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 #include <linux/module.h>
  24
  25 #include <net/mac80211.h>
  26
  27 #include "p54.h"
  28 #include "lmac.h"
  29
  30 static bool modparam_nohwcrypt;
  31 module_param_named(nohwcrypt, modparam_nohwcrypt, bool, S_IRUGO);
  32 MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");
  33 MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
  34 MODULE_DESCRIPTION("Softmac Prism54 common code");
  35 MODULE_LICENSE("GPL");
  36 MODULE_ALIAS("prism54common");
  37
  38 static int p54_sta_add_remove(struct ieee80211_hw *hw,
  39                               struct ieee80211_vif *vif,
  40                               struct ieee80211_sta *sta)
  41 {
  42         struct p54_common *priv = hw->priv;
  43
  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
  51         return 0;
  52 }
  53
  54 static void p54_sta_notify(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
  55                               enum sta_notify_cmd notify_cmd,
  56                               struct ieee80211_sta *sta)
  57 {
  58         struct p54_common *priv = dev->priv;
  59
  60         switch (notify_cmd) {
  61         case STA_NOTIFY_AWAKE:
  62                 /* update the firmware's filter table */
  63                 p54_sta_unlock(priv, sta->addr);
  64                 break;
  65         default:
  66                 break;
  67         }
  68 }
  69
  70 static int p54_set_tim(struct ieee80211_hw *dev, struct ieee80211_sta *sta,
  71                         bool set)
  72 {
  73         struct p54_common *priv = dev->priv;
  74
  75         return p54_update_beacon_tim(priv, sta->aid, set);
  76 }
  77
  78 u8 *p54_find_ie(struct sk_buff *skb, u8 ie)
  79 {
  80         struct ieee80211_mgmt *mgmt = (void *)skb->data;
  81         u8 *pos, *end;
  82
  83         if (skb->len <= sizeof(mgmt))
  84                 return NULL;
  85
  86         pos = (u8 *)mgmt->u.beacon.variable;
  87         end = skb->data + skb->len;
  88         while (pos < end) {
  89                 if (pos + 2 + pos[1] > end)
  90                         return NULL;
  91
  92                 if (pos[0] == ie)
  93                         return pos;
  94
  95                 pos += 2 + pos[1];
  96         }
  97         return NULL;
  98 }
  99
 100 static int p54_beacon_format_ie_tim(struct sk_buff *skb)
 101 {
 102         /*
 103          * the good excuse for this mess is ... the firmware.
 104          * The dummy TIM MUST be at the end of the beacon frame,
 105          * because it'll be overwritten!
 106          */
 107         u8 *tim;
 108         u8 dtim_len;
 109         u8 dtim_period;
 110         u8 *next;
 111
 112         tim = p54_find_ie(skb, WLAN_EID_TIM);
 113         if (!tim)
 114                 return 0;
 115
 116         dtim_len = tim[1];
 117         dtim_period = tim[3];
 118         next = tim + 2 + dtim_len;
 119
 120         if (dtim_len < 3)
 121                 return -EINVAL;
 122
 123         memmove(tim, next, skb_tail_pointer(skb) - next);
 124         tim = skb_tail_pointer(skb) - (dtim_len + 2);
 125
 126         /* add the dummy at the end */
 127         tim[0] = WLAN_EID_TIM;
 128         tim[1] = 3;
 129         tim[2] = 0;
 130         tim[3] = dtim_period;
 131         tim[4] = 0;
 132
 133         if (dtim_len > 3)
 134                 skb_trim(skb, skb->len - (dtim_len - 3));
 135
 136         return 0;
 137 }
 138
 139 static int p54_beacon_update(struct p54_common *priv,
 140                         struct ieee80211_vif *vif)
 141 {
 142         struct sk_buff *beacon;
 143         int ret;
 144
 145         beacon = ieee80211_beacon_get(priv->hw, vif);
 146         if (!beacon)
 147                 return -ENOMEM;
 148         ret = p54_beacon_format_ie_tim(beacon);
 149         if (ret)
 150                 return ret;
 151
 152         /*
 153          * During operation, the firmware takes care of beaconing.
 154          * The driver only needs to upload a new beacon template, once
 155          * the template was changed by the stack or userspace.
 156          *
 157          * LMAC API 3.2.2 also specifies that the driver does not need
 158          * to cancel the old beacon template by hand, instead the firmware
 159          * will release the previous one through the feedback mechanism.
 160          */
 161         p54_tx_80211(priv->hw, beacon);
 162         priv->tsf_high32 = 0;
 163         priv->tsf_low32 = 0;
 164
 165         return 0;
 166 }
 167
 168 static int p54_start(struct ieee80211_hw *dev)
 169 {
 170         struct p54_common *priv = dev->priv;
 171         int err;
 172
 173         mutex_lock(&priv->conf_mutex);
 174         err = priv->open(dev);
 175         if (err)
 176                 goto out;
 177         P54_SET_QUEUE(priv->qos_params[0], 0x0002, 0x0003, 0x0007, 47);
 178         P54_SET_QUEUE(priv->qos_params[1], 0x0002, 0x0007, 0x000f, 94);
 179         P54_SET_QUEUE(priv->qos_params[2], 0x0003, 0x000f, 0x03ff, 0);
 180         P54_SET_QUEUE(priv->qos_params[3], 0x0007, 0x000f, 0x03ff, 0);
 181         err = p54_set_edcf(priv);
 182         if (err)
 183                 goto out;
 184
 185         memset(priv->bssid, ~0, ETH_ALEN);
 186         priv->mode = NL80211_IFTYPE_MONITOR;
 187         err = p54_setup_mac(priv);
 188         if (err) {
 189                 priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 190                 goto out;
 191         }
 192
 193         ieee80211_queue_delayed_work(dev, &priv->work, 0);
 194
 195         priv->softled_state = 0;
 196         err = p54_set_leds(priv);
 197
 198 out:
 199         mutex_unlock(&priv->conf_mutex);
 200         return err;
 201 }
 202
 203 static void p54_stop(struct ieee80211_hw *dev)
 204 {
 205         struct p54_common *priv = dev->priv;
 206         int i;
 207
 208         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 209         priv->softled_state = 0;
 210         cancel_delayed_work_sync(&priv->work);
 211         mutex_lock(&priv->conf_mutex);
 212         p54_set_leds(priv);
 213         priv->stop(dev);
 214         skb_queue_purge(&priv->tx_pending);
 215         skb_queue_purge(&priv->tx_queue);
 216         for (i = 0; i < P54_QUEUE_NUM; i++) {
 217                 priv->tx_stats[i].count = 0;
 218                 priv->tx_stats[i].len = 0;
 219         }
 220
 221         priv->beacon_req_id = cpu_to_le32(0);
 222         priv->tsf_high32 = priv->tsf_low32 = 0;
 223         mutex_unlock(&priv->conf_mutex);
 224 }
 225
 226 static int p54_add_interface(struct ieee80211_hw *dev,
 227                              struct ieee80211_vif *vif)
 228 {
 229         struct p54_common *priv = dev->priv;
 230
 231         vif->driver_flags |= IEEE80211_VIF_BEACON_FILTER;
 232
 233         mutex_lock(&priv->conf_mutex);
 234         if (priv->mode != NL80211_IFTYPE_MONITOR) {
 235                 mutex_unlock(&priv->conf_mutex);
 236                 return -EOPNOTSUPP;
 237         }
 238
 239         priv->vif = vif;
 240
 241         switch (vif->type) {
 242         case NL80211_IFTYPE_STATION:
 243         case NL80211_IFTYPE_ADHOC:
 244         case NL80211_IFTYPE_AP:
 245         case NL80211_IFTYPE_MESH_POINT:
 246                 priv->mode = vif->type;
 247                 break;
 248         default:
 249                 mutex_unlock(&priv->conf_mutex);
 250                 return -EOPNOTSUPP;
 251         }
 252
 253         memcpy(priv->mac_addr, vif->addr, ETH_ALEN);
 254         p54_setup_mac(priv);
 255         mutex_unlock(&priv->conf_mutex);
 256         return 0;
 257 }
 258
 259 static void p54_remove_interface(struct ieee80211_hw *dev,
 260                                  struct ieee80211_vif *vif)
 261 {
 262         struct p54_common *priv = dev->priv;
 263
 264         mutex_lock(&priv->conf_mutex);
 265         priv->vif = NULL;
 266
 267         /*
 268          * LMAC API 3.2.2 states that any active beacon template must be
 269          * canceled by the driver before attempting a mode transition.
 270          */
 271         if (le32_to_cpu(priv->beacon_req_id) != 0) {
 272                 p54_tx_cancel(priv, priv->beacon_req_id);
 273                 wait_for_completion_interruptible_timeout(&priv->beacon_comp, HZ);
 274         }
 275         priv->mode = NL80211_IFTYPE_MONITOR;
 276         memset(priv->mac_addr, 0, ETH_ALEN);
 277         memset(priv->bssid, 0, ETH_ALEN);
 278         p54_setup_mac(priv);
 279         mutex_unlock(&priv->conf_mutex);
 280 }
 281
 282 static int p54_wait_for_stats(struct ieee80211_hw *dev)
 283 {
 284         struct p54_common *priv = dev->priv;
 285         int ret;
 286
 287         priv->update_stats = true;
 288         ret = p54_fetch_statistics(priv);
 289         if (ret)
 290                 return ret;
 291
 292         ret = wait_for_completion_interruptible_timeout(&priv->stat_comp, HZ);
 293         if (ret == 0)
 294                 return -ETIMEDOUT;
 295
 296         return 0;
 297 }
 298
 299 static void p54_reset_stats(struct p54_common *priv)
 300 {
 301         struct ieee80211_channel *chan = priv->curchan;
 302
 303         if (chan) {
 304                 struct survey_info *info = &priv->survey[chan->hw_value];
 305
 306                 /* only reset channel statistics, don't touch .filled, etc. */
 307                 info->channel_time = 0;
 308                 info->channel_time_busy = 0;
 309                 info->channel_time_tx = 0;
 310         }
 311
 312         priv->update_stats = true;
 313         priv->survey_raw.active = 0;
 314         priv->survey_raw.cca = 0;
 315         priv->survey_raw.tx = 0;
 316 }
 317
 318 static int p54_config(struct ieee80211_hw *dev, u32 changed)
 319 {
 320         int ret = 0;
 321         struct p54_common *priv = dev->priv;
 322         struct ieee80211_conf *conf = &dev->conf;
 323
 324         mutex_lock(&priv->conf_mutex);
 325         if (changed & IEEE80211_CONF_CHANGE_POWER)
 326                 priv->output_power = conf->power_level << 2;
 327         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 328                 struct ieee80211_channel *oldchan;
 329                 WARN_ON(p54_wait_for_stats(dev));
 330                 oldchan = priv->curchan;
 331                 priv->curchan = NULL;
 332                 ret = p54_scan(priv, P54_SCAN_EXIT, 0);
 333                 if (ret) {
 334                         priv->curchan = oldchan;
 335                         goto out;
 336                 }
 337                 /*
 338                  * TODO: Use the LM_SCAN_TRAP to determine the current
 339                  * operating channel.
 340                  */
 341                 priv->curchan = priv->hw->conf.channel;
 342                 p54_reset_stats(priv);
 343                 WARN_ON(p54_fetch_statistics(priv));
 344         }
 345         if (changed & IEEE80211_CONF_CHANGE_PS) {
 346                 WARN_ON(p54_wait_for_stats(dev));
 347                 ret = p54_set_ps(priv);
 348                 if (ret)
 349                         goto out;
 350                 WARN_ON(p54_wait_for_stats(dev));
 351         }
 352         if (changed & IEEE80211_CONF_CHANGE_IDLE) {
 353                 WARN_ON(p54_wait_for_stats(dev));
 354                 ret = p54_setup_mac(priv);
 355                 if (ret)
 356                         goto out;
 357                 WARN_ON(p54_wait_for_stats(dev));
 358         }
 359
 360 out:
 361         mutex_unlock(&priv->conf_mutex);
 362         return ret;
 363 }
 364
 365 static u64 p54_prepare_multicast(struct ieee80211_hw *dev,
 366                                  struct netdev_hw_addr_list *mc_list)
 367 {
 368         struct p54_common *priv = dev->priv;
 369         struct netdev_hw_addr *ha;
 370         int i;
 371
 372         BUILD_BUG_ON(ARRAY_SIZE(priv->mc_maclist) !=
 373                 ARRAY_SIZE(((struct p54_group_address_table *)NULL)->mac_list));
 374         /*
 375          * The first entry is reserved for the global broadcast MAC.
 376          * Otherwise the firmware will drop it and ARP will no longer work.
 377          */
 378         i = 1;
 379         priv->mc_maclist_num = netdev_hw_addr_list_count(mc_list) + i;
 380         netdev_hw_addr_list_for_each(ha, mc_list) {
 381                 memcpy(&priv->mc_maclist[i], ha->addr, ETH_ALEN);
 382                 i++;
 383                 if (i >= ARRAY_SIZE(priv->mc_maclist))
 384                         break;
 385         }
 386
 387         return 1; /* update */
 388 }
 389
 390 static void p54_configure_filter(struct ieee80211_hw *dev,
 391                                  unsigned int changed_flags,
 392                                  unsigned int *total_flags,
 393                                  u64 multicast)
 394 {
 395         struct p54_common *priv = dev->priv;
 396
 397         *total_flags &= FIF_PROMISC_IN_BSS |
 398                         FIF_ALLMULTI |
 399                         FIF_OTHER_BSS;
 400
 401         priv->filter_flags = *total_flags;
 402
 403         if (changed_flags & (FIF_PROMISC_IN_BSS | FIF_OTHER_BSS))
 404                 p54_setup_mac(priv);
 405
 406         if (changed_flags & FIF_ALLMULTI || multicast)
 407                 p54_set_groupfilter(priv);
 408 }
 409
 410 static int p54_conf_tx(struct ieee80211_hw *dev,
 411                        struct ieee80211_vif *vif, u16 queue,
 412                        const struct ieee80211_tx_queue_params *params)
 413 {
 414         struct p54_common *priv = dev->priv;
 415         int ret;
 416
 417         mutex_lock(&priv->conf_mutex);
 418         if (queue < dev->queues) {
 419                 P54_SET_QUEUE(priv->qos_params[queue], params->aifs,
 420                         params->cw_min, params->cw_max, params->txop);
 421                 ret = p54_set_edcf(priv);
 422         } else
 423                 ret = -EINVAL;
 424         mutex_unlock(&priv->conf_mutex);
 425         return ret;
 426 }
 427
 428 static void p54_work(struct work_struct *work)
 429 {
 430         struct p54_common *priv = container_of(work, struct p54_common,
 431                                                work.work);
 432
 433         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
 434                 return ;
 435
 436         /*
 437          * TODO: walk through tx_queue and do the following tasks
 438          *      1. initiate bursts.
 439          *      2. cancel stuck frames / reset the device if necessary.
 440          */
 441
 442         mutex_lock(&priv->conf_mutex);
 443         WARN_ON_ONCE(p54_fetch_statistics(priv));
 444         mutex_unlock(&priv->conf_mutex);
 445 }
 446
 447 static int p54_get_stats(struct ieee80211_hw *dev,
 448                          struct ieee80211_low_level_stats *stats)
 449 {
 450         struct p54_common *priv = dev->priv;
 451
 452         memcpy(stats, &priv->stats, sizeof(*stats));
 453         return 0;
 454 }
 455
 456 static void p54_bss_info_changed(struct ieee80211_hw *dev,
 457                                  struct ieee80211_vif *vif,
 458                                  struct ieee80211_bss_conf *info,
 459                                  u32 changed)
 460 {
 461         struct p54_common *priv = dev->priv;
 462
 463         mutex_lock(&priv->conf_mutex);
 464         if (changed & BSS_CHANGED_BSSID) {
 465                 memcpy(priv->bssid, info->bssid, ETH_ALEN);
 466                 p54_setup_mac(priv);
 467         }
 468
 469         if (changed & BSS_CHANGED_BEACON) {
 470                 p54_scan(priv, P54_SCAN_EXIT, 0);
 471                 p54_setup_mac(priv);
 472                 p54_beacon_update(priv, vif);
 473                 p54_set_edcf(priv);
 474         }
 475
 476         if (changed & (BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BEACON)) {
 477                 priv->use_short_slot = info->use_short_slot;
 478                 p54_set_edcf(priv);
 479         }
 480         if (changed & BSS_CHANGED_BASIC_RATES) {
 481                 if (dev->conf.channel->band == IEEE80211_BAND_5GHZ)
 482                         priv->basic_rate_mask = (info->basic_rates << 4);
 483                 else
 484                         priv->basic_rate_mask = info->basic_rates;
 485                 p54_setup_mac(priv);
 486                 if (priv->fw_var >= 0x500)
 487                         p54_scan(priv, P54_SCAN_EXIT, 0);
 488         }
 489         if (changed & BSS_CHANGED_ASSOC) {
 490                 if (info->assoc) {
 491                         priv->aid = info->aid;
 492                         priv->wakeup_timer = info->beacon_int *
 493                                              info->dtim_period * 5;
 494                         p54_setup_mac(priv);
 495                 } else {
 496                         priv->wakeup_timer = 500;
 497                         priv->aid = 0;
 498                 }
 499         }
 500
 501         mutex_unlock(&priv->conf_mutex);
 502 }
 503
 504 static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
 505                        struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 506                        struct ieee80211_key_conf *key)
 507 {
 508         struct p54_common *priv = dev->priv;
 509         int slot, ret = 0;
 510         u8 algo = 0;
 511         u8 *addr = NULL;
 512
 513         if (modparam_nohwcrypt)
 514                 return -EOPNOTSUPP;
 515
 516         mutex_lock(&priv->conf_mutex);
 517         if (cmd == SET_KEY) {
 518                 switch (key->cipher) {
 519                 case WLAN_CIPHER_SUITE_TKIP:
 520                         if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL |
 521                               BR_DESC_PRIV_CAP_TKIP))) {
 522                                 ret = -EOPNOTSUPP;
 523                                 goto out_unlock;
 524                         }
 525                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 526                         algo = P54_CRYPTO_TKIPMICHAEL;
 527                         break;
 528                 case WLAN_CIPHER_SUITE_WEP40:
 529                 case WLAN_CIPHER_SUITE_WEP104:
 530                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) {
 531                                 ret = -EOPNOTSUPP;
 532                                 goto out_unlock;
 533                         }
 534                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 535                         algo = P54_CRYPTO_WEP;
 536                         break;
 537                 case WLAN_CIPHER_SUITE_CCMP:
 538                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) {
 539                                 ret = -EOPNOTSUPP;
 540                                 goto out_unlock;
 541                         }
 542                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 543                         algo = P54_CRYPTO_AESCCMP;
 544                         break;
 545                 default:
 546                         ret = -EOPNOTSUPP;
 547                         goto out_unlock;
 548                 }
 549                 slot = bitmap_find_free_region(priv->used_rxkeys,
 550                                                priv->rx_keycache_size, 0);
 551
 552                 if (slot < 0) {
 553                         /*
 554                          * The device supports the chosen algorithm, but the
 555                          * firmware does not provide enough key slots to store
 556                          * all of them.
 557                          * But encryption offload for outgoing frames is always
 558                          * possible, so we just pretend that the upload was
 559                          * successful and do the decryption in software.
 560                          */
 561
 562                         /* mark the key as invalid. */
 563                         key->hw_key_idx = 0xff;
 564                         goto out_unlock;
 565                 }
 566         } else {
 567                 slot = key->hw_key_idx;
 568
 569                 if (slot == 0xff) {
 570                         /* This key was not uploaded into the rx key cache. */
 571
 572                         goto out_unlock;
 573                 }
 574
 575                 bitmap_release_region(priv->used_rxkeys, slot, 0);
 576                 algo = 0;
 577         }
 578
 579         if (sta)
 580                 addr = sta->addr;
 581
 582         ret = p54_upload_key(priv, algo, slot, key->keyidx,
 583                              key->keylen, addr, key->key);
 584         if (ret) {
 585                 bitmap_release_region(priv->used_rxkeys, slot, 0);
 586                 ret = -EOPNOTSUPP;
 587                 goto out_unlock;
 588         }
 589
 590         key->hw_key_idx = slot;
 591
 592 out_unlock:
 593         mutex_unlock(&priv->conf_mutex);
 594         return ret;
 595 }
 596
 597 static int p54_get_survey(struct ieee80211_hw *dev, int idx,
 598                                 struct survey_info *survey)
 599 {
 600         struct p54_common *priv = dev->priv;
 601         struct ieee80211_channel *chan;
 602         int err, tries;
 603         bool in_use = false;
 604
 605         if (idx >= priv->chan_num)
 606                 return -ENOENT;
 607
 608 #define MAX_TRIES 1
 609         for (tries = 0; tries < MAX_TRIES; tries++) {
 610                 chan = priv->curchan;
 611                 if (chan && chan->hw_value == idx) {
 612                         mutex_lock(&priv->conf_mutex);
 613                         err = p54_wait_for_stats(dev);
 614                         mutex_unlock(&priv->conf_mutex);
 615                         if (err)
 616                                 return err;
 617
 618                         in_use = true;
 619                 }
 620
 621                 memcpy(survey, &priv->survey[idx], sizeof(*survey));
 622
 623                 if (in_use) {
 624                         /* test if the reported statistics are valid. */
 625                         if  (survey->channel_time != 0) {
 626                                 survey->filled |= SURVEY_INFO_IN_USE;
 627                         } else {
 628                                 /*
 629                                  * hw/fw has not accumulated enough sample sets.
 630                                  * Wait for 100ms, this ought to be enough to
 631                                  * to get at least one non-null set of channel
 632                                  * usage statistics.
 633                                  */
 634                                 msleep(100);
 635                                 continue;
 636                         }
 637                 }
 638                 return 0;
 639         }
 640         return -ETIMEDOUT;
 641 #undef MAX_TRIES
 642 }
 643
 644 static unsigned int p54_flush_count(struct p54_common *priv)
 645 {
 646         unsigned int total = 0, i;
 647
 648         BUILD_BUG_ON(P54_QUEUE_NUM > ARRAY_SIZE(priv->tx_stats));
 649
 650         /*
 651          * Because the firmware has the sole control over any frames
 652          * in the P54_QUEUE_BEACON or P54_QUEUE_SCAN queues, they
 653          * don't really count as pending or active.
 654          */
 655         for (i = P54_QUEUE_MGMT; i < P54_QUEUE_NUM; i++)
 656                 total += priv->tx_stats[i].len;
 657         return total;
 658 }
 659
 660 static void p54_flush(struct ieee80211_hw *dev, bool drop)
 661 {
 662         struct p54_common *priv = dev->priv;
 663         unsigned int total, i;
 664
 665         /*
 666          * Currently, it wouldn't really matter if we wait for one second
 667          * or 15 minutes. But once someone gets around and completes the
 668          * TODOs [ancel stuck frames / reset device] in p54_work, it will
 669          * suddenly make sense to wait that long.
 670          */
 671         i = P54_STATISTICS_UPDATE * 2 / 20;
 672
 673         /*
 674          * In this case no locking is required because as we speak the
 675          * queues have already been stopped and no new frames can sneak
 676          * up from behind.
 677          */
 678         while ((total = p54_flush_count(priv) && i--)) {
 679                 /* waste time */
 680                 msleep(20);
 681         }
 682
 683         WARN(total, "tx flush timeout, unresponsive firmware");
 684 }
 685
 686 static void p54_set_coverage_class(struct ieee80211_hw *dev, u8 coverage_class)
 687 {
 688         struct p54_common *priv = dev->priv;
 689
 690         mutex_lock(&priv->conf_mutex);
 691         /* support all coverage class values as in 802.11-2007 Table 7-27 */
 692         priv->coverage_class = clamp_t(u8, coverage_class, 0, 31);
 693         p54_set_edcf(priv);
 694         mutex_unlock(&priv->conf_mutex);
 695 }
 696
 697 static const struct ieee80211_ops p54_ops = {
 698         .tx                     = p54_tx_80211,
 699         .start                  = p54_start,
 700         .stop                   = p54_stop,
 701         .add_interface          = p54_add_interface,
 702         .remove_interface       = p54_remove_interface,
 703         .set_tim                = p54_set_tim,
 704         .sta_notify             = p54_sta_notify,
 705         .sta_add                = p54_sta_add_remove,
 706         .sta_remove             = p54_sta_add_remove,
 707         .set_key                = p54_set_key,
 708         .config                 = p54_config,
 709         .flush                  = p54_flush,
 710         .bss_info_changed       = p54_bss_info_changed,
 711         .prepare_multicast      = p54_prepare_multicast,
 712         .configure_filter       = p54_configure_filter,
 713         .conf_tx                = p54_conf_tx,
 714         .get_stats              = p54_get_stats,
 715         .get_survey             = p54_get_survey,
 716         .set_coverage_class     = p54_set_coverage_class,
 717 };
 718
 719 struct ieee80211_hw *p54_init_common(size_t priv_data_len)
 720 {
 721         struct ieee80211_hw *dev;
 722         struct p54_common *priv;
 723
 724         dev = ieee80211_alloc_hw(priv_data_len, &p54_ops);
 725         if (!dev)
 726                 return NULL;
 727
 728         priv = dev->priv;
 729         priv->hw = dev;
 730         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 731         priv->basic_rate_mask = 0x15f;
 732         spin_lock_init(&priv->tx_stats_lock);
 733         skb_queue_head_init(&priv->tx_queue);
 734         skb_queue_head_init(&priv->tx_pending);
 735         dev->flags = IEEE80211_HW_RX_INCLUDES_FCS |
 736                      IEEE80211_HW_SIGNAL_DBM |
 737                      IEEE80211_HW_SUPPORTS_PS |
 738                      IEEE80211_HW_PS_NULLFUNC_STACK |
 739                      IEEE80211_HW_REPORTS_TX_ACK_STATUS;
 740
 741         dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
 742                                       BIT(NL80211_IFTYPE_ADHOC) |
 743                                       BIT(NL80211_IFTYPE_AP) |
 744                                       BIT(NL80211_IFTYPE_MESH_POINT);
 745
 746         dev->channel_change_time = 1000;        /* TODO: find actual value */
 747         priv->beacon_req_id = cpu_to_le32(0);
 748         priv->tx_stats[P54_QUEUE_BEACON].limit = 1;
 749         priv->tx_stats[P54_QUEUE_FWSCAN].limit = 1;
 750         priv->tx_stats[P54_QUEUE_MGMT].limit = 3;
 751         priv->tx_stats[P54_QUEUE_CAB].limit = 3;
 752         priv->tx_stats[P54_QUEUE_DATA].limit = 5;
 753         dev->queues = 1;
 754         priv->noise = -94;
 755         /*
 756          * We support at most 8 tries no matter which rate they're at,
 757          * we cannot support max_rates * max_rate_tries as we set it
 758          * here, but setting it correctly to 4/2 or so would limit us
 759          * artificially if the RC algorithm wants just two rates, so
 760          * let's say 4/7, we'll redistribute it at TX time, see the
 761          * comments there.
 762          */
 763         dev->max_rates = 4;
 764         dev->max_rate_tries = 7;
 765         dev->extra_tx_headroom = sizeof(struct p54_hdr) + 4 +
 766                                  sizeof(struct p54_tx_data);
 767
 768         /*
 769          * For now, disable PS by default because it affects
 770          * link stability significantly.
 771          */
 772         dev->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
 773
 774         mutex_init(&priv->conf_mutex);
 775         mutex_init(&priv->eeprom_mutex);
 776         init_completion(&priv->stat_comp);
 777         init_completion(&priv->eeprom_comp);
 778         init_completion(&priv->beacon_comp);
 779         INIT_DELAYED_WORK(&priv->work, p54_work);
 780
 781         memset(&priv->mc_maclist[0], ~0, ETH_ALEN);
 782         priv->curchan = NULL;
 783         p54_reset_stats(priv);
 784         return dev;
 785 }
 786 EXPORT_SYMBOL_GPL(p54_init_common);
 787
 788 int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
 789 {
 790         struct p54_common __maybe_unused *priv = dev->priv;
 791         int err;
 792
 793         err = ieee80211_register_hw(dev);
 794         if (err) {
 795                 dev_err(pdev, "Cannot register device (%d).\n", err);
 796                 return err;
 797         }
 798
 799 #ifdef CONFIG_P54_LEDS
 800         err = p54_init_leds(priv);
 801         if (err)
 802                 return err;
 803 #endif /* CONFIG_P54_LEDS */
 804
 805         dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy));
 806         return 0;
 807 }
 808 EXPORT_SYMBOL_GPL(p54_register_common);
 809
 810 void p54_free_common(struct ieee80211_hw *dev)
 811 {
 812         struct p54_common *priv = dev->priv;
 813         unsigned int i;
 814
 815         for (i = 0; i < IEEE80211_NUM_BANDS; i++)
 816                 kfree(priv->band_table[i]);
 817
 818         kfree(priv->iq_autocal);
 819         kfree(priv->output_limit);
 820         kfree(priv->curve_data);
 821         kfree(priv->rssi_db);
 822         kfree(priv->used_rxkeys);
 823         kfree(priv->survey);
 824         priv->iq_autocal = NULL;
 825         priv->output_limit = NULL;
 826         priv->curve_data = NULL;
 827         priv->rssi_db = NULL;
 828         priv->used_rxkeys = NULL;
 829         priv->survey = NULL;
 830         ieee80211_free_hw(dev);
 831 }
 832 EXPORT_SYMBOL_GPL(p54_free_common);
 833
 834 void p54_unregister_common(struct ieee80211_hw *dev)
 835 {
 836         struct p54_common *priv = dev->priv;
 837
 838 #ifdef CONFIG_P54_LEDS
 839         p54_unregister_leds(priv);
 840 #endif /* CONFIG_P54_LEDS */
 841
 842         ieee80211_unregister_hw(dev);
 843         mutex_destroy(&priv->conf_mutex);
 844         mutex_destroy(&priv->eeprom_mutex);
 845 }
 846 EXPORT_SYMBOL_GPL(p54_unregister_common);