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_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_ENABLED_RADIO, &rt2x00dev->flags) ||
  98             test_bit(DEVICE_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_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_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_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_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_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          * Send frame to debugfs immediately, after this call is completed
 512          * we are going to overwrite the skb->cb array.
 513          */
 514         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 515
 516         /*
 517          * Update TX statistics.
 518          */
 519         rt2x00dev->link.qual.tx_success +=
 520             test_bit(TXDONE_SUCCESS, &txdesc->flags);
 521         rt2x00dev->link.qual.tx_failed +=
 522             test_bit(TXDONE_FAILURE, &txdesc->flags);
 523
 524         /*
 525          * Initialize TX status
 526          */
 527         memset(&tx_info->status, 0, sizeof(tx_info->status));
 528         tx_info->status.ack_signal = 0;
 529         tx_info->status.excessive_retries =
 530             test_bit(TXDONE_EXCESSIVE_RETRY, &txdesc->flags);
 531         tx_info->status.retry_count = txdesc->retry;
 532
 533         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 534                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 535                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 536                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 537                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 538         }
 539
 540         if (tx_info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) {
 541                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 542                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 543                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 544                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 545         }
 546
 547         /*
 548          * Only send the status report to mac80211 when TX status was
 549          * requested by it. If this was a extra frame coming through
 550          * a mac80211 library call (RTS/CTS) then we should not send the
 551          * status report back.
 552          */
 553         if (tx_info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)
 554                 ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb);
 555         else
 556                 dev_kfree_skb_irq(entry->skb);
 557
 558         /*
 559          * Make this entry available for reuse.
 560          */
 561         entry->skb = NULL;
 562         entry->flags = 0;
 563
 564         rt2x00dev->ops->lib->init_txentry(rt2x00dev, entry);
 565
 566         __clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 567         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 568
 569         /*
 570          * If the data queue was below the threshold before the txdone
 571          * handler we must make sure the packet queue in the mac80211 stack
 572          * is reenabled when the txdone handler has finished.
 573          */
 574         if (!rt2x00queue_threshold(entry->queue))
 575                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 576 }
 577 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 578
 579 void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
 580                       struct queue_entry *entry)
 581 {
 582         struct rxdone_entry_desc rxdesc;
 583         struct sk_buff *skb;
 584         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 585         struct ieee80211_supported_band *sband;
 586         struct ieee80211_hdr *hdr;
 587         const struct rt2x00_rate *rate;
 588         unsigned int header_size;
 589         unsigned int align;
 590         unsigned int i;
 591         int idx = -1;
 592
 593         /*
 594          * Allocate a new sk_buffer. If no new buffer available, drop the
 595          * received frame and reuse the existing buffer.
 596          */
 597         skb = rt2x00queue_alloc_rxskb(rt2x00dev, entry);
 598         if (!skb)
 599                 return;
 600
 601         /*
 602          * Unmap the skb.
 603          */
 604         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 605
 606         /*
 607          * Extract the RXD details.
 608          */
 609         memset(&rxdesc, 0, sizeof(rxdesc));
 610         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 611
 612         /*
 613          * The data behind the ieee80211 header must be
 614          * aligned on a 4 byte boundary.
 615          */
 616         header_size = ieee80211_get_hdrlen_from_skb(entry->skb);
 617         align = ((unsigned long)(entry->skb->data + header_size)) & 3;
 618
 619         if (align) {
 620                 skb_push(entry->skb, align);
 621                 /* Move entire frame in 1 command */
 622                 memmove(entry->skb->data, entry->skb->data + align,
 623                         rxdesc.size);
 624         }
 625
 626         /* Update data pointers, trim buffer to correct size */
 627         skb_trim(entry->skb, rxdesc.size);
 628
 629         /*
 630          * Update RX statistics.
 631          */
 632         sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 633         for (i = 0; i < sband->n_bitrates; i++) {
 634                 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 635
 636                 if (((rxdesc.dev_flags & RXDONE_SIGNAL_PLCP) &&
 637                      (rate->plcp == rxdesc.signal)) ||
 638                     (!(rxdesc.dev_flags & RXDONE_SIGNAL_PLCP) &&
 639                       (rate->bitrate == rxdesc.signal))) {
 640                         idx = i;
 641                         break;
 642                 }
 643         }
 644
 645         if (idx < 0) {
 646                 WARNING(rt2x00dev, "Frame received with unrecognized signal,"
 647                         "signal=0x%.2x, plcp=%d.\n", rxdesc.signal,
 648                         !!(rxdesc.dev_flags & RXDONE_SIGNAL_PLCP));
 649                 idx = 0;
 650         }
 651
 652         /*
 653          * Only update link status if this is a beacon frame carrying our bssid.
 654          */
 655         hdr = (struct ieee80211_hdr *)entry->skb->data;
 656         if (ieee80211_is_beacon(hdr->frame_control) &&
 657             (rxdesc.dev_flags & RXDONE_MY_BSS))
 658                 rt2x00lib_update_link_stats(&rt2x00dev->link, rxdesc.rssi);
 659
 660         rt2x00dev->link.qual.rx_success++;
 661
 662         rx_status->mactime = rxdesc.timestamp;
 663         rx_status->rate_idx = idx;
 664         rx_status->qual =
 665             rt2x00lib_calculate_link_signal(rt2x00dev, rxdesc.rssi);
 666         rx_status->signal = rxdesc.rssi;
 667         rx_status->flag = rxdesc.flags;
 668         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 669
 670         /*
 671          * Send frame to mac80211 & debugfs.
 672          * mac80211 will clean up the skb structure.
 673          */
 674         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 675         ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb, rx_status);
 676
 677         /*
 678          * Replace the skb with the freshly allocated one.
 679          */
 680         entry->skb = skb;
 681         entry->flags = 0;
 682
 683         rt2x00dev->ops->lib->init_rxentry(rt2x00dev, entry);
 684
 685         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 686 }
 687 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 688
 689 /*
 690  * Driver initialization handlers.
 691  */
 692 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 693         {
 694                 .flags = DEV_RATE_CCK | DEV_RATE_BASIC,
 695                 .bitrate = 10,
 696                 .ratemask = BIT(0),
 697                 .plcp = 0x00,
 698         },
 699         {
 700                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 701                 .bitrate = 20,
 702                 .ratemask = BIT(1),
 703                 .plcp = 0x01,
 704         },
 705         {
 706                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 707                 .bitrate = 55,
 708                 .ratemask = BIT(2),
 709                 .plcp = 0x02,
 710         },
 711         {
 712                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 713                 .bitrate = 110,
 714                 .ratemask = BIT(3),
 715                 .plcp = 0x03,
 716         },
 717         {
 718                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 719                 .bitrate = 60,
 720                 .ratemask = BIT(4),
 721                 .plcp = 0x0b,
 722         },
 723         {
 724                 .flags = DEV_RATE_OFDM,
 725                 .bitrate = 90,
 726                 .ratemask = BIT(5),
 727                 .plcp = 0x0f,
 728         },
 729         {
 730                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 731                 .bitrate = 120,
 732                 .ratemask = BIT(6),
 733                 .plcp = 0x0a,
 734         },
 735         {
 736                 .flags = DEV_RATE_OFDM,
 737                 .bitrate = 180,
 738                 .ratemask = BIT(7),
 739                 .plcp = 0x0e,
 740         },
 741         {
 742                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 743                 .bitrate = 240,
 744                 .ratemask = BIT(8),
 745                 .plcp = 0x09,
 746         },
 747         {
 748                 .flags = DEV_RATE_OFDM,
 749                 .bitrate = 360,
 750                 .ratemask = BIT(9),
 751                 .plcp = 0x0d,
 752         },
 753         {
 754                 .flags = DEV_RATE_OFDM,
 755                 .bitrate = 480,
 756                 .ratemask = BIT(10),
 757                 .plcp = 0x08,
 758         },
 759         {
 760                 .flags = DEV_RATE_OFDM,
 761                 .bitrate = 540,
 762                 .ratemask = BIT(11),
 763                 .plcp = 0x0c,
 764         },
 765 };
 766
 767 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 768                               const int channel, const int tx_power,
 769                               const int value)
 770 {
 771         entry->center_freq = ieee80211_channel_to_frequency(channel);
 772         entry->hw_value = value;
 773         entry->max_power = tx_power;
 774         entry->max_antenna_gain = 0xff;
 775 }
 776
 777 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 778                            const u16 index, const struct rt2x00_rate *rate)
 779 {
 780         entry->flags = 0;
 781         entry->bitrate = rate->bitrate;
 782         entry->hw_value = rt2x00_create_rate_hw_value(index, 0);
 783         entry->hw_value_short = entry->hw_value;
 784
 785         if (rate->flags & DEV_RATE_SHORT_PREAMBLE) {
 786                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 787                 entry->hw_value_short |= rt2x00_create_rate_hw_value(index, 1);
 788         }
 789 }
 790
 791 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 792                                     struct hw_mode_spec *spec)
 793 {
 794         struct ieee80211_hw *hw = rt2x00dev->hw;
 795         struct ieee80211_channel *channels;
 796         struct ieee80211_rate *rates;
 797         unsigned int num_rates;
 798         unsigned int i;
 799         unsigned char tx_power;
 800
 801         num_rates = 0;
 802         if (spec->supported_rates & SUPPORT_RATE_CCK)
 803                 num_rates += 4;
 804         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 805                 num_rates += 8;
 806
 807         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 808         if (!channels)
 809                 return -ENOMEM;
 810
 811         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 812         if (!rates)
 813                 goto exit_free_channels;
 814
 815         /*
 816          * Initialize Rate list.
 817          */
 818         for (i = 0; i < num_rates; i++)
 819                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 820
 821         /*
 822          * Initialize Channel list.
 823          */
 824         for (i = 0; i < spec->num_channels; i++) {
 825                 if (spec->channels[i].channel <= 14) {
 826                         if (spec->tx_power_bg)
 827                                 tx_power = spec->tx_power_bg[i];
 828                         else
 829                                 tx_power = spec->tx_power_default;
 830                 } else {
 831                         if (spec->tx_power_a)
 832                                 tx_power = spec->tx_power_a[i];
 833                         else
 834                                 tx_power = spec->tx_power_default;
 835                 }
 836
 837                 rt2x00lib_channel(&channels[i],
 838                                   spec->channels[i].channel, tx_power, i);
 839         }
 840
 841         /*
 842          * Intitialize 802.11b, 802.11g
 843          * Rates: CCK, OFDM.
 844          * Channels: 2.4 GHz
 845          */
 846         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 847                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 848                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 849                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 850                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 851                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 852                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 853         }
 854
 855         /*
 856          * Intitialize 802.11a
 857          * Rates: OFDM.
 858          * Channels: OFDM, UNII, HiperLAN2.
 859          */
 860         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 861                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 862                     spec->num_channels - 14;
 863                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 864                     num_rates - 4;
 865                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 866                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 867                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 868                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 869         }
 870
 871         return 0;
 872
 873  exit_free_channels:
 874         kfree(channels);
 875         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 876         return -ENOMEM;
 877 }
 878
 879 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 880 {
 881         if (test_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags))
 882                 ieee80211_unregister_hw(rt2x00dev->hw);
 883
 884         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 885                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 886                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 887                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 888                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 889         }
 890 }
 891
 892 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 893 {
 894         struct hw_mode_spec *spec = &rt2x00dev->spec;
 895         int status;
 896
 897         /*
 898          * Initialize HW modes.
 899          */
 900         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 901         if (status)
 902                 return status;
 903
 904         /*
 905          * Initialize HW fields.
 906          */
 907         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 908
 909         /*
 910          * Register HW.
 911          */
 912         status = ieee80211_register_hw(rt2x00dev->hw);
 913         if (status) {
 914                 rt2x00lib_remove_hw(rt2x00dev);
 915                 return status;
 916         }
 917
 918         __set_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags);
 919
 920         return 0;
 921 }
 922
 923 /*
 924  * Initialization/uninitialization handlers.
 925  */
 926 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 927 {
 928         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 929                 return;
 930
 931         /*
 932          * Unregister extra components.
 933          */
 934         rt2x00rfkill_unregister(rt2x00dev);
 935
 936         /*
 937          * Allow the HW to uninitialize.
 938          */
 939         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 940
 941         /*
 942          * Free allocated queue entries.
 943          */
 944         rt2x00queue_uninitialize(rt2x00dev);
 945 }
 946
 947 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 948 {
 949         int status;
 950
 951         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 952                 return 0;
 953
 954         /*
 955          * Allocate all queue entries.
 956          */
 957         status = rt2x00queue_initialize(rt2x00dev);
 958         if (status)
 959                 return status;
 960
 961         /*
 962          * Initialize the device.
 963          */
 964         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 965         if (status) {
 966                 rt2x00queue_uninitialize(rt2x00dev);
 967                 return status;
 968         }
 969
 970         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
 971
 972         /*
 973          * Register the extra components.
 974          */
 975         rt2x00rfkill_register(rt2x00dev);
 976
 977         return 0;
 978 }
 979
 980 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 981 {
 982         int retval;
 983
 984         if (test_bit(DEVICE_STARTED, &rt2x00dev->flags))
 985                 return 0;
 986
 987         /*
 988          * If this is the first interface which is added,
 989          * we should load the firmware now.
 990          */
 991         retval = rt2x00lib_load_firmware(rt2x00dev);
 992         if (retval)
 993                 return retval;
 994
 995         /*
 996          * Initialize the device.
 997          */
 998         retval = rt2x00lib_initialize(rt2x00dev);
 999         if (retval)
1000                 return retval;
1001
1002         /*
1003          * Enable radio.
1004          */
1005         retval = rt2x00lib_enable_radio(rt2x00dev);
1006         if (retval) {
1007                 rt2x00lib_uninitialize(rt2x00dev);
1008                 return retval;
1009         }
1010
1011         rt2x00dev->intf_ap_count = 0;
1012         rt2x00dev->intf_sta_count = 0;
1013         rt2x00dev->intf_associated = 0;
1014
1015         __set_bit(DEVICE_STARTED, &rt2x00dev->flags);
1016         __set_bit(DEVICE_DIRTY_CONFIG, &rt2x00dev->flags);
1017
1018         return 0;
1019 }
1020
1021 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1022 {
1023         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1024                 return;
1025
1026         /*
1027          * Perhaps we can add something smarter here,
1028          * but for now just disabling the radio should do.
1029          */
1030         rt2x00lib_disable_radio(rt2x00dev);
1031
1032         rt2x00dev->intf_ap_count = 0;
1033         rt2x00dev->intf_sta_count = 0;
1034         rt2x00dev->intf_associated = 0;
1035
1036         __clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
1037 }
1038
1039 /*
1040  * driver allocation handlers.
1041  */
1042 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1043 {
1044         int retval = -ENOMEM;
1045
1046         /*
1047          * Make room for rt2x00_intf inside the per-interface
1048          * structure ieee80211_vif.
1049          */
1050         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1051
1052         /*
1053          * Let the driver probe the device to detect the capabilities.
1054          */
1055         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1056         if (retval) {
1057                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1058                 goto exit;
1059         }
1060
1061         /*
1062          * Initialize configuration work.
1063          */
1064         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1065         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
1066         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
1067
1068         /*
1069          * Allocate queue array.
1070          */
1071         retval = rt2x00queue_allocate(rt2x00dev);
1072         if (retval)
1073                 goto exit;
1074
1075         /*
1076          * Initialize ieee80211 structure.
1077          */
1078         retval = rt2x00lib_probe_hw(rt2x00dev);
1079         if (retval) {
1080                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1081                 goto exit;
1082         }
1083
1084         /*
1085          * Register extra components.
1086          */
1087         rt2x00leds_register(rt2x00dev);
1088         rt2x00rfkill_allocate(rt2x00dev);
1089         rt2x00debug_register(rt2x00dev);
1090
1091         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1092
1093         return 0;
1094
1095 exit:
1096         rt2x00lib_remove_dev(rt2x00dev);
1097
1098         return retval;
1099 }
1100 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1101
1102 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1103 {
1104         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1105
1106         /*
1107          * Disable radio.
1108          */
1109         rt2x00lib_disable_radio(rt2x00dev);
1110
1111         /*
1112          * Uninitialize device.
1113          */
1114         rt2x00lib_uninitialize(rt2x00dev);
1115
1116         /*
1117          * Free extra components
1118          */
1119         rt2x00debug_deregister(rt2x00dev);
1120         rt2x00rfkill_free(rt2x00dev);
1121         rt2x00leds_unregister(rt2x00dev);
1122
1123         /*
1124          * Free ieee80211_hw memory.
1125          */
1126         rt2x00lib_remove_hw(rt2x00dev);
1127
1128         /*
1129          * Free firmware image.
1130          */
1131         rt2x00lib_free_firmware(rt2x00dev);
1132
1133         /*
1134          * Free queue structures.
1135          */
1136         rt2x00queue_free(rt2x00dev);
1137 }
1138 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1139
1140 /*
1141  * Device state handlers
1142  */
1143 #ifdef CONFIG_PM
1144 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1145 {
1146         int retval;
1147
1148         NOTICE(rt2x00dev, "Going to sleep.\n");
1149         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1150
1151         /*
1152          * Only continue if mac80211 has open interfaces.
1153          */
1154         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1155                 goto exit;
1156         __set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
1157
1158         /*
1159          * Disable radio.
1160          */
1161         rt2x00lib_stop(rt2x00dev);
1162         rt2x00lib_uninitialize(rt2x00dev);
1163
1164         /*
1165          * Suspend/disable extra components.
1166          */
1167         rt2x00leds_suspend(rt2x00dev);
1168         rt2x00debug_deregister(rt2x00dev);
1169
1170 exit:
1171         /*
1172          * Set device mode to sleep for power management,
1173          * on some hardware this call seems to consistently fail.
1174          * From the specifications it is hard to tell why it fails,
1175          * and if this is a "bad thing".
1176          * Overall it is safe to just ignore the failure and
1177          * continue suspending. The only downside is that the
1178          * device will not be in optimal power save mode, but with
1179          * the radio and the other components already disabled the
1180          * device is as good as disabled.
1181          */
1182         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1183         if (retval)
1184                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1185                         "continue suspending.\n");
1186
1187         return 0;
1188 }
1189 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1190
1191 static void rt2x00lib_resume_intf(void *data, u8 *mac,
1192                                   struct ieee80211_vif *vif)
1193 {
1194         struct rt2x00_dev *rt2x00dev = data;
1195         struct rt2x00_intf *intf = vif_to_intf(vif);
1196
1197         spin_lock(&intf->lock);
1198
1199         rt2x00lib_config_intf(rt2x00dev, intf,
1200                               vif->type, intf->mac, intf->bssid);
1201
1202
1203         /*
1204          * Master or Ad-hoc mode require a new beacon update.
1205          */
1206         if (vif->type == IEEE80211_IF_TYPE_AP ||
1207             vif->type == IEEE80211_IF_TYPE_IBSS)
1208                 intf->delayed_flags |= DELAYED_UPDATE_BEACON;
1209
1210         spin_unlock(&intf->lock);
1211 }
1212
1213 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1214 {
1215         int retval;
1216
1217         NOTICE(rt2x00dev, "Waking up.\n");
1218
1219         /*
1220          * Restore/enable extra components.
1221          */
1222         rt2x00debug_register(rt2x00dev);
1223         rt2x00leds_resume(rt2x00dev);
1224
1225         /*
1226          * Only continue if mac80211 had open interfaces.
1227          */
1228         if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
1229                 return 0;
1230
1231         /*
1232          * Reinitialize device and all active interfaces.
1233          */
1234         retval = rt2x00lib_start(rt2x00dev);
1235         if (retval)
1236                 goto exit;
1237
1238         /*
1239          * Reconfigure device.
1240          */
1241         retval = rt2x00mac_config(rt2x00dev->hw, &rt2x00dev->hw->conf);
1242         if (retval)
1243                 goto exit;
1244
1245         /*
1246          * Iterator over each active interface to
1247          * reconfigure the hardware.
1248          */
1249         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
1250                                             rt2x00lib_resume_intf, rt2x00dev);
1251
1252         /*
1253          * We are ready again to receive requests from mac80211.
1254          */
1255         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1256
1257         /*
1258          * It is possible that during that mac80211 has attempted
1259          * to send frames while we were suspending or resuming.
1260          * In that case we have disabled the TX queue and should
1261          * now enable it again
1262          */
1263         ieee80211_wake_queues(rt2x00dev->hw);
1264
1265         /*
1266          * During interface iteration we might have changed the
1267          * delayed_flags, time to handles the event by calling
1268          * the work handler directly.
1269          */
1270         rt2x00lib_intf_scheduled(&rt2x00dev->intf_work);
1271
1272         return 0;
1273
1274 exit:
1275         rt2x00lib_disable_radio(rt2x00dev);
1276         rt2x00lib_uninitialize(rt2x00dev);
1277         rt2x00debug_deregister(rt2x00dev);
1278
1279         return retval;
1280 }
1281 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1282 #endif /* CONFIG_PM */
1283
1284 /*
1285  * rt2x00lib module information.
1286  */
1287 MODULE_AUTHOR(DRV_PROJECT);
1288 MODULE_VERSION(DRV_VERSION);
1289 MODULE_DESCRIPTION("rt2x00 library");
1290 MODULE_LICENSE("GPL");