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         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 208         priv->softled_state = 0;
 209         cancel_delayed_work_sync(&priv->work);
 210         mutex_lock(&priv->conf_mutex);
 211         p54_set_leds(priv);
 212         priv->stop(dev);
 213         skb_queue_purge(&priv->tx_pending);
 214         skb_queue_purge(&priv->tx_queue);
 215         for (i = 0; i < P54_QUEUE_NUM; i++) {
 216                 priv->tx_stats[i].count = 0;
 217                 priv->tx_stats[i].len = 0;
 218         }
 219
 220         priv->beacon_req_id = cpu_to_le32(0);
 221         priv->tsf_high32 = priv->tsf_low32 = 0;
 222         mutex_unlock(&priv->conf_mutex);
 223 }
 224
 225 static int p54_add_interface(struct ieee80211_hw *dev,
 226                              struct ieee80211_vif *vif)
 227 {
 228         struct p54_common *priv = dev->priv;
 229
 230         mutex_lock(&priv->conf_mutex);
 231         if (priv->mode != NL80211_IFTYPE_MONITOR) {
 232                 mutex_unlock(&priv->conf_mutex);
 233                 return -EOPNOTSUPP;
 234         }
 235
 236         priv->vif = vif;
 237
 238         switch (vif->type) {
 239         case NL80211_IFTYPE_STATION:
 240         case NL80211_IFTYPE_ADHOC:
 241         case NL80211_IFTYPE_AP:
 242         case NL80211_IFTYPE_MESH_POINT:
 243                 priv->mode = vif->type;
 244                 break;
 245         default:
 246                 mutex_unlock(&priv->conf_mutex);
 247                 return -EOPNOTSUPP;
 248         }
 249
 250         memcpy(priv->mac_addr, vif->addr, ETH_ALEN);
 251         p54_setup_mac(priv);
 252         mutex_unlock(&priv->conf_mutex);
 253         return 0;
 254 }
 255
 256 static void p54_remove_interface(struct ieee80211_hw *dev,
 257                                  struct ieee80211_vif *vif)
 258 {
 259         struct p54_common *priv = dev->priv;
 260
 261         mutex_lock(&priv->conf_mutex);
 262         priv->vif = NULL;
 263
 264         /*
 265          * LMAC API 3.2.2 states that any active beacon template must be
 266          * canceled by the driver before attempting a mode transition.
 267          */
 268         if (le32_to_cpu(priv->beacon_req_id) != 0) {
 269                 p54_tx_cancel(priv, priv->beacon_req_id);
 270                 wait_for_completion_interruptible_timeout(&priv->beacon_comp, HZ);
 271         }
 272         priv->mode = NL80211_IFTYPE_MONITOR;
 273         memset(priv->mac_addr, 0, ETH_ALEN);
 274         memset(priv->bssid, 0, ETH_ALEN);
 275         p54_setup_mac(priv);
 276         mutex_unlock(&priv->conf_mutex);
 277 }
 278
 279 static int p54_wait_for_stats(struct ieee80211_hw *dev)
 280 {
 281         struct p54_common *priv = dev->priv;
 282         int ret;
 283
 284         priv->update_stats = true;
 285         ret = p54_fetch_statistics(priv);
 286         if (ret)
 287                 return ret;
 288
 289         ret = wait_for_completion_interruptible_timeout(&priv->stat_comp, HZ);
 290         if (ret == 0)
 291                 return -ETIMEDOUT;
 292
 293         return 0;
 294 }
 295
 296 static void p54_reset_stats(struct p54_common *priv)
 297 {
 298         struct ieee80211_channel *chan = priv->curchan;
 299
 300         if (chan) {
 301                 struct survey_info *info = &priv->survey[chan->hw_value];
 302
 303                 /* only reset channel statistics, don't touch .filled, etc. */
 304                 info->channel_time = 0;
 305                 info->channel_time_busy = 0;
 306                 info->channel_time_tx = 0;
 307         }
 308
 309         priv->update_stats = true;
 310         priv->survey_raw.active = 0;
 311         priv->survey_raw.cca = 0;
 312         priv->survey_raw.tx = 0;
 313 }
 314
 315 static int p54_config(struct ieee80211_hw *dev, u32 changed)
 316 {
 317         int ret = 0;
 318         struct p54_common *priv = dev->priv;
 319         struct ieee80211_conf *conf = &dev->conf;
 320
 321         mutex_lock(&priv->conf_mutex);
 322         if (changed & IEEE80211_CONF_CHANGE_POWER)
 323                 priv->output_power = conf->power_level << 2;
 324         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 325                 struct ieee80211_channel *oldchan;
 326                 WARN_ON(p54_wait_for_stats(dev));
 327                 oldchan = priv->curchan;
 328                 priv->curchan = NULL;
 329                 ret = p54_scan(priv, P54_SCAN_EXIT, 0);
 330                 if (ret) {
 331                         priv->curchan = oldchan;
 332                         goto out;
 333                 }
 334                 /*
 335                  * TODO: Use the LM_SCAN_TRAP to determine the current
 336                  * operating channel.
 337                  */
 338                 priv->curchan = priv->hw->conf.channel;
 339                 p54_reset_stats(priv);
 340                 WARN_ON(p54_fetch_statistics(priv));
 341         }
 342         if (changed & IEEE80211_CONF_CHANGE_PS) {
 343                 WARN_ON(p54_wait_for_stats(dev));
 344                 ret = p54_set_ps(priv);
 345                 if (ret)
 346                         goto out;
 347                 WARN_ON(p54_wait_for_stats(dev));
 348         }
 349         if (changed & IEEE80211_CONF_CHANGE_IDLE) {
 350                 WARN_ON(p54_wait_for_stats(dev));
 351                 ret = p54_setup_mac(priv);
 352                 if (ret)
 353                         goto out;
 354                 WARN_ON(p54_wait_for_stats(dev));
 355         }
 356
 357 out:
 358         mutex_unlock(&priv->conf_mutex);
 359         return ret;
 360 }
 361
 362 static u64 p54_prepare_multicast(struct ieee80211_hw *dev,
 363                                  struct netdev_hw_addr_list *mc_list)
 364 {
 365         struct p54_common *priv = dev->priv;
 366         struct netdev_hw_addr *ha;
 367         int i;
 368
 369         BUILD_BUG_ON(ARRAY_SIZE(priv->mc_maclist) !=
 370                 ARRAY_SIZE(((struct p54_group_address_table *)NULL)->mac_list));
 371         /*
 372          * The first entry is reserved for the global broadcast MAC.
 373          * Otherwise the firmware will drop it and ARP will no longer work.
 374          */
 375         i = 1;
 376         priv->mc_maclist_num = netdev_hw_addr_list_count(mc_list) + i;
 377         netdev_hw_addr_list_for_each(ha, mc_list) {
 378                 memcpy(&priv->mc_maclist[i], ha->addr, ETH_ALEN);
 379                 i++;
 380                 if (i >= ARRAY_SIZE(priv->mc_maclist))
 381                         break;
 382         }
 383
 384         return 1; /* update */
 385 }
 386
 387 static void p54_configure_filter(struct ieee80211_hw *dev,
 388                                  unsigned int changed_flags,
 389                                  unsigned int *total_flags,
 390                                  u64 multicast)
 391 {
 392         struct p54_common *priv = dev->priv;
 393
 394         *total_flags &= FIF_PROMISC_IN_BSS |
 395                         FIF_ALLMULTI |
 396                         FIF_OTHER_BSS;
 397
 398         priv->filter_flags = *total_flags;
 399
 400         if (changed_flags & (FIF_PROMISC_IN_BSS | FIF_OTHER_BSS))
 401                 p54_setup_mac(priv);
 402
 403         if (changed_flags & FIF_ALLMULTI || multicast)
 404                 p54_set_groupfilter(priv);
 405 }
 406
 407 static int p54_conf_tx(struct ieee80211_hw *dev,
 408                        struct ieee80211_vif *vif, u16 queue,
 409                        const struct ieee80211_tx_queue_params *params)
 410 {
 411         struct p54_common *priv = dev->priv;
 412         int ret;
 413
 414         mutex_lock(&priv->conf_mutex);
 415         if (queue < dev->queues) {
 416                 P54_SET_QUEUE(priv->qos_params[queue], params->aifs,
 417                         params->cw_min, params->cw_max, params->txop);
 418                 ret = p54_set_edcf(priv);
 419         } else
 420                 ret = -EINVAL;
 421         mutex_unlock(&priv->conf_mutex);
 422         return ret;
 423 }
 424
 425 static void p54_work(struct work_struct *work)
 426 {
 427         struct p54_common *priv = container_of(work, struct p54_common,
 428                                                work.work);
 429
 430         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
 431                 return ;
 432
 433         /*
 434          * TODO: walk through tx_queue and do the following tasks
 435          *      1. initiate bursts.
 436          *      2. cancel stuck frames / reset the device if necessary.
 437          */
 438
 439         mutex_lock(&priv->conf_mutex);
 440         WARN_ON_ONCE(p54_fetch_statistics(priv));
 441         mutex_unlock(&priv->conf_mutex);
 442 }
 443
 444 static int p54_get_stats(struct ieee80211_hw *dev,
 445                          struct ieee80211_low_level_stats *stats)
 446 {
 447         struct p54_common *priv = dev->priv;
 448
 449         memcpy(stats, &priv->stats, sizeof(*stats));
 450         return 0;
 451 }
 452
 453 static void p54_bss_info_changed(struct ieee80211_hw *dev,
 454                                  struct ieee80211_vif *vif,
 455                                  struct ieee80211_bss_conf *info,
 456                                  u32 changed)
 457 {
 458         struct p54_common *priv = dev->priv;
 459
 460         mutex_lock(&priv->conf_mutex);
 461         if (changed & BSS_CHANGED_BSSID) {
 462                 memcpy(priv->bssid, info->bssid, ETH_ALEN);
 463                 p54_setup_mac(priv);
 464         }
 465
 466         if (changed & BSS_CHANGED_BEACON) {
 467                 p54_scan(priv, P54_SCAN_EXIT, 0);
 468                 p54_setup_mac(priv);
 469                 p54_beacon_update(priv, vif);
 470                 p54_set_edcf(priv);
 471         }
 472
 473         if (changed & (BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BEACON)) {
 474                 priv->use_short_slot = info->use_short_slot;
 475                 p54_set_edcf(priv);
 476         }
 477         if (changed & BSS_CHANGED_BASIC_RATES) {
 478                 if (dev->conf.channel->band == IEEE80211_BAND_5GHZ)
 479                         priv->basic_rate_mask = (info->basic_rates << 4);
 480                 else
 481                         priv->basic_rate_mask = info->basic_rates;
 482                 p54_setup_mac(priv);
 483                 if (priv->fw_var >= 0x500)
 484                         p54_scan(priv, P54_SCAN_EXIT, 0);
 485         }
 486         if (changed & BSS_CHANGED_ASSOC) {
 487                 if (info->assoc) {
 488                         priv->aid = info->aid;
 489                         priv->wakeup_timer = info->beacon_int *
 490                                              info->dtim_period * 5;
 491                         p54_setup_mac(priv);
 492                 } else {
 493                         priv->wakeup_timer = 500;
 494                         priv->aid = 0;
 495                 }
 496         }
 497
 498         mutex_unlock(&priv->conf_mutex);
 499 }
 500
 501 static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
 502                        struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 503                        struct ieee80211_key_conf *key)
 504 {
 505         struct p54_common *priv = dev->priv;
 506         int slot, ret = 0;
 507         u8 algo = 0;
 508         u8 *addr = NULL;
 509
 510         if (modparam_nohwcrypt)
 511                 return -EOPNOTSUPP;
 512
 513         mutex_lock(&priv->conf_mutex);
 514         if (cmd == SET_KEY) {
 515                 switch (key->cipher) {
 516                 case WLAN_CIPHER_SUITE_TKIP:
 517                         if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL |
 518                               BR_DESC_PRIV_CAP_TKIP))) {
 519                                 ret = -EOPNOTSUPP;
 520                                 goto out_unlock;
 521                         }
 522                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 523                         algo = P54_CRYPTO_TKIPMICHAEL;
 524                         break;
 525                 case WLAN_CIPHER_SUITE_WEP40:
 526                 case WLAN_CIPHER_SUITE_WEP104:
 527                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) {
 528                                 ret = -EOPNOTSUPP;
 529                                 goto out_unlock;
 530                         }
 531                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 532                         algo = P54_CRYPTO_WEP;
 533                         break;
 534                 case WLAN_CIPHER_SUITE_CCMP:
 535                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) {
 536                                 ret = -EOPNOTSUPP;
 537                                 goto out_unlock;
 538                         }
 539                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 540                         algo = P54_CRYPTO_AESCCMP;
 541                         break;
 542                 default:
 543                         ret = -EOPNOTSUPP;
 544                         goto out_unlock;
 545                 }
 546                 slot = bitmap_find_free_region(priv->used_rxkeys,
 547                                                priv->rx_keycache_size, 0);
 548
 549                 if (slot < 0) {
 550                         /*
 551                          * The device supports the chosen algorithm, but the
 552                          * firmware does not provide enough key slots to store
 553                          * all of them.
 554                          * But encryption offload for outgoing frames is always
 555                          * possible, so we just pretend that the upload was
 556                          * successful and do the decryption in software.
 557                          */
 558
 559                         /* mark the key as invalid. */
 560                         key->hw_key_idx = 0xff;
 561                         goto out_unlock;
 562                 }
 563         } else {
 564                 slot = key->hw_key_idx;
 565
 566                 if (slot == 0xff) {
 567                         /* This key was not uploaded into the rx key cache. */
 568
 569                         goto out_unlock;
 570                 }
 571
 572                 bitmap_release_region(priv->used_rxkeys, slot, 0);
 573                 algo = 0;
 574         }
 575
 576         if (sta)
 577                 addr = sta->addr;
 578
 579         ret = p54_upload_key(priv, algo, slot, key->keyidx,
 580                              key->keylen, addr, key->key);
 581         if (ret) {
 582                 bitmap_release_region(priv->used_rxkeys, slot, 0);
 583                 ret = -EOPNOTSUPP;
 584                 goto out_unlock;
 585         }
 586
 587         key->hw_key_idx = slot;
 588
 589 out_unlock:
 590         mutex_unlock(&priv->conf_mutex);
 591         return ret;
 592 }
 593
 594 static int p54_get_survey(struct ieee80211_hw *dev, int idx,
 595                                 struct survey_info *survey)
 596 {
 597         struct p54_common *priv = dev->priv;
 598         struct ieee80211_channel *chan;
 599         int err, tries;
 600         bool in_use = false;
 601
 602         if (idx >= priv->chan_num)
 603                 return -ENOENT;
 604
 605 #define MAX_TRIES 1
 606         for (tries = 0; tries < MAX_TRIES; tries++) {
 607                 chan = priv->curchan;
 608                 if (chan && chan->hw_value == idx) {
 609                         mutex_lock(&priv->conf_mutex);
 610                         err = p54_wait_for_stats(dev);
 611                         mutex_unlock(&priv->conf_mutex);
 612                         if (err)
 613                                 return err;
 614
 615                         in_use = true;
 616                 }
 617
 618                 memcpy(survey, &priv->survey[idx], sizeof(*survey));
 619
 620                 if (in_use) {
 621                         /* test if the reported statistics are valid. */
 622                         if  (survey->channel_time != 0) {
 623                                 survey->filled |= SURVEY_INFO_IN_USE;
 624                         } else {
 625                                 /*
 626                                  * hw/fw has not accumulated enough sample sets.
 627                                  * Wait for 100ms, this ought to be enough to
 628                                  * to get at least one non-null set of channel
 629                                  * usage statistics.
 630                                  */
 631                                 msleep(100);
 632                                 continue;
 633                         }
 634                 }
 635                 return 0;
 636         }
 637         return -ETIMEDOUT;
 638 #undef MAX_TRIES
 639 }
 640
 641 static unsigned int p54_flush_count(struct p54_common *priv)
 642 {
 643         unsigned int total = 0, i;
 644
 645         BUILD_BUG_ON(P54_QUEUE_NUM > ARRAY_SIZE(priv->tx_stats));
 646
 647         /*
 648          * Because the firmware has the sole control over any frames
 649          * in the P54_QUEUE_BEACON or P54_QUEUE_SCAN queues, they
 650          * don't really count as pending or active.
 651          */
 652         for (i = P54_QUEUE_MGMT; i < P54_QUEUE_NUM; i++)
 653                 total += priv->tx_stats[i].len;
 654         return total;
 655 }
 656
 657 static void p54_flush(struct ieee80211_hw *dev, bool drop)
 658 {
 659         struct p54_common *priv = dev->priv;
 660         unsigned int total, i;
 661
 662         /*
 663          * Currently, it wouldn't really matter if we wait for one second
 664          * or 15 minutes. But once someone gets around and completes the
 665          * TODOs [ancel stuck frames / reset device] in p54_work, it will
 666          * suddenly make sense to wait that long.
 667          */
 668         i = P54_STATISTICS_UPDATE * 2 / 20;
 669
 670         /*
 671          * In this case no locking is required because as we speak the
 672          * queues have already been stopped and no new frames can sneak
 673          * up from behind.
 674          */
 675         while ((total = p54_flush_count(priv) && i--)) {
 676                 /* waste time */
 677                 msleep(20);
 678         }
 679
 680         WARN(total, "tx flush timeout, unresponsive firmware");
 681 }
 682
 683 static void p54_set_coverage_class(struct ieee80211_hw *dev, u8 coverage_class)
 684 {
 685         struct p54_common *priv = dev->priv;
 686
 687         mutex_lock(&priv->conf_mutex);
 688         /* support all coverage class values as in 802.11-2007 Table 7-27 */
 689         priv->coverage_class = clamp_t(u8, coverage_class, 0, 31);
 690         p54_set_edcf(priv);
 691         mutex_unlock(&priv->conf_mutex);
 692 }
 693
 694 static const struct ieee80211_ops p54_ops = {
 695         .tx                     = p54_tx_80211,
 696         .start                  = p54_start,
 697         .stop                   = p54_stop,
 698         .add_interface          = p54_add_interface,
 699         .remove_interface       = p54_remove_interface,
 700         .set_tim                = p54_set_tim,
 701         .sta_notify             = p54_sta_notify,
 702         .sta_add                = p54_sta_add_remove,
 703         .sta_remove             = p54_sta_add_remove,
 704         .set_key                = p54_set_key,
 705         .config                 = p54_config,
 706         .flush                  = p54_flush,
 707         .bss_info_changed       = p54_bss_info_changed,
 708         .prepare_multicast      = p54_prepare_multicast,
 709         .configure_filter       = p54_configure_filter,
 710         .conf_tx                = p54_conf_tx,
 711         .get_stats              = p54_get_stats,
 712         .get_survey             = p54_get_survey,
 713         .set_coverage_class     = p54_set_coverage_class,
 714 };
 715
 716 struct ieee80211_hw *p54_init_common(size_t priv_data_len)
 717 {
 718         struct ieee80211_hw *dev;
 719         struct p54_common *priv;
 720
 721         dev = ieee80211_alloc_hw(priv_data_len, &p54_ops);
 722         if (!dev)
 723                 return NULL;
 724
 725         priv = dev->priv;
 726         priv->hw = dev;
 727         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 728         priv->basic_rate_mask = 0x15f;
 729         spin_lock_init(&priv->tx_stats_lock);
 730         skb_queue_head_init(&priv->tx_queue);
 731         skb_queue_head_init(&priv->tx_pending);
 732         dev->flags = IEEE80211_HW_RX_INCLUDES_FCS |
 733                      IEEE80211_HW_SIGNAL_DBM |
 734                      IEEE80211_HW_SUPPORTS_PS |
 735                      IEEE80211_HW_PS_NULLFUNC_STACK |
 736                      IEEE80211_HW_BEACON_FILTER |
 737                      IEEE80211_HW_REPORTS_TX_ACK_STATUS;
 738
 739         dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
 740                                       BIT(NL80211_IFTYPE_ADHOC) |
 741                                       BIT(NL80211_IFTYPE_AP) |
 742                                       BIT(NL80211_IFTYPE_MESH_POINT);
 743
 744         dev->channel_change_time = 1000;        /* TODO: find actual value */
 745         priv->beacon_req_id = cpu_to_le32(0);
 746         priv->tx_stats[P54_QUEUE_BEACON].limit = 1;
 747         priv->tx_stats[P54_QUEUE_FWSCAN].limit = 1;
 748         priv->tx_stats[P54_QUEUE_MGMT].limit = 3;
 749         priv->tx_stats[P54_QUEUE_CAB].limit = 3;
 750         priv->tx_stats[P54_QUEUE_DATA].limit = 5;
 751         dev->queues = 1;
 752         priv->noise = -94;
 753         /*
 754          * We support at most 8 tries no matter which rate they're at,
 755          * we cannot support max_rates * max_rate_tries as we set it
 756          * here, but setting it correctly to 4/2 or so would limit us
 757          * artificially if the RC algorithm wants just two rates, so
 758          * let's say 4/7, we'll redistribute it at TX time, see the
 759          * comments there.
 760          */
 761         dev->max_rates = 4;
 762         dev->max_rate_tries = 7;
 763         dev->extra_tx_headroom = sizeof(struct p54_hdr) + 4 +
 764                                  sizeof(struct p54_tx_data);
 765
 766         /*
 767          * For now, disable PS by default because it affects
 768          * link stability significantly.
 769          */
 770         dev->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
 771
 772         mutex_init(&priv->conf_mutex);
 773         mutex_init(&priv->eeprom_mutex);
 774         init_completion(&priv->stat_comp);
 775         init_completion(&priv->eeprom_comp);
 776         init_completion(&priv->beacon_comp);
 777         INIT_DELAYED_WORK(&priv->work, p54_work);
 778
 779         memset(&priv->mc_maclist[0], ~0, ETH_ALEN);
 780         priv->curchan = NULL;
 781         p54_reset_stats(priv);
 782         return dev;
 783 }
 784 EXPORT_SYMBOL_GPL(p54_init_common);
 785
 786 int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
 787 {
 788         struct p54_common __maybe_unused *priv = dev->priv;
 789         int err;
 790
 791         err = ieee80211_register_hw(dev);
 792         if (err) {
 793                 dev_err(pdev, "Cannot register device (%d).\n", err);
 794                 return err;
 795         }
 796
 797 #ifdef CONFIG_P54_LEDS
 798         err = p54_init_leds(priv);
 799         if (err)
 800                 return err;
 801 #endif /* CONFIG_P54_LEDS */
 802
 803         dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy));
 804         return 0;
 805 }
 806 EXPORT_SYMBOL_GPL(p54_register_common);
 807
 808 void p54_free_common(struct ieee80211_hw *dev)
 809 {
 810         struct p54_common *priv = dev->priv;
 811         unsigned int i;
 812
 813         for (i = 0; i < IEEE80211_NUM_BANDS; i++)
 814                 kfree(priv->band_table[i]);
 815
 816         kfree(priv->iq_autocal);
 817         kfree(priv->output_limit);
 818         kfree(priv->curve_data);
 819         kfree(priv->rssi_db);
 820         kfree(priv->used_rxkeys);
 821         kfree(priv->survey);
 822         priv->iq_autocal = NULL;
 823         priv->output_limit = NULL;
 824         priv->curve_data = NULL;
 825         priv->rssi_db = NULL;
 826         priv->used_rxkeys = NULL;
 827         priv->survey = NULL;
 828         ieee80211_free_hw(dev);
 829 }
 830 EXPORT_SYMBOL_GPL(p54_free_common);
 831
 832 void p54_unregister_common(struct ieee80211_hw *dev)
 833 {
 834         struct p54_common *priv = dev->priv;
 835
 836 #ifdef CONFIG_P54_LEDS
 837         p54_unregister_leds(priv);
 838 #endif /* CONFIG_P54_LEDS */
 839
 840         ieee80211_unregister_hw(dev);
 841         mutex_destroy(&priv->conf_mutex);
 842         mutex_destroy(&priv->eeprom_mutex);
 843 }
 844 EXPORT_SYMBOL_GPL(p54_unregister_common);