/*
 * Marvell Wireless LAN device driver: CFG80211
 *
 * Copyright (C) 2011-2014, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include "cfg80211.h"
#include "main.h"
#include "11n.h"
#include "wmm.h"

static char *reg_alpha2;
module_param(reg_alpha2, charp, 0);

static const struct ieee80211_iface_limit mwifiex_ap_sta_limits[] = {
        {
                .max = 3, .types = BIT(NL80211_IFTYPE_STATION) |
                                   BIT(NL80211_IFTYPE_P2P_GO) |
                                   BIT(NL80211_IFTYPE_P2P_CLIENT) |
                                   BIT(NL80211_IFTYPE_AP),
        },
};

static const struct ieee80211_iface_combination
mwifiex_iface_comb_ap_sta = {
        .limits = mwifiex_ap_sta_limits,
        .num_different_channels = 1,
        .n_limits = ARRAY_SIZE(mwifiex_ap_sta_limits),
        .max_interfaces = MWIFIEX_MAX_BSS_NUM,
        .beacon_int_infra_match = true,
        .radar_detect_widths =  BIT(NL80211_CHAN_WIDTH_20_NOHT) |
                                BIT(NL80211_CHAN_WIDTH_20) |
                                BIT(NL80211_CHAN_WIDTH_40),
};

static const struct ieee80211_iface_combination
mwifiex_iface_comb_ap_sta_vht = {
        .limits = mwifiex_ap_sta_limits,
        .num_different_channels = 1,
        .n_limits = ARRAY_SIZE(mwifiex_ap_sta_limits),
        .max_interfaces = MWIFIEX_MAX_BSS_NUM,
        .beacon_int_infra_match = true,
        .radar_detect_widths =  BIT(NL80211_CHAN_WIDTH_20_NOHT) |
                                BIT(NL80211_CHAN_WIDTH_20) |
                                BIT(NL80211_CHAN_WIDTH_40) |
                                BIT(NL80211_CHAN_WIDTH_80),
};

static const struct
ieee80211_iface_combination mwifiex_iface_comb_ap_sta_drcs = {
        .limits = mwifiex_ap_sta_limits,
        .num_different_channels = 2,
        .n_limits = ARRAY_SIZE(mwifiex_ap_sta_limits),
        .max_interfaces = MWIFIEX_MAX_BSS_NUM,
        .beacon_int_infra_match = true,
};

/*
 * This function maps the nl802.11 channel type into driver channel type.
 *
 * The mapping is as follows -
 *      NL80211_CHAN_NO_HT     -> IEEE80211_HT_PARAM_CHA_SEC_NONE
 *      NL80211_CHAN_HT20      -> IEEE80211_HT_PARAM_CHA_SEC_NONE
 *      NL80211_CHAN_HT40PLUS  -> IEEE80211_HT_PARAM_CHA_SEC_ABOVE
 *      NL80211_CHAN_HT40MINUS -> IEEE80211_HT_PARAM_CHA_SEC_BELOW
 *      Others                 -> IEEE80211_HT_PARAM_CHA_SEC_NONE
 */
u8 mwifiex_chan_type_to_sec_chan_offset(enum nl80211_channel_type chan_type)
{
        switch (chan_type) {
        case NL80211_CHAN_NO_HT:
        case NL80211_CHAN_HT20:
                return IEEE80211_HT_PARAM_CHA_SEC_NONE;
        case NL80211_CHAN_HT40PLUS:
                return IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
        case NL80211_CHAN_HT40MINUS:
                return IEEE80211_HT_PARAM_CHA_SEC_BELOW;
        default:
                return IEEE80211_HT_PARAM_CHA_SEC_NONE;
        }
}

/* This function maps IEEE HT secondary channel type to NL80211 channel type
 */
u8 mwifiex_sec_chan_offset_to_chan_type(u8 second_chan_offset)
{
        switch (second_chan_offset) {
        case IEEE80211_HT_PARAM_CHA_SEC_NONE:
                return NL80211_CHAN_HT20;
        case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
                return NL80211_CHAN_HT40PLUS;
        case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
                return NL80211_CHAN_HT40MINUS;
        default:
                return NL80211_CHAN_HT20;
        }
}

/*
 * This function checks whether WEP is set.
 */
static int
mwifiex_is_alg_wep(u32 cipher)
{
        switch (cipher) {
        case WLAN_CIPHER_SUITE_WEP40:
        case WLAN_CIPHER_SUITE_WEP104:
                return 1;
        default:
                break;
        }

        return 0;
}

/*
 * This function retrieves the private structure from kernel wiphy structure.
 */
static void *mwifiex_cfg80211_get_adapter(struct wiphy *wiphy)
{
        return (void *) (*(unsigned long *) wiphy_priv(wiphy));
}

/*
 * CFG802.11 operation handler to delete a network key.
 */
static int
mwifiex_cfg80211_del_key(struct wiphy *wiphy, struct net_device *netdev,
                         u8 key_index, bool pairwise, const u8 *mac_addr)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(netdev);
        static const u8 bc_mac[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
        const u8 *peer_mac = pairwise ? mac_addr : bc_mac;

        if (mwifiex_set_encode(priv, NULL, NULL, 0, key_index, peer_mac, 1)) {
                mwifiex_dbg(priv->adapter, ERROR, "deleting the crypto keys\n");
                return -EFAULT;
        }

        mwifiex_dbg(priv->adapter, INFO, "info: crypto keys deleted\n");
        return 0;
}

/*
 * This function forms an skb for management frame.
 */
static int
mwifiex_form_mgmt_frame(struct sk_buff *skb, const u8 *buf, size_t len)
{
        u8 addr[ETH_ALEN] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
        u16 pkt_len;
        u32 tx_control = 0, pkt_type = PKT_TYPE_MGMT;

        pkt_len = len + ETH_ALEN;

        skb_reserve(skb, MWIFIEX_MIN_DATA_HEADER_LEN +
                    MWIFIEX_MGMT_FRAME_HEADER_SIZE + sizeof(pkt_len));
        memcpy(skb_push(skb, sizeof(pkt_len)), &pkt_len, sizeof(pkt_len));

        memcpy(skb_push(skb, sizeof(tx_control)),
               &tx_control, sizeof(tx_control));

        memcpy(skb_push(skb, sizeof(pkt_type)), &pkt_type, sizeof(pkt_type));

        /* Add packet data and address4 */
        skb_put_data(skb, buf, sizeof(struct ieee80211_hdr_3addr));
        skb_put_data(skb, addr, ETH_ALEN);
        skb_put_data(skb, buf + sizeof(struct ieee80211_hdr_3addr),
                     len - sizeof(struct ieee80211_hdr_3addr));

        skb->priority = LOW_PRIO_TID;
        __net_timestamp(skb);

        return 0;
}

/*
 * CFG802.11 operation handler to transmit a management frame.
 */
static int
mwifiex_cfg80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
                         struct cfg80211_mgmt_tx_params *params, u64 *cookie)
{
        const u8 *buf = params->buf;
        size_t len = params->len;
        struct sk_buff *skb;
        u16 pkt_len;
        const struct ieee80211_mgmt *mgmt;
        struct mwifiex_txinfo *tx_info;
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(wdev->netdev);

        if (!buf || !len) {
                mwifiex_dbg(priv->adapter, ERROR, "invalid buffer and length\n");
                return -EFAULT;
        }

        mgmt = (const struct ieee80211_mgmt *)buf;
        if (GET_BSS_ROLE(priv) != MWIFIEX_BSS_ROLE_STA &&
            ieee80211_is_probe_resp(mgmt->frame_control)) {
                /* Since we support offload probe resp, we need to skip probe
                 * resp in AP or GO mode */
                mwifiex_dbg(priv->adapter, INFO,
                            "info: skip to send probe resp in AP or GO mode\n");
                return 0;
        }

        pkt_len = len + ETH_ALEN;
        skb = dev_alloc_skb(MWIFIEX_MIN_DATA_HEADER_LEN +
                            MWIFIEX_MGMT_FRAME_HEADER_SIZE +
                            pkt_len + sizeof(pkt_len));

        if (!skb) {
                mwifiex_dbg(priv->adapter, ERROR,
                            "allocate skb failed for management frame\n");
                return -ENOMEM;
        }

        tx_info = MWIFIEX_SKB_TXCB(skb);
        memset(tx_info, 0, sizeof(*tx_info));
        tx_info->bss_num = priv->bss_num;
        tx_info->bss_type = priv->bss_type;
        tx_info->pkt_len = pkt_len;

        mwifiex_form_mgmt_frame(skb, buf, len);
        *cookie = prandom_u32() | 1;

        if (ieee80211_is_action(mgmt->frame_control))
                skb = mwifiex_clone_skb_for_tx_status(priv,
                                                      skb,
                                MWIFIEX_BUF_FLAG_ACTION_TX_STATUS, cookie);
        else
                cfg80211_mgmt_tx_status(wdev, *cookie, buf, len, true,
                                        GFP_ATOMIC);

        mwifiex_queue_tx_pkt(priv, skb);

        mwifiex_dbg(priv->adapter, INFO, "info: management frame transmitted\n");
        return 0;
}

/*
 * CFG802.11 operation handler to register a mgmt frame.
 */
static void
mwifiex_cfg80211_mgmt_frame_register(struct wiphy *wiphy,
                                     struct wireless_dev *wdev,
                                     u16 frame_type, bool reg)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(wdev->netdev);
        u32 mask;

        if (reg)
                mask = priv->mgmt_frame_mask | BIT(frame_type >> 4);
        else
                mask = priv->mgmt_frame_mask & ~BIT(frame_type >> 4);

        if (mask != priv->mgmt_frame_mask) {
                priv->mgmt_frame_mask = mask;
                mwifiex_send_cmd(priv, HostCmd_CMD_MGMT_FRAME_REG,
                                 HostCmd_ACT_GEN_SET, 0,
                                 &priv->mgmt_frame_mask, false);
                mwifiex_dbg(priv->adapter, INFO, "info: mgmt frame registered\n");
        }
}

/*
 * CFG802.11 operation handler to remain on channel.
 */
static int
mwifiex_cfg80211_remain_on_channel(struct wiphy *wiphy,
                                   struct wireless_dev *wdev,
                                   struct ieee80211_channel *chan,
                                   unsigned int duration, u64 *cookie)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(wdev->netdev);
        int ret;

        if (!chan || !cookie) {
                mwifiex_dbg(priv->adapter, ERROR, "Invalid parameter for ROC\n");
                return -EINVAL;
        }

        if (priv->roc_cfg.cookie) {
                mwifiex_dbg(priv->adapter, INFO,
                            "info: ongoing ROC, cookie = 0x%llx\n",
                            priv->roc_cfg.cookie);
                return -EBUSY;
        }

        ret = mwifiex_remain_on_chan_cfg(priv, HostCmd_ACT_GEN_SET, chan,
                                         duration);

        if (!ret) {
                *cookie = prandom_u32() | 1;
                priv->roc_cfg.cookie = *cookie;
                priv->roc_cfg.chan = *chan;

                cfg80211_ready_on_channel(wdev, *cookie, chan,
                                          duration, GFP_ATOMIC);

                mwifiex_dbg(priv->adapter, INFO,
                            "info: ROC, cookie = 0x%llx\n", *cookie);
        }

        return ret;
}

/*
 * CFG802.11 operation handler to cancel remain on channel.
 */
static int
mwifiex_cfg80211_cancel_remain_on_channel(struct wiphy *wiphy,
                                          struct wireless_dev *wdev, u64 cookie)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(wdev->netdev);
        int ret;

        if (cookie != priv->roc_cfg.cookie)
                return -ENOENT;

        ret = mwifiex_remain_on_chan_cfg(priv, HostCmd_ACT_GEN_REMOVE,
                                         &priv->roc_cfg.chan, 0);

        if (!ret) {
                cfg80211_remain_on_channel_expired(wdev, cookie,
                                                   &priv->roc_cfg.chan,
                                                   GFP_ATOMIC);

                memset(&priv->roc_cfg, 0, sizeof(struct mwifiex_roc_cfg));

                mwifiex_dbg(priv->adapter, INFO,
                            "info: cancel ROC, cookie = 0x%llx\n", cookie);
        }

        return ret;
}

/*
 * CFG802.11 operation handler to set Tx power.
 */
static int
mwifiex_cfg80211_set_tx_power(struct wiphy *wiphy,
                              struct wireless_dev *wdev,
                              enum nl80211_tx_power_setting type,
                              int mbm)
{
        struct mwifiex_adapter *adapter = mwifiex_cfg80211_get_adapter(wiphy);
        struct mwifiex_private *priv;
        struct mwifiex_power_cfg power_cfg;
        int dbm = MBM_TO_DBM(mbm);

        if (type == NL80211_TX_POWER_FIXED) {
                power_cfg.is_power_auto = 0;
                power_cfg.power_level = dbm;
        } else {
                power_cfg.is_power_auto = 1;
        }

        priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);

        return mwifiex_set_tx_power(priv, &power_cfg);
}

/*
 * CFG802.11 operation handler to get Tx power.
 */
static int
mwifiex_cfg80211_get_tx_power(struct wiphy *wiphy,
                              struct wireless_dev *wdev,
                              int *dbm)
{
        struct mwifiex_adapter *adapter = mwifiex_cfg80211_get_adapter(wiphy);
        struct mwifiex_private *priv = mwifiex_get_priv(adapter,
                                                        MWIFIEX_BSS_ROLE_ANY);
        int ret = mwifiex_send_cmd(priv, HostCmd_CMD_RF_TX_PWR,
                                   HostCmd_ACT_GEN_GET, 0, NULL, true);

        if (ret < 0)
                return ret;

        /* tx_power_level is set in HostCmd_CMD_RF_TX_PWR command handler */
        *dbm = priv->tx_power_level;

        return 0;
}

/*
 * CFG802.11 operation handler to set Power Save option.
 *
 * The timeout value, if provided, is currently ignored.
 */
static int
mwifiex_cfg80211_set_power_mgmt(struct wiphy *wiphy,
                                struct net_device *dev,
                                bool enabled, int timeout)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
        u32 ps_mode;

        if (timeout)
                mwifiex_dbg(priv->adapter, INFO,
                            "info: ignore timeout value for IEEE Power Save\n");

        ps_mode = enabled;

        return mwifiex_drv_set_power(priv, &ps_mode);
}

/*
 * CFG802.11 operation handler to set the default network key.
 */
static int
mwifiex_cfg80211_set_default_key(struct wiphy *wiphy, struct net_device *netdev,
                                 u8 key_index, bool unicast,
                                 bool multicast)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(netdev);

        /* Return if WEP key not configured */
        if (!priv->sec_info.wep_enabled)
                return 0;

        if (priv->bss_type == MWIFIEX_BSS_TYPE_UAP) {
                priv->wep_key_curr_index = key_index;
        } else if (mwifiex_set_encode(priv, NULL, NULL, 0, key_index,
                                      NULL, 0)) {
                mwifiex_dbg(priv->adapter, ERROR, "set default Tx key index\n");
                return -EFAULT;
        }

        return 0;
}

/*
 * CFG802.11 operation handler to add a network key.
 */
static int
mwifiex_cfg80211_add_key(struct wiphy *wiphy, struct net_device *netdev,
                         u8 key_index, bool pairwise, const u8 *mac_addr,
                         struct key_params *params)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(netdev);
        struct mwifiex_wep_key *wep_key;
        static const u8 bc_mac[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
        const u8 *peer_mac = pairwise ? mac_addr : bc_mac;

        if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP &&
            (params->cipher == WLAN_CIPHER_SUITE_WEP40 ||
             params->cipher == WLAN_CIPHER_SUITE_WEP104)) {
                if (params->key && params->key_len) {
                        wep_key = &priv->wep_key[key_index];
                        memset(wep_key, 0, sizeof(struct mwifiex_wep_key));
                        memcpy(wep_key->key_material, params->key,
                               params->key_len);
                        wep_key->key_index = key_index;
                        wep_key->key_length = params->key_len;
                        priv->sec_info.wep_enabled = 1;
                }
                return 0;
        }

        if (mwifiex_set_encode(priv, params, params->key, params->key_len,
                               key_index, peer_mac, 0)) {
                mwifiex_dbg(priv->adapter, ERROR, "crypto keys added\n");
                return -EFAULT;
        }

        return 0;
}

/*
 * CFG802.11 operation handler to set default mgmt key.
 */
static int
mwifiex_cfg80211_set_default_mgmt_key(struct wiphy *wiphy,
                                      struct net_device *netdev,
                                      u8 key_index)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(netdev);
        struct mwifiex_ds_encrypt_key encrypt_key;

        wiphy_dbg(wiphy, "set default mgmt key, key index=%d\n", key_index);

        memset(&encrypt_key, 0, sizeof(struct mwifiex_ds_encrypt_key));
        encrypt_key.key_len = WLAN_KEY_LEN_CCMP;
        encrypt_key.key_index = key_index;
        encrypt_key.is_igtk_def_key = true;
        eth_broadcast_addr(encrypt_key.mac_addr);

        return mwifiex_send_cmd(priv, HostCmd_CMD_802_11_KEY_MATERIAL,
                                HostCmd_ACT_GEN_SET, true, &encrypt_key, true);
}

/*
 * This function sends domain information to the firmware.
 *
 * The following information are passed to the firmware -
 *      - Country codes
 *      - Sub bands (first channel, number of channels, maximum Tx power)
 */
int mwifiex_send_domain_info_cmd_fw(struct wiphy *wiphy)
{
        u8 no_of_triplet = 0;
        struct ieee80211_country_ie_triplet *t;
        u8 no_of_parsed_chan = 0;
        u8 first_chan = 0, next_chan = 0, max_pwr = 0;
        u8 i, flag = 0;
        enum nl80211_band band;
        struct ieee80211_supported_band *sband;
        struct ieee80211_channel *ch;
        struct mwifiex_adapter *adapter = mwifiex_cfg80211_get_adapter(wiphy);
        struct mwifiex_private *priv;
        struct mwifiex_802_11d_domain_reg *domain_info = &adapter->domain_reg;

        /* Set country code */
        domain_info->country_code[0] = adapter->country_code[0];
        domain_info->country_code[1] = adapter->country_code[1];
        domain_info->country_code[2] = ' ';

        band = mwifiex_band_to_radio_type(adapter->config_bands);
        if (!wiphy->bands[band]) {
                mwifiex_dbg(adapter, ERROR,
                            "11D: setting domain info in FW\n");
                return -1;
        }

        sband = wiphy->bands[band];

        for (i = 0; i < sband->n_channels ; i++) {
                ch = &sband->channels[i];
                if (ch->flags & IEEE80211_CHAN_DISABLED)
                        continue;

                if (!flag) {
                        flag = 1;
                        first_chan = (u32) ch->hw_value;
                        next_chan = first_chan;
                        max_pwr = ch->max_power;
                        no_of_parsed_chan = 1;
                        continue;
                }

                if (ch->hw_value == next_chan + 1 &&
                    ch->max_power == max_pwr) {
                        next_chan++;
                        no_of_parsed_chan++;
                } else {
                        t = &domain_info->triplet[no_of_triplet];
                        t->chans.first_channel = first_chan;
                        t->chans.num_channels = no_of_parsed_chan;
                        t->chans.max_power = max_pwr;
                        no_of_triplet++;
                        first_chan = (u32) ch->hw_value;
                        next_chan = first_chan;
                        max_pwr = ch->max_power;
                        no_of_parsed_chan = 1;
                }
        }

        if (flag) {
                t = &domain_info->triplet[no_of_triplet];
                t->chans.first_channel = first_chan;
                t->chans.num_channels = no_of_parsed_chan;
                t->chans.max_power = max_pwr;
                no_of_triplet++;
        }

        domain_info->no_of_triplet = no_of_triplet;

        priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);

        if (mwifiex_send_cmd(priv, HostCmd_CMD_802_11D_DOMAIN_INFO,
                             HostCmd_ACT_GEN_SET, 0, NULL, false)) {
                mwifiex_dbg(adapter, INFO,
                            "11D: setting domain info in FW\n");
                return -1;
        }

        return 0;
}

static void mwifiex_reg_apply_radar_flags(struct wiphy *wiphy)
{
        struct ieee80211_supported_band *sband;
        struct ieee80211_channel *chan;
        unsigned int i;

        if (!wiphy->bands[NL80211_BAND_5GHZ])
                return;
        sband = wiphy->bands[NL80211_BAND_5GHZ];

        for (i = 0; i < sband->n_channels; i++) {
                chan = &sband->channels[i];
                if ((!(chan->flags & IEEE80211_CHAN_DISABLED)) &&
                    (chan->flags & IEEE80211_CHAN_RADAR))
                        chan->flags |= IEEE80211_CHAN_NO_IR;
        }
}

/*
 * CFG802.11 regulatory domain callback function.
 *
 * This function is called when the regulatory domain is changed due to the
 * following reasons -
 *      - Set by driver
 *      - Set by system core
 *      - Set by user
 *      - Set bt Country IE
 */
static void mwifiex_reg_notifier(struct wiphy *wiphy,
                                 struct regulatory_request *request)
{
        struct mwifiex_adapter *adapter = mwifiex_cfg80211_get_adapter(wiphy);
        struct mwifiex_private *priv = mwifiex_get_priv(adapter,
                                                        MWIFIEX_BSS_ROLE_ANY);
        mwifiex_dbg(adapter, INFO,
                    "info: cfg80211 regulatory domain callback for %c%c\n",
                    request->alpha2[0], request->alpha2[1]);
        mwifiex_reg_apply_radar_flags(wiphy);

        switch (request->initiator) {
        case NL80211_REGDOM_SET_BY_DRIVER:
        case NL80211_REGDOM_SET_BY_CORE:
        case NL80211_REGDOM_SET_BY_USER:
        case NL80211_REGDOM_SET_BY_COUNTRY_IE:
                break;
        default:
                mwifiex_dbg(adapter, ERROR,
                            "unknown regdom initiator: %d\n",
                            request->initiator);
                return;
        }

        /* Don't send world or same regdom info to firmware */
        if (strncmp(request->alpha2, "00", 2) &&
            strncmp(request->alpha2, adapter->country_code,
                    sizeof(request->alpha2))) {
                memcpy(adapter->country_code, request->alpha2,
                       sizeof(request->alpha2));
                mwifiex_send_domain_info_cmd_fw(wiphy);
                mwifiex_dnld_txpwr_table(priv);
        }
}

/*
 * This function sets the fragmentation threshold.
 *
 * The fragmentation threshold value must lie between MWIFIEX_FRAG_MIN_VALUE
 * and MWIFIEX_FRAG_MAX_VALUE.
 */
static int
mwifiex_set_frag(struct mwifiex_private *priv, u32 frag_thr)
{
        if (frag_thr < MWIFIEX_FRAG_MIN_VALUE ||
            frag_thr > MWIFIEX_FRAG_MAX_VALUE)
                frag_thr = MWIFIEX_FRAG_MAX_VALUE;

        return mwifiex_send_cmd(priv, HostCmd_CMD_802_11_SNMP_MIB,
                                HostCmd_ACT_GEN_SET, FRAG_THRESH_I,
                                &frag_thr, true);
}

/*
 * This function sets the RTS threshold.

 * The rts value must lie between MWIFIEX_RTS_MIN_VALUE
 * and MWIFIEX_RTS_MAX_VALUE.
 */
static int
mwifiex_set_rts(struct mwifiex_private *priv, u32 rts_thr)
{
        if (rts_thr < MWIFIEX_RTS_MIN_VALUE || rts_thr > MWIFIEX_RTS_MAX_VALUE)
                rts_thr = MWIFIEX_RTS_MAX_VALUE;

        return mwifiex_send_cmd(priv, HostCmd_CMD_802_11_SNMP_MIB,
                                HostCmd_ACT_GEN_SET, RTS_THRESH_I,
                                &rts_thr, true);
}

/*
 * CFG802.11 operation handler to set wiphy parameters.
 *
 * This function can be used to set the RTS threshold and the
 * Fragmentation threshold of the driver.
 */
static int
mwifiex_cfg80211_set_wiphy_params(struct wiphy *wiphy, u32 changed)
{
        struct mwifiex_adapter *adapter = mwifiex_cfg80211_get_adapter(wiphy);
        struct mwifiex_private *priv;
        struct mwifiex_uap_bss_param *bss_cfg;
        int ret;

        priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);

        switch (priv->bss_role) {
        case MWIFIEX_BSS_ROLE_UAP:
                if (priv->bss_started) {
                        mwifiex_dbg(adapter, ERROR,
                                    "cannot change wiphy params when bss started");
                        return -EINVAL;
                }

                bss_cfg = kzalloc(sizeof(*bss_cfg), GFP_KERNEL);
                if (!bss_cfg)
                        return -ENOMEM;

                mwifiex_set_sys_config_invalid_data(bss_cfg);

                if (changed & WIPHY_PARAM_RTS_THRESHOLD)
                        bss_cfg->rts_threshold = wiphy->rts_threshold;
                if (changed & WIPHY_PARAM_FRAG_THRESHOLD)
                        bss_cfg->frag_threshold = wiphy->frag_threshold;
                if (changed & WIPHY_PARAM_RETRY_LONG)
                        bss_cfg->retry_limit = wiphy->retry_long;

                ret = mwifiex_send_cmd(priv, HostCmd_CMD_UAP_SYS_CONFIG,
                                       HostCmd_ACT_GEN_SET,
                                       UAP_BSS_PARAMS_I, bss_cfg,
                                       false);

                kfree(bss_cfg);
                if (ret) {
                        mwifiex_dbg(adapter, ERROR,
                                    "Failed to set wiphy phy params\n");
                        return ret;
                }
                break;

        case MWIFIEX_BSS_ROLE_STA:
                if (priv->media_connected) {
                        mwifiex_dbg(adapter, ERROR,
                                    "cannot change wiphy params when connected");
                        return -EINVAL;
                }
                if (changed & WIPHY_PARAM_RTS_THRESHOLD) {
                        ret = mwifiex_set_rts(priv,
                                              wiphy->rts_threshold);
                        if (ret)
                                return ret;
                }
                if (changed & WIPHY_PARAM_FRAG_THRESHOLD) {
                        ret = mwifiex_set_frag(priv,
                                               wiphy->frag_threshold);
                        if (ret)
                                return ret;
                }
                break;
        }

        return 0;
}

static int
mwifiex_cfg80211_deinit_p2p(struct mwifiex_private *priv)
{
        u16 mode = P2P_MODE_DISABLE;

        if (mwifiex_send_cmd(priv, HostCmd_CMD_P2P_MODE_CFG,
                             HostCmd_ACT_GEN_SET, 0, &mode, true))
                return -1;

        return 0;
}

/*
 * This function initializes the functionalities for P2P client.
 * The P2P client initialization sequence is:
 * disable -> device -> client
 */
static int
mwifiex_cfg80211_init_p2p_client(struct mwifiex_private *priv)
{
        u16 mode;

        if (mwifiex_cfg80211_deinit_p2p(priv))
                return -1;

        mode = P2P_MODE_DEVICE;
        if (mwifiex_send_cmd(priv, HostCmd_CMD_P2P_MODE_CFG,
                             HostCmd_ACT_GEN_SET, 0, &mode, true))
                return -1;

        mode = P2P_MODE_CLIENT;
        if (mwifiex_send_cmd(priv, HostCmd_CMD_P2P_MODE_CFG,
                             HostCmd_ACT_GEN_SET, 0, &mode, true))
                return -1;

        return 0;
}

/*
 * This function initializes the functionalities for P2P GO.
 * The P2P GO initialization sequence is:
 * disable -> device -> GO
 */
static int
mwifiex_cfg80211_init_p2p_go(struct mwifiex_private *priv)
{
        u16 mode;

        if (mwifiex_cfg80211_deinit_p2p(priv))
                return -1;

        mode = P2P_MODE_DEVICE;
        if (mwifiex_send_cmd(priv, HostCmd_CMD_P2P_MODE_CFG,
                             HostCmd_ACT_GEN_SET, 0, &mode, true))
                return -1;

        mode = P2P_MODE_GO;
        if (mwifiex_send_cmd(priv, HostCmd_CMD_P2P_MODE_CFG,
                             HostCmd_ACT_GEN_SET, 0, &mode, true))
                return -1;

        return 0;
}

static int mwifiex_deinit_priv_params(struct mwifiex_private *priv)
{
        struct mwifiex_adapter *adapter = priv->adapter;
        unsigned long flags;

        priv->mgmt_frame_mask = 0;
        if (mwifiex_send_cmd(priv, HostCmd_CMD_MGMT_FRAME_REG,
                             HostCmd_ACT_GEN_SET, 0,
                             &priv->mgmt_frame_mask, false)) {
                mwifiex_dbg(adapter, ERROR,
                            "could not unregister mgmt frame rx\n");
                return -1;
        }

        mwifiex_deauthenticate(priv, NULL);

        spin_lock_irqsave(&adapter->main_proc_lock, flags);
        adapter->main_locked = true;
        if (adapter->mwifiex_processing) {
                spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
                flush_workqueue(adapter->workqueue);
        } else {
                spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
        }

        spin_lock_irqsave(&adapter->rx_proc_lock, flags);
        adapter->rx_locked = true;
        if (adapter->rx_processing) {
                spin_unlock_irqrestore(&adapter->rx_proc_lock, flags);
                flush_workqueue(adapter->rx_workqueue);
        } else {
        spin_unlock_irqrestore(&adapter->rx_proc_lock, flags);
        }

        mwifiex_free_priv(priv);
        priv->wdev.iftype = NL80211_IFTYPE_UNSPECIFIED;
        priv->bss_mode = NL80211_IFTYPE_UNSPECIFIED;
        priv->sec_info.authentication_mode = NL80211_AUTHTYPE_OPEN_SYSTEM;

        return 0;
}

static int
mwifiex_init_new_priv_params(struct mwifiex_private *priv,
                             struct net_device *dev,
                             enum nl80211_iftype type)
{
        struct mwifiex_adapter *adapter = priv->adapter;
        unsigned long flags;

        mwifiex_init_priv(priv);

        priv->bss_mode = type;
        priv->wdev.iftype = type;

        mwifiex_init_priv_params(priv, priv->netdev);
        priv->bss_started = 0;

        switch (type) {
        case NL80211_IFTYPE_STATION:
        case NL80211_IFTYPE_ADHOC:
                priv->bss_role =  MWIFIEX_BSS_ROLE_STA;
                break;
        case NL80211_IFTYPE_P2P_CLIENT:
                priv->bss_role =  MWIFIEX_BSS_ROLE_STA;
                break;
        case NL80211_IFTYPE_P2P_GO:
                priv->bss_role =  MWIFIEX_BSS_ROLE_UAP;
                break;
        case NL80211_IFTYPE_AP:
                priv->bss_role = MWIFIEX_BSS_ROLE_UAP;
                break;
        default:
                mwifiex_dbg(adapter, ERROR,
                            "%s: changing to %d not supported\n",
                            dev->name, type);
                return -EOPNOTSUPP;
        }

        spin_lock_irqsave(&adapter->main_proc_lock, flags);
        adapter->main_locked = false;
        spin_unlock_irqrestore(&adapter->main_proc_lock, flags);

        spin_lock_irqsave(&adapter->rx_proc_lock, flags);
        adapter->rx_locked = false;
        spin_unlock_irqrestore(&adapter->rx_proc_lock, flags);

        mwifiex_set_mac_address(priv, dev);

        return 0;
}

static int
mwifiex_change_vif_to_p2p(struct net_device *dev,
                          enum nl80211_iftype curr_iftype,
                          enum nl80211_iftype type,
                          struct vif_params *params)
{
        struct mwifiex_private *priv;
        struct mwifiex_adapter *adapter;

        priv = mwifiex_netdev_get_priv(dev);

        if (!priv)
                return -1;

        adapter = priv->adapter;

        if (adapter->curr_iface_comb.p2p_intf ==
            adapter->iface_limit.p2p_intf) {
                mwifiex_dbg(adapter, ERROR,
                            "cannot create multiple P2P ifaces\n");
                return -1;
        }

        mwifiex_dbg(adapter, INFO,
                    "%s: changing role to p2p\n", dev->name);

        if (mwifiex_deinit_priv_params(priv))
                return -1;
        if (mwifiex_init_new_priv_params(priv, dev, type))
                return -1;

        switch (type) {
        case NL80211_IFTYPE_P2P_CLIENT:
                if (mwifiex_cfg80211_init_p2p_client(priv))
                        return -EFAULT;
                break;
        case NL80211_IFTYPE_P2P_GO:
                if (mwifiex_cfg80211_init_p2p_go(priv))
                        return -EFAULT;
                break;
        default:
                mwifiex_dbg(adapter, ERROR,
                            "%s: changing to %d not supported\n",
                            dev->name, type);
                return -EOPNOTSUPP;
        }

        if (mwifiex_send_cmd(priv, HostCmd_CMD_SET_BSS_MODE,
                             HostCmd_ACT_GEN_SET, 0, NULL, true))
                return -1;

        if (mwifiex_sta_init_cmd(priv, false, false))
                return -1;

        switch (curr_iftype) {
        case NL80211_IFTYPE_STATION:
        case NL80211_IFTYPE_ADHOC:
                adapter->curr_iface_comb.sta_intf--;
                break;
        case NL80211_IFTYPE_AP:
                adapter->curr_iface_comb.uap_intf--;
                break;
        default:
                break;
        }

        adapter->curr_iface_comb.p2p_intf++;
        dev->ieee80211_ptr->iftype = type;

        return 0;
}

static int
mwifiex_change_vif_to_sta_adhoc(struct net_device *dev,
                                enum nl80211_iftype curr_iftype,
                                enum nl80211_iftype type,
                                struct vif_params *params)
{

        struct mwifiex_private *priv;
        struct mwifiex_adapter *adapter;

        priv = mwifiex_netdev_get_priv(dev);

        if (!priv)
                return -1;

        adapter = priv->adapter;

        if ((curr_iftype != NL80211_IFTYPE_P2P_CLIENT &&
             curr_iftype != NL80211_IFTYPE_P2P_GO) &&
            (adapter->curr_iface_comb.sta_intf ==
             adapter->iface_limit.sta_intf)) {
                mwifiex_dbg(adapter, ERROR,
                            "cannot create multiple station/adhoc ifaces\n");
                return -1;
        }

        if (type == NL80211_IFTYPE_STATION)
                mwifiex_dbg(adapter, INFO,
                            "%s: changing role to station\n", dev->name);
        else
                mwifiex_dbg(adapter, INFO,
                            "%s: changing role to adhoc\n", dev->name);

        if (mwifiex_deinit_priv_params(priv))
                return -1;
        if (mwifiex_init_new_priv_params(priv, dev, type))
                return -1;
        if (mwifiex_send_cmd(priv, HostCmd_CMD_SET_BSS_MODE,
                             HostCmd_ACT_GEN_SET, 0, NULL, true))
                return -1;
        if (mwifiex_sta_init_cmd(priv, false, false))
                return -1;

        switch (curr_iftype) {
        case NL80211_IFTYPE_P2P_CLIENT:
        case NL80211_IFTYPE_P2P_GO:
                adapter->curr_iface_comb.p2p_intf--;
                break;
        case NL80211_IFTYPE_AP:
                adapter->curr_iface_comb.uap_intf--;
                break;
        default:
                break;
        }

        adapter->curr_iface_comb.sta_intf++;
        dev->ieee80211_ptr->iftype = type;
        return 0;
}

static int
mwifiex_change_vif_to_ap(struct net_device *dev,
                         enum nl80211_iftype curr_iftype,
                         enum nl80211_iftype type,
                         struct vif_params *params)
{
        struct mwifiex_private *priv;
        struct mwifiex_adapter *adapter;

        priv = mwifiex_netdev_get_priv(dev);

        if (!priv)
                return -1;

        adapter = priv->adapter;

        if (adapter->curr_iface_comb.uap_intf ==
            adapter->iface_limit.uap_intf) {
                mwifiex_dbg(adapter, ERROR,
                            "cannot create multiple AP ifaces\n");
                return -1;
        }

        mwifiex_dbg(adapter, INFO,
                    "%s: changing role to AP\n", dev->name);

        if (mwifiex_deinit_priv_params(priv))
                return -1;
        if (mwifiex_init_new_priv_params(priv, dev, type))
                return -1;
        if (mwifiex_send_cmd(priv, HostCmd_CMD_SET_BSS_MODE,
                             HostCmd_ACT_GEN_SET, 0, NULL, true))
                return -1;
        if (mwifiex_sta_init_cmd(priv, false, false))
                return -1;

        switch (curr_iftype) {
        case NL80211_IFTYPE_P2P_CLIENT:
        case NL80211_IFTYPE_P2P_GO:
                adapter->curr_iface_comb.p2p_intf--;
                break;
        case NL80211_IFTYPE_STATION:
        case NL80211_IFTYPE_ADHOC:
                adapter->curr_iface_comb.sta_intf--;
                break;
        default:
                break;
        }

        adapter->curr_iface_comb.uap_intf++;
        dev->ieee80211_ptr->iftype = type;
        return 0;
}
/*
 * CFG802.11 operation handler to change interface type.
 */
static int
mwifiex_cfg80211_change_virtual_intf(struct wiphy *wiphy,
                                     struct net_device *dev,
                                     enum nl80211_iftype type,
                                     struct vif_params *params)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
        enum nl80211_iftype curr_iftype = dev->ieee80211_ptr->iftype;

        if (priv->scan_request) {
                mwifiex_dbg(priv->adapter, ERROR,
                            "change virtual interface: scan in process\n");
                return -EBUSY;
        }

        switch (curr_iftype) {
        case NL80211_IFTYPE_ADHOC:
                switch (type) {
                case NL80211_IFTYPE_STATION:
                        priv->bss_mode = type;
                        priv->sec_info.authentication_mode =
                                                   NL80211_AUTHTYPE_OPEN_SYSTEM;
                        dev->ieee80211_ptr->iftype = type;
                        mwifiex_deauthenticate(priv, NULL);
                        return mwifiex_send_cmd(priv, HostCmd_CMD_SET_BSS_MODE,
                                                HostCmd_ACT_GEN_SET, 0, NULL,
                                                true);
                case NL80211_IFTYPE_P2P_CLIENT:
                case NL80211_IFTYPE_P2P_GO:
                        return mwifiex_change_vif_to_p2p(dev, curr_iftype,
                                                         type, params);
                case NL80211_IFTYPE_AP:
                        return mwifiex_change_vif_to_ap(dev, curr_iftype, type,
                                                        params);
                case NL80211_IFTYPE_UNSPECIFIED:
                        mwifiex_dbg(priv->adapter, INFO,
                                    "%s: kept type as IBSS\n", dev->name);
                case NL80211_IFTYPE_ADHOC:      /* This shouldn't happen */
                        return 0;
                default:
                        mwifiex_dbg(priv->adapter, ERROR,
                                    "%s: changing to %d not supported\n",
                                    dev->name, type);
                        return -EOPNOTSUPP;
                }
                break;
        case NL80211_IFTYPE_STATION:
                switch (type) {
                case NL80211_IFTYPE_ADHOC:
                        priv->bss_mode = type;
                        priv->sec_info.authentication_mode =
                                                   NL80211_AUTHTYPE_OPEN_SYSTEM;
                        dev->ieee80211_ptr->iftype = type;
                        mwifiex_deauthenticate(priv, NULL);
                        return mwifiex_send_cmd(priv, HostCmd_CMD_SET_BSS_MODE,
                                                HostCmd_ACT_GEN_SET, 0, NULL,
                                                true);
                case NL80211_IFTYPE_P2P_CLIENT:
                case NL80211_IFTYPE_P2P_GO:
                        return mwifiex_change_vif_to_p2p(dev, curr_iftype,
                                                         type, params);
                case NL80211_IFTYPE_AP:
                        return mwifiex_change_vif_to_ap(dev, curr_iftype, type,
                                                        params);
                case NL80211_IFTYPE_UNSPECIFIED:
                        mwifiex_dbg(priv->adapter, INFO,
                                    "%s: kept type as STA\n", dev->name);
                case NL80211_IFTYPE_STATION:    /* This shouldn't happen */
                        return 0;
                default:
                        mwifiex_dbg(priv->adapter, ERROR,
                                    "%s: changing to %d not supported\n",
                                    dev->name, type);
                        return -EOPNOTSUPP;
                }
                break;
        case NL80211_IFTYPE_AP:
                switch (type) {
                case NL80211_IFTYPE_ADHOC:
                        return mwifiex_change_vif_to_sta_adhoc(dev, curr_iftype,
                                                               type, params);
                        break;
                case NL80211_IFTYPE_P2P_CLIENT:
                case NL80211_IFTYPE_P2P_GO:
                        return mwifiex_change_vif_to_p2p(dev, curr_iftype,
                                                         type, params);
                case NL80211_IFTYPE_UNSPECIFIED:
                        mwifiex_dbg(priv->adapter, INFO,
                                    "%s: kept type as AP\n", dev->name);
                case NL80211_IFTYPE_AP:         /* This shouldn't happen */
                        return 0;
                default:
                        mwifiex_dbg(priv->adapter, ERROR,
                                    "%s: changing to %d not supported\n",
                                    dev->name, type);
                        return -EOPNOTSUPP;
                }
                break;
        case NL80211_IFTYPE_P2P_CLIENT:
        case NL80211_IFTYPE_P2P_GO:
                switch (type) {
                case NL80211_IFTYPE_STATION:
                        if (mwifiex_cfg80211_deinit_p2p(priv))
                                return -EFAULT;
                        priv->adapter->curr_iface_comb.p2p_intf--;
                        priv->adapter->curr_iface_comb.sta_intf++;
                        dev->ieee80211_ptr->iftype = type;
                        if (mwifiex_deinit_priv_params(priv))
                                return -1;
                        if (mwifiex_init_new_priv_params(priv, dev, type))
                                return -1;
                        if (mwifiex_sta_init_cmd(priv, false, false))
                                return -1;
                        break;
                case NL80211_IFTYPE_ADHOC:
                        if (mwifiex_cfg80211_deinit_p2p(priv))
                                return -EFAULT;
                        return mwifiex_change_vif_to_sta_adhoc(dev, curr_iftype,
                                                               type, params);
                        break;
                case NL80211_IFTYPE_AP:
                        if (mwifiex_cfg80211_deinit_p2p(priv))
                                return -EFAULT;
                        return mwifiex_change_vif_to_ap(dev, curr_iftype, type,
                                                        params);
                case NL80211_IFTYPE_UNSPECIFIED:
                        mwifiex_dbg(priv->adapter, INFO,
                                    "%s: kept type as P2P\n", dev->name);
                case NL80211_IFTYPE_P2P_CLIENT:
                case NL80211_IFTYPE_P2P_GO:
                        return 0;
                default:
                        mwifiex_dbg(priv->adapter, ERROR,
                                    "%s: changing to %d not supported\n",
                                    dev->name, type);
                        return -EOPNOTSUPP;
                }
                break;
        default:
                mwifiex_dbg(priv->adapter, ERROR,
                            "%s: unknown iftype: %d\n",
                            dev->name, dev->ieee80211_ptr->iftype);
                return -EOPNOTSUPP;
        }


        return 0;
}

static void
mwifiex_parse_htinfo(struct mwifiex_private *priv, u8 tx_htinfo,
                     struct rate_info *rate)
{
        struct mwifiex_adapter *adapter = priv->adapter;

        if (adapter->is_hw_11ac_capable) {
                /* bit[1-0]: 00=LG 01=HT 10=VHT */
                if (tx_htinfo & BIT(0)) {
                        /* HT */
                        rate->mcs = priv->tx_rate;
                        rate->flags |= RATE_INFO_FLAGS_MCS;
                }
                if (tx_htinfo & BIT(1)) {
                        /* VHT */
                        rate->mcs = priv->tx_rate & 0x0F;
                        rate->flags |= RATE_INFO_FLAGS_VHT_MCS;
                }

                if (tx_htinfo & (BIT(1) | BIT(0))) {
                        /* HT or VHT */
                        switch (tx_htinfo & (BIT(3) | BIT(2))) {
                        case 0:
                                rate->bw = RATE_INFO_BW_20;
                                break;
                        case (BIT(2)):
                                rate->bw = RATE_INFO_BW_40;
                                break;
                        case (BIT(3)):
                                rate->bw = RATE_INFO_BW_80;
                                break;
                        case (BIT(3) | BIT(2)):
                                rate->bw = RATE_INFO_BW_160;
                                break;
                        }

                        if (tx_htinfo & BIT(4))
                                rate->flags |= RATE_INFO_FLAGS_SHORT_GI;

                        if ((priv->tx_rate >> 4) == 1)
                                rate->nss = 2;
                        else
                                rate->nss = 1;
                }
        } else {
                /*
                 * Bit 0 in tx_htinfo indicates that current Tx rate
                 * is 11n rate. Valid MCS index values for us are 0 to 15.
                 */
                if ((tx_htinfo & BIT(0)) && (priv->tx_rate < 16)) {
                        rate->mcs = priv->tx_rate;
                        rate->flags |= RATE_INFO_FLAGS_MCS;
                        rate->bw = RATE_INFO_BW_20;
                        if (tx_htinfo & BIT(1))
                                rate->bw = RATE_INFO_BW_40;
                        if (tx_htinfo & BIT(2))
                                rate->flags |= RATE_INFO_FLAGS_SHORT_GI;
                }
        }
}

/*
 * This function dumps the station information on a buffer.
 *
 * The following information are shown -
 *      - Total bytes transmitted
 *      - Total bytes received
 *      - Total packets transmitted
 *      - Total packets received
 *      - Signal quality level
 *      - Transmission rate
 */
static int
mwifiex_dump_station_info(struct mwifiex_private *priv,
                          struct mwifiex_sta_node *node,
                          struct station_info *sinfo)
{
        u32 rate;

        sinfo->filled = BIT(NL80211_STA_INFO_RX_BYTES) | BIT(NL80211_STA_INFO_TX_BYTES) |
                        BIT(NL80211_STA_INFO_RX_PACKETS) | BIT(NL80211_STA_INFO_TX_PACKETS) |
                        BIT(NL80211_STA_INFO_TX_BITRATE) |
                        BIT(NL80211_STA_INFO_SIGNAL) | BIT(NL80211_STA_INFO_SIGNAL_AVG);

        if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) {
                if (!node)
                        return -ENOENT;

                sinfo->filled |= BIT(NL80211_STA_INFO_INACTIVE_TIME) |
                                BIT(NL80211_STA_INFO_TX_FAILED);
                sinfo->inactive_time =
                        jiffies_to_msecs(jiffies - node->stats.last_rx);

                sinfo->signal = node->stats.rssi;
                sinfo->signal_avg = node->stats.rssi;
                sinfo->rx_bytes = node->stats.rx_bytes;
                sinfo->tx_bytes = node->stats.tx_bytes;
                sinfo->rx_packets = node->stats.rx_packets;
                sinfo->tx_packets = node->stats.tx_packets;
                sinfo->tx_failed = node->stats.tx_failed;

                mwifiex_parse_htinfo(priv, node->stats.last_tx_htinfo,
                                     &sinfo->txrate);
                sinfo->txrate.legacy = node->stats.last_tx_rate * 5;

                return 0;
        }

        /* Get signal information from the firmware */
        if (mwifiex_send_cmd(priv, HostCmd_CMD_RSSI_INFO,
                             HostCmd_ACT_GEN_GET, 0, NULL, true)) {
                mwifiex_dbg(priv->adapter, ERROR,
                            "failed to get signal information\n");
                return -EFAULT;
        }

        if (mwifiex_drv_get_data_rate(priv, &rate)) {
                mwifiex_dbg(priv->adapter, ERROR,
                            "getting data rate error\n");
                return -EFAULT;
        }

        /* Get DTIM period information from firmware */
        mwifiex_send_cmd(priv, HostCmd_CMD_802_11_SNMP_MIB,
                         HostCmd_ACT_GEN_GET, DTIM_PERIOD_I,
                         &priv->dtim_period, true);

        mwifiex_parse_htinfo(priv, priv->tx_htinfo, &sinfo->txrate);

        sinfo->signal_avg = priv->bcn_rssi_avg;
        sinfo->rx_bytes = priv->stats.rx_bytes;
        sinfo->tx_bytes = priv->stats.tx_bytes;
        sinfo->rx_packets = priv->stats.rx_packets;
        sinfo->tx_packets = priv->stats.tx_packets;
        sinfo->signal = priv->bcn_rssi_avg;
        /* bit rate is in 500 kb/s units. Convert it to 100kb/s units */
        sinfo->txrate.legacy = rate * 5;

        if (priv->bss_mode == NL80211_IFTYPE_STATION) {
                sinfo->filled |= BIT(NL80211_STA_INFO_BSS_PARAM);
                sinfo->bss_param.flags = 0;
                if (priv->curr_bss_params.bss_descriptor.cap_info_bitmap &
                                                WLAN_CAPABILITY_SHORT_PREAMBLE)
                        sinfo->bss_param.flags |=
                                        BSS_PARAM_FLAGS_SHORT_PREAMBLE;
                if (priv->curr_bss_params.bss_descriptor.cap_info_bitmap &
                                                WLAN_CAPABILITY_SHORT_SLOT_TIME)
                        sinfo->bss_param.flags |=
                                        BSS_PARAM_FLAGS_SHORT_SLOT_TIME;
                sinfo->bss_param.dtim_period = priv->dtim_period;
                sinfo->bss_param.beacon_interval =
                        priv->curr_bss_params.bss_descriptor.beacon_period;
        }

        return 0;
}

/*
 * CFG802.11 operation handler to get station information.
 *
 * This function only works in connected mode, and dumps the
 * requested station information, if available.
 */
static int
mwifiex_cfg80211_get_station(struct wiphy *wiphy, struct net_device *dev,
                             const u8 *mac, struct station_info *sinfo)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);

        if (!priv->media_connected)
                return -ENOENT;
        if (memcmp(mac, priv->cfg_bssid, ETH_ALEN))
                return -ENOENT;

        return mwifiex_dump_station_info(priv, NULL, sinfo);
}

/*
 * CFG802.11 operation handler to dump station information.
 */
static int
mwifiex_cfg80211_dump_station(struct wiphy *wiphy, struct net_device *dev,
                              int idx, u8 *mac, struct station_info *sinfo)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
        static struct mwifiex_sta_node *node;

        if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
            priv->media_connected && idx == 0) {
                ether_addr_copy(mac, priv->cfg_bssid);
                return mwifiex_dump_station_info(priv, NULL, sinfo);
        } else if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) {
                mwifiex_send_cmd(priv, HOST_CMD_APCMD_STA_LIST,
                                 HostCmd_ACT_GEN_GET, 0, NULL, true);

                if (node && (&node->list == &priv->sta_list)) {
                        node = NULL;
                        return -ENOENT;
                }

                node = list_prepare_entry(node, &priv->sta_list, list);
                list_for_each_entry_continue(node, &priv->sta_list, list) {
                        ether_addr_copy(mac, node->mac_addr);
                        return mwifiex_dump_station_info(priv, node, sinfo);
                }
        }

        return -ENOENT;
}

static int
mwifiex_cfg80211_dump_survey(struct wiphy *wiphy, struct net_device *dev,
                             int idx, struct survey_info *survey)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
        struct mwifiex_chan_stats *pchan_stats = priv->adapter->chan_stats;
        enum nl80211_band band;

        mwifiex_dbg(priv->adapter, DUMP, "dump_survey idx=%d\n", idx);

        memset(survey, 0, sizeof(struct survey_info));

        if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
            priv->media_connected && idx == 0) {
                        u8 curr_bss_band = priv->curr_bss_params.band;
                        u32 chan = priv->curr_bss_params.bss_descriptor.channel;

                        band = mwifiex_band_to_radio_type(curr_bss_band);
                        survey->channel = ieee80211_get_channel(wiphy,
                                ieee80211_channel_to_frequency(chan, band));

                        if (priv->bcn_nf_last) {
                                survey->filled = SURVEY_INFO_NOISE_DBM;
                                survey->noise = priv->bcn_nf_last;
                        }
                        return 0;
        }

        if (idx >= priv->adapter->num_in_chan_stats)
                return -ENOENT;

        if (!pchan_stats[idx].cca_scan_dur)
                return 0;

        band = pchan_stats[idx].bandcfg;
        survey->channel = ieee80211_get_channel(wiphy,
            ieee80211_channel_to_frequency(pchan_stats[idx].chan_num, band));
        survey->filled = SURVEY_INFO_NOISE_DBM |
                         SURVEY_INFO_TIME |
                         SURVEY_INFO_TIME_BUSY;
        survey->noise = pchan_stats[idx].noise;
        survey->time = pchan_stats[idx].cca_scan_dur;
        survey->time_busy = pchan_stats[idx].cca_busy_dur;

        return 0;
}

/* Supported rates to be advertised to the cfg80211 */
static struct ieee80211_rate mwifiex_rates[] = {
        {.bitrate = 10, .hw_value = 2, },
        {.bitrate = 20, .hw_value = 4, },
        {.bitrate = 55, .hw_value = 11, },
        {.bitrate = 110, .hw_value = 22, },
        {.bitrate = 60, .hw_value = 12, },
        {.bitrate = 90, .hw_value = 18, },
        {.bitrate = 120, .hw_value = 24, },
        {.bitrate = 180, .hw_value = 36, },
        {.bitrate = 240, .hw_value = 48, },
        {.bitrate = 360, .hw_value = 72, },
        {.bitrate = 480, .hw_value = 96, },
        {.bitrate = 540, .hw_value = 108, },
};

/* Channel definitions to be advertised to cfg80211 */
static struct ieee80211_channel mwifiex_channels_2ghz[] = {
        {.center_freq = 2412, .hw_value = 1, },
        {.center_freq = 2417, .hw_value = 2, },
        {.center_freq = 2422, .hw_value = 3, },
        {.center_freq = 2427, .hw_value = 4, },
        {.center_freq = 2432, .hw_value = 5, },
        {.center_freq = 2437, .hw_value = 6, },
        {.center_freq = 2442, .hw_value = 7, },
        {.center_freq = 2447, .hw_value = 8, },
        {.center_freq = 2452, .hw_value = 9, },
        {.center_freq = 2457, .hw_value = 10, },
        {.center_freq = 2462, .hw_value = 11, },
        {.center_freq = 2467, .hw_value = 12, },
        {.center_freq = 2472, .hw_value = 13, },
        {.center_freq = 2484, .hw_value = 14, },
};

static struct ieee80211_supported_band mwifiex_band_2ghz = {
        .channels = mwifiex_channels_2ghz,
        .n_channels = ARRAY_SIZE(mwifiex_channels_2ghz),
        .bitrates = mwifiex_rates,
        .n_bitrates = ARRAY_SIZE(mwifiex_rates),
};

static struct ieee80211_channel mwifiex_channels_5ghz[] = {
        {.center_freq = 5040, .hw_value = 8, },
        {.center_freq = 5060, .hw_value = 12, },
        {.center_freq = 5080, .hw_value = 16, },
        {.center_freq = 5170, .hw_value = 34, },
        {.center_freq = 5190, .hw_value = 38, },
        {.center_freq = 5210, .hw_value = 42, },
        {.center_freq = 5230, .hw_value = 46, },
        {.center_freq = 5180, .hw_value = 36, },
        {.center_freq = 5200, .hw_value = 40, },
        {.center_freq = 5220, .hw_value = 44, },
        {.center_freq = 5240, .hw_value = 48, },
        {.center_freq = 5260, .hw_value = 52, },
        {.center_freq = 5280, .hw_value = 56, },
        {.center_freq = 5300, .hw_value = 60, },
        {.center_freq = 5320, .hw_value = 64, },
        {.center_freq = 5500, .hw_value = 100, },
        {.center_freq = 5520, .hw_value = 104, },
        {.center_freq = 5540, .hw_value = 108, },
        {.center_freq = 5560, .hw_value = 112, },
        {.center_freq = 5580, .hw_value = 116, },
        {.center_freq = 5600, .hw_value = 120, },
        {.center_freq = 5620, .hw_value = 124, },
        {.center_freq = 5640, .hw_value = 128, },
        {.center_freq = 5660, .hw_value = 132, },
        {.center_freq = 5680, .hw_value = 136, },
        {.center_freq = 5700, .hw_value = 140, },
        {.center_freq = 5745, .hw_value = 149, },
        {.center_freq = 5765, .hw_value = 153, },
        {.center_freq = 5785, .hw_value = 157, },
        {.center_freq = 5805, .hw_value = 161, },
        {.center_freq = 5825, .hw_value = 165, },
};

static struct ieee80211_supported_band mwifiex_band_5ghz = {
        .channels = mwifiex_channels_5ghz,
        .n_channels = ARRAY_SIZE(mwifiex_channels_5ghz),
        .bitrates = mwifiex_rates + 4,
        .n_bitrates = ARRAY_SIZE(mwifiex_rates) - 4,
};


/* Supported crypto cipher suits to be advertised to cfg80211 */
static const u32 mwifiex_cipher_suites[] = {
        WLAN_CIPHER_SUITE_WEP40,
        WLAN_CIPHER_SUITE_WEP104,
        WLAN_CIPHER_SUITE_TKIP,
        WLAN_CIPHER_SUITE_CCMP,
        WLAN_CIPHER_SUITE_SMS4,
        WLAN_CIPHER_SUITE_AES_CMAC,
};

/* Supported mgmt frame types to be advertised to cfg80211 */
static const struct ieee80211_txrx_stypes
mwifiex_mgmt_stypes[NUM_NL80211_IFTYPES] = {
        [NL80211_IFTYPE_STATION] = {
                .tx = BIT(IEEE80211_STYPE_ACTION >> 4) |
                      BIT(IEEE80211_STYPE_PROBE_RESP >> 4),
                .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
                      BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
        },
        [NL80211_IFTYPE_AP] = {
                .tx = BIT(IEEE80211_STYPE_ACTION >> 4) |
                      BIT(IEEE80211_STYPE_PROBE_RESP >> 4),
                .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
                      BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
        },
        [NL80211_IFTYPE_P2P_CLIENT] = {
                .tx = BIT(IEEE80211_STYPE_ACTION >> 4) |
                      BIT(IEEE80211_STYPE_PROBE_RESP >> 4),
                .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
                      BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
        },
        [NL80211_IFTYPE_P2P_GO] = {
                .tx = BIT(IEEE80211_STYPE_ACTION >> 4) |
                      BIT(IEEE80211_STYPE_PROBE_RESP >> 4),
                .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
                      BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
        },
};

/*
 * CFG802.11 operation handler for setting bit rates.
 *
 * Function configures data rates to firmware using bitrate mask
 * provided by cfg80211.
 */
static int mwifiex_cfg80211_set_bitrate_mask(struct wiphy *wiphy,
                                struct net_device *dev,
                                const u8 *peer,
                                const struct cfg80211_bitrate_mask *mask)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
        u16 bitmap_rates[MAX_BITMAP_RATES_SIZE];
        enum nl80211_band band;
        struct mwifiex_adapter *adapter = priv->adapter;

        if (!priv->media_connected) {
                mwifiex_dbg(adapter, ERROR,
                            "Can not set Tx data rate in disconnected state\n");
                return -EINVAL;
        }

        band = mwifiex_band_to_radio_type(priv->curr_bss_params.band);

        memset(bitmap_rates, 0, sizeof(bitmap_rates));

        /* Fill HR/DSSS rates. */
        if (band == NL80211_BAND_2GHZ)
                bitmap_rates[0] = mask->control[band].legacy & 0x000f;

        /* Fill OFDM rates */
        if (band == NL80211_BAND_2GHZ)
                bitmap_rates[1] = (mask->control[band].legacy & 0x0ff0) >> 4;
        else
                bitmap_rates[1] = mask->control[band].legacy;

        /* Fill HT MCS rates */
        bitmap_rates[2] = mask->control[band].ht_mcs[0];
        if (adapter->hw_dev_mcs_support == HT_STREAM_2X2)
                bitmap_rates[2] |= mask->control[band].ht_mcs[1] << 8;

       /* Fill VHT MCS rates */
        if (adapter->fw_api_ver == MWIFIEX_FW_V15) {
                bitmap_rates[10] = mask->control[band].vht_mcs[0];
                if (adapter->hw_dev_mcs_support == HT_STREAM_2X2)
                        bitmap_rates[11] = mask->control[band].vht_mcs[1];
        }

        return mwifiex_send_cmd(priv, HostCmd_CMD_TX_RATE_CFG,
                                HostCmd_ACT_GEN_SET, 0, bitmap_rates, true);
}

/*
 * CFG802.11 operation handler for connection quality monitoring.
 *
 * This function subscribes/unsubscribes HIGH_RSSI and LOW_RSSI
 * events to FW.
 */
static int mwifiex_cfg80211_set_cqm_rssi_config(struct wiphy *wiphy,
                                                struct net_device *dev,
                                                s32 rssi_thold, u32 rssi_hyst)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
        struct mwifiex_ds_misc_subsc_evt subsc_evt;

        priv->cqm_rssi_thold = rssi_thold;
        priv->cqm_rssi_hyst = rssi_hyst;

        memset(&subsc_evt, 0x00, sizeof(struct mwifiex_ds_misc_subsc_evt));
        subsc_evt.events = BITMASK_BCN_RSSI_LOW | BITMASK_BCN_RSSI_HIGH;

        /* Subscribe/unsubscribe low and high rssi events */
        if (rssi_thold && rssi_hyst) {
                subsc_evt.action = HostCmd_ACT_BITWISE_SET;
                subsc_evt.bcn_l_rssi_cfg.abs_value = abs(rssi_thold);
                subsc_evt.bcn_h_rssi_cfg.abs_value = abs(rssi_thold);
                subsc_evt.bcn_l_rssi_cfg.evt_freq = 1;
                subsc_evt.bcn_h_rssi_cfg.evt_freq = 1;
                return mwifiex_send_cmd(priv,
                                        HostCmd_CMD_802_11_SUBSCRIBE_EVENT,
                                        0, 0, &subsc_evt, true);
        } else {
                subsc_evt.action = HostCmd_ACT_BITWISE_CLR;
                return mwifiex_send_cmd(priv,
                                        HostCmd_CMD_802_11_SUBSCRIBE_EVENT,
                                        0, 0, &subsc_evt, true);
        }

        return 0;
}

/* cfg80211 operation handler for change_beacon.
 * Function retrieves and sets modified management IEs to FW.
 */
static int mwifiex_cfg80211_change_beacon(struct wiphy *wiphy,
                                          struct net_device *dev,
                                          struct cfg80211_beacon_data *data)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
        struct mwifiex_adapter *adapter = priv->adapter;

        mwifiex_cancel_scan(adapter);

        if (GET_BSS_ROLE(priv) != MWIFIEX_BSS_ROLE_UAP) {
                mwifiex_dbg(priv->adapter, ERROR,
                            "%s: bss_type mismatched\n", __func__);
                return -EINVAL;
        }

        if (!priv->bss_started) {
                mwifiex_dbg(priv->adapter, ERROR,
                            "%s: bss not started\n", __func__);
                return -EINVAL;
        }

        if (mwifiex_set_mgmt_ies(priv, data)) {
                mwifiex_dbg(priv->adapter, ERROR,
                            "%s: setting mgmt ies failed\n", __func__);
                return -EFAULT;
        }

        return 0;
}

/* cfg80211 operation handler for del_station.
 * Function deauthenticates station which value is provided in mac parameter.
 * If mac is NULL/broadcast, all stations in associated station list are
 * deauthenticated. If bss is not started or there are no stations in
 * associated stations list, no action is taken.
 */
static int
mwifiex_cfg80211_del_station(struct wiphy *wiphy, struct net_device *dev,
                             struct station_del_parameters *params)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
        struct mwifiex_sta_node *sta_node;
        u8 deauth_mac[ETH_ALEN];
        unsigned long flags;

        if (!priv->bss_started && priv->wdev.cac_started) {
                mwifiex_dbg(priv->adapter, INFO, "%s: abort CAC!\n", __func__);
                mwifiex_abort_cac(priv);
        }

        if (list_empty(&priv->sta_list) || !priv->bss_started)
                return 0;

        if (!params->mac || is_broadcast_ether_addr(params->mac))
                return 0;

        mwifiex_dbg(priv->adapter, INFO, "%s: mac address %pM\n",
                    __func__, params->mac);

        eth_zero_addr(deauth_mac);

        spin_lock_irqsave(&priv->sta_list_spinlock, flags);
        sta_node = mwifiex_get_sta_entry(priv, params->mac);
        if (sta_node)
                ether_addr_copy(deauth_mac, params->mac);
        spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);

        if (is_valid_ether_addr(deauth_mac)) {
                if (mwifiex_send_cmd(priv, HostCmd_CMD_UAP_STA_DEAUTH,
                                     HostCmd_ACT_GEN_SET, 0,
                                     deauth_mac, true))
                        return -1;
        }

        return 0;
}

static int
mwifiex_cfg80211_set_antenna(struct wiphy *wiphy, u32 tx_ant, u32 rx_ant)
{
        struct mwifiex_adapter *adapter = mwifiex_cfg80211_get_adapter(wiphy);
        struct mwifiex_private *priv = mwifiex_get_priv(adapter,
                                                        MWIFIEX_BSS_ROLE_ANY);
        struct mwifiex_ds_ant_cfg ant_cfg;

        if (!tx_ant || !rx_ant)
                return -EOPNOTSUPP;

        if (adapter->hw_dev_mcs_support != HT_STREAM_2X2) {
                /* Not a MIMO chip. User should provide specific antenna number
                 * for Tx/Rx path or enable all antennas for diversity
                 */
                if (tx_ant != rx_ant)
                        return -EOPNOTSUPP;

                if ((tx_ant & (tx_ant - 1)) &&
                    (tx_ant != BIT(adapter->number_of_antenna) - 1))
                        return -EOPNOTSUPP;

                if ((tx_ant == BIT(adapter->number_of_antenna) - 1) &&
                    (priv->adapter->number_of_antenna > 1)) {
                        tx_ant = RF_ANTENNA_AUTO;
                        rx_ant = RF_ANTENNA_AUTO;
                }
        } else {
                struct ieee80211_sta_ht_cap *ht_info;
                int rx_mcs_supp;
                enum nl80211_band band;

                if ((tx_ant == 0x1 && rx_ant == 0x1)) {
                        adapter->user_dev_mcs_support = HT_STREAM_1X1;
                        if (adapter->is_hw_11ac_capable)
                                adapter->usr_dot_11ac_mcs_support =
                                                MWIFIEX_11AC_MCS_MAP_1X1;
                } else {
                        adapter->user_dev_mcs_support = HT_STREAM_2X2;
                        if (adapter->is_hw_11ac_capable)
                                adapter->usr_dot_11ac_mcs_support =
                                                MWIFIEX_11AC_MCS_MAP_2X2;
                }

                for (band = 0; band < NUM_NL80211_BANDS; band++) {
                        if (!adapter->wiphy->bands[band])
                                continue;

                        ht_info = &adapter->wiphy->bands[band]->ht_cap;
                        rx_mcs_supp =
                                GET_RXMCSSUPP(adapter->user_dev_mcs_support);
                        memset(&ht_info->mcs, 0, adapter->number_of_antenna);
                        memset(&ht_info->mcs, 0xff, rx_mcs_supp);
                }
        }

        ant_cfg.tx_ant = tx_ant;
        ant_cfg.rx_ant = rx_ant;

        return mwifiex_send_cmd(priv, HostCmd_CMD_RF_ANTENNA,
                                HostCmd_ACT_GEN_SET, 0, &ant_cfg, true);
}

static int
mwifiex_cfg80211_get_antenna(struct wiphy *wiphy, u32 *tx_ant, u32 *rx_ant)
{
        struct mwifiex_adapter *adapter = mwifiex_cfg80211_get_adapter(wiphy);
        struct mwifiex_private *priv = mwifiex_get_priv(adapter,
                                                        MWIFIEX_BSS_ROLE_ANY);
        mwifiex_send_cmd(priv, HostCmd_CMD_RF_ANTENNA,
                         HostCmd_ACT_GEN_GET, 0, NULL, true);

        *tx_ant = priv->tx_ant;
        *rx_ant = priv->rx_ant;

        return 0;
}

/* cfg80211 operation handler for stop ap.
 * Function stops BSS running at uAP interface.
 */
static int mwifiex_cfg80211_stop_ap(struct wiphy *wiphy, struct net_device *dev)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);

        mwifiex_abort_cac(priv);

        if (mwifiex_del_mgmt_ies(priv))
                mwifiex_dbg(priv->adapter, ERROR,
                            "Failed to delete mgmt IEs!\n");

        priv->ap_11n_enabled = 0;
        memset(&priv->bss_cfg, 0, sizeof(priv->bss_cfg));

        if (mwifiex_send_cmd(priv, HostCmd_CMD_UAP_BSS_STOP,
                             HostCmd_ACT_GEN_SET, 0, NULL, true)) {
                mwifiex_dbg(priv->adapter, ERROR,
                            "Failed to stop the BSS\n");
                return -1;
        }

        if (mwifiex_send_cmd(priv, HOST_CMD_APCMD_SYS_RESET,
                             HostCmd_ACT_GEN_SET, 0, NULL, true)) {
                mwifiex_dbg(priv->adapter, ERROR,
                            "Failed to reset BSS\n");
                return -1;
        }

        if (netif_carrier_ok(priv->netdev))
                netif_carrier_off(priv->netdev);
        mwifiex_stop_net_dev_queue(priv->netdev, priv->adapter);

        return 0;
}

/* cfg80211 operation handler for start_ap.
 * Function sets beacon period, DTIM period, SSID and security into
 * AP config structure.
 * AP is configured with these settings and BSS is started.
 */
static int mwifiex_cfg80211_start_ap(struct wiphy *wiphy,
                                     struct net_device *dev,
                                     struct cfg80211_ap_settings *params)
{
        struct mwifiex_uap_bss_param *bss_cfg;
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);

        if (GET_BSS_ROLE(priv) != MWIFIEX_BSS_ROLE_UAP)
                return -1;

        bss_cfg = kzalloc(sizeof(struct mwifiex_uap_bss_param), GFP_KERNEL);
        if (!bss_cfg)
                return -ENOMEM;

        mwifiex_set_sys_config_invalid_data(bss_cfg);

        if (params->beacon_interval)
                bss_cfg->beacon_period = params->beacon_interval;
        if (params->dtim_period)
                bss_cfg->dtim_period = params->dtim_period;

        if (params->ssid && params->ssid_len) {
                memcpy(bss_cfg->ssid.ssid, params->ssid, params->ssid_len);
                bss_cfg->ssid.ssid_len = params->ssid_len;
        }
        if (params->inactivity_timeout > 0) {
                /* sta_ao_timer/ps_sta_ao_timer is in unit of 100ms */
                bss_cfg->sta_ao_timer = 10 * params->inactivity_timeout;
                bss_cfg->ps_sta_ao_timer = 10 * params->inactivity_timeout;
        }

        switch (params->hidden_ssid) {
        case NL80211_HIDDEN_SSID_NOT_IN_USE:
                bss_cfg->bcast_ssid_ctl = 1;
                break;
        case NL80211_HIDDEN_SSID_ZERO_LEN:
                bss_cfg->bcast_ssid_ctl = 0;
                break;
        case NL80211_HIDDEN_SSID_ZERO_CONTENTS:
                /* firmware doesn't support this type of hidden SSID */
        default:
                kfree(bss_cfg);
                return -EINVAL;
        }

        mwifiex_uap_set_channel(priv, bss_cfg, params->chandef);
        mwifiex_set_uap_rates(bss_cfg, params);

        if (mwifiex_set_secure_params(priv, bss_cfg, params)) {
                mwifiex_dbg(priv->adapter, ERROR,
                            "Failed to parse security parameters!\n");
                goto out;
        }

        mwifiex_set_ht_params(priv, bss_cfg, params);

        if (priv->adapter->is_hw_11ac_capable) {
                mwifiex_set_vht_params(priv, bss_cfg, params);
                mwifiex_set_vht_width(priv, params->chandef.width,
                                      priv->ap_11ac_enabled);
        }

        if (priv->ap_11ac_enabled)
                mwifiex_set_11ac_ba_params(priv);
        else
                mwifiex_set_ba_params(priv);

        mwifiex_set_wmm_params(priv, bss_cfg, params);

        if (mwifiex_is_11h_active(priv))
                mwifiex_set_tpc_params(priv, bss_cfg, params);

        if (mwifiex_is_11h_active(priv) &&
            !cfg80211_chandef_dfs_required(wiphy, &params->chandef,
                                           priv->bss_mode)) {
                mwifiex_dbg(priv->adapter, INFO,
                            "Disable 11h extensions in FW\n");
                if (mwifiex_11h_activate(priv, false)) {
                        mwifiex_dbg(priv->adapter, ERROR,
                                    "Failed to disable 11h extensions!!");
                        goto out;
                }
                priv->state_11h.is_11h_active = false;
        }

        mwifiex_config_uap_11d(priv, &params->beacon);

        if (mwifiex_config_start_uap(priv, bss_cfg)) {
                mwifiex_dbg(priv->adapter, ERROR,
                            "Failed to start AP\n");
                goto out;
        }

        if (mwifiex_set_mgmt_ies(priv, &params->beacon))
                goto out;

        if (!netif_carrier_ok(priv->netdev))
                netif_carrier_on(priv->netdev);
        mwifiex_wake_up_net_dev_queue(priv->netdev, priv->adapter);

        memcpy(&priv->bss_cfg, bss_cfg, sizeof(priv->bss_cfg));
        kfree(bss_cfg);
        return 0;

out:
        kfree(bss_cfg);
        return -1;
}

/*
 * CFG802.11 operation handler for disconnection request.
 *
 * This function does not work when there is already a disconnection
 * procedure going on.
 */
static int
mwifiex_cfg80211_disconnect(struct wiphy *wiphy, struct net_device *dev,
                            u16 reason_code)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);

        if (!mwifiex_stop_bg_scan(priv))
                cfg80211_sched_scan_stopped_rtnl(priv->wdev.wiphy, 0);

        if (mwifiex_deauthenticate(priv, NULL))
                return -EFAULT;

        eth_zero_addr(priv->cfg_bssid);
        priv->hs2_enabled = false;

        return 0;
}

/*
 * This function informs the CFG802.11 subsystem of a new IBSS.
 *
 * The following information are sent to the CFG802.11 subsystem
 * to register the new IBSS. If we do not register the new IBSS,
 * a kernel panic will result.
 *      - SSID
 *      - SSID length
 *      - BSSID
 *      - Channel
 */
static int mwifiex_cfg80211_inform_ibss_bss(struct mwifiex_private *priv)
{
        struct ieee80211_channel *chan;
        struct mwifiex_bss_info bss_info;
        struct cfg80211_bss *bss;
        int ie_len;
        u8 ie_buf[IEEE80211_MAX_SSID_LEN + sizeof(struct ieee_types_header)];
        enum nl80211_band band;

        if (mwifiex_get_bss_info(priv, &bss_info))
                return -1;

        ie_buf[0] = WLAN_EID_SSID;
        ie_buf[1] = bss_info.ssid.ssid_len;

        memcpy(&ie_buf[sizeof(struct ieee_types_header)],
               &bss_info.ssid.ssid, bss_info.ssid.ssid_len);
        ie_len = ie_buf[1] + sizeof(struct ieee_types_header);

        band = mwifiex_band_to_radio_type(priv->curr_bss_params.band);
        chan = ieee80211_get_channel(priv->wdev.wiphy,
                        ieee80211_channel_to_frequency(bss_info.bss_chan,
                                                       band));

        bss = cfg80211_inform_bss(priv->wdev.wiphy, chan,
                                  CFG80211_BSS_FTYPE_UNKNOWN,
                                  bss_info.bssid, 0, WLAN_CAPABILITY_IBSS,
                                  0, ie_buf, ie_len, 0, GFP_KERNEL);
        if (bss) {
                cfg80211_put_bss(priv->wdev.wiphy, bss);
                ether_addr_copy(priv->cfg_bssid, bss_info.bssid);
        }

        return 0;
}

/*
 * This function connects with a BSS.
 *
 * This function handles both Infra and Ad-Hoc modes. It also performs
 * validity checking on the provided parameters, disconnects from the
 * current BSS (if any), sets up the association/scan parameters,
 * including security settings, and performs specific SSID scan before
 * trying to connect.
 *
 * For Infra mode, the function returns failure if the specified SSID
 * is not found in scan table. However, for Ad-Hoc mode, it can create
 * the IBSS if it does not exist. On successful completion in either case,
 * the function notifies the CFG802.11 subsystem of the new BSS connection.
 */
static int
mwifiex_cfg80211_assoc(struct mwifiex_private *priv, size_t ssid_len,
                       const u8 *ssid, const u8 *bssid, int mode,
                       struct ieee80211_channel *channel,
                       struct cfg80211_connect_params *sme, bool privacy)
{
        struct cfg80211_ssid req_ssid;
        int ret, auth_type = 0;
        struct cfg80211_bss *bss = NULL;
        u8 is_scanning_required = 0;

        memset(&req_ssid, 0, sizeof(struct cfg80211_ssid));

        req_ssid.ssid_len = ssid_len;
        if (ssid_len > IEEE80211_MAX_SSID_LEN) {
                mwifiex_dbg(priv->adapter, ERROR, "invalid SSID - aborting\n");
                return -EINVAL;
        }

        memcpy(req_ssid.ssid, ssid, ssid_len);
        if (!req_ssid.ssid_len || req_ssid.ssid[0] < 0x20) {
                mwifiex_dbg(priv->adapter, ERROR, "invalid SSID - aborting\n");
                return -EINVAL;
        }

        /* As this is new association, clear locally stored
         * keys and security related flags */
        priv->sec_info.wpa_enabled = false;
        priv->sec_info.wpa2_enabled = false;
        priv->wep_key_curr_index = 0;
        priv->sec_info.encryption_mode = 0;
        priv->sec_info.is_authtype_auto = 0;
        ret = mwifiex_set_encode(priv, NULL, NULL, 0, 0, NULL, 1);

        if (mode == NL80211_IFTYPE_ADHOC) {
                u16 enable = true;

                /* set ibss coalescing_status */
                ret = mwifiex_send_cmd(
                                priv,
                                HostCmd_CMD_802_11_IBSS_COALESCING_STATUS,
                                HostCmd_ACT_GEN_SET, 0, &enable, true);
                if (ret)
                        return ret;

                /* "privacy" is set only for ad-hoc mode */
                if (privacy) {
                        /*
                         * Keep WLAN_CIPHER_SUITE_WEP104 for now so that
                         * the firmware can find a matching network from the
                         * scan. The cfg80211 does not give us the encryption
                         * mode at this stage so just setting it to WEP here.
                         */
                        priv->sec_info.encryption_mode =
                                        WLAN_CIPHER_SUITE_WEP104;
                        priv->sec_info.authentication_mode =
                                        NL80211_AUTHTYPE_OPEN_SYSTEM;
                }

                goto done;
        }

        /* Now handle infra mode. "sme" is valid for infra mode only */
        if (sme->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
                auth_type = NL80211_AUTHTYPE_OPEN_SYSTEM;
                priv->sec_info.is_authtype_auto = 1;
        } else {
                auth_type = sme->auth_type;
        }

        if (sme->crypto.n_ciphers_pairwise) {
                priv->sec_info.encryption_mode =
                                                sme->crypto.ciphers_pairwise[0];
                priv->sec_info.authentication_mode = auth_type;
        }

        if (sme->crypto.cipher_group) {
                priv->sec_info.encryption_mode = sme->crypto.cipher_group;
                priv->sec_info.authentication_mode = auth_type;
        }
        if (sme->ie)
                ret = mwifiex_set_gen_ie(priv, sme->ie, sme->ie_len);

        if (sme->key) {
                if (mwifiex_is_alg_wep(priv->sec_info.encryption_mode)) {
                        mwifiex_dbg(priv->adapter, INFO,
                                    "info: setting wep encryption\t"
                                    "with key len %d\n", sme->key_len);
                        priv->wep_key_curr_index = sme->key_idx;
                        ret = mwifiex_set_encode(priv, NULL, sme->key,
                                                 sme->key_len, sme->key_idx,
                                                 NULL, 0);
                }
        }
done:
        /*
         * Scan entries are valid for some time (15 sec). So we can save one
         * active scan time if we just try cfg80211_get_bss first. If it fails
         * then request scan and cfg80211_get_bss() again for final output.
         */
        while (1) {
                if (is_scanning_required) {
                        /* Do specific SSID scanning */
                        if (mwifiex_request_scan(priv, &req_ssid)) {
                                mwifiex_dbg(priv->adapter, ERROR, "scan error\n");
                                return -EFAULT;
                        }
                }

                /* Find the BSS we want using available scan results */
                if (mode == NL80211_IFTYPE_ADHOC)
                        bss = cfg80211_get_bss(priv->wdev.wiphy, channel,
                                               bssid, ssid, ssid_len,
                                               IEEE80211_BSS_TYPE_IBSS,
                                               IEEE80211_PRIVACY_ANY);
                else
                        bss = cfg80211_get_bss(priv->wdev.wiphy, channel,
                                               bssid, ssid, ssid_len,
                                               IEEE80211_BSS_TYPE_ESS,
                                               IEEE80211_PRIVACY_ANY);

                if (!bss) {
                        if (is_scanning_required) {
                                mwifiex_dbg(priv->adapter, WARN,
                                            "assoc: requested bss not found in scan results\n");
                                break;
                        }
                        is_scanning_required = 1;
                } else {
                        mwifiex_dbg(priv->adapter, MSG,
                                    "info: trying to associate to '%.*s' bssid %pM\n",
                                    req_ssid.ssid_len, (char *)req_ssid.ssid,
                                    bss->bssid);
                        memcpy(&priv->cfg_bssid, bss->bssid, ETH_ALEN);
                        break;
                }
        }

        ret = mwifiex_bss_start(priv, bss, &req_ssid);
        if (ret)
                return ret;

        if (mode == NL80211_IFTYPE_ADHOC) {
                /* Inform the BSS information to kernel, otherwise
                 * kernel will give a panic after successful assoc */
                if (mwifiex_cfg80211_inform_ibss_bss(priv))
                        return -EFAULT;
        }

        return ret;
}

/*
 * CFG802.11 operation handler for association request.
 *
 * This function does not work when the current mode is set to Ad-Hoc, or
 * when there is already an association procedure going on. The given BSS
 * information is used to associate.
 */
static int
mwifiex_cfg80211_connect(struct wiphy *wiphy, struct net_device *dev,
                         struct cfg80211_connect_params *sme)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
        struct mwifiex_adapter *adapter = priv->adapter;
        int ret;

        if (GET_BSS_ROLE(priv) != MWIFIEX_BSS_ROLE_STA) {
                mwifiex_dbg(adapter, ERROR,
                            "%s: reject infra assoc request in non-STA role\n",
                            dev->name);
                return -EINVAL;
        }

        if (priv->wdev.current_bss) {
                mwifiex_dbg(adapter, ERROR,
                            "%s: already connected\n", dev->name);
                return -EALREADY;
        }

        if (priv->scan_block)
                priv->scan_block = false;

        if (adapter->surprise_removed || adapter->is_cmd_timedout) {
                mwifiex_dbg(adapter, ERROR,
                            "%s: Ignore connection.\t"
                            "Card removed or FW in bad state\n",
                            dev->name);
                return -EFAULT;
        }

        mwifiex_dbg(adapter, INFO,
                    "info: Trying to associate to %.*s and bssid %pM\n",
                    (int)sme->ssid_len, (char *)sme->ssid, sme->bssid);

        if (!mwifiex_stop_bg_scan(priv))
                cfg80211_sched_scan_stopped_rtnl(priv->wdev.wiphy, 0);

        ret = mwifiex_cfg80211_assoc(priv, sme->ssid_len, sme->ssid, sme->bssid,
                                     priv->bss_mode, sme->channel, sme, 0);
        if (!ret) {
                cfg80211_connect_result(priv->netdev, priv->cfg_bssid, NULL, 0,
                                        NULL, 0, WLAN_STATUS_SUCCESS,
                                        GFP_KERNEL);
                mwifiex_dbg(priv->adapter, MSG,
                            "info: associated to bssid %pM successfully\n",
                            priv->cfg_bssid);
                if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
                    priv->adapter->auto_tdls &&
                    priv->bss_type == MWIFIEX_BSS_TYPE_STA)
                        mwifiex_setup_auto_tdls_timer(priv);
        } else {
                mwifiex_dbg(priv->adapter, ERROR,
                            "info: association to bssid %pM failed\n",
                            priv->cfg_bssid);
                eth_zero_addr(priv->cfg_bssid);

                if (ret > 0)
                        cfg80211_connect_result(priv->netdev, priv->cfg_bssid,
                                                NULL, 0, NULL, 0, ret,
                                                GFP_KERNEL);
                else
                        cfg80211_connect_result(priv->netdev, priv->cfg_bssid,
                                                NULL, 0, NULL, 0,
                                                WLAN_STATUS_UNSPECIFIED_FAILURE,
                                                GFP_KERNEL);
        }

        return 0;
}

/*
 * This function sets following parameters for ibss network.
 *  -  channel
 *  -  start band
 *  -  11n flag
 *  -  secondary channel offset
 */
static int mwifiex_set_ibss_params(struct mwifiex_private *priv,
                                   struct cfg80211_ibss_params *params)
{
        struct mwifiex_adapter *adapter = priv->adapter;
        int index = 0, i;
        u8 config_bands = 0;

        if (params->chandef.chan->band == NL80211_BAND_2GHZ) {
                if (!params->basic_rates) {
                        config_bands = BAND_B | BAND_G;
                } else {
                        for (i = 0; i < mwifiex_band_2ghz.n_bitrates; i++) {
                                /*
                                 * Rates below 6 Mbps in the table are CCK
                                 * rates; 802.11b and from 6 they are OFDM;
                                 * 802.11G
                                 */
                                if (mwifiex_rates[i].bitrate == 60) {
                                        index = 1 << i;
                                        break;
                                }
                        }

                        if (params->basic_rates < index) {
                                config_bands = BAND_B;
                        } else {
                                config_bands = BAND_G;
                                if (params->basic_rates % index)
                                        config_bands |= BAND_B;
                        }
                }

                if (cfg80211_get_chandef_type(&params->chandef) !=
                                                NL80211_CHAN_NO_HT)
                        config_bands |= BAND_G | BAND_GN;
        } else {
                if (cfg80211_get_chandef_type(&params->chandef) ==
                                                NL80211_CHAN_NO_HT)
                        config_bands = BAND_A;
                else
                        config_bands = BAND_AN | BAND_A;
        }

        if (!((config_bands | adapter->fw_bands) & ~adapter->fw_bands)) {
                adapter->config_bands = config_bands;
                adapter->adhoc_start_band = config_bands;

                if ((config_bands & BAND_GN) || (config_bands & BAND_AN))
                        adapter->adhoc_11n_enabled = true;
                else
                        adapter->adhoc_11n_enabled = false;
        }

        adapter->sec_chan_offset =
                mwifiex_chan_type_to_sec_chan_offset(
                        cfg80211_get_chandef_type(&params->chandef));
        priv->adhoc_channel = ieee80211_frequency_to_channel(
                                params->chandef.chan->center_freq);

        mwifiex_dbg(adapter, INFO,
                    "info: set ibss band %d, chan %d, chan offset %d\n",
                    config_bands, priv->adhoc_channel,
                    adapter->sec_chan_offset);

        return 0;
}

/*
 * CFG802.11 operation handler to join an IBSS.
 *
 * This function does not work in any mode other than Ad-Hoc, or if
 * a join operation is already in progress.
 */
static int
mwifiex_cfg80211_join_ibss(struct wiphy *wiphy, struct net_device *dev,
                           struct cfg80211_ibss_params *params)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
        int ret = 0;

        if (priv->bss_mode != NL80211_IFTYPE_ADHOC) {
                mwifiex_dbg(priv->adapter, ERROR,
                            "request to join ibss received\t"
                            "when station is not in ibss mode\n");
                goto done;
        }

        mwifiex_dbg(priv->adapter, MSG,
                    "info: trying to join to %.*s and bssid %pM\n",
                    params->ssid_len, (char *)params->ssid, params->bssid);

        mwifiex_set_ibss_params(priv, params);

        ret = mwifiex_cfg80211_assoc(priv, params->ssid_len, params->ssid,
                                     params->bssid, priv->bss_mode,
                                     params->chandef.chan, NULL,
                                     params->privacy);
done:
        if (!ret) {
                cfg80211_ibss_joined(priv->netdev, priv->cfg_bssid,
                                     params->chandef.chan, GFP_KERNEL);
                mwifiex_dbg(priv->adapter, MSG,
                            "info: joined/created adhoc network with bssid\t"
                            "%pM successfully\n", priv->cfg_bssid);
        } else {
                mwifiex_dbg(priv->adapter, ERROR,
                            "info: failed creating/joining adhoc network\n");
        }

        return ret;
}

/*
 * CFG802.11 operation handler to leave an IBSS.
 *
 * This function does not work if a leave operation is
 * already in progress.
 */
static int
mwifiex_cfg80211_leave_ibss(struct wiphy *wiphy, struct net_device *dev)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);

        mwifiex_dbg(priv->adapter, MSG, "info: disconnecting from essid %pM\n",
                    priv->cfg_bssid);
        if (mwifiex_deauthenticate(priv, NULL))
                return -EFAULT;

        eth_zero_addr(priv->cfg_bssid);

        return 0;
}

/*
 * CFG802.11 operation handler for scan request.
 *
 * This function issues a scan request to the firmware based upon
 * the user specified scan configuration. On successful completion,
 * it also informs the results.
 */
static int
mwifiex_cfg80211_scan(struct wiphy *wiphy,
                      struct cfg80211_scan_request *request)
{
        struct net_device *dev = request->wdev->netdev;
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
        int i, offset, ret;
        struct ieee80211_channel *chan;
        struct ieee_types_header *ie;
        struct mwifiex_user_scan_cfg *user_scan_cfg;
        u8 mac_addr[ETH_ALEN];

        mwifiex_dbg(priv->adapter, CMD,
                    "info: received scan request on %s\n", dev->name);

        /* Block scan request if scan operation or scan cleanup when interface
         * is disabled is in process
         */
        if (priv->scan_request || priv->scan_aborting) {
                mwifiex_dbg(priv->adapter, WARN,
                            "cmd: Scan already in process..\n");
                return -EBUSY;
        }

        if (!priv->wdev.current_bss && priv->scan_block)
                priv->scan_block = false;

        if (!mwifiex_stop_bg_scan(priv))
                cfg80211_sched_scan_stopped_rtnl(priv->wdev.wiphy, 0);

        user_scan_cfg = kzalloc(sizeof(*user_scan_cfg), GFP_KERNEL);
        if (!user_scan_cfg)
                return -ENOMEM;

        priv->scan_request = request;

        if (request->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) {
                get_random_mask_addr(mac_addr, request->mac_addr,
                                     request->mac_addr_mask);
                ether_addr_copy(request->mac_addr, mac_addr);
                ether_addr_copy(user_scan_cfg->random_mac, mac_addr);
        }

        user_scan_cfg->num_ssids = request->n_ssids;
        user_scan_cfg->ssid_list = request->ssids;

        if (request->ie && request->ie_len) {
                offset = 0;
                for (i = 0; i < MWIFIEX_MAX_VSIE_NUM; i++) {
                        if (priv->vs_ie[i].mask != MWIFIEX_VSIE_MASK_CLEAR)
                                continue;
                        priv->vs_ie[i].mask = MWIFIEX_VSIE_MASK_SCAN;
                        ie = (struct ieee_types_header *)(request->ie + offset);
                        memcpy(&priv->vs_ie[i].ie, ie, sizeof(*ie) + ie->len);
                        offset += sizeof(*ie) + ie->len;

                        if (offset >= request->ie_len)
                                break;
                }
        }

        for (i = 0; i < min_t(u32, request->n_channels,
                              MWIFIEX_USER_SCAN_CHAN_MAX); i++) {
                chan = request->channels[i];
                user_scan_cfg->chan_list[i].chan_number = chan->hw_value;
                user_scan_cfg->chan_list[i].radio_type = chan->band;

                if ((chan->flags & IEEE80211_CHAN_NO_IR) || !request->n_ssids)
                        user_scan_cfg->chan_list[i].scan_type =
                                                MWIFIEX_SCAN_TYPE_PASSIVE;
                else
                        user_scan_cfg->chan_list[i].scan_type =
                                                MWIFIEX_SCAN_TYPE_ACTIVE;

                user_scan_cfg->chan_list[i].scan_time = 0;
        }

        if (priv->adapter->scan_chan_gap_enabled &&
            mwifiex_is_any_intf_active(priv))
                user_scan_cfg->scan_chan_gap =
                                              priv->adapter->scan_chan_gap_time;

        ret = mwifiex_scan_networks(priv, user_scan_cfg);
        kfree(user_scan_cfg);
        if (ret) {
                mwifiex_dbg(priv->adapter, ERROR,
                            "scan failed: %d\n", ret);
                priv->scan_aborting = false;
                priv->scan_request = NULL;
                return ret;
        }

        if (request->ie && request->ie_len) {
                for (i = 0; i < MWIFIEX_MAX_VSIE_NUM; i++) {
                        if (priv->vs_ie[i].mask == MWIFIEX_VSIE_MASK_SCAN) {
                                priv->vs_ie[i].mask = MWIFIEX_VSIE_MASK_CLEAR;
                                memset(&priv->vs_ie[i].ie, 0,
                                       MWIFIEX_MAX_VSIE_LEN);
                        }
                }
        }
        return 0;
}

/* CFG802.11 operation handler for sched_scan_start.
 *
 * This function issues a bgscan config request to the firmware based upon
 * the user specified sched_scan configuration. On successful completion,
 * firmware will generate BGSCAN_REPORT event, driver should issue bgscan
 * query command to get sched_scan results from firmware.
 */
static int
mwifiex_cfg80211_sched_scan_start(struct wiphy *wiphy,
                                  struct net_device *dev,
                                  struct cfg80211_sched_scan_request *request)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
        int i, offset;
        struct ieee80211_channel *chan;
        struct mwifiex_bg_scan_cfg *bgscan_cfg;
        struct ieee_types_header *ie;

        if (!request || (!request->n_ssids && !request->n_match_sets)) {
                wiphy_err(wiphy, "%s : Invalid Sched_scan parameters",
                          __func__);
                return -EINVAL;
        }

        wiphy_info(wiphy, "sched_scan start : n_ssids=%d n_match_sets=%d ",
                   request->n_ssids, request->n_match_sets);
        wiphy_info(wiphy, "n_channels=%d interval=%d ie_len=%d\n",
                   request->n_channels, request->scan_plans->interval,
                   (int)request->ie_len);

        bgscan_cfg = kzalloc(sizeof(*bgscan_cfg), GFP_KERNEL);
        if (!bgscan_cfg)
                return -ENOMEM;

        if (priv->scan_request || priv->scan_aborting)
                bgscan_cfg->start_later = true;

        bgscan_cfg->num_ssids = request->n_match_sets;
        bgscan_cfg->ssid_list = request->match_sets;

        if (request->ie && request->ie_len) {
                offset = 0;
                for (i = 0; i < MWIFIEX_MAX_VSIE_NUM; i++) {
                        if (priv->vs_ie[i].mask != MWIFIEX_VSIE_MASK_CLEAR)
                                continue;
                        priv->vs_ie[i].mask = MWIFIEX_VSIE_MASK_BGSCAN;
                        ie = (struct ieee_types_header *)(request->ie + offset);
                        memcpy(&priv->vs_ie[i].ie, ie, sizeof(*ie) + ie->len);
                        offset += sizeof(*ie) + ie->len;

                        if (offset >= request->ie_len)
                                break;
                }
        }

        for (i = 0; i < min_t(u32, request->n_channels,
                              MWIFIEX_BG_SCAN_CHAN_MAX); i++) {
                chan = request->channels[i];
                bgscan_cfg->chan_list[i].chan_number = chan->hw_value;
                bgscan_cfg->chan_list[i].radio_type = chan->band;

                if ((chan->flags & IEEE80211_CHAN_NO_IR) || !request->n_ssids)
                        bgscan_cfg->chan_list[i].scan_type =
                                                MWIFIEX_SCAN_TYPE_PASSIVE;
                else
                        bgscan_cfg->chan_list[i].scan_type =
                                                MWIFIEX_SCAN_TYPE_ACTIVE;

                bgscan_cfg->chan_list[i].scan_time = 0;
        }

        bgscan_cfg->chan_per_scan = min_t(u32, request->n_channels,
                                          MWIFIEX_BG_SCAN_CHAN_MAX);

        /* Use at least 15 second for per scan cycle */
        bgscan_cfg->scan_interval = (request->scan_plans->interval >
                                     MWIFIEX_BGSCAN_INTERVAL) ?
                                request->scan_plans->interval :
                                MWIFIEX_BGSCAN_INTERVAL;

        bgscan_cfg->repeat_count = MWIFIEX_BGSCAN_REPEAT_COUNT;
        bgscan_cfg->report_condition = MWIFIEX_BGSCAN_SSID_MATCH |
                                MWIFIEX_BGSCAN_WAIT_ALL_CHAN_DONE;
        bgscan_cfg->bss_type = MWIFIEX_BSS_MODE_INFRA;
        bgscan_cfg->action = MWIFIEX_BGSCAN_ACT_SET;
        bgscan_cfg->enable = true;
        if (request->min_rssi_thold != NL80211_SCAN_RSSI_THOLD_OFF) {
                bgscan_cfg->report_condition |= MWIFIEX_BGSCAN_SSID_RSSI_MATCH;
                bgscan_cfg->rssi_threshold = request->min_rssi_thold;
        }

        if (mwifiex_send_cmd(priv, HostCmd_CMD_802_11_BG_SCAN_CONFIG,
                             HostCmd_ACT_GEN_SET, 0, bgscan_cfg, true)) {
                kfree(bgscan_cfg);
                return -EFAULT;
        }

        priv->sched_scanning = true;

        kfree(bgscan_cfg);
        return 0;
}

/* CFG802.11 operation handler for sched_scan_stop.
 *
 * This function issues a bgscan config command to disable
 * previous bgscan configuration in the firmware
 */
static int mwifiex_cfg80211_sched_scan_stop(struct wiphy *wiphy,
                                            struct net_device *dev, u64 reqid)
{
        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);

        wiphy_info(wiphy, "sched scan stop!");
        mwifiex_stop_bg_scan(priv);

        return 0;
}

static void mwifiex_setup_vht_caps(struct ieee80211_sta_vht_cap *vht_info,
                                   struct mwifiex_private *priv)
{
        struct mwifiex_adapter *adapter = priv->adapter;

        vht_info->vht_supported = true;

        vht_info->cap = adapter->hw_dot_11ac_dev_cap;
        /* Update MCS support for VHT */
        vht_info->vht_mcs.rx_mcs_map = cpu_to_le16(
                                adapter->hw_dot_11ac_mcs_support & 0xFFFF);
        vht_info->vht_mcs.rx_highest = 0;
        vht_info->vht_mcs.tx_mcs_map = cpu_to_le16(
                                adapter->hw_dot_11ac_mcs_support >> 16);
        vht_info->vht_mcs.tx_highest = 0;
}

/*
 * This function sets up the CFG802.11 specific HT capability fields
 * with default values.
 *
 * The following default values are set -
 *      - HT Supported = True
 *      - Maximum AMPDU length factor = IEEE80211_HT_MAX_AMPDU_64K
 *      - Minimum AMPDU spacing = IEEE80211_HT_MPDU_DENSITY_NONE
 *      - HT Capabilities supported by firmware
 *      - MCS information, Rx mask = 0xff
 *      - MCD information, Tx parameters = IEEE80211_HT_MCS_TX_DEFINED (0x01)
 */
static void
mwifiex_setup_ht_caps(struct ieee80211_sta_ht_cap *ht_info,
                      struct mwifiex_private *priv)
{
        int rx_mcs_supp;
        struct ieee80211_mcs_info mcs_set;
        u8 *mcs = (u8 *)&mcs_set;
        struct mwifiex_adapter *adapter = priv->adapter;

        ht_info->ht_supported = true;
        ht_info->ampdu_factor = IEEE80211_HT_MAX_AMPDU_64K;
        ht_info->ampdu_density = IEEE80211_HT_MPDU_DENSITY_NONE;

        memset(&ht_info->mcs, 0, sizeof(ht_info->mcs));

        /* Fill HT capability information */
        if (ISSUPP_CHANWIDTH40(adapter->hw_dot_11n_dev_cap))
                ht_info->cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
        else
                ht_info->cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;

        if (ISSUPP_SHORTGI20(adapter->hw_dot_11n_dev_cap))
                ht_info->cap |= IEEE80211_HT_CAP_SGI_20;
        else
                ht_info->cap &= ~IEEE80211_HT_CAP_SGI_20;

        if (ISSUPP_SHORTGI40(adapter->hw_dot_11n_dev_cap))
                ht_info->cap |= IEEE80211_HT_CAP_SGI_40;
        else
                ht_info->cap &= ~IEEE80211_HT_CAP_SGI_40;

        if (adapter->user_dev_mcs_support == HT_STREAM_2X2)
                ht_info->cap |= 2 << IEEE80211_HT_CAP_RX_STBC_SHIFT;
        else
                ht_info->cap |= 1 << IEEE80211_HT_CAP_RX_STBC_SHIFT;

        if (ISSUPP_TXSTBC(adapter->hw_dot_11n_dev_cap))
                ht_info->cap |= IEEE80211_HT_CAP_TX_STBC;
        else
                ht_info->cap &= ~IEEE80211_HT_CAP_TX_STBC;

        if (ISSUPP_GREENFIELD(adapter->hw_dot_11n_dev_cap))
                ht_info->cap |= IEEE80211_HT_CAP_GRN_FLD;
        else
                ht_info->cap &= ~IEEE80211_HT_CAP_GRN_FLD;

        if (ISENABLED_40MHZ_INTOLERANT(adapter->hw_dot_11n_dev_cap))
                ht_info->cap |= IEEE80211_HT_CAP_40MHZ_INTOLERANT;
        else
                ht_info->cap &= ~IEEE80211_HT_CAP_40MHZ_INTOLERANT;

        if (ISSUPP_RXLDPC(adapter->hw_dot_11n_dev_cap))
                ht_info->cap |= IEEE80211_HT_CAP_LDPC_CODING;
        else
                ht_info->cap &= ~IEEE80211_HT_CAP_LDPC_CODING;

        ht_info->cap &= ~IEEE80211_HT_CAP_MAX_AMSDU;
        ht_info->cap |= IEEE80211_HT_CAP_SM_PS;

        rx_mcs_supp = GET_RXMCSSUPP(adapter->user_dev_mcs_support);
        /* Set MCS for 1x1/2x2 */
        memset(mcs, 0xff, rx_mcs_supp);
        /* Clear all the other values */
        memset(&mcs[rx_mcs_supp], 0,
               sizeof(struct ieee80211_mcs_info) - rx_mcs_supp);
        if (priv->bss_mode == NL80211_IFTYPE_STATION ||
            ISSUPP_CHANWIDTH40(adapter->hw_dot_11n_dev_cap))
                /* Set MCS32 for infra mode or ad-hoc mode with 40MHz support */
                SETHT_MCS32(mcs_set.rx_mask);

        memcpy((u8 *) &ht_info->mcs, mcs, sizeof(struct ieee80211_mcs_info));

        ht_info->mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;
}

/*
 *  create a new virtual interface with the given name and name assign type
 */
struct wireless_dev *mwifiex_add_virtual_intf(struct wiphy *wiphy,
                                              const char *name,
                                              unsigned char name_assign_type,
                                              enum nl80211_iftype type,
                                              struct vif_params *params)
{
        struct mwifiex_adapter *adapter = mwifiex_cfg80211_get_adapter(wiphy);
        struct mwifiex_private *priv;
        struct net_device *dev;
        void *mdev_priv;
        int ret;

        if (!adapter)
                return ERR_PTR(-EFAULT);

        switch (type) {
        case NL80211_IFTYPE_UNSPECIFIED:
        case NL80211_IFTYPE_STATION:
        case NL80211_IFTYPE_ADHOC:
                if (adapter->curr_iface_comb.sta_intf ==
                    adapter->iface_limit.sta_intf) {
                        mwifiex_dbg(adapter, ERROR,
                                    "cannot create multiple sta/adhoc ifaces\n");
                        return ERR_PTR(-EINVAL);
                }

                priv = mwifiex_get_unused_priv_by_bss_type(
                                                adapter, MWIFIEX_BSS_TYPE_STA);
                if (!priv) {
                        mwifiex_dbg(adapter, ERROR,
                                    "could not get free private struct\n");
                        return ERR_PTR(-EFAULT);
                }

                priv->wdev.wiphy = wiphy;
                priv->wdev.iftype = NL80211_IFTYPE_STATION;

                if (type == NL80211_IFTYPE_UNSPECIFIED)
                        priv->bss_mode = NL80211_IFTYPE_STATION;
                else
                        priv->bss_mode = type;

                priv->bss_type = MWIFIEX_BSS_TYPE_STA;
                priv->frame_type = MWIFIEX_DATA_FRAME_TYPE_ETH_II;
                priv->bss_priority = 0;
                priv->bss_role = MWIFIEX_BSS_ROLE_STA;

                break;
        case NL80211_IFTYPE_AP:
                if (adapter->curr_iface_comb.uap_intf ==
                    adapter->iface_limit.uap_intf) {
                        mwifiex_dbg(adapter, ERROR,
                                    "cannot create multiple AP ifaces\n");
                        return ERR_PTR(-EINVAL);
                }

                priv = mwifiex_get_unused_priv_by_bss_type(
                                                adapter, MWIFIEX_BSS_TYPE_UAP);
                if (!priv) {
                        mwifiex_dbg(adapter, ERROR,
                                    "could not get free private struct\n");
                        return ERR_PTR(-EFAULT);
                }

                priv->wdev.wiphy = wiphy;
                priv->wdev.iftype = NL80211_IFTYPE_AP;

                priv->bss_type = MWIFIEX_BSS_TYPE_UAP;
                priv->frame_type = MWIFIEX_DATA_FRAME_TYPE_ETH_II;
                priv->bss_priority = 0;
                priv->bss_role = MWIFIEX_BSS_ROLE_UAP;
                priv->bss_started = 0;
                priv->bss_mode = type;

                break;
        case NL80211_IFTYPE_P2P_CLIENT:
                if (adapter->curr_iface_comb.p2p_intf ==
                    adapter->iface_limit.p2p_intf) {
                        mwifiex_dbg(adapter, ERROR,
                                    "cannot create multiple P2P ifaces\n");
                        return ERR_PTR(-EINVAL);
                }

                priv = mwifiex_get_unused_priv_by_bss_type(
                                                adapter, MWIFIEX_BSS_TYPE_P2P);
                if (!priv) {
                        mwifiex_dbg(adapter, ERROR,
                                    "could not get free private struct\n");
                        return ERR_PTR(-EFAULT);
                }

                priv->wdev.wiphy = wiphy;
                /* At start-up, wpa_supplicant tries to change the interface
                 * to NL80211_IFTYPE_STATION if it is not managed mode.
                 */
                priv->wdev.iftype = NL80211_IFTYPE_P2P_CLIENT;
                priv->bss_mode = NL80211_IFTYPE_P2P_CLIENT;

                /* Setting bss_type to P2P tells firmware that this interface
                 * is receiving P2P peers found during find phase and doing
                 * action frame handshake.
                 */
                priv->bss_type = MWIFIEX_BSS_TYPE_P2P;

                priv->frame_type = MWIFIEX_DATA_FRAME_TYPE_ETH_II;
                priv->bss_priority = MWIFIEX_BSS_ROLE_STA;
                priv->bss_role = MWIFIEX_BSS_ROLE_STA;
                priv->bss_started = 0;

                if (mwifiex_cfg80211_init_p2p_client(priv)) {
                        memset(&priv->wdev, 0, sizeof(priv->wdev));
                        priv->wdev.iftype = NL80211_IFTYPE_UNSPECIFIED;
                        return ERR_PTR(-EFAULT);
                }

                break;
        default:
                mwifiex_dbg(adapter, ERROR, "type not supported\n");
                return ERR_PTR(-EINVAL);
        }

        dev = alloc_netdev_mqs(sizeof(struct mwifiex_private *), name,
                               name_assign_type, ether_setup,
                               IEEE80211_NUM_ACS, 1);
        if (!dev) {
                mwifiex_dbg(adapter, ERROR,
                            "no memory available for netdevice\n");
                ret = -ENOMEM;
                goto err_alloc_netdev;
        }

        mwifiex_init_priv_params(priv, dev);

        priv->netdev = dev;

        if (!adapter->mfg_mode) {
                mwifiex_set_mac_address(priv, dev);

                ret = mwifiex_send_cmd(priv, HostCmd_CMD_SET_BSS_MODE,
                                       HostCmd_ACT_GEN_SET, 0, NULL, true);
                if (ret)
                        goto err_set_bss_mode;

                ret = mwifiex_sta_init_cmd(priv, false, false);
                if (ret)
                        goto err_sta_init;
        }

        mwifiex_setup_ht_caps(&wiphy->bands[NL80211_BAND_2GHZ]->ht_cap, priv);
        if (adapter->is_hw_11ac_capable)
                mwifiex_setup_vht_caps(
                        &wiphy->bands[NL80211_BAND_2GHZ]->vht_cap, priv);

        if (adapter->config_bands & BAND_A)
                mwifiex_setup_ht_caps(
                        &wiphy->bands[NL80211_BAND_5GHZ]->ht_cap, priv);

        if ((adapter->config_bands & BAND_A) && adapter->is_hw_11ac_capable)
                mwifiex_setup_vht_caps(
                        &wiphy->bands[NL80211_BAND_5GHZ]->vht_cap, priv);

        dev_net_set(dev, wiphy_net(wiphy));
        dev->ieee80211_ptr = &priv->wdev;
        dev->ieee80211_ptr->iftype = priv->bss_mode;
        SET_NETDEV_DEV(dev, wiphy_dev(wiphy));

        dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
        dev->watchdog_timeo = MWIFIEX_DEFAULT_WATCHDOG_TIMEOUT;
        dev->hard_header_len += MWIFIEX_MIN_DATA_HEADER_LEN;
        dev->ethtool_ops = &mwifiex_ethtool_ops;