git.oblomov.eu Git - linux-2.6/blob - drivers/net/wireless/rt2x00/rt2x00dev.c

   1 /*
   2         Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00lib
  23         Abstract: rt2x00 generic device routines.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28
  29 #include "rt2x00.h"
  30 #include "rt2x00lib.h"
  31
  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         struct antenna_setup ant;
 180         int sample_a =
 181             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_A);
 182         int sample_b =
 183             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_B);
 184
 185         memcpy(&ant, &rt2x00dev->link.ant.active, sizeof(ant));
 186
 187         /*
 188          * We are done sampling. Now we should evaluate the results.
 189          */
 190         rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
 191
 192         /*
 193          * During the last period we have sampled the RSSI
 194          * from both antenna's. It now is time to determine
 195          * which antenna demonstrated the best performance.
 196          * When we are already on the antenna with the best
 197          * performance, then there really is nothing for us
 198          * left to do.
 199          */
 200         if (sample_a == sample_b)
 201                 return;
 202
 203         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 204                 ant.rx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 205
 206         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 207                 ant.tx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 208
 209         rt2x00lib_config_antenna(rt2x00dev, &ant);
 210 }
 211
 212 static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
 213 {
 214         struct antenna_setup ant;
 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         memcpy(&ant, &rt2x00dev->link.ant.active, sizeof(ant));
 219
 220         /*
 221          * Legacy driver indicates that we should swap antenna's
 222          * when the difference in RSSI is greater that 5. This
 223          * also should be done when the RSSI was actually better
 224          * then the previous sample.
 225          * When the difference exceeds the threshold we should
 226          * sample the rssi from the other antenna to make a valid
 227          * comparison between the 2 antennas.
 228          */
 229         if (abs(rssi_curr - rssi_old) < 5)
 230                 return;
 231
 232         rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;
 233
 234         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 235                 ant.rx = (ant.rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 236
 237         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 238                 ant.tx = (ant.tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 239
 240         rt2x00lib_config_antenna(rt2x00dev, &ant);
 241 }
 242
 243 static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
 244 {
 245         /*
 246          * Determine if software diversity is enabled for
 247          * either the TX or RX antenna (or both).
 248          * Always perform this check since within the link
 249          * tuner interval the configuration might have changed.
 250          */
 251         rt2x00dev->link.ant.flags &= ~ANTENNA_RX_DIVERSITY;
 252         rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;
 253
 254         if (rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY)
 255                 rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
 256         if (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, &vif->bss_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 != NL80211_IFTYPE_AP &&
 471             vif->type != NL80211_IFTYPE_ADHOC)
 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         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 504         enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
 505         u8 rate_idx, rate_flags;
 506
 507         /*
 508          * Unmap the skb.
 509          */
 510         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 511
 512         /*
 513          * If the IV/EIV data was stripped from the frame before it was
 514          * passed to the hardware, we should now reinsert it again because
 515          * mac80211 will expect the the same data to be present it the
 516          * frame as it was passed to us.
 517          */
 518         if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
 519                 rt2x00crypto_tx_insert_iv(entry->skb);
 520
 521         /*
 522          * Send frame to debugfs immediately, after this call is completed
 523          * we are going to overwrite the skb->cb array.
 524          */
 525         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 526
 527         /*
 528          * Update TX statistics.
 529          */
 530         rt2x00dev->link.qual.tx_success +=
 531             test_bit(TXDONE_SUCCESS, &txdesc->flags);
 532         rt2x00dev->link.qual.tx_failed +=
 533             test_bit(TXDONE_FAILURE, &txdesc->flags);
 534
 535         rate_idx = skbdesc->tx_rate_idx;
 536         rate_flags = skbdesc->tx_rate_flags;
 537
 538         /*
 539          * Initialize TX status
 540          */
 541         memset(&tx_info->status, 0, sizeof(tx_info->status));
 542         tx_info->status.ack_signal = 0;
 543         tx_info->status.rates[0].idx = rate_idx;
 544         tx_info->status.rates[0].flags = rate_flags;
 545         tx_info->status.rates[0].count = txdesc->retry + 1;
 546         tx_info->status.rates[1].idx = -1; /* terminate */
 547
 548         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 549                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 550                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 551                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 552                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 553         }
 554
 555         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 556                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 557                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 558                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 559                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 560         }
 561
 562         /*
 563          * Only send the status report to mac80211 when TX status was
 564          * requested by it. If this was a extra frame coming through
 565          * a mac80211 library call (RTS/CTS) then we should not send the
 566          * status report back.
 567          */
 568         if (tx_info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)
 569                 ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb);
 570         else
 571                 dev_kfree_skb_irq(entry->skb);
 572
 573         /*
 574          * Make this entry available for reuse.
 575          */
 576         entry->skb = NULL;
 577         entry->flags = 0;
 578
 579         rt2x00dev->ops->lib->init_txentry(rt2x00dev, entry);
 580
 581         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 582         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 583
 584         /*
 585          * If the data queue was below the threshold before the txdone
 586          * handler we must make sure the packet queue in the mac80211 stack
 587          * is reenabled when the txdone handler has finished.
 588          */
 589         if (!rt2x00queue_threshold(entry->queue))
 590                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 591 }
 592 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 593
 594 void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
 595                       struct queue_entry *entry)
 596 {
 597         struct rxdone_entry_desc rxdesc;
 598         struct sk_buff *skb;
 599         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 600         struct ieee80211_supported_band *sband;
 601         struct ieee80211_hdr *hdr;
 602         const struct rt2x00_rate *rate;
 603         unsigned int header_length;
 604         unsigned int align;
 605         unsigned int i;
 606         int idx = -1;
 607
 608         /*
 609          * Allocate a new sk_buffer. If no new buffer available, drop the
 610          * received frame and reuse the existing buffer.
 611          */
 612         skb = rt2x00queue_alloc_rxskb(rt2x00dev, entry);
 613         if (!skb)
 614                 return;
 615
 616         /*
 617          * Unmap the skb.
 618          */
 619         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 620
 621         /*
 622          * Extract the RXD details.
 623          */
 624         memset(&rxdesc, 0, sizeof(rxdesc));
 625         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 626
 627         /*
 628          * The data behind the ieee80211 header must be
 629          * aligned on a 4 byte boundary.
 630          */
 631         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 632         align = ((unsigned long)(entry->skb->data + header_length)) & 3;
 633
 634         /*
 635          * Hardware might have stripped the IV/EIV/ICV data,
 636          * in that case it is possible that the data was
 637          * provided seperately (through hardware descriptor)
 638          * in which case we should reinsert the data into the frame.
 639          */
 640         if ((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->init_rxentry(rt2x00dev, 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 = rt2x00_create_rate_hw_value(index, 0);
 811         entry->hw_value_short = entry->hw_value;
 812
 813         if (rate->flags & DEV_RATE_SHORT_PREAMBLE) {
 814                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 815                 entry->hw_value_short |= rt2x00_create_rate_hw_value(index, 1);
 816         }
 817 }
 818
 819 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 820                                     struct hw_mode_spec *spec)
 821 {
 822         struct ieee80211_hw *hw = rt2x00dev->hw;
 823         struct ieee80211_channel *channels;
 824         struct ieee80211_rate *rates;
 825         unsigned int num_rates;
 826         unsigned int i;
 827
 828         num_rates = 0;
 829         if (spec->supported_rates & SUPPORT_RATE_CCK)
 830                 num_rates += 4;
 831         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 832                 num_rates += 8;
 833
 834         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 835         if (!channels)
 836                 return -ENOMEM;
 837
 838         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 839         if (!rates)
 840                 goto exit_free_channels;
 841
 842         /*
 843          * Initialize Rate list.
 844          */
 845         for (i = 0; i < num_rates; i++)
 846                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 847
 848         /*
 849          * Initialize Channel list.
 850          */
 851         for (i = 0; i < spec->num_channels; i++) {
 852                 rt2x00lib_channel(&channels[i],
 853                                   spec->channels[i].channel,
 854                                   spec->channels_info[i].tx_power1, i);
 855         }
 856
 857         /*
 858          * Intitialize 802.11b, 802.11g
 859          * Rates: CCK, OFDM.
 860          * Channels: 2.4 GHz
 861          */
 862         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 863                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 864                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 865                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 866                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 867                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 868                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 869         }
 870
 871         /*
 872          * Intitialize 802.11a
 873          * Rates: OFDM.
 874          * Channels: OFDM, UNII, HiperLAN2.
 875          */
 876         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 877                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 878                     spec->num_channels - 14;
 879                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 880                     num_rates - 4;
 881                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 882                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 883                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 884                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 885         }
 886
 887         return 0;
 888
 889  exit_free_channels:
 890         kfree(channels);
 891         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 892         return -ENOMEM;
 893 }
 894
 895 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 896 {
 897         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 898                 ieee80211_unregister_hw(rt2x00dev->hw);
 899
 900         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 901                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 902                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 903                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 904                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 905         }
 906
 907         kfree(rt2x00dev->spec.channels_info);
 908 }
 909
 910 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 911 {
 912         struct hw_mode_spec *spec = &rt2x00dev->spec;
 913         int status;
 914
 915         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 916                 return 0;
 917
 918         /*
 919          * Initialize HW modes.
 920          */
 921         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 922         if (status)
 923                 return status;
 924
 925         /*
 926          * Initialize HW fields.
 927          */
 928         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 929
 930         /*
 931          * Register HW.
 932          */
 933         status = ieee80211_register_hw(rt2x00dev->hw);
 934         if (status) {
 935                 rt2x00lib_remove_hw(rt2x00dev);
 936                 return status;
 937         }
 938
 939         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 940
 941         return 0;
 942 }
 943
 944 /*
 945  * Initialization/uninitialization handlers.
 946  */
 947 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 948 {
 949         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 950                 return;
 951
 952         /*
 953          * Unregister extra components.
 954          */
 955         rt2x00rfkill_unregister(rt2x00dev);
 956
 957         /*
 958          * Allow the HW to uninitialize.
 959          */
 960         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 961
 962         /*
 963          * Free allocated queue entries.
 964          */
 965         rt2x00queue_uninitialize(rt2x00dev);
 966 }
 967
 968 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 969 {
 970         int status;
 971
 972         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 973                 return 0;
 974
 975         /*
 976          * Allocate all queue entries.
 977          */
 978         status = rt2x00queue_initialize(rt2x00dev);
 979         if (status)
 980                 return status;
 981
 982         /*
 983          * Initialize the device.
 984          */
 985         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 986         if (status) {
 987                 rt2x00queue_uninitialize(rt2x00dev);
 988                 return status;
 989         }
 990
 991         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
 992
 993         /*
 994          * Register the extra components.
 995          */
 996         rt2x00rfkill_register(rt2x00dev);
 997
 998         return 0;
 999 }
1000
1001 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1002 {
1003         int retval;
1004
1005         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1006                 return 0;
1007
1008         /*
1009          * If this is the first interface which is added,
1010          * we should load the firmware now.
1011          */
1012         retval = rt2x00lib_load_firmware(rt2x00dev);
1013         if (retval)
1014                 return retval;
1015
1016         /*
1017          * Initialize the device.
1018          */
1019         retval = rt2x00lib_initialize(rt2x00dev);
1020         if (retval)
1021                 return retval;
1022
1023         rt2x00dev->intf_ap_count = 0;
1024         rt2x00dev->intf_sta_count = 0;
1025         rt2x00dev->intf_associated = 0;
1026
1027         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
1028
1029         return 0;
1030 }
1031
1032 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1033 {
1034         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1035                 return;
1036
1037         /*
1038          * Perhaps we can add something smarter here,
1039          * but for now just disabling the radio should do.
1040          */
1041         rt2x00lib_disable_radio(rt2x00dev);
1042
1043         rt2x00dev->intf_ap_count = 0;
1044         rt2x00dev->intf_sta_count = 0;
1045         rt2x00dev->intf_associated = 0;
1046 }
1047
1048 /*
1049  * driver allocation handlers.
1050  */
1051 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1052 {
1053         int retval = -ENOMEM;
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");