mac80211: unify config_interface and bss_info_changed
[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 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");