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