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                 dev_err(adapter->dev, "%s: failed to alloc bss_prio\n",
  44                         __func__);
  45                 return -ENOMEM;
  46         }
  47
  48         bss_prio->priv = priv;
  49         INIT_LIST_HEAD(&bss_prio->list);
  50         if (!tbl[priv->bss_priority].bss_prio_cur)
  51                 tbl[priv->bss_priority].bss_prio_cur = bss_prio;
  52
  53         spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
  54         list_add_tail(&bss_prio->list, &tbl[priv->bss_priority].bss_prio_head);
  55         spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);
  56
  57         return 0;
  58 }
  59
  60 static void scan_delay_timer_fn(unsigned long data)
  61 {
  62         struct mwifiex_private *priv = (struct mwifiex_private *)data;
  63         struct mwifiex_adapter *adapter = priv->adapter;
  64         struct cmd_ctrl_node *cmd_node, *tmp_node;
  65         unsigned long flags;
  66
  67         if (adapter->scan_delay_cnt == MWIFIEX_MAX_SCAN_DELAY_CNT) {
  68                 /*
  69                  * Abort scan operation by cancelling all pending scan
  70                  * commands
  71                  */
  72                 spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
  73                 list_for_each_entry_safe(cmd_node, tmp_node,
  74                                          &adapter->scan_pending_q, list) {
  75                         list_del(&cmd_node->list);
  76                         mwifiex_insert_cmd_to_free_q(adapter, cmd_node);
  77                 }
  78                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
  79
  80                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
  81                 adapter->scan_processing = false;
  82                 adapter->scan_delay_cnt = 0;
  83                 adapter->empty_tx_q_cnt = 0;
  84                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
  85
  86                 if (priv->user_scan_cfg) {
  87                         if (priv->scan_request) {
  88                                 dev_dbg(priv->adapter->dev,
  89                                         "info: aborting scan\n");
  90                                 cfg80211_scan_done(priv->scan_request, 1);
  91                                 priv->scan_request = NULL;
  92                         } else {
  93                                 dev_dbg(priv->adapter->dev,
  94                                         "info: scan already aborted\n");
  95                         }
  96
  97                         kfree(priv->user_scan_cfg);
  98                         priv->user_scan_cfg = NULL;
  99                 }
 100
 101                 if (priv->scan_pending_on_block) {
 102                         priv->scan_pending_on_block = false;
 103                         up(&priv->async_sem);
 104                 }
 105                 goto done;
 106         }
 107
 108         if (!atomic_read(&priv->adapter->is_tx_received)) {
 109                 adapter->empty_tx_q_cnt++;
 110                 if (adapter->empty_tx_q_cnt == MWIFIEX_MAX_EMPTY_TX_Q_CNT) {
 111                         /*
 112                          * No Tx traffic for 200msec. Get scan command from
 113                          * scan pending queue and put to cmd pending queue to
 114                          * resume scan operation
 115                          */
 116                         adapter->scan_delay_cnt = 0;
 117                         adapter->empty_tx_q_cnt = 0;
 118                         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
 119                         cmd_node = list_first_entry(&adapter->scan_pending_q,
 120                                                     struct cmd_ctrl_node, list);
 121                         list_del(&cmd_node->list);
 122                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
 123                                                flags);
 124
 125                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
 126                                                         true);
 127                         queue_work(adapter->workqueue, &adapter->main_work);
 128                         goto done;
 129                 }
 130         } else {
 131                 adapter->empty_tx_q_cnt = 0;
 132         }
 133
 134         /* Delay scan operation further by 20msec */
 135         mod_timer(&priv->scan_delay_timer, jiffies +
 136                   msecs_to_jiffies(MWIFIEX_SCAN_DELAY_MSEC));
 137         adapter->scan_delay_cnt++;
 138
 139 done:
 140         if (atomic_read(&priv->adapter->is_tx_received))
 141                 atomic_set(&priv->adapter->is_tx_received, false);
 142
 143         return;
 144 }
 145
 146 /*
 147  * This function initializes the private structure and sets default
 148  * values to the members.
 149  *
 150  * Additionally, it also initializes all the locks and sets up all the
 151  * lists.
 152  */
 153 int mwifiex_init_priv(struct mwifiex_private *priv)
 154 {
 155         u32 i;
 156
 157         priv->media_connected = false;
 158         memset(priv->curr_addr, 0xff, ETH_ALEN);
 159
 160         priv->pkt_tx_ctrl = 0;
 161         priv->bss_mode = NL80211_IFTYPE_UNSPECIFIED;
 162         priv->data_rate = 0;    /* Initially indicate the rate as auto */
 163         priv->is_data_rate_auto = true;
 164         priv->bcn_avg_factor = DEFAULT_BCN_AVG_FACTOR;
 165         priv->data_avg_factor = DEFAULT_DATA_AVG_FACTOR;
 166
 167         priv->sec_info.wep_enabled = 0;
 168         priv->sec_info.authentication_mode = NL80211_AUTHTYPE_OPEN_SYSTEM;
 169         priv->sec_info.encryption_mode = 0;
 170         for (i = 0; i < ARRAY_SIZE(priv->wep_key); i++)
 171                 memset(&priv->wep_key[i], 0, sizeof(struct mwifiex_wep_key));
 172         priv->wep_key_curr_index = 0;
 173         priv->curr_pkt_filter = HostCmd_ACT_MAC_RX_ON | HostCmd_ACT_MAC_TX_ON |
 174                                 HostCmd_ACT_MAC_ETHERNETII_ENABLE;
 175
 176         priv->beacon_period = 100; /* beacon interval */ ;
 177         priv->attempted_bss_desc = NULL;
 178         memset(&priv->curr_bss_params, 0, sizeof(priv->curr_bss_params));
 179         priv->listen_interval = MWIFIEX_DEFAULT_LISTEN_INTERVAL;
 180
 181         memset(&priv->prev_ssid, 0, sizeof(priv->prev_ssid));
 182         memset(&priv->prev_bssid, 0, sizeof(priv->prev_bssid));
 183         memset(&priv->assoc_rsp_buf, 0, sizeof(priv->assoc_rsp_buf));
 184         priv->assoc_rsp_size = 0;
 185         priv->adhoc_channel = DEFAULT_AD_HOC_CHANNEL;
 186         priv->atim_window = 0;
 187         priv->adhoc_state = ADHOC_IDLE;
 188         priv->tx_power_level = 0;
 189         priv->max_tx_power_level = 0;
 190         priv->min_tx_power_level = 0;
 191         priv->tx_rate = 0;
 192         priv->rxpd_htinfo = 0;
 193         priv->rxpd_rate = 0;
 194         priv->rate_bitmap = 0;
 195         priv->data_rssi_last = 0;
 196         priv->data_rssi_avg = 0;
 197         priv->data_nf_avg = 0;
 198         priv->data_nf_last = 0;
 199         priv->bcn_rssi_last = 0;
 200         priv->bcn_rssi_avg = 0;
 201         priv->bcn_nf_avg = 0;
 202         priv->bcn_nf_last = 0;
 203         memset(&priv->wpa_ie, 0, sizeof(priv->wpa_ie));
 204         memset(&priv->aes_key, 0, sizeof(priv->aes_key));
 205         priv->wpa_ie_len = 0;
 206         priv->wpa_is_gtk_set = false;
 207
 208         memset(&priv->assoc_tlv_buf, 0, sizeof(priv->assoc_tlv_buf));
 209         priv->assoc_tlv_buf_len = 0;
 210         memset(&priv->wps, 0, sizeof(priv->wps));
 211         memset(&priv->gen_ie_buf, 0, sizeof(priv->gen_ie_buf));
 212         priv->gen_ie_buf_len = 0;
 213         memset(priv->vs_ie, 0, sizeof(priv->vs_ie));
 214
 215         priv->wmm_required = true;
 216         priv->wmm_enabled = false;
 217         priv->wmm_qosinfo = 0;
 218         priv->curr_bcn_buf = NULL;
 219         priv->curr_bcn_size = 0;
 220         priv->wps_ie = NULL;
 221         priv->wps_ie_len = 0;
 222         priv->ap_11n_enabled = 0;
 223         memset(&priv->roc_cfg, 0, sizeof(priv->roc_cfg));
 224
 225         priv->scan_block = false;
 226
 227         setup_timer(&priv->scan_delay_timer, scan_delay_timer_fn,
 228                     (unsigned long)priv);
 229
 230         return mwifiex_add_bss_prio_tbl(priv);
 231 }
 232
 233 /*
 234  * This function allocates buffers for members of the adapter
 235  * structure.
 236  *
 237  * The memory allocated includes scan table, command buffers, and
 238  * sleep confirm command buffer. In addition, the queues are
 239  * also initialized.
 240  */
 241 static int mwifiex_allocate_adapter(struct mwifiex_adapter *adapter)
 242 {
 243         int ret;
 244
 245         /* Allocate command buffer */
 246         ret = mwifiex_alloc_cmd_buffer(adapter);
 247         if (ret) {
 248                 dev_err(adapter->dev, "%s: failed to alloc cmd buffer\n",
 249                         __func__);
 250                 return -1;
 251         }
 252
 253         adapter->sleep_cfm =
 254                 dev_alloc_skb(sizeof(struct mwifiex_opt_sleep_confirm)
 255                               + INTF_HEADER_LEN);
 256
 257         if (!adapter->sleep_cfm) {
 258                 dev_err(adapter->dev, "%s: failed to alloc sleep cfm"
 259                         " cmd buffer\n", __func__);
 260                 return -1;
 261         }
 262         skb_reserve(adapter->sleep_cfm, INTF_HEADER_LEN);
 263
 264         return 0;
 265 }
 266
 267 /*
 268  * This function initializes the adapter structure and sets default
 269  * values to the members of adapter.
 270  *
 271  * This also initializes the WMM related parameters in the driver private
 272  * structures.
 273  */
 274 static void mwifiex_init_adapter(struct mwifiex_adapter *adapter)
 275 {
 276         struct mwifiex_opt_sleep_confirm *sleep_cfm_buf = NULL;
 277
 278         skb_put(adapter->sleep_cfm, sizeof(struct mwifiex_opt_sleep_confirm));
 279
 280         adapter->cmd_sent = false;
 281
 282         if (adapter->iface_type == MWIFIEX_SDIO)
 283                 adapter->data_sent = true;
 284         else
 285                 adapter->data_sent = false;
 286
 287         adapter->cmd_resp_received = false;
 288         adapter->event_received = false;
 289         adapter->data_received = false;
 290
 291         adapter->surprise_removed = false;
 292
 293         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 294
 295         adapter->ps_mode = MWIFIEX_802_11_POWER_MODE_CAM;
 296         adapter->ps_state = PS_STATE_AWAKE;
 297         adapter->need_to_wakeup = false;
 298
 299         adapter->scan_mode = HostCmd_BSS_MODE_ANY;
 300         adapter->specific_scan_time = MWIFIEX_SPECIFIC_SCAN_CHAN_TIME;
 301         adapter->active_scan_time = MWIFIEX_ACTIVE_SCAN_CHAN_TIME;
 302         adapter->passive_scan_time = MWIFIEX_PASSIVE_SCAN_CHAN_TIME;
 303
 304         adapter->scan_probes = 1;
 305
 306         adapter->multiple_dtim = 1;
 307
 308         adapter->local_listen_interval = 0;     /* default value in firmware
 309                                                    will be used */
 310
 311         adapter->is_deep_sleep = false;
 312
 313         adapter->delay_null_pkt = false;
 314         adapter->delay_to_ps = 1000;
 315         adapter->enhanced_ps_mode = PS_MODE_AUTO;
 316
 317         adapter->gen_null_pkt = false;  /* Disable NULL Pkg generation by
 318                                            default */
 319         adapter->pps_uapsd_mode = false; /* Disable pps/uapsd mode by
 320                                            default */
 321         adapter->pm_wakeup_card_req = false;
 322
 323         adapter->pm_wakeup_fw_try = false;
 324
 325         adapter->max_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 326         adapter->tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 327         adapter->curr_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 328
 329         adapter->is_hs_configured = false;
 330         adapter->hs_cfg.conditions = cpu_to_le32(HOST_SLEEP_CFG_COND_DEF);
 331         adapter->hs_cfg.gpio = HOST_SLEEP_CFG_GPIO_DEF;
 332         adapter->hs_cfg.gap = HOST_SLEEP_CFG_GAP_DEF;
 333         adapter->hs_activated = false;
 334
 335         memset(adapter->event_body, 0, sizeof(adapter->event_body));
 336         adapter->hw_dot_11n_dev_cap = 0;
 337         adapter->hw_dev_mcs_support = 0;
 338         adapter->sec_chan_offset = 0;
 339         adapter->adhoc_11n_enabled = false;
 340
 341         mwifiex_wmm_init(adapter);
 342
 343         if (adapter->sleep_cfm) {
 344                 sleep_cfm_buf = (struct mwifiex_opt_sleep_confirm *)
 345                                                 adapter->sleep_cfm->data;
 346                 memset(sleep_cfm_buf, 0, adapter->sleep_cfm->len);
 347                 sleep_cfm_buf->command =
 348                                 cpu_to_le16(HostCmd_CMD_802_11_PS_MODE_ENH);
 349                 sleep_cfm_buf->size =
 350                                 cpu_to_le16(adapter->sleep_cfm->len);
 351                 sleep_cfm_buf->result = 0;
 352                 sleep_cfm_buf->action = cpu_to_le16(SLEEP_CONFIRM);
 353                 sleep_cfm_buf->resp_ctrl = cpu_to_le16(RESP_NEEDED);
 354         }
 355         memset(&adapter->sleep_params, 0, sizeof(adapter->sleep_params));
 356         memset(&adapter->sleep_period, 0, sizeof(adapter->sleep_period));
 357         adapter->tx_lock_flag = false;
 358         adapter->null_pkt_interval = 0;
 359         adapter->fw_bands = 0;
 360         adapter->config_bands = 0;
 361         adapter->adhoc_start_band = 0;
 362         adapter->scan_channels = NULL;
 363         adapter->fw_release_number = 0;
 364         adapter->fw_cap_info = 0;
 365         memset(&adapter->upld_buf, 0, sizeof(adapter->upld_buf));
 366         adapter->event_cause = 0;
 367         adapter->region_code = 0;
 368         adapter->bcn_miss_time_out = DEFAULT_BCN_MISS_TIMEOUT;
 369         adapter->adhoc_awake_period = 0;
 370         memset(&adapter->arp_filter, 0, sizeof(adapter->arp_filter));
 371         adapter->arp_filter_size = 0;
 372         adapter->max_mgmt_ie_index = MAX_MGMT_IE_INDEX;
 373         adapter->empty_tx_q_cnt = 0;
 374 }
 375
 376 /*
 377  * This function sets trans_start per tx_queue
 378  */
 379 void mwifiex_set_trans_start(struct net_device *dev)
 380 {
 381         int i;
 382
 383         for (i = 0; i < dev->num_tx_queues; i++)
 384                 netdev_get_tx_queue(dev, i)->trans_start = jiffies;
 385
 386         dev->trans_start = jiffies;
 387 }
 388
 389 /*
 390  * This function wakes up all queues in net_device
 391  */
 392 void mwifiex_wake_up_net_dev_queue(struct net_device *netdev,
 393                                         struct mwifiex_adapter *adapter)
 394 {
 395         unsigned long dev_queue_flags;
 396
 397         spin_lock_irqsave(&adapter->queue_lock, dev_queue_flags);
 398         netif_tx_wake_all_queues(netdev);
 399         spin_unlock_irqrestore(&adapter->queue_lock, dev_queue_flags);
 400 }
 401
 402 /*
 403  * This function stops all queues in net_device
 404  */
 405 void mwifiex_stop_net_dev_queue(struct net_device *netdev,
 406                                         struct mwifiex_adapter *adapter)
 407 {
 408         unsigned long dev_queue_flags;
 409
 410         spin_lock_irqsave(&adapter->queue_lock, dev_queue_flags);
 411         netif_tx_stop_all_queues(netdev);
 412         spin_unlock_irqrestore(&adapter->queue_lock, dev_queue_flags);
 413 }
 414
 415 /*
 416  *  This function releases the lock variables and frees the locks and
 417  *  associated locks.
 418  */
 419 static void mwifiex_free_lock_list(struct mwifiex_adapter *adapter)
 420 {
 421         struct mwifiex_private *priv;
 422         s32 i, j;
 423
 424         /* Free lists */
 425         list_del(&adapter->cmd_free_q);
 426         list_del(&adapter->cmd_pending_q);
 427         list_del(&adapter->scan_pending_q);
 428
 429         for (i = 0; i < adapter->priv_num; i++)
 430                 list_del(&adapter->bss_prio_tbl[i].bss_prio_head);
 431
 432         for (i = 0; i < adapter->priv_num; i++) {
 433                 if (adapter->priv[i]) {
 434                         priv = adapter->priv[i];
 435                         for (j = 0; j < MAX_NUM_TID; ++j)
 436                                 list_del(&priv->wmm.tid_tbl_ptr[j].ra_list);
 437                         list_del(&priv->tx_ba_stream_tbl_ptr);
 438                         list_del(&priv->rx_reorder_tbl_ptr);
 439                         list_del(&priv->sta_list);
 440                 }
 441         }
 442 }
 443
 444 /*
 445  * This function frees the adapter structure.
 446  *
 447  * The freeing operation is done recursively, by canceling all
 448  * pending commands, freeing the member buffers previously
 449  * allocated (command buffers, scan table buffer, sleep confirm
 450  * command buffer), stopping the timers and calling the cleanup
 451  * routines for every interface, before the actual adapter
 452  * structure is freed.
 453  */
 454 static void
 455 mwifiex_free_adapter(struct mwifiex_adapter *adapter)
 456 {
 457         if (!adapter) {
 458                 pr_err("%s: adapter is NULL\n", __func__);
 459                 return;
 460         }
 461
 462         mwifiex_cancel_all_pending_cmd(adapter);
 463
 464         /* Free lock variables */
 465         mwifiex_free_lock_list(adapter);
 466
 467         /* Free command buffer */
 468         dev_dbg(adapter->dev, "info: free cmd buffer\n");
 469         mwifiex_free_cmd_buffer(adapter);
 470
 471         del_timer(&adapter->cmd_timer);
 472
 473         dev_dbg(adapter->dev, "info: free scan table\n");
 474
 475         if (adapter->if_ops.cleanup_if)
 476                 adapter->if_ops.cleanup_if(adapter);
 477
 478         if (adapter->sleep_cfm)
 479                 dev_kfree_skb_any(adapter->sleep_cfm);
 480 }
 481
 482 /*
 483  *  This function intializes the lock variables and
 484  *  the list heads.
 485  */
 486 int mwifiex_init_lock_list(struct mwifiex_adapter *adapter)
 487 {
 488         struct mwifiex_private *priv;
 489         s32 i, j;
 490
 491         spin_lock_init(&adapter->mwifiex_lock);
 492         spin_lock_init(&adapter->int_lock);
 493         spin_lock_init(&adapter->main_proc_lock);
 494         spin_lock_init(&adapter->mwifiex_cmd_lock);
 495         spin_lock_init(&adapter->queue_lock);
 496         for (i = 0; i < adapter->priv_num; i++) {
 497                 if (adapter->priv[i]) {
 498                         priv = adapter->priv[i];
 499                         spin_lock_init(&priv->rx_pkt_lock);
 500                         spin_lock_init(&priv->wmm.ra_list_spinlock);
 501                         spin_lock_init(&priv->curr_bcn_buf_lock);
 502                         spin_lock_init(&priv->sta_list_spinlock);
 503                 }
 504         }
 505
 506         /* Initialize cmd_free_q */
 507         INIT_LIST_HEAD(&adapter->cmd_free_q);
 508         /* Initialize cmd_pending_q */
 509         INIT_LIST_HEAD(&adapter->cmd_pending_q);
 510         /* Initialize scan_pending_q */
 511         INIT_LIST_HEAD(&adapter->scan_pending_q);
 512
 513         spin_lock_init(&adapter->cmd_free_q_lock);
 514         spin_lock_init(&adapter->cmd_pending_q_lock);
 515         spin_lock_init(&adapter->scan_pending_q_lock);
 516
 517         skb_queue_head_init(&adapter->usb_rx_data_q);
 518
 519         for (i = 0; i < adapter->priv_num; ++i) {
 520                 INIT_LIST_HEAD(&adapter->bss_prio_tbl[i].bss_prio_head);
 521                 adapter->bss_prio_tbl[i].bss_prio_cur = NULL;
 522                 spin_lock_init(&adapter->bss_prio_tbl[i].bss_prio_lock);
 523         }
 524
 525         for (i = 0; i < adapter->priv_num; i++) {
 526                 if (!adapter->priv[i])
 527                         continue;
 528                 priv = adapter->priv[i];
 529                 for (j = 0; j < MAX_NUM_TID; ++j) {
 530                         INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[j].ra_list);
 531                         spin_lock_init(&priv->wmm.tid_tbl_ptr[j].tid_tbl_lock);
 532                 }
 533                 INIT_LIST_HEAD(&priv->tx_ba_stream_tbl_ptr);
 534                 INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
 535                 INIT_LIST_HEAD(&priv->sta_list);
 536
 537                 spin_lock_init(&priv->tx_ba_stream_tbl_lock);
 538                 spin_lock_init(&priv->rx_reorder_tbl_lock);
 539         }
 540
 541         return 0;
 542 }
 543
 544 /*
 545  * This function initializes the firmware.
 546  *
 547  * The following operations are performed sequentially -
 548  *      - Allocate adapter structure
 549  *      - Initialize the adapter structure
 550  *      - Initialize the private structure
 551  *      - Add BSS priority tables to the adapter structure
 552  *      - For each interface, send the init commands to firmware
 553  *      - Send the first command in command pending queue, if available
 554  */
 555 int mwifiex_init_fw(struct mwifiex_adapter *adapter)
 556 {
 557         int ret;
 558         struct mwifiex_private *priv;
 559         u8 i, first_sta = true;
 560         int is_cmd_pend_q_empty;
 561         unsigned long flags;
 562
 563         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 564
 565         /* Allocate memory for member of adapter structure */
 566         ret = mwifiex_allocate_adapter(adapter);
 567         if (ret)
 568                 return -1;
 569
 570         /* Initialize adapter structure */
 571         mwifiex_init_adapter(adapter);
 572
 573         for (i = 0; i < adapter->priv_num; i++) {
 574                 if (adapter->priv[i]) {
 575                         priv = adapter->priv[i];
 576
 577                         /* Initialize private structure */
 578                         ret = mwifiex_init_priv(priv);
 579                         if (ret)
 580                                 return -1;
 581                 }
 582         }
 583         for (i = 0; i < adapter->priv_num; i++) {
 584                 if (adapter->priv[i]) {
 585                         ret = mwifiex_sta_init_cmd(adapter->priv[i], first_sta);
 586                         if (ret == -1)
 587                                 return -1;
 588
 589                         first_sta = false;
 590                 }
 591         }
 592
 593         spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
 594         is_cmd_pend_q_empty = list_empty(&adapter->cmd_pending_q);
 595         spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);
 596         if (!is_cmd_pend_q_empty) {
 597                 /* Send the first command in queue and return */
 598                 if (mwifiex_main_process(adapter) != -1)
 599                         ret = -EINPROGRESS;
 600         } else {
 601                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 602         }
 603
 604         return ret;
 605 }
 606
 607 /*
 608  * This function deletes the BSS priority tables.
 609  *
 610  * The function traverses through all the allocated BSS priority nodes
 611  * in every BSS priority table and frees them.
 612  */
 613 static void mwifiex_delete_bss_prio_tbl(struct mwifiex_private *priv)
 614 {
 615         int i;
 616         struct mwifiex_adapter *adapter = priv->adapter;
 617         struct mwifiex_bss_prio_node *bssprio_node, *tmp_node, **cur;
 618         struct list_head *head;
 619         spinlock_t *lock; /* bss priority lock */
 620         unsigned long flags;
 621
 622         for (i = 0; i < adapter->priv_num; ++i) {
 623                 head = &adapter->bss_prio_tbl[i].bss_prio_head;
 624                 cur = &adapter->bss_prio_tbl[i].bss_prio_cur;
 625                 lock = &adapter->bss_prio_tbl[i].bss_prio_lock;
 626                 dev_dbg(adapter->dev, "info: delete BSS priority table,"
 627                                 " bss_type = %d, bss_num = %d, i = %d,"
 628                                 " head = %p, cur = %p\n",
 629                               priv->bss_type, priv->bss_num, i, head, *cur);
 630                 if (*cur) {
 631                         spin_lock_irqsave(lock, flags);
 632                         if (list_empty(head)) {
 633                                 spin_unlock_irqrestore(lock, flags);
 634                                 continue;
 635                         }
 636                         bssprio_node = list_first_entry(head,
 637                                         struct mwifiex_bss_prio_node, list);
 638                         spin_unlock_irqrestore(lock, flags);
 639
 640                         list_for_each_entry_safe(bssprio_node, tmp_node, head,
 641                                                  list) {
 642                                 if (bssprio_node->priv == priv) {
 643                                         dev_dbg(adapter->dev, "info: Delete "
 644                                                 "node %p, next = %p\n",
 645                                                 bssprio_node, tmp_node);
 646                                         spin_lock_irqsave(lock, flags);
 647                                         list_del(&bssprio_node->list);
 648                                         spin_unlock_irqrestore(lock, flags);
 649                                         kfree(bssprio_node);
 650                                 }
 651                         }
 652                         *cur = (struct mwifiex_bss_prio_node *)head;
 653                 }
 654         }
 655 }
 656
 657 /*
 658  * This function frees the private structure, including cleans
 659  * up the TX and RX queues and frees the BSS priority tables.
 660  */
 661 void mwifiex_free_priv(struct mwifiex_private *priv)
 662 {
 663         mwifiex_clean_txrx(priv);
 664         mwifiex_delete_bss_prio_tbl(priv);
 665         mwifiex_free_curr_bcn(priv);
 666 }
 667
 668 /*
 669  * This function is used to shutdown the driver.
 670  *
 671  * The following operations are performed sequentially -
 672  *      - Check if already shut down
 673  *      - Make sure the main process has stopped
 674  *      - Clean up the Tx and Rx queues
 675  *      - Delete BSS priority tables
 676  *      - Free the adapter
 677  *      - Notify completion
 678  */
 679 int
 680 mwifiex_shutdown_drv(struct mwifiex_adapter *adapter)
 681 {
 682         int ret = -EINPROGRESS;
 683         struct mwifiex_private *priv;
 684         s32 i;
 685         unsigned long flags;
 686         struct sk_buff *skb;
 687
 688         /* mwifiex already shutdown */
 689         if (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY)
 690                 return 0;
 691
 692         adapter->hw_status = MWIFIEX_HW_STATUS_CLOSING;
 693         /* wait for mwifiex_process to complete */
 694         if (adapter->mwifiex_processing) {
 695                 dev_warn(adapter->dev, "main process is still running\n");
 696                 return ret;
 697         }
 698
 699         /* shut down mwifiex */
 700         dev_dbg(adapter->dev, "info: shutdown mwifiex...\n");
 701
 702         /* Clean up Tx/Rx queues and delete BSS priority table */
 703         for (i = 0; i < adapter->priv_num; i++) {
 704                 if (adapter->priv[i]) {
 705                         priv = adapter->priv[i];
 706
 707                         mwifiex_clean_txrx(priv);
 708                         mwifiex_delete_bss_prio_tbl(priv);
 709                 }
 710         }
 711
 712         spin_lock_irqsave(&adapter->mwifiex_lock, flags);
 713
 714         if (adapter->if_ops.data_complete) {
 715                 while ((skb = skb_dequeue(&adapter->usb_rx_data_q))) {
 716                         struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
 717
 718                         priv = adapter->priv[rx_info->bss_num];
 719                         if (priv)
 720                                 priv->stats.rx_dropped++;
 721
 722                         adapter->if_ops.data_complete(adapter, skb);
 723                 }
 724         }
 725
 726         /* Free adapter structure */
 727         mwifiex_free_adapter(adapter);
 728
 729         spin_unlock_irqrestore(&adapter->mwifiex_lock, flags);
 730
 731         /* Notify completion */
 732         ret = mwifiex_shutdown_fw_complete(adapter);
 733
 734         return ret;
 735 }
 736
 737 /*
 738  * This function downloads the firmware to the card.
 739  *
 740  * The actual download is preceded by two sanity checks -
 741  *      - Check if firmware is already running
 742  *      - Check if the interface is the winner to download the firmware
 743  *
 744  * ...and followed by another -
 745  *      - Check if the firmware is downloaded successfully
 746  *
 747  * After download is successfully completed, the host interrupts are enabled.
 748  */
 749 int mwifiex_dnld_fw(struct mwifiex_adapter *adapter,
 750                     struct mwifiex_fw_image *pmfw)
 751 {
 752         int ret;
 753         u32 poll_num = 1;
 754
 755         if (adapter->if_ops.check_fw_status) {
 756                 adapter->winner = 0;
 757
 758                 /* check if firmware is already running */
 759                 ret = adapter->if_ops.check_fw_status(adapter, poll_num);
 760                 if (!ret) {
 761                         dev_notice(adapter->dev,
 762                                    "WLAN FW already running! Skip FW dnld\n");
 763                         goto done;
 764                 }
 765
 766                 poll_num = MAX_FIRMWARE_POLL_TRIES;
 767
 768                 /* check if we are the winner for downloading FW */
 769                 if (!adapter->winner) {
 770                         dev_notice(adapter->dev,
 771                                    "FW already running! Skip FW dnld\n");
 772                         poll_num = MAX_MULTI_INTERFACE_POLL_TRIES;
 773                         goto poll_fw;
 774                 }
 775         }
 776
 777         if (pmfw) {
 778                 /* Download firmware with helper */
 779                 ret = adapter->if_ops.prog_fw(adapter, pmfw);
 780                 if (ret) {
 781                         dev_err(adapter->dev, "prog_fw failed ret=%#x\n", ret);
 782                         return ret;
 783                 }
 784         }
 785
 786 poll_fw:
 787         /* Check if the firmware is downloaded successfully or not */
 788         ret = adapter->if_ops.check_fw_status(adapter, poll_num);
 789         if (ret) {
 790                 dev_err(adapter->dev, "FW failed to be active in time\n");
 791                 return -1;
 792         }
 793 done:
 794         /* re-enable host interrupt for mwifiex after fw dnld is successful */
 795         if (adapter->if_ops.enable_int)
 796                 adapter->if_ops.enable_int(adapter);
 797
 798         return ret;
 799 }