mac80211/drivers: rewrite the rate control API
[linux-2.6.git] / 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 0;
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 static int lbtf_op_config_interface(struct ieee80211_hw *hw,
370                         struct ieee80211_vif *vif,
371                         struct ieee80211_if_conf *conf)
372 {
373         struct lbtf_private *priv = hw->priv;
374         struct sk_buff *beacon;
375
376         switch (priv->vif->type) {
377         case NL80211_IFTYPE_AP:
378         case NL80211_IFTYPE_MESH_POINT:
379                 beacon = ieee80211_beacon_get(hw, vif);
380                 if (beacon) {
381                         lbtf_beacon_set(priv, beacon);
382                         kfree_skb(beacon);
383                         lbtf_beacon_ctrl(priv, 1, hw->conf.beacon_int);
384                 }
385                 break;
386         default:
387                 break;
388         }
389
390         if (conf->bssid) {
391                 u8 null_bssid[ETH_ALEN] = {0};
392                 bool activate = compare_ether_addr(conf->bssid, null_bssid);
393                 lbtf_set_bssid(priv, activate, conf->bssid);
394         }
395
396         return 0;
397 }
398
399 #define SUPPORTED_FIF_FLAGS  (FIF_PROMISC_IN_BSS | FIF_ALLMULTI)
400 static void lbtf_op_configure_filter(struct ieee80211_hw *hw,
401                         unsigned int changed_flags,
402                         unsigned int *new_flags,
403                         int mc_count, struct dev_mc_list *mclist)
404 {
405         struct lbtf_private *priv = hw->priv;
406         int old_mac_control = priv->mac_control;
407         int i;
408         changed_flags &= SUPPORTED_FIF_FLAGS;
409         *new_flags &= SUPPORTED_FIF_FLAGS;
410
411         if (!changed_flags)
412                 return;
413
414         if (*new_flags & (FIF_PROMISC_IN_BSS))
415                 priv->mac_control |= CMD_ACT_MAC_PROMISCUOUS_ENABLE;
416         else
417                 priv->mac_control &= ~CMD_ACT_MAC_PROMISCUOUS_ENABLE;
418         if (*new_flags & (FIF_ALLMULTI) ||
419             mc_count > MRVDRV_MAX_MULTICAST_LIST_SIZE) {
420                 priv->mac_control |= CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
421                 priv->mac_control &= ~CMD_ACT_MAC_MULTICAST_ENABLE;
422         } else if (mc_count) {
423                 priv->mac_control |= CMD_ACT_MAC_MULTICAST_ENABLE;
424                 priv->mac_control &= ~CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
425                 priv->nr_of_multicastmacaddr = mc_count;
426                 for (i = 0; i < mc_count; i++) {
427                         if (!mclist)
428                                 break;
429                         memcpy(&priv->multicastlist[i], mclist->da_addr,
430                                         ETH_ALEN);
431                         mclist = mclist->next;
432                 }
433                 lbtf_cmd_set_mac_multicast_addr(priv);
434         } else {
435                 priv->mac_control &= ~(CMD_ACT_MAC_MULTICAST_ENABLE |
436                                        CMD_ACT_MAC_ALL_MULTICAST_ENABLE);
437                 if (priv->nr_of_multicastmacaddr) {
438                         priv->nr_of_multicastmacaddr = 0;
439                         lbtf_cmd_set_mac_multicast_addr(priv);
440                 }
441         }
442
443
444         if (priv->mac_control != old_mac_control)
445                 lbtf_set_mac_control(priv);
446 }
447
448 static void lbtf_op_bss_info_changed(struct ieee80211_hw *hw,
449                         struct ieee80211_vif *vif,
450                         struct ieee80211_bss_conf *bss_conf,
451                         u32 changes)
452 {
453         struct lbtf_private *priv = hw->priv;
454
455         if (changes & BSS_CHANGED_ERP_PREAMBLE) {
456                 if (bss_conf->use_short_preamble)
457                         priv->preamble = CMD_TYPE_SHORT_PREAMBLE;
458                 else
459                         priv->preamble = CMD_TYPE_LONG_PREAMBLE;
460                 lbtf_set_radio_control(priv);
461         }
462
463         return;
464 }
465
466 static const struct ieee80211_ops lbtf_ops = {
467         .tx                     = lbtf_op_tx,
468         .start                  = lbtf_op_start,
469         .stop                   = lbtf_op_stop,
470         .add_interface          = lbtf_op_add_interface,
471         .remove_interface       = lbtf_op_remove_interface,
472         .config                 = lbtf_op_config,
473         .config_interface       = lbtf_op_config_interface,
474         .configure_filter       = lbtf_op_configure_filter,
475         .bss_info_changed       = lbtf_op_bss_info_changed,
476 };
477
478 int lbtf_rx(struct lbtf_private *priv, struct sk_buff *skb)
479 {
480         struct ieee80211_rx_status stats;
481         struct rxpd *prxpd;
482         int need_padding;
483         unsigned int flags;
484         struct ieee80211_hdr *hdr;
485
486         prxpd = (struct rxpd *) skb->data;
487
488         stats.flag = 0;
489         if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK)))
490                 stats.flag |= RX_FLAG_FAILED_FCS_CRC;
491         stats.freq = priv->cur_freq;
492         stats.band = IEEE80211_BAND_2GHZ;
493         stats.signal = prxpd->snr;
494         stats.noise = prxpd->nf;
495         stats.qual = prxpd->snr - prxpd->nf;
496         /* Marvell rate index has a hole at value 4 */
497         if (prxpd->rx_rate > 4)
498                 --prxpd->rx_rate;
499         stats.rate_idx = prxpd->rx_rate;
500         skb_pull(skb, sizeof(struct rxpd));
501
502         hdr = (struct ieee80211_hdr *)skb->data;
503         flags = le32_to_cpu(*(__le32 *)(skb->data + 4));
504
505         need_padding = ieee80211_is_data_qos(hdr->frame_control);
506         need_padding ^= ieee80211_has_a4(hdr->frame_control);
507         need_padding ^= ieee80211_is_data_qos(hdr->frame_control) &&
508                         (*ieee80211_get_qos_ctl(hdr) &
509                          IEEE80211_QOS_CONTROL_A_MSDU_PRESENT);
510
511         if (need_padding) {
512                 memmove(skb->data + 2, skb->data, skb->len);
513                 skb_reserve(skb, 2);
514         }
515
516         ieee80211_rx_irqsafe(priv->hw, skb, &stats);
517         return 0;
518 }
519 EXPORT_SYMBOL_GPL(lbtf_rx);
520
521 /**
522  * lbtf_add_card: Add and initialize the card, no fw upload yet.
523  *
524  *  @card    A pointer to card
525  *
526  *  Returns: pointer to struct lbtf_priv.
527  */
528 struct lbtf_private *lbtf_add_card(void *card, struct device *dmdev)
529 {
530         struct ieee80211_hw *hw;
531         struct lbtf_private *priv = NULL;
532
533         hw = ieee80211_alloc_hw(sizeof(struct lbtf_private), &lbtf_ops);
534         if (!hw)
535                 goto done;
536
537         priv = hw->priv;
538         if (lbtf_init_adapter(priv))
539                 goto err_init_adapter;
540
541         priv->hw = hw;
542         priv->card = card;
543         priv->tx_skb = NULL;
544
545         hw->queues = 1;
546         hw->flags = IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING;
547         hw->extra_tx_headroom = sizeof(struct txpd);
548         memcpy(priv->channels, lbtf_channels, sizeof(lbtf_channels));
549         memcpy(priv->rates, lbtf_rates, sizeof(lbtf_rates));
550         priv->band.n_bitrates = ARRAY_SIZE(lbtf_rates);
551         priv->band.bitrates = priv->rates;
552         priv->band.n_channels = ARRAY_SIZE(lbtf_channels);
553         priv->band.channels = priv->channels;
554         hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &priv->band;
555         skb_queue_head_init(&priv->bc_ps_buf);
556
557         SET_IEEE80211_DEV(hw, dmdev);
558
559         INIT_WORK(&priv->cmd_work, lbtf_cmd_work);
560         INIT_WORK(&priv->tx_work, lbtf_tx_work);
561         if (ieee80211_register_hw(hw))
562                 goto err_init_adapter;
563
564         goto done;
565
566 err_init_adapter:
567         lbtf_free_adapter(priv);
568         ieee80211_free_hw(hw);
569         priv = NULL;
570
571 done:
572         return priv;
573 }
574 EXPORT_SYMBOL_GPL(lbtf_add_card);
575
576
577 int lbtf_remove_card(struct lbtf_private *priv)
578 {
579         struct ieee80211_hw *hw = priv->hw;
580
581         priv->surpriseremoved = 1;
582         del_timer(&priv->command_timer);
583         lbtf_free_adapter(priv);
584         priv->hw = NULL;
585         ieee80211_unregister_hw(hw);
586         ieee80211_free_hw(hw);
587
588         return 0;
589 }
590 EXPORT_SYMBOL_GPL(lbtf_remove_card);
591
592 void lbtf_send_tx_feedback(struct lbtf_private *priv, u8 retrycnt, u8 fail)
593 {
594         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(priv->tx_skb);
595
596         ieee80211_tx_info_clear_status(info);
597         /*
598          * Commented out, otherwise we never go beyond 1Mbit/s using mac80211
599          * default pid rc algorithm.
600          *
601          * info->status.retry_count = MRVL_DEFAULT_RETRIES - retrycnt;
602          */
603         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) && !fail)
604                 info->flags |= IEEE80211_TX_STAT_ACK;
605         skb_pull(priv->tx_skb, sizeof(struct txpd));
606         ieee80211_tx_status_irqsafe(priv->hw, priv->tx_skb);
607         priv->tx_skb = NULL;
608         if (!priv->skb_to_tx && skb_queue_empty(&priv->bc_ps_buf))
609                 ieee80211_wake_queues(priv->hw);
610         else
611                 queue_work(lbtf_wq, &priv->tx_work);
612 }
613 EXPORT_SYMBOL_GPL(lbtf_send_tx_feedback);
614
615 void lbtf_bcn_sent(struct lbtf_private *priv)
616 {
617         struct sk_buff *skb = NULL;
618
619         if (priv->vif->type != NL80211_IFTYPE_AP)
620                 return;
621
622         if (skb_queue_empty(&priv->bc_ps_buf)) {
623                 bool tx_buff_bc = 0;
624
625                 while ((skb = ieee80211_get_buffered_bc(priv->hw, priv->vif))) {
626                         skb_queue_tail(&priv->bc_ps_buf, skb);
627                         tx_buff_bc = 1;
628                 }
629                 if (tx_buff_bc) {
630                         ieee80211_stop_queues(priv->hw);
631                         queue_work(lbtf_wq, &priv->tx_work);
632                 }
633         }
634
635         skb = ieee80211_beacon_get(priv->hw, priv->vif);
636
637         if (skb) {
638                 lbtf_beacon_set(priv, skb);
639                 kfree_skb(skb);
640         }
641 }
642 EXPORT_SYMBOL_GPL(lbtf_bcn_sent);
643
644 static int __init lbtf_init_module(void)
645 {
646         lbtf_wq = create_workqueue("libertastf");
647         if (lbtf_wq == NULL) {
648                 printk(KERN_ERR "libertastf: couldn't create workqueue\n");
649                 return -ENOMEM;
650         }
651         return 0;
652 }
653
654 static void __exit lbtf_exit_module(void)
655 {
656         destroy_workqueue(lbtf_wq);
657 }
658
659 module_init(lbtf_init_module);
660 module_exit(lbtf_exit_module);
661
662 MODULE_DESCRIPTION("Libertas WLAN Thinfirm Driver Library");
663 MODULE_AUTHOR("Cozybit Inc.");
664 MODULE_LICENSE("GPL");