git.oblomov.eu Git - linux-2.6/blob - drivers/net/wireless/libertas_tf/main.c

   1 /*
   2  *  Copyright (C) 2008, cozybit Inc.
   3  *  Copyright (C) 2003-2006, Marvell International Ltd.
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or (at
   8  *  your option) any later version.
   9  */
  10 #include "libertas_tf.h"
  11 #include "linux/etherdevice.h"
  12
  13 #define DRIVER_RELEASE_VERSION "004.p0"
  14 /* thinfirm version: 5.132.X.pX */
  15 #define LBTF_FW_VER_MIN         0x05840300
  16 #define LBTF_FW_VER_MAX         0x0584ffff
  17 #define QOS_CONTROL_LEN         2
  18
  19 static const char lbtf_driver_version[] = "THINFIRM-USB8388-" DRIVER_RELEASE_VERSION;
  20 struct workqueue_struct *lbtf_wq;
  21
  22 static const struct ieee80211_channel lbtf_channels[] = {
  23         { .center_freq = 2412, .hw_value = 1 },
  24         { .center_freq = 2417, .hw_value = 2 },
  25         { .center_freq = 2422, .hw_value = 3 },
  26         { .center_freq = 2427, .hw_value = 4 },
  27         { .center_freq = 2432, .hw_value = 5 },
  28         { .center_freq = 2437, .hw_value = 6 },
  29         { .center_freq = 2442, .hw_value = 7 },
  30         { .center_freq = 2447, .hw_value = 8 },
  31         { .center_freq = 2452, .hw_value = 9 },
  32         { .center_freq = 2457, .hw_value = 10 },
  33         { .center_freq = 2462, .hw_value = 11 },
  34         { .center_freq = 2467, .hw_value = 12 },
  35         { .center_freq = 2472, .hw_value = 13 },
  36         { .center_freq = 2484, .hw_value = 14 },
  37 };
  38
  39 /* This table contains the hardware specific values for the modulation rates. */
  40 static const struct ieee80211_rate lbtf_rates[] = {
  41         { .bitrate = 10,
  42           .hw_value = 0, },
  43         { .bitrate = 20,
  44           .hw_value = 1,
  45           .flags = IEEE80211_RATE_SHORT_PREAMBLE },
  46         { .bitrate = 55,
  47           .hw_value = 2,
  48           .flags = IEEE80211_RATE_SHORT_PREAMBLE },
  49         { .bitrate = 110,
  50           .hw_value = 3,
  51           .flags = IEEE80211_RATE_SHORT_PREAMBLE },
  52         { .bitrate = 60,
  53           .hw_value = 5,
  54           .flags = 0 },
  55         { .bitrate = 90,
  56           .hw_value = 6,
  57           .flags = 0 },
  58         { .bitrate = 120,
  59           .hw_value = 7,
  60           .flags = 0 },
  61         { .bitrate = 180,
  62           .hw_value = 8,
  63           .flags = 0 },
  64         { .bitrate = 240,
  65           .hw_value = 9,
  66           .flags = 0 },
  67         { .bitrate = 360,
  68           .hw_value = 10,
  69           .flags = 0 },
  70         { .bitrate = 480,
  71           .hw_value = 11,
  72           .flags = 0 },
  73         { .bitrate = 540,
  74           .hw_value = 12,
  75           .flags = 0 },
  76 };
  77
  78 static void lbtf_cmd_work(struct work_struct *work)
  79 {
  80         struct lbtf_private *priv = container_of(work, struct lbtf_private,
  81                                          cmd_work);
  82         spin_lock_irq(&priv->driver_lock);
  83         /* command response? */
  84         if (priv->cmd_response_rxed) {
  85                 priv->cmd_response_rxed = 0;
  86                 spin_unlock_irq(&priv->driver_lock);
  87                 lbtf_process_rx_command(priv);
  88                 spin_lock_irq(&priv->driver_lock);
  89         }
  90
  91         if (priv->cmd_timed_out && priv->cur_cmd) {
  92                 struct cmd_ctrl_node *cmdnode = priv->cur_cmd;
  93
  94                 if (++priv->nr_retries > 10) {
  95                         lbtf_complete_command(priv, cmdnode,
  96                                               -ETIMEDOUT);
  97                         priv->nr_retries = 0;
  98                 } else {
  99                         priv->cur_cmd = NULL;
 100
 101                         /* Stick it back at the _top_ of the pending
 102                          * queue for immediate resubmission */
 103                         list_add(&cmdnode->list, &priv->cmdpendingq);
 104                 }
 105         }
 106         priv->cmd_timed_out = 0;
 107         spin_unlock_irq(&priv->driver_lock);
 108
 109         if (!priv->fw_ready)
 110                 return;
 111         /* Execute the next command */
 112         if (!priv->cur_cmd)
 113                 lbtf_execute_next_command(priv);
 114 }
 115
 116 /**
 117  *  lbtf_setup_firmware: initialize firmware.
 118  *
 119  *  @priv    A pointer to struct lbtf_private structure
 120  *
 121  *  Returns: 0 on success.
 122  */
 123 static int lbtf_setup_firmware(struct lbtf_private *priv)
 124 {
 125         int ret = -1;
 126
 127         /*
 128          * Read priv address from HW
 129          */
 130         memset(priv->current_addr, 0xff, ETH_ALEN);
 131         ret = lbtf_update_hw_spec(priv);
 132         if (ret) {
 133                 ret = -1;
 134                 goto done;
 135         }
 136
 137         lbtf_set_mac_control(priv);
 138         lbtf_set_radio_control(priv);
 139
 140         ret = 0;
 141 done:
 142         return ret;
 143 }
 144
 145 /**
 146  *  This function handles the timeout of command sending.
 147  *  It will re-send the same command again.
 148  */
 149 static void command_timer_fn(unsigned long data)
 150 {
 151         struct lbtf_private *priv = (struct lbtf_private *)data;
 152         unsigned long flags;
 153
 154         spin_lock_irqsave(&priv->driver_lock, flags);
 155
 156         if (!priv->cur_cmd) {
 157                 printk(KERN_DEBUG "libertastf: command timer expired; "
 158                                   "no pending command\n");
 159                 goto out;
 160         }
 161
 162         printk(KERN_DEBUG "libertas: command %x timed out\n",
 163                 le16_to_cpu(priv->cur_cmd->cmdbuf->command));
 164
 165         priv->cmd_timed_out = 1;
 166         queue_work(lbtf_wq, &priv->cmd_work);
 167 out:
 168         spin_unlock_irqrestore(&priv->driver_lock, flags);
 169 }
 170
 171 static int lbtf_init_adapter(struct lbtf_private *priv)
 172 {
 173         memset(priv->current_addr, 0xff, ETH_ALEN);
 174         mutex_init(&priv->lock);
 175
 176         priv->vif = NULL;
 177         setup_timer(&priv->command_timer, command_timer_fn,
 178                 (unsigned long)priv);
 179
 180         INIT_LIST_HEAD(&priv->cmdfreeq);
 181         INIT_LIST_HEAD(&priv->cmdpendingq);
 182
 183         spin_lock_init(&priv->driver_lock);
 184
 185         /* Allocate the command buffers */
 186         if (lbtf_allocate_cmd_buffer(priv))
 187                 return -1;
 188
 189         return 0;
 190 }
 191
 192 static void lbtf_free_adapter(struct lbtf_private *priv)
 193 {
 194         lbtf_free_cmd_buffer(priv);
 195         del_timer(&priv->command_timer);
 196 }
 197
 198 static int lbtf_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
 199 {
 200         struct lbtf_private *priv = hw->priv;
 201
 202         priv->skb_to_tx = skb;
 203         queue_work(lbtf_wq, &priv->tx_work);
 204         /*
 205          * queue will be restarted when we receive transmission feedback if
 206          * there are no buffered multicast frames to send
 207          */
 208         ieee80211_stop_queues(priv->hw);
 209         return NETDEV_TX_OK;
 210 }
 211
 212 static void lbtf_tx_work(struct work_struct *work)
 213 {
 214         struct lbtf_private *priv = container_of(work, struct lbtf_private,
 215                                          tx_work);
 216         unsigned int len;
 217         struct ieee80211_tx_info *info;
 218         struct txpd *txpd;
 219         struct sk_buff *skb = NULL;
 220         int err;
 221
 222         if ((priv->vif->type == NL80211_IFTYPE_AP) &&
 223             (!skb_queue_empty(&priv->bc_ps_buf)))
 224                 skb = skb_dequeue(&priv->bc_ps_buf);
 225         else if (priv->skb_to_tx) {
 226                 skb = priv->skb_to_tx;
 227                 priv->skb_to_tx = NULL;
 228         } else
 229                 return;
 230
 231         len = skb->len;
 232         info  = IEEE80211_SKB_CB(skb);
 233         txpd = (struct txpd *)  skb_push(skb, sizeof(struct txpd));
 234
 235         if (priv->surpriseremoved) {
 236                 dev_kfree_skb_any(skb);
 237                 return;
 238         }
 239
 240         memset(txpd, 0, sizeof(struct txpd));
 241         /* Activate per-packet rate selection */
 242         txpd->tx_control |= cpu_to_le32(MRVL_PER_PACKET_RATE |
 243                              ieee80211_get_tx_rate(priv->hw, info)->hw_value);
 244
 245         /* copy destination address from 802.11 header */
 246         memcpy(txpd->tx_dest_addr_high, skb->data + sizeof(struct txpd) + 4,
 247                 ETH_ALEN);
 248         txpd->tx_packet_length = cpu_to_le16(len);
 249         txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
 250         BUG_ON(priv->tx_skb);
 251         spin_lock_irq(&priv->driver_lock);
 252         priv->tx_skb = skb;
 253         err = priv->hw_host_to_card(priv, MVMS_DAT, skb->data, skb->len);
 254         spin_unlock_irq(&priv->driver_lock);
 255         if (err) {
 256                 dev_kfree_skb_any(skb);
 257                 priv->tx_skb = NULL;
 258         }
 259 }
 260
 261 static int lbtf_op_start(struct ieee80211_hw *hw)
 262 {
 263         struct lbtf_private *priv = hw->priv;
 264         void *card = priv->card;
 265         int ret = -1;
 266
 267         if (!priv->fw_ready)
 268                 /* Upload firmware */
 269                 if (priv->hw_prog_firmware(card))
 270                         goto err_prog_firmware;
 271
 272         /* poke the firmware */
 273         priv->capability = WLAN_CAPABILITY_SHORT_PREAMBLE;
 274         priv->radioon = RADIO_ON;
 275         priv->mac_control = CMD_ACT_MAC_RX_ON | CMD_ACT_MAC_TX_ON;
 276         ret = lbtf_setup_firmware(priv);
 277         if (ret)
 278                 goto err_prog_firmware;
 279
 280         if ((priv->fwrelease < LBTF_FW_VER_MIN) ||
 281             (priv->fwrelease > LBTF_FW_VER_MAX)) {
 282                 ret = -1;
 283                 goto err_prog_firmware;
 284         }
 285
 286         printk(KERN_INFO "libertastf: Marvell WLAN 802.11 thinfirm adapter\n");
 287         return 0;
 288
 289 err_prog_firmware:
 290         priv->hw_reset_device(card);
 291         return ret;
 292 }
 293
 294 static void lbtf_op_stop(struct ieee80211_hw *hw)
 295 {
 296         struct lbtf_private *priv = hw->priv;
 297         unsigned long flags;
 298         struct sk_buff *skb;
 299
 300         struct cmd_ctrl_node *cmdnode;
 301         /* Flush pending command nodes */
 302         spin_lock_irqsave(&priv->driver_lock, flags);
 303         list_for_each_entry(cmdnode, &priv->cmdpendingq, list) {
 304                 cmdnode->result = -ENOENT;
 305                 cmdnode->cmdwaitqwoken = 1;
 306                 wake_up_interruptible(&cmdnode->cmdwait_q);
 307         }
 308
 309         spin_unlock_irqrestore(&priv->driver_lock, flags);
 310         cancel_work_sync(&priv->cmd_work);
 311         cancel_work_sync(&priv->tx_work);
 312         while ((skb = skb_dequeue(&priv->bc_ps_buf)))
 313                 dev_kfree_skb_any(skb);
 314         priv->radioon = RADIO_OFF;
 315         lbtf_set_radio_control(priv);
 316
 317         return;
 318 }
 319
 320 static int lbtf_op_add_interface(struct ieee80211_hw *hw,
 321                         struct ieee80211_if_init_conf *conf)
 322 {
 323         struct lbtf_private *priv = hw->priv;
 324         if (priv->vif != NULL)
 325                 return -EOPNOTSUPP;
 326
 327         priv->vif = conf->vif;
 328         switch (conf->type) {
 329         case NL80211_IFTYPE_MESH_POINT:
 330         case NL80211_IFTYPE_AP:
 331                 lbtf_set_mode(priv, LBTF_AP_MODE);
 332                 break;
 333         case NL80211_IFTYPE_STATION:
 334                 lbtf_set_mode(priv, LBTF_STA_MODE);
 335                 break;
 336         default:
 337                 priv->vif = NULL;
 338                 return -EOPNOTSUPP;
 339         }
 340         lbtf_set_mac_address(priv, (u8 *) conf->mac_addr);
 341         return 0;
 342 }
 343
 344 static void lbtf_op_remove_interface(struct ieee80211_hw *hw,
 345                         struct ieee80211_if_init_conf *conf)
 346 {
 347         struct lbtf_private *priv = hw->priv;
 348
 349         if (priv->vif->type == NL80211_IFTYPE_AP ||
 350             priv->vif->type == NL80211_IFTYPE_MESH_POINT)
 351                 lbtf_beacon_ctrl(priv, 0, 0);
 352         lbtf_set_mode(priv, LBTF_PASSIVE_MODE);
 353         lbtf_set_bssid(priv, 0, NULL);
 354         priv->vif = NULL;
 355 }
 356
 357 static int lbtf_op_config(struct ieee80211_hw *hw, u32 changed)
 358 {
 359         struct lbtf_private *priv = hw->priv;
 360         struct ieee80211_conf *conf = &hw->conf;
 361
 362         if (conf->channel->center_freq != priv->cur_freq) {
 363                 priv->cur_freq = conf->channel->center_freq;
 364                 lbtf_set_channel(priv, conf->channel->hw_value);
 365         }
 366         return 0;
 367 }
 368
 369 #define SUPPORTED_FIF_FLAGS  (FIF_PROMISC_IN_BSS | FIF_ALLMULTI)
 370 static void lbtf_op_configure_filter(struct ieee80211_hw *hw,
 371                         unsigned int changed_flags,
 372                         unsigned int *new_flags,
 373                         int mc_count, struct dev_mc_list *mclist)
 374 {
 375         struct lbtf_private *priv = hw->priv;
 376         int old_mac_control = priv->mac_control;
 377         int i;
 378         changed_flags &= SUPPORTED_FIF_FLAGS;
 379         *new_flags &= SUPPORTED_FIF_FLAGS;
 380
 381         if (!changed_flags)
 382                 return;
 383
 384         if (*new_flags & (FIF_PROMISC_IN_BSS))
 385                 priv->mac_control |= CMD_ACT_MAC_PROMISCUOUS_ENABLE;
 386         else
 387                 priv->mac_control &= ~CMD_ACT_MAC_PROMISCUOUS_ENABLE;
 388         if (*new_flags & (FIF_ALLMULTI) ||
 389             mc_count > MRVDRV_MAX_MULTICAST_LIST_SIZE) {
 390                 priv->mac_control |= CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
 391                 priv->mac_control &= ~CMD_ACT_MAC_MULTICAST_ENABLE;
 392         } else if (mc_count) {
 393                 priv->mac_control |= CMD_ACT_MAC_MULTICAST_ENABLE;
 394                 priv->mac_control &= ~CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
 395                 priv->nr_of_multicastmacaddr = mc_count;
 396                 for (i = 0; i < mc_count; i++) {
 397                         if (!mclist)
 398                                 break;
 399                         memcpy(&priv->multicastlist[i], mclist->da_addr,
 400                                         ETH_ALEN);
 401                         mclist = mclist->next;
 402                 }
 403                 lbtf_cmd_set_mac_multicast_addr(priv);
 404         } else {
 405                 priv->mac_control &= ~(CMD_ACT_MAC_MULTICAST_ENABLE |
 406                                        CMD_ACT_MAC_ALL_MULTICAST_ENABLE);
 407                 if (priv->nr_of_multicastmacaddr) {
 408                         priv->nr_of_multicastmacaddr = 0;
 409                         lbtf_cmd_set_mac_multicast_addr(priv);
 410                 }
 411         }
 412
 413
 414         if (priv->mac_control != old_mac_control)
 415                 lbtf_set_mac_control(priv);
 416 }
 417
 418 static void lbtf_op_bss_info_changed(struct ieee80211_hw *hw,
 419                         struct ieee80211_vif *vif,
 420                         struct ieee80211_bss_conf *bss_conf,
 421                         u32 changes)
 422 {
 423         struct lbtf_private *priv = hw->priv;
 424         struct sk_buff *beacon;
 425
 426         if (changes & (BSS_CHANGED_BEACON | BSS_CHANGED_BEACON_INT)) {
 427                 switch (priv->vif->type) {
 428                 case NL80211_IFTYPE_AP:
 429                 case NL80211_IFTYPE_MESH_POINT:
 430                         beacon = ieee80211_beacon_get(hw, vif);
 431                         if (beacon) {
 432                                 lbtf_beacon_set(priv, beacon);
 433                                 kfree_skb(beacon);
 434                                 lbtf_beacon_ctrl(priv, 1,
 435                                                  bss_conf->beacon_int);
 436                         }
 437                         break;
 438                 default:
 439                         break;
 440                 }
 441         }
 442
 443         if (changes & BSS_CHANGED_BSSID) {
 444                 bool activate = !is_zero_ether_addr(bss_conf->bssid);
 445                 lbtf_set_bssid(priv, activate, bss_conf->bssid);
 446         }
 447
 448         if (changes & BSS_CHANGED_ERP_PREAMBLE) {
 449                 if (bss_conf->use_short_preamble)
 450                         priv->preamble = CMD_TYPE_SHORT_PREAMBLE;
 451                 else
 452                         priv->preamble = CMD_TYPE_LONG_PREAMBLE;
 453                 lbtf_set_radio_control(priv);
 454         }
 455 }
 456
 457 static const struct ieee80211_ops lbtf_ops = {
 458         .tx                     = lbtf_op_tx,
 459         .start                  = lbtf_op_start,
 460         .stop                   = lbtf_op_stop,
 461         .add_interface          = lbtf_op_add_interface,
 462         .remove_interface       = lbtf_op_remove_interface,
 463         .config                 = lbtf_op_config,
 464         .configure_filter       = lbtf_op_configure_filter,
 465         .bss_info_changed       = lbtf_op_bss_info_changed,
 466 };
 467
 468 int lbtf_rx(struct lbtf_private *priv, struct sk_buff *skb)
 469 {
 470         struct ieee80211_rx_status stats;
 471         struct rxpd *prxpd;
 472         int need_padding;
 473         unsigned int flags;
 474         struct ieee80211_hdr *hdr;
 475
 476         prxpd = (struct rxpd *) skb->data;
 477
 478         stats.flag = 0;
 479         if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK)))
 480                 stats.flag |= RX_FLAG_FAILED_FCS_CRC;
 481         stats.freq = priv->cur_freq;
 482         stats.band = IEEE80211_BAND_2GHZ;
 483         stats.signal = prxpd->snr;
 484         stats.noise = prxpd->nf;
 485         stats.qual = prxpd->snr - prxpd->nf;
 486         /* Marvell rate index has a hole at value 4 */
 487         if (prxpd->rx_rate > 4)
 488                 --prxpd->rx_rate;
 489         stats.rate_idx = prxpd->rx_rate;
 490         skb_pull(skb, sizeof(struct rxpd));
 491
 492         hdr = (struct ieee80211_hdr *)skb->data;
 493         flags = le32_to_cpu(*(__le32 *)(skb->data + 4));
 494
 495         need_padding = ieee80211_is_data_qos(hdr->frame_control);
 496         need_padding ^= ieee80211_has_a4(hdr->frame_control);
 497         need_padding ^= ieee80211_is_data_qos(hdr->frame_control) &&
 498                         (*ieee80211_get_qos_ctl(hdr) &
 499                          IEEE80211_QOS_CONTROL_A_MSDU_PRESENT);
 500
 501         if (need_padding) {
 502                 memmove(skb->data + 2, skb->data, skb->len);
 503                 skb_reserve(skb, 2);
 504         }
 505
 506         ieee80211_rx_irqsafe(priv->hw, skb, &stats);
 507         return 0;
 508 }
 509 EXPORT_SYMBOL_GPL(lbtf_rx);
 510
 511 /**
 512  * lbtf_add_card: Add and initialize the card, no fw upload yet.
 513  *
 514  *  @card    A pointer to card
 515  *
 516  *  Returns: pointer to struct lbtf_priv.
 517  */
 518 struct lbtf_private *lbtf_add_card(void *card, struct device *dmdev)
 519 {
 520         struct ieee80211_hw *hw;
 521         struct lbtf_private *priv = NULL;
 522
 523         hw = ieee80211_alloc_hw(sizeof(struct lbtf_private), &lbtf_ops);
 524         if (!hw)
 525                 goto done;
 526
 527         priv = hw->priv;
 528         if (lbtf_init_adapter(priv))
 529                 goto err_init_adapter;
 530
 531         priv->hw = hw;
 532         priv->card = card;
 533         priv->tx_skb = NULL;
 534
 535         hw->queues = 1;
 536         hw->flags = IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING;
 537         hw->extra_tx_headroom = sizeof(struct txpd);
 538         memcpy(priv->channels, lbtf_channels, sizeof(lbtf_channels));
 539         memcpy(priv->rates, lbtf_rates, sizeof(lbtf_rates));
 540         priv->band.n_bitrates = ARRAY_SIZE(lbtf_rates);
 541         priv->band.bitrates = priv->rates;
 542         priv->band.n_channels = ARRAY_SIZE(lbtf_channels);
 543         priv->band.channels = priv->channels;
 544         hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &priv->band;
 545         skb_queue_head_init(&priv->bc_ps_buf);
 546
 547         SET_IEEE80211_DEV(hw, dmdev);
 548
 549         INIT_WORK(&priv->cmd_work, lbtf_cmd_work);
 550         INIT_WORK(&priv->tx_work, lbtf_tx_work);
 551         if (ieee80211_register_hw(hw))
 552                 goto err_init_adapter;
 553
 554         goto done;
 555
 556 err_init_adapter:
 557         lbtf_free_adapter(priv);
 558         ieee80211_free_hw(hw);
 559         priv = NULL;
 560
 561 done:
 562         return priv;
 563 }
 564 EXPORT_SYMBOL_GPL(lbtf_add_card);
 565
 566
 567 int lbtf_remove_card(struct lbtf_private *priv)
 568 {
 569         struct ieee80211_hw *hw = priv->hw;
 570
 571         priv->surpriseremoved = 1;
 572         del_timer(&priv->command_timer);
 573         lbtf_free_adapter(priv);
 574         priv->hw = NULL;
 575         ieee80211_unregister_hw(hw);
 576         ieee80211_free_hw(hw);
 577
 578         return 0;
 579 }
 580 EXPORT_SYMBOL_GPL(lbtf_remove_card);
 581
 582 void lbtf_send_tx_feedback(struct lbtf_private *priv, u8 retrycnt, u8 fail)
 583 {
 584         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(priv->tx_skb);
 585
 586         ieee80211_tx_info_clear_status(info);
 587         /*
 588          * Commented out, otherwise we never go beyond 1Mbit/s using mac80211
 589          * default pid rc algorithm.
 590          *
 591          * info->status.retry_count = MRVL_DEFAULT_RETRIES - retrycnt;
 592          */
 593         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) && !fail)
 594                 info->flags |= IEEE80211_TX_STAT_ACK;
 595         skb_pull(priv->tx_skb, sizeof(struct txpd));
 596         ieee80211_tx_status_irqsafe(priv->hw, priv->tx_skb);
 597         priv->tx_skb = NULL;
 598         if (!priv->skb_to_tx && skb_queue_empty(&priv->bc_ps_buf))
 599                 ieee80211_wake_queues(priv->hw);
 600         else
 601                 queue_work(lbtf_wq, &priv->tx_work);
 602 }
 603 EXPORT_SYMBOL_GPL(lbtf_send_tx_feedback);
 604
 605 void lbtf_bcn_sent(struct lbtf_private *priv)
 606 {
 607         struct sk_buff *skb = NULL;
 608
 609         if (priv->vif->type != NL80211_IFTYPE_AP)
 610                 return;
 611
 612         if (skb_queue_empty(&priv->bc_ps_buf)) {
 613                 bool tx_buff_bc = 0;
 614
 615                 while ((skb = ieee80211_get_buffered_bc(priv->hw, priv->vif))) {
 616                         skb_queue_tail(&priv->bc_ps_buf, skb);
 617                         tx_buff_bc = 1;
 618                 }
 619                 if (tx_buff_bc) {
 620                         ieee80211_stop_queues(priv->hw);
 621                         queue_work(lbtf_wq, &priv->tx_work);
 622                 }
 623         }
 624
 625         skb = ieee80211_beacon_get(priv->hw, priv->vif);
 626
 627         if (skb) {
 628                 lbtf_beacon_set(priv, skb);
 629                 kfree_skb(skb);
 630         }
 631 }
 632 EXPORT_SYMBOL_GPL(lbtf_bcn_sent);
 633
 634 static int __init lbtf_init_module(void)
 635 {
 636         lbtf_wq = create_workqueue("libertastf");
 637         if (lbtf_wq == NULL) {
 638                 printk(KERN_ERR "libertastf: couldn't create workqueue\n");
 639                 return -ENOMEM;
 640         }
 641         return 0;
 642 }
 643
 644 static void __exit lbtf_exit_module(void)
 645 {
 646         destroy_workqueue(lbtf_wq);
 647 }
 648
 649 module_init(lbtf_init_module);
 650 module_exit(lbtf_exit_module);
 651
 652 MODULE_DESCRIPTION("Libertas WLAN Thinfirm Driver Library");
 653 MODULE_AUTHOR("Cozybit Inc.");
 654 MODULE_LICENSE("GPL");