drivers/net/wireless/mwifiex/main.c

   1 /*
   2  * Marvell Wireless LAN device driver: major functions
   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 "main.h"
  21 #include "wmm.h"
  22 #include "cfg80211.h"
  23 #include "11n.h"
  24
  25 #define VERSION "1.0"
  26
  27 const char driver_version[] = "mwifiex " VERSION " (%s) ";
  28
  29 /*
  30  * This function registers the device and performs all the necessary
  31  * initializations.
  32  *
  33  * The following initialization operations are performed -
  34  *      - Allocate adapter structure
  35  *      - Save interface specific operations table in adapter
  36  *      - Call interface specific initialization routine
  37  *      - Allocate private structures
  38  *      - Set default adapter structure parameters
  39  *      - Initialize locks
  40  *
  41  * In case of any errors during inittialization, this function also ensures
  42  * proper cleanup before exiting.
  43  */
  44 static int mwifiex_register(void *card, struct mwifiex_if_ops *if_ops,
  45                             void **padapter)
  46 {
  47         struct mwifiex_adapter *adapter;
  48         int i;
  49
  50         adapter = kzalloc(sizeof(struct mwifiex_adapter), GFP_KERNEL);
  51         if (!adapter)
  52                 return -ENOMEM;
  53
  54         *padapter = adapter;
  55         adapter->card = card;
  56
  57         /* Save interface specific operations in adapter */
  58         memmove(&adapter->if_ops, if_ops, sizeof(struct mwifiex_if_ops));
  59
  60         /* card specific initialization has been deferred until now .. */
  61         if (adapter->if_ops.init_if)
  62                 if (adapter->if_ops.init_if(adapter))
  63                         goto error;
  64
  65         adapter->priv_num = 0;
  66
  67         for (i = 0; i < MWIFIEX_MAX_BSS_NUM; i++) {
  68                 /* Allocate memory for private structure */
  69                 adapter->priv[i] =
  70                         kzalloc(sizeof(struct mwifiex_private), GFP_KERNEL);
  71                 if (!adapter->priv[i])
  72                         goto error;
  73
  74                 adapter->priv[i]->adapter = adapter;
  75                 adapter->priv_num++;
  76         }
  77         mwifiex_init_lock_list(adapter);
  78
  79         init_timer(&adapter->cmd_timer);
  80         adapter->cmd_timer.function = mwifiex_cmd_timeout_func;
  81         adapter->cmd_timer.data = (unsigned long) adapter;
  82
  83         return 0;
  84
  85 error:
  86         dev_dbg(adapter->dev, "info: leave mwifiex_register with error\n");
  87
  88         for (i = 0; i < adapter->priv_num; i++)
  89                 kfree(adapter->priv[i]);
  90
  91         kfree(adapter);
  92
  93         return -1;
  94 }
  95
  96 /*
  97  * This function unregisters the device and performs all the necessary
  98  * cleanups.
  99  *
 100  * The following cleanup operations are performed -
 101  *      - Free the timers
 102  *      - Free beacon buffers
 103  *      - Free private structures
 104  *      - Free adapter structure
 105  */
 106 static int mwifiex_unregister(struct mwifiex_adapter *adapter)
 107 {
 108         s32 i;
 109
 110         del_timer(&adapter->cmd_timer);
 111
 112         /* Free private structures */
 113         for (i = 0; i < adapter->priv_num; i++) {
 114                 if (adapter->priv[i]) {
 115                         mwifiex_free_curr_bcn(adapter->priv[i]);
 116                         kfree(adapter->priv[i]);
 117                 }
 118         }
 119
 120         kfree(adapter);
 121         return 0;
 122 }
 123
 124 /*
 125  * The main process.
 126  *
 127  * This function is the main procedure of the driver and handles various driver
 128  * operations. It runs in a loop and provides the core functionalities.
 129  *
 130  * The main responsibilities of this function are -
 131  *      - Ensure concurrency control
 132  *      - Handle pending interrupts and call interrupt handlers
 133  *      - Wake up the card if required
 134  *      - Handle command responses and call response handlers
 135  *      - Handle events and call event handlers
 136  *      - Execute pending commands
 137  *      - Transmit pending data packets
 138  */
 139 int mwifiex_main_process(struct mwifiex_adapter *adapter)
 140 {
 141         int ret = 0;
 142         unsigned long flags;
 143         struct sk_buff *skb;
 144
 145         spin_lock_irqsave(&adapter->main_proc_lock, flags);
 146
 147         /* Check if already processing */
 148         if (adapter->mwifiex_processing) {
 149                 spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 150                 goto exit_main_proc;
 151         } else {
 152                 adapter->mwifiex_processing = true;
 153                 spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 154         }
 155 process_start:
 156         do {
 157                 if ((adapter->hw_status == MWIFIEX_HW_STATUS_CLOSING) ||
 158                     (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY))
 159                         break;
 160
 161                 /* Handle pending interrupt if any */
 162                 if (adapter->int_status) {
 163                         if (adapter->hs_activated)
 164                                 mwifiex_process_hs_config(adapter);
 165                         if (adapter->if_ops.process_int_status)
 166                                 adapter->if_ops.process_int_status(adapter);
 167                 }
 168
 169                 /* Need to wake up the card ? */
 170                 if ((adapter->ps_state == PS_STATE_SLEEP) &&
 171                     (adapter->pm_wakeup_card_req &&
 172                      !adapter->pm_wakeup_fw_try) &&
 173                     (is_command_pending(adapter) ||
 174                      !mwifiex_wmm_lists_empty(adapter))) {
 175                         adapter->pm_wakeup_fw_try = true;
 176                         adapter->if_ops.wakeup(adapter);
 177                         continue;
 178                 }
 179
 180                 if (IS_CARD_RX_RCVD(adapter)) {
 181                         adapter->pm_wakeup_fw_try = false;
 182                         if (adapter->ps_state == PS_STATE_SLEEP)
 183                                 adapter->ps_state = PS_STATE_AWAKE;
 184                 } else {
 185                         /* We have tried to wakeup the card already */
 186                         if (adapter->pm_wakeup_fw_try)
 187                                 break;
 188                         if (adapter->ps_state != PS_STATE_AWAKE ||
 189                             adapter->tx_lock_flag)
 190                                 break;
 191
 192                         if ((adapter->scan_processing &&
 193                              !adapter->scan_delay_cnt) || adapter->data_sent ||
 194                             mwifiex_wmm_lists_empty(adapter)) {
 195                                 if (adapter->cmd_sent || adapter->curr_cmd ||
 196                                     (!is_command_pending(adapter)))
 197                                         break;
 198                         }
 199                 }
 200
 201                 /* Check Rx data for USB */
 202                 if (adapter->iface_type == MWIFIEX_USB)
 203                         while ((skb = skb_dequeue(&adapter->usb_rx_data_q)))
 204                                 mwifiex_handle_rx_packet(adapter, skb);
 205
 206                 /* Check for Cmd Resp */
 207                 if (adapter->cmd_resp_received) {
 208                         adapter->cmd_resp_received = false;
 209                         mwifiex_process_cmdresp(adapter);
 210
 211                         /* call mwifiex back when init_fw is done */
 212                         if (adapter->hw_status == MWIFIEX_HW_STATUS_INIT_DONE) {
 213                                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 214                                 mwifiex_init_fw_complete(adapter);
 215                         }
 216                 }
 217
 218                 /* Check for event */
 219                 if (adapter->event_received) {
 220                         adapter->event_received = false;
 221                         mwifiex_process_event(adapter);
 222                 }
 223
 224                 /* Check if we need to confirm Sleep Request
 225                    received previously */
 226                 if (adapter->ps_state == PS_STATE_PRE_SLEEP) {
 227                         if (!adapter->cmd_sent && !adapter->curr_cmd)
 228                                 mwifiex_check_ps_cond(adapter);
 229                 }
 230
 231                 /* * The ps_state may have been changed during processing of
 232                  * Sleep Request event.
 233                  */
 234                 if ((adapter->ps_state == PS_STATE_SLEEP) ||
 235                     (adapter->ps_state == PS_STATE_PRE_SLEEP) ||
 236                     (adapter->ps_state == PS_STATE_SLEEP_CFM) ||
 237                     adapter->tx_lock_flag)
 238                         continue;
 239
 240                 if (!adapter->cmd_sent && !adapter->curr_cmd) {
 241                         if (mwifiex_exec_next_cmd(adapter) == -1) {
 242                                 ret = -1;
 243                                 break;
 244                         }
 245                 }
 246
 247                 if ((!adapter->scan_processing || adapter->scan_delay_cnt) &&
 248                     !adapter->data_sent && !mwifiex_wmm_lists_empty(adapter)) {
 249                         mwifiex_wmm_process_tx(adapter);
 250                         if (adapter->hs_activated) {
 251                                 adapter->is_hs_configured = false;
 252                                 mwifiex_hs_activated_event
 253                                         (mwifiex_get_priv
 254                                          (adapter, MWIFIEX_BSS_ROLE_ANY),
 255                                          false);
 256                         }
 257                 }
 258
 259                 if (adapter->delay_null_pkt && !adapter->cmd_sent &&
 260                     !adapter->curr_cmd && !is_command_pending(adapter) &&
 261                     mwifiex_wmm_lists_empty(adapter)) {
 262                         if (!mwifiex_send_null_packet
 263                             (mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_STA),
 264                              MWIFIEX_TxPD_POWER_MGMT_NULL_PACKET |
 265                              MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET)) {
 266                                 adapter->delay_null_pkt = false;
 267                                 adapter->ps_state = PS_STATE_SLEEP;
 268                         }
 269                         break;
 270                 }
 271         } while (true);
 272
 273         if ((adapter->int_status) || IS_CARD_RX_RCVD(adapter))
 274                 goto process_start;
 275
 276         spin_lock_irqsave(&adapter->main_proc_lock, flags);
 277         adapter->mwifiex_processing = false;
 278         spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 279
 280 exit_main_proc:
 281         if (adapter->hw_status == MWIFIEX_HW_STATUS_CLOSING)
 282                 mwifiex_shutdown_drv(adapter);
 283         return ret;
 284 }
 285 EXPORT_SYMBOL_GPL(mwifiex_main_process);
 286
 287 /*
 288  * This function frees the adapter structure.
 289  *
 290  * Additionally, this closes the netlink socket, frees the timers
 291  * and private structures.
 292  */
 293 static void mwifiex_free_adapter(struct mwifiex_adapter *adapter)
 294 {
 295         if (!adapter) {
 296                 pr_err("%s: adapter is NULL\n", __func__);
 297                 return;
 298         }
 299
 300         mwifiex_unregister(adapter);
 301         pr_debug("info: %s: free adapter\n", __func__);
 302 }
 303
 304 /*
 305  * This function gets firmware and initializes it.
 306  *
 307  * The main initialization steps followed are -
 308  *      - Download the correct firmware to card
 309  *      - Issue the init commands to firmware
 310  */
 311 static void mwifiex_fw_dpc(const struct firmware *firmware, void *context)
 312 {
 313         int ret;
 314         char fmt[64];
 315         struct mwifiex_private *priv;
 316         struct mwifiex_adapter *adapter = context;
 317         struct mwifiex_fw_image fw;
 318
 319         if (!firmware) {
 320                 dev_err(adapter->dev,
 321                         "Failed to get firmware %s\n", adapter->fw_name);
 322                 goto done;
 323         }
 324
 325         memset(&fw, 0, sizeof(struct mwifiex_fw_image));
 326         adapter->firmware = firmware;
 327         fw.fw_buf = (u8 *) adapter->firmware->data;
 328         fw.fw_len = adapter->firmware->size;
 329
 330         if (adapter->if_ops.dnld_fw)
 331                 ret = adapter->if_ops.dnld_fw(adapter, &fw);
 332         else
 333                 ret = mwifiex_dnld_fw(adapter, &fw);
 334         if (ret == -1)
 335                 goto done;
 336
 337         dev_notice(adapter->dev, "WLAN FW is active\n");
 338
 339         adapter->init_wait_q_woken = false;
 340         ret = mwifiex_init_fw(adapter);
 341         if (ret == -1) {
 342                 goto done;
 343         } else if (!ret) {
 344                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 345                 goto done;
 346         }
 347         /* Wait for mwifiex_init to complete */
 348         wait_event_interruptible(adapter->init_wait_q,
 349                                  adapter->init_wait_q_woken);
 350         if (adapter->hw_status != MWIFIEX_HW_STATUS_READY)
 351                 goto done;
 352
 353         priv = adapter->priv[MWIFIEX_BSS_ROLE_STA];
 354         if (mwifiex_register_cfg80211(adapter)) {
 355                 dev_err(adapter->dev, "cannot register with cfg80211\n");
 356                 goto err_init_fw;
 357         }
 358
 359         rtnl_lock();
 360         /* Create station interface by default */
 361         if (!mwifiex_add_virtual_intf(adapter->wiphy, "mlan%d",
 362                                       NL80211_IFTYPE_STATION, NULL, NULL)) {
 363                 dev_err(adapter->dev, "cannot create default STA interface\n");
 364                 goto err_add_intf;
 365         }
 366
 367         /* Create AP interface by default */
 368         if (!mwifiex_add_virtual_intf(adapter->wiphy, "uap%d",
 369                                       NL80211_IFTYPE_AP, NULL, NULL)) {
 370                 dev_err(adapter->dev, "cannot create default AP interface\n");
 371                 goto err_add_intf;
 372         }
 373
 374         /* Create P2P interface by default */
 375         if (!mwifiex_add_virtual_intf(adapter->wiphy, "p2p%d",
 376                                       NL80211_IFTYPE_P2P_CLIENT, NULL, NULL)) {
 377                 dev_err(adapter->dev, "cannot create default P2P interface\n");
 378                 goto err_add_intf;
 379         }
 380         rtnl_unlock();
 381
 382         mwifiex_drv_get_driver_version(adapter, fmt, sizeof(fmt) - 1);
 383         dev_notice(adapter->dev, "driver_version = %s\n", fmt);
 384         goto done;
 385
 386 err_add_intf:
 387         mwifiex_del_virtual_intf(adapter->wiphy, priv->wdev);
 388         rtnl_unlock();
 389 err_init_fw:
 390         pr_debug("info: %s: unregister device\n", __func__);
 391         adapter->if_ops.unregister_dev(adapter);
 392 done:
 393         release_firmware(adapter->firmware);
 394         complete(&adapter->fw_load);
 395         return;
 396 }
 397
 398 /*
 399  * This function initializes the hardware and gets firmware.
 400  */
 401 static int mwifiex_init_hw_fw(struct mwifiex_adapter *adapter)
 402 {
 403         int ret;
 404
 405         init_completion(&adapter->fw_load);
 406         ret = request_firmware_nowait(THIS_MODULE, 1, adapter->fw_name,
 407                                       adapter->dev, GFP_KERNEL, adapter,
 408                                       mwifiex_fw_dpc);
 409         if (ret < 0)
 410                 dev_err(adapter->dev,
 411                         "request_firmware_nowait() returned error %d\n", ret);
 412         return ret;
 413 }
 414
 415 /*
 416  * CFG802.11 network device handler for open.
 417  *
 418  * Starts the data queue.
 419  */
 420 static int
 421 mwifiex_open(struct net_device *dev)
 422 {
 423         netif_tx_start_all_queues(dev);
 424         return 0;
 425 }
 426
 427 /*
 428  * CFG802.11 network device handler for close.
 429  */
 430 static int
 431 mwifiex_close(struct net_device *dev)
 432 {
 433         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 434
 435         if (priv->scan_request) {
 436                 dev_dbg(priv->adapter->dev, "aborting scan on ndo_stop\n");
 437                 cfg80211_scan_done(priv->scan_request, 1);
 438                 priv->scan_request = NULL;
 439         }
 440
 441         return 0;
 442 }
 443
 444 /*
 445  * Add buffer into wmm tx queue and queue work to transmit it.
 446  */
 447 int mwifiex_queue_tx_pkt(struct mwifiex_private *priv, struct sk_buff *skb)
 448 {
 449         struct netdev_queue *txq;
 450         int index = mwifiex_1d_to_wmm_queue[skb->priority];
 451
 452         if (atomic_inc_return(&priv->wmm_tx_pending[index]) >= MAX_TX_PENDING) {
 453                 txq = netdev_get_tx_queue(priv->netdev, index);
 454                 if (!netif_tx_queue_stopped(txq)) {
 455                         netif_tx_stop_queue(txq);
 456                         dev_dbg(priv->adapter->dev, "stop queue: %d\n", index);
 457                 }
 458         }
 459
 460         atomic_inc(&priv->adapter->tx_pending);
 461         mwifiex_wmm_add_buf_txqueue(priv, skb);
 462
 463         if (priv->adapter->scan_delay_cnt)
 464                 atomic_set(&priv->adapter->is_tx_received, true);
 465
 466         queue_work(priv->adapter->workqueue, &priv->adapter->main_work);
 467
 468         return 0;
 469 }
 470
 471 /*
 472  * CFG802.11 network device handler for data transmission.
 473  */
 474 static int
 475 mwifiex_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 476 {
 477         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 478         struct sk_buff *new_skb;
 479         struct mwifiex_txinfo *tx_info;
 480         struct timeval tv;
 481
 482         dev_dbg(priv->adapter->dev, "data: %lu BSS(%d-%d): Data <= kernel\n",
 483                 jiffies, priv->bss_type, priv->bss_num);
 484
 485         if (priv->adapter->surprise_removed) {
 486                 kfree_skb(skb);
 487                 priv->stats.tx_dropped++;
 488                 return 0;
 489         }
 490         if (!skb->len || (skb->len > ETH_FRAME_LEN)) {
 491                 dev_err(priv->adapter->dev, "Tx: bad skb len %d\n", skb->len);
 492                 kfree_skb(skb);
 493                 priv->stats.tx_dropped++;
 494                 return 0;
 495         }
 496         if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
 497                 dev_dbg(priv->adapter->dev,
 498                         "data: Tx: insufficient skb headroom %d\n",
 499                         skb_headroom(skb));
 500                 /* Insufficient skb headroom - allocate a new skb */
 501                 new_skb =
 502                         skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
 503                 if (unlikely(!new_skb)) {
 504                         dev_err(priv->adapter->dev, "Tx: cannot alloca new_skb\n");
 505                         kfree_skb(skb);
 506                         priv->stats.tx_dropped++;
 507                         return 0;
 508                 }
 509                 kfree_skb(skb);
 510                 skb = new_skb;
 511                 dev_dbg(priv->adapter->dev, "info: new skb headroomd %d\n",
 512                         skb_headroom(skb));
 513         }
 514
 515         tx_info = MWIFIEX_SKB_TXCB(skb);
 516         tx_info->bss_num = priv->bss_num;
 517         tx_info->bss_type = priv->bss_type;
 518
 519         /* Record the current time the packet was queued; used to
 520          * determine the amount of time the packet was queued in
 521          * the driver before it was sent to the firmware.
 522          * The delay is then sent along with the packet to the
 523          * firmware for aggregate delay calculation for stats and
 524          * MSDU lifetime expiry.
 525          */
 526         do_gettimeofday(&tv);
 527         skb->tstamp = timeval_to_ktime(tv);
 528
 529         mwifiex_queue_tx_pkt(priv, skb);
 530
 531         return 0;
 532 }
 533
 534 /*
 535  * CFG802.11 network device handler for setting MAC address.
 536  */
 537 static int
 538 mwifiex_set_mac_address(struct net_device *dev, void *addr)
 539 {
 540         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 541         struct sockaddr *hw_addr = addr;
 542         int ret;
 543
 544         memcpy(priv->curr_addr, hw_addr->sa_data, ETH_ALEN);
 545
 546         /* Send request to firmware */
 547         ret = mwifiex_send_cmd_sync(priv, HostCmd_CMD_802_11_MAC_ADDRESS,
 548                                     HostCmd_ACT_GEN_SET, 0, NULL);
 549
 550         if (!ret)
 551                 memcpy(priv->netdev->dev_addr, priv->curr_addr, ETH_ALEN);
 552         else
 553                 dev_err(priv->adapter->dev,
 554                         "set mac address failed: ret=%d\n", ret);
 555
 556         memcpy(dev->dev_addr, priv->curr_addr, ETH_ALEN);
 557
 558         return ret;
 559 }
 560
 561 /*
 562  * CFG802.11 network device handler for setting multicast list.
 563  */
 564 static void mwifiex_set_multicast_list(struct net_device *dev)
 565 {
 566         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 567         struct mwifiex_multicast_list mcast_list;
 568
 569         if (dev->flags & IFF_PROMISC) {
 570                 mcast_list.mode = MWIFIEX_PROMISC_MODE;
 571         } else if (dev->flags & IFF_ALLMULTI ||
 572                    netdev_mc_count(dev) > MWIFIEX_MAX_MULTICAST_LIST_SIZE) {
 573                 mcast_list.mode = MWIFIEX_ALL_MULTI_MODE;
 574         } else {
 575                 mcast_list.mode = MWIFIEX_MULTICAST_MODE;
 576                 if (netdev_mc_count(dev))
 577                         mcast_list.num_multicast_addr =
 578                                 mwifiex_copy_mcast_addr(&mcast_list, dev);
 579         }
 580         mwifiex_request_set_multicast_list(priv, &mcast_list);
 581 }
 582
 583 /*
 584  * CFG802.11 network device handler for transmission timeout.
 585  */
 586 static void
 587 mwifiex_tx_timeout(struct net_device *dev)
 588 {
 589         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 590
 591         dev_err(priv->adapter->dev, "%lu : Tx timeout, bss_type-num = %d-%d\n",
 592                 jiffies, priv->bss_type, priv->bss_num);
 593         mwifiex_set_trans_start(dev);
 594         priv->num_tx_timeout++;
 595 }
 596
 597 /*
 598  * CFG802.11 network device handler for statistics retrieval.
 599  */
 600 static struct net_device_stats *mwifiex_get_stats(struct net_device *dev)
 601 {
 602         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 603
 604         return &priv->stats;
 605 }
 606
 607 static u16
 608 mwifiex_netdev_select_wmm_queue(struct net_device *dev, struct sk_buff *skb)
 609 {
 610         skb->priority = cfg80211_classify8021d(skb);
 611         return mwifiex_1d_to_wmm_queue[skb->priority];
 612 }
 613
 614 /* Network device handlers */
 615 static const struct net_device_ops mwifiex_netdev_ops = {
 616         .ndo_open = mwifiex_open,
 617         .ndo_stop = mwifiex_close,
 618         .ndo_start_xmit = mwifiex_hard_start_xmit,
 619         .ndo_set_mac_address = mwifiex_set_mac_address,
 620         .ndo_tx_timeout = mwifiex_tx_timeout,
 621         .ndo_get_stats = mwifiex_get_stats,
 622         .ndo_set_rx_mode = mwifiex_set_multicast_list,
 623         .ndo_select_queue = mwifiex_netdev_select_wmm_queue,
 624 };
 625
 626 /*
 627  * This function initializes the private structure parameters.
 628  *
 629  * The following wait queues are initialized -
 630  *      - IOCTL wait queue
 631  *      - Command wait queue
 632  *      - Statistics wait queue
 633  *
 634  * ...and the following default parameters are set -
 635  *      - Current key index     : Set to 0
 636  *      - Rate index            : Set to auto
 637  *      - Media connected       : Set to disconnected
 638  *      - Adhoc link sensed     : Set to false
 639  *      - Nick name             : Set to null
 640  *      - Number of Tx timeout  : Set to 0
 641  *      - Device address        : Set to current address
 642  *
 643  * In addition, the CFG80211 work queue is also created.
 644  */
 645 void mwifiex_init_priv_params(struct mwifiex_private *priv,
 646                                                 struct net_device *dev)
 647 {
 648         dev->netdev_ops = &mwifiex_netdev_ops;
 649         /* Initialize private structure */
 650         priv->current_key_index = 0;
 651         priv->media_connected = false;
 652         memset(&priv->nick_name, 0, sizeof(priv->nick_name));
 653         memset(priv->mgmt_ie, 0,
 654                sizeof(struct mwifiex_ie) * MAX_MGMT_IE_INDEX);
 655         priv->beacon_idx = MWIFIEX_AUTO_IDX_MASK;
 656         priv->proberesp_idx = MWIFIEX_AUTO_IDX_MASK;
 657         priv->assocresp_idx = MWIFIEX_AUTO_IDX_MASK;
 658         priv->rsn_idx = MWIFIEX_AUTO_IDX_MASK;
 659         priv->num_tx_timeout = 0;
 660         memcpy(dev->dev_addr, priv->curr_addr, ETH_ALEN);
 661 }
 662
 663 /*
 664  * This function check if command is pending.
 665  */
 666 int is_command_pending(struct mwifiex_adapter *adapter)
 667 {
 668         unsigned long flags;
 669         int is_cmd_pend_q_empty;
 670
 671         spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
 672         is_cmd_pend_q_empty = list_empty(&adapter->cmd_pending_q);
 673         spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);
 674
 675         return !is_cmd_pend_q_empty;
 676 }
 677
 678 /*
 679  * This is the main work queue function.
 680  *
 681  * It handles the main process, which in turn handles the complete
 682  * driver operations.
 683  */
 684 static void mwifiex_main_work_queue(struct work_struct *work)
 685 {
 686         struct mwifiex_adapter *adapter =
 687                 container_of(work, struct mwifiex_adapter, main_work);
 688
 689         if (adapter->surprise_removed)
 690                 return;
 691         mwifiex_main_process(adapter);
 692 }
 693
 694 /*
 695  * This function cancels all works in the queue and destroys
 696  * the main workqueue.
 697  */
 698 static void
 699 mwifiex_terminate_workqueue(struct mwifiex_adapter *adapter)
 700 {
 701         flush_workqueue(adapter->workqueue);
 702         destroy_workqueue(adapter->workqueue);
 703         adapter->workqueue = NULL;
 704 }
 705
 706 /*
 707  * This function adds the card.
 708  *
 709  * This function follows the following major steps to set up the device -
 710  *      - Initialize software. This includes probing the card, registering
 711  *        the interface operations table, and allocating/initializing the
 712  *        adapter structure
 713  *      - Set up the netlink socket
 714  *      - Create and start the main work queue
 715  *      - Register the device
 716  *      - Initialize firmware and hardware
 717  *      - Add logical interfaces
 718  */
 719 int
 720 mwifiex_add_card(void *card, struct semaphore *sem,
 721                  struct mwifiex_if_ops *if_ops, u8 iface_type)
 722 {
 723         struct mwifiex_adapter *adapter;
 724
 725         if (down_interruptible(sem))
 726                 goto exit_sem_err;
 727
 728         if (mwifiex_register(card, if_ops, (void **)&adapter)) {
 729                 pr_err("%s: software init failed\n", __func__);
 730                 goto err_init_sw;
 731         }
 732
 733         adapter->iface_type = iface_type;
 734
 735         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 736         adapter->surprise_removed = false;
 737         init_waitqueue_head(&adapter->init_wait_q);
 738         adapter->is_suspended = false;
 739         adapter->hs_activated = false;
 740         init_waitqueue_head(&adapter->hs_activate_wait_q);
 741         adapter->cmd_wait_q_required = false;
 742         init_waitqueue_head(&adapter->cmd_wait_q.wait);
 743         adapter->cmd_wait_q.status = 0;
 744         adapter->scan_wait_q_woken = false;
 745
 746         adapter->workqueue = create_workqueue("MWIFIEX_WORK_QUEUE");
 747         if (!adapter->workqueue)
 748                 goto err_kmalloc;
 749
 750         INIT_WORK(&adapter->main_work, mwifiex_main_work_queue);
 751
 752         /* Register the device. Fill up the private data structure with relevant
 753            information from the card and request for the required IRQ. */
 754         if (adapter->if_ops.register_dev(adapter)) {
 755                 pr_err("%s: failed to register mwifiex device\n", __func__);
 756                 goto err_registerdev;
 757         }
 758
 759         if (mwifiex_init_hw_fw(adapter)) {
 760                 pr_err("%s: firmware init failed\n", __func__);
 761                 goto err_init_fw;
 762         }
 763
 764         up(sem);
 765         return 0;
 766
 767 err_init_fw:
 768         pr_debug("info: %s: unregister device\n", __func__);
 769         if (adapter->if_ops.unregister_dev)
 770                 adapter->if_ops.unregister_dev(adapter);
 771 err_registerdev:
 772         adapter->surprise_removed = true;
 773         mwifiex_terminate_workqueue(adapter);
 774 err_kmalloc:
 775         if ((adapter->hw_status == MWIFIEX_HW_STATUS_FW_READY) ||
 776             (adapter->hw_status == MWIFIEX_HW_STATUS_READY)) {
 777                 pr_debug("info: %s: shutdown mwifiex\n", __func__);
 778                 adapter->init_wait_q_woken = false;
 779
 780                 if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 781                         wait_event_interruptible(adapter->init_wait_q,
 782                                                  adapter->init_wait_q_woken);
 783         }
 784
 785         mwifiex_free_adapter(adapter);
 786
 787 err_init_sw:
 788         up(sem);
 789
 790 exit_sem_err:
 791         return -1;
 792 }
 793 EXPORT_SYMBOL_GPL(mwifiex_add_card);
 794
 795 /*
 796  * This function removes the card.
 797  *
 798  * This function follows the following major steps to remove the device -
 799  *      - Stop data traffic
 800  *      - Shutdown firmware
 801  *      - Remove the logical interfaces
 802  *      - Terminate the work queue
 803  *      - Unregister the device
 804  *      - Free the adapter structure
 805  */
 806 int mwifiex_remove_card(struct mwifiex_adapter *adapter, struct semaphore *sem)
 807 {
 808         struct mwifiex_private *priv = NULL;
 809         int i;
 810
 811         if (down_interruptible(sem))
 812                 goto exit_sem_err;
 813
 814         if (!adapter)
 815                 goto exit_remove;
 816
 817         adapter->surprise_removed = true;
 818
 819         /* Stop data */
 820         for (i = 0; i < adapter->priv_num; i++) {
 821                 priv = adapter->priv[i];
 822                 if (priv && priv->netdev) {
 823                         mwifiex_stop_net_dev_queue(priv->netdev, adapter);
 824                         if (netif_carrier_ok(priv->netdev))
 825                                 netif_carrier_off(priv->netdev);
 826                 }
 827         }
 828
 829         dev_dbg(adapter->dev, "cmd: calling mwifiex_shutdown_drv...\n");
 830         adapter->init_wait_q_woken = false;
 831
 832         if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 833                 wait_event_interruptible(adapter->init_wait_q,
 834                                          adapter->init_wait_q_woken);
 835         dev_dbg(adapter->dev, "cmd: mwifiex_shutdown_drv done\n");
 836         if (atomic_read(&adapter->rx_pending) ||
 837             atomic_read(&adapter->tx_pending) ||
 838             atomic_read(&adapter->cmd_pending)) {
 839                 dev_err(adapter->dev, "rx_pending=%d, tx_pending=%d, "
 840                        "cmd_pending=%d\n",
 841                        atomic_read(&adapter->rx_pending),
 842                        atomic_read(&adapter->tx_pending),
 843                        atomic_read(&adapter->cmd_pending));
 844         }
 845
 846         for (i = 0; i < adapter->priv_num; i++) {
 847                 priv = adapter->priv[i];
 848
 849                 if (!priv)
 850                         continue;
 851
 852                 rtnl_lock();
 853                 if (priv->wdev && priv->netdev)
 854                         mwifiex_del_virtual_intf(adapter->wiphy, priv->wdev);
 855                 rtnl_unlock();
 856         }
 857
 858         priv = adapter->priv[0];
 859         if (!priv || !priv->wdev)
 860                 goto exit_remove;
 861
 862         wiphy_unregister(priv->wdev->wiphy);
 863         wiphy_free(priv->wdev->wiphy);
 864
 865         for (i = 0; i < adapter->priv_num; i++) {
 866                 priv = adapter->priv[i];
 867                 if (priv)
 868                         kfree(priv->wdev);
 869         }
 870
 871         mwifiex_terminate_workqueue(adapter);
 872
 873         /* Unregister device */
 874         dev_dbg(adapter->dev, "info: unregister device\n");
 875         if (adapter->if_ops.unregister_dev)
 876                 adapter->if_ops.unregister_dev(adapter);
 877         /* Free adapter structure */
 878         dev_dbg(adapter->dev, "info: free adapter\n");
 879         mwifiex_free_adapter(adapter);
 880
 881 exit_remove:
 882         up(sem);
 883 exit_sem_err:
 884         return 0;
 885 }
 886 EXPORT_SYMBOL_GPL(mwifiex_remove_card);
 887
 888 /*
 889  * This function initializes the module.
 890  *
 891  * The debug FS is also initialized if configured.
 892  */
 893 static int
 894 mwifiex_init_module(void)
 895 {
 896 #ifdef CONFIG_DEBUG_FS
 897         mwifiex_debugfs_init();
 898 #endif
 899         return 0;
 900 }
 901
 902 /*
 903  * This function cleans up the module.
 904  *
 905  * The debug FS is removed if available.
 906  */
 907 static void
 908 mwifiex_cleanup_module(void)
 909 {
 910 #ifdef CONFIG_DEBUG_FS
 911         mwifiex_debugfs_remove();
 912 #endif
 913 }
 914
 915 module_init(mwifiex_init_module);
 916 module_exit(mwifiex_cleanup_module);
 917
 918 MODULE_AUTHOR("Marvell International Ltd.");
 919 MODULE_DESCRIPTION("Marvell WiFi-Ex Driver version " VERSION);
 920 MODULE_VERSION(VERSION);
 921 MODULE_LICENSE("GPL v2");