/*
 * Marvell Wireless LAN device driver: HW/FW Initialization
 *
 * 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 "decl.h"
#include "ioctl.h"
#include "util.h"
#include "fw.h"
#include "main.h"
#include "wmm.h"
#include "11n.h"

/*
 * This function adds a BSS priority table to the table list.
 *
 * The function allocates a new BSS priority table node and adds it to
 * the end of BSS priority table list, kept in driver memory.
 */
static int mwifiex_add_bss_prio_tbl(struct mwifiex_private *priv)
{
        struct mwifiex_adapter *adapter = priv->adapter;
        struct mwifiex_bss_prio_node *bss_prio;
        struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
        unsigned long flags;

        bss_prio = kzalloc(sizeof(struct mwifiex_bss_prio_node), GFP_KERNEL);
        if (!bss_prio)
                return -ENOMEM;

        bss_prio->priv = priv;
        INIT_LIST_HEAD(&bss_prio->list);

        spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
        list_add_tail(&bss_prio->list, &tbl[priv->bss_priority].bss_prio_head);
        spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);

        return 0;
}

static void wakeup_timer_fn(unsigned long data)
{
        struct mwifiex_adapter *adapter = (struct mwifiex_adapter *)data;

        dev_err(adapter->dev, "Firmware wakeup failed\n");
        adapter->hw_status = MWIFIEX_HW_STATUS_RESET;
        mwifiex_cancel_all_pending_cmd(adapter);

        if (adapter->if_ops.card_reset)
                adapter->if_ops.card_reset(adapter);
}

/*
 * This function initializes the private structure and sets default
 * values to the members.
 *
 * Additionally, it also initializes all the locks and sets up all the
 * lists.
 */
int mwifiex_init_priv(struct mwifiex_private *priv)
{
        u32 i;

        priv->media_connected = false;
        eth_broadcast_addr(priv->curr_addr);

        priv->pkt_tx_ctrl = 0;
        priv->bss_mode = NL80211_IFTYPE_UNSPECIFIED;
        priv->data_rate = 0;    /* Initially indicate the rate as auto */
        priv->is_data_rate_auto = true;
        priv->bcn_avg_factor = DEFAULT_BCN_AVG_FACTOR;
        priv->data_avg_factor = DEFAULT_DATA_AVG_FACTOR;

        priv->sec_info.wep_enabled = 0;
        priv->sec_info.authentication_mode = NL80211_AUTHTYPE_OPEN_SYSTEM;
        priv->sec_info.encryption_mode = 0;
        for (i = 0; i < ARRAY_SIZE(priv->wep_key); i++)
                memset(&priv->wep_key[i], 0, sizeof(struct mwifiex_wep_key));
        priv->wep_key_curr_index = 0;
        priv->curr_pkt_filter = HostCmd_ACT_MAC_RX_ON | HostCmd_ACT_MAC_TX_ON |
                                HostCmd_ACT_MAC_ETHERNETII_ENABLE;

        priv->beacon_period = 100; /* beacon interval */ ;
        priv->attempted_bss_desc = NULL;
        memset(&priv->curr_bss_params, 0, sizeof(priv->curr_bss_params));
        priv->listen_interval = MWIFIEX_DEFAULT_LISTEN_INTERVAL;

        memset(&priv->prev_ssid, 0, sizeof(priv->prev_ssid));
        memset(&priv->prev_bssid, 0, sizeof(priv->prev_bssid));
        memset(&priv->assoc_rsp_buf, 0, sizeof(priv->assoc_rsp_buf));
        priv->assoc_rsp_size = 0;
        priv->adhoc_channel = DEFAULT_AD_HOC_CHANNEL;
        priv->atim_window = 0;
        priv->adhoc_state = ADHOC_IDLE;
        priv->tx_power_level = 0;
        priv->max_tx_power_level = 0;
        priv->min_tx_power_level = 0;
        priv->tx_rate = 0;
        priv->rxpd_htinfo = 0;
        priv->rxpd_rate = 0;
        priv->rate_bitmap = 0;
        priv->data_rssi_last = 0;
        priv->data_rssi_avg = 0;
        priv->data_nf_avg = 0;
        priv->data_nf_last = 0;
        priv->bcn_rssi_last = 0;
        priv->bcn_rssi_avg = 0;
        priv->bcn_nf_avg = 0;
        priv->bcn_nf_last = 0;
        memset(&priv->wpa_ie, 0, sizeof(priv->wpa_ie));
        memset(&priv->aes_key, 0, sizeof(priv->aes_key));
        priv->wpa_ie_len = 0;
        priv->wpa_is_gtk_set = false;

        memset(&priv->assoc_tlv_buf, 0, sizeof(priv->assoc_tlv_buf));
        priv->assoc_tlv_buf_len = 0;
        memset(&priv->wps, 0, sizeof(priv->wps));
        memset(&priv->gen_ie_buf, 0, sizeof(priv->gen_ie_buf));
        priv->gen_ie_buf_len = 0;
        memset(priv->vs_ie, 0, sizeof(priv->vs_ie));

        priv->wmm_required = true;
        priv->wmm_enabled = false;
        priv->wmm_qosinfo = 0;
        priv->curr_bcn_buf = NULL;
        priv->curr_bcn_size = 0;
        priv->wps_ie = NULL;
        priv->wps_ie_len = 0;
        priv->ap_11n_enabled = 0;
        memset(&priv->roc_cfg, 0, sizeof(priv->roc_cfg));

        priv->scan_block = false;

        priv->csa_chan = 0;
        priv->csa_expire_time = 0;
        priv->del_list_idx = 0;
        priv->hs2_enabled = false;
        priv->check_tdls_tx = false;
        memcpy(priv->tos_to_tid_inv, tos_to_tid_inv, MAX_NUM_TID);

        mwifiex_init_11h_params(priv);

        return mwifiex_add_bss_prio_tbl(priv);
}

/*
 * This function allocates buffers for members of the adapter
 * structure.
 *
 * The memory allocated includes scan table, command buffers, and
 * sleep confirm command buffer. In addition, the queues are
 * also initialized.
 */
static int mwifiex_allocate_adapter(struct mwifiex_adapter *adapter)
{
        int ret;

        /* Allocate command buffer */
        ret = mwifiex_alloc_cmd_buffer(adapter);
        if (ret) {
                dev_err(adapter->dev, "%s: failed to alloc cmd buffer\n",
                        __func__);
                return -1;
        }

        adapter->sleep_cfm =
                dev_alloc_skb(sizeof(struct mwifiex_opt_sleep_confirm)
                              + INTF_HEADER_LEN);

        if (!adapter->sleep_cfm) {
                dev_err(adapter->dev, "%s: failed to alloc sleep cfm"
                        " cmd buffer\n", __func__);
                return -1;
        }
        skb_reserve(adapter->sleep_cfm, INTF_HEADER_LEN);

        return 0;
}

/*
 * This function initializes the adapter structure and sets default
 * values to the members of adapter.
 *
 * This also initializes the WMM related parameters in the driver private
 * structures.
 */
static void mwifiex_init_adapter(struct mwifiex_adapter *adapter)
{
        struct mwifiex_opt_sleep_confirm *sleep_cfm_buf = NULL;

        skb_put(adapter->sleep_cfm, sizeof(struct mwifiex_opt_sleep_confirm));

        adapter->cmd_sent = false;

        if (adapter->iface_type == MWIFIEX_SDIO)
                adapter->data_sent = true;
        else
                adapter->data_sent = false;

        adapter->cmd_resp_received = false;
        adapter->event_received = false;
        adapter->data_received = false;

        adapter->surprise_removed = false;

        adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;

        adapter->ps_mode = MWIFIEX_802_11_POWER_MODE_CAM;
        adapter->ps_state = PS_STATE_AWAKE;
        adapter->need_to_wakeup = false;

        adapter->scan_mode = HostCmd_BSS_MODE_ANY;
        adapter->specific_scan_time = MWIFIEX_SPECIFIC_SCAN_CHAN_TIME;
        adapter->active_scan_time = MWIFIEX_ACTIVE_SCAN_CHAN_TIME;
        adapter->passive_scan_time = MWIFIEX_PASSIVE_SCAN_CHAN_TIME;
        adapter->scan_chan_gap_time = MWIFIEX_DEF_SCAN_CHAN_GAP_TIME;

        adapter->scan_probes = 1;

        adapter->multiple_dtim = 1;

        adapter->local_listen_interval = 0;     /* default value in firmware
                                                   will be used */

        adapter->is_deep_sleep = false;

        adapter->delay_null_pkt = false;
        adapter->delay_to_ps = 1000;
        adapter->enhanced_ps_mode = PS_MODE_AUTO;

        adapter->gen_null_pkt = false;  /* Disable NULL Pkg generation by
                                           default */
        adapter->pps_uapsd_mode = false; /* Disable pps/uapsd mode by
                                           default */
        adapter->pm_wakeup_card_req = false;

        adapter->pm_wakeup_fw_try = false;

        adapter->curr_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;

        adapter->is_hs_configured = false;
        adapter->hs_cfg.conditions = cpu_to_le32(HS_CFG_COND_DEF);
        adapter->hs_cfg.gpio = HS_CFG_GPIO_DEF;
        adapter->hs_cfg.gap = HS_CFG_GAP_DEF;
        adapter->hs_activated = false;

        memset(adapter->event_body, 0, sizeof(adapter->event_body));
        adapter->hw_dot_11n_dev_cap = 0;
        adapter->hw_dev_mcs_support = 0;
        adapter->sec_chan_offset = 0;
        adapter->adhoc_11n_enabled = false;

        mwifiex_wmm_init(adapter);

        sleep_cfm_buf = (struct mwifiex_opt_sleep_confirm *)
                                        adapter->sleep_cfm->data;
        memset(sleep_cfm_buf, 0, adapter->sleep_cfm->len);
        sleep_cfm_buf->command = cpu_to_le16(HostCmd_CMD_802_11_PS_MODE_ENH);
        sleep_cfm_buf->size = cpu_to_le16(adapter->sleep_cfm->len);
        sleep_cfm_buf->result = 0;
        sleep_cfm_buf->action = cpu_to_le16(SLEEP_CONFIRM);
        sleep_cfm_buf->resp_ctrl = cpu_to_le16(RESP_NEEDED);

        memset(&adapter->sleep_params, 0, sizeof(adapter->sleep_params));
        memset(&adapter->sleep_period, 0, sizeof(adapter->sleep_period));
        adapter->tx_lock_flag = false;
        adapter->null_pkt_interval = 0;
        adapter->fw_bands = 0;
        adapter->config_bands = 0;
        adapter->adhoc_start_band = 0;
        adapter->scan_channels = NULL;
        adapter->fw_release_number = 0;
        adapter->fw_cap_info = 0;
        memset(&adapter->upld_buf, 0, sizeof(adapter->upld_buf));
        adapter->event_cause = 0;
        adapter->region_code = 0;
        adapter->bcn_miss_time_out = DEFAULT_BCN_MISS_TIMEOUT;
        adapter->adhoc_awake_period = 0;
        memset(&adapter->arp_filter, 0, sizeof(adapter->arp_filter));
        adapter->arp_filter_size = 0;
        adapter->max_mgmt_ie_index = MAX_MGMT_IE_INDEX;
        adapter->key_api_major_ver = 0;
        adapter->key_api_minor_ver = 0;
        eth_broadcast_addr(adapter->perm_addr);
        adapter->iface_limit.sta_intf = MWIFIEX_MAX_STA_NUM;
        adapter->iface_limit.uap_intf = MWIFIEX_MAX_UAP_NUM;
        adapter->iface_limit.p2p_intf = MWIFIEX_MAX_P2P_NUM;

        setup_timer(&adapter->wakeup_timer, wakeup_timer_fn,
                    (unsigned long)adapter);
}

/*
 * This function sets trans_start per tx_queue
 */
void mwifiex_set_trans_start(struct net_device *dev)
{
        int i;

        for (i = 0; i < dev->num_tx_queues; i++)
                netdev_get_tx_queue(dev, i)->trans_start = jiffies;

        dev->trans_start = jiffies;
}

/*
 * This function wakes up all queues in net_device
 */
void mwifiex_wake_up_net_dev_queue(struct net_device *netdev,
                                        struct mwifiex_adapter *adapter)
{
        unsigned long dev_queue_flags;
        unsigned int i;

        spin_lock_irqsave(&adapter->queue_lock, dev_queue_flags);

        for (i = 0; i < netdev->num_tx_queues; i++) {
                struct netdev_queue *txq = netdev_get_tx_queue(netdev, i);

                if (netif_tx_queue_stopped(txq))
                        netif_tx_wake_queue(txq);
        }

        spin_unlock_irqrestore(&adapter->queue_lock, dev_queue_flags);
}

/*
 * This function stops all queues in net_device
 */
void mwifiex_stop_net_dev_queue(struct net_device *netdev,
                                        struct mwifiex_adapter *adapter)
{
        unsigned long dev_queue_flags;
        unsigned int i;

        spin_lock_irqsave(&adapter->queue_lock, dev_queue_flags);

        for (i = 0; i < netdev->num_tx_queues; i++) {
                struct netdev_queue *txq = netdev_get_tx_queue(netdev, i);

                if (!netif_tx_queue_stopped(txq))
                        netif_tx_stop_queue(txq);
        }

        spin_unlock_irqrestore(&adapter->queue_lock, dev_queue_flags);
}

/*
 *  This function releases the lock variables and frees the locks and
 *  associated locks.
 */
static void mwifiex_free_lock_list(struct mwifiex_adapter *adapter)
{
        struct mwifiex_private *priv;
        s32 i, j;

        /* Free lists */
        list_del(&adapter->cmd_free_q);
        list_del(&adapter->cmd_pending_q);
        list_del(&adapter->scan_pending_q);

        for (i = 0; i < adapter->priv_num; i++)
                list_del(&adapter->bss_prio_tbl[i].bss_prio_head);

        for (i = 0; i < adapter->priv_num; i++) {
                if (adapter->priv[i]) {
                        priv = adapter->priv[i];
                        for (j = 0; j < MAX_NUM_TID; ++j)
                                list_del(&priv->wmm.tid_tbl_ptr[j].ra_list);
                        list_del(&priv->tx_ba_stream_tbl_ptr);
                        list_del(&priv->rx_reorder_tbl_ptr);
                        list_del(&priv->sta_list);
                        list_del(&priv->auto_tdls_list);
                }
        }
}

/*
 * This function performs cleanup for adapter structure.
 *
 * The cleanup is done recursively, by canceling all pending
 * commands, freeing the member buffers previously allocated
 * (command buffers, scan table buffer, sleep confirm command
 * buffer), stopping the timers and calling the cleanup routines
 * for every interface.
 */
static void
mwifiex_adapter_cleanup(struct mwifiex_adapter *adapter)
{
        int idx;

        if (!adapter) {
                pr_err("%s: adapter is NULL\n", __func__);
                return;
        }

        del_timer(&adapter->wakeup_timer);
        mwifiex_cancel_all_pending_cmd(adapter);
        wake_up_interruptible(&adapter->cmd_wait_q.wait);
        wake_up_interruptible(&adapter->hs_activate_wait_q);

        /* Free lock variables */
        mwifiex_free_lock_list(adapter);

        /* Free command buffer */
        dev_dbg(adapter->dev, "info: free cmd buffer\n");
        mwifiex_free_cmd_buffer(adapter);

        for (idx = 0; idx < adapter->num_mem_types; idx++) {
                struct memory_type_mapping *entry =
                                &adapter->mem_type_mapping_tbl[idx];

                if (entry->mem_ptr) {
                        vfree(entry->mem_ptr);
                        entry->mem_ptr = NULL;
                }
                entry->mem_size = 0;
        }

        if (adapter->drv_info_dump) {
                vfree(adapter->drv_info_dump);
                adapter->drv_info_size = 0;
        }

        if (adapter->sleep_cfm)
                dev_kfree_skb_any(adapter->sleep_cfm);
}

/*
 *  This function intializes the lock variables and
 *  the list heads.
 */
int mwifiex_init_lock_list(struct mwifiex_adapter *adapter)
{
        struct mwifiex_private *priv;
        s32 i, j;

        spin_lock_init(&adapter->mwifiex_lock);
        spin_lock_init(&adapter->int_lock);
        spin_lock_init(&adapter->main_proc_lock);
        spin_lock_init(&adapter->mwifiex_cmd_lock);
        spin_lock_init(&adapter->queue_lock);
        for (i = 0; i < adapter->priv_num; i++) {
                if (adapter->priv[i]) {
                        priv = adapter->priv[i];
                        spin_lock_init(&priv->rx_pkt_lock);
                        spin_lock_init(&priv->wmm.ra_list_spinlock);
                        spin_lock_init(&priv->curr_bcn_buf_lock);
                        spin_lock_init(&priv->sta_list_spinlock);
                        spin_lock_init(&priv->auto_tdls_lock);
                }
        }

        /* Initialize cmd_free_q */
        INIT_LIST_HEAD(&adapter->cmd_free_q);
        /* Initialize cmd_pending_q */
        INIT_LIST_HEAD(&adapter->cmd_pending_q);
        /* Initialize scan_pending_q */
        INIT_LIST_HEAD(&adapter->scan_pending_q);

        spin_lock_init(&adapter->cmd_free_q_lock);
        spin_lock_init(&adapter->cmd_pending_q_lock);
        spin_lock_init(&adapter->scan_pending_q_lock);
        spin_lock_init(&adapter->rx_proc_lock);

        skb_queue_head_init(&adapter->rx_data_q);
        skb_queue_head_init(&adapter->tx_data_q);

        for (i = 0; i < adapter->priv_num; ++i) {
                INIT_LIST_HEAD(&adapter->bss_prio_tbl[i].bss_prio_head);
                spin_lock_init(&adapter->bss_prio_tbl[i].bss_prio_lock);
        }

        for (i = 0; i < adapter->priv_num; i++) {
                if (!adapter->priv[i])
                        continue;
                priv = adapter->priv[i];
                for (j = 0; j < MAX_NUM_TID; ++j)
                        INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[j].ra_list);
                INIT_LIST_HEAD(&priv->tx_ba_stream_tbl_ptr);
                INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
                INIT_LIST_HEAD(&priv->sta_list);
                INIT_LIST_HEAD(&priv->auto_tdls_list);
                skb_queue_head_init(&priv->tdls_txq);

                spin_lock_init(&priv->tx_ba_stream_tbl_lock);
                spin_lock_init(&priv->rx_reorder_tbl_lock);

                spin_lock_init(&priv->ack_status_lock);
                idr_init(&priv->ack_status_frames);
        }

        return 0;
}

/*
 * This function initializes the firmware.
 *
 * The following operations are performed sequentially -
 *      - Allocate adapter structure
 *      - Initialize the adapter structure
 *      - Initialize the private structure
 *      - Add BSS priority tables to the adapter structure
 *      - For each interface, send the init commands to firmware
 *      - Send the first command in command pending queue, if available
 */
int mwifiex_init_fw(struct mwifiex_adapter *adapter)
{
        int ret;
        struct mwifiex_private *priv;
        u8 i, first_sta = true;
        int is_cmd_pend_q_empty;
        unsigned long flags;

        adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;

        /* Allocate memory for member of adapter structure */
        ret = mwifiex_allocate_adapter(adapter);
        if (ret)
                return -1;

        /* Initialize adapter structure */
        mwifiex_init_adapter(adapter);

        for (i = 0; i < adapter->priv_num; i++) {
                if (adapter->priv[i]) {
                        priv = adapter->priv[i];

                        /* Initialize private structure */
                        ret = mwifiex_init_priv(priv);
                        if (ret)
                                return -1;
                }
        }

        if (adapter->if_ops.init_fw_port) {
                if (adapter->if_ops.init_fw_port(adapter))
                        return -1;
        }

        for (i = 0; i < adapter->priv_num; i++) {
                if (adapter->priv[i]) {
                        ret = mwifiex_sta_init_cmd(adapter->priv[i], first_sta,
                                                   true);
                        if (ret == -1)
                                return -1;

                        first_sta = false;
                }
        }

        spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
        is_cmd_pend_q_empty = list_empty(&adapter->cmd_pending_q);
        spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);
        if (!is_cmd_pend_q_empty) {
                /* Send the first command in queue and return */
                if (mwifiex_main_process(adapter) != -1)
                        ret = -EINPROGRESS;
        } else {
                adapter->hw_status = MWIFIEX_HW_STATUS_READY;
        }

        return ret;
}

/*
 * This function deletes the BSS priority tables.
 *
 * The function traverses through all the allocated BSS priority nodes
 * in every BSS priority table and frees them.
 */
static void mwifiex_delete_bss_prio_tbl(struct mwifiex_private *priv)
{
        int i;
        struct mwifiex_adapter *adapter = priv->adapter;
        struct mwifiex_bss_prio_node *bssprio_node, *tmp_node;
        struct list_head *head;
        spinlock_t *lock; /* bss priority lock */
        unsigned long flags;

        for (i = 0; i < adapter->priv_num; ++i) {
                head = &adapter->bss_prio_tbl[i].bss_prio_head;
                lock = &adapter->bss_prio_tbl[i].bss_prio_lock;
                dev_dbg(adapter->dev, "info: delete BSS priority table,"
                                " bss_type = %d, bss_num = %d, i = %d,"
                                " head = %p\n",
                              priv->bss_type, priv->bss_num, i, head);

                {
                        spin_lock_irqsave(lock, flags);
                        if (list_empty(head)) {
                                spin_unlock_irqrestore(lock, flags);
                                continue;
                        }
                        list_for_each_entry_safe(bssprio_node, tmp_node, head,
                                                 list) {
                                if (bssprio_node->priv == priv) {
                                        dev_dbg(adapter->dev, "info: Delete "
                                                "node %p, next = %p\n",
                                                bssprio_node, tmp_node);
                                        list_del(&bssprio_node->list);
                                        kfree(bssprio_node);
                                }
                        }
                        spin_unlock_irqrestore(lock, flags);
                }
        }
}

/*
 * This function frees the private structure, including cleans
 * up the TX and RX queues and frees the BSS priority tables.
 */
void mwifiex_free_priv(struct mwifiex_private *priv)
{
        mwifiex_clean_txrx(priv);
        mwifiex_delete_bss_prio_tbl(priv);
        mwifiex_free_curr_bcn(priv);
}

/*
 * This function is used to shutdown the driver.
 *
 * The following operations are performed sequentially -
 *      - Check if already shut down
 *      - Make sure the main process has stopped
 *      - Clean up the Tx and Rx queues
 *      - Delete BSS priority tables
 *      - Free the adapter
 *      - Notify completion
 */
int
mwifiex_shutdown_drv(struct mwifiex_adapter *adapter)
{
        int ret = -EINPROGRESS;
        struct mwifiex_private *priv;
        s32 i;
        unsigned long flags;
        struct sk_buff *skb;

        /* mwifiex already shutdown */
        if (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY)
                return 0;

        adapter->hw_status = MWIFIEX_HW_STATUS_CLOSING;
        /* wait for mwifiex_process to complete */
        if (adapter->mwifiex_processing) {
                dev_warn(adapter->dev, "main process is still running\n");
                return ret;
        }

        /* cancel current command */
        if (adapter->curr_cmd) {
                dev_warn(adapter->dev, "curr_cmd is still in processing\n");
                del_timer_sync(&adapter->cmd_timer);
                mwifiex_recycle_cmd_node(adapter, adapter->curr_cmd);
                adapter->curr_cmd = NULL;
        }

        /* shut down mwifiex */
        dev_dbg(adapter->dev, "info: shutdown mwifiex...\n");

        /* Clean up Tx/Rx queues and delete BSS priority table */
        for (i = 0; i < adapter->priv_num; i++) {
                if (adapter->priv[i]) {
                        priv = adapter->priv[i];

                        mwifiex_clean_auto_tdls(priv);
                        mwifiex_abort_cac(priv);
                        mwifiex_clean_txrx(priv);
                        mwifiex_delete_bss_prio_tbl(priv);
                }
        }

        atomic_set(&adapter->tx_queued, 0);
        while ((skb = skb_dequeue(&adapter->tx_data_q)))
                mwifiex_write_data_complete(adapter, skb, 0, 0);

        spin_lock_irqsave(&adapter->rx_proc_lock, flags);

        while ((skb = skb_dequeue(&adapter->rx_data_q))) {
                struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);

                atomic_dec(&adapter->rx_pending);
                priv = adapter->priv[rx_info->bss_num];
                if (priv)
                        priv->stats.rx_dropped++;

                dev_kfree_skb_any(skb);
        }

        spin_unlock_irqrestore(&adapter->rx_proc_lock, flags);

        spin_lock(&adapter->mwifiex_lock);

        mwifiex_adapter_cleanup(adapter);

        spin_unlock(&adapter->mwifiex_lock);

        /* Notify completion */
        ret = mwifiex_shutdown_fw_complete(adapter);

        return ret;
}

/*
 * This function downloads the firmware to the card.
 *
 * The actual download is preceded by two sanity checks -
 *      - Check if firmware is already running
 *      - Check if the interface is the winner to download the firmware
 *
 * ...and followed by another -
 *      - Check if the firmware is downloaded successfully
 *
 * After download is successfully completed, the host interrupts are enabled.
 */
int mwifiex_dnld_fw(struct mwifiex_adapter *adapter,
                    struct mwifiex_fw_image *pmfw)
{
        int ret;
        u32 poll_num = 1;

        if (adapter->if_ops.check_fw_status) {
                adapter->winner = 0;

                /* check if firmware is already running */
                ret = adapter->if_ops.check_fw_status(adapter, poll_num);
                if (!ret) {
                        dev_notice(adapter->dev,
                                   "WLAN FW already running! Skip FW dnld\n");
                        return 0;
                }

                poll_num = MAX_FIRMWARE_POLL_TRIES;

                /* check if we are the winner for downloading FW */
                if (!adapter->winner) {
                        dev_notice(adapter->dev,
                                   "FW already running! Skip FW dnld\n");
                        goto poll_fw;
                }
        }

        if (pmfw) {
                /* Download firmware with helper */
                ret = adapter->if_ops.prog_fw(adapter, pmfw);
                if (ret) {
                        dev_err(adapter->dev, "prog_fw failed ret=%#x\n", ret);
                        return ret;
                }
        }

poll_fw:
        /* Check if the firmware is downloaded successfully or not */
        ret = adapter->if_ops.check_fw_status(adapter, poll_num);
        if (ret)
                dev_err(adapter->dev, "FW failed to be active in time\n");

        return ret;
}