Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[linux-2.6.git] / drivers / net / wireless / p54 / main.c
1 /*
2  * mac80211 glue code for mac80211 Prism54 drivers
3  *
4  * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
5  * Copyright (c) 2007-2009, Christian Lamparter <chunkeey@web.de>
6  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
7  *
8  * Based on:
9  * - the islsm (softmac prism54) driver, which is:
10  *   Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
11  * - stlc45xx driver
12  *   Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License version 2 as
16  * published by the Free Software Foundation.
17  */
18
19 #include <linux/init.h>
20 #include <linux/slab.h>
21 #include <linux/firmware.h>
22 #include <linux/etherdevice.h>
23
24 #include <net/mac80211.h>
25
26 #include "p54.h"
27 #include "lmac.h"
28
29 static int modparam_nohwcrypt;
30 module_param_named(nohwcrypt, modparam_nohwcrypt, bool, S_IRUGO);
31 MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");
32 MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
33 MODULE_DESCRIPTION("Softmac Prism54 common code");
34 MODULE_LICENSE("GPL");
35 MODULE_ALIAS("prism54common");
36
37 static int p54_sta_add_remove(struct ieee80211_hw *hw,
38                               struct ieee80211_vif *vif,
39                               struct ieee80211_sta *sta)
40 {
41         struct p54_common *priv = hw->priv;
42
43         /*
44          * Notify the firmware that we don't want or we don't
45          * need to buffer frames for this station anymore.
46          */
47
48         p54_sta_unlock(priv, sta->addr);
49
50         return 0;
51 }
52
53 static void p54_sta_notify(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
54                               enum sta_notify_cmd notify_cmd,
55                               struct ieee80211_sta *sta)
56 {
57         struct p54_common *priv = dev->priv;
58
59         switch (notify_cmd) {
60         case STA_NOTIFY_AWAKE:
61                 /* update the firmware's filter table */
62                 p54_sta_unlock(priv, sta->addr);
63                 break;
64         default:
65                 break;
66         }
67 }
68
69 static int p54_set_tim(struct ieee80211_hw *dev, struct ieee80211_sta *sta,
70                         bool set)
71 {
72         struct p54_common *priv = dev->priv;
73
74         return p54_update_beacon_tim(priv, sta->aid, set);
75 }
76
77 u8 *p54_find_ie(struct sk_buff *skb, u8 ie)
78 {
79         struct ieee80211_mgmt *mgmt = (void *)skb->data;
80         u8 *pos, *end;
81
82         if (skb->len <= sizeof(mgmt))
83                 return NULL;
84
85         pos = (u8 *)mgmt->u.beacon.variable;
86         end = skb->data + skb->len;
87         while (pos < end) {
88                 if (pos + 2 + pos[1] > end)
89                         return NULL;
90
91                 if (pos[0] == ie)
92                         return pos;
93
94                 pos += 2 + pos[1];
95         }
96         return NULL;
97 }
98
99 static int p54_beacon_format_ie_tim(struct sk_buff *skb)
100 {
101         /*
102          * the good excuse for this mess is ... the firmware.
103          * The dummy TIM MUST be at the end of the beacon frame,
104          * because it'll be overwritten!
105          */
106         u8 *tim;
107         u8 dtim_len;
108         u8 dtim_period;
109         u8 *next;
110
111         tim = p54_find_ie(skb, WLAN_EID_TIM);
112         if (!tim)
113                 return 0;
114
115         dtim_len = tim[1];
116         dtim_period = tim[3];
117         next = tim + 2 + dtim_len;
118
119         if (dtim_len < 3)
120                 return -EINVAL;
121
122         memmove(tim, next, skb_tail_pointer(skb) - next);
123         tim = skb_tail_pointer(skb) - (dtim_len + 2);
124
125         /* add the dummy at the end */
126         tim[0] = WLAN_EID_TIM;
127         tim[1] = 3;
128         tim[2] = 0;
129         tim[3] = dtim_period;
130         tim[4] = 0;
131
132         if (dtim_len > 3)
133                 skb_trim(skb, skb->len - (dtim_len - 3));
134
135         return 0;
136 }
137
138 static int p54_beacon_update(struct p54_common *priv,
139                         struct ieee80211_vif *vif)
140 {
141         struct sk_buff *beacon;
142         int ret;
143
144         beacon = ieee80211_beacon_get(priv->hw, vif);
145         if (!beacon)
146                 return -ENOMEM;
147         ret = p54_beacon_format_ie_tim(beacon);
148         if (ret)
149                 return ret;
150
151         /*
152          * During operation, the firmware takes care of beaconing.
153          * The driver only needs to upload a new beacon template, once
154          * the template was changed by the stack or userspace.
155          *
156          * LMAC API 3.2.2 also specifies that the driver does not need
157          * to cancel the old beacon template by hand, instead the firmware
158          * will release the previous one through the feedback mechanism.
159          */
160         p54_tx_80211(priv->hw, beacon);
161         priv->tsf_high32 = 0;
162         priv->tsf_low32 = 0;
163
164         return 0;
165 }
166
167 static int p54_start(struct ieee80211_hw *dev)
168 {
169         struct p54_common *priv = dev->priv;
170         int err;
171
172         mutex_lock(&priv->conf_mutex);
173         err = priv->open(dev);
174         if (err)
175                 goto out;
176         P54_SET_QUEUE(priv->qos_params[0], 0x0002, 0x0003, 0x0007, 47);
177         P54_SET_QUEUE(priv->qos_params[1], 0x0002, 0x0007, 0x000f, 94);
178         P54_SET_QUEUE(priv->qos_params[2], 0x0003, 0x000f, 0x03ff, 0);
179         P54_SET_QUEUE(priv->qos_params[3], 0x0007, 0x000f, 0x03ff, 0);
180         err = p54_set_edcf(priv);
181         if (err)
182                 goto out;
183
184         memset(priv->bssid, ~0, ETH_ALEN);
185         priv->mode = NL80211_IFTYPE_MONITOR;
186         err = p54_setup_mac(priv);
187         if (err) {
188                 priv->mode = NL80211_IFTYPE_UNSPECIFIED;
189                 goto out;
190         }
191
192         ieee80211_queue_delayed_work(dev, &priv->work, 0);
193
194         priv->softled_state = 0;
195         err = p54_set_leds(priv);
196
197 out:
198         mutex_unlock(&priv->conf_mutex);
199         return err;
200 }
201
202 static void p54_stop(struct ieee80211_hw *dev)
203 {
204         struct p54_common *priv = dev->priv;
205         int i;
206
207         mutex_lock(&priv->conf_mutex);
208         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
209         priv->softled_state = 0;
210         p54_set_leds(priv);
211
212         cancel_delayed_work_sync(&priv->work);
213
214         priv->stop(dev);
215         skb_queue_purge(&priv->tx_pending);
216         skb_queue_purge(&priv->tx_queue);
217         for (i = 0; i < P54_QUEUE_NUM; i++) {
218                 priv->tx_stats[i].count = 0;
219                 priv->tx_stats[i].len = 0;
220         }
221
222         priv->beacon_req_id = cpu_to_le32(0);
223         priv->tsf_high32 = priv->tsf_low32 = 0;
224         mutex_unlock(&priv->conf_mutex);
225 }
226
227 static int p54_add_interface(struct ieee80211_hw *dev,
228                              struct ieee80211_vif *vif)
229 {
230         struct p54_common *priv = dev->priv;
231
232         mutex_lock(&priv->conf_mutex);
233         if (priv->mode != NL80211_IFTYPE_MONITOR) {
234                 mutex_unlock(&priv->conf_mutex);
235                 return -EOPNOTSUPP;
236         }
237
238         priv->vif = vif;
239
240         switch (vif->type) {
241         case NL80211_IFTYPE_STATION:
242         case NL80211_IFTYPE_ADHOC:
243         case NL80211_IFTYPE_AP:
244         case NL80211_IFTYPE_MESH_POINT:
245                 priv->mode = vif->type;
246                 break;
247         default:
248                 mutex_unlock(&priv->conf_mutex);
249                 return -EOPNOTSUPP;
250         }
251
252         memcpy(priv->mac_addr, vif->addr, ETH_ALEN);
253         p54_setup_mac(priv);
254         mutex_unlock(&priv->conf_mutex);
255         return 0;
256 }
257
258 static void p54_remove_interface(struct ieee80211_hw *dev,
259                                  struct ieee80211_vif *vif)
260 {
261         struct p54_common *priv = dev->priv;
262
263         mutex_lock(&priv->conf_mutex);
264         priv->vif = NULL;
265
266         /*
267          * LMAC API 3.2.2 states that any active beacon template must be
268          * canceled by the driver before attempting a mode transition.
269          */
270         if (le32_to_cpu(priv->beacon_req_id) != 0) {
271                 p54_tx_cancel(priv, priv->beacon_req_id);
272                 wait_for_completion_interruptible_timeout(&priv->beacon_comp, HZ);
273         }
274         priv->mode = NL80211_IFTYPE_MONITOR;
275         memset(priv->mac_addr, 0, ETH_ALEN);
276         memset(priv->bssid, 0, ETH_ALEN);
277         p54_setup_mac(priv);
278         mutex_unlock(&priv->conf_mutex);
279 }
280
281 static int p54_config(struct ieee80211_hw *dev, u32 changed)
282 {
283         int ret = 0;
284         struct p54_common *priv = dev->priv;
285         struct ieee80211_conf *conf = &dev->conf;
286
287         mutex_lock(&priv->conf_mutex);
288         if (changed & IEEE80211_CONF_CHANGE_POWER)
289                 priv->output_power = conf->power_level << 2;
290         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
291                 ret = p54_scan(priv, P54_SCAN_EXIT, 0);
292                 if (ret)
293                         goto out;
294         }
295         if (changed & IEEE80211_CONF_CHANGE_PS) {
296                 ret = p54_set_ps(priv);
297                 if (ret)
298                         goto out;
299         }
300         if (changed & IEEE80211_CONF_CHANGE_IDLE) {
301                 ret = p54_setup_mac(priv);
302                 if (ret)
303                         goto out;
304         }
305
306 out:
307         mutex_unlock(&priv->conf_mutex);
308         return ret;
309 }
310
311 static u64 p54_prepare_multicast(struct ieee80211_hw *dev,
312                                  struct netdev_hw_addr_list *mc_list)
313 {
314         struct p54_common *priv = dev->priv;
315         struct netdev_hw_addr *ha;
316         int i;
317
318         BUILD_BUG_ON(ARRAY_SIZE(priv->mc_maclist) !=
319                 ARRAY_SIZE(((struct p54_group_address_table *)NULL)->mac_list));
320         /*
321          * The first entry is reserved for the global broadcast MAC.
322          * Otherwise the firmware will drop it and ARP will no longer work.
323          */
324         i = 1;
325         priv->mc_maclist_num = netdev_hw_addr_list_count(mc_list) + i;
326         netdev_hw_addr_list_for_each(ha, mc_list) {
327                 memcpy(&priv->mc_maclist[i], ha->addr, ETH_ALEN);
328                 i++;
329                 if (i >= ARRAY_SIZE(priv->mc_maclist))
330                         break;
331         }
332
333         return 1; /* update */
334 }
335
336 static void p54_configure_filter(struct ieee80211_hw *dev,
337                                  unsigned int changed_flags,
338                                  unsigned int *total_flags,
339                                  u64 multicast)
340 {
341         struct p54_common *priv = dev->priv;
342
343         *total_flags &= FIF_PROMISC_IN_BSS |
344                         FIF_ALLMULTI |
345                         FIF_OTHER_BSS;
346
347         priv->filter_flags = *total_flags;
348
349         if (changed_flags & (FIF_PROMISC_IN_BSS | FIF_OTHER_BSS))
350                 p54_setup_mac(priv);
351
352         if (changed_flags & FIF_ALLMULTI || multicast)
353                 p54_set_groupfilter(priv);
354 }
355
356 static int p54_conf_tx(struct ieee80211_hw *dev, u16 queue,
357                        const struct ieee80211_tx_queue_params *params)
358 {
359         struct p54_common *priv = dev->priv;
360         int ret;
361
362         mutex_lock(&priv->conf_mutex);
363         if (queue < dev->queues) {
364                 P54_SET_QUEUE(priv->qos_params[queue], params->aifs,
365                         params->cw_min, params->cw_max, params->txop);
366                 ret = p54_set_edcf(priv);
367         } else
368                 ret = -EINVAL;
369         mutex_unlock(&priv->conf_mutex);
370         return ret;
371 }
372
373 static void p54_work(struct work_struct *work)
374 {
375         struct p54_common *priv = container_of(work, struct p54_common,
376                                                work.work);
377
378         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
379                 return ;
380
381         /*
382          * TODO: walk through tx_queue and do the following tasks
383          *      1. initiate bursts.
384          *      2. cancel stuck frames / reset the device if necessary.
385          */
386
387         p54_fetch_statistics(priv);
388 }
389
390 static int p54_get_stats(struct ieee80211_hw *dev,
391                          struct ieee80211_low_level_stats *stats)
392 {
393         struct p54_common *priv = dev->priv;
394
395         memcpy(stats, &priv->stats, sizeof(*stats));
396         return 0;
397 }
398
399 static void p54_bss_info_changed(struct ieee80211_hw *dev,
400                                  struct ieee80211_vif *vif,
401                                  struct ieee80211_bss_conf *info,
402                                  u32 changed)
403 {
404         struct p54_common *priv = dev->priv;
405
406         mutex_lock(&priv->conf_mutex);
407         if (changed & BSS_CHANGED_BSSID) {
408                 memcpy(priv->bssid, info->bssid, ETH_ALEN);
409                 p54_setup_mac(priv);
410         }
411
412         if (changed & BSS_CHANGED_BEACON) {
413                 p54_scan(priv, P54_SCAN_EXIT, 0);
414                 p54_setup_mac(priv);
415                 p54_beacon_update(priv, vif);
416                 p54_set_edcf(priv);
417         }
418
419         if (changed & (BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BEACON)) {
420                 priv->use_short_slot = info->use_short_slot;
421                 p54_set_edcf(priv);
422         }
423         if (changed & BSS_CHANGED_BASIC_RATES) {
424                 if (dev->conf.channel->band == IEEE80211_BAND_5GHZ)
425                         priv->basic_rate_mask = (info->basic_rates << 4);
426                 else
427                         priv->basic_rate_mask = info->basic_rates;
428                 p54_setup_mac(priv);
429                 if (priv->fw_var >= 0x500)
430                         p54_scan(priv, P54_SCAN_EXIT, 0);
431         }
432         if (changed & BSS_CHANGED_ASSOC) {
433                 if (info->assoc) {
434                         priv->aid = info->aid;
435                         priv->wakeup_timer = info->beacon_int *
436                                              info->dtim_period * 5;
437                         p54_setup_mac(priv);
438                 } else {
439                         priv->wakeup_timer = 500;
440                         priv->aid = 0;
441                 }
442         }
443
444         mutex_unlock(&priv->conf_mutex);
445 }
446
447 static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
448                        struct ieee80211_vif *vif, struct ieee80211_sta *sta,
449                        struct ieee80211_key_conf *key)
450 {
451         struct p54_common *priv = dev->priv;
452         int slot, ret = 0;
453         u8 algo = 0;
454         u8 *addr = NULL;
455
456         if (modparam_nohwcrypt)
457                 return -EOPNOTSUPP;
458
459         mutex_lock(&priv->conf_mutex);
460         if (cmd == SET_KEY) {
461                 switch (key->cipher) {
462                 case WLAN_CIPHER_SUITE_TKIP:
463                         if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL |
464                               BR_DESC_PRIV_CAP_TKIP))) {
465                                 ret = -EOPNOTSUPP;
466                                 goto out_unlock;
467                         }
468                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
469                         algo = P54_CRYPTO_TKIPMICHAEL;
470                         break;
471                 case WLAN_CIPHER_SUITE_WEP40:
472                 case WLAN_CIPHER_SUITE_WEP104:
473                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) {
474                                 ret = -EOPNOTSUPP;
475                                 goto out_unlock;
476                         }
477                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
478                         algo = P54_CRYPTO_WEP;
479                         break;
480                 case WLAN_CIPHER_SUITE_CCMP:
481                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) {
482                                 ret = -EOPNOTSUPP;
483                                 goto out_unlock;
484                         }
485                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
486                         algo = P54_CRYPTO_AESCCMP;
487                         break;
488                 default:
489                         ret = -EOPNOTSUPP;
490                         goto out_unlock;
491                 }
492                 slot = bitmap_find_free_region(priv->used_rxkeys,
493                                                priv->rx_keycache_size, 0);
494
495                 if (slot < 0) {
496                         /*
497                          * The device supports the chosen algorithm, but the
498                          * firmware does not provide enough key slots to store
499                          * all of them.
500                          * But encryption offload for outgoing frames is always
501                          * possible, so we just pretend that the upload was
502                          * successful and do the decryption in software.
503                          */
504
505                         /* mark the key as invalid. */
506                         key->hw_key_idx = 0xff;
507                         goto out_unlock;
508                 }
509         } else {
510                 slot = key->hw_key_idx;
511
512                 if (slot == 0xff) {
513                         /* This key was not uploaded into the rx key cache. */
514
515                         goto out_unlock;
516                 }
517
518                 bitmap_release_region(priv->used_rxkeys, slot, 0);
519                 algo = 0;
520         }
521
522         if (sta)
523                 addr = sta->addr;
524
525         ret = p54_upload_key(priv, algo, slot, key->keyidx,
526                              key->keylen, addr, key->key);
527         if (ret) {
528                 bitmap_release_region(priv->used_rxkeys, slot, 0);
529                 ret = -EOPNOTSUPP;
530                 goto out_unlock;
531         }
532
533         key->hw_key_idx = slot;
534
535 out_unlock:
536         mutex_unlock(&priv->conf_mutex);
537         return ret;
538 }
539
540 static int p54_get_survey(struct ieee80211_hw *dev, int idx,
541                                 struct survey_info *survey)
542 {
543         struct p54_common *priv = dev->priv;
544         struct ieee80211_conf *conf = &dev->conf;
545
546         if (idx != 0)
547                 return -ENOENT;
548
549         survey->channel = conf->channel;
550         survey->filled = SURVEY_INFO_NOISE_DBM;
551         survey->noise = clamp_t(s8, priv->noise, -128, 127);
552
553         return 0;
554 }
555
556 static unsigned int p54_flush_count(struct p54_common *priv)
557 {
558         unsigned int total = 0, i;
559
560         BUILD_BUG_ON(P54_QUEUE_NUM > ARRAY_SIZE(priv->tx_stats));
561
562         /*
563          * Because the firmware has the sole control over any frames
564          * in the P54_QUEUE_BEACON or P54_QUEUE_SCAN queues, they
565          * don't really count as pending or active.
566          */
567         for (i = P54_QUEUE_MGMT; i < P54_QUEUE_NUM; i++)
568                 total += priv->tx_stats[i].len;
569         return total;
570 }
571
572 static void p54_flush(struct ieee80211_hw *dev, bool drop)
573 {
574         struct p54_common *priv = dev->priv;
575         unsigned int total, i;
576
577         /*
578          * Currently, it wouldn't really matter if we wait for one second
579          * or 15 minutes. But once someone gets around and completes the
580          * TODOs [ancel stuck frames / reset device] in p54_work, it will
581          * suddenly make sense to wait that long.
582          */
583         i = P54_STATISTICS_UPDATE * 2 / 20;
584
585         /*
586          * In this case no locking is required because as we speak the
587          * queues have already been stopped and no new frames can sneak
588          * up from behind.
589          */
590         while ((total = p54_flush_count(priv) && i--)) {
591                 /* waste time */
592                 msleep(20);
593         }
594
595         WARN(total, "tx flush timeout, unresponsive firmware");
596 }
597
598 static void p54_set_coverage_class(struct ieee80211_hw *dev, u8 coverage_class)
599 {
600         struct p54_common *priv = dev->priv;
601
602         mutex_lock(&priv->conf_mutex);
603         /* support all coverage class values as in 802.11-2007 Table 7-27 */
604         priv->coverage_class = clamp_t(u8, coverage_class, 0, 31);
605         p54_set_edcf(priv);
606         mutex_unlock(&priv->conf_mutex);
607 }
608
609 static const struct ieee80211_ops p54_ops = {
610         .tx                     = p54_tx_80211,
611         .start                  = p54_start,
612         .stop                   = p54_stop,
613         .add_interface          = p54_add_interface,
614         .remove_interface       = p54_remove_interface,
615         .set_tim                = p54_set_tim,
616         .sta_notify             = p54_sta_notify,
617         .sta_add                = p54_sta_add_remove,
618         .sta_remove             = p54_sta_add_remove,
619         .set_key                = p54_set_key,
620         .config                 = p54_config,
621         .flush                  = p54_flush,
622         .bss_info_changed       = p54_bss_info_changed,
623         .prepare_multicast      = p54_prepare_multicast,
624         .configure_filter       = p54_configure_filter,
625         .conf_tx                = p54_conf_tx,
626         .get_stats              = p54_get_stats,
627         .get_survey             = p54_get_survey,
628         .set_coverage_class     = p54_set_coverage_class,
629 };
630
631 struct ieee80211_hw *p54_init_common(size_t priv_data_len)
632 {
633         struct ieee80211_hw *dev;
634         struct p54_common *priv;
635
636         dev = ieee80211_alloc_hw(priv_data_len, &p54_ops);
637         if (!dev)
638                 return NULL;
639
640         priv = dev->priv;
641         priv->hw = dev;
642         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
643         priv->basic_rate_mask = 0x15f;
644         spin_lock_init(&priv->tx_stats_lock);
645         skb_queue_head_init(&priv->tx_queue);
646         skb_queue_head_init(&priv->tx_pending);
647         dev->flags = IEEE80211_HW_RX_INCLUDES_FCS |
648                      IEEE80211_HW_SIGNAL_DBM |
649                      IEEE80211_HW_SUPPORTS_PS |
650                      IEEE80211_HW_PS_NULLFUNC_STACK |
651                      IEEE80211_HW_BEACON_FILTER |
652                      IEEE80211_HW_REPORTS_TX_ACK_STATUS;
653
654         dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
655                                       BIT(NL80211_IFTYPE_ADHOC) |
656                                       BIT(NL80211_IFTYPE_AP) |
657                                       BIT(NL80211_IFTYPE_MESH_POINT);
658
659         dev->channel_change_time = 1000;        /* TODO: find actual value */
660         priv->beacon_req_id = cpu_to_le32(0);
661         priv->tx_stats[P54_QUEUE_BEACON].limit = 1;
662         priv->tx_stats[P54_QUEUE_FWSCAN].limit = 1;
663         priv->tx_stats[P54_QUEUE_MGMT].limit = 3;
664         priv->tx_stats[P54_QUEUE_CAB].limit = 3;
665         priv->tx_stats[P54_QUEUE_DATA].limit = 5;
666         dev->queues = 1;
667         priv->noise = -94;
668         /*
669          * We support at most 8 tries no matter which rate they're at,
670          * we cannot support max_rates * max_rate_tries as we set it
671          * here, but setting it correctly to 4/2 or so would limit us
672          * artificially if the RC algorithm wants just two rates, so
673          * let's say 4/7, we'll redistribute it at TX time, see the
674          * comments there.
675          */
676         dev->max_rates = 4;
677         dev->max_rate_tries = 7;
678         dev->extra_tx_headroom = sizeof(struct p54_hdr) + 4 +
679                                  sizeof(struct p54_tx_data);
680
681         /*
682          * For now, disable PS by default because it affects
683          * link stability significantly.
684          */
685         dev->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
686
687         mutex_init(&priv->conf_mutex);
688         mutex_init(&priv->eeprom_mutex);
689         init_completion(&priv->eeprom_comp);
690         init_completion(&priv->beacon_comp);
691         INIT_DELAYED_WORK(&priv->work, p54_work);
692
693         memset(&priv->mc_maclist[0], ~0, ETH_ALEN);
694         return dev;
695 }
696 EXPORT_SYMBOL_GPL(p54_init_common);
697
698 int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
699 {
700         struct p54_common __maybe_unused *priv = dev->priv;
701         int err;
702
703         err = ieee80211_register_hw(dev);
704         if (err) {
705                 dev_err(pdev, "Cannot register device (%d).\n", err);
706                 return err;
707         }
708
709 #ifdef CONFIG_P54_LEDS
710         err = p54_init_leds(priv);
711         if (err)
712                 return err;
713 #endif /* CONFIG_P54_LEDS */
714
715         dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy));
716         return 0;
717 }
718 EXPORT_SYMBOL_GPL(p54_register_common);
719
720 void p54_free_common(struct ieee80211_hw *dev)
721 {
722         struct p54_common *priv = dev->priv;
723         unsigned int i;
724
725         for (i = 0; i < IEEE80211_NUM_BANDS; i++)
726                 kfree(priv->band_table[i]);
727
728         kfree(priv->iq_autocal);
729         kfree(priv->output_limit);
730         kfree(priv->curve_data);
731         kfree(priv->rssi_db);
732         kfree(priv->used_rxkeys);
733         priv->iq_autocal = NULL;
734         priv->output_limit = NULL;
735         priv->curve_data = NULL;
736         priv->rssi_db = NULL;
737         priv->used_rxkeys = NULL;
738         ieee80211_free_hw(dev);
739 }
740 EXPORT_SYMBOL_GPL(p54_free_common);
741
742 void p54_unregister_common(struct ieee80211_hw *dev)
743 {
744         struct p54_common *priv = dev->priv;
745
746 #ifdef CONFIG_P54_LEDS
747         p54_unregister_leds(priv);
748 #endif /* CONFIG_P54_LEDS */
749
750         ieee80211_unregister_hw(dev);
751         mutex_destroy(&priv->conf_mutex);
752         mutex_destroy(&priv->eeprom_mutex);
753 }
754 EXPORT_SYMBOL_GPL(p54_unregister_common);