drivers/net/wireless/ath/ath9k/wow.c - vendor/opensource/backports - Git at Google

 /*
  * Copyright (c) 2013 Qualcomm Atheros, 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"

 static const struct wiphy_wowlan_support ath9k_wowlan_support_legacy = {
 	.flags = WIPHY_WOWLAN_MAGIC_PKT | WIPHY_WOWLAN_DISCONNECT,
 	.n_patterns = MAX_NUM_USER_PATTERN,
 	.pattern_min_len = 1,
 	.pattern_max_len = MAX_PATTERN_SIZE,
 };

 static const struct wiphy_wowlan_support ath9k_wowlan_support = {
 	.flags = WIPHY_WOWLAN_MAGIC_PKT | WIPHY_WOWLAN_DISCONNECT,
 	.n_patterns = MAX_NUM_PATTERN - 2,
 	.pattern_min_len = 1,
 	.pattern_max_len = MAX_PATTERN_SIZE,
 };

 static u8 ath9k_wow_map_triggers(struct ath_softc *sc,
 				 struct cfg80211_wowlan *wowlan)
 {
 	u8 wow_triggers = 0;

 	if (wowlan->disconnect)
 		wow_triggers |= AH_WOW_LINK_CHANGE |
 				AH_WOW_BEACON_MISS;
 	if (wowlan->magic_pkt)
 		wow_triggers |= AH_WOW_MAGIC_PATTERN_EN;

 	if (wowlan->n_patterns)
 		wow_triggers |= AH_WOW_USER_PATTERN_EN;

 	return wow_triggers;
 }

 static int ath9k_wow_add_disassoc_deauth_pattern(struct ath_softc *sc)
 {
 	struct ath_hw *ah = sc->sc_ah;
 	struct ath_common *common = ath9k_hw_common(ah);
 	int pattern_count = 0;
 	int ret, i, byte_cnt = 0;
 	u8 dis_deauth_pattern[MAX_PATTERN_SIZE];
 	u8 dis_deauth_mask[MAX_PATTERN_SIZE];

 	memset(dis_deauth_pattern, 0, MAX_PATTERN_SIZE);
 	memset(dis_deauth_mask, 0, MAX_PATTERN_SIZE);

 	/*
 	 * Create Dissassociate / Deauthenticate packet filter
 	 *
 	 *     2 bytes        2 byte    6 bytes   6 bytes  6 bytes
 	 *  +--------------+----------+---------+--------+--------+----
 	 *  + Frame Control+ Duration +   DA    +  SA    +  BSSID +
 	 *  +--------------+----------+---------+--------+--------+----
 	 *
 	 * The above is the management frame format for disassociate/
 	 * deauthenticate pattern, from this we need to match the first byte
 	 * of 'Frame Control' and DA, SA, and BSSID fields
 	 * (skipping 2nd byte of FC and Duration feild.
 	 *
 	 * Disassociate pattern
 	 * --------------------
 	 * Frame control = 00 00 1010
 	 * DA, SA, BSSID = x:x:x:x:x:x
 	 * Pattern will be A0000000 | x:x:x:x:x:x | x:x:x:x:x:x
 	 *			    | x:x:x:x:x:x  -- 22 bytes
 	 *
 	 * Deauthenticate pattern
 	 * ----------------------
 	 * Frame control = 00 00 1100
 	 * DA, SA, BSSID = x:x:x:x:x:x
 	 * Pattern will be C0000000 | x:x:x:x:x:x | x:x:x:x:x:x
 	 *			    | x:x:x:x:x:x  -- 22 bytes
 	 */

 	/* Fill out the mask with all FF's */
 	for (i = 0; i < MAX_PATTERN_MASK_SIZE; i++)
 		dis_deauth_mask[i] = 0xff;

 	/* copy the first byte of frame control field */
 	dis_deauth_pattern[byte_cnt] = 0xa0;
 	byte_cnt++;

 	/* skip 2nd byte of frame control and Duration field */
 	byte_cnt += 3;

 	/*
 	 * need not match the destination mac address, it can be a broadcast
 	 * mac address or an unicast to this station
 	 */
 	byte_cnt += 6;

 	/* copy the source mac address */
 	memcpy((dis_deauth_pattern + byte_cnt), common->curbssid, ETH_ALEN);

 	byte_cnt += 6;

 	/* copy the bssid, its same as the source mac address */
 	memcpy((dis_deauth_pattern + byte_cnt), common->curbssid, ETH_ALEN);

 	/* Create Disassociate pattern mask */
 	dis_deauth_mask[0] = 0xfe;
 	dis_deauth_mask[1] = 0x03;
 	dis_deauth_mask[2] = 0xc0;

 	ret = ath9k_hw_wow_apply_pattern(ah, dis_deauth_pattern, dis_deauth_mask,
 					 pattern_count, byte_cnt);
 	if (ret)
 		goto exit;

 	pattern_count++;
 	/*
 	 * for de-authenticate pattern, only the first byte of the frame
 	 * control field gets changed from 0xA0 to 0xC0
 	 */
 	dis_deauth_pattern[0] = 0xC0;

 	ret = ath9k_hw_wow_apply_pattern(ah, dis_deauth_pattern, dis_deauth_mask,
 					 pattern_count, byte_cnt);
 exit:
 	return ret;
 }

 static int ath9k_wow_add_pattern(struct ath_softc *sc,
 				 struct cfg80211_wowlan *wowlan)
 {
 	struct ath_hw *ah = sc->sc_ah;
 	struct cfg80211_pkt_pattern *patterns = wowlan->patterns;
 	u8 wow_pattern[MAX_PATTERN_SIZE];
 	u8 wow_mask[MAX_PATTERN_SIZE];
 	int mask_len, ret = 0;
 	s8 i = 0;

 	for (i = 0; i < wowlan->n_patterns; i++) {
 		mask_len = DIV_ROUND_UP(patterns[i].pattern_len, 8);
 		memset(wow_pattern, 0, MAX_PATTERN_SIZE);
 		memset(wow_mask, 0, MAX_PATTERN_SIZE);
 		memcpy(wow_pattern, patterns[i].pattern, patterns[i].pattern_len);
 		memcpy(wow_mask, patterns[i].mask, mask_len);

 		ret = ath9k_hw_wow_apply_pattern(ah,
 						 wow_pattern,
 						 wow_mask,
 						 i + 2,
 						 patterns[i].pattern_len);
 		if (ret)
 			break;
 	}

 	return ret;
 }

 int ath9k_suspend(struct ieee80211_hw *hw,
 		  struct cfg80211_wowlan *wowlan)
 {
 	struct ath_softc *sc = hw->priv;
 	struct ath_hw *ah = sc->sc_ah;
 	struct ath_common *common = ath9k_hw_common(ah);
 	u8 triggers;
 	int ret = 0;

 	ath9k_deinit_channel_context(sc);

 	mutex_lock(&sc->mutex);

 	if (test_bit(ATH_OP_INVALID, &common->op_flags)) {
 		ath_err(common, "Device not present\n");
 		ret = -ENODEV;
 		goto fail_wow;
 	}

 	if (WARN_ON(!wowlan)) {
 		ath_err(common, "None of the WoW triggers enabled\n");
 		ret = -EINVAL;
 		goto fail_wow;
 	}

 	if (sc->cur_chan->nvifs > 1) {
 		ath_dbg(common, WOW, "WoW for multivif is not yet supported\n");
 		ret = 1;
 		goto fail_wow;
 	}

 	if (ath9k_is_chanctx_enabled()) {
 		if (test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags)) {
 			ath_dbg(common, WOW,
 				"Multi-channel WOW is not supported\n");
 			ret = 1;
 			goto fail_wow;
 		}
 	}

 	if (!test_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags)) {
 		ath_dbg(common, WOW, "None of the STA vifs are associated\n");
 		ret = 1;
 		goto fail_wow;
 	}

 	triggers = ath9k_wow_map_triggers(sc, wowlan);
 	if (!triggers) {
 		ath_dbg(common, WOW, "No valid WoW triggers\n");
 		ret = 1;
 		goto fail_wow;
 	}

 	ath_cancel_work(sc);
 	ath_stop_ani(sc);

 	ath9k_ps_wakeup(sc);

 	ath9k_stop_btcoex(sc);

 	/*
 	 * Enable wake up on recieving disassoc/deauth
 	 * frame by default.
 	 */
 	ret = ath9k_wow_add_disassoc_deauth_pattern(sc);
 	if (ret) {
 		ath_err(common,
 			"Unable to add disassoc/deauth pattern: %d\n", ret);
 		goto fail_wow;
 	}

 	if (triggers & AH_WOW_USER_PATTERN_EN) {
 		ret = ath9k_wow_add_pattern(sc, wowlan);
 		if (ret) {
 			ath_err(common,
 				"Unable to add user pattern: %d\n", ret);
 			goto fail_wow;
 		}
 	}

 	spin_lock_bh(&sc->sc_pcu_lock);
 	/*
 	 * To avoid false wake, we enable beacon miss interrupt only
 	 * when we go to sleep. We save the current interrupt mask
 	 * so we can restore it after the system wakes up
 	 */
 	sc->wow_intr_before_sleep = ah->imask;
 	ah->imask &= ~ATH9K_INT_GLOBAL;
 	ath9k_hw_disable_interrupts(ah);
 	ah->imask = ATH9K_INT_BMISS | ATH9K_INT_GLOBAL;
 	ath9k_hw_set_interrupts(ah);
 	ath9k_hw_enable_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);

 	ath9k_hw_wow_enable(ah, triggers);

 	ath9k_ps_restore(sc);
 	ath_dbg(common, WOW, "Suspend with WoW triggers: 0x%x\n", triggers);

 	set_bit(ATH_OP_WOW_ENABLED, &common->op_flags);
 fail_wow:
 	mutex_unlock(&sc->mutex);
 	return ret;
 }

 int ath9k_resume(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);
 	u8 status;

 	mutex_lock(&sc->mutex);

 	ath9k_ps_wakeup(sc);

 	spin_lock_bh(&sc->sc_pcu_lock);

 	ath9k_hw_disable_interrupts(ah);
 	ah->imask = sc->wow_intr_before_sleep;
 	ath9k_hw_set_interrupts(ah);
 	ath9k_hw_enable_interrupts(ah);

 	spin_unlock_bh(&sc->sc_pcu_lock);

 	status = ath9k_hw_wow_wakeup(ah);
 	ath_dbg(common, WOW, "Resume with WoW status: 0x%x\n", status);

 	ath_restart_work(sc);
 	ath9k_start_btcoex(sc);

 	clear_bit(ATH_OP_WOW_ENABLED, &common->op_flags);

 	ath9k_ps_restore(sc);
 	mutex_unlock(&sc->mutex);

 	return 0;
 }

 void ath9k_set_wakeup(struct ieee80211_hw *hw, bool enabled)
 {
 	struct ath_softc *sc = hw->priv;
 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);

 	mutex_lock(&sc->mutex);
 	device_set_wakeup_enable(sc->dev, enabled);
 	mutex_unlock(&sc->mutex);

 	ath_dbg(common, WOW, "WoW wakeup source is %s\n",
 		(enabled) ? "enabled" : "disabled");
 }

 void ath9k_init_wow(struct ieee80211_hw *hw)
 {
 	struct ath_softc *sc = hw->priv;
 	struct ath_hw *ah = sc->sc_ah;

 	if ((sc->driver_data & ATH9K_PCI_WOW) || sc->force_wow) {
 		if (AR_SREV_9462_20_OR_LATER(ah) || AR_SREV_9565_11_OR_LATER(ah))
 			hw->wiphy->wowlan = &ath9k_wowlan_support;
 		else
 			hw->wiphy->wowlan = &ath9k_wowlan_support_legacy;

 		device_init_wakeup(sc->dev, 1);
 	}
 }

 void ath9k_deinit_wow(struct ieee80211_hw *hw)
 {
 	struct ath_softc *sc = hw->priv;

 	if ((sc->driver_data & ATH9K_PCI_WOW) || sc->force_wow)
 		device_init_wakeup(sc->dev, 0);
 }
	/*
	* Copyright (c) 2013 Qualcomm Atheros, 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"

	static const struct wiphy_wowlan_support ath9k_wowlan_support_legacy = {
	.flags = WIPHY_WOWLAN_MAGIC_PKT \| WIPHY_WOWLAN_DISCONNECT,
	.n_patterns = MAX_NUM_USER_PATTERN,
	.pattern_min_len = 1,
	.pattern_max_len = MAX_PATTERN_SIZE,
	};

	static const struct wiphy_wowlan_support ath9k_wowlan_support = {
	.flags = WIPHY_WOWLAN_MAGIC_PKT \| WIPHY_WOWLAN_DISCONNECT,
	.n_patterns = MAX_NUM_PATTERN - 2,
	.pattern_min_len = 1,
	.pattern_max_len = MAX_PATTERN_SIZE,
	};

	static u8 ath9k_wow_map_triggers(struct ath_softc *sc,
	struct cfg80211_wowlan *wowlan)
	{
	u8 wow_triggers = 0;

	if (wowlan->disconnect)
	wow_triggers \|= AH_WOW_LINK_CHANGE \|
	AH_WOW_BEACON_MISS;
	if (wowlan->magic_pkt)
	wow_triggers \|= AH_WOW_MAGIC_PATTERN_EN;

	if (wowlan->n_patterns)
	wow_triggers \|= AH_WOW_USER_PATTERN_EN;

	return wow_triggers;
	}

	static int ath9k_wow_add_disassoc_deauth_pattern(struct ath_softc *sc)
	{
	struct ath_hw *ah = sc->sc_ah;
	struct ath_common *common = ath9k_hw_common(ah);
	int pattern_count = 0;
	int ret, i, byte_cnt = 0;
	u8 dis_deauth_pattern[MAX_PATTERN_SIZE];
	u8 dis_deauth_mask[MAX_PATTERN_SIZE];

	memset(dis_deauth_pattern, 0, MAX_PATTERN_SIZE);
	memset(dis_deauth_mask, 0, MAX_PATTERN_SIZE);

	/*
	* Create Dissassociate / Deauthenticate packet filter
	*
	* 2 bytes 2 byte 6 bytes 6 bytes 6 bytes
	* +--------------+----------+---------+--------+--------+----
	* + Frame Control+ Duration + DA + SA + BSSID +
	* +--------------+----------+---------+--------+--------+----
	*
	* The above is the management frame format for disassociate/
	* deauthenticate pattern, from this we need to match the first byte
	* of 'Frame Control' and DA, SA, and BSSID fields
	* (skipping 2nd byte of FC and Duration feild.
	*
	* Disassociate pattern
	* --------------------
	* Frame control = 00 00 1010
	* DA, SA, BSSID = x:x:x:x:x:x
	* Pattern will be A0000000 \| x:x:x:x:x:x \| x:x:x:x:x:x
	* \| x:x:x:x:x:x -- 22 bytes
	*
	* Deauthenticate pattern
	* ----------------------
	* Frame control = 00 00 1100
	* DA, SA, BSSID = x:x:x:x:x:x
	* Pattern will be C0000000 \| x:x:x:x:x:x \| x:x:x:x:x:x
	* \| x:x:x:x:x:x -- 22 bytes
	*/

	/* Fill out the mask with all FF's */
	for (i = 0; i < MAX_PATTERN_MASK_SIZE; i++)
	dis_deauth_mask[i] = 0xff;

	/* copy the first byte of frame control field */
	dis_deauth_pattern[byte_cnt] = 0xa0;
	byte_cnt++;

	/* skip 2nd byte of frame control and Duration field */
	byte_cnt += 3;

	/*
	* need not match the destination mac address, it can be a broadcast
	* mac address or an unicast to this station
	*/
	byte_cnt += 6;

	/* copy the source mac address */
	memcpy((dis_deauth_pattern + byte_cnt), common->curbssid, ETH_ALEN);

	byte_cnt += 6;

	/* copy the bssid, its same as the source mac address */
	memcpy((dis_deauth_pattern + byte_cnt), common->curbssid, ETH_ALEN);

	/* Create Disassociate pattern mask */
	dis_deauth_mask[0] = 0xfe;
	dis_deauth_mask[1] = 0x03;
	dis_deauth_mask[2] = 0xc0;

	ret = ath9k_hw_wow_apply_pattern(ah, dis_deauth_pattern, dis_deauth_mask,
	pattern_count, byte_cnt);
	if (ret)
	goto exit;

	pattern_count++;
	/*
	* for de-authenticate pattern, only the first byte of the frame
	* control field gets changed from 0xA0 to 0xC0
	*/
	dis_deauth_pattern[0] = 0xC0;

	ret = ath9k_hw_wow_apply_pattern(ah, dis_deauth_pattern, dis_deauth_mask,
	pattern_count, byte_cnt);
	exit:
	return ret;
	}

	static int ath9k_wow_add_pattern(struct ath_softc *sc,
	struct cfg80211_wowlan *wowlan)
	{
	struct ath_hw *ah = sc->sc_ah;
	struct cfg80211_pkt_pattern *patterns = wowlan->patterns;
	u8 wow_pattern[MAX_PATTERN_SIZE];
	u8 wow_mask[MAX_PATTERN_SIZE];
	int mask_len, ret = 0;
	s8 i = 0;

	for (i = 0; i < wowlan->n_patterns; i++) {
	mask_len = DIV_ROUND_UP(patterns[i].pattern_len, 8);
	memset(wow_pattern, 0, MAX_PATTERN_SIZE);
	memset(wow_mask, 0, MAX_PATTERN_SIZE);
	memcpy(wow_pattern, patterns[i].pattern, patterns[i].pattern_len);
	memcpy(wow_mask, patterns[i].mask, mask_len);

	ret = ath9k_hw_wow_apply_pattern(ah,
	wow_pattern,
	wow_mask,
	i + 2,
	patterns[i].pattern_len);
	if (ret)
	break;
	}

	return ret;
	}

	int ath9k_suspend(struct ieee80211_hw *hw,
	struct cfg80211_wowlan *wowlan)
	{
	struct ath_softc *sc = hw->priv;
	struct ath_hw *ah = sc->sc_ah;
	struct ath_common *common = ath9k_hw_common(ah);
	u8 triggers;
	int ret = 0;

	ath9k_deinit_channel_context(sc);

	mutex_lock(&sc->mutex);

	if (test_bit(ATH_OP_INVALID, &common->op_flags)) {
	ath_err(common, "Device not present\n");
	ret = -ENODEV;
	goto fail_wow;
	}

	if (WARN_ON(!wowlan)) {
	ath_err(common, "None of the WoW triggers enabled\n");
	ret = -EINVAL;
	goto fail_wow;
	}

	if (sc->cur_chan->nvifs > 1) {
	ath_dbg(common, WOW, "WoW for multivif is not yet supported\n");
	ret = 1;
	goto fail_wow;
	}

	if (ath9k_is_chanctx_enabled()) {
	if (test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags)) {
	ath_dbg(common, WOW,
	"Multi-channel WOW is not supported\n");
	ret = 1;
	goto fail_wow;
	}
	}

	if (!test_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags)) {
	ath_dbg(common, WOW, "None of the STA vifs are associated\n");
	ret = 1;
	goto fail_wow;
	}

	triggers = ath9k_wow_map_triggers(sc, wowlan);
	if (!triggers) {
	ath_dbg(common, WOW, "No valid WoW triggers\n");
	ret = 1;
	goto fail_wow;
	}

	ath_cancel_work(sc);
	ath_stop_ani(sc);

	ath9k_ps_wakeup(sc);

	ath9k_stop_btcoex(sc);

	/*
	* Enable wake up on recieving disassoc/deauth
	* frame by default.
	*/
	ret = ath9k_wow_add_disassoc_deauth_pattern(sc);
	if (ret) {
	ath_err(common,
	"Unable to add disassoc/deauth pattern: %d\n", ret);
	goto fail_wow;
	}

	if (triggers & AH_WOW_USER_PATTERN_EN) {
	ret = ath9k_wow_add_pattern(sc, wowlan);
	if (ret) {
	ath_err(common,
	"Unable to add user pattern: %d\n", ret);
	goto fail_wow;
	}
	}

	spin_lock_bh(&sc->sc_pcu_lock);
	/*
	* To avoid false wake, we enable beacon miss interrupt only
	* when we go to sleep. We save the current interrupt mask
	* so we can restore it after the system wakes up
	*/
	sc->wow_intr_before_sleep = ah->imask;
	ah->imask &= ~ATH9K_INT_GLOBAL;
	ath9k_hw_disable_interrupts(ah);
	ah->imask = ATH9K_INT_BMISS \| ATH9K_INT_GLOBAL;
	ath9k_hw_set_interrupts(ah);
	ath9k_hw_enable_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);

	ath9k_hw_wow_enable(ah, triggers);

	ath9k_ps_restore(sc);
	ath_dbg(common, WOW, "Suspend with WoW triggers: 0x%x\n", triggers);

	set_bit(ATH_OP_WOW_ENABLED, &common->op_flags);
	fail_wow:
	mutex_unlock(&sc->mutex);
	return ret;
	}

	int ath9k_resume(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);
	u8 status;

	mutex_lock(&sc->mutex);

	ath9k_ps_wakeup(sc);

	spin_lock_bh(&sc->sc_pcu_lock);

	ath9k_hw_disable_interrupts(ah);
	ah->imask = sc->wow_intr_before_sleep;
	ath9k_hw_set_interrupts(ah);
	ath9k_hw_enable_interrupts(ah);

	spin_unlock_bh(&sc->sc_pcu_lock);

	status = ath9k_hw_wow_wakeup(ah);
	ath_dbg(common, WOW, "Resume with WoW status: 0x%x\n", status);

	ath_restart_work(sc);
	ath9k_start_btcoex(sc);

	clear_bit(ATH_OP_WOW_ENABLED, &common->op_flags);

	ath9k_ps_restore(sc);
	mutex_unlock(&sc->mutex);

	return 0;
	}

	void ath9k_set_wakeup(struct ieee80211_hw *hw, bool enabled)
	{
	struct ath_softc *sc = hw->priv;
	struct ath_common *common = ath9k_hw_common(sc->sc_ah);

	mutex_lock(&sc->mutex);
	device_set_wakeup_enable(sc->dev, enabled);
	mutex_unlock(&sc->mutex);

	ath_dbg(common, WOW, "WoW wakeup source is %s\n",
	(enabled) ? "enabled" : "disabled");
	}

	void ath9k_init_wow(struct ieee80211_hw *hw)
	{
	struct ath_softc *sc = hw->priv;
	struct ath_hw *ah = sc->sc_ah;

	if ((sc->driver_data & ATH9K_PCI_WOW) \|\| sc->force_wow) {
	if (AR_SREV_9462_20_OR_LATER(ah) \|\| AR_SREV_9565_11_OR_LATER(ah))
	hw->wiphy->wowlan = &ath9k_wowlan_support;
	else
	hw->wiphy->wowlan = &ath9k_wowlan_support_legacy;

	device_init_wakeup(sc->dev, 1);
	}
	}

	void ath9k_deinit_wow(struct ieee80211_hw *hw)
	{
	struct ath_softc *sc = hw->priv;

	if ((sc->driver_data & ATH9K_PCI_WOW) \|\| sc->force_wow)
	device_init_wakeup(sc->dev, 0);
	}