/*
 * 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 <linux/sched/signal.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           = NL80211_BAND_2GHZ,  \
        .hw_value       = (_channel),           \
        .center_freq    = (_freq),              \
        .flags          = (_flags),             \
        .max_antenna_gain   = 0,                \
        .max_power      = 30,                   \
}

#define CHAN5G(_channel, _flags) {                  \
        .band           = NL80211_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(36, 0), CHAN5G(40, 0),
        CHAN5G(44, 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, 0);
}

static int ath6kl_set_wpa_version(struct ath6kl_vif *vif,
                                  enum nl80211_wpa_versions wpa_version)
{
        ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: %u\n", __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\n", __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\n", __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\n", __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\n",
                   __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\n", 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\n", __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\n");
                return false;
        }

        if (!test_bit(WLAN_ENABLED, &vif->flags)) {
                ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "wlan disabled\n");
                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\n", 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\n",
                   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\n",
                           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\n");
                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\n");
                return -EINVAL;
        }

        if (down_interruptible(&ar->sem)) {
                ath6kl_err("busy, couldn't get access\n");
                return -ERESTARTSYS;
        }

        if (test_bit(DESTROY_IN_PROGRESS, &ar->flag)) {
                ath6kl_err("busy, destroy in progress\n");
                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\n");
                        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\n");
                        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\n",
                                   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\n");
                        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\n",
                   __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\n");
                        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\n");
                return -ENOENT;
        } else if (status) {
                ath6kl_err("ath6kl_wmi_connect_cmd failed\n");
                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\n", bssid);
                kfree(ie);
        } else {
                ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "cfg80211 already has a bss\n");
        }

        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\n", __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\n", __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\n");
                return;
        }

        if (nw_type & ADHOC_NETWORK) {
                ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "ad-hoc %s selected\n",
                           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) {
                struct cfg80211_roam_info roam_info = {
                        .bss = bss,
                        .req_ie = assoc_req_ie,
                        .req_ie_len = assoc_req_len,
                        .resp_ie = assoc_resp_ie,
                        .resp_ie_len = assoc_resp_len,
                };
                /* inform roam event to cfg80211 */
                cfg80211_roamed(vif->ndev, &roam_info, 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\n", __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\n");
                return -EBUSY;
        }

        if (down_interruptible(&ar->sem)) {
                ath6kl_err("busy, couldn't get access\n");
                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);

        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) {
                struct cfg80211_scan_info info = {
                        .aborted = true,
                };

                cfg80211_scan_done(vif->scan_req, &info);
                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\n", __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\n", __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 (ar->wiphy->max_match_sets != 0 && 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\n");
                        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\n");
                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 = kcalloc(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\n", 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;
        struct cfg80211_scan_info info = {
                .aborted = aborted,
        };
        int i;

        ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: status%s\n", __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, DISABLE_SSID_FLAG,
                                                  0, NULL);
                }
        }

out:
        cfg80211_scan_done(vif->scan_req, &info);
        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\n",
                   vif->nw_type, freq, mode);

        cfg80211_chandef_create(&chandef,
                                ieee80211_get_channel(vif->ar->wiphy, freq),
                                (mode == WMI_11G_HT20 &&
                                 ath6kl_band_2ghz.ht_cap.ht_supported) ?
                                        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\n", __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\n",
                   __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\n");
                        /*
                         * 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\n");
                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\n", __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\n", __func__,
                           key_index);
                return -ENOENT;
        }

        if (!vif->keys[key_index].key_len) {
                ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
                           "%s: index %d is empty\n", __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\n", __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\n", __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 ath6kl_crypto_type key_type = NONE_CRYPT;

        ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: index %d\n", __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\n",
                           __func__, key_index);
                return -ENOENT;
        }

        if (!vif->keys[key_index].key_len) {
                ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: invalid key index %d\n",
                           __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\n", __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\n", __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\n");
                        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\n", __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\n",
                           __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 = 255;

                if (ath6kl_wmi_get_tx_pwr_cmd(ar->wmi, vif->fw_vif_idx) != 0) {
                        ath6kl_err("ath6kl_wmi_get_tx_pwr_cmd failed\n");
                        return -EIO;
                }

                wait_event_interruptible_timeout(ar->event_wq, ar->tx_pwr != 255,
                                                 5 * HZ);

                if (signal_pending(current)) {
                        ath6kl_err("target did not respond\n");
                        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\n",
                   __func__, pmgmt, timeout);

        if (!ath6kl_cfg80211_ready(vif))
                return -EIO;

        if (pmgmt) {
                ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: rec power\n", __func__);
                mode.pwr_mode = REC_POWER;
        } else {
                ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: max perf\n", __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\n");
                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,
                                                      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\n");
                return ERR_PTR(-EINVAL);
        }

        if (!ath6kl_is_valid_iftype(ar, type, &if_idx, &nw_type)) {
                ath6kl_err("Not a supported interface type\n");
                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,
                                        struct vif_params *params)
{
        struct ath6kl_vif *vif = netdev_priv(ndev);
        int i;

        ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "%s: type %u\n", __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\n");
                        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\n", 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\n",
                   __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_ULL(NL80211_STA_INFO_RX_BYTES64);
                sinfo->rx_packets = vif->target_stats.rx_pkt;
                sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_PACKETS);
        }

        if (vif->target_stats.tx_byte) {
                sinfo->tx_bytes = vif->target_stats.tx_byte;
                sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_BYTES64);
                sinfo->tx_packets = vif->target_stats.tx_pkt;
                sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_PACKETS);
        }

        sinfo->signal = vif->target_stats.cs_rssi;
        sinfo->filled |= BIT_ULL(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\n", rate);
                ath6kl_debug_war(ar, ATH6KL_WAR_INVALID_RATE);
                return 0;
        }

        sinfo->filled |= BIT_ULL(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_ULL(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\n");
                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\n");
                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\n");
                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\n");
                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\n");
                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\n");
                        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\n");
                ret = -ETIMEDOUT;
        } else if (left < 0) {
                ath6kl_warn("error while waiting for host sleep cmd processed event %d\n",
                            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\n");
                        ret = -ETIMEDOUT;
                } else if (left < 0) {
                        ath6kl_warn("clear wmi ctrl data failed: %d\n", 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 = rtnl_dereference(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 = rtnl_dereference(ifa->ifa_next);
                index++;
        }

        if (ifa) {
                ath6kl_err("total IP addr count is exceeding fw limit\n");
                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\n");
                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\n",
                            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\n");
                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\n");

                /* 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\n");

                ret = ath6kl_cfg80211_deepsleep_suspend(ar);
                if (ret) {
                        ath6kl_err("deepsleep suspend failed: %d\n", 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\n");
                        break;
                }

                ath6kl_dbg(ATH6KL_DBG_SUSPEND, "suspend cutting power\n");

                ret = ath6kl_init_hw_stop(ar);
                if (ret) {
                        ath6kl_warn("failed to stop hw during suspend: %d\n",
                                    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\n");

                ret = ath6kl_wow_resume(ar);
                if (ret) {
                        ath6kl_warn("wow mode resume failed: %d\n", ret);
                        return ret;
                }

                break;

        case ATH6KL_STATE_DEEPSLEEP:
                ath6kl_dbg(ATH6KL_DBG_SUSPEND, "deep sleep resume\n");

                ret = ath6kl_cfg80211_deepsleep_resume(ar);
                if (ret) {
                        ath6kl_warn("deep sleep resume failed: %d\n", ret);
                        return ret;
                }
                break;

        case ATH6KL_STATE_CUTPOWER:
                ath6kl_dbg(ATH6KL_DBG_SUSPEND, "resume restoring power\n");

                ret = ath6kl_init_hw_start(ar);
                if (ret) {
                        ath6kl_warn("Failed to boot hw in resume: %d\n", 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 nl80211_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 == NL80211_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 < NUM_NL80211_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;
        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:\n", __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\n", 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\n", 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;

        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);
        netif_carrier_off(vif->ndev);

        /* 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);
}