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/firmware.h>
  21 #include <linux/etherdevice.h>
  22
  23 #include <net/mac80211.h>
  24
  25 #include "p54.h"
  26 #include "lmac.h"
  27
  28 static int modparam_nohwcrypt;
  29 module_param_named(nohwcrypt, modparam_nohwcrypt, bool, S_IRUGO);
  30 MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");
  31 MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
  32 MODULE_DESCRIPTION("Softmac Prism54 common code");
  33 MODULE_LICENSE("GPL");
  34 MODULE_ALIAS("prism54common");
  35
  36 static void p54_sta_notify(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
  37                               enum sta_notify_cmd notify_cmd,
  38                               struct ieee80211_sta *sta)
  39 {
  40         struct p54_common *priv = dev->priv;
  41         switch (notify_cmd) {
  42         case STA_NOTIFY_ADD:
  43         case STA_NOTIFY_REMOVE:
  44                 /*
  45                  * Notify the firmware that we don't want or we don't
  46                  * need to buffer frames for this station anymore.
  47                  */
  48
  49                 p54_sta_unlock(priv, sta->addr);
  50                 break;
  51         case STA_NOTIFY_AWAKE:
  52                 /* update the firmware's filter table */
  53                 p54_sta_unlock(priv, sta->addr);
  54                 break;
  55         default:
  56                 break;
  57         }
  58 }
  59
  60 static int p54_set_tim(struct ieee80211_hw *dev, struct ieee80211_sta *sta,
  61                         bool set)
  62 {
  63         struct p54_common *priv = dev->priv;
  64
  65         return p54_update_beacon_tim(priv, sta->aid, set);
  66 }
  67
  68 static int p54_beacon_format_ie_tim(struct sk_buff *skb)
  69 {
  70         /*
  71          * the good excuse for this mess is ... the firmware.
  72          * The dummy TIM MUST be at the end of the beacon frame,
  73          * because it'll be overwritten!
  74          */
  75
  76         struct ieee80211_mgmt *mgmt = (void *)skb->data;
  77         u8 *pos, *end;
  78
  79         if (skb->len <= sizeof(mgmt))
  80                 return -EINVAL;
  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 -EINVAL;
  87
  88                 if (pos[0] == WLAN_EID_TIM) {
  89                         u8 dtim_len = pos[1];
  90                         u8 dtim_period = pos[3];
  91                         u8 *next = pos + 2 + dtim_len;
  92
  93                         if (dtim_len < 3)
  94                                 return -EINVAL;
  95
  96                         memmove(pos, next, end - next);
  97
  98                         if (dtim_len > 3)
  99                                 skb_trim(skb, skb->len - (dtim_len - 3));
 100
 101                         pos = end - (dtim_len + 2);
 102
 103                         /* add the dummy at the end */
 104                         pos[0] = WLAN_EID_TIM;
 105                         pos[1] = 3;
 106                         pos[2] = 0;
 107                         pos[3] = dtim_period;
 108                         pos[4] = 0;
 109                         return 0;
 110                 }
 111                 pos += 2 + pos[1];
 112         }
 113         return 0;
 114 }
 115
 116 static int p54_beacon_update(struct p54_common *priv,
 117                         struct ieee80211_vif *vif)
 118 {
 119         struct sk_buff *beacon;
 120         __le32 old_beacon_req_id;
 121         int ret;
 122
 123         beacon = ieee80211_beacon_get(priv->hw, vif);
 124         if (!beacon)
 125                 return -ENOMEM;
 126         ret = p54_beacon_format_ie_tim(beacon);
 127         if (ret)
 128                 return ret;
 129
 130         old_beacon_req_id = priv->beacon_req_id;
 131         priv->beacon_req_id = GET_REQ_ID(beacon);
 132
 133         ret = p54_tx_80211(priv->hw, beacon);
 134         if (ret) {
 135                 priv->beacon_req_id = old_beacon_req_id;
 136                 return -ENOSPC;
 137         }
 138
 139         priv->tsf_high32 = 0;
 140         priv->tsf_low32 = 0;
 141
 142         return 0;
 143 }
 144
 145 static int p54_start(struct ieee80211_hw *dev)
 146 {
 147         struct p54_common *priv = dev->priv;
 148         int err;
 149
 150         mutex_lock(&priv->conf_mutex);
 151         err = priv->open(dev);
 152         if (err)
 153                 goto out;
 154         P54_SET_QUEUE(priv->qos_params[0], 0x0002, 0x0003, 0x0007, 47);
 155         P54_SET_QUEUE(priv->qos_params[1], 0x0002, 0x0007, 0x000f, 94);
 156         P54_SET_QUEUE(priv->qos_params[2], 0x0003, 0x000f, 0x03ff, 0);
 157         P54_SET_QUEUE(priv->qos_params[3], 0x0007, 0x000f, 0x03ff, 0);
 158         err = p54_set_edcf(priv);
 159         if (err)
 160                 goto out;
 161
 162         memset(priv->bssid, ~0, ETH_ALEN);
 163         priv->mode = NL80211_IFTYPE_MONITOR;
 164         err = p54_setup_mac(priv);
 165         if (err) {
 166                 priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 167                 goto out;
 168         }
 169
 170         queue_delayed_work(dev->workqueue, &priv->work, 0);
 171
 172         priv->softled_state = 0;
 173         err = p54_set_leds(priv);
 174
 175 out:
 176         mutex_unlock(&priv->conf_mutex);
 177         return err;
 178 }
 179
 180 static void p54_stop(struct ieee80211_hw *dev)
 181 {
 182         struct p54_common *priv = dev->priv;
 183         int i;
 184
 185         mutex_lock(&priv->conf_mutex);
 186         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 187         priv->softled_state = 0;
 188         p54_set_leds(priv);
 189
 190         cancel_delayed_work_sync(&priv->work);
 191
 192         priv->stop(dev);
 193         skb_queue_purge(&priv->tx_pending);
 194         skb_queue_purge(&priv->tx_queue);
 195         for (i = 0; i < P54_QUEUE_NUM; i++) {
 196                 priv->tx_stats[i].count = 0;
 197                 priv->tx_stats[i].len = 0;
 198         }
 199
 200         priv->beacon_req_id = cpu_to_le32(0);
 201         priv->tsf_high32 = priv->tsf_low32 = 0;
 202         mutex_unlock(&priv->conf_mutex);
 203 }
 204
 205 static int p54_add_interface(struct ieee80211_hw *dev,
 206                              struct ieee80211_if_init_conf *conf)
 207 {
 208         struct p54_common *priv = dev->priv;
 209
 210         mutex_lock(&priv->conf_mutex);
 211         if (priv->mode != NL80211_IFTYPE_MONITOR) {
 212                 mutex_unlock(&priv->conf_mutex);
 213                 return -EOPNOTSUPP;
 214         }
 215
 216         priv->vif = conf->vif;
 217
 218         switch (conf->type) {
 219         case NL80211_IFTYPE_STATION:
 220         case NL80211_IFTYPE_ADHOC:
 221         case NL80211_IFTYPE_AP:
 222         case NL80211_IFTYPE_MESH_POINT:
 223                 priv->mode = conf->type;
 224                 break;
 225         default:
 226                 mutex_unlock(&priv->conf_mutex);
 227                 return -EOPNOTSUPP;
 228         }
 229
 230         memcpy(priv->mac_addr, conf->mac_addr, ETH_ALEN);
 231         p54_setup_mac(priv);
 232         mutex_unlock(&priv->conf_mutex);
 233         return 0;
 234 }
 235
 236 static void p54_remove_interface(struct ieee80211_hw *dev,
 237                                  struct ieee80211_if_init_conf *conf)
 238 {
 239         struct p54_common *priv = dev->priv;
 240
 241         mutex_lock(&priv->conf_mutex);
 242         priv->vif = NULL;
 243         if (priv->beacon_req_id) {
 244                 p54_tx_cancel(priv, priv->beacon_req_id);
 245                 priv->beacon_req_id = cpu_to_le32(0);
 246         }
 247         priv->mode = NL80211_IFTYPE_MONITOR;
 248         memset(priv->mac_addr, 0, ETH_ALEN);
 249         memset(priv->bssid, 0, ETH_ALEN);
 250         p54_setup_mac(priv);
 251         mutex_unlock(&priv->conf_mutex);
 252 }
 253
 254 static int p54_config(struct ieee80211_hw *dev, u32 changed)
 255 {
 256         int ret = 0;
 257         struct p54_common *priv = dev->priv;
 258         struct ieee80211_conf *conf = &dev->conf;
 259
 260         mutex_lock(&priv->conf_mutex);
 261         if (changed & IEEE80211_CONF_CHANGE_POWER)
 262                 priv->output_power = conf->power_level << 2;
 263         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 264                 ret = p54_scan(priv, P54_SCAN_EXIT, 0);
 265                 if (ret)
 266                         goto out;
 267         }
 268         if (changed & IEEE80211_CONF_CHANGE_PS) {
 269                 ret = p54_set_ps(priv);
 270                 if (ret)
 271                         goto out;
 272         }
 273
 274 out:
 275         mutex_unlock(&priv->conf_mutex);
 276         return ret;
 277 }
 278
 279 static void p54_configure_filter(struct ieee80211_hw *dev,
 280                                  unsigned int changed_flags,
 281                                  unsigned int *total_flags,
 282                                  int mc_count, struct dev_mc_list *mclist)
 283 {
 284         struct p54_common *priv = dev->priv;
 285
 286         *total_flags &= FIF_PROMISC_IN_BSS |
 287                         FIF_OTHER_BSS;
 288
 289         priv->filter_flags = *total_flags;
 290
 291         if (changed_flags & (FIF_PROMISC_IN_BSS | FIF_OTHER_BSS))
 292                 p54_setup_mac(priv);
 293 }
 294
 295 static int p54_conf_tx(struct ieee80211_hw *dev, u16 queue,
 296                        const struct ieee80211_tx_queue_params *params)
 297 {
 298         struct p54_common *priv = dev->priv;
 299         int ret;
 300
 301         mutex_lock(&priv->conf_mutex);
 302         if ((params) && !(queue > 4)) {
 303                 P54_SET_QUEUE(priv->qos_params[queue], params->aifs,
 304                         params->cw_min, params->cw_max, params->txop);
 305                 ret = p54_set_edcf(priv);
 306         } else
 307                 ret = -EINVAL;
 308         mutex_unlock(&priv->conf_mutex);
 309         return ret;
 310 }
 311
 312 static void p54_work(struct work_struct *work)
 313 {
 314         struct p54_common *priv = container_of(work, struct p54_common,
 315                                                work.work);
 316
 317         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
 318                 return ;
 319
 320         /*
 321          * TODO: walk through tx_queue and do the following tasks
 322          *      1. initiate bursts.
 323          *      2. cancel stuck frames / reset the device if necessary.
 324          */
 325
 326         p54_fetch_statistics(priv);
 327 }
 328
 329 static int p54_get_stats(struct ieee80211_hw *dev,
 330                          struct ieee80211_low_level_stats *stats)
 331 {
 332         struct p54_common *priv = dev->priv;
 333
 334         memcpy(stats, &priv->stats, sizeof(*stats));
 335         return 0;
 336 }
 337
 338 static int p54_get_tx_stats(struct ieee80211_hw *dev,
 339                             struct ieee80211_tx_queue_stats *stats)
 340 {
 341         struct p54_common *priv = dev->priv;
 342
 343         memcpy(stats, &priv->tx_stats[P54_QUEUE_DATA],
 344                sizeof(stats[0]) * dev->queues);
 345         return 0;
 346 }
 347
 348 static void p54_bss_info_changed(struct ieee80211_hw *dev,
 349                                  struct ieee80211_vif *vif,
 350                                  struct ieee80211_bss_conf *info,
 351                                  u32 changed)
 352 {
 353         struct p54_common *priv = dev->priv;
 354
 355         mutex_lock(&priv->conf_mutex);
 356         if (changed & BSS_CHANGED_BSSID) {
 357                 memcpy(priv->bssid, info->bssid, ETH_ALEN);
 358                 p54_setup_mac(priv);
 359         }
 360
 361         if (changed & BSS_CHANGED_BEACON) {
 362                 p54_scan(priv, P54_SCAN_EXIT, 0);
 363                 p54_setup_mac(priv);
 364                 p54_beacon_update(priv, vif);
 365                 p54_set_edcf(priv);
 366         }
 367
 368         if (changed & (BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BEACON)) {
 369                 priv->use_short_slot = info->use_short_slot;
 370                 p54_set_edcf(priv);
 371         }
 372         if (changed & BSS_CHANGED_BASIC_RATES) {
 373                 if (dev->conf.channel->band == IEEE80211_BAND_5GHZ)
 374                         priv->basic_rate_mask = (info->basic_rates << 4);
 375                 else
 376                         priv->basic_rate_mask = info->basic_rates;
 377                 p54_setup_mac(priv);
 378                 if (priv->fw_var >= 0x500)
 379                         p54_scan(priv, P54_SCAN_EXIT, 0);
 380         }
 381         if (changed & BSS_CHANGED_ASSOC) {
 382                 if (info->assoc) {
 383                         priv->aid = info->aid;
 384                         priv->wakeup_timer = info->beacon_int *
 385                                              info->dtim_period * 5;
 386                         p54_setup_mac(priv);
 387                 }
 388         }
 389
 390         mutex_unlock(&priv->conf_mutex);
 391 }
 392
 393 static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
 394                        struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 395                        struct ieee80211_key_conf *key)
 396 {
 397         struct p54_common *priv = dev->priv;
 398         int slot, ret = 0;
 399         u8 algo = 0;
 400         u8 *addr = NULL;
 401
 402         if (modparam_nohwcrypt)
 403                 return -EOPNOTSUPP;
 404
 405         mutex_lock(&priv->conf_mutex);
 406         if (cmd == SET_KEY) {
 407                 switch (key->alg) {
 408                 case ALG_TKIP:
 409                         if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL |
 410                               BR_DESC_PRIV_CAP_TKIP))) {
 411                                 ret = -EOPNOTSUPP;
 412                                 goto out_unlock;
 413                         }
 414                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 415                         algo = P54_CRYPTO_TKIPMICHAEL;
 416                         break;
 417                 case ALG_WEP:
 418                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) {
 419                                 ret = -EOPNOTSUPP;
 420                                 goto out_unlock;
 421                         }
 422                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 423                         algo = P54_CRYPTO_WEP;
 424                         break;
 425                 case ALG_CCMP:
 426                         if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) {
 427                                 ret = -EOPNOTSUPP;
 428                                 goto out_unlock;
 429                         }
 430                         key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 431                         algo = P54_CRYPTO_AESCCMP;
 432                         break;
 433                 default:
 434                         ret = -EOPNOTSUPP;
 435                         goto out_unlock;
 436                 }
 437                 slot = bitmap_find_free_region(priv->used_rxkeys,
 438                                                priv->rx_keycache_size, 0);
 439
 440                 if (slot < 0) {
 441                         /*
 442                          * The device supports the choosen algorithm, but the
 443                          * firmware does not provide enough key slots to store
 444                          * all of them.
 445                          * But encryption offload for outgoing frames is always
 446                          * possible, so we just pretend that the upload was
 447                          * successful and do the decryption in software.
 448                          */
 449
 450                         /* mark the key as invalid. */
 451                         key->hw_key_idx = 0xff;
 452                         goto out_unlock;
 453                 }
 454         } else {
 455                 slot = key->hw_key_idx;
 456
 457                 if (slot == 0xff) {
 458                         /* This key was not uploaded into the rx key cache. */
 459
 460                         goto out_unlock;
 461                 }
 462
 463                 bitmap_release_region(priv->used_rxkeys, slot, 0);
 464                 algo = 0;
 465         }
 466
 467         if (sta)
 468                 addr = sta->addr;
 469
 470         ret = p54_upload_key(priv, algo, slot, key->keyidx,
 471                              key->keylen, addr, key->key);
 472         if (ret) {
 473                 bitmap_release_region(priv->used_rxkeys, slot, 0);
 474                 ret = -EOPNOTSUPP;
 475                 goto out_unlock;
 476         }
 477
 478         key->hw_key_idx = slot;
 479
 480 out_unlock:
 481         mutex_unlock(&priv->conf_mutex);
 482         return ret;
 483 }
 484
 485 static const struct ieee80211_ops p54_ops = {
 486         .tx                     = p54_tx_80211,
 487         .start                  = p54_start,
 488         .stop                   = p54_stop,
 489         .add_interface          = p54_add_interface,
 490         .remove_interface       = p54_remove_interface,
 491         .set_tim                = p54_set_tim,
 492         .sta_notify             = p54_sta_notify,
 493         .set_key                = p54_set_key,
 494         .config                 = p54_config,
 495         .bss_info_changed       = p54_bss_info_changed,
 496         .configure_filter       = p54_configure_filter,
 497         .conf_tx                = p54_conf_tx,
 498         .get_stats              = p54_get_stats,
 499         .get_tx_stats           = p54_get_tx_stats
 500 };
 501
 502 struct ieee80211_hw *p54_init_common(size_t priv_data_len)
 503 {
 504         struct ieee80211_hw *dev;
 505         struct p54_common *priv;
 506
 507         dev = ieee80211_alloc_hw(priv_data_len, &p54_ops);
 508         if (!dev)
 509                 return NULL;
 510
 511         priv = dev->priv;
 512         priv->hw = dev;
 513         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
 514         priv->basic_rate_mask = 0x15f;
 515         spin_lock_init(&priv->tx_stats_lock);
 516         skb_queue_head_init(&priv->tx_queue);
 517         skb_queue_head_init(&priv->tx_pending);
 518         dev->flags = IEEE80211_HW_RX_INCLUDES_FCS |
 519                      IEEE80211_HW_SIGNAL_DBM |
 520                      IEEE80211_HW_NOISE_DBM;
 521
 522         dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
 523                                       BIT(NL80211_IFTYPE_ADHOC) |
 524                                       BIT(NL80211_IFTYPE_AP) |
 525                                       BIT(NL80211_IFTYPE_MESH_POINT);
 526
 527         dev->channel_change_time = 1000;        /* TODO: find actual value */
 528         priv->tx_stats[P54_QUEUE_BEACON].limit = 1;
 529         priv->tx_stats[P54_QUEUE_FWSCAN].limit = 1;
 530         priv->tx_stats[P54_QUEUE_MGMT].limit = 3;
 531         priv->tx_stats[P54_QUEUE_CAB].limit = 3;
 532         priv->tx_stats[P54_QUEUE_DATA].limit = 5;
 533         dev->queues = 1;
 534         priv->noise = -94;
 535         /*
 536          * We support at most 8 tries no matter which rate they're at,
 537          * we cannot support max_rates * max_rate_tries as we set it
 538          * here, but setting it correctly to 4/2 or so would limit us
 539          * artificially if the RC algorithm wants just two rates, so
 540          * let's say 4/7, we'll redistribute it at TX time, see the
 541          * comments there.
 542          */
 543         dev->max_rates = 4;
 544         dev->max_rate_tries = 7;
 545         dev->extra_tx_headroom = sizeof(struct p54_hdr) + 4 +
 546                                  sizeof(struct p54_tx_data);
 547
 548         mutex_init(&priv->conf_mutex);
 549         mutex_init(&priv->eeprom_mutex);
 550         init_completion(&priv->eeprom_comp);
 551         INIT_DELAYED_WORK(&priv->work, p54_work);
 552
 553         return dev;
 554 }
 555 EXPORT_SYMBOL_GPL(p54_init_common);
 556
 557 int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
 558 {
 559         struct p54_common *priv = dev->priv;
 560         int err;
 561
 562         err = ieee80211_register_hw(dev);
 563         if (err) {
 564                 dev_err(pdev, "Cannot register device (%d).\n", err);
 565                 return err;
 566         }
 567
 568 #ifdef CONFIG_P54_LEDS
 569         err = p54_init_leds(priv);
 570         if (err)
 571                 return err;
 572 #endif /* CONFIG_P54_LEDS */
 573
 574         dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy));
 575         return 0;
 576 }
 577 EXPORT_SYMBOL_GPL(p54_register_common);
 578
 579 void p54_free_common(struct ieee80211_hw *dev)
 580 {
 581         struct p54_common *priv = dev->priv;
 582
 583         kfree(priv->iq_autocal);
 584         kfree(priv->output_limit);
 585         kfree(priv->curve_data);
 586         kfree(priv->used_rxkeys);
 587         priv->iq_autocal = NULL;
 588         priv->output_limit = NULL;
 589         priv->curve_data = NULL;
 590         priv->used_rxkeys = NULL;
 591         ieee80211_free_hw(dev);
 592 }
 593 EXPORT_SYMBOL_GPL(p54_free_common);
 594
 595 void p54_unregister_common(struct ieee80211_hw *dev)
 596 {
 597         struct p54_common *priv = dev->priv;
 598
 599 #ifdef CONFIG_P54_LEDS
 600         p54_unregister_leds(priv);
 601 #endif /* CONFIG_P54_LEDS */
 602
 603         ieee80211_unregister_hw(dev);
 604         mutex_destroy(&priv->conf_mutex);
 605         mutex_destroy(&priv->eeprom_mutex);
 606 }
 607 EXPORT_SYMBOL_GPL(p54_unregister_common);