_channel *sc_last_chan;
+ int sc_beacon_cal; /* use beacon timer for calibration */
+ u_int64_t sc_lastcal; /* last time the calibration was performed */
+ struct timer_list sc_cal_ch; /* calibration timer */
+--- a/net80211/_ieee80211.h
++++ b/net80211/_ieee80211.h
+@@ -148,6 +148,7 @@ struct ieee80211_channel {
+ int8_t ic_maxpower; /* maximum tx power in dBm */
+ int8_t ic_minpower; /* minimum tx power in dBm */
+ u_int8_t ic_scanflags;
++ u_int8_t ic_idletime; /* phy idle time in % */
+ };
+
+ #define IEEE80211_CHAN_MAX 255
+--- a/net80211/ieee80211_scan_ap.c
++++ b/net80211/ieee80211_scan_ap.c
+@@ -423,6 +423,19 @@ pc_cmp_rssi(struct ap_state *as, struct
+
+ /* This function must be invoked with locks acquired */
+ static int
++pc_cmp_idletime(struct ieee80211_channel *a,
++ struct ieee80211_channel *b)
++{
++ if (!a->ic_idletime || !b->ic_idletime)
++ return 0;
++
++ /* a is better than b (return < 0) when a has more idle time than b */
++ return b->ic_idletime - a->ic_idletime;
++}
++
++
++/* This function must be invoked with locks acquired */
++static int
+ pc_cmp_samechan(struct ieee80211com *ic, struct ieee80211_channel *a,
+ struct ieee80211_channel *b)
+ {
+@@ -455,6 +468,7 @@ pc_cmp(const void *_a, const void *_b)
+ return res; \
+ } while (0)
+
++ EVALUATE_CRITERION(idletime, a, b);
+ EVALUATE_CRITERION(radar, a, b);
+ EVALUATE_CRITERION(keepmode, params, a, b);
+ EVALUATE_CRITERION(sc, ic, a, b);
projects / openwrt / svn-archive / archive.git / commitdiff