root/drivers/net/wireless/intersil/p54/main.c

DEFINITIONS

1. p54_sta_add_remove
2. p54_sta_notify
3. p54_set_tim
4. p54_find_ie
5. p54_beacon_format_ie_tim
6. p54_beacon_update
7. p54_start
8. p54_stop
9. p54_add_interface
10. p54_remove_interface
11. p54_wait_for_stats
12. p54_reset_stats
13. p54_config
14. p54_prepare_multicast
15. p54_configure_filter
16. p54_conf_tx
17. p54_work
18. p54_get_stats
19. p54_bss_info_changed
20. p54_set_key
21. p54_get_survey
22. p54_flush_count
23. p54_flush
24. p54_set_coverage_class
25. p54_init_common
26. p54_register_common
27. p54_free_common
28. p54_unregister_common

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * mac80211 glue code for mac80211 Prism54 drivers
   4  *
   5  * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
   6  * Copyright (c) 2007-2009, Christian Lamparter <chunkeey@web.de>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * Based on:
  10  * - the islsm (softmac prism54) driver, which is:
  11  *   Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
  12  * - stlc45xx driver
  13  *   Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
  14  */
  15 
  16 #include <linux/slab.h>
  17 #include <linux/firmware.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/module.h>
  20 
  21 #include <net/mac80211.h>
  22 
  23 #include "p54.h"
  24 #include "lmac.h"
  25 
  26 static bool modparam_nohwcrypt;
  27 module_param_named(nohwcrypt, modparam_nohwcrypt, bool, 0444);
  28 MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");
  29 MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
  30 MODULE_DESCRIPTION("Softmac Prism54 common code");
  31 MODULE_LICENSE("GPL");
  32 MODULE_ALIAS("prism54common");
  33 
  34 static int p54_sta_add_remove(struct ieee80211_hw *hw,
  35                               struct ieee80211_vif *vif,
  36                               struct ieee80211_sta *sta)
  37 {
  38         struct p54_common *priv = hw->priv;
  39 
  40         /*
  41          * Notify the firmware that we don't want or we don't
  42          * need to buffer frames for this station anymore.
  43          */
  44 
  45         p54_sta_unlock(priv, sta->addr);
  46 
  47         return 0;
  48 }
  49 
  50 static void p54_sta_notify(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
  51                               enum sta_notify_cmd notify_cmd,
  52                               struct ieee80211_sta *sta)
  53 {
  54         struct p54_common *priv = dev->priv;
  55 
  56         switch (notify_cmd) {
  57         case STA_NOTIFY_AWAKE:
  58                 /* update the firmware's filter table */
  59                 p54_sta_unlock(priv, sta->addr);
  60                 break;
  61         default:
  62                 break;
  63         }
  64 }
  65 
  66 static int p54_set_tim(struct ieee80211_hw *dev, struct ieee80211_sta *sta,
  67                         bool set)
  68 {
  69         struct p54_common *priv = dev->priv;
  70 
  71         return p54_update_beacon_tim(priv, sta->aid, set);
  72 }
  73 
  74 u8 *p54_find_ie(struct sk_buff *skb, u8 ie)
  75 {
  76         struct ieee80211_mgmt *mgmt = (void *)skb->data;
  77         u8 *pos, *end;
  78 
  79         if (skb->len <= sizeof(mgmt))
  80                 return NULL;
  81 
  82         pos = (u8 *)mgmt->u.beacon.variable;
  83         end = skb->data + skb->len;
  84         while (pos < end) {
  85                 if (pos + 2 + pos[1] > end)
  86                         return NULL;
  87 
  88                 if (pos[0] == ie)
  89                         return pos;
  90 
  91                 pos += 2 + pos[1];
  92         }
  93         return NULL;
  94 }
  95 
  96 static int p54_beacon_format_ie_tim(struct sk_buff *skb)
  97 {
  98         /*
  99          * the good excuse for this mess is ... the firmware.
 100          * The dummy TIM MUST be at the end of the beacon frame,
 101          * because it'll be overwritten!
 102          */
 103         u8 *tim;
 104         u8 dtim_len;
 105         u8 dtim_period;
 106         u8 *next;
 107 
 108         tim = p54_find_ie(skb, WLAN_EID_TIM);
 109         if (!tim)
 110                 return 0;
 111 
 112         dtim_len = tim[1];
 113         dtim_period = tim[3];
 114         next = tim + 2 + dtim_len;
 115 
 116         if (dtim_len < 3)
 117                 return -EINVAL;
 118 
 119         memmove(tim, next, skb_tail_pointer(skb) - next);
 120         tim = skb_tail_pointer(skb) - (dtim_len + 2);
 121 
 122         /* add the dummy at the end */
 123         tim[0] = WLAN_EID_TIM;
 124         tim[1] = 3;
 125         tim[2] = 0;
 126         tim[3] = dtim_period;
 127         tim[4] = 0;
 128 
 129         if (dtim_len > 3)
 130                 skb_trim(skb, skb->len - (dtim_len - 3));
 131 
 132         return 0;
 133 }
 134 
 135 static int p54_beacon_update(struct p54_common *priv,
 136                         struct ieee80211_vif *vif)
 137 {
 138         struct ieee80211_tx_control control = { };
 139         struct sk_buff *beacon;
 140         int ret;
 141 
 142         beacon = ieee80211_beacon_get(priv->hw, vif);
 143         if (!beacon)
 144                 return -ENOMEM;
 145         ret = p54_beacon_format_ie_tim(beacon);
 146         if (ret)
 147                 return ret;
 148 
 149         /*
 150          * During operation, the firmware takes care of beaconing.
 151          * The driver only needs to upload a new beacon template, once
 152          * the template was changed by the stack or userspace.
 153          *
 154          * LMAC API 3.2.2 also specifies that the driver does not need
 155          * to cancel the old beacon template by hand, instead the firmware
 156          * will release the previous one through the feedback mechanism.
 157          */
 158         p54_tx_80211(priv->hw, &control, beacon);
 159         priv->tsf_high32 = 0;
 160         priv->tsf_low32 = 0;
 161 
 162         return 0;
 163 }
 164 
 165 static int p54_start(struct ieee80211_hw *dev)
 166 {
 167         struct p54_common *priv = dev->priv;
 168         int err;
 169 
 170         mutex_lock(&priv->conf_mutex);
 171         err = priv->open(dev);
 172         if (err)
 173                 goto out;
 174         P54_SET_QUEUE(priv->qos_params[0], 0x0002, 0x0003, 0x0007, 47);
 175         P54_SET_QUEUE(priv->qos_params[1], 0x0002, 0x0007, 0x000f, 94);
 176         P54_SET_QUEUE(priv->qos_params[2], 0x0003, 0x000f, 0x03ff, 0);
 177         P54_SET_QUEUE(priv->qos_params[3], 0x0007, 0x000f, 0x03ff, 0);
 178         err = p54_set_edcf(priv);
 179         if (err)
 180                 goto out;
 181 
 182         eth_broadcast_addr(priv->bssid);
 183         priv->mode = NL80211_IFTYPE_MONITOR;
 184         err = p54_setup_mac(priv);
 185         if (err) {
 186                 priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 187                 goto out;
 188         }
 189 
 190         ieee80211_queue_delayed_work(dev, &priv->work, 0);
 191 
 192         priv->softled_state = 0;
 193         err = p54_set_leds(priv);
 194 
 195 out:
 196         mutex_unlock(&priv->conf_mutex);
 197         return err;
 198 }
 199 
 200 static void p54_stop(struct ieee80211_hw *dev)
 201 {
 202         struct p54_common *priv = dev->priv;
 203         int i;
 204 
 205         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 206         priv->softled_state = 0;
 207         cancel_delayed_work_sync(&priv->work);
 208         mutex_lock(&priv->conf_mutex);
 209         p54_set_leds(priv);
 210         priv->stop(dev);
 211         skb_queue_purge(&priv->tx_pending);
 212         skb_queue_purge(&priv->tx_queue);
 213         for (i = 0; i < P54_QUEUE_NUM; i++) {
 214                 priv->tx_stats[i].count = 0;
 215                 priv->tx_stats[i].len = 0;
 216         }
 217 
 218         priv->beacon_req_id = cpu_to_le32(0);
 219         priv->tsf_high32 = priv->tsf_low32 = 0;
 220         mutex_unlock(&priv->conf_mutex);
 221 }
 222 
 223 static int p54_add_interface(struct ieee80211_hw *dev,
 224                              struct ieee80211_vif *vif)
 225 {
 226         struct p54_common *priv = dev->priv;
 227         int err;
 228 
 229         vif->driver_flags |= IEEE80211_VIF_BEACON_FILTER;
 230 
 231         mutex_lock(&priv->conf_mutex);
 232         if (priv->mode != NL80211_IFTYPE_MONITOR) {
 233                 mutex_unlock(&priv->conf_mutex);
 234                 return -EOPNOTSUPP;
 235         }
 236 
 237         priv->vif = vif;
 238 
 239         switch (vif->type) {
 240         case NL80211_IFTYPE_STATION:
 241         case NL80211_IFTYPE_ADHOC:
 242         case NL80211_IFTYPE_AP:
 243         case NL80211_IFTYPE_MESH_POINT:
 244                 priv->mode = vif->type;
 245                 break;
 246         default:
 247                 mutex_unlock(&priv->conf_mutex);
 248                 return -EOPNOTSUPP;
 249         }
 250 
 251         memcpy(priv->mac_addr, vif->addr, ETH_ALEN);
 252         err = p54_setup_mac(priv);
 253         mutex_unlock(&priv->conf_mutex);
 254         return err;
 255 }
 256 
 257 static void p54_remove_interface(struct ieee80211_hw *dev,
 258                                  struct ieee80211_vif *vif)
 259 {
 260         struct p54_common *priv = dev->priv;
 261 
 262         mutex_lock(&priv->conf_mutex);
 263         priv->vif = NULL;
 264 
 265         /*
 266          * LMAC API 3.2.2 states that any active beacon template must be
 267          * canceled by the driver before attempting a mode transition.
 268          */
 269         if (le32_to_cpu(priv->beacon_req_id) != 0) {
 270                 p54_tx_cancel(priv, priv->beacon_req_id);
 271                 wait_for_completion_interruptible_timeout(&priv->beacon_comp, HZ);
 272         }
 273         priv->mode = NL80211_IFTYPE_MONITOR;
 274         eth_zero_addr(priv->mac_addr);
 275         eth_zero_addr(priv->bssid);
 276         p54_setup_mac(priv);
 277         mutex_unlock(&priv->conf_mutex);
 278 }
 279 
 280 static int p54_wait_for_stats(struct ieee80211_hw *dev)
 281 {
 282         struct p54_common *priv = dev->priv;
 283         int ret;
 284 
 285         priv->update_stats = true;
 286         ret = p54_fetch_statistics(priv);
 287         if (ret)
 288                 return ret;
 289 
 290         ret = wait_for_completion_interruptible_timeout(&priv->stat_comp, HZ);
 291         if (ret == 0)
 292                 return -ETIMEDOUT;
 293 
 294         return 0;
 295 }
 296 
 297 static void p54_reset_stats(struct p54_common *priv)
 298 {
 299         struct ieee80211_channel *chan = priv->curchan;
 300 
 301         if (chan) {
 302                 struct survey_info *info = &priv->survey[chan->hw_value];
 303 
 304                 /* only reset channel statistics, don't touch .filled, etc. */
 305                 info->time = 0;
 306                 info->time_busy = 0;
 307                 info->time_tx = 0;
 308         }
 309 
 310         priv->update_stats = true;
 311         priv->survey_raw.active = 0;
 312         priv->survey_raw.cca = 0;
 313         priv->survey_raw.tx = 0;
 314 }
 315 
 316 static int p54_config(struct ieee80211_hw *dev, u32 changed)
 317 {
 318         int ret = 0;
 319         struct p54_common *priv = dev->priv;
 320         struct ieee80211_conf *conf = &dev->conf;
 321 
 322         mutex_lock(&priv->conf_mutex);
 323         if (changed & IEEE80211_CONF_CHANGE_POWER)
 324                 priv->output_power = conf->power_level << 2;
 325         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 326                 struct ieee80211_channel *oldchan;
 327                 WARN_ON(p54_wait_for_stats(dev));
 328                 oldchan = priv->curchan;
 329                 priv->curchan = NULL;
 330                 ret = p54_scan(priv, P54_SCAN_EXIT, 0);
 331                 if (ret) {
 332                         priv->curchan = oldchan;
 333                         goto out;
 334                 }
 335                 /*
 336                  * TODO: Use the LM_SCAN_TRAP to determine the current
 337                  * operating channel.
 338                  */
 339                 priv->curchan = priv->hw->conf.chandef.chan;
 340                 p54_reset_stats(priv);
 341                 WARN_ON(p54_fetch_statistics(priv));
 342         }
 343         if (changed & IEEE80211_CONF_CHANGE_PS) {
 344                 WARN_ON(p54_wait_for_stats(dev));
 345                 ret = p54_set_ps(priv);
 346                 if (ret)
 347                         goto out;
 348                 WARN_ON(p54_wait_for_stats(dev));
 349         }
 350         if (changed & IEEE80211_CONF_CHANGE_IDLE) {
 351                 WARN_ON(p54_wait_for_stats(dev));
 352                 ret = p54_setup_mac(priv);
 353                 if (ret)
 354                         goto out;
 355                 WARN_ON(p54_wait_for_stats(dev));
 356         }
 357 
 358 out:
 359         mutex_unlock(&priv->conf_mutex);
 360         return ret;
 361 }
 362 
 363 static u64 p54_prepare_multicast(struct ieee80211_hw *dev,
 364                                  struct netdev_hw_addr_list *mc_list)
 365 {
 366         struct p54_common *priv = dev->priv;
 367         struct netdev_hw_addr *ha;
 368         int i;
 369 
 370         BUILD_BUG_ON(ARRAY_SIZE(priv->mc_maclist) !=
 371                 ARRAY_SIZE(((struct p54_group_address_table *)NULL)->mac_list));
 372         /*
 373          * The first entry is reserved for the global broadcast MAC.
 374          * Otherwise the firmware will drop it and ARP will no longer work.
 375          */
 376         i = 1;
 377         priv->mc_maclist_num = netdev_hw_addr_list_count(mc_list) + i;
 378         netdev_hw_addr_list_for_each(ha, mc_list) {
 379                 memcpy(&priv->mc_maclist[i], ha->addr, ETH_ALEN);
 380                 i++;
 381                 if (i >= ARRAY_SIZE(priv->mc_maclist))
 382                         break;
 383         }
 384 
 385         return 1; /* update */
 386 }
 387 
 388 static void p54_configure_filter(struct ieee80211_hw *dev,
 389                                  unsigned int changed_flags,
 390                                  unsigned int *total_flags,
 391                                  u64 multicast)
 392 {
 393         struct p54_common *priv = dev->priv;
 394 
 395         *total_flags &= FIF_ALLMULTI | FIF_OTHER_BSS;
 396 
 397         priv->filter_flags = *total_flags;
 398 
 399         if (changed_flags & FIF_OTHER_BSS)
 400                 p54_setup_mac(priv);
 401 
 402         if (changed_flags & FIF_ALLMULTI || multicast)
 403                 p54_set_groupfilter(priv);
 404 }
 405 
 406 static int p54_conf_tx(struct ieee80211_hw *dev,
 407                        struct ieee80211_vif *vif, u16 queue,
 408                        const struct ieee80211_tx_queue_params *params)
 409 {
 410         struct p54_common *priv = dev->priv;
 411         int ret;
 412 
 413         mutex_lock(&priv->conf_mutex);
 414         P54_SET_QUEUE(priv->qos_params[queue], params->aifs,
 415                       params->cw_min, params->cw_max, params->txop);
 416         ret = p54_set_edcf(priv);
 417         mutex_unlock(&priv->conf_mutex);
 418         return ret;
 419 }
 420 
 421 static void p54_work(struct work_struct *work)
 422 {
 423         struct p54_common *priv = container_of(work, struct p54_common,
 424                                                work.work);
 425 
 426         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
 427                 return ;
 428 
 429         /*
 430          * TODO: walk through tx_queue and do the following tasks
 431          *      1. initiate bursts.
 432          *      2. cancel stuck frames / reset the device if necessary.
 433          */
 434 
 435         mutex_lock(&priv->conf_mutex);
 436         WARN_ON_ONCE(p54_fetch_statistics(priv));
 437         mutex_unlock(&priv->conf_mutex);
 438 }
 439 
 440 static int p54_get_stats(struct ieee80211_hw *dev,
 441                          struct ieee80211_low_level_stats *stats)
 442 {
 443         struct p54_common *priv = dev->priv;
 444 
 445         memcpy(stats, &priv->stats, sizeof(*stats));
 446         return 0;
 447 }
 448 
 449 static void p54_bss_info_changed(struct ieee80211_hw *dev,
 450                                  struct ieee80211_vif *vif,
 451                                  struct ieee80211_bss_conf *info,
 452                                  u32 changed)
 453 {
 454         struct p54_common *priv = dev->priv;
 455 
 456         mutex_lock(&priv->conf_mutex);
 457         if (changed & BSS_CHANGED_BSSID) {
 458                 memcpy(priv->bssid, info->bssid, ETH_ALEN);
 459                 p54_setup_mac(priv);
 460         }
 461 
 462         if (changed & BSS_CHANGED_BEACON) {
 463                 p54_scan(priv, P54_SCAN_EXIT, 0);
 464                 p54_setup_mac(priv);
 465                 p54_beacon_update(priv, vif);
 466                 p54_set_edcf(priv);
 467         }
 468 
 469         if (changed & (BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BEACON)) {
 470                 priv->use_short_slot = info->use_short_slot;
 471                 p54_set_edcf(priv);
 472         }
 473         if (changed & BSS_CHANGED_BASIC_RATES) {
 474                 if (dev->conf.chandef.chan->band == NL80211_BAND_5GHZ)
 475                         priv->basic_rate_mask = (info->basic_rates << 4);
 476                 else
 477                         priv->basic_rate_mask = info->basic_rates;
 478                 p54_setup_mac(priv);
 479                 if (priv->fw_var >= 0x500)
 480                         p54_scan(priv, P54_SCAN_EXIT, 0);
 481         }
 482         if (changed & BSS_CHANGED_ASSOC) {
 483                 if (info->assoc) {
 484                         priv->aid = info->aid;
 485                         priv->wakeup_timer = info->beacon_int *
 486                                              info->dtim_period * 5;
 487                         p54_setup_mac(priv);
 488                 } else {
 489                         priv->wakeup_timer = 500;
 490                         priv->aid = 0;
 491                 }
 492         }
 493 
 494         mutex_unlock(&priv->conf_mutex);
 495 }
 496 
 497 static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
 498                        struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 499                        struct ieee80211_key_conf *key)
 500 {
 501         struct p54_common *priv = dev->priv;
 502         int slot, ret = 0;
 503         u8 algo = 0;
 504         u8 *addr = NULL;
 505 
 506         if (modparam_nohwcrypt)
 507                 return -EOPNOTSUPP;
 508 
 509         if (key->flags & IEEE80211_KEY_FLAG_RX_MGMT) {
 510                 /*
 511                  * Unfortunately most/all firmwares are trying to decrypt
 512                  * incoming management frames if a suitable key can be found.
 513                  * However, in doing so the data in these frames gets
 514                  * corrupted. So, we can't have firmware supported crypto
 515                  * offload in this case.
 516                  */
 517                 return -EOPNOTSUPP;
 518         }
 519 
 520         mutex_lock(&priv->conf_mutex);
 521         if (cmd == SET_KEY) {
 522                 switch (key->cipher) {
 523                 case WLAN_CIPHER_SUITE_TKIP:
 524                         if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL |
 525                               BR_DESC_PRIV_CAP_TKIP))) {
 526                                 ret = -EOPNOTSUPP;
 527                                 goto out_unlock;
 528                         }
 529                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 530                         algo = P54_CRYPTO_TKIPMICHAEL;
 531                         break;
 532                 case WLAN_CIPHER_SUITE_WEP40:
 533                 case WLAN_CIPHER_SUITE_WEP104:
 534                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) {
 535                                 ret = -EOPNOTSUPP;
 536                                 goto out_unlock;
 537                         }
 538                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 539                         algo = P54_CRYPTO_WEP;
 540                         break;
 541                 case WLAN_CIPHER_SUITE_CCMP:
 542                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) {
 543                                 ret = -EOPNOTSUPP;
 544                                 goto out_unlock;
 545                         }
 546                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 547                         algo = P54_CRYPTO_AESCCMP;
 548                         break;
 549                 default:
 550                         ret = -EOPNOTSUPP;
 551                         goto out_unlock;
 552                 }
 553                 slot = bitmap_find_free_region(priv->used_rxkeys,
 554                                                priv->rx_keycache_size, 0);
 555 
 556                 if (slot < 0) {
 557                         /*
 558                          * The device supports the chosen algorithm, but the
 559                          * firmware does not provide enough key slots to store
 560                          * all of them.
 561                          * But encryption offload for outgoing frames is always
 562                          * possible, so we just pretend that the upload was
 563                          * successful and do the decryption in software.
 564                          */
 565 
 566                         /* mark the key as invalid. */
 567                         key->hw_key_idx = 0xff;
 568                         goto out_unlock;
 569                 }
 570 
 571                 key->flags |= IEEE80211_KEY_FLAG_RESERVE_TAILROOM;
 572         } else {
 573                 slot = key->hw_key_idx;
 574 
 575                 if (slot == 0xff) {
 576                         /* This key was not uploaded into the rx key cache. */
 577 
 578                         goto out_unlock;
 579                 }
 580 
 581                 bitmap_release_region(priv->used_rxkeys, slot, 0);
 582                 algo = 0;
 583         }
 584 
 585         if (sta)
 586                 addr = sta->addr;
 587 
 588         ret = p54_upload_key(priv, algo, slot, key->keyidx,
 589                              key->keylen, addr, key->key);
 590         if (ret) {
 591                 bitmap_release_region(priv->used_rxkeys, slot, 0);
 592                 ret = -EOPNOTSUPP;
 593                 goto out_unlock;
 594         }
 595 
 596         key->hw_key_idx = slot;
 597 
 598 out_unlock:
 599         mutex_unlock(&priv->conf_mutex);
 600         return ret;
 601 }
 602 
 603 static int p54_get_survey(struct ieee80211_hw *dev, int idx,
 604                                 struct survey_info *survey)
 605 {
 606         struct p54_common *priv = dev->priv;
 607         struct ieee80211_channel *chan;
 608         int err, tries;
 609         bool in_use = false;
 610 
 611         if (idx >= priv->chan_num)
 612                 return -ENOENT;
 613 
 614 #define MAX_TRIES 1
 615         for (tries = 0; tries < MAX_TRIES; tries++) {
 616                 chan = priv->curchan;
 617                 if (chan && chan->hw_value == idx) {
 618                         mutex_lock(&priv->conf_mutex);
 619                         err = p54_wait_for_stats(dev);
 620                         mutex_unlock(&priv->conf_mutex);
 621                         if (err)
 622                                 return err;
 623 
 624                         in_use = true;
 625                 }
 626 
 627                 memcpy(survey, &priv->survey[idx], sizeof(*survey));
 628 
 629                 if (in_use) {
 630                         /* test if the reported statistics are valid. */
 631                         if  (survey->time != 0) {
 632                                 survey->filled |= SURVEY_INFO_IN_USE;
 633                         } else {
 634                                 /*
 635                                  * hw/fw has not accumulated enough sample sets.
 636                                  * Wait for 100ms, this ought to be enough to
 637                                  * to get at least one non-null set of channel
 638                                  * usage statistics.
 639                                  */
 640                                 msleep(100);
 641                                 continue;
 642                         }
 643                 }
 644                 return 0;
 645         }
 646         return -ETIMEDOUT;
 647 #undef MAX_TRIES
 648 }
 649 
 650 static unsigned int p54_flush_count(struct p54_common *priv)
 651 {
 652         unsigned int total = 0, i;
 653 
 654         BUILD_BUG_ON(P54_QUEUE_NUM > ARRAY_SIZE(priv->tx_stats));
 655 
 656         /*
 657          * Because the firmware has the sole control over any frames
 658          * in the P54_QUEUE_BEACON or P54_QUEUE_SCAN queues, they
 659          * don't really count as pending or active.
 660          */
 661         for (i = P54_QUEUE_MGMT; i < P54_QUEUE_NUM; i++)
 662                 total += priv->tx_stats[i].len;
 663         return total;
 664 }
 665 
 666 static void p54_flush(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
 667                       u32 queues, bool drop)
 668 {
 669         struct p54_common *priv = dev->priv;
 670         unsigned int total, i;
 671 
 672         /*
 673          * Currently, it wouldn't really matter if we wait for one second
 674          * or 15 minutes. But once someone gets around and completes the
 675          * TODOs [ancel stuck frames / reset device] in p54_work, it will
 676          * suddenly make sense to wait that long.
 677          */
 678         i = P54_STATISTICS_UPDATE * 2 / 20;
 679 
 680         /*
 681          * In this case no locking is required because as we speak the
 682          * queues have already been stopped and no new frames can sneak
 683          * up from behind.
 684          */
 685         while ((total = p54_flush_count(priv) && i--)) {
 686                 /* waste time */
 687                 msleep(20);
 688         }
 689 
 690         WARN(total, "tx flush timeout, unresponsive firmware");
 691 }
 692 
 693 static void p54_set_coverage_class(struct ieee80211_hw *dev,
 694                                    s16 coverage_class)
 695 {
 696         struct p54_common *priv = dev->priv;
 697 
 698         mutex_lock(&priv->conf_mutex);
 699         /* support all coverage class values as in 802.11-2007 Table 7-27 */
 700         priv->coverage_class = clamp_t(u8, coverage_class, 0, 31);
 701         p54_set_edcf(priv);
 702         mutex_unlock(&priv->conf_mutex);
 703 }
 704 
 705 static const struct ieee80211_ops p54_ops = {
 706         .tx                     = p54_tx_80211,
 707         .start                  = p54_start,
 708         .stop                   = p54_stop,
 709         .add_interface          = p54_add_interface,
 710         .remove_interface       = p54_remove_interface,
 711         .set_tim                = p54_set_tim,
 712         .sta_notify             = p54_sta_notify,
 713         .sta_add                = p54_sta_add_remove,
 714         .sta_remove             = p54_sta_add_remove,
 715         .set_key                = p54_set_key,
 716         .config                 = p54_config,
 717         .flush                  = p54_flush,
 718         .bss_info_changed       = p54_bss_info_changed,
 719         .prepare_multicast      = p54_prepare_multicast,
 720         .configure_filter       = p54_configure_filter,
 721         .conf_tx                = p54_conf_tx,
 722         .get_stats              = p54_get_stats,
 723         .get_survey             = p54_get_survey,
 724         .set_coverage_class     = p54_set_coverage_class,
 725 };
 726 
 727 struct ieee80211_hw *p54_init_common(size_t priv_data_len)
 728 {
 729         struct ieee80211_hw *dev;
 730         struct p54_common *priv;
 731 
 732         dev = ieee80211_alloc_hw(priv_data_len, &p54_ops);
 733         if (!dev)
 734                 return NULL;
 735 
 736         priv = dev->priv;
 737         priv->hw = dev;
 738         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 739         priv->basic_rate_mask = 0x15f;
 740         spin_lock_init(&priv->tx_stats_lock);
 741         skb_queue_head_init(&priv->tx_queue);
 742         skb_queue_head_init(&priv->tx_pending);
 743         ieee80211_hw_set(dev, REPORTS_TX_ACK_STATUS);
 744         ieee80211_hw_set(dev, MFP_CAPABLE);
 745         ieee80211_hw_set(dev, PS_NULLFUNC_STACK);
 746         ieee80211_hw_set(dev, SUPPORTS_PS);
 747         ieee80211_hw_set(dev, RX_INCLUDES_FCS);
 748         ieee80211_hw_set(dev, SIGNAL_DBM);
 749 
 750         dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
 751                                       BIT(NL80211_IFTYPE_ADHOC) |
 752                                       BIT(NL80211_IFTYPE_AP) |
 753                                       BIT(NL80211_IFTYPE_MESH_POINT);
 754 
 755         priv->beacon_req_id = cpu_to_le32(0);
 756         priv->tx_stats[P54_QUEUE_BEACON].limit = 1;
 757         priv->tx_stats[P54_QUEUE_FWSCAN].limit = 1;
 758         priv->tx_stats[P54_QUEUE_MGMT].limit = 3;
 759         priv->tx_stats[P54_QUEUE_CAB].limit = 3;
 760         priv->tx_stats[P54_QUEUE_DATA].limit = 5;
 761         dev->queues = 1;
 762         priv->noise = -94;
 763         /*
 764          * We support at most 8 tries no matter which rate they're at,
 765          * we cannot support max_rates * max_rate_tries as we set it
 766          * here, but setting it correctly to 4/2 or so would limit us
 767          * artificially if the RC algorithm wants just two rates, so
 768          * let's say 4/7, we'll redistribute it at TX time, see the
 769          * comments there.
 770          */
 771         dev->max_rates = 4;
 772         dev->max_rate_tries = 7;
 773         dev->extra_tx_headroom = sizeof(struct p54_hdr) + 4 +
 774                                  sizeof(struct p54_tx_data);
 775 
 776         /*
 777          * For now, disable PS by default because it affects
 778          * link stability significantly.
 779          */
 780         dev->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
 781 
 782         mutex_init(&priv->conf_mutex);
 783         mutex_init(&priv->eeprom_mutex);
 784         init_completion(&priv->stat_comp);
 785         init_completion(&priv->eeprom_comp);
 786         init_completion(&priv->beacon_comp);
 787         INIT_DELAYED_WORK(&priv->work, p54_work);
 788 
 789         eth_broadcast_addr(priv->mc_maclist[0]);
 790         priv->curchan = NULL;
 791         p54_reset_stats(priv);
 792         return dev;
 793 }
 794 EXPORT_SYMBOL_GPL(p54_init_common);
 795 
 796 int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
 797 {
 798         struct p54_common __maybe_unused *priv = dev->priv;
 799         int err;
 800 
 801         err = ieee80211_register_hw(dev);
 802         if (err) {
 803                 dev_err(pdev, "Cannot register device (%d).\n", err);
 804                 return err;
 805         }
 806         priv->registered = true;
 807 
 808 #ifdef CONFIG_P54_LEDS
 809         err = p54_init_leds(priv);
 810         if (err) {
 811                 p54_unregister_common(dev);
 812                 return err;
 813         }
 814 #endif /* CONFIG_P54_LEDS */
 815 
 816         dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy));
 817         return 0;
 818 }
 819 EXPORT_SYMBOL_GPL(p54_register_common);
 820 
 821 void p54_free_common(struct ieee80211_hw *dev)
 822 {
 823         struct p54_common *priv = dev->priv;
 824         unsigned int i;
 825 
 826         for (i = 0; i < NUM_NL80211_BANDS; i++)
 827                 kfree(priv->band_table[i]);
 828 
 829         kfree(priv->iq_autocal);
 830         kfree(priv->output_limit);
 831         kfree(priv->curve_data);
 832         kfree(priv->rssi_db);
 833         kfree(priv->used_rxkeys);
 834         kfree(priv->survey);
 835         priv->iq_autocal = NULL;
 836         priv->output_limit = NULL;
 837         priv->curve_data = NULL;
 838         priv->rssi_db = NULL;
 839         priv->used_rxkeys = NULL;
 840         priv->survey = NULL;
 841         ieee80211_free_hw(dev);
 842 }
 843 EXPORT_SYMBOL_GPL(p54_free_common);
 844 
 845 void p54_unregister_common(struct ieee80211_hw *dev)
 846 {
 847         struct p54_common *priv = dev->priv;
 848 
 849         if (priv->registered) {
 850                 priv->registered = false;
 851 #ifdef CONFIG_P54_LEDS
 852                 p54_unregister_leds(priv);
 853 #endif /* CONFIG_P54_LEDS */
 854                 ieee80211_unregister_hw(dev);
 855         }
 856 
 857         mutex_destroy(&priv->conf_mutex);
 858         mutex_destroy(&priv->eeprom_mutex);
 859 }
 860 EXPORT_SYMBOL_GPL(p54_unregister_common);