text: /*
   * Copyright (c) 2008-2011 Atheros Communications Inc.
   *
   * Permission to use, copy, modify, and/or distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <linux/nl80211.h>
  #include <linux/delay.h>
  #include "ath9k.h"
  #include "btcoex.h"
  
  u8 ath9k_parse_mpdudensity(u8 mpdudensity)
  {
  	/*
  	 * 802.11n D2.0 defined values for "Minimum MPDU Start Spacing":
  	 *   0 for no restriction
  	 *   1 for 1/4 us
  	 *   2 for 1/2 us
  	 *   3 for 1 us
  	 *   4 for 2 us
  	 *   5 for 4 us
  	 *   6 for 8 us
  	 *   7 for 16 us
  	 */
  	switch (mpdudensity) {
  	case 0:
  		return 0;
  	case 1:
  	case 2:
  	case 3:
  		/* Our lower layer calculations limit our precision to
  		   1 microsecond */
  		return 1;
  	case 4:
  		return 2;
  	case 5:
  		return 4;
  	case 6:
  		return 8;
  	case 7:
  		return 16;
  	default:
  		return 0;
  	}
  }
  
  static bool ath9k_has_pending_frames(struct ath_softc *sc, struct ath_txq *txq,
  				     bool sw_pending)
  {
  	bool pending = false;
  
  	spin_lock_bh(&txq->axq_lock);
  
  	if (txq->axq_depth) {
  		pending = true;
  		goto out;
  	}
  
  	if (!sw_pending)
  		goto out;
  
  	if (txq->mac80211_qnum >= 0) {
  		struct list_head *list;
  
  		list = &sc->cur_chan->acq[txq->mac80211_qnum];
  		if (!list_empty(list))
  			pending = true;
  	}
  out:
  	spin_unlock_bh(&txq->axq_lock);
  	return pending;
  }
  
  static bool ath9k_setpower(struct ath_softc *sc, enum ath9k_power_mode mode)
  {
  	unsigned long flags;
  	bool ret;
  
  	spin_lock_irqsave(&sc->sc_pm_lock, flags);
  	ret = ath9k_hw_setpower(sc->sc_ah, mode);
  	spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
  
  	return ret;
  }
  
  void ath_ps_full_sleep(unsigned long data)
  {
  	struct ath_softc *sc = (struct ath_softc *) data;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	bool reset;
  
  	spin_lock(&common->cc_lock);
  	ath_hw_cycle_counters_update(common);
  	spin_unlock(&common->cc_lock);
  
  	ath9k_hw_setrxabort(sc->sc_ah, 1);
  	ath9k_hw_stopdmarecv(sc->sc_ah, &reset);
  
  	ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_FULL_SLEEP);
  }
  
  void ath9k_ps_wakeup(struct ath_softc *sc)
  {
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	unsigned long flags;
  	enum ath9k_power_mode power_mode;
  
  	spin_lock_irqsave(&sc->sc_pm_lock, flags);
  	if (++sc->ps_usecount != 1)
  		goto unlock;
  
  	del_timer_sync(&sc->sleep_timer);
  	power_mode = sc->sc_ah->power_mode;
  	ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_AWAKE);
  
  	/*
  	 * While the hardware is asleep, the cycle counters contain no
  	 * useful data. Better clear them now so that they don't mess up
  	 * survey data results.
  	 */
  	if (power_mode != ATH9K_PM_AWAKE) {
  		spin_lock(&common->cc_lock);
  		ath_hw_cycle_counters_update(common);
  		memset(&common->cc_survey, 0, sizeof(common->cc_survey));
  		memset(&common->cc_ani, 0, sizeof(common->cc_ani));
  		spin_unlock(&common->cc_lock);
  	}
  
   unlock:
  	spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
  }
  
  void ath9k_ps_restore(struct ath_softc *sc)
  {
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	enum ath9k_power_mode mode;
  	unsigned long flags;
  
  	spin_lock_irqsave(&sc->sc_pm_lock, flags);
  	if (--sc->ps_usecount != 0)
  		goto unlock;
  
  	if (sc->ps_idle) {
  		mod_timer(&sc->sleep_timer, jiffies + HZ / 10);
  		goto unlock;
  	}
  
  	if (sc->ps_enabled &&
  		   !(sc->ps_flags & (PS_WAIT_FOR_BEACON |
  				     PS_WAIT_FOR_CAB |
  				     PS_WAIT_FOR_PSPOLL_DATA |
  				     PS_WAIT_FOR_TX_ACK |
  				     PS_WAIT_FOR_ANI))) {
  		mode = ATH9K_PM_NETWORK_SLEEP;
  		if (ath9k_hw_btcoex_is_enabled(sc->sc_ah))
  			ath9k_btcoex_stop_gen_timer(sc);
  	} else {
  		goto unlock;
  	}
  
  	spin_lock(&common->cc_lock);
  	ath_hw_cycle_counters_update(common);
  	spin_unlock(&common->cc_lock);
  
  	ath9k_hw_setpower(sc->sc_ah, mode);
  
   unlock:
  	spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
  }
  
  static void __ath_cancel_work(struct ath_softc *sc)
  {
  	cancel_work_sync(&sc->paprd_work);
  	cancel_delayed_work_sync(&sc->tx_complete_work);
  	cancel_delayed_work_sync(&sc->hw_pll_work);
  
  #ifdef CONFIG_ATH9K_BTCOEX_SUPPORT
  	if (ath9k_hw_mci_is_enabled(sc->sc_ah))
  		cancel_work_sync(&sc->mci_work);
  #endif
  }
  
  void ath_cancel_work(struct ath_softc *sc)
  {
  	__ath_cancel_work(sc);
  	cancel_work_sync(&sc->hw_reset_work);
  }
  
  void ath_restart_work(struct ath_softc *sc)
  {
  	ieee80211_queue_delayed_work(sc->hw, &sc->tx_complete_work, 0);
  
  	if (AR_SREV_9340(sc->sc_ah) || AR_SREV_9330(sc->sc_ah))
  		ieee80211_queue_delayed_work(sc->hw, &sc->hw_pll_work,
  				     msecs_to_jiffies(ATH_PLL_WORK_INTERVAL));
  
  	ath_start_ani(sc);
  }
  
  static bool ath_prepare_reset(struct ath_softc *sc)
  {
  	struct ath_hw *ah = sc->sc_ah;
  	bool ret = true;
  
  	ieee80211_stop_queues(sc->hw);
  	ath_stop_ani(sc);
  	ath9k_hw_disable_interrupts(ah);
  
  	if (AR_SREV_9300_20_OR_LATER(ah)) {
  		ret &= ath_stoprecv(sc);
  		ret &= ath_drain_all_txq(sc);
  	} else {
  		ret &= ath_drain_all_txq(sc);
  		ret &= ath_stoprecv(sc);
  	}
  
  	return ret;
  }
  
  static bool ath_complete_reset(struct ath_softc *sc, bool start)
  {
  	struct ath_hw *ah = sc->sc_ah;
  	struct ath_common *common = ath9k_hw_common(ah);
  	unsigned long flags;
  
  	ath9k_calculate_summary_state(sc, sc->cur_chan);
  	ath_startrecv(sc);
  	ath9k_cmn_update_txpow(ah, sc->cur_chan->cur_txpower,
  			       sc->cur_chan->txpower,
  			       &sc->cur_chan->cur_txpower);
  	clear_bit(ATH_OP_HW_RESET, &common->op_flags);
  
  	if (!sc->cur_chan->offchannel && start) {
  		/* restore per chanctx TSF timer */
  		if (sc->cur_chan->tsf_val) {
  			u32 offset;
  
  			offset = ath9k_hw_get_tsf_offset(&sc->cur_chan->tsf_ts,
  							 NULL);
  			ath9k_hw_settsf64(ah, sc->cur_chan->tsf_val + offset);
  		}
  
  
  		if (!test_bit(ATH_OP_BEACONS, &common->op_flags))
  			goto work;
  
  		if (ah->opmode == NL80211_IFTYPE_STATION &&
  		    test_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags)) {
  			spin_lock_irqsave(&sc->sc_pm_lock, flags);
  			sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON;
  			spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
  		} else {
  			ath9k_set_beacon(sc);
  		}
  	work:
  		ath_restart_work(sc);
  		ath_txq_schedule_all(sc);
  	}
  
  	sc->gtt_cnt = 0;
  
  	ath9k_hw_set_interrupts(ah);
  	ath9k_hw_enable_interrupts(ah);
  	ieee80211_wake_queues(sc->hw);
  	ath9k_p2p_ps_timer(sc);
  
  	return true;
  }
  
  static int ath_reset_internal(struct ath_softc *sc, struct ath9k_channel *hchan)
  {
  	struct ath_hw *ah = sc->sc_ah;
  	struct ath_common *common = ath9k_hw_common(ah);
  	struct ath9k_hw_cal_data *caldata = NULL;
  	bool fastcc = true;
  	int r;
  
  	__ath_cancel_work(sc);
  
  	disable_irq(sc->irq);
  	tasklet_disable(&sc->intr_tq);
  	tasklet_disable(&sc->bcon_tasklet);
  	spin_lock_bh(&sc->sc_pcu_lock);
  
  	if (!sc->cur_chan->offchannel) {
  		fastcc = false;
  		caldata = &sc->cur_chan->caldata;
  	}
  
  	if (!hchan) {
  		fastcc = false;
  		hchan = ah->curchan;
  	}
  
  	if (!ath_prepare_reset(sc))
  		fastcc = false;
  
  	if (ath9k_is_chanctx_enabled())
  		fastcc = false;
  
  	spin_lock_bh(&sc->chan_lock);
  	sc->cur_chandef = sc->cur_chan->chandef;
  	spin_unlock_bh(&sc->chan_lock);
  
  	ath_dbg(common, CONFIG, "Reset to %u MHz, HT40: %d fastcc: %d\n",
  		hchan->channel, IS_CHAN_HT40(hchan), fastcc);
  
  	r = ath9k_hw_reset(ah, hchan, caldata, fastcc);
  	if (r) {
  		ath_err(common,
  			"Unable to reset channel, reset status %d\n", r);
  
  		ath9k_hw_enable_interrupts(ah);
  		ath9k_queue_reset(sc, RESET_TYPE_BB_HANG);
  
  		goto out;
  	}
  
  	if (ath9k_hw_mci_is_enabled(sc->sc_ah) &&
  	    sc->cur_chan->offchannel)
  		ath9k_mci_set_txpower(sc, true, false);
  
  	if (!ath_complete_reset(sc, true))
  		r = -EIO;
  
  out:
  	enable_irq(sc->irq);
  	spin_unlock_bh(&sc->sc_pcu_lock);
  	tasklet_enable(&sc->bcon_tasklet);
  	tasklet_enable(&sc->intr_tq);
  
  	return r;
  }
  
  static void ath_node_attach(struct ath_softc *sc, struct ieee80211_sta *sta,
  			    struct ieee80211_vif *vif)
  {
  	struct ath_node *an;
  	an = (struct ath_node *)sta->drv_priv;
  
  	an->sc = sc;
  	an->sta = sta;
  	an->vif = vif;
  	memset(&an->key_idx, 0, sizeof(an->key_idx));
  
  	ath_tx_node_init(sc, an);
  
  	ath_dynack_node_init(sc->sc_ah, an);
  }
  
  static void ath_node_detach(struct ath_softc *sc, struct ieee80211_sta *sta)
  {
  	struct ath_node *an = (struct ath_node *)sta->drv_priv;
  	ath_tx_node_cleanup(sc, an);
  
  	ath_dynack_node_deinit(sc->sc_ah, an);
  }
  
  void ath9k_tasklet(unsigned long data)
  {
  	struct ath_softc *sc = (struct ath_softc *)data;
  	struct ath_hw *ah = sc->sc_ah;
  	struct ath_common *common = ath9k_hw_common(ah);
  	enum ath_reset_type type;
  	unsigned long flags;
  	u32 status = sc->intrstatus;
  	u32 rxmask;
  
  	ath9k_ps_wakeup(sc);
  	spin_lock(&sc->sc_pcu_lock);
  
  	if (status & ATH9K_INT_FATAL) {
  		type = RESET_TYPE_FATAL_INT;
  		ath9k_queue_reset(sc, type);
  
  		/*
  		 * Increment the ref. counter here so that
  		 * interrupts are enabled in the reset routine.
  		 */
  		atomic_inc(&ah->intr_ref_cnt);
  		ath_dbg(common, RESET, "FATAL: Skipping interrupts\n");
  		goto out;
  	}
  
  	if ((ah->config.hw_hang_checks & HW_BB_WATCHDOG) &&
  	    (status & ATH9K_INT_BB_WATCHDOG)) {
  		spin_lock(&common->cc_lock);
  		ath_hw_cycle_counters_update(common);
  		ar9003_hw_bb_watchdog_dbg_info(ah);
  		spin_unlock(&common->cc_lock);
  
  		if (ar9003_hw_bb_watchdog_check(ah)) {
  			type = RESET_TYPE_BB_WATCHDOG;
  			ath9k_queue_reset(sc, type);
  
  			/*
  			 * Increment the ref. counter here so that
  			 * interrupts are enabled in the reset routine.
  			 */
  			atomic_inc(&ah->intr_ref_cnt);
  			ath_dbg(common, RESET,
  				"BB_WATCHDOG: Skipping interrupts\n");
  			goto out;
  		}
  	}
  
  	if (status & ATH9K_INT_GTT) {
  		sc->gtt_cnt++;
  
  		if ((sc->gtt_cnt >= MAX_GTT_CNT) && !ath9k_hw_check_alive(ah)) {
  			type = RESET_TYPE_TX_GTT;
  			ath9k_queue_reset(sc, type);
  			atomic_inc(&ah->intr_ref_cnt);
  			ath_dbg(common, RESET,
  				"GTT: Skipping interrupts\n");
  			goto out;
  		}
  	}
  
  	spin_lock_irqsave(&sc->sc_pm_lock, flags);
  	if ((status & ATH9K_INT_TSFOOR) && sc->ps_enabled) {
  		/*
  		 * TSF sync does not look correct; remain awake to sync with
  		 * the next Beacon.
  		 */
  		ath_dbg(common, PS, "TSFOOR - Sync with next Beacon\n");
  		sc->ps_flags |= PS_WAIT_FOR_BEACON | PS_BEACON_SYNC;
  	}
  	spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
  
  	if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
  		rxmask = (ATH9K_INT_RXHP | ATH9K_INT_RXLP | ATH9K_INT_RXEOL |
  			  ATH9K_INT_RXORN);
  	else
  		rxmask = (ATH9K_INT_RX | ATH9K_INT_RXEOL | ATH9K_INT_RXORN);
  
  	if (status & rxmask) {
  		/* Check for high priority Rx first */
  		if ((ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) &&
  		    (status & ATH9K_INT_RXHP))
  			ath_rx_tasklet(sc, 0, true);
  
  		ath_rx_tasklet(sc, 0, false);
  	}
  
  	if (status & ATH9K_INT_TX) {
  		if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
  			/*
  			 * For EDMA chips, TX completion is enabled for the
  			 * beacon queue, so if a beacon has been transmitted
  			 * successfully after a GTT interrupt, the GTT counter
  			 * gets reset to zero here.
  			 */
  			sc->gtt_cnt = 0;
  
  			ath_tx_edma_tasklet(sc);
  		} else {
  			ath_tx_tasklet(sc);
  		}
  
  		wake_up(&sc->tx_wait);
  	}
  
  	if (status & ATH9K_INT_GENTIMER)
  		ath_gen_timer_isr(sc->sc_ah);
  
  	ath9k_btcoex_handle_interrupt(sc, status);
  
  	/* re-enable hardware interrupt */
  	ath9k_hw_enable_interrupts(ah);
  out:
  	spin_unlock(&sc->sc_pcu_lock);
  	ath9k_ps_restore(sc);
  }
  
  irqreturn_t ath_isr(int irq, void *dev)
  {
  #define SCHED_INTR (				\
  		ATH9K_INT_FATAL |		\
  		ATH9K_INT_BB_WATCHDOG |		\
  		ATH9K_INT_RXORN |		\
  		ATH9K_INT_RXEOL |		\
  		ATH9K_INT_RX |			\
  		ATH9K_INT_RXLP |		\
  		ATH9K_INT_RXHP |		\
  		ATH9K_INT_TX |			\
  		ATH9K_INT_BMISS |		\
  		ATH9K_INT_CST |			\
  		ATH9K_INT_GTT |			\
  		ATH9K_INT_TSFOOR |		\
  		ATH9K_INT_GENTIMER |		\
  		ATH9K_INT_MCI)
  
  	struct ath_softc *sc = dev;
  	struct ath_hw *ah = sc->sc_ah;
  	struct ath_common *common = ath9k_hw_common(ah);
  	enum ath9k_int status;
  	u32 sync_cause = 0;
  	bool sched = false;
  
  	/*
  	 * The hardware is not ready/present, don't
  	 * touch anything. Note this can happen early
  	 * on if the IRQ is shared.
  	 */
  	if (!ah || test_bit(ATH_OP_INVALID, &common->op_flags))
  		return IRQ_NONE;
  
  	/* shared irq, not for us */
  	if (!ath9k_hw_intrpend(ah))
  		return IRQ_NONE;
  
  	/*
  	 * Figure out the reason(s) for the interrupt.  Note
  	 * that the hal returns a pseudo-ISR that may include
  	 * bits we haven't explicitly enabled so we mask the
  	 * value to insure we only process bits we requested.
  	 */
  	ath9k_hw_getisr(ah, &status, &sync_cause); /* NB: clears ISR too */
  	ath9k_debug_sync_cause(sc, sync_cause);
  	status &= ah->imask;	/* discard unasked-for bits */
  
  	if (test_bit(ATH_OP_HW_RESET, &common->op_flags))
  		return IRQ_HANDLED;
  
  	/*
  	 * If there are no status bits set, then this interrupt was not
  	 * for me (should have been caught above).
  	 */
  	if (!status)
  		return IRQ_NONE;
  
  	/* Cache the status */
  	sc->intrstatus = status;
  
  	if (status & SCHED_INTR)
  		sched = true;
  
  	/*
  	 * If a FATAL interrupt is received, we have to reset the chip
  	 * immediately.
  	 */
  	if (status & ATH9K_INT_FATAL)
  		goto chip_reset;
  
  	if ((ah->config.hw_hang_checks & HW_BB_WATCHDOG) &&
  	    (status & ATH9K_INT_BB_WATCHDOG))
  		goto chip_reset;
  
  	if (status & ATH9K_INT_SWBA)
  		tasklet_schedule(&sc->bcon_tasklet);
  
  	if (status & ATH9K_INT_TXURN)
  		ath9k_hw_updatetxtriglevel(ah, true);
  
  	if (status & ATH9K_INT_RXEOL) {
  		ah->imask &= ~(ATH9K_INT_RXEOL | ATH9K_INT_RXORN);
  		ath9k_hw_set_interrupts(ah);
  	}
  
  	if (!(ah->caps.hw_caps & ATH9K_HW_CAP_AUTOSLEEP))
  		if (status & ATH9K_INT_TIM_TIMER) {
  			if (ATH_DBG_WARN_ON_ONCE(sc->ps_idle))
  				goto chip_reset;
  			/* Clear RxAbort bit so that we can
  			 * receive frames */
  			ath9k_setpower(sc, ATH9K_PM_AWAKE);
  			spin_lock(&sc->sc_pm_lock);
  			ath9k_hw_setrxabort(sc->sc_ah, 0);
  			sc->ps_flags |= PS_WAIT_FOR_BEACON;
  			spin_unlock(&sc->sc_pm_lock);
  		}
  
  chip_reset:
  
  	ath_debug_stat_interrupt(sc, status);
  
  	if (sched) {
  		/* turn off every interrupt */
  		ath9k_hw_disable_interrupts(ah);
  		tasklet_schedule(&sc->intr_tq);
  	}
  
  	return IRQ_HANDLED;
  
  #undef SCHED_INTR
  }
  
  /*
   * This function is called when a HW reset cannot be deferred
   * and has to be immediate.
   */
  int ath_reset(struct ath_softc *sc, struct ath9k_channel *hchan)
  {
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	int r;
  
  	ath9k_hw_kill_interrupts(sc->sc_ah);
  	set_bit(ATH_OP_HW_RESET, &common->op_flags);
  
  	ath9k_ps_wakeup(sc);
  	r = ath_reset_internal(sc, hchan);
  	ath9k_ps_restore(sc);
  
  	return r;
  }
  
  /*
   * When a HW reset can be deferred, it is added to the
   * hw_reset_work workqueue, but we set ATH_OP_HW_RESET before
   * queueing.
   */
  void ath9k_queue_reset(struct ath_softc *sc, enum ath_reset_type type)
  {
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  #ifdef CONFIG_ATH9K_DEBUGFS
  	RESET_STAT_INC(sc, type);
  #endif
  	ath9k_hw_kill_interrupts(sc->sc_ah);
  	set_bit(ATH_OP_HW_RESET, &common->op_flags);
  	ieee80211_queue_work(sc->hw, &sc->hw_reset_work);
  }
  
  void ath_reset_work(struct work_struct *work)
  {
  	struct ath_softc *sc = container_of(work, struct ath_softc, hw_reset_work);
  
  	ath9k_ps_wakeup(sc);
  	ath_reset_internal(sc, NULL);
  	ath9k_ps_restore(sc);
  }
  
  /**********************/
  /* mac80211 callbacks */
  /**********************/
  
  static int ath9k_start(struct ieee80211_hw *hw)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_hw *ah = sc->sc_ah;
  	struct ath_common *common = ath9k_hw_common(ah);
  	struct ieee80211_channel *curchan = sc->cur_chan->chandef.chan;
  	struct ath_chanctx *ctx = sc->cur_chan;
  	struct ath9k_channel *init_channel;
  	int r;
  
  	ath_dbg(common, CONFIG,
  		"Starting driver with initial channel: %d MHz\n",
  		curchan->center_freq);
  
  	ath9k_ps_wakeup(sc);
  	mutex_lock(&sc->mutex);
  
  	init_channel = ath9k_cmn_get_channel(hw, ah, &ctx->chandef);
  	sc->cur_chandef = hw->conf.chandef;
  
  	/* Reset SERDES registers */
  	ath9k_hw_configpcipowersave(ah, false);
  
  	/*
  	 * The basic interface to setting the hardware in a good
  	 * state is ``reset''.  On return the hardware is known to
  	 * be powered up and with interrupts disabled.  This must
  	 * be followed by initialization of the appropriate bits
  	 * and then setup of the interrupt mask.
  	 */
  	spin_lock_bh(&sc->sc_pcu_lock);
  
  	atomic_set(&ah->intr_ref_cnt, -1);
  
  	r = ath9k_hw_reset(ah, init_channel, ah->caldata, false);
  	if (r) {
  		ath_err(common,
  			"Unable to reset hardware; reset status %d (freq %u MHz)\n",
  			r, curchan->center_freq);
  		ah->reset_power_on = false;
  	}
  
  	/* Setup our intr mask. */
  	ah->imask = ATH9K_INT_TX | ATH9K_INT_RXEOL |
  		    ATH9K_INT_RXORN | ATH9K_INT_FATAL |
  		    ATH9K_INT_GLOBAL;
  
  	if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
  		ah->imask |= ATH9K_INT_RXHP |
  			     ATH9K_INT_RXLP;
  	else
  		ah->imask |= ATH9K_INT_RX;
  
  	if (ah->config.hw_hang_checks & HW_BB_WATCHDOG)
  		ah->imask |= ATH9K_INT_BB_WATCHDOG;
  
  	/*
  	 * Enable GTT interrupts only for AR9003/AR9004 chips
  	 * for now.
  	 */
  	if (AR_SREV_9300_20_OR_LATER(ah))
  		ah->imask |= ATH9K_INT_GTT;
  
  	if (ah->caps.hw_caps & ATH9K_HW_CAP_HT)
  		ah->imask |= ATH9K_INT_CST;
  
  	ath_mci_enable(sc);
  
  	clear_bit(ATH_OP_INVALID, &common->op_flags);
  	sc->sc_ah->is_monitoring = false;
  
  	if (!ath_complete_reset(sc, false))
  		ah->reset_power_on = false;
  
  	if (ah->led_pin >= 0) {
  		ath9k_hw_cfg_output(ah, ah->led_pin,
  				    AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
  		ath9k_hw_set_gpio(ah, ah->led_pin,
  				  (ah->config.led_active_high) ? 1 : 0);
  	}
  
  	/*
  	 * Reset key cache to sane defaults (all entries cleared) instead of
  	 * semi-random values after suspend/resume.
  	 */
  	ath9k_cmn_init_crypto(sc->sc_ah);
  
  	ath9k_hw_reset_tsf(ah);
  
  	spin_unlock_bh(&sc->sc_pcu_lock);
  
  	mutex_unlock(&sc->mutex);
  
  	ath9k_ps_restore(sc);
  
  	return 0;
  }
  
  static void ath9k_tx(struct ieee80211_hw *hw,
  		     struct ieee80211_tx_control *control,
  		     struct sk_buff *skb)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	struct ath_tx_control txctl;
  	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
  	unsigned long flags;
  
  	if (sc->ps_enabled) {
  		/*
  		 * mac80211 does not set PM field for normal data frames, so we
  		 * need to update that based on the current PS mode.
  		 */
  		if (ieee80211_is_data(hdr->frame_control) &&
  		    !ieee80211_is_nullfunc(hdr->frame_control) &&
  		    !ieee80211_has_pm(hdr->frame_control)) {
  			ath_dbg(common, PS,
  				"Add PM=1 for a TX frame while in PS mode\n");
  			hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
  		}
  	}
  
  	if (unlikely(sc->sc_ah->power_mode == ATH9K_PM_NETWORK_SLEEP)) {
  		/*
  		 * We are using PS-Poll and mac80211 can request TX while in
  		 * power save mode. Need to wake up hardware for the TX to be
  		 * completed and if needed, also for RX of buffered frames.
  		 */
  		ath9k_ps_wakeup(sc);
  		spin_lock_irqsave(&sc->sc_pm_lock, flags);
  		if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_AUTOSLEEP))
  			ath9k_hw_setrxabort(sc->sc_ah, 0);
  		if (ieee80211_is_pspoll(hdr->frame_control)) {
  			ath_dbg(common, PS,
  				"Sending PS-Poll to pick a buffered frame\n");
  			sc->ps_flags |= PS_WAIT_FOR_PSPOLL_DATA;
  		} else {
  			ath_dbg(common, PS, "Wake up to complete TX\n");
  			sc->ps_flags |= PS_WAIT_FOR_TX_ACK;
  		}
  		/*
  		 * The actual restore operation will happen only after
  		 * the ps_flags bit is cleared. We are just dropping
  		 * the ps_usecount here.
  		 */
  		spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
  		ath9k_ps_restore(sc);
  	}
  
  	/*
  	 * Cannot tx while the hardware is in full sleep, it first needs a full
  	 * chip reset to recover from that
  	 */
  	if (unlikely(sc->sc_ah->power_mode == ATH9K_PM_FULL_SLEEP)) {
  		ath_err(common, "TX while HW is in FULL_SLEEP mode\n");
  		goto exit;
  	}
  
  	memset(&txctl, 0, sizeof(struct ath_tx_control));
  	txctl.txq = sc->tx.txq_map[skb_get_queue_mapping(skb)];
  	txctl.sta = control->sta;
  
  	ath_dbg(common, XMIT, "transmitting packet, skb: %p\n", skb);
  
  	if (ath_tx_start(hw, skb, &txctl) != 0) {
  		ath_dbg(common, XMIT, "TX failed\n");
  		TX_STAT_INC(txctl.txq->axq_qnum, txfailed);
  		goto exit;
  	}
  
  	return;
  exit:
  	ieee80211_free_txskb(hw, skb);
  }
  
  static void ath9k_stop(struct ieee80211_hw *hw)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_hw *ah = sc->sc_ah;
  	struct ath_common *common = ath9k_hw_common(ah);
  	bool prev_idle;
  
  	ath9k_deinit_channel_context(sc);
  
  	mutex_lock(&sc->mutex);
  
  	ath_cancel_work(sc);
  
  	if (test_bit(ATH_OP_INVALID, &common->op_flags)) {
  		ath_dbg(common, ANY, "Device not present\n");
  		mutex_unlock(&sc->mutex);
  		return;
  	}
  
  	/* Ensure HW is awake when we try to shut it down. */
  	ath9k_ps_wakeup(sc);
  
  	spin_lock_bh(&sc->sc_pcu_lock);
  
  	/* prevent tasklets to enable interrupts once we disable them */
  	ah->imask &= ~ATH9K_INT_GLOBAL;
  
  	/* make sure h/w will not generate any interrupt
  	 * before setting the invalid flag. */
  	ath9k_hw_disable_interrupts(ah);
  
  	spin_unlock_bh(&sc->sc_pcu_lock);
  
  	/* we can now sync irq and kill any running tasklets, since we already
  	 * disabled interrupts and not holding a spin lock */
  	synchronize_irq(sc->irq);
  	tasklet_kill(&sc->intr_tq);
  	tasklet_kill(&sc->bcon_tasklet);
  
  	prev_idle = sc->ps_idle;
  	sc->ps_idle = true;
  
  	spin_lock_bh(&sc->sc_pcu_lock);
  
  	if (ah->led_pin >= 0) {
  		ath9k_hw_set_gpio(ah, ah->led_pin,
  				  (ah->config.led_active_high) ? 0 : 1);
  		ath9k_hw_cfg_gpio_input(ah, ah->led_pin);
  	}
  
  	ath_prepare_reset(sc);
  
  	if (sc->rx.frag) {
  		dev_kfree_skb_any(sc->rx.frag);
  		sc->rx.frag = NULL;
  	}
  
  	if (!ah->curchan)
  		ah->curchan = ath9k_cmn_get_channel(hw, ah,
  						    &sc->cur_chan->chandef);
  
  	ath9k_hw_reset(ah, ah->curchan, ah->caldata, false);
  
  	set_bit(ATH_OP_INVALID, &common->op_flags);
  
  	ath9k_hw_phy_disable(ah);
  
  	ath9k_hw_configpcipowersave(ah, true);
  
  	spin_unlock_bh(&sc->sc_pcu_lock);
  
  	ath9k_ps_restore(sc);
  
  	sc->ps_idle = prev_idle;
  
  	mutex_unlock(&sc->mutex);
  
  	ath_dbg(common, CONFIG, "Driver halt\n");
  }
  
  static bool ath9k_uses_beacons(int type)
  {
  	switch (type) {
  	case NL80211_IFTYPE_AP:
  	case NL80211_IFTYPE_ADHOC:
  	case NL80211_IFTYPE_MESH_POINT:
  		return true;
  	default:
  		return false;
  	}
  }
  
  static void ath9k_vif_iter(struct ath9k_vif_iter_data *iter_data,
  			   u8 *mac, struct ieee80211_vif *vif)
  {
  	struct ath_vif *avp = (struct ath_vif *)vif->drv_priv;
  	int i;
  
  	if (iter_data->has_hw_macaddr) {
  		for (i = 0; i < ETH_ALEN; i++)
  			iter_data->mask[i] &=
  				~(iter_data->hw_macaddr[i] ^ mac[i]);
  	} else {
  		memcpy(iter_data->hw_macaddr, mac, ETH_ALEN);
  		iter_data->has_hw_macaddr = true;
  	}
  
  	if (!vif->bss_conf.use_short_slot)
  		iter_data->slottime = ATH9K_SLOT_TIME_20;
  
  	switch (vif->type) {
  	case NL80211_IFTYPE_AP:
  		iter_data->naps++;
  		break;
  	case NL80211_IFTYPE_STATION:
  		iter_data->nstations++;
  		if (avp->assoc && !iter_data->primary_sta)
  			iter_data->primary_sta = vif;
  		break;
  	case NL80211_IFTYPE_OCB:
  		iter_data->nocbs++;
  		break;
  	case NL80211_IFTYPE_ADHOC:
  		iter_data->nadhocs++;
  		if (vif->bss_conf.enable_beacon)
  			iter_data->beacons = true;
  		break;
  	case NL80211_IFTYPE_MESH_POINT:
  		iter_data->nmeshes++;
  		if (vif->bss_conf.enable_beacon)
  			iter_data->beacons = true;
  		break;
  	case NL80211_IFTYPE_WDS:
  		iter_data->nwds++;
  		break;
  	default:
  		break;
  	}
  }
  
  static void ath9k_update_bssid_mask(struct ath_softc *sc,
  				    struct ath_chanctx *ctx,
  				    struct ath9k_vif_iter_data *iter_data)
  {
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	struct ath_vif *avp;
  	int i;
  
  	if (!ath9k_is_chanctx_enabled())
  		return;
  
  	list_for_each_entry(avp, &ctx->vifs, list) {
  		if (ctx->nvifs_assigned != 1)
  			continue;
  
  		if (!avp->vif->p2p || !iter_data->has_hw_macaddr)
  			continue;
  
  		ether_addr_copy(common->curbssid, avp->bssid);
  
  		/* perm_addr will be used as the p2p device address. */
  		for (i = 0; i < ETH_ALEN; i++)
  			iter_data->mask[i] &=
  				~(iter_data->hw_macaddr[i] ^
  				  sc->hw->wiphy->perm_addr[i]);
  	}
  }
  
  /* Called with sc->mutex held. */
  void ath9k_calculate_iter_data(struct ath_softc *sc,
  			       struct ath_chanctx *ctx,
  			       struct ath9k_vif_iter_data *iter_data)
  {
  	struct ath_vif *avp;
  
  	/*
  	 * The hardware will use primary station addr together with the
  	 * BSSID mask when matching addresses.
  	 */
  	memset(iter_data, 0, sizeof(*iter_data));
  	eth_broadcast_addr(iter_data->mask);
  	iter_data->slottime = ATH9K_SLOT_TIME_9;
  
  	list_for_each_entry(avp, &ctx->vifs, list)
  		ath9k_vif_iter(iter_data, avp->vif->addr, avp->vif);
  
  	ath9k_update_bssid_mask(sc, ctx, iter_data);
  }
  
  static void ath9k_set_assoc_state(struct ath_softc *sc,
  				  struct ieee80211_vif *vif, bool changed)
  {
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	struct ath_vif *avp = (struct ath_vif *)vif->drv_priv;
  	unsigned long flags;
  
  	set_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags);
  
  	ether_addr_copy(common->curbssid, avp->bssid);
  	common->curaid = avp->aid;
  	ath9k_hw_write_associd(sc->sc_ah);
  
  	if (changed) {
  		common->last_rssi = ATH_RSSI_DUMMY_MARKER;
  		sc->sc_ah->stats.avgbrssi = ATH_RSSI_DUMMY_MARKER;
  
  		spin_lock_irqsave(&sc->sc_pm_lock, flags);
  		sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON;
  		spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
  	}
  
  	if (ath9k_hw_mci_is_enabled(sc->sc_ah))
  		ath9k_mci_update_wlan_channels(sc, false);
  
  	ath_dbg(common, CONFIG,
  		"Primary Station interface: %pM, BSSID: %pM\n",
  		vif->addr, common->curbssid);
  }
  
  #ifdef CONFIG_ATH9K_CHANNEL_CONTEXT
  static void ath9k_set_offchannel_state(struct ath_softc *sc)
  {
  	struct ath_hw *ah = sc->sc_ah;
  	struct ath_common *common = ath9k_hw_common(ah);
  	struct ieee80211_vif *vif = NULL;
  
  	ath9k_ps_wakeup(sc);
  
  	if (sc->offchannel.state < ATH_OFFCHANNEL_ROC_START)
  		vif = sc->offchannel.scan_vif;
  	else
  		vif = sc->offchannel.roc_vif;
  
  	if (WARN_ON(!vif))
  		goto exit;
  
  	eth_zero_addr(common->curbssid);
  	eth_broadcast_addr(common->bssidmask);
  	memcpy(common->macaddr, vif->addr, ETH_ALEN);
  	common->curaid = 0;
  	ah->opmode = vif->type;
  	ah->imask &= ~ATH9K_INT_SWBA;
  	ah->imask &= ~ATH9K_INT_TSFOOR;
  	ah->slottime = ATH9K_SLOT_TIME_9;
  
  	ath_hw_setbssidmask(common);
  	ath9k_hw_setopmode(ah);
  	ath9k_hw_write_associd(sc->sc_ah);
  	ath9k_hw_set_interrupts(ah);
  	ath9k_hw_init_global_settings(ah);
  
  exit:
  	ath9k_ps_restore(sc);
  }
  #endif
  
  /* Called with sc->mutex held. */
  void ath9k_calculate_summary_state(struct ath_softc *sc,
  				   struct ath_chanctx *ctx)
  {
  	struct ath_hw *ah = sc->sc_ah;
  	struct ath_common *common = ath9k_hw_common(ah);
  	struct ath9k_vif_iter_data iter_data;
  	struct ath_beacon_config *cur_conf;
  
  	ath_chanctx_check_active(sc, ctx);
  
  	if (ctx != sc->cur_chan)
  		return;
  
  #ifdef CONFIG_ATH9K_CHANNEL_CONTEXT
  	if (ctx == &sc->offchannel.chan)
  		return ath9k_set_offchannel_state(sc);
  #endif
  
  	ath9k_ps_wakeup(sc);
  	ath9k_calculate_iter_data(sc, ctx, &iter_data);
  
  	if (iter_data.has_hw_macaddr)
  		memcpy(common->macaddr, iter_data.hw_macaddr, ETH_ALEN);
  
  	memcpy(common->bssidmask, iter_data.mask, ETH_ALEN);
  	ath_hw_setbssidmask(common);
  
  	if (iter_data.naps > 0) {
  		cur_conf = &ctx->beacon;
  		ath9k_hw_set_tsfadjust(ah, true);
  		ah->opmode = NL80211_IFTYPE_AP;
  		if (cur_conf->enable_beacon)
  			iter_data.beacons = true;
  	} else {
  		ath9k_hw_set_tsfadjust(ah, false);
  
  		if (iter_data.nmeshes)
  			ah->opmode = NL80211_IFTYPE_MESH_POINT;
  		else if (iter_data.nocbs)
  			ah->opmode = NL80211_IFTYPE_OCB;
  		else if (iter_data.nwds)
  			ah->opmode = NL80211_IFTYPE_AP;
  		else if (iter_data.nadhocs)
  			ah->opmode = NL80211_IFTYPE_ADHOC;
  		else
  			ah->opmode = NL80211_IFTYPE_STATION;
  	}
  
  	ath9k_hw_setopmode(ah);
  
  	ctx->switch_after_beacon = false;
  	if ((iter_data.nstations + iter_data.nadhocs + iter_data.nmeshes) > 0)
  		ah->imask |= ATH9K_INT_TSFOOR;
  	else {
  		ah->imask &= ~ATH9K_INT_TSFOOR;
  		if (iter_data.naps == 1 && iter_data.beacons)
  			ctx->switch_after_beacon = true;
  	}
  
  	ah->imask &= ~ATH9K_INT_SWBA;
  	if (ah->opmode == NL80211_IFTYPE_STATION) {
  		bool changed = (iter_data.primary_sta != ctx->primary_sta);
  
  		if (iter_data.primary_sta) {
  			iter_data.beacons = true;
  			ath9k_set_assoc_state(sc, iter_data.primary_sta,
  					      changed);
  			ctx->primary_sta = iter_data.primary_sta;
  		} else {
  			ctx->primary_sta = NULL;
  			eth_zero_addr(common->curbssid);
  			common->curaid = 0;
  			ath9k_hw_write_associd(sc->sc_ah);
  			if (ath9k_hw_mci_is_enabled(sc->sc_ah))
  				ath9k_mci_update_wlan_channels(sc, true);
  		}
  	} else if (iter_data.beacons) {
  		ah->imask |= ATH9K_INT_SWBA;
  	}
  	ath9k_hw_set_interrupts(ah);
  
  	if (iter_data.beacons)
  		set_bit(ATH_OP_BEACONS, &common->op_flags);
  	else
  		clear_bit(ATH_OP_BEACONS, &common->op_flags);
  
  	if (ah->slottime != iter_data.slottime) {
  		ah->slottime = iter_data.slottime;
  		ath9k_hw_init_global_settings(ah);
  	}
  
  	if (iter_data.primary_sta)
  		set_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags);
  	else
  		clear_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags);
  
  	ath_dbg(common, CONFIG,
  		"macaddr: %pM, bssid: %pM, bssidmask: %pM\n",
  		common->macaddr, common->curbssid, common->bssidmask);
  
  	ath9k_ps_restore(sc);
  }
  
  static void ath9k_tpc_vif_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
  {
  	int *power = (int *)data;
  
  	if (*power < vif->bss_conf.txpower)
  		*power = vif->bss_conf.txpower;
  }
  
  /* Called with sc->mutex held. */
  void ath9k_set_txpower(struct ath_softc *sc, struct ieee80211_vif *vif)
  {
  	int power;
  	struct ath_hw *ah = sc->sc_ah;
  	struct ath_regulatory *reg = ath9k_hw_regulatory(ah);
  
  	ath9k_ps_wakeup(sc);
  	if (ah->tpc_enabled) {
  		power = (vif) ? vif->bss_conf.txpower : -1;
  		ieee80211_iterate_active_interfaces_atomic(
  				sc->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
  				ath9k_tpc_vif_iter, &power);
  		if (power == -1)
  			power = sc->hw->conf.power_level;
  	} else {
  		power = sc->hw->conf.power_level;
  	}
  	sc->cur_chan->txpower = 2 * power;
  	ath9k_hw_set_txpowerlimit(ah, sc->cur_chan->txpower, false);
  	sc->cur_chan->cur_txpower = reg->max_power_level;
  	ath9k_ps_restore(sc);
  }
  
  static void ath9k_assign_hw_queues(struct ieee80211_hw *hw,
  				   struct ieee80211_vif *vif)
  {
  	int i;
  
  	if (!ath9k_is_chanctx_enabled())
  		return;
  
  	for (i = 0; i < IEEE80211_NUM_ACS; i++)
  		vif->hw_queue[i] = i;
  
  	if (vif->type == NL80211_IFTYPE_AP ||
  	    vif->type == NL80211_IFTYPE_MESH_POINT)
  		vif->cab_queue = hw->queues - 2;
  	else
  		vif->cab_queue = IEEE80211_INVAL_HW_QUEUE;
  }
  
  static int ath9k_add_interface(struct ieee80211_hw *hw,
  			       struct ieee80211_vif *vif)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_hw *ah = sc->sc_ah;
  	struct ath_common *common = ath9k_hw_common(ah);
  	struct ath_vif *avp = (void *)vif->drv_priv;
  	struct ath_node *an = &avp->mcast_node;
  
  	mutex_lock(&sc->mutex);
  
  	if (config_enabled(CONFIG_ATH9K_TX99)) {
  		if (sc->cur_chan->nvifs >= 1) {
  			mutex_unlock(&sc->mutex);
  			return -EOPNOTSUPP;
  		}
  		sc->tx99_vif = vif;
  	}
  
  	ath_dbg(common, CONFIG, "Attach a VIF of type: %d\n", vif->type);
  	sc->cur_chan->nvifs++;
  
  	if (ath9k_uses_beacons(vif->type))
  		ath9k_beacon_assign_slot(sc, vif);
  
  	avp->vif = vif;
  	if (!ath9k_is_chanctx_enabled()) {
  		avp->chanctx = sc->cur_chan;
  		list_add_tail(&avp->list, &avp->chanctx->vifs);
  	}
  
  	ath9k_calculate_summary_state(sc, avp->chanctx);
  
  	ath9k_assign_hw_queues(hw, vif);
  
  	ath9k_set_txpower(sc, vif);
  
  	an->sc = sc;
  	an->sta = NULL;
  	an->vif = vif;
  	an->no_ps_filter = true;
  	ath_tx_node_init(sc, an);
  
  	mutex_unlock(&sc->mutex);
  	return 0;
  }
  
  static int ath9k_change_interface(struct ieee80211_hw *hw,
  				  struct ieee80211_vif *vif,
  				  enum nl80211_iftype new_type,
  				  bool p2p)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	struct ath_vif *avp = (void *)vif->drv_priv;
  
  	mutex_lock(&sc->mutex);
  
  	if (config_enabled(CONFIG_ATH9K_TX99)) {
  		mutex_unlock(&sc->mutex);
  		return -EOPNOTSUPP;
  	}
  
  	ath_dbg(common, CONFIG, "Change Interface\n");
  
  	if (ath9k_uses_beacons(vif->type))
  		ath9k_beacon_remove_slot(sc, vif);
  
  	vif->type = new_type;
  	vif->p2p = p2p;
  
  	if (ath9k_uses_beacons(vif->type))
  		ath9k_beacon_assign_slot(sc, vif);
  
  	ath9k_assign_hw_queues(hw, vif);
  	ath9k_calculate_summary_state(sc, avp->chanctx);
  
  	ath9k_set_txpower(sc, vif);
  
  	mutex_unlock(&sc->mutex);
  	return 0;
  }
  
  static void ath9k_remove_interface(struct ieee80211_hw *hw,
  				   struct ieee80211_vif *vif)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	struct ath_vif *avp = (void *)vif->drv_priv;
  
  	ath_dbg(common, CONFIG, "Detach Interface\n");
  
  	mutex_lock(&sc->mutex);
  
  	ath9k_p2p_remove_vif(sc, vif);
  
  	sc->cur_chan->nvifs--;
  	sc->tx99_vif = NULL;
  	if (!ath9k_is_chanctx_enabled())
  		list_del(&avp->list);
  
  	if (ath9k_uses_beacons(vif->type))
  		ath9k_beacon_remove_slot(sc, vif);
  
  	ath_tx_node_cleanup(sc, &avp->mcast_node);
  
  	ath9k_calculate_summary_state(sc, avp->chanctx);
  
  	ath9k_set_txpower(sc, NULL);
  
  	mutex_unlock(&sc->mutex);
  }
  
  static void ath9k_enable_ps(struct ath_softc *sc)
  {
  	struct ath_hw *ah = sc->sc_ah;
  	struct ath_common *common = ath9k_hw_common(ah);
  
  	if (config_enabled(CONFIG_ATH9K_TX99))
  		return;
  
  	sc->ps_enabled = true;
  	if (!(ah->caps.hw_caps & ATH9K_HW_CAP_AUTOSLEEP)) {
  		if ((ah->imask & ATH9K_INT_TIM_TIMER) == 0) {
  			ah->imask |= ATH9K_INT_TIM_TIMER;
  			ath9k_hw_set_interrupts(ah);
  		}
  		ath9k_hw_setrxabort(ah, 1);
  	}
  	ath_dbg(common, PS, "PowerSave enabled\n");
  }
  
  static void ath9k_disable_ps(struct ath_softc *sc)
  {
  	struct ath_hw *ah = sc->sc_ah;
  	struct ath_common *common = ath9k_hw_common(ah);
  
  	if (config_enabled(CONFIG_ATH9K_TX99))
  		return;
  
  	sc->ps_enabled = false;
  	ath9k_hw_setpower(ah, ATH9K_PM_AWAKE);
  	if (!(ah->caps.hw_caps & ATH9K_HW_CAP_AUTOSLEEP)) {
  		ath9k_hw_setrxabort(ah, 0);
  		sc->ps_flags &= ~(PS_WAIT_FOR_BEACON |
  				  PS_WAIT_FOR_CAB |
  				  PS_WAIT_FOR_PSPOLL_DATA |
  				  PS_WAIT_FOR_TX_ACK);
  		if (ah->imask & ATH9K_INT_TIM_TIMER) {
  			ah->imask &= ~ATH9K_INT_TIM_TIMER;
  			ath9k_hw_set_interrupts(ah);
  		}
  	}
  	ath_dbg(common, PS, "PowerSave disabled\n");
  }
  
  static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_hw *ah = sc->sc_ah;
  	struct ath_common *common = ath9k_hw_common(ah);
  	struct ieee80211_conf *conf = &hw->conf;
  	struct ath_chanctx *ctx = sc->cur_chan;
  
  	ath9k_ps_wakeup(sc);
  	mutex_lock(&sc->mutex);
  
  	if (changed & IEEE80211_CONF_CHANGE_IDLE) {
  		sc->ps_idle = !!(conf->flags & IEEE80211_CONF_IDLE);
  		if (sc->ps_idle) {
  			ath_cancel_work(sc);
  			ath9k_stop_btcoex(sc);
  		} else {
  			ath9k_start_btcoex(sc);
  			/*
  			 * The chip needs a reset to properly wake up from
  			 * full sleep
  			 */
  			ath_chanctx_set_channel(sc, ctx, &ctx->chandef);
  		}
  	}
  
  	/*
  	 * We just prepare to enable PS. We have to wait until our AP has
  	 * ACK'd our null data frame to disable RX otherwise we'll ignore
  	 * those ACKs and end up retransmitting the same null data frames.
  	 * IEEE80211_CONF_CHANGE_PS is only passed by mac80211 for STA mode.
  	 */
  	if (changed & IEEE80211_CONF_CHANGE_PS) {
  		unsigned long flags;
  		spin_lock_irqsave(&sc->sc_pm_lock, flags);
  		if (conf->flags & IEEE80211_CONF_PS)
  			ath9k_enable_ps(sc);
  		else
  			ath9k_disable_ps(sc);
  		spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
  	}
  
  	if (changed & IEEE80211_CONF_CHANGE_MONITOR) {
  		if (conf->flags & IEEE80211_CONF_MONITOR) {
  			ath_dbg(common, CONFIG, "Monitor mode is enabled\n");
  			sc->sc_ah->is_monitoring = true;
  		} else {
  			ath_dbg(common, CONFIG, "Monitor mode is disabled\n");
  			sc->sc_ah->is_monitoring = false;
  		}
  	}
  
  	if (!ath9k_is_chanctx_enabled() && (changed & IEEE80211_CONF_CHANGE_CHANNEL)) {
  		ctx->offchannel = !!(conf->flags & IEEE80211_CONF_OFFCHANNEL);
  		ath_chanctx_set_channel(sc, ctx, &hw->conf.chandef);
  	}
  
  	mutex_unlock(&sc->mutex);
  	ath9k_ps_restore(sc);
  
  	return 0;
  }
  
  #define SUPPORTED_FILTERS			\
  	(FIF_ALLMULTI |				\
  	FIF_CONTROL |				\
  	FIF_PSPOLL |				\
  	FIF_OTHER_BSS |				\
  	FIF_BCN_PRBRESP_PROMISC |		\
  	FIF_PROBE_REQ |				\
  	FIF_FCSFAIL)
  
  /* FIXME: sc->sc_full_reset ? */
  static void ath9k_configure_filter(struct ieee80211_hw *hw,
  				   unsigned int changed_flags,
  				   unsigned int *total_flags,
  				   u64 multicast)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_chanctx *ctx;
  	u32 rfilt;
  
  	changed_flags &= SUPPORTED_FILTERS;
  	*total_flags &= SUPPORTED_FILTERS;
  
  	spin_lock_bh(&sc->chan_lock);
  	ath_for_each_chanctx(sc, ctx)
  		ctx->rxfilter = *total_flags;
  #ifdef CONFIG_ATH9K_CHANNEL_CONTEXT
  	sc->offchannel.chan.rxfilter = *total_flags;
  #endif
  	spin_unlock_bh(&sc->chan_lock);
  
  	ath9k_ps_wakeup(sc);
  	rfilt = ath_calcrxfilter(sc);
  	ath9k_hw_setrxfilter(sc->sc_ah, rfilt);
  	ath9k_ps_restore(sc);
  
  	ath_dbg(ath9k_hw_common(sc->sc_ah), CONFIG, "Set HW RX filter: 0x%x\n",
  		rfilt);
  }
  
  static int ath9k_sta_add(struct ieee80211_hw *hw,
  			 struct ieee80211_vif *vif,
  			 struct ieee80211_sta *sta)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	struct ath_node *an = (struct ath_node *) sta->drv_priv;
  	struct ieee80211_key_conf ps_key = { };
  	int key;
  
  	ath_node_attach(sc, sta, vif);
  
  	if (vif->type != NL80211_IFTYPE_AP &&
  	    vif->type != NL80211_IFTYPE_AP_VLAN)
  		return 0;
  
  	key = ath_key_config(common, vif, sta, &ps_key);
  	if (key > 0) {
  		an->ps_key = key;
  		an->key_idx[0] = key;
  	}
  
  	return 0;
  }
  
  static void ath9k_del_ps_key(struct ath_softc *sc,
  			     struct ieee80211_vif *vif,
  			     struct ieee80211_sta *sta)
  {
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	struct ath_node *an = (struct ath_node *) sta->drv_priv;
  	struct ieee80211_key_conf ps_key = { .hw_key_idx = an->ps_key };
  
  	if (!an->ps_key)
  	    return;
  
  	ath_key_delete(common, &ps_key);
  	an->ps_key = 0;
  	an->key_idx[0] = 0;
  }
  
  static int ath9k_sta_remove(struct ieee80211_hw *hw,
  			    struct ieee80211_vif *vif,
  			    struct ieee80211_sta *sta)
  {
  	struct ath_softc *sc = hw->priv;
  
  	ath9k_del_ps_key(sc, vif, sta);
  	ath_node_detach(sc, sta);
  
  	return 0;
  }
  
  static int ath9k_sta_state(struct ieee80211_hw *hw,
  			   struct ieee80211_vif *vif,
  			   struct ieee80211_sta *sta,
  			   enum ieee80211_sta_state old_state,
  			   enum ieee80211_sta_state new_state)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	int ret = 0;
  
  	if (old_state == IEEE80211_STA_AUTH &&
  	    new_state == IEEE80211_STA_ASSOC) {
  		ret = ath9k_sta_add(hw, vif, sta);
  		ath_dbg(common, CONFIG,
  			"Add station: %pM\n", sta->addr);
  	} else if (old_state == IEEE80211_STA_ASSOC &&
  		   new_state == IEEE80211_STA_AUTH) {
  		ret = ath9k_sta_remove(hw, vif, sta);
  		ath_dbg(common, CONFIG,
  			"Remove station: %pM\n", sta->addr);
  	}
  
  	if (ath9k_is_chanctx_enabled()) {
  		if (vif->type == NL80211_IFTYPE_STATION) {
  			if (old_state == IEEE80211_STA_ASSOC &&
  			    new_state == IEEE80211_STA_AUTHORIZED)
  				ath_chanctx_event(sc, vif,
  						  ATH_CHANCTX_EVENT_AUTHORIZED);
  		}
  	}
  
  	return ret;
  }
  
  static void ath9k_sta_set_tx_filter(struct ath_hw *ah,
  				    struct ath_node *an,
  				    bool set)
  {
  	int i;
  
  	for (i = 0; i < ARRAY_SIZE(an->key_idx); i++) {
  		if (!an->key_idx[i])
  			continue;
  		ath9k_hw_set_tx_filter(ah, an->key_idx[i], set);
  	}
  }
  
  static void ath9k_sta_notify(struct ieee80211_hw *hw,
  			 struct ieee80211_vif *vif,
  			 enum sta_notify_cmd cmd,
  			 struct ieee80211_sta *sta)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_node *an = (struct ath_node *) sta->drv_priv;
  
  	switch (cmd) {
  	case STA_NOTIFY_SLEEP:
  		an->sleeping = true;
  		ath_tx_aggr_sleep(sta, sc, an);
  		ath9k_sta_set_tx_filter(sc->sc_ah, an, true);
  		break;
  	case STA_NOTIFY_AWAKE:
  		ath9k_sta_set_tx_filter(sc->sc_ah, an, false);
  		an->sleeping = false;
  		ath_tx_aggr_wakeup(sc, an);
  		break;
  	}
  }
  
  static int ath9k_conf_tx(struct ieee80211_hw *hw,
  			 struct ieee80211_vif *vif, u16 queue,
  			 const struct ieee80211_tx_queue_params *params)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	struct ath_txq *txq;
  	struct ath9k_tx_queue_info qi;
  	int ret = 0;
  
  	if (queue >= IEEE80211_NUM_ACS)
  		return 0;
  
  	txq = sc->tx.txq_map[queue];
  
  	ath9k_ps_wakeup(sc);
  	mutex_lock(&sc->mutex);
  
  	memset(&qi, 0, sizeof(struct ath9k_tx_queue_info));
  
  	qi.tqi_aifs = params->aifs;
  	qi.tqi_cwmin = params->cw_min;
  	qi.tqi_cwmax = params->cw_max;
  	qi.tqi_burstTime = params->txop * 32;
  
  	ath_dbg(common, CONFIG,
  		"Configure tx [queue/halq] [%d/%d], aifs: %d, cw_min: %d, cw_max: %d, txop: %d\n",
  		queue, txq->axq_qnum, params->aifs, params->cw_min,
  		params->cw_max, params->txop);
  
  	ath_update_max_aggr_framelen(sc, queue, qi.tqi_burstTime);
  	ret = ath_txq_update(sc, txq->axq_qnum, &qi);
  	if (ret)
  		ath_err(common, "TXQ Update failed\n");
  
  	mutex_unlock(&sc->mutex);
  	ath9k_ps_restore(sc);
  
  	return ret;
  }
  
  static int ath9k_set_key(struct ieee80211_hw *hw,
  			 enum set_key_cmd cmd,
  			 struct ieee80211_vif *vif,
  			 struct ieee80211_sta *sta,
  			 struct ieee80211_key_conf *key)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	struct ath_node *an = NULL;
  	int ret = 0, i;
  
  	if (ath9k_modparam_nohwcrypt)
  		return -ENOSPC;
  
  	if ((vif->type == NL80211_IFTYPE_ADHOC ||
  	     vif->type == NL80211_IFTYPE_MESH_POINT) &&
  	    (key->cipher == WLAN_CIPHER_SUITE_TKIP ||
  	     key->cipher == WLAN_CIPHER_SUITE_CCMP) &&
  	    !(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
  		/*
  		 * For now, disable hw crypto for the RSN IBSS group keys. This
  		 * could be optimized in the future to use a modified key cache
  		 * design to support per-STA RX GTK, but until that gets
  		 * implemented, use of software crypto for group addressed
  		 * frames is a acceptable to allow RSN IBSS to be used.
  		 */
  		return -EOPNOTSUPP;
  	}
  
  	mutex_lock(&sc->mutex);
  	ath9k_ps_wakeup(sc);
  	ath_dbg(common, CONFIG, "Set HW Key %d\n", cmd);
  	if (sta)
  		an = (struct ath_node *)sta->drv_priv;
  
  	switch (cmd) {
  	case SET_KEY:
  		if (sta)
  			ath9k_del_ps_key(sc, vif, sta);
  
  		key->hw_key_idx = 0;
  		ret = ath_key_config(common, vif, sta, key);
  		if (ret >= 0) {
  			key->hw_key_idx = ret;
  			/* push IV and Michael MIC generation to stack */
  			key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
  			if (key->cipher == WLAN_CIPHER_SUITE_TKIP)
  				key->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
  			if (sc->sc_ah->sw_mgmt_crypto_tx &&
  			    key->cipher == WLAN_CIPHER_SUITE_CCMP)
  				key->flags |= IEEE80211_KEY_FLAG_SW_MGMT_TX;
  			ret = 0;
  		}
  		if (an && key->hw_key_idx) {
  			for (i = 0; i < ARRAY_SIZE(an->key_idx); i++) {
  				if (an->key_idx[i])
  					continue;
  				an->key_idx[i] = key->hw_key_idx;
  				break;
  			}
  			WARN_ON(i == ARRAY_SIZE(an->key_idx));
  		}
  		break;
  	case DISABLE_KEY:
  		ath_key_delete(common, key);
  		if (an) {
  			for (i = 0; i < ARRAY_SIZE(an->key_idx); i++) {
  				if (an->key_idx[i] != key->hw_key_idx)
  					continue;
  				an->key_idx[i] = 0;
  				break;
  			}
  		}
  		key->hw_key_idx = 0;
  		break;
  	default:
  		ret = -EINVAL;
  	}
  
  	ath9k_ps_restore(sc);
  	mutex_unlock(&sc->mutex);
  
  	return ret;
  }
  
  static void ath9k_bss_info_changed(struct ieee80211_hw *hw,
  				   struct ieee80211_vif *vif,
  				   struct ieee80211_bss_conf *bss_conf,
  				   u32 changed)
  {
  #define CHECK_ANI				\
  	(BSS_CHANGED_ASSOC |			\
  	 BSS_CHANGED_IBSS |			\
  	 BSS_CHANGED_BEACON_ENABLED)
  
  	struct ath_softc *sc = hw->priv;
  	struct ath_hw *ah = sc->sc_ah;
  	struct ath_common *common = ath9k_hw_common(ah);
  	struct ath_vif *avp = (void *)vif->drv_priv;
  	int slottime;
  
  	ath9k_ps_wakeup(sc);
  	mutex_lock(&sc->mutex);
  
  	if (changed & BSS_CHANGED_ASSOC) {
  		ath_dbg(common, CONFIG, "BSSID %pM Changed ASSOC %d\n",
  			bss_conf->bssid, bss_conf->assoc);
  
  		memcpy(avp->bssid, bss_conf->bssid, ETH_ALEN);
  		avp->aid = bss_conf->aid;
  		avp->assoc = bss_conf->assoc;
  
  		ath9k_calculate_summary_state(sc, avp->chanctx);
  	}
  
  	if ((changed & BSS_CHANGED_IBSS) ||
  	      (changed & BSS_CHANGED_OCB)) {
  		memcpy(common->curbssid, bss_conf->bssid, ETH_ALEN);
  		common->curaid = bss_conf->aid;
  		ath9k_hw_write_associd(sc->sc_ah);
  	}
  
  	if ((changed & BSS_CHANGED_BEACON_ENABLED) ||
  	    (changed & BSS_CHANGED_BEACON_INT) ||
  	    (changed & BSS_CHANGED_BEACON_INFO)) {
  		ath9k_beacon_config(sc, vif, changed);
  		if (changed & BSS_CHANGED_BEACON_ENABLED)
  			ath9k_calculate_summary_state(sc, avp->chanctx);
  	}
  
  	if ((avp->chanctx == sc->cur_chan) &&
  	    (changed & BSS_CHANGED_ERP_SLOT)) {
  		if (bss_conf->use_short_slot)
  			slottime = 9;
  		else
  			slottime = 20;
  		if (vif->type == NL80211_IFTYPE_AP) {
  			/*
  			 * Defer update, so that connected stations can adjust
  			 * their settings at the same time.
  			 * See beacon.c for more details
  			 */
  			sc->beacon.slottime = slottime;
  			sc->beacon.updateslot = UPDATE;
  		} else {
  			ah->slottime = slottime;
  			ath9k_hw_init_global_settings(ah);
  		}
  	}
  
  	if (changed & BSS_CHANGED_P2P_PS)
  		ath9k_p2p_bss_info_changed(sc, vif);
  
  	if (changed & CHECK_ANI)
  		ath_check_ani(sc);
  
  	if (changed & BSS_CHANGED_TXPOWER) {
  		ath_dbg(common, CONFIG, "vif %pM power %d dbm power_type %d\n",
  			vif->addr, bss_conf->txpower, bss_conf->txpower_type);
  		ath9k_set_txpower(sc, vif);
  	}
  
  	mutex_unlock(&sc->mutex);
  	ath9k_ps_restore(sc);
  
  #undef CHECK_ANI
  }
  
  static u64 ath9k_get_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
  {
  	struct ath_softc *sc = hw->priv;
  	u64 tsf;
  
  	mutex_lock(&sc->mutex);
  	ath9k_ps_wakeup(sc);
  	tsf = ath9k_hw_gettsf64(sc->sc_ah);
  	ath9k_ps_restore(sc);
  	mutex_unlock(&sc->mutex);
  
  	return tsf;
  }
  
  static void ath9k_set_tsf(struct ieee80211_hw *hw,
  			  struct ieee80211_vif *vif,
  			  u64 tsf)
  {
  	struct ath_softc *sc = hw->priv;
  
  	mutex_lock(&sc->mutex);
  	ath9k_ps_wakeup(sc);
  	ath9k_hw_settsf64(sc->sc_ah, tsf);
  	ath9k_ps_restore(sc);
  	mutex_unlock(&sc->mutex);
  }
  
  static void ath9k_reset_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
  {
  	struct ath_softc *sc = hw->priv;
  
  	mutex_lock(&sc->mutex);
  
  	ath9k_ps_wakeup(sc);
  	ath9k_hw_reset_tsf(sc->sc_ah);
  	ath9k_ps_restore(sc);
  
  	mutex_unlock(&sc->mutex);
  }
  
  static int ath9k_ampdu_action(struct ieee80211_hw *hw,
  			      struct ieee80211_vif *vif,
  			      enum ieee80211_ampdu_mlme_action action,
  			      struct ieee80211_sta *sta,
  			      u16 tid, u16 *ssn, u8 buf_size, bool amsdu)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	bool flush = false;
  	int ret = 0;
  
  	mutex_lock(&sc->mutex);
  
  	switch (action) {
  	case IEEE80211_AMPDU_RX_START:
  		break;
  	case IEEE80211_AMPDU_RX_STOP:
  		break;
  	case IEEE80211_AMPDU_TX_START:
  		if (ath9k_is_chanctx_enabled()) {
  			if (test_bit(ATH_OP_SCANNING, &common->op_flags)) {
  				ret = -EBUSY;
  				break;
  			}
  		}
  		ath9k_ps_wakeup(sc);
  		ret = ath_tx_aggr_start(sc, sta, tid, ssn);
  		if (!ret)
  			ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
  		ath9k_ps_restore(sc);
  		break;
  	case IEEE80211_AMPDU_TX_STOP_FLUSH:
  	case IEEE80211_AMPDU_TX_STOP_FLUSH_CONT:
  		flush = true;
  	case IEEE80211_AMPDU_TX_STOP_CONT:
  		ath9k_ps_wakeup(sc);
  		ath_tx_aggr_stop(sc, sta, tid);
  		if (!flush)
  			ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
  		ath9k_ps_restore(sc);
  		break;
  	case IEEE80211_AMPDU_TX_OPERATIONAL:
  		ath9k_ps_wakeup(sc);
  		ath_tx_aggr_resume(sc, sta, tid);
  		ath9k_ps_restore(sc);
  		break;
  	default:
  		ath_err(ath9k_hw_common(sc->sc_ah), "Unknown AMPDU action\n");
  	}
  
  	mutex_unlock(&sc->mutex);
  
  	return ret;
  }
  
  static int ath9k_get_survey(struct ieee80211_hw *hw, int idx,
  			     struct survey_info *survey)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	struct ieee80211_supported_band *sband;
  	struct ieee80211_channel *chan;
  	int pos;
  
  	if (config_enabled(CONFIG_ATH9K_TX99))
  		return -EOPNOTSUPP;
  
  	spin_lock_bh(&common->cc_lock);
  	if (idx == 0)
  		ath_update_survey_stats(sc);
  
  	sband = hw->wiphy->bands[IEEE80211_BAND_2GHZ];
  	if (sband && idx >= sband->n_channels) {
  		idx -= sband->n_channels;
  		sband = NULL;
  	}
  
  	if (!sband)
  		sband = hw->wiphy->bands[IEEE80211_BAND_5GHZ];
  
  	if (!sband || idx >= sband->n_channels) {
  		spin_unlock_bh(&common->cc_lock);
  		return -ENOENT;
  	}
  
  	chan = &sband->channels[idx];
  	pos = chan->hw_value;
  	memcpy(survey, &sc->survey[pos], sizeof(*survey));
  	survey->channel = chan;
  	spin_unlock_bh(&common->cc_lock);
  
  	return 0;
  }
  
  static void ath9k_enable_dynack(struct ath_softc *sc)
  {
  #ifdef CONFIG_ATH9K_DYNACK
  	u32 rfilt;
  	struct ath_hw *ah = sc->sc_ah;
  
  	ath_dynack_reset(ah);
  
  	ah->dynack.enabled = true;
  	rfilt = ath_calcrxfilter(sc);
  	ath9k_hw_setrxfilter(ah, rfilt);
  #endif
  }
  
  static void ath9k_set_coverage_class(struct ieee80211_hw *hw,
  				     s16 coverage_class)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_hw *ah = sc->sc_ah;
  
  	if (config_enabled(CONFIG_ATH9K_TX99))
  		return;
  
  	mutex_lock(&sc->mutex);
  
  	if (coverage_class >= 0) {
  		ah->coverage_class = coverage_class;
  		if (ah->dynack.enabled) {
  			u32 rfilt;
  
  			ah->dynack.enabled = false;
  			rfilt = ath_calcrxfilter(sc);
  			ath9k_hw_setrxfilter(ah, rfilt);
  		}
  		ath9k_ps_wakeup(sc);
  		ath9k_hw_init_global_settings(ah);
  		ath9k_ps_restore(sc);
  	} else if (!ah->dynack.enabled) {
  		ath9k_enable_dynack(sc);
  	}
  
  	mutex_unlock(&sc->mutex);
  }
  
  static bool ath9k_has_tx_pending(struct ath_softc *sc,
  				 bool sw_pending)
  {
  	int i, npend = 0;
  
  	for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
  		if (!ATH_TXQ_SETUP(sc, i))
  			continue;
  
  		npend = ath9k_has_pending_frames(sc, &sc->tx.txq[i],
  						 sw_pending);
  		if (npend)
  			break;
  	}
  
  	return !!npend;
  }
  
  static void ath9k_flush(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
  			u32 queues, bool drop)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  
  	if (ath9k_is_chanctx_enabled()) {
  		if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags))
  			goto flush;
  
  		/*
  		 * If MCC is active, extend the flush timeout
  		 * and wait for the HW/SW queues to become
  		 * empty. This needs to be done outside the
  		 * sc->mutex lock to allow the channel scheduler
  		 * to switch channel contexts.
  		 *
  		 * The vif queues have been stopped in mac80211,
  		 * so there won't be any incoming frames.
  		 */
  		__ath9k_flush(hw, queues, drop, true, true);
  		return;
  	}
  flush:
  	mutex_lock(&sc->mutex);
  	__ath9k_flush(hw, queues, drop, true, false);
  	mutex_unlock(&sc->mutex);
  }
  
  void __ath9k_flush(struct ieee80211_hw *hw, u32 queues, bool drop,
  		   bool sw_pending, bool timeout_override)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_hw *ah = sc->sc_ah;
  	struct ath_common *common = ath9k_hw_common(ah);
  	int timeout;
  	bool drain_txq;
  
  	cancel_delayed_work_sync(&sc->tx_complete_work);
  
  	if (ah->ah_flags & AH_UNPLUGGED) {
  		ath_dbg(common, ANY, "Device has been unplugged!\n");
  		return;
  	}
  
  	if (test_bit(ATH_OP_INVALID, &common->op_flags)) {
  		ath_dbg(common, ANY, "Device not present\n");
  		return;
  	}
  
  	spin_lock_bh(&sc->chan_lock);
  	if (timeout_override)
  		timeout = HZ / 5;
  	else
  		timeout = sc->cur_chan->flush_timeout;
  	spin_unlock_bh(&sc->chan_lock);
  
  	ath_dbg(common, CHAN_CTX,
  		"Flush timeout: %d\n", jiffies_to_msecs(timeout));
  
  	if (wait_event_timeout(sc->tx_wait, !ath9k_has_tx_pending(sc, sw_pending),
  			       timeout) > 0)
  		drop = false;
  
  	if (drop) {
  		ath9k_ps_wakeup(sc);
  		spin_lock_bh(&sc->sc_pcu_lock);
  		drain_txq = ath_drain_all_txq(sc);
  		spin_unlock_bh(&sc->sc_pcu_lock);
  
  		if (!drain_txq)
  			ath_reset(sc, NULL);
  
  		ath9k_ps_restore(sc);
  	}
  
  	ieee80211_queue_delayed_work(hw, &sc->tx_complete_work, 0);
  }
  
  static bool ath9k_tx_frames_pending(struct ieee80211_hw *hw)
  {
  	struct ath_softc *sc = hw->priv;
  
  	return ath9k_has_tx_pending(sc, true);
  }
  
  static int ath9k_tx_last_beacon(struct ieee80211_hw *hw)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_hw *ah = sc->sc_ah;
  	struct ieee80211_vif *vif;
  	struct ath_vif *avp;
  	struct ath_buf *bf;
  	struct ath_tx_status ts;
  	bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
  	int status;
  
  	vif = sc->beacon.bslot[0];
  	if (!vif)
  		return 0;
  
  	if (!vif->bss_conf.enable_beacon)
  		return 0;
  
  	avp = (void *)vif->drv_priv;
  
  	if (!sc->beacon.tx_processed && !edma) {
  		tasklet_disable(&sc->bcon_tasklet);
  
  		bf = avp->av_bcbuf;
  		if (!bf || !bf->bf_mpdu)
  			goto skip;
  
  		status = ath9k_hw_txprocdesc(ah, bf->bf_desc, &ts);
  		if (status == -EINPROGRESS)
  			goto skip;
  
  		sc->beacon.tx_processed = true;
  		sc->beacon.tx_last = !(ts.ts_status & ATH9K_TXERR_MASK);
  
  skip:
  		tasklet_enable(&sc->bcon_tasklet);
  	}
  
  	return sc->beacon.tx_last;
  }
  
  static int ath9k_get_stats(struct ieee80211_hw *hw,
  			   struct ieee80211_low_level_stats *stats)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_hw *ah = sc->sc_ah;
  	struct ath9k_mib_stats *mib_stats = &ah->ah_mibStats;
  
  	stats->dot11ACKFailureCount = mib_stats->ackrcv_bad;
  	stats->dot11RTSFailureCount = mib_stats->rts_bad;
  	stats->dot11FCSErrorCount = mib_stats->fcs_bad;
  	stats->dot11RTSSuccessCount = mib_stats->rts_good;
  	return 0;
  }
  
  static u32 fill_chainmask(u32 cap, u32 new)
  {
  	u32 filled = 0;
  	int i;
  
  	for (i = 0; cap && new; i++, cap >>= 1) {
  		if (!(cap & BIT(0)))
  			continue;
  
  		if (new & BIT(0))
  			filled |= BIT(i);
  
  		new >>= 1;
  	}
  
  	return filled;
  }
  
  static bool validate_antenna_mask(struct ath_hw *ah, u32 val)
  {
  	if (AR_SREV_9300_20_OR_LATER(ah))
  		return true;
  
  	switch (val & 0x7) {
  	case 0x1:
  	case 0x3:
  	case 0x7:
  		return true;
  	case 0x2:
  		return (ah->caps.rx_chainmask == 1);
  	default:
  		return false;
  	}
  }
  
  static int ath9k_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_hw *ah = sc->sc_ah;
  
  	if (ah->caps.rx_chainmask != 1)
  		rx_ant |= tx_ant;
  
  	if (!validate_antenna_mask(ah, rx_ant) || !tx_ant)
  		return -EINVAL;
  
  	sc->ant_rx = rx_ant;
  	sc->ant_tx = tx_ant;
  
  	if (ah->caps.rx_chainmask == 1)
  		return 0;
  
  	/* AR9100 runs into calibration issues if not all rx chains are enabled */
  	if (AR_SREV_9100(ah))
  		ah->rxchainmask = 0x7;
  	else
  		ah->rxchainmask = fill_chainmask(ah->caps.rx_chainmask, rx_ant);
  
  	ah->txchainmask = fill_chainmask(ah->caps.tx_chainmask, tx_ant);
  	ath9k_cmn_reload_chainmask(ah);
  
  	return 0;
  }
  
  static int ath9k_get_antenna(struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant)
  {
  	struct ath_softc *sc = hw->priv;
  
  	*tx_ant = sc->ant_tx;
  	*rx_ant = sc->ant_rx;
  	return 0;
  }
  
  static void ath9k_sw_scan_start(struct ieee80211_hw *hw,
  				struct ieee80211_vif *vif,
  				const u8 *mac_addr)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	set_bit(ATH_OP_SCANNING, &common->op_flags);
  }
  
  static void ath9k_sw_scan_complete(struct ieee80211_hw *hw,
  				   struct ieee80211_vif *vif)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	clear_bit(ATH_OP_SCANNING, &common->op_flags);
  }
  
  #ifdef CONFIG_ATH9K_CHANNEL_CONTEXT
  
  static void ath9k_cancel_pending_offchannel(struct ath_softc *sc)
  {
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  
  	if (sc->offchannel.roc_vif) {
  		ath_dbg(common, CHAN_CTX,
  			"%s: Aborting RoC\n", __func__);
  
  		del_timer_sync(&sc->offchannel.timer);
  		if (sc->offchannel.state >= ATH_OFFCHANNEL_ROC_START)
  			ath_roc_complete(sc, ATH_ROC_COMPLETE_ABORT);
  	}
  
  	if (test_bit(ATH_OP_SCANNING, &common->op_flags)) {
  		ath_dbg(common, CHAN_CTX,
  			"%s: Aborting HW scan\n", __func__);
  
  		del_timer_sync(&sc->offchannel.timer);
  		ath_scan_complete(sc, true);
  	}
  }
  
  static int ath9k_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
  			 struct ieee80211_scan_request *hw_req)
  {
  	struct cfg80211_scan_request *req = &hw_req->req;
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	int ret = 0;
  
  	mutex_lock(&sc->mutex);
  
  	if (WARN_ON(sc->offchannel.scan_req)) {
  		ret = -EBUSY;
  		goto out;
  	}
  
  	ath9k_ps_wakeup(sc);
  	set_bit(ATH_OP_SCANNING, &common->op_flags);
  	sc->offchannel.scan_vif = vif;
  	sc->offchannel.scan_req = req;
  	sc->offchannel.scan_idx = 0;
  
  	ath_dbg(common, CHAN_CTX, "HW scan request received on vif: %pM\n",
  		vif->addr);
  
  	if (sc->offchannel.state == ATH_OFFCHANNEL_IDLE) {
  		ath_dbg(common, CHAN_CTX, "Starting HW scan\n");
  		ath_offchannel_next(sc);
  	}
  
  out:
  	mutex_unlock(&sc->mutex);
  
  	return ret;
  }
  
  static void ath9k_cancel_hw_scan(struct ieee80211_hw *hw,
  				 struct ieee80211_vif *vif)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  
  	ath_dbg(common, CHAN_CTX, "Cancel HW scan on vif: %pM\n", vif->addr);
  
  	mutex_lock(&sc->mutex);
  	del_timer_sync(&sc->offchannel.timer);
  	ath_scan_complete(sc, true);
  	mutex_unlock(&sc->mutex);
  }
  
  static int ath9k_remain_on_channel(struct ieee80211_hw *hw,
  				   struct ieee80211_vif *vif,
  				   struct ieee80211_channel *chan, int duration,
  				   enum ieee80211_roc_type type)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	int ret = 0;
  
  	mutex_lock(&sc->mutex);
  
  	if (WARN_ON(sc->offchannel.roc_vif)) {
  		ret = -EBUSY;
  		goto out;
  	}
  
  	ath9k_ps_wakeup(sc);
  	sc->offchannel.roc_vif = vif;
  	sc->offchannel.roc_chan = chan;
  	sc->offchannel.roc_duration = duration;
  
  	ath_dbg(common, CHAN_CTX,
  		"RoC request on vif: %pM, type: %d duration: %d\n",
  		vif->addr, type, duration);
  
  	if (sc->offchannel.state == ATH_OFFCHANNEL_IDLE) {
  		ath_dbg(common, CHAN_CTX, "Starting RoC period\n");
  		ath_offchannel_next(sc);
  	}
  
  out:
  	mutex_unlock(&sc->mutex);
  
  	return ret;
  }
  
  static int ath9k_cancel_remain_on_channel(struct ieee80211_hw *hw)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  
  	mutex_lock(&sc->mutex);
  
  	ath_dbg(common, CHAN_CTX, "Cancel RoC\n");
  	del_timer_sync(&sc->offchannel.timer);
  
  	if (sc->offchannel.roc_vif) {
  		if (sc->offchannel.state >= ATH_OFFCHANNEL_ROC_START)
  			ath_roc_complete(sc, ATH_ROC_COMPLETE_CANCEL);
  	}
  
  	mutex_unlock(&sc->mutex);
  
  	return 0;
  }
  
  static int ath9k_add_chanctx(struct ieee80211_hw *hw,
  			     struct ieee80211_chanctx_conf *conf)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	struct ath_chanctx *ctx, **ptr;
  	int pos;
  
  	mutex_lock(&sc->mutex);
  
  	ath_for_each_chanctx(sc, ctx) {
  		if (ctx->assigned)
  			continue;
  
  		ptr = (void *) conf->drv_priv;
  		*ptr = ctx;
  		ctx->assigned = true;
  		pos = ctx - &sc->chanctx[0];
  		ctx->hw_queue_base = pos * IEEE80211_NUM_ACS;
  
  		ath_dbg(common, CHAN_CTX,
  			"Add channel context: %d MHz\n",
  			conf->def.chan->center_freq);
  
  		ath_chanctx_set_channel(sc, ctx, &conf->def);
  
  		mutex_unlock(&sc->mutex);
  		return 0;
  	}
  
  	mutex_unlock(&sc->mutex);
  	return -ENOSPC;
  }
  
  
  static void ath9k_remove_chanctx(struct ieee80211_hw *hw,
  				 struct ieee80211_chanctx_conf *conf)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	struct ath_chanctx *ctx = ath_chanctx_get(conf);
  
  	mutex_lock(&sc->mutex);
  
  	ath_dbg(common, CHAN_CTX,
  		"Remove channel context: %d MHz\n",
  		conf->def.chan->center_freq);
  
  	ctx->assigned = false;
  	ctx->hw_queue_base = 0;
  	ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_UNASSIGN);
  
  	mutex_unlock(&sc->mutex);
  }
  
  static void ath9k_change_chanctx(struct ieee80211_hw *hw,
  				 struct ieee80211_chanctx_conf *conf,
  				 u32 changed)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	struct ath_chanctx *ctx = ath_chanctx_get(conf);
  
  	mutex_lock(&sc->mutex);
  	ath_dbg(common, CHAN_CTX,
  		"Change channel context: %d MHz\n",
  		conf->def.chan->center_freq);
  	ath_chanctx_set_channel(sc, ctx, &conf->def);
  	mutex_unlock(&sc->mutex);
  }
  
  static int ath9k_assign_vif_chanctx(struct ieee80211_hw *hw,
  				    struct ieee80211_vif *vif,
  				    struct ieee80211_chanctx_conf *conf)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	struct ath_vif *avp = (void *)vif->drv_priv;
  	struct ath_chanctx *ctx = ath_chanctx_get(conf);
  	int i;
  
  	ath9k_cancel_pending_offchannel(sc);
  
  	mutex_lock(&sc->mutex);
  
  	ath_dbg(common, CHAN_CTX,
  		"Assign VIF (addr: %pM, type: %d, p2p: %d) to channel context: %d MHz\n",
  		vif->addr, vif->type, vif->p2p,
  		conf->def.chan->center_freq);
  
  	avp->chanctx = ctx;
  	ctx->nvifs_assigned++;
  	list_add_tail(&avp->list, &ctx->vifs);
  	ath9k_calculate_summary_state(sc, ctx);
  	for (i = 0; i < IEEE80211_NUM_ACS; i++)
  		vif->hw_queue[i] = ctx->hw_queue_base + i;
  
  	mutex_unlock(&sc->mutex);
  
  	return 0;
  }
  
  static void ath9k_unassign_vif_chanctx(struct ieee80211_hw *hw,
  				       struct ieee80211_vif *vif,
  				       struct ieee80211_chanctx_conf *conf)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	struct ath_vif *avp = (void *)vif->drv_priv;
  	struct ath_chanctx *ctx = ath_chanctx_get(conf);
  	int ac;
  
  	ath9k_cancel_pending_offchannel(sc);
  
  	mutex_lock(&sc->mutex);
  
  	ath_dbg(common, CHAN_CTX,
  		"Remove VIF (addr: %pM, type: %d, p2p: %d) from channel context: %d MHz\n",
  		vif->addr, vif->type, vif->p2p,
  		conf->def.chan->center_freq);
  
  	avp->chanctx = NULL;
  	ctx->nvifs_assigned--;
  	list_del(&avp->list);
  	ath9k_calculate_summary_state(sc, ctx);
  	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
  		vif->hw_queue[ac] = IEEE80211_INVAL_HW_QUEUE;
  
  	mutex_unlock(&sc->mutex);
  }
  
  static void ath9k_mgd_prepare_tx(struct ieee80211_hw *hw,
  				 struct ieee80211_vif *vif)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  	struct ath_vif *avp = (struct ath_vif *) vif->drv_priv;
  	struct ath_beacon_config *cur_conf;
  	struct ath_chanctx *go_ctx;
  	unsigned long timeout;
  	bool changed = false;
  	u32 beacon_int;
  
  	if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags))
  		return;
  
  	if (!avp->chanctx)
  		return;
  
  	mutex_lock(&sc->mutex);
  
  	spin_lock_bh(&sc->chan_lock);
  	if (sc->next_chan || (sc->cur_chan != avp->chanctx))
  		changed = true;
  	spin_unlock_bh(&sc->chan_lock);
  
  	if (!changed)
  		goto out;
  
  	ath9k_cancel_pending_offchannel(sc);
  
  	go_ctx = ath_is_go_chanctx_present(sc);
  
  	if (go_ctx) {
  		/*
  		 * Wait till the GO interface gets a chance
  		 * to send out an NoA.
  		 */
  		spin_lock_bh(&sc->chan_lock);
  		sc->sched.mgd_prepare_tx = true;
  		cur_conf = &go_ctx->beacon;
  		beacon_int = TU_TO_USEC(cur_conf->beacon_interval);
  		spin_unlock_bh(&sc->chan_lock);
  
  		timeout = usecs_to_jiffies(beacon_int * 2);
  		init_completion(&sc->go_beacon);
  
  		mutex_unlock(&sc->mutex);
  
  		if (wait_for_completion_timeout(&sc->go_beacon,
  						timeout) == 0) {
  			ath_dbg(common, CHAN_CTX,
  				"Failed to send new NoA\n");
  
  			spin_lock_bh(&sc->chan_lock);
  			sc->sched.mgd_prepare_tx = false;
  			spin_unlock_bh(&sc->chan_lock);
  		}
  
  		mutex_lock(&sc->mutex);
  	}
  
  	ath_dbg(common, CHAN_CTX,
  		"%s: Set chanctx state to FORCE_ACTIVE for vif: %pM\n",
  		__func__, vif->addr);
  
  	spin_lock_bh(&sc->chan_lock);
  	sc->next_chan = avp->chanctx;
  	sc->sched.state = ATH_CHANCTX_STATE_FORCE_ACTIVE;
  	spin_unlock_bh(&sc->chan_lock);
  
  	ath_chanctx_set_next(sc, true);
  out:
  	mutex_unlock(&sc->mutex);
  }
  
  void ath9k_fill_chanctx_ops(void)
  {
  	if (!ath9k_is_chanctx_enabled())
  		return;
  
  	ath9k_ops.hw_scan                  = ath9k_hw_scan;
  	ath9k_ops.cancel_hw_scan           = ath9k_cancel_hw_scan;
  	ath9k_ops.remain_on_channel        = ath9k_remain_on_channel;
  	ath9k_ops.cancel_remain_on_channel = ath9k_cancel_remain_on_channel;
  	ath9k_ops.add_chanctx              = ath9k_add_chanctx;
  	ath9k_ops.remove_chanctx           = ath9k_remove_chanctx;
  	ath9k_ops.change_chanctx           = ath9k_change_chanctx;
  	ath9k_ops.assign_vif_chanctx       = ath9k_assign_vif_chanctx;
  	ath9k_ops.unassign_vif_chanctx     = ath9k_unassign_vif_chanctx;
  	ath9k_ops.mgd_prepare_tx           = ath9k_mgd_prepare_tx;
  }
  
  #endif
  
  static int ath9k_get_txpower(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
  			     int *dbm)
  {
  	struct ath_softc *sc = hw->priv;
  	struct ath_vif *avp = (void *)vif->drv_priv;
  
  	mutex_lock(&sc->mutex);
  	if (avp->chanctx)
  		*dbm = avp->chanctx->cur_txpower;
  	else
  		*dbm = sc->cur_chan->cur_txpower;
  	mutex_unlock(&sc->mutex);
  
  	*dbm /= 2;
  
  	return 0;
  }
  
  struct ieee80211_ops ath9k_ops = {
  	.tx 		    = ath9k_tx,
  	.start 		    = ath9k_start,
  	.stop 		    = ath9k_stop,
  	.add_interface 	    = ath9k_add_interface,
  	.change_interface   = ath9k_change_interface,
  	.remove_interface   = ath9k_remove_interface,
  	.config 	    = ath9k_config,
  	.configure_filter   = ath9k_configure_filter,
  	.sta_state          = ath9k_sta_state,
  	.sta_notify         = ath9k_sta_notify,
  	.conf_tx 	    = ath9k_conf_tx,
  	.bss_info_changed   = ath9k_bss_info_changed,
  	.set_key            = ath9k_set_key,
  	.get_tsf 	    = ath9k_get_tsf,
  	.set_tsf 	    = ath9k_set_tsf,
  	.reset_tsf 	    = ath9k_reset_tsf,
  	.ampdu_action       = ath9k_ampdu_action,
  	.get_survey	    = ath9k_get_survey,
  	.rfkill_poll        = ath9k_rfkill_poll_state,
  	.set_coverage_class = ath9k_set_coverage_class,
  	.flush		    = ath9k_flush,
  	.tx_frames_pending  = ath9k_tx_frames_pending,
  	.tx_last_beacon     = ath9k_tx_last_beacon,
  	.release_buffered_frames = ath9k_release_buffered_frames,
  	.get_stats	    = ath9k_get_stats,
  	.set_antenna	    = ath9k_set_antenna,
  	.get_antenna	    = ath9k_get_antenna,
  
  #ifdef CONFIG_ATH9K_WOW
  	.suspend	    = ath9k_suspend,
  	.resume		    = ath9k_resume,
  	.set_wakeup	    = ath9k_set_wakeup,
  #endif
  
  #ifdef CONFIG_ATH9K_DEBUGFS
  	.get_et_sset_count  = ath9k_get_et_sset_count,
  	.get_et_stats       = ath9k_get_et_stats,
  	.get_et_strings     = ath9k_get_et_strings,
  #endif
  
  #if defined(CONFIG_MAC80211_DEBUGFS) && defined(CONFIG_ATH9K_STATION_STATISTICS)
  	.sta_add_debugfs    = ath9k_sta_add_debugfs,
  #endif
  	.sw_scan_start	    = ath9k_sw_scan_start,
  	.sw_scan_complete   = ath9k_sw_scan_complete,
  	.get_txpower        = ath9k_get_txpower,
  };
  