/*
   * Copyright (c) 2004-2011 Atheros Communications Inc.
   * Copyright (c) 2011-2012 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.
   */
  
  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  
  #include <linux/moduleparam.h>
  #include <linux/inetdevice.h>
  #include <linux/export.h>
  
  #include "core.h"
  #include "cfg80211.h"
  #include "debug.h"
  #include "hif-ops.h"
  #include "testmode.h"
  
  #define RATETAB_ENT(_rate, _rateid, _flags) {   \
  	.bitrate    = (_rate),                  \
  	.flags      = (_flags),                 \
  	.hw_value   = (_rateid),                \
  }
  
  #define CHAN2G(_channel, _freq, _flags) {   \
  	.band           = IEEE80211_BAND_2GHZ,  \
  	.hw_value       = (_channel),           \
  	.center_freq    = (_freq),              \
  	.flags          = (_flags),             \
  	.max_antenna_gain   = 0,                \
  	.max_power      = 30,                   \
  }
  
  #define CHAN5G(_channel, _flags) {		    \
  	.band           = IEEE80211_BAND_5GHZ,      \
  	.hw_value       = (_channel),               \
  	.center_freq    = 5000 + (5 * (_channel)),  \
  	.flags          = (_flags),                 \
  	.max_antenna_gain   = 0,                    \
  	.max_power      = 30,                       \
  }
  
  #define DEFAULT_BG_SCAN_PERIOD 60
  
  struct ath6kl_cfg80211_match_probe_ssid {
  	struct cfg80211_ssid ssid;
  	u8 flag;
  };
  
  static struct ieee80211_rate ath6kl_rates[] = {
  	RATETAB_ENT(10, 0x1, 0),
  	RATETAB_ENT(20, 0x2, 0),
  	RATETAB_ENT(55, 0x4, 0),
  	RATETAB_ENT(110, 0x8, 0),
  	RATETAB_ENT(60, 0x10, 0),
  	RATETAB_ENT(90, 0x20, 0),
  	RATETAB_ENT(120, 0x40, 0),
  	RATETAB_ENT(180, 0x80, 0),
  	RATETAB_ENT(240, 0x100, 0),
  	RATETAB_ENT(360, 0x200, 0),
  	RATETAB_ENT(480, 0x400, 0),
  	RATETAB_ENT(540, 0x800, 0),
  };
  
  #define ath6kl_a_rates     (ath6kl_rates + 4)
  #define ath6kl_a_rates_size    8
  #define ath6kl_g_rates     (ath6kl_rates + 0)
  #define ath6kl_g_rates_size    12
  
  #define ath6kl_g_htcap IEEE80211_HT_CAP_SGI_20
  #define ath6kl_a_htcap (IEEE80211_HT_CAP_SUP_WIDTH_20_40 | \
  			IEEE80211_HT_CAP_SGI_20		 | \
  			IEEE80211_HT_CAP_SGI_40)
  
  static struct ieee80211_channel ath6kl_2ghz_channels[] = {
  	CHAN2G(1, 2412, 0),
  	CHAN2G(2, 2417, 0),
  	CHAN2G(3, 2422, 0),
  	CHAN2G(4, 2427, 0),
  	CHAN2G(5, 2432, 0),
  	CHAN2G(6, 2437, 0),
  	CHAN2G(7, 2442, 0),
  	CHAN2G(8, 2447, 0),
  	CHAN2G(9, 2452, 0),
  	CHAN2G(10, 2457, 0),
  	CHAN2G(11, 2462, 0),
  	CHAN2G(12, 2467, 0),
  	CHAN2G(13, 2472, 0),
  	CHAN2G(14, 2484, 0),
  };
  
  static struct ieee80211_channel ath6kl_5ghz_a_channels[] = {
  	CHAN5G(34, 0), CHAN5G(36, 0),
  	CHAN5G(38, 0), CHAN5G(40, 0),
  	CHAN5G(42, 0), CHAN5G(44, 0),
  	CHAN5G(46, 0), CHAN5G(48, 0),
  	CHAN5G(52, 0), CHAN5G(56, 0),
  	CHAN5G(60, 0), CHAN5G(64, 0),
  	CHAN5G(100, 0), CHAN5G(104, 0),
  	CHAN5G(108, 0), CHAN5G(112, 0),
  	CHAN5G(116, 0), CHAN5G(120, 0),
  	CHAN5G(124, 0), CHAN5G(128, 0),
  	CHAN5G(132, 0), CHAN5G(136, 0),
  	CHAN5G(140, 0), CHAN5G(149, 0),
  	CHAN5G(153, 0), CHAN5G(157, 0),
  	CHAN5G(161, 0), CHAN5G(165, 0),
  	CHAN5G(184, 0), CHAN5G(188, 0),
  	CHAN5G(192, 0), CHAN5G(196, 0),
  	CHAN5G(200, 0), CHAN5G(204, 0),
  	CHAN5G(208, 0), CHAN5G(212, 0),
  	CHAN5G(216, 0),
  };
  
  static struct ieee80211_supported_band ath6kl_band_2ghz = {
  	.n_channels = ARRAY_SIZE(ath6kl_2ghz_channels),
  	.channels = ath6kl_2ghz_channels,
  	.n_bitrates = ath6kl_g_rates_size,
  	.bitrates = ath6kl_g_rates,
  	.ht_cap.cap = ath6kl_g_htcap,
  	.ht_cap.ht_supported = true,
  };
  
  static struct ieee80211_supported_band ath6kl_band_5ghz = {
  	.n_channels = ARRAY_SIZE(ath6kl_5ghz_a_channels),
  	.channels = ath6kl_5ghz_a_channels,
  	.n_bitrates = ath6kl_a_rates_size,
  	.bitrates = ath6kl_a_rates,
  	.ht_cap.cap = ath6kl_a_htcap,
  	.ht_cap.ht_supported = true,
  };
  
  #define CCKM_KRK_CIPHER_SUITE 0x004096ff /* use for KRK */
  
  /* returns true if scheduled scan was stopped */
  static bool __ath6kl_cfg80211_sscan_stop(struct ath6kl_vif *vif)
  {
  	struct ath6kl *ar = vif->ar;
  
  	if (!test_and_clear_bit(SCHED_SCANNING, &vif->flags))
  		return false;
  
  	del_timer_sync(&vif->sched_scan_timer);
  
  	if (ar->state == ATH6KL_STATE_RECOVERY)
  		return true;
  
  	ath6kl_wmi_enable_sched_scan_cmd(ar->wmi, vif->fw_vif_idx, false);
  
  	return true;
  }
  
  static void ath6kl_cfg80211_sscan_disable(struct ath6kl_vif *vif)
  {
  	struct ath6kl *ar = vif->ar;
  	bool stopped;
  
  	stopped = __ath6kl_cfg80211_sscan_stop(vif);
  
  	if (!stopped)
  		return;
  
  	cfg80211_sched_scan_stopped(ar->wiphy);
  }
  
  static int ath6kl_set_wpa_version(struct ath6kl_vif *vif,
  				  enum nl80211_wpa_versions wpa_version)
  {
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: %u
  ", __func__, wpa_version);
  
  	if (!wpa_version) {
  		vif->auth_mode = NONE_AUTH;
  	} else if (wpa_version & NL80211_WPA_VERSION_2) {
  		vif->auth_mode = WPA2_AUTH;
  	} else if (wpa_version & NL80211_WPA_VERSION_1) {
  		vif->auth_mode = WPA_AUTH;
  	} else {
  		ath6kl_err("%s: %u not supported
  ", __func__, wpa_version);
  		return -ENOTSUPP;
  	}
  
  	return 0;
  }
  
  static int ath6kl_set_auth_type(struct ath6kl_vif *vif,
  				enum nl80211_auth_type auth_type)
  {
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: 0x%x
  ", __func__, auth_type);
  
  	switch (auth_type) {
  	case NL80211_AUTHTYPE_OPEN_SYSTEM:
  		vif->dot11_auth_mode = OPEN_AUTH;
  		break;
  	case NL80211_AUTHTYPE_SHARED_KEY:
  		vif->dot11_auth_mode = SHARED_AUTH;
  		break;
  	case NL80211_AUTHTYPE_NETWORK_EAP:
  		vif->dot11_auth_mode = LEAP_AUTH;
  		break;
  
  	case NL80211_AUTHTYPE_AUTOMATIC:
  		vif->dot11_auth_mode = OPEN_AUTH | SHARED_AUTH;
  		break;
  
  	default:
  		ath6kl_err("%s: 0x%x not supported
  ", __func__, auth_type);
  		return -ENOTSUPP;
  	}
  
  	return 0;
  }
  
  static int ath6kl_set_cipher(struct ath6kl_vif *vif, u32 cipher, bool ucast)
  {
  	u8 *ar_cipher = ucast ? &vif->prwise_crypto : &vif->grp_crypto;
  	u8 *ar_cipher_len = ucast ? &vif->prwise_crypto_len :
  		&vif->grp_crypto_len;
  
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: cipher 0x%x, ucast %u
  ",
  		   __func__, cipher, ucast);
  
  	switch (cipher) {
  	case 0:
  		/* our own hack to use value 0 as no crypto used */
  		*ar_cipher = NONE_CRYPT;
  		*ar_cipher_len = 0;
  		break;
  	case WLAN_CIPHER_SUITE_WEP40:
  		*ar_cipher = WEP_CRYPT;
  		*ar_cipher_len = 5;
  		break;
  	case WLAN_CIPHER_SUITE_WEP104:
  		*ar_cipher = WEP_CRYPT;
  		*ar_cipher_len = 13;
  		break;
  	case WLAN_CIPHER_SUITE_TKIP:
  		*ar_cipher = TKIP_CRYPT;
  		*ar_cipher_len = 0;
  		break;
  	case WLAN_CIPHER_SUITE_CCMP:
  		*ar_cipher = AES_CRYPT;
  		*ar_cipher_len = 0;
  		break;
  	case WLAN_CIPHER_SUITE_SMS4:
  		*ar_cipher = WAPI_CRYPT;
  		*ar_cipher_len = 0;
  		break;
  	default:
  		ath6kl_err("cipher 0x%x not supported
  ", cipher);
  		return -ENOTSUPP;
  	}
  
  	return 0;
  }
  
  static void ath6kl_set_key_mgmt(struct ath6kl_vif *vif, u32 key_mgmt)
  {
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: 0x%x
  ", __func__, key_mgmt);
  
  	if (key_mgmt == WLAN_AKM_SUITE_PSK) {
  		if (vif->auth_mode == WPA_AUTH)
  			vif->auth_mode = WPA_PSK_AUTH;
  		else if (vif->auth_mode == WPA2_AUTH)
  			vif->auth_mode = WPA2_PSK_AUTH;
  	} else if (key_mgmt == 0x00409600) {
  		if (vif->auth_mode == WPA_AUTH)
  			vif->auth_mode = WPA_AUTH_CCKM;
  		else if (vif->auth_mode == WPA2_AUTH)
  			vif->auth_mode = WPA2_AUTH_CCKM;
  	} else if (key_mgmt != WLAN_AKM_SUITE_8021X) {
  		vif->auth_mode = NONE_AUTH;
  	}
  }
  
  static bool ath6kl_cfg80211_ready(struct ath6kl_vif *vif)
  {
  	struct ath6kl *ar = vif->ar;
  
  	if (!test_bit(WMI_READY, &ar->flag)) {
  		ath6kl_err("wmi is not ready
  ");
  		return false;
  	}
  
  	if (!test_bit(WLAN_ENABLED, &vif->flags)) {
  		ath6kl_err("wlan disabled
  ");
  		return false;
  	}
  
  	return true;
  }
  
  static bool ath6kl_is_wpa_ie(const u8 *pos)
  {
  	return pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
  		pos[2] == 0x00 && pos[3] == 0x50 &&
  		pos[4] == 0xf2 && pos[5] == 0x01;
  }
  
  static bool ath6kl_is_rsn_ie(const u8 *pos)
  {
  	return pos[0] == WLAN_EID_RSN;
  }
  
  static bool ath6kl_is_wps_ie(const u8 *pos)
  {
  	return (pos[0] == WLAN_EID_VENDOR_SPECIFIC &&
  		pos[1] >= 4 &&
  		pos[2] == 0x00 && pos[3] == 0x50 && pos[4] == 0xf2 &&
  		pos[5] == 0x04);
  }
  
  static int ath6kl_set_assoc_req_ies(struct ath6kl_vif *vif, const u8 *ies,
  				    size_t ies_len)
  {
  	struct ath6kl *ar = vif->ar;
  	const u8 *pos;
  	u8 *buf = NULL;
  	size_t len = 0;
  	int ret;
  
  	/*
  	 * Clear previously set flag
  	 */
  
  	ar->connect_ctrl_flags &= ~CONNECT_WPS_FLAG;
  
  	/*
  	 * Filter out RSN/WPA IE(s)
  	 */
  
  	if (ies && ies_len) {
  		buf = kmalloc(ies_len, GFP_KERNEL);
  		if (buf == NULL)
  			return -ENOMEM;
  		pos = ies;
  
  		while (pos + 1 < ies + ies_len) {
  			if (pos + 2 + pos[1] > ies + ies_len)
  				break;
  			if (!(ath6kl_is_wpa_ie(pos) || ath6kl_is_rsn_ie(pos))) {
  				memcpy(buf + len, pos, 2 + pos[1]);
  				len += 2 + pos[1];
  			}
  
  			if (ath6kl_is_wps_ie(pos))
  				ar->connect_ctrl_flags |= CONNECT_WPS_FLAG;
  
  			pos += 2 + pos[1];
  		}
  	}
  
  	ret = ath6kl_wmi_set_appie_cmd(ar->wmi, vif->fw_vif_idx,
  				       WMI_FRAME_ASSOC_REQ, buf, len);
  	kfree(buf);
  	return ret;
  }
  
  static int ath6kl_nliftype_to_drv_iftype(enum nl80211_iftype type, u8 *nw_type)
  {
  	switch (type) {
  	case NL80211_IFTYPE_STATION:
  	case NL80211_IFTYPE_P2P_CLIENT:
  		*nw_type = INFRA_NETWORK;
  		break;
  	case NL80211_IFTYPE_ADHOC:
  		*nw_type = ADHOC_NETWORK;
  		break;
  	case NL80211_IFTYPE_AP:
  	case NL80211_IFTYPE_P2P_GO:
  		*nw_type = AP_NETWORK;
  		break;
  	default:
  		ath6kl_err("invalid interface type %u
  ", type);
  		return -ENOTSUPP;
  	}
  
  	return 0;
  }
  
  static bool ath6kl_is_valid_iftype(struct ath6kl *ar, enum nl80211_iftype type,
  				   u8 *if_idx, u8 *nw_type)
  {
  	int i;
  
  	if (ath6kl_nliftype_to_drv_iftype(type, nw_type))
  		return false;
  
  	if (ar->ibss_if_active || ((type == NL80211_IFTYPE_ADHOC) &&
  				   ar->num_vif))
  		return false;
  
  	if (type == NL80211_IFTYPE_STATION ||
  	    type == NL80211_IFTYPE_AP || type == NL80211_IFTYPE_ADHOC) {
  		for (i = 0; i < ar->vif_max; i++) {
  			if ((ar->avail_idx_map) & BIT(i)) {
  				*if_idx = i;
  				return true;
  			}
  		}
  	}
  
  	if (type == NL80211_IFTYPE_P2P_CLIENT ||
  	    type == NL80211_IFTYPE_P2P_GO) {
  		for (i = ar->max_norm_iface; i < ar->vif_max; i++) {
  			if ((ar->avail_idx_map) & BIT(i)) {
  				*if_idx = i;
  				return true;
  			}
  		}
  	}
  
  	return false;
  }
  
  static bool ath6kl_is_tx_pending(struct ath6kl *ar)
  {
  	return ar->tx_pending[ath6kl_wmi_get_control_ep(ar->wmi)] == 0;
  }
  
  static void ath6kl_cfg80211_sta_bmiss_enhance(struct ath6kl_vif *vif,
  					      bool enable)
  {
  	int err;
  
  	if (WARN_ON(!test_bit(WMI_READY, &vif->ar->flag)))
  		return;
  
  	if (vif->nw_type != INFRA_NETWORK)
  		return;
  
  	if (!test_bit(ATH6KL_FW_CAPABILITY_BMISS_ENHANCE,
  		      vif->ar->fw_capabilities))
  		return;
  
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s fw bmiss enhance
  ",
  		   enable ? "enable" : "disable");
  
  	err = ath6kl_wmi_sta_bmiss_enhance_cmd(vif->ar->wmi,
  					       vif->fw_vif_idx, enable);
  	if (err)
  		ath6kl_err("failed to %s enhanced bmiss detection: %d
  ",
  			   enable ? "enable" : "disable", err);
  }
  
  static int ath6kl_cfg80211_connect(struct wiphy *wiphy, struct net_device *dev,
  				   struct cfg80211_connect_params *sme)
  {
  	struct ath6kl *ar = ath6kl_priv(dev);
  	struct ath6kl_vif *vif = netdev_priv(dev);
  	int status;
  	u8 nw_subtype = (ar->p2p) ? SUBTYPE_P2PDEV : SUBTYPE_NONE;
  	u16 interval;
  
  	ath6kl_cfg80211_sscan_disable(vif);
  
  	vif->sme_state = SME_CONNECTING;
  
  	if (!ath6kl_cfg80211_ready(vif))
  		return -EIO;
  
  	if (test_bit(DESTROY_IN_PROGRESS, &ar->flag)) {
  		ath6kl_err("destroy in progress
  ");
  		return -EBUSY;
  	}
  
  	if (test_bit(SKIP_SCAN, &ar->flag) &&
  	    ((sme->channel && sme->channel->center_freq == 0) ||
  	     (sme->bssid && is_zero_ether_addr(sme->bssid)))) {
  		ath6kl_err("SkipScan: channel or bssid invalid
  ");
  		return -EINVAL;
  	}
  
  	if (down_interruptible(&ar->sem)) {
  		ath6kl_err("busy, couldn't get access
  ");
  		return -ERESTARTSYS;
  	}
  
  	if (test_bit(DESTROY_IN_PROGRESS, &ar->flag)) {
  		ath6kl_err("busy, destroy in progress
  ");
  		up(&ar->sem);
  		return -EBUSY;
  	}
  
  	if (ar->tx_pending[ath6kl_wmi_get_control_ep(ar->wmi)]) {
  		/*
  		 * sleep until the command queue drains
  		 */
  		wait_event_interruptible_timeout(ar->event_wq,
  						 ath6kl_is_tx_pending(ar),
  						 WMI_TIMEOUT);
  		if (signal_pending(current)) {
  			ath6kl_err("cmd queue drain timeout
  ");
  			up(&ar->sem);
  			return -EINTR;
  		}
  	}
  
  	status = ath6kl_set_assoc_req_ies(vif, sme->ie, sme->ie_len);
  	if (status) {
  		up(&ar->sem);
  		return status;
  	}
  
  	if (sme->ie == NULL || sme->ie_len == 0)
  		ar->connect_ctrl_flags &= ~CONNECT_WPS_FLAG;
  
  	if (test_bit(CONNECTED, &vif->flags) &&
  	    vif->ssid_len == sme->ssid_len &&
  	    !memcmp(vif->ssid, sme->ssid, vif->ssid_len)) {
  		vif->reconnect_flag = true;
  		status = ath6kl_wmi_reconnect_cmd(ar->wmi, vif->fw_vif_idx,
  						  vif->req_bssid,
  						  vif->ch_hint);
  
  		up(&ar->sem);
  		if (status) {
  			ath6kl_err("wmi_reconnect_cmd failed
  ");
  			return -EIO;
  		}
  		return 0;
  	} else if (vif->ssid_len == sme->ssid_len &&
  		   !memcmp(vif->ssid, sme->ssid, vif->ssid_len)) {
  		ath6kl_disconnect(vif);
  	}
  
  	memset(vif->ssid, 0, sizeof(vif->ssid));
  	vif->ssid_len = sme->ssid_len;
  	memcpy(vif->ssid, sme->ssid, sme->ssid_len);
  
  	if (sme->channel)
  		vif->ch_hint = sme->channel->center_freq;
  
  	memset(vif->req_bssid, 0, sizeof(vif->req_bssid));
  	if (sme->bssid && !is_broadcast_ether_addr(sme->bssid))
  		memcpy(vif->req_bssid, sme->bssid, sizeof(vif->req_bssid));
  
  	ath6kl_set_wpa_version(vif, sme->crypto.wpa_versions);
  
  	status = ath6kl_set_auth_type(vif, sme->auth_type);
  	if (status) {
  		up(&ar->sem);
  		return status;
  	}
  
  	if (sme->crypto.n_ciphers_pairwise)
  		ath6kl_set_cipher(vif, sme->crypto.ciphers_pairwise[0], true);
  	else
  		ath6kl_set_cipher(vif, 0, true);
  
  	ath6kl_set_cipher(vif, sme->crypto.cipher_group, false);
  
  	if (sme->crypto.n_akm_suites)
  		ath6kl_set_key_mgmt(vif, sme->crypto.akm_suites[0]);
  
  	if ((sme->key_len) &&
  	    (vif->auth_mode == NONE_AUTH) &&
  	    (vif->prwise_crypto == WEP_CRYPT)) {
  		struct ath6kl_key *key = NULL;
  
  		if (sme->key_idx > WMI_MAX_KEY_INDEX) {
  			ath6kl_err("key index %d out of bounds
  ",
  				   sme->key_idx);
  			up(&ar->sem);
  			return -ENOENT;
  		}
  
  		key = &vif->keys[sme->key_idx];
  		key->key_len = sme->key_len;
  		memcpy(key->key, sme->key, key->key_len);
  		key->cipher = vif->prwise_crypto;
  		vif->def_txkey_index = sme->key_idx;
  
  		ath6kl_wmi_addkey_cmd(ar->wmi, vif->fw_vif_idx, sme->key_idx,
  				      vif->prwise_crypto,
  				      GROUP_USAGE | TX_USAGE,
  				      key->key_len,
  				      NULL, 0,
  				      key->key, KEY_OP_INIT_VAL, NULL,
  				      NO_SYNC_WMIFLAG);
  	}
  
  	if (!ar->usr_bss_filter) {
  		clear_bit(CLEAR_BSSFILTER_ON_BEACON, &vif->flags);
  		if (ath6kl_wmi_bssfilter_cmd(ar->wmi, vif->fw_vif_idx,
  					     ALL_BSS_FILTER, 0) != 0) {
  			ath6kl_err("couldn't set bss filtering
  ");
  			up(&ar->sem);
  			return -EIO;
  		}
  	}
  
  	vif->nw_type = vif->next_mode;
  
  	/* enable enhanced bmiss detection if applicable */
  	ath6kl_cfg80211_sta_bmiss_enhance(vif, true);
  
  	if (vif->wdev.iftype == NL80211_IFTYPE_P2P_CLIENT)
  		nw_subtype = SUBTYPE_P2PCLIENT;
  
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  		   "%s: connect called with authmode %d dot11 auth %d"
  		   " PW crypto %d PW crypto len %d GRP crypto %d"
  		   " GRP crypto len %d channel hint %u
  ",
  		   __func__,
  		   vif->auth_mode, vif->dot11_auth_mode, vif->prwise_crypto,
  		   vif->prwise_crypto_len, vif->grp_crypto,
  		   vif->grp_crypto_len, vif->ch_hint);
  
  	vif->reconnect_flag = 0;
  
  	if (vif->nw_type == INFRA_NETWORK) {
  		interval = max_t(u16, vif->listen_intvl_t,
  				 ATH6KL_MAX_WOW_LISTEN_INTL);
  		status = ath6kl_wmi_listeninterval_cmd(ar->wmi, vif->fw_vif_idx,
  						       interval,
  						       0);
  		if (status) {
  			ath6kl_err("couldn't set listen intervel
  ");
  			up(&ar->sem);
  			return status;
  		}
  	}
  
  	status = ath6kl_wmi_connect_cmd(ar->wmi, vif->fw_vif_idx, vif->nw_type,
  					vif->dot11_auth_mode, vif->auth_mode,
  					vif->prwise_crypto,
  					vif->prwise_crypto_len,
  					vif->grp_crypto, vif->grp_crypto_len,
  					vif->ssid_len, vif->ssid,
  					vif->req_bssid, vif->ch_hint,
  					ar->connect_ctrl_flags, nw_subtype);
  
  	if (sme->bg_scan_period == 0) {
  		/* disable background scan if period is 0 */
  		sme->bg_scan_period = 0xffff;
  	} else if (sme->bg_scan_period == -1) {
  		/* configure default value if not specified */
  		sme->bg_scan_period = DEFAULT_BG_SCAN_PERIOD;
  	}
  
  	ath6kl_wmi_scanparams_cmd(ar->wmi, vif->fw_vif_idx, 0, 0,
  				  sme->bg_scan_period, 0, 0, 0, 3, 0, 0, 0);
  
  	up(&ar->sem);
  
  	if (status == -EINVAL) {
  		memset(vif->ssid, 0, sizeof(vif->ssid));
  		vif->ssid_len = 0;
  		ath6kl_err("invalid request
  ");
  		return -ENOENT;
  	} else if (status) {
  		ath6kl_err("ath6kl_wmi_connect_cmd failed
  ");
  		return -EIO;
  	}
  
  	if ((!(ar->connect_ctrl_flags & CONNECT_DO_WPA_OFFLOAD)) &&
  	    ((vif->auth_mode == WPA_PSK_AUTH) ||
  	     (vif->auth_mode == WPA2_PSK_AUTH))) {
  		mod_timer(&vif->disconnect_timer,
  			  jiffies + msecs_to_jiffies(DISCON_TIMER_INTVAL));
  	}
  
  	ar->connect_ctrl_flags &= ~CONNECT_DO_WPA_OFFLOAD;
  	set_bit(CONNECT_PEND, &vif->flags);
  
  	return 0;
  }
  
  static struct cfg80211_bss *
  ath6kl_add_bss_if_needed(struct ath6kl_vif *vif,
  			 enum network_type nw_type,
  			 const u8 *bssid,
  			 struct ieee80211_channel *chan,
  			 const u8 *beacon_ie,
  			 size_t beacon_ie_len)
  {
  	struct ath6kl *ar = vif->ar;
  	struct cfg80211_bss *bss;
  	u16 cap_val;
  	enum ieee80211_bss_type bss_type;
  	u8 *ie;
  
  	if (nw_type & ADHOC_NETWORK) {
  		cap_val = WLAN_CAPABILITY_IBSS;
  		bss_type = IEEE80211_BSS_TYPE_IBSS;
  	} else {
  		cap_val = WLAN_CAPABILITY_ESS;
  		bss_type = IEEE80211_BSS_TYPE_ESS;
  	}
  
  	bss = cfg80211_get_bss(ar->wiphy, chan, bssid,
  			       vif->ssid, vif->ssid_len,
  			       bss_type, IEEE80211_PRIVACY_ANY);
  	if (bss == NULL) {
  		/*
  		 * Since cfg80211 may not yet know about the BSS,
  		 * generate a partial entry until the first BSS info
  		 * event becomes available.
  		 *
  		 * Prepend SSID element since it is not included in the Beacon
  		 * IEs from the target.
  		 */
  		ie = kmalloc(2 + vif->ssid_len + beacon_ie_len, GFP_KERNEL);
  		if (ie == NULL)
  			return NULL;
  		ie[0] = WLAN_EID_SSID;
  		ie[1] = vif->ssid_len;
  		memcpy(ie + 2, vif->ssid, vif->ssid_len);
  		memcpy(ie + 2 + vif->ssid_len, beacon_ie, beacon_ie_len);
  		bss = cfg80211_inform_bss(ar->wiphy, chan,
  					  CFG80211_BSS_FTYPE_UNKNOWN,
  					  bssid, 0, cap_val, 100,
  					  ie, 2 + vif->ssid_len + beacon_ie_len,
  					  0, GFP_KERNEL);
  		if (bss)
  			ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  				   "added bss %pM to cfg80211
  ", bssid);
  		kfree(ie);
  	} else {
  		ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "cfg80211 already has a bss
  ");
  	}
  
  	return bss;
  }
  
  void ath6kl_cfg80211_connect_event(struct ath6kl_vif *vif, u16 channel,
  				   u8 *bssid, u16 listen_intvl,
  				   u16 beacon_intvl,
  				   enum network_type nw_type,
  				   u8 beacon_ie_len, u8 assoc_req_len,
  				   u8 assoc_resp_len, u8 *assoc_info)
  {
  	struct ieee80211_channel *chan;
  	struct ath6kl *ar = vif->ar;
  	struct cfg80211_bss *bss;
  
  	/* capinfo + listen interval */
  	u8 assoc_req_ie_offset = sizeof(u16) + sizeof(u16);
  
  	/* capinfo + status code +  associd */
  	u8 assoc_resp_ie_offset = sizeof(u16) + sizeof(u16) + sizeof(u16);
  
  	u8 *assoc_req_ie = assoc_info + beacon_ie_len + assoc_req_ie_offset;
  	u8 *assoc_resp_ie = assoc_info + beacon_ie_len + assoc_req_len +
  	    assoc_resp_ie_offset;
  
  	assoc_req_len -= assoc_req_ie_offset;
  	assoc_resp_len -= assoc_resp_ie_offset;
  
  	/*
  	 * Store Beacon interval here; DTIM period will be available only once
  	 * a Beacon frame from the AP is seen.
  	 */
  	vif->assoc_bss_beacon_int = beacon_intvl;
  	clear_bit(DTIM_PERIOD_AVAIL, &vif->flags);
  
  	if (nw_type & ADHOC_NETWORK) {
  		if (vif->wdev.iftype != NL80211_IFTYPE_ADHOC) {
  			ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  				   "%s: ath6k not in ibss mode
  ", __func__);
  			return;
  		}
  	}
  
  	if (nw_type & INFRA_NETWORK) {
  		if (vif->wdev.iftype != NL80211_IFTYPE_STATION &&
  		    vif->wdev.iftype != NL80211_IFTYPE_P2P_CLIENT) {
  			ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  				   "%s: ath6k not in station mode
  ", __func__);
  			return;
  		}
  	}
  
  	chan = ieee80211_get_channel(ar->wiphy, (int) channel);
  
  	bss = ath6kl_add_bss_if_needed(vif, nw_type, bssid, chan,
  				       assoc_info, beacon_ie_len);
  	if (!bss) {
  		ath6kl_err("could not add cfg80211 bss entry
  ");
  		return;
  	}
  
  	if (nw_type & ADHOC_NETWORK) {
  		ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "ad-hoc %s selected
  ",
  			   nw_type & ADHOC_CREATOR ? "creator" : "joiner");
  		cfg80211_ibss_joined(vif->ndev, bssid, chan, GFP_KERNEL);
  		cfg80211_put_bss(ar->wiphy, bss);
  		return;
  	}
  
  	if (vif->sme_state == SME_CONNECTING) {
  		/* inform connect result to cfg80211 */
  		vif->sme_state = SME_CONNECTED;
  		cfg80211_connect_result(vif->ndev, bssid,
  					assoc_req_ie, assoc_req_len,
  					assoc_resp_ie, assoc_resp_len,
  					WLAN_STATUS_SUCCESS, GFP_KERNEL);
  		cfg80211_put_bss(ar->wiphy, bss);
  	} else if (vif->sme_state == SME_CONNECTED) {
  		/* inform roam event to cfg80211 */
  		cfg80211_roamed_bss(vif->ndev, bss, assoc_req_ie, assoc_req_len,
  				    assoc_resp_ie, assoc_resp_len, GFP_KERNEL);
  	}
  }
  
  static int ath6kl_cfg80211_disconnect(struct wiphy *wiphy,
  				      struct net_device *dev, u16 reason_code)
  {
  	struct ath6kl *ar = ath6kl_priv(dev);
  	struct ath6kl_vif *vif = netdev_priv(dev);
  
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: reason=%u
  ", __func__,
  		   reason_code);
  
  	ath6kl_cfg80211_sscan_disable(vif);
  
  	if (!ath6kl_cfg80211_ready(vif))
  		return -EIO;
  
  	if (test_bit(DESTROY_IN_PROGRESS, &ar->flag)) {
  		ath6kl_err("busy, destroy in progress
  ");
  		return -EBUSY;
  	}
  
  	if (down_interruptible(&ar->sem)) {
  		ath6kl_err("busy, couldn't get access
  ");
  		return -ERESTARTSYS;
  	}
  
  	vif->reconnect_flag = 0;
  	ath6kl_disconnect(vif);
  	memset(vif->ssid, 0, sizeof(vif->ssid));
  	vif->ssid_len = 0;
  
  	if (!test_bit(SKIP_SCAN, &ar->flag))
  		memset(vif->req_bssid, 0, sizeof(vif->req_bssid));
  
  	up(&ar->sem);
  
  	vif->sme_state = SME_DISCONNECTED;
  
  	return 0;
  }
  
  void ath6kl_cfg80211_disconnect_event(struct ath6kl_vif *vif, u8 reason,
  				      u8 *bssid, u8 assoc_resp_len,
  				      u8 *assoc_info, u16 proto_reason)
  {
  	struct ath6kl *ar = vif->ar;
  
  	if (vif->scan_req) {
  		cfg80211_scan_done(vif->scan_req, true);
  		vif->scan_req = NULL;
  	}
  
  	if (vif->nw_type & ADHOC_NETWORK) {
  		if (vif->wdev.iftype != NL80211_IFTYPE_ADHOC)
  			ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  				   "%s: ath6k not in ibss mode
  ", __func__);
  		return;
  	}
  
  	if (vif->nw_type & INFRA_NETWORK) {
  		if (vif->wdev.iftype != NL80211_IFTYPE_STATION &&
  		    vif->wdev.iftype != NL80211_IFTYPE_P2P_CLIENT) {
  			ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  				   "%s: ath6k not in station mode
  ", __func__);
  			return;
  		}
  	}
  
  	clear_bit(CONNECT_PEND, &vif->flags);
  
  	if (vif->sme_state == SME_CONNECTING) {
  		cfg80211_connect_result(vif->ndev,
  					bssid, NULL, 0,
  					NULL, 0,
  					WLAN_STATUS_UNSPECIFIED_FAILURE,
  					GFP_KERNEL);
  	} else if (vif->sme_state == SME_CONNECTED) {
  		cfg80211_disconnected(vif->ndev, proto_reason,
  				      NULL, 0, false, GFP_KERNEL);
  	}
  
  	vif->sme_state = SME_DISCONNECTED;
  
  	/*
  	 * Send a disconnect command to target when a disconnect event is
  	 * received with reason code other than 3 (DISCONNECT_CMD - disconnect
  	 * request from host) to make the firmware stop trying to connect even
  	 * after giving disconnect event. There will be one more disconnect
  	 * event for this disconnect command with reason code DISCONNECT_CMD
  	 * which won't be notified to cfg80211.
  	 */
  	if (reason != DISCONNECT_CMD)
  		ath6kl_wmi_disconnect_cmd(ar->wmi, vif->fw_vif_idx);
  }
  
  static int ath6kl_set_probed_ssids(struct ath6kl *ar,
  				   struct ath6kl_vif *vif,
  				   struct cfg80211_ssid *ssids, int n_ssids,
  				   struct cfg80211_match_set *match_set,
  				   int n_match_ssid)
  {
  	u8 i, j, index_to_add, ssid_found = false;
  	struct ath6kl_cfg80211_match_probe_ssid ssid_list[MAX_PROBED_SSIDS];
  
  	memset(ssid_list, 0, sizeof(ssid_list));
  
  	if (n_ssids > MAX_PROBED_SSIDS ||
  	    n_match_ssid > MAX_PROBED_SSIDS)
  		return -EINVAL;
  
  	for (i = 0; i < n_ssids; i++) {
  		memcpy(ssid_list[i].ssid.ssid,
  		       ssids[i].ssid,
  		       ssids[i].ssid_len);
  		ssid_list[i].ssid.ssid_len = ssids[i].ssid_len;
  
  		if (ssids[i].ssid_len)
  			ssid_list[i].flag = SPECIFIC_SSID_FLAG;
  		else
  			ssid_list[i].flag = ANY_SSID_FLAG;
  
  		if (n_match_ssid == 0)
  			ssid_list[i].flag |= MATCH_SSID_FLAG;
  	}
  
  	index_to_add = i;
  
  	for (i = 0; i < n_match_ssid; i++) {
  		ssid_found = false;
  
  		for (j = 0; j < n_ssids; j++) {
  			if ((match_set[i].ssid.ssid_len ==
  			     ssid_list[j].ssid.ssid_len) &&
  			    (!memcmp(ssid_list[j].ssid.ssid,
  				     match_set[i].ssid.ssid,
  				     match_set[i].ssid.ssid_len))) {
  				ssid_list[j].flag |= MATCH_SSID_FLAG;
  				ssid_found = true;
  				break;
  			}
  		}
  
  		if (ssid_found)
  			continue;
  
  		if (index_to_add >= MAX_PROBED_SSIDS)
  			continue;
  
  		ssid_list[index_to_add].ssid.ssid_len =
  			match_set[i].ssid.ssid_len;
  		memcpy(ssid_list[index_to_add].ssid.ssid,
  		       match_set[i].ssid.ssid,
  		       match_set[i].ssid.ssid_len);
  		ssid_list[index_to_add].flag |= MATCH_SSID_FLAG;
  		index_to_add++;
  	}
  
  	for (i = 0; i < index_to_add; i++) {
  		ath6kl_wmi_probedssid_cmd(ar->wmi, vif->fw_vif_idx, i,
  					  ssid_list[i].flag,
  					  ssid_list[i].ssid.ssid_len,
  					  ssid_list[i].ssid.ssid);
  	}
  
  	/* Make sure no old entries are left behind */
  	for (i = index_to_add; i < MAX_PROBED_SSIDS; i++) {
  		ath6kl_wmi_probedssid_cmd(ar->wmi, vif->fw_vif_idx, i,
  					  DISABLE_SSID_FLAG, 0, NULL);
  	}
  
  	return 0;
  }
  
  static int ath6kl_cfg80211_scan(struct wiphy *wiphy,
  				struct cfg80211_scan_request *request)
  {
  	struct ath6kl_vif *vif = ath6kl_vif_from_wdev(request->wdev);
  	struct ath6kl *ar = ath6kl_priv(vif->ndev);
  	s8 n_channels = 0;
  	u16 *channels = NULL;
  	int ret = 0;
  	u32 force_fg_scan = 0;
  
  	if (!ath6kl_cfg80211_ready(vif))
  		return -EIO;
  
  	ath6kl_cfg80211_sscan_disable(vif);
  
  	if (!ar->usr_bss_filter) {
  		clear_bit(CLEAR_BSSFILTER_ON_BEACON, &vif->flags);
  		ret = ath6kl_wmi_bssfilter_cmd(ar->wmi, vif->fw_vif_idx,
  					       ALL_BSS_FILTER, 0);
  		if (ret) {
  			ath6kl_err("couldn't set bss filtering
  ");
  			return ret;
  		}
  	}
  
  	ret = ath6kl_set_probed_ssids(ar, vif, request->ssids,
  				      request->n_ssids, NULL, 0);
  	if (ret < 0)
  		return ret;
  
  	/* this also clears IE in fw if it's not set */
  	ret = ath6kl_wmi_set_appie_cmd(ar->wmi, vif->fw_vif_idx,
  				       WMI_FRAME_PROBE_REQ,
  				       request->ie, request->ie_len);
  	if (ret) {
  		ath6kl_err("failed to set Probe Request appie for scan
  ");
  		return ret;
  	}
  
  	/*
  	 * Scan only the requested channels if the request specifies a set of
  	 * channels. If the list is longer than the target supports, do not
  	 * configure the list and instead, scan all available channels.
  	 */
  	if (request->n_channels > 0 &&
  	    request->n_channels <= WMI_MAX_CHANNELS) {
  		u8 i;
  
  		n_channels = request->n_channels;
  
  		channels = kzalloc(n_channels * sizeof(u16), GFP_KERNEL);
  		if (channels == NULL) {
  			ath6kl_warn("failed to set scan channels, scan all channels");
  			n_channels = 0;
  		}
  
  		for (i = 0; i < n_channels; i++)
  			channels[i] = request->channels[i]->center_freq;
  	}
  
  	if (test_bit(CONNECTED, &vif->flags))
  		force_fg_scan = 1;
  
  	vif->scan_req = request;
  
  	ret = ath6kl_wmi_beginscan_cmd(ar->wmi, vif->fw_vif_idx,
  				       WMI_LONG_SCAN, force_fg_scan,
  				       false, 0,
  				       ATH6KL_FG_SCAN_INTERVAL,
  				       n_channels, channels,
  				       request->no_cck,
  				       request->rates);
  	if (ret) {
  		ath6kl_err("failed to start scan: %d
  ", ret);
  		vif->scan_req = NULL;
  	}
  
  	kfree(channels);
  
  	return ret;
  }
  
  void ath6kl_cfg80211_scan_complete_event(struct ath6kl_vif *vif, bool aborted)
  {
  	struct ath6kl *ar = vif->ar;
  	int i;
  
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: status%s
  ", __func__,
  		   aborted ? " aborted" : "");
  
  	if (!vif->scan_req)
  		return;
  
  	if (aborted)
  		goto out;
  
  	if (vif->scan_req->n_ssids && vif->scan_req->ssids[0].ssid_len) {
  		for (i = 0; i < vif->scan_req->n_ssids; i++) {
  			ath6kl_wmi_probedssid_cmd(ar->wmi, vif->fw_vif_idx,
  						  i + 1, DISABLE_SSID_FLAG,
  						  0, NULL);
  		}
  	}
  
  out:
  	cfg80211_scan_done(vif->scan_req, aborted);
  	vif->scan_req = NULL;
  }
  
  void ath6kl_cfg80211_ch_switch_notify(struct ath6kl_vif *vif, int freq,
  				      enum wmi_phy_mode mode)
  {
  	struct cfg80211_chan_def chandef;
  
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  		   "channel switch notify nw_type %d freq %d mode %d
  ",
  		   vif->nw_type, freq, mode);
  
  	cfg80211_chandef_create(&chandef,
  				ieee80211_get_channel(vif->ar->wiphy, freq),
  				(mode == WMI_11G_HT20) ?
  					NL80211_CHAN_HT20 : NL80211_CHAN_NO_HT);
  
  	mutex_lock(&vif->wdev.mtx);
  	cfg80211_ch_switch_notify(vif->ndev, &chandef);
  	mutex_unlock(&vif->wdev.mtx);
  }
  
  static int ath6kl_cfg80211_add_key(struct wiphy *wiphy, struct net_device *ndev,
  				   u8 key_index, bool pairwise,
  				   const u8 *mac_addr,
  				   struct key_params *params)
  {
  	struct ath6kl *ar = ath6kl_priv(ndev);
  	struct ath6kl_vif *vif = netdev_priv(ndev);
  	struct ath6kl_key *key = NULL;
  	int seq_len;
  	u8 key_usage;
  	u8 key_type;
  
  	if (!ath6kl_cfg80211_ready(vif))
  		return -EIO;
  
  	if (params->cipher == CCKM_KRK_CIPHER_SUITE) {
  		if (params->key_len != WMI_KRK_LEN)
  			return -EINVAL;
  		return ath6kl_wmi_add_krk_cmd(ar->wmi, vif->fw_vif_idx,
  					      params->key);
  	}
  
  	if (key_index > WMI_MAX_KEY_INDEX) {
  		ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  			   "%s: key index %d out of bounds
  ", __func__,
  			   key_index);
  		return -ENOENT;
  	}
  
  	key = &vif->keys[key_index];
  	memset(key, 0, sizeof(struct ath6kl_key));
  
  	if (pairwise)
  		key_usage = PAIRWISE_USAGE;
  	else
  		key_usage = GROUP_USAGE;
  
  	seq_len = params->seq_len;
  	if (params->cipher == WLAN_CIPHER_SUITE_SMS4 &&
  	    seq_len > ATH6KL_KEY_SEQ_LEN) {
  		/* Only first half of the WPI PN is configured */
  		seq_len = ATH6KL_KEY_SEQ_LEN;
  	}
  	if (params->key_len > WLAN_MAX_KEY_LEN ||
  	    seq_len > sizeof(key->seq))
  		return -EINVAL;
  
  	key->key_len = params->key_len;
  	memcpy(key->key, params->key, key->key_len);
  	key->seq_len = seq_len;
  	memcpy(key->seq, params->seq, key->seq_len);
  	key->cipher = params->cipher;
  
  	switch (key->cipher) {
  	case WLAN_CIPHER_SUITE_WEP40:
  	case WLAN_CIPHER_SUITE_WEP104:
  		key_type = WEP_CRYPT;
  		break;
  
  	case WLAN_CIPHER_SUITE_TKIP:
  		key_type = TKIP_CRYPT;
  		break;
  
  	case WLAN_CIPHER_SUITE_CCMP:
  		key_type = AES_CRYPT;
  		break;
  	case WLAN_CIPHER_SUITE_SMS4:
  		key_type = WAPI_CRYPT;
  		break;
  
  	default:
  		return -ENOTSUPP;
  	}
  
  	if (((vif->auth_mode == WPA_PSK_AUTH) ||
  	     (vif->auth_mode == WPA2_PSK_AUTH)) &&
  	    (key_usage & GROUP_USAGE))
  		del_timer(&vif->disconnect_timer);
  
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  		   "%s: index %d, key_len %d, key_type 0x%x, key_usage 0x%x, seq_len %d
  ",
  		   __func__, key_index, key->key_len, key_type,
  		   key_usage, key->seq_len);
  
  	if (vif->nw_type == AP_NETWORK && !pairwise &&
  	    (key_type == TKIP_CRYPT || key_type == AES_CRYPT ||
  	     key_type == WAPI_CRYPT)) {
  		ar->ap_mode_bkey.valid = true;
  		ar->ap_mode_bkey.key_index = key_index;
  		ar->ap_mode_bkey.key_type = key_type;
  		ar->ap_mode_bkey.key_len = key->key_len;
  		memcpy(ar->ap_mode_bkey.key, key->key, key->key_len);
  		if (!test_bit(CONNECTED, &vif->flags)) {
  			ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  				   "Delay initial group key configuration until AP mode has been started
  ");
  			/*
  			 * The key will be set in ath6kl_connect_ap_mode() once
  			 * the connected event is received from the target.
  			 */
  			return 0;
  		}
  	}
  
  	if (vif->next_mode == AP_NETWORK && key_type == WEP_CRYPT &&
  	    !test_bit(CONNECTED, &vif->flags)) {
  		/*
  		 * Store the key locally so that it can be re-configured after
  		 * the AP mode has properly started
  		 * (ath6kl_install_statioc_wep_keys).
  		 */
  		ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  			   "Delay WEP key configuration until AP mode has been started
  ");
  		vif->wep_key_list[key_index].key_len = key->key_len;
  		memcpy(vif->wep_key_list[key_index].key, key->key,
  		       key->key_len);
  		return 0;
  	}
  
  	return ath6kl_wmi_addkey_cmd(ar->wmi, vif->fw_vif_idx, key_index,
  				     key_type, key_usage, key->key_len,
  				     key->seq, key->seq_len, key->key,
  				     KEY_OP_INIT_VAL,
  				     (u8 *) mac_addr, SYNC_BOTH_WMIFLAG);
  }
  
  static int ath6kl_cfg80211_del_key(struct wiphy *wiphy, struct net_device *ndev,
  				   u8 key_index, bool pairwise,
  				   const u8 *mac_addr)
  {
  	struct ath6kl *ar = ath6kl_priv(ndev);
  	struct ath6kl_vif *vif = netdev_priv(ndev);
  
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: index %d
  ", __func__, key_index);
  
  	if (!ath6kl_cfg80211_ready(vif))
  		return -EIO;
  
  	if (key_index > WMI_MAX_KEY_INDEX) {
  		ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  			   "%s: key index %d out of bounds
  ", __func__,
  			   key_index);
  		return -ENOENT;
  	}
  
  	if (!vif->keys[key_index].key_len) {
  		ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  			   "%s: index %d is empty
  ", __func__, key_index);
  		return 0;
  	}
  
  	vif->keys[key_index].key_len = 0;
  
  	return ath6kl_wmi_deletekey_cmd(ar->wmi, vif->fw_vif_idx, key_index);
  }
  
  static int ath6kl_cfg80211_get_key(struct wiphy *wiphy, struct net_device *ndev,
  				   u8 key_index, bool pairwise,
  				   const u8 *mac_addr, void *cookie,
  				   void (*callback) (void *cookie,
  						     struct key_params *))
  {
  	struct ath6kl_vif *vif = netdev_priv(ndev);
  	struct ath6kl_key *key = NULL;
  	struct key_params params;
  
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: index %d
  ", __func__, key_index);
  
  	if (!ath6kl_cfg80211_ready(vif))
  		return -EIO;
  
  	if (key_index > WMI_MAX_KEY_INDEX) {
  		ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  			   "%s: key index %d out of bounds
  ", __func__,
  			   key_index);
  		return -ENOENT;
  	}
  
  	key = &vif->keys[key_index];
  	memset(&params, 0, sizeof(params));
  	params.cipher = key->cipher;
  	params.key_len = key->key_len;
  	params.seq_len = key->seq_len;
  	params.seq = key->seq;
  	params.key = key->key;
  
  	callback(cookie, &params);
  
  	return key->key_len ? 0 : -ENOENT;
  }
  
  static int ath6kl_cfg80211_set_default_key(struct wiphy *wiphy,
  					   struct net_device *ndev,
  					   u8 key_index, bool unicast,
  					   bool multicast)
  {
  	struct ath6kl *ar = ath6kl_priv(ndev);
  	struct ath6kl_vif *vif = netdev_priv(ndev);
  	struct ath6kl_key *key = NULL;
  	u8 key_usage;
  	enum crypto_type key_type = NONE_CRYPT;
  
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: index %d
  ", __func__, key_index);
  
  	if (!ath6kl_cfg80211_ready(vif))
  		return -EIO;
  
  	if (key_index > WMI_MAX_KEY_INDEX) {
  		ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  			   "%s: key index %d out of bounds
  ",
  			   __func__, key_index);
  		return -ENOENT;
  	}
  
  	if (!vif->keys[key_index].key_len) {
  		ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: invalid key index %d
  ",
  			   __func__, key_index);
  		return -EINVAL;
  	}
  
  	vif->def_txkey_index = key_index;
  	key = &vif->keys[vif->def_txkey_index];
  	key_usage = GROUP_USAGE;
  	if (vif->prwise_crypto == WEP_CRYPT)
  		key_usage |= TX_USAGE;
  	if (unicast)
  		key_type = vif->prwise_crypto;
  	if (multicast)
  		key_type = vif->grp_crypto;
  
  	if (vif->next_mode == AP_NETWORK && !test_bit(CONNECTED, &vif->flags))
  		return 0; /* Delay until AP mode has been started */
  
  	return ath6kl_wmi_addkey_cmd(ar->wmi, vif->fw_vif_idx,
  				     vif->def_txkey_index,
  				     key_type, key_usage,
  				     key->key_len, key->seq, key->seq_len,
  				     key->key,
  				     KEY_OP_INIT_VAL, NULL,
  				     SYNC_BOTH_WMIFLAG);
  }
  
  void ath6kl_cfg80211_tkip_micerr_event(struct ath6kl_vif *vif, u8 keyid,
  				       bool ismcast)
  {
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  		   "%s: keyid %d, ismcast %d
  ", __func__, keyid, ismcast);
  
  	cfg80211_michael_mic_failure(vif->ndev, vif->bssid,
  				     (ismcast ? NL80211_KEYTYPE_GROUP :
  				      NL80211_KEYTYPE_PAIRWISE), keyid, NULL,
  				     GFP_KERNEL);
  }
  
  static int ath6kl_cfg80211_set_wiphy_params(struct wiphy *wiphy, u32 changed)
  {
  	struct ath6kl *ar = (struct ath6kl *)wiphy_priv(wiphy);
  	struct ath6kl_vif *vif;
  	int ret;
  
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: changed 0x%x
  ", __func__,
  		   changed);
  
  	vif = ath6kl_vif_first(ar);
  	if (!vif)
  		return -EIO;
  
  	if (!ath6kl_cfg80211_ready(vif))
  		return -EIO;
  
  	if (changed & WIPHY_PARAM_RTS_THRESHOLD) {
  		ret = ath6kl_wmi_set_rts_cmd(ar->wmi, wiphy->rts_threshold);
  		if (ret != 0) {
  			ath6kl_err("ath6kl_wmi_set_rts_cmd failed
  ");
  			return -EIO;
  		}
  	}
  
  	return 0;
  }
  
  static int ath6kl_cfg80211_set_txpower(struct wiphy *wiphy,
  				       struct wireless_dev *wdev,
  				       enum nl80211_tx_power_setting type,
  				       int mbm)
  {
  	struct ath6kl *ar = (struct ath6kl *)wiphy_priv(wiphy);
  	struct ath6kl_vif *vif;
  	int dbm = MBM_TO_DBM(mbm);
  
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: type 0x%x, dbm %d
  ", __func__,
  		   type, dbm);
  
  	vif = ath6kl_vif_first(ar);
  	if (!vif)
  		return -EIO;
  
  	if (!ath6kl_cfg80211_ready(vif))
  		return -EIO;
  
  	switch (type) {
  	case NL80211_TX_POWER_AUTOMATIC:
  		return 0;
  	case NL80211_TX_POWER_LIMITED:
  		ar->tx_pwr = dbm;
  		break;
  	default:
  		ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: type 0x%x not supported
  ",
  			   __func__, type);
  		return -EOPNOTSUPP;
  	}
  
  	ath6kl_wmi_set_tx_pwr_cmd(ar->wmi, vif->fw_vif_idx, dbm);
  
  	return 0;
  }
  
  static int ath6kl_cfg80211_get_txpower(struct wiphy *wiphy,
  				       struct wireless_dev *wdev,
  				       int *dbm)
  {
  	struct ath6kl *ar = (struct ath6kl *)wiphy_priv(wiphy);
  	struct ath6kl_vif *vif;
  
  	vif = ath6kl_vif_first(ar);
  	if (!vif)
  		return -EIO;
  
  	if (!ath6kl_cfg80211_ready(vif))
  		return -EIO;
  
  	if (test_bit(CONNECTED, &vif->flags)) {
  		ar->tx_pwr = 0;
  
  		if (ath6kl_wmi_get_tx_pwr_cmd(ar->wmi, vif->fw_vif_idx) != 0) {
  			ath6kl_err("ath6kl_wmi_get_tx_pwr_cmd failed
  ");
  			return -EIO;
  		}
  
  		wait_event_interruptible_timeout(ar->event_wq, ar->tx_pwr != 0,
  						 5 * HZ);
  
  		if (signal_pending(current)) {
  			ath6kl_err("target did not respond
  ");
  			return -EINTR;
  		}
  	}
  
  	*dbm = ar->tx_pwr;
  	return 0;
  }
  
  static int ath6kl_cfg80211_set_power_mgmt(struct wiphy *wiphy,
  					  struct net_device *dev,
  					  bool pmgmt, int timeout)
  {
  	struct ath6kl *ar = ath6kl_priv(dev);
  	struct wmi_power_mode_cmd mode;
  	struct ath6kl_vif *vif = netdev_priv(dev);
  
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: pmgmt %d, timeout %d
  ",
  		   __func__, pmgmt, timeout);
  
  	if (!ath6kl_cfg80211_ready(vif))
  		return -EIO;
  
  	if (pmgmt) {
  		ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: rec power
  ", __func__);
  		mode.pwr_mode = REC_POWER;
  	} else {
  		ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: max perf
  ", __func__);
  		mode.pwr_mode = MAX_PERF_POWER;
  	}
  
  	if (ath6kl_wmi_powermode_cmd(ar->wmi, vif->fw_vif_idx,
  				     mode.pwr_mode) != 0) {
  		ath6kl_err("wmi_powermode_cmd failed
  ");
  		return -EIO;
  	}
  
  	return 0;
  }
  
  static struct wireless_dev *ath6kl_cfg80211_add_iface(struct wiphy *wiphy,
  						      const char *name,
  						      unsigned char name_assign_type,
  						      enum nl80211_iftype type,
  						      u32 *flags,
  						      struct vif_params *params)
  {
  	struct ath6kl *ar = wiphy_priv(wiphy);
  	struct wireless_dev *wdev;
  	u8 if_idx, nw_type;
  
  	if (ar->num_vif == ar->vif_max) {
  		ath6kl_err("Reached maximum number of supported vif
  ");
  		return ERR_PTR(-EINVAL);
  	}
  
  	if (!ath6kl_is_valid_iftype(ar, type, &if_idx, &nw_type)) {
  		ath6kl_err("Not a supported interface type
  ");
  		return ERR_PTR(-EINVAL);
  	}
  
  	wdev = ath6kl_interface_add(ar, name, name_assign_type, type, if_idx, nw_type);
  	if (!wdev)
  		return ERR_PTR(-ENOMEM);
  
  	ar->num_vif++;
  
  	return wdev;
  }
  
  static int ath6kl_cfg80211_del_iface(struct wiphy *wiphy,
  				     struct wireless_dev *wdev)
  {
  	struct ath6kl *ar = wiphy_priv(wiphy);
  	struct ath6kl_vif *vif = netdev_priv(wdev->netdev);
  
  	spin_lock_bh(&ar->list_lock);
  	list_del(&vif->list);
  	spin_unlock_bh(&ar->list_lock);
  
  	ath6kl_cfg80211_vif_stop(vif, test_bit(WMI_READY, &ar->flag));
  
  	rtnl_lock();
  	ath6kl_cfg80211_vif_cleanup(vif);
  	rtnl_unlock();
  
  	return 0;
  }
  
  static int ath6kl_cfg80211_change_iface(struct wiphy *wiphy,
  					struct net_device *ndev,
  					enum nl80211_iftype type, u32 *flags,
  					struct vif_params *params)
  {
  	struct ath6kl_vif *vif = netdev_priv(ndev);
  	int i;
  
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: type %u
  ", __func__, type);
  
  	/*
  	 * Don't bring up p2p on an interface which is not initialized
  	 * for p2p operation where fw does not have capability to switch
  	 * dynamically between non-p2p and p2p type interface.
  	 */
  	if (!test_bit(ATH6KL_FW_CAPABILITY_STA_P2PDEV_DUPLEX,
  		      vif->ar->fw_capabilities) &&
  	    (type == NL80211_IFTYPE_P2P_CLIENT ||
  	     type == NL80211_IFTYPE_P2P_GO)) {
  		if (vif->ar->vif_max == 1) {
  			if (vif->fw_vif_idx != 0)
  				return -EINVAL;
  			else
  				goto set_iface_type;
  		}
  
  		for (i = vif->ar->max_norm_iface; i < vif->ar->vif_max; i++) {
  			if (i == vif->fw_vif_idx)
  				break;
  		}
  
  		if (i == vif->ar->vif_max) {
  			ath6kl_err("Invalid interface to bring up P2P
  ");
  			return -EINVAL;
  		}
  	}
  
  	/* need to clean up enhanced bmiss detection fw state */
  	ath6kl_cfg80211_sta_bmiss_enhance(vif, false);
  
  set_iface_type:
  	switch (type) {
  	case NL80211_IFTYPE_STATION:
  	case NL80211_IFTYPE_P2P_CLIENT:
  		vif->next_mode = INFRA_NETWORK;
  		break;
  	case NL80211_IFTYPE_ADHOC:
  		vif->next_mode = ADHOC_NETWORK;
  		break;
  	case NL80211_IFTYPE_AP:
  	case NL80211_IFTYPE_P2P_GO:
  		vif->next_mode = AP_NETWORK;
  		break;
  	default:
  		ath6kl_err("invalid interface type %u
  ", type);
  		return -EOPNOTSUPP;
  	}
  
  	vif->wdev.iftype = type;
  
  	return 0;
  }
  
  static int ath6kl_cfg80211_join_ibss(struct wiphy *wiphy,
  				     struct net_device *dev,
  				     struct cfg80211_ibss_params *ibss_param)
  {
  	struct ath6kl *ar = ath6kl_priv(dev);
  	struct ath6kl_vif *vif = netdev_priv(dev);
  	int status;
  
  	if (!ath6kl_cfg80211_ready(vif))
  		return -EIO;
  
  	vif->ssid_len = ibss_param->ssid_len;
  	memcpy(vif->ssid, ibss_param->ssid, vif->ssid_len);
  
  	if (ibss_param->chandef.chan)
  		vif->ch_hint = ibss_param->chandef.chan->center_freq;
  
  	if (ibss_param->channel_fixed) {
  		/*
  		 * TODO: channel_fixed: The channel should be fixed, do not
  		 * search for IBSSs to join on other channels. Target
  		 * firmware does not support this feature, needs to be
  		 * updated.
  		 */
  		return -EOPNOTSUPP;
  	}
  
  	memset(vif->req_bssid, 0, sizeof(vif->req_bssid));
  	if (ibss_param->bssid && !is_broadcast_ether_addr(ibss_param->bssid))
  		memcpy(vif->req_bssid, ibss_param->bssid,
  		       sizeof(vif->req_bssid));
  
  	ath6kl_set_wpa_version(vif, 0);
  
  	status = ath6kl_set_auth_type(vif, NL80211_AUTHTYPE_OPEN_SYSTEM);
  	if (status)
  		return status;
  
  	if (ibss_param->privacy) {
  		ath6kl_set_cipher(vif, WLAN_CIPHER_SUITE_WEP40, true);
  		ath6kl_set_cipher(vif, WLAN_CIPHER_SUITE_WEP40, false);
  	} else {
  		ath6kl_set_cipher(vif, 0, true);
  		ath6kl_set_cipher(vif, 0, false);
  	}
  
  	vif->nw_type = vif->next_mode;
  
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  		   "%s: connect called with authmode %d dot11 auth %d"
  		   " PW crypto %d PW crypto len %d GRP crypto %d"
  		   " GRP crypto len %d channel hint %u
  ",
  		   __func__,
  		   vif->auth_mode, vif->dot11_auth_mode, vif->prwise_crypto,
  		   vif->prwise_crypto_len, vif->grp_crypto,
  		   vif->grp_crypto_len, vif->ch_hint);
  
  	status = ath6kl_wmi_connect_cmd(ar->wmi, vif->fw_vif_idx, vif->nw_type,
  					vif->dot11_auth_mode, vif->auth_mode,
  					vif->prwise_crypto,
  					vif->prwise_crypto_len,
  					vif->grp_crypto, vif->grp_crypto_len,
  					vif->ssid_len, vif->ssid,
  					vif->req_bssid, vif->ch_hint,
  					ar->connect_ctrl_flags, SUBTYPE_NONE);
  	set_bit(CONNECT_PEND, &vif->flags);
  
  	return 0;
  }
  
  static int ath6kl_cfg80211_leave_ibss(struct wiphy *wiphy,
  				      struct net_device *dev)
  {
  	struct ath6kl_vif *vif = netdev_priv(dev);
  
  	if (!ath6kl_cfg80211_ready(vif))
  		return -EIO;
  
  	ath6kl_disconnect(vif);
  	memset(vif->ssid, 0, sizeof(vif->ssid));
  	vif->ssid_len = 0;
  
  	return 0;
  }
  
  static const u32 cipher_suites[] = {
  	WLAN_CIPHER_SUITE_WEP40,
  	WLAN_CIPHER_SUITE_WEP104,
  	WLAN_CIPHER_SUITE_TKIP,
  	WLAN_CIPHER_SUITE_CCMP,
  	CCKM_KRK_CIPHER_SUITE,
  	WLAN_CIPHER_SUITE_SMS4,
  };
  
  static bool is_rate_legacy(s32 rate)
  {
  	static const s32 legacy[] = { 1000, 2000, 5500, 11000,
  		6000, 9000, 12000, 18000, 24000,
  		36000, 48000, 54000
  	};
  	u8 i;
  
  	for (i = 0; i < ARRAY_SIZE(legacy); i++)
  		if (rate == legacy[i])
  			return true;
  
  	return false;
  }
  
  static bool is_rate_ht20(s32 rate, u8 *mcs, bool *sgi)
  {
  	static const s32 ht20[] = { 6500, 13000, 19500, 26000, 39000,
  		52000, 58500, 65000, 72200
  	};
  	u8 i;
  
  	for (i = 0; i < ARRAY_SIZE(ht20); i++) {
  		if (rate == ht20[i]) {
  			if (i == ARRAY_SIZE(ht20) - 1)
  				/* last rate uses sgi */
  				*sgi = true;
  			else
  				*sgi = false;
  
  			*mcs = i;
  			return true;
  		}
  	}
  	return false;
  }
  
  static bool is_rate_ht40(s32 rate, u8 *mcs, bool *sgi)
  {
  	static const s32 ht40[] = { 13500, 27000, 40500, 54000,
  		81000, 108000, 121500, 135000,
  		150000
  	};
  	u8 i;
  
  	for (i = 0; i < ARRAY_SIZE(ht40); i++) {
  		if (rate == ht40[i]) {
  			if (i == ARRAY_SIZE(ht40) - 1)
  				/* last rate uses sgi */
  				*sgi = true;
  			else
  				*sgi = false;
  
  			*mcs = i;
  			return true;
  		}
  	}
  
  	return false;
  }
  
  static int ath6kl_get_station(struct wiphy *wiphy, struct net_device *dev,
  			      const u8 *mac, struct station_info *sinfo)
  {
  	struct ath6kl *ar = ath6kl_priv(dev);
  	struct ath6kl_vif *vif = netdev_priv(dev);
  	long left;
  	bool sgi;
  	s32 rate;
  	int ret;
  	u8 mcs;
  
  	if (memcmp(mac, vif->bssid, ETH_ALEN) != 0)
  		return -ENOENT;
  
  	if (down_interruptible(&ar->sem))
  		return -EBUSY;
  
  	set_bit(STATS_UPDATE_PEND, &vif->flags);
  
  	ret = ath6kl_wmi_get_stats_cmd(ar->wmi, vif->fw_vif_idx);
  
  	if (ret != 0) {
  		up(&ar->sem);
  		return -EIO;
  	}
  
  	left = wait_event_interruptible_timeout(ar->event_wq,
  						!test_bit(STATS_UPDATE_PEND,
  							  &vif->flags),
  						WMI_TIMEOUT);
  
  	up(&ar->sem);
  
  	if (left == 0)
  		return -ETIMEDOUT;
  	else if (left < 0)
  		return left;
  
  	if (vif->target_stats.rx_byte) {
  		sinfo->rx_bytes = vif->target_stats.rx_byte;
  		sinfo->filled |= BIT(NL80211_STA_INFO_RX_BYTES64);
  		sinfo->rx_packets = vif->target_stats.rx_pkt;
  		sinfo->filled |= BIT(NL80211_STA_INFO_RX_PACKETS);
  	}
  
  	if (vif->target_stats.tx_byte) {
  		sinfo->tx_bytes = vif->target_stats.tx_byte;
  		sinfo->filled |= BIT(NL80211_STA_INFO_TX_BYTES64);
  		sinfo->tx_packets = vif->target_stats.tx_pkt;
  		sinfo->filled |= BIT(NL80211_STA_INFO_TX_PACKETS);
  	}
  
  	sinfo->signal = vif->target_stats.cs_rssi;
  	sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL);
  
  	rate = vif->target_stats.tx_ucast_rate;
  
  	if (is_rate_legacy(rate)) {
  		sinfo->txrate.legacy = rate / 100;
  	} else if (is_rate_ht20(rate, &mcs, &sgi)) {
  		if (sgi) {
  			sinfo->txrate.flags |= RATE_INFO_FLAGS_SHORT_GI;
  			sinfo->txrate.mcs = mcs - 1;
  		} else {
  			sinfo->txrate.mcs = mcs;
  		}
  
  		sinfo->txrate.flags |= RATE_INFO_FLAGS_MCS;
  		sinfo->txrate.bw = RATE_INFO_BW_20;
  	} else if (is_rate_ht40(rate, &mcs, &sgi)) {
  		if (sgi) {
  			sinfo->txrate.flags |= RATE_INFO_FLAGS_SHORT_GI;
  			sinfo->txrate.mcs = mcs - 1;
  		} else {
  			sinfo->txrate.mcs = mcs;
  		}
  
  		sinfo->txrate.bw = RATE_INFO_BW_40;
  		sinfo->txrate.flags |= RATE_INFO_FLAGS_MCS;
  	} else {
  		ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  			   "invalid rate from stats: %d
  ", rate);
  		ath6kl_debug_war(ar, ATH6KL_WAR_INVALID_RATE);
  		return 0;
  	}
  
  	sinfo->filled |= BIT(NL80211_STA_INFO_TX_BITRATE);
  
  	if (test_bit(CONNECTED, &vif->flags) &&
  	    test_bit(DTIM_PERIOD_AVAIL, &vif->flags) &&
  	    vif->nw_type == INFRA_NETWORK) {
  		sinfo->filled |= BIT(NL80211_STA_INFO_BSS_PARAM);
  		sinfo->bss_param.flags = 0;
  		sinfo->bss_param.dtim_period = vif->assoc_bss_dtim_period;
  		sinfo->bss_param.beacon_interval = vif->assoc_bss_beacon_int;
  	}
  
  	return 0;
  }
  
  static int ath6kl_set_pmksa(struct wiphy *wiphy, struct net_device *netdev,
  			    struct cfg80211_pmksa *pmksa)
  {
  	struct ath6kl *ar = ath6kl_priv(netdev);
  	struct ath6kl_vif *vif = netdev_priv(netdev);
  
  	return ath6kl_wmi_setpmkid_cmd(ar->wmi, vif->fw_vif_idx, pmksa->bssid,
  				       pmksa->pmkid, true);
  }
  
  static int ath6kl_del_pmksa(struct wiphy *wiphy, struct net_device *netdev,
  			    struct cfg80211_pmksa *pmksa)
  {
  	struct ath6kl *ar = ath6kl_priv(netdev);
  	struct ath6kl_vif *vif = netdev_priv(netdev);
  
  	return ath6kl_wmi_setpmkid_cmd(ar->wmi, vif->fw_vif_idx, pmksa->bssid,
  				       pmksa->pmkid, false);
  }
  
  static int ath6kl_flush_pmksa(struct wiphy *wiphy, struct net_device *netdev)
  {
  	struct ath6kl *ar = ath6kl_priv(netdev);
  	struct ath6kl_vif *vif = netdev_priv(netdev);
  
  	if (test_bit(CONNECTED, &vif->flags))
  		return ath6kl_wmi_setpmkid_cmd(ar->wmi, vif->fw_vif_idx,
  					       vif->bssid, NULL, false);
  	return 0;
  }
  
  static int ath6kl_wow_usr(struct ath6kl *ar, struct ath6kl_vif *vif,
  			  struct cfg80211_wowlan *wow, u32 *filter)
  {
  	int ret, pos;
  	u8 mask[WOW_PATTERN_SIZE];
  	u16 i;
  
  	/* Configure the patterns that we received from the user. */
  	for (i = 0; i < wow->n_patterns; i++) {
  		/*
  		 * Convert given nl80211 specific mask value to equivalent
  		 * driver specific mask value and send it to the chip along
  		 * with patterns. For example, If the mask value defined in
  		 * struct cfg80211_wowlan is 0xA (equivalent binary is 1010),
  		 * then equivalent driver specific mask value is
  		 * "0xFF 0x00 0xFF 0x00".
  		 */
  		memset(&mask, 0, sizeof(mask));
  		for (pos = 0; pos < wow->patterns[i].pattern_len; pos++) {
  			if (wow->patterns[i].mask[pos / 8] & (0x1 << (pos % 8)))
  				mask[pos] = 0xFF;
  		}
  		/*
  		 * Note: Pattern's offset is not passed as part of wowlan
  		 * parameter from CFG layer. So it's always passed as ZERO
  		 * to the firmware. It means, given WOW patterns are always
  		 * matched from the first byte of received pkt in the firmware.
  		 */
  		ret = ath6kl_wmi_add_wow_pattern_cmd(ar->wmi,
  				vif->fw_vif_idx, WOW_LIST_ID,
  				wow->patterns[i].pattern_len,
  				0 /* pattern offset */,
  				wow->patterns[i].pattern, mask);
  		if (ret)
  			return ret;
  	}
  
  	if (wow->disconnect)
  		*filter |= WOW_FILTER_OPTION_NWK_DISASSOC;
  
  	if (wow->magic_pkt)
  		*filter |= WOW_FILTER_OPTION_MAGIC_PACKET;
  
  	if (wow->gtk_rekey_failure)
  		*filter |= WOW_FILTER_OPTION_GTK_ERROR;
  
  	if (wow->eap_identity_req)
  		*filter |= WOW_FILTER_OPTION_EAP_REQ;
  
  	if (wow->four_way_handshake)
  		*filter |= WOW_FILTER_OPTION_8021X_4WAYHS;
  
  	return 0;
  }
  
  static int ath6kl_wow_ap(struct ath6kl *ar, struct ath6kl_vif *vif)
  {
  	static const u8 unicst_pattern[] = { 0x00, 0x00, 0x00,
  		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  		0x00, 0x08 };
  	static const u8 unicst_mask[] = { 0x01, 0x00, 0x00,
  		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  		0x00, 0x7f };
  	u8 unicst_offset = 0;
  	static const u8 arp_pattern[] = { 0x08, 0x06 };
  	static const u8 arp_mask[] = { 0xff, 0xff };
  	u8 arp_offset = 20;
  	static const u8 discvr_pattern[] = { 0xe0, 0x00, 0x00, 0xf8 };
  	static const u8 discvr_mask[] = { 0xf0, 0x00, 0x00, 0xf8 };
  	u8 discvr_offset = 38;
  	static const u8 dhcp_pattern[] = { 0xff, 0xff, 0xff, 0xff,
  		0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00,
  		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  		0x00, 0x00, 0x00, 0x00, 0x00, 0x43 /* port 67 */ };
  	static const u8 dhcp_mask[] = { 0xff, 0xff, 0xff, 0xff,
  		0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
  		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  		0x00, 0x00, 0x00, 0x00, 0xff, 0xff /* port 67 */ };
  	u8 dhcp_offset = 0;
  	int ret;
  
  	/* Setup unicast IP, EAPOL-like and ARP pkt pattern */
  	ret = ath6kl_wmi_add_wow_pattern_cmd(ar->wmi,
  			vif->fw_vif_idx, WOW_LIST_ID,
  			sizeof(unicst_pattern), unicst_offset,
  			unicst_pattern, unicst_mask);
  	if (ret) {
  		ath6kl_err("failed to add WOW unicast IP pattern
  ");
  		return ret;
  	}
  
  	/* Setup all ARP pkt pattern */
  	ret = ath6kl_wmi_add_wow_pattern_cmd(ar->wmi,
  			vif->fw_vif_idx, WOW_LIST_ID,
  			sizeof(arp_pattern), arp_offset,
  			arp_pattern, arp_mask);
  	if (ret) {
  		ath6kl_err("failed to add WOW ARP pattern
  ");
  		return ret;
  	}
  
  	/*
  	 * Setup multicast pattern for mDNS 224.0.0.251,
  	 * SSDP 239.255.255.250 and LLMNR  224.0.0.252
  	 */
  	ret = ath6kl_wmi_add_wow_pattern_cmd(ar->wmi,
  			vif->fw_vif_idx, WOW_LIST_ID,
  			sizeof(discvr_pattern), discvr_offset,
  			discvr_pattern, discvr_mask);
  	if (ret) {
  		ath6kl_err("failed to add WOW mDNS/SSDP/LLMNR pattern
  ");
  		return ret;
  	}
  
  	/* Setup all DHCP broadcast pkt pattern */
  	ret = ath6kl_wmi_add_wow_pattern_cmd(ar->wmi,
  			vif->fw_vif_idx, WOW_LIST_ID,
  			sizeof(dhcp_pattern), dhcp_offset,
  			dhcp_pattern, dhcp_mask);
  	if (ret) {
  		ath6kl_err("failed to add WOW DHCP broadcast pattern
  ");
  		return ret;
  	}
  
  	return 0;
  }
  
  static int ath6kl_wow_sta(struct ath6kl *ar, struct ath6kl_vif *vif)
  {
  	struct net_device *ndev = vif->ndev;
  	static const u8 discvr_pattern[] = { 0xe0, 0x00, 0x00, 0xf8 };
  	static const u8 discvr_mask[] = { 0xf0, 0x00, 0x00, 0xf8 };
  	u8 discvr_offset = 38;
  	u8 mac_mask[ETH_ALEN];
  	int ret;
  
  	/* Setup unicast pkt pattern */
  	eth_broadcast_addr(mac_mask);
  	ret = ath6kl_wmi_add_wow_pattern_cmd(ar->wmi,
  				vif->fw_vif_idx, WOW_LIST_ID,
  				ETH_ALEN, 0, ndev->dev_addr,
  				mac_mask);
  	if (ret) {
  		ath6kl_err("failed to add WOW unicast pattern
  ");
  		return ret;
  	}
  
  	/*
  	 * Setup multicast pattern for mDNS 224.0.0.251,
  	 * SSDP 239.255.255.250 and LLMNR 224.0.0.252
  	 */
  	if ((ndev->flags & IFF_ALLMULTI) ||
  	    (ndev->flags & IFF_MULTICAST && netdev_mc_count(ndev) > 0)) {
  		ret = ath6kl_wmi_add_wow_pattern_cmd(ar->wmi,
  				vif->fw_vif_idx, WOW_LIST_ID,
  				sizeof(discvr_pattern), discvr_offset,
  				discvr_pattern, discvr_mask);
  		if (ret) {
  			ath6kl_err("failed to add WOW mDNS/SSDP/LLMNR pattern
  ");
  			return ret;
  		}
  	}
  
  	return 0;
  }
  
  static int is_hsleep_mode_procsed(struct ath6kl_vif *vif)
  {
  	return test_bit(HOST_SLEEP_MODE_CMD_PROCESSED, &vif->flags);
  }
  
  static bool is_ctrl_ep_empty(struct ath6kl *ar)
  {
  	return !ar->tx_pending[ar->ctrl_ep];
  }
  
  static int ath6kl_cfg80211_host_sleep(struct ath6kl *ar, struct ath6kl_vif *vif)
  {
  	int ret, left;
  
  	clear_bit(HOST_SLEEP_MODE_CMD_PROCESSED, &vif->flags);
  
  	ret = ath6kl_wmi_set_host_sleep_mode_cmd(ar->wmi, vif->fw_vif_idx,
  						 ATH6KL_HOST_MODE_ASLEEP);
  	if (ret)
  		return ret;
  
  	left = wait_event_interruptible_timeout(ar->event_wq,
  						is_hsleep_mode_procsed(vif),
  						WMI_TIMEOUT);
  	if (left == 0) {
  		ath6kl_warn("timeout, didn't get host sleep cmd processed event
  ");
  		ret = -ETIMEDOUT;
  	} else if (left < 0) {
  		ath6kl_warn("error while waiting for host sleep cmd processed event %d
  ",
  			    left);
  		ret = left;
  	}
  
  	if (ar->tx_pending[ar->ctrl_ep]) {
  		left = wait_event_interruptible_timeout(ar->event_wq,
  							is_ctrl_ep_empty(ar),
  							WMI_TIMEOUT);
  		if (left == 0) {
  			ath6kl_warn("clear wmi ctrl data timeout
  ");
  			ret = -ETIMEDOUT;
  		} else if (left < 0) {
  			ath6kl_warn("clear wmi ctrl data failed: %d
  ", left);
  			ret = left;
  		}
  	}
  
  	return ret;
  }
  
  static int ath6kl_wow_suspend_vif(struct ath6kl_vif *vif,
  				  struct cfg80211_wowlan *wow, u32 *filter)
  {
  	struct ath6kl *ar = vif->ar;
  	struct in_device *in_dev;
  	struct in_ifaddr *ifa;
  	int ret;
  	u16 i, bmiss_time;
  	__be32 ips[MAX_IP_ADDRS];
  	u8 index = 0;
  
  	if (!test_bit(NETDEV_MCAST_ALL_ON, &vif->flags) &&
  	    test_bit(ATH6KL_FW_CAPABILITY_WOW_MULTICAST_FILTER,
  		     ar->fw_capabilities)) {
  		ret = ath6kl_wmi_mcast_filter_cmd(vif->ar->wmi,
  						vif->fw_vif_idx, false);
  		if (ret)
  			return ret;
  	}
  
  	/* Clear existing WOW patterns */
  	for (i = 0; i < WOW_MAX_FILTERS_PER_LIST; i++)
  		ath6kl_wmi_del_wow_pattern_cmd(ar->wmi, vif->fw_vif_idx,
  					       WOW_LIST_ID, i);
  
  	/*
  	 * Skip the default WOW pattern configuration
  	 * if the driver receives any WOW patterns from
  	 * the user.
  	 */
  	if (wow)
  		ret = ath6kl_wow_usr(ar, vif, wow, filter);
  	else if (vif->nw_type == AP_NETWORK)
  		ret = ath6kl_wow_ap(ar, vif);
  	else
  		ret = ath6kl_wow_sta(ar, vif);
  
  	if (ret)
  		return ret;
  
  	netif_stop_queue(vif->ndev);
  
  	if (vif->nw_type != AP_NETWORK) {
  		ret = ath6kl_wmi_listeninterval_cmd(ar->wmi, vif->fw_vif_idx,
  						    ATH6KL_MAX_WOW_LISTEN_INTL,
  						    0);
  		if (ret)
  			return ret;
  
  		/* Set listen interval x 15 times as bmiss time */
  		bmiss_time = ATH6KL_MAX_WOW_LISTEN_INTL * 15;
  		if (bmiss_time > ATH6KL_MAX_BMISS_TIME)
  			bmiss_time = ATH6KL_MAX_BMISS_TIME;
  
  		ret = ath6kl_wmi_bmisstime_cmd(ar->wmi, vif->fw_vif_idx,
  					       bmiss_time, 0);
  		if (ret)
  			return ret;
  
  		ret = ath6kl_wmi_scanparams_cmd(ar->wmi, vif->fw_vif_idx,
  						0xFFFF, 0, 0xFFFF, 0, 0, 0,
  						0, 0, 0, 0);
  		if (ret)
  			return ret;
  	}
  
  	/* Setup own IP addr for ARP agent. */
  	in_dev = __in_dev_get_rtnl(vif->ndev);
  	if (!in_dev)
  		return 0;
  
  	ifa = in_dev->ifa_list;
  	memset(&ips, 0, sizeof(ips));
  
  	/* Configure IP addr only if IP address count < MAX_IP_ADDRS */
  	while (index < MAX_IP_ADDRS && ifa) {
  		ips[index] = ifa->ifa_local;
  		ifa = ifa->ifa_next;
  		index++;
  	}
  
  	if (ifa) {
  		ath6kl_err("total IP addr count is exceeding fw limit
  ");
  		return -EINVAL;
  	}
  
  	ret = ath6kl_wmi_set_ip_cmd(ar->wmi, vif->fw_vif_idx, ips[0], ips[1]);
  	if (ret) {
  		ath6kl_err("fail to setup ip for arp agent
  ");
  		return ret;
  	}
  
  	return ret;
  }
  
  static int ath6kl_wow_suspend(struct ath6kl *ar, struct cfg80211_wowlan *wow)
  {
  	struct ath6kl_vif *first_vif, *vif;
  	int ret = 0;
  	u32 filter = 0;
  	bool connected = false;
  
  	/* enter / leave wow suspend on first vif always */
  	first_vif = ath6kl_vif_first(ar);
  	if (WARN_ON(!first_vif) ||
  	    !ath6kl_cfg80211_ready(first_vif))
  		return -EIO;
  
  	if (wow && (wow->n_patterns > WOW_MAX_FILTERS_PER_LIST))
  		return -EINVAL;
  
  	/* install filters for each connected vif */
  	spin_lock_bh(&ar->list_lock);
  	list_for_each_entry(vif, &ar->vif_list, list) {
  		if (!test_bit(CONNECTED, &vif->flags) ||
  		    !ath6kl_cfg80211_ready(vif))
  			continue;
  		connected = true;
  
  		ret = ath6kl_wow_suspend_vif(vif, wow, &filter);
  		if (ret)
  			break;
  	}
  	spin_unlock_bh(&ar->list_lock);
  
  	if (!connected)
  		return -ENOTCONN;
  	else if (ret)
  		return ret;
  
  	ar->state = ATH6KL_STATE_SUSPENDING;
  
  	ret = ath6kl_wmi_set_wow_mode_cmd(ar->wmi, first_vif->fw_vif_idx,
  					  ATH6KL_WOW_MODE_ENABLE,
  					  filter,
  					  WOW_HOST_REQ_DELAY);
  	if (ret)
  		return ret;
  
  	return ath6kl_cfg80211_host_sleep(ar, first_vif);
  }
  
  static int ath6kl_wow_resume_vif(struct ath6kl_vif *vif)
  {
  	struct ath6kl *ar = vif->ar;
  	int ret;
  
  	if (vif->nw_type != AP_NETWORK) {
  		ret = ath6kl_wmi_scanparams_cmd(ar->wmi, vif->fw_vif_idx,
  						0, 0, 0, 0, 0, 0, 3, 0, 0, 0);
  		if (ret)
  			return ret;
  
  		ret = ath6kl_wmi_listeninterval_cmd(ar->wmi, vif->fw_vif_idx,
  						    vif->listen_intvl_t, 0);
  		if (ret)
  			return ret;
  
  		ret = ath6kl_wmi_bmisstime_cmd(ar->wmi, vif->fw_vif_idx,
  					       vif->bmiss_time_t, 0);
  		if (ret)
  			return ret;
  	}
  
  	if (!test_bit(NETDEV_MCAST_ALL_OFF, &vif->flags) &&
  	    test_bit(ATH6KL_FW_CAPABILITY_WOW_MULTICAST_FILTER,
  		     ar->fw_capabilities)) {
  		ret = ath6kl_wmi_mcast_filter_cmd(vif->ar->wmi,
  						  vif->fw_vif_idx, true);
  		if (ret)
  			return ret;
  	}
  
  	netif_wake_queue(vif->ndev);
  
  	return 0;
  }
  
  static int ath6kl_wow_resume(struct ath6kl *ar)
  {
  	struct ath6kl_vif *vif;
  	int ret;
  
  	vif = ath6kl_vif_first(ar);
  	if (WARN_ON(!vif) ||
  	    !ath6kl_cfg80211_ready(vif))
  		return -EIO;
  
  	ar->state = ATH6KL_STATE_RESUMING;
  
  	ret = ath6kl_wmi_set_host_sleep_mode_cmd(ar->wmi, vif->fw_vif_idx,
  						 ATH6KL_HOST_MODE_AWAKE);
  	if (ret) {
  		ath6kl_warn("Failed to configure host sleep mode for wow resume: %d
  ",
  			    ret);
  		goto cleanup;
  	}
  
  	spin_lock_bh(&ar->list_lock);
  	list_for_each_entry(vif, &ar->vif_list, list) {
  		if (!test_bit(CONNECTED, &vif->flags) ||
  		    !ath6kl_cfg80211_ready(vif))
  			continue;
  		ret = ath6kl_wow_resume_vif(vif);
  		if (ret)
  			break;
  	}
  	spin_unlock_bh(&ar->list_lock);
  
  	if (ret)
  		goto cleanup;
  
  	ar->state = ATH6KL_STATE_ON;
  	return 0;
  
  cleanup:
  	ar->state = ATH6KL_STATE_WOW;
  	return ret;
  }
  
  static int ath6kl_cfg80211_deepsleep_suspend(struct ath6kl *ar)
  {
  	struct ath6kl_vif *vif;
  	int ret;
  
  	vif = ath6kl_vif_first(ar);
  	if (!vif)
  		return -EIO;
  
  	if (!test_bit(WMI_READY, &ar->flag)) {
  		ath6kl_err("deepsleep failed as wmi is not ready
  ");
  		return -EIO;
  	}
  
  	ath6kl_cfg80211_stop_all(ar);
  
  	/* Save the current power mode before enabling power save */
  	ar->wmi->saved_pwr_mode = ar->wmi->pwr_mode;
  
  	ret = ath6kl_wmi_powermode_cmd(ar->wmi, 0, REC_POWER);
  	if (ret)
  		return ret;
  
  	/* Disable WOW mode */
  	ret = ath6kl_wmi_set_wow_mode_cmd(ar->wmi, vif->fw_vif_idx,
  					  ATH6KL_WOW_MODE_DISABLE,
  					  0, 0);
  	if (ret)
  		return ret;
  
  	/* Flush all non control pkts in TX path */
  	ath6kl_tx_data_cleanup(ar);
  
  	ret = ath6kl_cfg80211_host_sleep(ar, vif);
  	if (ret)
  		return ret;
  
  	return 0;
  }
  
  static int ath6kl_cfg80211_deepsleep_resume(struct ath6kl *ar)
  {
  	struct ath6kl_vif *vif;
  	int ret;
  
  	vif = ath6kl_vif_first(ar);
  
  	if (!vif)
  		return -EIO;
  
  	if (ar->wmi->pwr_mode != ar->wmi->saved_pwr_mode) {
  		ret = ath6kl_wmi_powermode_cmd(ar->wmi, 0,
  					       ar->wmi->saved_pwr_mode);
  		if (ret)
  			return ret;
  	}
  
  	ret = ath6kl_wmi_set_host_sleep_mode_cmd(ar->wmi, vif->fw_vif_idx,
  						 ATH6KL_HOST_MODE_AWAKE);
  	if (ret)
  		return ret;
  
  	ar->state = ATH6KL_STATE_ON;
  
  	/* Reset scan parameter to default values */
  	ret = ath6kl_wmi_scanparams_cmd(ar->wmi, vif->fw_vif_idx,
  					0, 0, 0, 0, 0, 0, 3, 0, 0, 0);
  	if (ret)
  		return ret;
  
  	return 0;
  }
  
  int ath6kl_cfg80211_suspend(struct ath6kl *ar,
  			    enum ath6kl_cfg_suspend_mode mode,
  			    struct cfg80211_wowlan *wow)
  {
  	struct ath6kl_vif *vif;
  	enum ath6kl_state prev_state;
  	int ret;
  
  	switch (mode) {
  	case ATH6KL_CFG_SUSPEND_WOW:
  
  		ath6kl_dbg(ATH6KL_DBG_SUSPEND, "wow mode suspend
  ");
  
  		/* Flush all non control pkts in TX path */
  		ath6kl_tx_data_cleanup(ar);
  
  		prev_state = ar->state;
  
  		ret = ath6kl_wow_suspend(ar, wow);
  		if (ret) {
  			ar->state = prev_state;
  			return ret;
  		}
  
  		ar->state = ATH6KL_STATE_WOW;
  		break;
  
  	case ATH6KL_CFG_SUSPEND_DEEPSLEEP:
  
  		ath6kl_dbg(ATH6KL_DBG_SUSPEND, "deep sleep suspend
  ");
  
  		ret = ath6kl_cfg80211_deepsleep_suspend(ar);
  		if (ret) {
  			ath6kl_err("deepsleep suspend failed: %d
  ", ret);
  			return ret;
  		}
  
  		ar->state = ATH6KL_STATE_DEEPSLEEP;
  
  		break;
  
  	case ATH6KL_CFG_SUSPEND_CUTPOWER:
  
  		ath6kl_cfg80211_stop_all(ar);
  
  		if (ar->state == ATH6KL_STATE_OFF) {
  			ath6kl_dbg(ATH6KL_DBG_SUSPEND,
  				   "suspend hw off, no action for cutpower
  ");
  			break;
  		}
  
  		ath6kl_dbg(ATH6KL_DBG_SUSPEND, "suspend cutting power
  ");
  
  		ret = ath6kl_init_hw_stop(ar);
  		if (ret) {
  			ath6kl_warn("failed to stop hw during suspend: %d
  ",
  				    ret);
  		}
  
  		ar->state = ATH6KL_STATE_CUTPOWER;
  
  		break;
  
  	default:
  		break;
  	}
  
  	list_for_each_entry(vif, &ar->vif_list, list)
  		ath6kl_cfg80211_scan_complete_event(vif, true);
  
  	return 0;
  }
  EXPORT_SYMBOL(ath6kl_cfg80211_suspend);
  
  int ath6kl_cfg80211_resume(struct ath6kl *ar)
  {
  	int ret;
  
  	switch (ar->state) {
  	case  ATH6KL_STATE_WOW:
  		ath6kl_dbg(ATH6KL_DBG_SUSPEND, "wow mode resume
  ");
  
  		ret = ath6kl_wow_resume(ar);
  		if (ret) {
  			ath6kl_warn("wow mode resume failed: %d
  ", ret);
  			return ret;
  		}
  
  		break;
  
  	case ATH6KL_STATE_DEEPSLEEP:
  		ath6kl_dbg(ATH6KL_DBG_SUSPEND, "deep sleep resume
  ");
  
  		ret = ath6kl_cfg80211_deepsleep_resume(ar);
  		if (ret) {
  			ath6kl_warn("deep sleep resume failed: %d
  ", ret);
  			return ret;
  		}
  		break;
  
  	case ATH6KL_STATE_CUTPOWER:
  		ath6kl_dbg(ATH6KL_DBG_SUSPEND, "resume restoring power
  ");
  
  		ret = ath6kl_init_hw_start(ar);
  		if (ret) {
  			ath6kl_warn("Failed to boot hw in resume: %d
  ", ret);
  			return ret;
  		}
  		break;
  
  	default:
  		break;
  	}
  
  	return 0;
  }
  EXPORT_SYMBOL(ath6kl_cfg80211_resume);
  
  #ifdef CONFIG_PM
  
  /* hif layer decides what suspend mode to use */
  static int __ath6kl_cfg80211_suspend(struct wiphy *wiphy,
  				 struct cfg80211_wowlan *wow)
  {
  	struct ath6kl *ar = wiphy_priv(wiphy);
  
  	ath6kl_recovery_suspend(ar);
  
  	return ath6kl_hif_suspend(ar, wow);
  }
  
  static int __ath6kl_cfg80211_resume(struct wiphy *wiphy)
  {
  	struct ath6kl *ar = wiphy_priv(wiphy);
  	int err;
  
  	err = ath6kl_hif_resume(ar);
  	if (err)
  		return err;
  
  	ath6kl_recovery_resume(ar);
  
  	return 0;
  }
  
  /*
   * FIXME: WOW suspend mode is selected if the host sdio controller supports
   * both sdio irq wake up and keep power. The target pulls sdio data line to
   * wake up the host when WOW pattern matches. This causes sdio irq handler
   * is being called in the host side which internally hits ath6kl's RX path.
   *
   * Since sdio interrupt is not disabled, RX path executes even before
   * the host executes the actual resume operation from PM module.
   *
   * In the current scenario, WOW resume should happen before start processing
   * any data from the target. So It's required to perform WOW resume in RX path.
   * Ideally we should perform WOW resume only in the actual platform
   * resume path. This area needs bit rework to avoid WOW resume in RX path.
   *
   * ath6kl_check_wow_status() is called from ath6kl_rx().
   */
  void ath6kl_check_wow_status(struct ath6kl *ar)
  {
  	if (ar->state == ATH6KL_STATE_SUSPENDING)
  		return;
  
  	if (ar->state == ATH6KL_STATE_WOW)
  		ath6kl_cfg80211_resume(ar);
  }
  
  #else
  
  void ath6kl_check_wow_status(struct ath6kl *ar)
  {
  }
  #endif
  
  static int ath6kl_set_htcap(struct ath6kl_vif *vif, enum ieee80211_band band,
  			    bool ht_enable)
  {
  	struct ath6kl_htcap *htcap = &vif->htcap[band];
  
  	if (htcap->ht_enable == ht_enable)
  		return 0;
  
  	if (ht_enable) {
  		/* Set default ht capabilities */
  		htcap->ht_enable = true;
  		htcap->cap_info = (band == IEEE80211_BAND_2GHZ) ?
  				   ath6kl_g_htcap : ath6kl_a_htcap;
  		htcap->ampdu_factor = IEEE80211_HT_MAX_AMPDU_16K;
  	} else /* Disable ht */
  		memset(htcap, 0, sizeof(*htcap));
  
  	return ath6kl_wmi_set_htcap_cmd(vif->ar->wmi, vif->fw_vif_idx,
  					band, htcap);
  }
  
  static int ath6kl_restore_htcap(struct ath6kl_vif *vif)
  {
  	struct wiphy *wiphy = vif->ar->wiphy;
  	int band, ret = 0;
  
  	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  		if (!wiphy->bands[band])
  			continue;
  
  		ret = ath6kl_set_htcap(vif, band,
  				wiphy->bands[band]->ht_cap.ht_supported);
  		if (ret)
  			return ret;
  	}
  
  	return ret;
  }
  
  static bool ath6kl_is_p2p_ie(const u8 *pos)
  {
  	return pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
  		pos[2] == 0x50 && pos[3] == 0x6f &&
  		pos[4] == 0x9a && pos[5] == 0x09;
  }
  
  static int ath6kl_set_ap_probe_resp_ies(struct ath6kl_vif *vif,
  					const u8 *ies, size_t ies_len)
  {
  	struct ath6kl *ar = vif->ar;
  	const u8 *pos;
  	u8 *buf = NULL;
  	size_t len = 0;
  	int ret;
  
  	/*
  	 * Filter out P2P IE(s) since they will be included depending on
  	 * the Probe Request frame in ath6kl_send_go_probe_resp().
  	 */
  
  	if (ies && ies_len) {
  		buf = kmalloc(ies_len, GFP_KERNEL);
  		if (buf == NULL)
  			return -ENOMEM;
  		pos = ies;
  		while (pos + 1 < ies + ies_len) {
  			if (pos + 2 + pos[1] > ies + ies_len)
  				break;
  			if (!ath6kl_is_p2p_ie(pos)) {
  				memcpy(buf + len, pos, 2 + pos[1]);
  				len += 2 + pos[1];
  			}
  			pos += 2 + pos[1];
  		}
  	}
  
  	ret = ath6kl_wmi_set_appie_cmd(ar->wmi, vif->fw_vif_idx,
  				       WMI_FRAME_PROBE_RESP, buf, len);
  	kfree(buf);
  	return ret;
  }
  
  static int ath6kl_set_ies(struct ath6kl_vif *vif,
  			  struct cfg80211_beacon_data *info)
  {
  	struct ath6kl *ar = vif->ar;
  	int res;
  
  	/* this also clears IE in fw if it's not set */
  	res = ath6kl_wmi_set_appie_cmd(ar->wmi, vif->fw_vif_idx,
  				       WMI_FRAME_BEACON,
  				       info->beacon_ies,
  				       info->beacon_ies_len);
  	if (res)
  		return res;
  
  	/* this also clears IE in fw if it's not set */
  	res = ath6kl_set_ap_probe_resp_ies(vif, info->proberesp_ies,
  					   info->proberesp_ies_len);
  	if (res)
  		return res;
  
  	/* this also clears IE in fw if it's not set */
  	res = ath6kl_wmi_set_appie_cmd(ar->wmi, vif->fw_vif_idx,
  				       WMI_FRAME_ASSOC_RESP,
  				       info->assocresp_ies,
  				       info->assocresp_ies_len);
  	if (res)
  		return res;
  
  	return 0;
  }
  
  static int ath6kl_get_rsn_capab(struct cfg80211_beacon_data *beacon,
  				u8 *rsn_capab)
  {
  	const u8 *rsn_ie;
  	size_t rsn_ie_len;
  	u16 cnt;
  
  	if (!beacon->tail)
  		return -EINVAL;
  
  	rsn_ie = cfg80211_find_ie(WLAN_EID_RSN, beacon->tail, beacon->tail_len);
  	if (!rsn_ie)
  		return -EINVAL;
  
  	rsn_ie_len = *(rsn_ie + 1);
  	/* skip element id and length */
  	rsn_ie += 2;
  
  	/* skip version */
  	if (rsn_ie_len < 2)
  		return -EINVAL;
  	rsn_ie +=  2;
  	rsn_ie_len -= 2;
  
  	/* skip group cipher suite */
  	if (rsn_ie_len < 4)
  		return 0;
  	rsn_ie +=  4;
  	rsn_ie_len -= 4;
  
  	/* skip pairwise cipher suite */
  	if (rsn_ie_len < 2)
  		return 0;
  	cnt = get_unaligned_le16(rsn_ie);
  	rsn_ie += (2 + cnt * 4);
  	rsn_ie_len -= (2 + cnt * 4);
  
  	/* skip akm suite */
  	if (rsn_ie_len < 2)
  		return 0;
  	cnt = get_unaligned_le16(rsn_ie);
  	rsn_ie += (2 + cnt * 4);
  	rsn_ie_len -= (2 + cnt * 4);
  
  	if (rsn_ie_len < 2)
  		return 0;
  
  	memcpy(rsn_capab, rsn_ie, 2);
  
  	return 0;
  }
  
  static int ath6kl_start_ap(struct wiphy *wiphy, struct net_device *dev,
  			   struct cfg80211_ap_settings *info)
  {
  	struct ath6kl *ar = ath6kl_priv(dev);
  	struct ath6kl_vif *vif = netdev_priv(dev);
  	struct ieee80211_mgmt *mgmt;
  	bool hidden = false;
  	u8 *ies;
  	int ies_len;
  	struct wmi_connect_cmd p;
  	int res;
  	int i, ret;
  	u16 rsn_capab = 0;
  	int inactivity_timeout = 0;
  
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s:
  ", __func__);
  
  	if (!ath6kl_cfg80211_ready(vif))
  		return -EIO;
  
  	if (vif->next_mode != AP_NETWORK)
  		return -EOPNOTSUPP;
  
  	res = ath6kl_set_ies(vif, &info->beacon);
  
  	ar->ap_mode_bkey.valid = false;
  
  	ret = ath6kl_wmi_ap_set_beacon_intvl_cmd(ar->wmi, vif->fw_vif_idx,
  						 info->beacon_interval);
  
  	if (ret)
  		ath6kl_warn("Failed to set beacon interval: %d
  ", ret);
  
  	ret = ath6kl_wmi_ap_set_dtim_cmd(ar->wmi, vif->fw_vif_idx,
  					 info->dtim_period);
  
  	/* ignore error, just print a warning and continue normally */
  	if (ret)
  		ath6kl_warn("Failed to set dtim_period in beacon: %d
  ", ret);
  
  	if (info->beacon.head == NULL)
  		return -EINVAL;
  	mgmt = (struct ieee80211_mgmt *) info->beacon.head;
  	ies = mgmt->u.beacon.variable;
  	if (ies > info->beacon.head + info->beacon.head_len)
  		return -EINVAL;
  	ies_len = info->beacon.head + info->beacon.head_len - ies;
  
  	if (info->ssid == NULL)
  		return -EINVAL;
  	memcpy(vif->ssid, info->ssid, info->ssid_len);
  	vif->ssid_len = info->ssid_len;
  	if (info->hidden_ssid != NL80211_HIDDEN_SSID_NOT_IN_USE)
  		hidden = true;
  
  	res = ath6kl_wmi_ap_hidden_ssid(ar->wmi, vif->fw_vif_idx, hidden);
  	if (res)
  		return res;
  
  	ret = ath6kl_set_auth_type(vif, info->auth_type);
  	if (ret)
  		return ret;
  
  	memset(&p, 0, sizeof(p));
  
  	for (i = 0; i < info->crypto.n_akm_suites; i++) {
  		switch (info->crypto.akm_suites[i]) {
  		case WLAN_AKM_SUITE_8021X:
  			if (info->crypto.wpa_versions & NL80211_WPA_VERSION_1)
  				p.auth_mode |= WPA_AUTH;
  			if (info->crypto.wpa_versions & NL80211_WPA_VERSION_2)
  				p.auth_mode |= WPA2_AUTH;
  			break;
  		case WLAN_AKM_SUITE_PSK:
  			if (info->crypto.wpa_versions & NL80211_WPA_VERSION_1)
  				p.auth_mode |= WPA_PSK_AUTH;
  			if (info->crypto.wpa_versions & NL80211_WPA_VERSION_2)
  				p.auth_mode |= WPA2_PSK_AUTH;
  			break;
  		}
  	}
  	if (p.auth_mode == 0)
  		p.auth_mode = NONE_AUTH;
  	vif->auth_mode = p.auth_mode;
  
  	for (i = 0; i < info->crypto.n_ciphers_pairwise; i++) {
  		switch (info->crypto.ciphers_pairwise[i]) {
  		case WLAN_CIPHER_SUITE_WEP40:
  		case WLAN_CIPHER_SUITE_WEP104:
  			p.prwise_crypto_type |= WEP_CRYPT;
  			break;
  		case WLAN_CIPHER_SUITE_TKIP:
  			p.prwise_crypto_type |= TKIP_CRYPT;
  			break;
  		case WLAN_CIPHER_SUITE_CCMP:
  			p.prwise_crypto_type |= AES_CRYPT;
  			break;
  		case WLAN_CIPHER_SUITE_SMS4:
  			p.prwise_crypto_type |= WAPI_CRYPT;
  			break;
  		}
  	}
  	if (p.prwise_crypto_type == 0) {
  		p.prwise_crypto_type = NONE_CRYPT;
  		ath6kl_set_cipher(vif, 0, true);
  	} else if (info->crypto.n_ciphers_pairwise == 1) {
  		ath6kl_set_cipher(vif, info->crypto.ciphers_pairwise[0], true);
  	}
  
  	switch (info->crypto.cipher_group) {
  	case WLAN_CIPHER_SUITE_WEP40:
  	case WLAN_CIPHER_SUITE_WEP104:
  		p.grp_crypto_type = WEP_CRYPT;
  		break;
  	case WLAN_CIPHER_SUITE_TKIP:
  		p.grp_crypto_type = TKIP_CRYPT;
  		break;
  	case WLAN_CIPHER_SUITE_CCMP:
  		p.grp_crypto_type = AES_CRYPT;
  		break;
  	case WLAN_CIPHER_SUITE_SMS4:
  		p.grp_crypto_type = WAPI_CRYPT;
  		break;
  	default:
  		p.grp_crypto_type = NONE_CRYPT;
  		break;
  	}
  	ath6kl_set_cipher(vif, info->crypto.cipher_group, false);
  
  	p.nw_type = AP_NETWORK;
  	vif->nw_type = vif->next_mode;
  
  	p.ssid_len = vif->ssid_len;
  	memcpy(p.ssid, vif->ssid, vif->ssid_len);
  	p.dot11_auth_mode = vif->dot11_auth_mode;
  	p.ch = cpu_to_le16(info->chandef.chan->center_freq);
  
  	/* Enable uAPSD support by default */
  	res = ath6kl_wmi_ap_set_apsd(ar->wmi, vif->fw_vif_idx, true);
  	if (res < 0)
  		return res;
  
  	if (vif->wdev.iftype == NL80211_IFTYPE_P2P_GO) {
  		p.nw_subtype = SUBTYPE_P2PGO;
  	} else {
  		/*
  		 * Due to firmware limitation, it is not possible to
  		 * do P2P mgmt operations in AP mode
  		 */
  		p.nw_subtype = SUBTYPE_NONE;
  	}
  
  	if (info->inactivity_timeout) {
  		inactivity_timeout = info->inactivity_timeout;
  
  		if (test_bit(ATH6KL_FW_CAPABILITY_AP_INACTIVITY_MINS,
  			     ar->fw_capabilities))
  			inactivity_timeout = DIV_ROUND_UP(inactivity_timeout,
  							  60);
  
  		res = ath6kl_wmi_set_inact_period(ar->wmi, vif->fw_vif_idx,
  						  inactivity_timeout);
  		if (res < 0)
  			return res;
  	}
  
  	if (ath6kl_set_htcap(vif, info->chandef.chan->band,
  			     cfg80211_get_chandef_type(&info->chandef)
  					!= NL80211_CHAN_NO_HT))
  		return -EIO;
  
  	/*
  	 * Get the PTKSA replay counter in the RSN IE. Supplicant
  	 * will use the RSN IE in M3 message and firmware has to
  	 * advertise the same in beacon/probe response. Send
  	 * the complete RSN IE capability field to firmware
  	 */
  	if (!ath6kl_get_rsn_capab(&info->beacon, (u8 *) &rsn_capab) &&
  	    test_bit(ATH6KL_FW_CAPABILITY_RSN_CAP_OVERRIDE,
  		     ar->fw_capabilities)) {
  		res = ath6kl_wmi_set_ie_cmd(ar->wmi, vif->fw_vif_idx,
  					    WLAN_EID_RSN, WMI_RSN_IE_CAPB,
  					    (const u8 *) &rsn_capab,
  					    sizeof(rsn_capab));
  		vif->rsn_capab = rsn_capab;
  		if (res < 0)
  			return res;
  	}
  
  	memcpy(&vif->profile, &p, sizeof(p));
  	res = ath6kl_wmi_ap_profile_commit(ar->wmi, vif->fw_vif_idx, &p);
  	if (res < 0)
  		return res;
  
  	return 0;
  }
  
  static int ath6kl_change_beacon(struct wiphy *wiphy, struct net_device *dev,
  				struct cfg80211_beacon_data *beacon)
  {
  	struct ath6kl_vif *vif = netdev_priv(dev);
  
  	if (!ath6kl_cfg80211_ready(vif))
  		return -EIO;
  
  	if (vif->next_mode != AP_NETWORK)
  		return -EOPNOTSUPP;
  
  	return ath6kl_set_ies(vif, beacon);
  }
  
  static int ath6kl_stop_ap(struct wiphy *wiphy, struct net_device *dev)
  {
  	struct ath6kl *ar = ath6kl_priv(dev);
  	struct ath6kl_vif *vif = netdev_priv(dev);
  
  	if (vif->nw_type != AP_NETWORK)
  		return -EOPNOTSUPP;
  	if (!test_bit(CONNECTED, &vif->flags))
  		return -ENOTCONN;
  
  	ath6kl_wmi_disconnect_cmd(ar->wmi, vif->fw_vif_idx);
  	clear_bit(CONNECTED, &vif->flags);
  
  	/* Restore ht setting in firmware */
  	return ath6kl_restore_htcap(vif);
  }
  
  static const u8 bcast_addr[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
  
  static int ath6kl_del_station(struct wiphy *wiphy, struct net_device *dev,
  			      struct station_del_parameters *params)
  {
  	struct ath6kl *ar = ath6kl_priv(dev);
  	struct ath6kl_vif *vif = netdev_priv(dev);
  	const u8 *addr = params->mac ? params->mac : bcast_addr;
  
  	return ath6kl_wmi_ap_set_mlme(ar->wmi, vif->fw_vif_idx, WMI_AP_DEAUTH,
  				      addr, WLAN_REASON_PREV_AUTH_NOT_VALID);
  }
  
  static int ath6kl_change_station(struct wiphy *wiphy, struct net_device *dev,
  				 const u8 *mac,
  				 struct station_parameters *params)
  {
  	struct ath6kl *ar = ath6kl_priv(dev);
  	struct ath6kl_vif *vif = netdev_priv(dev);
  	int err;
  
  	if (vif->nw_type != AP_NETWORK)
  		return -EOPNOTSUPP;
  
  	err = cfg80211_check_station_change(wiphy, params,
  					    CFG80211_STA_AP_MLME_CLIENT);
  	if (err)
  		return err;
  
  	if (params->sta_flags_set & BIT(NL80211_STA_FLAG_AUTHORIZED))
  		return ath6kl_wmi_ap_set_mlme(ar->wmi, vif->fw_vif_idx,
  					      WMI_AP_MLME_AUTHORIZE, mac, 0);
  	return ath6kl_wmi_ap_set_mlme(ar->wmi, vif->fw_vif_idx,
  				      WMI_AP_MLME_UNAUTHORIZE, mac, 0);
  }
  
  static int ath6kl_remain_on_channel(struct wiphy *wiphy,
  				    struct wireless_dev *wdev,
  				    struct ieee80211_channel *chan,
  				    unsigned int duration,
  				    u64 *cookie)
  {
  	struct ath6kl_vif *vif = ath6kl_vif_from_wdev(wdev);
  	struct ath6kl *ar = ath6kl_priv(vif->ndev);
  	u32 id;
  
  	/* TODO: if already pending or ongoing remain-on-channel,
  	 * return -EBUSY */
  	id = ++vif->last_roc_id;
  	if (id == 0) {
  		/* Do not use 0 as the cookie value */
  		id = ++vif->last_roc_id;
  	}
  	*cookie = id;
  
  	return ath6kl_wmi_remain_on_chnl_cmd(ar->wmi, vif->fw_vif_idx,
  					     chan->center_freq, duration);
  }
  
  static int ath6kl_cancel_remain_on_channel(struct wiphy *wiphy,
  					   struct wireless_dev *wdev,
  					   u64 cookie)
  {
  	struct ath6kl_vif *vif = ath6kl_vif_from_wdev(wdev);
  	struct ath6kl *ar = ath6kl_priv(vif->ndev);
  
  	if (cookie != vif->last_roc_id)
  		return -ENOENT;
  	vif->last_cancel_roc_id = cookie;
  
  	return ath6kl_wmi_cancel_remain_on_chnl_cmd(ar->wmi, vif->fw_vif_idx);
  }
  
  static int ath6kl_send_go_probe_resp(struct ath6kl_vif *vif,
  				     const u8 *buf, size_t len,
  				     unsigned int freq)
  {
  	struct ath6kl *ar = vif->ar;
  	const u8 *pos;
  	u8 *p2p;
  	int p2p_len;
  	int ret;
  	const struct ieee80211_mgmt *mgmt;
  
  	mgmt = (const struct ieee80211_mgmt *) buf;
  
  	/* Include P2P IE(s) from the frame generated in user space. */
  
  	p2p = kmalloc(len, GFP_KERNEL);
  	if (p2p == NULL)
  		return -ENOMEM;
  	p2p_len = 0;
  
  	pos = mgmt->u.probe_resp.variable;
  	while (pos + 1 < buf + len) {
  		if (pos + 2 + pos[1] > buf + len)
  			break;
  		if (ath6kl_is_p2p_ie(pos)) {
  			memcpy(p2p + p2p_len, pos, 2 + pos[1]);
  			p2p_len += 2 + pos[1];
  		}
  		pos += 2 + pos[1];
  	}
  
  	ret = ath6kl_wmi_send_probe_response_cmd(ar->wmi, vif->fw_vif_idx, freq,
  						 mgmt->da, p2p, p2p_len);
  	kfree(p2p);
  	return ret;
  }
  
  static bool ath6kl_mgmt_powersave_ap(struct ath6kl_vif *vif,
  				     u32 id,
  				     u32 freq,
  				     u32 wait,
  				     const u8 *buf,
  				     size_t len,
  				     bool *more_data,
  				     bool no_cck)
  {
  	struct ieee80211_mgmt *mgmt;
  	struct ath6kl_sta *conn;
  	bool is_psq_empty = false;
  	struct ath6kl_mgmt_buff *mgmt_buf;
  	size_t mgmt_buf_size;
  	struct ath6kl *ar = vif->ar;
  
  	mgmt = (struct ieee80211_mgmt *) buf;
  	if (is_multicast_ether_addr(mgmt->da))
  		return false;
  
  	conn = ath6kl_find_sta(vif, mgmt->da);
  	if (!conn)
  		return false;
  
  	if (conn->sta_flags & STA_PS_SLEEP) {
  		if (!(conn->sta_flags & STA_PS_POLLED)) {
  			/* Queue the frames if the STA is sleeping */
  			mgmt_buf_size = len + sizeof(struct ath6kl_mgmt_buff);
  			mgmt_buf = kmalloc(mgmt_buf_size, GFP_KERNEL);
  			if (!mgmt_buf)
  				return false;
  
  			INIT_LIST_HEAD(&mgmt_buf->list);
  			mgmt_buf->id = id;
  			mgmt_buf->freq = freq;
  			mgmt_buf->wait = wait;
  			mgmt_buf->len = len;
  			mgmt_buf->no_cck = no_cck;
  			memcpy(mgmt_buf->buf, buf, len);
  			spin_lock_bh(&conn->psq_lock);
  			is_psq_empty = skb_queue_empty(&conn->psq) &&
  					(conn->mgmt_psq_len == 0);
  			list_add_tail(&mgmt_buf->list, &conn->mgmt_psq);
  			conn->mgmt_psq_len++;
  			spin_unlock_bh(&conn->psq_lock);
  
  			/*
  			 * If this is the first pkt getting queued
  			 * for this STA, update the PVB for this
  			 * STA.
  			 */
  			if (is_psq_empty)
  				ath6kl_wmi_set_pvb_cmd(ar->wmi, vif->fw_vif_idx,
  						       conn->aid, 1);
  			return true;
  		}
  
  		/*
  		 * This tx is because of a PsPoll.
  		 * Determine if MoreData bit has to be set.
  		 */
  		spin_lock_bh(&conn->psq_lock);
  		if (!skb_queue_empty(&conn->psq) || (conn->mgmt_psq_len != 0))
  			*more_data = true;
  		spin_unlock_bh(&conn->psq_lock);
  	}
  
  	return false;
  }
  
  /* Check if SSID length is greater than DIRECT- */
  static bool ath6kl_is_p2p_go_ssid(const u8 *buf, size_t len)
  {
  	const struct ieee80211_mgmt *mgmt;
  	mgmt = (const struct ieee80211_mgmt *) buf;
  
  	/* variable[1] contains the SSID tag length */
  	if (buf + len >= &mgmt->u.probe_resp.variable[1] &&
  	    (mgmt->u.probe_resp.variable[1] > P2P_WILDCARD_SSID_LEN)) {
  		return true;
  	}
  
  	return false;
  }
  
  static int ath6kl_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
  			  struct cfg80211_mgmt_tx_params *params, u64 *cookie)
  {
  	struct ath6kl_vif *vif = ath6kl_vif_from_wdev(wdev);
  	struct ath6kl *ar = ath6kl_priv(vif->ndev);
  	struct ieee80211_channel *chan = params->chan;
  	const u8 *buf = params->buf;
  	size_t len = params->len;
  	unsigned int wait = params->wait;
  	bool no_cck = params->no_cck;
  	u32 id, freq;
  	const struct ieee80211_mgmt *mgmt;
  	bool more_data, queued;
  
  	/* default to the current channel, but use the one specified as argument
  	 * if any
  	 */
  	freq = vif->ch_hint;
  	if (chan)
  		freq = chan->center_freq;
  
  	/* never send freq zero to the firmware */
  	if (WARN_ON(freq == 0))
  		return -EINVAL;
  
  	mgmt = (const struct ieee80211_mgmt *) buf;
  	if (vif->nw_type == AP_NETWORK && test_bit(CONNECTED, &vif->flags) &&
  	    ieee80211_is_probe_resp(mgmt->frame_control) &&
  	    ath6kl_is_p2p_go_ssid(buf, len)) {
  		/*
  		 * Send Probe Response frame in GO mode using a separate WMI
  		 * command to allow the target to fill in the generic IEs.
  		 */
  		*cookie = 0; /* TX status not supported */
  		return ath6kl_send_go_probe_resp(vif, buf, len, freq);
  	}
  
  	id = vif->send_action_id++;
  	if (id == 0) {
  		/*
  		 * 0 is a reserved value in the WMI command and shall not be
  		 * used for the command.
  		 */
  		id = vif->send_action_id++;
  	}
  
  	*cookie = id;
  
  	/* AP mode Power saving processing */
  	if (vif->nw_type == AP_NETWORK) {
  		queued = ath6kl_mgmt_powersave_ap(vif, id, freq, wait, buf, len,
  						  &more_data, no_cck);
  		if (queued)
  			return 0;
  	}
  
  	return ath6kl_wmi_send_mgmt_cmd(ar->wmi, vif->fw_vif_idx, id, freq,
  					wait, buf, len, no_cck);
  }
  
  static int ath6kl_get_antenna(struct wiphy *wiphy,
  			      u32 *tx_ant, u32 *rx_ant)
  {
  	struct ath6kl *ar = wiphy_priv(wiphy);
  	*tx_ant = ar->hw.tx_ant;
  	*rx_ant = ar->hw.rx_ant;
  	return 0;
  }
  
  static void ath6kl_mgmt_frame_register(struct wiphy *wiphy,
  				       struct wireless_dev *wdev,
  				       u16 frame_type, bool reg)
  {
  	struct ath6kl_vif *vif = ath6kl_vif_from_wdev(wdev);
  
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: frame_type=0x%x reg=%d
  ",
  		   __func__, frame_type, reg);
  	if (frame_type == IEEE80211_STYPE_PROBE_REQ) {
  		/*
  		 * Note: This notification callback is not allowed to sleep, so
  		 * we cannot send WMI_PROBE_REQ_REPORT_CMD here. Instead, we
  		 * hardcode target to report Probe Request frames all the time.
  		 */
  		vif->probe_req_report = reg;
  	}
  }
  
  static int ath6kl_cfg80211_sscan_start(struct wiphy *wiphy,
  			struct net_device *dev,
  			struct cfg80211_sched_scan_request *request)
  {
  	struct ath6kl *ar = ath6kl_priv(dev);
  	struct ath6kl_vif *vif = netdev_priv(dev);
  	u16 interval;
  	int ret, rssi_thold;
  	int n_match_sets = request->n_match_sets;
  
  	/*
  	 * If there's a matchset w/o an SSID, then assume it's just for
  	 * the RSSI (nothing else is currently supported) and ignore it.
  	 * The device only supports a global RSSI filter that we set below.
  	 */
  	if (n_match_sets == 1 && !request->match_sets[0].ssid.ssid_len)
  		n_match_sets = 0;
  
  	if (ar->state != ATH6KL_STATE_ON)
  		return -EIO;
  
  	if (vif->sme_state != SME_DISCONNECTED)
  		return -EBUSY;
  
  	ath6kl_cfg80211_scan_complete_event(vif, true);
  
  	ret = ath6kl_set_probed_ssids(ar, vif, request->ssids,
  				      request->n_ssids,
  				      request->match_sets,
  				      n_match_sets);
  	if (ret < 0)
  		return ret;
  
  	if (!n_match_sets) {
  		ret = ath6kl_wmi_bssfilter_cmd(ar->wmi, vif->fw_vif_idx,
  					       ALL_BSS_FILTER, 0);
  		if (ret < 0)
  			return ret;
  	} else {
  		 ret = ath6kl_wmi_bssfilter_cmd(ar->wmi, vif->fw_vif_idx,
  						MATCHED_SSID_FILTER, 0);
  		if (ret < 0)
  			return ret;
  	}
  
  	if (test_bit(ATH6KL_FW_CAPABILITY_RSSI_SCAN_THOLD,
  		     ar->fw_capabilities)) {
  		if (request->min_rssi_thold <= NL80211_SCAN_RSSI_THOLD_OFF)
  			rssi_thold = 0;
  		else if (request->min_rssi_thold < -127)
  			rssi_thold = -127;
  		else
  			rssi_thold = request->min_rssi_thold;
  
  		ret = ath6kl_wmi_set_rssi_filter_cmd(ar->wmi, vif->fw_vif_idx,
  						     rssi_thold);
  		if (ret) {
  			ath6kl_err("failed to set RSSI threshold for scan
  ");
  			return ret;
  		}
  	}
  
  	/* fw uses seconds, also make sure that it's >0 */
  	interval = max_t(u16, 1, request->scan_plans[0].interval);
  
  	ath6kl_wmi_scanparams_cmd(ar->wmi, vif->fw_vif_idx,
  				  interval, interval,
  				  vif->bg_scan_period, 0, 0, 0, 3, 0, 0, 0);
  
  	/* this also clears IE in fw if it's not set */
  	ret = ath6kl_wmi_set_appie_cmd(ar->wmi, vif->fw_vif_idx,
  				       WMI_FRAME_PROBE_REQ,
  				       request->ie, request->ie_len);
  	if (ret) {
  		ath6kl_warn("Failed to set probe request IE for scheduled scan: %d
  ",
  			    ret);
  		return ret;
  	}
  
  	ret = ath6kl_wmi_enable_sched_scan_cmd(ar->wmi, vif->fw_vif_idx, true);
  	if (ret)
  		return ret;
  
  	set_bit(SCHED_SCANNING, &vif->flags);
  
  	return 0;
  }
  
  static int ath6kl_cfg80211_sscan_stop(struct wiphy *wiphy,
  				      struct net_device *dev)
  {
  	struct ath6kl_vif *vif = netdev_priv(dev);
  	bool stopped;
  
  	stopped = __ath6kl_cfg80211_sscan_stop(vif);
  
  	if (!stopped)
  		return -EIO;
  
  	return 0;
  }
  
  static int ath6kl_cfg80211_set_bitrate(struct wiphy *wiphy,
  				       struct net_device *dev,
  				       const u8 *addr,
  				       const struct cfg80211_bitrate_mask *mask)
  {
  	struct ath6kl *ar = ath6kl_priv(dev);
  	struct ath6kl_vif *vif = netdev_priv(dev);
  
  	return ath6kl_wmi_set_bitrate_mask(ar->wmi, vif->fw_vif_idx,
  					   mask);
  }
  
  static int ath6kl_cfg80211_set_txe_config(struct wiphy *wiphy,
  					  struct net_device *dev,
  					  u32 rate, u32 pkts, u32 intvl)
  {
  	struct ath6kl *ar = ath6kl_priv(dev);
  	struct ath6kl_vif *vif = netdev_priv(dev);
  
  	if (vif->nw_type != INFRA_NETWORK ||
  	    !test_bit(ATH6KL_FW_CAPABILITY_TX_ERR_NOTIFY, ar->fw_capabilities))
  		return -EOPNOTSUPP;
  
  	if (vif->sme_state != SME_CONNECTED)
  		return -ENOTCONN;
  
  	/* save this since the firmware won't report the interval */
  	vif->txe_intvl = intvl;
  
  	return ath6kl_wmi_set_txe_notify(ar->wmi, vif->fw_vif_idx,
  					 rate, pkts, intvl);
  }
  
  static const struct ieee80211_txrx_stypes
  ath6kl_mgmt_stypes[NUM_NL80211_IFTYPES] = {
  	[NL80211_IFTYPE_STATION] = {
  		.tx = BIT(IEEE80211_STYPE_ACTION >> 4) |
  		BIT(IEEE80211_STYPE_PROBE_RESP >> 4),
  		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
  		BIT(IEEE80211_STYPE_PROBE_REQ >> 4)
  	},
  	[NL80211_IFTYPE_AP] = {
  		.tx = BIT(IEEE80211_STYPE_ACTION >> 4) |
  		BIT(IEEE80211_STYPE_PROBE_RESP >> 4),
  		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
  		BIT(IEEE80211_STYPE_PROBE_REQ >> 4)
  	},
  	[NL80211_IFTYPE_P2P_CLIENT] = {
  		.tx = BIT(IEEE80211_STYPE_ACTION >> 4) |
  		BIT(IEEE80211_STYPE_PROBE_RESP >> 4),
  		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
  		BIT(IEEE80211_STYPE_PROBE_REQ >> 4)
  	},
  	[NL80211_IFTYPE_P2P_GO] = {
  		.tx = BIT(IEEE80211_STYPE_ACTION >> 4) |
  		BIT(IEEE80211_STYPE_PROBE_RESP >> 4),
  		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
  		BIT(IEEE80211_STYPE_PROBE_REQ >> 4)
  	},
  };
  
  static struct cfg80211_ops ath6kl_cfg80211_ops = {
  	.add_virtual_intf = ath6kl_cfg80211_add_iface,
  	.del_virtual_intf = ath6kl_cfg80211_del_iface,
  	.change_virtual_intf = ath6kl_cfg80211_change_iface,
  	.scan = ath6kl_cfg80211_scan,
  	.connect = ath6kl_cfg80211_connect,
  	.disconnect = ath6kl_cfg80211_disconnect,
  	.add_key = ath6kl_cfg80211_add_key,
  	.get_key = ath6kl_cfg80211_get_key,
  	.del_key = ath6kl_cfg80211_del_key,
  	.set_default_key = ath6kl_cfg80211_set_default_key,
  	.set_wiphy_params = ath6kl_cfg80211_set_wiphy_params,
  	.set_tx_power = ath6kl_cfg80211_set_txpower,
  	.get_tx_power = ath6kl_cfg80211_get_txpower,
  	.set_power_mgmt = ath6kl_cfg80211_set_power_mgmt,
  	.join_ibss = ath6kl_cfg80211_join_ibss,
  	.leave_ibss = ath6kl_cfg80211_leave_ibss,
  	.get_station = ath6kl_get_station,
  	.set_pmksa = ath6kl_set_pmksa,
  	.del_pmksa = ath6kl_del_pmksa,
  	.flush_pmksa = ath6kl_flush_pmksa,
  	CFG80211_TESTMODE_CMD(ath6kl_tm_cmd)
  #ifdef CONFIG_PM
  	.suspend = __ath6kl_cfg80211_suspend,
  	.resume = __ath6kl_cfg80211_resume,
  #endif
  	.start_ap = ath6kl_start_ap,
  	.change_beacon = ath6kl_change_beacon,
  	.stop_ap = ath6kl_stop_ap,
  	.del_station = ath6kl_del_station,
  	.change_station = ath6kl_change_station,
  	.remain_on_channel = ath6kl_remain_on_channel,
  	.cancel_remain_on_channel = ath6kl_cancel_remain_on_channel,
  	.mgmt_tx = ath6kl_mgmt_tx,
  	.mgmt_frame_register = ath6kl_mgmt_frame_register,
  	.get_antenna = ath6kl_get_antenna,
  	.sched_scan_start = ath6kl_cfg80211_sscan_start,
  	.sched_scan_stop = ath6kl_cfg80211_sscan_stop,
  	.set_bitrate_mask = ath6kl_cfg80211_set_bitrate,
  	.set_cqm_txe_config = ath6kl_cfg80211_set_txe_config,
  };
  
  void ath6kl_cfg80211_stop(struct ath6kl_vif *vif)
  {
  	ath6kl_cfg80211_sscan_disable(vif);
  
  	switch (vif->sme_state) {
  	case SME_DISCONNECTED:
  		break;
  	case SME_CONNECTING:
  		cfg80211_connect_result(vif->ndev, vif->bssid, NULL, 0,
  					NULL, 0,
  					WLAN_STATUS_UNSPECIFIED_FAILURE,
  					GFP_KERNEL);
  		break;
  	case SME_CONNECTED:
  		cfg80211_disconnected(vif->ndev, 0, NULL, 0, true, GFP_KERNEL);
  		break;
  	}
  
  	if (vif->ar->state != ATH6KL_STATE_RECOVERY &&
  	    (test_bit(CONNECTED, &vif->flags) ||
  	    test_bit(CONNECT_PEND, &vif->flags)))
  		ath6kl_wmi_disconnect_cmd(vif->ar->wmi, vif->fw_vif_idx);
  
  	vif->sme_state = SME_DISCONNECTED;
  	clear_bit(CONNECTED, &vif->flags);
  	clear_bit(CONNECT_PEND, &vif->flags);
  
  	/* Stop netdev queues, needed during recovery */
  	netif_stop_queue(vif->ndev);
  	netif_carrier_off(vif->ndev);
  
  	/* disable scanning */
  	if (vif->ar->state != ATH6KL_STATE_RECOVERY &&
  	    ath6kl_wmi_scanparams_cmd(vif->ar->wmi, vif->fw_vif_idx, 0xFFFF,
  				      0, 0, 0, 0, 0, 0, 0, 0, 0) != 0)
  		ath6kl_warn("failed to disable scan during stop
  ");
  
  	ath6kl_cfg80211_scan_complete_event(vif, true);
  }
  
  void ath6kl_cfg80211_stop_all(struct ath6kl *ar)
  {
  	struct ath6kl_vif *vif;
  
  	vif = ath6kl_vif_first(ar);
  	if (!vif && ar->state != ATH6KL_STATE_RECOVERY) {
  		/* save the current power mode before enabling power save */
  		ar->wmi->saved_pwr_mode = ar->wmi->pwr_mode;
  
  		if (ath6kl_wmi_powermode_cmd(ar->wmi, 0, REC_POWER) != 0)
  			ath6kl_warn("ath6kl_deep_sleep_enable: wmi_powermode_cmd failed
  ");
  		return;
  	}
  
  	/*
  	 * FIXME: we should take ar->list_lock to protect changes in the
  	 * vif_list, but that's not trivial to do as ath6kl_cfg80211_stop()
  	 * sleeps.
  	 */
  	list_for_each_entry(vif, &ar->vif_list, list)
  		ath6kl_cfg80211_stop(vif);
  }
  
  static void ath6kl_cfg80211_reg_notify(struct wiphy *wiphy,
  				       struct regulatory_request *request)
  {
  	struct ath6kl *ar = wiphy_priv(wiphy);
  	u32 rates[IEEE80211_NUM_BANDS];
  	int ret, i;
  
  	ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
  		   "cfg reg_notify %c%c%s%s initiator %d hint_type %d
  ",
  		   request->alpha2[0], request->alpha2[1],
  		   request->intersect ? " intersect" : "",
  		   request->processed ? " processed" : "",
  		   request->initiator, request->user_reg_hint_type);
  
  	if (request->user_reg_hint_type != NL80211_USER_REG_HINT_CELL_BASE)
  		return;
  
  	ret = ath6kl_wmi_set_regdomain_cmd(ar->wmi, request->alpha2);
  	if (ret) {
  		ath6kl_err("failed to set regdomain: %d
  ", ret);
  		return;
  	}
  
  	/*
  	 * Firmware will apply the regdomain change only after a scan is
  	 * issued and it will send a WMI_REGDOMAIN_EVENTID when it has been
  	 * changed.
  	 */
  
  	for (i = 0; i < IEEE80211_NUM_BANDS; i++)
  		if (wiphy->bands[i])
  			rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
  
  
  	ret = ath6kl_wmi_beginscan_cmd(ar->wmi, 0, WMI_LONG_SCAN, false,
  				       false, 0, ATH6KL_FG_SCAN_INTERVAL,
  				       0, NULL, false, rates);
  	if (ret) {
  		ath6kl_err("failed to start scan for a regdomain change: %d
  ",
  			   ret);
  		return;
  	}
  }
  
  static int ath6kl_cfg80211_vif_init(struct ath6kl_vif *vif)
  {
  	vif->aggr_cntxt = aggr_init(vif);
  	if (!vif->aggr_cntxt) {
  		ath6kl_err("failed to initialize aggr
  ");
  		return -ENOMEM;
  	}
  
  	setup_timer(&vif->disconnect_timer, disconnect_timer_handler,
  		    (unsigned long) vif->ndev);
  	setup_timer(&vif->sched_scan_timer, ath6kl_wmi_sscan_timer,
  		    (unsigned long) vif);
  
  	set_bit(WMM_ENABLED, &vif->flags);
  	spin_lock_init(&vif->if_lock);
  
  	INIT_LIST_HEAD(&vif->mc_filter);
  
  	return 0;
  }
  
  void ath6kl_cfg80211_vif_stop(struct ath6kl_vif *vif, bool wmi_ready)
  {
  	static u8 bcast_mac[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
  	bool discon_issued;
  
  	netif_stop_queue(vif->ndev);
  
  	clear_bit(WLAN_ENABLED, &vif->flags);
  
  	if (wmi_ready) {
  		discon_issued = test_bit(CONNECTED, &vif->flags) ||
  				test_bit(CONNECT_PEND, &vif->flags);
  		ath6kl_disconnect(vif);
  		del_timer(&vif->disconnect_timer);
  
  		if (discon_issued)
  			ath6kl_disconnect_event(vif, DISCONNECT_CMD,
  						(vif->nw_type & AP_NETWORK) ?
  						bcast_mac : vif->bssid,
  						0, NULL, 0);
  	}
  
  	if (vif->scan_req) {
  		cfg80211_scan_done(vif->scan_req, true);
  		vif->scan_req = NULL;
  	}
  
  	/* need to clean up enhanced bmiss detection fw state */
  	ath6kl_cfg80211_sta_bmiss_enhance(vif, false);
  }
  
  void ath6kl_cfg80211_vif_cleanup(struct ath6kl_vif *vif)
  {
  	struct ath6kl *ar = vif->ar;
  	struct ath6kl_mc_filter *mc_filter, *tmp;
  
  	aggr_module_destroy(vif->aggr_cntxt);
  
  	ar->avail_idx_map |= BIT(vif->fw_vif_idx);
  
  	if (vif->nw_type == ADHOC_NETWORK)
  		ar->ibss_if_active = false;
  
  	list_for_each_entry_safe(mc_filter, tmp, &vif->mc_filter, list) {
  		list_del(&mc_filter->list);
  		kfree(mc_filter);
  	}
  
  	unregister_netdevice(vif->ndev);
  
  	ar->num_vif--;
  }
  
  static const char ath6kl_gstrings_sta_stats[][ETH_GSTRING_LEN] = {
  	/* Common stats names used by many drivers. */
  	"tx_pkts_nic", "tx_bytes_nic", "rx_pkts_nic", "rx_bytes_nic",
  
  	/* TX stats. */
  	"d_tx_ucast_pkts", "d_tx_bcast_pkts",
  	"d_tx_ucast_bytes", "d_tx_bcast_bytes",
  	"d_tx_rts_ok", "d_tx_error", "d_tx_fail",
  	"d_tx_retry", "d_tx_multi_retry", "d_tx_rts_fail",
  	"d_tx_tkip_counter_measures",
  
  	/* RX Stats. */
  	"d_rx_ucast_pkts", "d_rx_ucast_rate", "d_rx_bcast_pkts",
  	"d_rx_ucast_bytes", "d_rx_bcast_bytes", "d_rx_frag_pkt",
  	"d_rx_error", "d_rx_crc_err", "d_rx_keycache_miss",
  	"d_rx_decrypt_crc_err", "d_rx_duplicate_frames",
  	"d_rx_mic_err", "d_rx_tkip_format_err", "d_rx_ccmp_format_err",
  	"d_rx_ccmp_replay_err",
  
  	/* Misc stats. */
  	"d_beacon_miss", "d_num_connects", "d_num_disconnects",
  	"d_beacon_avg_rssi", "d_arp_received", "d_arp_matched",
  	"d_arp_replied"
  };
  
  #define ATH6KL_STATS_LEN	ARRAY_SIZE(ath6kl_gstrings_sta_stats)
  
  static int ath6kl_get_sset_count(struct net_device *dev, int sset)
  {
  	int rv = 0;
  
  	if (sset == ETH_SS_STATS)
  		rv += ATH6KL_STATS_LEN;
  
  	if (rv == 0)
  		return -EOPNOTSUPP;
  	return rv;
  }
  
  static void ath6kl_get_stats(struct net_device *dev,
  			    struct ethtool_stats *stats,
  			    u64 *data)
  {
  	struct ath6kl_vif *vif = netdev_priv(dev);
  	struct ath6kl *ar = vif->ar;
  	int i = 0;
  	struct target_stats *tgt_stats;
  
  	memset(data, 0, sizeof(u64) * ATH6KL_STATS_LEN);
  
  	ath6kl_read_tgt_stats(ar, vif);
  
  	tgt_stats = &vif->target_stats;
  
  	data[i++] = tgt_stats->tx_ucast_pkt + tgt_stats->tx_bcast_pkt;
  	data[i++] = tgt_stats->tx_ucast_byte + tgt_stats->tx_bcast_byte;
  	data[i++] = tgt_stats->rx_ucast_pkt + tgt_stats->rx_bcast_pkt;
  	data[i++] = tgt_stats->rx_ucast_byte + tgt_stats->rx_bcast_byte;
  
  	data[i++] = tgt_stats->tx_ucast_pkt;
  	data[i++] = tgt_stats->tx_bcast_pkt;
  	data[i++] = tgt_stats->tx_ucast_byte;
  	data[i++] = tgt_stats->tx_bcast_byte;
  	data[i++] = tgt_stats->tx_rts_success_cnt;
  	data[i++] = tgt_stats->tx_err;
  	data[i++] = tgt_stats->tx_fail_cnt;
  	data[i++] = tgt_stats->tx_retry_cnt;
  	data[i++] = tgt_stats->tx_mult_retry_cnt;
  	data[i++] = tgt_stats->tx_rts_fail_cnt;
  	data[i++] = tgt_stats->tkip_cnter_measures_invoked;
  
  	data[i++] = tgt_stats->rx_ucast_pkt;
  	data[i++] = tgt_stats->rx_ucast_rate;
  	data[i++] = tgt_stats->rx_bcast_pkt;
  	data[i++] = tgt_stats->rx_ucast_byte;
  	data[i++] = tgt_stats->rx_bcast_byte;
  	data[i++] = tgt_stats->rx_frgment_pkt;
  	data[i++] = tgt_stats->rx_err;
  	data[i++] = tgt_stats->rx_crc_err;
  	data[i++] = tgt_stats->rx_key_cache_miss;
  	data[i++] = tgt_stats->rx_decrypt_err;
  	data[i++] = tgt_stats->rx_dupl_frame;
  	data[i++] = tgt_stats->tkip_local_mic_fail;
  	data[i++] = tgt_stats->tkip_fmt_err;
  	data[i++] = tgt_stats->ccmp_fmt_err;
  	data[i++] = tgt_stats->ccmp_replays;
  
  	data[i++] = tgt_stats->cs_bmiss_cnt;
  	data[i++] = tgt_stats->cs_connect_cnt;
  	data[i++] = tgt_stats->cs_discon_cnt;
  	data[i++] = tgt_stats->cs_ave_beacon_rssi;
  	data[i++] = tgt_stats->arp_received;
  	data[i++] = tgt_stats->arp_matched;
  	data[i++] = tgt_stats->arp_replied;
  
  	if (i !=  ATH6KL_STATS_LEN) {
  		WARN_ON_ONCE(1);
  		ath6kl_err("ethtool stats error, i: %d  STATS_LEN: %d
  ",
  			   i, (int)ATH6KL_STATS_LEN);
  	}
  }
  
  /* These stats are per NIC, not really per vdev, so we just ignore dev. */
  static void ath6kl_get_strings(struct net_device *dev, u32 sset, u8 *data)
  {
  	int sz_sta_stats = 0;
  
  	if (sset == ETH_SS_STATS) {
  		sz_sta_stats = sizeof(ath6kl_gstrings_sta_stats);
  		memcpy(data, ath6kl_gstrings_sta_stats, sz_sta_stats);
  	}
  }
  
  static const struct ethtool_ops ath6kl_ethtool_ops = {
  	.get_drvinfo = cfg80211_get_drvinfo,
  	.get_link = ethtool_op_get_link,
  	.get_strings = ath6kl_get_strings,
  	.get_ethtool_stats = ath6kl_get_stats,
  	.get_sset_count = ath6kl_get_sset_count,
  };
  
  struct wireless_dev *ath6kl_interface_add(struct ath6kl *ar, const char *name,
  					  unsigned char name_assign_type,
  					  enum nl80211_iftype type,
  					  u8 fw_vif_idx, u8 nw_type)
  {
  	struct net_device *ndev;
  	struct ath6kl_vif *vif;
  
  	ndev = alloc_netdev(sizeof(*vif), name, name_assign_type, ether_setup);
  	if (!ndev)
  		return NULL;
  
  	vif = netdev_priv(ndev);
  	ndev->ieee80211_ptr = &vif->wdev;
  	vif->wdev.wiphy = ar->wiphy;
  	vif->ar = ar;
  	vif->ndev = ndev;
  	SET_NETDEV_DEV(ndev, wiphy_dev(vif->wdev.wiphy));
  	vif->wdev.netdev = ndev;
  	vif->wdev.iftype = type;
  	vif->fw_vif_idx = fw_vif_idx;
  	vif->nw_type = nw_type;
  	vif->next_mode = nw_type;
  	vif->listen_intvl_t = ATH6KL_DEFAULT_LISTEN_INTVAL;
  	vif->bmiss_time_t = ATH6KL_DEFAULT_BMISS_TIME;
  	vif->bg_scan_period = 0;
  	vif->htcap[IEEE80211_BAND_2GHZ].ht_enable = true;
  	vif->htcap[IEEE80211_BAND_5GHZ].ht_enable = true;
  
  	memcpy(ndev->dev_addr, ar->mac_addr, ETH_ALEN);
  	if (fw_vif_idx != 0) {
  		ndev->dev_addr[0] = (ndev->dev_addr[0] ^ (1 << fw_vif_idx)) |
  				     0x2;
  		if (test_bit(ATH6KL_FW_CAPABILITY_CUSTOM_MAC_ADDR,
  			     ar->fw_capabilities))
  			ndev->dev_addr[4] ^= 0x80;
  	}
  
  	init_netdev(ndev);
  
  	ath6kl_init_control_info(vif);
  
  	if (ath6kl_cfg80211_vif_init(vif))
  		goto err;
  
  	netdev_set_default_ethtool_ops(ndev, &ath6kl_ethtool_ops);
  
  	if (register_netdevice(ndev))
  		goto err;
  
  	ar->avail_idx_map &= ~BIT(fw_vif_idx);
  	vif->sme_state = SME_DISCONNECTED;
  	set_bit(WLAN_ENABLED, &vif->flags);
  	ar->wlan_pwr_state = WLAN_POWER_STATE_ON;
  
  	if (type == NL80211_IFTYPE_ADHOC)
  		ar->ibss_if_active = true;
  
  	spin_lock_bh(&ar->list_lock);
  	list_add_tail(&vif->list, &ar->vif_list);
  	spin_unlock_bh(&ar->list_lock);
  
  	return &vif->wdev;
  
  err:
  	aggr_module_destroy(vif->aggr_cntxt);
  	free_netdev(ndev);
  	return NULL;
  }
  
  #ifdef CONFIG_PM
  static const struct wiphy_wowlan_support ath6kl_wowlan_support = {
  	.flags = WIPHY_WOWLAN_MAGIC_PKT |
  		 WIPHY_WOWLAN_DISCONNECT |
  		 WIPHY_WOWLAN_GTK_REKEY_FAILURE  |
  		 WIPHY_WOWLAN_SUPPORTS_GTK_REKEY |
  		 WIPHY_WOWLAN_EAP_IDENTITY_REQ   |
  		 WIPHY_WOWLAN_4WAY_HANDSHAKE,
  	.n_patterns = WOW_MAX_FILTERS_PER_LIST,
  	.pattern_min_len = 1,
  	.pattern_max_len = WOW_PATTERN_SIZE,
  };
  #endif
  
  int ath6kl_cfg80211_init(struct ath6kl *ar)
  {
  	struct wiphy *wiphy = ar->wiphy;
  	bool band_2gig = false, band_5gig = false, ht = false;
  	int ret;
  
  	wiphy->mgmt_stypes = ath6kl_mgmt_stypes;
  
  	wiphy->max_remain_on_channel_duration = 5000;
  
  	/* set device pointer for wiphy */
  	set_wiphy_dev(wiphy, ar->dev);
  
  	wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
  				 BIT(NL80211_IFTYPE_ADHOC) |
  				 BIT(NL80211_IFTYPE_AP);
  	if (ar->p2p) {
  		wiphy->interface_modes |= BIT(NL80211_IFTYPE_P2P_GO) |
  					  BIT(NL80211_IFTYPE_P2P_CLIENT);
  	}
  
  	if (config_enabled(CONFIG_ATH6KL_REGDOMAIN) &&
  	    test_bit(ATH6KL_FW_CAPABILITY_REGDOMAIN, ar->fw_capabilities)) {
  		wiphy->reg_notifier = ath6kl_cfg80211_reg_notify;
  		ar->wiphy->features |= NL80211_FEATURE_CELL_BASE_REG_HINTS;
  	}
  
  	/* max num of ssids that can be probed during scanning */
  	wiphy->max_scan_ssids = MAX_PROBED_SSIDS;
  
  	/* max num of ssids that can be matched after scan */
  	if (test_bit(ATH6KL_FW_CAPABILITY_SCHED_SCAN_MATCH_LIST,
  		     ar->fw_capabilities))
  		wiphy->max_match_sets = MAX_PROBED_SSIDS;
  
  	wiphy->max_scan_ie_len = 1000; /* FIX: what is correct limit? */
  	switch (ar->hw.cap) {
  	case WMI_11AN_CAP:
  		ht = true;
  	case WMI_11A_CAP:
  		band_5gig = true;
  		break;
  	case WMI_11GN_CAP:
  		ht = true;
  	case WMI_11G_CAP:
  		band_2gig = true;
  		break;
  	case WMI_11AGN_CAP:
  		ht = true;
  	case WMI_11AG_CAP:
  		band_2gig = true;
  		band_5gig = true;
  		break;
  	default:
  		ath6kl_err("invalid phy capability!
  ");
  		return -EINVAL;
  	}
  
  	/*
  	 * Even if the fw has HT support, advertise HT cap only when
  	 * the firmware has support to override RSN capability, otherwise
  	 * 4-way handshake would fail.
  	 */
  	if (!(ht &&
  	      test_bit(ATH6KL_FW_CAPABILITY_RSN_CAP_OVERRIDE,
  		       ar->fw_capabilities))) {
  		ath6kl_band_2ghz.ht_cap.cap = 0;
  		ath6kl_band_2ghz.ht_cap.ht_supported = false;
  		ath6kl_band_5ghz.ht_cap.cap = 0;
  		ath6kl_band_5ghz.ht_cap.ht_supported = false;
  
  		if (ht)
  			ath6kl_err("Firmware lacks RSN-CAP-OVERRIDE, so HT (802.11n) is disabled.");
  	}
  
  	if (test_bit(ATH6KL_FW_CAPABILITY_64BIT_RATES,
  		     ar->fw_capabilities)) {
  		ath6kl_band_2ghz.ht_cap.mcs.rx_mask[0] = 0xff;
  		ath6kl_band_5ghz.ht_cap.mcs.rx_mask[0] = 0xff;
  		ath6kl_band_2ghz.ht_cap.mcs.rx_mask[1] = 0xff;
  		ath6kl_band_5ghz.ht_cap.mcs.rx_mask[1] = 0xff;
  		ar->hw.tx_ant = 2;
  		ar->hw.rx_ant = 2;
  	} else {
  		ath6kl_band_2ghz.ht_cap.mcs.rx_mask[0] = 0xff;
  		ath6kl_band_5ghz.ht_cap.mcs.rx_mask[0] = 0xff;
  		ar->hw.tx_ant = 1;
  		ar->hw.rx_ant = 1;
  	}
  
  	wiphy->available_antennas_tx = ar->hw.tx_ant;
  	wiphy->available_antennas_rx = ar->hw.rx_ant;
  
  	if (band_2gig)
  		wiphy->bands[IEEE80211_BAND_2GHZ] = &ath6kl_band_2ghz;
  	if (band_5gig)
  		wiphy->bands[IEEE80211_BAND_5GHZ] = &ath6kl_band_5ghz;
  
  	wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
  
  	wiphy->cipher_suites = cipher_suites;
  	wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
  
  #ifdef CONFIG_PM
  	wiphy->wowlan = &ath6kl_wowlan_support;
  #endif
  
  	wiphy->max_sched_scan_ssids = MAX_PROBED_SSIDS;
  
  	ar->wiphy->flags |= WIPHY_FLAG_SUPPORTS_FW_ROAM |
  			    WIPHY_FLAG_HAVE_AP_SME |
  			    WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL |
  			    WIPHY_FLAG_AP_PROBE_RESP_OFFLOAD;
  
  	if (test_bit(ATH6KL_FW_CAPABILITY_SCHED_SCAN_V2, ar->fw_capabilities))
  		ar->wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
  
  	if (test_bit(ATH6KL_FW_CAPABILITY_INACTIVITY_TIMEOUT,
  		     ar->fw_capabilities))
  		ar->wiphy->features |= NL80211_FEATURE_INACTIVITY_TIMER;
  
  	ar->wiphy->probe_resp_offload =
  		NL80211_PROBE_RESP_OFFLOAD_SUPPORT_WPS |
  		NL80211_PROBE_RESP_OFFLOAD_SUPPORT_WPS2 |
  		NL80211_PROBE_RESP_OFFLOAD_SUPPORT_P2P;
  
  	ret = wiphy_register(wiphy);
  	if (ret < 0) {
  		ath6kl_err("couldn't register wiphy device
  ");
  		return ret;
  	}
  
  	ar->wiphy_registered = true;
  
  	return 0;
  }
  
  void ath6kl_cfg80211_cleanup(struct ath6kl *ar)
  {
  	wiphy_unregister(ar->wiphy);
  
  	ar->wiphy_registered = false;
  }
  
  struct ath6kl *ath6kl_cfg80211_create(void)
  {
  	struct ath6kl *ar;
  	struct wiphy *wiphy;
  
  	/* create a new wiphy for use with cfg80211 */
  	wiphy = wiphy_new(&ath6kl_cfg80211_ops, sizeof(struct ath6kl));
  
  	if (!wiphy) {
  		ath6kl_err("couldn't allocate wiphy device
  ");
  		return NULL;
  	}
  
  	ar = wiphy_priv(wiphy);
  	ar->wiphy = wiphy;
  
  	return ar;
  }
  
  /* Note: ar variable must not be accessed after calling this! */
  void ath6kl_cfg80211_destroy(struct ath6kl *ar)
  {
  	int i;
  
  	for (i = 0; i < AP_MAX_NUM_STA; i++)
  		kfree(ar->sta_list[i].aggr_conn);
  
  	wiphy_free(ar->wiphy);
  }