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 #include "rt2x00dump.h"
  32
  33 /*
  34  * Ring handler.
  35  */
  36 struct data_ring *rt2x00lib_get_ring(struct rt2x00_dev *rt2x00dev,
  37                                      const unsigned int queue)
  38 {
  39         int beacon = test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags);
  40
  41         /*
  42          * Check if we are requesting a reqular TX ring,
  43          * or if we are requesting a Beacon or Atim ring.
  44          * For Atim rings, we should check if it is supported.
  45          */
  46         if (queue < rt2x00dev->hw->queues && rt2x00dev->tx)
  47                 return &rt2x00dev->tx[queue];
  48
  49         if (!rt2x00dev->bcn || !beacon)
  50                 return NULL;
  51
  52         if (queue == IEEE80211_TX_QUEUE_BEACON)
  53                 return &rt2x00dev->bcn[0];
  54         else if (queue == IEEE80211_TX_QUEUE_AFTER_BEACON)
  55                 return &rt2x00dev->bcn[1];
  56
  57         return NULL;
  58 }
  59 EXPORT_SYMBOL_GPL(rt2x00lib_get_ring);
  60
  61 /*
  62  * Link tuning handlers
  63  */
  64 static void rt2x00lib_start_link_tuner(struct rt2x00_dev *rt2x00dev)
  65 {
  66         rt2x00dev->link.count = 0;
  67         rt2x00dev->link.vgc_level = 0;
  68
  69         memset(&rt2x00dev->link.qual, 0, sizeof(rt2x00dev->link.qual));
  70
  71         /*
  72          * The RX and TX percentage should start at 50%
  73          * this will assure we will get at least get some
  74          * decent value when the link tuner starts.
  75          * The value will be dropped and overwritten with
  76          * the correct (measured )value anyway during the
  77          * first run of the link tuner.
  78          */
  79         rt2x00dev->link.qual.rx_percentage = 50;
  80         rt2x00dev->link.qual.tx_percentage = 50;
  81
  82         /*
  83          * Reset the link tuner.
  84          */
  85         rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
  86
  87         queue_delayed_work(rt2x00dev->hw->workqueue,
  88                            &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
  89 }
  90
  91 static void rt2x00lib_stop_link_tuner(struct rt2x00_dev *rt2x00dev)
  92 {
  93         cancel_delayed_work_sync(&rt2x00dev->link.work);
  94 }
  95
  96 void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
  97 {
  98         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
  99                 return;
 100
 101         rt2x00lib_stop_link_tuner(rt2x00dev);
 102         rt2x00lib_start_link_tuner(rt2x00dev);
 103 }
 104
 105 /*
 106  * Radio control handlers.
 107  */
 108 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
 109 {
 110         int status;
 111
 112         /*
 113          * Don't enable the radio twice.
 114          * And check if the hardware button has been disabled.
 115          */
 116         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 117             test_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags))
 118                 return 0;
 119
 120         /*
 121          * Enable radio.
 122          */
 123         status = rt2x00dev->ops->lib->set_device_state(rt2x00dev,
 124                                                        STATE_RADIO_ON);
 125         if (status)
 126                 return status;
 127
 128         __set_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags);
 129
 130         /*
 131          * Enable RX.
 132          */
 133         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 134
 135         /*
 136          * Start the TX queues.
 137          */
 138         ieee80211_start_queues(rt2x00dev->hw);
 139
 140         return 0;
 141 }
 142
 143 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
 144 {
 145         if (!__test_and_clear_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 146                 return;
 147
 148         /*
 149          * Stop all scheduled work.
 150          */
 151         if (work_pending(&rt2x00dev->beacon_work))
 152                 cancel_work_sync(&rt2x00dev->beacon_work);
 153         if (work_pending(&rt2x00dev->filter_work))
 154                 cancel_work_sync(&rt2x00dev->filter_work);
 155         if (work_pending(&rt2x00dev->config_work))
 156                 cancel_work_sync(&rt2x00dev->config_work);
 157
 158         /*
 159          * Stop the TX queues.
 160          */
 161         ieee80211_stop_queues(rt2x00dev->hw);
 162
 163         /*
 164          * Disable RX.
 165          */
 166         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 167
 168         /*
 169          * Disable radio.
 170          */
 171         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 172 }
 173
 174 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 175 {
 176         /*
 177          * When we are disabling the RX, we should also stop the link tuner.
 178          */
 179         if (state == STATE_RADIO_RX_OFF)
 180                 rt2x00lib_stop_link_tuner(rt2x00dev);
 181
 182         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 183
 184         /*
 185          * When we are enabling the RX, we should also start the link tuner.
 186          */
 187         if (state == STATE_RADIO_RX_ON &&
 188             is_interface_present(&rt2x00dev->interface))
 189                 rt2x00lib_start_link_tuner(rt2x00dev);
 190 }
 191
 192 static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev *rt2x00dev)
 193 {
 194         enum antenna rx = rt2x00dev->link.ant.active.rx;
 195         enum antenna tx = rt2x00dev->link.ant.active.tx;
 196         int sample_a =
 197             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_A);
 198         int sample_b =
 199             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_B);
 200
 201         /*
 202          * We are done sampling. Now we should evaluate the results.
 203          */
 204         rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
 205
 206         /*
 207          * During the last period we have sampled the RSSI
 208          * from both antenna's. It now is time to determine
 209          * which antenna demonstrated the best performance.
 210          * When we are already on the antenna with the best
 211          * performance, then there really is nothing for us
 212          * left to do.
 213          */
 214         if (sample_a == sample_b)
 215                 return;
 216
 217         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) {
 218                 if (sample_a > sample_b && rx == ANTENNA_B)
 219                         rx = ANTENNA_A;
 220                 else if (rx == ANTENNA_A)
 221                         rx = ANTENNA_B;
 222         }
 223
 224         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY) {
 225                 if (sample_a > sample_b && tx == ANTENNA_B)
 226                         tx = ANTENNA_A;
 227                 else if (tx == ANTENNA_A)
 228                         tx = ANTENNA_B;
 229         }
 230
 231         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 232 }
 233
 234 static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
 235 {
 236         enum antenna rx = rt2x00dev->link.ant.active.rx;
 237         enum antenna tx = rt2x00dev->link.ant.active.tx;
 238         int rssi_curr = rt2x00_get_link_ant_rssi(&rt2x00dev->link);
 239         int rssi_old = rt2x00_update_ant_rssi(&rt2x00dev->link, rssi_curr);
 240
 241         /*
 242          * Legacy driver indicates that we should swap antenna's
 243          * when the difference in RSSI is greater that 5. This
 244          * also should be done when the RSSI was actually better
 245          * then the previous sample.
 246          * When the difference exceeds the threshold we should
 247          * sample the rssi from the other antenna to make a valid
 248          * comparison between the 2 antennas.
 249          */
 250         if ((rssi_curr - rssi_old) > -5 || (rssi_curr - rssi_old) < 5)
 251                 return;
 252
 253         rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;
 254
 255         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 256                 rx = (rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 257
 258         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 259                 tx = (tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 260
 261         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 262 }
 263
 264 static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
 265 {
 266         /*
 267          * Determine if software diversity is enabled for
 268          * either the TX or RX antenna (or both).
 269          * Always perform this check since within the link
 270          * tuner interval the configuration might have changed.
 271          */
 272         rt2x00dev->link.ant.flags &= ~ANTENNA_RX_DIVERSITY;
 273         rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;
 274
 275         if (rt2x00dev->hw->conf.antenna_sel_rx == 0 &&
 276             rt2x00dev->default_ant.rx != ANTENNA_SW_DIVERSITY)
 277                 rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
 278         if (rt2x00dev->hw->conf.antenna_sel_tx == 0 &&
 279             rt2x00dev->default_ant.tx != ANTENNA_SW_DIVERSITY)
 280                 rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;
 281
 282         if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&
 283             !(rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)) {
 284                 rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
 285                 return;
 286         }
 287
 288         /*
 289          * If we have only sampled the data over the last period
 290          * we should now harvest the data. Otherwise just evaluate
 291          * the data. The latter should only be performed once
 292          * every 2 seconds.
 293          */
 294         if (rt2x00dev->link.ant.flags & ANTENNA_MODE_SAMPLE)
 295                 rt2x00lib_evaluate_antenna_sample(rt2x00dev);
 296         else if (rt2x00dev->link.count & 1)
 297                 rt2x00lib_evaluate_antenna_eval(rt2x00dev);
 298 }
 299
 300 static void rt2x00lib_update_link_stats(struct link *link, int rssi)
 301 {
 302         int avg_rssi = rssi;
 303
 304         /*
 305          * Update global RSSI
 306          */
 307         if (link->qual.avg_rssi)
 308                 avg_rssi = MOVING_AVERAGE(link->qual.avg_rssi, rssi, 8);
 309         link->qual.avg_rssi = avg_rssi;
 310
 311         /*
 312          * Update antenna RSSI
 313          */
 314         if (link->ant.rssi_ant)
 315                 rssi = MOVING_AVERAGE(link->ant.rssi_ant, rssi, 8);
 316         link->ant.rssi_ant = rssi;
 317 }
 318
 319 static void rt2x00lib_precalculate_link_signal(struct link_qual *qual)
 320 {
 321         if (qual->rx_failed || qual->rx_success)
 322                 qual->rx_percentage =
 323                     (qual->rx_success * 100) /
 324                     (qual->rx_failed + qual->rx_success);
 325         else
 326                 qual->rx_percentage = 50;
 327
 328         if (qual->tx_failed || qual->tx_success)
 329                 qual->tx_percentage =
 330                     (qual->tx_success * 100) /
 331                     (qual->tx_failed + qual->tx_success);
 332         else
 333                 qual->tx_percentage = 50;
 334
 335         qual->rx_success = 0;
 336         qual->rx_failed = 0;
 337         qual->tx_success = 0;
 338         qual->tx_failed = 0;
 339 }
 340
 341 static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
 342                                            int rssi)
 343 {
 344         int rssi_percentage = 0;
 345         int signal;
 346
 347         /*
 348          * We need a positive value for the RSSI.
 349          */
 350         if (rssi < 0)
 351                 rssi += rt2x00dev->rssi_offset;
 352
 353         /*
 354          * Calculate the different percentages,
 355          * which will be used for the signal.
 356          */
 357         if (rt2x00dev->rssi_offset)
 358                 rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
 359
 360         /*
 361          * Add the individual percentages and use the WEIGHT
 362          * defines to calculate the current link signal.
 363          */
 364         signal = ((WEIGHT_RSSI * rssi_percentage) +
 365                   (WEIGHT_TX * rt2x00dev->link.qual.tx_percentage) +
 366                   (WEIGHT_RX * rt2x00dev->link.qual.rx_percentage)) / 100;
 367
 368         return (signal > 100) ? 100 : signal;
 369 }
 370
 371 static void rt2x00lib_link_tuner(struct work_struct *work)
 372 {
 373         struct rt2x00_dev *rt2x00dev =
 374             container_of(work, struct rt2x00_dev, link.work.work);
 375
 376         /*
 377          * When the radio is shutting down we should
 378          * immediately cease all link tuning.
 379          */
 380         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 381                 return;
 382
 383         /*
 384          * Update statistics.
 385          */
 386         rt2x00dev->ops->lib->link_stats(rt2x00dev, &rt2x00dev->link.qual);
 387         rt2x00dev->low_level_stats.dot11FCSErrorCount +=
 388             rt2x00dev->link.qual.rx_failed;
 389
 390         /*
 391          * Only perform the link tuning when Link tuning
 392          * has been enabled (This could have been disabled from the EEPROM).
 393          */
 394         if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
 395                 rt2x00dev->ops->lib->link_tuner(rt2x00dev);
 396
 397         /*
 398          * Evaluate antenna setup.
 399          */
 400         rt2x00lib_evaluate_antenna(rt2x00dev);
 401
 402         /*
 403          * Precalculate a portion of the link signal which is
 404          * in based on the tx/rx success/failure counters.
 405          */
 406         rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
 407
 408         /*
 409          * Increase tuner counter, and reschedule the next link tuner run.
 410          */
 411         rt2x00dev->link.count++;
 412         queue_delayed_work(rt2x00dev->hw->workqueue, &rt2x00dev->link.work,
 413                            LINK_TUNE_INTERVAL);
 414 }
 415
 416 static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
 417 {
 418         struct rt2x00_dev *rt2x00dev =
 419             container_of(work, struct rt2x00_dev, filter_work);
 420         unsigned int filter = rt2x00dev->interface.filter;
 421
 422         /*
 423          * Since we had stored the filter inside interface.filter,
 424          * we should now clear that field. Otherwise the driver will
 425          * assume nothing has changed (*total_flags will be compared
 426          * to interface.filter to determine if any action is required).
 427          */
 428         rt2x00dev->interface.filter = 0;
 429
 430         rt2x00dev->ops->hw->configure_filter(rt2x00dev->hw,
 431                                              filter, &filter, 0, NULL);
 432 }
 433
 434 static void rt2x00lib_configuration_scheduled(struct work_struct *work)
 435 {
 436         struct rt2x00_dev *rt2x00dev =
 437             container_of(work, struct rt2x00_dev, config_work);
 438         int preamble = !test_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
 439
 440         rt2x00mac_erp_ie_changed(rt2x00dev->hw,
 441                                  IEEE80211_ERP_CHANGE_PREAMBLE, 0, preamble);
 442 }
 443
 444 /*
 445  * Interrupt context handlers.
 446  */
 447 static void rt2x00lib_beacondone_scheduled(struct work_struct *work)
 448 {
 449         struct rt2x00_dev *rt2x00dev =
 450             container_of(work, struct rt2x00_dev, beacon_work);
 451         struct data_ring *ring =
 452             rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
 453         struct data_entry *entry = rt2x00_get_data_entry(ring);
 454         struct sk_buff *skb;
 455
 456         skb = ieee80211_beacon_get(rt2x00dev->hw,
 457                                    rt2x00dev->interface.id,
 458                                    &entry->tx_status.control);
 459         if (!skb)
 460                 return;
 461
 462         rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, skb,
 463                                           &entry->tx_status.control);
 464
 465         dev_kfree_skb(skb);
 466 }
 467
 468 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 469 {
 470         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 471                 return;
 472
 473         queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->beacon_work);
 474 }
 475 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 476
 477 void rt2x00lib_txdone(struct data_entry *entry,
 478                       const int status, const int retry)
 479 {
 480         struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
 481         struct ieee80211_tx_status *tx_status = &entry->tx_status;
 482         struct ieee80211_low_level_stats *stats = &rt2x00dev->low_level_stats;
 483         int success = !!(status == TX_SUCCESS || status == TX_SUCCESS_RETRY);
 484         int fail = !!(status == TX_FAIL_RETRY || status == TX_FAIL_INVALID ||
 485                       status == TX_FAIL_OTHER);
 486
 487         /*
 488          * Update TX statistics.
 489          */
 490         tx_status->flags = 0;
 491         tx_status->ack_signal = 0;
 492         tx_status->excessive_retries = (status == TX_FAIL_RETRY);
 493         tx_status->retry_count = retry;
 494         rt2x00dev->link.qual.tx_success += success;
 495         rt2x00dev->link.qual.tx_failed += retry + fail;
 496
 497         if (!(tx_status->control.flags & IEEE80211_TXCTL_NO_ACK)) {
 498                 if (success)
 499                         tx_status->flags |= IEEE80211_TX_STATUS_ACK;
 500                 else
 501                         stats->dot11ACKFailureCount++;
 502         }
 503
 504         tx_status->queue_length = entry->ring->stats.limit;
 505         tx_status->queue_number = tx_status->control.queue;
 506
 507         if (tx_status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) {
 508                 if (success)
 509                         stats->dot11RTSSuccessCount++;
 510                 else
 511                         stats->dot11RTSFailureCount++;
 512         }
 513
 514         /*
 515          * Send the tx_status to mac80211 & debugfs.
 516          * mac80211 will clean up the skb structure.
 517          */
 518         get_skb_desc(entry->skb)->frame_type = DUMP_FRAME_TXDONE;
 519         rt2x00debug_dump_frame(rt2x00dev, entry->skb);
 520         ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb, tx_status);
 521         entry->skb = NULL;
 522 }
 523 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 524
 525 void rt2x00lib_rxdone(struct data_entry *entry, struct sk_buff *skb,
 526                       struct rxdata_entry_desc *desc)
 527 {
 528         struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
 529         struct interface *intf = &rt2x00dev->interface;
 530         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 531         struct ieee80211_hw_mode *mode;
 532         struct ieee80211_rate *rate;
 533         struct ieee80211_hdr *hdr;
 534         unsigned int i;
 535         int val = 0;
 536         u16 fc;
 537
 538         /*
 539          * Update RX statistics.
 540          */
 541         mode = &rt2x00dev->hwmodes[rt2x00dev->curr_hwmode];
 542         for (i = 0; i < mode->num_rates; i++) {
 543                 rate = &mode->rates[i];
 544
 545                 /*
 546                  * When frame was received with an OFDM bitrate,
 547                  * the signal is the PLCP value. If it was received with
 548                  * a CCK bitrate the signal is the rate in 0.5kbit/s.
 549                  */
 550                 if (!desc->ofdm)
 551                         val = DEVICE_GET_RATE_FIELD(rate->val, RATE);
 552                 else
 553                         val = DEVICE_GET_RATE_FIELD(rate->val, PLCP);
 554
 555                 if (val == desc->signal) {
 556                         val = rate->val;
 557                         break;
 558                 }
 559         }
 560
 561         /*
 562          * Only update link status if this is a beacon frame carrying our
 563          * bssid.
 564          */
 565         hdr = (struct ieee80211_hdr *) skb->data;
 566         if (skb->len >= sizeof(struct ieee80211_hdr *)) {
 567                 fc = le16_to_cpu(hdr->frame_control);
 568                 if ((intf->type == IEEE80211_IF_TYPE_STA
 569                      || intf->type == IEEE80211_IF_TYPE_IBSS)
 570                     && is_beacon(fc)
 571                     && compare_ether_addr(hdr->addr3, intf->bssid) == 0)
 572                         rt2x00lib_update_link_stats(&rt2x00dev->link,
 573                                                     desc->rssi);
 574         }
 575
 576         rt2x00dev->link.qual.rx_success++;
 577
 578         rx_status->rate = val;
 579         rx_status->signal =
 580             rt2x00lib_calculate_link_signal(rt2x00dev, desc->rssi);
 581         rx_status->ssi = desc->rssi;
 582         rx_status->flag = desc->flags;
 583         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 584
 585         /*
 586          * Send frame to mac80211 & debugfs
 587          */
 588         get_skb_desc(skb)->frame_type = DUMP_FRAME_RXDONE;
 589         rt2x00debug_dump_frame(rt2x00dev, skb);
 590         ieee80211_rx_irqsafe(rt2x00dev->hw, skb, rx_status);
 591 }
 592 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 593
 594 /*
 595  * TX descriptor initializer
 596  */
 597 void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 598                              struct sk_buff *skb,
 599                              struct ieee80211_tx_control *control)
 600 {
 601         struct txdata_entry_desc desc;
 602         struct skb_desc *skbdesc = get_skb_desc(skb);
 603         struct ieee80211_hdr *ieee80211hdr = skbdesc->data;
 604         __le32 *txd = skbdesc->desc;
 605         int tx_rate;
 606         int bitrate;
 607         int length;
 608         int duration;
 609         int residual;
 610         u16 frame_control;
 611         u16 seq_ctrl;
 612
 613         memset(&desc, 0, sizeof(desc));
 614
 615         desc.cw_min = skbdesc->ring->tx_params.cw_min;
 616         desc.cw_max = skbdesc->ring->tx_params.cw_max;
 617         desc.aifs = skbdesc->ring->tx_params.aifs;
 618
 619         /*
 620          * Identify queue
 621          */
 622         if (control->queue < rt2x00dev->hw->queues)
 623                 desc.queue = control->queue;
 624         else if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 625                  control->queue == IEEE80211_TX_QUEUE_AFTER_BEACON)
 626                 desc.queue = QUEUE_MGMT;
 627         else
 628                 desc.queue = QUEUE_OTHER;
 629
 630         /*
 631          * Read required fields from ieee80211 header.
 632          */
 633         frame_control = le16_to_cpu(ieee80211hdr->frame_control);
 634         seq_ctrl = le16_to_cpu(ieee80211hdr->seq_ctrl);
 635
 636         tx_rate = control->tx_rate;
 637
 638         /*
 639          * Check whether this frame is to be acked
 640          */
 641         if (!(control->flags & IEEE80211_TXCTL_NO_ACK))
 642                 __set_bit(ENTRY_TXD_ACK, &desc.flags);
 643
 644         /*
 645          * Check if this is a RTS/CTS frame
 646          */
 647         if (is_rts_frame(frame_control) || is_cts_frame(frame_control)) {
 648                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 649                 if (is_rts_frame(frame_control)) {
 650                         __set_bit(ENTRY_TXD_RTS_FRAME, &desc.flags);
 651                         __set_bit(ENTRY_TXD_ACK, &desc.flags);
 652                 } else
 653                         __clear_bit(ENTRY_TXD_ACK, &desc.flags);
 654                 if (control->rts_cts_rate)
 655                         tx_rate = control->rts_cts_rate;
 656         }
 657
 658         /*
 659          * Check for OFDM
 660          */
 661         if (DEVICE_GET_RATE_FIELD(tx_rate, RATEMASK) & DEV_OFDM_RATEMASK)
 662                 __set_bit(ENTRY_TXD_OFDM_RATE, &desc.flags);
 663
 664         /*
 665          * Check if more fragments are pending
 666          */
 667         if (ieee80211_get_morefrag(ieee80211hdr)) {
 668                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 669                 __set_bit(ENTRY_TXD_MORE_FRAG, &desc.flags);
 670         }
 671
 672         /*
 673          * Beacons and probe responses require the tsf timestamp
 674          * to be inserted into the frame.
 675          */
 676         if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 677             is_probe_resp(frame_control))
 678                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &desc.flags);
 679
 680         /*
 681          * Determine with what IFS priority this frame should be send.
 682          * Set ifs to IFS_SIFS when the this is not the first fragment,
 683          * or this fragment came after RTS/CTS.
 684          */
 685         if ((seq_ctrl & IEEE80211_SCTL_FRAG) > 0 ||
 686             test_bit(ENTRY_TXD_RTS_FRAME, &desc.flags))
 687                 desc.ifs = IFS_SIFS;
 688         else
 689                 desc.ifs = IFS_BACKOFF;
 690
 691         /*
 692          * PLCP setup
 693          * Length calculation depends on OFDM/CCK rate.
 694          */
 695         desc.signal = DEVICE_GET_RATE_FIELD(tx_rate, PLCP);
 696         desc.service = 0x04;
 697
 698         length = skbdesc->data_len + FCS_LEN;
 699         if (test_bit(ENTRY_TXD_OFDM_RATE, &desc.flags)) {
 700                 desc.length_high = (length >> 6) & 0x3f;
 701                 desc.length_low = length & 0x3f;
 702         } else {
 703                 bitrate = DEVICE_GET_RATE_FIELD(tx_rate, RATE);
 704
 705                 /*
 706                  * Convert length to microseconds.
 707                  */
 708                 residual = get_duration_res(length, bitrate);
 709                 duration = get_duration(length, bitrate);
 710
 711                 if (residual != 0) {
 712                         duration++;
 713
 714                         /*
 715                          * Check if we need to set the Length Extension
 716                          */
 717                         if (bitrate == 110 && residual <= 30)
 718                                 desc.service |= 0x80;
 719                 }
 720
 721                 desc.length_high = (duration >> 8) & 0xff;
 722                 desc.length_low = duration & 0xff;
 723
 724                 /*
 725                  * When preamble is enabled we should set the
 726                  * preamble bit for the signal.
 727                  */
 728                 if (DEVICE_GET_RATE_FIELD(tx_rate, PREAMBLE))
 729                         desc.signal |= 0x08;
 730         }
 731
 732         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, txd, &desc, ieee80211hdr,
 733                                            skbdesc->data_len, control);
 734
 735         /*
 736          * Update ring entry.
 737          */
 738         skbdesc->entry->skb = skb;
 739         memcpy(&skbdesc->entry->tx_status.control, control, sizeof(*control));
 740
 741         /*
 742          * The frame has been completely initialized and ready
 743          * for sending to the device. The caller will push the
 744          * frame to the device, but we are going to push the
 745          * frame to debugfs here.
 746          */
 747         skbdesc->frame_type = DUMP_FRAME_TX;
 748         rt2x00debug_dump_frame(rt2x00dev, skb);
 749 }
 750 EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc);
 751
 752 /*
 753  * Driver initialization handlers.
 754  */
 755 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 756                               const int channel, const int tx_power,
 757                               const int value)
 758 {
 759         entry->chan = channel;
 760         if (channel <= 14)
 761                 entry->freq = 2407 + (5 * channel);
 762         else
 763                 entry->freq = 5000 + (5 * channel);
 764         entry->val = value;
 765         entry->flag =
 766             IEEE80211_CHAN_W_IBSS |
 767             IEEE80211_CHAN_W_ACTIVE_SCAN |
 768             IEEE80211_CHAN_W_SCAN;
 769         entry->power_level = tx_power;
 770         entry->antenna_max = 0xff;
 771 }
 772
 773 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 774                            const int rate, const int mask,
 775                            const int plcp, const int flags)
 776 {
 777         entry->rate = rate;
 778         entry->val =
 779             DEVICE_SET_RATE_FIELD(rate, RATE) |
 780             DEVICE_SET_RATE_FIELD(mask, RATEMASK) |
 781             DEVICE_SET_RATE_FIELD(plcp, PLCP);
 782         entry->flags = flags;
 783         entry->val2 = entry->val;
 784         if (entry->flags & IEEE80211_RATE_PREAMBLE2)
 785                 entry->val2 |= DEVICE_SET_RATE_FIELD(1, PREAMBLE);
 786         entry->min_rssi_ack = 0;
 787         entry->min_rssi_ack_delta = 0;
 788 }
 789
 790 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 791                                     struct hw_mode_spec *spec)
 792 {
 793         struct ieee80211_hw *hw = rt2x00dev->hw;
 794         struct ieee80211_hw_mode *hwmodes;
 795         struct ieee80211_channel *channels;
 796         struct ieee80211_rate *rates;
 797         unsigned int i;
 798         unsigned char tx_power;
 799
 800         hwmodes = kzalloc(sizeof(*hwmodes) * spec->num_modes, GFP_KERNEL);
 801         if (!hwmodes)
 802                 goto exit;
 803
 804         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 805         if (!channels)
 806                 goto exit_free_modes;
 807
 808         rates = kzalloc(sizeof(*rates) * spec->num_rates, GFP_KERNEL);
 809         if (!rates)
 810                 goto exit_free_channels;
 811
 812         /*
 813          * Initialize Rate list.
 814          */
 815         rt2x00lib_rate(&rates[0], 10, DEV_RATEMASK_1MB,
 816                        0x00, IEEE80211_RATE_CCK);
 817         rt2x00lib_rate(&rates[1], 20, DEV_RATEMASK_2MB,
 818                        0x01, IEEE80211_RATE_CCK_2);
 819         rt2x00lib_rate(&rates[2], 55, DEV_RATEMASK_5_5MB,
 820                        0x02, IEEE80211_RATE_CCK_2);
 821         rt2x00lib_rate(&rates[3], 110, DEV_RATEMASK_11MB,
 822                        0x03, IEEE80211_RATE_CCK_2);
 823
 824         if (spec->num_rates > 4) {
 825                 rt2x00lib_rate(&rates[4], 60, DEV_RATEMASK_6MB,
 826                                0x0b, IEEE80211_RATE_OFDM);
 827                 rt2x00lib_rate(&rates[5], 90, DEV_RATEMASK_9MB,
 828                                0x0f, IEEE80211_RATE_OFDM);
 829                 rt2x00lib_rate(&rates[6], 120, DEV_RATEMASK_12MB,
 830                                0x0a, IEEE80211_RATE_OFDM);
 831                 rt2x00lib_rate(&rates[7], 180, DEV_RATEMASK_18MB,
 832                                0x0e, IEEE80211_RATE_OFDM);
 833                 rt2x00lib_rate(&rates[8], 240, DEV_RATEMASK_24MB,
 834                                0x09, IEEE80211_RATE_OFDM);
 835                 rt2x00lib_rate(&rates[9], 360, DEV_RATEMASK_36MB,
 836                                0x0d, IEEE80211_RATE_OFDM);
 837                 rt2x00lib_rate(&rates[10], 480, DEV_RATEMASK_48MB,
 838                                0x08, IEEE80211_RATE_OFDM);
 839                 rt2x00lib_rate(&rates[11], 540, DEV_RATEMASK_54MB,
 840                                0x0c, IEEE80211_RATE_OFDM);
 841         }
 842
 843         /*
 844          * Initialize Channel list.
 845          */
 846         for (i = 0; i < spec->num_channels; i++) {
 847                 if (spec->channels[i].channel <= 14)
 848                         tx_power = spec->tx_power_bg[i];
 849                 else if (spec->tx_power_a)
 850                         tx_power = spec->tx_power_a[i];
 851                 else
 852                         tx_power = spec->tx_power_default;
 853
 854                 rt2x00lib_channel(&channels[i],
 855                                   spec->channels[i].channel, tx_power, i);
 856         }
 857
 858         /*
 859          * Intitialize 802.11b
 860          * Rates: CCK.
 861          * Channels: OFDM.
 862          */
 863         if (spec->num_modes > HWMODE_B) {
 864                 hwmodes[HWMODE_B].mode = MODE_IEEE80211B;
 865                 hwmodes[HWMODE_B].num_channels = 14;
 866                 hwmodes[HWMODE_B].num_rates = 4;
 867                 hwmodes[HWMODE_B].channels = channels;
 868                 hwmodes[HWMODE_B].rates = rates;
 869         }
 870
 871         /*
 872          * Intitialize 802.11g
 873          * Rates: CCK, OFDM.
 874          * Channels: OFDM.
 875          */
 876         if (spec->num_modes > HWMODE_G) {
 877                 hwmodes[HWMODE_G].mode = MODE_IEEE80211G;
 878                 hwmodes[HWMODE_G].num_channels = 14;
 879                 hwmodes[HWMODE_G].num_rates = spec->num_rates;
 880                 hwmodes[HWMODE_G].channels = channels;
 881                 hwmodes[HWMODE_G].rates = rates;
 882         }
 883
 884         /*
 885          * Intitialize 802.11a
 886          * Rates: OFDM.
 887          * Channels: OFDM, UNII, HiperLAN2.
 888          */
 889         if (spec->num_modes > HWMODE_A) {
 890                 hwmodes[HWMODE_A].mode = MODE_IEEE80211A;
 891                 hwmodes[HWMODE_A].num_channels = spec->num_channels - 14;
 892                 hwmodes[HWMODE_A].num_rates = spec->num_rates - 4;
 893                 hwmodes[HWMODE_A].channels = &channels[14];
 894                 hwmodes[HWMODE_A].rates = &rates[4];
 895         }
 896
 897         if (spec->num_modes > HWMODE_G &&
 898             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_G]))
 899                 goto exit_free_rates;
 900
 901         if (spec->num_modes > HWMODE_B &&
 902             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_B]))
 903                 goto exit_free_rates;
 904
 905         if (spec->num_modes > HWMODE_A &&
 906             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_A]))
 907                 goto exit_free_rates;
 908
 909         rt2x00dev->hwmodes = hwmodes;
 910
 911         return 0;
 912
 913 exit_free_rates:
 914         kfree(rates);
 915
 916 exit_free_channels:
 917         kfree(channels);
 918
 919 exit_free_modes:
 920         kfree(hwmodes);
 921
 922 exit:
 923         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 924         return -ENOMEM;
 925 }
 926
 927 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 928 {
 929         if (test_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags))
 930                 ieee80211_unregister_hw(rt2x00dev->hw);
 931
 932         if (likely(rt2x00dev->hwmodes)) {
 933                 kfree(rt2x00dev->hwmodes->channels);
 934                 kfree(rt2x00dev->hwmodes->rates);
 935                 kfree(rt2x00dev->hwmodes);
 936                 rt2x00dev->hwmodes = NULL;
 937         }
 938 }
 939
 940 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 941 {
 942         struct hw_mode_spec *spec = &rt2x00dev->spec;
 943         int status;
 944
 945         /*
 946          * Initialize HW modes.
 947          */
 948         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 949         if (status)
 950                 return status;
 951
 952         /*
 953          * Register HW.
 954          */
 955         status = ieee80211_register_hw(rt2x00dev->hw);
 956         if (status) {
 957                 rt2x00lib_remove_hw(rt2x00dev);
 958                 return status;
 959         }
 960
 961         __set_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags);
 962
 963         return 0;
 964 }
 965
 966 /*
 967  * Initialization/uninitialization handlers.
 968  */
 969 static int rt2x00lib_alloc_entries(struct data_ring *ring,
 970                                    const u16 max_entries, const u16 data_size,
 971                                    const u16 desc_size)
 972 {
 973         struct data_entry *entry;
 974         unsigned int i;
 975
 976         ring->stats.limit = max_entries;
 977         ring->data_size = data_size;
 978         ring->desc_size = desc_size;
 979
 980         /*
 981          * Allocate all ring entries.
 982          */
 983         entry = kzalloc(ring->stats.limit * sizeof(*entry), GFP_KERNEL);
 984         if (!entry)
 985                 return -ENOMEM;
 986
 987         for (i = 0; i < ring->stats.limit; i++) {
 988                 entry[i].flags = 0;
 989                 entry[i].ring = ring;
 990                 entry[i].skb = NULL;
 991         }
 992
 993         ring->entry = entry;
 994
 995         return 0;
 996 }
 997
 998 static int rt2x00lib_alloc_ring_entries(struct rt2x00_dev *rt2x00dev)
 999 {
1000         struct data_ring *ring;
1001
1002         /*
1003          * Allocate the RX ring.
1004          */
1005         if (rt2x00lib_alloc_entries(rt2x00dev->rx, RX_ENTRIES, DATA_FRAME_SIZE,
1006                                     rt2x00dev->ops->rxd_size))
1007                 return -ENOMEM;
1008
1009         /*
1010          * First allocate the TX rings.
1011          */
1012         txring_for_each(rt2x00dev, ring) {
1013                 if (rt2x00lib_alloc_entries(ring, TX_ENTRIES, DATA_FRAME_SIZE,
1014                                             rt2x00dev->ops->txd_size))
1015                         return -ENOMEM;
1016         }
1017
1018         if (!test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
1019                 return 0;
1020
1021         /*
1022          * Allocate the BEACON ring.
1023          */
1024         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[0], BEACON_ENTRIES,
1025                                     MGMT_FRAME_SIZE, rt2x00dev->ops->txd_size))
1026                 return -ENOMEM;
1027
1028         /*
1029          * Allocate the Atim ring.
1030          */
1031         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[1], ATIM_ENTRIES,
1032                                     DATA_FRAME_SIZE, rt2x00dev->ops->txd_size))
1033                 return -ENOMEM;
1034
1035         return 0;
1036 }
1037
1038 static void rt2x00lib_free_ring_entries(struct rt2x00_dev *rt2x00dev)
1039 {
1040         struct data_ring *ring;
1041
1042         ring_for_each(rt2x00dev, ring) {
1043                 kfree(ring->entry);
1044                 ring->entry = NULL;
1045         }
1046 }
1047
1048 void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
1049 {
1050         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1051                 return;
1052
1053         /*
1054          * Unregister rfkill.
1055          */
1056         rt2x00rfkill_unregister(rt2x00dev);
1057
1058         /*
1059          * Allow the HW to uninitialize.
1060          */
1061         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1062
1063         /*
1064          * Free allocated ring entries.
1065          */
1066         rt2x00lib_free_ring_entries(rt2x00dev);
1067 }
1068
1069 int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1070 {
1071         int status;
1072
1073         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1074                 return 0;
1075
1076         /*
1077          * Allocate all ring entries.
1078          */
1079         status = rt2x00lib_alloc_ring_entries(rt2x00dev);
1080         if (status) {
1081                 ERROR(rt2x00dev, "Ring entries allocation failed.\n");
1082                 return status;
1083         }
1084
1085         /*
1086          * Initialize the device.
1087          */
1088         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1089         if (status)
1090                 goto exit;
1091
1092         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
1093
1094         /*
1095          * Register the rfkill handler.
1096          */
1097         status = rt2x00rfkill_register(rt2x00dev);
1098         if (status)
1099                 goto exit_unitialize;
1100
1101         return 0;
1102
1103 exit_unitialize:
1104         rt2x00lib_uninitialize(rt2x00dev);
1105
1106 exit:
1107         rt2x00lib_free_ring_entries(rt2x00dev);
1108
1109         return status;
1110 }
1111
1112 /*
1113  * driver allocation handlers.
1114  */
1115 static int rt2x00lib_alloc_rings(struct rt2x00_dev *rt2x00dev)
1116 {
1117         struct data_ring *ring;
1118
1119         /*
1120          * We need the following rings:
1121          * RX: 1
1122          * TX: hw->queues
1123          * Beacon: 1 (if required)
1124          * Atim: 1 (if required)
1125          */
1126         rt2x00dev->data_rings = 1 + rt2x00dev->hw->queues +
1127             (2 * test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags));
1128
1129         ring = kzalloc(rt2x00dev->data_rings * sizeof(*ring), GFP_KERNEL);
1130         if (!ring) {
1131                 ERROR(rt2x00dev, "Ring allocation failed.\n");
1132                 return -ENOMEM;
1133         }
1134
1135         /*
1136          * Initialize pointers
1137          */
1138         rt2x00dev->rx = ring;
1139         rt2x00dev->tx = &rt2x00dev->rx[1];
1140         if (test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
1141                 rt2x00dev->bcn = &rt2x00dev->tx[rt2x00dev->hw->queues];
1142
1143         /*
1144          * Initialize ring parameters.
1145          * cw_min: 2^5 = 32.
1146          * cw_max: 2^10 = 1024.
1147          */
1148         ring_for_each(rt2x00dev, ring) {
1149                 ring->rt2x00dev = rt2x00dev;
1150                 ring->tx_params.aifs = 2;
1151                 ring->tx_params.cw_min = 5;
1152                 ring->tx_params.cw_max = 10;
1153         }
1154
1155         return 0;
1156 }
1157
1158 static void rt2x00lib_free_rings(struct rt2x00_dev *rt2x00dev)
1159 {
1160         kfree(rt2x00dev->rx);
1161         rt2x00dev->rx = NULL;
1162         rt2x00dev->tx = NULL;
1163         rt2x00dev->bcn = NULL;
1164 }
1165
1166 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1167 {
1168         int retval = -ENOMEM;
1169
1170         /*
1171          * Let the driver probe the device to detect the capabilities.
1172          */
1173         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1174         if (retval) {
1175                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1176                 goto exit;
1177         }
1178
1179         /*
1180          * Initialize configuration work.
1181          */
1182         INIT_WORK(&rt2x00dev->beacon_work, rt2x00lib_beacondone_scheduled);
1183         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
1184         INIT_WORK(&rt2x00dev->config_work, rt2x00lib_configuration_scheduled);
1185         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
1186
1187         /*
1188          * Reset current working type.
1189          */
1190         rt2x00dev->interface.type = IEEE80211_IF_TYPE_INVALID;
1191
1192         /*
1193          * Allocate ring array.
1194          */
1195         retval = rt2x00lib_alloc_rings(rt2x00dev);
1196         if (retval)
1197                 goto exit;
1198
1199         /*
1200          * Initialize ieee80211 structure.
1201          */
1202         retval = rt2x00lib_probe_hw(rt2x00dev);
1203         if (retval) {
1204                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1205                 goto exit;
1206         }
1207
1208         /*
1209          * Allocatie rfkill.
1210          */
1211         retval = rt2x00rfkill_allocate(rt2x00dev);
1212         if (retval)
1213                 goto exit;
1214
1215         /*
1216          * Open the debugfs entry.
1217          */
1218         rt2x00debug_register(rt2x00dev);
1219
1220         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1221
1222         return 0;
1223
1224 exit:
1225         rt2x00lib_remove_dev(rt2x00dev);
1226
1227         return retval;
1228 }
1229 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1230
1231 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1232 {
1233         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1234
1235         /*
1236          * Disable radio.
1237          */
1238         rt2x00lib_disable_radio(rt2x00dev);
1239
1240         /*
1241          * Uninitialize device.
1242          */
1243         rt2x00lib_uninitialize(rt2x00dev);
1244
1245         /*
1246          * Close debugfs entry.
1247          */
1248         rt2x00debug_deregister(rt2x00dev);
1249
1250         /*
1251          * Free rfkill
1252          */
1253         rt2x00rfkill_free(rt2x00dev);
1254
1255         /*
1256          * Free ieee80211_hw memory.
1257          */
1258         rt2x00lib_remove_hw(rt2x00dev);
1259
1260         /*
1261          * Free firmware image.
1262          */
1263         rt2x00lib_free_firmware(rt2x00dev);
1264
1265         /*
1266          * Free ring structures.
1267          */
1268         rt2x00lib_free_rings(rt2x00dev);
1269 }
1270 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1271
1272 /*
1273  * Device state handlers
1274  */
1275 #ifdef CONFIG_PM
1276 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1277 {
1278         int retval;
1279
1280         NOTICE(rt2x00dev, "Going to sleep.\n");
1281         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1282
1283         /*
1284          * Only continue if mac80211 has open interfaces.
1285          */
1286         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1287                 goto exit;
1288         __set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
1289
1290         /*
1291          * Disable radio and unitialize all items
1292          * that must be recreated on resume.
1293          */
1294         rt2x00mac_stop(rt2x00dev->hw);
1295         rt2x00lib_uninitialize(rt2x00dev);
1296         rt2x00debug_deregister(rt2x00dev);
1297
1298 exit:
1299         /*
1300          * Set device mode to sleep for power management.
1301          */
1302         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1303         if (retval)
1304                 return retval;
1305
1306         return 0;
1307 }
1308 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1309
1310 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1311 {
1312         struct interface *intf = &rt2x00dev->interface;
1313         int retval;
1314
1315         NOTICE(rt2x00dev, "Waking up.\n");
1316         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1317
1318         /*
1319          * Open the debugfs entry.
1320          */
1321         rt2x00debug_register(rt2x00dev);
1322
1323         /*
1324          * Only continue if mac80211 had open interfaces.
1325          */
1326         if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
1327                 return 0;
1328
1329         /*
1330          * Reinitialize device and all active interfaces.
1331          */
1332         retval = rt2x00mac_start(rt2x00dev->hw);
1333         if (retval)
1334                 goto exit;
1335
1336         /*
1337          * Reconfigure device.
1338          */
1339         rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
1340         if (!rt2x00dev->hw->conf.radio_enabled)
1341                 rt2x00lib_disable_radio(rt2x00dev);
1342
1343         rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
1344         rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
1345         rt2x00lib_config_type(rt2x00dev, intf->type);
1346
1347         /*
1348          * It is possible that during that mac80211 has attempted
1349          * to send frames while we were suspending or resuming.
1350          * In that case we have disabled the TX queue and should
1351          * now enable it again
1352          */
1353         ieee80211_start_queues(rt2x00dev->hw);
1354
1355         /*
1356          * When in Master or Ad-hoc mode,
1357          * restart Beacon transmitting by faking a beacondone event.
1358          */
1359         if (intf->type == IEEE80211_IF_TYPE_AP ||
1360             intf->type == IEEE80211_IF_TYPE_IBSS)
1361                 rt2x00lib_beacondone(rt2x00dev);
1362
1363         return 0;
1364
1365 exit:
1366         rt2x00lib_disable_radio(rt2x00dev);
1367         rt2x00lib_uninitialize(rt2x00dev);
1368         rt2x00debug_deregister(rt2x00dev);
1369
1370         return retval;
1371 }
1372 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1373 #endif /* CONFIG_PM */
1374
1375 /*
1376  * rt2x00lib module information.
1377  */
1378 MODULE_AUTHOR(DRV_PROJECT);
1379 MODULE_VERSION(DRV_VERSION);
1380 MODULE_DESCRIPTION("rt2x00 library");
1381 MODULE_LICENSE("GPL");