err.no Git - linux-2.6/blob - 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_hdr *hdr;
 555         const struct rt2x00_rate *rate;
 556         unsigned int i;
 557         int 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 = rt2x00_get_rate(sband->bitrates[i].hw_value);
 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 100kbit/s.
 571                  */
 572                 if ((rxdesc->ofdm && rate->plcp == rxdesc->signal) ||
 573                     (!rxdesc->ofdm && rate->bitrate == rxdesc->signal)) {
 574                         idx = i;
 575                         break;
 576                 }
 577         }
 578
 579         /*
 580          * Only update link status if this is a beacon frame carrying our bssid.
 581          */
 582         hdr = (struct ieee80211_hdr *)entry->skb->data;
 583         fc = le16_to_cpu(hdr->frame_control);
 584         if (is_beacon(fc) && rxdesc->my_bss)
 585                 rt2x00lib_update_link_stats(&rt2x00dev->link, rxdesc->rssi);
 586
 587         rt2x00dev->link.qual.rx_success++;
 588
 589         rx_status->rate_idx = idx;
 590         rx_status->signal =
 591             rt2x00lib_calculate_link_signal(rt2x00dev, rxdesc->rssi);
 592         rx_status->ssi = rxdesc->rssi;
 593         rx_status->flag = rxdesc->flags;
 594         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 595
 596         /*
 597          * Send frame to mac80211 & debugfs.
 598          * mac80211 will clean up the skb structure.
 599          */
 600         get_skb_frame_desc(entry->skb)->frame_type = DUMP_FRAME_RXDONE;
 601         rt2x00debug_dump_frame(rt2x00dev, entry->skb);
 602         ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb, rx_status);
 603         entry->skb = NULL;
 604 }
 605 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 606
 607 /*
 608  * TX descriptor initializer
 609  */
 610 void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 611                              struct sk_buff *skb,
 612                              struct ieee80211_tx_control *control)
 613 {
 614         struct txentry_desc txdesc;
 615         struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
 616         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 617         const struct rt2x00_rate *rate;
 618         int tx_rate;
 619         int length;
 620         int duration;
 621         int residual;
 622         u16 frame_control;
 623         u16 seq_ctrl;
 624
 625         memset(&txdesc, 0, sizeof(txdesc));
 626
 627         txdesc.queue = skbdesc->entry->queue->qid;
 628         txdesc.cw_min = skbdesc->entry->queue->cw_min;
 629         txdesc.cw_max = skbdesc->entry->queue->cw_max;
 630         txdesc.aifs = skbdesc->entry->queue->aifs;
 631
 632         /*
 633          * Read required fields from ieee80211 header.
 634          */
 635         frame_control = le16_to_cpu(hdr->frame_control);
 636         seq_ctrl = le16_to_cpu(hdr->seq_ctrl);
 637
 638         tx_rate = control->tx_rate->hw_value;
 639
 640         /*
 641          * Check whether this frame is to be acked
 642          */
 643         if (!(control->flags & IEEE80211_TXCTL_NO_ACK))
 644                 __set_bit(ENTRY_TXD_ACK, &txdesc.flags);
 645
 646         /*
 647          * Check if this is a RTS/CTS frame
 648          */
 649         if (is_rts_frame(frame_control) || is_cts_frame(frame_control)) {
 650                 __set_bit(ENTRY_TXD_BURST, &txdesc.flags);
 651                 if (is_rts_frame(frame_control)) {
 652                         __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc.flags);
 653                         __set_bit(ENTRY_TXD_ACK, &txdesc.flags);
 654                 } else
 655                         __clear_bit(ENTRY_TXD_ACK, &txdesc.flags);
 656                 if (control->rts_cts_rate)
 657                         tx_rate = control->rts_cts_rate->hw_value;
 658         }
 659
 660         rate = rt2x00_get_rate(tx_rate);
 661
 662         /*
 663          * Check if more fragments are pending
 664          */
 665         if (ieee80211_get_morefrag(hdr)) {
 666                 __set_bit(ENTRY_TXD_BURST, &txdesc.flags);
 667                 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc.flags);
 668         }
 669
 670         /*
 671          * Beacons and probe responses require the tsf timestamp
 672          * to be inserted into the frame.
 673          */
 674         if (control->queue == RT2X00_BCN_QUEUE_BEACON ||
 675             is_probe_resp(frame_control))
 676                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc.flags);
 677
 678         /*
 679          * Determine with what IFS priority this frame should be send.
 680          * Set ifs to IFS_SIFS when the this is not the first fragment,
 681          * or this fragment came after RTS/CTS.
 682          */
 683         if ((seq_ctrl & IEEE80211_SCTL_FRAG) > 0 ||
 684             test_bit(ENTRY_TXD_RTS_FRAME, &txdesc.flags))
 685                 txdesc.ifs = IFS_SIFS;
 686         else
 687                 txdesc.ifs = IFS_BACKOFF;
 688
 689         /*
 690          * PLCP setup
 691          * Length calculation depends on OFDM/CCK rate.
 692          */
 693         txdesc.signal = rate->plcp;
 694         txdesc.service = 0x04;
 695
 696         length = skb->len + FCS_LEN;
 697         if (rate->flags & DEV_RATE_OFDM) {
 698                 __set_bit(ENTRY_TXD_OFDM_RATE, &txdesc.flags);
 699
 700                 txdesc.length_high = (length >> 6) & 0x3f;
 701                 txdesc.length_low = length & 0x3f;
 702         } else {
 703                 /*
 704                  * Convert length to microseconds.
 705                  */
 706                 residual = get_duration_res(length, rate->bitrate);
 707                 duration = get_duration(length, rate->bitrate);
 708
 709                 if (residual != 0) {
 710                         duration++;
 711
 712                         /*
 713                          * Check if we need to set the Length Extension
 714                          */
 715                         if (rate->bitrate == 110 && residual <= 30)
 716                                 txdesc.service |= 0x80;
 717                 }
 718
 719                 txdesc.length_high = (duration >> 8) & 0xff;
 720                 txdesc.length_low = duration & 0xff;
 721
 722                 /*
 723                  * When preamble is enabled we should set the
 724                  * preamble bit for the signal.
 725                  */
 726                 if (rt2x00_get_rate_preamble(tx_rate))
 727                         txdesc.signal |= 0x08;
 728         }
 729
 730         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, skb, &txdesc, control);
 731
 732         /*
 733          * Update queue entry.
 734          */
 735         skbdesc->entry->skb = skb;
 736
 737         /*
 738          * The frame has been completely initialized and ready
 739          * for sending to the device. The caller will push the
 740          * frame to the device, but we are going to push the
 741          * frame to debugfs here.
 742          */
 743         skbdesc->frame_type = DUMP_FRAME_TX;
 744         rt2x00debug_dump_frame(rt2x00dev, skb);
 745 }
 746 EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc);
 747
 748 /*
 749  * Driver initialization handlers.
 750  */
 751 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 752         {
 753                 .flags = 0,
 754                 .bitrate = 10,
 755                 .ratemask = DEV_RATEMASK_1MB,
 756                 .plcp = 0x00,
 757         },
 758         {
 759                 .flags = DEV_RATE_SHORT_PREAMBLE,
 760                 .bitrate = 20,
 761                 .ratemask = DEV_RATEMASK_2MB,
 762                 .plcp = 0x01,
 763         },
 764         {
 765                 .flags = DEV_RATE_SHORT_PREAMBLE,
 766                 .bitrate = 55,
 767                 .ratemask = DEV_RATEMASK_5_5MB,
 768                 .plcp = 0x02,
 769         },
 770         {
 771                 .flags = DEV_RATE_SHORT_PREAMBLE,
 772                 .bitrate = 110,
 773                 .ratemask = DEV_RATEMASK_11MB,
 774                 .plcp = 0x03,
 775         },
 776         {
 777                 .flags = DEV_RATE_OFDM,
 778                 .bitrate = 60,
 779                 .ratemask = DEV_RATEMASK_6MB,
 780                 .plcp = 0x0b,
 781         },
 782         {
 783                 .flags = DEV_RATE_OFDM,
 784                 .bitrate = 90,
 785                 .ratemask = DEV_RATEMASK_9MB,
 786                 .plcp = 0x0f,
 787         },
 788         {
 789                 .flags = DEV_RATE_OFDM,
 790                 .bitrate = 120,
 791                 .ratemask = DEV_RATEMASK_12MB,
 792                 .plcp = 0x0a,
 793         },
 794         {
 795                 .flags = DEV_RATE_OFDM,
 796                 .bitrate = 180,
 797                 .ratemask = DEV_RATEMASK_18MB,
 798                 .plcp = 0x0e,
 799         },
 800         {
 801                 .flags = DEV_RATE_OFDM,
 802                 .bitrate = 240,
 803                 .ratemask = DEV_RATEMASK_24MB,
 804                 .plcp = 0x09,
 805         },
 806         {
 807                 .flags = DEV_RATE_OFDM,
 808                 .bitrate = 360,
 809                 .ratemask = DEV_RATEMASK_36MB,
 810                 .plcp = 0x0d,
 811         },
 812         {
 813                 .flags = DEV_RATE_OFDM,
 814                 .bitrate = 480,
 815                 .ratemask = DEV_RATEMASK_48MB,
 816                 .plcp = 0x08,
 817         },
 818         {
 819                 .flags = DEV_RATE_OFDM,
 820                 .bitrate = 540,
 821                 .ratemask = DEV_RATEMASK_54MB,
 822                 .plcp = 0x0c,
 823         },
 824 };
 825
 826 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 827                               const int channel, const int tx_power,
 828                               const int value)
 829 {
 830         entry->center_freq = ieee80211_channel_to_frequency(channel);
 831         entry->hw_value = value;
 832         entry->max_power = tx_power;
 833         entry->max_antenna_gain = 0xff;
 834 }
 835
 836 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 837                            const u16 index, const struct rt2x00_rate *rate)
 838 {
 839         entry->flags = 0;
 840         entry->bitrate = rate->bitrate;
 841         entry->hw_value = rt2x00_create_rate_hw_value(index, 0);
 842         entry->hw_value_short = entry->hw_value;
 843
 844         if (rate->flags & DEV_RATE_SHORT_PREAMBLE) {
 845                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 846                 entry->hw_value_short |= rt2x00_create_rate_hw_value(index, 1);
 847         }
 848 }
 849
 850 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 851                                     struct hw_mode_spec *spec)
 852 {
 853         struct ieee80211_hw *hw = rt2x00dev->hw;
 854         struct ieee80211_supported_band *sbands;
 855         struct ieee80211_channel *channels;
 856         struct ieee80211_rate *rates;
 857         unsigned int i;
 858         unsigned char tx_power;
 859
 860         sbands = &rt2x00dev->bands[0];
 861
 862         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 863         if (!channels)
 864                 return -ENOMEM;
 865
 866         rates = kzalloc(sizeof(*rates) * spec->num_rates, GFP_KERNEL);
 867         if (!rates)
 868                 goto exit_free_channels;
 869
 870         /*
 871          * Initialize Rate list.
 872          */
 873         for (i = 0; i < spec->num_rates; i++)
 874                 rt2x00lib_rate(&rates[0], i, rt2x00_get_rate(i));
 875
 876         /*
 877          * Initialize Channel list.
 878          */
 879         for (i = 0; i < spec->num_channels; i++) {
 880                 if (spec->channels[i].channel <= 14)
 881                         tx_power = spec->tx_power_bg[i];
 882                 else if (spec->tx_power_a)
 883                         tx_power = spec->tx_power_a[i];
 884                 else
 885                         tx_power = spec->tx_power_default;
 886
 887                 rt2x00lib_channel(&channels[i],
 888                                   spec->channels[i].channel, tx_power, i);
 889         }
 890
 891         /*
 892          * Intitialize 802.11b
 893          * Rates: CCK.
 894          * Channels: 2.4 GHz
 895          */
 896         if (spec->num_modes > 0) {
 897                 sbands[IEEE80211_BAND_2GHZ].n_channels = 14;
 898                 sbands[IEEE80211_BAND_2GHZ].n_bitrates = 4;
 899                 sbands[IEEE80211_BAND_2GHZ].channels = channels;
 900                 sbands[IEEE80211_BAND_2GHZ].bitrates = rates;
 901                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 902         }
 903
 904         /*
 905          * Intitialize 802.11g
 906          * Rates: CCK, OFDM.
 907          * Channels: 2.4 GHz
 908          */
 909         if (spec->num_modes > 1) {
 910                 sbands[IEEE80211_BAND_2GHZ].n_channels = 14;
 911                 sbands[IEEE80211_BAND_2GHZ].n_bitrates = spec->num_rates;
 912                 sbands[IEEE80211_BAND_2GHZ].channels = channels;
 913                 sbands[IEEE80211_BAND_2GHZ].bitrates = rates;
 914                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 915         }
 916
 917         /*
 918          * Intitialize 802.11a
 919          * Rates: OFDM.
 920          * Channels: OFDM, UNII, HiperLAN2.
 921          */
 922         if (spec->num_modes > 2) {
 923                 sbands[IEEE80211_BAND_5GHZ].n_channels = spec->num_channels - 14;
 924                 sbands[IEEE80211_BAND_5GHZ].n_bitrates = spec->num_rates - 4;
 925                 sbands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 926                 sbands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 927                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] = &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 928         }
 929
 930         return 0;
 931
 932  exit_free_channels:
 933         kfree(channels);
 934         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 935         return -ENOMEM;
 936 }
 937
 938 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 939 {
 940         if (test_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags))
 941                 ieee80211_unregister_hw(rt2x00dev->hw);
 942
 943         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 944                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 945                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 946                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 947                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 948         }
 949 }
 950
 951 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 952 {
 953         struct hw_mode_spec *spec = &rt2x00dev->spec;
 954         int status;
 955
 956         /*
 957          * Initialize HW modes.
 958          */
 959         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 960         if (status)
 961                 return status;
 962
 963         /*
 964          * Register HW.
 965          */
 966         status = ieee80211_register_hw(rt2x00dev->hw);
 967         if (status) {
 968                 rt2x00lib_remove_hw(rt2x00dev);
 969                 return status;
 970         }
 971
 972         __set_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags);
 973
 974         return 0;
 975 }
 976
 977 /*
 978  * Initialization/uninitialization handlers.
 979  */
 980 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 981 {
 982         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 983                 return;
 984
 985         /*
 986          * Unregister rfkill.
 987          */
 988         rt2x00rfkill_unregister(rt2x00dev);
 989
 990         /*
 991          * Allow the HW to uninitialize.
 992          */
 993         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 994
 995         /*
 996          * Free allocated queue entries.
 997          */
 998         rt2x00queue_uninitialize(rt2x00dev);
 999 }
1000
1001 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1002 {
1003         int status;
1004
1005         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1006                 return 0;
1007
1008         /*
1009          * Allocate all queue entries.
1010          */
1011         status = rt2x00queue_initialize(rt2x00dev);
1012         if (status)
1013                 return status;
1014
1015         /*
1016          * Initialize the device.
1017          */
1018         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1019         if (status)
1020                 goto exit;
1021
1022         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
1023
1024         /*
1025          * Register the rfkill handler.
1026          */
1027         status = rt2x00rfkill_register(rt2x00dev);
1028         if (status)
1029                 goto exit;
1030
1031         return 0;
1032
1033 exit:
1034         rt2x00lib_uninitialize(rt2x00dev);
1035
1036         return status;
1037 }
1038
1039 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1040 {
1041         int retval;
1042
1043         if (test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1044                 return 0;
1045
1046         /*
1047          * If this is the first interface which is added,
1048          * we should load the firmware now.
1049          */
1050         retval = rt2x00lib_load_firmware(rt2x00dev);
1051         if (retval)
1052                 return retval;
1053
1054         /*
1055          * Initialize the device.
1056          */
1057         retval = rt2x00lib_initialize(rt2x00dev);
1058         if (retval)
1059                 return retval;
1060
1061         /*
1062          * Enable radio.
1063          */
1064         retval = rt2x00lib_enable_radio(rt2x00dev);
1065         if (retval) {
1066                 rt2x00lib_uninitialize(rt2x00dev);
1067                 return retval;
1068         }
1069
1070         rt2x00dev->intf_ap_count = 0;
1071         rt2x00dev->intf_sta_count = 0;
1072         rt2x00dev->intf_associated = 0;
1073
1074         __set_bit(DEVICE_STARTED, &rt2x00dev->flags);
1075
1076         return 0;
1077 }
1078
1079 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1080 {
1081         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1082                 return;
1083
1084         /*
1085          * Perhaps we can add something smarter here,
1086          * but for now just disabling the radio should do.
1087          */
1088         rt2x00lib_disable_radio(rt2x00dev);
1089
1090         rt2x00dev->intf_ap_count = 0;
1091         rt2x00dev->intf_sta_count = 0;
1092         rt2x00dev->intf_associated = 0;
1093
1094         __clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
1095 }
1096
1097 /*
1098  * driver allocation handlers.
1099  */
1100 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1101 {
1102         int retval = -ENOMEM;
1103
1104         /*
1105          * Make room for rt2x00_intf inside the per-interface
1106          * structure ieee80211_vif.
1107          */
1108         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1109
1110         /*
1111          * Let the driver probe the device to detect the capabilities.
1112          */
1113         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1114         if (retval) {
1115                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1116                 goto exit;
1117         }
1118
1119         /*
1120          * Initialize configuration work.
1121          */
1122         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1123         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
1124         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
1125
1126         /*
1127          * Allocate queue array.
1128          */
1129         retval = rt2x00queue_allocate(rt2x00dev);
1130         if (retval)
1131                 goto exit;
1132
1133         /*
1134          * Initialize ieee80211 structure.
1135          */
1136         retval = rt2x00lib_probe_hw(rt2x00dev);
1137         if (retval) {
1138                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1139                 goto exit;
1140         }
1141
1142         /*
1143          * Allocatie rfkill.
1144          */
1145         retval = rt2x00rfkill_allocate(rt2x00dev);
1146         if (retval)
1147                 goto exit;
1148
1149         /*
1150          * Open the debugfs entry.
1151          */
1152         rt2x00debug_register(rt2x00dev);
1153
1154         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1155
1156         return 0;
1157
1158 exit:
1159         rt2x00lib_remove_dev(rt2x00dev);
1160
1161         return retval;
1162 }
1163 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1164
1165 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1166 {
1167         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1168
1169         /*
1170          * Disable radio.
1171          */
1172         rt2x00lib_disable_radio(rt2x00dev);
1173
1174         /*
1175          * Uninitialize device.
1176          */
1177         rt2x00lib_uninitialize(rt2x00dev);
1178
1179         /*
1180          * Close debugfs entry.
1181          */
1182         rt2x00debug_deregister(rt2x00dev);
1183
1184         /*
1185          * Free rfkill
1186          */
1187         rt2x00rfkill_free(rt2x00dev);
1188
1189         /*
1190          * Free ieee80211_hw memory.
1191          */
1192         rt2x00lib_remove_hw(rt2x00dev);
1193
1194         /*
1195          * Free firmware image.
1196          */
1197         rt2x00lib_free_firmware(rt2x00dev);
1198
1199         /*
1200          * Free queue structures.
1201          */
1202         rt2x00queue_free(rt2x00dev);
1203 }
1204 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1205
1206 /*
1207  * Device state handlers
1208  */
1209 #ifdef CONFIG_PM
1210 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1211 {
1212         int retval;
1213
1214         NOTICE(rt2x00dev, "Going to sleep.\n");
1215         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1216
1217         /*
1218          * Only continue if mac80211 has open interfaces.
1219          */
1220         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1221                 goto exit;
1222         __set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
1223
1224         /*
1225          * Disable radio and unitialize all items
1226          * that must be recreated on resume.
1227          */
1228         rt2x00lib_stop(rt2x00dev);
1229         rt2x00lib_uninitialize(rt2x00dev);
1230         rt2x00debug_deregister(rt2x00dev);
1231
1232 exit:
1233         /*
1234          * Set device mode to sleep for power management.
1235          */
1236         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1237         if (retval)
1238                 return retval;
1239
1240         return 0;
1241 }
1242 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1243
1244 static void rt2x00lib_resume_intf(void *data, u8 *mac,
1245                                   struct ieee80211_vif *vif)
1246 {
1247         struct rt2x00_dev *rt2x00dev = data;
1248         struct rt2x00_intf *intf = vif_to_intf(vif);
1249
1250         spin_lock(&intf->lock);
1251
1252         rt2x00lib_config_intf(rt2x00dev, intf,
1253                               vif->type, intf->mac, intf->bssid);
1254
1255
1256         /*
1257          * Master or Ad-hoc mode require a new beacon update.
1258          */
1259         if (vif->type == IEEE80211_IF_TYPE_AP ||
1260             vif->type == IEEE80211_IF_TYPE_IBSS)
1261                 intf->delayed_flags |= DELAYED_UPDATE_BEACON;
1262
1263         spin_unlock(&intf->lock);
1264 }
1265
1266 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1267 {
1268         int retval;
1269
1270         NOTICE(rt2x00dev, "Waking up.\n");
1271
1272         /*
1273          * Open the debugfs entry.
1274          */
1275         rt2x00debug_register(rt2x00dev);
1276
1277         /*
1278          * Only continue if mac80211 had open interfaces.
1279          */
1280         if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
1281                 return 0;
1282
1283         /*
1284          * Reinitialize device and all active interfaces.
1285          */
1286         retval = rt2x00lib_start(rt2x00dev);
1287         if (retval)
1288                 goto exit;
1289
1290         /*
1291          * Reconfigure device.
1292          */
1293         rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
1294         if (!rt2x00dev->hw->conf.radio_enabled)
1295                 rt2x00lib_disable_radio(rt2x00dev);
1296
1297         /*
1298          * Iterator over each active interface to
1299          * reconfigure the hardware.
1300          */
1301         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
1302                                             rt2x00lib_resume_intf, rt2x00dev);
1303
1304         /*
1305          * We are ready again to receive requests from mac80211.
1306          */
1307         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1308
1309         /*
1310          * It is possible that during that mac80211 has attempted
1311          * to send frames while we were suspending or resuming.
1312          * In that case we have disabled the TX queue and should
1313          * now enable it again
1314          */
1315         ieee80211_start_queues(rt2x00dev->hw);
1316
1317         /*
1318          * During interface iteration we might have changed the
1319          * delayed_flags, time to handles the event by calling
1320          * the work handler directly.
1321          */
1322         rt2x00lib_intf_scheduled(&rt2x00dev->intf_work);
1323
1324         return 0;
1325
1326 exit:
1327         rt2x00lib_disable_radio(rt2x00dev);
1328         rt2x00lib_uninitialize(rt2x00dev);
1329         rt2x00debug_deregister(rt2x00dev);
1330
1331         return retval;
1332 }
1333 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1334 #endif /* CONFIG_PM */
1335
1336 /*
1337  * rt2x00lib module information.
1338  */
1339 MODULE_AUTHOR(DRV_PROJECT);
1340 MODULE_VERSION(DRV_VERSION);
1341 MODULE_DESCRIPTION("rt2x00 library");
1342 MODULE_LICENSE("GPL");