git.oblomov.eu 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 /*
  27  * Set enviroment defines for rt2x00.h
  28  */
  29 #define DRV_NAME "rt2x00lib"
  30
  31 #include <linux/kernel.h>
  32 #include <linux/module.h>
  33
  34 #include "rt2x00.h"
  35 #include "rt2x00lib.h"
  36
  37 /*
  38  * Ring handler.
  39  */
  40 struct data_ring *rt2x00lib_get_ring(struct rt2x00_dev *rt2x00dev,
  41                                      const unsigned int queue)
  42 {
  43         int beacon = test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags);
  44
  45         /*
  46          * Check if we are requesting a reqular TX ring,
  47          * or if we are requesting a Beacon or Atim ring.
  48          * For Atim rings, we should check if it is supported.
  49          */
  50         if (queue < rt2x00dev->hw->queues && rt2x00dev->tx)
  51                 return &rt2x00dev->tx[queue];
  52
  53         if (!rt2x00dev->bcn || !beacon)
  54                 return NULL;
  55
  56         if (queue == IEEE80211_TX_QUEUE_BEACON)
  57                 return &rt2x00dev->bcn[0];
  58         else if (queue == IEEE80211_TX_QUEUE_AFTER_BEACON)
  59                 return &rt2x00dev->bcn[1];
  60
  61         return NULL;
  62 }
  63 EXPORT_SYMBOL_GPL(rt2x00lib_get_ring);
  64
  65 /*
  66  * Link tuning handlers
  67  */
  68 static void rt2x00lib_start_link_tuner(struct rt2x00_dev *rt2x00dev)
  69 {
  70         rt2x00dev->link.count = 0;
  71         rt2x00dev->link.vgc_level = 0;
  72
  73         memset(&rt2x00dev->link.qual, 0, sizeof(rt2x00dev->link.qual));
  74
  75         /*
  76          * The RX and TX percentage should start at 50%
  77          * this will assure we will get at least get some
  78          * decent value when the link tuner starts.
  79          * The value will be dropped and overwritten with
  80          * the correct (measured )value anyway during the
  81          * first run of the link tuner.
  82          */
  83         rt2x00dev->link.qual.rx_percentage = 50;
  84         rt2x00dev->link.qual.tx_percentage = 50;
  85
  86         /*
  87          * Reset the link tuner.
  88          */
  89         rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
  90
  91         queue_delayed_work(rt2x00dev->hw->workqueue,
  92                            &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
  93 }
  94
  95 static void rt2x00lib_stop_link_tuner(struct rt2x00_dev *rt2x00dev)
  96 {
  97         cancel_delayed_work_sync(&rt2x00dev->link.work);
  98 }
  99
 100 void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
 101 {
 102         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 103                 return;
 104
 105         rt2x00lib_stop_link_tuner(rt2x00dev);
 106         rt2x00lib_start_link_tuner(rt2x00dev);
 107 }
 108
 109 /*
 110  * Radio control handlers.
 111  */
 112 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
 113 {
 114         int status;
 115
 116         /*
 117          * Don't enable the radio twice.
 118          * And check if the hardware button has been disabled.
 119          */
 120         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 121             test_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags))
 122                 return 0;
 123
 124         /*
 125          * Enable radio.
 126          */
 127         status = rt2x00dev->ops->lib->set_device_state(rt2x00dev,
 128                                                        STATE_RADIO_ON);
 129         if (status)
 130                 return status;
 131
 132         __set_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags);
 133
 134         /*
 135          * Enable RX.
 136          */
 137         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 138
 139         /*
 140          * Start the TX queues.
 141          */
 142         ieee80211_start_queues(rt2x00dev->hw);
 143
 144         return 0;
 145 }
 146
 147 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
 148 {
 149         if (!__test_and_clear_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 150                 return;
 151
 152         /*
 153          * Stop all scheduled work.
 154          */
 155         if (work_pending(&rt2x00dev->beacon_work))
 156                 cancel_work_sync(&rt2x00dev->beacon_work);
 157         if (work_pending(&rt2x00dev->filter_work))
 158                 cancel_work_sync(&rt2x00dev->filter_work);
 159         if (work_pending(&rt2x00dev->config_work))
 160                 cancel_work_sync(&rt2x00dev->config_work);
 161
 162         /*
 163          * Stop the TX queues.
 164          */
 165         ieee80211_stop_queues(rt2x00dev->hw);
 166
 167         /*
 168          * Disable RX.
 169          */
 170         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 171
 172         /*
 173          * Disable radio.
 174          */
 175         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 176 }
 177
 178 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 179 {
 180         /*
 181          * When we are disabling the RX, we should also stop the link tuner.
 182          */
 183         if (state == STATE_RADIO_RX_OFF)
 184                 rt2x00lib_stop_link_tuner(rt2x00dev);
 185
 186         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 187
 188         /*
 189          * When we are enabling the RX, we should also start the link tuner.
 190          */
 191         if (state == STATE_RADIO_RX_ON &&
 192             is_interface_present(&rt2x00dev->interface))
 193                 rt2x00lib_start_link_tuner(rt2x00dev);
 194 }
 195
 196 static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev *rt2x00dev)
 197 {
 198         enum antenna rx = rt2x00dev->link.ant.active.rx;
 199         enum antenna tx = rt2x00dev->link.ant.active.tx;
 200         int sample_a =
 201             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_A);
 202         int sample_b =
 203             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_B);
 204
 205         /*
 206          * We are done sampling. Now we should evaluate the results.
 207          */
 208         rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
 209
 210         /*
 211          * During the last period we have sampled the RSSI
 212          * from both antenna's. It now is time to determine
 213          * which antenna demonstrated the best performance.
 214          * When we are already on the antenna with the best
 215          * performance, then there really is nothing for us
 216          * left to do.
 217          */
 218         if (sample_a == sample_b)
 219                 return;
 220
 221         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) {
 222                 if (sample_a > sample_b && rx == ANTENNA_B)
 223                         rx = ANTENNA_A;
 224                 else if (rx == ANTENNA_A)
 225                         rx = ANTENNA_B;
 226         }
 227
 228         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY) {
 229                 if (sample_a > sample_b && tx == ANTENNA_B)
 230                         tx = ANTENNA_A;
 231                 else if (tx == ANTENNA_A)
 232                         tx = ANTENNA_B;
 233         }
 234
 235         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 236 }
 237
 238 static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
 239 {
 240         enum antenna rx = rt2x00dev->link.ant.active.rx;
 241         enum antenna tx = rt2x00dev->link.ant.active.tx;
 242         int rssi_curr = rt2x00_get_link_ant_rssi(&rt2x00dev->link);
 243         int rssi_old = rt2x00_update_ant_rssi(&rt2x00dev->link, rssi_curr);
 244
 245         /*
 246          * Legacy driver indicates that we should swap antenna's
 247          * when the difference in RSSI is greater that 5. This
 248          * also should be done when the RSSI was actually better
 249          * then the previous sample.
 250          * When the difference exceeds the threshold we should
 251          * sample the rssi from the other antenna to make a valid
 252          * comparison between the 2 antennas.
 253          */
 254         if ((rssi_curr - rssi_old) > -5 || (rssi_curr - rssi_old) < 5)
 255                 return;
 256
 257         rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;
 258
 259         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 260                 rx = (rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 261
 262         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 263                 tx = (tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 264
 265         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 266 }
 267
 268 static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
 269 {
 270         /*
 271          * Determine if software diversity is enabled for
 272          * either the TX or RX antenna (or both).
 273          * Always perform this check since within the link
 274          * tuner interval the configuration might have changed.
 275          */
 276         rt2x00dev->link.ant.flags &= ~ANTENNA_RX_DIVERSITY;
 277         rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;
 278
 279         if (rt2x00dev->hw->conf.antenna_sel_rx == 0 &&
 280             rt2x00dev->default_ant.rx != ANTENNA_SW_DIVERSITY)
 281                 rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
 282         if (rt2x00dev->hw->conf.antenna_sel_tx == 0 &&
 283             rt2x00dev->default_ant.tx != ANTENNA_SW_DIVERSITY)
 284                 rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;
 285
 286         if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&
 287             !(rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)) {
 288                 rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
 289                 return;
 290         }
 291
 292         /*
 293          * If we have only sampled the data over the last period
 294          * we should now harvest the data. Otherwise just evaluate
 295          * the data. The latter should only be performed once
 296          * every 2 seconds.
 297          */
 298         if (rt2x00dev->link.ant.flags & ANTENNA_MODE_SAMPLE)
 299                 rt2x00lib_evaluate_antenna_sample(rt2x00dev);
 300         else if (rt2x00dev->link.count & 1)
 301                 rt2x00lib_evaluate_antenna_eval(rt2x00dev);
 302 }
 303
 304 static void rt2x00lib_update_link_stats(struct link *link, int rssi)
 305 {
 306         int avg_rssi = rssi;
 307
 308         /*
 309          * Update global RSSI
 310          */
 311         if (link->qual.avg_rssi)
 312                 avg_rssi = MOVING_AVERAGE(link->qual.avg_rssi, rssi, 8);
 313         link->qual.avg_rssi = avg_rssi;
 314
 315         /*
 316          * Update antenna RSSI
 317          */
 318         if (link->ant.rssi_ant)
 319                 rssi = MOVING_AVERAGE(link->ant.rssi_ant, rssi, 8);
 320         link->ant.rssi_ant = rssi;
 321 }
 322
 323 static void rt2x00lib_precalculate_link_signal(struct link_qual *qual)
 324 {
 325         if (qual->rx_failed || qual->rx_success)
 326                 qual->rx_percentage =
 327                     (qual->rx_success * 100) /
 328                     (qual->rx_failed + qual->rx_success);
 329         else
 330                 qual->rx_percentage = 50;
 331
 332         if (qual->tx_failed || qual->tx_success)
 333                 qual->tx_percentage =
 334                     (qual->tx_success * 100) /
 335                     (qual->tx_failed + qual->tx_success);
 336         else
 337                 qual->tx_percentage = 50;
 338
 339         qual->rx_success = 0;
 340         qual->rx_failed = 0;
 341         qual->tx_success = 0;
 342         qual->tx_failed = 0;
 343 }
 344
 345 static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
 346                                            int rssi)
 347 {
 348         int rssi_percentage = 0;
 349         int signal;
 350
 351         /*
 352          * We need a positive value for the RSSI.
 353          */
 354         if (rssi < 0)
 355                 rssi += rt2x00dev->rssi_offset;
 356
 357         /*
 358          * Calculate the different percentages,
 359          * which will be used for the signal.
 360          */
 361         if (rt2x00dev->rssi_offset)
 362                 rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
 363
 364         /*
 365          * Add the individual percentages and use the WEIGHT
 366          * defines to calculate the current link signal.
 367          */
 368         signal = ((WEIGHT_RSSI * rssi_percentage) +
 369                   (WEIGHT_TX * rt2x00dev->link.qual.tx_percentage) +
 370                   (WEIGHT_RX * rt2x00dev->link.qual.rx_percentage)) / 100;
 371
 372         return (signal > 100) ? 100 : signal;
 373 }
 374
 375 static void rt2x00lib_link_tuner(struct work_struct *work)
 376 {
 377         struct rt2x00_dev *rt2x00dev =
 378             container_of(work, struct rt2x00_dev, link.work.work);
 379
 380         /*
 381          * When the radio is shutting down we should
 382          * immediately cease all link tuning.
 383          */
 384         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 385                 return;
 386
 387         /*
 388          * Update statistics.
 389          */
 390         rt2x00dev->ops->lib->link_stats(rt2x00dev, &rt2x00dev->link.qual);
 391         rt2x00dev->low_level_stats.dot11FCSErrorCount +=
 392             rt2x00dev->link.qual.rx_failed;
 393
 394         /*
 395          * Only perform the link tuning when Link tuning
 396          * has been enabled (This could have been disabled from the EEPROM).
 397          */
 398         if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
 399                 rt2x00dev->ops->lib->link_tuner(rt2x00dev);
 400
 401         /*
 402          * Evaluate antenna setup.
 403          */
 404         rt2x00lib_evaluate_antenna(rt2x00dev);
 405
 406         /*
 407          * Precalculate a portion of the link signal which is
 408          * in based on the tx/rx success/failure counters.
 409          */
 410         rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
 411
 412         /*
 413          * Increase tuner counter, and reschedule the next link tuner run.
 414          */
 415         rt2x00dev->link.count++;
 416         queue_delayed_work(rt2x00dev->hw->workqueue, &rt2x00dev->link.work,
 417                            LINK_TUNE_INTERVAL);
 418 }
 419
 420 static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
 421 {
 422         struct rt2x00_dev *rt2x00dev =
 423             container_of(work, struct rt2x00_dev, filter_work);
 424         unsigned int filter = rt2x00dev->interface.filter;
 425
 426         /*
 427          * Since we had stored the filter inside interface.filter,
 428          * we should now clear that field. Otherwise the driver will
 429          * assume nothing has changed (*total_flags will be compared
 430          * to interface.filter to determine if any action is required).
 431          */
 432         rt2x00dev->interface.filter = 0;
 433
 434         rt2x00dev->ops->hw->configure_filter(rt2x00dev->hw,
 435                                              filter, &filter, 0, NULL);
 436 }
 437
 438 static void rt2x00lib_configuration_scheduled(struct work_struct *work)
 439 {
 440         struct rt2x00_dev *rt2x00dev =
 441             container_of(work, struct rt2x00_dev, config_work);
 442         int preamble = !test_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
 443
 444         rt2x00mac_erp_ie_changed(rt2x00dev->hw,
 445                                  IEEE80211_ERP_CHANGE_PREAMBLE, 0, preamble);
 446 }
 447
 448 /*
 449  * Interrupt context handlers.
 450  */
 451 static void rt2x00lib_beacondone_scheduled(struct work_struct *work)
 452 {
 453         struct rt2x00_dev *rt2x00dev =
 454             container_of(work, struct rt2x00_dev, beacon_work);
 455         struct data_ring *ring =
 456             rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
 457         struct data_entry *entry = rt2x00_get_data_entry(ring);
 458         struct sk_buff *skb;
 459
 460         skb = ieee80211_beacon_get(rt2x00dev->hw,
 461                                    rt2x00dev->interface.id,
 462                                    &entry->tx_status.control);
 463         if (!skb)
 464                 return;
 465
 466         rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, skb,
 467                                           &entry->tx_status.control);
 468
 469         dev_kfree_skb(skb);
 470 }
 471
 472 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 473 {
 474         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 475                 return;
 476
 477         queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->beacon_work);
 478 }
 479 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 480
 481 void rt2x00lib_txdone(struct data_entry *entry,
 482                       const int status, const int retry)
 483 {
 484         struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
 485         struct ieee80211_tx_status *tx_status = &entry->tx_status;
 486         struct ieee80211_low_level_stats *stats = &rt2x00dev->low_level_stats;
 487         int success = !!(status == TX_SUCCESS || status == TX_SUCCESS_RETRY);
 488         int fail = !!(status == TX_FAIL_RETRY || status == TX_FAIL_INVALID ||
 489                       status == TX_FAIL_OTHER);
 490
 491         /*
 492          * Update TX statistics.
 493          */
 494         tx_status->flags = 0;
 495         tx_status->ack_signal = 0;
 496         tx_status->excessive_retries = (status == TX_FAIL_RETRY);
 497         tx_status->retry_count = retry;
 498         rt2x00dev->link.qual.tx_success += success;
 499         rt2x00dev->link.qual.tx_failed += retry + fail;
 500
 501         if (!(tx_status->control.flags & IEEE80211_TXCTL_NO_ACK)) {
 502                 if (success)
 503                         tx_status->flags |= IEEE80211_TX_STATUS_ACK;
 504                 else
 505                         stats->dot11ACKFailureCount++;
 506         }
 507
 508         tx_status->queue_length = entry->ring->stats.limit;
 509         tx_status->queue_number = tx_status->control.queue;
 510
 511         if (tx_status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) {
 512                 if (success)
 513                         stats->dot11RTSSuccessCount++;
 514                 else
 515                         stats->dot11RTSFailureCount++;
 516         }
 517
 518         /*
 519          * Send the tx_status to mac80211,
 520          * that method also cleans up the skb structure.
 521          */
 522         ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb, tx_status);
 523         entry->skb = NULL;
 524 }
 525 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 526
 527 void rt2x00lib_rxdone(struct data_entry *entry, struct sk_buff *skb,
 528                       struct rxdata_entry_desc *desc)
 529 {
 530         struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
 531         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 532         struct ieee80211_hw_mode *mode;
 533         struct ieee80211_rate *rate;
 534         unsigned int i;
 535         int val = 0;
 536
 537         /*
 538          * Update RX statistics.
 539          */
 540         mode = &rt2x00dev->hwmodes[rt2x00dev->curr_hwmode];
 541         for (i = 0; i < mode->num_rates; i++) {
 542                 rate = &mode->rates[i];
 543
 544                 /*
 545                  * When frame was received with an OFDM bitrate,
 546                  * the signal is the PLCP value. If it was received with
 547                  * a CCK bitrate the signal is the rate in 0.5kbit/s.
 548                  */
 549                 if (!desc->ofdm)
 550                         val = DEVICE_GET_RATE_FIELD(rate->val, RATE);
 551                 else
 552                         val = DEVICE_GET_RATE_FIELD(rate->val, PLCP);
 553
 554                 if (val == desc->signal) {
 555                         val = rate->val;
 556                         break;
 557                 }
 558         }
 559
 560         rt2x00lib_update_link_stats(&rt2x00dev->link, desc->rssi);
 561         rt2x00dev->link.qual.rx_success++;
 562
 563         rx_status->rate = val;
 564         rx_status->signal =
 565             rt2x00lib_calculate_link_signal(rt2x00dev, desc->rssi);
 566         rx_status->ssi = desc->rssi;
 567         rx_status->flag = desc->flags;
 568         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 569
 570         /*
 571          * Send frame to mac80211
 572          */
 573         ieee80211_rx_irqsafe(rt2x00dev->hw, skb, rx_status);
 574 }
 575 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 576
 577 /*
 578  * TX descriptor initializer
 579  */
 580 void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 581                              __le32 *txd,
 582                              struct ieee80211_hdr *ieee80211hdr,
 583                              unsigned int length,
 584                              struct ieee80211_tx_control *control)
 585 {
 586         struct txdata_entry_desc desc;
 587         struct data_ring *ring;
 588         int tx_rate;
 589         int bitrate;
 590         int duration;
 591         int residual;
 592         u16 frame_control;
 593         u16 seq_ctrl;
 594
 595         /*
 596          * Make sure the descriptor is properly cleared.
 597          */
 598         memset(&desc, 0x00, sizeof(desc));
 599
 600         /*
 601          * Get ring pointer, if we fail to obtain the
 602          * correct ring, then use the first TX ring.
 603          */
 604         ring = rt2x00lib_get_ring(rt2x00dev, control->queue);
 605         if (!ring)
 606                 ring = rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_DATA0);
 607
 608         desc.cw_min = ring->tx_params.cw_min;
 609         desc.cw_max = ring->tx_params.cw_max;
 610         desc.aifs = ring->tx_params.aifs;
 611
 612         /*
 613          * Identify queue
 614          */
 615         if (control->queue < rt2x00dev->hw->queues)
 616                 desc.queue = control->queue;
 617         else if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 618                  control->queue == IEEE80211_TX_QUEUE_AFTER_BEACON)
 619                 desc.queue = QUEUE_MGMT;
 620         else
 621                 desc.queue = QUEUE_OTHER;
 622
 623         /*
 624          * Read required fields from ieee80211 header.
 625          */
 626         frame_control = le16_to_cpu(ieee80211hdr->frame_control);
 627         seq_ctrl = le16_to_cpu(ieee80211hdr->seq_ctrl);
 628
 629         tx_rate = control->tx_rate;
 630
 631         /*
 632          * Check whether this frame is to be acked
 633          */
 634         if (!(control->flags & IEEE80211_TXCTL_NO_ACK))
 635                 __set_bit(ENTRY_TXD_ACK, &desc.flags);
 636
 637         /*
 638          * Check if this is a RTS/CTS frame
 639          */
 640         if (is_rts_frame(frame_control) || is_cts_frame(frame_control)) {
 641                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 642                 if (is_rts_frame(frame_control)) {
 643                         __set_bit(ENTRY_TXD_RTS_FRAME, &desc.flags);
 644                         __set_bit(ENTRY_TXD_ACK, &desc.flags);
 645                 } else
 646                         __clear_bit(ENTRY_TXD_ACK, &desc.flags);
 647                 if (control->rts_cts_rate)
 648                         tx_rate = control->rts_cts_rate;
 649         }
 650
 651         /*
 652          * Check for OFDM
 653          */
 654         if (DEVICE_GET_RATE_FIELD(tx_rate, RATEMASK) & DEV_OFDM_RATEMASK)
 655                 __set_bit(ENTRY_TXD_OFDM_RATE, &desc.flags);
 656
 657         /*
 658          * Check if more fragments are pending
 659          */
 660         if (ieee80211_get_morefrag(ieee80211hdr)) {
 661                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 662                 __set_bit(ENTRY_TXD_MORE_FRAG, &desc.flags);
 663         }
 664
 665         /*
 666          * Beacons and probe responses require the tsf timestamp
 667          * to be inserted into the frame.
 668          */
 669         if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 670             is_probe_resp(frame_control))
 671                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &desc.flags);
 672
 673         /*
 674          * Determine with what IFS priority this frame should be send.
 675          * Set ifs to IFS_SIFS when the this is not the first fragment,
 676          * or this fragment came after RTS/CTS.
 677          */
 678         if ((seq_ctrl & IEEE80211_SCTL_FRAG) > 0 ||
 679             test_bit(ENTRY_TXD_RTS_FRAME, &desc.flags))
 680                 desc.ifs = IFS_SIFS;
 681         else
 682                 desc.ifs = IFS_BACKOFF;
 683
 684         /*
 685          * PLCP setup
 686          * Length calculation depends on OFDM/CCK rate.
 687          */
 688         desc.signal = DEVICE_GET_RATE_FIELD(tx_rate, PLCP);
 689         desc.service = 0x04;
 690
 691         if (test_bit(ENTRY_TXD_OFDM_RATE, &desc.flags)) {
 692                 desc.length_high = ((length + FCS_LEN) >> 6) & 0x3f;
 693                 desc.length_low = ((length + FCS_LEN) & 0x3f);
 694         } else {
 695                 bitrate = DEVICE_GET_RATE_FIELD(tx_rate, RATE);
 696
 697                 /*
 698                  * Convert length to microseconds.
 699                  */
 700                 residual = get_duration_res(length + FCS_LEN, bitrate);
 701                 duration = get_duration(length + FCS_LEN, bitrate);
 702
 703                 if (residual != 0) {
 704                         duration++;
 705
 706                         /*
 707                          * Check if we need to set the Length Extension
 708                          */
 709                         if (bitrate == 110 && residual <= 30)
 710                                 desc.service |= 0x80;
 711                 }
 712
 713                 desc.length_high = (duration >> 8) & 0xff;
 714                 desc.length_low = duration & 0xff;
 715
 716                 /*
 717                  * When preamble is enabled we should set the
 718                  * preamble bit for the signal.
 719                  */
 720                 if (DEVICE_GET_RATE_FIELD(tx_rate, PREAMBLE))
 721                         desc.signal |= 0x08;
 722         }
 723
 724         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, txd, &desc,
 725                                            ieee80211hdr, length, control);
 726 }
 727 EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc);
 728
 729 /*
 730  * Driver initialization handlers.
 731  */
 732 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 733                               const int channel, const int tx_power,
 734                               const int value)
 735 {
 736         entry->chan = channel;
 737         if (channel <= 14)
 738                 entry->freq = 2407 + (5 * channel);
 739         else
 740                 entry->freq = 5000 + (5 * channel);
 741         entry->val = value;
 742         entry->flag =
 743             IEEE80211_CHAN_W_IBSS |
 744             IEEE80211_CHAN_W_ACTIVE_SCAN |
 745             IEEE80211_CHAN_W_SCAN;
 746         entry->power_level = tx_power;
 747         entry->antenna_max = 0xff;
 748 }
 749
 750 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 751                            const int rate, const int mask,
 752                            const int plcp, const int flags)
 753 {
 754         entry->rate = rate;
 755         entry->val =
 756             DEVICE_SET_RATE_FIELD(rate, RATE) |
 757             DEVICE_SET_RATE_FIELD(mask, RATEMASK) |
 758             DEVICE_SET_RATE_FIELD(plcp, PLCP);
 759         entry->flags = flags;
 760         entry->val2 = entry->val;
 761         if (entry->flags & IEEE80211_RATE_PREAMBLE2)
 762                 entry->val2 |= DEVICE_SET_RATE_FIELD(1, PREAMBLE);
 763         entry->min_rssi_ack = 0;
 764         entry->min_rssi_ack_delta = 0;
 765 }
 766
 767 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 768                                     struct hw_mode_spec *spec)
 769 {
 770         struct ieee80211_hw *hw = rt2x00dev->hw;
 771         struct ieee80211_hw_mode *hwmodes;
 772         struct ieee80211_channel *channels;
 773         struct ieee80211_rate *rates;
 774         unsigned int i;
 775         unsigned char tx_power;
 776
 777         hwmodes = kzalloc(sizeof(*hwmodes) * spec->num_modes, GFP_KERNEL);
 778         if (!hwmodes)
 779                 goto exit;
 780
 781         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 782         if (!channels)
 783                 goto exit_free_modes;
 784
 785         rates = kzalloc(sizeof(*rates) * spec->num_rates, GFP_KERNEL);
 786         if (!rates)
 787                 goto exit_free_channels;
 788
 789         /*
 790          * Initialize Rate list.
 791          */
 792         rt2x00lib_rate(&rates[0], 10, DEV_RATEMASK_1MB,
 793                        0x00, IEEE80211_RATE_CCK);
 794         rt2x00lib_rate(&rates[1], 20, DEV_RATEMASK_2MB,
 795                        0x01, IEEE80211_RATE_CCK_2);
 796         rt2x00lib_rate(&rates[2], 55, DEV_RATEMASK_5_5MB,
 797                        0x02, IEEE80211_RATE_CCK_2);
 798         rt2x00lib_rate(&rates[3], 110, DEV_RATEMASK_11MB,
 799                        0x03, IEEE80211_RATE_CCK_2);
 800
 801         if (spec->num_rates > 4) {
 802                 rt2x00lib_rate(&rates[4], 60, DEV_RATEMASK_6MB,
 803                                0x0b, IEEE80211_RATE_OFDM);
 804                 rt2x00lib_rate(&rates[5], 90, DEV_RATEMASK_9MB,
 805                                0x0f, IEEE80211_RATE_OFDM);
 806                 rt2x00lib_rate(&rates[6], 120, DEV_RATEMASK_12MB,
 807                                0x0a, IEEE80211_RATE_OFDM);
 808                 rt2x00lib_rate(&rates[7], 180, DEV_RATEMASK_18MB,
 809                                0x0e, IEEE80211_RATE_OFDM);
 810                 rt2x00lib_rate(&rates[8], 240, DEV_RATEMASK_24MB,
 811                                0x09, IEEE80211_RATE_OFDM);
 812                 rt2x00lib_rate(&rates[9], 360, DEV_RATEMASK_36MB,
 813                                0x0d, IEEE80211_RATE_OFDM);
 814                 rt2x00lib_rate(&rates[10], 480, DEV_RATEMASK_48MB,
 815                                0x08, IEEE80211_RATE_OFDM);
 816                 rt2x00lib_rate(&rates[11], 540, DEV_RATEMASK_54MB,
 817                                0x0c, IEEE80211_RATE_OFDM);
 818         }
 819
 820         /*
 821          * Initialize Channel list.
 822          */
 823         for (i = 0; i < spec->num_channels; i++) {
 824                 if (spec->channels[i].channel <= 14)
 825                         tx_power = spec->tx_power_bg[i];
 826                 else if (spec->tx_power_a)
 827                         tx_power = spec->tx_power_a[i];
 828                 else
 829                         tx_power = spec->tx_power_default;
 830
 831                 rt2x00lib_channel(&channels[i],
 832                                   spec->channels[i].channel, tx_power, i);
 833         }
 834
 835         /*
 836          * Intitialize 802.11b
 837          * Rates: CCK.
 838          * Channels: OFDM.
 839          */
 840         if (spec->num_modes > HWMODE_B) {
 841                 hwmodes[HWMODE_B].mode = MODE_IEEE80211B;
 842                 hwmodes[HWMODE_B].num_channels = 14;
 843                 hwmodes[HWMODE_B].num_rates = 4;
 844                 hwmodes[HWMODE_B].channels = channels;
 845                 hwmodes[HWMODE_B].rates = rates;
 846         }
 847
 848         /*
 849          * Intitialize 802.11g
 850          * Rates: CCK, OFDM.
 851          * Channels: OFDM.
 852          */
 853         if (spec->num_modes > HWMODE_G) {
 854                 hwmodes[HWMODE_G].mode = MODE_IEEE80211G;
 855                 hwmodes[HWMODE_G].num_channels = 14;
 856                 hwmodes[HWMODE_G].num_rates = spec->num_rates;
 857                 hwmodes[HWMODE_G].channels = channels;
 858                 hwmodes[HWMODE_G].rates = rates;
 859         }
 860
 861         /*
 862          * Intitialize 802.11a
 863          * Rates: OFDM.
 864          * Channels: OFDM, UNII, HiperLAN2.
 865          */
 866         if (spec->num_modes > HWMODE_A) {
 867                 hwmodes[HWMODE_A].mode = MODE_IEEE80211A;
 868                 hwmodes[HWMODE_A].num_channels = spec->num_channels - 14;
 869                 hwmodes[HWMODE_A].num_rates = spec->num_rates - 4;
 870                 hwmodes[HWMODE_A].channels = &channels[14];
 871                 hwmodes[HWMODE_A].rates = &rates[4];
 872         }
 873
 874         if (spec->num_modes > HWMODE_G &&
 875             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_G]))
 876                 goto exit_free_rates;
 877
 878         if (spec->num_modes > HWMODE_B &&
 879             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_B]))
 880                 goto exit_free_rates;
 881
 882         if (spec->num_modes > HWMODE_A &&
 883             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_A]))
 884                 goto exit_free_rates;
 885
 886         rt2x00dev->hwmodes = hwmodes;
 887
 888         return 0;
 889
 890 exit_free_rates:
 891         kfree(rates);
 892
 893 exit_free_channels:
 894         kfree(channels);
 895
 896 exit_free_modes:
 897         kfree(hwmodes);
 898
 899 exit:
 900         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 901         return -ENOMEM;
 902 }
 903
 904 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 905 {
 906         if (test_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags))
 907                 ieee80211_unregister_hw(rt2x00dev->hw);
 908
 909         if (likely(rt2x00dev->hwmodes)) {
 910                 kfree(rt2x00dev->hwmodes->channels);
 911                 kfree(rt2x00dev->hwmodes->rates);
 912                 kfree(rt2x00dev->hwmodes);
 913                 rt2x00dev->hwmodes = NULL;
 914         }
 915 }
 916
 917 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 918 {
 919         struct hw_mode_spec *spec = &rt2x00dev->spec;
 920         int status;
 921
 922         /*
 923          * Initialize HW modes.
 924          */
 925         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 926         if (status)
 927                 return status;
 928
 929         /*
 930          * Register HW.
 931          */
 932         status = ieee80211_register_hw(rt2x00dev->hw);
 933         if (status) {
 934                 rt2x00lib_remove_hw(rt2x00dev);
 935                 return status;
 936         }
 937
 938         __set_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags);
 939
 940         return 0;
 941 }
 942
 943 /*
 944  * Initialization/uninitialization handlers.
 945  */
 946 static int rt2x00lib_alloc_entries(struct data_ring *ring,
 947                                    const u16 max_entries, const u16 data_size,
 948                                    const u16 desc_size)
 949 {
 950         struct data_entry *entry;
 951         unsigned int i;
 952
 953         ring->stats.limit = max_entries;
 954         ring->data_size = data_size;
 955         ring->desc_size = desc_size;
 956
 957         /*
 958          * Allocate all ring entries.
 959          */
 960         entry = kzalloc(ring->stats.limit * sizeof(*entry), GFP_KERNEL);
 961         if (!entry)
 962                 return -ENOMEM;
 963
 964         for (i = 0; i < ring->stats.limit; i++) {
 965                 entry[i].flags = 0;
 966                 entry[i].ring = ring;
 967                 entry[i].skb = NULL;
 968         }
 969
 970         ring->entry = entry;
 971
 972         return 0;
 973 }
 974
 975 static int rt2x00lib_alloc_ring_entries(struct rt2x00_dev *rt2x00dev)
 976 {
 977         struct data_ring *ring;
 978
 979         /*
 980          * Allocate the RX ring.
 981          */
 982         if (rt2x00lib_alloc_entries(rt2x00dev->rx, RX_ENTRIES, DATA_FRAME_SIZE,
 983                                     rt2x00dev->ops->rxd_size))
 984                 return -ENOMEM;
 985
 986         /*
 987          * First allocate the TX rings.
 988          */
 989         txring_for_each(rt2x00dev, ring) {
 990                 if (rt2x00lib_alloc_entries(ring, TX_ENTRIES, DATA_FRAME_SIZE,
 991                                             rt2x00dev->ops->txd_size))
 992                         return -ENOMEM;
 993         }
 994
 995         if (!test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
 996                 return 0;
 997
 998         /*
 999          * Allocate the BEACON ring.
1000          */
1001         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[0], BEACON_ENTRIES,
1002                                     MGMT_FRAME_SIZE, rt2x00dev->ops->txd_size))
1003                 return -ENOMEM;
1004
1005         /*
1006          * Allocate the Atim ring.
1007          */
1008         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[1], ATIM_ENTRIES,
1009                                     DATA_FRAME_SIZE, rt2x00dev->ops->txd_size))
1010                 return -ENOMEM;
1011
1012         return 0;
1013 }
1014
1015 static void rt2x00lib_free_ring_entries(struct rt2x00_dev *rt2x00dev)
1016 {
1017         struct data_ring *ring;
1018
1019         ring_for_each(rt2x00dev, ring) {
1020                 kfree(ring->entry);
1021                 ring->entry = NULL;
1022         }
1023 }
1024
1025 void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
1026 {
1027         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1028                 return;
1029
1030         /*
1031          * Unregister rfkill.
1032          */
1033         rt2x00rfkill_unregister(rt2x00dev);
1034
1035         /*
1036          * Allow the HW to uninitialize.
1037          */
1038         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1039
1040         /*
1041          * Free allocated ring entries.
1042          */
1043         rt2x00lib_free_ring_entries(rt2x00dev);
1044 }
1045
1046 int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1047 {
1048         int status;
1049
1050         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1051                 return 0;
1052
1053         /*
1054          * Allocate all ring entries.
1055          */
1056         status = rt2x00lib_alloc_ring_entries(rt2x00dev);
1057         if (status) {
1058                 ERROR(rt2x00dev, "Ring entries allocation failed.\n");
1059                 return status;
1060         }
1061
1062         /*
1063          * Initialize the device.
1064          */
1065         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1066         if (status)
1067                 goto exit;
1068
1069         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
1070
1071         /*
1072          * Register the rfkill handler.
1073          */
1074         status = rt2x00rfkill_register(rt2x00dev);
1075         if (status)
1076                 goto exit_unitialize;
1077
1078         return 0;
1079
1080 exit_unitialize:
1081         rt2x00lib_uninitialize(rt2x00dev);
1082
1083 exit:
1084         rt2x00lib_free_ring_entries(rt2x00dev);
1085
1086         return status;
1087 }
1088
1089 /*
1090  * driver allocation handlers.
1091  */
1092 static int rt2x00lib_alloc_rings(struct rt2x00_dev *rt2x00dev)
1093 {
1094         struct data_ring *ring;
1095
1096         /*
1097          * We need the following rings:
1098          * RX: 1
1099          * TX: hw->queues
1100          * Beacon: 1 (if required)
1101          * Atim: 1 (if required)
1102          */
1103         rt2x00dev->data_rings = 1 + rt2x00dev->hw->queues +
1104             (2 * test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags));
1105
1106         ring = kzalloc(rt2x00dev->data_rings * sizeof(*ring), GFP_KERNEL);
1107         if (!ring) {
1108                 ERROR(rt2x00dev, "Ring allocation failed.\n");
1109                 return -ENOMEM;
1110         }
1111
1112         /*
1113          * Initialize pointers
1114          */
1115         rt2x00dev->rx = ring;
1116         rt2x00dev->tx = &rt2x00dev->rx[1];
1117         if (test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
1118                 rt2x00dev->bcn = &rt2x00dev->tx[rt2x00dev->hw->queues];
1119
1120         /*
1121          * Initialize ring parameters.
1122          * cw_min: 2^5 = 32.
1123          * cw_max: 2^10 = 1024.
1124          */
1125         ring_for_each(rt2x00dev, ring) {
1126                 ring->rt2x00dev = rt2x00dev;
1127                 ring->tx_params.aifs = 2;
1128                 ring->tx_params.cw_min = 5;
1129                 ring->tx_params.cw_max = 10;
1130         }
1131
1132         return 0;
1133 }
1134
1135 static void rt2x00lib_free_rings(struct rt2x00_dev *rt2x00dev)
1136 {
1137         kfree(rt2x00dev->rx);
1138         rt2x00dev->rx = NULL;
1139         rt2x00dev->tx = NULL;
1140         rt2x00dev->bcn = NULL;
1141 }
1142
1143 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1144 {
1145         int retval = -ENOMEM;
1146
1147         /*
1148          * Let the driver probe the device to detect the capabilities.
1149          */
1150         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1151         if (retval) {
1152                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1153                 goto exit;
1154         }
1155
1156         /*
1157          * Initialize configuration work.
1158          */
1159         INIT_WORK(&rt2x00dev->beacon_work, rt2x00lib_beacondone_scheduled);
1160         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
1161         INIT_WORK(&rt2x00dev->config_work, rt2x00lib_configuration_scheduled);
1162         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
1163
1164         /*
1165          * Reset current working type.
1166          */
1167         rt2x00dev->interface.type = INVALID_INTERFACE;
1168
1169         /*
1170          * Allocate ring array.
1171          */
1172         retval = rt2x00lib_alloc_rings(rt2x00dev);
1173         if (retval)
1174                 goto exit;
1175
1176         /*
1177          * Initialize ieee80211 structure.
1178          */
1179         retval = rt2x00lib_probe_hw(rt2x00dev);
1180         if (retval) {
1181                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1182                 goto exit;
1183         }
1184
1185         /*
1186          * Allocatie rfkill.
1187          */
1188         retval = rt2x00rfkill_allocate(rt2x00dev);
1189         if (retval)
1190                 goto exit;
1191
1192         /*
1193          * Open the debugfs entry.
1194          */
1195         rt2x00debug_register(rt2x00dev);
1196
1197         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1198
1199         return 0;
1200
1201 exit:
1202         rt2x00lib_remove_dev(rt2x00dev);
1203
1204         return retval;
1205 }
1206 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1207
1208 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1209 {
1210         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1211
1212         /*
1213          * Disable radio.
1214          */
1215         rt2x00lib_disable_radio(rt2x00dev);
1216
1217         /*
1218          * Uninitialize device.
1219          */
1220         rt2x00lib_uninitialize(rt2x00dev);
1221
1222         /*
1223          * Close debugfs entry.
1224          */
1225         rt2x00debug_deregister(rt2x00dev);
1226
1227         /*
1228          * Free rfkill
1229          */
1230         rt2x00rfkill_free(rt2x00dev);
1231
1232         /*
1233          * Free ieee80211_hw memory.
1234          */
1235         rt2x00lib_remove_hw(rt2x00dev);
1236
1237         /*
1238          * Free firmware image.
1239          */
1240         rt2x00lib_free_firmware(rt2x00dev);
1241
1242         /*
1243          * Free ring structures.
1244          */
1245         rt2x00lib_free_rings(rt2x00dev);
1246 }
1247 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1248
1249 /*
1250  * Device state handlers
1251  */
1252 #ifdef CONFIG_PM
1253 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1254 {
1255         int retval;
1256
1257         NOTICE(rt2x00dev, "Going to sleep.\n");
1258         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1259
1260         /*
1261          * Only continue if mac80211 has open interfaces.
1262          */
1263         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1264                 goto exit;
1265         __set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
1266
1267         /*
1268          * Disable radio and unitialize all items
1269          * that must be recreated on resume.
1270          */
1271         rt2x00mac_stop(rt2x00dev->hw);
1272         rt2x00lib_uninitialize(rt2x00dev);
1273         rt2x00debug_deregister(rt2x00dev);
1274
1275 exit:
1276         /*
1277          * Set device mode to sleep for power management.
1278          */
1279         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1280         if (retval)
1281                 return retval;
1282
1283         return 0;
1284 }
1285 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1286
1287 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1288 {
1289         struct interface *intf = &rt2x00dev->interface;
1290         int retval;
1291
1292         NOTICE(rt2x00dev, "Waking up.\n");
1293         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1294
1295         /*
1296          * Open the debugfs entry.
1297          */
1298         rt2x00debug_register(rt2x00dev);
1299
1300         /*
1301          * Only continue if mac80211 had open interfaces.
1302          */
1303         if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
1304                 return 0;
1305
1306         /*
1307          * Reinitialize device and all active interfaces.
1308          */
1309         retval = rt2x00mac_start(rt2x00dev->hw);
1310         if (retval)
1311                 goto exit;
1312
1313         /*
1314          * Reconfigure device.
1315          */
1316         rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
1317         if (!rt2x00dev->hw->conf.radio_enabled)
1318                 rt2x00lib_disable_radio(rt2x00dev);
1319
1320         rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
1321         rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
1322         rt2x00lib_config_type(rt2x00dev, intf->type);
1323
1324         /*
1325          * It is possible that during that mac80211 has attempted
1326          * to send frames while we were suspending or resuming.
1327          * In that case we have disabled the TX queue and should
1328          * now enable it again
1329          */
1330         ieee80211_start_queues(rt2x00dev->hw);
1331
1332         /*
1333          * When in Master or Ad-hoc mode,
1334          * restart Beacon transmitting by faking a beacondone event.
1335          */
1336         if (intf->type == IEEE80211_IF_TYPE_AP ||
1337             intf->type == IEEE80211_IF_TYPE_IBSS)
1338                 rt2x00lib_beacondone(rt2x00dev);
1339
1340         return 0;
1341
1342 exit:
1343         rt2x00lib_disable_radio(rt2x00dev);
1344         rt2x00lib_uninitialize(rt2x00dev);
1345         rt2x00debug_deregister(rt2x00dev);
1346
1347         return retval;
1348 }
1349 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1350 #endif /* CONFIG_PM */
1351
1352 /*
1353  * rt2x00lib module information.
1354  */
1355 MODULE_AUTHOR(DRV_PROJECT);
1356 MODULE_VERSION(DRV_VERSION);
1357 MODULE_DESCRIPTION("rt2x00 library");
1358 MODULE_LICENSE("GPL");