err.no Git - linux-2.6/blob - 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         struct ieee80211_supported_band *sband;
 558         struct ieee80211_hdr *hdr;
 559         const struct rt2x00_rate *rate;
 560         unsigned int i;
 561         int idx = -1;
 562         u16 fc;
 563
 564         /*
 565          * Update RX statistics.
 566          */
 567         sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 568         for (i = 0; i < sband->n_bitrates; i++) {
 569                 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 570
 571                 if (((rxdesc->dev_flags & RXDONE_SIGNAL_PLCP) &&
 572                      (rate->plcp == rxdesc->signal)) ||
 573                     (!(rxdesc->dev_flags & RXDONE_SIGNAL_PLCP) &&
 574                       (rate->bitrate == rxdesc->signal))) {
 575                         idx = i;
 576                         break;
 577                 }
 578         }
 579
 580         if (idx < 0) {
 581                 WARNING(rt2x00dev, "Frame received with unrecognized signal,"
 582                         "signal=0x%.2x, plcp=%d.\n", rxdesc->signal,
 583                         !!(rxdesc->dev_flags & RXDONE_SIGNAL_PLCP));
 584                 idx = 0;
 585         }
 586
 587         /*
 588          * Only update link status if this is a beacon frame carrying our bssid.
 589          */
 590         hdr = (struct ieee80211_hdr *)entry->skb->data;
 591         fc = le16_to_cpu(hdr->frame_control);
 592         if (is_beacon(fc) && (rxdesc->dev_flags & RXDONE_MY_BSS))
 593                 rt2x00lib_update_link_stats(&rt2x00dev->link, rxdesc->rssi);
 594
 595         rt2x00dev->link.qual.rx_success++;
 596
 597         rx_status->rate_idx = idx;
 598         rx_status->qual =
 599             rt2x00lib_calculate_link_signal(rt2x00dev, rxdesc->rssi);
 600         rx_status->signal = rxdesc->rssi;
 601         rx_status->flag = rxdesc->flags;
 602         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 603
 604         /*
 605          * Send frame to mac80211 & debugfs.
 606          * mac80211 will clean up the skb structure.
 607          */
 608         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 609         ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb, rx_status);
 610         entry->skb = NULL;
 611 }
 612 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 613
 614 /*
 615  * Driver initialization handlers.
 616  */
 617 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 618         {
 619                 .flags = DEV_RATE_CCK | DEV_RATE_BASIC,
 620                 .bitrate = 10,
 621                 .ratemask = BIT(0),
 622                 .plcp = 0x00,
 623         },
 624         {
 625                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 626                 .bitrate = 20,
 627                 .ratemask = BIT(1),
 628                 .plcp = 0x01,
 629         },
 630         {
 631                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 632                 .bitrate = 55,
 633                 .ratemask = BIT(2),
 634                 .plcp = 0x02,
 635         },
 636         {
 637                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 638                 .bitrate = 110,
 639                 .ratemask = BIT(3),
 640                 .plcp = 0x03,
 641         },
 642         {
 643                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 644                 .bitrate = 60,
 645                 .ratemask = BIT(4),
 646                 .plcp = 0x0b,
 647         },
 648         {
 649                 .flags = DEV_RATE_OFDM,
 650                 .bitrate = 90,
 651                 .ratemask = BIT(5),
 652                 .plcp = 0x0f,
 653         },
 654         {
 655                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 656                 .bitrate = 120,
 657                 .ratemask = BIT(6),
 658                 .plcp = 0x0a,
 659         },
 660         {
 661                 .flags = DEV_RATE_OFDM,
 662                 .bitrate = 180,
 663                 .ratemask = BIT(7),
 664                 .plcp = 0x0e,
 665         },
 666         {
 667                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 668                 .bitrate = 240,
 669                 .ratemask = BIT(8),
 670                 .plcp = 0x09,
 671         },
 672         {
 673                 .flags = DEV_RATE_OFDM,
 674                 .bitrate = 360,
 675                 .ratemask = BIT(9),
 676                 .plcp = 0x0d,
 677         },
 678         {
 679                 .flags = DEV_RATE_OFDM,
 680                 .bitrate = 480,
 681                 .ratemask = BIT(10),
 682                 .plcp = 0x08,
 683         },
 684         {
 685                 .flags = DEV_RATE_OFDM,
 686                 .bitrate = 540,
 687                 .ratemask = BIT(11),
 688                 .plcp = 0x0c,
 689         },
 690 };
 691
 692 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 693                               const int channel, const int tx_power,
 694                               const int value)
 695 {
 696         entry->center_freq = ieee80211_channel_to_frequency(channel);
 697         entry->hw_value = value;
 698         entry->max_power = tx_power;
 699         entry->max_antenna_gain = 0xff;
 700 }
 701
 702 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 703                            const u16 index, const struct rt2x00_rate *rate)
 704 {
 705         entry->flags = 0;
 706         entry->bitrate = rate->bitrate;
 707         entry->hw_value = rt2x00_create_rate_hw_value(index, 0);
 708         entry->hw_value_short = entry->hw_value;
 709
 710         if (rate->flags & DEV_RATE_SHORT_PREAMBLE) {
 711                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 712                 entry->hw_value_short |= rt2x00_create_rate_hw_value(index, 1);
 713         }
 714 }
 715
 716 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 717                                     struct hw_mode_spec *spec)
 718 {
 719         struct ieee80211_hw *hw = rt2x00dev->hw;
 720         struct ieee80211_channel *channels;
 721         struct ieee80211_rate *rates;
 722         unsigned int num_rates;
 723         unsigned int i;
 724         unsigned char tx_power;
 725
 726         num_rates = 0;
 727         if (spec->supported_rates & SUPPORT_RATE_CCK)
 728                 num_rates += 4;
 729         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 730                 num_rates += 8;
 731
 732         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 733         if (!channels)
 734                 return -ENOMEM;
 735
 736         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 737         if (!rates)
 738                 goto exit_free_channels;
 739
 740         /*
 741          * Initialize Rate list.
 742          */
 743         for (i = 0; i < num_rates; i++)
 744                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 745
 746         /*
 747          * Initialize Channel list.
 748          */
 749         for (i = 0; i < spec->num_channels; i++) {
 750                 if (spec->channels[i].channel <= 14) {
 751                         if (spec->tx_power_bg)
 752                                 tx_power = spec->tx_power_bg[i];
 753                         else
 754                                 tx_power = spec->tx_power_default;
 755                 } else {
 756                         if (spec->tx_power_a)
 757                                 tx_power = spec->tx_power_a[i];
 758                         else
 759                                 tx_power = spec->tx_power_default;
 760                 }
 761
 762                 rt2x00lib_channel(&channels[i],
 763                                   spec->channels[i].channel, tx_power, i);
 764         }
 765
 766         /*
 767          * Intitialize 802.11b, 802.11g
 768          * Rates: CCK, OFDM.
 769          * Channels: 2.4 GHz
 770          */
 771         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 772                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 773                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 774                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 775                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 776                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 777                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 778         }
 779
 780         /*
 781          * Intitialize 802.11a
 782          * Rates: OFDM.
 783          * Channels: OFDM, UNII, HiperLAN2.
 784          */
 785         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 786                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 787                     spec->num_channels - 14;
 788                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 789                     num_rates - 4;
 790                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 791                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 792                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 793                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 794         }
 795
 796         return 0;
 797
 798  exit_free_channels:
 799         kfree(channels);
 800         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 801         return -ENOMEM;
 802 }
 803
 804 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 805 {
 806         if (test_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags))
 807                 ieee80211_unregister_hw(rt2x00dev->hw);
 808
 809         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 810                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 811                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 812                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 813                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 814         }
 815 }
 816
 817 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 818 {
 819         struct hw_mode_spec *spec = &rt2x00dev->spec;
 820         int status;
 821
 822         /*
 823          * Initialize HW modes.
 824          */
 825         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 826         if (status)
 827                 return status;
 828
 829         /*
 830          * Initialize HW fields.
 831          */
 832         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 833
 834         /*
 835          * Register HW.
 836          */
 837         status = ieee80211_register_hw(rt2x00dev->hw);
 838         if (status) {
 839                 rt2x00lib_remove_hw(rt2x00dev);
 840                 return status;
 841         }
 842
 843         __set_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags);
 844
 845         return 0;
 846 }
 847
 848 /*
 849  * Initialization/uninitialization handlers.
 850  */
 851 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 852 {
 853         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 854                 return;
 855
 856         /*
 857          * Unregister extra components.
 858          */
 859         rt2x00rfkill_unregister(rt2x00dev);
 860
 861         /*
 862          * Allow the HW to uninitialize.
 863          */
 864         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 865
 866         /*
 867          * Free allocated queue entries.
 868          */
 869         rt2x00queue_uninitialize(rt2x00dev);
 870 }
 871
 872 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 873 {
 874         int status;
 875
 876         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 877                 return 0;
 878
 879         /*
 880          * Allocate all queue entries.
 881          */
 882         status = rt2x00queue_initialize(rt2x00dev);
 883         if (status)
 884                 return status;
 885
 886         /*
 887          * Initialize the device.
 888          */
 889         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 890         if (status) {
 891                 rt2x00queue_uninitialize(rt2x00dev);
 892                 return status;
 893         }
 894
 895         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
 896
 897         /*
 898          * Register the extra components.
 899          */
 900         rt2x00rfkill_register(rt2x00dev);
 901
 902         return 0;
 903 }
 904
 905 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 906 {
 907         int retval;
 908
 909         if (test_bit(DEVICE_STARTED, &rt2x00dev->flags))
 910                 return 0;
 911
 912         /*
 913          * If this is the first interface which is added,
 914          * we should load the firmware now.
 915          */
 916         retval = rt2x00lib_load_firmware(rt2x00dev);
 917         if (retval)
 918                 return retval;
 919
 920         /*
 921          * Initialize the device.
 922          */
 923         retval = rt2x00lib_initialize(rt2x00dev);
 924         if (retval)
 925                 return retval;
 926
 927         /*
 928          * Enable radio.
 929          */
 930         retval = rt2x00lib_enable_radio(rt2x00dev);
 931         if (retval) {
 932                 rt2x00lib_uninitialize(rt2x00dev);
 933                 return retval;
 934         }
 935
 936         rt2x00dev->intf_ap_count = 0;
 937         rt2x00dev->intf_sta_count = 0;
 938         rt2x00dev->intf_associated = 0;
 939
 940         __set_bit(DEVICE_STARTED, &rt2x00dev->flags);
 941
 942         return 0;
 943 }
 944
 945 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
 946 {
 947         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
 948                 return;
 949
 950         /*
 951          * Perhaps we can add something smarter here,
 952          * but for now just disabling the radio should do.
 953          */
 954         rt2x00lib_disable_radio(rt2x00dev);
 955
 956         rt2x00dev->intf_ap_count = 0;
 957         rt2x00dev->intf_sta_count = 0;
 958         rt2x00dev->intf_associated = 0;
 959
 960         __clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
 961 }
 962
 963 /*
 964  * driver allocation handlers.
 965  */
 966 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 967 {
 968         int retval = -ENOMEM;
 969
 970         /*
 971          * Make room for rt2x00_intf inside the per-interface
 972          * structure ieee80211_vif.
 973          */
 974         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
 975
 976         /*
 977          * Let the driver probe the device to detect the capabilities.
 978          */
 979         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
 980         if (retval) {
 981                 ERROR(rt2x00dev, "Failed to allocate device.\n");
 982                 goto exit;
 983         }
 984
 985         /*
 986          * Initialize configuration work.
 987          */
 988         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
 989         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
 990         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
 991
 992         /*
 993          * Allocate queue array.
 994          */
 995         retval = rt2x00queue_allocate(rt2x00dev);
 996         if (retval)
 997                 goto exit;
 998
 999         /*
1000          * Initialize ieee80211 structure.
1001          */
1002         retval = rt2x00lib_probe_hw(rt2x00dev);
1003         if (retval) {
1004                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1005                 goto exit;
1006         }
1007
1008         /*
1009          * Register extra components.
1010          */
1011         rt2x00leds_register(rt2x00dev);
1012         rt2x00rfkill_allocate(rt2x00dev);
1013         rt2x00debug_register(rt2x00dev);
1014
1015         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1016
1017         return 0;
1018
1019 exit:
1020         rt2x00lib_remove_dev(rt2x00dev);
1021
1022         return retval;
1023 }
1024 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1025
1026 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1027 {
1028         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1029
1030         /*
1031          * Disable radio.
1032          */
1033         rt2x00lib_disable_radio(rt2x00dev);
1034
1035         /*
1036          * Uninitialize device.
1037          */
1038         rt2x00lib_uninitialize(rt2x00dev);
1039
1040         /*
1041          * Free extra components
1042          */
1043         rt2x00debug_deregister(rt2x00dev);
1044         rt2x00rfkill_free(rt2x00dev);
1045         rt2x00leds_unregister(rt2x00dev);
1046
1047         /*
1048          * Free ieee80211_hw memory.
1049          */
1050         rt2x00lib_remove_hw(rt2x00dev);
1051
1052         /*
1053          * Free firmware image.
1054          */
1055         rt2x00lib_free_firmware(rt2x00dev);
1056
1057         /*
1058          * Free queue structures.
1059          */
1060         rt2x00queue_free(rt2x00dev);
1061 }
1062 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1063
1064 /*
1065  * Device state handlers
1066  */
1067 #ifdef CONFIG_PM
1068 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1069 {
1070         int retval;
1071
1072         NOTICE(rt2x00dev, "Going to sleep.\n");
1073         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1074
1075         /*
1076          * Only continue if mac80211 has open interfaces.
1077          */
1078         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1079                 goto exit;
1080         __set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
1081
1082         /*
1083          * Disable radio.
1084          */
1085         rt2x00lib_stop(rt2x00dev);
1086         rt2x00lib_uninitialize(rt2x00dev);
1087
1088         /*
1089          * Suspend/disable extra components.
1090          */
1091         rt2x00leds_suspend(rt2x00dev);
1092         rt2x00rfkill_suspend(rt2x00dev);
1093         rt2x00debug_deregister(rt2x00dev);
1094
1095 exit:
1096         /*
1097          * Set device mode to sleep for power management,
1098          * on some hardware this call seems to consistently fail.
1099          * From the specifications it is hard to tell why it fails,
1100          * and if this is a "bad thing".
1101          * Overall it is safe to just ignore the failure and
1102          * continue suspending. The only downside is that the
1103          * device will not be in optimal power save mode, but with
1104          * the radio and the other components already disabled the
1105          * device is as good as disabled.
1106          */
1107         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1108         if (retval)
1109                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1110                         "continue suspending.\n");
1111
1112         return 0;
1113 }
1114 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1115
1116 static void rt2x00lib_resume_intf(void *data, u8 *mac,
1117                                   struct ieee80211_vif *vif)
1118 {
1119         struct rt2x00_dev *rt2x00dev = data;
1120         struct rt2x00_intf *intf = vif_to_intf(vif);
1121
1122         spin_lock(&intf->lock);
1123
1124         rt2x00lib_config_intf(rt2x00dev, intf,
1125                               vif->type, intf->mac, intf->bssid);
1126
1127
1128         /*
1129          * Master or Ad-hoc mode require a new beacon update.
1130          */
1131         if (vif->type == IEEE80211_IF_TYPE_AP ||
1132             vif->type == IEEE80211_IF_TYPE_IBSS)
1133                 intf->delayed_flags |= DELAYED_UPDATE_BEACON;
1134
1135         spin_unlock(&intf->lock);
1136 }
1137
1138 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1139 {
1140         int retval;
1141
1142         NOTICE(rt2x00dev, "Waking up.\n");
1143
1144         /*
1145          * Restore/enable extra components.
1146          */
1147         rt2x00debug_register(rt2x00dev);
1148         rt2x00rfkill_resume(rt2x00dev);
1149         rt2x00leds_resume(rt2x00dev);
1150
1151         /*
1152          * Only continue if mac80211 had open interfaces.
1153          */
1154         if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
1155                 return 0;
1156
1157         /*
1158          * Reinitialize device and all active interfaces.
1159          */
1160         retval = rt2x00lib_start(rt2x00dev);
1161         if (retval)
1162                 goto exit;
1163
1164         /*
1165          * Reconfigure device.
1166          */
1167         rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
1168         if (!rt2x00dev->hw->conf.radio_enabled)
1169                 rt2x00lib_disable_radio(rt2x00dev);
1170
1171         /*
1172          * Iterator over each active interface to
1173          * reconfigure the hardware.
1174          */
1175         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
1176                                             rt2x00lib_resume_intf, rt2x00dev);
1177
1178         /*
1179          * We are ready again to receive requests from mac80211.
1180          */
1181         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1182
1183         /*
1184          * It is possible that during that mac80211 has attempted
1185          * to send frames while we were suspending or resuming.
1186          * In that case we have disabled the TX queue and should
1187          * now enable it again
1188          */
1189         ieee80211_wake_queues(rt2x00dev->hw);
1190
1191         /*
1192          * During interface iteration we might have changed the
1193          * delayed_flags, time to handles the event by calling
1194          * the work handler directly.
1195          */
1196         rt2x00lib_intf_scheduled(&rt2x00dev->intf_work);
1197
1198         return 0;
1199
1200 exit:
1201         rt2x00lib_disable_radio(rt2x00dev);
1202         rt2x00lib_uninitialize(rt2x00dev);
1203         rt2x00debug_deregister(rt2x00dev);
1204
1205         return retval;
1206 }
1207 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1208 #endif /* CONFIG_PM */
1209
1210 /*
1211  * rt2x00lib module information.
1212  */
1213 MODULE_AUTHOR(DRV_PROJECT);
1214 MODULE_VERSION(DRV_VERSION);
1215 MODULE_DESCRIPTION("rt2x00 library");
1216 MODULE_LICENSE("GPL");