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         if (!tbl[priv->bss_priority].bss_prio_cur)
  48                 tbl[priv->bss_priority].bss_prio_cur = bss_prio;
  49
  50         spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
  51         list_add_tail(&bss_prio->list, &tbl[priv->bss_priority].bss_prio_head);
  52         spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);
  53
  54         return 0;
  55 }
  56
  57 static void scan_delay_timer_fn(unsigned long data)
  58 {
  59         struct mwifiex_private *priv = (struct mwifiex_private *)data;
  60         struct mwifiex_adapter *adapter = priv->adapter;
  61         struct cmd_ctrl_node *cmd_node, *tmp_node;
  62         unsigned long flags;
  63
  64         if (adapter->scan_delay_cnt == MWIFIEX_MAX_SCAN_DELAY_CNT) {
  65                 /*
  66                  * Abort scan operation by cancelling all pending scan
  67                  * commands
  68                  */
  69                 spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
  70                 list_for_each_entry_safe(cmd_node, tmp_node,
  71                                          &adapter->scan_pending_q, list) {
  72                         list_del(&cmd_node->list);
  73                         mwifiex_insert_cmd_to_free_q(adapter, cmd_node);
  74                 }
  75                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
  76
  77                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
  78                 adapter->scan_processing = false;
  79                 adapter->scan_delay_cnt = 0;
  80                 adapter->empty_tx_q_cnt = 0;
  81                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
  82
  83                 if (priv->user_scan_cfg) {
  84                         if (priv->scan_request) {
  85                                 dev_dbg(priv->adapter->dev,
  86                                         "info: aborting scan\n");
  87                                 cfg80211_scan_done(priv->scan_request, 1);
  88                                 priv->scan_request = NULL;
  89                         } else {
  90                                 dev_dbg(priv->adapter->dev,
  91                                         "info: scan already aborted\n");
  92                         }
  93
  94                         kfree(priv->user_scan_cfg);
  95                         priv->user_scan_cfg = NULL;
  96                 }
  97                 goto done;
  98         }
  99
 100         if (!atomic_read(&priv->adapter->is_tx_received)) {
 101                 adapter->empty_tx_q_cnt++;
 102                 if (adapter->empty_tx_q_cnt == MWIFIEX_MAX_EMPTY_TX_Q_CNT) {
 103                         /*
 104                          * No Tx traffic for 200msec. Get scan command from
 105                          * scan pending queue and put to cmd pending queue to
 106                          * resume scan operation
 107                          */
 108                         adapter->scan_delay_cnt = 0;
 109                         adapter->empty_tx_q_cnt = 0;
 110                         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
 111                         cmd_node = list_first_entry(&adapter->scan_pending_q,
 112                                                     struct cmd_ctrl_node, list);
 113                         list_del(&cmd_node->list);
 114                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
 115                                                flags);
 116
 117                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
 118                                                         true);
 119                         queue_work(adapter->workqueue, &adapter->main_work);
 120                         goto done;
 121                 }
 122         } else {
 123                 adapter->empty_tx_q_cnt = 0;
 124         }
 125
 126         /* Delay scan operation further by 20msec */
 127         mod_timer(&priv->scan_delay_timer, jiffies +
 128                   msecs_to_jiffies(MWIFIEX_SCAN_DELAY_MSEC));
 129         adapter->scan_delay_cnt++;
 130
 131 done:
 132         if (atomic_read(&priv->adapter->is_tx_received))
 133                 atomic_set(&priv->adapter->is_tx_received, false);
 134
 135         return;
 136 }
 137
 138 /*
 139  * This function initializes the private structure and sets default
 140  * values to the members.
 141  *
 142  * Additionally, it also initializes all the locks and sets up all the
 143  * lists.
 144  */
 145 int mwifiex_init_priv(struct mwifiex_private *priv)
 146 {
 147         u32 i;
 148
 149         priv->media_connected = false;
 150         memset(priv->curr_addr, 0xff, ETH_ALEN);
 151
 152         priv->pkt_tx_ctrl = 0;
 153         priv->bss_mode = NL80211_IFTYPE_UNSPECIFIED;
 154         priv->data_rate = 0;    /* Initially indicate the rate as auto */
 155         priv->is_data_rate_auto = true;
 156         priv->bcn_avg_factor = DEFAULT_BCN_AVG_FACTOR;
 157         priv->data_avg_factor = DEFAULT_DATA_AVG_FACTOR;
 158
 159         priv->sec_info.wep_enabled = 0;
 160         priv->sec_info.authentication_mode = NL80211_AUTHTYPE_OPEN_SYSTEM;
 161         priv->sec_info.encryption_mode = 0;
 162         for (i = 0; i < ARRAY_SIZE(priv->wep_key); i++)
 163                 memset(&priv->wep_key[i], 0, sizeof(struct mwifiex_wep_key));
 164         priv->wep_key_curr_index = 0;
 165         priv->curr_pkt_filter = HostCmd_ACT_MAC_RX_ON | HostCmd_ACT_MAC_TX_ON |
 166                                 HostCmd_ACT_MAC_ETHERNETII_ENABLE;
 167
 168         priv->beacon_period = 100; /* beacon interval */ ;
 169         priv->attempted_bss_desc = NULL;
 170         memset(&priv->curr_bss_params, 0, sizeof(priv->curr_bss_params));
 171         priv->listen_interval = MWIFIEX_DEFAULT_LISTEN_INTERVAL;
 172
 173         memset(&priv->prev_ssid, 0, sizeof(priv->prev_ssid));
 174         memset(&priv->prev_bssid, 0, sizeof(priv->prev_bssid));
 175         memset(&priv->assoc_rsp_buf, 0, sizeof(priv->assoc_rsp_buf));
 176         priv->assoc_rsp_size = 0;
 177         priv->adhoc_channel = DEFAULT_AD_HOC_CHANNEL;
 178         priv->atim_window = 0;
 179         priv->adhoc_state = ADHOC_IDLE;
 180         priv->tx_power_level = 0;
 181         priv->max_tx_power_level = 0;
 182         priv->min_tx_power_level = 0;
 183         priv->tx_rate = 0;
 184         priv->rxpd_htinfo = 0;
 185         priv->rxpd_rate = 0;
 186         priv->rate_bitmap = 0;
 187         priv->data_rssi_last = 0;
 188         priv->data_rssi_avg = 0;
 189         priv->data_nf_avg = 0;
 190         priv->data_nf_last = 0;
 191         priv->bcn_rssi_last = 0;
 192         priv->bcn_rssi_avg = 0;
 193         priv->bcn_nf_avg = 0;
 194         priv->bcn_nf_last = 0;
 195         memset(&priv->wpa_ie, 0, sizeof(priv->wpa_ie));
 196         memset(&priv->aes_key, 0, sizeof(priv->aes_key));
 197         priv->wpa_ie_len = 0;
 198         priv->wpa_is_gtk_set = false;
 199
 200         memset(&priv->assoc_tlv_buf, 0, sizeof(priv->assoc_tlv_buf));
 201         priv->assoc_tlv_buf_len = 0;
 202         memset(&priv->wps, 0, sizeof(priv->wps));
 203         memset(&priv->gen_ie_buf, 0, sizeof(priv->gen_ie_buf));
 204         priv->gen_ie_buf_len = 0;
 205         memset(priv->vs_ie, 0, sizeof(priv->vs_ie));
 206
 207         priv->wmm_required = true;
 208         priv->wmm_enabled = false;
 209         priv->wmm_qosinfo = 0;
 210         priv->curr_bcn_buf = NULL;
 211         priv->curr_bcn_size = 0;
 212         priv->wps_ie = NULL;
 213         priv->wps_ie_len = 0;
 214         priv->ap_11n_enabled = 0;
 215         memset(&priv->roc_cfg, 0, sizeof(priv->roc_cfg));
 216
 217         priv->scan_block = false;
 218
 219         setup_timer(&priv->scan_delay_timer, scan_delay_timer_fn,
 220                     (unsigned long)priv);
 221
 222         return mwifiex_add_bss_prio_tbl(priv);
 223 }
 224
 225 /*
 226  * This function allocates buffers for members of the adapter
 227  * structure.
 228  *
 229  * The memory allocated includes scan table, command buffers, and
 230  * sleep confirm command buffer. In addition, the queues are
 231  * also initialized.
 232  */
 233 static int mwifiex_allocate_adapter(struct mwifiex_adapter *adapter)
 234 {
 235         int ret;
 236
 237         /* Allocate command buffer */
 238         ret = mwifiex_alloc_cmd_buffer(adapter);
 239         if (ret) {
 240                 dev_err(adapter->dev, "%s: failed to alloc cmd buffer\n",
 241                         __func__);
 242                 return -1;
 243         }
 244
 245         adapter->sleep_cfm =
 246                 dev_alloc_skb(sizeof(struct mwifiex_opt_sleep_confirm)
 247                               + INTF_HEADER_LEN);
 248
 249         if (!adapter->sleep_cfm) {
 250                 dev_err(adapter->dev, "%s: failed to alloc sleep cfm"
 251                         " cmd buffer\n", __func__);
 252                 return -1;
 253         }
 254         skb_reserve(adapter->sleep_cfm, INTF_HEADER_LEN);
 255
 256         return 0;
 257 }
 258
 259 /*
 260  * This function initializes the adapter structure and sets default
 261  * values to the members of adapter.
 262  *
 263  * This also initializes the WMM related parameters in the driver private
 264  * structures.
 265  */
 266 static void mwifiex_init_adapter(struct mwifiex_adapter *adapter)
 267 {
 268         struct mwifiex_opt_sleep_confirm *sleep_cfm_buf = NULL;
 269
 270         skb_put(adapter->sleep_cfm, sizeof(struct mwifiex_opt_sleep_confirm));
 271
 272         adapter->cmd_sent = false;
 273
 274         if (adapter->iface_type == MWIFIEX_SDIO)
 275                 adapter->data_sent = true;
 276         else
 277                 adapter->data_sent = false;
 278
 279         adapter->cmd_resp_received = false;
 280         adapter->event_received = false;
 281         adapter->data_received = false;
 282
 283         adapter->surprise_removed = false;
 284
 285         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 286
 287         adapter->ps_mode = MWIFIEX_802_11_POWER_MODE_CAM;
 288         adapter->ps_state = PS_STATE_AWAKE;
 289         adapter->need_to_wakeup = false;
 290
 291         adapter->scan_mode = HostCmd_BSS_MODE_ANY;
 292         adapter->specific_scan_time = MWIFIEX_SPECIFIC_SCAN_CHAN_TIME;
 293         adapter->active_scan_time = MWIFIEX_ACTIVE_SCAN_CHAN_TIME;
 294         adapter->passive_scan_time = MWIFIEX_PASSIVE_SCAN_CHAN_TIME;
 295
 296         adapter->scan_probes = 1;
 297
 298         adapter->multiple_dtim = 1;
 299
 300         adapter->local_listen_interval = 0;     /* default value in firmware
 301                                                    will be used */
 302
 303         adapter->is_deep_sleep = false;
 304
 305         adapter->delay_null_pkt = false;
 306         adapter->delay_to_ps = 1000;
 307         adapter->enhanced_ps_mode = PS_MODE_AUTO;
 308
 309         adapter->gen_null_pkt = false;  /* Disable NULL Pkg generation by
 310                                            default */
 311         adapter->pps_uapsd_mode = false; /* Disable pps/uapsd mode by
 312                                            default */
 313         adapter->pm_wakeup_card_req = false;
 314
 315         adapter->pm_wakeup_fw_try = false;
 316
 317         adapter->tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 318         adapter->curr_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 319
 320         adapter->is_hs_configured = false;
 321         adapter->hs_cfg.conditions = cpu_to_le32(HS_CFG_COND_DEF);
 322         adapter->hs_cfg.gpio = HS_CFG_GPIO_DEF;
 323         adapter->hs_cfg.gap = HS_CFG_GAP_DEF;
 324         adapter->hs_activated = false;
 325
 326         memset(adapter->event_body, 0, sizeof(adapter->event_body));
 327         adapter->hw_dot_11n_dev_cap = 0;
 328         adapter->hw_dev_mcs_support = 0;
 329         adapter->sec_chan_offset = 0;
 330         adapter->adhoc_11n_enabled = false;
 331
 332         mwifiex_wmm_init(adapter);
 333
 334         if (adapter->sleep_cfm) {
 335                 sleep_cfm_buf = (struct mwifiex_opt_sleep_confirm *)
 336                                                 adapter->sleep_cfm->data;
 337                 memset(sleep_cfm_buf, 0, adapter->sleep_cfm->len);
 338                 sleep_cfm_buf->command =
 339                                 cpu_to_le16(HostCmd_CMD_802_11_PS_MODE_ENH);
 340                 sleep_cfm_buf->size =
 341                                 cpu_to_le16(adapter->sleep_cfm->len);
 342                 sleep_cfm_buf->result = 0;
 343                 sleep_cfm_buf->action = cpu_to_le16(SLEEP_CONFIRM);
 344                 sleep_cfm_buf->resp_ctrl = cpu_to_le16(RESP_NEEDED);
 345         }
 346         memset(&adapter->sleep_params, 0, sizeof(adapter->sleep_params));
 347         memset(&adapter->sleep_period, 0, sizeof(adapter->sleep_period));
 348         adapter->tx_lock_flag = false;
 349         adapter->null_pkt_interval = 0;
 350         adapter->fw_bands = 0;
 351         adapter->config_bands = 0;
 352         adapter->adhoc_start_band = 0;
 353         adapter->scan_channels = NULL;
 354         adapter->fw_release_number = 0;
 355         adapter->fw_cap_info = 0;
 356         memset(&adapter->upld_buf, 0, sizeof(adapter->upld_buf));
 357         adapter->event_cause = 0;
 358         adapter->region_code = 0;
 359         adapter->bcn_miss_time_out = DEFAULT_BCN_MISS_TIMEOUT;
 360         adapter->adhoc_awake_period = 0;
 361         memset(&adapter->arp_filter, 0, sizeof(adapter->arp_filter));
 362         adapter->arp_filter_size = 0;
 363         adapter->max_mgmt_ie_index = MAX_MGMT_IE_INDEX;
 364         adapter->empty_tx_q_cnt = 0;
 365 }
 366
 367 /*
 368  * This function sets trans_start per tx_queue
 369  */
 370 void mwifiex_set_trans_start(struct net_device *dev)
 371 {
 372         int i;
 373
 374         for (i = 0; i < dev->num_tx_queues; i++)
 375                 netdev_get_tx_queue(dev, i)->trans_start = jiffies;
 376
 377         dev->trans_start = jiffies;
 378 }
 379
 380 /*
 381  * This function wakes up all queues in net_device
 382  */
 383 void mwifiex_wake_up_net_dev_queue(struct net_device *netdev,
 384                                         struct mwifiex_adapter *adapter)
 385 {
 386         unsigned long dev_queue_flags;
 387         unsigned int i;
 388
 389         spin_lock_irqsave(&adapter->queue_lock, dev_queue_flags);
 390
 391         for (i = 0; i < netdev->num_tx_queues; i++) {
 392                 struct netdev_queue *txq = netdev_get_tx_queue(netdev, i);
 393
 394                 if (netif_tx_queue_stopped(txq))
 395                         netif_tx_wake_queue(txq);
 396         }
 397
 398         spin_unlock_irqrestore(&adapter->queue_lock, dev_queue_flags);
 399 }
 400
 401 /*
 402  * This function stops all queues in net_device
 403  */
 404 void mwifiex_stop_net_dev_queue(struct net_device *netdev,
 405                                         struct mwifiex_adapter *adapter)
 406 {
 407         unsigned long dev_queue_flags;
 408         unsigned int i;
 409
 410         spin_lock_irqsave(&adapter->queue_lock, dev_queue_flags);
 411
 412         for (i = 0; i < netdev->num_tx_queues; i++) {
 413                 struct netdev_queue *txq = netdev_get_tx_queue(netdev, i);
 414
 415                 if (!netif_tx_queue_stopped(txq))
 416                         netif_tx_stop_queue(txq);
 417         }
 418
 419         spin_unlock_irqrestore(&adapter->queue_lock, dev_queue_flags);
 420 }
 421
 422 /*
 423  *  This function releases the lock variables and frees the locks and
 424  *  associated locks.
 425  */
 426 static void mwifiex_free_lock_list(struct mwifiex_adapter *adapter)
 427 {
 428         struct mwifiex_private *priv;
 429         s32 i, j;
 430
 431         /* Free lists */
 432         list_del(&adapter->cmd_free_q);
 433         list_del(&adapter->cmd_pending_q);
 434         list_del(&adapter->scan_pending_q);
 435
 436         for (i = 0; i < adapter->priv_num; i++)
 437                 list_del(&adapter->bss_prio_tbl[i].bss_prio_head);
 438
 439         for (i = 0; i < adapter->priv_num; i++) {
 440                 if (adapter->priv[i]) {
 441                         priv = adapter->priv[i];
 442                         for (j = 0; j < MAX_NUM_TID; ++j)
 443                                 list_del(&priv->wmm.tid_tbl_ptr[j].ra_list);
 444                         list_del(&priv->tx_ba_stream_tbl_ptr);
 445                         list_del(&priv->rx_reorder_tbl_ptr);
 446                         list_del(&priv->sta_list);
 447                 }
 448         }
 449 }
 450
 451 /*
 452  * This function frees the adapter structure.
 453  *
 454  * The freeing operation is done recursively, by canceling all
 455  * pending commands, freeing the member buffers previously
 456  * allocated (command buffers, scan table buffer, sleep confirm
 457  * command buffer), stopping the timers and calling the cleanup
 458  * routines for every interface, before the actual adapter
 459  * structure is freed.
 460  */
 461 static void
 462 mwifiex_free_adapter(struct mwifiex_adapter *adapter)
 463 {
 464         if (!adapter) {
 465                 pr_err("%s: adapter is NULL\n", __func__);
 466                 return;
 467         }
 468
 469         mwifiex_cancel_all_pending_cmd(adapter);
 470
 471         /* Free lock variables */
 472         mwifiex_free_lock_list(adapter);
 473
 474         /* Free command buffer */
 475         dev_dbg(adapter->dev, "info: free cmd buffer\n");
 476         mwifiex_free_cmd_buffer(adapter);
 477
 478         del_timer(&adapter->cmd_timer);
 479
 480         dev_dbg(adapter->dev, "info: free scan table\n");
 481
 482         if (adapter->if_ops.cleanup_if)
 483                 adapter->if_ops.cleanup_if(adapter);
 484
 485         if (adapter->sleep_cfm)
 486                 dev_kfree_skb_any(adapter->sleep_cfm);
 487 }
 488
 489 /*
 490  *  This function intializes the lock variables and
 491  *  the list heads.
 492  */
 493 int mwifiex_init_lock_list(struct mwifiex_adapter *adapter)
 494 {
 495         struct mwifiex_private *priv;
 496         s32 i, j;
 497
 498         spin_lock_init(&adapter->mwifiex_lock);
 499         spin_lock_init(&adapter->int_lock);
 500         spin_lock_init(&adapter->main_proc_lock);
 501         spin_lock_init(&adapter->mwifiex_cmd_lock);
 502         spin_lock_init(&adapter->queue_lock);
 503         for (i = 0; i < adapter->priv_num; i++) {
 504                 if (adapter->priv[i]) {
 505                         priv = adapter->priv[i];
 506                         spin_lock_init(&priv->rx_pkt_lock);
 507                         spin_lock_init(&priv->wmm.ra_list_spinlock);
 508                         spin_lock_init(&priv->curr_bcn_buf_lock);
 509                         spin_lock_init(&priv->sta_list_spinlock);
 510                 }
 511         }
 512
 513         /* Initialize cmd_free_q */
 514         INIT_LIST_HEAD(&adapter->cmd_free_q);
 515         /* Initialize cmd_pending_q */
 516         INIT_LIST_HEAD(&adapter->cmd_pending_q);
 517         /* Initialize scan_pending_q */
 518         INIT_LIST_HEAD(&adapter->scan_pending_q);
 519
 520         spin_lock_init(&adapter->cmd_free_q_lock);
 521         spin_lock_init(&adapter->cmd_pending_q_lock);
 522         spin_lock_init(&adapter->scan_pending_q_lock);
 523
 524         skb_queue_head_init(&adapter->usb_rx_data_q);
 525
 526         for (i = 0; i < adapter->priv_num; ++i) {
 527                 INIT_LIST_HEAD(&adapter->bss_prio_tbl[i].bss_prio_head);
 528                 adapter->bss_prio_tbl[i].bss_prio_cur = NULL;
 529                 spin_lock_init(&adapter->bss_prio_tbl[i].bss_prio_lock);
 530         }
 531
 532         for (i = 0; i < adapter->priv_num; i++) {
 533                 if (!adapter->priv[i])
 534                         continue;
 535                 priv = adapter->priv[i];
 536                 for (j = 0; j < MAX_NUM_TID; ++j)
 537                         INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[j].ra_list);
 538                 INIT_LIST_HEAD(&priv->tx_ba_stream_tbl_ptr);
 539                 INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
 540                 INIT_LIST_HEAD(&priv->sta_list);
 541
 542                 spin_lock_init(&priv->tx_ba_stream_tbl_lock);
 543                 spin_lock_init(&priv->rx_reorder_tbl_lock);
 544         }
 545
 546         return 0;
 547 }
 548
 549 /*
 550  * This function initializes the firmware.
 551  *
 552  * The following operations are performed sequentially -
 553  *      - Allocate adapter structure
 554  *      - Initialize the adapter structure
 555  *      - Initialize the private structure
 556  *      - Add BSS priority tables to the adapter structure
 557  *      - For each interface, send the init commands to firmware
 558  *      - Send the first command in command pending queue, if available
 559  */
 560 int mwifiex_init_fw(struct mwifiex_adapter *adapter)
 561 {
 562         int ret;
 563         struct mwifiex_private *priv;
 564         u8 i, first_sta = true;
 565         int is_cmd_pend_q_empty;
 566         unsigned long flags;
 567
 568         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 569
 570         /* Allocate memory for member of adapter structure */
 571         ret = mwifiex_allocate_adapter(adapter);
 572         if (ret)
 573                 return -1;
 574
 575         /* Initialize adapter structure */
 576         mwifiex_init_adapter(adapter);
 577
 578         for (i = 0; i < adapter->priv_num; i++) {
 579                 if (adapter->priv[i]) {
 580                         priv = adapter->priv[i];
 581
 582                         /* Initialize private structure */
 583                         ret = mwifiex_init_priv(priv);
 584                         if (ret)
 585                                 return -1;
 586                 }
 587         }
 588
 589         if (adapter->if_ops.init_fw_port) {
 590                 if (adapter->if_ops.init_fw_port(adapter))
 591                         return -1;
 592         }
 593
 594         for (i = 0; i < adapter->priv_num; i++) {
 595                 if (adapter->priv[i]) {
 596                         ret = mwifiex_sta_init_cmd(adapter->priv[i], first_sta);
 597                         if (ret == -1)
 598                                 return -1;
 599
 600                         first_sta = false;
 601                 }
 602         }
 603
 604         spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
 605         is_cmd_pend_q_empty = list_empty(&adapter->cmd_pending_q);
 606         spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);
 607         if (!is_cmd_pend_q_empty) {
 608                 /* Send the first command in queue and return */
 609                 if (mwifiex_main_process(adapter) != -1)
 610                         ret = -EINPROGRESS;
 611         } else {
 612                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 613         }
 614
 615         return ret;
 616 }
 617
 618 /*
 619  * This function deletes the BSS priority tables.
 620  *
 621  * The function traverses through all the allocated BSS priority nodes
 622  * in every BSS priority table and frees them.
 623  */
 624 static void mwifiex_delete_bss_prio_tbl(struct mwifiex_private *priv)
 625 {
 626         int i;
 627         struct mwifiex_adapter *adapter = priv->adapter;
 628         struct mwifiex_bss_prio_node *bssprio_node, *tmp_node, **cur;
 629         struct list_head *head;
 630         spinlock_t *lock; /* bss priority lock */
 631         unsigned long flags;
 632
 633         for (i = 0; i < adapter->priv_num; ++i) {
 634                 head = &adapter->bss_prio_tbl[i].bss_prio_head;
 635                 cur = &adapter->bss_prio_tbl[i].bss_prio_cur;
 636                 lock = &adapter->bss_prio_tbl[i].bss_prio_lock;
 637                 dev_dbg(adapter->dev, "info: delete BSS priority table,"
 638                                 " bss_type = %d, bss_num = %d, i = %d,"
 639                                 " head = %p, cur = %p\n",
 640                               priv->bss_type, priv->bss_num, i, head, *cur);
 641                 if (*cur) {
 642                         spin_lock_irqsave(lock, flags);
 643                         if (list_empty(head)) {
 644                                 spin_unlock_irqrestore(lock, flags);
 645                                 continue;
 646                         }
 647                         bssprio_node = list_first_entry(head,
 648                                         struct mwifiex_bss_prio_node, list);
 649                         spin_unlock_irqrestore(lock, flags);
 650
 651                         list_for_each_entry_safe(bssprio_node, tmp_node, head,
 652                                                  list) {
 653                                 if (bssprio_node->priv == priv) {
 654                                         dev_dbg(adapter->dev, "info: Delete "
 655                                                 "node %p, next = %p\n",
 656                                                 bssprio_node, tmp_node);
 657                                         spin_lock_irqsave(lock, flags);
 658                                         list_del(&bssprio_node->list);
 659                                         spin_unlock_irqrestore(lock, flags);
 660                                         kfree(bssprio_node);
 661                                 }
 662                         }
 663                         *cur = (struct mwifiex_bss_prio_node *)head;
 664                 }
 665         }
 666 }
 667
 668 /*
 669  * This function frees the private structure, including cleans
 670  * up the TX and RX queues and frees the BSS priority tables.
 671  */
 672 void mwifiex_free_priv(struct mwifiex_private *priv)
 673 {
 674         mwifiex_clean_txrx(priv);
 675         mwifiex_delete_bss_prio_tbl(priv);
 676         mwifiex_free_curr_bcn(priv);
 677 }
 678
 679 /*
 680  * This function is used to shutdown the driver.
 681  *
 682  * The following operations are performed sequentially -
 683  *      - Check if already shut down
 684  *      - Make sure the main process has stopped
 685  *      - Clean up the Tx and Rx queues
 686  *      - Delete BSS priority tables
 687  *      - Free the adapter
 688  *      - Notify completion
 689  */
 690 int
 691 mwifiex_shutdown_drv(struct mwifiex_adapter *adapter)
 692 {
 693         int ret = -EINPROGRESS;
 694         struct mwifiex_private *priv;
 695         s32 i;
 696         unsigned long flags;
 697         struct sk_buff *skb;
 698
 699         /* mwifiex already shutdown */
 700         if (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY)
 701                 return 0;
 702
 703         adapter->hw_status = MWIFIEX_HW_STATUS_CLOSING;
 704         /* wait for mwifiex_process to complete */
 705         if (adapter->mwifiex_processing) {
 706                 dev_warn(adapter->dev, "main process is still running\n");
 707                 return ret;
 708         }
 709
 710         /* cancel current command */
 711         if (adapter->curr_cmd) {
 712                 dev_warn(adapter->dev, "curr_cmd is still in processing\n");
 713                 del_timer(&adapter->cmd_timer);
 714                 mwifiex_recycle_cmd_node(adapter, adapter->curr_cmd);
 715                 adapter->curr_cmd = NULL;
 716         }
 717
 718         /* shut down mwifiex */
 719         dev_dbg(adapter->dev, "info: shutdown mwifiex...\n");
 720
 721         /* Clean up Tx/Rx queues and delete BSS priority table */
 722         for (i = 0; i < adapter->priv_num; i++) {
 723                 if (adapter->priv[i]) {
 724                         priv = adapter->priv[i];
 725
 726                         mwifiex_clean_txrx(priv);
 727                         mwifiex_delete_bss_prio_tbl(priv);
 728                 }
 729         }
 730
 731         spin_lock_irqsave(&adapter->mwifiex_lock, flags);
 732
 733         if (adapter->if_ops.data_complete) {
 734                 while ((skb = skb_dequeue(&adapter->usb_rx_data_q))) {
 735                         struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
 736
 737                         priv = adapter->priv[rx_info->bss_num];
 738                         if (priv)
 739                                 priv->stats.rx_dropped++;
 740
 741                         adapter->if_ops.data_complete(adapter, skb);
 742                 }
 743         }
 744
 745         /* Free adapter structure */
 746         mwifiex_free_adapter(adapter);
 747
 748         spin_unlock_irqrestore(&adapter->mwifiex_lock, flags);
 749
 750         /* Notify completion */
 751         ret = mwifiex_shutdown_fw_complete(adapter);
 752
 753         return ret;
 754 }
 755
 756 /*
 757  * This function downloads the firmware to the card.
 758  *
 759  * The actual download is preceded by two sanity checks -
 760  *      - Check if firmware is already running
 761  *      - Check if the interface is the winner to download the firmware
 762  *
 763  * ...and followed by another -
 764  *      - Check if the firmware is downloaded successfully
 765  *
 766  * After download is successfully completed, the host interrupts are enabled.
 767  */
 768 int mwifiex_dnld_fw(struct mwifiex_adapter *adapter,
 769                     struct mwifiex_fw_image *pmfw)
 770 {
 771         int ret;
 772         u32 poll_num = 1;
 773
 774         if (adapter->if_ops.check_fw_status) {
 775                 adapter->winner = 0;
 776
 777                 /* check if firmware is already running */
 778                 ret = adapter->if_ops.check_fw_status(adapter, poll_num);
 779                 if (!ret) {
 780                         dev_notice(adapter->dev,
 781                                    "WLAN FW already running! Skip FW dnld\n");
 782                         goto done;
 783                 }
 784
 785                 poll_num = MAX_FIRMWARE_POLL_TRIES;
 786
 787                 /* check if we are the winner for downloading FW */
 788                 if (!adapter->winner) {
 789                         dev_notice(adapter->dev,
 790                                    "FW already running! Skip FW dnld\n");
 791                         poll_num = MAX_MULTI_INTERFACE_POLL_TRIES;
 792                         goto poll_fw;
 793                 }
 794         }
 795
 796         if (pmfw) {
 797                 /* Download firmware with helper */
 798                 ret = adapter->if_ops.prog_fw(adapter, pmfw);
 799                 if (ret) {
 800                         dev_err(adapter->dev, "prog_fw failed ret=%#x\n", ret);
 801                         return ret;
 802                 }
 803         }
 804
 805 poll_fw:
 806         /* Check if the firmware is downloaded successfully or not */
 807         ret = adapter->if_ops.check_fw_status(adapter, poll_num);
 808         if (ret) {
 809                 dev_err(adapter->dev, "FW failed to be active in time\n");
 810                 return -1;
 811         }
 812 done:
 813         /* re-enable host interrupt for mwifiex after fw dnld is successful */
 814         if (adapter->if_ops.enable_int)
 815                 adapter->if_ops.enable_int(adapter);
 816
 817         return ret;
 818 }