err.no Git - linux-2.6/blob - drivers/net/wireless/rt2x00/rt2x00dev.c

   1 /*
   2         Copyright (C) 2004 - 2007 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  * Ring handler.
  34  */
  35 struct data_ring *rt2x00lib_get_ring(struct rt2x00_dev *rt2x00dev,
  36                                      const unsigned int queue)
  37 {
  38         int beacon = test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags);
  39
  40         /*
  41          * Check if we are requesting a reqular TX ring,
  42          * or if we are requesting a Beacon or Atim ring.
  43          * For Atim rings, we should check if it is supported.
  44          */
  45         if (queue < rt2x00dev->hw->queues && rt2x00dev->tx)
  46                 return &rt2x00dev->tx[queue];
  47
  48         if (!rt2x00dev->bcn || !beacon)
  49                 return NULL;
  50
  51         if (queue == IEEE80211_TX_QUEUE_BEACON)
  52                 return &rt2x00dev->bcn[0];
  53         else if (queue == IEEE80211_TX_QUEUE_AFTER_BEACON)
  54                 return &rt2x00dev->bcn[1];
  55
  56         return NULL;
  57 }
  58 EXPORT_SYMBOL_GPL(rt2x00lib_get_ring);
  59
  60 /*
  61  * Link tuning handlers
  62  */
  63 static void rt2x00lib_start_link_tuner(struct rt2x00_dev *rt2x00dev)
  64 {
  65         rt2x00dev->link.count = 0;
  66         rt2x00dev->link.vgc_level = 0;
  67
  68         memset(&rt2x00dev->link.qual, 0, sizeof(rt2x00dev->link.qual));
  69
  70         /*
  71          * The RX and TX percentage should start at 50%
  72          * this will assure we will get at least get some
  73          * decent value when the link tuner starts.
  74          * The value will be dropped and overwritten with
  75          * the correct (measured )value anyway during the
  76          * first run of the link tuner.
  77          */
  78         rt2x00dev->link.qual.rx_percentage = 50;
  79         rt2x00dev->link.qual.tx_percentage = 50;
  80
  81         /*
  82          * Reset the link tuner.
  83          */
  84         rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
  85
  86         queue_delayed_work(rt2x00dev->hw->workqueue,
  87                            &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
  88 }
  89
  90 static void rt2x00lib_stop_link_tuner(struct rt2x00_dev *rt2x00dev)
  91 {
  92         cancel_delayed_work_sync(&rt2x00dev->link.work);
  93 }
  94
  95 void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
  96 {
  97         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
  98                 return;
  99
 100         rt2x00lib_stop_link_tuner(rt2x00dev);
 101         rt2x00lib_start_link_tuner(rt2x00dev);
 102 }
 103
 104 /*
 105  * Radio control handlers.
 106  */
 107 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
 108 {
 109         int status;
 110
 111         /*
 112          * Don't enable the radio twice.
 113          * And check if the hardware button has been disabled.
 114          */
 115         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 116             test_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags))
 117                 return 0;
 118
 119         /*
 120          * Enable radio.
 121          */
 122         status = rt2x00dev->ops->lib->set_device_state(rt2x00dev,
 123                                                        STATE_RADIO_ON);
 124         if (status)
 125                 return status;
 126
 127         __set_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags);
 128
 129         /*
 130          * Enable RX.
 131          */
 132         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 133
 134         /*
 135          * Start the TX queues.
 136          */
 137         ieee80211_start_queues(rt2x00dev->hw);
 138
 139         return 0;
 140 }
 141
 142 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
 143 {
 144         if (!__test_and_clear_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 145                 return;
 146
 147         /*
 148          * Stop all scheduled work.
 149          */
 150         if (work_pending(&rt2x00dev->beacon_work))
 151                 cancel_work_sync(&rt2x00dev->beacon_work);
 152         if (work_pending(&rt2x00dev->filter_work))
 153                 cancel_work_sync(&rt2x00dev->filter_work);
 154         if (work_pending(&rt2x00dev->config_work))
 155                 cancel_work_sync(&rt2x00dev->config_work);
 156
 157         /*
 158          * Stop the TX queues.
 159          */
 160         ieee80211_stop_queues(rt2x00dev->hw);
 161
 162         /*
 163          * Disable RX.
 164          */
 165         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 166
 167         /*
 168          * Disable radio.
 169          */
 170         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 171 }
 172
 173 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 174 {
 175         /*
 176          * When we are disabling the RX, we should also stop the link tuner.
 177          */
 178         if (state == STATE_RADIO_RX_OFF)
 179                 rt2x00lib_stop_link_tuner(rt2x00dev);
 180
 181         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 182
 183         /*
 184          * When we are enabling the RX, we should also start the link tuner.
 185          */
 186         if (state == STATE_RADIO_RX_ON &&
 187             is_interface_present(&rt2x00dev->interface))
 188                 rt2x00lib_start_link_tuner(rt2x00dev);
 189 }
 190
 191 static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev *rt2x00dev)
 192 {
 193         enum antenna rx = rt2x00dev->link.ant.active.rx;
 194         enum antenna tx = rt2x00dev->link.ant.active.tx;
 195         int sample_a =
 196             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_A);
 197         int sample_b =
 198             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_B);
 199
 200         /*
 201          * We are done sampling. Now we should evaluate the results.
 202          */
 203         rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
 204
 205         /*
 206          * During the last period we have sampled the RSSI
 207          * from both antenna's. It now is time to determine
 208          * which antenna demonstrated the best performance.
 209          * When we are already on the antenna with the best
 210          * performance, then there really is nothing for us
 211          * left to do.
 212          */
 213         if (sample_a == sample_b)
 214                 return;
 215
 216         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) {
 217                 if (sample_a > sample_b && rx == ANTENNA_B)
 218                         rx = ANTENNA_A;
 219                 else if (rx == ANTENNA_A)
 220                         rx = ANTENNA_B;
 221         }
 222
 223         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY) {
 224                 if (sample_a > sample_b && tx == ANTENNA_B)
 225                         tx = ANTENNA_A;
 226                 else if (tx == ANTENNA_A)
 227                         tx = ANTENNA_B;
 228         }
 229
 230         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 231 }
 232
 233 static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
 234 {
 235         enum antenna rx = rt2x00dev->link.ant.active.rx;
 236         enum antenna tx = rt2x00dev->link.ant.active.tx;
 237         int rssi_curr = rt2x00_get_link_ant_rssi(&rt2x00dev->link);
 238         int rssi_old = rt2x00_update_ant_rssi(&rt2x00dev->link, rssi_curr);
 239
 240         /*
 241          * Legacy driver indicates that we should swap antenna's
 242          * when the difference in RSSI is greater that 5. This
 243          * also should be done when the RSSI was actually better
 244          * then the previous sample.
 245          * When the difference exceeds the threshold we should
 246          * sample the rssi from the other antenna to make a valid
 247          * comparison between the 2 antennas.
 248          */
 249         if ((rssi_curr - rssi_old) > -5 || (rssi_curr - rssi_old) < 5)
 250                 return;
 251
 252         rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;
 253
 254         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 255                 rx = (rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 256
 257         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 258                 tx = (tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 259
 260         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 261 }
 262
 263 static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
 264 {
 265         /*
 266          * Determine if software diversity is enabled for
 267          * either the TX or RX antenna (or both).
 268          * Always perform this check since within the link
 269          * tuner interval the configuration might have changed.
 270          */
 271         rt2x00dev->link.ant.flags &= ~ANTENNA_RX_DIVERSITY;
 272         rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;
 273
 274         if (rt2x00dev->hw->conf.antenna_sel_rx == 0 &&
 275             rt2x00dev->default_ant.rx != ANTENNA_SW_DIVERSITY)
 276                 rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
 277         if (rt2x00dev->hw->conf.antenna_sel_tx == 0 &&
 278             rt2x00dev->default_ant.tx != ANTENNA_SW_DIVERSITY)
 279                 rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;
 280
 281         if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&
 282             !(rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)) {
 283                 rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
 284                 return;
 285         }
 286
 287         /*
 288          * If we have only sampled the data over the last period
 289          * we should now harvest the data. Otherwise just evaluate
 290          * the data. The latter should only be performed once
 291          * every 2 seconds.
 292          */
 293         if (rt2x00dev->link.ant.flags & ANTENNA_MODE_SAMPLE)
 294                 rt2x00lib_evaluate_antenna_sample(rt2x00dev);
 295         else if (rt2x00dev->link.count & 1)
 296                 rt2x00lib_evaluate_antenna_eval(rt2x00dev);
 297 }
 298
 299 static void rt2x00lib_update_link_stats(struct link *link, int rssi)
 300 {
 301         int avg_rssi = rssi;
 302
 303         /*
 304          * Update global RSSI
 305          */
 306         if (link->qual.avg_rssi)
 307                 avg_rssi = MOVING_AVERAGE(link->qual.avg_rssi, rssi, 8);
 308         link->qual.avg_rssi = avg_rssi;
 309
 310         /*
 311          * Update antenna RSSI
 312          */
 313         if (link->ant.rssi_ant)
 314                 rssi = MOVING_AVERAGE(link->ant.rssi_ant, rssi, 8);
 315         link->ant.rssi_ant = rssi;
 316 }
 317
 318 static void rt2x00lib_precalculate_link_signal(struct link_qual *qual)
 319 {
 320         if (qual->rx_failed || qual->rx_success)
 321                 qual->rx_percentage =
 322                     (qual->rx_success * 100) /
 323                     (qual->rx_failed + qual->rx_success);
 324         else
 325                 qual->rx_percentage = 50;
 326
 327         if (qual->tx_failed || qual->tx_success)
 328                 qual->tx_percentage =
 329                     (qual->tx_success * 100) /
 330                     (qual->tx_failed + qual->tx_success);
 331         else
 332                 qual->tx_percentage = 50;
 333
 334         qual->rx_success = 0;
 335         qual->rx_failed = 0;
 336         qual->tx_success = 0;
 337         qual->tx_failed = 0;
 338 }
 339
 340 static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
 341                                            int rssi)
 342 {
 343         int rssi_percentage = 0;
 344         int signal;
 345
 346         /*
 347          * We need a positive value for the RSSI.
 348          */
 349         if (rssi < 0)
 350                 rssi += rt2x00dev->rssi_offset;
 351
 352         /*
 353          * Calculate the different percentages,
 354          * which will be used for the signal.
 355          */
 356         if (rt2x00dev->rssi_offset)
 357                 rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
 358
 359         /*
 360          * Add the individual percentages and use the WEIGHT
 361          * defines to calculate the current link signal.
 362          */
 363         signal = ((WEIGHT_RSSI * rssi_percentage) +
 364                   (WEIGHT_TX * rt2x00dev->link.qual.tx_percentage) +
 365                   (WEIGHT_RX * rt2x00dev->link.qual.rx_percentage)) / 100;
 366
 367         return (signal > 100) ? 100 : signal;
 368 }
 369
 370 static void rt2x00lib_link_tuner(struct work_struct *work)
 371 {
 372         struct rt2x00_dev *rt2x00dev =
 373             container_of(work, struct rt2x00_dev, link.work.work);
 374
 375         /*
 376          * When the radio is shutting down we should
 377          * immediately cease all link tuning.
 378          */
 379         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 380                 return;
 381
 382         /*
 383          * Update statistics.
 384          */
 385         rt2x00dev->ops->lib->link_stats(rt2x00dev, &rt2x00dev->link.qual);
 386         rt2x00dev->low_level_stats.dot11FCSErrorCount +=
 387             rt2x00dev->link.qual.rx_failed;
 388
 389         /*
 390          * Only perform the link tuning when Link tuning
 391          * has been enabled (This could have been disabled from the EEPROM).
 392          */
 393         if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
 394                 rt2x00dev->ops->lib->link_tuner(rt2x00dev);
 395
 396         /*
 397          * Evaluate antenna setup.
 398          */
 399         rt2x00lib_evaluate_antenna(rt2x00dev);
 400
 401         /*
 402          * Precalculate a portion of the link signal which is
 403          * in based on the tx/rx success/failure counters.
 404          */
 405         rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
 406
 407         /*
 408          * Increase tuner counter, and reschedule the next link tuner run.
 409          */
 410         rt2x00dev->link.count++;
 411         queue_delayed_work(rt2x00dev->hw->workqueue, &rt2x00dev->link.work,
 412                            LINK_TUNE_INTERVAL);
 413 }
 414
 415 static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
 416 {
 417         struct rt2x00_dev *rt2x00dev =
 418             container_of(work, struct rt2x00_dev, filter_work);
 419         unsigned int filter = rt2x00dev->interface.filter;
 420
 421         /*
 422          * Since we had stored the filter inside interface.filter,
 423          * we should now clear that field. Otherwise the driver will
 424          * assume nothing has changed (*total_flags will be compared
 425          * to interface.filter to determine if any action is required).
 426          */
 427         rt2x00dev->interface.filter = 0;
 428
 429         rt2x00dev->ops->hw->configure_filter(rt2x00dev->hw,
 430                                              filter, &filter, 0, NULL);
 431 }
 432
 433 static void rt2x00lib_configuration_scheduled(struct work_struct *work)
 434 {
 435         struct rt2x00_dev *rt2x00dev =
 436             container_of(work, struct rt2x00_dev, config_work);
 437         int preamble = !test_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
 438
 439         rt2x00mac_erp_ie_changed(rt2x00dev->hw,
 440                                  IEEE80211_ERP_CHANGE_PREAMBLE, 0, preamble);
 441 }
 442
 443 /*
 444  * Interrupt context handlers.
 445  */
 446 static void rt2x00lib_beacondone_scheduled(struct work_struct *work)
 447 {
 448         struct rt2x00_dev *rt2x00dev =
 449             container_of(work, struct rt2x00_dev, beacon_work);
 450         struct data_ring *ring =
 451             rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
 452         struct data_entry *entry = rt2x00_get_data_entry(ring);
 453         struct sk_buff *skb;
 454
 455         skb = ieee80211_beacon_get(rt2x00dev->hw,
 456                                    rt2x00dev->interface.id,
 457                                    &entry->tx_status.control);
 458         if (!skb)
 459                 return;
 460
 461         rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, skb,
 462                                           &entry->tx_status.control);
 463
 464         dev_kfree_skb(skb);
 465 }
 466
 467 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 468 {
 469         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 470                 return;
 471
 472         queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->beacon_work);
 473 }
 474 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 475
 476 void rt2x00lib_txdone(struct data_entry *entry,
 477                       const int status, const int retry)
 478 {
 479         struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
 480         struct ieee80211_tx_status *tx_status = &entry->tx_status;
 481         struct ieee80211_low_level_stats *stats = &rt2x00dev->low_level_stats;
 482         int success = !!(status == TX_SUCCESS || status == TX_SUCCESS_RETRY);
 483         int fail = !!(status == TX_FAIL_RETRY || status == TX_FAIL_INVALID ||
 484                       status == TX_FAIL_OTHER);
 485
 486         /*
 487          * Update TX statistics.
 488          */
 489         tx_status->flags = 0;
 490         tx_status->ack_signal = 0;
 491         tx_status->excessive_retries = (status == TX_FAIL_RETRY);
 492         tx_status->retry_count = retry;
 493         rt2x00dev->link.qual.tx_success += success;
 494         rt2x00dev->link.qual.tx_failed += retry + fail;
 495
 496         if (!(tx_status->control.flags & IEEE80211_TXCTL_NO_ACK)) {
 497                 if (success)
 498                         tx_status->flags |= IEEE80211_TX_STATUS_ACK;
 499                 else
 500                         stats->dot11ACKFailureCount++;
 501         }
 502
 503         tx_status->queue_length = entry->ring->stats.limit;
 504         tx_status->queue_number = tx_status->control.queue;
 505
 506         if (tx_status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) {
 507                 if (success)
 508                         stats->dot11RTSSuccessCount++;
 509                 else
 510                         stats->dot11RTSFailureCount++;
 511         }
 512
 513         /*
 514          * Send the tx_status to mac80211,
 515          * that method also cleans up the skb structure.
 516          */
 517         ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb, tx_status);
 518         entry->skb = NULL;
 519 }
 520 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 521
 522 void rt2x00lib_rxdone(struct data_entry *entry, struct sk_buff *skb,
 523                       struct rxdata_entry_desc *desc)
 524 {
 525         struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
 526         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 527         struct ieee80211_hw_mode *mode;
 528         struct ieee80211_rate *rate;
 529         unsigned int i;
 530         int val = 0;
 531
 532         /*
 533          * Update RX statistics.
 534          */
 535         mode = &rt2x00dev->hwmodes[rt2x00dev->curr_hwmode];
 536         for (i = 0; i < mode->num_rates; i++) {
 537                 rate = &mode->rates[i];
 538
 539                 /*
 540                  * When frame was received with an OFDM bitrate,
 541                  * the signal is the PLCP value. If it was received with
 542                  * a CCK bitrate the signal is the rate in 0.5kbit/s.
 543                  */
 544                 if (!desc->ofdm)
 545                         val = DEVICE_GET_RATE_FIELD(rate->val, RATE);
 546                 else
 547                         val = DEVICE_GET_RATE_FIELD(rate->val, PLCP);
 548
 549                 if (val == desc->signal) {
 550                         val = rate->val;
 551                         break;
 552                 }
 553         }
 554
 555         rt2x00lib_update_link_stats(&rt2x00dev->link, desc->rssi);
 556         rt2x00dev->link.qual.rx_success++;
 557
 558         rx_status->rate = val;
 559         rx_status->signal =
 560             rt2x00lib_calculate_link_signal(rt2x00dev, desc->rssi);
 561         rx_status->ssi = desc->rssi;
 562         rx_status->flag = desc->flags;
 563         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 564
 565         /*
 566          * Send frame to mac80211
 567          */
 568         ieee80211_rx_irqsafe(rt2x00dev->hw, skb, rx_status);
 569 }
 570 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 571
 572 /*
 573  * TX descriptor initializer
 574  */
 575 void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 576                              struct sk_buff *skb,
 577                              struct ieee80211_tx_control *control)
 578 {
 579         struct txdata_entry_desc desc;
 580         struct skb_desc *skbdesc = get_skb_desc(skb);
 581         struct ieee80211_hdr *ieee80211hdr = skbdesc->data;
 582         __le32 *txd = skbdesc->desc;
 583         int tx_rate;
 584         int bitrate;
 585         int length;
 586         int duration;
 587         int residual;
 588         u16 frame_control;
 589         u16 seq_ctrl;
 590
 591         memset(&desc, 0, sizeof(desc));
 592
 593         desc.cw_min = skbdesc->ring->tx_params.cw_min;
 594         desc.cw_max = skbdesc->ring->tx_params.cw_max;
 595         desc.aifs = skbdesc->ring->tx_params.aifs;
 596
 597         /*
 598          * Identify queue
 599          */
 600         if (control->queue < rt2x00dev->hw->queues)
 601                 desc.queue = control->queue;
 602         else if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 603                  control->queue == IEEE80211_TX_QUEUE_AFTER_BEACON)
 604                 desc.queue = QUEUE_MGMT;
 605         else
 606                 desc.queue = QUEUE_OTHER;
 607
 608         /*
 609          * Read required fields from ieee80211 header.
 610          */
 611         frame_control = le16_to_cpu(ieee80211hdr->frame_control);
 612         seq_ctrl = le16_to_cpu(ieee80211hdr->seq_ctrl);
 613
 614         tx_rate = control->tx_rate;
 615
 616         /*
 617          * Check whether this frame is to be acked
 618          */
 619         if (!(control->flags & IEEE80211_TXCTL_NO_ACK))
 620                 __set_bit(ENTRY_TXD_ACK, &desc.flags);
 621
 622         /*
 623          * Check if this is a RTS/CTS frame
 624          */
 625         if (is_rts_frame(frame_control) || is_cts_frame(frame_control)) {
 626                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 627                 if (is_rts_frame(frame_control)) {
 628                         __set_bit(ENTRY_TXD_RTS_FRAME, &desc.flags);
 629                         __set_bit(ENTRY_TXD_ACK, &desc.flags);
 630                 } else
 631                         __clear_bit(ENTRY_TXD_ACK, &desc.flags);
 632                 if (control->rts_cts_rate)
 633                         tx_rate = control->rts_cts_rate;
 634         }
 635
 636         /*
 637          * Check for OFDM
 638          */
 639         if (DEVICE_GET_RATE_FIELD(tx_rate, RATEMASK) & DEV_OFDM_RATEMASK)
 640                 __set_bit(ENTRY_TXD_OFDM_RATE, &desc.flags);
 641
 642         /*
 643          * Check if more fragments are pending
 644          */
 645         if (ieee80211_get_morefrag(ieee80211hdr)) {
 646                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 647                 __set_bit(ENTRY_TXD_MORE_FRAG, &desc.flags);
 648         }
 649
 650         /*
 651          * Beacons and probe responses require the tsf timestamp
 652          * to be inserted into the frame.
 653          */
 654         if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 655             is_probe_resp(frame_control))
 656                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &desc.flags);
 657
 658         /*
 659          * Determine with what IFS priority this frame should be send.
 660          * Set ifs to IFS_SIFS when the this is not the first fragment,
 661          * or this fragment came after RTS/CTS.
 662          */
 663         if ((seq_ctrl & IEEE80211_SCTL_FRAG) > 0 ||
 664             test_bit(ENTRY_TXD_RTS_FRAME, &desc.flags))
 665                 desc.ifs = IFS_SIFS;
 666         else
 667                 desc.ifs = IFS_BACKOFF;
 668
 669         /*
 670          * PLCP setup
 671          * Length calculation depends on OFDM/CCK rate.
 672          */
 673         desc.signal = DEVICE_GET_RATE_FIELD(tx_rate, PLCP);
 674         desc.service = 0x04;
 675
 676         length = skbdesc->data_len + FCS_LEN;
 677         if (test_bit(ENTRY_TXD_OFDM_RATE, &desc.flags)) {
 678                 desc.length_high = (length >> 6) & 0x3f;
 679                 desc.length_low = length & 0x3f;
 680         } else {
 681                 bitrate = DEVICE_GET_RATE_FIELD(tx_rate, RATE);
 682
 683                 /*
 684                  * Convert length to microseconds.
 685                  */
 686                 residual = get_duration_res(length, bitrate);
 687                 duration = get_duration(length, bitrate);
 688
 689                 if (residual != 0) {
 690                         duration++;
 691
 692                         /*
 693                          * Check if we need to set the Length Extension
 694                          */
 695                         if (bitrate == 110 && residual <= 30)
 696                                 desc.service |= 0x80;
 697                 }
 698
 699                 desc.length_high = (duration >> 8) & 0xff;
 700                 desc.length_low = duration & 0xff;
 701
 702                 /*
 703                  * When preamble is enabled we should set the
 704                  * preamble bit for the signal.
 705                  */
 706                 if (DEVICE_GET_RATE_FIELD(tx_rate, PREAMBLE))
 707                         desc.signal |= 0x08;
 708         }
 709
 710         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, txd, &desc, ieee80211hdr,
 711                                            skbdesc->data_len, control);
 712
 713         /*
 714          * Update ring entry.
 715          */
 716         skbdesc->entry->skb = skb;
 717         memcpy(&skbdesc->entry->tx_status.control, control, sizeof(*control));
 718 }
 719 EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc);
 720
 721 /*
 722  * Driver initialization handlers.
 723  */
 724 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 725                               const int channel, const int tx_power,
 726                               const int value)
 727 {
 728         entry->chan = channel;
 729         if (channel <= 14)
 730                 entry->freq = 2407 + (5 * channel);
 731         else
 732                 entry->freq = 5000 + (5 * channel);
 733         entry->val = value;
 734         entry->flag =
 735             IEEE80211_CHAN_W_IBSS |
 736             IEEE80211_CHAN_W_ACTIVE_SCAN |
 737             IEEE80211_CHAN_W_SCAN;
 738         entry->power_level = tx_power;
 739         entry->antenna_max = 0xff;
 740 }
 741
 742 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 743                            const int rate, const int mask,
 744                            const int plcp, const int flags)
 745 {
 746         entry->rate = rate;
 747         entry->val =
 748             DEVICE_SET_RATE_FIELD(rate, RATE) |
 749             DEVICE_SET_RATE_FIELD(mask, RATEMASK) |
 750             DEVICE_SET_RATE_FIELD(plcp, PLCP);
 751         entry->flags = flags;
 752         entry->val2 = entry->val;
 753         if (entry->flags & IEEE80211_RATE_PREAMBLE2)
 754                 entry->val2 |= DEVICE_SET_RATE_FIELD(1, PREAMBLE);
 755         entry->min_rssi_ack = 0;
 756         entry->min_rssi_ack_delta = 0;
 757 }
 758
 759 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 760                                     struct hw_mode_spec *spec)
 761 {
 762         struct ieee80211_hw *hw = rt2x00dev->hw;
 763         struct ieee80211_hw_mode *hwmodes;
 764         struct ieee80211_channel *channels;
 765         struct ieee80211_rate *rates;
 766         unsigned int i;
 767         unsigned char tx_power;
 768
 769         hwmodes = kzalloc(sizeof(*hwmodes) * spec->num_modes, GFP_KERNEL);
 770         if (!hwmodes)
 771                 goto exit;
 772
 773         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 774         if (!channels)
 775                 goto exit_free_modes;
 776
 777         rates = kzalloc(sizeof(*rates) * spec->num_rates, GFP_KERNEL);
 778         if (!rates)
 779                 goto exit_free_channels;
 780
 781         /*
 782          * Initialize Rate list.
 783          */
 784         rt2x00lib_rate(&rates[0], 10, DEV_RATEMASK_1MB,
 785                        0x00, IEEE80211_RATE_CCK);
 786         rt2x00lib_rate(&rates[1], 20, DEV_RATEMASK_2MB,
 787                        0x01, IEEE80211_RATE_CCK_2);
 788         rt2x00lib_rate(&rates[2], 55, DEV_RATEMASK_5_5MB,
 789                        0x02, IEEE80211_RATE_CCK_2);
 790         rt2x00lib_rate(&rates[3], 110, DEV_RATEMASK_11MB,
 791                        0x03, IEEE80211_RATE_CCK_2);
 792
 793         if (spec->num_rates > 4) {
 794                 rt2x00lib_rate(&rates[4], 60, DEV_RATEMASK_6MB,
 795                                0x0b, IEEE80211_RATE_OFDM);
 796                 rt2x00lib_rate(&rates[5], 90, DEV_RATEMASK_9MB,
 797                                0x0f, IEEE80211_RATE_OFDM);
 798                 rt2x00lib_rate(&rates[6], 120, DEV_RATEMASK_12MB,
 799                                0x0a, IEEE80211_RATE_OFDM);
 800                 rt2x00lib_rate(&rates[7], 180, DEV_RATEMASK_18MB,
 801                                0x0e, IEEE80211_RATE_OFDM);
 802                 rt2x00lib_rate(&rates[8], 240, DEV_RATEMASK_24MB,
 803                                0x09, IEEE80211_RATE_OFDM);
 804                 rt2x00lib_rate(&rates[9], 360, DEV_RATEMASK_36MB,
 805                                0x0d, IEEE80211_RATE_OFDM);
 806                 rt2x00lib_rate(&rates[10], 480, DEV_RATEMASK_48MB,
 807                                0x08, IEEE80211_RATE_OFDM);
 808                 rt2x00lib_rate(&rates[11], 540, DEV_RATEMASK_54MB,
 809                                0x0c, IEEE80211_RATE_OFDM);
 810         }
 811
 812         /*
 813          * Initialize Channel list.
 814          */
 815         for (i = 0; i < spec->num_channels; i++) {
 816                 if (spec->channels[i].channel <= 14)
 817                         tx_power = spec->tx_power_bg[i];
 818                 else if (spec->tx_power_a)
 819                         tx_power = spec->tx_power_a[i];
 820                 else
 821                         tx_power = spec->tx_power_default;
 822
 823                 rt2x00lib_channel(&channels[i],
 824                                   spec->channels[i].channel, tx_power, i);
 825         }
 826
 827         /*
 828          * Intitialize 802.11b
 829          * Rates: CCK.
 830          * Channels: OFDM.
 831          */
 832         if (spec->num_modes > HWMODE_B) {
 833                 hwmodes[HWMODE_B].mode = MODE_IEEE80211B;
 834                 hwmodes[HWMODE_B].num_channels = 14;
 835                 hwmodes[HWMODE_B].num_rates = 4;
 836                 hwmodes[HWMODE_B].channels = channels;
 837                 hwmodes[HWMODE_B].rates = rates;
 838         }
 839
 840         /*
 841          * Intitialize 802.11g
 842          * Rates: CCK, OFDM.
 843          * Channels: OFDM.
 844          */
 845         if (spec->num_modes > HWMODE_G) {
 846                 hwmodes[HWMODE_G].mode = MODE_IEEE80211G;
 847                 hwmodes[HWMODE_G].num_channels = 14;
 848                 hwmodes[HWMODE_G].num_rates = spec->num_rates;
 849                 hwmodes[HWMODE_G].channels = channels;
 850                 hwmodes[HWMODE_G].rates = rates;
 851         }
 852
 853         /*
 854          * Intitialize 802.11a
 855          * Rates: OFDM.
 856          * Channels: OFDM, UNII, HiperLAN2.
 857          */
 858         if (spec->num_modes > HWMODE_A) {
 859                 hwmodes[HWMODE_A].mode = MODE_IEEE80211A;
 860                 hwmodes[HWMODE_A].num_channels = spec->num_channels - 14;
 861                 hwmodes[HWMODE_A].num_rates = spec->num_rates - 4;
 862                 hwmodes[HWMODE_A].channels = &channels[14];
 863                 hwmodes[HWMODE_A].rates = &rates[4];
 864         }
 865
 866         if (spec->num_modes > HWMODE_G &&
 867             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_G]))
 868                 goto exit_free_rates;
 869
 870         if (spec->num_modes > HWMODE_B &&
 871             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_B]))
 872                 goto exit_free_rates;
 873
 874         if (spec->num_modes > HWMODE_A &&
 875             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_A]))
 876                 goto exit_free_rates;
 877
 878         rt2x00dev->hwmodes = hwmodes;
 879
 880         return 0;
 881
 882 exit_free_rates:
 883         kfree(rates);
 884
 885 exit_free_channels:
 886         kfree(channels);
 887
 888 exit_free_modes:
 889         kfree(hwmodes);
 890
 891 exit:
 892         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 893         return -ENOMEM;
 894 }
 895
 896 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 897 {
 898         if (test_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags))
 899                 ieee80211_unregister_hw(rt2x00dev->hw);
 900
 901         if (likely(rt2x00dev->hwmodes)) {
 902                 kfree(rt2x00dev->hwmodes->channels);
 903                 kfree(rt2x00dev->hwmodes->rates);
 904                 kfree(rt2x00dev->hwmodes);
 905                 rt2x00dev->hwmodes = NULL;
 906         }
 907 }
 908
 909 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 910 {
 911         struct hw_mode_spec *spec = &rt2x00dev->spec;
 912         int status;
 913
 914         /*
 915          * Initialize HW modes.
 916          */
 917         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 918         if (status)
 919                 return status;
 920
 921         /*
 922          * Register HW.
 923          */
 924         status = ieee80211_register_hw(rt2x00dev->hw);
 925         if (status) {
 926                 rt2x00lib_remove_hw(rt2x00dev);
 927                 return status;
 928         }
 929
 930         __set_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags);
 931
 932         return 0;
 933 }
 934
 935 /*
 936  * Initialization/uninitialization handlers.
 937  */
 938 static int rt2x00lib_alloc_entries(struct data_ring *ring,
 939                                    const u16 max_entries, const u16 data_size,
 940                                    const u16 desc_size)
 941 {
 942         struct data_entry *entry;
 943         unsigned int i;
 944
 945         ring->stats.limit = max_entries;
 946         ring->data_size = data_size;
 947         ring->desc_size = desc_size;
 948
 949         /*
 950          * Allocate all ring entries.
 951          */
 952         entry = kzalloc(ring->stats.limit * sizeof(*entry), GFP_KERNEL);
 953         if (!entry)
 954                 return -ENOMEM;
 955
 956         for (i = 0; i < ring->stats.limit; i++) {
 957                 entry[i].flags = 0;
 958                 entry[i].ring = ring;
 959                 entry[i].skb = NULL;
 960         }
 961
 962         ring->entry = entry;
 963
 964         return 0;
 965 }
 966
 967 static int rt2x00lib_alloc_ring_entries(struct rt2x00_dev *rt2x00dev)
 968 {
 969         struct data_ring *ring;
 970
 971         /*
 972          * Allocate the RX ring.
 973          */
 974         if (rt2x00lib_alloc_entries(rt2x00dev->rx, RX_ENTRIES, DATA_FRAME_SIZE,
 975                                     rt2x00dev->ops->rxd_size))
 976                 return -ENOMEM;
 977
 978         /*
 979          * First allocate the TX rings.
 980          */
 981         txring_for_each(rt2x00dev, ring) {
 982                 if (rt2x00lib_alloc_entries(ring, TX_ENTRIES, DATA_FRAME_SIZE,
 983                                             rt2x00dev->ops->txd_size))
 984                         return -ENOMEM;
 985         }
 986
 987         if (!test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
 988                 return 0;
 989
 990         /*
 991          * Allocate the BEACON ring.
 992          */
 993         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[0], BEACON_ENTRIES,
 994                                     MGMT_FRAME_SIZE, rt2x00dev->ops->txd_size))
 995                 return -ENOMEM;
 996
 997         /*
 998          * Allocate the Atim ring.
 999          */
1000         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[1], ATIM_ENTRIES,
1001                                     DATA_FRAME_SIZE, rt2x00dev->ops->txd_size))
1002                 return -ENOMEM;
1003
1004         return 0;
1005 }
1006
1007 static void rt2x00lib_free_ring_entries(struct rt2x00_dev *rt2x00dev)
1008 {
1009         struct data_ring *ring;
1010
1011         ring_for_each(rt2x00dev, ring) {
1012                 kfree(ring->entry);
1013                 ring->entry = NULL;
1014         }
1015 }
1016
1017 void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
1018 {
1019         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1020                 return;
1021
1022         /*
1023          * Unregister rfkill.
1024          */
1025         rt2x00rfkill_unregister(rt2x00dev);
1026
1027         /*
1028          * Allow the HW to uninitialize.
1029          */
1030         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1031
1032         /*
1033          * Free allocated ring entries.
1034          */
1035         rt2x00lib_free_ring_entries(rt2x00dev);
1036 }
1037
1038 int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1039 {
1040         int status;
1041
1042         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1043                 return 0;
1044
1045         /*
1046          * Allocate all ring entries.
1047          */
1048         status = rt2x00lib_alloc_ring_entries(rt2x00dev);
1049         if (status) {
1050                 ERROR(rt2x00dev, "Ring entries allocation failed.\n");
1051                 return status;
1052         }
1053
1054         /*
1055          * Initialize the device.
1056          */
1057         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1058         if (status)
1059                 goto exit;
1060
1061         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
1062
1063         /*
1064          * Register the rfkill handler.
1065          */
1066         status = rt2x00rfkill_register(rt2x00dev);
1067         if (status)
1068                 goto exit_unitialize;
1069
1070         return 0;
1071
1072 exit_unitialize:
1073         rt2x00lib_uninitialize(rt2x00dev);
1074
1075 exit:
1076         rt2x00lib_free_ring_entries(rt2x00dev);
1077
1078         return status;
1079 }
1080
1081 /*
1082  * driver allocation handlers.
1083  */
1084 static int rt2x00lib_alloc_rings(struct rt2x00_dev *rt2x00dev)
1085 {
1086         struct data_ring *ring;
1087
1088         /*
1089          * We need the following rings:
1090          * RX: 1
1091          * TX: hw->queues
1092          * Beacon: 1 (if required)
1093          * Atim: 1 (if required)
1094          */
1095         rt2x00dev->data_rings = 1 + rt2x00dev->hw->queues +
1096             (2 * test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags));
1097
1098         ring = kzalloc(rt2x00dev->data_rings * sizeof(*ring), GFP_KERNEL);
1099         if (!ring) {
1100                 ERROR(rt2x00dev, "Ring allocation failed.\n");
1101                 return -ENOMEM;
1102         }
1103
1104         /*
1105          * Initialize pointers
1106          */
1107         rt2x00dev->rx = ring;
1108         rt2x00dev->tx = &rt2x00dev->rx[1];
1109         if (test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
1110                 rt2x00dev->bcn = &rt2x00dev->tx[rt2x00dev->hw->queues];
1111
1112         /*
1113          * Initialize ring parameters.
1114          * cw_min: 2^5 = 32.
1115          * cw_max: 2^10 = 1024.
1116          */
1117         ring_for_each(rt2x00dev, ring) {
1118                 ring->rt2x00dev = rt2x00dev;
1119                 ring->tx_params.aifs = 2;
1120                 ring->tx_params.cw_min = 5;
1121                 ring->tx_params.cw_max = 10;
1122         }
1123
1124         return 0;
1125 }
1126
1127 static void rt2x00lib_free_rings(struct rt2x00_dev *rt2x00dev)
1128 {
1129         kfree(rt2x00dev->rx);
1130         rt2x00dev->rx = NULL;
1131         rt2x00dev->tx = NULL;
1132         rt2x00dev->bcn = NULL;
1133 }
1134
1135 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1136 {
1137         int retval = -ENOMEM;
1138
1139         /*
1140          * Let the driver probe the device to detect the capabilities.
1141          */
1142         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1143         if (retval) {
1144                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1145                 goto exit;
1146         }
1147
1148         /*
1149          * Initialize configuration work.
1150          */
1151         INIT_WORK(&rt2x00dev->beacon_work, rt2x00lib_beacondone_scheduled);
1152         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
1153         INIT_WORK(&rt2x00dev->config_work, rt2x00lib_configuration_scheduled);
1154         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
1155
1156         /*
1157          * Reset current working type.
1158          */
1159         rt2x00dev->interface.type = INVALID_INTERFACE;
1160
1161         /*
1162          * Allocate ring array.
1163          */
1164         retval = rt2x00lib_alloc_rings(rt2x00dev);
1165         if (retval)
1166                 goto exit;
1167
1168         /*
1169          * Initialize ieee80211 structure.
1170          */
1171         retval = rt2x00lib_probe_hw(rt2x00dev);
1172         if (retval) {
1173                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1174                 goto exit;
1175         }
1176
1177         /*
1178          * Allocatie rfkill.
1179          */
1180         retval = rt2x00rfkill_allocate(rt2x00dev);
1181         if (retval)
1182                 goto exit;
1183
1184         /*
1185          * Open the debugfs entry.
1186          */
1187         rt2x00debug_register(rt2x00dev);
1188
1189         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1190
1191         return 0;
1192
1193 exit:
1194         rt2x00lib_remove_dev(rt2x00dev);
1195
1196         return retval;
1197 }
1198 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1199
1200 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1201 {
1202         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1203
1204         /*
1205          * Disable radio.
1206          */
1207         rt2x00lib_disable_radio(rt2x00dev);
1208
1209         /*
1210          * Uninitialize device.
1211          */
1212         rt2x00lib_uninitialize(rt2x00dev);
1213
1214         /*
1215          * Close debugfs entry.
1216          */
1217         rt2x00debug_deregister(rt2x00dev);
1218
1219         /*
1220          * Free rfkill
1221          */
1222         rt2x00rfkill_free(rt2x00dev);
1223
1224         /*
1225          * Free ieee80211_hw memory.
1226          */
1227         rt2x00lib_remove_hw(rt2x00dev);
1228
1229         /*
1230          * Free firmware image.
1231          */
1232         rt2x00lib_free_firmware(rt2x00dev);
1233
1234         /*
1235          * Free ring structures.
1236          */
1237         rt2x00lib_free_rings(rt2x00dev);
1238 }
1239 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1240
1241 /*
1242  * Device state handlers
1243  */
1244 #ifdef CONFIG_PM
1245 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1246 {
1247         int retval;
1248
1249         NOTICE(rt2x00dev, "Going to sleep.\n");
1250         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1251
1252         /*
1253          * Only continue if mac80211 has open interfaces.
1254          */
1255         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1256                 goto exit;
1257         __set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
1258
1259         /*
1260          * Disable radio and unitialize all items
1261          * that must be recreated on resume.
1262          */
1263         rt2x00mac_stop(rt2x00dev->hw);
1264         rt2x00lib_uninitialize(rt2x00dev);
1265         rt2x00debug_deregister(rt2x00dev);
1266
1267 exit:
1268         /*
1269          * Set device mode to sleep for power management.
1270          */
1271         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1272         if (retval)
1273                 return retval;
1274
1275         return 0;
1276 }
1277 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1278
1279 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1280 {
1281         struct interface *intf = &rt2x00dev->interface;
1282         int retval;
1283
1284         NOTICE(rt2x00dev, "Waking up.\n");
1285         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1286
1287         /*
1288          * Open the debugfs entry.
1289          */
1290         rt2x00debug_register(rt2x00dev);
1291
1292         /*
1293          * Only continue if mac80211 had open interfaces.
1294          */
1295         if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
1296                 return 0;
1297
1298         /*
1299          * Reinitialize device and all active interfaces.
1300          */
1301         retval = rt2x00mac_start(rt2x00dev->hw);
1302         if (retval)
1303                 goto exit;
1304
1305         /*
1306          * Reconfigure device.
1307          */
1308         rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
1309         if (!rt2x00dev->hw->conf.radio_enabled)
1310                 rt2x00lib_disable_radio(rt2x00dev);
1311
1312         rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
1313         rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
1314         rt2x00lib_config_type(rt2x00dev, intf->type);
1315
1316         /*
1317          * It is possible that during that mac80211 has attempted
1318          * to send frames while we were suspending or resuming.
1319          * In that case we have disabled the TX queue and should
1320          * now enable it again
1321          */
1322         ieee80211_start_queues(rt2x00dev->hw);
1323
1324         /*
1325          * When in Master or Ad-hoc mode,
1326          * restart Beacon transmitting by faking a beacondone event.
1327          */
1328         if (intf->type == IEEE80211_IF_TYPE_AP ||
1329             intf->type == IEEE80211_IF_TYPE_IBSS)
1330                 rt2x00lib_beacondone(rt2x00dev);
1331
1332         return 0;
1333
1334 exit:
1335         rt2x00lib_disable_radio(rt2x00dev);
1336         rt2x00lib_uninitialize(rt2x00dev);
1337         rt2x00debug_deregister(rt2x00dev);
1338
1339         return retval;
1340 }
1341 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1342 #endif /* CONFIG_PM */
1343
1344 /*
1345  * rt2x00lib module information.
1346  */
1347 MODULE_AUTHOR(DRV_PROJECT);
1348 MODULE_VERSION(DRV_VERSION);
1349 MODULE_DESCRIPTION("rt2x00 library");
1350 MODULE_LICENSE("GPL");