SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/net/wireless/rt2x00/rt2x00dev.c

   1 /*
   2         Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00lib
  23         Abstract: rt2x00 generic device routines.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28
  29 #include "rt2x00.h"
  30 #include "rt2x00lib.h"
  31 #include "rt2x00dump.h"
  32
  33 /*
  34  * Link tuning handlers
  35  */
  36 void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
  37 {
  38         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
  39                 return;
  40
  41         /*
  42          * Reset link information.
  43          * Both the currently active vgc level as well as
  44          * the link tuner counter should be reset. Resetting
  45          * the counter is important for devices where the
  46          * device should only perform link tuning during the
  47          * first minute after being enabled.
  48          */
  49         rt2x00dev->link.count = 0;
  50         rt2x00dev->link.vgc_level = 0;
  51
  52         /*
  53          * Reset the link tuner.
  54          */
  55         rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
  56 }
  57
  58 static void rt2x00lib_start_link_tuner(struct rt2x00_dev *rt2x00dev)
  59 {
  60         /*
  61          * Clear all (possibly) pre-existing quality statistics.
  62          */
  63         memset(&rt2x00dev->link.qual, 0, sizeof(rt2x00dev->link.qual));
  64
  65         /*
  66          * The RX and TX percentage should start at 50%
  67          * this will assure we will get at least get some
  68          * decent value when the link tuner starts.
  69          * The value will be dropped and overwritten with
  70          * the correct (measured )value anyway during the
  71          * first run of the link tuner.
  72          */
  73         rt2x00dev->link.qual.rx_percentage = 50;
  74         rt2x00dev->link.qual.tx_percentage = 50;
  75
  76         rt2x00lib_reset_link_tuner(rt2x00dev);
  77
  78         queue_delayed_work(rt2x00dev->workqueue,
  79                            &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
  80 }
  81
  82 static void rt2x00lib_stop_link_tuner(struct rt2x00_dev *rt2x00dev)
  83 {
  84         cancel_delayed_work_sync(&rt2x00dev->link.work);
  85 }
  86
  87 /*
  88  * Radio control handlers.
  89  */
  90 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  91 {
  92         int status;
  93
  94         /*
  95          * Don't enable the radio twice.
  96          * And check if the hardware button has been disabled.
  97          */
  98         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
  99             test_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags))
 100                 return 0;
 101
 102         /*
 103          * Initialize all data queues.
 104          */
 105         rt2x00queue_init_rx(rt2x00dev);
 106         rt2x00queue_init_tx(rt2x00dev);
 107
 108         /*
 109          * Enable radio.
 110          */
 111         status =
 112             rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
 113         if (status)
 114                 return status;
 115
 116         rt2x00leds_led_radio(rt2x00dev, true);
 117         rt2x00led_led_activity(rt2x00dev, true);
 118
 119         __set_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags);
 120
 121         /*
 122          * Enable RX.
 123          */
 124         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 125
 126         /*
 127          * Start the TX queues.
 128          */
 129         ieee80211_start_queues(rt2x00dev->hw);
 130
 131         return 0;
 132 }
 133
 134 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
 135 {
 136         if (!__test_and_clear_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 137                 return;
 138
 139         /*
 140          * Stop the TX queues.
 141          */
 142         ieee80211_stop_queues(rt2x00dev->hw);
 143
 144         /*
 145          * Disable RX.
 146          */
 147         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 148
 149         /*
 150          * Disable radio.
 151          */
 152         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 153         rt2x00led_led_activity(rt2x00dev, false);
 154         rt2x00leds_led_radio(rt2x00dev, false);
 155 }
 156
 157 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 158 {
 159         /*
 160          * When we are disabling the RX, we should also stop the link tuner.
 161          */
 162         if (state == STATE_RADIO_RX_OFF)
 163                 rt2x00lib_stop_link_tuner(rt2x00dev);
 164
 165         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 166
 167         /*
 168          * When we are enabling the RX, we should also start the link tuner.
 169          */
 170         if (state == STATE_RADIO_RX_ON &&
 171             (rt2x00dev->intf_ap_count || rt2x00dev->intf_sta_count))
 172                 rt2x00lib_start_link_tuner(rt2x00dev);
 173 }
 174
 175 static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev *rt2x00dev)
 176 {
 177         enum antenna rx = rt2x00dev->link.ant.active.rx;
 178         enum antenna tx = rt2x00dev->link.ant.active.tx;
 179         int sample_a =
 180             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_A);
 181         int sample_b =
 182             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_B);
 183
 184         /*
 185          * We are done sampling. Now we should evaluate the results.
 186          */
 187         rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
 188
 189         /*
 190          * During the last period we have sampled the RSSI
 191          * from both antenna's. It now is time to determine
 192          * which antenna demonstrated the best performance.
 193          * When we are already on the antenna with the best
 194          * performance, then there really is nothing for us
 195          * left to do.
 196          */
 197         if (sample_a == sample_b)
 198                 return;
 199
 200         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 201                 rx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 202
 203         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 204                 tx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 205
 206         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 207 }
 208
 209 static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
 210 {
 211         enum antenna rx = rt2x00dev->link.ant.active.rx;
 212         enum antenna tx = rt2x00dev->link.ant.active.tx;
 213         int rssi_curr = rt2x00_get_link_ant_rssi(&rt2x00dev->link);
 214         int rssi_old = rt2x00_update_ant_rssi(&rt2x00dev->link, rssi_curr);
 215
 216         /*
 217          * Legacy driver indicates that we should swap antenna's
 218          * when the difference in RSSI is greater that 5. This
 219          * also should be done when the RSSI was actually better
 220          * then the previous sample.
 221          * When the difference exceeds the threshold we should
 222          * sample the rssi from the other antenna to make a valid
 223          * comparison between the 2 antennas.
 224          */
 225         if (abs(rssi_curr - rssi_old) < 5)
 226                 return;
 227
 228         rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;
 229
 230         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 231                 rx = (rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 232
 233         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 234                 tx = (tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 235
 236         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 237 }
 238
 239 static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
 240 {
 241         /*
 242          * Determine if software diversity is enabled for
 243          * either the TX or RX antenna (or both).
 244          * Always perform this check since within the link
 245          * tuner interval the configuration might have changed.
 246          */
 247         rt2x00dev->link.ant.flags &= ~ANTENNA_RX_DIVERSITY;
 248         rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;
 249
 250         if (rt2x00dev->hw->conf.antenna_sel_rx == 0 &&
 251             rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY)
 252                 rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
 253         if (rt2x00dev->hw->conf.antenna_sel_tx == 0 &&
 254             rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY)
 255                 rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;
 256
 257         if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&
 258             !(rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)) {
 259                 rt2x00dev->link.ant.flags = 0;
 260                 return;
 261         }
 262
 263         /*
 264          * If we have only sampled the data over the last period
 265          * we should now harvest the data. Otherwise just evaluate
 266          * the data. The latter should only be performed once
 267          * every 2 seconds.
 268          */
 269         if (rt2x00dev->link.ant.flags & ANTENNA_MODE_SAMPLE)
 270                 rt2x00lib_evaluate_antenna_sample(rt2x00dev);
 271         else if (rt2x00dev->link.count & 1)
 272                 rt2x00lib_evaluate_antenna_eval(rt2x00dev);
 273 }
 274
 275 static void rt2x00lib_update_link_stats(struct link *link, int rssi)
 276 {
 277         int avg_rssi = rssi;
 278
 279         /*
 280          * Update global RSSI
 281          */
 282         if (link->qual.avg_rssi)
 283                 avg_rssi = MOVING_AVERAGE(link->qual.avg_rssi, rssi, 8);
 284         link->qual.avg_rssi = avg_rssi;
 285
 286         /*
 287          * Update antenna RSSI
 288          */
 289         if (link->ant.rssi_ant)
 290                 rssi = MOVING_AVERAGE(link->ant.rssi_ant, rssi, 8);
 291         link->ant.rssi_ant = rssi;
 292 }
 293
 294 static void rt2x00lib_precalculate_link_signal(struct link_qual *qual)
 295 {
 296         if (qual->rx_failed || qual->rx_success)
 297                 qual->rx_percentage =
 298                     (qual->rx_success * 100) /
 299                     (qual->rx_failed + qual->rx_success);
 300         else
 301                 qual->rx_percentage = 50;
 302
 303         if (qual->tx_failed || qual->tx_success)
 304                 qual->tx_percentage =
 305                     (qual->tx_success * 100) /
 306                     (qual->tx_failed + qual->tx_success);
 307         else
 308                 qual->tx_percentage = 50;
 309
 310         qual->rx_success = 0;
 311         qual->rx_failed = 0;
 312         qual->tx_success = 0;
 313         qual->tx_failed = 0;
 314 }
 315
 316 static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
 317                                            int rssi)
 318 {
 319         int rssi_percentage = 0;
 320         int signal;
 321
 322         /*
 323          * We need a positive value for the RSSI.
 324          */
 325         if (rssi < 0)
 326                 rssi += rt2x00dev->rssi_offset;
 327
 328         /*
 329          * Calculate the different percentages,
 330          * which will be used for the signal.
 331          */
 332         if (rt2x00dev->rssi_offset)
 333                 rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
 334
 335         /*
 336          * Add the individual percentages and use the WEIGHT
 337          * defines to calculate the current link signal.
 338          */
 339         signal = ((WEIGHT_RSSI * rssi_percentage) +
 340                   (WEIGHT_TX * rt2x00dev->link.qual.tx_percentage) +
 341                   (WEIGHT_RX * rt2x00dev->link.qual.rx_percentage)) / 100;
 342
 343         return (signal > 100) ? 100 : signal;
 344 }
 345
 346 static void rt2x00lib_link_tuner(struct work_struct *work)
 347 {
 348         struct rt2x00_dev *rt2x00dev =
 349             container_of(work, struct rt2x00_dev, link.work.work);
 350
 351         /*
 352          * When the radio is shutting down we should
 353          * immediately cease all link tuning.
 354          */
 355         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 356                 return;
 357
 358         /*
 359          * Update statistics.
 360          */
 361         rt2x00dev->ops->lib->link_stats(rt2x00dev, &rt2x00dev->link.qual);
 362         rt2x00dev->low_level_stats.dot11FCSErrorCount +=
 363             rt2x00dev->link.qual.rx_failed;
 364
 365         /*
 366          * Only perform the link tuning when Link tuning
 367          * has been enabled (This could have been disabled from the EEPROM).
 368          */
 369         if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
 370                 rt2x00dev->ops->lib->link_tuner(rt2x00dev);
 371
 372         /*
 373          * Precalculate a portion of the link signal which is
 374          * in based on the tx/rx success/failure counters.
 375          */
 376         rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
 377
 378         /*
 379          * Send a signal to the led to update the led signal strength.
 380          */
 381         rt2x00leds_led_quality(rt2x00dev, rt2x00dev->link.qual.avg_rssi);
 382
 383         /*
 384          * Evaluate antenna setup, make this the last step since this could
 385          * possibly reset some statistics.
 386          */
 387         rt2x00lib_evaluate_antenna(rt2x00dev);
 388
 389         /*
 390          * Increase tuner counter, and reschedule the next link tuner run.
 391          */
 392         rt2x00dev->link.count++;
 393         queue_delayed_work(rt2x00dev->workqueue,
 394                            &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
 395 }
 396
 397 static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
 398 {
 399         struct rt2x00_dev *rt2x00dev =
 400             container_of(work, struct rt2x00_dev, filter_work);
 401
 402         rt2x00dev->ops->lib->config_filter(rt2x00dev, rt2x00dev->packet_filter);
 403 }
 404
 405 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 406                                           struct ieee80211_vif *vif)
 407 {
 408         struct rt2x00_dev *rt2x00dev = data;
 409         struct rt2x00_intf *intf = vif_to_intf(vif);
 410         struct sk_buff *skb;
 411         struct ieee80211_tx_control control;
 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                 skb = ieee80211_beacon_get(rt2x00dev->hw, vif, &control);
 439                 if (skb && rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw,
 440                                                              skb, &control))
 441                         dev_kfree_skb(skb);
 442         }
 443
 444         if (delayed_flags & DELAYED_CONFIG_ERP)
 445                 rt2x00lib_config_erp(rt2x00dev, intf, &conf);
 446
 447         if (delayed_flags & DELAYED_LED_ASSOC)
 448                 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
 449 }
 450
 451 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 452 {
 453         struct rt2x00_dev *rt2x00dev =
 454             container_of(work, struct rt2x00_dev, intf_work);
 455
 456         /*
 457          * Iterate over each interface and perform the
 458          * requested configurations.
 459          */
 460         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 461                                             rt2x00lib_intf_scheduled_iter,
 462                                             rt2x00dev);
 463 }
 464
 465 /*
 466  * Interrupt context handlers.
 467  */
 468 static void rt2x00lib_beacondone_iter(void *data, u8 *mac,
 469                                       struct ieee80211_vif *vif)
 470 {
 471         struct rt2x00_intf *intf = vif_to_intf(vif);
 472
 473         if (vif->type != IEEE80211_IF_TYPE_AP &&
 474             vif->type != IEEE80211_IF_TYPE_IBSS)
 475                 return;
 476
 477         spin_lock(&intf->lock);
 478         intf->delayed_flags |= DELAYED_UPDATE_BEACON;
 479         spin_unlock(&intf->lock);
 480 }
 481
 482 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 483 {
 484         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 485                 return;
 486
 487         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 488                                                    rt2x00lib_beacondone_iter,
 489                                                    rt2x00dev);
 490
 491         queue_work(rt2x00dev->workqueue, &rt2x00dev->intf_work);
 492 }
 493 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 494
 495 void rt2x00lib_txdone(struct queue_entry *entry,
 496                       struct txdone_entry_desc *txdesc)
 497 {
 498         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 499         struct skb_frame_desc *skbdesc;
 500         struct ieee80211_tx_status tx_status;
 501         int success = !!(txdesc->status == TX_SUCCESS ||
 502                          txdesc->status == TX_SUCCESS_RETRY);
 503         int fail = !!(txdesc->status == TX_FAIL_RETRY ||
 504                       txdesc->status == TX_FAIL_INVALID ||
 505                       txdesc->status == TX_FAIL_OTHER);
 506
 507         /*
 508          * Update TX statistics.
 509          */
 510         rt2x00dev->link.qual.tx_success += success;
 511         rt2x00dev->link.qual.tx_failed += fail;
 512
 513         /*
 514          * Initialize TX status
 515          */
 516         tx_status.flags = 0;
 517         tx_status.ack_signal = 0;
 518         tx_status.excessive_retries = (txdesc->status == TX_FAIL_RETRY);
 519         tx_status.retry_count = txdesc->retry;
 520         memcpy(&tx_status.control, txdesc->control, sizeof(*txdesc->control));
 521
 522         if (!(tx_status.control.flags & IEEE80211_TXCTL_NO_ACK)) {
 523                 if (success)
 524                         tx_status.flags |= IEEE80211_TX_STATUS_ACK;
 525                 else
 526                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 527         }
 528
 529         tx_status.queue_length = entry->queue->limit;
 530         tx_status.queue_number = tx_status.control.queue;
 531
 532         if (tx_status.control.flags & IEEE80211_TXCTL_USE_RTS_CTS) {
 533                 if (success)
 534                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 535                 else
 536                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 537         }
 538
 539         /*
 540          * Send the tx_status to debugfs. Only send the status report
 541          * to mac80211 when the frame originated from there. If this was
 542          * a extra frame coming through a mac80211 library call (RTS/CTS)
 543          * then we should not send the status report back.
 544          * If send to mac80211, mac80211 will clean up the skb structure,
 545          * otherwise we have to do it ourself.
 546          */
 547         skbdesc = get_skb_frame_desc(entry->skb);
 548         skbdesc->frame_type = DUMP_FRAME_TXDONE;
 549
 550         rt2x00debug_dump_frame(rt2x00dev, entry->skb);
 551
 552         if (!(skbdesc->flags & FRAME_DESC_DRIVER_GENERATED))
 553                 ieee80211_tx_status_irqsafe(rt2x00dev->hw,
 554                                             entry->skb, &tx_status);
 555         else
 556                 dev_kfree_skb(entry->skb);
 557         entry->skb = NULL;
 558 }
 559 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 560
 561 void rt2x00lib_rxdone(struct queue_entry *entry,
 562                       struct rxdone_entry_desc *rxdesc)
 563 {
 564         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 565         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 566         struct ieee80211_supported_band *sband;
 567         struct ieee80211_hdr *hdr;
 568         const struct rt2x00_rate *rate;
 569         unsigned int i;
 570         int idx = -1;
 571         u16 fc;
 572
 573         /*
 574          * Update RX statistics.
 575          */
 576         sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 577         for (i = 0; i < sband->n_bitrates; i++) {
 578                 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 579
 580                 if (((rxdesc->dev_flags & RXDONE_SIGNAL_PLCP) &&
 581                      (rate->plcp == rxdesc->signal)) ||
 582                     (!(rxdesc->dev_flags & RXDONE_SIGNAL_PLCP) &&
 583                       (rate->bitrate == rxdesc->signal))) {
 584                         idx = i;
 585                         break;
 586                 }
 587         }
 588
 589         if (idx < 0) {
 590                 WARNING(rt2x00dev, "Frame received with unrecognized signal,"
 591                         "signal=0x%.2x, plcp=%d.\n", rxdesc->signal,
 592                         !!(rxdesc->dev_flags & RXDONE_SIGNAL_PLCP));
 593                 idx = 0;
 594         }
 595
 596         /*
 597          * Only update link status if this is a beacon frame carrying our bssid.
 598          */
 599         hdr = (struct ieee80211_hdr *)entry->skb->data;
 600         fc = le16_to_cpu(hdr->frame_control);
 601         if (is_beacon(fc) && (rxdesc->dev_flags & RXDONE_MY_BSS))
 602                 rt2x00lib_update_link_stats(&rt2x00dev->link, rxdesc->rssi);
 603
 604         rt2x00dev->link.qual.rx_success++;
 605
 606         rx_status->rate_idx = idx;
 607         rx_status->signal =
 608             rt2x00lib_calculate_link_signal(rt2x00dev, rxdesc->rssi);
 609         rx_status->ssi = rxdesc->rssi;
 610         rx_status->flag = rxdesc->flags;
 611         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 612
 613         /*
 614          * Send frame to mac80211 & debugfs.
 615          * mac80211 will clean up the skb structure.
 616          */
 617         get_skb_frame_desc(entry->skb)->frame_type = DUMP_FRAME_RXDONE;
 618         rt2x00debug_dump_frame(rt2x00dev, entry->skb);
 619         ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb, rx_status);
 620         entry->skb = NULL;
 621 }
 622 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 623
 624 /*
 625  * TX descriptor initializer
 626  */
 627 void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 628                              struct sk_buff *skb,
 629                              struct ieee80211_tx_control *control)
 630 {
 631         struct txentry_desc txdesc;
 632         struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
 633         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skbdesc->data;
 634         const struct rt2x00_rate *rate;
 635         int tx_rate;
 636         int length;
 637         int duration;
 638         int residual;
 639         u16 frame_control;
 640         u16 seq_ctrl;
 641
 642         memset(&txdesc, 0, sizeof(txdesc));
 643
 644         txdesc.queue = skbdesc->entry->queue->qid;
 645         txdesc.cw_min = skbdesc->entry->queue->cw_min;
 646         txdesc.cw_max = skbdesc->entry->queue->cw_max;
 647         txdesc.aifs = skbdesc->entry->queue->aifs;
 648
 649         /*
 650          * Read required fields from ieee80211 header.
 651          */
 652         frame_control = le16_to_cpu(hdr->frame_control);
 653         seq_ctrl = le16_to_cpu(hdr->seq_ctrl);
 654
 655         tx_rate = control->tx_rate->hw_value;
 656
 657         /*
 658          * Check whether this frame is to be acked
 659          */
 660         if (!(control->flags & IEEE80211_TXCTL_NO_ACK))
 661                 __set_bit(ENTRY_TXD_ACK, &txdesc.flags);
 662
 663         /*
 664          * Check if this is a RTS/CTS frame
 665          */
 666         if (is_rts_frame(frame_control) || is_cts_frame(frame_control)) {
 667                 __set_bit(ENTRY_TXD_BURST, &txdesc.flags);
 668                 if (is_rts_frame(frame_control)) {
 669                         __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc.flags);
 670                         __set_bit(ENTRY_TXD_ACK, &txdesc.flags);
 671                 } else
 672                         __clear_bit(ENTRY_TXD_ACK, &txdesc.flags);
 673                 if (control->rts_cts_rate)
 674                         tx_rate = control->rts_cts_rate->hw_value;
 675         }
 676
 677         rate = rt2x00_get_rate(tx_rate);
 678
 679         /*
 680          * Check if more fragments are pending
 681          */
 682         if (ieee80211_get_morefrag(hdr)) {
 683                 __set_bit(ENTRY_TXD_BURST, &txdesc.flags);
 684                 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc.flags);
 685         }
 686
 687         /*
 688          * Beacons and probe responses require the tsf timestamp
 689          * to be inserted into the frame.
 690          */
 691         if (control->queue == RT2X00_BCN_QUEUE_BEACON ||
 692             is_probe_resp(frame_control))
 693                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc.flags);
 694
 695         /*
 696          * Determine with what IFS priority this frame should be send.
 697          * Set ifs to IFS_SIFS when the this is not the first fragment,
 698          * or this fragment came after RTS/CTS.
 699          */
 700         if ((seq_ctrl & IEEE80211_SCTL_FRAG) > 0 ||
 701             test_bit(ENTRY_TXD_RTS_FRAME, &txdesc.flags))
 702                 txdesc.ifs = IFS_SIFS;
 703         else
 704                 txdesc.ifs = IFS_BACKOFF;
 705
 706         /*
 707          * PLCP setup
 708          * Length calculation depends on OFDM/CCK rate.
 709          */
 710         txdesc.signal = rate->plcp;
 711         txdesc.service = 0x04;
 712
 713         length = skbdesc->data_len + FCS_LEN;
 714         if (rate->flags & DEV_RATE_OFDM) {
 715                 __set_bit(ENTRY_TXD_OFDM_RATE, &txdesc.flags);
 716
 717                 txdesc.length_high = (length >> 6) & 0x3f;
 718                 txdesc.length_low = length & 0x3f;
 719         } else {
 720                 /*
 721                  * Convert length to microseconds.
 722                  */
 723                 residual = get_duration_res(length, rate->bitrate);
 724                 duration = get_duration(length, rate->bitrate);
 725
 726                 if (residual != 0) {
 727                         duration++;
 728
 729                         /*
 730                          * Check if we need to set the Length Extension
 731                          */
 732                         if (rate->bitrate == 110 && residual <= 30)
 733                                 txdesc.service |= 0x80;
 734                 }
 735
 736                 txdesc.length_high = (duration >> 8) & 0xff;
 737                 txdesc.length_low = duration & 0xff;
 738
 739                 /*
 740                  * When preamble is enabled we should set the
 741                  * preamble bit for the signal.
 742                  */
 743                 if (rt2x00_get_rate_preamble(tx_rate))
 744                         txdesc.signal |= 0x08;
 745         }
 746
 747         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, skb, &txdesc, control);
 748
 749         /*
 750          * Update queue entry.
 751          */
 752         skbdesc->entry->skb = skb;
 753
 754         /*
 755          * The frame has been completely initialized and ready
 756          * for sending to the device. The caller will push the
 757          * frame to the device, but we are going to push the
 758          * frame to debugfs here.
 759          */
 760         skbdesc->frame_type = DUMP_FRAME_TX;
 761         rt2x00debug_dump_frame(rt2x00dev, skb);
 762 }
 763 EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc);
 764
 765 /*
 766  * Driver initialization handlers.
 767  */
 768 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 769         {
 770                 .flags = DEV_RATE_CCK | DEV_RATE_BASIC,
 771                 .bitrate = 10,
 772                 .ratemask = BIT(0),
 773                 .plcp = 0x00,
 774         },
 775         {
 776                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 777                 .bitrate = 20,
 778                 .ratemask = BIT(1),
 779                 .plcp = 0x01,
 780         },
 781         {
 782                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 783                 .bitrate = 55,
 784                 .ratemask = BIT(2),
 785                 .plcp = 0x02,
 786         },
 787         {
 788                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 789                 .bitrate = 110,
 790                 .ratemask = BIT(3),
 791                 .plcp = 0x03,
 792         },
 793         {
 794                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 795                 .bitrate = 60,
 796                 .ratemask = BIT(4),
 797                 .plcp = 0x0b,
 798         },
 799         {
 800                 .flags = DEV_RATE_OFDM,
 801                 .bitrate = 90,
 802                 .ratemask = BIT(5),
 803                 .plcp = 0x0f,
 804         },
 805         {
 806                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 807                 .bitrate = 120,
 808                 .ratemask = BIT(6),
 809                 .plcp = 0x0a,
 810         },
 811         {
 812                 .flags = DEV_RATE_OFDM,
 813                 .bitrate = 180,
 814                 .ratemask = BIT(7),
 815                 .plcp = 0x0e,
 816         },
 817         {
 818                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 819                 .bitrate = 240,
 820                 .ratemask = BIT(8),
 821                 .plcp = 0x09,
 822         },
 823         {
 824                 .flags = DEV_RATE_OFDM,
 825                 .bitrate = 360,
 826                 .ratemask = BIT(9),
 827                 .plcp = 0x0d,
 828         },
 829         {
 830                 .flags = DEV_RATE_OFDM,
 831                 .bitrate = 480,
 832                 .ratemask = BIT(10),
 833                 .plcp = 0x08,
 834         },
 835         {
 836                 .flags = DEV_RATE_OFDM,
 837                 .bitrate = 540,
 838                 .ratemask = BIT(11),
 839                 .plcp = 0x0c,
 840         },
 841 };
 842
 843 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 844                               const int channel, const int tx_power,
 845                               const int value)
 846 {
 847         entry->center_freq = ieee80211_channel_to_frequency(channel);
 848         entry->hw_value = value;
 849         entry->max_power = tx_power;
 850         entry->max_antenna_gain = 0xff;
 851 }
 852
 853 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 854                            const u16 index, const struct rt2x00_rate *rate)
 855 {
 856         entry->flags = 0;
 857         entry->bitrate = rate->bitrate;
 858         entry->hw_value = rt2x00_create_rate_hw_value(index, 0);
 859         entry->hw_value_short = entry->hw_value;
 860
 861         if (rate->flags & DEV_RATE_SHORT_PREAMBLE) {
 862                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 863                 entry->hw_value_short |= rt2x00_create_rate_hw_value(index, 1);
 864         }
 865 }
 866
 867 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 868                                     struct hw_mode_spec *spec)
 869 {
 870         struct ieee80211_hw *hw = rt2x00dev->hw;
 871         struct ieee80211_channel *channels;
 872         struct ieee80211_rate *rates;
 873         unsigned int num_rates;
 874         unsigned int i;
 875         unsigned char tx_power;
 876
 877         num_rates = 0;
 878         if (spec->supported_rates & SUPPORT_RATE_CCK)
 879                 num_rates += 4;
 880         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 881                 num_rates += 8;
 882
 883         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 884         if (!channels)
 885                 return -ENOMEM;
 886
 887         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 888         if (!rates)
 889                 goto exit_free_channels;
 890
 891         /*
 892          * Initialize Rate list.
 893          */
 894         for (i = 0; i < num_rates; i++)
 895                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 896
 897         /*
 898          * Initialize Channel list.
 899          */
 900         for (i = 0; i < spec->num_channels; i++) {
 901                 if (spec->channels[i].channel <= 14) {
 902                         if (spec->tx_power_bg)
 903                                 tx_power = spec->tx_power_bg[i];
 904                         else
 905                                 tx_power = spec->tx_power_default;
 906                 } else {
 907                         if (spec->tx_power_a)
 908                                 tx_power = spec->tx_power_a[i];
 909                         else
 910                                 tx_power = spec->tx_power_default;
 911                 }
 912
 913                 rt2x00lib_channel(&channels[i],
 914                                   spec->channels[i].channel, tx_power, i);
 915         }
 916
 917         /*
 918          * Intitialize 802.11b, 802.11g
 919          * Rates: CCK, OFDM.
 920          * Channels: 2.4 GHz
 921          */
 922         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 923                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 924                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 925                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 926                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 927                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 928                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 929         }
 930
 931         /*
 932          * Intitialize 802.11a
 933          * Rates: OFDM.
 934          * Channels: OFDM, UNII, HiperLAN2.
 935          */
 936         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 937                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 938                     spec->num_channels - 14;
 939                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 940                     num_rates - 4;
 941                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 942                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 943                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 944                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 945         }
 946
 947         return 0;
 948
 949  exit_free_channels:
 950         kfree(channels);
 951         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 952         return -ENOMEM;
 953 }
 954
 955 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 956 {
 957         if (test_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags))
 958                 ieee80211_unregister_hw(rt2x00dev->hw);
 959
 960         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 961                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 962                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 963                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 964                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 965         }
 966 }
 967
 968 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 969 {
 970         struct hw_mode_spec *spec = &rt2x00dev->spec;
 971         int status;
 972
 973         /*
 974          * Initialize HW modes.
 975          */
 976         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 977         if (status)
 978                 return status;
 979
 980         /*
 981          * Register HW.
 982          */
 983         status = ieee80211_register_hw(rt2x00dev->hw);
 984         if (status) {
 985                 rt2x00lib_remove_hw(rt2x00dev);
 986                 return status;
 987         }
 988
 989         __set_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags);
 990
 991         return 0;
 992 }
 993
 994 /*
 995  * Initialization/uninitialization handlers.
 996  */
 997 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 998 {
 999         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1000                 return;
1001
1002         /*
1003          * Unregister extra components.
1004          */
1005         rt2x00rfkill_unregister(rt2x00dev);
1006
1007         /*
1008          * Allow the HW to uninitialize.
1009          */
1010         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1011
1012         /*
1013          * Free allocated queue entries.
1014          */
1015         rt2x00queue_uninitialize(rt2x00dev);
1016 }
1017
1018 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1019 {
1020         int status;
1021
1022         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1023                 return 0;
1024
1025         /*
1026          * Allocate all queue entries.
1027          */
1028         status = rt2x00queue_initialize(rt2x00dev);
1029         if (status)
1030                 return status;
1031
1032         /*
1033          * Initialize the device.
1034          */
1035         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1036         if (status) {
1037                 rt2x00queue_uninitialize(rt2x00dev);
1038                 return status;
1039         }
1040
1041         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
1042
1043         /*
1044          * Register the extra components.
1045          */
1046         rt2x00rfkill_register(rt2x00dev);
1047
1048         return 0;
1049 }
1050
1051 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1052 {
1053         int retval;
1054
1055         if (test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1056                 return 0;
1057
1058         /*
1059          * If this is the first interface which is added,
1060          * we should load the firmware now.
1061          */
1062         retval = rt2x00lib_load_firmware(rt2x00dev);
1063         if (retval)
1064                 return retval;
1065
1066         /*
1067          * Initialize the device.
1068          */
1069         retval = rt2x00lib_initialize(rt2x00dev);
1070         if (retval)
1071                 return retval;
1072
1073         /*
1074          * Enable radio.
1075          */
1076         retval = rt2x00lib_enable_radio(rt2x00dev);
1077         if (retval) {
1078                 rt2x00lib_uninitialize(rt2x00dev);
1079                 return retval;
1080         }
1081
1082         rt2x00dev->intf_ap_count = 0;
1083         rt2x00dev->intf_sta_count = 0;
1084         rt2x00dev->intf_associated = 0;
1085
1086         __set_bit(DEVICE_STARTED, &rt2x00dev->flags);
1087
1088         return 0;
1089 }
1090
1091 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1092 {
1093         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1094                 return;
1095
1096         /*
1097          * Perhaps we can add something smarter here,
1098          * but for now just disabling the radio should do.
1099          */
1100         rt2x00lib_disable_radio(rt2x00dev);
1101
1102         rt2x00dev->intf_ap_count = 0;
1103         rt2x00dev->intf_sta_count = 0;
1104         rt2x00dev->intf_associated = 0;
1105
1106         __clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
1107 }
1108
1109 /*
1110  * driver allocation handlers.
1111  */
1112 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1113 {
1114         int retval = -ENOMEM;
1115
1116         /*
1117          * Make room for rt2x00_intf inside the per-interface
1118          * structure ieee80211_vif.
1119          */
1120         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1121
1122         /*
1123          * Let the driver probe the device to detect the capabilities.
1124          */
1125         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1126         if (retval) {
1127                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1128                 goto exit;
1129         }
1130
1131         /*
1132          * Initialize configuration work.
1133          */
1134         rt2x00dev->workqueue = create_singlethread_workqueue("rt2x00lib");
1135         if (!rt2x00dev->workqueue)
1136                 goto exit;
1137
1138         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1139         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
1140         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
1141
1142         /*
1143          * Allocate queue array.
1144          */
1145         retval = rt2x00queue_allocate(rt2x00dev);
1146         if (retval)
1147                 goto exit;
1148
1149         /*
1150          * Initialize ieee80211 structure.
1151          */
1152         retval = rt2x00lib_probe_hw(rt2x00dev);
1153         if (retval) {
1154                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1155                 goto exit;
1156         }
1157
1158         /*
1159          * Register extra components.
1160          */
1161         rt2x00leds_register(rt2x00dev);
1162         rt2x00rfkill_allocate(rt2x00dev);
1163         rt2x00debug_register(rt2x00dev);
1164
1165         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1166
1167         return 0;
1168
1169 exit:
1170         rt2x00lib_remove_dev(rt2x00dev);
1171
1172         return retval;
1173 }
1174 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1175
1176 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1177 {
1178         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1179
1180         /*
1181          * Disable radio.
1182          */
1183         rt2x00lib_disable_radio(rt2x00dev);
1184
1185         /*
1186          * Uninitialize device.
1187          */
1188         rt2x00lib_uninitialize(rt2x00dev);
1189
1190         /*
1191          * Free extra components
1192          */
1193         rt2x00debug_deregister(rt2x00dev);
1194         rt2x00rfkill_free(rt2x00dev);
1195         rt2x00leds_unregister(rt2x00dev);
1196
1197         /*
1198          * Stop all queued work. Note that most tasks will already be halted
1199          * during rt2x00lib_disable_radio() and rt2x00lib_uninitialize().
1200          */
1201         flush_workqueue(rt2x00dev->workqueue);
1202         destroy_workqueue(rt2x00dev->workqueue);
1203
1204         /*
1205          * Free ieee80211_hw memory.
1206          */
1207         rt2x00lib_remove_hw(rt2x00dev);
1208
1209         /*
1210          * Free firmware image.
1211          */
1212         rt2x00lib_free_firmware(rt2x00dev);
1213
1214         /*
1215          * Free queue structures.
1216          */
1217         rt2x00queue_free(rt2x00dev);
1218 }
1219 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1220
1221 /*
1222  * Device state handlers
1223  */
1224 #ifdef CONFIG_PM
1225 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1226 {
1227         int retval;
1228
1229         NOTICE(rt2x00dev, "Going to sleep.\n");
1230         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1231
1232         /*
1233          * Only continue if mac80211 has open interfaces.
1234          */
1235         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1236                 goto exit;
1237         __set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
1238
1239         /*
1240          * Disable radio.
1241          */
1242         rt2x00lib_stop(rt2x00dev);
1243         rt2x00lib_uninitialize(rt2x00dev);
1244
1245         /*
1246          * Suspend/disable extra components.
1247          */
1248         rt2x00leds_suspend(rt2x00dev);
1249         rt2x00rfkill_suspend(rt2x00dev);
1250         rt2x00debug_deregister(rt2x00dev);
1251
1252 exit:
1253         /*
1254          * Set device mode to sleep for power management,
1255          * on some hardware this call seems to consistently fail.
1256          * From the specifications it is hard to tell why it fails,
1257          * and if this is a "bad thing".
1258          * Overall it is safe to just ignore the failure and
1259          * continue suspending. The only downside is that the
1260          * device will not be in optimal power save mode, but with
1261          * the radio and the other components already disabled the
1262          * device is as good as disabled.
1263          */
1264         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1265         if (retval)
1266                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1267                         "continue suspending.\n");
1268
1269         return 0;
1270 }
1271 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1272
1273 static void rt2x00lib_resume_intf(void *data, u8 *mac,
1274                                   struct ieee80211_vif *vif)
1275 {
1276         struct rt2x00_dev *rt2x00dev = data;
1277         struct rt2x00_intf *intf = vif_to_intf(vif);
1278
1279         spin_lock(&intf->lock);
1280
1281         rt2x00lib_config_intf(rt2x00dev, intf,
1282                               vif->type, intf->mac, intf->bssid);
1283
1284
1285         /*
1286          * Master or Ad-hoc mode require a new beacon update.
1287          */
1288         if (vif->type == IEEE80211_IF_TYPE_AP ||
1289             vif->type == IEEE80211_IF_TYPE_IBSS)
1290                 intf->delayed_flags |= DELAYED_UPDATE_BEACON;
1291
1292         spin_unlock(&intf->lock);
1293 }
1294
1295 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1296 {
1297         int retval;
1298
1299         NOTICE(rt2x00dev, "Waking up.\n");
1300
1301         /*
1302          * Restore/enable extra components.
1303          */
1304         rt2x00debug_register(rt2x00dev);
1305         rt2x00rfkill_resume(rt2x00dev);
1306         rt2x00leds_resume(rt2x00dev);
1307
1308         /*
1309          * Only continue if mac80211 had open interfaces.
1310          */
1311         if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
1312                 return 0;
1313
1314         /*
1315          * Reinitialize device and all active interfaces.
1316          */
1317         retval = rt2x00lib_start(rt2x00dev);
1318         if (retval)
1319                 goto exit;
1320
1321         /*
1322          * Reconfigure device.
1323          */
1324         rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
1325         if (!rt2x00dev->hw->conf.radio_enabled)
1326                 rt2x00lib_disable_radio(rt2x00dev);
1327
1328         /*
1329          * Iterator over each active interface to
1330          * reconfigure the hardware.
1331          */
1332         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
1333                                             rt2x00lib_resume_intf, rt2x00dev);
1334
1335         /*
1336          * We are ready again to receive requests from mac80211.
1337          */
1338         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1339
1340         /*
1341          * It is possible that during that mac80211 has attempted
1342          * to send frames while we were suspending or resuming.
1343          * In that case we have disabled the TX queue and should
1344          * now enable it again
1345          */
1346         ieee80211_start_queues(rt2x00dev->hw);
1347
1348         /*
1349          * During interface iteration we might have changed the
1350          * delayed_flags, time to handles the event by calling
1351          * the work handler directly.
1352          */
1353         rt2x00lib_intf_scheduled(&rt2x00dev->intf_work);
1354
1355         return 0;
1356
1357 exit:
1358         rt2x00lib_disable_radio(rt2x00dev);
1359         rt2x00lib_uninitialize(rt2x00dev);
1360         rt2x00debug_deregister(rt2x00dev);
1361
1362         return retval;
1363 }
1364 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1365 #endif /* CONFIG_PM */
1366
1367 /*
1368  * rt2x00lib module information.
1369  */
1370 MODULE_AUTHOR(DRV_PROJECT);
1371 MODULE_VERSION(DRV_VERSION);
1372 MODULE_DESCRIPTION("rt2x00 library");
1373 MODULE_LICENSE("GPL");