atheros: put atheros wireless drivers into ath/

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 662 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/virtual.c b/drivers/net/wireless/ath/ath9k/virtual.c
new file mode 100644
index 00000000000..1ff429b027d
--- /dev/null
+++ b/drivers/net/wireless/ath/ath9k/virtual.c
@@ -0,0 +1,662 @@
+/*
+ * Copyright (c) 2008-2009 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 "ath9k.h"
+
+struct ath9k_vif_iter_data {
+	int count;
+	u8 *addr;
+};
+
+static void ath9k_vif_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
+{
+	struct ath9k_vif_iter_data *iter_data = data;
+	u8 *nbuf;
+
+	nbuf = krealloc(iter_data->addr, (iter_data->count + 1) * ETH_ALEN,
+			GFP_ATOMIC);
+	if (nbuf == NULL)
+		return;
+
+	memcpy(nbuf + iter_data->count * ETH_ALEN, mac, ETH_ALEN);
+	iter_data->addr = nbuf;
+	iter_data->count++;
+}
+
+void ath9k_set_bssid_mask(struct ieee80211_hw *hw)
+{
+	struct ath_wiphy *aphy = hw->priv;
+	struct ath_softc *sc = aphy->sc;
+	struct ath9k_vif_iter_data iter_data;
+	int i, j;
+	u8 mask[ETH_ALEN];
+
+	/*
+	 * Add primary MAC address even if it is not in active use since it
+	 * will be configured to the hardware as the starting point and the
+	 * BSSID mask will need to be changed if another address is active.
+	 */
+	iter_data.addr = kmalloc(ETH_ALEN, GFP_ATOMIC);
+	if (iter_data.addr) {
+		memcpy(iter_data.addr, sc->sc_ah->macaddr, ETH_ALEN);
+		iter_data.count = 1;
+	} else
+		iter_data.count = 0;
+
+	/* Get list of all active MAC addresses */
+	spin_lock_bh(&sc->wiphy_lock);
+	ieee80211_iterate_active_interfaces_atomic(sc->hw, ath9k_vif_iter,
+						   &iter_data);
+	for (i = 0; i < sc->num_sec_wiphy; i++) {
+		if (sc->sec_wiphy[i] == NULL)
+			continue;
+		ieee80211_iterate_active_interfaces_atomic(
+			sc->sec_wiphy[i]->hw, ath9k_vif_iter, &iter_data);
+	}
+	spin_unlock_bh(&sc->wiphy_lock);
+
+	/* Generate an address mask to cover all active addresses */
+	memset(mask, 0, ETH_ALEN);
+	for (i = 0; i < iter_data.count; i++) {
+		u8 *a1 = iter_data.addr + i * ETH_ALEN;
+		for (j = i + 1; j < iter_data.count; j++) {
+			u8 *a2 = iter_data.addr + j * ETH_ALEN;
+			mask[0] |= a1[0] ^ a2[0];
+			mask[1] |= a1[1] ^ a2[1];
+			mask[2] |= a1[2] ^ a2[2];
+			mask[3] |= a1[3] ^ a2[3];
+			mask[4] |= a1[4] ^ a2[4];
+			mask[5] |= a1[5] ^ a2[5];
+		}
+	}
+
+	kfree(iter_data.addr);
+
+	/* Invert the mask and configure hardware */
+	sc->bssidmask[0] = ~mask[0];
+	sc->bssidmask[1] = ~mask[1];
+	sc->bssidmask[2] = ~mask[2];
+	sc->bssidmask[3] = ~mask[3];
+	sc->bssidmask[4] = ~mask[4];
+	sc->bssidmask[5] = ~mask[5];
+
+	ath9k_hw_setbssidmask(sc);
+}
+
+int ath9k_wiphy_add(struct ath_softc *sc)
+{
+	int i, error;
+	struct ath_wiphy *aphy;
+	struct ieee80211_hw *hw;
+	u8 addr[ETH_ALEN];
+
+	hw = ieee80211_alloc_hw(sizeof(struct ath_wiphy), &ath9k_ops);
+	if (hw == NULL)
+		return -ENOMEM;
+
+	spin_lock_bh(&sc->wiphy_lock);
+	for (i = 0; i < sc->num_sec_wiphy; i++) {
+		if (sc->sec_wiphy[i] == NULL)
+			break;
+	}
+
+	if (i == sc->num_sec_wiphy) {
+		/* No empty slot available; increase array length */
+		struct ath_wiphy **n;
+		n = krealloc(sc->sec_wiphy,
+			     (sc->num_sec_wiphy + 1) *
+			     sizeof(struct ath_wiphy *),
+			     GFP_ATOMIC);
+		if (n == NULL) {
+			spin_unlock_bh(&sc->wiphy_lock);
+			ieee80211_free_hw(hw);
+			return -ENOMEM;
+		}
+		n[i] = NULL;
+		sc->sec_wiphy = n;
+		sc->num_sec_wiphy++;
+	}
+
+	SET_IEEE80211_DEV(hw, sc->dev);
+
+	aphy = hw->priv;
+	aphy->sc = sc;
+	aphy->hw = hw;
+	sc->sec_wiphy[i] = aphy;
+	spin_unlock_bh(&sc->wiphy_lock);
+
+	memcpy(addr, sc->sc_ah->macaddr, ETH_ALEN);
+	addr[0] |= 0x02; /* Locally managed address */
+	/*
+	 * XOR virtual wiphy index into the least significant bits to generate
+	 * a different MAC address for each virtual wiphy.
+	 */
+	addr[5] ^= i & 0xff;
+	addr[4] ^= (i & 0xff00) >> 8;
+	addr[3] ^= (i & 0xff0000) >> 16;
+
+	SET_IEEE80211_PERM_ADDR(hw, addr);
+
+	ath_set_hw_capab(sc, hw);
+
+	error = ieee80211_register_hw(hw);
+
+	if (error == 0) {
+		/* Make sure wiphy scheduler is started (if enabled) */
+		ath9k_wiphy_set_scheduler(sc, sc->wiphy_scheduler_int);
+	}
+
+	return error;
+}
+
+int ath9k_wiphy_del(struct ath_wiphy *aphy)
+{
+	struct ath_softc *sc = aphy->sc;
+	int i;
+
+	spin_lock_bh(&sc->wiphy_lock);
+	for (i = 0; i < sc->num_sec_wiphy; i++) {
+		if (aphy == sc->sec_wiphy[i]) {
+			sc->sec_wiphy[i] = NULL;
+			spin_unlock_bh(&sc->wiphy_lock);
+			ieee80211_unregister_hw(aphy->hw);
+			ieee80211_free_hw(aphy->hw);
+			return 0;
+		}
+	}
+	spin_unlock_bh(&sc->wiphy_lock);
+	return -ENOENT;
+}
+
+static int ath9k_send_nullfunc(struct ath_wiphy *aphy,
+			       struct ieee80211_vif *vif, const u8 *bssid,
+			       int ps)
+{
+	struct ath_softc *sc = aphy->sc;
+	struct ath_tx_control txctl;
+	struct sk_buff *skb;
+	struct ieee80211_hdr *hdr;
+	__le16 fc;
+	struct ieee80211_tx_info *info;
+
+	skb = dev_alloc_skb(24);
+	if (skb == NULL)
+		return -ENOMEM;
+	hdr = (struct ieee80211_hdr *) skb_put(skb, 24);
+	memset(hdr, 0, 24);
+	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
+			 IEEE80211_FCTL_TODS);
+	if (ps)
+		fc |= cpu_to_le16(IEEE80211_FCTL_PM);
+	hdr->frame_control = fc;
+	memcpy(hdr->addr1, bssid, ETH_ALEN);
+	memcpy(hdr->addr2, aphy->hw->wiphy->perm_addr, ETH_ALEN);
+	memcpy(hdr->addr3, bssid, ETH_ALEN);
+
+	info = IEEE80211_SKB_CB(skb);
+	memset(info, 0, sizeof(*info));
+	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS;
+	info->control.vif = vif;
+	info->control.rates[0].idx = 0;
+	info->control.rates[0].count = 4;
+	info->control.rates[1].idx = -1;
+
+	memset(&txctl, 0, sizeof(struct ath_tx_control));
+	txctl.txq = &sc->tx.txq[sc->tx.hwq_map[ATH9K_WME_AC_VO]];
+	txctl.frame_type = ps ? ATH9K_INT_PAUSE : ATH9K_INT_UNPAUSE;
+
+	if (ath_tx_start(aphy->hw, skb, &txctl) != 0)
+		goto exit;
+
+	return 0;
+exit:
+	dev_kfree_skb_any(skb);
+	return -1;
+}
+
+static bool __ath9k_wiphy_pausing(struct ath_softc *sc)
+{
+	int i;
+	if (sc->pri_wiphy->state == ATH_WIPHY_PAUSING)
+		return true;
+	for (i = 0; i < sc->num_sec_wiphy; i++) {
+		if (sc->sec_wiphy[i] &&
+		    sc->sec_wiphy[i]->state == ATH_WIPHY_PAUSING)
+			return true;
+	}
+	return false;
+}
+
+static bool ath9k_wiphy_pausing(struct ath_softc *sc)
+{
+	bool ret;
+	spin_lock_bh(&sc->wiphy_lock);
+	ret = __ath9k_wiphy_pausing(sc);
+	spin_unlock_bh(&sc->wiphy_lock);
+	return ret;
+}
+
+static bool __ath9k_wiphy_scanning(struct ath_softc *sc)
+{
+	int i;
+	if (sc->pri_wiphy->state == ATH_WIPHY_SCAN)
+		return true;
+	for (i = 0; i < sc->num_sec_wiphy; i++) {
+		if (sc->sec_wiphy[i] &&
+		    sc->sec_wiphy[i]->state == ATH_WIPHY_SCAN)
+			return true;
+	}
+	return false;
+}
+
+bool ath9k_wiphy_scanning(struct ath_softc *sc)
+{
+	bool ret;
+	spin_lock_bh(&sc->wiphy_lock);
+	ret = __ath9k_wiphy_scanning(sc);
+	spin_unlock_bh(&sc->wiphy_lock);
+	return ret;
+}
+
+static int __ath9k_wiphy_unpause(struct ath_wiphy *aphy);
+
+/* caller must hold wiphy_lock */
+static void __ath9k_wiphy_unpause_ch(struct ath_wiphy *aphy)
+{
+	if (aphy == NULL)
+		return;
+	if (aphy->chan_idx != aphy->sc->chan_idx)
+		return; /* wiphy not on the selected channel */
+	__ath9k_wiphy_unpause(aphy);
+}
+
+static void ath9k_wiphy_unpause_channel(struct ath_softc *sc)
+{
+	int i;
+	spin_lock_bh(&sc->wiphy_lock);
+	__ath9k_wiphy_unpause_ch(sc->pri_wiphy);
+	for (i = 0; i < sc->num_sec_wiphy; i++)
+		__ath9k_wiphy_unpause_ch(sc->sec_wiphy[i]);
+	spin_unlock_bh(&sc->wiphy_lock);
+}
+
+void ath9k_wiphy_chan_work(struct work_struct *work)
+{
+	struct ath_softc *sc = container_of(work, struct ath_softc, chan_work);
+	struct ath_wiphy *aphy = sc->next_wiphy;
+
+	if (aphy == NULL)
+		return;
+
+	/*
+	 * All pending interfaces paused; ready to change
+	 * channels.
+	 */
+
+	/* Change channels */
+	mutex_lock(&sc->mutex);
+	/* XXX: remove me eventually */
+	ath9k_update_ichannel(sc, aphy->hw,
+			      &sc->sc_ah->channels[sc->chan_idx]);
+	ath_update_chainmask(sc, sc->chan_is_ht);
+	if (ath_set_channel(sc, aphy->hw,
+			    &sc->sc_ah->channels[sc->chan_idx]) < 0) {
+		printk(KERN_DEBUG "ath9k: Failed to set channel for new "
+		       "virtual wiphy\n");
+		mutex_unlock(&sc->mutex);
+		return;
+	}
+	mutex_unlock(&sc->mutex);
+
+	ath9k_wiphy_unpause_channel(sc);
+}
+
+/*
+ * ath9k version of ieee80211_tx_status() for TX frames that are generated
+ * internally in the driver.
+ */
+void ath9k_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
+{
+	struct ath_wiphy *aphy = hw->priv;
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+	struct ath_tx_info_priv *tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
+
+	if (tx_info_priv && tx_info_priv->frame_type == ATH9K_INT_PAUSE &&
+	    aphy->state == ATH_WIPHY_PAUSING) {
+		if (!(info->flags & IEEE80211_TX_STAT_ACK)) {
+			printk(KERN_DEBUG "ath9k: %s: no ACK for pause "
+			       "frame\n", wiphy_name(hw->wiphy));
+			/*
+			 * The AP did not reply; ignore this to allow us to
+			 * continue.
+			 */
+		}
+		aphy->state = ATH_WIPHY_PAUSED;
+		if (!ath9k_wiphy_pausing(aphy->sc)) {
+			/*
+			 * Drop from tasklet to work to allow mutex for channel
+			 * change.
+			 */
+			queue_work(aphy->sc->hw->workqueue,
+				   &aphy->sc->chan_work);
+		}
+	}
+
+	kfree(tx_info_priv);
+	tx_info->rate_driver_data[0] = NULL;
+
+	dev_kfree_skb(skb);
+}
+
+static void ath9k_mark_paused(struct ath_wiphy *aphy)
+{
+	struct ath_softc *sc = aphy->sc;
+	aphy->state = ATH_WIPHY_PAUSED;
+	if (!__ath9k_wiphy_pausing(sc))
+		queue_work(sc->hw->workqueue, &sc->chan_work);
+}
+
+static void ath9k_pause_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
+{
+	struct ath_wiphy *aphy = data;
+	struct ath_vif *avp = (void *) vif->drv_priv;
+
+	switch (vif->type) {
+	case NL80211_IFTYPE_STATION:
+		if (!vif->bss_conf.assoc) {
+			ath9k_mark_paused(aphy);
+			break;
+		}
+		/* TODO: could avoid this if already in PS mode */
+		if (ath9k_send_nullfunc(aphy, vif, avp->bssid, 1)) {
+			printk(KERN_DEBUG "%s: failed to send PS nullfunc\n",
+			       __func__);
+			ath9k_mark_paused(aphy);
+		}
+		break;
+	case NL80211_IFTYPE_AP:
+		/* Beacon transmission is paused by aphy->state change */
+		ath9k_mark_paused(aphy);
+		break;
+	default:
+		break;
+	}
+}
+
+/* caller must hold wiphy_lock */
+static int __ath9k_wiphy_pause(struct ath_wiphy *aphy)
+{
+	ieee80211_stop_queues(aphy->hw);
+	aphy->state = ATH_WIPHY_PAUSING;
+	/*
+	 * TODO: handle PAUSING->PAUSED for the case where there are multiple
+	 * active vifs (now we do it on the first vif getting ready; should be
+	 * on the last)
+	 */
+	ieee80211_iterate_active_interfaces_atomic(aphy->hw, ath9k_pause_iter,
+						   aphy);
+	return 0;
+}
+
+int ath9k_wiphy_pause(struct ath_wiphy *aphy)
+{
+	int ret;
+	spin_lock_bh(&aphy->sc->wiphy_lock);
+	ret = __ath9k_wiphy_pause(aphy);
+	spin_unlock_bh(&aphy->sc->wiphy_lock);
+	return ret;
+}
+
+static void ath9k_unpause_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
+{
+	struct ath_wiphy *aphy = data;
+	struct ath_vif *avp = (void *) vif->drv_priv;
+
+	switch (vif->type) {
+	case NL80211_IFTYPE_STATION:
+		if (!vif->bss_conf.assoc)
+			break;
+		ath9k_send_nullfunc(aphy, vif, avp->bssid, 0);
+		break;
+	case NL80211_IFTYPE_AP:
+		/* Beacon transmission is re-enabled by aphy->state change */
+		break;
+	default:
+		break;
+	}
+}
+
+/* caller must hold wiphy_lock */
+static int __ath9k_wiphy_unpause(struct ath_wiphy *aphy)
+{
+	ieee80211_iterate_active_interfaces_atomic(aphy->hw,
+						   ath9k_unpause_iter, aphy);
+	aphy->state = ATH_WIPHY_ACTIVE;
+	ieee80211_wake_queues(aphy->hw);
+	return 0;
+}
+
+int ath9k_wiphy_unpause(struct ath_wiphy *aphy)
+{
+	int ret;
+	spin_lock_bh(&aphy->sc->wiphy_lock);
+	ret = __ath9k_wiphy_unpause(aphy);
+	spin_unlock_bh(&aphy->sc->wiphy_lock);
+	return ret;
+}
+
+static void __ath9k_wiphy_mark_all_paused(struct ath_softc *sc)
+{
+	int i;
+	if (sc->pri_wiphy->state != ATH_WIPHY_INACTIVE)
+		sc->pri_wiphy->state = ATH_WIPHY_PAUSED;
+	for (i = 0; i < sc->num_sec_wiphy; i++) {
+		if (sc->sec_wiphy[i] &&
+		    sc->sec_wiphy[i]->state != ATH_WIPHY_INACTIVE)
+			sc->sec_wiphy[i]->state = ATH_WIPHY_PAUSED;
+	}
+}
+
+/* caller must hold wiphy_lock */
+static void __ath9k_wiphy_pause_all(struct ath_softc *sc)
+{
+	int i;
+	if (sc->pri_wiphy->state == ATH_WIPHY_ACTIVE)
+		__ath9k_wiphy_pause(sc->pri_wiphy);
+	for (i = 0; i < sc->num_sec_wiphy; i++) {
+		if (sc->sec_wiphy[i] &&
+		    sc->sec_wiphy[i]->state == ATH_WIPHY_ACTIVE)
+			__ath9k_wiphy_pause(sc->sec_wiphy[i]);
+	}
+}
+
+int ath9k_wiphy_select(struct ath_wiphy *aphy)
+{
+	struct ath_softc *sc = aphy->sc;
+	bool now;
+
+	spin_lock_bh(&sc->wiphy_lock);
+	if (__ath9k_wiphy_scanning(sc)) {
+		/*
+		 * For now, we are using mac80211 sw scan and it expects to
+		 * have full control over channel changes, so avoid wiphy
+		 * scheduling during a scan. This could be optimized if the
+		 * scanning control were moved into the driver.
+		 */
+		spin_unlock_bh(&sc->wiphy_lock);
+		return -EBUSY;
+	}
+	if (__ath9k_wiphy_pausing(sc)) {
+		if (sc->wiphy_select_failures == 0)
+			sc->wiphy_select_first_fail = jiffies;
+		sc->wiphy_select_failures++;
+		if (time_after(jiffies, sc->wiphy_select_first_fail + HZ / 2))
+		{
+			printk(KERN_DEBUG "ath9k: Previous wiphy select timed "
+			       "out; disable/enable hw to recover\n");
+			__ath9k_wiphy_mark_all_paused(sc);
+			/*
+			 * TODO: this workaround to fix hardware is unlikely to
+			 * be specific to virtual wiphy changes. It can happen
+			 * on normal channel change, too, and as such, this
+			 * should really be made more generic. For example,
+			 * tricker radio disable/enable on GTT interrupt burst
+			 * (say, 10 GTT interrupts received without any TX
+			 * frame being completed)
+			 */
+			spin_unlock_bh(&sc->wiphy_lock);
+			ath_radio_disable(sc);
+			ath_radio_enable(sc);
+			queue_work(aphy->sc->hw->workqueue,
+				   &aphy->sc->chan_work);
+			return -EBUSY; /* previous select still in progress */
+		}
+		spin_unlock_bh(&sc->wiphy_lock);
+		return -EBUSY; /* previous select still in progress */
+	}
+	sc->wiphy_select_failures = 0;
+
+	/* Store the new channel */
+	sc->chan_idx = aphy->chan_idx;
+	sc->chan_is_ht = aphy->chan_is_ht;
+	sc->next_wiphy = aphy;
+
+	__ath9k_wiphy_pause_all(sc);
+	now = !__ath9k_wiphy_pausing(aphy->sc);
+	spin_unlock_bh(&sc->wiphy_lock);
+
+	if (now) {
+		/* Ready to request channel change immediately */
+		queue_work(aphy->sc->hw->workqueue, &aphy->sc->chan_work);
+	}
+
+	/*
+	 * wiphys will be unpaused in ath9k_tx_status() once channel has been
+	 * changed if any wiphy needs time to become paused.
+	 */
+
+	return 0;
+}
+
+bool ath9k_wiphy_started(struct ath_softc *sc)
+{
+	int i;
+	spin_lock_bh(&sc->wiphy_lock);
+	if (sc->pri_wiphy->state != ATH_WIPHY_INACTIVE) {
+		spin_unlock_bh(&sc->wiphy_lock);
+		return true;
+	}
+	for (i = 0; i < sc->num_sec_wiphy; i++) {
+		if (sc->sec_wiphy[i] &&
+		    sc->sec_wiphy[i]->state != ATH_WIPHY_INACTIVE) {
+			spin_unlock_bh(&sc->wiphy_lock);
+			return true;
+		}
+	}
+	spin_unlock_bh(&sc->wiphy_lock);
+	return false;
+}
+
+static void ath9k_wiphy_pause_chan(struct ath_wiphy *aphy,
+				   struct ath_wiphy *selected)
+{
+	if (selected->state == ATH_WIPHY_SCAN) {
+		if (aphy == selected)
+			return;
+		/*
+		 * Pause all other wiphys for the duration of the scan even if
+		 * they are on the current channel now.
+		 */
+	} else if (aphy->chan_idx == selected->chan_idx)
+		return;
+	aphy->state = ATH_WIPHY_PAUSED;
+	ieee80211_stop_queues(aphy->hw);
+}
+
+void ath9k_wiphy_pause_all_forced(struct ath_softc *sc,
+				  struct ath_wiphy *selected)
+{
+	int i;
+	spin_lock_bh(&sc->wiphy_lock);
+	if (sc->pri_wiphy->state == ATH_WIPHY_ACTIVE)
+		ath9k_wiphy_pause_chan(sc->pri_wiphy, selected);
+	for (i = 0; i < sc->num_sec_wiphy; i++) {
+		if (sc->sec_wiphy[i] &&
+		    sc->sec_wiphy[i]->state == ATH_WIPHY_ACTIVE)
+			ath9k_wiphy_pause_chan(sc->sec_wiphy[i], selected);
+	}
+	spin_unlock_bh(&sc->wiphy_lock);
+}
+
+void ath9k_wiphy_work(struct work_struct *work)
+{
+	struct ath_softc *sc = container_of(work, struct ath_softc,
+					    wiphy_work.work);
+	struct ath_wiphy *aphy = NULL;
+	bool first = true;
+
+	spin_lock_bh(&sc->wiphy_lock);
+
+	if (sc->wiphy_scheduler_int == 0) {
+		/* wiphy scheduler is disabled */
+		spin_unlock_bh(&sc->wiphy_lock);
+		return;
+	}
+
+try_again:
+	sc->wiphy_scheduler_index++;
+	while (sc->wiphy_scheduler_index <= sc->num_sec_wiphy) {
+		aphy = sc->sec_wiphy[sc->wiphy_scheduler_index - 1];
+		if (aphy && aphy->state != ATH_WIPHY_INACTIVE)
+			break;
+
+		sc->wiphy_scheduler_index++;
+		aphy = NULL;
+	}
+	if (aphy == NULL) {
+		sc->wiphy_scheduler_index = 0;
+		if (sc->pri_wiphy->state == ATH_WIPHY_INACTIVE) {
+			if (first) {
+				first = false;
+				goto try_again;
+			}
+			/* No wiphy is ready to be scheduled */
+		} else
+			aphy = sc->pri_wiphy;
+	}
+
+	spin_unlock_bh(&sc->wiphy_lock);
+
+	if (aphy &&
+	    aphy->state != ATH_WIPHY_ACTIVE && aphy->state != ATH_WIPHY_SCAN &&
+	    ath9k_wiphy_select(aphy)) {
+		printk(KERN_DEBUG "ath9k: Failed to schedule virtual wiphy "
+		       "change\n");
+	}
+
+	queue_delayed_work(sc->hw->workqueue, &sc->wiphy_work,
+			   sc->wiphy_scheduler_int);
+}
+
+void ath9k_wiphy_set_scheduler(struct ath_softc *sc, unsigned int msec_int)
+{
+	cancel_delayed_work_sync(&sc->wiphy_work);
+	sc->wiphy_scheduler_int = msecs_to_jiffies(msec_int);
+	if (sc->wiphy_scheduler_int)
+		queue_delayed_work(sc->hw->workqueue, &sc->wiphy_work,
+				   sc->wiphy_scheduler_int);
+}