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_STATION;
  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         sleep_cfm_buf = (struct mwifiex_opt_sleep_confirm *)
 191                                                 (adapter->sleep_cfm->data);
 192
 193         adapter->cmd_sent = false;
 194         adapter->data_sent = true;
 195         adapter->cmd_resp_received = false;
 196         adapter->event_received = false;
 197         adapter->data_received = false;
 198
 199         adapter->surprise_removed = false;
 200
 201         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 202
 203         adapter->ps_mode = MWIFIEX_802_11_POWER_MODE_CAM;
 204         adapter->ps_state = PS_STATE_AWAKE;
 205         adapter->need_to_wakeup = false;
 206
 207         adapter->scan_mode = HostCmd_BSS_MODE_ANY;
 208         adapter->specific_scan_time = MWIFIEX_SPECIFIC_SCAN_CHAN_TIME;
 209         adapter->active_scan_time = MWIFIEX_ACTIVE_SCAN_CHAN_TIME;
 210         adapter->passive_scan_time = MWIFIEX_PASSIVE_SCAN_CHAN_TIME;
 211
 212         adapter->scan_probes = 1;
 213
 214         adapter->multiple_dtim = 1;
 215
 216         adapter->local_listen_interval = 0;     /* default value in firmware
 217                                                    will be used */
 218
 219         adapter->is_deep_sleep = false;
 220
 221         adapter->delay_null_pkt = false;
 222         adapter->delay_to_ps = 1000;
 223         adapter->enhanced_ps_mode = PS_MODE_AUTO;
 224
 225         adapter->gen_null_pkt = false;  /* Disable NULL Pkg generation by
 226                                            default */
 227         adapter->pps_uapsd_mode = false; /* Disable pps/uapsd mode by
 228                                            default */
 229         adapter->pm_wakeup_card_req = false;
 230
 231         adapter->pm_wakeup_fw_try = false;
 232
 233         adapter->max_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 234         adapter->tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 235         adapter->curr_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 236
 237         adapter->is_hs_configured = false;
 238         adapter->hs_cfg.conditions = cpu_to_le32(HOST_SLEEP_CFG_COND_DEF);
 239         adapter->hs_cfg.gpio = HOST_SLEEP_CFG_GPIO_DEF;
 240         adapter->hs_cfg.gap = HOST_SLEEP_CFG_GAP_DEF;
 241         adapter->hs_activated = false;
 242
 243         memset(adapter->event_body, 0, sizeof(adapter->event_body));
 244         adapter->hw_dot_11n_dev_cap = 0;
 245         adapter->hw_dev_mcs_support = 0;
 246         adapter->chan_offset = 0;
 247         adapter->adhoc_11n_enabled = false;
 248
 249         mwifiex_wmm_init(adapter);
 250
 251         if (adapter->sleep_cfm) {
 252                 memset(sleep_cfm_buf, 0, adapter->sleep_cfm->len);
 253                 sleep_cfm_buf->command =
 254                                 cpu_to_le16(HostCmd_CMD_802_11_PS_MODE_ENH);
 255                 sleep_cfm_buf->size =
 256                                 cpu_to_le16(adapter->sleep_cfm->len);
 257                 sleep_cfm_buf->result = 0;
 258                 sleep_cfm_buf->action = cpu_to_le16(SLEEP_CONFIRM);
 259                 sleep_cfm_buf->resp_ctrl = cpu_to_le16(RESP_NEEDED);
 260         }
 261         memset(&adapter->sleep_params, 0, sizeof(adapter->sleep_params));
 262         memset(&adapter->sleep_period, 0, sizeof(adapter->sleep_period));
 263         adapter->tx_lock_flag = false;
 264         adapter->null_pkt_interval = 0;
 265         adapter->fw_bands = 0;
 266         adapter->config_bands = 0;
 267         adapter->adhoc_start_band = 0;
 268         adapter->scan_channels = NULL;
 269         adapter->fw_release_number = 0;
 270         adapter->fw_cap_info = 0;
 271         memset(&adapter->upld_buf, 0, sizeof(adapter->upld_buf));
 272         adapter->event_cause = 0;
 273         adapter->region_code = 0;
 274         adapter->bcn_miss_time_out = DEFAULT_BCN_MISS_TIMEOUT;
 275         adapter->adhoc_awake_period = 0;
 276         memset(&adapter->arp_filter, 0, sizeof(adapter->arp_filter));
 277         adapter->arp_filter_size = 0;
 278 }
 279
 280 /*
 281  * This function frees the adapter structure.
 282  *
 283  * The freeing operation is done recursively, by canceling all
 284  * pending commands, freeing the member buffers previously
 285  * allocated (command buffers, scan table buffer, sleep confirm
 286  * command buffer), stopping the timers and calling the cleanup
 287  * routines for every interface, before the actual adapter
 288  * structure is freed.
 289  */
 290 static void
 291 mwifiex_free_adapter(struct mwifiex_adapter *adapter)
 292 {
 293         if (!adapter) {
 294                 pr_err("%s: adapter is NULL\n", __func__);
 295                 return;
 296         }
 297
 298         mwifiex_cancel_all_pending_cmd(adapter);
 299
 300         /* Free lock variables */
 301         mwifiex_free_lock_list(adapter);
 302
 303         /* Free command buffer */
 304         dev_dbg(adapter->dev, "info: free cmd buffer\n");
 305         mwifiex_free_cmd_buffer(adapter);
 306
 307         del_timer(&adapter->cmd_timer);
 308
 309         dev_dbg(adapter->dev, "info: free scan table\n");
 310
 311         adapter->if_ops.cleanup_if(adapter);
 312
 313         dev_kfree_skb_any(adapter->sleep_cfm);
 314 }
 315
 316 /*
 317  *  This function intializes the lock variables and
 318  *  the list heads.
 319  */
 320 int mwifiex_init_lock_list(struct mwifiex_adapter *adapter)
 321 {
 322         struct mwifiex_private *priv;
 323         s32 i, j;
 324
 325         spin_lock_init(&adapter->mwifiex_lock);
 326         spin_lock_init(&adapter->int_lock);
 327         spin_lock_init(&adapter->main_proc_lock);
 328         spin_lock_init(&adapter->mwifiex_cmd_lock);
 329         for (i = 0; i < adapter->priv_num; i++) {
 330                 if (adapter->priv[i]) {
 331                         priv = adapter->priv[i];
 332                         spin_lock_init(&priv->rx_pkt_lock);
 333                         spin_lock_init(&priv->wmm.ra_list_spinlock);
 334                         spin_lock_init(&priv->curr_bcn_buf_lock);
 335                 }
 336         }
 337
 338         /* Initialize cmd_free_q */
 339         INIT_LIST_HEAD(&adapter->cmd_free_q);
 340         /* Initialize cmd_pending_q */
 341         INIT_LIST_HEAD(&adapter->cmd_pending_q);
 342         /* Initialize scan_pending_q */
 343         INIT_LIST_HEAD(&adapter->scan_pending_q);
 344
 345         spin_lock_init(&adapter->cmd_free_q_lock);
 346         spin_lock_init(&adapter->cmd_pending_q_lock);
 347         spin_lock_init(&adapter->scan_pending_q_lock);
 348
 349         for (i = 0; i < adapter->priv_num; ++i) {
 350                 INIT_LIST_HEAD(&adapter->bss_prio_tbl[i].bss_prio_head);
 351                 adapter->bss_prio_tbl[i].bss_prio_cur = NULL;
 352                 spin_lock_init(&adapter->bss_prio_tbl[i].bss_prio_lock);
 353         }
 354
 355         for (i = 0; i < adapter->priv_num; i++) {
 356                 if (!adapter->priv[i])
 357                         continue;
 358                 priv = adapter->priv[i];
 359                 for (j = 0; j < MAX_NUM_TID; ++j) {
 360                         INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[j].ra_list);
 361                         spin_lock_init(&priv->wmm.tid_tbl_ptr[j].tid_tbl_lock);
 362                 }
 363                 INIT_LIST_HEAD(&priv->tx_ba_stream_tbl_ptr);
 364                 INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
 365
 366                 spin_lock_init(&priv->tx_ba_stream_tbl_lock);
 367                 spin_lock_init(&priv->rx_reorder_tbl_lock);
 368         }
 369
 370         return 0;
 371 }
 372
 373 /*
 374  *  This function releases the lock variables and frees the locks and
 375  *  associated locks.
 376  */
 377 void mwifiex_free_lock_list(struct mwifiex_adapter *adapter)
 378 {
 379         struct mwifiex_private *priv;
 380         s32 i, j;
 381
 382         /* Free lists */
 383         list_del(&adapter->cmd_free_q);
 384         list_del(&adapter->cmd_pending_q);
 385         list_del(&adapter->scan_pending_q);
 386
 387         for (i = 0; i < adapter->priv_num; i++)
 388                 list_del(&adapter->bss_prio_tbl[i].bss_prio_head);
 389
 390         for (i = 0; i < adapter->priv_num; i++) {
 391                 if (adapter->priv[i]) {
 392                         priv = adapter->priv[i];
 393                         for (j = 0; j < MAX_NUM_TID; ++j)
 394                                 list_del(&priv->wmm.tid_tbl_ptr[j].ra_list);
 395                         list_del(&priv->tx_ba_stream_tbl_ptr);
 396                         list_del(&priv->rx_reorder_tbl_ptr);
 397                 }
 398         }
 399 }
 400
 401 /*
 402  * This function initializes the firmware.
 403  *
 404  * The following operations are performed sequentially -
 405  *      - Allocate adapter structure
 406  *      - Initialize the adapter structure
 407  *      - Initialize the private structure
 408  *      - Add BSS priority tables to the adapter structure
 409  *      - For each interface, send the init commands to firmware
 410  *      - Send the first command in command pending queue, if available
 411  */
 412 int mwifiex_init_fw(struct mwifiex_adapter *adapter)
 413 {
 414         int ret;
 415         struct mwifiex_private *priv;
 416         u8 i, first_sta = true;
 417         int is_cmd_pend_q_empty;
 418         unsigned long flags;
 419
 420         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 421
 422         /* Allocate memory for member of adapter structure */
 423         ret = mwifiex_allocate_adapter(adapter);
 424         if (ret)
 425                 return -1;
 426
 427         /* Initialize adapter structure */
 428         mwifiex_init_adapter(adapter);
 429
 430         for (i = 0; i < adapter->priv_num; i++) {
 431                 if (adapter->priv[i]) {
 432                         priv = adapter->priv[i];
 433
 434                         /* Initialize private structure */
 435                         ret = mwifiex_init_priv(priv);
 436                         if (ret)
 437                                 return -1;
 438                 }
 439         }
 440         for (i = 0; i < adapter->priv_num; i++) {
 441                 if (adapter->priv[i]) {
 442                         ret = mwifiex_sta_init_cmd(adapter->priv[i], first_sta);
 443                         if (ret == -1)
 444                                 return -1;
 445
 446                         first_sta = false;
 447                 }
 448         }
 449
 450         spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
 451         is_cmd_pend_q_empty = list_empty(&adapter->cmd_pending_q);
 452         spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);
 453         if (!is_cmd_pend_q_empty) {
 454                 /* Send the first command in queue and return */
 455                 if (mwifiex_main_process(adapter) != -1)
 456                         ret = -EINPROGRESS;
 457         } else {
 458                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 459         }
 460
 461         return ret;
 462 }
 463
 464 /*
 465  * This function deletes the BSS priority tables.
 466  *
 467  * The function traverses through all the allocated BSS priority nodes
 468  * in every BSS priority table and frees them.
 469  */
 470 static void mwifiex_delete_bss_prio_tbl(struct mwifiex_private *priv)
 471 {
 472         int i;
 473         struct mwifiex_adapter *adapter = priv->adapter;
 474         struct mwifiex_bss_prio_node *bssprio_node, *tmp_node, **cur;
 475         struct list_head *head;
 476         spinlock_t *lock;
 477         unsigned long flags;
 478
 479         for (i = 0; i < adapter->priv_num; ++i) {
 480                 head = &adapter->bss_prio_tbl[i].bss_prio_head;
 481                 cur = &adapter->bss_prio_tbl[i].bss_prio_cur;
 482                 lock = &adapter->bss_prio_tbl[i].bss_prio_lock;
 483                 dev_dbg(adapter->dev, "info: delete BSS priority table,"
 484                                 " index = %d, i = %d, head = %p, cur = %p\n",
 485                               priv->bss_index, i, head, *cur);
 486                 if (*cur) {
 487                         spin_lock_irqsave(lock, flags);
 488                         if (list_empty(head)) {
 489                                 spin_unlock_irqrestore(lock, flags);
 490                                 continue;
 491                         }
 492                         bssprio_node = list_first_entry(head,
 493                                         struct mwifiex_bss_prio_node, list);
 494                         spin_unlock_irqrestore(lock, flags);
 495
 496                         list_for_each_entry_safe(bssprio_node, tmp_node, head,
 497                                                  list) {
 498                                 if (bssprio_node->priv == priv) {
 499                                         dev_dbg(adapter->dev, "info: Delete "
 500                                                 "node %p, next = %p\n",
 501                                                 bssprio_node, tmp_node);
 502                                         spin_lock_irqsave(lock, flags);
 503                                         list_del(&bssprio_node->list);
 504                                         spin_unlock_irqrestore(lock, flags);
 505                                         kfree(bssprio_node);
 506                                 }
 507                         }
 508                         *cur = (struct mwifiex_bss_prio_node *)head;
 509                 }
 510         }
 511 }
 512
 513 /*
 514  * This function is used to shutdown the driver.
 515  *
 516  * The following operations are performed sequentially -
 517  *      - Check if already shut down
 518  *      - Make sure the main process has stopped
 519  *      - Clean up the Tx and Rx queues
 520  *      - Delete BSS priority tables
 521  *      - Free the adapter
 522  *      - Notify completion
 523  */
 524 int
 525 mwifiex_shutdown_drv(struct mwifiex_adapter *adapter)
 526 {
 527         int ret = -EINPROGRESS;
 528         struct mwifiex_private *priv;
 529         s32 i;
 530         unsigned long flags;
 531
 532         /* mwifiex already shutdown */
 533         if (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY)
 534                 return 0;
 535
 536         adapter->hw_status = MWIFIEX_HW_STATUS_CLOSING;
 537         /* wait for mwifiex_process to complete */
 538         if (adapter->mwifiex_processing) {
 539                 dev_warn(adapter->dev, "main process is still running\n");
 540                 return ret;
 541         }
 542
 543         /* shut down mwifiex */
 544         dev_dbg(adapter->dev, "info: shutdown mwifiex...\n");
 545
 546         /* Clean up Tx/Rx queues and delete BSS priority table */
 547         for (i = 0; i < adapter->priv_num; i++) {
 548                 if (adapter->priv[i]) {
 549                         priv = adapter->priv[i];
 550
 551                         mwifiex_clean_txrx(priv);
 552                         mwifiex_delete_bss_prio_tbl(priv);
 553                 }
 554         }
 555
 556         spin_lock_irqsave(&adapter->mwifiex_lock, flags);
 557
 558         /* Free adapter structure */
 559         mwifiex_free_adapter(adapter);
 560
 561         spin_unlock_irqrestore(&adapter->mwifiex_lock, flags);
 562
 563         /* Notify completion */
 564         ret = mwifiex_shutdown_fw_complete(adapter);
 565
 566         return ret;
 567 }
 568
 569 /*
 570  * This function downloads the firmware to the card.
 571  *
 572  * The actual download is preceded by two sanity checks -
 573  *      - Check if firmware is already running
 574  *      - Check if the interface is the winner to download the firmware
 575  *
 576  * ...and followed by another -
 577  *      - Check if the firmware is downloaded successfully
 578  *
 579  * After download is successfully completed, the host interrupts are enabled.
 580  */
 581 int mwifiex_dnld_fw(struct mwifiex_adapter *adapter,
 582                     struct mwifiex_fw_image *pmfw)
 583 {
 584         int ret, winner;
 585         u32 poll_num = 1;
 586
 587         /* Check if firmware is already running */
 588         ret = adapter->if_ops.check_fw_status(adapter, poll_num, &winner);
 589         if (!ret) {
 590                 dev_notice(adapter->dev,
 591                                 "WLAN FW already running! Skip FW download\n");
 592                 goto done;
 593         }
 594         poll_num = MAX_FIRMWARE_POLL_TRIES;
 595
 596         /* Check if we are the winner for downloading FW */
 597         if (!winner) {
 598                 dev_notice(adapter->dev,
 599                                 "Other interface already running!"
 600                                 " Skip FW download\n");
 601                 poll_num = MAX_MULTI_INTERFACE_POLL_TRIES;
 602                 goto poll_fw;
 603         }
 604         if (pmfw) {
 605                 /* Download firmware with helper */
 606                 ret = adapter->if_ops.prog_fw(adapter, pmfw);
 607                 if (ret) {
 608                         dev_err(adapter->dev, "prog_fw failed ret=%#x\n", ret);
 609                         return ret;
 610                 }
 611         }
 612
 613 poll_fw:
 614         /* Check if the firmware is downloaded successfully or not */
 615         ret = adapter->if_ops.check_fw_status(adapter, poll_num, NULL);
 616         if (ret) {
 617                 dev_err(adapter->dev, "FW failed to be active in time\n");
 618                 return -1;
 619         }
 620 done:
 621         /* re-enable host interrupt for mwifiex after fw dnld is successful */
 622         adapter->if_ops.enable_int(adapter);
 623         return ret;
 624 }