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 ieee80211_tx_control control = { };
 143         struct sk_buff *beacon;
 144         int ret;
 145
 146         beacon = ieee80211_beacon_get(priv->hw, vif);
 147         if (!beacon)
 148                 return -ENOMEM;
 149         ret = p54_beacon_format_ie_tim(beacon);
 150         if (ret)
 151                 return ret;
 152
 153         /*
 154          * During operation, the firmware takes care of beaconing.
 155          * The driver only needs to upload a new beacon template, once
 156          * the template was changed by the stack or userspace.
 157          *
 158          * LMAC API 3.2.2 also specifies that the driver does not need
 159          * to cancel the old beacon template by hand, instead the firmware
 160          * will release the previous one through the feedback mechanism.
 161          */
 162         p54_tx_80211(priv->hw, &control, beacon);
 163         priv->tsf_high32 = 0;
 164         priv->tsf_low32 = 0;
 165
 166         return 0;
 167 }
 168
 169 static int p54_start(struct ieee80211_hw *dev)
 170 {
 171         struct p54_common *priv = dev->priv;
 172         int err;
 173
 174         mutex_lock(&priv->conf_mutex);
 175         err = priv->open(dev);
 176         if (err)
 177                 goto out;
 178         P54_SET_QUEUE(priv->qos_params[0], 0x0002, 0x0003, 0x0007, 47);
 179         P54_SET_QUEUE(priv->qos_params[1], 0x0002, 0x0007, 0x000f, 94);
 180         P54_SET_QUEUE(priv->qos_params[2], 0x0003, 0x000f, 0x03ff, 0);
 181         P54_SET_QUEUE(priv->qos_params[3], 0x0007, 0x000f, 0x03ff, 0);
 182         err = p54_set_edcf(priv);
 183         if (err)
 184                 goto out;
 185
 186         memset(priv->bssid, ~0, ETH_ALEN);
 187         priv->mode = NL80211_IFTYPE_MONITOR;
 188         err = p54_setup_mac(priv);
 189         if (err) {
 190                 priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 191                 goto out;
 192         }
 193
 194         ieee80211_queue_delayed_work(dev, &priv->work, 0);
 195
 196         priv->softled_state = 0;
 197         err = p54_set_leds(priv);
 198
 199 out:
 200         mutex_unlock(&priv->conf_mutex);
 201         return err;
 202 }
 203
 204 static void p54_stop(struct ieee80211_hw *dev)
 205 {
 206         struct p54_common *priv = dev->priv;
 207         int i;
 208
 209         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 210         priv->softled_state = 0;
 211         cancel_delayed_work_sync(&priv->work);
 212         mutex_lock(&priv->conf_mutex);
 213         p54_set_leds(priv);
 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         int err;
 232
 233         vif->driver_flags |= IEEE80211_VIF_BEACON_FILTER;
 234
 235         mutex_lock(&priv->conf_mutex);
 236         if (priv->mode != NL80211_IFTYPE_MONITOR) {
 237                 mutex_unlock(&priv->conf_mutex);
 238                 return -EOPNOTSUPP;
 239         }
 240
 241         priv->vif = vif;
 242
 243         switch (vif->type) {
 244         case NL80211_IFTYPE_STATION:
 245         case NL80211_IFTYPE_ADHOC:
 246         case NL80211_IFTYPE_AP:
 247         case NL80211_IFTYPE_MESH_POINT:
 248                 priv->mode = vif->type;
 249                 break;
 250         default:
 251                 mutex_unlock(&priv->conf_mutex);
 252                 return -EOPNOTSUPP;
 253         }
 254
 255         memcpy(priv->mac_addr, vif->addr, ETH_ALEN);
 256         err = p54_setup_mac(priv);
 257         mutex_unlock(&priv->conf_mutex);
 258         return err;
 259 }
 260
 261 static void p54_remove_interface(struct ieee80211_hw *dev,
 262                                  struct ieee80211_vif *vif)
 263 {
 264         struct p54_common *priv = dev->priv;
 265
 266         mutex_lock(&priv->conf_mutex);
 267         priv->vif = NULL;
 268
 269         /*
 270          * LMAC API 3.2.2 states that any active beacon template must be
 271          * canceled by the driver before attempting a mode transition.
 272          */
 273         if (le32_to_cpu(priv->beacon_req_id) != 0) {
 274                 p54_tx_cancel(priv, priv->beacon_req_id);
 275                 wait_for_completion_interruptible_timeout(&priv->beacon_comp, HZ);
 276         }
 277         priv->mode = NL80211_IFTYPE_MONITOR;
 278         memset(priv->mac_addr, 0, ETH_ALEN);
 279         memset(priv->bssid, 0, ETH_ALEN);
 280         p54_setup_mac(priv);
 281         mutex_unlock(&priv->conf_mutex);
 282 }
 283
 284 static int p54_wait_for_stats(struct ieee80211_hw *dev)
 285 {
 286         struct p54_common *priv = dev->priv;
 287         int ret;
 288
 289         priv->update_stats = true;
 290         ret = p54_fetch_statistics(priv);
 291         if (ret)
 292                 return ret;
 293
 294         ret = wait_for_completion_interruptible_timeout(&priv->stat_comp, HZ);
 295         if (ret == 0)
 296                 return -ETIMEDOUT;
 297
 298         return 0;
 299 }
 300
 301 static void p54_reset_stats(struct p54_common *priv)
 302 {
 303         struct ieee80211_channel *chan = priv->curchan;
 304
 305         if (chan) {
 306                 struct survey_info *info = &priv->survey[chan->hw_value];
 307
 308                 /* only reset channel statistics, don't touch .filled, etc. */
 309                 info->channel_time = 0;
 310                 info->channel_time_busy = 0;
 311                 info->channel_time_tx = 0;
 312         }
 313
 314         priv->update_stats = true;
 315         priv->survey_raw.active = 0;
 316         priv->survey_raw.cca = 0;
 317         priv->survey_raw.tx = 0;
 318 }
 319
 320 static int p54_config(struct ieee80211_hw *dev, u32 changed)
 321 {
 322         int ret = 0;
 323         struct p54_common *priv = dev->priv;
 324         struct ieee80211_conf *conf = &dev->conf;
 325
 326         mutex_lock(&priv->conf_mutex);
 327         if (changed & IEEE80211_CONF_CHANGE_POWER)
 328                 priv->output_power = conf->power_level << 2;
 329         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 330                 struct ieee80211_channel *oldchan;
 331                 WARN_ON(p54_wait_for_stats(dev));
 332                 oldchan = priv->curchan;
 333                 priv->curchan = NULL;
 334                 ret = p54_scan(priv, P54_SCAN_EXIT, 0);
 335                 if (ret) {
 336                         priv->curchan = oldchan;
 337                         goto out;
 338                 }
 339                 /*
 340                  * TODO: Use the LM_SCAN_TRAP to determine the current
 341                  * operating channel.
 342                  */
 343                 priv->curchan = priv->hw->conf.chandef.chan;
 344                 p54_reset_stats(priv);
 345                 WARN_ON(p54_fetch_statistics(priv));
 346         }
 347         if (changed & IEEE80211_CONF_CHANGE_PS) {
 348                 WARN_ON(p54_wait_for_stats(dev));
 349                 ret = p54_set_ps(priv);
 350                 if (ret)
 351                         goto out;
 352                 WARN_ON(p54_wait_for_stats(dev));
 353         }
 354         if (changed & IEEE80211_CONF_CHANGE_IDLE) {
 355                 WARN_ON(p54_wait_for_stats(dev));
 356                 ret = p54_setup_mac(priv);
 357                 if (ret)
 358                         goto out;
 359                 WARN_ON(p54_wait_for_stats(dev));
 360         }
 361
 362 out:
 363         mutex_unlock(&priv->conf_mutex);
 364         return ret;
 365 }
 366
 367 static u64 p54_prepare_multicast(struct ieee80211_hw *dev,
 368                                  struct netdev_hw_addr_list *mc_list)
 369 {
 370         struct p54_common *priv = dev->priv;
 371         struct netdev_hw_addr *ha;
 372         int i;
 373
 374         BUILD_BUG_ON(ARRAY_SIZE(priv->mc_maclist) !=
 375                 ARRAY_SIZE(((struct p54_group_address_table *)NULL)->mac_list));
 376         /*
 377          * The first entry is reserved for the global broadcast MAC.
 378          * Otherwise the firmware will drop it and ARP will no longer work.
 379          */
 380         i = 1;
 381         priv->mc_maclist_num = netdev_hw_addr_list_count(mc_list) + i;
 382         netdev_hw_addr_list_for_each(ha, mc_list) {
 383                 memcpy(&priv->mc_maclist[i], ha->addr, ETH_ALEN);
 384                 i++;
 385                 if (i >= ARRAY_SIZE(priv->mc_maclist))
 386                         break;
 387         }
 388
 389         return 1; /* update */
 390 }
 391
 392 static void p54_configure_filter(struct ieee80211_hw *dev,
 393                                  unsigned int changed_flags,
 394                                  unsigned int *total_flags,
 395                                  u64 multicast)
 396 {
 397         struct p54_common *priv = dev->priv;
 398
 399         *total_flags &= FIF_PROMISC_IN_BSS |
 400                         FIF_ALLMULTI |
 401                         FIF_OTHER_BSS;
 402
 403         priv->filter_flags = *total_flags;
 404
 405         if (changed_flags & (FIF_PROMISC_IN_BSS | FIF_OTHER_BSS))
 406                 p54_setup_mac(priv);
 407
 408         if (changed_flags & FIF_ALLMULTI || multicast)
 409                 p54_set_groupfilter(priv);
 410 }
 411
 412 static int p54_conf_tx(struct ieee80211_hw *dev,
 413                        struct ieee80211_vif *vif, u16 queue,
 414                        const struct ieee80211_tx_queue_params *params)
 415 {
 416         struct p54_common *priv = dev->priv;
 417         int ret;
 418
 419         mutex_lock(&priv->conf_mutex);
 420         if (queue < dev->queues) {
 421                 P54_SET_QUEUE(priv->qos_params[queue], params->aifs,
 422                         params->cw_min, params->cw_max, params->txop);
 423                 ret = p54_set_edcf(priv);
 424         } else
 425                 ret = -EINVAL;
 426         mutex_unlock(&priv->conf_mutex);
 427         return ret;
 428 }
 429
 430 static void p54_work(struct work_struct *work)
 431 {
 432         struct p54_common *priv = container_of(work, struct p54_common,
 433                                                work.work);
 434
 435         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
 436                 return ;
 437
 438         /*
 439          * TODO: walk through tx_queue and do the following tasks
 440          *      1. initiate bursts.
 441          *      2. cancel stuck frames / reset the device if necessary.
 442          */
 443
 444         mutex_lock(&priv->conf_mutex);
 445         WARN_ON_ONCE(p54_fetch_statistics(priv));
 446         mutex_unlock(&priv->conf_mutex);
 447 }
 448
 449 static int p54_get_stats(struct ieee80211_hw *dev,
 450                          struct ieee80211_low_level_stats *stats)
 451 {
 452         struct p54_common *priv = dev->priv;
 453
 454         memcpy(stats, &priv->stats, sizeof(*stats));
 455         return 0;
 456 }
 457
 458 static void p54_bss_info_changed(struct ieee80211_hw *dev,
 459                                  struct ieee80211_vif *vif,
 460                                  struct ieee80211_bss_conf *info,
 461                                  u32 changed)
 462 {
 463         struct p54_common *priv = dev->priv;
 464
 465         mutex_lock(&priv->conf_mutex);
 466         if (changed & BSS_CHANGED_BSSID) {
 467                 memcpy(priv->bssid, info->bssid, ETH_ALEN);
 468                 p54_setup_mac(priv);
 469         }
 470
 471         if (changed & BSS_CHANGED_BEACON) {
 472                 p54_scan(priv, P54_SCAN_EXIT, 0);
 473                 p54_setup_mac(priv);
 474                 p54_beacon_update(priv, vif);
 475                 p54_set_edcf(priv);
 476         }
 477
 478         if (changed & (BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BEACON)) {
 479                 priv->use_short_slot = info->use_short_slot;
 480                 p54_set_edcf(priv);
 481         }
 482         if (changed & BSS_CHANGED_BASIC_RATES) {
 483                 if (dev->conf.chandef.chan->band == IEEE80211_BAND_5GHZ)
 484                         priv->basic_rate_mask = (info->basic_rates << 4);
 485                 else
 486                         priv->basic_rate_mask = info->basic_rates;
 487                 p54_setup_mac(priv);
 488                 if (priv->fw_var >= 0x500)
 489                         p54_scan(priv, P54_SCAN_EXIT, 0);
 490         }
 491         if (changed & BSS_CHANGED_ASSOC) {
 492                 if (info->assoc) {
 493                         priv->aid = info->aid;
 494                         priv->wakeup_timer = info->beacon_int *
 495                                              info->dtim_period * 5;
 496                         p54_setup_mac(priv);
 497                 } else {
 498                         priv->wakeup_timer = 500;
 499                         priv->aid = 0;
 500                 }
 501         }
 502
 503         mutex_unlock(&priv->conf_mutex);
 504 }
 505
 506 static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
 507                        struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 508                        struct ieee80211_key_conf *key)
 509 {
 510         struct p54_common *priv = dev->priv;
 511         int slot, ret = 0;
 512         u8 algo = 0;
 513         u8 *addr = NULL;
 514
 515         if (modparam_nohwcrypt)
 516                 return -EOPNOTSUPP;
 517
 518         if (key->flags & IEEE80211_KEY_FLAG_RX_MGMT) {
 519                 /*
 520                  * Unfortunately most/all firmwares are trying to decrypt
 521                  * incoming management frames if a suitable key can be found.
 522                  * However, in doing so the data in these frames gets
 523                  * corrupted. So, we can't have firmware supported crypto
 524                  * offload in this case.
 525                  */
 526                 return -EOPNOTSUPP;
 527         }
 528
 529         mutex_lock(&priv->conf_mutex);
 530         if (cmd == SET_KEY) {
 531                 switch (key->cipher) {
 532                 case WLAN_CIPHER_SUITE_TKIP:
 533                         if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL |
 534                               BR_DESC_PRIV_CAP_TKIP))) {
 535                                 ret = -EOPNOTSUPP;
 536                                 goto out_unlock;
 537                         }
 538                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 539                         algo = P54_CRYPTO_TKIPMICHAEL;
 540                         break;
 541                 case WLAN_CIPHER_SUITE_WEP40:
 542                 case WLAN_CIPHER_SUITE_WEP104:
 543                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) {
 544                                 ret = -EOPNOTSUPP;
 545                                 goto out_unlock;
 546                         }
 547                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 548                         algo = P54_CRYPTO_WEP;
 549                         break;
 550                 case WLAN_CIPHER_SUITE_CCMP:
 551                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) {
 552                                 ret = -EOPNOTSUPP;
 553                                 goto out_unlock;
 554                         }
 555                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 556                         algo = P54_CRYPTO_AESCCMP;
 557                         break;
 558                 default:
 559                         ret = -EOPNOTSUPP;
 560                         goto out_unlock;
 561                 }
 562                 slot = bitmap_find_free_region(priv->used_rxkeys,
 563                                                priv->rx_keycache_size, 0);
 564
 565                 if (slot < 0) {
 566                         /*
 567                          * The device supports the chosen algorithm, but the
 568                          * firmware does not provide enough key slots to store
 569                          * all of them.
 570                          * But encryption offload for outgoing frames is always
 571                          * possible, so we just pretend that the upload was
 572                          * successful and do the decryption in software.
 573                          */
 574
 575                         /* mark the key as invalid. */
 576                         key->hw_key_idx = 0xff;
 577                         goto out_unlock;
 578                 }
 579         } else {
 580                 slot = key->hw_key_idx;
 581
 582                 if (slot == 0xff) {
 583                         /* This key was not uploaded into the rx key cache. */
 584
 585                         goto out_unlock;
 586                 }
 587
 588                 bitmap_release_region(priv->used_rxkeys, slot, 0);
 589                 algo = 0;
 590         }
 591
 592         if (sta)
 593                 addr = sta->addr;
 594
 595         ret = p54_upload_key(priv, algo, slot, key->keyidx,
 596                              key->keylen, addr, key->key);
 597         if (ret) {
 598                 bitmap_release_region(priv->used_rxkeys, slot, 0);
 599                 ret = -EOPNOTSUPP;
 600                 goto out_unlock;
 601         }
 602
 603         key->hw_key_idx = slot;
 604
 605 out_unlock:
 606         mutex_unlock(&priv->conf_mutex);
 607         return ret;
 608 }
 609
 610 static int p54_get_survey(struct ieee80211_hw *dev, int idx,
 611                                 struct survey_info *survey)
 612 {
 613         struct p54_common *priv = dev->priv;
 614         struct ieee80211_channel *chan;
 615         int err, tries;
 616         bool in_use = false;
 617
 618         if (idx >= priv->chan_num)
 619                 return -ENOENT;
 620
 621 #define MAX_TRIES 1
 622         for (tries = 0; tries < MAX_TRIES; tries++) {
 623                 chan = priv->curchan;
 624                 if (chan && chan->hw_value == idx) {
 625                         mutex_lock(&priv->conf_mutex);
 626                         err = p54_wait_for_stats(dev);
 627                         mutex_unlock(&priv->conf_mutex);
 628                         if (err)
 629                                 return err;
 630
 631                         in_use = true;
 632                 }
 633
 634                 memcpy(survey, &priv->survey[idx], sizeof(*survey));
 635
 636                 if (in_use) {
 637                         /* test if the reported statistics are valid. */
 638                         if  (survey->channel_time != 0) {
 639                                 survey->filled |= SURVEY_INFO_IN_USE;
 640                         } else {
 641                                 /*
 642                                  * hw/fw has not accumulated enough sample sets.
 643                                  * Wait for 100ms, this ought to be enough to
 644                                  * to get at least one non-null set of channel
 645                                  * usage statistics.
 646                                  */
 647                                 msleep(100);
 648                                 continue;
 649                         }
 650                 }
 651                 return 0;
 652         }
 653         return -ETIMEDOUT;
 654 #undef MAX_TRIES
 655 }
 656
 657 static unsigned int p54_flush_count(struct p54_common *priv)
 658 {
 659         unsigned int total = 0, i;
 660
 661         BUILD_BUG_ON(P54_QUEUE_NUM > ARRAY_SIZE(priv->tx_stats));
 662
 663         /*
 664          * Because the firmware has the sole control over any frames
 665          * in the P54_QUEUE_BEACON or P54_QUEUE_SCAN queues, they
 666          * don't really count as pending or active.
 667          */
 668         for (i = P54_QUEUE_MGMT; i < P54_QUEUE_NUM; i++)
 669                 total += priv->tx_stats[i].len;
 670         return total;
 671 }
 672
 673 static void p54_flush(struct ieee80211_hw *dev, u32 queues, bool drop)
 674 {
 675         struct p54_common *priv = dev->priv;
 676         unsigned int total, i;
 677
 678         /*
 679          * Currently, it wouldn't really matter if we wait for one second
 680          * or 15 minutes. But once someone gets around and completes the
 681          * TODOs [ancel stuck frames / reset device] in p54_work, it will
 682          * suddenly make sense to wait that long.
 683          */
 684         i = P54_STATISTICS_UPDATE * 2 / 20;
 685
 686         /*
 687          * In this case no locking is required because as we speak the
 688          * queues have already been stopped and no new frames can sneak
 689          * up from behind.
 690          */
 691         while ((total = p54_flush_count(priv) && i--)) {
 692                 /* waste time */
 693                 msleep(20);
 694         }
 695
 696         WARN(total, "tx flush timeout, unresponsive firmware");
 697 }
 698
 699 static void p54_set_coverage_class(struct ieee80211_hw *dev, u8 coverage_class)
 700 {
 701         struct p54_common *priv = dev->priv;
 702
 703         mutex_lock(&priv->conf_mutex);
 704         /* support all coverage class values as in 802.11-2007 Table 7-27 */
 705         priv->coverage_class = clamp_t(u8, coverage_class, 0, 31);
 706         p54_set_edcf(priv);
 707         mutex_unlock(&priv->conf_mutex);
 708 }
 709
 710 static const struct ieee80211_ops p54_ops = {
 711         .tx                     = p54_tx_80211,
 712         .start                  = p54_start,
 713         .stop                   = p54_stop,
 714         .add_interface          = p54_add_interface,
 715         .remove_interface       = p54_remove_interface,
 716         .set_tim                = p54_set_tim,
 717         .sta_notify             = p54_sta_notify,
 718         .sta_add                = p54_sta_add_remove,
 719         .sta_remove             = p54_sta_add_remove,
 720         .set_key                = p54_set_key,
 721         .config                 = p54_config,
 722         .flush                  = p54_flush,
 723         .bss_info_changed       = p54_bss_info_changed,
 724         .prepare_multicast      = p54_prepare_multicast,
 725         .configure_filter       = p54_configure_filter,
 726         .conf_tx                = p54_conf_tx,
 727         .get_stats              = p54_get_stats,
 728         .get_survey             = p54_get_survey,
 729         .set_coverage_class     = p54_set_coverage_class,
 730 };
 731
 732 struct ieee80211_hw *p54_init_common(size_t priv_data_len)
 733 {
 734         struct ieee80211_hw *dev;
 735         struct p54_common *priv;
 736
 737         dev = ieee80211_alloc_hw(priv_data_len, &p54_ops);
 738         if (!dev)
 739                 return NULL;
 740
 741         priv = dev->priv;
 742         priv->hw = dev;
 743         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 744         priv->basic_rate_mask = 0x15f;
 745         spin_lock_init(&priv->tx_stats_lock);
 746         skb_queue_head_init(&priv->tx_queue);
 747         skb_queue_head_init(&priv->tx_pending);
 748         dev->flags = IEEE80211_HW_RX_INCLUDES_FCS |
 749                      IEEE80211_HW_SIGNAL_DBM |
 750                      IEEE80211_HW_SUPPORTS_PS |
 751                      IEEE80211_HW_PS_NULLFUNC_STACK |
 752                      IEEE80211_HW_MFP_CAPABLE |
 753                      IEEE80211_HW_REPORTS_TX_ACK_STATUS;
 754
 755         dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
 756                                       BIT(NL80211_IFTYPE_ADHOC) |
 757                                       BIT(NL80211_IFTYPE_AP) |
 758                                       BIT(NL80211_IFTYPE_MESH_POINT);
 759
 760         dev->channel_change_time = 1000;        /* TODO: find actual value */
 761         priv->beacon_req_id = cpu_to_le32(0);
 762         priv->tx_stats[P54_QUEUE_BEACON].limit = 1;
 763         priv->tx_stats[P54_QUEUE_FWSCAN].limit = 1;
 764         priv->tx_stats[P54_QUEUE_MGMT].limit = 3;
 765         priv->tx_stats[P54_QUEUE_CAB].limit = 3;
 766         priv->tx_stats[P54_QUEUE_DATA].limit = 5;
 767         dev->queues = 1;
 768         priv->noise = -94;
 769         /*
 770          * We support at most 8 tries no matter which rate they're at,
 771          * we cannot support max_rates * max_rate_tries as we set it
 772          * here, but setting it correctly to 4/2 or so would limit us
 773          * artificially if the RC algorithm wants just two rates, so
 774          * let's say 4/7, we'll redistribute it at TX time, see the
 775          * comments there.
 776          */
 777         dev->max_rates = 4;
 778         dev->max_rate_tries = 7;
 779         dev->extra_tx_headroom = sizeof(struct p54_hdr) + 4 +
 780                                  sizeof(struct p54_tx_data);
 781
 782         /*
 783          * For now, disable PS by default because it affects
 784          * link stability significantly.
 785          */
 786         dev->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
 787
 788         mutex_init(&priv->conf_mutex);
 789         mutex_init(&priv->eeprom_mutex);
 790         init_completion(&priv->stat_comp);
 791         init_completion(&priv->eeprom_comp);
 792         init_completion(&priv->beacon_comp);
 793         INIT_DELAYED_WORK(&priv->work, p54_work);
 794
 795         memset(&priv->mc_maclist[0], ~0, ETH_ALEN);
 796         priv->curchan = NULL;
 797         p54_reset_stats(priv);
 798         return dev;
 799 }
 800 EXPORT_SYMBOL_GPL(p54_init_common);
 801
 802 int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
 803 {
 804         struct p54_common __maybe_unused *priv = dev->priv;
 805         int err;
 806
 807         err = ieee80211_register_hw(dev);
 808         if (err) {
 809                 dev_err(pdev, "Cannot register device (%d).\n", err);
 810                 return err;
 811         }
 812         priv->registered = true;
 813
 814 #ifdef CONFIG_P54_LEDS
 815         err = p54_init_leds(priv);
 816         if (err) {
 817                 p54_unregister_common(dev);
 818                 return err;
 819         }
 820 #endif /* CONFIG_P54_LEDS */
 821
 822         dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy));
 823         return 0;
 824 }
 825 EXPORT_SYMBOL_GPL(p54_register_common);
 826
 827 void p54_free_common(struct ieee80211_hw *dev)
 828 {
 829         struct p54_common *priv = dev->priv;
 830         unsigned int i;
 831
 832         for (i = 0; i < IEEE80211_NUM_BANDS; i++)
 833                 kfree(priv->band_table[i]);
 834
 835         kfree(priv->iq_autocal);
 836         kfree(priv->output_limit);
 837         kfree(priv->curve_data);
 838         kfree(priv->rssi_db);
 839         kfree(priv->used_rxkeys);
 840         kfree(priv->survey);
 841         priv->iq_autocal = NULL;
 842         priv->output_limit = NULL;
 843         priv->curve_data = NULL;
 844         priv->rssi_db = NULL;
 845         priv->used_rxkeys = NULL;
 846         priv->survey = NULL;
 847         ieee80211_free_hw(dev);
 848 }
 849 EXPORT_SYMBOL_GPL(p54_free_common);
 850
 851 void p54_unregister_common(struct ieee80211_hw *dev)
 852 {
 853         struct p54_common *priv = dev->priv;
 854
 855 #ifdef CONFIG_P54_LEDS
 856         p54_unregister_leds(priv);
 857 #endif /* CONFIG_P54_LEDS */
 858
 859         if (priv->registered) {
 860                 priv->registered = false;
 861                 ieee80211_unregister_hw(dev);
 862         }
 863
 864         mutex_destroy(&priv->conf_mutex);
 865         mutex_destroy(&priv->eeprom_mutex);
 866 }
 867 EXPORT_SYMBOL_GPL(p54_unregister_common);