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--- 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;
@@ -2580,6 +2581,7 @@ 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)) {
@@ -2914,6 +2916,40 @@ 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;
+
+ if (!ic->ic_curchan || (ic->ic_curchan == IEEE80211_CHAN_ANYC))
+ return;
+
+ rx = OS_REG_READ(ah, AR5K_RXCLEAR);
+ cc = OS_REG_READ(ah, AR5K_CYCLES);
+ if (!cc)
+ return;
+
+ 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,
@@ -2940,6 +2976,7 @@ 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);
@@ -9022,6 +9059,7 @@ 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
@@ -417,6 +417,19 @@ 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)
{
@@ -451,6 +464,7 @@ pc_cmp(const void *_a, const void *_b)
EVALUATE_CRITERION(radar, a, b);
EVALUATE_CRITERION(keepmode, params, a, b);
+ EVALUATE_CRITERION(idletime, a, b);
EVALUATE_CRITERION(sc, ic, a, b);
/* XXX: rssi useless? pick_channel evaluates it anyway */
EVALUATE_CRITERION(rssi, params->ss->ss_priv, a, b);
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