drivers/net/wireless/rt2x00/rt2x00dev.c

   1 /*
   2         Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00lib
  23         Abstract: rt2x00 generic device routines.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28
  29 #include "rt2x00.h"
  30 #include "rt2x00lib.h"
  31 #include "rt2x00dump.h"
  32
  33 /*
  34  * Link tuning handlers
  35  */
  36 void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
  37 {
  38         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
  39                 return;
  40
  41         /*
  42          * Reset link information.
  43          * Both the currently active vgc level as well as
  44          * the link tuner counter should be reset. Resetting
  45          * the counter is important for devices where the
  46          * device should only perform link tuning during the
  47          * first minute after being enabled.
  48          */
  49         rt2x00dev->link.count = 0;
  50         rt2x00dev->link.vgc_level = 0;
  51
  52         /*
  53          * Reset the link tuner.
  54          */
  55         rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
  56 }
  57
  58 static void rt2x00lib_start_link_tuner(struct rt2x00_dev *rt2x00dev)
  59 {
  60         /*
  61          * Clear all (possibly) pre-existing quality statistics.
  62          */
  63         memset(&rt2x00dev->link.qual, 0, sizeof(rt2x00dev->link.qual));
  64
  65         /*
  66          * The RX and TX percentage should start at 50%
  67          * this will assure we will get at least get some
  68          * decent value when the link tuner starts.
  69          * The value will be dropped and overwritten with
  70          * the correct (measured )value anyway during the
  71          * first run of the link tuner.
  72          */
  73         rt2x00dev->link.qual.rx_percentage = 50;
  74         rt2x00dev->link.qual.tx_percentage = 50;
  75
  76         rt2x00lib_reset_link_tuner(rt2x00dev);
  77
  78         queue_delayed_work(rt2x00dev->hw->workqueue,
  79                            &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
  80 }
  81
  82 static void rt2x00lib_stop_link_tuner(struct rt2x00_dev *rt2x00dev)
  83 {
  84         cancel_delayed_work_sync(&rt2x00dev->link.work);
  85 }
  86
  87 /*
  88  * Radio control handlers.
  89  */
  90 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  91 {
  92         int status;
  93
  94         /*
  95          * Don't enable the radio twice.
  96          * And check if the hardware button has been disabled.
  97          */
  98         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
  99             test_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags))
 100                 return 0;
 101
 102         /*
 103          * Initialize all data queues.
 104          */
 105         rt2x00queue_init_rx(rt2x00dev);
 106         rt2x00queue_init_tx(rt2x00dev);
 107
 108         /*
 109          * Enable radio.
 110          */
 111         status =
 112             rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
 113         if (status)
 114                 return status;
 115
 116         rt2x00leds_led_radio(rt2x00dev, true);
 117
 118         __set_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags);
 119
 120         /*
 121          * Enable RX.
 122          */
 123         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 124
 125         /*
 126          * Start the TX queues.
 127          */
 128         ieee80211_start_queues(rt2x00dev->hw);
 129
 130         return 0;
 131 }
 132
 133 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
 134 {
 135         if (!__test_and_clear_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 136                 return;
 137
 138         /*
 139          * Stop all scheduled work.
 140          */
 141         if (work_pending(&rt2x00dev->intf_work))
 142                 cancel_work_sync(&rt2x00dev->intf_work);
 143         if (work_pending(&rt2x00dev->filter_work))
 144                 cancel_work_sync(&rt2x00dev->filter_work);
 145
 146         /*
 147          * Stop the TX queues.
 148          */
 149         ieee80211_stop_queues(rt2x00dev->hw);
 150
 151         /*
 152          * Disable RX.
 153          */
 154         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 155
 156         /*
 157          * Disable radio.
 158          */
 159         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 160         rt2x00leds_led_radio(rt2x00dev, false);
 161 }
 162
 163 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 164 {
 165         /*
 166          * When we are disabling the RX, we should also stop the link tuner.
 167          */
 168         if (state == STATE_RADIO_RX_OFF)
 169                 rt2x00lib_stop_link_tuner(rt2x00dev);
 170
 171         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 172
 173         /*
 174          * When we are enabling the RX, we should also start the link tuner.
 175          */
 176         if (state == STATE_RADIO_RX_ON &&
 177             (rt2x00dev->intf_ap_count || rt2x00dev->intf_sta_count))
 178                 rt2x00lib_start_link_tuner(rt2x00dev);
 179 }
 180
 181 static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev *rt2x00dev)
 182 {
 183         enum antenna rx = rt2x00dev->link.ant.active.rx;
 184         enum antenna tx = rt2x00dev->link.ant.active.tx;
 185         int sample_a =
 186             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_A);
 187         int sample_b =
 188             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_B);
 189
 190         /*
 191          * We are done sampling. Now we should evaluate the results.
 192          */
 193         rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
 194
 195         /*
 196          * During the last period we have sampled the RSSI
 197          * from both antenna's. It now is time to determine
 198          * which antenna demonstrated the best performance.
 199          * When we are already on the antenna with the best
 200          * performance, then there really is nothing for us
 201          * left to do.
 202          */
 203         if (sample_a == sample_b)
 204                 return;
 205
 206         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 207                 rx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 208
 209         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 210                 tx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 211
 212         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 213 }
 214
 215 static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
 216 {
 217         enum antenna rx = rt2x00dev->link.ant.active.rx;
 218         enum antenna tx = rt2x00dev->link.ant.active.tx;
 219         int rssi_curr = rt2x00_get_link_ant_rssi(&rt2x00dev->link);
 220         int rssi_old = rt2x00_update_ant_rssi(&rt2x00dev->link, rssi_curr);
 221
 222         /*
 223          * Legacy driver indicates that we should swap antenna's
 224          * when the difference in RSSI is greater that 5. This
 225          * also should be done when the RSSI was actually better
 226          * then the previous sample.
 227          * When the difference exceeds the threshold we should
 228          * sample the rssi from the other antenna to make a valid
 229          * comparison between the 2 antennas.
 230          */
 231         if (abs(rssi_curr - rssi_old) < 5)
 232                 return;
 233
 234         rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;
 235
 236         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 237                 rx = (rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 238
 239         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 240                 tx = (tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 241
 242         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 243 }
 244
 245 static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
 246 {
 247         /*
 248          * Determine if software diversity is enabled for
 249          * either the TX or RX antenna (or both).
 250          * Always perform this check since within the link
 251          * tuner interval the configuration might have changed.
 252          */
 253         rt2x00dev->link.ant.flags &= ~ANTENNA_RX_DIVERSITY;
 254         rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;
 255
 256         if (rt2x00dev->hw->conf.antenna_sel_rx == 0 &&
 257             rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY)
 258                 rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
 259         if (rt2x00dev->hw->conf.antenna_sel_tx == 0 &&
 260             rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY)
 261                 rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;
 262
 263         if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&
 264             !(rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)) {
 265                 rt2x00dev->link.ant.flags = 0;
 266                 return;
 267         }
 268
 269         /*
 270          * If we have only sampled the data over the last period
 271          * we should now harvest the data. Otherwise just evaluate
 272          * the data. The latter should only be performed once
 273          * every 2 seconds.
 274          */
 275         if (rt2x00dev->link.ant.flags & ANTENNA_MODE_SAMPLE)
 276                 rt2x00lib_evaluate_antenna_sample(rt2x00dev);
 277         else if (rt2x00dev->link.count & 1)
 278                 rt2x00lib_evaluate_antenna_eval(rt2x00dev);
 279 }
 280
 281 static void rt2x00lib_update_link_stats(struct link *link, int rssi)
 282 {
 283         int avg_rssi = rssi;
 284
 285         /*
 286          * Update global RSSI
 287          */
 288         if (link->qual.avg_rssi)
 289                 avg_rssi = MOVING_AVERAGE(link->qual.avg_rssi, rssi, 8);
 290         link->qual.avg_rssi = avg_rssi;
 291
 292         /*
 293          * Update antenna RSSI
 294          */
 295         if (link->ant.rssi_ant)
 296                 rssi = MOVING_AVERAGE(link->ant.rssi_ant, rssi, 8);
 297         link->ant.rssi_ant = rssi;
 298 }
 299
 300 static void rt2x00lib_precalculate_link_signal(struct link_qual *qual)
 301 {
 302         if (qual->rx_failed || qual->rx_success)
 303                 qual->rx_percentage =
 304                     (qual->rx_success * 100) /
 305                     (qual->rx_failed + qual->rx_success);
 306         else
 307                 qual->rx_percentage = 50;
 308
 309         if (qual->tx_failed || qual->tx_success)
 310                 qual->tx_percentage =
 311                     (qual->tx_success * 100) /
 312                     (qual->tx_failed + qual->tx_success);
 313         else
 314                 qual->tx_percentage = 50;
 315
 316         qual->rx_success = 0;
 317         qual->rx_failed = 0;
 318         qual->tx_success = 0;
 319         qual->tx_failed = 0;
 320 }
 321
 322 static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
 323                                            int rssi)
 324 {
 325         int rssi_percentage = 0;
 326         int signal;
 327
 328         /*
 329          * We need a positive value for the RSSI.
 330          */
 331         if (rssi < 0)
 332                 rssi += rt2x00dev->rssi_offset;
 333
 334         /*
 335          * Calculate the different percentages,
 336          * which will be used for the signal.
 337          */
 338         if (rt2x00dev->rssi_offset)
 339                 rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
 340
 341         /*
 342          * Add the individual percentages and use the WEIGHT
 343          * defines to calculate the current link signal.
 344          */
 345         signal = ((WEIGHT_RSSI * rssi_percentage) +
 346                   (WEIGHT_TX * rt2x00dev->link.qual.tx_percentage) +
 347                   (WEIGHT_RX * rt2x00dev->link.qual.rx_percentage)) / 100;
 348
 349         return (signal > 100) ? 100 : signal;
 350 }
 351
 352 static void rt2x00lib_link_tuner(struct work_struct *work)
 353 {
 354         struct rt2x00_dev *rt2x00dev =
 355             container_of(work, struct rt2x00_dev, link.work.work);
 356
 357         /*
 358          * When the radio is shutting down we should
 359          * immediately cease all link tuning.
 360          */
 361         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 362                 return;
 363
 364         /*
 365          * Update statistics.
 366          */
 367         rt2x00dev->ops->lib->link_stats(rt2x00dev, &rt2x00dev->link.qual);
 368         rt2x00dev->low_level_stats.dot11FCSErrorCount +=
 369             rt2x00dev->link.qual.rx_failed;
 370
 371         /*
 372          * Only perform the link tuning when Link tuning
 373          * has been enabled (This could have been disabled from the EEPROM).
 374          */
 375         if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
 376                 rt2x00dev->ops->lib->link_tuner(rt2x00dev);
 377
 378         /*
 379          * Precalculate a portion of the link signal which is
 380          * in based on the tx/rx success/failure counters.
 381          */
 382         rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
 383
 384         /*
 385          * Send a signal to the led to update the led signal strength.
 386          */
 387         rt2x00leds_led_quality(rt2x00dev, rt2x00dev->link.qual.avg_rssi);
 388
 389         /*
 390          * Evaluate antenna setup, make this the last step since this could
 391          * possibly reset some statistics.
 392          */
 393         rt2x00lib_evaluate_antenna(rt2x00dev);
 394
 395         /*
 396          * Increase tuner counter, and reschedule the next link tuner run.
 397          */
 398         rt2x00dev->link.count++;
 399         queue_delayed_work(rt2x00dev->hw->workqueue, &rt2x00dev->link.work,
 400                            LINK_TUNE_INTERVAL);
 401 }
 402
 403 static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
 404 {
 405         struct rt2x00_dev *rt2x00dev =
 406             container_of(work, struct rt2x00_dev, filter_work);
 407         unsigned int filter = rt2x00dev->packet_filter;
 408
 409         /*
 410          * Since we had stored the filter inside rt2x00dev->packet_filter,
 411          * we should now clear that field. Otherwise the driver will
 412          * assume nothing has changed (*total_flags will be compared
 413          * to rt2x00dev->packet_filter to determine if any action is required).
 414          */
 415         rt2x00dev->packet_filter = 0;
 416
 417         rt2x00dev->ops->hw->configure_filter(rt2x00dev->hw,
 418                                              filter, &filter, 0, NULL);
 419 }
 420
 421 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 422                                           struct ieee80211_vif *vif)
 423 {
 424         struct rt2x00_dev *rt2x00dev = data;
 425         struct rt2x00_intf *intf = vif_to_intf(vif);
 426         struct sk_buff *skb;
 427         struct ieee80211_tx_control control;
 428         struct ieee80211_bss_conf conf;
 429         int delayed_flags;
 430
 431         /*
 432          * Copy all data we need during this action under the protection
 433          * of a spinlock. Otherwise race conditions might occur which results
 434          * into an invalid configuration.
 435          */
 436         spin_lock(&intf->lock);
 437
 438         memcpy(&conf, &intf->conf, sizeof(conf));
 439         delayed_flags = intf->delayed_flags;
 440         intf->delayed_flags = 0;
 441
 442         spin_unlock(&intf->lock);
 443
 444         if (delayed_flags & DELAYED_UPDATE_BEACON) {
 445                 skb = ieee80211_beacon_get(rt2x00dev->hw, vif, &control);
 446                 if (skb) {
 447                         rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, skb,
 448                                                           &control);
 449                         dev_kfree_skb(skb);
 450                 }
 451         }
 452
 453         if (delayed_flags & DELAYED_CONFIG_ERP)
 454                 rt2x00lib_config_erp(rt2x00dev, intf, &intf->conf);
 455
 456         if (delayed_flags & DELAYED_LED_ASSOC)
 457                 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
 458 }
 459
 460 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 461 {
 462         struct rt2x00_dev *rt2x00dev =
 463             container_of(work, struct rt2x00_dev, intf_work);
 464
 465         /*
 466          * Iterate over each interface and perform the
 467          * requested configurations.
 468          */
 469         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 470                                             rt2x00lib_intf_scheduled_iter,
 471                                             rt2x00dev);
 472 }
 473
 474 /*
 475  * Interrupt context handlers.
 476  */
 477 static void rt2x00lib_beacondone_iter(void *data, u8 *mac,
 478                                       struct ieee80211_vif *vif)
 479 {
 480         struct rt2x00_intf *intf = vif_to_intf(vif);
 481
 482         if (vif->type != IEEE80211_IF_TYPE_AP &&
 483             vif->type != IEEE80211_IF_TYPE_IBSS)
 484                 return;
 485
 486         spin_lock(&intf->lock);
 487         intf->delayed_flags |= DELAYED_UPDATE_BEACON;
 488         spin_unlock(&intf->lock);
 489 }
 490
 491 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 492 {
 493         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 494                 return;
 495
 496         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 497                                             rt2x00lib_beacondone_iter,
 498                                             rt2x00dev);
 499
 500         queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->intf_work);
 501 }
 502 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 503
 504 void rt2x00lib_txdone(struct queue_entry *entry,
 505                       struct txdone_entry_desc *txdesc)
 506 {
 507         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 508         struct skb_frame_desc *skbdesc;
 509         struct ieee80211_tx_status tx_status;
 510         int success = !!(txdesc->status == TX_SUCCESS ||
 511                          txdesc->status == TX_SUCCESS_RETRY);
 512         int fail = !!(txdesc->status == TX_FAIL_RETRY ||
 513                       txdesc->status == TX_FAIL_INVALID ||
 514                       txdesc->status == TX_FAIL_OTHER);
 515
 516         /*
 517          * Update TX statistics.
 518          */
 519         rt2x00dev->link.qual.tx_success += success;
 520         rt2x00dev->link.qual.tx_failed += txdesc->retry + fail;
 521
 522         /*
 523          * Initialize TX status
 524          */
 525         tx_status.flags = 0;
 526         tx_status.ack_signal = 0;
 527         tx_status.excessive_retries = (txdesc->status == TX_FAIL_RETRY);
 528         tx_status.retry_count = txdesc->retry;
 529         memcpy(&tx_status.control, txdesc->control, sizeof(*txdesc->control));
 530
 531         if (!(tx_status.control.flags & IEEE80211_TXCTL_NO_ACK)) {
 532                 if (success)
 533                         tx_status.flags |= IEEE80211_TX_STATUS_ACK;
 534                 else
 535                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 536         }
 537
 538         tx_status.queue_length = entry->queue->limit;
 539         tx_status.queue_number = tx_status.control.queue;
 540
 541         if (tx_status.control.flags & IEEE80211_TXCTL_USE_RTS_CTS) {
 542                 if (success)
 543                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 544                 else
 545                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 546         }
 547
 548         /*
 549          * Send the tx_status to debugfs. Only send the status report
 550          * to mac80211 when the frame originated from there. If this was
 551          * a extra frame coming through a mac80211 library call (RTS/CTS)
 552          * then we should not send the status report back.
 553          * If send to mac80211, mac80211 will clean up the skb structure,
 554          * otherwise we have to do it ourself.
 555          */
 556         skbdesc = get_skb_frame_desc(entry->skb);
 557         skbdesc->frame_type = DUMP_FRAME_TXDONE;
 558
 559         rt2x00debug_dump_frame(rt2x00dev, entry->skb);
 560
 561         if (!(skbdesc->flags & FRAME_DESC_DRIVER_GENERATED))
 562                 ieee80211_tx_status_irqsafe(rt2x00dev->hw,
 563                                             entry->skb, &tx_status);
 564         else
 565                 dev_kfree_skb(entry->skb);
 566         entry->skb = NULL;
 567 }
 568 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 569
 570 void rt2x00lib_rxdone(struct queue_entry *entry,
 571                       struct rxdone_entry_desc *rxdesc)
 572 {
 573         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 574         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 575         struct ieee80211_supported_band *sband;
 576         struct ieee80211_hdr *hdr;
 577         const struct rt2x00_rate *rate;
 578         unsigned int i;
 579         int idx = -1;
 580         u16 fc;
 581
 582         /*
 583          * Update RX statistics.
 584          */
 585         sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 586         for (i = 0; i < sband->n_bitrates; i++) {
 587                 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 588
 589                 if (((rxdesc->dev_flags & RXDONE_SIGNAL_PLCP) &&
 590                      (rate->plcp == rxdesc->signal)) ||
 591                     (!(rxdesc->dev_flags & RXDONE_SIGNAL_PLCP) &&
 592                       (rate->bitrate == rxdesc->signal))) {
 593                         idx = i;
 594                         break;
 595                 }
 596         }
 597
 598         if (idx < 0) {
 599                 WARNING(rt2x00dev, "Frame received with unrecognized signal,"
 600                         "signal=0x%.2x, plcp=%d.\n", rxdesc->signal,
 601                         !!(rxdesc->dev_flags & RXDONE_SIGNAL_PLCP));
 602                 idx = 0;
 603         }
 604
 605         /*
 606          * Only update link status if this is a beacon frame carrying our bssid.
 607          */
 608         hdr = (struct ieee80211_hdr *)entry->skb->data;
 609         fc = le16_to_cpu(hdr->frame_control);
 610         if (is_beacon(fc) && (rxdesc->dev_flags & RXDONE_MY_BSS))
 611                 rt2x00lib_update_link_stats(&rt2x00dev->link, rxdesc->rssi);
 612
 613         rt2x00dev->link.qual.rx_success++;
 614
 615         rx_status->rate_idx = idx;
 616         rx_status->signal =
 617             rt2x00lib_calculate_link_signal(rt2x00dev, rxdesc->rssi);
 618         rx_status->ssi = rxdesc->rssi;
 619         rx_status->flag = rxdesc->flags;
 620         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 621
 622         /*
 623          * Send frame to mac80211 & debugfs.
 624          * mac80211 will clean up the skb structure.
 625          */
 626         get_skb_frame_desc(entry->skb)->frame_type = DUMP_FRAME_RXDONE;
 627         rt2x00debug_dump_frame(rt2x00dev, entry->skb);
 628         ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb, rx_status);
 629         entry->skb = NULL;
 630 }
 631 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 632
 633 /*
 634  * TX descriptor initializer
 635  */
 636 void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 637                              struct sk_buff *skb,
 638                              struct ieee80211_tx_control *control)
 639 {
 640         struct txentry_desc txdesc;
 641         struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
 642         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skbdesc->data;
 643         const struct rt2x00_rate *rate;
 644         int tx_rate;
 645         int length;
 646         int duration;
 647         int residual;
 648         u16 frame_control;
 649         u16 seq_ctrl;
 650
 651         memset(&txdesc, 0, sizeof(txdesc));
 652
 653         txdesc.queue = skbdesc->entry->queue->qid;
 654         txdesc.cw_min = skbdesc->entry->queue->cw_min;
 655         txdesc.cw_max = skbdesc->entry->queue->cw_max;
 656         txdesc.aifs = skbdesc->entry->queue->aifs;
 657
 658         /*
 659          * Read required fields from ieee80211 header.
 660          */
 661         frame_control = le16_to_cpu(hdr->frame_control);
 662         seq_ctrl = le16_to_cpu(hdr->seq_ctrl);
 663
 664         tx_rate = control->tx_rate->hw_value;
 665
 666         /*
 667          * Check whether this frame is to be acked
 668          */
 669         if (!(control->flags & IEEE80211_TXCTL_NO_ACK))
 670                 __set_bit(ENTRY_TXD_ACK, &txdesc.flags);
 671
 672         /*
 673          * Check if this is a RTS/CTS frame
 674          */
 675         if (is_rts_frame(frame_control) || is_cts_frame(frame_control)) {
 676                 __set_bit(ENTRY_TXD_BURST, &txdesc.flags);
 677                 if (is_rts_frame(frame_control)) {
 678                         __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc.flags);
 679                         __set_bit(ENTRY_TXD_ACK, &txdesc.flags);
 680                 } else
 681                         __clear_bit(ENTRY_TXD_ACK, &txdesc.flags);
 682                 if (control->rts_cts_rate)
 683                         tx_rate = control->rts_cts_rate->hw_value;
 684         }
 685
 686         rate = rt2x00_get_rate(tx_rate);
 687
 688         /*
 689          * Check if more fragments are pending
 690          */
 691         if (ieee80211_get_morefrag(hdr)) {
 692                 __set_bit(ENTRY_TXD_BURST, &txdesc.flags);
 693                 __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc.flags);
 694         }
 695
 696         /*
 697          * Beacons and probe responses require the tsf timestamp
 698          * to be inserted into the frame.
 699          */
 700         if (control->queue == RT2X00_BCN_QUEUE_BEACON ||
 701             is_probe_resp(frame_control))
 702                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc.flags);
 703
 704         /*
 705          * Determine with what IFS priority this frame should be send.
 706          * Set ifs to IFS_SIFS when the this is not the first fragment,
 707          * or this fragment came after RTS/CTS.
 708          */
 709         if ((seq_ctrl & IEEE80211_SCTL_FRAG) > 0 ||
 710             test_bit(ENTRY_TXD_RTS_FRAME, &txdesc.flags))
 711                 txdesc.ifs = IFS_SIFS;
 712         else
 713                 txdesc.ifs = IFS_BACKOFF;
 714
 715         /*
 716          * PLCP setup
 717          * Length calculation depends on OFDM/CCK rate.
 718          */
 719         txdesc.signal = rate->plcp;
 720         txdesc.service = 0x04;
 721
 722         length = skbdesc->data_len + FCS_LEN;
 723         if (rate->flags & DEV_RATE_OFDM) {
 724                 __set_bit(ENTRY_TXD_OFDM_RATE, &txdesc.flags);
 725
 726                 txdesc.length_high = (length >> 6) & 0x3f;
 727                 txdesc.length_low = length & 0x3f;
 728         } else {
 729                 /*
 730                  * Convert length to microseconds.
 731                  */
 732                 residual = get_duration_res(length, rate->bitrate);
 733                 duration = get_duration(length, rate->bitrate);
 734
 735                 if (residual != 0) {
 736                         duration++;
 737
 738                         /*
 739                          * Check if we need to set the Length Extension
 740                          */
 741                         if (rate->bitrate == 110 && residual <= 30)
 742                                 txdesc.service |= 0x80;
 743                 }
 744
 745                 txdesc.length_high = (duration >> 8) & 0xff;
 746                 txdesc.length_low = duration & 0xff;
 747
 748                 /*
 749                  * When preamble is enabled we should set the
 750                  * preamble bit for the signal.
 751                  */
 752                 if (rt2x00_get_rate_preamble(tx_rate))
 753                         txdesc.signal |= 0x08;
 754         }
 755
 756         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, skb, &txdesc, control);
 757
 758         /*
 759          * Update queue entry.
 760          */
 761         skbdesc->entry->skb = skb;
 762
 763         /*
 764          * The frame has been completely initialized and ready
 765          * for sending to the device. The caller will push the
 766          * frame to the device, but we are going to push the
 767          * frame to debugfs here.
 768          */
 769         skbdesc->frame_type = DUMP_FRAME_TX;
 770         rt2x00debug_dump_frame(rt2x00dev, skb);
 771 }
 772 EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc);
 773
 774 /*
 775  * Driver initialization handlers.
 776  */
 777 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 778         {
 779                 .flags = DEV_RATE_CCK | DEV_RATE_BASIC,
 780                 .bitrate = 10,
 781                 .ratemask = BIT(0),
 782                 .plcp = 0x00,
 783         },
 784         {
 785                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 786                 .bitrate = 20,
 787                 .ratemask = BIT(1),
 788                 .plcp = 0x01,
 789         },
 790         {
 791                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 792                 .bitrate = 55,
 793                 .ratemask = BIT(2),
 794                 .plcp = 0x02,
 795         },
 796         {
 797                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 798                 .bitrate = 110,
 799                 .ratemask = BIT(3),
 800                 .plcp = 0x03,
 801         },
 802         {
 803                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 804                 .bitrate = 60,
 805                 .ratemask = BIT(4),
 806                 .plcp = 0x0b,
 807         },
 808         {
 809                 .flags = DEV_RATE_OFDM,
 810                 .bitrate = 90,
 811                 .ratemask = BIT(5),
 812                 .plcp = 0x0f,
 813         },
 814         {
 815                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 816                 .bitrate = 120,
 817                 .ratemask = BIT(6),
 818                 .plcp = 0x0a,
 819         },
 820         {
 821                 .flags = DEV_RATE_OFDM,
 822                 .bitrate = 180,
 823                 .ratemask = BIT(7),
 824                 .plcp = 0x0e,
 825         },
 826         {
 827                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 828                 .bitrate = 240,
 829                 .ratemask = BIT(8),
 830                 .plcp = 0x09,
 831         },
 832         {
 833                 .flags = DEV_RATE_OFDM,
 834                 .bitrate = 360,
 835                 .ratemask = BIT(9),
 836                 .plcp = 0x0d,
 837         },
 838         {
 839                 .flags = DEV_RATE_OFDM,
 840                 .bitrate = 480,
 841                 .ratemask = BIT(10),
 842                 .plcp = 0x08,
 843         },
 844         {
 845                 .flags = DEV_RATE_OFDM,
 846                 .bitrate = 540,
 847                 .ratemask = BIT(11),
 848                 .plcp = 0x0c,
 849         },
 850 };
 851
 852 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 853                               const int channel, const int tx_power,
 854                               const int value)
 855 {
 856         entry->center_freq = ieee80211_channel_to_frequency(channel);
 857         entry->hw_value = value;
 858         entry->max_power = tx_power;
 859         entry->max_antenna_gain = 0xff;
 860 }
 861
 862 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 863                            const u16 index, const struct rt2x00_rate *rate)
 864 {
 865         entry->flags = 0;
 866         entry->bitrate = rate->bitrate;
 867         entry->hw_value = rt2x00_create_rate_hw_value(index, 0);
 868         entry->hw_value_short = entry->hw_value;
 869
 870         if (rate->flags & DEV_RATE_SHORT_PREAMBLE) {
 871                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 872                 entry->hw_value_short |= rt2x00_create_rate_hw_value(index, 1);
 873         }
 874 }
 875
 876 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 877                                     struct hw_mode_spec *spec)
 878 {
 879         struct ieee80211_hw *hw = rt2x00dev->hw;
 880         struct ieee80211_channel *channels;
 881         struct ieee80211_rate *rates;
 882         unsigned int num_rates;
 883         unsigned int i;
 884         unsigned char tx_power;
 885
 886         num_rates = 0;
 887         if (spec->supported_rates & SUPPORT_RATE_CCK)
 888                 num_rates += 4;
 889         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 890                 num_rates += 8;
 891
 892         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 893         if (!channels)
 894                 return -ENOMEM;
 895
 896         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 897         if (!rates)
 898                 goto exit_free_channels;
 899
 900         /*
 901          * Initialize Rate list.
 902          */
 903         for (i = 0; i < num_rates; i++)
 904                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 905
 906         /*
 907          * Initialize Channel list.
 908          */
 909         for (i = 0; i < spec->num_channels; i++) {
 910                 if (spec->channels[i].channel <= 14) {
 911                         if (spec->tx_power_bg)
 912                                 tx_power = spec->tx_power_bg[i];
 913                         else
 914                                 tx_power = spec->tx_power_default;
 915                 } else {
 916                         if (spec->tx_power_a)
 917                                 tx_power = spec->tx_power_a[i];
 918                         else
 919                                 tx_power = spec->tx_power_default;
 920                 }
 921
 922                 rt2x00lib_channel(&channels[i],
 923                                   spec->channels[i].channel, tx_power, i);
 924         }
 925
 926         /*
 927          * Intitialize 802.11b, 802.11g
 928          * Rates: CCK, OFDM.
 929          * Channels: 2.4 GHz
 930          */
 931         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 932                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 933                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 934                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 935                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 936                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 937                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 938         }
 939
 940         /*
 941          * Intitialize 802.11a
 942          * Rates: OFDM.
 943          * Channels: OFDM, UNII, HiperLAN2.
 944          */
 945         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 946                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 947                     spec->num_channels - 14;
 948                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 949                     num_rates - 4;
 950                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 951                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 952                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 953                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 954         }
 955
 956         return 0;
 957
 958  exit_free_channels:
 959         kfree(channels);
 960         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 961         return -ENOMEM;
 962 }
 963
 964 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 965 {
 966         if (test_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags))
 967                 ieee80211_unregister_hw(rt2x00dev->hw);
 968
 969         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 970                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 971                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 972                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 973                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 974         }
 975 }
 976
 977 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 978 {
 979         struct hw_mode_spec *spec = &rt2x00dev->spec;
 980         int status;
 981
 982         /*
 983          * Initialize HW modes.
 984          */
 985         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 986         if (status)
 987                 return status;
 988
 989         /*
 990          * Register HW.
 991          */
 992         status = ieee80211_register_hw(rt2x00dev->hw);
 993         if (status) {
 994                 rt2x00lib_remove_hw(rt2x00dev);
 995                 return status;
 996         }
 997
 998         __set_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags);
 999
1000         return 0;
1001 }
1002
1003 /*
1004  * Initialization/uninitialization handlers.
1005  */
1006 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
1007 {
1008         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1009                 return;
1010
1011         /*
1012          * Unregister extra components.
1013          */
1014         rt2x00rfkill_unregister(rt2x00dev);
1015
1016         /*
1017          * Allow the HW to uninitialize.
1018          */
1019         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1020
1021         /*
1022          * Free allocated queue entries.
1023          */
1024         rt2x00queue_uninitialize(rt2x00dev);
1025 }
1026
1027 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1028 {
1029         int status;
1030
1031         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1032                 return 0;
1033
1034         /*
1035          * Allocate all queue entries.
1036          */
1037         status = rt2x00queue_initialize(rt2x00dev);
1038         if (status)
1039                 return status;
1040
1041         /*
1042          * Initialize the device.
1043          */
1044         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1045         if (status)
1046                 goto exit;
1047
1048         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
1049
1050         /*
1051          * Register the extra components.
1052          */
1053         rt2x00rfkill_register(rt2x00dev);
1054
1055         return 0;
1056
1057 exit:
1058         rt2x00lib_uninitialize(rt2x00dev);
1059
1060         return status;
1061 }
1062
1063 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1064 {
1065         int retval;
1066
1067         if (test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1068                 return 0;
1069
1070         /*
1071          * If this is the first interface which is added,
1072          * we should load the firmware now.
1073          */
1074         retval = rt2x00lib_load_firmware(rt2x00dev);
1075         if (retval)
1076                 return retval;
1077
1078         /*
1079          * Initialize the device.
1080          */
1081         retval = rt2x00lib_initialize(rt2x00dev);
1082         if (retval)
1083                 return retval;
1084
1085         /*
1086          * Enable radio.
1087          */
1088         retval = rt2x00lib_enable_radio(rt2x00dev);
1089         if (retval) {
1090                 rt2x00lib_uninitialize(rt2x00dev);
1091                 return retval;
1092         }
1093
1094         rt2x00dev->intf_ap_count = 0;
1095         rt2x00dev->intf_sta_count = 0;
1096         rt2x00dev->intf_associated = 0;
1097
1098         __set_bit(DEVICE_STARTED, &rt2x00dev->flags);
1099
1100         return 0;
1101 }
1102
1103 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1104 {
1105         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1106                 return;
1107
1108         /*
1109          * Perhaps we can add something smarter here,
1110          * but for now just disabling the radio should do.
1111          */
1112         rt2x00lib_disable_radio(rt2x00dev);
1113
1114         rt2x00dev->intf_ap_count = 0;
1115         rt2x00dev->intf_sta_count = 0;
1116         rt2x00dev->intf_associated = 0;
1117
1118         __clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
1119 }
1120
1121 /*
1122  * driver allocation handlers.
1123  */
1124 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1125 {
1126         int retval = -ENOMEM;
1127
1128         /*
1129          * Make room for rt2x00_intf inside the per-interface
1130          * structure ieee80211_vif.
1131          */
1132         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1133
1134         /*
1135          * Let the driver probe the device to detect the capabilities.
1136          */
1137         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1138         if (retval) {
1139                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1140                 goto exit;
1141         }
1142
1143         /*
1144          * Initialize configuration work.
1145          */
1146         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1147         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
1148         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
1149
1150         /*
1151          * Allocate queue array.
1152          */
1153         retval = rt2x00queue_allocate(rt2x00dev);
1154         if (retval)
1155                 goto exit;
1156
1157         /*
1158          * Initialize ieee80211 structure.
1159          */
1160         retval = rt2x00lib_probe_hw(rt2x00dev);
1161         if (retval) {
1162                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1163                 goto exit;
1164         }
1165
1166         /*
1167          * Register extra components.
1168          */
1169         rt2x00leds_register(rt2x00dev);
1170         rt2x00rfkill_allocate(rt2x00dev);
1171         rt2x00debug_register(rt2x00dev);
1172
1173         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1174
1175         return 0;
1176
1177 exit:
1178         rt2x00lib_remove_dev(rt2x00dev);
1179
1180         return retval;
1181 }
1182 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1183
1184 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1185 {
1186         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1187
1188         /*
1189          * Disable radio.
1190          */
1191         rt2x00lib_disable_radio(rt2x00dev);
1192
1193         /*
1194          * Uninitialize device.
1195          */
1196         rt2x00lib_uninitialize(rt2x00dev);
1197
1198         /*
1199          * Free extra components
1200          */
1201         rt2x00debug_deregister(rt2x00dev);
1202         rt2x00rfkill_free(rt2x00dev);
1203         rt2x00leds_unregister(rt2x00dev);
1204
1205         /*
1206          * Free ieee80211_hw memory.
1207          */
1208         rt2x00lib_remove_hw(rt2x00dev);
1209
1210         /*
1211          * Free firmware image.
1212          */
1213         rt2x00lib_free_firmware(rt2x00dev);
1214
1215         /*
1216          * Free queue structures.
1217          */
1218         rt2x00queue_free(rt2x00dev);
1219 }
1220 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1221
1222 /*
1223  * Device state handlers
1224  */
1225 #ifdef CONFIG_PM
1226 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1227 {
1228         int retval;
1229
1230         NOTICE(rt2x00dev, "Going to sleep.\n");
1231         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1232
1233         /*
1234          * Only continue if mac80211 has open interfaces.
1235          */
1236         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1237                 goto exit;
1238         __set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
1239
1240         /*
1241          * Disable radio.
1242          */
1243         rt2x00lib_stop(rt2x00dev);
1244         rt2x00lib_uninitialize(rt2x00dev);
1245
1246         /*
1247          * Suspend/disable extra components.
1248          */
1249         rt2x00leds_suspend(rt2x00dev);
1250         rt2x00rfkill_suspend(rt2x00dev);
1251         rt2x00debug_deregister(rt2x00dev);
1252
1253 exit:
1254         /*
1255          * Set device mode to sleep for power management,
1256          * on some hardware this call seems to consistently fail.
1257          * From the specifications it is hard to tell why it fails,
1258          * and if this is a "bad thing".
1259          * Overall it is safe to just ignore the failure and
1260          * continue suspending. The only downside is that the
1261          * device will not be in optimal power save mode, but with
1262          * the radio and the other components already disabled the
1263          * device is as good as disabled.
1264          */
1265         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1266         if (retval)
1267                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1268                         "continue suspending.\n");
1269
1270         return 0;
1271 }
1272 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1273
1274 static void rt2x00lib_resume_intf(void *data, u8 *mac,
1275                                   struct ieee80211_vif *vif)
1276 {
1277         struct rt2x00_dev *rt2x00dev = data;
1278         struct rt2x00_intf *intf = vif_to_intf(vif);
1279
1280         spin_lock(&intf->lock);
1281
1282         rt2x00lib_config_intf(rt2x00dev, intf,
1283                               vif->type, intf->mac, intf->bssid);
1284
1285
1286         /*
1287          * Master or Ad-hoc mode require a new beacon update.
1288          */
1289         if (vif->type == IEEE80211_IF_TYPE_AP ||
1290             vif->type == IEEE80211_IF_TYPE_IBSS)
1291                 intf->delayed_flags |= DELAYED_UPDATE_BEACON;
1292
1293         spin_unlock(&intf->lock);
1294 }
1295
1296 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1297 {
1298         int retval;
1299
1300         NOTICE(rt2x00dev, "Waking up.\n");
1301
1302         /*
1303          * Restore/enable extra components.
1304          */
1305         rt2x00debug_register(rt2x00dev);
1306         rt2x00rfkill_resume(rt2x00dev);
1307         rt2x00leds_resume(rt2x00dev);
1308
1309         /*
1310          * Only continue if mac80211 had open interfaces.
1311          */
1312         if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
1313                 return 0;
1314
1315         /*
1316          * Reinitialize device and all active interfaces.
1317          */
1318         retval = rt2x00lib_start(rt2x00dev);
1319         if (retval)
1320                 goto exit;
1321
1322         /*
1323          * Reconfigure device.
1324          */
1325         rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
1326         if (!rt2x00dev->hw->conf.radio_enabled)
1327                 rt2x00lib_disable_radio(rt2x00dev);
1328
1329         /*
1330          * Iterator over each active interface to
1331          * reconfigure the hardware.
1332          */
1333         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
1334                                             rt2x00lib_resume_intf, rt2x00dev);
1335
1336         /*
1337          * We are ready again to receive requests from mac80211.
1338          */
1339         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1340
1341         /*
1342          * It is possible that during that mac80211 has attempted
1343          * to send frames while we were suspending or resuming.
1344          * In that case we have disabled the TX queue and should
1345          * now enable it again
1346          */
1347         ieee80211_start_queues(rt2x00dev->hw);
1348
1349         /*
1350          * During interface iteration we might have changed the
1351          * delayed_flags, time to handles the event by calling
1352          * the work handler directly.
1353          */
1354         rt2x00lib_intf_scheduled(&rt2x00dev->intf_work);
1355
1356         return 0;
1357
1358 exit:
1359         rt2x00lib_disable_radio(rt2x00dev);
1360         rt2x00lib_uninitialize(rt2x00dev);
1361         rt2x00debug_deregister(rt2x00dev);
1362
1363         return retval;
1364 }
1365 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1366 #endif /* CONFIG_PM */
1367
1368 /*
1369  * rt2x00lib module information.
1370  */
1371 MODULE_AUTHOR(DRV_PROJECT);
1372 MODULE_VERSION(DRV_VERSION);
1373 MODULE_DESCRIPTION("rt2x00 library");
1374 MODULE_LICENSE("GPL");