drivers/net/wireless/mwifiex/init.c

   1 /*
   2  * Marvell Wireless LAN device driver: HW/FW Initialization
   3  *
   4  * Copyright (C) 2011, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available by writing to the Free Software Foundation, Inc.,
  11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13  *
  14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17  * this warranty disclaimer.
  18  */
  19
  20 #include "decl.h"
  21 #include "ioctl.h"
  22 #include "util.h"
  23 #include "fw.h"
  24 #include "main.h"
  25 #include "wmm.h"
  26 #include "11n.h"
  27
  28 /*
  29  * This function adds a BSS priority table to the table list.
  30  *
  31  * The function allocates a new BSS priority table node and adds it to
  32  * the end of BSS priority table list, kept in driver memory.
  33  */
  34 static int mwifiex_add_bss_prio_tbl(struct mwifiex_private *priv)
  35 {
  36         struct mwifiex_adapter *adapter = priv->adapter;
  37         struct mwifiex_bss_prio_node *bss_prio;
  38         struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
  39         unsigned long flags;
  40
  41         bss_prio = kzalloc(sizeof(struct mwifiex_bss_prio_node), GFP_KERNEL);
  42         if (!bss_prio)
  43                 return -ENOMEM;
  44
  45         bss_prio->priv = priv;
  46         INIT_LIST_HEAD(&bss_prio->list);
  47
  48         spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
  49         list_add_tail(&bss_prio->list, &tbl[priv->bss_priority].bss_prio_head);
  50         spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);
  51
  52         return 0;
  53 }
  54
  55 /*
  56  * This function initializes the private structure and sets default
  57  * values to the members.
  58  *
  59  * Additionally, it also initializes all the locks and sets up all the
  60  * lists.
  61  */
  62 int mwifiex_init_priv(struct mwifiex_private *priv)
  63 {
  64         u32 i;
  65
  66         priv->media_connected = false;
  67         memset(priv->curr_addr, 0xff, ETH_ALEN);
  68
  69         priv->pkt_tx_ctrl = 0;
  70         priv->bss_mode = NL80211_IFTYPE_UNSPECIFIED;
  71         priv->data_rate = 0;    /* Initially indicate the rate as auto */
  72         priv->is_data_rate_auto = true;
  73         priv->bcn_avg_factor = DEFAULT_BCN_AVG_FACTOR;
  74         priv->data_avg_factor = DEFAULT_DATA_AVG_FACTOR;
  75
  76         priv->sec_info.wep_enabled = 0;
  77         priv->sec_info.authentication_mode = NL80211_AUTHTYPE_OPEN_SYSTEM;
  78         priv->sec_info.encryption_mode = 0;
  79         for (i = 0; i < ARRAY_SIZE(priv->wep_key); i++)
  80                 memset(&priv->wep_key[i], 0, sizeof(struct mwifiex_wep_key));
  81         priv->wep_key_curr_index = 0;
  82         priv->curr_pkt_filter = HostCmd_ACT_MAC_RX_ON | HostCmd_ACT_MAC_TX_ON |
  83                                 HostCmd_ACT_MAC_ETHERNETII_ENABLE;
  84
  85         priv->beacon_period = 100; /* beacon interval */ ;
  86         priv->attempted_bss_desc = NULL;
  87         memset(&priv->curr_bss_params, 0, sizeof(priv->curr_bss_params));
  88         priv->listen_interval = MWIFIEX_DEFAULT_LISTEN_INTERVAL;
  89
  90         memset(&priv->prev_ssid, 0, sizeof(priv->prev_ssid));
  91         memset(&priv->prev_bssid, 0, sizeof(priv->prev_bssid));
  92         memset(&priv->assoc_rsp_buf, 0, sizeof(priv->assoc_rsp_buf));
  93         priv->assoc_rsp_size = 0;
  94         priv->adhoc_channel = DEFAULT_AD_HOC_CHANNEL;
  95         priv->atim_window = 0;
  96         priv->adhoc_state = ADHOC_IDLE;
  97         priv->tx_power_level = 0;
  98         priv->max_tx_power_level = 0;
  99         priv->min_tx_power_level = 0;
 100         priv->tx_rate = 0;
 101         priv->rxpd_htinfo = 0;
 102         priv->rxpd_rate = 0;
 103         priv->rate_bitmap = 0;
 104         priv->data_rssi_last = 0;
 105         priv->data_rssi_avg = 0;
 106         priv->data_nf_avg = 0;
 107         priv->data_nf_last = 0;
 108         priv->bcn_rssi_last = 0;
 109         priv->bcn_rssi_avg = 0;
 110         priv->bcn_nf_avg = 0;
 111         priv->bcn_nf_last = 0;
 112         memset(&priv->wpa_ie, 0, sizeof(priv->wpa_ie));
 113         memset(&priv->aes_key, 0, sizeof(priv->aes_key));
 114         priv->wpa_ie_len = 0;
 115         priv->wpa_is_gtk_set = false;
 116
 117         memset(&priv->assoc_tlv_buf, 0, sizeof(priv->assoc_tlv_buf));
 118         priv->assoc_tlv_buf_len = 0;
 119         memset(&priv->wps, 0, sizeof(priv->wps));
 120         memset(&priv->gen_ie_buf, 0, sizeof(priv->gen_ie_buf));
 121         priv->gen_ie_buf_len = 0;
 122         memset(priv->vs_ie, 0, sizeof(priv->vs_ie));
 123
 124         priv->wmm_required = true;
 125         priv->wmm_enabled = false;
 126         priv->wmm_qosinfo = 0;
 127         priv->curr_bcn_buf = NULL;
 128         priv->curr_bcn_size = 0;
 129         priv->wps_ie = NULL;
 130         priv->wps_ie_len = 0;
 131         priv->ap_11n_enabled = 0;
 132         memset(&priv->roc_cfg, 0, sizeof(priv->roc_cfg));
 133
 134         priv->scan_block = false;
 135
 136         priv->csa_chan = 0;
 137         priv->csa_expire_time = 0;
 138         priv->del_list_idx = 0;
 139         priv->hs2_enabled = false;
 140
 141         return mwifiex_add_bss_prio_tbl(priv);
 142 }
 143
 144 /*
 145  * This function allocates buffers for members of the adapter
 146  * structure.
 147  *
 148  * The memory allocated includes scan table, command buffers, and
 149  * sleep confirm command buffer. In addition, the queues are
 150  * also initialized.
 151  */
 152 static int mwifiex_allocate_adapter(struct mwifiex_adapter *adapter)
 153 {
 154         int ret;
 155
 156         /* Allocate command buffer */
 157         ret = mwifiex_alloc_cmd_buffer(adapter);
 158         if (ret) {
 159                 dev_err(adapter->dev, "%s: failed to alloc cmd buffer\n",
 160                         __func__);
 161                 return -1;
 162         }
 163
 164         adapter->sleep_cfm =
 165                 dev_alloc_skb(sizeof(struct mwifiex_opt_sleep_confirm)
 166                               + INTF_HEADER_LEN);
 167
 168         if (!adapter->sleep_cfm) {
 169                 dev_err(adapter->dev, "%s: failed to alloc sleep cfm"
 170                         " cmd buffer\n", __func__);
 171                 return -1;
 172         }
 173         skb_reserve(adapter->sleep_cfm, INTF_HEADER_LEN);
 174
 175         return 0;
 176 }
 177
 178 /*
 179  * This function initializes the adapter structure and sets default
 180  * values to the members of adapter.
 181  *
 182  * This also initializes the WMM related parameters in the driver private
 183  * structures.
 184  */
 185 static void mwifiex_init_adapter(struct mwifiex_adapter *adapter)
 186 {
 187         struct mwifiex_opt_sleep_confirm *sleep_cfm_buf = NULL;
 188
 189         skb_put(adapter->sleep_cfm, sizeof(struct mwifiex_opt_sleep_confirm));
 190
 191         adapter->cmd_sent = false;
 192
 193         if (adapter->iface_type == MWIFIEX_SDIO)
 194                 adapter->data_sent = true;
 195         else
 196                 adapter->data_sent = false;
 197
 198         adapter->cmd_resp_received = false;
 199         adapter->event_received = false;
 200         adapter->data_received = false;
 201
 202         adapter->surprise_removed = false;
 203
 204         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 205
 206         adapter->ps_mode = MWIFIEX_802_11_POWER_MODE_CAM;
 207         adapter->ps_state = PS_STATE_AWAKE;
 208         adapter->need_to_wakeup = false;
 209
 210         adapter->scan_mode = HostCmd_BSS_MODE_ANY;
 211         adapter->specific_scan_time = MWIFIEX_SPECIFIC_SCAN_CHAN_TIME;
 212         adapter->active_scan_time = MWIFIEX_ACTIVE_SCAN_CHAN_TIME;
 213         adapter->passive_scan_time = MWIFIEX_PASSIVE_SCAN_CHAN_TIME;
 214
 215         adapter->scan_probes = 1;
 216
 217         adapter->multiple_dtim = 1;
 218
 219         adapter->local_listen_interval = 0;     /* default value in firmware
 220                                                    will be used */
 221
 222         adapter->is_deep_sleep = false;
 223
 224         adapter->delay_null_pkt = false;
 225         adapter->delay_to_ps = 1000;
 226         adapter->enhanced_ps_mode = PS_MODE_AUTO;
 227
 228         adapter->gen_null_pkt = false;  /* Disable NULL Pkg generation by
 229                                            default */
 230         adapter->pps_uapsd_mode = false; /* Disable pps/uapsd mode by
 231                                            default */
 232         adapter->pm_wakeup_card_req = false;
 233
 234         adapter->pm_wakeup_fw_try = false;
 235
 236         adapter->tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 237         adapter->curr_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 238
 239         adapter->is_hs_configured = false;
 240         adapter->hs_cfg.conditions = cpu_to_le32(HS_CFG_COND_DEF);
 241         adapter->hs_cfg.gpio = HS_CFG_GPIO_DEF;
 242         adapter->hs_cfg.gap = HS_CFG_GAP_DEF;
 243         adapter->hs_activated = false;
 244
 245         memset(adapter->event_body, 0, sizeof(adapter->event_body));
 246         adapter->hw_dot_11n_dev_cap = 0;
 247         adapter->hw_dev_mcs_support = 0;
 248         adapter->sec_chan_offset = 0;
 249         adapter->adhoc_11n_enabled = false;
 250
 251         mwifiex_wmm_init(adapter);
 252
 253         if (adapter->sleep_cfm) {
 254                 sleep_cfm_buf = (struct mwifiex_opt_sleep_confirm *)
 255                                                 adapter->sleep_cfm->data;
 256                 memset(sleep_cfm_buf, 0, adapter->sleep_cfm->len);
 257                 sleep_cfm_buf->command =
 258                                 cpu_to_le16(HostCmd_CMD_802_11_PS_MODE_ENH);
 259                 sleep_cfm_buf->size =
 260                                 cpu_to_le16(adapter->sleep_cfm->len);
 261                 sleep_cfm_buf->result = 0;
 262                 sleep_cfm_buf->action = cpu_to_le16(SLEEP_CONFIRM);
 263                 sleep_cfm_buf->resp_ctrl = cpu_to_le16(RESP_NEEDED);
 264         }
 265         memset(&adapter->sleep_params, 0, sizeof(adapter->sleep_params));
 266         memset(&adapter->sleep_period, 0, sizeof(adapter->sleep_period));
 267         adapter->tx_lock_flag = false;
 268         adapter->null_pkt_interval = 0;
 269         adapter->fw_bands = 0;
 270         adapter->config_bands = 0;
 271         adapter->adhoc_start_band = 0;
 272         adapter->scan_channels = NULL;
 273         adapter->fw_release_number = 0;
 274         adapter->fw_cap_info = 0;
 275         memset(&adapter->upld_buf, 0, sizeof(adapter->upld_buf));
 276         adapter->event_cause = 0;
 277         adapter->region_code = 0;
 278         adapter->bcn_miss_time_out = DEFAULT_BCN_MISS_TIMEOUT;
 279         adapter->adhoc_awake_period = 0;
 280         memset(&adapter->arp_filter, 0, sizeof(adapter->arp_filter));
 281         adapter->arp_filter_size = 0;
 282         adapter->max_mgmt_ie_index = MAX_MGMT_IE_INDEX;
 283         adapter->empty_tx_q_cnt = 0;
 284 }
 285
 286 /*
 287  * This function sets trans_start per tx_queue
 288  */
 289 void mwifiex_set_trans_start(struct net_device *dev)
 290 {
 291         int i;
 292
 293         for (i = 0; i < dev->num_tx_queues; i++)
 294                 netdev_get_tx_queue(dev, i)->trans_start = jiffies;
 295
 296         dev->trans_start = jiffies;
 297 }
 298
 299 /*
 300  * This function wakes up all queues in net_device
 301  */
 302 void mwifiex_wake_up_net_dev_queue(struct net_device *netdev,
 303                                         struct mwifiex_adapter *adapter)
 304 {
 305         unsigned long dev_queue_flags;
 306         unsigned int i;
 307
 308         spin_lock_irqsave(&adapter->queue_lock, dev_queue_flags);
 309
 310         for (i = 0; i < netdev->num_tx_queues; i++) {
 311                 struct netdev_queue *txq = netdev_get_tx_queue(netdev, i);
 312
 313                 if (netif_tx_queue_stopped(txq))
 314                         netif_tx_wake_queue(txq);
 315         }
 316
 317         spin_unlock_irqrestore(&adapter->queue_lock, dev_queue_flags);
 318 }
 319
 320 /*
 321  * This function stops all queues in net_device
 322  */
 323 void mwifiex_stop_net_dev_queue(struct net_device *netdev,
 324                                         struct mwifiex_adapter *adapter)
 325 {
 326         unsigned long dev_queue_flags;
 327         unsigned int i;
 328
 329         spin_lock_irqsave(&adapter->queue_lock, dev_queue_flags);
 330
 331         for (i = 0; i < netdev->num_tx_queues; i++) {
 332                 struct netdev_queue *txq = netdev_get_tx_queue(netdev, i);
 333
 334                 if (!netif_tx_queue_stopped(txq))
 335                         netif_tx_stop_queue(txq);
 336         }
 337
 338         spin_unlock_irqrestore(&adapter->queue_lock, dev_queue_flags);
 339 }
 340
 341 /*
 342  *  This function releases the lock variables and frees the locks and
 343  *  associated locks.
 344  */
 345 static void mwifiex_free_lock_list(struct mwifiex_adapter *adapter)
 346 {
 347         struct mwifiex_private *priv;
 348         s32 i, j;
 349
 350         /* Free lists */
 351         list_del(&adapter->cmd_free_q);
 352         list_del(&adapter->cmd_pending_q);
 353         list_del(&adapter->scan_pending_q);
 354
 355         for (i = 0; i < adapter->priv_num; i++)
 356                 list_del(&adapter->bss_prio_tbl[i].bss_prio_head);
 357
 358         for (i = 0; i < adapter->priv_num; i++) {
 359                 if (adapter->priv[i]) {
 360                         priv = adapter->priv[i];
 361                         for (j = 0; j < MAX_NUM_TID; ++j)
 362                                 list_del(&priv->wmm.tid_tbl_ptr[j].ra_list);
 363                         list_del(&priv->tx_ba_stream_tbl_ptr);
 364                         list_del(&priv->rx_reorder_tbl_ptr);
 365                         list_del(&priv->sta_list);
 366                 }
 367         }
 368 }
 369
 370 /*
 371  * This function performs cleanup for adapter structure.
 372  *
 373  * The cleanup is done recursively, by canceling all pending
 374  * commands, freeing the member buffers previously allocated
 375  * (command buffers, scan table buffer, sleep confirm command
 376  * buffer), stopping the timers and calling the cleanup routines
 377  * for every interface.
 378  */
 379 static void
 380 mwifiex_adapter_cleanup(struct mwifiex_adapter *adapter)
 381 {
 382         if (!adapter) {
 383                 pr_err("%s: adapter is NULL\n", __func__);
 384                 return;
 385         }
 386
 387         mwifiex_cancel_all_pending_cmd(adapter);
 388
 389         /* Free lock variables */
 390         mwifiex_free_lock_list(adapter);
 391
 392         /* Free command buffer */
 393         dev_dbg(adapter->dev, "info: free cmd buffer\n");
 394         mwifiex_free_cmd_buffer(adapter);
 395
 396         dev_dbg(adapter->dev, "info: free scan table\n");
 397
 398         if (adapter->sleep_cfm)
 399                 dev_kfree_skb_any(adapter->sleep_cfm);
 400 }
 401
 402 /*
 403  *  This function intializes the lock variables and
 404  *  the list heads.
 405  */
 406 int mwifiex_init_lock_list(struct mwifiex_adapter *adapter)
 407 {
 408         struct mwifiex_private *priv;
 409         s32 i, j;
 410
 411         spin_lock_init(&adapter->mwifiex_lock);
 412         spin_lock_init(&adapter->int_lock);
 413         spin_lock_init(&adapter->main_proc_lock);
 414         spin_lock_init(&adapter->mwifiex_cmd_lock);
 415         spin_lock_init(&adapter->queue_lock);
 416         for (i = 0; i < adapter->priv_num; i++) {
 417                 if (adapter->priv[i]) {
 418                         priv = adapter->priv[i];
 419                         spin_lock_init(&priv->rx_pkt_lock);
 420                         spin_lock_init(&priv->wmm.ra_list_spinlock);
 421                         spin_lock_init(&priv->curr_bcn_buf_lock);
 422                         spin_lock_init(&priv->sta_list_spinlock);
 423                 }
 424         }
 425
 426         /* Initialize cmd_free_q */
 427         INIT_LIST_HEAD(&adapter->cmd_free_q);
 428         /* Initialize cmd_pending_q */
 429         INIT_LIST_HEAD(&adapter->cmd_pending_q);
 430         /* Initialize scan_pending_q */
 431         INIT_LIST_HEAD(&adapter->scan_pending_q);
 432
 433         spin_lock_init(&adapter->cmd_free_q_lock);
 434         spin_lock_init(&adapter->cmd_pending_q_lock);
 435         spin_lock_init(&adapter->scan_pending_q_lock);
 436
 437         skb_queue_head_init(&adapter->usb_rx_data_q);
 438
 439         for (i = 0; i < adapter->priv_num; ++i) {
 440                 INIT_LIST_HEAD(&adapter->bss_prio_tbl[i].bss_prio_head);
 441                 spin_lock_init(&adapter->bss_prio_tbl[i].bss_prio_lock);
 442         }
 443
 444         for (i = 0; i < adapter->priv_num; i++) {
 445                 if (!adapter->priv[i])
 446                         continue;
 447                 priv = adapter->priv[i];
 448                 for (j = 0; j < MAX_NUM_TID; ++j)
 449                         INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[j].ra_list);
 450                 INIT_LIST_HEAD(&priv->tx_ba_stream_tbl_ptr);
 451                 INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
 452                 INIT_LIST_HEAD(&priv->sta_list);
 453
 454                 spin_lock_init(&priv->tx_ba_stream_tbl_lock);
 455                 spin_lock_init(&priv->rx_reorder_tbl_lock);
 456         }
 457
 458         return 0;
 459 }
 460
 461 /*
 462  * This function initializes the firmware.
 463  *
 464  * The following operations are performed sequentially -
 465  *      - Allocate adapter structure
 466  *      - Initialize the adapter structure
 467  *      - Initialize the private structure
 468  *      - Add BSS priority tables to the adapter structure
 469  *      - For each interface, send the init commands to firmware
 470  *      - Send the first command in command pending queue, if available
 471  */
 472 int mwifiex_init_fw(struct mwifiex_adapter *adapter)
 473 {
 474         int ret;
 475         struct mwifiex_private *priv;
 476         u8 i, first_sta = true;
 477         int is_cmd_pend_q_empty;
 478         unsigned long flags;
 479
 480         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 481
 482         /* Allocate memory for member of adapter structure */
 483         ret = mwifiex_allocate_adapter(adapter);
 484         if (ret)
 485                 return -1;
 486
 487         /* Initialize adapter structure */
 488         mwifiex_init_adapter(adapter);
 489
 490         for (i = 0; i < adapter->priv_num; i++) {
 491                 if (adapter->priv[i]) {
 492                         priv = adapter->priv[i];
 493
 494                         /* Initialize private structure */
 495                         ret = mwifiex_init_priv(priv);
 496                         if (ret)
 497                                 return -1;
 498                 }
 499         }
 500
 501         if (adapter->if_ops.init_fw_port) {
 502                 if (adapter->if_ops.init_fw_port(adapter))
 503                         return -1;
 504         }
 505
 506         for (i = 0; i < adapter->priv_num; i++) {
 507                 if (adapter->priv[i]) {
 508                         ret = mwifiex_sta_init_cmd(adapter->priv[i], first_sta);
 509                         if (ret == -1)
 510                                 return -1;
 511
 512                         first_sta = false;
 513                 }
 514         }
 515
 516         spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
 517         is_cmd_pend_q_empty = list_empty(&adapter->cmd_pending_q);
 518         spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);
 519         if (!is_cmd_pend_q_empty) {
 520                 /* Send the first command in queue and return */
 521                 if (mwifiex_main_process(adapter) != -1)
 522                         ret = -EINPROGRESS;
 523         } else {
 524                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 525         }
 526
 527         return ret;
 528 }
 529
 530 /*
 531  * This function deletes the BSS priority tables.
 532  *
 533  * The function traverses through all the allocated BSS priority nodes
 534  * in every BSS priority table and frees them.
 535  */
 536 static void mwifiex_delete_bss_prio_tbl(struct mwifiex_private *priv)
 537 {
 538         int i;
 539         struct mwifiex_adapter *adapter = priv->adapter;
 540         struct mwifiex_bss_prio_node *bssprio_node, *tmp_node;
 541         struct list_head *head;
 542         spinlock_t *lock; /* bss priority lock */
 543         unsigned long flags;
 544
 545         for (i = 0; i < adapter->priv_num; ++i) {
 546                 head = &adapter->bss_prio_tbl[i].bss_prio_head;
 547                 lock = &adapter->bss_prio_tbl[i].bss_prio_lock;
 548                 dev_dbg(adapter->dev, "info: delete BSS priority table,"
 549                                 " bss_type = %d, bss_num = %d, i = %d,"
 550                                 " head = %p\n",
 551                               priv->bss_type, priv->bss_num, i, head);
 552
 553                 {
 554                         spin_lock_irqsave(lock, flags);
 555                         if (list_empty(head)) {
 556                                 spin_unlock_irqrestore(lock, flags);
 557                                 continue;
 558                         }
 559                         list_for_each_entry_safe(bssprio_node, tmp_node, head,
 560                                                  list) {
 561                                 if (bssprio_node->priv == priv) {
 562                                         dev_dbg(adapter->dev, "info: Delete "
 563                                                 "node %p, next = %p\n",
 564                                                 bssprio_node, tmp_node);
 565                                         list_del(&bssprio_node->list);
 566                                         kfree(bssprio_node);
 567                                 }
 568                         }
 569                         spin_unlock_irqrestore(lock, flags);
 570                 }
 571         }
 572 }
 573
 574 /*
 575  * This function frees the private structure, including cleans
 576  * up the TX and RX queues and frees the BSS priority tables.
 577  */
 578 void mwifiex_free_priv(struct mwifiex_private *priv)
 579 {
 580         mwifiex_clean_txrx(priv);
 581         mwifiex_delete_bss_prio_tbl(priv);
 582         mwifiex_free_curr_bcn(priv);
 583 }
 584
 585 /*
 586  * This function is used to shutdown the driver.
 587  *
 588  * The following operations are performed sequentially -
 589  *      - Check if already shut down
 590  *      - Make sure the main process has stopped
 591  *      - Clean up the Tx and Rx queues
 592  *      - Delete BSS priority tables
 593  *      - Free the adapter
 594  *      - Notify completion
 595  */
 596 int
 597 mwifiex_shutdown_drv(struct mwifiex_adapter *adapter)
 598 {
 599         int ret = -EINPROGRESS;
 600         struct mwifiex_private *priv;
 601         s32 i;
 602         struct sk_buff *skb;
 603
 604         /* mwifiex already shutdown */
 605         if (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY)
 606                 return 0;
 607
 608         adapter->hw_status = MWIFIEX_HW_STATUS_CLOSING;
 609         /* wait for mwifiex_process to complete */
 610         if (adapter->mwifiex_processing) {
 611                 dev_warn(adapter->dev, "main process is still running\n");
 612                 return ret;
 613         }
 614
 615         /* cancel current command */
 616         if (adapter->curr_cmd) {
 617                 dev_warn(adapter->dev, "curr_cmd is still in processing\n");
 618                 del_timer(&adapter->cmd_timer);
 619                 mwifiex_recycle_cmd_node(adapter, adapter->curr_cmd);
 620                 adapter->curr_cmd = NULL;
 621         }
 622
 623         /* shut down mwifiex */
 624         dev_dbg(adapter->dev, "info: shutdown mwifiex...\n");
 625
 626         /* Clean up Tx/Rx queues and delete BSS priority table */
 627         for (i = 0; i < adapter->priv_num; i++) {
 628                 if (adapter->priv[i]) {
 629                         priv = adapter->priv[i];
 630
 631                         mwifiex_clean_txrx(priv);
 632                         mwifiex_delete_bss_prio_tbl(priv);
 633                 }
 634         }
 635
 636         spin_lock(&adapter->mwifiex_lock);
 637
 638         if (adapter->if_ops.data_complete) {
 639                 while ((skb = skb_dequeue(&adapter->usb_rx_data_q))) {
 640                         struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
 641
 642                         priv = adapter->priv[rx_info->bss_num];
 643                         if (priv)
 644                                 priv->stats.rx_dropped++;
 645
 646                         adapter->if_ops.data_complete(adapter, skb);
 647                 }
 648         }
 649
 650         mwifiex_adapter_cleanup(adapter);
 651
 652         spin_unlock(&adapter->mwifiex_lock);
 653
 654         /* Notify completion */
 655         ret = mwifiex_shutdown_fw_complete(adapter);
 656
 657         return ret;
 658 }
 659
 660 /*
 661  * This function downloads the firmware to the card.
 662  *
 663  * The actual download is preceded by two sanity checks -
 664  *      - Check if firmware is already running
 665  *      - Check if the interface is the winner to download the firmware
 666  *
 667  * ...and followed by another -
 668  *      - Check if the firmware is downloaded successfully
 669  *
 670  * After download is successfully completed, the host interrupts are enabled.
 671  */
 672 int mwifiex_dnld_fw(struct mwifiex_adapter *adapter,
 673                     struct mwifiex_fw_image *pmfw)
 674 {
 675         int ret;
 676         u32 poll_num = 1;
 677
 678         if (adapter->if_ops.check_fw_status) {
 679                 adapter->winner = 0;
 680
 681                 /* check if firmware is already running */
 682                 ret = adapter->if_ops.check_fw_status(adapter, poll_num);
 683                 if (!ret) {
 684                         dev_notice(adapter->dev,
 685                                    "WLAN FW already running! Skip FW dnld\n");
 686                         return 0;
 687                 }
 688
 689                 poll_num = MAX_FIRMWARE_POLL_TRIES;
 690
 691                 /* check if we are the winner for downloading FW */
 692                 if (!adapter->winner) {
 693                         dev_notice(adapter->dev,
 694                                    "FW already running! Skip FW dnld\n");
 695                         goto poll_fw;
 696                 }
 697         }
 698
 699         if (pmfw) {
 700                 /* Download firmware with helper */
 701                 ret = adapter->if_ops.prog_fw(adapter, pmfw);
 702                 if (ret) {
 703                         dev_err(adapter->dev, "prog_fw failed ret=%#x\n", ret);
 704                         return ret;
 705                 }
 706         }
 707
 708 poll_fw:
 709         /* Check if the firmware is downloaded successfully or not */
 710         ret = adapter->if_ops.check_fw_status(adapter, poll_num);
 711         if (ret)
 712                 dev_err(adapter->dev, "FW failed to be active in time\n");
 713
 714         return ret;
 715 }