4a741df9c081e08efeec3c1e9bb917716bcbebec
[pandora-kernel.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/firmware.h>
21 #include <linux/etherdevice.h>
22
23 #include <net/mac80211.h>
24
25 #include "p54.h"
26 #include "lmac.h"
27
28 static int modparam_nohwcrypt;
29 module_param_named(nohwcrypt, modparam_nohwcrypt, bool, S_IRUGO);
30 MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");
31 MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
32 MODULE_DESCRIPTION("Softmac Prism54 common code");
33 MODULE_LICENSE("GPL");
34 MODULE_ALIAS("prism54common");
35
36 static void p54_sta_notify(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
37                               enum sta_notify_cmd notify_cmd,
38                               struct ieee80211_sta *sta)
39 {
40         struct p54_common *priv = dev->priv;
41         switch (notify_cmd) {
42         case STA_NOTIFY_ADD:
43         case STA_NOTIFY_REMOVE:
44                 /*
45                  * Notify the firmware that we don't want or we don't
46                  * need to buffer frames for this station anymore.
47                  */
48
49                 p54_sta_unlock(priv, sta->addr);
50                 break;
51         case STA_NOTIFY_AWAKE:
52                 /* update the firmware's filter table */
53                 p54_sta_unlock(priv, sta->addr);
54                 break;
55         default:
56                 break;
57         }
58 }
59
60 static int p54_set_tim(struct ieee80211_hw *dev, struct ieee80211_sta *sta,
61                         bool set)
62 {
63         struct p54_common *priv = dev->priv;
64
65         return p54_update_beacon_tim(priv, sta->aid, set);
66 }
67
68 u8 *p54_find_ie(struct sk_buff *skb, u8 ie)
69 {
70         struct ieee80211_mgmt *mgmt = (void *)skb->data;
71         u8 *pos, *end;
72
73         if (skb->len <= sizeof(mgmt))
74                 return NULL;
75
76         pos = (u8 *)mgmt->u.beacon.variable;
77         end = skb->data + skb->len;
78         while (pos < end) {
79                 if (pos + 2 + pos[1] > end)
80                         return NULL;
81
82                 if (pos[0] == ie)
83                         return pos;
84
85                 pos += 2 + pos[1];
86         }
87         return NULL;
88 }
89
90 static int p54_beacon_format_ie_tim(struct sk_buff *skb)
91 {
92         /*
93          * the good excuse for this mess is ... the firmware.
94          * The dummy TIM MUST be at the end of the beacon frame,
95          * because it'll be overwritten!
96          */
97         u8 *tim;
98         u8 dtim_len;
99         u8 dtim_period;
100         u8 *next;
101
102         tim = p54_find_ie(skb, WLAN_EID_TIM);
103         if (!tim)
104                 return 0;
105
106         dtim_len = tim[1];
107         dtim_period = tim[3];
108         next = tim + 2 + dtim_len;
109
110         if (dtim_len < 3)
111                 return -EINVAL;
112
113         memmove(tim, next, skb_tail_pointer(skb) - next);
114         tim = skb_tail_pointer(skb) - (dtim_len + 2);
115
116         /* add the dummy at the end */
117         tim[0] = WLAN_EID_TIM;
118         tim[1] = 3;
119         tim[2] = 0;
120         tim[3] = dtim_period;
121         tim[4] = 0;
122
123         if (dtim_len > 3)
124                 skb_trim(skb, skb->len - (dtim_len - 3));
125
126         return 0;
127 }
128
129 static int p54_beacon_update(struct p54_common *priv,
130                         struct ieee80211_vif *vif)
131 {
132         struct sk_buff *beacon;
133         int ret;
134
135         beacon = ieee80211_beacon_get(priv->hw, vif);
136         if (!beacon)
137                 return -ENOMEM;
138         ret = p54_beacon_format_ie_tim(beacon);
139         if (ret)
140                 return ret;
141
142         /*
143          * During operation, the firmware takes care of beaconing.
144          * The driver only needs to upload a new beacon template, once
145          * the template was changed by the stack or userspace.
146          *
147          * LMAC API 3.2.2 also specifies that the driver does not need
148          * to cancel the old beacon template by hand, instead the firmware
149          * will release the previous one through the feedback mechanism.
150          */
151         WARN_ON(p54_tx_80211(priv->hw, beacon));
152         priv->tsf_high32 = 0;
153         priv->tsf_low32 = 0;
154
155         return 0;
156 }
157
158 static int p54_start(struct ieee80211_hw *dev)
159 {
160         struct p54_common *priv = dev->priv;
161         int err;
162
163         mutex_lock(&priv->conf_mutex);
164         err = priv->open(dev);
165         if (err)
166                 goto out;
167         P54_SET_QUEUE(priv->qos_params[0], 0x0002, 0x0003, 0x0007, 47);
168         P54_SET_QUEUE(priv->qos_params[1], 0x0002, 0x0007, 0x000f, 94);
169         P54_SET_QUEUE(priv->qos_params[2], 0x0003, 0x000f, 0x03ff, 0);
170         P54_SET_QUEUE(priv->qos_params[3], 0x0007, 0x000f, 0x03ff, 0);
171         err = p54_set_edcf(priv);
172         if (err)
173                 goto out;
174
175         memset(priv->bssid, ~0, ETH_ALEN);
176         priv->mode = NL80211_IFTYPE_MONITOR;
177         err = p54_setup_mac(priv);
178         if (err) {
179                 priv->mode = NL80211_IFTYPE_UNSPECIFIED;
180                 goto out;
181         }
182
183         ieee80211_queue_delayed_work(dev, &priv->work, 0);
184
185         priv->softled_state = 0;
186         err = p54_set_leds(priv);
187
188 out:
189         mutex_unlock(&priv->conf_mutex);
190         return err;
191 }
192
193 static void p54_stop(struct ieee80211_hw *dev)
194 {
195         struct p54_common *priv = dev->priv;
196         int i;
197
198         mutex_lock(&priv->conf_mutex);
199         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
200         priv->softled_state = 0;
201         p54_set_leds(priv);
202
203         cancel_delayed_work_sync(&priv->work);
204
205         priv->stop(dev);
206         skb_queue_purge(&priv->tx_pending);
207         skb_queue_purge(&priv->tx_queue);
208         for (i = 0; i < P54_QUEUE_NUM; i++) {
209                 priv->tx_stats[i].count = 0;
210                 priv->tx_stats[i].len = 0;
211         }
212
213         priv->beacon_req_id = cpu_to_le32(0);
214         priv->tsf_high32 = priv->tsf_low32 = 0;
215         mutex_unlock(&priv->conf_mutex);
216 }
217
218 static int p54_add_interface(struct ieee80211_hw *dev,
219                              struct ieee80211_if_init_conf *conf)
220 {
221         struct p54_common *priv = dev->priv;
222
223         mutex_lock(&priv->conf_mutex);
224         if (priv->mode != NL80211_IFTYPE_MONITOR) {
225                 mutex_unlock(&priv->conf_mutex);
226                 return -EOPNOTSUPP;
227         }
228
229         priv->vif = conf->vif;
230
231         switch (conf->type) {
232         case NL80211_IFTYPE_STATION:
233         case NL80211_IFTYPE_ADHOC:
234         case NL80211_IFTYPE_AP:
235         case NL80211_IFTYPE_MESH_POINT:
236                 priv->mode = conf->type;
237                 break;
238         default:
239                 mutex_unlock(&priv->conf_mutex);
240                 return -EOPNOTSUPP;
241         }
242
243         memcpy(priv->mac_addr, conf->mac_addr, ETH_ALEN);
244         p54_setup_mac(priv);
245         mutex_unlock(&priv->conf_mutex);
246         return 0;
247 }
248
249 static void p54_remove_interface(struct ieee80211_hw *dev,
250                                  struct ieee80211_if_init_conf *conf)
251 {
252         struct p54_common *priv = dev->priv;
253
254         mutex_lock(&priv->conf_mutex);
255         priv->vif = NULL;
256
257         /*
258          * LMAC API 3.2.2 states that any active beacon template must be
259          * canceled by the driver before attempting a mode transition.
260          */
261         if (le32_to_cpu(priv->beacon_req_id) != 0) {
262                 p54_tx_cancel(priv, priv->beacon_req_id);
263                 wait_for_completion_interruptible_timeout(&priv->beacon_comp, HZ);
264         }
265         priv->mode = NL80211_IFTYPE_MONITOR;
266         memset(priv->mac_addr, 0, ETH_ALEN);
267         memset(priv->bssid, 0, ETH_ALEN);
268         p54_setup_mac(priv);
269         mutex_unlock(&priv->conf_mutex);
270 }
271
272 static int p54_config(struct ieee80211_hw *dev, u32 changed)
273 {
274         int ret = 0;
275         struct p54_common *priv = dev->priv;
276         struct ieee80211_conf *conf = &dev->conf;
277
278         mutex_lock(&priv->conf_mutex);
279         if (changed & IEEE80211_CONF_CHANGE_POWER)
280                 priv->output_power = conf->power_level << 2;
281         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
282                 ret = p54_scan(priv, P54_SCAN_EXIT, 0);
283                 if (ret)
284                         goto out;
285         }
286         if (changed & IEEE80211_CONF_CHANGE_PS) {
287                 ret = p54_set_ps(priv);
288                 if (ret)
289                         goto out;
290         }
291         if (changed & IEEE80211_CONF_CHANGE_IDLE) {
292                 ret = p54_setup_mac(priv);
293                 if (ret)
294                         goto out;
295         }
296
297 out:
298         mutex_unlock(&priv->conf_mutex);
299         return ret;
300 }
301
302 static void p54_configure_filter(struct ieee80211_hw *dev,
303                                  unsigned int changed_flags,
304                                  unsigned int *total_flags,
305                                  int mc_count, struct dev_mc_list *mclist)
306 {
307         struct p54_common *priv = dev->priv;
308
309         *total_flags &= FIF_PROMISC_IN_BSS |
310                         FIF_OTHER_BSS;
311
312         priv->filter_flags = *total_flags;
313
314         if (changed_flags & (FIF_PROMISC_IN_BSS | FIF_OTHER_BSS))
315                 p54_setup_mac(priv);
316 }
317
318 static int p54_conf_tx(struct ieee80211_hw *dev, u16 queue,
319                        const struct ieee80211_tx_queue_params *params)
320 {
321         struct p54_common *priv = dev->priv;
322         int ret;
323
324         mutex_lock(&priv->conf_mutex);
325         if (queue < dev->queues) {
326                 P54_SET_QUEUE(priv->qos_params[queue], params->aifs,
327                         params->cw_min, params->cw_max, params->txop);
328                 ret = p54_set_edcf(priv);
329         } else
330                 ret = -EINVAL;
331         mutex_unlock(&priv->conf_mutex);
332         return ret;
333 }
334
335 static void p54_work(struct work_struct *work)
336 {
337         struct p54_common *priv = container_of(work, struct p54_common,
338                                                work.work);
339
340         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
341                 return ;
342
343         /*
344          * TODO: walk through tx_queue and do the following tasks
345          *      1. initiate bursts.
346          *      2. cancel stuck frames / reset the device if necessary.
347          */
348
349         p54_fetch_statistics(priv);
350 }
351
352 static int p54_get_stats(struct ieee80211_hw *dev,
353                          struct ieee80211_low_level_stats *stats)
354 {
355         struct p54_common *priv = dev->priv;
356
357         memcpy(stats, &priv->stats, sizeof(*stats));
358         return 0;
359 }
360
361 static int p54_get_tx_stats(struct ieee80211_hw *dev,
362                             struct ieee80211_tx_queue_stats *stats)
363 {
364         struct p54_common *priv = dev->priv;
365
366         memcpy(stats, &priv->tx_stats[P54_QUEUE_DATA],
367                sizeof(stats[0]) * dev->queues);
368         return 0;
369 }
370
371 static void p54_bss_info_changed(struct ieee80211_hw *dev,
372                                  struct ieee80211_vif *vif,
373                                  struct ieee80211_bss_conf *info,
374                                  u32 changed)
375 {
376         struct p54_common *priv = dev->priv;
377
378         mutex_lock(&priv->conf_mutex);
379         if (changed & BSS_CHANGED_BSSID) {
380                 memcpy(priv->bssid, info->bssid, ETH_ALEN);
381                 p54_setup_mac(priv);
382         }
383
384         if (changed & BSS_CHANGED_BEACON) {
385                 p54_scan(priv, P54_SCAN_EXIT, 0);
386                 p54_setup_mac(priv);
387                 p54_beacon_update(priv, vif);
388                 p54_set_edcf(priv);
389         }
390
391         if (changed & (BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BEACON)) {
392                 priv->use_short_slot = info->use_short_slot;
393                 p54_set_edcf(priv);
394         }
395         if (changed & BSS_CHANGED_BASIC_RATES) {
396                 if (dev->conf.channel->band == IEEE80211_BAND_5GHZ)
397                         priv->basic_rate_mask = (info->basic_rates << 4);
398                 else
399                         priv->basic_rate_mask = info->basic_rates;
400                 p54_setup_mac(priv);
401                 if (priv->fw_var >= 0x500)
402                         p54_scan(priv, P54_SCAN_EXIT, 0);
403         }
404         if (changed & BSS_CHANGED_ASSOC) {
405                 if (info->assoc) {
406                         priv->aid = info->aid;
407                         priv->wakeup_timer = info->beacon_int *
408                                              info->dtim_period * 5;
409                         p54_setup_mac(priv);
410                 } else {
411                         priv->wakeup_timer = 500;
412                         priv->aid = 0;
413                 }
414         }
415
416         mutex_unlock(&priv->conf_mutex);
417 }
418
419 static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
420                        struct ieee80211_vif *vif, struct ieee80211_sta *sta,
421                        struct ieee80211_key_conf *key)
422 {
423         struct p54_common *priv = dev->priv;
424         int slot, ret = 0;
425         u8 algo = 0;
426         u8 *addr = NULL;
427
428         if (modparam_nohwcrypt)
429                 return -EOPNOTSUPP;
430
431         mutex_lock(&priv->conf_mutex);
432         if (cmd == SET_KEY) {
433                 switch (key->alg) {
434                 case ALG_TKIP:
435                         if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL |
436                               BR_DESC_PRIV_CAP_TKIP))) {
437                                 ret = -EOPNOTSUPP;
438                                 goto out_unlock;
439                         }
440                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
441                         algo = P54_CRYPTO_TKIPMICHAEL;
442                         break;
443                 case ALG_WEP:
444                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) {
445                                 ret = -EOPNOTSUPP;
446                                 goto out_unlock;
447                         }
448                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
449                         algo = P54_CRYPTO_WEP;
450                         break;
451                 case ALG_CCMP:
452                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) {
453                                 ret = -EOPNOTSUPP;
454                                 goto out_unlock;
455                         }
456                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
457                         algo = P54_CRYPTO_AESCCMP;
458                         break;
459                 default:
460                         ret = -EOPNOTSUPP;
461                         goto out_unlock;
462                 }
463                 slot = bitmap_find_free_region(priv->used_rxkeys,
464                                                priv->rx_keycache_size, 0);
465
466                 if (slot < 0) {
467                         /*
468                          * The device supports the choosen algorithm, but the
469                          * firmware does not provide enough key slots to store
470                          * all of them.
471                          * But encryption offload for outgoing frames is always
472                          * possible, so we just pretend that the upload was
473                          * successful and do the decryption in software.
474                          */
475
476                         /* mark the key as invalid. */
477                         key->hw_key_idx = 0xff;
478                         goto out_unlock;
479                 }
480         } else {
481                 slot = key->hw_key_idx;
482
483                 if (slot == 0xff) {
484                         /* This key was not uploaded into the rx key cache. */
485
486                         goto out_unlock;
487                 }
488
489                 bitmap_release_region(priv->used_rxkeys, slot, 0);
490                 algo = 0;
491         }
492
493         if (sta)
494                 addr = sta->addr;
495
496         ret = p54_upload_key(priv, algo, slot, key->keyidx,
497                              key->keylen, addr, key->key);
498         if (ret) {
499                 bitmap_release_region(priv->used_rxkeys, slot, 0);
500                 ret = -EOPNOTSUPP;
501                 goto out_unlock;
502         }
503
504         key->hw_key_idx = slot;
505
506 out_unlock:
507         mutex_unlock(&priv->conf_mutex);
508         return ret;
509 }
510
511 static const struct ieee80211_ops p54_ops = {
512         .tx                     = p54_tx_80211,
513         .start                  = p54_start,
514         .stop                   = p54_stop,
515         .add_interface          = p54_add_interface,
516         .remove_interface       = p54_remove_interface,
517         .set_tim                = p54_set_tim,
518         .sta_notify             = p54_sta_notify,
519         .set_key                = p54_set_key,
520         .config                 = p54_config,
521         .bss_info_changed       = p54_bss_info_changed,
522         .configure_filter       = p54_configure_filter,
523         .conf_tx                = p54_conf_tx,
524         .get_stats              = p54_get_stats,
525         .get_tx_stats           = p54_get_tx_stats
526 };
527
528 struct ieee80211_hw *p54_init_common(size_t priv_data_len)
529 {
530         struct ieee80211_hw *dev;
531         struct p54_common *priv;
532
533         dev = ieee80211_alloc_hw(priv_data_len, &p54_ops);
534         if (!dev)
535                 return NULL;
536
537         priv = dev->priv;
538         priv->hw = dev;
539         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
540         priv->basic_rate_mask = 0x15f;
541         spin_lock_init(&priv->tx_stats_lock);
542         skb_queue_head_init(&priv->tx_queue);
543         skb_queue_head_init(&priv->tx_pending);
544         dev->flags = IEEE80211_HW_RX_INCLUDES_FCS |
545                      IEEE80211_HW_SIGNAL_DBM |
546                      IEEE80211_HW_SUPPORTS_PS |
547                      IEEE80211_HW_PS_NULLFUNC_STACK |
548                      IEEE80211_HW_BEACON_FILTER |
549                      IEEE80211_HW_NOISE_DBM;
550
551         dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
552                                       BIT(NL80211_IFTYPE_ADHOC) |
553                                       BIT(NL80211_IFTYPE_AP) |
554                                       BIT(NL80211_IFTYPE_MESH_POINT);
555
556         dev->channel_change_time = 1000;        /* TODO: find actual value */
557         priv->beacon_req_id = cpu_to_le32(0);
558         priv->tx_stats[P54_QUEUE_BEACON].limit = 1;
559         priv->tx_stats[P54_QUEUE_FWSCAN].limit = 1;
560         priv->tx_stats[P54_QUEUE_MGMT].limit = 3;
561         priv->tx_stats[P54_QUEUE_CAB].limit = 3;
562         priv->tx_stats[P54_QUEUE_DATA].limit = 5;
563         dev->queues = 1;
564         priv->noise = -94;
565         /*
566          * We support at most 8 tries no matter which rate they're at,
567          * we cannot support max_rates * max_rate_tries as we set it
568          * here, but setting it correctly to 4/2 or so would limit us
569          * artificially if the RC algorithm wants just two rates, so
570          * let's say 4/7, we'll redistribute it at TX time, see the
571          * comments there.
572          */
573         dev->max_rates = 4;
574         dev->max_rate_tries = 7;
575         dev->extra_tx_headroom = sizeof(struct p54_hdr) + 4 +
576                                  sizeof(struct p54_tx_data);
577
578         mutex_init(&priv->conf_mutex);
579         mutex_init(&priv->eeprom_mutex);
580         init_completion(&priv->eeprom_comp);
581         init_completion(&priv->beacon_comp);
582         INIT_DELAYED_WORK(&priv->work, p54_work);
583
584         return dev;
585 }
586 EXPORT_SYMBOL_GPL(p54_init_common);
587
588 int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
589 {
590         struct p54_common *priv = dev->priv;
591         int err;
592
593         err = ieee80211_register_hw(dev);
594         if (err) {
595                 dev_err(pdev, "Cannot register device (%d).\n", err);
596                 return err;
597         }
598
599 #ifdef CONFIG_P54_LEDS
600         err = p54_init_leds(priv);
601         if (err)
602                 return err;
603 #endif /* CONFIG_P54_LEDS */
604
605         dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy));
606         return 0;
607 }
608 EXPORT_SYMBOL_GPL(p54_register_common);
609
610 void p54_free_common(struct ieee80211_hw *dev)
611 {
612         struct p54_common *priv = dev->priv;
613         unsigned int i;
614
615         for (i = 0; i < IEEE80211_NUM_BANDS; i++)
616                 kfree(priv->band_table[i]);
617
618         kfree(priv->iq_autocal);
619         kfree(priv->output_limit);
620         kfree(priv->curve_data);
621         kfree(priv->used_rxkeys);
622         priv->iq_autocal = NULL;
623         priv->output_limit = NULL;
624         priv->curve_data = NULL;
625         priv->used_rxkeys = NULL;
626         ieee80211_free_hw(dev);
627 }
628 EXPORT_SYMBOL_GPL(p54_free_common);
629
630 void p54_unregister_common(struct ieee80211_hw *dev)
631 {
632         struct p54_common *priv = dev->priv;
633
634 #ifdef CONFIG_P54_LEDS
635         p54_unregister_leds(priv);
636 #endif /* CONFIG_P54_LEDS */
637
638         ieee80211_unregister_hw(dev);
639         mutex_destroy(&priv->conf_mutex);
640         mutex_destroy(&priv->eeprom_mutex);
641 }
642 EXPORT_SYMBOL_GPL(p54_unregister_common);