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         spin_lock_irqsave(&adapter->main_proc_lock, flags);
 274         if ((adapter->int_status) || IS_CARD_RX_RCVD(adapter)) {
 275                 spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 276                 goto process_start;
 277         }
 278
 279         adapter->mwifiex_processing = false;
 280         spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 281
 282 exit_main_proc:
 283         if (adapter->hw_status == MWIFIEX_HW_STATUS_CLOSING)
 284                 mwifiex_shutdown_drv(adapter);
 285         return ret;
 286 }
 287 EXPORT_SYMBOL_GPL(mwifiex_main_process);
 288
 289 /*
 290  * This function frees the adapter structure.
 291  *
 292  * Additionally, this closes the netlink socket, frees the timers
 293  * and private structures.
 294  */
 295 static void mwifiex_free_adapter(struct mwifiex_adapter *adapter)
 296 {
 297         if (!adapter) {
 298                 pr_err("%s: adapter is NULL\n", __func__);
 299                 return;
 300         }
 301
 302         mwifiex_unregister(adapter);
 303         pr_debug("info: %s: free adapter\n", __func__);
 304 }
 305
 306 /*
 307  * This function gets firmware and initializes it.
 308  *
 309  * The main initialization steps followed are -
 310  *      - Download the correct firmware to card
 311  *      - Issue the init commands to firmware
 312  */
 313 static void mwifiex_fw_dpc(const struct firmware *firmware, void *context)
 314 {
 315         int ret;
 316         char fmt[64];
 317         struct mwifiex_private *priv;
 318         struct mwifiex_adapter *adapter = context;
 319         struct mwifiex_fw_image fw;
 320
 321         if (!firmware) {
 322                 dev_err(adapter->dev,
 323                         "Failed to get firmware %s\n", adapter->fw_name);
 324                 goto done;
 325         }
 326
 327         memset(&fw, 0, sizeof(struct mwifiex_fw_image));
 328         adapter->firmware = firmware;
 329         fw.fw_buf = (u8 *) adapter->firmware->data;
 330         fw.fw_len = adapter->firmware->size;
 331
 332         if (adapter->if_ops.dnld_fw)
 333                 ret = adapter->if_ops.dnld_fw(adapter, &fw);
 334         else
 335                 ret = mwifiex_dnld_fw(adapter, &fw);
 336         if (ret == -1)
 337                 goto done;
 338
 339         dev_notice(adapter->dev, "WLAN FW is active\n");
 340
 341         adapter->init_wait_q_woken = false;
 342         ret = mwifiex_init_fw(adapter);
 343         if (ret == -1) {
 344                 goto done;
 345         } else if (!ret) {
 346                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 347                 goto done;
 348         }
 349         /* Wait for mwifiex_init to complete */
 350         wait_event_interruptible(adapter->init_wait_q,
 351                                  adapter->init_wait_q_woken);
 352         if (adapter->hw_status != MWIFIEX_HW_STATUS_READY)
 353                 goto done;
 354
 355         priv = adapter->priv[MWIFIEX_BSS_ROLE_STA];
 356         if (mwifiex_register_cfg80211(adapter)) {
 357                 dev_err(adapter->dev, "cannot register with cfg80211\n");
 358                 goto err_init_fw;
 359         }
 360
 361         rtnl_lock();
 362         /* Create station interface by default */
 363         if (!mwifiex_add_virtual_intf(adapter->wiphy, "mlan%d",
 364                                       NL80211_IFTYPE_STATION, NULL, NULL)) {
 365                 dev_err(adapter->dev, "cannot create default STA interface\n");
 366                 goto err_add_intf;
 367         }
 368         rtnl_unlock();
 369
 370         mwifiex_drv_get_driver_version(adapter, fmt, sizeof(fmt) - 1);
 371         dev_notice(adapter->dev, "driver_version = %s\n", fmt);
 372         goto done;
 373
 374 err_add_intf:
 375         mwifiex_del_virtual_intf(adapter->wiphy, priv->wdev);
 376         rtnl_unlock();
 377 err_init_fw:
 378         pr_debug("info: %s: unregister device\n", __func__);
 379         adapter->if_ops.unregister_dev(adapter);
 380 done:
 381         release_firmware(adapter->firmware);
 382         complete(&adapter->fw_load);
 383         return;
 384 }
 385
 386 /*
 387  * This function initializes the hardware and gets firmware.
 388  */
 389 static int mwifiex_init_hw_fw(struct mwifiex_adapter *adapter)
 390 {
 391         int ret;
 392
 393         init_completion(&adapter->fw_load);
 394         ret = request_firmware_nowait(THIS_MODULE, 1, adapter->fw_name,
 395                                       adapter->dev, GFP_KERNEL, adapter,
 396                                       mwifiex_fw_dpc);
 397         if (ret < 0)
 398                 dev_err(adapter->dev,
 399                         "request_firmware_nowait() returned error %d\n", ret);
 400         return ret;
 401 }
 402
 403 /*
 404  * CFG802.11 network device handler for open.
 405  *
 406  * Starts the data queue.
 407  */
 408 static int
 409 mwifiex_open(struct net_device *dev)
 410 {
 411         netif_tx_start_all_queues(dev);
 412         return 0;
 413 }
 414
 415 /*
 416  * CFG802.11 network device handler for close.
 417  */
 418 static int
 419 mwifiex_close(struct net_device *dev)
 420 {
 421         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 422
 423         if (priv->scan_request) {
 424                 dev_dbg(priv->adapter->dev, "aborting scan on ndo_stop\n");
 425                 cfg80211_scan_done(priv->scan_request, 1);
 426                 priv->scan_request = NULL;
 427         }
 428
 429         return 0;
 430 }
 431
 432 /*
 433  * Add buffer into wmm tx queue and queue work to transmit it.
 434  */
 435 int mwifiex_queue_tx_pkt(struct mwifiex_private *priv, struct sk_buff *skb)
 436 {
 437         struct netdev_queue *txq;
 438         int index = mwifiex_1d_to_wmm_queue[skb->priority];
 439
 440         if (atomic_inc_return(&priv->wmm_tx_pending[index]) >= MAX_TX_PENDING) {
 441                 txq = netdev_get_tx_queue(priv->netdev, index);
 442                 if (!netif_tx_queue_stopped(txq)) {
 443                         netif_tx_stop_queue(txq);
 444                         dev_dbg(priv->adapter->dev, "stop queue: %d\n", index);
 445                 }
 446         }
 447
 448         atomic_inc(&priv->adapter->tx_pending);
 449         mwifiex_wmm_add_buf_txqueue(priv, skb);
 450
 451         if (priv->adapter->scan_delay_cnt)
 452                 atomic_set(&priv->adapter->is_tx_received, true);
 453
 454         queue_work(priv->adapter->workqueue, &priv->adapter->main_work);
 455
 456         return 0;
 457 }
 458
 459 /*
 460  * CFG802.11 network device handler for data transmission.
 461  */
 462 static int
 463 mwifiex_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 464 {
 465         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 466         struct sk_buff *new_skb;
 467         struct mwifiex_txinfo *tx_info;
 468         struct timeval tv;
 469
 470         dev_dbg(priv->adapter->dev, "data: %lu BSS(%d-%d): Data <= kernel\n",
 471                 jiffies, priv->bss_type, priv->bss_num);
 472
 473         if (priv->adapter->surprise_removed) {
 474                 kfree_skb(skb);
 475                 priv->stats.tx_dropped++;
 476                 return 0;
 477         }
 478         if (!skb->len || (skb->len > ETH_FRAME_LEN)) {
 479                 dev_err(priv->adapter->dev, "Tx: bad skb len %d\n", skb->len);
 480                 kfree_skb(skb);
 481                 priv->stats.tx_dropped++;
 482                 return 0;
 483         }
 484         if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
 485                 dev_dbg(priv->adapter->dev,
 486                         "data: Tx: insufficient skb headroom %d\n",
 487                         skb_headroom(skb));
 488                 /* Insufficient skb headroom - allocate a new skb */
 489                 new_skb =
 490                         skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
 491                 if (unlikely(!new_skb)) {
 492                         dev_err(priv->adapter->dev, "Tx: cannot alloca new_skb\n");
 493                         kfree_skb(skb);
 494                         priv->stats.tx_dropped++;
 495                         return 0;
 496                 }
 497                 kfree_skb(skb);
 498                 skb = new_skb;
 499                 dev_dbg(priv->adapter->dev, "info: new skb headroomd %d\n",
 500                         skb_headroom(skb));
 501         }
 502
 503         tx_info = MWIFIEX_SKB_TXCB(skb);
 504         tx_info->bss_num = priv->bss_num;
 505         tx_info->bss_type = priv->bss_type;
 506
 507         /* Record the current time the packet was queued; used to
 508          * determine the amount of time the packet was queued in
 509          * the driver before it was sent to the firmware.
 510          * The delay is then sent along with the packet to the
 511          * firmware for aggregate delay calculation for stats and
 512          * MSDU lifetime expiry.
 513          */
 514         do_gettimeofday(&tv);
 515         skb->tstamp = timeval_to_ktime(tv);
 516
 517         mwifiex_queue_tx_pkt(priv, skb);
 518
 519         return 0;
 520 }
 521
 522 /*
 523  * CFG802.11 network device handler for setting MAC address.
 524  */
 525 static int
 526 mwifiex_set_mac_address(struct net_device *dev, void *addr)
 527 {
 528         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 529         struct sockaddr *hw_addr = addr;
 530         int ret;
 531
 532         memcpy(priv->curr_addr, hw_addr->sa_data, ETH_ALEN);
 533
 534         /* Send request to firmware */
 535         ret = mwifiex_send_cmd_sync(priv, HostCmd_CMD_802_11_MAC_ADDRESS,
 536                                     HostCmd_ACT_GEN_SET, 0, NULL);
 537
 538         if (!ret)
 539                 memcpy(priv->netdev->dev_addr, priv->curr_addr, ETH_ALEN);
 540         else
 541                 dev_err(priv->adapter->dev,
 542                         "set mac address failed: ret=%d\n", ret);
 543
 544         memcpy(dev->dev_addr, priv->curr_addr, ETH_ALEN);
 545
 546         return ret;
 547 }
 548
 549 /*
 550  * CFG802.11 network device handler for setting multicast list.
 551  */
 552 static void mwifiex_set_multicast_list(struct net_device *dev)
 553 {
 554         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 555         struct mwifiex_multicast_list mcast_list;
 556
 557         if (dev->flags & IFF_PROMISC) {
 558                 mcast_list.mode = MWIFIEX_PROMISC_MODE;
 559         } else if (dev->flags & IFF_ALLMULTI ||
 560                    netdev_mc_count(dev) > MWIFIEX_MAX_MULTICAST_LIST_SIZE) {
 561                 mcast_list.mode = MWIFIEX_ALL_MULTI_MODE;
 562         } else {
 563                 mcast_list.mode = MWIFIEX_MULTICAST_MODE;
 564                 mcast_list.num_multicast_addr =
 565                         mwifiex_copy_mcast_addr(&mcast_list, dev);
 566         }
 567         mwifiex_request_set_multicast_list(priv, &mcast_list);
 568 }
 569
 570 /*
 571  * CFG802.11 network device handler for transmission timeout.
 572  */
 573 static void
 574 mwifiex_tx_timeout(struct net_device *dev)
 575 {
 576         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 577
 578         priv->num_tx_timeout++;
 579         priv->tx_timeout_cnt++;
 580         dev_err(priv->adapter->dev,
 581                 "%lu : Tx timeout(#%d), bss_type-num = %d-%d\n",
 582                 jiffies, priv->tx_timeout_cnt, priv->bss_type, priv->bss_num);
 583         mwifiex_set_trans_start(dev);
 584
 585         if (priv->tx_timeout_cnt > TX_TIMEOUT_THRESHOLD &&
 586             priv->adapter->if_ops.card_reset) {
 587                 dev_err(priv->adapter->dev,
 588                         "tx_timeout_cnt exceeds threshold. Triggering card reset!\n");
 589                 priv->adapter->if_ops.card_reset(priv->adapter);
 590         }
 591 }
 592
 593 /*
 594  * CFG802.11 network device handler for statistics retrieval.
 595  */
 596 static struct net_device_stats *mwifiex_get_stats(struct net_device *dev)
 597 {
 598         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 599
 600         return &priv->stats;
 601 }
 602
 603 static u16
 604 mwifiex_netdev_select_wmm_queue(struct net_device *dev, struct sk_buff *skb)
 605 {
 606         skb->priority = cfg80211_classify8021d(skb);
 607         return mwifiex_1d_to_wmm_queue[skb->priority];
 608 }
 609
 610 /* Network device handlers */
 611 static const struct net_device_ops mwifiex_netdev_ops = {
 612         .ndo_open = mwifiex_open,
 613         .ndo_stop = mwifiex_close,
 614         .ndo_start_xmit = mwifiex_hard_start_xmit,
 615         .ndo_set_mac_address = mwifiex_set_mac_address,
 616         .ndo_tx_timeout = mwifiex_tx_timeout,
 617         .ndo_get_stats = mwifiex_get_stats,
 618         .ndo_set_rx_mode = mwifiex_set_multicast_list,
 619         .ndo_select_queue = mwifiex_netdev_select_wmm_queue,
 620 };
 621
 622 /*
 623  * This function initializes the private structure parameters.
 624  *
 625  * The following wait queues are initialized -
 626  *      - IOCTL wait queue
 627  *      - Command wait queue
 628  *      - Statistics wait queue
 629  *
 630  * ...and the following default parameters are set -
 631  *      - Current key index     : Set to 0
 632  *      - Rate index            : Set to auto
 633  *      - Media connected       : Set to disconnected
 634  *      - Adhoc link sensed     : Set to false
 635  *      - Nick name             : Set to null
 636  *      - Number of Tx timeout  : Set to 0
 637  *      - Device address        : Set to current address
 638  *
 639  * In addition, the CFG80211 work queue is also created.
 640  */
 641 void mwifiex_init_priv_params(struct mwifiex_private *priv,
 642                                                 struct net_device *dev)
 643 {
 644         dev->netdev_ops = &mwifiex_netdev_ops;
 645         dev->destructor = free_netdev;
 646         /* Initialize private structure */
 647         priv->current_key_index = 0;
 648         priv->media_connected = false;
 649         memset(&priv->nick_name, 0, sizeof(priv->nick_name));
 650         memset(priv->mgmt_ie, 0,
 651                sizeof(struct mwifiex_ie) * MAX_MGMT_IE_INDEX);
 652         priv->beacon_idx = MWIFIEX_AUTO_IDX_MASK;
 653         priv->proberesp_idx = MWIFIEX_AUTO_IDX_MASK;
 654         priv->assocresp_idx = MWIFIEX_AUTO_IDX_MASK;
 655         priv->rsn_idx = MWIFIEX_AUTO_IDX_MASK;
 656         priv->num_tx_timeout = 0;
 657         memcpy(dev->dev_addr, priv->curr_addr, ETH_ALEN);
 658 }
 659
 660 /*
 661  * This function check if command is pending.
 662  */
 663 int is_command_pending(struct mwifiex_adapter *adapter)
 664 {
 665         unsigned long flags;
 666         int is_cmd_pend_q_empty;
 667
 668         spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
 669         is_cmd_pend_q_empty = list_empty(&adapter->cmd_pending_q);
 670         spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);
 671
 672         return !is_cmd_pend_q_empty;
 673 }
 674
 675 /*
 676  * This is the main work queue function.
 677  *
 678  * It handles the main process, which in turn handles the complete
 679  * driver operations.
 680  */
 681 static void mwifiex_main_work_queue(struct work_struct *work)
 682 {
 683         struct mwifiex_adapter *adapter =
 684                 container_of(work, struct mwifiex_adapter, main_work);
 685
 686         if (adapter->surprise_removed)
 687                 return;
 688         mwifiex_main_process(adapter);
 689 }
 690
 691 /*
 692  * This function cancels all works in the queue and destroys
 693  * the main workqueue.
 694  */
 695 static void
 696 mwifiex_terminate_workqueue(struct mwifiex_adapter *adapter)
 697 {
 698         flush_workqueue(adapter->workqueue);
 699         destroy_workqueue(adapter->workqueue);
 700         adapter->workqueue = NULL;
 701 }
 702
 703 /*
 704  * This function adds the card.
 705  *
 706  * This function follows the following major steps to set up the device -
 707  *      - Initialize software. This includes probing the card, registering
 708  *        the interface operations table, and allocating/initializing the
 709  *        adapter structure
 710  *      - Set up the netlink socket
 711  *      - Create and start the main work queue
 712  *      - Register the device
 713  *      - Initialize firmware and hardware
 714  *      - Add logical interfaces
 715  */
 716 int
 717 mwifiex_add_card(void *card, struct semaphore *sem,
 718                  struct mwifiex_if_ops *if_ops, u8 iface_type)
 719 {
 720         struct mwifiex_adapter *adapter;
 721
 722         if (down_interruptible(sem))
 723                 goto exit_sem_err;
 724
 725         if (mwifiex_register(card, if_ops, (void **)&adapter)) {
 726                 pr_err("%s: software init failed\n", __func__);
 727                 goto err_init_sw;
 728         }
 729
 730         adapter->iface_type = iface_type;
 731
 732         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 733         adapter->surprise_removed = false;
 734         init_waitqueue_head(&adapter->init_wait_q);
 735         adapter->is_suspended = false;
 736         adapter->hs_activated = false;
 737         init_waitqueue_head(&adapter->hs_activate_wait_q);
 738         adapter->cmd_wait_q_required = false;
 739         init_waitqueue_head(&adapter->cmd_wait_q.wait);
 740         adapter->cmd_wait_q.status = 0;
 741         adapter->scan_wait_q_woken = false;
 742
 743         adapter->workqueue = create_workqueue("MWIFIEX_WORK_QUEUE");
 744         if (!adapter->workqueue)
 745                 goto err_kmalloc;
 746
 747         INIT_WORK(&adapter->main_work, mwifiex_main_work_queue);
 748
 749         /* Register the device. Fill up the private data structure with relevant
 750            information from the card and request for the required IRQ. */
 751         if (adapter->if_ops.register_dev(adapter)) {
 752                 pr_err("%s: failed to register mwifiex device\n", __func__);
 753                 goto err_registerdev;
 754         }
 755
 756         if (mwifiex_init_hw_fw(adapter)) {
 757                 pr_err("%s: firmware init failed\n", __func__);
 758                 goto err_init_fw;
 759         }
 760
 761         up(sem);
 762         return 0;
 763
 764 err_init_fw:
 765         pr_debug("info: %s: unregister device\n", __func__);
 766         if (adapter->if_ops.unregister_dev)
 767                 adapter->if_ops.unregister_dev(adapter);
 768 err_registerdev:
 769         adapter->surprise_removed = true;
 770         mwifiex_terminate_workqueue(adapter);
 771 err_kmalloc:
 772         if ((adapter->hw_status == MWIFIEX_HW_STATUS_FW_READY) ||
 773             (adapter->hw_status == MWIFIEX_HW_STATUS_READY)) {
 774                 pr_debug("info: %s: shutdown mwifiex\n", __func__);
 775                 adapter->init_wait_q_woken = false;
 776
 777                 if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 778                         wait_event_interruptible(adapter->init_wait_q,
 779                                                  adapter->init_wait_q_woken);
 780         }
 781
 782         mwifiex_free_adapter(adapter);
 783
 784 err_init_sw:
 785         up(sem);
 786
 787 exit_sem_err:
 788         return -1;
 789 }
 790 EXPORT_SYMBOL_GPL(mwifiex_add_card);
 791
 792 /*
 793  * This function removes the card.
 794  *
 795  * This function follows the following major steps to remove the device -
 796  *      - Stop data traffic
 797  *      - Shutdown firmware
 798  *      - Remove the logical interfaces
 799  *      - Terminate the work queue
 800  *      - Unregister the device
 801  *      - Free the adapter structure
 802  */
 803 int mwifiex_remove_card(struct mwifiex_adapter *adapter, struct semaphore *sem)
 804 {
 805         struct mwifiex_private *priv = NULL;
 806         int i;
 807
 808         if (down_interruptible(sem))
 809                 goto exit_sem_err;
 810
 811         if (!adapter)
 812                 goto exit_remove;
 813
 814         adapter->surprise_removed = true;
 815
 816         /* Stop data */
 817         for (i = 0; i < adapter->priv_num; i++) {
 818                 priv = adapter->priv[i];
 819                 if (priv && priv->netdev) {
 820                         mwifiex_stop_net_dev_queue(priv->netdev, adapter);
 821                         if (netif_carrier_ok(priv->netdev))
 822                                 netif_carrier_off(priv->netdev);
 823                 }
 824         }
 825
 826         dev_dbg(adapter->dev, "cmd: calling mwifiex_shutdown_drv...\n");
 827         adapter->init_wait_q_woken = false;
 828
 829         if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 830                 wait_event_interruptible(adapter->init_wait_q,
 831                                          adapter->init_wait_q_woken);
 832         dev_dbg(adapter->dev, "cmd: mwifiex_shutdown_drv done\n");
 833         if (atomic_read(&adapter->rx_pending) ||
 834             atomic_read(&adapter->tx_pending) ||
 835             atomic_read(&adapter->cmd_pending)) {
 836                 dev_err(adapter->dev, "rx_pending=%d, tx_pending=%d, "
 837                        "cmd_pending=%d\n",
 838                        atomic_read(&adapter->rx_pending),
 839                        atomic_read(&adapter->tx_pending),
 840                        atomic_read(&adapter->cmd_pending));
 841         }
 842
 843         for (i = 0; i < adapter->priv_num; i++) {
 844                 priv = adapter->priv[i];
 845
 846                 if (!priv)
 847                         continue;
 848
 849                 rtnl_lock();
 850                 if (priv->wdev && priv->netdev)
 851                         mwifiex_del_virtual_intf(adapter->wiphy, priv->wdev);
 852                 rtnl_unlock();
 853         }
 854
 855         priv = adapter->priv[0];
 856         if (!priv || !priv->wdev)
 857                 goto exit_remove;
 858
 859         wiphy_unregister(priv->wdev->wiphy);
 860         wiphy_free(priv->wdev->wiphy);
 861
 862         for (i = 0; i < adapter->priv_num; i++) {
 863                 priv = adapter->priv[i];
 864                 if (priv)
 865                         kfree(priv->wdev);
 866         }
 867
 868         mwifiex_terminate_workqueue(adapter);
 869
 870         /* Unregister device */
 871         dev_dbg(adapter->dev, "info: unregister device\n");
 872         if (adapter->if_ops.unregister_dev)
 873                 adapter->if_ops.unregister_dev(adapter);
 874         /* Free adapter structure */
 875         dev_dbg(adapter->dev, "info: free adapter\n");
 876         mwifiex_free_adapter(adapter);
 877
 878 exit_remove:
 879         up(sem);
 880 exit_sem_err:
 881         return 0;
 882 }
 883 EXPORT_SYMBOL_GPL(mwifiex_remove_card);
 884
 885 /*
 886  * This function initializes the module.
 887  *
 888  * The debug FS is also initialized if configured.
 889  */
 890 static int
 891 mwifiex_init_module(void)
 892 {
 893 #ifdef CONFIG_DEBUG_FS
 894         mwifiex_debugfs_init();
 895 #endif
 896         return 0;
 897 }
 898
 899 /*
 900  * This function cleans up the module.
 901  *
 902  * The debug FS is removed if available.
 903  */
 904 static void
 905 mwifiex_cleanup_module(void)
 906 {
 907 #ifdef CONFIG_DEBUG_FS
 908         mwifiex_debugfs_remove();
 909 #endif
 910 }
 911
 912 module_init(mwifiex_init_module);
 913 module_exit(mwifiex_cleanup_module);
 914
 915 MODULE_AUTHOR("Marvell International Ltd.");
 916 MODULE_DESCRIPTION("Marvell WiFi-Ex Driver version " VERSION);
 917 MODULE_VERSION(VERSION);
 918 MODULE_LICENSE("GPL v2");