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
  32 /*
  33  * Link tuning handlers
  34  */
  35 void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
  36 {
  37         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
  38                 return;
  39
  40         /*
  41          * Reset link information.
  42          * Both the currently active vgc level as well as
  43          * the link tuner counter should be reset. Resetting
  44          * the counter is important for devices where the
  45          * device should only perform link tuning during the
  46          * first minute after being enabled.
  47          */
  48         rt2x00dev->link.count = 0;
  49         rt2x00dev->link.vgc_level = 0;
  50
  51         /*
  52          * Reset the link tuner.
  53          */
  54         rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
  55 }
  56
  57 static void rt2x00lib_start_link_tuner(struct rt2x00_dev *rt2x00dev)
  58 {
  59         /*
  60          * Clear all (possibly) pre-existing quality statistics.
  61          */
  62         memset(&rt2x00dev->link.qual, 0, sizeof(rt2x00dev->link.qual));
  63
  64         /*
  65          * The RX and TX percentage should start at 50%
  66          * this will assure we will get at least get some
  67          * decent value when the link tuner starts.
  68          * The value will be dropped and overwritten with
  69          * the correct (measured )value anyway during the
  70          * first run of the link tuner.
  71          */
  72         rt2x00dev->link.qual.rx_percentage = 50;
  73         rt2x00dev->link.qual.tx_percentage = 50;
  74
  75         rt2x00lib_reset_link_tuner(rt2x00dev);
  76
  77         queue_delayed_work(rt2x00dev->hw->workqueue,
  78                            &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
  79 }
  80
  81 static void rt2x00lib_stop_link_tuner(struct rt2x00_dev *rt2x00dev)
  82 {
  83         cancel_delayed_work_sync(&rt2x00dev->link.work);
  84 }
  85
  86 /*
  87  * Radio control handlers.
  88  */
  89 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  90 {
  91         int status;
  92
  93         /*
  94          * Don't enable the radio twice.
  95          * And check if the hardware button has been disabled.
  96          */
  97         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
  98             test_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags))
  99                 return 0;
 100
 101         /*
 102          * Initialize all data queues.
 103          */
 104         rt2x00queue_init_rx(rt2x00dev);
 105         rt2x00queue_init_tx(rt2x00dev);
 106
 107         /*
 108          * Enable radio.
 109          */
 110         status =
 111             rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
 112         if (status)
 113                 return status;
 114
 115         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
 116
 117         rt2x00leds_led_radio(rt2x00dev, true);
 118         rt2x00led_led_activity(rt2x00dev, true);
 119
 120         __set_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags);
 121
 122         /*
 123          * Enable RX.
 124          */
 125         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 126
 127         /*
 128          * Start the TX queues.
 129          */
 130         ieee80211_wake_queues(rt2x00dev->hw);
 131
 132         return 0;
 133 }
 134
 135 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
 136 {
 137         if (!__test_and_clear_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 138                 return;
 139
 140         /*
 141          * Stop all scheduled work.
 142          */
 143         if (work_pending(&rt2x00dev->intf_work))
 144                 cancel_work_sync(&rt2x00dev->intf_work);
 145         if (work_pending(&rt2x00dev->filter_work))
 146                 cancel_work_sync(&rt2x00dev->filter_work);
 147
 148         /*
 149          * Stop the TX queues.
 150          */
 151         ieee80211_stop_queues(rt2x00dev->hw);
 152
 153         /*
 154          * Disable RX.
 155          */
 156         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 157
 158         /*
 159          * Disable radio.
 160          */
 161         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 162         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 163         rt2x00led_led_activity(rt2x00dev, false);
 164         rt2x00leds_led_radio(rt2x00dev, false);
 165 }
 166
 167 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 168 {
 169         /*
 170          * When we are disabling the RX, we should also stop the link tuner.
 171          */
 172         if (state == STATE_RADIO_RX_OFF)
 173                 rt2x00lib_stop_link_tuner(rt2x00dev);
 174
 175         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 176
 177         /*
 178          * When we are enabling the RX, we should also start the link tuner.
 179          */
 180         if (state == STATE_RADIO_RX_ON &&
 181             (rt2x00dev->intf_ap_count || rt2x00dev->intf_sta_count))
 182                 rt2x00lib_start_link_tuner(rt2x00dev);
 183 }
 184
 185 static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev *rt2x00dev)
 186 {
 187         enum antenna rx = rt2x00dev->link.ant.active.rx;
 188         enum antenna tx = rt2x00dev->link.ant.active.tx;
 189         int sample_a =
 190             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_A);
 191         int sample_b =
 192             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_B);
 193
 194         /*
 195          * We are done sampling. Now we should evaluate the results.
 196          */
 197         rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
 198
 199         /*
 200          * During the last period we have sampled the RSSI
 201          * from both antenna's. It now is time to determine
 202          * which antenna demonstrated the best performance.
 203          * When we are already on the antenna with the best
 204          * performance, then there really is nothing for us
 205          * left to do.
 206          */
 207         if (sample_a == sample_b)
 208                 return;
 209
 210         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 211                 rx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 212
 213         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 214                 tx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 215
 216         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 217 }
 218
 219 static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
 220 {
 221         enum antenna rx = rt2x00dev->link.ant.active.rx;
 222         enum antenna tx = rt2x00dev->link.ant.active.tx;
 223         int rssi_curr = rt2x00_get_link_ant_rssi(&rt2x00dev->link);
 224         int rssi_old = rt2x00_update_ant_rssi(&rt2x00dev->link, rssi_curr);
 225
 226         /*
 227          * Legacy driver indicates that we should swap antenna's
 228          * when the difference in RSSI is greater that 5. This
 229          * also should be done when the RSSI was actually better
 230          * then the previous sample.
 231          * When the difference exceeds the threshold we should
 232          * sample the rssi from the other antenna to make a valid
 233          * comparison between the 2 antennas.
 234          */
 235         if (abs(rssi_curr - rssi_old) < 5)
 236                 return;
 237
 238         rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;
 239
 240         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 241                 rx = (rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 242
 243         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 244                 tx = (tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 245
 246         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 247 }
 248
 249 static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
 250 {
 251         /*
 252          * Determine if software diversity is enabled for
 253          * either the TX or RX antenna (or both).
 254          * Always perform this check since within the link
 255          * tuner interval the configuration might have changed.
 256          */
 257         rt2x00dev->link.ant.flags &= ~ANTENNA_RX_DIVERSITY;
 258         rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;
 259
 260         if (rt2x00dev->hw->conf.antenna_sel_rx == 0 &&
 261             rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY)
 262                 rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
 263         if (rt2x00dev->hw->conf.antenna_sel_tx == 0 &&
 264             rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY)
 265                 rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;
 266
 267         if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&
 268             !(rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)) {
 269                 rt2x00dev->link.ant.flags = 0;
 270                 return;
 271         }
 272
 273         /*
 274          * If we have only sampled the data over the last period
 275          * we should now harvest the data. Otherwise just evaluate
 276          * the data. The latter should only be performed once
 277          * every 2 seconds.
 278          */
 279         if (rt2x00dev->link.ant.flags & ANTENNA_MODE_SAMPLE)
 280                 rt2x00lib_evaluate_antenna_sample(rt2x00dev);
 281         else if (rt2x00dev->link.count & 1)
 282                 rt2x00lib_evaluate_antenna_eval(rt2x00dev);
 283 }
 284
 285 static void rt2x00lib_update_link_stats(struct link *link, int rssi)
 286 {
 287         int avg_rssi = rssi;
 288
 289         /*
 290          * Update global RSSI
 291          */
 292         if (link->qual.avg_rssi)
 293                 avg_rssi = MOVING_AVERAGE(link->qual.avg_rssi, rssi, 8);
 294         link->qual.avg_rssi = avg_rssi;
 295
 296         /*
 297          * Update antenna RSSI
 298          */
 299         if (link->ant.rssi_ant)
 300                 rssi = MOVING_AVERAGE(link->ant.rssi_ant, rssi, 8);
 301         link->ant.rssi_ant = rssi;
 302 }
 303
 304 static void rt2x00lib_precalculate_link_signal(struct link_qual *qual)
 305 {
 306         if (qual->rx_failed || qual->rx_success)
 307                 qual->rx_percentage =
 308                     (qual->rx_success * 100) /
 309                     (qual->rx_failed + qual->rx_success);
 310         else
 311                 qual->rx_percentage = 50;
 312
 313         if (qual->tx_failed || qual->tx_success)
 314                 qual->tx_percentage =
 315                     (qual->tx_success * 100) /
 316                     (qual->tx_failed + qual->tx_success);
 317         else
 318                 qual->tx_percentage = 50;
 319
 320         qual->rx_success = 0;
 321         qual->rx_failed = 0;
 322         qual->tx_success = 0;
 323         qual->tx_failed = 0;
 324 }
 325
 326 static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
 327                                            int rssi)
 328 {
 329         int rssi_percentage = 0;
 330         int signal;
 331
 332         /*
 333          * We need a positive value for the RSSI.
 334          */
 335         if (rssi < 0)
 336                 rssi += rt2x00dev->rssi_offset;
 337
 338         /*
 339          * Calculate the different percentages,
 340          * which will be used for the signal.
 341          */
 342         if (rt2x00dev->rssi_offset)
 343                 rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
 344
 345         /*
 346          * Add the individual percentages and use the WEIGHT
 347          * defines to calculate the current link signal.
 348          */
 349         signal = ((WEIGHT_RSSI * rssi_percentage) +
 350                   (WEIGHT_TX * rt2x00dev->link.qual.tx_percentage) +
 351                   (WEIGHT_RX * rt2x00dev->link.qual.rx_percentage)) / 100;
 352
 353         return (signal > 100) ? 100 : signal;
 354 }
 355
 356 static void rt2x00lib_link_tuner(struct work_struct *work)
 357 {
 358         struct rt2x00_dev *rt2x00dev =
 359             container_of(work, struct rt2x00_dev, link.work.work);
 360
 361         /*
 362          * When the radio is shutting down we should
 363          * immediately cease all link tuning.
 364          */
 365         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 366                 return;
 367
 368         /*
 369          * Update statistics.
 370          */
 371         rt2x00dev->ops->lib->link_stats(rt2x00dev, &rt2x00dev->link.qual);
 372         rt2x00dev->low_level_stats.dot11FCSErrorCount +=
 373             rt2x00dev->link.qual.rx_failed;
 374
 375         /*
 376          * Only perform the link tuning when Link tuning
 377          * has been enabled (This could have been disabled from the EEPROM).
 378          */
 379         if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
 380                 rt2x00dev->ops->lib->link_tuner(rt2x00dev);
 381
 382         /*
 383          * Precalculate a portion of the link signal which is
 384          * in based on the tx/rx success/failure counters.
 385          */
 386         rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
 387
 388         /*
 389          * Send a signal to the led to update the led signal strength.
 390          */
 391         rt2x00leds_led_quality(rt2x00dev, rt2x00dev->link.qual.avg_rssi);
 392
 393         /*
 394          * Evaluate antenna setup, make this the last step since this could
 395          * possibly reset some statistics.
 396          */
 397         rt2x00lib_evaluate_antenna(rt2x00dev);
 398
 399         /*
 400          * Increase tuner counter, and reschedule the next link tuner run.
 401          */
 402         rt2x00dev->link.count++;
 403         queue_delayed_work(rt2x00dev->hw->workqueue, &rt2x00dev->link.work,
 404                            LINK_TUNE_INTERVAL);
 405 }
 406
 407 static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
 408 {
 409         struct rt2x00_dev *rt2x00dev =
 410             container_of(work, struct rt2x00_dev, filter_work);
 411
 412         rt2x00dev->ops->lib->config_filter(rt2x00dev, rt2x00dev->packet_filter);
 413 }
 414
 415 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 416                                           struct ieee80211_vif *vif)
 417 {
 418         struct rt2x00_dev *rt2x00dev = data;
 419         struct rt2x00_intf *intf = vif_to_intf(vif);
 420         struct sk_buff *skb;
 421         struct ieee80211_bss_conf conf;
 422         int delayed_flags;
 423
 424         /*
 425          * Copy all data we need during this action under the protection
 426          * of a spinlock. Otherwise race conditions might occur which results
 427          * into an invalid configuration.
 428          */
 429         spin_lock(&intf->lock);
 430
 431         memcpy(&conf, &intf->conf, sizeof(conf));
 432         delayed_flags = intf->delayed_flags;
 433         intf->delayed_flags = 0;
 434
 435         spin_unlock(&intf->lock);
 436
 437         if (delayed_flags & DELAYED_UPDATE_BEACON) {
 438                 skb = ieee80211_beacon_get(rt2x00dev->hw, vif);
 439                 if (skb &&
 440                     rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, skb))
 441                         dev_kfree_skb(skb);
 442         }
 443
 444         if (delayed_flags & DELAYED_CONFIG_ERP)
 445                 rt2x00lib_config_erp(rt2x00dev, intf, &intf->conf);
 446
 447         if (delayed_flags & DELAYED_LED_ASSOC)
 448                 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
 449 }
 450
 451 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 452 {
 453         struct rt2x00_dev *rt2x00dev =
 454             container_of(work, struct rt2x00_dev, intf_work);
 455
 456         /*
 457          * Iterate over each interface and perform the
 458          * requested configurations.
 459          */
 460         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 461                                             rt2x00lib_intf_scheduled_iter,
 462                                             rt2x00dev);
 463 }
 464
 465 /*
 466  * Interrupt context handlers.
 467  */
 468 static void rt2x00lib_beacondone_iter(void *data, u8 *mac,
 469                                       struct ieee80211_vif *vif)
 470 {
 471         struct rt2x00_intf *intf = vif_to_intf(vif);
 472
 473         if (vif->type != IEEE80211_IF_TYPE_AP &&
 474             vif->type != IEEE80211_IF_TYPE_IBSS)
 475                 return;
 476
 477         spin_lock(&intf->lock);
 478         intf->delayed_flags |= DELAYED_UPDATE_BEACON;
 479         spin_unlock(&intf->lock);
 480 }
 481
 482 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 483 {
 484         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 485                 return;
 486
 487         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 488                                                    rt2x00lib_beacondone_iter,
 489                                                    rt2x00dev);
 490
 491         queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->intf_work);
 492 }
 493 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 494
 495 void rt2x00lib_txdone(struct queue_entry *entry,
 496                       struct txdone_entry_desc *txdesc)
 497 {
 498         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 499         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 500
 501         /*
 502          * Send frame to debugfs immediately, after this call is completed
 503          * we are going to overwrite the skb->cb array.
 504          */
 505         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 506
 507         /*
 508          * Update TX statistics.
 509          */
 510         rt2x00dev->link.qual.tx_success +=
 511             test_bit(TXDONE_SUCCESS, &txdesc->flags);
 512         rt2x00dev->link.qual.tx_failed +=
 513             test_bit(TXDONE_FAILURE, &txdesc->flags);
 514
 515         /*
 516          * Initialize TX status
 517          */
 518         memset(&tx_info->status, 0, sizeof(tx_info->status));
 519         tx_info->status.ack_signal = 0;
 520         tx_info->status.excessive_retries =
 521             test_bit(TXDONE_EXCESSIVE_RETRY, &txdesc->flags);
 522         tx_info->status.retry_count = txdesc->retry;
 523
 524         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 525                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 526                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 527                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 528                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 529         }
 530
 531         if (tx_info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) {
 532                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 533                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 534                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 535                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 536         }
 537
 538         /*
 539          * Only send the status report to mac80211 when TX status was
 540          * requested by it. If this was a extra frame coming through
 541          * a mac80211 library call (RTS/CTS) then we should not send the
 542          * status report back.
 543          */
 544         if (tx_info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)
 545                 ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb);
 546         else
 547                 dev_kfree_skb_irq(entry->skb);
 548         entry->skb = NULL;
 549 }
 550 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 551
 552 void rt2x00lib_rxdone(struct queue_entry *entry,
 553                       struct rxdone_entry_desc *rxdesc)
 554 {
 555         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 556         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 557         unsigned int header_size = ieee80211_get_hdrlen_from_skb(entry->skb);
 558         struct ieee80211_supported_band *sband;
 559         struct ieee80211_hdr *hdr;
 560         const struct rt2x00_rate *rate;
 561         unsigned int align;
 562         unsigned int i;
 563         int idx = -1;
 564         u16 fc;
 565
 566         /*
 567          * The data behind the ieee80211 header must be
 568          * aligned on a 4 byte boundary.
 569          */
 570         align = ((unsigned long)(entry->skb->data + header_size)) & 3;
 571
 572         if (align) {
 573                 skb_push(entry->skb, align);
 574                 /* Move entire frame in 1 command */
 575                 memmove(entry->skb->data, entry->skb->data + align,
 576                         rxdesc->size);
 577         }
 578
 579         /* Update data pointers, trim buffer to correct size */
 580         skb_trim(entry->skb, rxdesc->size);
 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->qual =
 617             rt2x00lib_calculate_link_signal(rt2x00dev, rxdesc->rssi);
 618         rx_status->signal = 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         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 627         ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb, rx_status);
 628         entry->skb = NULL;
 629 }
 630 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 631
 632 /*
 633  * Driver initialization handlers.
 634  */
 635 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 636         {
 637                 .flags = DEV_RATE_CCK | DEV_RATE_BASIC,
 638                 .bitrate = 10,
 639                 .ratemask = BIT(0),
 640                 .plcp = 0x00,
 641         },
 642         {
 643                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 644                 .bitrate = 20,
 645                 .ratemask = BIT(1),
 646                 .plcp = 0x01,
 647         },
 648         {
 649                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 650                 .bitrate = 55,
 651                 .ratemask = BIT(2),
 652                 .plcp = 0x02,
 653         },
 654         {
 655                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 656                 .bitrate = 110,
 657                 .ratemask = BIT(3),
 658                 .plcp = 0x03,
 659         },
 660         {
 661                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 662                 .bitrate = 60,
 663                 .ratemask = BIT(4),
 664                 .plcp = 0x0b,
 665         },
 666         {
 667                 .flags = DEV_RATE_OFDM,
 668                 .bitrate = 90,
 669                 .ratemask = BIT(5),
 670                 .plcp = 0x0f,
 671         },
 672         {
 673                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 674                 .bitrate = 120,
 675                 .ratemask = BIT(6),
 676                 .plcp = 0x0a,
 677         },
 678         {
 679                 .flags = DEV_RATE_OFDM,
 680                 .bitrate = 180,
 681                 .ratemask = BIT(7),
 682                 .plcp = 0x0e,
 683         },
 684         {
 685                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 686                 .bitrate = 240,
 687                 .ratemask = BIT(8),
 688                 .plcp = 0x09,
 689         },
 690         {
 691                 .flags = DEV_RATE_OFDM,
 692                 .bitrate = 360,
 693                 .ratemask = BIT(9),
 694                 .plcp = 0x0d,
 695         },
 696         {
 697                 .flags = DEV_RATE_OFDM,
 698                 .bitrate = 480,
 699                 .ratemask = BIT(10),
 700                 .plcp = 0x08,
 701         },
 702         {
 703                 .flags = DEV_RATE_OFDM,
 704                 .bitrate = 540,
 705                 .ratemask = BIT(11),
 706                 .plcp = 0x0c,
 707         },
 708 };
 709
 710 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 711                               const int channel, const int tx_power,
 712                               const int value)
 713 {
 714         entry->center_freq = ieee80211_channel_to_frequency(channel);
 715         entry->hw_value = value;
 716         entry->max_power = tx_power;
 717         entry->max_antenna_gain = 0xff;
 718 }
 719
 720 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 721                            const u16 index, const struct rt2x00_rate *rate)
 722 {
 723         entry->flags = 0;
 724         entry->bitrate = rate->bitrate;
 725         entry->hw_value = rt2x00_create_rate_hw_value(index, 0);
 726         entry->hw_value_short = entry->hw_value;
 727
 728         if (rate->flags & DEV_RATE_SHORT_PREAMBLE) {
 729                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 730                 entry->hw_value_short |= rt2x00_create_rate_hw_value(index, 1);
 731         }
 732 }
 733
 734 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 735                                     struct hw_mode_spec *spec)
 736 {
 737         struct ieee80211_hw *hw = rt2x00dev->hw;
 738         struct ieee80211_channel *channels;
 739         struct ieee80211_rate *rates;
 740         unsigned int num_rates;
 741         unsigned int i;
 742         unsigned char tx_power;
 743
 744         num_rates = 0;
 745         if (spec->supported_rates & SUPPORT_RATE_CCK)
 746                 num_rates += 4;
 747         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 748                 num_rates += 8;
 749
 750         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 751         if (!channels)
 752                 return -ENOMEM;
 753
 754         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 755         if (!rates)
 756                 goto exit_free_channels;
 757
 758         /*
 759          * Initialize Rate list.
 760          */
 761         for (i = 0; i < num_rates; i++)
 762                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 763
 764         /*
 765          * Initialize Channel list.
 766          */
 767         for (i = 0; i < spec->num_channels; i++) {
 768                 if (spec->channels[i].channel <= 14) {
 769                         if (spec->tx_power_bg)
 770                                 tx_power = spec->tx_power_bg[i];
 771                         else
 772                                 tx_power = spec->tx_power_default;
 773                 } else {
 774                         if (spec->tx_power_a)
 775                                 tx_power = spec->tx_power_a[i];
 776                         else
 777                                 tx_power = spec->tx_power_default;
 778                 }
 779
 780                 rt2x00lib_channel(&channels[i],
 781                                   spec->channels[i].channel, tx_power, i);
 782         }
 783
 784         /*
 785          * Intitialize 802.11b, 802.11g
 786          * Rates: CCK, OFDM.
 787          * Channels: 2.4 GHz
 788          */
 789         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 790                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 791                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 792                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 793                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 794                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 795                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 796         }
 797
 798         /*
 799          * Intitialize 802.11a
 800          * Rates: OFDM.
 801          * Channels: OFDM, UNII, HiperLAN2.
 802          */
 803         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 804                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 805                     spec->num_channels - 14;
 806                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 807                     num_rates - 4;
 808                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 809                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 810                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 811                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 812         }
 813
 814         return 0;
 815
 816  exit_free_channels:
 817         kfree(channels);
 818         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 819         return -ENOMEM;
 820 }
 821
 822 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 823 {
 824         if (test_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags))
 825                 ieee80211_unregister_hw(rt2x00dev->hw);
 826
 827         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 828                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 829                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 830                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 831                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 832         }
 833 }
 834
 835 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 836 {
 837         struct hw_mode_spec *spec = &rt2x00dev->spec;
 838         int status;
 839
 840         /*
 841          * Initialize HW modes.
 842          */
 843         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 844         if (status)
 845                 return status;
 846
 847         /*
 848          * Initialize HW fields.
 849          */
 850         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 851
 852         /*
 853          * Register HW.
 854          */
 855         status = ieee80211_register_hw(rt2x00dev->hw);
 856         if (status) {
 857                 rt2x00lib_remove_hw(rt2x00dev);
 858                 return status;
 859         }
 860
 861         __set_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags);
 862
 863         return 0;
 864 }
 865
 866 /*
 867  * Initialization/uninitialization handlers.
 868  */
 869 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 870 {
 871         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 872                 return;
 873
 874         /*
 875          * Unregister extra components.
 876          */
 877         rt2x00rfkill_unregister(rt2x00dev);
 878
 879         /*
 880          * Allow the HW to uninitialize.
 881          */
 882         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 883
 884         /*
 885          * Free allocated queue entries.
 886          */
 887         rt2x00queue_uninitialize(rt2x00dev);
 888 }
 889
 890 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 891 {
 892         int status;
 893
 894         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 895                 return 0;
 896
 897         /*
 898          * Allocate all queue entries.
 899          */
 900         status = rt2x00queue_initialize(rt2x00dev);
 901         if (status)
 902                 return status;
 903
 904         /*
 905          * Initialize the device.
 906          */
 907         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 908         if (status) {
 909                 rt2x00queue_uninitialize(rt2x00dev);
 910                 return status;
 911         }
 912
 913         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
 914
 915         /*
 916          * Register the extra components.
 917          */
 918         rt2x00rfkill_register(rt2x00dev);
 919
 920         return 0;
 921 }
 922
 923 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 924 {
 925         int retval;
 926
 927         if (test_bit(DEVICE_STARTED, &rt2x00dev->flags))
 928                 return 0;
 929
 930         /*
 931          * If this is the first interface which is added,
 932          * we should load the firmware now.
 933          */
 934         retval = rt2x00lib_load_firmware(rt2x00dev);
 935         if (retval)
 936                 return retval;
 937
 938         /*
 939          * Initialize the device.
 940          */
 941         retval = rt2x00lib_initialize(rt2x00dev);
 942         if (retval)
 943                 return retval;
 944
 945         /*
 946          * Enable radio.
 947          */
 948         retval = rt2x00lib_enable_radio(rt2x00dev);
 949         if (retval) {
 950                 rt2x00lib_uninitialize(rt2x00dev);
 951                 return retval;
 952         }
 953
 954         rt2x00dev->intf_ap_count = 0;
 955         rt2x00dev->intf_sta_count = 0;
 956         rt2x00dev->intf_associated = 0;
 957
 958         __set_bit(DEVICE_STARTED, &rt2x00dev->flags);
 959
 960         return 0;
 961 }
 962
 963 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
 964 {
 965         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
 966                 return;
 967
 968         /*
 969          * Perhaps we can add something smarter here,
 970          * but for now just disabling the radio should do.
 971          */
 972         rt2x00lib_disable_radio(rt2x00dev);
 973
 974         rt2x00dev->intf_ap_count = 0;
 975         rt2x00dev->intf_sta_count = 0;
 976         rt2x00dev->intf_associated = 0;
 977
 978         __clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
 979 }
 980
 981 /*
 982  * driver allocation handlers.
 983  */
 984 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 985 {
 986         int retval = -ENOMEM;
 987
 988         /*
 989          * Make room for rt2x00_intf inside the per-interface
 990          * structure ieee80211_vif.
 991          */
 992         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
 993
 994         /*
 995          * Let the driver probe the device to detect the capabilities.
 996          */
 997         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
 998         if (retval) {
 999                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1000                 goto exit;
1001         }
1002
1003         /*
1004          * Initialize configuration work.
1005          */
1006         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1007         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
1008         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
1009
1010         /*
1011          * Allocate queue array.
1012          */
1013         retval = rt2x00queue_allocate(rt2x00dev);
1014         if (retval)
1015                 goto exit;
1016
1017         /*
1018          * Initialize ieee80211 structure.
1019          */
1020         retval = rt2x00lib_probe_hw(rt2x00dev);
1021         if (retval) {
1022                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1023                 goto exit;
1024         }
1025
1026         /*
1027          * Register extra components.
1028          */
1029         rt2x00leds_register(rt2x00dev);
1030         rt2x00rfkill_allocate(rt2x00dev);
1031         rt2x00debug_register(rt2x00dev);
1032
1033         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1034
1035         return 0;
1036
1037 exit:
1038         rt2x00lib_remove_dev(rt2x00dev);
1039
1040         return retval;
1041 }
1042 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1043
1044 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1045 {
1046         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1047
1048         /*
1049          * Disable radio.
1050          */
1051         rt2x00lib_disable_radio(rt2x00dev);
1052
1053         /*
1054          * Uninitialize device.
1055          */
1056         rt2x00lib_uninitialize(rt2x00dev);
1057
1058         /*
1059          * Free extra components
1060          */
1061         rt2x00debug_deregister(rt2x00dev);
1062         rt2x00rfkill_free(rt2x00dev);
1063         rt2x00leds_unregister(rt2x00dev);
1064
1065         /*
1066          * Free ieee80211_hw memory.
1067          */
1068         rt2x00lib_remove_hw(rt2x00dev);
1069
1070         /*
1071          * Free firmware image.
1072          */
1073         rt2x00lib_free_firmware(rt2x00dev);
1074
1075         /*
1076          * Free queue structures.
1077          */
1078         rt2x00queue_free(rt2x00dev);
1079 }
1080 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1081
1082 /*
1083  * Device state handlers
1084  */
1085 #ifdef CONFIG_PM
1086 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1087 {
1088         int retval;
1089
1090         NOTICE(rt2x00dev, "Going to sleep.\n");
1091         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1092
1093         /*
1094          * Only continue if mac80211 has open interfaces.
1095          */
1096         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1097                 goto exit;
1098         __set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
1099
1100         /*
1101          * Disable radio.
1102          */
1103         rt2x00lib_stop(rt2x00dev);
1104         rt2x00lib_uninitialize(rt2x00dev);
1105
1106         /*
1107          * Suspend/disable extra components.
1108          */
1109         rt2x00leds_suspend(rt2x00dev);
1110         rt2x00rfkill_suspend(rt2x00dev);
1111         rt2x00debug_deregister(rt2x00dev);
1112
1113 exit:
1114         /*
1115          * Set device mode to sleep for power management,
1116          * on some hardware this call seems to consistently fail.
1117          * From the specifications it is hard to tell why it fails,
1118          * and if this is a "bad thing".
1119          * Overall it is safe to just ignore the failure and
1120          * continue suspending. The only downside is that the
1121          * device will not be in optimal power save mode, but with
1122          * the radio and the other components already disabled the
1123          * device is as good as disabled.
1124          */
1125         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1126         if (retval)
1127                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1128                         "continue suspending.\n");
1129
1130         return 0;
1131 }
1132 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1133
1134 static void rt2x00lib_resume_intf(void *data, u8 *mac,
1135                                   struct ieee80211_vif *vif)
1136 {
1137         struct rt2x00_dev *rt2x00dev = data;
1138         struct rt2x00_intf *intf = vif_to_intf(vif);
1139
1140         spin_lock(&intf->lock);
1141
1142         rt2x00lib_config_intf(rt2x00dev, intf,
1143                               vif->type, intf->mac, intf->bssid);
1144
1145
1146         /*
1147          * Master or Ad-hoc mode require a new beacon update.
1148          */
1149         if (vif->type == IEEE80211_IF_TYPE_AP ||
1150             vif->type == IEEE80211_IF_TYPE_IBSS)
1151                 intf->delayed_flags |= DELAYED_UPDATE_BEACON;
1152
1153         spin_unlock(&intf->lock);
1154 }
1155
1156 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1157 {
1158         int retval;
1159
1160         NOTICE(rt2x00dev, "Waking up.\n");
1161
1162         /*
1163          * Restore/enable extra components.
1164          */
1165         rt2x00debug_register(rt2x00dev);
1166         rt2x00rfkill_resume(rt2x00dev);
1167         rt2x00leds_resume(rt2x00dev);
1168
1169         /*
1170          * Only continue if mac80211 had open interfaces.
1171          */
1172         if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
1173                 return 0;
1174
1175         /*
1176          * Reinitialize device and all active interfaces.
1177          */
1178         retval = rt2x00lib_start(rt2x00dev);
1179         if (retval)
1180                 goto exit;
1181
1182         /*
1183          * Reconfigure device.
1184          */
1185         rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
1186         if (!rt2x00dev->hw->conf.radio_enabled)
1187                 rt2x00lib_disable_radio(rt2x00dev);
1188
1189         /*
1190          * Iterator over each active interface to
1191          * reconfigure the hardware.
1192          */
1193         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
1194                                             rt2x00lib_resume_intf, rt2x00dev);
1195
1196         /*
1197          * We are ready again to receive requests from mac80211.
1198          */
1199         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1200
1201         /*
1202          * It is possible that during that mac80211 has attempted
1203          * to send frames while we were suspending or resuming.
1204          * In that case we have disabled the TX queue and should
1205          * now enable it again
1206          */
1207         ieee80211_wake_queues(rt2x00dev->hw);
1208
1209         /*
1210          * During interface iteration we might have changed the
1211          * delayed_flags, time to handles the event by calling
1212          * the work handler directly.
1213          */
1214         rt2x00lib_intf_scheduled(&rt2x00dev->intf_work);
1215
1216         return 0;
1217
1218 exit:
1219         rt2x00lib_disable_radio(rt2x00dev);
1220         rt2x00lib_uninitialize(rt2x00dev);
1221         rt2x00debug_deregister(rt2x00dev);
1222
1223         return retval;
1224 }
1225 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1226 #endif /* CONFIG_PM */
1227
1228 /*
1229  * rt2x00lib module information.
1230  */
1231 MODULE_AUTHOR(DRV_PROJECT);
1232 MODULE_VERSION(DRV_VERSION);
1233 MODULE_DESCRIPTION("rt2x00 library");
1234 MODULE_LICENSE("GPL");