drivers/net/wireless/p54/main.c

   1 /*
   2  * mac80211 glue code for mac80211 Prism54 drivers
   3  *
   4  * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
   5  * Copyright (c) 2007-2009, Christian Lamparter <chunkeey@web.de>
   6  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   7  *
   8  * Based on:
   9  * - the islsm (softmac prism54) driver, which is:
  10  *   Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
  11  * - stlc45xx driver
  12  *   Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  */
  18
  19 #include <linux/init.h>
  20 #include <linux/slab.h>
  21 #include <linux/firmware.h>
  22 #include <linux/etherdevice.h>
  23
  24 #include <net/mac80211.h>
  25
  26 #include "p54.h"
  27 #include "lmac.h"
  28
  29 static int modparam_nohwcrypt;
  30 module_param_named(nohwcrypt, modparam_nohwcrypt, bool, S_IRUGO);
  31 MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");
  32 MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
  33 MODULE_DESCRIPTION("Softmac Prism54 common code");
  34 MODULE_LICENSE("GPL");
  35 MODULE_ALIAS("prism54common");
  36
  37 static int p54_sta_add_remove(struct ieee80211_hw *hw,
  38                               struct ieee80211_vif *vif,
  39                               struct ieee80211_sta *sta)
  40 {
  41         struct p54_common *priv = hw->priv;
  42
  43         /*
  44          * Notify the firmware that we don't want or we don't
  45          * need to buffer frames for this station anymore.
  46          */
  47
  48         p54_sta_unlock(priv, sta->addr);
  49
  50         return 0;
  51 }
  52
  53 static void p54_sta_notify(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
  54                               enum sta_notify_cmd notify_cmd,
  55                               struct ieee80211_sta *sta)
  56 {
  57         struct p54_common *priv = dev->priv;
  58
  59         switch (notify_cmd) {
  60         case STA_NOTIFY_AWAKE:
  61                 /* update the firmware's filter table */
  62                 p54_sta_unlock(priv, sta->addr);
  63                 break;
  64         default:
  65                 break;
  66         }
  67 }
  68
  69 static int p54_set_tim(struct ieee80211_hw *dev, struct ieee80211_sta *sta,
  70                         bool set)
  71 {
  72         struct p54_common *priv = dev->priv;
  73
  74         return p54_update_beacon_tim(priv, sta->aid, set);
  75 }
  76
  77 u8 *p54_find_ie(struct sk_buff *skb, u8 ie)
  78 {
  79         struct ieee80211_mgmt *mgmt = (void *)skb->data;
  80         u8 *pos, *end;
  81
  82         if (skb->len <= sizeof(mgmt))
  83                 return NULL;
  84
  85         pos = (u8 *)mgmt->u.beacon.variable;
  86         end = skb->data + skb->len;
  87         while (pos < end) {
  88                 if (pos + 2 + pos[1] > end)
  89                         return NULL;
  90
  91                 if (pos[0] == ie)
  92                         return pos;
  93
  94                 pos += 2 + pos[1];
  95         }
  96         return NULL;
  97 }
  98
  99 static int p54_beacon_format_ie_tim(struct sk_buff *skb)
 100 {
 101         /*
 102          * the good excuse for this mess is ... the firmware.
 103          * The dummy TIM MUST be at the end of the beacon frame,
 104          * because it'll be overwritten!
 105          */
 106         u8 *tim;
 107         u8 dtim_len;
 108         u8 dtim_period;
 109         u8 *next;
 110
 111         tim = p54_find_ie(skb, WLAN_EID_TIM);
 112         if (!tim)
 113                 return 0;
 114
 115         dtim_len = tim[1];
 116         dtim_period = tim[3];
 117         next = tim + 2 + dtim_len;
 118
 119         if (dtim_len < 3)
 120                 return -EINVAL;
 121
 122         memmove(tim, next, skb_tail_pointer(skb) - next);
 123         tim = skb_tail_pointer(skb) - (dtim_len + 2);
 124
 125         /* add the dummy at the end */
 126         tim[0] = WLAN_EID_TIM;
 127         tim[1] = 3;
 128         tim[2] = 0;
 129         tim[3] = dtim_period;
 130         tim[4] = 0;
 131
 132         if (dtim_len > 3)
 133                 skb_trim(skb, skb->len - (dtim_len - 3));
 134
 135         return 0;
 136 }
 137
 138 static int p54_beacon_update(struct p54_common *priv,
 139                         struct ieee80211_vif *vif)
 140 {
 141         struct sk_buff *beacon;
 142         int ret;
 143
 144         beacon = ieee80211_beacon_get(priv->hw, vif);
 145         if (!beacon)
 146                 return -ENOMEM;
 147         ret = p54_beacon_format_ie_tim(beacon);
 148         if (ret)
 149                 return ret;
 150
 151         /*
 152          * During operation, the firmware takes care of beaconing.
 153          * The driver only needs to upload a new beacon template, once
 154          * the template was changed by the stack or userspace.
 155          *
 156          * LMAC API 3.2.2 also specifies that the driver does not need
 157          * to cancel the old beacon template by hand, instead the firmware
 158          * will release the previous one through the feedback mechanism.
 159          */
 160         p54_tx_80211(priv->hw, beacon);
 161         priv->tsf_high32 = 0;
 162         priv->tsf_low32 = 0;
 163
 164         return 0;
 165 }
 166
 167 static int p54_start(struct ieee80211_hw *dev)
 168 {
 169         struct p54_common *priv = dev->priv;
 170         int err;
 171
 172         mutex_lock(&priv->conf_mutex);
 173         err = priv->open(dev);
 174         if (err)
 175                 goto out;
 176         P54_SET_QUEUE(priv->qos_params[0], 0x0002, 0x0003, 0x0007, 47);
 177         P54_SET_QUEUE(priv->qos_params[1], 0x0002, 0x0007, 0x000f, 94);
 178         P54_SET_QUEUE(priv->qos_params[2], 0x0003, 0x000f, 0x03ff, 0);
 179         P54_SET_QUEUE(priv->qos_params[3], 0x0007, 0x000f, 0x03ff, 0);
 180         err = p54_set_edcf(priv);
 181         if (err)
 182                 goto out;
 183
 184         memset(priv->bssid, ~0, ETH_ALEN);
 185         priv->mode = NL80211_IFTYPE_MONITOR;
 186         err = p54_setup_mac(priv);
 187         if (err) {
 188                 priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 189                 goto out;
 190         }
 191
 192         ieee80211_queue_delayed_work(dev, &priv->work, 0);
 193
 194         priv->softled_state = 0;
 195         err = p54_set_leds(priv);
 196
 197 out:
 198         mutex_unlock(&priv->conf_mutex);
 199         return err;
 200 }
 201
 202 static void p54_stop(struct ieee80211_hw *dev)
 203 {
 204         struct p54_common *priv = dev->priv;
 205         int i;
 206
 207         mutex_lock(&priv->conf_mutex);
 208         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 209         priv->softled_state = 0;
 210         p54_set_leds(priv);
 211
 212         cancel_delayed_work_sync(&priv->work);
 213
 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
 232         mutex_lock(&priv->conf_mutex);
 233         if (priv->mode != NL80211_IFTYPE_MONITOR) {
 234                 mutex_unlock(&priv->conf_mutex);
 235                 return -EOPNOTSUPP;
 236         }
 237
 238         priv->vif = vif;
 239
 240         switch (vif->type) {
 241         case NL80211_IFTYPE_STATION:
 242         case NL80211_IFTYPE_ADHOC:
 243         case NL80211_IFTYPE_AP:
 244         case NL80211_IFTYPE_MESH_POINT:
 245                 priv->mode = vif->type;
 246                 break;
 247         default:
 248                 mutex_unlock(&priv->conf_mutex);
 249                 return -EOPNOTSUPP;
 250         }
 251
 252         memcpy(priv->mac_addr, vif->addr, ETH_ALEN);
 253         p54_setup_mac(priv);
 254         mutex_unlock(&priv->conf_mutex);
 255         return 0;
 256 }
 257
 258 static void p54_remove_interface(struct ieee80211_hw *dev,
 259                                  struct ieee80211_vif *vif)
 260 {
 261         struct p54_common *priv = dev->priv;
 262
 263         mutex_lock(&priv->conf_mutex);
 264         priv->vif = NULL;
 265
 266         /*
 267          * LMAC API 3.2.2 states that any active beacon template must be
 268          * canceled by the driver before attempting a mode transition.
 269          */
 270         if (le32_to_cpu(priv->beacon_req_id) != 0) {
 271                 p54_tx_cancel(priv, priv->beacon_req_id);
 272                 wait_for_completion_interruptible_timeout(&priv->beacon_comp, HZ);
 273         }
 274         priv->mode = NL80211_IFTYPE_MONITOR;
 275         memset(priv->mac_addr, 0, ETH_ALEN);
 276         memset(priv->bssid, 0, ETH_ALEN);
 277         p54_setup_mac(priv);
 278         mutex_unlock(&priv->conf_mutex);
 279 }
 280
 281 static int p54_config(struct ieee80211_hw *dev, u32 changed)
 282 {
 283         int ret = 0;
 284         struct p54_common *priv = dev->priv;
 285         struct ieee80211_conf *conf = &dev->conf;
 286
 287         mutex_lock(&priv->conf_mutex);
 288         if (changed & IEEE80211_CONF_CHANGE_POWER)
 289                 priv->output_power = conf->power_level << 2;
 290         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 291                 ret = p54_scan(priv, P54_SCAN_EXIT, 0);
 292                 if (ret)
 293                         goto out;
 294         }
 295         if (changed & IEEE80211_CONF_CHANGE_PS) {
 296                 ret = p54_set_ps(priv);
 297                 if (ret)
 298                         goto out;
 299         }
 300         if (changed & IEEE80211_CONF_CHANGE_IDLE) {
 301                 ret = p54_setup_mac(priv);
 302                 if (ret)
 303                         goto out;
 304         }
 305
 306 out:
 307         mutex_unlock(&priv->conf_mutex);
 308         return ret;
 309 }
 310
 311 static void p54_configure_filter(struct ieee80211_hw *dev,
 312                                  unsigned int changed_flags,
 313                                  unsigned int *total_flags,
 314                                  u64 multicast)
 315 {
 316         struct p54_common *priv = dev->priv;
 317
 318         *total_flags &= FIF_PROMISC_IN_BSS |
 319                         FIF_OTHER_BSS;
 320
 321         priv->filter_flags = *total_flags;
 322
 323         if (changed_flags & (FIF_PROMISC_IN_BSS | FIF_OTHER_BSS))
 324                 p54_setup_mac(priv);
 325 }
 326
 327 static int p54_conf_tx(struct ieee80211_hw *dev, u16 queue,
 328                        const struct ieee80211_tx_queue_params *params)
 329 {
 330         struct p54_common *priv = dev->priv;
 331         int ret;
 332
 333         mutex_lock(&priv->conf_mutex);
 334         if (queue < dev->queues) {
 335                 P54_SET_QUEUE(priv->qos_params[queue], params->aifs,
 336                         params->cw_min, params->cw_max, params->txop);
 337                 ret = p54_set_edcf(priv);
 338         } else
 339                 ret = -EINVAL;
 340         mutex_unlock(&priv->conf_mutex);
 341         return ret;
 342 }
 343
 344 static void p54_work(struct work_struct *work)
 345 {
 346         struct p54_common *priv = container_of(work, struct p54_common,
 347                                                work.work);
 348
 349         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
 350                 return ;
 351
 352         /*
 353          * TODO: walk through tx_queue and do the following tasks
 354          *      1. initiate bursts.
 355          *      2. cancel stuck frames / reset the device if necessary.
 356          */
 357
 358         p54_fetch_statistics(priv);
 359 }
 360
 361 static int p54_get_stats(struct ieee80211_hw *dev,
 362                          struct ieee80211_low_level_stats *stats)
 363 {
 364         struct p54_common *priv = dev->priv;
 365
 366         memcpy(stats, &priv->stats, sizeof(*stats));
 367         return 0;
 368 }
 369
 370 static void p54_bss_info_changed(struct ieee80211_hw *dev,
 371                                  struct ieee80211_vif *vif,
 372                                  struct ieee80211_bss_conf *info,
 373                                  u32 changed)
 374 {
 375         struct p54_common *priv = dev->priv;
 376
 377         mutex_lock(&priv->conf_mutex);
 378         if (changed & BSS_CHANGED_BSSID) {
 379                 memcpy(priv->bssid, info->bssid, ETH_ALEN);
 380                 p54_setup_mac(priv);
 381         }
 382
 383         if (changed & BSS_CHANGED_BEACON) {
 384                 p54_scan(priv, P54_SCAN_EXIT, 0);
 385                 p54_setup_mac(priv);
 386                 p54_beacon_update(priv, vif);
 387                 p54_set_edcf(priv);
 388         }
 389
 390         if (changed & (BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BEACON)) {
 391                 priv->use_short_slot = info->use_short_slot;
 392                 p54_set_edcf(priv);
 393         }
 394         if (changed & BSS_CHANGED_BASIC_RATES) {
 395                 if (dev->conf.channel->band == IEEE80211_BAND_5GHZ)
 396                         priv->basic_rate_mask = (info->basic_rates << 4);
 397                 else
 398                         priv->basic_rate_mask = info->basic_rates;
 399                 p54_setup_mac(priv);
 400                 if (priv->fw_var >= 0x500)
 401                         p54_scan(priv, P54_SCAN_EXIT, 0);
 402         }
 403         if (changed & BSS_CHANGED_ASSOC) {
 404                 if (info->assoc) {
 405                         priv->aid = info->aid;
 406                         priv->wakeup_timer = info->beacon_int *
 407                                              info->dtim_period * 5;
 408                         p54_setup_mac(priv);
 409                 } else {
 410                         priv->wakeup_timer = 500;
 411                         priv->aid = 0;
 412                 }
 413         }
 414
 415         mutex_unlock(&priv->conf_mutex);
 416 }
 417
 418 static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
 419                        struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 420                        struct ieee80211_key_conf *key)
 421 {
 422         struct p54_common *priv = dev->priv;
 423         int slot, ret = 0;
 424         u8 algo = 0;
 425         u8 *addr = NULL;
 426
 427         if (modparam_nohwcrypt)
 428                 return -EOPNOTSUPP;
 429
 430         mutex_lock(&priv->conf_mutex);
 431         if (cmd == SET_KEY) {
 432                 switch (key->cipher) {
 433                 case WLAN_CIPHER_SUITE_TKIP:
 434                         if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL |
 435                               BR_DESC_PRIV_CAP_TKIP))) {
 436                                 ret = -EOPNOTSUPP;
 437                                 goto out_unlock;
 438                         }
 439                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 440                         algo = P54_CRYPTO_TKIPMICHAEL;
 441                         break;
 442                 case WLAN_CIPHER_SUITE_WEP40:
 443                 case WLAN_CIPHER_SUITE_WEP104:
 444                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) {
 445                                 ret = -EOPNOTSUPP;
 446                                 goto out_unlock;
 447                         }
 448                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 449                         algo = P54_CRYPTO_WEP;
 450                         break;
 451                 case WLAN_CIPHER_SUITE_CCMP:
 452                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) {
 453                                 ret = -EOPNOTSUPP;
 454                                 goto out_unlock;
 455                         }
 456                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 457                         algo = P54_CRYPTO_AESCCMP;
 458                         break;
 459                 default:
 460                         ret = -EOPNOTSUPP;
 461                         goto out_unlock;
 462                 }
 463                 slot = bitmap_find_free_region(priv->used_rxkeys,
 464                                                priv->rx_keycache_size, 0);
 465
 466                 if (slot < 0) {
 467                         /*
 468                          * The device supports the chosen algorithm, but the
 469                          * firmware does not provide enough key slots to store
 470                          * all of them.
 471                          * But encryption offload for outgoing frames is always
 472                          * possible, so we just pretend that the upload was
 473                          * successful and do the decryption in software.
 474                          */
 475
 476                         /* mark the key as invalid. */
 477                         key->hw_key_idx = 0xff;
 478                         goto out_unlock;
 479                 }
 480         } else {
 481                 slot = key->hw_key_idx;
 482
 483                 if (slot == 0xff) {
 484                         /* This key was not uploaded into the rx key cache. */
 485
 486                         goto out_unlock;
 487                 }
 488
 489                 bitmap_release_region(priv->used_rxkeys, slot, 0);
 490                 algo = 0;
 491         }
 492
 493         if (sta)
 494                 addr = sta->addr;
 495
 496         ret = p54_upload_key(priv, algo, slot, key->keyidx,
 497                              key->keylen, addr, key->key);
 498         if (ret) {
 499                 bitmap_release_region(priv->used_rxkeys, slot, 0);
 500                 ret = -EOPNOTSUPP;
 501                 goto out_unlock;
 502         }
 503
 504         key->hw_key_idx = slot;
 505
 506 out_unlock:
 507         mutex_unlock(&priv->conf_mutex);
 508         return ret;
 509 }
 510
 511 static int p54_get_survey(struct ieee80211_hw *dev, int idx,
 512                                 struct survey_info *survey)
 513 {
 514         struct p54_common *priv = dev->priv;
 515         struct ieee80211_conf *conf = &dev->conf;
 516
 517         if (idx != 0)
 518                 return -ENOENT;
 519
 520         survey->channel = conf->channel;
 521         survey->filled = SURVEY_INFO_NOISE_DBM;
 522         survey->noise = clamp_t(s8, priv->noise, -128, 127);
 523
 524         return 0;
 525 }
 526
 527 static unsigned int p54_flush_count(struct p54_common *priv)
 528 {
 529         unsigned int total = 0, i;
 530
 531         BUILD_BUG_ON(P54_QUEUE_NUM > ARRAY_SIZE(priv->tx_stats));
 532
 533         /*
 534          * Because the firmware has the sole control over any frames
 535          * in the P54_QUEUE_BEACON or P54_QUEUE_SCAN queues, they
 536          * don't really count as pending or active.
 537          */
 538         for (i = P54_QUEUE_MGMT; i < P54_QUEUE_NUM; i++)
 539                 total += priv->tx_stats[i].len;
 540         return total;
 541 }
 542
 543 static void p54_flush(struct ieee80211_hw *dev, bool drop)
 544 {
 545         struct p54_common *priv = dev->priv;
 546         unsigned int total, i;
 547
 548         /*
 549          * Currently, it wouldn't really matter if we wait for one second
 550          * or 15 minutes. But once someone gets around and completes the
 551          * TODOs [ancel stuck frames / reset device] in p54_work, it will
 552          * suddenly make sense to wait that long.
 553          */
 554         i = P54_STATISTICS_UPDATE * 2 / 20;
 555
 556         /*
 557          * In this case no locking is required because as we speak the
 558          * queues have already been stopped and no new frames can sneak
 559          * up from behind.
 560          */
 561         while ((total = p54_flush_count(priv) && i--)) {
 562                 /* waste time */
 563                 msleep(20);
 564         }
 565
 566         WARN(total, "tx flush timeout, unresponsive firmware");
 567 }
 568
 569 static void p54_set_coverage_class(struct ieee80211_hw *dev, u8 coverage_class)
 570 {
 571         struct p54_common *priv = dev->priv;
 572
 573         mutex_lock(&priv->conf_mutex);
 574         /* support all coverage class values as in 802.11-2007 Table 7-27 */
 575         priv->coverage_class = clamp_t(u8, coverage_class, 0, 31);
 576         p54_set_edcf(priv);
 577         mutex_unlock(&priv->conf_mutex);
 578 }
 579
 580 static const struct ieee80211_ops p54_ops = {
 581         .tx                     = p54_tx_80211,
 582         .start                  = p54_start,
 583         .stop                   = p54_stop,
 584         .add_interface          = p54_add_interface,
 585         .remove_interface       = p54_remove_interface,
 586         .set_tim                = p54_set_tim,
 587         .sta_notify             = p54_sta_notify,
 588         .sta_add                = p54_sta_add_remove,
 589         .sta_remove             = p54_sta_add_remove,
 590         .set_key                = p54_set_key,
 591         .config                 = p54_config,
 592         .flush                  = p54_flush,
 593         .bss_info_changed       = p54_bss_info_changed,
 594         .configure_filter       = p54_configure_filter,
 595         .conf_tx                = p54_conf_tx,
 596         .get_stats              = p54_get_stats,
 597         .get_survey             = p54_get_survey,
 598         .set_coverage_class     = p54_set_coverage_class,
 599 };
 600
 601 struct ieee80211_hw *p54_init_common(size_t priv_data_len)
 602 {
 603         struct ieee80211_hw *dev;
 604         struct p54_common *priv;
 605
 606         dev = ieee80211_alloc_hw(priv_data_len, &p54_ops);
 607         if (!dev)
 608                 return NULL;
 609
 610         priv = dev->priv;
 611         priv->hw = dev;
 612         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 613         priv->basic_rate_mask = 0x15f;
 614         spin_lock_init(&priv->tx_stats_lock);
 615         skb_queue_head_init(&priv->tx_queue);
 616         skb_queue_head_init(&priv->tx_pending);
 617         dev->flags = IEEE80211_HW_RX_INCLUDES_FCS |
 618                      IEEE80211_HW_SIGNAL_DBM |
 619                      IEEE80211_HW_SUPPORTS_PS |
 620                      IEEE80211_HW_PS_NULLFUNC_STACK |
 621                      IEEE80211_HW_BEACON_FILTER |
 622                      IEEE80211_HW_REPORTS_TX_ACK_STATUS;
 623
 624         dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
 625                                       BIT(NL80211_IFTYPE_ADHOC) |
 626                                       BIT(NL80211_IFTYPE_AP) |
 627                                       BIT(NL80211_IFTYPE_MESH_POINT);
 628
 629         dev->channel_change_time = 1000;        /* TODO: find actual value */
 630         priv->beacon_req_id = cpu_to_le32(0);
 631         priv->tx_stats[P54_QUEUE_BEACON].limit = 1;
 632         priv->tx_stats[P54_QUEUE_FWSCAN].limit = 1;
 633         priv->tx_stats[P54_QUEUE_MGMT].limit = 3;
 634         priv->tx_stats[P54_QUEUE_CAB].limit = 3;
 635         priv->tx_stats[P54_QUEUE_DATA].limit = 5;
 636         dev->queues = 1;
 637         priv->noise = -94;
 638         /*
 639          * We support at most 8 tries no matter which rate they're at,
 640          * we cannot support max_rates * max_rate_tries as we set it
 641          * here, but setting it correctly to 4/2 or so would limit us
 642          * artificially if the RC algorithm wants just two rates, so
 643          * let's say 4/7, we'll redistribute it at TX time, see the
 644          * comments there.
 645          */
 646         dev->max_rates = 4;
 647         dev->max_rate_tries = 7;
 648         dev->extra_tx_headroom = sizeof(struct p54_hdr) + 4 +
 649                                  sizeof(struct p54_tx_data);
 650
 651         /*
 652          * For now, disable PS by default because it affects
 653          * link stability significantly.
 654          */
 655         dev->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
 656
 657         mutex_init(&priv->conf_mutex);
 658         mutex_init(&priv->eeprom_mutex);
 659         init_completion(&priv->eeprom_comp);
 660         init_completion(&priv->beacon_comp);
 661         INIT_DELAYED_WORK(&priv->work, p54_work);
 662
 663         return dev;
 664 }
 665 EXPORT_SYMBOL_GPL(p54_init_common);
 666
 667 int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
 668 {
 669         struct p54_common __maybe_unused *priv = dev->priv;
 670         int err;
 671
 672         err = ieee80211_register_hw(dev);
 673         if (err) {
 674                 dev_err(pdev, "Cannot register device (%d).\n", err);
 675                 return err;
 676         }
 677
 678 #ifdef CONFIG_P54_LEDS
 679         err = p54_init_leds(priv);
 680         if (err)
 681                 return err;
 682 #endif /* CONFIG_P54_LEDS */
 683
 684         dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy));
 685         return 0;
 686 }
 687 EXPORT_SYMBOL_GPL(p54_register_common);
 688
 689 void p54_free_common(struct ieee80211_hw *dev)
 690 {
 691         struct p54_common *priv = dev->priv;
 692         unsigned int i;
 693
 694         for (i = 0; i < IEEE80211_NUM_BANDS; i++)
 695                 kfree(priv->band_table[i]);
 696
 697         kfree(priv->iq_autocal);
 698         kfree(priv->output_limit);
 699         kfree(priv->curve_data);
 700         kfree(priv->rssi_db);
 701         kfree(priv->used_rxkeys);
 702         priv->iq_autocal = NULL;
 703         priv->output_limit = NULL;
 704         priv->curve_data = NULL;
 705         priv->rssi_db = NULL;
 706         priv->used_rxkeys = NULL;
 707         ieee80211_free_hw(dev);
 708 }
 709 EXPORT_SYMBOL_GPL(p54_free_common);
 710
 711 void p54_unregister_common(struct ieee80211_hw *dev)
 712 {
 713         struct p54_common *priv = dev->priv;
 714
 715 #ifdef CONFIG_P54_LEDS
 716         p54_unregister_leds(priv);
 717 #endif /* CONFIG_P54_LEDS */
 718
 719         ieee80211_unregister_hw(dev);
 720         mutex_destroy(&priv->conf_mutex);
 721         mutex_destroy(&priv->eeprom_mutex);
 722 }
 723 EXPORT_SYMBOL_GPL(p54_unregister_common);