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         unsigned long flags;
  39
  40         bss_prio = kzalloc(sizeof(struct mwifiex_bss_prio_node), GFP_KERNEL);
  41         if (!bss_prio) {
  42                 dev_err(adapter->dev, "%s: failed to alloc bss_prio\n",
  43                                                 __func__);
  44                 return -ENOMEM;
  45         }
  46
  47         bss_prio->priv = priv;
  48         INIT_LIST_HEAD(&bss_prio->list);
  49         if (!adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur)
  50                 adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur =
  51                         bss_prio;
  52
  53         spin_lock_irqsave(&adapter->bss_prio_tbl[priv->bss_priority]
  54                         .bss_prio_lock, flags);
  55         list_add_tail(&bss_prio->list,
  56                         &adapter->bss_prio_tbl[priv->bss_priority]
  57                         .bss_prio_head);
  58         spin_unlock_irqrestore(&adapter->bss_prio_tbl[priv->bss_priority]
  59                         .bss_prio_lock, flags);
  60
  61         return 0;
  62 }
  63
  64 /*
  65  * This function initializes the private structure and sets default
  66  * values to the members.
  67  *
  68  * Additionally, it also initializes all the locks and sets up all the
  69  * lists.
  70  */
  71 static int mwifiex_init_priv(struct mwifiex_private *priv)
  72 {
  73         u32 i;
  74
  75         priv->media_connected = false;
  76         memset(priv->curr_addr, 0xff, ETH_ALEN);
  77
  78         priv->pkt_tx_ctrl = 0;
  79         priv->bss_mode = NL80211_IFTYPE_UNSPECIFIED;
  80         priv->data_rate = 0;    /* Initially indicate the rate as auto */
  81         priv->is_data_rate_auto = true;
  82         priv->bcn_avg_factor = DEFAULT_BCN_AVG_FACTOR;
  83         priv->data_avg_factor = DEFAULT_DATA_AVG_FACTOR;
  84
  85         priv->sec_info.wep_status = MWIFIEX_802_11_WEP_DISABLED;
  86         priv->sec_info.authentication_mode = NL80211_AUTHTYPE_OPEN_SYSTEM;
  87         priv->sec_info.encryption_mode = 0;
  88         for (i = 0; i < ARRAY_SIZE(priv->wep_key); i++)
  89                 memset(&priv->wep_key[i], 0, sizeof(struct mwifiex_wep_key));
  90         priv->wep_key_curr_index = 0;
  91         priv->curr_pkt_filter = HostCmd_ACT_MAC_RX_ON | HostCmd_ACT_MAC_TX_ON |
  92                                 HostCmd_ACT_MAC_ETHERNETII_ENABLE;
  93
  94         priv->beacon_period = 100; /* beacon interval */ ;
  95         priv->attempted_bss_desc = NULL;
  96         memset(&priv->curr_bss_params, 0, sizeof(priv->curr_bss_params));
  97         priv->listen_interval = MWIFIEX_DEFAULT_LISTEN_INTERVAL;
  98
  99         memset(&priv->prev_ssid, 0, sizeof(priv->prev_ssid));
 100         memset(&priv->prev_bssid, 0, sizeof(priv->prev_bssid));
 101         memset(&priv->assoc_rsp_buf, 0, sizeof(priv->assoc_rsp_buf));
 102         priv->assoc_rsp_size = 0;
 103         priv->adhoc_channel = DEFAULT_AD_HOC_CHANNEL;
 104         priv->atim_window = 0;
 105         priv->adhoc_state = ADHOC_IDLE;
 106         priv->tx_power_level = 0;
 107         priv->max_tx_power_level = 0;
 108         priv->min_tx_power_level = 0;
 109         priv->tx_rate = 0;
 110         priv->rxpd_htinfo = 0;
 111         priv->rxpd_rate = 0;
 112         priv->rate_bitmap = 0;
 113         priv->data_rssi_last = 0;
 114         priv->data_rssi_avg = 0;
 115         priv->data_nf_avg = 0;
 116         priv->data_nf_last = 0;
 117         priv->bcn_rssi_last = 0;
 118         priv->bcn_rssi_avg = 0;
 119         priv->bcn_nf_avg = 0;
 120         priv->bcn_nf_last = 0;
 121         memset(&priv->wpa_ie, 0, sizeof(priv->wpa_ie));
 122         memset(&priv->aes_key, 0, sizeof(priv->aes_key));
 123         priv->wpa_ie_len = 0;
 124         priv->wpa_is_gtk_set = false;
 125
 126         memset(&priv->assoc_tlv_buf, 0, sizeof(priv->assoc_tlv_buf));
 127         priv->assoc_tlv_buf_len = 0;
 128         memset(&priv->wps, 0, sizeof(priv->wps));
 129         memset(&priv->gen_ie_buf, 0, sizeof(priv->gen_ie_buf));
 130         priv->gen_ie_buf_len = 0;
 131         memset(priv->vs_ie, 0, sizeof(priv->vs_ie));
 132
 133         priv->wmm_required = true;
 134         priv->wmm_enabled = false;
 135         priv->wmm_qosinfo = 0;
 136         priv->curr_bcn_buf = NULL;
 137         priv->curr_bcn_size = 0;
 138
 139         priv->scan_block = 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_PCIE)
 194                 adapter->data_sent = false;
 195         else
 196                 adapter->data_sent = true;
 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->max_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 237         adapter->tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 238         adapter->curr_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 239
 240         adapter->is_hs_configured = false;
 241         adapter->hs_cfg.conditions = cpu_to_le32(HOST_SLEEP_CFG_COND_DEF);
 242         adapter->hs_cfg.gpio = HOST_SLEEP_CFG_GPIO_DEF;
 243         adapter->hs_cfg.gap = HOST_SLEEP_CFG_GAP_DEF;
 244         adapter->hs_activated = false;
 245
 246         memset(adapter->event_body, 0, sizeof(adapter->event_body));
 247         adapter->hw_dot_11n_dev_cap = 0;
 248         adapter->hw_dev_mcs_support = 0;
 249         adapter->sec_chan_offset = 0;
 250         adapter->adhoc_11n_enabled = false;
 251
 252         mwifiex_wmm_init(adapter);
 253
 254         if (adapter->sleep_cfm) {
 255                 sleep_cfm_buf = (struct mwifiex_opt_sleep_confirm *)
 256                                                 adapter->sleep_cfm->data;
 257                 memset(sleep_cfm_buf, 0, adapter->sleep_cfm->len);
 258                 sleep_cfm_buf->command =
 259                                 cpu_to_le16(HostCmd_CMD_802_11_PS_MODE_ENH);
 260                 sleep_cfm_buf->size =
 261                                 cpu_to_le16(adapter->sleep_cfm->len);
 262                 sleep_cfm_buf->result = 0;
 263                 sleep_cfm_buf->action = cpu_to_le16(SLEEP_CONFIRM);
 264                 sleep_cfm_buf->resp_ctrl = cpu_to_le16(RESP_NEEDED);
 265         }
 266         memset(&adapter->sleep_params, 0, sizeof(adapter->sleep_params));
 267         memset(&adapter->sleep_period, 0, sizeof(adapter->sleep_period));
 268         adapter->tx_lock_flag = false;
 269         adapter->null_pkt_interval = 0;
 270         adapter->fw_bands = 0;
 271         adapter->config_bands = 0;
 272         adapter->adhoc_start_band = 0;
 273         adapter->scan_channels = NULL;
 274         adapter->fw_release_number = 0;
 275         adapter->fw_cap_info = 0;
 276         memset(&adapter->upld_buf, 0, sizeof(adapter->upld_buf));
 277         adapter->event_cause = 0;
 278         adapter->region_code = 0;
 279         adapter->bcn_miss_time_out = DEFAULT_BCN_MISS_TIMEOUT;
 280         adapter->adhoc_awake_period = 0;
 281         memset(&adapter->arp_filter, 0, sizeof(adapter->arp_filter));
 282         adapter->arp_filter_size = 0;
 283 }
 284
 285 /*
 286  * This function sets trans_start per tx_queue
 287  */
 288 void mwifiex_set_trans_start(struct net_device *dev)
 289 {
 290         int i;
 291
 292         for (i = 0; i < dev->num_tx_queues; i++)
 293                 netdev_get_tx_queue(dev, i)->trans_start = jiffies;
 294
 295         dev->trans_start = jiffies;
 296 }
 297
 298 /*
 299  * This function wakes up all queues in net_device
 300  */
 301 void mwifiex_wake_up_net_dev_queue(struct net_device *netdev,
 302                                         struct mwifiex_adapter *adapter)
 303 {
 304         unsigned long dev_queue_flags;
 305
 306         spin_lock_irqsave(&adapter->queue_lock, dev_queue_flags);
 307         netif_tx_wake_all_queues(netdev);
 308         spin_unlock_irqrestore(&adapter->queue_lock, dev_queue_flags);
 309 }
 310
 311 /*
 312  * This function stops all queues in net_device
 313  */
 314 void mwifiex_stop_net_dev_queue(struct net_device *netdev,
 315                                         struct mwifiex_adapter *adapter)
 316 {
 317         unsigned long dev_queue_flags;
 318
 319         spin_lock_irqsave(&adapter->queue_lock, dev_queue_flags);
 320         netif_tx_stop_all_queues(netdev);
 321         spin_unlock_irqrestore(&adapter->queue_lock, dev_queue_flags);
 322 }
 323
 324 /*
 325  *  This function releases the lock variables and frees the locks and
 326  *  associated locks.
 327  */
 328 static void mwifiex_free_lock_list(struct mwifiex_adapter *adapter)
 329 {
 330         struct mwifiex_private *priv;
 331         s32 i, j;
 332
 333         /* Free lists */
 334         list_del(&adapter->cmd_free_q);
 335         list_del(&adapter->cmd_pending_q);
 336         list_del(&adapter->scan_pending_q);
 337
 338         for (i = 0; i < adapter->priv_num; i++)
 339                 list_del(&adapter->bss_prio_tbl[i].bss_prio_head);
 340
 341         for (i = 0; i < adapter->priv_num; i++) {
 342                 if (adapter->priv[i]) {
 343                         priv = adapter->priv[i];
 344                         for (j = 0; j < MAX_NUM_TID; ++j)
 345                                 list_del(&priv->wmm.tid_tbl_ptr[j].ra_list);
 346                         list_del(&priv->tx_ba_stream_tbl_ptr);
 347                         list_del(&priv->rx_reorder_tbl_ptr);
 348                 }
 349         }
 350 }
 351
 352 /*
 353  * This function frees the adapter structure.
 354  *
 355  * The freeing operation is done recursively, by canceling all
 356  * pending commands, freeing the member buffers previously
 357  * allocated (command buffers, scan table buffer, sleep confirm
 358  * command buffer), stopping the timers and calling the cleanup
 359  * routines for every interface, before the actual adapter
 360  * structure is freed.
 361  */
 362 static void
 363 mwifiex_free_adapter(struct mwifiex_adapter *adapter)
 364 {
 365         if (!adapter) {
 366                 pr_err("%s: adapter is NULL\n", __func__);
 367                 return;
 368         }
 369
 370         mwifiex_cancel_all_pending_cmd(adapter);
 371
 372         /* Free lock variables */
 373         mwifiex_free_lock_list(adapter);
 374
 375         /* Free command buffer */
 376         dev_dbg(adapter->dev, "info: free cmd buffer\n");
 377         mwifiex_free_cmd_buffer(adapter);
 378
 379         del_timer(&adapter->cmd_timer);
 380
 381         dev_dbg(adapter->dev, "info: free scan table\n");
 382
 383         adapter->if_ops.cleanup_if(adapter);
 384
 385         if (adapter->sleep_cfm)
 386                 dev_kfree_skb_any(adapter->sleep_cfm);
 387 }
 388
 389 /*
 390  *  This function intializes the lock variables and
 391  *  the list heads.
 392  */
 393 int mwifiex_init_lock_list(struct mwifiex_adapter *adapter)
 394 {
 395         struct mwifiex_private *priv;
 396         s32 i, j;
 397
 398         spin_lock_init(&adapter->mwifiex_lock);
 399         spin_lock_init(&adapter->int_lock);
 400         spin_lock_init(&adapter->main_proc_lock);
 401         spin_lock_init(&adapter->mwifiex_cmd_lock);
 402         spin_lock_init(&adapter->queue_lock);
 403         for (i = 0; i < adapter->priv_num; i++) {
 404                 if (adapter->priv[i]) {
 405                         priv = adapter->priv[i];
 406                         spin_lock_init(&priv->rx_pkt_lock);
 407                         spin_lock_init(&priv->wmm.ra_list_spinlock);
 408                         spin_lock_init(&priv->curr_bcn_buf_lock);
 409                 }
 410         }
 411
 412         /* Initialize cmd_free_q */
 413         INIT_LIST_HEAD(&adapter->cmd_free_q);
 414         /* Initialize cmd_pending_q */
 415         INIT_LIST_HEAD(&adapter->cmd_pending_q);
 416         /* Initialize scan_pending_q */
 417         INIT_LIST_HEAD(&adapter->scan_pending_q);
 418
 419         spin_lock_init(&adapter->cmd_free_q_lock);
 420         spin_lock_init(&adapter->cmd_pending_q_lock);
 421         spin_lock_init(&adapter->scan_pending_q_lock);
 422
 423         for (i = 0; i < adapter->priv_num; ++i) {
 424                 INIT_LIST_HEAD(&adapter->bss_prio_tbl[i].bss_prio_head);
 425                 adapter->bss_prio_tbl[i].bss_prio_cur = NULL;
 426                 spin_lock_init(&adapter->bss_prio_tbl[i].bss_prio_lock);
 427         }
 428
 429         for (i = 0; i < adapter->priv_num; i++) {
 430                 if (!adapter->priv[i])
 431                         continue;
 432                 priv = adapter->priv[i];
 433                 for (j = 0; j < MAX_NUM_TID; ++j) {
 434                         INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[j].ra_list);
 435                         spin_lock_init(&priv->wmm.tid_tbl_ptr[j].tid_tbl_lock);
 436                 }
 437                 INIT_LIST_HEAD(&priv->tx_ba_stream_tbl_ptr);
 438                 INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
 439
 440                 spin_lock_init(&priv->tx_ba_stream_tbl_lock);
 441                 spin_lock_init(&priv->rx_reorder_tbl_lock);
 442         }
 443
 444         return 0;
 445 }
 446
 447 /*
 448  * This function initializes the firmware.
 449  *
 450  * The following operations are performed sequentially -
 451  *      - Allocate adapter structure
 452  *      - Initialize the adapter structure
 453  *      - Initialize the private structure
 454  *      - Add BSS priority tables to the adapter structure
 455  *      - For each interface, send the init commands to firmware
 456  *      - Send the first command in command pending queue, if available
 457  */
 458 int mwifiex_init_fw(struct mwifiex_adapter *adapter)
 459 {
 460         int ret;
 461         struct mwifiex_private *priv;
 462         u8 i, first_sta = true;
 463         int is_cmd_pend_q_empty;
 464         unsigned long flags;
 465
 466         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 467
 468         /* Allocate memory for member of adapter structure */
 469         ret = mwifiex_allocate_adapter(adapter);
 470         if (ret)
 471                 return -1;
 472
 473         /* Initialize adapter structure */
 474         mwifiex_init_adapter(adapter);
 475
 476         for (i = 0; i < adapter->priv_num; i++) {
 477                 if (adapter->priv[i]) {
 478                         priv = adapter->priv[i];
 479
 480                         /* Initialize private structure */
 481                         ret = mwifiex_init_priv(priv);
 482                         if (ret)
 483                                 return -1;
 484                 }
 485         }
 486         for (i = 0; i < adapter->priv_num; i++) {
 487                 if (adapter->priv[i]) {
 488                         ret = mwifiex_sta_init_cmd(adapter->priv[i], first_sta);
 489                         if (ret == -1)
 490                                 return -1;
 491
 492                         first_sta = false;
 493                 }
 494         }
 495
 496         spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
 497         is_cmd_pend_q_empty = list_empty(&adapter->cmd_pending_q);
 498         spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);
 499         if (!is_cmd_pend_q_empty) {
 500                 /* Send the first command in queue and return */
 501                 if (mwifiex_main_process(adapter) != -1)
 502                         ret = -EINPROGRESS;
 503         } else {
 504                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 505         }
 506
 507         return ret;
 508 }
 509
 510 /*
 511  * This function deletes the BSS priority tables.
 512  *
 513  * The function traverses through all the allocated BSS priority nodes
 514  * in every BSS priority table and frees them.
 515  */
 516 static void mwifiex_delete_bss_prio_tbl(struct mwifiex_private *priv)
 517 {
 518         int i;
 519         struct mwifiex_adapter *adapter = priv->adapter;
 520         struct mwifiex_bss_prio_node *bssprio_node, *tmp_node, **cur;
 521         struct list_head *head;
 522         spinlock_t *lock;
 523         unsigned long flags;
 524
 525         for (i = 0; i < adapter->priv_num; ++i) {
 526                 head = &adapter->bss_prio_tbl[i].bss_prio_head;
 527                 cur = &adapter->bss_prio_tbl[i].bss_prio_cur;
 528                 lock = &adapter->bss_prio_tbl[i].bss_prio_lock;
 529                 dev_dbg(adapter->dev, "info: delete BSS priority table,"
 530                                 " index = %d, i = %d, head = %p, cur = %p\n",
 531                               priv->bss_index, i, head, *cur);
 532                 if (*cur) {
 533                         spin_lock_irqsave(lock, flags);
 534                         if (list_empty(head)) {
 535                                 spin_unlock_irqrestore(lock, flags);
 536                                 continue;
 537                         }
 538                         bssprio_node = list_first_entry(head,
 539                                         struct mwifiex_bss_prio_node, list);
 540                         spin_unlock_irqrestore(lock, flags);
 541
 542                         list_for_each_entry_safe(bssprio_node, tmp_node, head,
 543                                                  list) {
 544                                 if (bssprio_node->priv == priv) {
 545                                         dev_dbg(adapter->dev, "info: Delete "
 546                                                 "node %p, next = %p\n",
 547                                                 bssprio_node, tmp_node);
 548                                         spin_lock_irqsave(lock, flags);
 549                                         list_del(&bssprio_node->list);
 550                                         spin_unlock_irqrestore(lock, flags);
 551                                         kfree(bssprio_node);
 552                                 }
 553                         }
 554                         *cur = (struct mwifiex_bss_prio_node *)head;
 555                 }
 556         }
 557 }
 558
 559 /*
 560  * This function is used to shutdown the driver.
 561  *
 562  * The following operations are performed sequentially -
 563  *      - Check if already shut down
 564  *      - Make sure the main process has stopped
 565  *      - Clean up the Tx and Rx queues
 566  *      - Delete BSS priority tables
 567  *      - Free the adapter
 568  *      - Notify completion
 569  */
 570 int
 571 mwifiex_shutdown_drv(struct mwifiex_adapter *adapter)
 572 {
 573         int ret = -EINPROGRESS;
 574         struct mwifiex_private *priv;
 575         s32 i;
 576         unsigned long flags;
 577
 578         /* mwifiex already shutdown */
 579         if (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY)
 580                 return 0;
 581
 582         adapter->hw_status = MWIFIEX_HW_STATUS_CLOSING;
 583         /* wait for mwifiex_process to complete */
 584         if (adapter->mwifiex_processing) {
 585                 dev_warn(adapter->dev, "main process is still running\n");
 586                 return ret;
 587         }
 588
 589         /* shut down mwifiex */
 590         dev_dbg(adapter->dev, "info: shutdown mwifiex...\n");
 591
 592         /* Clean up Tx/Rx queues and delete BSS priority table */
 593         for (i = 0; i < adapter->priv_num; i++) {
 594                 if (adapter->priv[i]) {
 595                         priv = adapter->priv[i];
 596
 597                         mwifiex_clean_txrx(priv);
 598                         mwifiex_delete_bss_prio_tbl(priv);
 599                 }
 600         }
 601
 602         spin_lock_irqsave(&adapter->mwifiex_lock, flags);
 603
 604         /* Free adapter structure */
 605         mwifiex_free_adapter(adapter);
 606
 607         spin_unlock_irqrestore(&adapter->mwifiex_lock, flags);
 608
 609         /* Notify completion */
 610         ret = mwifiex_shutdown_fw_complete(adapter);
 611
 612         return ret;
 613 }
 614
 615 /*
 616  * This function downloads the firmware to the card.
 617  *
 618  * The actual download is preceded by two sanity checks -
 619  *      - Check if firmware is already running
 620  *      - Check if the interface is the winner to download the firmware
 621  *
 622  * ...and followed by another -
 623  *      - Check if the firmware is downloaded successfully
 624  *
 625  * After download is successfully completed, the host interrupts are enabled.
 626  */
 627 int mwifiex_dnld_fw(struct mwifiex_adapter *adapter,
 628                     struct mwifiex_fw_image *pmfw)
 629 {
 630         int ret;
 631         u32 poll_num = 1;
 632
 633         adapter->winner = 0;
 634
 635         /* Check if firmware is already running */
 636         ret = adapter->if_ops.check_fw_status(adapter, poll_num);
 637         if (!ret) {
 638                 dev_notice(adapter->dev,
 639                                 "WLAN FW already running! Skip FW download\n");
 640                 goto done;
 641         }
 642         poll_num = MAX_FIRMWARE_POLL_TRIES;
 643
 644         /* Check if we are the winner for downloading FW */
 645         if (!adapter->winner) {
 646                 dev_notice(adapter->dev,
 647                                 "Other interface already running!"
 648                                 " Skip FW download\n");
 649                 poll_num = MAX_MULTI_INTERFACE_POLL_TRIES;
 650                 goto poll_fw;
 651         }
 652         if (pmfw) {
 653                 /* Download firmware with helper */
 654                 ret = adapter->if_ops.prog_fw(adapter, pmfw);
 655                 if (ret) {
 656                         dev_err(adapter->dev, "prog_fw failed ret=%#x\n", ret);
 657                         return ret;
 658                 }
 659         }
 660
 661 poll_fw:
 662         /* Check if the firmware is downloaded successfully or not */
 663         ret = adapter->if_ops.check_fw_status(adapter, poll_num);
 664         if (ret) {
 665                 dev_err(adapter->dev, "FW failed to be active in time\n");
 666                 return -1;
 667         }
 668 done:
 669         /* re-enable host interrupt for mwifiex after fw dnld is successful */
 670         adapter->if_ops.enable_int(adapter);
 671         return ret;
 672 }