drivers/net/wireless/rt2x00/rt2x00dev.c

   1 /*
   2         Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00lib
  23         Abstract: rt2x00 generic device routines.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28
  29 #include "rt2x00.h"
  30 #include "rt2x00lib.h"
  31 #include "rt2x00dump.h"
  32
  33 /*
  34  * Link tuning handlers
  35  */
  36 void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
  37 {
  38         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
  39                 return;
  40
  41         /*
  42          * Reset link information.
  43          * Both the currently active vgc level as well as
  44          * the link tuner counter should be reset. Resetting
  45          * the counter is important for devices where the
  46          * device should only perform link tuning during the
  47          * first minute after being enabled.
  48          */
  49         rt2x00dev->link.count = 0;
  50         rt2x00dev->link.vgc_level = 0;
  51
  52         /*
  53          * Reset the link tuner.
  54          */
  55         rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
  56 }
  57
  58 static void rt2x00lib_start_link_tuner(struct rt2x00_dev *rt2x00dev)
  59 {
  60         /*
  61          * Clear all (possibly) pre-existing quality statistics.
  62          */
  63         memset(&rt2x00dev->link.qual, 0, sizeof(rt2x00dev->link.qual));
  64
  65         /*
  66          * The RX and TX percentage should start at 50%
  67          * this will assure we will get at least get some
  68          * decent value when the link tuner starts.
  69          * The value will be dropped and overwritten with
  70          * the correct (measured )value anyway during the
  71          * first run of the link tuner.
  72          */
  73         rt2x00dev->link.qual.rx_percentage = 50;
  74         rt2x00dev->link.qual.tx_percentage = 50;
  75
  76         rt2x00lib_reset_link_tuner(rt2x00dev);
  77
  78         queue_delayed_work(rt2x00dev->hw->workqueue,
  79                            &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
  80 }
  81
  82 static void rt2x00lib_stop_link_tuner(struct rt2x00_dev *rt2x00dev)
  83 {
  84         cancel_delayed_work_sync(&rt2x00dev->link.work);
  85 }
  86
  87 /*
  88  * Radio control handlers.
  89  */
  90 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  91 {
  92         int status;
  93
  94         /*
  95          * Don't enable the radio twice.
  96          * And check if the hardware button has been disabled.
  97          */
  98         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
  99             test_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags))
 100                 return 0;
 101
 102         /*
 103          * Initialize all data queues.
 104          */
 105         rt2x00queue_init_rx(rt2x00dev);
 106         rt2x00queue_init_tx(rt2x00dev);
 107
 108         /*
 109          * Enable radio.
 110          */
 111         status = rt2x00dev->ops->lib->set_device_state(rt2x00dev,
 112                                                        STATE_RADIO_ON);
 113         if (status)
 114                 return status;
 115
 116         __set_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags);
 117
 118         /*
 119          * Enable RX.
 120          */
 121         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 122
 123         /*
 124          * Start the TX queues.
 125          */
 126         ieee80211_start_queues(rt2x00dev->hw);
 127
 128         return 0;
 129 }
 130
 131 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
 132 {
 133         if (!__test_and_clear_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 134                 return;
 135
 136         /*
 137          * Stop all scheduled work.
 138          */
 139         if (work_pending(&rt2x00dev->intf_work))
 140                 cancel_work_sync(&rt2x00dev->intf_work);
 141         if (work_pending(&rt2x00dev->filter_work))
 142                 cancel_work_sync(&rt2x00dev->filter_work);
 143
 144         /*
 145          * Stop the TX queues.
 146          */
 147         ieee80211_stop_queues(rt2x00dev->hw);
 148
 149         /*
 150          * Disable RX.
 151          */
 152         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 153
 154         /*
 155          * Disable radio.
 156          */
 157         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 158 }
 159
 160 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 161 {
 162         /*
 163          * When we are disabling the RX, we should also stop the link tuner.
 164          */
 165         if (state == STATE_RADIO_RX_OFF)
 166                 rt2x00lib_stop_link_tuner(rt2x00dev);
 167
 168         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 169
 170         /*
 171          * When we are enabling the RX, we should also start the link tuner.
 172          */
 173         if (state == STATE_RADIO_RX_ON &&
 174             (rt2x00dev->intf_ap_count || rt2x00dev->intf_sta_count))
 175                 rt2x00lib_start_link_tuner(rt2x00dev);
 176 }
 177
 178 static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev *rt2x00dev)
 179 {
 180         enum antenna rx = rt2x00dev->link.ant.active.rx;
 181         enum antenna tx = rt2x00dev->link.ant.active.tx;
 182         int sample_a =
 183             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_A);
 184         int sample_b =
 185             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_B);
 186
 187         /*
 188          * We are done sampling. Now we should evaluate the results.
 189          */
 190         rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
 191
 192         /*
 193          * During the last period we have sampled the RSSI
 194          * from both antenna's. It now is time to determine
 195          * which antenna demonstrated the best performance.
 196          * When we are already on the antenna with the best
 197          * performance, then there really is nothing for us
 198          * left to do.
 199          */
 200         if (sample_a == sample_b)
 201                 return;
 202
 203         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 204                 rx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 205
 206         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 207                 tx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 208
 209         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 210 }
 211
 212 static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
 213 {
 214         enum antenna rx = rt2x00dev->link.ant.active.rx;
 215         enum antenna tx = rt2x00dev->link.ant.active.tx;
 216         int rssi_curr = rt2x00_get_link_ant_rssi(&rt2x00dev->link);
 217         int rssi_old = rt2x00_update_ant_rssi(&rt2x00dev->link, rssi_curr);
 218
 219         /*
 220          * Legacy driver indicates that we should swap antenna's
 221          * when the difference in RSSI is greater that 5. This
 222          * also should be done when the RSSI was actually better
 223          * then the previous sample.
 224          * When the difference exceeds the threshold we should
 225          * sample the rssi from the other antenna to make a valid
 226          * comparison between the 2 antennas.
 227          */
 228         if (abs(rssi_curr - rssi_old) < 5)
 229                 return;
 230
 231         rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;
 232
 233         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 234                 rx = (rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 235
 236         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 237                 tx = (tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 238
 239         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 240 }
 241
 242 static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
 243 {
 244         /*
 245          * Determine if software diversity is enabled for
 246          * either the TX or RX antenna (or both).
 247          * Always perform this check since within the link
 248          * tuner interval the configuration might have changed.
 249          */
 250         rt2x00dev->link.ant.flags &= ~ANTENNA_RX_DIVERSITY;
 251         rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;
 252
 253         if (rt2x00dev->hw->conf.antenna_sel_rx == 0 &&
 254             rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY)
 255                 rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
 256         if (rt2x00dev->hw->conf.antenna_sel_tx == 0 &&
 257             rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY)
 258                 rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;
 259
 260         if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&
 261             !(rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)) {
 262                 rt2x00dev->link.ant.flags = 0;
 263                 return;
 264         }
 265
 266         /*
 267          * If we have only sampled the data over the last period
 268          * we should now harvest the data. Otherwise just evaluate
 269          * the data. The latter should only be performed once
 270          * every 2 seconds.
 271          */
 272         if (rt2x00dev->link.ant.flags & ANTENNA_MODE_SAMPLE)
 273                 rt2x00lib_evaluate_antenna_sample(rt2x00dev);
 274         else if (rt2x00dev->link.count & 1)
 275                 rt2x00lib_evaluate_antenna_eval(rt2x00dev);
 276 }
 277
 278 static void rt2x00lib_update_link_stats(struct link *link, int rssi)
 279 {
 280         int avg_rssi = rssi;
 281
 282         /*
 283          * Update global RSSI
 284          */
 285         if (link->qual.avg_rssi)
 286                 avg_rssi = MOVING_AVERAGE(link->qual.avg_rssi, rssi, 8);
 287         link->qual.avg_rssi = avg_rssi;
 288
 289         /*
 290          * Update antenna RSSI
 291          */
 292         if (link->ant.rssi_ant)
 293                 rssi = MOVING_AVERAGE(link->ant.rssi_ant, rssi, 8);
 294         link->ant.rssi_ant = rssi;
 295 }
 296
 297 static void rt2x00lib_precalculate_link_signal(struct link_qual *qual)
 298 {
 299         if (qual->rx_failed || qual->rx_success)
 300                 qual->rx_percentage =
 301                     (qual->rx_success * 100) /
 302                     (qual->rx_failed + qual->rx_success);
 303         else
 304                 qual->rx_percentage = 50;
 305
 306         if (qual->tx_failed || qual->tx_success)
 307                 qual->tx_percentage =
 308                     (qual->tx_success * 100) /
 309                     (qual->tx_failed + qual->tx_success);
 310         else
 311                 qual->tx_percentage = 50;
 312
 313         qual->rx_success = 0;
 314         qual->rx_failed = 0;
 315         qual->tx_success = 0;
 316         qual->tx_failed = 0;
 317 }
 318
 319 static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
 320                                            int rssi)
 321 {
 322         int rssi_percentage = 0;
 323         int signal;
 324
 325         /*
 326          * We need a positive value for the RSSI.
 327          */
 328         if (rssi < 0)
 329                 rssi += rt2x00dev->rssi_offset;
 330
 331         /*
 332          * Calculate the different percentages,
 333          * which will be used for the signal.
 334          */
 335         if (rt2x00dev->rssi_offset)
 336                 rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
 337
 338         /*
 339          * Add the individual percentages and use the WEIGHT
 340          * defines to calculate the current link signal.
 341          */
 342         signal = ((WEIGHT_RSSI * rssi_percentage) +
 343                   (WEIGHT_TX * rt2x00dev->link.qual.tx_percentage) +
 344                   (WEIGHT_RX * rt2x00dev->link.qual.rx_percentage)) / 100;
 345
 346         return (signal > 100) ? 100 : signal;
 347 }
 348
 349 static void rt2x00lib_link_tuner(struct work_struct *work)
 350 {
 351         struct rt2x00_dev *rt2x00dev =
 352             container_of(work, struct rt2x00_dev, link.work.work);
 353
 354         /*
 355          * When the radio is shutting down we should
 356          * immediately cease all link tuning.
 357          */
 358         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 359                 return;
 360
 361         /*
 362          * Update statistics.
 363          */
 364         rt2x00dev->ops->lib->link_stats(rt2x00dev, &rt2x00dev->link.qual);
 365         rt2x00dev->low_level_stats.dot11FCSErrorCount +=
 366             rt2x00dev->link.qual.rx_failed;
 367
 368         /*
 369          * Only perform the link tuning when Link tuning
 370          * has been enabled (This could have been disabled from the EEPROM).
 371          */
 372         if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
 373                 rt2x00dev->ops->lib->link_tuner(rt2x00dev);
 374
 375         /*
 376          * Precalculate a portion of the link signal which is
 377          * in based on the tx/rx success/failure counters.
 378          */
 379         rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
 380
 381         /*
 382          * Evaluate antenna setup, make this the last step since this could
 383          * possibly reset some statistics.
 384          */
 385         rt2x00lib_evaluate_antenna(rt2x00dev);
 386
 387         /*
 388          * Increase tuner counter, and reschedule the next link tuner run.
 389          */
 390         rt2x00dev->link.count++;
 391         queue_delayed_work(rt2x00dev->hw->workqueue, &rt2x00dev->link.work,
 392                            LINK_TUNE_INTERVAL);
 393 }
 394
 395 static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
 396 {
 397         struct rt2x00_dev *rt2x00dev =
 398             container_of(work, struct rt2x00_dev, filter_work);
 399         unsigned int filter = rt2x00dev->packet_filter;
 400
 401         /*
 402          * Since we had stored the filter inside rt2x00dev->packet_filter,
 403          * we should now clear that field. Otherwise the driver will
 404          * assume nothing has changed (*total_flags will be compared
 405          * to rt2x00dev->packet_filter to determine if any action is required).
 406          */
 407         rt2x00dev->packet_filter = 0;
 408
 409         rt2x00dev->ops->hw->configure_filter(rt2x00dev->hw,
 410                                              filter, &filter, 0, NULL);
 411 }
 412
 413 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 414                                           struct ieee80211_vif *vif)
 415 {
 416         struct rt2x00_dev *rt2x00dev = data;
 417         struct rt2x00_intf *intf = vif_to_intf(vif);
 418         struct sk_buff *skb;
 419         struct ieee80211_tx_control control;
 420         struct ieee80211_bss_conf conf;
 421         int delayed_flags;
 422
 423         /*
 424          * Copy all data we need during this action under the protection
 425          * of a spinlock. Otherwise race conditions might occur which results
 426          * into an invalid configuration.
 427          */
 428         spin_lock(&intf->lock);
 429
 430         memcpy(&conf, &intf->conf, sizeof(conf));
 431         delayed_flags = intf->delayed_flags;
 432         intf->delayed_flags = 0;
 433
 434         spin_unlock(&intf->lock);
 435
 436         if (delayed_flags & DELAYED_UPDATE_BEACON) {
 437                 skb = ieee80211_beacon_get(rt2x00dev->hw, vif, &control);
 438                 if (skb) {
 439                         rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, skb,
 440                                                           &control);
 441                         dev_kfree_skb(skb);
 442                 }
 443         }
 444
 445         if (delayed_flags & DELAYED_CONFIG_PREAMBLE)
 446                 rt2x00lib_config_preamble(rt2x00dev, intf,
 447                                           intf->conf.use_short_preamble);
 448 }
 449
 450 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 451 {
 452         struct rt2x00_dev *rt2x00dev =
 453             container_of(work, struct rt2x00_dev, intf_work);
 454
 455         /*
 456          * Iterate over each interface and perform the
 457          * requested configurations.
 458          */
 459         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 460                                             rt2x00lib_intf_scheduled_iter,
 461                                             rt2x00dev);
 462 }
 463
 464 /*
 465  * Interrupt context handlers.
 466  */
 467 static void rt2x00lib_beacondone_iter(void *data, u8 *mac,
 468                                       struct ieee80211_vif *vif)
 469 {
 470         struct rt2x00_intf *intf = vif_to_intf(vif);
 471
 472         if (vif->type != IEEE80211_IF_TYPE_AP &&
 473             vif->type != IEEE80211_IF_TYPE_IBSS)
 474                 return;
 475
 476         spin_lock(&intf->lock);
 477         intf->delayed_flags |= DELAYED_UPDATE_BEACON;
 478         spin_unlock(&intf->lock);
 479 }
 480
 481 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 482 {
 483         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 484                 return;
 485
 486         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 487                                             rt2x00lib_beacondone_iter,
 488                                             rt2x00dev);
 489
 490         queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->intf_work);
 491 }
 492 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 493
 494 void rt2x00lib_txdone(struct queue_entry *entry,
 495                       struct txdone_entry_desc *txdesc)
 496 {
 497         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 498         struct ieee80211_tx_status tx_status;
 499         int success = !!(txdesc->status == TX_SUCCESS ||
 500                          txdesc->status == TX_SUCCESS_RETRY);
 501         int fail = !!(txdesc->status == TX_FAIL_RETRY ||
 502                       txdesc->status == TX_FAIL_INVALID ||
 503                       txdesc->status == TX_FAIL_OTHER);
 504
 505         /*
 506          * Update TX statistics.
 507          */
 508         rt2x00dev->link.qual.tx_success += success;
 509         rt2x00dev->link.qual.tx_failed += txdesc->retry + fail;
 510
 511         /*
 512          * Initialize TX status
 513          */
 514         tx_status.flags = 0;
 515         tx_status.ack_signal = 0;
 516         tx_status.excessive_retries = (txdesc->status == TX_FAIL_RETRY);
 517         tx_status.retry_count = txdesc->retry;
 518         memcpy(&tx_status.control, txdesc->control, sizeof(txdesc->control));
 519
 520         if (!(tx_status.control.flags & IEEE80211_TXCTL_NO_ACK)) {
 521                 if (success)
 522                         tx_status.flags |= IEEE80211_TX_STATUS_ACK;
 523                 else
 524                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 525         }
 526
 527         tx_status.queue_length = entry->queue->limit;
 528         tx_status.queue_number = tx_status.control.queue;
 529
 530         if (tx_status.control.flags & IEEE80211_TXCTL_USE_RTS_CTS) {
 531                 if (success)
 532                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 533                 else
 534                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 535         }
 536
 537         /*
 538          * Send the tx_status to mac80211 & debugfs.
 539          * mac80211 will clean up the skb structure.
 540          */
 541         get_skb_frame_desc(entry->skb)->frame_type = DUMP_FRAME_TXDONE;
 542         rt2x00debug_dump_frame(rt2x00dev, entry->skb);
 543         ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb, &tx_status);
 544         entry->skb = NULL;
 545 }
 546 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 547
 548 void rt2x00lib_rxdone(struct queue_entry *entry,
 549                       struct rxdone_entry_desc *rxdesc)
 550 {
 551         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 552         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 553         struct ieee80211_supported_band *sband;
 554         struct ieee80211_rate *rate;
 555         struct ieee80211_hdr *hdr;
 556         unsigned int i;
 557         int val = 0, idx = -1;
 558         u16 fc;
 559
 560         /*
 561          * Update RX statistics.
 562          */
 563         sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 564         for (i = 0; i < sband->n_bitrates; i++) {
 565                 rate = &sband->bitrates[i];
 566
 567                 /*
 568                  * When frame was received with an OFDM bitrate,
 569                  * the signal is the PLCP value. If it was received with
 570                  * a CCK bitrate the signal is the rate in 0.5kbit/s.
 571                  */
 572                 if (!rxdesc->ofdm)
 573                         val = DEVICE_GET_RATE_FIELD(rate->hw_value, RATE);
 574                 else
 575                         val = DEVICE_GET_RATE_FIELD(rate->hw_value, PLCP);
 576
 577                 if (val == rxdesc->signal) {
 578                         idx = i;
 579                         break;
 580                 }
 581         }
 582
 583         /*
 584          * Only update link status if this is a beacon frame carrying our bssid.
 585          */
 586         hdr = (struct ieee80211_hdr*)entry->skb->data;
 587         fc = le16_to_cpu(hdr->frame_control);
 588         if (is_beacon(fc) && rxdesc->my_bss)
 589                 rt2x00lib_update_link_stats(&rt2x00dev->link, rxdesc->rssi);
 590
 591         rt2x00dev->link.qual.rx_success++;
 592
 593         rx_status->rate_idx = idx;
 594         rx_status->signal =
 595             rt2x00lib_calculate_link_signal(rt2x00dev, rxdesc->rssi);
 596         rx_status->ssi = rxdesc->rssi;
 597         rx_status->flag = rxdesc->flags;
 598         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 599
 600         /*
 601          * Send frame to mac80211 & debugfs.
 602          * mac80211 will clean up the skb structure.
 603          */
 604         get_skb_frame_desc(entry->skb)->frame_type = DUMP_FRAME_RXDONE;
 605         rt2x00debug_dump_frame(rt2x00dev, entry->skb);
 606         ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb, rx_status);
 607         entry->skb = NULL;
 608 }
 609 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 610
 611 /*
 612  * TX descriptor initializer
 613  */
 614 void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 615                              struct sk_buff *skb,
 616                              struct ieee80211_tx_control *control)
 617 {
 618         struct txentry_desc txdesc;
 619         struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
 620         struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
 621         int tx_rate;
 622         int bitrate;
 623         int length;
 624         int duration;
 625         int residual;
 626         u16 frame_control;
 627         u16 seq_ctrl;
 628
 629         memset(&txdesc, 0, sizeof(txdesc));
 630
 631         txdesc.queue = skbdesc->entry->queue->qid;
 632         txdesc.cw_min = skbdesc->entry->queue->cw_min;
 633         txdesc.cw_max = skbdesc->entry->queue->cw_max;
 634         txdesc.aifs = skbdesc->entry->queue->aifs;
 635
 636         /*
 637          * Read required fields from ieee80211 header.
 638          */
 639         frame_control = le16_to_cpu(ieee80211hdr->frame_control);
 640         seq_ctrl = le16_to_cpu(ieee80211hdr->seq_ctrl);
 641
 642         tx_rate = control->tx_rate->hw_value;
 643
 644         /*
 645          * Check whether this frame is to be acked
 646          */
 647         if (!(control->flags & IEEE80211_TXCTL_NO_ACK))
 648                 __set_bit(ENTRY_TXD_ACK, &txdesc.flags);
 649
 650         /*
 651          * Check if this is a RTS/CTS frame
 652          */
 653         if (is_rts_frame(frame_control) || is_cts_frame(frame_control)) {
 654                 __set_bit(ENTRY_TXD_BURST, &txdesc.flags);
 655                 if (is_rts_frame(frame_control)) {
 656                         __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc.flags);
 657                         __set_bit(ENTRY_TXD_ACK, &txdesc.flags);
 658                 } else
 659                         __clear_bit(ENTRY_TXD_ACK, &txdesc.flags);
 660                 if (control->rts_cts_rate)
 661                         tx_rate = control->rts_cts_rate->hw_value;
 662         }
 663
 664         /*
 665          * Check for OFDM
 666          */
 667         if (DEVICE_GET_RATE_FIELD(tx_rate, RATEMASK) & DEV_OFDM_RATEMASK)
 668                 __set_bit(ENTRY_TXD_OFDM_RATE, &txdesc.flags);
 669
 670         /*
 671          * Check if more fragments are pending
 672          */
 673         if (ieee80211_get_morefrag(ieee80211hdr)) {
 674                 __set_bit(ENTRY_TXD_BURST, &txdesc.flags);
 675                 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc.flags);
 676         }
 677
 678         /*
 679          * Beacons and probe responses require the tsf timestamp
 680          * to be inserted into the frame.
 681          */
 682         if (control->queue == RT2X00_BCN_QUEUE_BEACON ||
 683             is_probe_resp(frame_control))
 684                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc.flags);
 685
 686         /*
 687          * Determine with what IFS priority this frame should be send.
 688          * Set ifs to IFS_SIFS when the this is not the first fragment,
 689          * or this fragment came after RTS/CTS.
 690          */
 691         if ((seq_ctrl & IEEE80211_SCTL_FRAG) > 0 ||
 692             test_bit(ENTRY_TXD_RTS_FRAME, &txdesc.flags))
 693                 txdesc.ifs = IFS_SIFS;
 694         else
 695                 txdesc.ifs = IFS_BACKOFF;
 696
 697         /*
 698          * PLCP setup
 699          * Length calculation depends on OFDM/CCK rate.
 700          */
 701         txdesc.signal = DEVICE_GET_RATE_FIELD(tx_rate, PLCP);
 702         txdesc.service = 0x04;
 703
 704         length = skb->len + FCS_LEN;
 705         if (test_bit(ENTRY_TXD_OFDM_RATE, &txdesc.flags)) {
 706                 txdesc.length_high = (length >> 6) & 0x3f;
 707                 txdesc.length_low = length & 0x3f;
 708         } else {
 709                 bitrate = DEVICE_GET_RATE_FIELD(tx_rate, RATE);
 710
 711                 /*
 712                  * Convert length to microseconds.
 713                  */
 714                 residual = get_duration_res(length, bitrate);
 715                 duration = get_duration(length, bitrate);
 716
 717                 if (residual != 0) {
 718                         duration++;
 719
 720                         /*
 721                          * Check if we need to set the Length Extension
 722                          */
 723                         if (bitrate == 110 && residual <= 30)
 724                                 txdesc.service |= 0x80;
 725                 }
 726
 727                 txdesc.length_high = (duration >> 8) & 0xff;
 728                 txdesc.length_low = duration & 0xff;
 729
 730                 /*
 731                  * When preamble is enabled we should set the
 732                  * preamble bit for the signal.
 733                  */
 734                 if (DEVICE_GET_RATE_FIELD(tx_rate, PREAMBLE))
 735                         txdesc.signal |= 0x08;
 736         }
 737
 738         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, skb, &txdesc, control);
 739
 740         /*
 741          * Update queue entry.
 742          */
 743         skbdesc->entry->skb = skb;
 744
 745         /*
 746          * The frame has been completely initialized and ready
 747          * for sending to the device. The caller will push the
 748          * frame to the device, but we are going to push the
 749          * frame to debugfs here.
 750          */
 751         skbdesc->frame_type = DUMP_FRAME_TX;
 752         rt2x00debug_dump_frame(rt2x00dev, skb);
 753 }
 754 EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc);
 755
 756 /*
 757  * Driver initialization handlers.
 758  */
 759 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 760                               const int channel, const int tx_power,
 761                               const int value)
 762 {
 763         if (channel <= 14)
 764                 entry->center_freq = 2407 + (5 * channel);
 765         else
 766                 entry->center_freq = 5000 + (5 * channel);
 767         entry->hw_value = value;
 768         entry->max_power = tx_power;
 769         entry->max_antenna_gain = 0xff;
 770 }
 771
 772 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 773                            const int rate, const int mask,
 774                            const int plcp, const int flags)
 775 {
 776         entry->bitrate = rate;
 777         entry->hw_value =
 778             DEVICE_SET_RATE_FIELD(rate, RATE) |
 779             DEVICE_SET_RATE_FIELD(mask, RATEMASK) |
 780             DEVICE_SET_RATE_FIELD(plcp, PLCP);
 781         entry->flags = flags;
 782         entry->hw_value_short = entry->hw_value;
 783         if (entry->flags & IEEE80211_RATE_SHORT_PREAMBLE)
 784                 entry->hw_value_short |= DEVICE_SET_RATE_FIELD(1, PREAMBLE);
 785 }
 786
 787 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 788                                     struct hw_mode_spec *spec)
 789 {
 790         struct ieee80211_hw *hw = rt2x00dev->hw;
 791         struct ieee80211_supported_band *sbands;
 792         struct ieee80211_channel *channels;
 793         struct ieee80211_rate *rates;
 794         unsigned int i;
 795         unsigned char tx_power;
 796
 797         sbands = &rt2x00dev->bands[0];
 798
 799         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 800         if (!channels)
 801                 return -ENOMEM;
 802
 803         rates = kzalloc(sizeof(*rates) * spec->num_rates, GFP_KERNEL);
 804         if (!rates)
 805                 goto exit_free_channels;
 806
 807         /*
 808          * Initialize Rate list.
 809          */
 810         rt2x00lib_rate(&rates[0], 10, DEV_RATEMASK_1MB,
 811                        0x00, 0);
 812         rt2x00lib_rate(&rates[1], 20, DEV_RATEMASK_2MB,
 813                        0x01, IEEE80211_RATE_SHORT_PREAMBLE);
 814         rt2x00lib_rate(&rates[2], 55, DEV_RATEMASK_5_5MB,
 815                        0x02, IEEE80211_RATE_SHORT_PREAMBLE);
 816         rt2x00lib_rate(&rates[3], 110, DEV_RATEMASK_11MB,
 817                        0x03, IEEE80211_RATE_SHORT_PREAMBLE);
 818
 819         if (spec->num_rates > 4) {
 820                 rt2x00lib_rate(&rates[4], 60, DEV_RATEMASK_6MB,
 821                                0x0b, 0);
 822                 rt2x00lib_rate(&rates[5], 90, DEV_RATEMASK_9MB,
 823                                0x0f, 0);
 824                 rt2x00lib_rate(&rates[6], 120, DEV_RATEMASK_12MB,
 825                                0x0a, 0);
 826                 rt2x00lib_rate(&rates[7], 180, DEV_RATEMASK_18MB,
 827                                0x0e, 0);
 828                 rt2x00lib_rate(&rates[8], 240, DEV_RATEMASK_24MB,
 829                                0x09, 0);
 830                 rt2x00lib_rate(&rates[9], 360, DEV_RATEMASK_36MB,
 831                                0x0d, 0);
 832                 rt2x00lib_rate(&rates[10], 480, DEV_RATEMASK_48MB,
 833                                0x08, 0);
 834                 rt2x00lib_rate(&rates[11], 540, DEV_RATEMASK_54MB,
 835                                0x0c, 0);
 836         }
 837
 838         /*
 839          * Initialize Channel list.
 840          */
 841         for (i = 0; i < spec->num_channels; i++) {
 842                 if (spec->channels[i].channel <= 14)
 843                         tx_power = spec->tx_power_bg[i];
 844                 else if (spec->tx_power_a)
 845                         tx_power = spec->tx_power_a[i];
 846                 else
 847                         tx_power = spec->tx_power_default;
 848
 849                 rt2x00lib_channel(&channels[i],
 850                                   spec->channels[i].channel, tx_power, i);
 851         }
 852
 853         /*
 854          * Intitialize 802.11b
 855          * Rates: CCK.
 856          * Channels: 2.4 GHz
 857          */
 858         if (spec->num_modes > HWMODE_B) {
 859                 sbands[IEEE80211_BAND_2GHZ].n_channels = 14;
 860                 sbands[IEEE80211_BAND_2GHZ].n_bitrates = 4;
 861                 sbands[IEEE80211_BAND_2GHZ].channels = channels;
 862                 sbands[IEEE80211_BAND_2GHZ].bitrates = rates;
 863                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 864         }
 865
 866         /*
 867          * Intitialize 802.11g
 868          * Rates: CCK, OFDM.
 869          * Channels: 2.4 GHz
 870          */
 871         if (spec->num_modes > HWMODE_G) {
 872                 sbands[IEEE80211_BAND_2GHZ].n_channels = 14;
 873                 sbands[IEEE80211_BAND_2GHZ].n_bitrates = spec->num_rates;
 874                 sbands[IEEE80211_BAND_2GHZ].channels = channels;
 875                 sbands[IEEE80211_BAND_2GHZ].bitrates = rates;
 876                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 877         }
 878
 879         /*
 880          * Intitialize 802.11a
 881          * Rates: OFDM.
 882          * Channels: OFDM, UNII, HiperLAN2.
 883          */
 884         if (spec->num_modes > HWMODE_A) {
 885                 sbands[IEEE80211_BAND_5GHZ].n_channels = spec->num_channels - 14;
 886                 sbands[IEEE80211_BAND_5GHZ].n_bitrates = spec->num_rates - 4;
 887                 sbands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 888                 sbands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 889                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] = &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 890         }
 891
 892         return 0;
 893
 894  exit_free_channels:
 895         kfree(channels);
 896         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 897         return -ENOMEM;
 898 }
 899
 900 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 901 {
 902         if (test_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags))
 903                 ieee80211_unregister_hw(rt2x00dev->hw);
 904
 905         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 906                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 907                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 908                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 909                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 910         }
 911 }
 912
 913 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 914 {
 915         struct hw_mode_spec *spec = &rt2x00dev->spec;
 916         int status;
 917
 918         /*
 919          * Initialize HW modes.
 920          */
 921         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 922         if (status)
 923                 return status;
 924
 925         /*
 926          * Register HW.
 927          */
 928         status = ieee80211_register_hw(rt2x00dev->hw);
 929         if (status) {
 930                 rt2x00lib_remove_hw(rt2x00dev);
 931                 return status;
 932         }
 933
 934         __set_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags);
 935
 936         return 0;
 937 }
 938
 939 /*
 940  * Initialization/uninitialization handlers.
 941  */
 942 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 943 {
 944         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 945                 return;
 946
 947         /*
 948          * Unregister rfkill.
 949          */
 950         rt2x00rfkill_unregister(rt2x00dev);
 951
 952         /*
 953          * Allow the HW to uninitialize.
 954          */
 955         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 956
 957         /*
 958          * Free allocated queue entries.
 959          */
 960         rt2x00queue_uninitialize(rt2x00dev);
 961 }
 962
 963 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 964 {
 965         int status;
 966
 967         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 968                 return 0;
 969
 970         /*
 971          * Allocate all queue entries.
 972          */
 973         status = rt2x00queue_initialize(rt2x00dev);
 974         if (status)
 975                 return status;
 976
 977         /*
 978          * Initialize the device.
 979          */
 980         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 981         if (status)
 982                 goto exit;
 983
 984         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
 985
 986         /*
 987          * Register the rfkill handler.
 988          */
 989         status = rt2x00rfkill_register(rt2x00dev);
 990         if (status)
 991                 goto exit;
 992
 993         return 0;
 994
 995 exit:
 996         rt2x00lib_uninitialize(rt2x00dev);
 997
 998         return status;
 999 }
1000
1001 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1002 {
1003         int retval;
1004
1005         if (test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1006                 return 0;
1007
1008         /*
1009          * If this is the first interface which is added,
1010          * we should load the firmware now.
1011          */
1012         retval = rt2x00lib_load_firmware(rt2x00dev);
1013         if (retval)
1014                 return retval;
1015
1016         /*
1017          * Initialize the device.
1018          */
1019         retval = rt2x00lib_initialize(rt2x00dev);
1020         if (retval)
1021                 return retval;
1022
1023         /*
1024          * Enable radio.
1025          */
1026         retval = rt2x00lib_enable_radio(rt2x00dev);
1027         if (retval) {
1028                 rt2x00lib_uninitialize(rt2x00dev);
1029                 return retval;
1030         }
1031
1032         rt2x00dev->intf_ap_count = 0;
1033         rt2x00dev->intf_sta_count = 0;
1034         rt2x00dev->intf_associated = 0;
1035
1036         __set_bit(DEVICE_STARTED, &rt2x00dev->flags);
1037
1038         return 0;
1039 }
1040
1041 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1042 {
1043         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1044                 return;
1045
1046         /*
1047          * Perhaps we can add something smarter here,
1048          * but for now just disabling the radio should do.
1049          */
1050         rt2x00lib_disable_radio(rt2x00dev);
1051
1052         rt2x00dev->intf_ap_count = 0;
1053         rt2x00dev->intf_sta_count = 0;
1054         rt2x00dev->intf_associated = 0;
1055
1056         __clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
1057 }
1058
1059 /*
1060  * driver allocation handlers.
1061  */
1062 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1063 {
1064         int retval = -ENOMEM;
1065
1066         /*
1067          * Make room for rt2x00_intf inside the per-interface
1068          * structure ieee80211_vif.
1069          */
1070         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1071
1072         /*
1073          * Let the driver probe the device to detect the capabilities.
1074          */
1075         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1076         if (retval) {
1077                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1078                 goto exit;
1079         }
1080
1081         /*
1082          * Initialize configuration work.
1083          */
1084         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1085         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
1086         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
1087
1088         /*
1089          * Allocate queue array.
1090          */
1091         retval = rt2x00queue_allocate(rt2x00dev);
1092         if (retval)
1093                 goto exit;
1094
1095         /*
1096          * Initialize ieee80211 structure.
1097          */
1098         retval = rt2x00lib_probe_hw(rt2x00dev);
1099         if (retval) {
1100                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1101                 goto exit;
1102         }
1103
1104         /*
1105          * Allocatie rfkill.
1106          */
1107         retval = rt2x00rfkill_allocate(rt2x00dev);
1108         if (retval)
1109                 goto exit;
1110
1111         /*
1112          * Open the debugfs entry.
1113          */
1114         rt2x00debug_register(rt2x00dev);
1115
1116         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1117
1118         return 0;
1119
1120 exit:
1121         rt2x00lib_remove_dev(rt2x00dev);
1122
1123         return retval;
1124 }
1125 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1126
1127 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1128 {
1129         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1130
1131         /*
1132          * Disable radio.
1133          */
1134         rt2x00lib_disable_radio(rt2x00dev);
1135
1136         /*
1137          * Uninitialize device.
1138          */
1139         rt2x00lib_uninitialize(rt2x00dev);
1140
1141         /*
1142          * Close debugfs entry.
1143          */
1144         rt2x00debug_deregister(rt2x00dev);
1145
1146         /*
1147          * Free rfkill
1148          */
1149         rt2x00rfkill_free(rt2x00dev);
1150
1151         /*
1152          * Free ieee80211_hw memory.
1153          */
1154         rt2x00lib_remove_hw(rt2x00dev);
1155
1156         /*
1157          * Free firmware image.
1158          */
1159         rt2x00lib_free_firmware(rt2x00dev);
1160
1161         /*
1162          * Free queue structures.
1163          */
1164         rt2x00queue_free(rt2x00dev);
1165 }
1166 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1167
1168 /*
1169  * Device state handlers
1170  */
1171 #ifdef CONFIG_PM
1172 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1173 {
1174         int retval;
1175
1176         NOTICE(rt2x00dev, "Going to sleep.\n");
1177         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1178
1179         /*
1180          * Only continue if mac80211 has open interfaces.
1181          */
1182         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1183                 goto exit;
1184         __set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
1185
1186         /*
1187          * Disable radio and unitialize all items
1188          * that must be recreated on resume.
1189          */
1190         rt2x00lib_stop(rt2x00dev);
1191         rt2x00lib_uninitialize(rt2x00dev);
1192         rt2x00debug_deregister(rt2x00dev);
1193
1194 exit:
1195         /*
1196          * Set device mode to sleep for power management.
1197          */
1198         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1199         if (retval)
1200                 return retval;
1201
1202         return 0;
1203 }
1204 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1205
1206 static void rt2x00lib_resume_intf(void *data, u8 *mac,
1207                                   struct ieee80211_vif *vif)
1208 {
1209         struct rt2x00_dev *rt2x00dev = data;
1210         struct rt2x00_intf *intf = vif_to_intf(vif);
1211
1212         spin_lock(&intf->lock);
1213
1214         rt2x00lib_config_intf(rt2x00dev, intf,
1215                               vif->type, intf->mac, intf->bssid);
1216
1217
1218         /*
1219          * Master or Ad-hoc mode require a new beacon update.
1220          */
1221         if (vif->type == IEEE80211_IF_TYPE_AP ||
1222             vif->type == IEEE80211_IF_TYPE_IBSS)
1223                 intf->delayed_flags |= DELAYED_UPDATE_BEACON;
1224
1225         spin_unlock(&intf->lock);
1226 }
1227
1228 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1229 {
1230         int retval;
1231
1232         NOTICE(rt2x00dev, "Waking up.\n");
1233
1234         /*
1235          * Open the debugfs entry.
1236          */
1237         rt2x00debug_register(rt2x00dev);
1238
1239         /*
1240          * Only continue if mac80211 had open interfaces.
1241          */
1242         if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
1243                 return 0;
1244
1245         /*
1246          * Reinitialize device and all active interfaces.
1247          */
1248         retval = rt2x00lib_start(rt2x00dev);
1249         if (retval)
1250                 goto exit;
1251
1252         /*
1253          * Reconfigure device.
1254          */
1255         rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
1256         if (!rt2x00dev->hw->conf.radio_enabled)
1257                 rt2x00lib_disable_radio(rt2x00dev);
1258
1259         /*
1260          * Iterator over each active interface to
1261          * reconfigure the hardware.
1262          */
1263         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
1264                                             rt2x00lib_resume_intf, rt2x00dev);
1265
1266         /*
1267          * We are ready again to receive requests from mac80211.
1268          */
1269         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1270
1271         /*
1272          * It is possible that during that mac80211 has attempted
1273          * to send frames while we were suspending or resuming.
1274          * In that case we have disabled the TX queue and should
1275          * now enable it again
1276          */
1277         ieee80211_start_queues(rt2x00dev->hw);
1278
1279         /*
1280          * During interface iteration we might have changed the
1281          * delayed_flags, time to handles the event by calling
1282          * the work handler directly.
1283          */
1284         rt2x00lib_intf_scheduled(&rt2x00dev->intf_work);
1285
1286         return 0;
1287
1288 exit:
1289         rt2x00lib_disable_radio(rt2x00dev);
1290         rt2x00lib_uninitialize(rt2x00dev);
1291         rt2x00debug_deregister(rt2x00dev);
1292
1293         return retval;
1294 }
1295 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1296 #endif /* CONFIG_PM */
1297
1298 /*
1299  * rt2x00lib module information.
1300  */
1301 MODULE_AUTHOR(DRV_PROJECT);
1302 MODULE_VERSION(DRV_VERSION);
1303 MODULE_DESCRIPTION("rt2x00 library");
1304 MODULE_LICENSE("GPL");