drivers/net/wireless/ath/ath9k/common.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (c) 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.
  */

 /*
  * Module for common driver code between ath9k and ath9k_htc
  */

 #include <linux/kernel.h>
 #include <linux/module.h>

 #include "common.h"

 MODULE_AUTHOR("Atheros Communications");
 MODULE_DESCRIPTION("Shared library for Atheros wireless 802.11n LAN cards.");
 MODULE_LICENSE("Dual BSD/GPL");

 int ath9k_cmn_padpos(__le16 frame_control)
 {
 	int padpos = 24;
 	if (ieee80211_has_a4(frame_control)) {
 		padpos += ETH_ALEN;
 	}
 	if (ieee80211_is_data_qos(frame_control)) {
 		padpos += IEEE80211_QOS_CTL_LEN;
 	}

 	return padpos;
 }
 EXPORT_SYMBOL(ath9k_cmn_padpos);

 int ath9k_cmn_get_hw_crypto_keytype(struct sk_buff *skb)
 {
 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);

 	if (tx_info->control.hw_key) {
 		if (tx_info->control.hw_key->alg == ALG_WEP)
 			return ATH9K_KEY_TYPE_WEP;
 		else if (tx_info->control.hw_key->alg == ALG_TKIP)
 			return ATH9K_KEY_TYPE_TKIP;
 		else if (tx_info->control.hw_key->alg == ALG_CCMP)
 			return ATH9K_KEY_TYPE_AES;
 	}

 	return ATH9K_KEY_TYPE_CLEAR;
 }
 EXPORT_SYMBOL(ath9k_cmn_get_hw_crypto_keytype);

 static u32 ath9k_get_extchanmode(struct ieee80211_channel *chan,
 				 enum nl80211_channel_type channel_type)
 {
 	u32 chanmode = 0;

 	switch (chan->band) {
 	case IEEE80211_BAND_2GHZ:
 		switch (channel_type) {
 		case NL80211_CHAN_NO_HT:
 		case NL80211_CHAN_HT20:
 			chanmode = CHANNEL_G_HT20;
 			break;
 		case NL80211_CHAN_HT40PLUS:
 			chanmode = CHANNEL_G_HT40PLUS;
 			break;
 		case NL80211_CHAN_HT40MINUS:
 			chanmode = CHANNEL_G_HT40MINUS;
 			break;
 		}
 		break;
 	case IEEE80211_BAND_5GHZ:
 		switch (channel_type) {
 		case NL80211_CHAN_NO_HT:
 		case NL80211_CHAN_HT20:
 			chanmode = CHANNEL_A_HT20;
 			break;
 		case NL80211_CHAN_HT40PLUS:
 			chanmode = CHANNEL_A_HT40PLUS;
 			break;
 		case NL80211_CHAN_HT40MINUS:
 			chanmode = CHANNEL_A_HT40MINUS;
 			break;
 		}
 		break;
 	default:
 		break;
 	}

 	return chanmode;
 }

 /*
  * Update internal channel flags.
  */
 void ath9k_cmn_update_ichannel(struct ieee80211_hw *hw,
 			       struct ath9k_channel *ichan)
 {
 	struct ieee80211_channel *chan = hw->conf.channel;
 	struct ieee80211_conf *conf = &hw->conf;

 	ichan->channel = chan->center_freq;
 	ichan->chan = chan;

 	if (chan->band == IEEE80211_BAND_2GHZ) {
 		ichan->chanmode = CHANNEL_G;
 		ichan->channelFlags = CHANNEL_2GHZ | CHANNEL_OFDM | CHANNEL_G;
 	} else {
 		ichan->chanmode = CHANNEL_A;
 		ichan->channelFlags = CHANNEL_5GHZ | CHANNEL_OFDM;
 	}

 	if (conf_is_ht(conf))
 		ichan->chanmode = ath9k_get_extchanmode(chan,
 							conf->channel_type);
 }
 EXPORT_SYMBOL(ath9k_cmn_update_ichannel);

 /*
  * Get the internal channel reference.
  */
 struct ath9k_channel *ath9k_cmn_get_curchannel(struct ieee80211_hw *hw,
 					       struct ath_hw *ah)
 {
 	struct ieee80211_channel *curchan = hw->conf.channel;
 	struct ath9k_channel *channel;
 	u8 chan_idx;

 	chan_idx = curchan->hw_value;
 	channel = &ah->channels[chan_idx];
 	ath9k_cmn_update_ichannel(hw, channel);

 	return channel;
 }
 EXPORT_SYMBOL(ath9k_cmn_get_curchannel);

 static int ath_setkey_tkip(struct ath_common *common, u16 keyix, const u8 *key,
 			   struct ath9k_keyval *hk, const u8 *addr,
 			   bool authenticator)
 {
 	struct ath_hw *ah = common->ah;
 	const u8 *key_rxmic;
 	const u8 *key_txmic;

 	key_txmic = key + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
 	key_rxmic = key + NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;

 	if (addr == NULL) {
 		/*
 		 * Group key installation - only two key cache entries are used
 		 * regardless of splitmic capability since group key is only
 		 * used either for TX or RX.
 		 */
 		if (authenticator) {
 			memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
 			memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_mic));
 		} else {
 			memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
 			memcpy(hk->kv_txmic, key_rxmic, sizeof(hk->kv_mic));
 		}
 		return ath9k_hw_set_keycache_entry(ah, keyix, hk, addr);
 	}
 	if (!common->splitmic) {
 		/* TX and RX keys share the same key cache entry. */
 		memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
 		memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_txmic));
 		return ath9k_hw_set_keycache_entry(ah, keyix, hk, addr);
 	}

 	/* Separate key cache entries for TX and RX */

 	/* TX key goes at first index, RX key at +32. */
 	memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
 	if (!ath9k_hw_set_keycache_entry(ah, keyix, hk, NULL)) {
 		/* TX MIC entry failed. No need to proceed further */
 		ath_print(common, ATH_DBG_FATAL,
 			  "Setting TX MIC Key Failed\n");
 		return 0;
 	}

 	memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
 	/* XXX delete tx key on failure? */
 	return ath9k_hw_set_keycache_entry(ah, keyix + 32, hk, addr);
 }

 static int ath_reserve_key_cache_slot_tkip(struct ath_common *common)
 {
 	int i;

 	for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) {
 		if (test_bit(i, common->keymap) ||
 		    test_bit(i + 64, common->keymap))
 			continue; /* At least one part of TKIP key allocated */
 		if (common->splitmic &&
 		    (test_bit(i + 32, common->keymap) ||
 		     test_bit(i + 64 + 32, common->keymap)))
 			continue; /* At least one part of TKIP key allocated */

 		/* Found a free slot for a TKIP key */
 		return i;
 	}
 	return -1;
 }

 static int ath_reserve_key_cache_slot(struct ath_common *common,
 				      enum ieee80211_key_alg alg)
 {
 	int i;

 	if (alg == ALG_TKIP)
 		return ath_reserve_key_cache_slot_tkip(common);

 	/* First, try to find slots that would not be available for TKIP. */
 	if (common->splitmic) {
 		for (i = IEEE80211_WEP_NKID; i < common->keymax / 4; i++) {
 			if (!test_bit(i, common->keymap) &&
 			    (test_bit(i + 32, common->keymap) ||
 			     test_bit(i + 64, common->keymap) ||
 			     test_bit(i + 64 + 32, common->keymap)))
 				return i;
 			if (!test_bit(i + 32, common->keymap) &&
 			    (test_bit(i, common->keymap) ||
 			     test_bit(i + 64, common->keymap) ||
 			     test_bit(i + 64 + 32, common->keymap)))
 				return i + 32;
 			if (!test_bit(i + 64, common->keymap) &&
 			    (test_bit(i , common->keymap) ||
 			     test_bit(i + 32, common->keymap) ||
 			     test_bit(i + 64 + 32, common->keymap)))
 				return i + 64;
 			if (!test_bit(i + 64 + 32, common->keymap) &&
 			    (test_bit(i, common->keymap) ||
 			     test_bit(i + 32, common->keymap) ||
 			     test_bit(i + 64, common->keymap)))
 				return i + 64 + 32;
 		}
 	} else {
 		for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) {
 			if (!test_bit(i, common->keymap) &&
 			    test_bit(i + 64, common->keymap))
 				return i;
 			if (test_bit(i, common->keymap) &&
 			    !test_bit(i + 64, common->keymap))
 				return i + 64;
 		}
 	}

 	/* No partially used TKIP slots, pick any available slot */
 	for (i = IEEE80211_WEP_NKID; i < common->keymax; i++) {
 		/* Do not allow slots that could be needed for TKIP group keys
 		 * to be used. This limitation could be removed if we know that
 		 * TKIP will not be used. */
 		if (i >= 64 && i < 64 + IEEE80211_WEP_NKID)
 			continue;
 		if (common->splitmic) {
 			if (i >= 32 && i < 32 + IEEE80211_WEP_NKID)
 				continue;
 			if (i >= 64 + 32 && i < 64 + 32 + IEEE80211_WEP_NKID)
 				continue;
 		}

 		if (!test_bit(i, common->keymap))
 			return i; /* Found a free slot for a key */
 	}

 	/* No free slot found */
 	return -1;
 }

 /*
  * Configure encryption in the HW.
  */
 int ath9k_cmn_key_config(struct ath_common *common,
 			 struct ieee80211_vif *vif,
 			 struct ieee80211_sta *sta,
 			 struct ieee80211_key_conf *key)
 {
 	struct ath_hw *ah = common->ah;
 	struct ath9k_keyval hk;
 	const u8 *mac = NULL;
 	u8 gmac[ETH_ALEN];
 	int ret = 0;
 	int idx;

 	memset(&hk, 0, sizeof(hk));

 	switch (key->alg) {
 	case ALG_WEP:
 		hk.kv_type = ATH9K_CIPHER_WEP;
 		break;
 	case ALG_TKIP:
 		hk.kv_type = ATH9K_CIPHER_TKIP;
 		break;
 	case ALG_CCMP:
 		hk.kv_type = ATH9K_CIPHER_AES_CCM;
 		break;
 	default:
 		return -EOPNOTSUPP;
 	}

 	hk.kv_len = key->keylen;
 	memcpy(hk.kv_val, key->key, key->keylen);

 	if (!(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 		switch (vif->type) {
 		case NL80211_IFTYPE_AP:
 			memcpy(gmac, vif->addr, ETH_ALEN);
 			gmac[0] |= 0x01;
 			mac = gmac;
 			idx = ath_reserve_key_cache_slot(common, key->alg);
 			break;
 		case NL80211_IFTYPE_ADHOC:
 			memcpy(gmac, sta->addr, ETH_ALEN);
 			gmac[0] |= 0x01;
 			mac = gmac;
 			idx = ath_reserve_key_cache_slot(common, key->alg);
 			break;
 		default:
 			idx = key->keyidx;
 			break;
 		}
 	} else if (key->keyidx) {
 		if (WARN_ON(!sta))
 			return -EOPNOTSUPP;
 		mac = sta->addr;

 		if (vif->type != NL80211_IFTYPE_AP) {
 			/* Only keyidx 0 should be used with unicast key, but
 			 * allow this for client mode for now. */
 			idx = key->keyidx;
 		} else
 			return -EIO;
 	} else {
 		if (WARN_ON(!sta))
 			return -EOPNOTSUPP;
 		mac = sta->addr;

 		idx = ath_reserve_key_cache_slot(common, key->alg);
 	}

 	if (idx < 0)
 		return -ENOSPC; /* no free key cache entries */

 	if (key->alg == ALG_TKIP)
 		ret = ath_setkey_tkip(common, idx, key->key, &hk, mac,
 				      vif->type == NL80211_IFTYPE_AP);
 	else
 		ret = ath9k_hw_set_keycache_entry(ah, idx, &hk, mac);

 	if (!ret)
 		return -EIO;

 	set_bit(idx, common->keymap);
 	if (key->alg == ALG_TKIP) {
 		set_bit(idx + 64, common->keymap);
 		if (common->splitmic) {
 			set_bit(idx + 32, common->keymap);
 			set_bit(idx + 64 + 32, common->keymap);
 		}
 	}

 	return idx;
 }
 EXPORT_SYMBOL(ath9k_cmn_key_config);

 /*
  * Delete Key.
  */
 void ath9k_cmn_key_delete(struct ath_common *common,
 			  struct ieee80211_key_conf *key)
 {
 	struct ath_hw *ah = common->ah;

 	ath9k_hw_keyreset(ah, key->hw_key_idx);
 	if (key->hw_key_idx < IEEE80211_WEP_NKID)
 		return;

 	clear_bit(key->hw_key_idx, common->keymap);
 	if (key->alg != ALG_TKIP)
 		return;

 	clear_bit(key->hw_key_idx + 64, common->keymap);
 	if (common->splitmic) {
 		ath9k_hw_keyreset(ah, key->hw_key_idx + 32);
 		clear_bit(key->hw_key_idx + 32, common->keymap);
 		clear_bit(key->hw_key_idx + 64 + 32, common->keymap);
 	}
 }
 EXPORT_SYMBOL(ath9k_cmn_key_delete);

 static int __init ath9k_cmn_init(void)
 {
 	return 0;
 }
 module_init(ath9k_cmn_init);

 static void __exit ath9k_cmn_exit(void)
 {
 	return;
 }
 module_exit(ath9k_cmn_exit);
	/*
	* Copyright (c) 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.
	*/

	/*
	* Module for common driver code between ath9k and ath9k_htc
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>

	#include "common.h"

	MODULE_AUTHOR("Atheros Communications");
	MODULE_DESCRIPTION("Shared library for Atheros wireless 802.11n LAN cards.");
	MODULE_LICENSE("Dual BSD/GPL");

	int ath9k_cmn_padpos(__le16 frame_control)
	{
	int padpos = 24;
	if (ieee80211_has_a4(frame_control)) {
	padpos += ETH_ALEN;
	}
	if (ieee80211_is_data_qos(frame_control)) {
	padpos += IEEE80211_QOS_CTL_LEN;
	}

	return padpos;
	}
	EXPORT_SYMBOL(ath9k_cmn_padpos);

	int ath9k_cmn_get_hw_crypto_keytype(struct sk_buff *skb)
	{
	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);

	if (tx_info->control.hw_key) {
	if (tx_info->control.hw_key->alg == ALG_WEP)
	return ATH9K_KEY_TYPE_WEP;
	else if (tx_info->control.hw_key->alg == ALG_TKIP)
	return ATH9K_KEY_TYPE_TKIP;
	else if (tx_info->control.hw_key->alg == ALG_CCMP)
	return ATH9K_KEY_TYPE_AES;
	}

	return ATH9K_KEY_TYPE_CLEAR;
	}
	EXPORT_SYMBOL(ath9k_cmn_get_hw_crypto_keytype);

	static u32 ath9k_get_extchanmode(struct ieee80211_channel *chan,
	enum nl80211_channel_type channel_type)
	{
	u32 chanmode = 0;

	switch (chan->band) {
	case IEEE80211_BAND_2GHZ:
	switch (channel_type) {
	case NL80211_CHAN_NO_HT:
	case NL80211_CHAN_HT20:
	chanmode = CHANNEL_G_HT20;
	break;
	case NL80211_CHAN_HT40PLUS:
	chanmode = CHANNEL_G_HT40PLUS;
	break;
	case NL80211_CHAN_HT40MINUS:
	chanmode = CHANNEL_G_HT40MINUS;
	break;
	}
	break;
	case IEEE80211_BAND_5GHZ:
	switch (channel_type) {
	case NL80211_CHAN_NO_HT:
	case NL80211_CHAN_HT20:
	chanmode = CHANNEL_A_HT20;
	break;
	case NL80211_CHAN_HT40PLUS:
	chanmode = CHANNEL_A_HT40PLUS;
	break;
	case NL80211_CHAN_HT40MINUS:
	chanmode = CHANNEL_A_HT40MINUS;
	break;
	}
	break;
	default:
	break;
	}

	return chanmode;
	}

	/*
	* Update internal channel flags.
	*/
	void ath9k_cmn_update_ichannel(struct ieee80211_hw *hw,
	struct ath9k_channel *ichan)
	{
	struct ieee80211_channel *chan = hw->conf.channel;
	struct ieee80211_conf *conf = &hw->conf;

	ichan->channel = chan->center_freq;
	ichan->chan = chan;

	if (chan->band == IEEE80211_BAND_2GHZ) {
	ichan->chanmode = CHANNEL_G;
	ichan->channelFlags = CHANNEL_2GHZ \| CHANNEL_OFDM \| CHANNEL_G;
	} else {
	ichan->chanmode = CHANNEL_A;
	ichan->channelFlags = CHANNEL_5GHZ \| CHANNEL_OFDM;
	}

	if (conf_is_ht(conf))
	ichan->chanmode = ath9k_get_extchanmode(chan,
	conf->channel_type);
	}
	EXPORT_SYMBOL(ath9k_cmn_update_ichannel);

	/*
	* Get the internal channel reference.
	*/
	struct ath9k_channel ath9k_cmn_get_curchannel(struct ieee80211_hw hw,
	struct ath_hw *ah)
	{
	struct ieee80211_channel *curchan = hw->conf.channel;
	struct ath9k_channel *channel;
	u8 chan_idx;

	chan_idx = curchan->hw_value;
	channel = &ah->channels[chan_idx];
	ath9k_cmn_update_ichannel(hw, channel);

	return channel;
	}
	EXPORT_SYMBOL(ath9k_cmn_get_curchannel);

	static int ath_setkey_tkip(struct ath_common common, u16 keyix, const u8 key,
	struct ath9k_keyval hk, const u8 addr,
	bool authenticator)
	{
	struct ath_hw *ah = common->ah;
	const u8 *key_rxmic;
	const u8 *key_txmic;

	key_txmic = key + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
	key_rxmic = key + NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;

	if (addr == NULL) {
	/*
	* Group key installation - only two key cache entries are used
	* regardless of splitmic capability since group key is only
	* used either for TX or RX.
	*/
	if (authenticator) {
	memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
	memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_mic));
	} else {
	memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
	memcpy(hk->kv_txmic, key_rxmic, sizeof(hk->kv_mic));
	}
	return ath9k_hw_set_keycache_entry(ah, keyix, hk, addr);
	}
	if (!common->splitmic) {
	/* TX and RX keys share the same key cache entry. */
	memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
	memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_txmic));
	return ath9k_hw_set_keycache_entry(ah, keyix, hk, addr);
	}

	/* Separate key cache entries for TX and RX */

	/* TX key goes at first index, RX key at +32. */
	memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
	if (!ath9k_hw_set_keycache_entry(ah, keyix, hk, NULL)) {
	/* TX MIC entry failed. No need to proceed further */
	ath_print(common, ATH_DBG_FATAL,
	"Setting TX MIC Key Failed\n");
	return 0;
	}

	memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
	/* XXX delete tx key on failure? */
	return ath9k_hw_set_keycache_entry(ah, keyix + 32, hk, addr);
	}

	static int ath_reserve_key_cache_slot_tkip(struct ath_common *common)
	{
	int i;

	for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) {
	if (test_bit(i, common->keymap) \|\|
	test_bit(i + 64, common->keymap))
	continue; /* At least one part of TKIP key allocated */
	if (common->splitmic &&
	(test_bit(i + 32, common->keymap) \|\|
	test_bit(i + 64 + 32, common->keymap)))
	continue; /* At least one part of TKIP key allocated */

	/* Found a free slot for a TKIP key */
	return i;
	}
	return -1;
	}

	static int ath_reserve_key_cache_slot(struct ath_common *common,
	enum ieee80211_key_alg alg)
	{
	int i;

	if (alg == ALG_TKIP)
	return ath_reserve_key_cache_slot_tkip(common);

	/* First, try to find slots that would not be available for TKIP. */
	if (common->splitmic) {
	for (i = IEEE80211_WEP_NKID; i < common->keymax / 4; i++) {
	if (!test_bit(i, common->keymap) &&
	(test_bit(i + 32, common->keymap) \|\|
	test_bit(i + 64, common->keymap) \|\|
	test_bit(i + 64 + 32, common->keymap)))
	return i;
	if (!test_bit(i + 32, common->keymap) &&
	(test_bit(i, common->keymap) \|\|
	test_bit(i + 64, common->keymap) \|\|
	test_bit(i + 64 + 32, common->keymap)))
	return i + 32;
	if (!test_bit(i + 64, common->keymap) &&
	(test_bit(i , common->keymap) \|\|
	test_bit(i + 32, common->keymap) \|\|
	test_bit(i + 64 + 32, common->keymap)))
	return i + 64;
	if (!test_bit(i + 64 + 32, common->keymap) &&
	(test_bit(i, common->keymap) \|\|
	test_bit(i + 32, common->keymap) \|\|
	test_bit(i + 64, common->keymap)))
	return i + 64 + 32;
	}
	} else {
	for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) {
	if (!test_bit(i, common->keymap) &&
	test_bit(i + 64, common->keymap))
	return i;
	if (test_bit(i, common->keymap) &&
	!test_bit(i + 64, common->keymap))
	return i + 64;
	}
	}

	/* No partially used TKIP slots, pick any available slot */
	for (i = IEEE80211_WEP_NKID; i < common->keymax; i++) {
	/* Do not allow slots that could be needed for TKIP group keys
	* to be used. This limitation could be removed if we know that
	* TKIP will not be used. */
	if (i >= 64 && i < 64 + IEEE80211_WEP_NKID)
	continue;
	if (common->splitmic) {
	if (i >= 32 && i < 32 + IEEE80211_WEP_NKID)
	continue;
	if (i >= 64 + 32 && i < 64 + 32 + IEEE80211_WEP_NKID)
	continue;
	}

	if (!test_bit(i, common->keymap))
	return i; /* Found a free slot for a key */
	}

	/* No free slot found */
	return -1;
	}

	/*
	* Configure encryption in the HW.
	*/
	int ath9k_cmn_key_config(struct ath_common *common,
	struct ieee80211_vif *vif,
	struct ieee80211_sta *sta,
	struct ieee80211_key_conf *key)
	{
	struct ath_hw *ah = common->ah;
	struct ath9k_keyval hk;
	const u8 *mac = NULL;
	u8 gmac[ETH_ALEN];
	int ret = 0;
	int idx;

	memset(&hk, 0, sizeof(hk));

	switch (key->alg) {
	case ALG_WEP:
	hk.kv_type = ATH9K_CIPHER_WEP;
	break;
	case ALG_TKIP:
	hk.kv_type = ATH9K_CIPHER_TKIP;
	break;
	case ALG_CCMP:
	hk.kv_type = ATH9K_CIPHER_AES_CCM;
	break;
	default:
	return -EOPNOTSUPP;
	}

	hk.kv_len = key->keylen;
	memcpy(hk.kv_val, key->key, key->keylen);

	if (!(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
	switch (vif->type) {
	case NL80211_IFTYPE_AP:
	memcpy(gmac, vif->addr, ETH_ALEN);
	gmac[0] \|= 0x01;
	mac = gmac;
	idx = ath_reserve_key_cache_slot(common, key->alg);
	break;
	case NL80211_IFTYPE_ADHOC:
	memcpy(gmac, sta->addr, ETH_ALEN);
	gmac[0] \|= 0x01;
	mac = gmac;
	idx = ath_reserve_key_cache_slot(common, key->alg);
	break;
	default:
	idx = key->keyidx;
	break;
	}
	} else if (key->keyidx) {
	if (WARN_ON(!sta))
	return -EOPNOTSUPP;
	mac = sta->addr;

	if (vif->type != NL80211_IFTYPE_AP) {
	/* Only keyidx 0 should be used with unicast key, but
	* allow this for client mode for now. */
	idx = key->keyidx;
	} else
	return -EIO;
	} else {
	if (WARN_ON(!sta))
	return -EOPNOTSUPP;
	mac = sta->addr;

	idx = ath_reserve_key_cache_slot(common, key->alg);
	}

	if (idx < 0)
	return -ENOSPC; /* no free key cache entries */

	if (key->alg == ALG_TKIP)
	ret = ath_setkey_tkip(common, idx, key->key, &hk, mac,
	vif->type == NL80211_IFTYPE_AP);
	else
	ret = ath9k_hw_set_keycache_entry(ah, idx, &hk, mac);

	if (!ret)
	return -EIO;

	set_bit(idx, common->keymap);
	if (key->alg == ALG_TKIP) {
	set_bit(idx + 64, common->keymap);
	if (common->splitmic) {
	set_bit(idx + 32, common->keymap);
	set_bit(idx + 64 + 32, common->keymap);
	}
	}

	return idx;
	}
	EXPORT_SYMBOL(ath9k_cmn_key_config);

	/*
	* Delete Key.
	*/
	void ath9k_cmn_key_delete(struct ath_common *common,
	struct ieee80211_key_conf *key)
	{
	struct ath_hw *ah = common->ah;

	ath9k_hw_keyreset(ah, key->hw_key_idx);
	if (key->hw_key_idx < IEEE80211_WEP_NKID)
	return;

	clear_bit(key->hw_key_idx, common->keymap);
	if (key->alg != ALG_TKIP)
	return;

	clear_bit(key->hw_key_idx + 64, common->keymap);
	if (common->splitmic) {
	ath9k_hw_keyreset(ah, key->hw_key_idx + 32);
	clear_bit(key->hw_key_idx + 32, common->keymap);
	clear_bit(key->hw_key_idx + 64 + 32, common->keymap);
	}
	}
	EXPORT_SYMBOL(ath9k_cmn_key_delete);

	static int __init ath9k_cmn_init(void)
	{
	return 0;
	}
	module_init(ath9k_cmn_init);

	static void __exit ath9k_cmn_exit(void)
	{
	return;
	}
	module_exit(ath9k_cmn_exit);