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
  32 /*
  33  * Link tuning handlers
  34  */
  35 void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
  36 {
  37         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  38                 return;
  39
  40         /*
  41          * Reset link information.
  42          * Both the currently active vgc level as well as
  43          * the link tuner counter should be reset. Resetting
  44          * the counter is important for devices where the
  45          * device should only perform link tuning during the
  46          * first minute after being enabled.
  47          */
  48         rt2x00dev->link.count = 0;
  49         rt2x00dev->link.vgc_level = 0;
  50
  51         /*
  52          * Reset the link tuner.
  53          */
  54         rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
  55 }
  56
  57 static void rt2x00lib_start_link_tuner(struct rt2x00_dev *rt2x00dev)
  58 {
  59         /*
  60          * Clear all (possibly) pre-existing quality statistics.
  61          */
  62         memset(&rt2x00dev->link.qual, 0, sizeof(rt2x00dev->link.qual));
  63
  64         /*
  65          * The RX and TX percentage should start at 50%
  66          * this will assure we will get at least get some
  67          * decent value when the link tuner starts.
  68          * The value will be dropped and overwritten with
  69          * the correct (measured )value anyway during the
  70          * first run of the link tuner.
  71          */
  72         rt2x00dev->link.qual.rx_percentage = 50;
  73         rt2x00dev->link.qual.tx_percentage = 50;
  74
  75         rt2x00lib_reset_link_tuner(rt2x00dev);
  76
  77         queue_delayed_work(rt2x00dev->hw->workqueue,
  78                            &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
  79 }
  80
  81 static void rt2x00lib_stop_link_tuner(struct rt2x00_dev *rt2x00dev)
  82 {
  83         cancel_delayed_work_sync(&rt2x00dev->link.work);
  84 }
  85
  86 /*
  87  * Radio control handlers.
  88  */
  89 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  90 {
  91         int status;
  92
  93         /*
  94          * Don't enable the radio twice.
  95          * And check if the hardware button has been disabled.
  96          */
  97         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags) ||
  98             test_bit(DEVICE_STATE_DISABLED_RADIO_HW, &rt2x00dev->flags))
  99                 return 0;
 100
 101         /*
 102          * Initialize all data queues.
 103          */
 104         rt2x00queue_init_queues(rt2x00dev);
 105
 106         /*
 107          * Enable radio.
 108          */
 109         status =
 110             rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
 111         if (status)
 112                 return status;
 113
 114         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
 115
 116         rt2x00leds_led_radio(rt2x00dev, true);
 117         rt2x00led_led_activity(rt2x00dev, true);
 118
 119         set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
 120
 121         /*
 122          * Enable RX.
 123          */
 124         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 125
 126         /*
 127          * Start the TX queues.
 128          */
 129         ieee80211_wake_queues(rt2x00dev->hw);
 130
 131         return 0;
 132 }
 133
 134 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
 135 {
 136         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 137                 return;
 138
 139         /*
 140          * Stop the TX queues.
 141          */
 142         ieee80211_stop_queues(rt2x00dev->hw);
 143
 144         /*
 145          * Disable RX.
 146          */
 147         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 148
 149         /*
 150          * Disable radio.
 151          */
 152         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 153         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 154         rt2x00led_led_activity(rt2x00dev, false);
 155         rt2x00leds_led_radio(rt2x00dev, false);
 156 }
 157
 158 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 159 {
 160         /*
 161          * When we are disabling the RX, we should also stop the link tuner.
 162          */
 163         if (state == STATE_RADIO_RX_OFF)
 164                 rt2x00lib_stop_link_tuner(rt2x00dev);
 165
 166         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 167
 168         /*
 169          * When we are enabling the RX, we should also start the link tuner.
 170          */
 171         if (state == STATE_RADIO_RX_ON &&
 172             (rt2x00dev->intf_ap_count || rt2x00dev->intf_sta_count))
 173                 rt2x00lib_start_link_tuner(rt2x00dev);
 174 }
 175
 176 static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev *rt2x00dev)
 177 {
 178         struct antenna_setup ant;
 179         int sample_a =
 180             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_A);
 181         int sample_b =
 182             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_B);
 183
 184         memcpy(&ant, &rt2x00dev->link.ant.active, sizeof(ant));
 185
 186         /*
 187          * We are done sampling. Now we should evaluate the results.
 188          */
 189         rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
 190
 191         /*
 192          * During the last period we have sampled the RSSI
 193          * from both antenna's. It now is time to determine
 194          * which antenna demonstrated the best performance.
 195          * When we are already on the antenna with the best
 196          * performance, then there really is nothing for us
 197          * left to do.
 198          */
 199         if (sample_a == sample_b)
 200                 return;
 201
 202         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 203                 ant.rx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 204
 205         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 206                 ant.tx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 207
 208         rt2x00lib_config_antenna(rt2x00dev, &ant);
 209 }
 210
 211 static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
 212 {
 213         struct antenna_setup ant;
 214         int rssi_curr = rt2x00_get_link_ant_rssi(&rt2x00dev->link);
 215         int rssi_old = rt2x00_update_ant_rssi(&rt2x00dev->link, rssi_curr);
 216
 217         memcpy(&ant, &rt2x00dev->link.ant.active, sizeof(ant));
 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                 ant.rx = (ant.rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 235
 236         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 237                 ant.tx = (ant.tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 238
 239         rt2x00lib_config_antenna(rt2x00dev, &ant);
 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->default_ant.rx == ANTENNA_SW_DIVERSITY)
 254                 rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
 255         if (rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY)
 256                 rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;
 257
 258         if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&
 259             !(rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)) {
 260                 rt2x00dev->link.ant.flags = 0;
 261                 return;
 262         }
 263
 264         /*
 265          * If we have only sampled the data over the last period
 266          * we should now harvest the data. Otherwise just evaluate
 267          * the data. The latter should only be performed once
 268          * every 2 seconds.
 269          */
 270         if (rt2x00dev->link.ant.flags & ANTENNA_MODE_SAMPLE)
 271                 rt2x00lib_evaluate_antenna_sample(rt2x00dev);
 272         else if (rt2x00dev->link.count & 1)
 273                 rt2x00lib_evaluate_antenna_eval(rt2x00dev);
 274 }
 275
 276 static void rt2x00lib_update_link_stats(struct link *link, int rssi)
 277 {
 278         int avg_rssi = rssi;
 279
 280         /*
 281          * Update global RSSI
 282          */
 283         if (link->qual.avg_rssi)
 284                 avg_rssi = MOVING_AVERAGE(link->qual.avg_rssi, rssi, 8);
 285         link->qual.avg_rssi = avg_rssi;
 286
 287         /*
 288          * Update antenna RSSI
 289          */
 290         if (link->ant.rssi_ant)
 291                 rssi = MOVING_AVERAGE(link->ant.rssi_ant, rssi, 8);
 292         link->ant.rssi_ant = rssi;
 293 }
 294
 295 static void rt2x00lib_precalculate_link_signal(struct link_qual *qual)
 296 {
 297         if (qual->rx_failed || qual->rx_success)
 298                 qual->rx_percentage =
 299                     (qual->rx_success * 100) /
 300                     (qual->rx_failed + qual->rx_success);
 301         else
 302                 qual->rx_percentage = 50;
 303
 304         if (qual->tx_failed || qual->tx_success)
 305                 qual->tx_percentage =
 306                     (qual->tx_success * 100) /
 307                     (qual->tx_failed + qual->tx_success);
 308         else
 309                 qual->tx_percentage = 50;
 310
 311         qual->rx_success = 0;
 312         qual->rx_failed = 0;
 313         qual->tx_success = 0;
 314         qual->tx_failed = 0;
 315 }
 316
 317 static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
 318                                            int rssi)
 319 {
 320         int rssi_percentage = 0;
 321         int signal;
 322
 323         /*
 324          * We need a positive value for the RSSI.
 325          */
 326         if (rssi < 0)
 327                 rssi += rt2x00dev->rssi_offset;
 328
 329         /*
 330          * Calculate the different percentages,
 331          * which will be used for the signal.
 332          */
 333         if (rt2x00dev->rssi_offset)
 334                 rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
 335
 336         /*
 337          * Add the individual percentages and use the WEIGHT
 338          * defines to calculate the current link signal.
 339          */
 340         signal = ((WEIGHT_RSSI * rssi_percentage) +
 341                   (WEIGHT_TX * rt2x00dev->link.qual.tx_percentage) +
 342                   (WEIGHT_RX * rt2x00dev->link.qual.rx_percentage)) / 100;
 343
 344         return (signal > 100) ? 100 : signal;
 345 }
 346
 347 static void rt2x00lib_link_tuner(struct work_struct *work)
 348 {
 349         struct rt2x00_dev *rt2x00dev =
 350             container_of(work, struct rt2x00_dev, link.work.work);
 351
 352         /*
 353          * When the radio is shutting down we should
 354          * immediately cease all link tuning.
 355          */
 356         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 357                 return;
 358
 359         /*
 360          * Update statistics.
 361          */
 362         rt2x00dev->ops->lib->link_stats(rt2x00dev, &rt2x00dev->link.qual);
 363         rt2x00dev->low_level_stats.dot11FCSErrorCount +=
 364             rt2x00dev->link.qual.rx_failed;
 365
 366         /*
 367          * Only perform the link tuning when Link tuning
 368          * has been enabled (This could have been disabled from the EEPROM).
 369          */
 370         if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
 371                 rt2x00dev->ops->lib->link_tuner(rt2x00dev);
 372
 373         /*
 374          * Precalculate a portion of the link signal which is
 375          * in based on the tx/rx success/failure counters.
 376          */
 377         rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
 378
 379         /*
 380          * Send a signal to the led to update the led signal strength.
 381          */
 382         rt2x00leds_led_quality(rt2x00dev, rt2x00dev->link.qual.avg_rssi);
 383
 384         /*
 385          * Evaluate antenna setup, make this the last step since this could
 386          * possibly reset some statistics.
 387          */
 388         rt2x00lib_evaluate_antenna(rt2x00dev);
 389
 390         /*
 391          * Increase tuner counter, and reschedule the next link tuner run.
 392          */
 393         rt2x00dev->link.count++;
 394         queue_delayed_work(rt2x00dev->hw->workqueue,
 395                            &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
 396 }
 397
 398 static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
 399 {
 400         struct rt2x00_dev *rt2x00dev =
 401             container_of(work, struct rt2x00_dev, filter_work);
 402
 403         rt2x00dev->ops->lib->config_filter(rt2x00dev, rt2x00dev->packet_filter);
 404 }
 405
 406 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 407                                           struct ieee80211_vif *vif)
 408 {
 409         struct rt2x00_dev *rt2x00dev = data;
 410         struct rt2x00_intf *intf = vif_to_intf(vif);
 411         struct ieee80211_bss_conf conf;
 412         int delayed_flags;
 413
 414         /*
 415          * Copy all data we need during this action under the protection
 416          * of a spinlock. Otherwise race conditions might occur which results
 417          * into an invalid configuration.
 418          */
 419         spin_lock(&intf->lock);
 420
 421         memcpy(&conf, &vif->bss_conf, sizeof(conf));
 422         delayed_flags = intf->delayed_flags;
 423         intf->delayed_flags = 0;
 424
 425         spin_unlock(&intf->lock);
 426
 427         /*
 428          * It is possible the radio was disabled while the work had been
 429          * scheduled. If that happens we should return here immediately,
 430          * note that in the spinlock protected area above the delayed_flags
 431          * have been cleared correctly.
 432          */
 433         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 434                 return;
 435
 436         if (delayed_flags & DELAYED_UPDATE_BEACON)
 437                 rt2x00queue_update_beacon(rt2x00dev, vif);
 438
 439         if (delayed_flags & DELAYED_CONFIG_ERP)
 440                 rt2x00lib_config_erp(rt2x00dev, intf, &conf);
 441
 442         if (delayed_flags & DELAYED_LED_ASSOC)
 443                 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
 444 }
 445
 446 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 447 {
 448         struct rt2x00_dev *rt2x00dev =
 449             container_of(work, struct rt2x00_dev, intf_work);
 450
 451         /*
 452          * Iterate over each interface and perform the
 453          * requested configurations.
 454          */
 455         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 456                                             rt2x00lib_intf_scheduled_iter,
 457                                             rt2x00dev);
 458 }
 459
 460 /*
 461  * Interrupt context handlers.
 462  */
 463 static void rt2x00lib_beacondone_iter(void *data, u8 *mac,
 464                                       struct ieee80211_vif *vif)
 465 {
 466         struct rt2x00_dev *rt2x00dev = data;
 467         struct rt2x00_intf *intf = vif_to_intf(vif);
 468
 469         if (vif->type != NL80211_IFTYPE_AP &&
 470             vif->type != NL80211_IFTYPE_ADHOC)
 471                 return;
 472
 473         /*
 474          * Clean up the beacon skb.
 475          */
 476         rt2x00queue_free_skb(rt2x00dev, intf->beacon->skb);
 477         intf->beacon->skb = NULL;
 478
 479         spin_lock(&intf->lock);
 480         intf->delayed_flags |= DELAYED_UPDATE_BEACON;
 481         spin_unlock(&intf->lock);
 482 }
 483
 484 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 485 {
 486         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 487                 return;
 488
 489         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 490                                                    rt2x00lib_beacondone_iter,
 491                                                    rt2x00dev);
 492
 493         schedule_work(&rt2x00dev->intf_work);
 494 }
 495 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 496
 497 void rt2x00lib_txdone(struct queue_entry *entry,
 498                       struct txdone_entry_desc *txdesc)
 499 {
 500         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 501         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 502         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 503         enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
 504         u8 rate_idx, rate_flags;
 505
 506         /*
 507          * Unmap the skb.
 508          */
 509         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 510
 511         /*
 512          * If the IV/EIV data was stripped from the frame before it was
 513          * passed to the hardware, we should now reinsert it again because
 514          * mac80211 will expect the the same data to be present it the
 515          * frame as it was passed to us.
 516          */
 517         if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
 518                 rt2x00crypto_tx_insert_iv(entry->skb);
 519
 520         /*
 521          * Send frame to debugfs immediately, after this call is completed
 522          * we are going to overwrite the skb->cb array.
 523          */
 524         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 525
 526         /*
 527          * Update TX statistics.
 528          */
 529         rt2x00dev->link.qual.tx_success +=
 530             test_bit(TXDONE_SUCCESS, &txdesc->flags);
 531         rt2x00dev->link.qual.tx_failed +=
 532             test_bit(TXDONE_FAILURE, &txdesc->flags);
 533
 534         rate_idx = skbdesc->tx_rate_idx;
 535         rate_flags = skbdesc->tx_rate_flags;
 536
 537         /*
 538          * Initialize TX status
 539          */
 540         memset(&tx_info->status, 0, sizeof(tx_info->status));
 541         tx_info->status.ack_signal = 0;
 542         tx_info->status.rates[0].idx = rate_idx;
 543         tx_info->status.rates[0].flags = rate_flags;
 544         tx_info->status.rates[0].count = txdesc->retry + 1;
 545         tx_info->status.rates[1].idx = -1; /* terminate */
 546
 547         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 548                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 549                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 550                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 551                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 552         }
 553
 554         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 555                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 556                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 557                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 558                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 559         }
 560
 561         /*
 562          * Only send the status report to mac80211 when TX status was
 563          * requested by it. If this was a extra frame coming through
 564          * a mac80211 library call (RTS/CTS) then we should not send the
 565          * status report back.
 566          */
 567         if (tx_info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)
 568                 ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb);
 569         else
 570                 dev_kfree_skb_irq(entry->skb);
 571
 572         /*
 573          * Make this entry available for reuse.
 574          */
 575         entry->skb = NULL;
 576         entry->flags = 0;
 577
 578         rt2x00dev->ops->lib->clear_entry(entry);
 579
 580         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 581         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 582
 583         /*
 584          * If the data queue was below the threshold before the txdone
 585          * handler we must make sure the packet queue in the mac80211 stack
 586          * is reenabled when the txdone handler has finished.
 587          */
 588         if (!rt2x00queue_threshold(entry->queue))
 589                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 590 }
 591 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 592
 593 void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
 594                       struct queue_entry *entry)
 595 {
 596         struct rxdone_entry_desc rxdesc;
 597         struct sk_buff *skb;
 598         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 599         struct ieee80211_supported_band *sband;
 600         struct ieee80211_hdr *hdr;
 601         const struct rt2x00_rate *rate;
 602         unsigned int header_length;
 603         unsigned int align;
 604         unsigned int i;
 605         int idx = -1;
 606
 607         /*
 608          * Allocate a new sk_buffer. If no new buffer available, drop the
 609          * received frame and reuse the existing buffer.
 610          */
 611         skb = rt2x00queue_alloc_rxskb(rt2x00dev, entry);
 612         if (!skb)
 613                 return;
 614
 615         /*
 616          * Unmap the skb.
 617          */
 618         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 619
 620         /*
 621          * Extract the RXD details.
 622          */
 623         memset(&rxdesc, 0, sizeof(rxdesc));
 624         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 625
 626         /*
 627          * The data behind the ieee80211 header must be
 628          * aligned on a 4 byte boundary.
 629          */
 630         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 631         align = ((unsigned long)(entry->skb->data + header_length)) & 3;
 632
 633         /*
 634          * Hardware might have stripped the IV/EIV/ICV data,
 635          * in that case it is possible that the data was
 636          * provided seperately (through hardware descriptor)
 637          * in which case we should reinsert the data into the frame.
 638          */
 639         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 640             (rxdesc.flags & RX_FLAG_IV_STRIPPED)) {
 641                 rt2x00crypto_rx_insert_iv(entry->skb, align,
 642                                           header_length, &rxdesc);
 643         } else if (align) {
 644                 skb_push(entry->skb, align);
 645                 /* Move entire frame in 1 command */
 646                 memmove(entry->skb->data, entry->skb->data + align,
 647                         rxdesc.size);
 648         }
 649
 650         /* Update data pointers, trim buffer to correct size */
 651         skb_trim(entry->skb, rxdesc.size);
 652
 653         /*
 654          * Update RX statistics.
 655          */
 656         sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 657         for (i = 0; i < sband->n_bitrates; i++) {
 658                 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 659
 660                 if (((rxdesc.dev_flags & RXDONE_SIGNAL_PLCP) &&
 661                      (rate->plcp == rxdesc.signal)) ||
 662                     ((rxdesc.dev_flags & RXDONE_SIGNAL_BITRATE) &&
 663                       (rate->bitrate == rxdesc.signal))) {
 664                         idx = i;
 665                         break;
 666                 }
 667         }
 668
 669         if (idx < 0) {
 670                 WARNING(rt2x00dev, "Frame received with unrecognized signal,"
 671                         "signal=0x%.2x, plcp=%d.\n", rxdesc.signal,
 672                         !!(rxdesc.dev_flags & RXDONE_SIGNAL_PLCP));
 673                 idx = 0;
 674         }
 675
 676         /*
 677          * Only update link status if this is a beacon frame carrying our bssid.
 678          */
 679         hdr = (struct ieee80211_hdr *)entry->skb->data;
 680         if (ieee80211_is_beacon(hdr->frame_control) &&
 681             (rxdesc.dev_flags & RXDONE_MY_BSS))
 682                 rt2x00lib_update_link_stats(&rt2x00dev->link, rxdesc.rssi);
 683
 684         rt2x00debug_update_crypto(rt2x00dev,
 685                                   rxdesc.cipher,
 686                                   rxdesc.cipher_status);
 687
 688         rt2x00dev->link.qual.rx_success++;
 689
 690         rx_status->mactime = rxdesc.timestamp;
 691         rx_status->rate_idx = idx;
 692         rx_status->qual =
 693             rt2x00lib_calculate_link_signal(rt2x00dev, rxdesc.rssi);
 694         rx_status->signal = rxdesc.rssi;
 695         rx_status->flag = rxdesc.flags;
 696         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 697
 698         /*
 699          * Send frame to mac80211 & debugfs.
 700          * mac80211 will clean up the skb structure.
 701          */
 702         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 703         ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb, rx_status);
 704
 705         /*
 706          * Replace the skb with the freshly allocated one.
 707          */
 708         entry->skb = skb;
 709         entry->flags = 0;
 710
 711         rt2x00dev->ops->lib->clear_entry(entry);
 712
 713         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 714 }
 715 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 716
 717 /*
 718  * Driver initialization handlers.
 719  */
 720 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 721         {
 722                 .flags = DEV_RATE_CCK,
 723                 .bitrate = 10,
 724                 .ratemask = BIT(0),
 725                 .plcp = 0x00,
 726         },
 727         {
 728                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 729                 .bitrate = 20,
 730                 .ratemask = BIT(1),
 731                 .plcp = 0x01,
 732         },
 733         {
 734                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 735                 .bitrate = 55,
 736                 .ratemask = BIT(2),
 737                 .plcp = 0x02,
 738         },
 739         {
 740                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 741                 .bitrate = 110,
 742                 .ratemask = BIT(3),
 743                 .plcp = 0x03,
 744         },
 745         {
 746                 .flags = DEV_RATE_OFDM,
 747                 .bitrate = 60,
 748                 .ratemask = BIT(4),
 749                 .plcp = 0x0b,
 750         },
 751         {
 752                 .flags = DEV_RATE_OFDM,
 753                 .bitrate = 90,
 754                 .ratemask = BIT(5),
 755                 .plcp = 0x0f,
 756         },
 757         {
 758                 .flags = DEV_RATE_OFDM,
 759                 .bitrate = 120,
 760                 .ratemask = BIT(6),
 761                 .plcp = 0x0a,
 762         },
 763         {
 764                 .flags = DEV_RATE_OFDM,
 765                 .bitrate = 180,
 766                 .ratemask = BIT(7),
 767                 .plcp = 0x0e,
 768         },
 769         {
 770                 .flags = DEV_RATE_OFDM,
 771                 .bitrate = 240,
 772                 .ratemask = BIT(8),
 773                 .plcp = 0x09,
 774         },
 775         {
 776                 .flags = DEV_RATE_OFDM,
 777                 .bitrate = 360,
 778                 .ratemask = BIT(9),
 779                 .plcp = 0x0d,
 780         },
 781         {
 782                 .flags = DEV_RATE_OFDM,
 783                 .bitrate = 480,
 784                 .ratemask = BIT(10),
 785                 .plcp = 0x08,
 786         },
 787         {
 788                 .flags = DEV_RATE_OFDM,
 789                 .bitrate = 540,
 790                 .ratemask = BIT(11),
 791                 .plcp = 0x0c,
 792         },
 793 };
 794
 795 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 796                               const int channel, const int tx_power,
 797                               const int value)
 798 {
 799         entry->center_freq = ieee80211_channel_to_frequency(channel);
 800         entry->hw_value = value;
 801         entry->max_power = tx_power;
 802         entry->max_antenna_gain = 0xff;
 803 }
 804
 805 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 806                            const u16 index, const struct rt2x00_rate *rate)
 807 {
 808         entry->flags = 0;
 809         entry->bitrate = rate->bitrate;
 810         entry->hw_value =index;
 811         entry->hw_value_short = index;
 812
 813         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 814                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 815 }
 816
 817 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 818                                     struct hw_mode_spec *spec)
 819 {
 820         struct ieee80211_hw *hw = rt2x00dev->hw;
 821         struct ieee80211_channel *channels;
 822         struct ieee80211_rate *rates;
 823         unsigned int num_rates;
 824         unsigned int i;
 825
 826         num_rates = 0;
 827         if (spec->supported_rates & SUPPORT_RATE_CCK)
 828                 num_rates += 4;
 829         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 830                 num_rates += 8;
 831
 832         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 833         if (!channels)
 834                 return -ENOMEM;
 835
 836         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 837         if (!rates)
 838                 goto exit_free_channels;
 839
 840         /*
 841          * Initialize Rate list.
 842          */
 843         for (i = 0; i < num_rates; i++)
 844                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 845
 846         /*
 847          * Initialize Channel list.
 848          */
 849         for (i = 0; i < spec->num_channels; i++) {
 850                 rt2x00lib_channel(&channels[i],
 851                                   spec->channels[i].channel,
 852                                   spec->channels_info[i].tx_power1, i);
 853         }
 854
 855         /*
 856          * Intitialize 802.11b, 802.11g
 857          * Rates: CCK, OFDM.
 858          * Channels: 2.4 GHz
 859          */
 860         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 861                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 862                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 863                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 864                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 865                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 866                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 867         }
 868
 869         /*
 870          * Intitialize 802.11a
 871          * Rates: OFDM.
 872          * Channels: OFDM, UNII, HiperLAN2.
 873          */
 874         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 875                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 876                     spec->num_channels - 14;
 877                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 878                     num_rates - 4;
 879                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 880                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 881                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 882                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 883         }
 884
 885         return 0;
 886
 887  exit_free_channels:
 888         kfree(channels);
 889         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 890         return -ENOMEM;
 891 }
 892
 893 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 894 {
 895         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 896                 ieee80211_unregister_hw(rt2x00dev->hw);
 897
 898         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 899                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 900                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 901                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 902                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 903         }
 904
 905         kfree(rt2x00dev->spec.channels_info);
 906 }
 907
 908 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 909 {
 910         struct hw_mode_spec *spec = &rt2x00dev->spec;
 911         int status;
 912
 913         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 914                 return 0;
 915
 916         /*
 917          * Initialize HW modes.
 918          */
 919         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 920         if (status)
 921                 return status;
 922
 923         /*
 924          * Initialize HW fields.
 925          */
 926         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 927
 928         /*
 929          * Register HW.
 930          */
 931         status = ieee80211_register_hw(rt2x00dev->hw);
 932         if (status) {
 933                 rt2x00lib_remove_hw(rt2x00dev);
 934                 return status;
 935         }
 936
 937         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 938
 939         return 0;
 940 }
 941
 942 /*
 943  * Initialization/uninitialization handlers.
 944  */
 945 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 946 {
 947         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 948                 return;
 949
 950         /*
 951          * Unregister extra components.
 952          */
 953         rt2x00rfkill_unregister(rt2x00dev);
 954
 955         /*
 956          * Allow the HW to uninitialize.
 957          */
 958         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 959
 960         /*
 961          * Free allocated queue entries.
 962          */
 963         rt2x00queue_uninitialize(rt2x00dev);
 964 }
 965
 966 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 967 {
 968         int status;
 969
 970         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 971                 return 0;
 972
 973         /*
 974          * Allocate all queue entries.
 975          */
 976         status = rt2x00queue_initialize(rt2x00dev);
 977         if (status)
 978                 return status;
 979
 980         /*
 981          * Initialize the device.
 982          */
 983         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 984         if (status) {
 985                 rt2x00queue_uninitialize(rt2x00dev);
 986                 return status;
 987         }
 988
 989         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
 990
 991         /*
 992          * Register the extra components.
 993          */
 994         rt2x00rfkill_register(rt2x00dev);
 995
 996         return 0;
 997 }
 998
 999 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1000 {
1001         int retval;
1002
1003         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1004                 return 0;
1005
1006         /*
1007          * If this is the first interface which is added,
1008          * we should load the firmware now.
1009          */
1010         retval = rt2x00lib_load_firmware(rt2x00dev);
1011         if (retval)
1012                 return retval;
1013
1014         /*
1015          * Initialize the device.
1016          */
1017         retval = rt2x00lib_initialize(rt2x00dev);
1018         if (retval)
1019                 return retval;
1020
1021         rt2x00dev->intf_ap_count = 0;
1022         rt2x00dev->intf_sta_count = 0;
1023         rt2x00dev->intf_associated = 0;
1024
1025         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
1026
1027         return 0;
1028 }
1029
1030 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1031 {
1032         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1033                 return;
1034
1035         /*
1036          * Perhaps we can add something smarter here,
1037          * but for now just disabling the radio should do.
1038          */
1039         rt2x00lib_disable_radio(rt2x00dev);
1040
1041         rt2x00dev->intf_ap_count = 0;
1042         rt2x00dev->intf_sta_count = 0;
1043         rt2x00dev->intf_associated = 0;
1044 }
1045
1046 /*
1047  * driver allocation handlers.
1048  */
1049 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1050 {
1051         int retval = -ENOMEM;
1052
1053         mutex_init(&rt2x00dev->csr_mutex);
1054
1055         /*
1056          * Make room for rt2x00_intf inside the per-interface
1057          * structure ieee80211_vif.
1058          */
1059         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1060
1061         /*
1062          * Determine which operating modes are supported, all modes
1063          * which require beaconing, depend on the availability of
1064          * beacon entries.
1065          */
1066         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
1067         if (rt2x00dev->ops->bcn->entry_num > 0)
1068                 rt2x00dev->hw->wiphy->interface_modes |=
1069                     BIT(NL80211_IFTYPE_ADHOC) |
1070                     BIT(NL80211_IFTYPE_AP);
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          * Register extra components.
1106          */
1107         rt2x00leds_register(rt2x00dev);
1108         rt2x00rfkill_allocate(rt2x00dev);
1109         rt2x00debug_register(rt2x00dev);
1110
1111         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1112
1113         return 0;
1114
1115 exit:
1116         rt2x00lib_remove_dev(rt2x00dev);
1117
1118         return retval;
1119 }
1120 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1121
1122 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1123 {
1124         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1125
1126         /*
1127          * Disable radio.
1128          */
1129         rt2x00lib_disable_radio(rt2x00dev);
1130
1131         /*
1132          * Uninitialize device.
1133          */
1134         rt2x00lib_uninitialize(rt2x00dev);
1135
1136         /*
1137          * Free extra components
1138          */
1139         rt2x00debug_deregister(rt2x00dev);
1140         rt2x00rfkill_free(rt2x00dev);
1141         rt2x00leds_unregister(rt2x00dev);
1142
1143         /*
1144          * Free ieee80211_hw memory.
1145          */
1146         rt2x00lib_remove_hw(rt2x00dev);
1147
1148         /*
1149          * Free firmware image.
1150          */
1151         rt2x00lib_free_firmware(rt2x00dev);
1152
1153         /*
1154          * Free queue structures.
1155          */
1156         rt2x00queue_free(rt2x00dev);
1157 }
1158 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1159
1160 /*
1161  * Device state handlers
1162  */
1163 #ifdef CONFIG_PM
1164 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1165 {
1166         int retval;
1167
1168         NOTICE(rt2x00dev, "Going to sleep.\n");
1169
1170         /*
1171          * Only continue if mac80211 has open interfaces.
1172          */
1173         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
1174             !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1175                 goto exit;
1176
1177         set_bit(DEVICE_STATE_STARTED_SUSPEND, &rt2x00dev->flags);
1178
1179         /*
1180          * Disable radio.
1181          */
1182         rt2x00lib_stop(rt2x00dev);
1183         rt2x00lib_uninitialize(rt2x00dev);
1184
1185         /*
1186          * Suspend/disable extra components.
1187          */
1188         rt2x00leds_suspend(rt2x00dev);
1189         rt2x00debug_deregister(rt2x00dev);
1190
1191 exit:
1192         /*
1193          * Set device mode to sleep for power management,
1194          * on some hardware this call seems to consistently fail.
1195          * From the specifications it is hard to tell why it fails,
1196          * and if this is a "bad thing".
1197          * Overall it is safe to just ignore the failure and
1198          * continue suspending. The only downside is that the
1199          * device will not be in optimal power save mode, but with
1200          * the radio and the other components already disabled the
1201          * device is as good as disabled.
1202          */
1203         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1204         if (retval)
1205                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1206                         "continue suspending.\n");
1207
1208         return 0;
1209 }
1210 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1211
1212 static void rt2x00lib_resume_intf(void *data, u8 *mac,
1213                                   struct ieee80211_vif *vif)
1214 {
1215         struct rt2x00_dev *rt2x00dev = data;
1216         struct rt2x00_intf *intf = vif_to_intf(vif);
1217
1218         spin_lock(&intf->lock);
1219
1220         rt2x00lib_config_intf(rt2x00dev, intf,
1221                               vif->type, intf->mac, intf->bssid);
1222
1223
1224         /*
1225          * Master or Ad-hoc mode require a new beacon update.
1226          */
1227         if (vif->type == NL80211_IFTYPE_AP ||
1228             vif->type == NL80211_IFTYPE_ADHOC)
1229                 intf->delayed_flags |= DELAYED_UPDATE_BEACON;
1230
1231         spin_unlock(&intf->lock);
1232 }
1233
1234 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1235 {
1236         int retval;
1237
1238         NOTICE(rt2x00dev, "Waking up.\n");
1239
1240         /*
1241          * Restore/enable extra components.
1242          */
1243         rt2x00debug_register(rt2x00dev);
1244         rt2x00leds_resume(rt2x00dev);
1245
1246         /*
1247          * Only continue if mac80211 had open interfaces.
1248          */
1249         if (!test_and_clear_bit(DEVICE_STATE_STARTED_SUSPEND, &rt2x00dev->flags))
1250                 return 0;
1251
1252         /*
1253          * Reinitialize device and all active interfaces.
1254          */
1255         retval = rt2x00lib_start(rt2x00dev);
1256         if (retval)
1257                 goto exit;
1258
1259         /*
1260          * Reconfigure device.
1261          */
1262         retval = rt2x00mac_config(rt2x00dev->hw, ~0);
1263         if (retval)
1264                 goto exit;
1265
1266         /*
1267          * Iterator over each active interface to
1268          * reconfigure the hardware.
1269          */
1270         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
1271                                             rt2x00lib_resume_intf, rt2x00dev);
1272
1273         /*
1274          * We are ready again to receive requests from mac80211.
1275          */
1276         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1277
1278         /*
1279          * It is possible that during that mac80211 has attempted
1280          * to send frames while we were suspending or resuming.
1281          * In that case we have disabled the TX queue and should
1282          * now enable it again
1283          */
1284         ieee80211_wake_queues(rt2x00dev->hw);
1285
1286         /*
1287          * During interface iteration we might have changed the
1288          * delayed_flags, time to handles the event by calling
1289          * the work handler directly.
1290          */
1291         rt2x00lib_intf_scheduled(&rt2x00dev->intf_work);
1292
1293         return 0;
1294
1295 exit:
1296         rt2x00lib_stop(rt2x00dev);
1297         rt2x00lib_uninitialize(rt2x00dev);
1298         rt2x00debug_deregister(rt2x00dev);
1299
1300         return retval;
1301 }
1302 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1303 #endif /* CONFIG_PM */
1304
1305 /*
1306  * rt2x00lib module information.
1307  */
1308 MODULE_AUTHOR(DRV_PROJECT);
1309 MODULE_VERSION(DRV_VERSION);
1310 MODULE_DESCRIPTION("rt2x00 library");
1311 MODULE_LICENSE("GPL");