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_rx(rt2x00dev);
 105         rt2x00queue_init_tx(rt2x00dev);
 106
 107         /*
 108          * Enable radio.
 109          */
 110         status =
 111             rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
 112         if (status)
 113                 return status;
 114
 115         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
 116
 117         rt2x00leds_led_radio(rt2x00dev, true);
 118         rt2x00led_led_activity(rt2x00dev, true);
 119
 120         set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
 121
 122         /*
 123          * Enable RX.
 124          */
 125         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 126
 127         /*
 128          * Start the TX queues.
 129          */
 130         ieee80211_wake_queues(rt2x00dev->hw);
 131
 132         return 0;
 133 }
 134
 135 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
 136 {
 137         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 138                 return;
 139
 140         /*
 141          * Stop the TX queues.
 142          */
 143         ieee80211_stop_queues(rt2x00dev->hw);
 144
 145         /*
 146          * Disable RX.
 147          */
 148         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 149
 150         /*
 151          * Disable radio.
 152          */
 153         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 154         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 155         rt2x00led_led_activity(rt2x00dev, false);
 156         rt2x00leds_led_radio(rt2x00dev, false);
 157 }
 158
 159 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 160 {
 161         /*
 162          * When we are disabling the RX, we should also stop the link tuner.
 163          */
 164         if (state == STATE_RADIO_RX_OFF)
 165                 rt2x00lib_stop_link_tuner(rt2x00dev);
 166
 167         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 168
 169         /*
 170          * When we are enabling the RX, we should also start the link tuner.
 171          */
 172         if (state == STATE_RADIO_RX_ON &&
 173             (rt2x00dev->intf_ap_count || rt2x00dev->intf_sta_count))
 174                 rt2x00lib_start_link_tuner(rt2x00dev);
 175 }
 176
 177 static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev *rt2x00dev)
 178 {
 179         enum antenna rx = rt2x00dev->link.ant.active.rx;
 180         enum antenna tx = rt2x00dev->link.ant.active.tx;
 181         int sample_a =
 182             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_A);
 183         int sample_b =
 184             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_B);
 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                 rx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 204
 205         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 206                 tx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 207
 208         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 209 }
 210
 211 static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
 212 {
 213         enum antenna rx = rt2x00dev->link.ant.active.rx;
 214         enum antenna tx = rt2x00dev->link.ant.active.tx;
 215         int rssi_curr = rt2x00_get_link_ant_rssi(&rt2x00dev->link);
 216         int rssi_old = rt2x00_update_ant_rssi(&rt2x00dev->link, rssi_curr);
 217
 218         /*
 219          * Legacy driver indicates that we should swap antenna's
 220          * when the difference in RSSI is greater that 5. This
 221          * also should be done when the RSSI was actually better
 222          * then the previous sample.
 223          * When the difference exceeds the threshold we should
 224          * sample the rssi from the other antenna to make a valid
 225          * comparison between the 2 antennas.
 226          */
 227         if (abs(rssi_curr - rssi_old) < 5)
 228                 return;
 229
 230         rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;
 231
 232         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 233                 rx = (rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 234
 235         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 236                 tx = (tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 237
 238         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 239 }
 240
 241 static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
 242 {
 243         /*
 244          * Determine if software diversity is enabled for
 245          * either the TX or RX antenna (or both).
 246          * Always perform this check since within the link
 247          * tuner interval the configuration might have changed.
 248          */
 249         rt2x00dev->link.ant.flags &= ~ANTENNA_RX_DIVERSITY;
 250         rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;
 251
 252         if (rt2x00dev->hw->conf.antenna_sel_rx == 0 &&
 253             rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY)
 254                 rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
 255         if (rt2x00dev->hw->conf.antenna_sel_tx == 0 &&
 256             rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY)
 257                 rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;
 258
 259         if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&
 260             !(rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)) {
 261                 rt2x00dev->link.ant.flags = 0;
 262                 return;
 263         }
 264
 265         /*
 266          * If we have only sampled the data over the last period
 267          * we should now harvest the data. Otherwise just evaluate
 268          * the data. The latter should only be performed once
 269          * every 2 seconds.
 270          */
 271         if (rt2x00dev->link.ant.flags & ANTENNA_MODE_SAMPLE)
 272                 rt2x00lib_evaluate_antenna_sample(rt2x00dev);
 273         else if (rt2x00dev->link.count & 1)
 274                 rt2x00lib_evaluate_antenna_eval(rt2x00dev);
 275 }
 276
 277 static void rt2x00lib_update_link_stats(struct link *link, int rssi)
 278 {
 279         int avg_rssi = rssi;
 280
 281         /*
 282          * Update global RSSI
 283          */
 284         if (link->qual.avg_rssi)
 285                 avg_rssi = MOVING_AVERAGE(link->qual.avg_rssi, rssi, 8);
 286         link->qual.avg_rssi = avg_rssi;
 287
 288         /*
 289          * Update antenna RSSI
 290          */
 291         if (link->ant.rssi_ant)
 292                 rssi = MOVING_AVERAGE(link->ant.rssi_ant, rssi, 8);
 293         link->ant.rssi_ant = rssi;
 294 }
 295
 296 static void rt2x00lib_precalculate_link_signal(struct link_qual *qual)
 297 {
 298         if (qual->rx_failed || qual->rx_success)
 299                 qual->rx_percentage =
 300                     (qual->rx_success * 100) /
 301                     (qual->rx_failed + qual->rx_success);
 302         else
 303                 qual->rx_percentage = 50;
 304
 305         if (qual->tx_failed || qual->tx_success)
 306                 qual->tx_percentage =
 307                     (qual->tx_success * 100) /
 308                     (qual->tx_failed + qual->tx_success);
 309         else
 310                 qual->tx_percentage = 50;
 311
 312         qual->rx_success = 0;
 313         qual->rx_failed = 0;
 314         qual->tx_success = 0;
 315         qual->tx_failed = 0;
 316 }
 317
 318 static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
 319                                            int rssi)
 320 {
 321         int rssi_percentage = 0;
 322         int signal;
 323
 324         /*
 325          * We need a positive value for the RSSI.
 326          */
 327         if (rssi < 0)
 328                 rssi += rt2x00dev->rssi_offset;
 329
 330         /*
 331          * Calculate the different percentages,
 332          * which will be used for the signal.
 333          */
 334         if (rt2x00dev->rssi_offset)
 335                 rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
 336
 337         /*
 338          * Add the individual percentages and use the WEIGHT
 339          * defines to calculate the current link signal.
 340          */
 341         signal = ((WEIGHT_RSSI * rssi_percentage) +
 342                   (WEIGHT_TX * rt2x00dev->link.qual.tx_percentage) +
 343                   (WEIGHT_RX * rt2x00dev->link.qual.rx_percentage)) / 100;
 344
 345         return (signal > 100) ? 100 : signal;
 346 }
 347
 348 static void rt2x00lib_link_tuner(struct work_struct *work)
 349 {
 350         struct rt2x00_dev *rt2x00dev =
 351             container_of(work, struct rt2x00_dev, link.work.work);
 352
 353         /*
 354          * When the radio is shutting down we should
 355          * immediately cease all link tuning.
 356          */
 357         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 358                 return;
 359
 360         /*
 361          * Update statistics.
 362          */
 363         rt2x00dev->ops->lib->link_stats(rt2x00dev, &rt2x00dev->link.qual);
 364         rt2x00dev->low_level_stats.dot11FCSErrorCount +=
 365             rt2x00dev->link.qual.rx_failed;
 366
 367         /*
 368          * Only perform the link tuning when Link tuning
 369          * has been enabled (This could have been disabled from the EEPROM).
 370          */
 371         if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
 372                 rt2x00dev->ops->lib->link_tuner(rt2x00dev);
 373
 374         /*
 375          * Precalculate a portion of the link signal which is
 376          * in based on the tx/rx success/failure counters.
 377          */
 378         rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
 379
 380         /*
 381          * Send a signal to the led to update the led signal strength.
 382          */
 383         rt2x00leds_led_quality(rt2x00dev, rt2x00dev->link.qual.avg_rssi);
 384
 385         /*
 386          * Evaluate antenna setup, make this the last step since this could
 387          * possibly reset some statistics.
 388          */
 389         rt2x00lib_evaluate_antenna(rt2x00dev);
 390
 391         /*
 392          * Increase tuner counter, and reschedule the next link tuner run.
 393          */
 394         rt2x00dev->link.count++;
 395         queue_delayed_work(rt2x00dev->hw->workqueue,
 396                            &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
 397 }
 398
 399 static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
 400 {
 401         struct rt2x00_dev *rt2x00dev =
 402             container_of(work, struct rt2x00_dev, filter_work);
 403
 404         rt2x00dev->ops->lib->config_filter(rt2x00dev, rt2x00dev->packet_filter);
 405 }
 406
 407 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 408                                           struct ieee80211_vif *vif)
 409 {
 410         struct rt2x00_dev *rt2x00dev = data;
 411         struct rt2x00_intf *intf = vif_to_intf(vif);
 412         struct ieee80211_bss_conf conf;
 413         int delayed_flags;
 414
 415         /*
 416          * Copy all data we need during this action under the protection
 417          * of a spinlock. Otherwise race conditions might occur which results
 418          * into an invalid configuration.
 419          */
 420         spin_lock(&intf->lock);
 421
 422         memcpy(&conf, &intf->conf, sizeof(conf));
 423         delayed_flags = intf->delayed_flags;
 424         intf->delayed_flags = 0;
 425
 426         spin_unlock(&intf->lock);
 427
 428         /*
 429          * It is possible the radio was disabled while the work had been
 430          * scheduled. If that happens we should return here immediately,
 431          * note that in the spinlock protected area above the delayed_flags
 432          * have been cleared correctly.
 433          */
 434         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 435                 return;
 436
 437         if (delayed_flags & DELAYED_UPDATE_BEACON)
 438                 rt2x00queue_update_beacon(rt2x00dev, vif);
 439
 440         if (delayed_flags & DELAYED_CONFIG_ERP)
 441                 rt2x00lib_config_erp(rt2x00dev, intf, &conf);
 442
 443         if (delayed_flags & DELAYED_LED_ASSOC)
 444                 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
 445 }
 446
 447 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 448 {
 449         struct rt2x00_dev *rt2x00dev =
 450             container_of(work, struct rt2x00_dev, intf_work);
 451
 452         /*
 453          * Iterate over each interface and perform the
 454          * requested configurations.
 455          */
 456         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 457                                             rt2x00lib_intf_scheduled_iter,
 458                                             rt2x00dev);
 459 }
 460
 461 /*
 462  * Interrupt context handlers.
 463  */
 464 static void rt2x00lib_beacondone_iter(void *data, u8 *mac,
 465                                       struct ieee80211_vif *vif)
 466 {
 467         struct rt2x00_dev *rt2x00dev = data;
 468         struct rt2x00_intf *intf = vif_to_intf(vif);
 469
 470         if (vif->type != IEEE80211_IF_TYPE_AP &&
 471             vif->type != IEEE80211_IF_TYPE_IBSS)
 472                 return;
 473
 474         /*
 475          * Clean up the beacon skb.
 476          */
 477         rt2x00queue_free_skb(rt2x00dev, intf->beacon->skb);
 478         intf->beacon->skb = NULL;
 479
 480         spin_lock(&intf->lock);
 481         intf->delayed_flags |= DELAYED_UPDATE_BEACON;
 482         spin_unlock(&intf->lock);
 483 }
 484
 485 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 486 {
 487         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 488                 return;
 489
 490         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 491                                                    rt2x00lib_beacondone_iter,
 492                                                    rt2x00dev);
 493
 494         schedule_work(&rt2x00dev->intf_work);
 495 }
 496 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 497
 498 void rt2x00lib_txdone(struct queue_entry *entry,
 499                       struct txdone_entry_desc *txdesc)
 500 {
 501         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 502         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 503         enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
 504
 505         /*
 506          * Unmap the skb.
 507          */
 508         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 509
 510         /*
 511          * If the IV/EIV data was stripped from the frame before it was
 512          * passed to the hardware, we should now reinsert it again because
 513          * mac80211 will expect the the same data to be present it the
 514          * frame as it was passed to us.
 515          */
 516         if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
 517                 rt2x00crypto_tx_insert_iv(entry->skb);
 518
 519         /*
 520          * Send frame to debugfs immediately, after this call is completed
 521          * we are going to overwrite the skb->cb array.
 522          */
 523         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 524
 525         /*
 526          * Update TX statistics.
 527          */
 528         rt2x00dev->link.qual.tx_success +=
 529             test_bit(TXDONE_SUCCESS, &txdesc->flags);
 530         rt2x00dev->link.qual.tx_failed +=
 531             test_bit(TXDONE_FAILURE, &txdesc->flags);
 532
 533         /*
 534          * Initialize TX status
 535          */
 536         memset(&tx_info->status, 0, sizeof(tx_info->status));
 537         tx_info->status.ack_signal = 0;
 538         tx_info->status.excessive_retries =
 539             test_bit(TXDONE_EXCESSIVE_RETRY, &txdesc->flags);
 540         tx_info->status.retry_count = txdesc->retry;
 541
 542         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 543                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 544                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 545                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 546                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 547         }
 548
 549         if (tx_info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) {
 550                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 551                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 552                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 553                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 554         }
 555
 556         /*
 557          * Only send the status report to mac80211 when TX status was
 558          * requested by it. If this was a extra frame coming through
 559          * a mac80211 library call (RTS/CTS) then we should not send the
 560          * status report back.
 561          */
 562         if (tx_info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)
 563                 ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb);
 564         else
 565                 dev_kfree_skb_irq(entry->skb);
 566
 567         /*
 568          * Make this entry available for reuse.
 569          */
 570         entry->skb = NULL;
 571         entry->flags = 0;
 572
 573         rt2x00dev->ops->lib->init_txentry(rt2x00dev, entry);
 574
 575         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 576         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 577
 578         /*
 579          * If the data queue was below the threshold before the txdone
 580          * handler we must make sure the packet queue in the mac80211 stack
 581          * is reenabled when the txdone handler has finished.
 582          */
 583         if (!rt2x00queue_threshold(entry->queue))
 584                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 585 }
 586 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 587
 588 void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
 589                       struct queue_entry *entry)
 590 {
 591         struct rxdone_entry_desc rxdesc;
 592         struct sk_buff *skb;
 593         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 594         struct ieee80211_supported_band *sband;
 595         struct ieee80211_hdr *hdr;
 596         const struct rt2x00_rate *rate;
 597         unsigned int header_length;
 598         unsigned int align;
 599         unsigned int i;
 600         int idx = -1;
 601
 602         /*
 603          * Allocate a new sk_buffer. If no new buffer available, drop the
 604          * received frame and reuse the existing buffer.
 605          */
 606         skb = rt2x00queue_alloc_rxskb(rt2x00dev, entry);
 607         if (!skb)
 608                 return;
 609
 610         /*
 611          * Unmap the skb.
 612          */
 613         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 614
 615         /*
 616          * Extract the RXD details.
 617          */
 618         memset(&rxdesc, 0, sizeof(rxdesc));
 619         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 620
 621         /*
 622          * The data behind the ieee80211 header must be
 623          * aligned on a 4 byte boundary.
 624          */
 625         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 626         align = ((unsigned long)(entry->skb->data + header_length)) & 3;
 627
 628         /*
 629          * Hardware might have stripped the IV/EIV/ICV data,
 630          * in that case it is possible that the data was
 631          * provided seperately (through hardware descriptor)
 632          * in which case we should reinsert the data into the frame.
 633          */
 634         if ((rxdesc.flags & RX_FLAG_IV_STRIPPED)) {
 635                 rt2x00crypto_rx_insert_iv(entry->skb, align,
 636                                           header_length, &rxdesc);
 637         } else if (align) {
 638                 skb_push(entry->skb, align);
 639                 /* Move entire frame in 1 command */
 640                 memmove(entry->skb->data, entry->skb->data + align,
 641                         rxdesc.size);
 642         }
 643
 644         /* Update data pointers, trim buffer to correct size */
 645         skb_trim(entry->skb, rxdesc.size);
 646
 647         /*
 648          * Update RX statistics.
 649          */
 650         sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 651         for (i = 0; i < sband->n_bitrates; i++) {
 652                 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 653
 654                 if (((rxdesc.dev_flags & RXDONE_SIGNAL_PLCP) &&
 655                      (rate->plcp == rxdesc.signal)) ||
 656                     ((rxdesc.dev_flags & RXDONE_SIGNAL_BITRATE) &&
 657                       (rate->bitrate == rxdesc.signal))) {
 658                         idx = i;
 659                         break;
 660                 }
 661         }
 662
 663         if (idx < 0) {
 664                 WARNING(rt2x00dev, "Frame received with unrecognized signal,"
 665                         "signal=0x%.2x, plcp=%d.\n", rxdesc.signal,
 666                         !!(rxdesc.dev_flags & RXDONE_SIGNAL_PLCP));
 667                 idx = 0;
 668         }
 669
 670         /*
 671          * Only update link status if this is a beacon frame carrying our bssid.
 672          */
 673         hdr = (struct ieee80211_hdr *)entry->skb->data;
 674         if (ieee80211_is_beacon(hdr->frame_control) &&
 675             (rxdesc.dev_flags & RXDONE_MY_BSS))
 676                 rt2x00lib_update_link_stats(&rt2x00dev->link, rxdesc.rssi);
 677
 678         rt2x00debug_update_crypto(rt2x00dev,
 679                                   rxdesc.cipher,
 680                                   rxdesc.cipher_status);
 681
 682         rt2x00dev->link.qual.rx_success++;
 683
 684         rx_status->mactime = rxdesc.timestamp;
 685         rx_status->rate_idx = idx;
 686         rx_status->qual =
 687             rt2x00lib_calculate_link_signal(rt2x00dev, rxdesc.rssi);
 688         rx_status->signal = rxdesc.rssi;
 689         rx_status->flag = rxdesc.flags;
 690         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 691
 692         /*
 693          * Send frame to mac80211 & debugfs.
 694          * mac80211 will clean up the skb structure.
 695          */
 696         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 697         ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb, rx_status);
 698
 699         /*
 700          * Replace the skb with the freshly allocated one.
 701          */
 702         entry->skb = skb;
 703         entry->flags = 0;
 704
 705         rt2x00dev->ops->lib->init_rxentry(rt2x00dev, entry);
 706
 707         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 708 }
 709 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 710
 711 /*
 712  * Driver initialization handlers.
 713  */
 714 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 715         {
 716                 .flags = DEV_RATE_CCK | DEV_RATE_BASIC,
 717                 .bitrate = 10,
 718                 .ratemask = BIT(0),
 719                 .plcp = 0x00,
 720         },
 721         {
 722                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 723                 .bitrate = 20,
 724                 .ratemask = BIT(1),
 725                 .plcp = 0x01,
 726         },
 727         {
 728                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 729                 .bitrate = 55,
 730                 .ratemask = BIT(2),
 731                 .plcp = 0x02,
 732         },
 733         {
 734                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 735                 .bitrate = 110,
 736                 .ratemask = BIT(3),
 737                 .plcp = 0x03,
 738         },
 739         {
 740                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 741                 .bitrate = 60,
 742                 .ratemask = BIT(4),
 743                 .plcp = 0x0b,
 744         },
 745         {
 746                 .flags = DEV_RATE_OFDM,
 747                 .bitrate = 90,
 748                 .ratemask = BIT(5),
 749                 .plcp = 0x0f,
 750         },
 751         {
 752                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 753                 .bitrate = 120,
 754                 .ratemask = BIT(6),
 755                 .plcp = 0x0a,
 756         },
 757         {
 758                 .flags = DEV_RATE_OFDM,
 759                 .bitrate = 180,
 760                 .ratemask = BIT(7),
 761                 .plcp = 0x0e,
 762         },
 763         {
 764                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 765                 .bitrate = 240,
 766                 .ratemask = BIT(8),
 767                 .plcp = 0x09,
 768         },
 769         {
 770                 .flags = DEV_RATE_OFDM,
 771                 .bitrate = 360,
 772                 .ratemask = BIT(9),
 773                 .plcp = 0x0d,
 774         },
 775         {
 776                 .flags = DEV_RATE_OFDM,
 777                 .bitrate = 480,
 778                 .ratemask = BIT(10),
 779                 .plcp = 0x08,
 780         },
 781         {
 782                 .flags = DEV_RATE_OFDM,
 783                 .bitrate = 540,
 784                 .ratemask = BIT(11),
 785                 .plcp = 0x0c,
 786         },
 787 };
 788
 789 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 790                               const int channel, const int tx_power,
 791                               const int value)
 792 {
 793         entry->center_freq = ieee80211_channel_to_frequency(channel);
 794         entry->hw_value = value;
 795         entry->max_power = tx_power;
 796         entry->max_antenna_gain = 0xff;
 797 }
 798
 799 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 800                            const u16 index, const struct rt2x00_rate *rate)
 801 {
 802         entry->flags = 0;
 803         entry->bitrate = rate->bitrate;
 804         entry->hw_value = rt2x00_create_rate_hw_value(index, 0);
 805         entry->hw_value_short = entry->hw_value;
 806
 807         if (rate->flags & DEV_RATE_SHORT_PREAMBLE) {
 808                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 809                 entry->hw_value_short |= rt2x00_create_rate_hw_value(index, 1);
 810         }
 811 }
 812
 813 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 814                                     struct hw_mode_spec *spec)
 815 {
 816         struct ieee80211_hw *hw = rt2x00dev->hw;
 817         struct ieee80211_channel *channels;
 818         struct ieee80211_rate *rates;
 819         unsigned int num_rates;
 820         unsigned int i;
 821
 822         num_rates = 0;
 823         if (spec->supported_rates & SUPPORT_RATE_CCK)
 824                 num_rates += 4;
 825         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 826                 num_rates += 8;
 827
 828         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 829         if (!channels)
 830                 return -ENOMEM;
 831
 832         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 833         if (!rates)
 834                 goto exit_free_channels;
 835
 836         /*
 837          * Initialize Rate list.
 838          */
 839         for (i = 0; i < num_rates; i++)
 840                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 841
 842         /*
 843          * Initialize Channel list.
 844          */
 845         for (i = 0; i < spec->num_channels; i++) {
 846                 rt2x00lib_channel(&channels[i],
 847                                   spec->channels[i].channel,
 848                                   spec->channels_info[i].tx_power1, i);
 849         }
 850
 851         /*
 852          * Intitialize 802.11b, 802.11g
 853          * Rates: CCK, OFDM.
 854          * Channels: 2.4 GHz
 855          */
 856         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 857                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 858                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 859                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 860                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 861                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 862                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 863         }
 864
 865         /*
 866          * Intitialize 802.11a
 867          * Rates: OFDM.
 868          * Channels: OFDM, UNII, HiperLAN2.
 869          */
 870         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 871                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 872                     spec->num_channels - 14;
 873                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 874                     num_rates - 4;
 875                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 876                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 877                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 878                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 879         }
 880
 881         return 0;
 882
 883  exit_free_channels:
 884         kfree(channels);
 885         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 886         return -ENOMEM;
 887 }
 888
 889 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 890 {
 891         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 892                 ieee80211_unregister_hw(rt2x00dev->hw);
 893
 894         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 895                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 896                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 897                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 898                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 899         }
 900
 901         kfree(rt2x00dev->spec.channels_info);
 902 }
 903
 904 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 905 {
 906         struct hw_mode_spec *spec = &rt2x00dev->spec;
 907         int status;
 908
 909         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 910                 return 0;
 911
 912         /*
 913          * Initialize HW modes.
 914          */
 915         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 916         if (status)
 917                 return status;
 918
 919         /*
 920          * Initialize HW fields.
 921          */
 922         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 923
 924         /*
 925          * Register HW.
 926          */
 927         status = ieee80211_register_hw(rt2x00dev->hw);
 928         if (status) {
 929                 rt2x00lib_remove_hw(rt2x00dev);
 930                 return status;
 931         }
 932
 933         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 934
 935         return 0;
 936 }
 937
 938 /*
 939  * Initialization/uninitialization handlers.
 940  */
 941 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 942 {
 943         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 944                 return;
 945
 946         /*
 947          * Unregister extra components.
 948          */
 949         rt2x00rfkill_unregister(rt2x00dev);
 950
 951         /*
 952          * Allow the HW to uninitialize.
 953          */
 954         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 955
 956         /*
 957          * Free allocated queue entries.
 958          */
 959         rt2x00queue_uninitialize(rt2x00dev);
 960 }
 961
 962 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 963 {
 964         int status;
 965
 966         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 967                 return 0;
 968
 969         /*
 970          * Allocate all queue entries.
 971          */
 972         status = rt2x00queue_initialize(rt2x00dev);
 973         if (status)
 974                 return status;
 975
 976         /*
 977          * Initialize the device.
 978          */
 979         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 980         if (status) {
 981                 rt2x00queue_uninitialize(rt2x00dev);
 982                 return status;
 983         }
 984
 985         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
 986
 987         /*
 988          * Register the extra components.
 989          */
 990         rt2x00rfkill_register(rt2x00dev);
 991
 992         return 0;
 993 }
 994
 995 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 996 {
 997         int retval;
 998
 999         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1000                 return 0;
1001
1002         /*
1003          * If this is the first interface which is added,
1004          * we should load the firmware now.
1005          */
1006         retval = rt2x00lib_load_firmware(rt2x00dev);
1007         if (retval)
1008                 return retval;
1009
1010         /*
1011          * Initialize the device.
1012          */
1013         retval = rt2x00lib_initialize(rt2x00dev);
1014         if (retval)
1015                 return retval;
1016
1017         rt2x00dev->intf_ap_count = 0;
1018         rt2x00dev->intf_sta_count = 0;
1019         rt2x00dev->intf_associated = 0;
1020
1021         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
1022
1023         return 0;
1024 }
1025
1026 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1027 {
1028         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1029                 return;
1030
1031         /*
1032          * Perhaps we can add something smarter here,
1033          * but for now just disabling the radio should do.
1034          */
1035         rt2x00lib_disable_radio(rt2x00dev);
1036
1037         rt2x00dev->intf_ap_count = 0;
1038         rt2x00dev->intf_sta_count = 0;
1039         rt2x00dev->intf_associated = 0;
1040 }
1041
1042 /*
1043  * driver allocation handlers.
1044  */
1045 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1046 {
1047         int retval = -ENOMEM;
1048
1049         /*
1050          * Make room for rt2x00_intf inside the per-interface
1051          * structure ieee80211_vif.
1052          */
1053         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1054
1055         rt2x00dev->hw->wiphy->interface_modes =
1056             BIT(NL80211_IFTYPE_AP) |
1057             BIT(NL80211_IFTYPE_STATION) |
1058             BIT(NL80211_IFTYPE_ADHOC);
1059
1060         /*
1061          * Let the driver probe the device to detect the capabilities.
1062          */
1063         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1064         if (retval) {
1065                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1066                 goto exit;
1067         }
1068
1069         /*
1070          * Initialize configuration work.
1071          */
1072         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1073         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
1074         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
1075
1076         /*
1077          * Allocate queue array.
1078          */
1079         retval = rt2x00queue_allocate(rt2x00dev);
1080         if (retval)
1081                 goto exit;
1082
1083         /*
1084          * Initialize ieee80211 structure.
1085          */
1086         retval = rt2x00lib_probe_hw(rt2x00dev);
1087         if (retval) {
1088                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1089                 goto exit;
1090         }
1091
1092         /*
1093          * Register extra components.
1094          */
1095         rt2x00leds_register(rt2x00dev);
1096         rt2x00rfkill_allocate(rt2x00dev);
1097         rt2x00debug_register(rt2x00dev);
1098
1099         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1100
1101         return 0;
1102
1103 exit:
1104         rt2x00lib_remove_dev(rt2x00dev);
1105
1106         return retval;
1107 }
1108 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1109
1110 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1111 {
1112         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1113
1114         /*
1115          * Disable radio.
1116          */
1117         rt2x00lib_disable_radio(rt2x00dev);
1118
1119         /*
1120          * Uninitialize device.
1121          */
1122         rt2x00lib_uninitialize(rt2x00dev);
1123
1124         /*
1125          * Free extra components
1126          */
1127         rt2x00debug_deregister(rt2x00dev);
1128         rt2x00rfkill_free(rt2x00dev);
1129         rt2x00leds_unregister(rt2x00dev);
1130
1131         /*
1132          * Free ieee80211_hw memory.
1133          */
1134         rt2x00lib_remove_hw(rt2x00dev);
1135
1136         /*
1137          * Free firmware image.
1138          */
1139         rt2x00lib_free_firmware(rt2x00dev);
1140
1141         /*
1142          * Free queue structures.
1143          */
1144         rt2x00queue_free(rt2x00dev);
1145 }
1146 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1147
1148 /*
1149  * Device state handlers
1150  */
1151 #ifdef CONFIG_PM
1152 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1153 {
1154         int retval;
1155
1156         NOTICE(rt2x00dev, "Going to sleep.\n");
1157
1158         /*
1159          * Only continue if mac80211 has open interfaces.
1160          */
1161         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
1162             !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1163                 goto exit;
1164
1165         set_bit(DEVICE_STATE_STARTED_SUSPEND, &rt2x00dev->flags);
1166
1167         /*
1168          * Disable radio.
1169          */
1170         rt2x00lib_stop(rt2x00dev);
1171         rt2x00lib_uninitialize(rt2x00dev);
1172
1173         /*
1174          * Suspend/disable extra components.
1175          */
1176         rt2x00leds_suspend(rt2x00dev);
1177         rt2x00debug_deregister(rt2x00dev);
1178
1179 exit:
1180         /*
1181          * Set device mode to sleep for power management,
1182          * on some hardware this call seems to consistently fail.
1183          * From the specifications it is hard to tell why it fails,
1184          * and if this is a "bad thing".
1185          * Overall it is safe to just ignore the failure and
1186          * continue suspending. The only downside is that the
1187          * device will not be in optimal power save mode, but with
1188          * the radio and the other components already disabled the
1189          * device is as good as disabled.
1190          */
1191         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1192         if (retval)
1193                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1194                         "continue suspending.\n");
1195
1196         return 0;
1197 }
1198 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1199
1200 static void rt2x00lib_resume_intf(void *data, u8 *mac,
1201                                   struct ieee80211_vif *vif)
1202 {
1203         struct rt2x00_dev *rt2x00dev = data;
1204         struct rt2x00_intf *intf = vif_to_intf(vif);
1205
1206         spin_lock(&intf->lock);
1207
1208         rt2x00lib_config_intf(rt2x00dev, intf,
1209                               vif->type, intf->mac, intf->bssid);
1210
1211
1212         /*
1213          * Master or Ad-hoc mode require a new beacon update.
1214          */
1215         if (vif->type == IEEE80211_IF_TYPE_AP ||
1216             vif->type == IEEE80211_IF_TYPE_IBSS)
1217                 intf->delayed_flags |= DELAYED_UPDATE_BEACON;
1218
1219         spin_unlock(&intf->lock);
1220 }
1221
1222 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1223 {
1224         int retval;
1225
1226         NOTICE(rt2x00dev, "Waking up.\n");
1227
1228         /*
1229          * Restore/enable extra components.
1230          */
1231         rt2x00debug_register(rt2x00dev);
1232         rt2x00leds_resume(rt2x00dev);
1233
1234         /*
1235          * Only continue if mac80211 had open interfaces.
1236          */
1237         if (!test_and_clear_bit(DEVICE_STATE_STARTED_SUSPEND, &rt2x00dev->flags))
1238                 return 0;
1239
1240         /*
1241          * Reinitialize device and all active interfaces.
1242          */
1243         retval = rt2x00lib_start(rt2x00dev);
1244         if (retval)
1245                 goto exit;
1246
1247         /*
1248          * Reconfigure device.
1249          */
1250         retval = rt2x00mac_config(rt2x00dev->hw, &rt2x00dev->hw->conf);
1251         if (retval)
1252                 goto exit;
1253
1254         /*
1255          * Iterator over each active interface to
1256          * reconfigure the hardware.
1257          */
1258         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
1259                                             rt2x00lib_resume_intf, rt2x00dev);
1260
1261         /*
1262          * We are ready again to receive requests from mac80211.
1263          */
1264         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1265
1266         /*
1267          * It is possible that during that mac80211 has attempted
1268          * to send frames while we were suspending or resuming.
1269          * In that case we have disabled the TX queue and should
1270          * now enable it again
1271          */
1272         ieee80211_wake_queues(rt2x00dev->hw);
1273
1274         /*
1275          * During interface iteration we might have changed the
1276          * delayed_flags, time to handles the event by calling
1277          * the work handler directly.
1278          */
1279         rt2x00lib_intf_scheduled(&rt2x00dev->intf_work);
1280
1281         return 0;
1282
1283 exit:
1284         rt2x00lib_stop(rt2x00dev);
1285         rt2x00lib_uninitialize(rt2x00dev);
1286         rt2x00debug_deregister(rt2x00dev);
1287
1288         return retval;
1289 }
1290 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1291 #endif /* CONFIG_PM */
1292
1293 /*
1294  * rt2x00lib module information.
1295  */
1296 MODULE_AUTHOR(DRV_PROJECT);
1297 MODULE_VERSION(DRV_VERSION);
1298 MODULE_DESCRIPTION("rt2x00 library");
1299 MODULE_LICENSE("GPL");