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/slab.h>
  20 #include <linux/firmware.h>
  21 #include <linux/etherdevice.h>
  22 #include <linux/module.h>
  23
  24 #include <net/mac80211.h>
  25
  26 #include "p54.h"
  27 #include "lmac.h"
  28
  29 static bool modparam_nohwcrypt;
  30 module_param_named(nohwcrypt, modparam_nohwcrypt, bool, S_IRUGO);
  31 MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");
  32 MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
  33 MODULE_DESCRIPTION("Softmac Prism54 common code");
  34 MODULE_LICENSE("GPL");
  35 MODULE_ALIAS("prism54common");
  36
  37 static int p54_sta_add_remove(struct ieee80211_hw *hw,
  38                               struct ieee80211_vif *vif,
  39                               struct ieee80211_sta *sta)
  40 {
  41         struct p54_common *priv = hw->priv;
  42
  43         /*
  44          * Notify the firmware that we don't want or we don't
  45          * need to buffer frames for this station anymore.
  46          */
  47
  48         p54_sta_unlock(priv, sta->addr);
  49
  50         return 0;
  51 }
  52
  53 static void p54_sta_notify(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
  54                               enum sta_notify_cmd notify_cmd,
  55                               struct ieee80211_sta *sta)
  56 {
  57         struct p54_common *priv = dev->priv;
  58
  59         switch (notify_cmd) {
  60         case STA_NOTIFY_AWAKE:
  61                 /* update the firmware's filter table */
  62                 p54_sta_unlock(priv, sta->addr);
  63                 break;
  64         default:
  65                 break;
  66         }
  67 }
  68
  69 static int p54_set_tim(struct ieee80211_hw *dev, struct ieee80211_sta *sta,
  70                         bool set)
  71 {
  72         struct p54_common *priv = dev->priv;
  73
  74         return p54_update_beacon_tim(priv, sta->aid, set);
  75 }
  76
  77 u8 *p54_find_ie(struct sk_buff *skb, u8 ie)
  78 {
  79         struct ieee80211_mgmt *mgmt = (void *)skb->data;
  80         u8 *pos, *end;
  81
  82         if (skb->len <= sizeof(mgmt))
  83                 return NULL;
  84
  85         pos = (u8 *)mgmt->u.beacon.variable;
  86         end = skb->data + skb->len;
  87         while (pos < end) {
  88                 if (pos + 2 + pos[1] > end)
  89                         return NULL;
  90
  91                 if (pos[0] == ie)
  92                         return pos;
  93
  94                 pos += 2 + pos[1];
  95         }
  96         return NULL;
  97 }
  98
  99 static int p54_beacon_format_ie_tim(struct sk_buff *skb)
 100 {
 101         /*
 102          * the good excuse for this mess is ... the firmware.
 103          * The dummy TIM MUST be at the end of the beacon frame,
 104          * because it'll be overwritten!
 105          */
 106         u8 *tim;
 107         u8 dtim_len;
 108         u8 dtim_period;
 109         u8 *next;
 110
 111         tim = p54_find_ie(skb, WLAN_EID_TIM);
 112         if (!tim)
 113                 return 0;
 114
 115         dtim_len = tim[1];
 116         dtim_period = tim[3];
 117         next = tim + 2 + dtim_len;
 118
 119         if (dtim_len < 3)
 120                 return -EINVAL;
 121
 122         memmove(tim, next, skb_tail_pointer(skb) - next);
 123         tim = skb_tail_pointer(skb) - (dtim_len + 2);
 124
 125         /* add the dummy at the end */
 126         tim[0] = WLAN_EID_TIM;
 127         tim[1] = 3;
 128         tim[2] = 0;
 129         tim[3] = dtim_period;
 130         tim[4] = 0;
 131
 132         if (dtim_len > 3)
 133                 skb_trim(skb, skb->len - (dtim_len - 3));
 134
 135         return 0;
 136 }
 137
 138 static int p54_beacon_update(struct p54_common *priv,
 139                         struct ieee80211_vif *vif)
 140 {
 141         struct ieee80211_tx_control control = { };
 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, &control, 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         int err;
 231
 232         vif->driver_flags |= IEEE80211_VIF_BEACON_FILTER;
 233
 234         mutex_lock(&priv->conf_mutex);
 235         if (priv->mode != NL80211_IFTYPE_MONITOR) {
 236                 mutex_unlock(&priv->conf_mutex);
 237                 return -EOPNOTSUPP;
 238         }
 239
 240         priv->vif = vif;
 241
 242         switch (vif->type) {
 243         case NL80211_IFTYPE_STATION:
 244         case NL80211_IFTYPE_ADHOC:
 245         case NL80211_IFTYPE_AP:
 246         case NL80211_IFTYPE_MESH_POINT:
 247                 priv->mode = vif->type;
 248                 break;
 249         default:
 250                 mutex_unlock(&priv->conf_mutex);
 251                 return -EOPNOTSUPP;
 252         }
 253
 254         memcpy(priv->mac_addr, vif->addr, ETH_ALEN);
 255         err = p54_setup_mac(priv);
 256         mutex_unlock(&priv->conf_mutex);
 257         return err;
 258 }
 259
 260 static void p54_remove_interface(struct ieee80211_hw *dev,
 261                                  struct ieee80211_vif *vif)
 262 {
 263         struct p54_common *priv = dev->priv;
 264
 265         mutex_lock(&priv->conf_mutex);
 266         priv->vif = NULL;
 267
 268         /*
 269          * LMAC API 3.2.2 states that any active beacon template must be
 270          * canceled by the driver before attempting a mode transition.
 271          */
 272         if (le32_to_cpu(priv->beacon_req_id) != 0) {
 273                 p54_tx_cancel(priv, priv->beacon_req_id);
 274                 wait_for_completion_interruptible_timeout(&priv->beacon_comp, HZ);
 275         }
 276         priv->mode = NL80211_IFTYPE_MONITOR;
 277         memset(priv->mac_addr, 0, ETH_ALEN);
 278         memset(priv->bssid, 0, ETH_ALEN);
 279         p54_setup_mac(priv);
 280         mutex_unlock(&priv->conf_mutex);
 281 }
 282
 283 static int p54_wait_for_stats(struct ieee80211_hw *dev)
 284 {
 285         struct p54_common *priv = dev->priv;
 286         int ret;
 287
 288         priv->update_stats = true;
 289         ret = p54_fetch_statistics(priv);
 290         if (ret)
 291                 return ret;
 292
 293         ret = wait_for_completion_interruptible_timeout(&priv->stat_comp, HZ);
 294         if (ret == 0)
 295                 return -ETIMEDOUT;
 296
 297         return 0;
 298 }
 299
 300 static void p54_reset_stats(struct p54_common *priv)
 301 {
 302         struct ieee80211_channel *chan = priv->curchan;
 303
 304         if (chan) {
 305                 struct survey_info *info = &priv->survey[chan->hw_value];
 306
 307                 /* only reset channel statistics, don't touch .filled, etc. */
 308                 info->time = 0;
 309                 info->time_busy = 0;
 310                 info->time_tx = 0;
 311         }
 312
 313         priv->update_stats = true;
 314         priv->survey_raw.active = 0;
 315         priv->survey_raw.cca = 0;
 316         priv->survey_raw.tx = 0;
 317 }
 318
 319 static int p54_config(struct ieee80211_hw *dev, u32 changed)
 320 {
 321         int ret = 0;
 322         struct p54_common *priv = dev->priv;
 323         struct ieee80211_conf *conf = &dev->conf;
 324
 325         mutex_lock(&priv->conf_mutex);
 326         if (changed & IEEE80211_CONF_CHANGE_POWER)
 327                 priv->output_power = conf->power_level << 2;
 328         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 329                 struct ieee80211_channel *oldchan;
 330                 WARN_ON(p54_wait_for_stats(dev));
 331                 oldchan = priv->curchan;
 332                 priv->curchan = NULL;
 333                 ret = p54_scan(priv, P54_SCAN_EXIT, 0);
 334                 if (ret) {
 335                         priv->curchan = oldchan;
 336                         goto out;
 337                 }
 338                 /*
 339                  * TODO: Use the LM_SCAN_TRAP to determine the current
 340                  * operating channel.
 341                  */
 342                 priv->curchan = priv->hw->conf.chandef.chan;
 343                 p54_reset_stats(priv);
 344                 WARN_ON(p54_fetch_statistics(priv));
 345         }
 346         if (changed & IEEE80211_CONF_CHANGE_PS) {
 347                 WARN_ON(p54_wait_for_stats(dev));
 348                 ret = p54_set_ps(priv);
 349                 if (ret)
 350                         goto out;
 351                 WARN_ON(p54_wait_for_stats(dev));
 352         }
 353         if (changed & IEEE80211_CONF_CHANGE_IDLE) {
 354                 WARN_ON(p54_wait_for_stats(dev));
 355                 ret = p54_setup_mac(priv);
 356                 if (ret)
 357                         goto out;
 358                 WARN_ON(p54_wait_for_stats(dev));
 359         }
 360
 361 out:
 362         mutex_unlock(&priv->conf_mutex);
 363         return ret;
 364 }
 365
 366 static u64 p54_prepare_multicast(struct ieee80211_hw *dev,
 367                                  struct netdev_hw_addr_list *mc_list)
 368 {
 369         struct p54_common *priv = dev->priv;
 370         struct netdev_hw_addr *ha;
 371         int i;
 372
 373         BUILD_BUG_ON(ARRAY_SIZE(priv->mc_maclist) !=
 374                 ARRAY_SIZE(((struct p54_group_address_table *)NULL)->mac_list));
 375         /*
 376          * The first entry is reserved for the global broadcast MAC.
 377          * Otherwise the firmware will drop it and ARP will no longer work.
 378          */
 379         i = 1;
 380         priv->mc_maclist_num = netdev_hw_addr_list_count(mc_list) + i;
 381         netdev_hw_addr_list_for_each(ha, mc_list) {
 382                 memcpy(&priv->mc_maclist[i], ha->addr, ETH_ALEN);
 383                 i++;
 384                 if (i >= ARRAY_SIZE(priv->mc_maclist))
 385                         break;
 386         }
 387
 388         return 1; /* update */
 389 }
 390
 391 static void p54_configure_filter(struct ieee80211_hw *dev,
 392                                  unsigned int changed_flags,
 393                                  unsigned int *total_flags,
 394                                  u64 multicast)
 395 {
 396         struct p54_common *priv = dev->priv;
 397
 398         *total_flags &= FIF_PROMISC_IN_BSS |
 399                         FIF_ALLMULTI |
 400                         FIF_OTHER_BSS;
 401
 402         priv->filter_flags = *total_flags;
 403
 404         if (changed_flags & (FIF_PROMISC_IN_BSS | FIF_OTHER_BSS))
 405                 p54_setup_mac(priv);
 406
 407         if (changed_flags & FIF_ALLMULTI || multicast)
 408                 p54_set_groupfilter(priv);
 409 }
 410
 411 static int p54_conf_tx(struct ieee80211_hw *dev,
 412                        struct ieee80211_vif *vif, u16 queue,
 413                        const struct ieee80211_tx_queue_params *params)
 414 {
 415         struct p54_common *priv = dev->priv;
 416         int ret;
 417
 418         mutex_lock(&priv->conf_mutex);
 419         if (queue < dev->queues) {
 420                 P54_SET_QUEUE(priv->qos_params[queue], params->aifs,
 421                         params->cw_min, params->cw_max, params->txop);
 422                 ret = p54_set_edcf(priv);
 423         } else
 424                 ret = -EINVAL;
 425         mutex_unlock(&priv->conf_mutex);
 426         return ret;
 427 }
 428
 429 static void p54_work(struct work_struct *work)
 430 {
 431         struct p54_common *priv = container_of(work, struct p54_common,
 432                                                work.work);
 433
 434         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
 435                 return ;
 436
 437         /*
 438          * TODO: walk through tx_queue and do the following tasks
 439          *      1. initiate bursts.
 440          *      2. cancel stuck frames / reset the device if necessary.
 441          */
 442
 443         mutex_lock(&priv->conf_mutex);
 444         WARN_ON_ONCE(p54_fetch_statistics(priv));
 445         mutex_unlock(&priv->conf_mutex);
 446 }
 447
 448 static int p54_get_stats(struct ieee80211_hw *dev,
 449                          struct ieee80211_low_level_stats *stats)
 450 {
 451         struct p54_common *priv = dev->priv;
 452
 453         memcpy(stats, &priv->stats, sizeof(*stats));
 454         return 0;
 455 }
 456
 457 static void p54_bss_info_changed(struct ieee80211_hw *dev,
 458                                  struct ieee80211_vif *vif,
 459                                  struct ieee80211_bss_conf *info,
 460                                  u32 changed)
 461 {
 462         struct p54_common *priv = dev->priv;
 463
 464         mutex_lock(&priv->conf_mutex);
 465         if (changed & BSS_CHANGED_BSSID) {
 466                 memcpy(priv->bssid, info->bssid, ETH_ALEN);
 467                 p54_setup_mac(priv);
 468         }
 469
 470         if (changed & BSS_CHANGED_BEACON) {
 471                 p54_scan(priv, P54_SCAN_EXIT, 0);
 472                 p54_setup_mac(priv);
 473                 p54_beacon_update(priv, vif);
 474                 p54_set_edcf(priv);
 475         }
 476
 477         if (changed & (BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BEACON)) {
 478                 priv->use_short_slot = info->use_short_slot;
 479                 p54_set_edcf(priv);
 480         }
 481         if (changed & BSS_CHANGED_BASIC_RATES) {
 482                 if (dev->conf.chandef.chan->band == IEEE80211_BAND_5GHZ)
 483                         priv->basic_rate_mask = (info->basic_rates << 4);
 484                 else
 485                         priv->basic_rate_mask = info->basic_rates;
 486                 p54_setup_mac(priv);
 487                 if (priv->fw_var >= 0x500)
 488                         p54_scan(priv, P54_SCAN_EXIT, 0);
 489         }
 490         if (changed & BSS_CHANGED_ASSOC) {
 491                 if (info->assoc) {
 492                         priv->aid = info->aid;
 493                         priv->wakeup_timer = info->beacon_int *
 494                                              info->dtim_period * 5;
 495                         p54_setup_mac(priv);
 496                 } else {
 497                         priv->wakeup_timer = 500;
 498                         priv->aid = 0;
 499                 }
 500         }
 501
 502         mutex_unlock(&priv->conf_mutex);
 503 }
 504
 505 static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
 506                        struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 507                        struct ieee80211_key_conf *key)
 508 {
 509         struct p54_common *priv = dev->priv;
 510         int slot, ret = 0;
 511         u8 algo = 0;
 512         u8 *addr = NULL;
 513
 514         if (modparam_nohwcrypt)
 515                 return -EOPNOTSUPP;
 516
 517         if (key->flags & IEEE80211_KEY_FLAG_RX_MGMT) {
 518                 /*
 519                  * Unfortunately most/all firmwares are trying to decrypt
 520                  * incoming management frames if a suitable key can be found.
 521                  * However, in doing so the data in these frames gets
 522                  * corrupted. So, we can't have firmware supported crypto
 523                  * offload in this case.
 524                  */
 525                 return -EOPNOTSUPP;
 526         }
 527
 528         mutex_lock(&priv->conf_mutex);
 529         if (cmd == SET_KEY) {
 530                 switch (key->cipher) {
 531                 case WLAN_CIPHER_SUITE_TKIP:
 532                         if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL |
 533                               BR_DESC_PRIV_CAP_TKIP))) {
 534                                 ret = -EOPNOTSUPP;
 535                                 goto out_unlock;
 536                         }
 537                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 538                         algo = P54_CRYPTO_TKIPMICHAEL;
 539                         break;
 540                 case WLAN_CIPHER_SUITE_WEP40:
 541                 case WLAN_CIPHER_SUITE_WEP104:
 542                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) {
 543                                 ret = -EOPNOTSUPP;
 544                                 goto out_unlock;
 545                         }
 546                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 547                         algo = P54_CRYPTO_WEP;
 548                         break;
 549                 case WLAN_CIPHER_SUITE_CCMP:
 550                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) {
 551                                 ret = -EOPNOTSUPP;
 552                                 goto out_unlock;
 553                         }
 554                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 555                         algo = P54_CRYPTO_AESCCMP;
 556                         break;
 557                 default:
 558                         ret = -EOPNOTSUPP;
 559                         goto out_unlock;
 560                 }
 561                 slot = bitmap_find_free_region(priv->used_rxkeys,
 562                                                priv->rx_keycache_size, 0);
 563
 564                 if (slot < 0) {
 565                         /*
 566                          * The device supports the chosen algorithm, but the
 567                          * firmware does not provide enough key slots to store
 568                          * all of them.
 569                          * But encryption offload for outgoing frames is always
 570                          * possible, so we just pretend that the upload was
 571                          * successful and do the decryption in software.
 572                          */
 573
 574                         /* mark the key as invalid. */
 575                         key->hw_key_idx = 0xff;
 576                         goto out_unlock;
 577                 }
 578
 579                 key->flags |= IEEE80211_KEY_FLAG_RESERVE_TAILROOM;
 580         } else {
 581                 slot = key->hw_key_idx;
 582
 583                 if (slot == 0xff) {
 584                         /* This key was not uploaded into the rx key cache. */
 585
 586                         goto out_unlock;
 587                 }
 588
 589                 bitmap_release_region(priv->used_rxkeys, slot, 0);
 590                 algo = 0;
 591         }
 592
 593         if (sta)
 594                 addr = sta->addr;
 595
 596         ret = p54_upload_key(priv, algo, slot, key->keyidx,
 597                              key->keylen, addr, key->key);
 598         if (ret) {
 599                 bitmap_release_region(priv->used_rxkeys, slot, 0);
 600                 ret = -EOPNOTSUPP;
 601                 goto out_unlock;
 602         }
 603
 604         key->hw_key_idx = slot;
 605
 606 out_unlock:
 607         mutex_unlock(&priv->conf_mutex);
 608         return ret;
 609 }
 610
 611 static int p54_get_survey(struct ieee80211_hw *dev, int idx,
 612                                 struct survey_info *survey)
 613 {
 614         struct p54_common *priv = dev->priv;
 615         struct ieee80211_channel *chan;
 616         int err, tries;
 617         bool in_use = false;
 618
 619         if (idx >= priv->chan_num)
 620                 return -ENOENT;
 621
 622 #define MAX_TRIES 1
 623         for (tries = 0; tries < MAX_TRIES; tries++) {
 624                 chan = priv->curchan;
 625                 if (chan && chan->hw_value == idx) {
 626                         mutex_lock(&priv->conf_mutex);
 627                         err = p54_wait_for_stats(dev);
 628                         mutex_unlock(&priv->conf_mutex);
 629                         if (err)
 630                                 return err;
 631
 632                         in_use = true;
 633                 }
 634
 635                 memcpy(survey, &priv->survey[idx], sizeof(*survey));
 636
 637                 if (in_use) {
 638                         /* test if the reported statistics are valid. */
 639                         if  (survey->time != 0) {
 640                                 survey->filled |= SURVEY_INFO_IN_USE;
 641                         } else {
 642                                 /*
 643                                  * hw/fw has not accumulated enough sample sets.
 644                                  * Wait for 100ms, this ought to be enough to
 645                                  * to get at least one non-null set of channel
 646                                  * usage statistics.
 647                                  */
 648                                 msleep(100);
 649                                 continue;
 650                         }
 651                 }
 652                 return 0;
 653         }
 654         return -ETIMEDOUT;
 655 #undef MAX_TRIES
 656 }
 657
 658 static unsigned int p54_flush_count(struct p54_common *priv)
 659 {
 660         unsigned int total = 0, i;
 661
 662         BUILD_BUG_ON(P54_QUEUE_NUM > ARRAY_SIZE(priv->tx_stats));
 663
 664         /*
 665          * Because the firmware has the sole control over any frames
 666          * in the P54_QUEUE_BEACON or P54_QUEUE_SCAN queues, they
 667          * don't really count as pending or active.
 668          */
 669         for (i = P54_QUEUE_MGMT; i < P54_QUEUE_NUM; i++)
 670                 total += priv->tx_stats[i].len;
 671         return total;
 672 }
 673
 674 static void p54_flush(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
 675                       u32 queues, bool drop)
 676 {
 677         struct p54_common *priv = dev->priv;
 678         unsigned int total, i;
 679
 680         /*
 681          * Currently, it wouldn't really matter if we wait for one second
 682          * or 15 minutes. But once someone gets around and completes the
 683          * TODOs [ancel stuck frames / reset device] in p54_work, it will
 684          * suddenly make sense to wait that long.
 685          */
 686         i = P54_STATISTICS_UPDATE * 2 / 20;
 687
 688         /*
 689          * In this case no locking is required because as we speak the
 690          * queues have already been stopped and no new frames can sneak
 691          * up from behind.
 692          */
 693         while ((total = p54_flush_count(priv) && i--)) {
 694                 /* waste time */
 695                 msleep(20);
 696         }
 697
 698         WARN(total, "tx flush timeout, unresponsive firmware");
 699 }
 700
 701 static void p54_set_coverage_class(struct ieee80211_hw *dev,
 702                                    s16 coverage_class)
 703 {
 704         struct p54_common *priv = dev->priv;
 705
 706         mutex_lock(&priv->conf_mutex);
 707         /* support all coverage class values as in 802.11-2007 Table 7-27 */
 708         priv->coverage_class = clamp_t(u8, coverage_class, 0, 31);
 709         p54_set_edcf(priv);
 710         mutex_unlock(&priv->conf_mutex);
 711 }
 712
 713 static const struct ieee80211_ops p54_ops = {
 714         .tx                     = p54_tx_80211,
 715         .start                  = p54_start,
 716         .stop                   = p54_stop,
 717         .add_interface          = p54_add_interface,
 718         .remove_interface       = p54_remove_interface,
 719         .set_tim                = p54_set_tim,
 720         .sta_notify             = p54_sta_notify,
 721         .sta_add                = p54_sta_add_remove,
 722         .sta_remove             = p54_sta_add_remove,
 723         .set_key                = p54_set_key,
 724         .config                 = p54_config,
 725         .flush                  = p54_flush,
 726         .bss_info_changed       = p54_bss_info_changed,
 727         .prepare_multicast      = p54_prepare_multicast,
 728         .configure_filter       = p54_configure_filter,
 729         .conf_tx                = p54_conf_tx,
 730         .get_stats              = p54_get_stats,
 731         .get_survey             = p54_get_survey,
 732         .set_coverage_class     = p54_set_coverage_class,
 733 };
 734
 735 struct ieee80211_hw *p54_init_common(size_t priv_data_len)
 736 {
 737         struct ieee80211_hw *dev;
 738         struct p54_common *priv;
 739
 740         dev = ieee80211_alloc_hw(priv_data_len, &p54_ops);
 741         if (!dev)
 742                 return NULL;
 743
 744         priv = dev->priv;
 745         priv->hw = dev;
 746         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 747         priv->basic_rate_mask = 0x15f;
 748         spin_lock_init(&priv->tx_stats_lock);
 749         skb_queue_head_init(&priv->tx_queue);
 750         skb_queue_head_init(&priv->tx_pending);
 751         dev->flags = IEEE80211_HW_RX_INCLUDES_FCS |
 752                      IEEE80211_HW_SIGNAL_DBM |
 753                      IEEE80211_HW_SUPPORTS_PS |
 754                      IEEE80211_HW_PS_NULLFUNC_STACK |
 755                      IEEE80211_HW_MFP_CAPABLE |
 756                      IEEE80211_HW_REPORTS_TX_ACK_STATUS;
 757
 758         dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
 759                                       BIT(NL80211_IFTYPE_ADHOC) |
 760                                       BIT(NL80211_IFTYPE_AP) |
 761                                       BIT(NL80211_IFTYPE_MESH_POINT);
 762
 763         priv->beacon_req_id = cpu_to_le32(0);
 764         priv->tx_stats[P54_QUEUE_BEACON].limit = 1;
 765         priv->tx_stats[P54_QUEUE_FWSCAN].limit = 1;
 766         priv->tx_stats[P54_QUEUE_MGMT].limit = 3;
 767         priv->tx_stats[P54_QUEUE_CAB].limit = 3;
 768         priv->tx_stats[P54_QUEUE_DATA].limit = 5;
 769         dev->queues = 1;
 770         priv->noise = -94;
 771         /*
 772          * We support at most 8 tries no matter which rate they're at,
 773          * we cannot support max_rates * max_rate_tries as we set it
 774          * here, but setting it correctly to 4/2 or so would limit us
 775          * artificially if the RC algorithm wants just two rates, so
 776          * let's say 4/7, we'll redistribute it at TX time, see the
 777          * comments there.
 778          */
 779         dev->max_rates = 4;
 780         dev->max_rate_tries = 7;
 781         dev->extra_tx_headroom = sizeof(struct p54_hdr) + 4 +
 782                                  sizeof(struct p54_tx_data);
 783
 784         /*
 785          * For now, disable PS by default because it affects
 786          * link stability significantly.
 787          */
 788         dev->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
 789
 790         mutex_init(&priv->conf_mutex);
 791         mutex_init(&priv->eeprom_mutex);
 792         init_completion(&priv->stat_comp);
 793         init_completion(&priv->eeprom_comp);
 794         init_completion(&priv->beacon_comp);
 795         INIT_DELAYED_WORK(&priv->work, p54_work);
 796
 797         memset(&priv->mc_maclist[0], ~0, ETH_ALEN);
 798         priv->curchan = NULL;
 799         p54_reset_stats(priv);
 800         return dev;
 801 }
 802 EXPORT_SYMBOL_GPL(p54_init_common);
 803
 804 int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
 805 {
 806         struct p54_common __maybe_unused *priv = dev->priv;
 807         int err;
 808
 809         err = ieee80211_register_hw(dev);
 810         if (err) {
 811                 dev_err(pdev, "Cannot register device (%d).\n", err);
 812                 return err;
 813         }
 814         priv->registered = true;
 815
 816 #ifdef CONFIG_P54_LEDS
 817         err = p54_init_leds(priv);
 818         if (err) {
 819                 p54_unregister_common(dev);
 820                 return err;
 821         }
 822 #endif /* CONFIG_P54_LEDS */
 823
 824         dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy));
 825         return 0;
 826 }
 827 EXPORT_SYMBOL_GPL(p54_register_common);
 828
 829 void p54_free_common(struct ieee80211_hw *dev)
 830 {
 831         struct p54_common *priv = dev->priv;
 832         unsigned int i;
 833
 834         for (i = 0; i < IEEE80211_NUM_BANDS; i++)
 835                 kfree(priv->band_table[i]);
 836
 837         kfree(priv->iq_autocal);
 838         kfree(priv->output_limit);
 839         kfree(priv->curve_data);
 840         kfree(priv->rssi_db);
 841         kfree(priv->used_rxkeys);
 842         kfree(priv->survey);
 843         priv->iq_autocal = NULL;
 844         priv->output_limit = NULL;
 845         priv->curve_data = NULL;
 846         priv->rssi_db = NULL;
 847         priv->used_rxkeys = NULL;
 848         priv->survey = NULL;
 849         ieee80211_free_hw(dev);
 850 }
 851 EXPORT_SYMBOL_GPL(p54_free_common);
 852
 853 void p54_unregister_common(struct ieee80211_hw *dev)
 854 {
 855         struct p54_common *priv = dev->priv;
 856
 857 #ifdef CONFIG_P54_LEDS
 858         p54_unregister_leds(priv);
 859 #endif /* CONFIG_P54_LEDS */
 860
 861         if (priv->registered) {
 862                 priv->registered = false;
 863                 ieee80211_unregister_hw(dev);
 864         }
 865
 866         mutex_destroy(&priv->conf_mutex);
 867         mutex_destroy(&priv->eeprom_mutex);
 868 }
 869 EXPORT_SYMBOL_GPL(p54_unregister_common);