SAFE public projects git trees. - safe/jmp/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->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 the TX queues.
 142          */
 143         ieee80211_stop_queues(rt2x00dev->hw);
 144
 145         /*
 146          * Disable RX.
 147          */
 148         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 149
 150         /*
 151          * Disable radio.
 152          */
 153         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 154         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 155         rt2x00led_led_activity(rt2x00dev, false);
 156         rt2x00leds_led_radio(rt2x00dev, false);
 157 }
 158
 159 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 160 {
 161         /*
 162          * When we are disabling the RX, we should also stop the link tuner.
 163          */
 164         if (state == STATE_RADIO_RX_OFF)
 165                 rt2x00lib_stop_link_tuner(rt2x00dev);
 166
 167         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 168
 169         /*
 170          * When we are enabling the RX, we should also start the link tuner.
 171          */
 172         if (state == STATE_RADIO_RX_ON &&
 173             (rt2x00dev->intf_ap_count || rt2x00dev->intf_sta_count))
 174                 rt2x00lib_start_link_tuner(rt2x00dev);
 175 }
 176
 177 static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev *rt2x00dev)
 178 {
 179         enum antenna rx = rt2x00dev->link.ant.active.rx;
 180         enum antenna tx = rt2x00dev->link.ant.active.tx;
 181         int sample_a =
 182             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_A);
 183         int sample_b =
 184             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_B);
 185
 186         /*
 187          * We are done sampling. Now we should evaluate the results.
 188          */
 189         rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
 190
 191         /*
 192          * During the last period we have sampled the RSSI
 193          * from both antenna's. It now is time to determine
 194          * which antenna demonstrated the best performance.
 195          * When we are already on the antenna with the best
 196          * performance, then there really is nothing for us
 197          * left to do.
 198          */
 199         if (sample_a == sample_b)
 200                 return;
 201
 202         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 203                 rx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 204
 205         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 206                 tx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 207
 208         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 209 }
 210
 211 static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
 212 {
 213         enum antenna rx = rt2x00dev->link.ant.active.rx;
 214         enum antenna tx = rt2x00dev->link.ant.active.tx;
 215         int rssi_curr = rt2x00_get_link_ant_rssi(&rt2x00dev->link);
 216         int rssi_old = rt2x00_update_ant_rssi(&rt2x00dev->link, rssi_curr);
 217
 218         /*
 219          * Legacy driver indicates that we should swap antenna's
 220          * when the difference in RSSI is greater that 5. This
 221          * also should be done when the RSSI was actually better
 222          * then the previous sample.
 223          * When the difference exceeds the threshold we should
 224          * sample the rssi from the other antenna to make a valid
 225          * comparison between the 2 antennas.
 226          */
 227         if (abs(rssi_curr - rssi_old) < 5)
 228                 return;
 229
 230         rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;
 231
 232         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 233                 rx = (rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 234
 235         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 236                 tx = (tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 237
 238         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 239 }
 240
 241 static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
 242 {
 243         /*
 244          * Determine if software diversity is enabled for
 245          * either the TX or RX antenna (or both).
 246          * Always perform this check since within the link
 247          * tuner interval the configuration might have changed.
 248          */
 249         rt2x00dev->link.ant.flags &= ~ANTENNA_RX_DIVERSITY;
 250         rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;
 251
 252         if (rt2x00dev->hw->conf.antenna_sel_rx == 0 &&
 253             rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY)
 254                 rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
 255         if (rt2x00dev->hw->conf.antenna_sel_tx == 0 &&
 256             rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY)
 257                 rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;
 258
 259         if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&
 260             !(rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)) {
 261                 rt2x00dev->link.ant.flags = 0;
 262                 return;
 263         }
 264
 265         /*
 266          * If we have only sampled the data over the last period
 267          * we should now harvest the data. Otherwise just evaluate
 268          * the data. The latter should only be performed once
 269          * every 2 seconds.
 270          */
 271         if (rt2x00dev->link.ant.flags & ANTENNA_MODE_SAMPLE)
 272                 rt2x00lib_evaluate_antenna_sample(rt2x00dev);
 273         else if (rt2x00dev->link.count & 1)
 274                 rt2x00lib_evaluate_antenna_eval(rt2x00dev);
 275 }
 276
 277 static void rt2x00lib_update_link_stats(struct link *link, int rssi)
 278 {
 279         int avg_rssi = rssi;
 280
 281         /*
 282          * Update global RSSI
 283          */
 284         if (link->qual.avg_rssi)
 285                 avg_rssi = MOVING_AVERAGE(link->qual.avg_rssi, rssi, 8);
 286         link->qual.avg_rssi = avg_rssi;
 287
 288         /*
 289          * Update antenna RSSI
 290          */
 291         if (link->ant.rssi_ant)
 292                 rssi = MOVING_AVERAGE(link->ant.rssi_ant, rssi, 8);
 293         link->ant.rssi_ant = rssi;
 294 }
 295
 296 static void rt2x00lib_precalculate_link_signal(struct link_qual *qual)
 297 {
 298         if (qual->rx_failed || qual->rx_success)
 299                 qual->rx_percentage =
 300                     (qual->rx_success * 100) /
 301                     (qual->rx_failed + qual->rx_success);
 302         else
 303                 qual->rx_percentage = 50;
 304
 305         if (qual->tx_failed || qual->tx_success)
 306                 qual->tx_percentage =
 307                     (qual->tx_success * 100) /
 308                     (qual->tx_failed + qual->tx_success);
 309         else
 310                 qual->tx_percentage = 50;
 311
 312         qual->rx_success = 0;
 313         qual->rx_failed = 0;
 314         qual->tx_success = 0;
 315         qual->tx_failed = 0;
 316 }
 317
 318 static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
 319                                            int rssi)
 320 {
 321         int rssi_percentage = 0;
 322         int signal;
 323
 324         /*
 325          * We need a positive value for the RSSI.
 326          */
 327         if (rssi < 0)
 328                 rssi += rt2x00dev->rssi_offset;
 329
 330         /*
 331          * Calculate the different percentages,
 332          * which will be used for the signal.
 333          */
 334         if (rt2x00dev->rssi_offset)
 335                 rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
 336
 337         /*
 338          * Add the individual percentages and use the WEIGHT
 339          * defines to calculate the current link signal.
 340          */
 341         signal = ((WEIGHT_RSSI * rssi_percentage) +
 342                   (WEIGHT_TX * rt2x00dev->link.qual.tx_percentage) +
 343                   (WEIGHT_RX * rt2x00dev->link.qual.rx_percentage)) / 100;
 344
 345         return (signal > 100) ? 100 : signal;
 346 }
 347
 348 static void rt2x00lib_link_tuner(struct work_struct *work)
 349 {
 350         struct rt2x00_dev *rt2x00dev =
 351             container_of(work, struct rt2x00_dev, link.work.work);
 352
 353         /*
 354          * When the radio is shutting down we should
 355          * immediately cease all link tuning.
 356          */
 357         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 358                 return;
 359
 360         /*
 361          * Update statistics.
 362          */
 363         rt2x00dev->ops->lib->link_stats(rt2x00dev, &rt2x00dev->link.qual);
 364         rt2x00dev->low_level_stats.dot11FCSErrorCount +=
 365             rt2x00dev->link.qual.rx_failed;
 366
 367         /*
 368          * Only perform the link tuning when Link tuning
 369          * has been enabled (This could have been disabled from the EEPROM).
 370          */
 371         if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
 372                 rt2x00dev->ops->lib->link_tuner(rt2x00dev);
 373
 374         /*
 375          * Precalculate a portion of the link signal which is
 376          * in based on the tx/rx success/failure counters.
 377          */
 378         rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
 379
 380         /*
 381          * Send a signal to the led to update the led signal strength.
 382          */
 383         rt2x00leds_led_quality(rt2x00dev, rt2x00dev->link.qual.avg_rssi);
 384
 385         /*
 386          * Evaluate antenna setup, make this the last step since this could
 387          * possibly reset some statistics.
 388          */
 389         rt2x00lib_evaluate_antenna(rt2x00dev);
 390
 391         /*
 392          * Increase tuner counter, and reschedule the next link tuner run.
 393          */
 394         rt2x00dev->link.count++;
 395         queue_delayed_work(rt2x00dev->workqueue,
 396                            &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
 397 }
 398
 399 static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
 400 {
 401         struct rt2x00_dev *rt2x00dev =
 402             container_of(work, struct rt2x00_dev, filter_work);
 403
 404         rt2x00dev->ops->lib->config_filter(rt2x00dev, rt2x00dev->packet_filter);
 405 }
 406
 407 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 408                                           struct ieee80211_vif *vif)
 409 {
 410         struct rt2x00_dev *rt2x00dev = data;
 411         struct rt2x00_intf *intf = vif_to_intf(vif);
 412         struct sk_buff *skb;
 413         struct ieee80211_bss_conf conf;
 414         int delayed_flags;
 415
 416         /*
 417          * Copy all data we need during this action under the protection
 418          * of a spinlock. Otherwise race conditions might occur which results
 419          * into an invalid configuration.
 420          */
 421         spin_lock(&intf->lock);
 422
 423         memcpy(&conf, &intf->conf, sizeof(conf));
 424         delayed_flags = intf->delayed_flags;
 425         intf->delayed_flags = 0;
 426
 427         spin_unlock(&intf->lock);
 428
 429         /*
 430          * It is possible the radio was disabled while the work had been
 431          * scheduled. If that happens we should return here immediately,
 432          * note that in the spinlock protected area above the delayed_flags
 433          * have been cleared correctly.
 434          */
 435         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 436                 return;
 437
 438         if (delayed_flags & DELAYED_UPDATE_BEACON) {
 439                 skb = ieee80211_beacon_get(rt2x00dev->hw, vif);
 440                 if (skb &&
 441                     rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, skb))
 442                         dev_kfree_skb(skb);
 443         }
 444
 445         if (delayed_flags & DELAYED_CONFIG_ERP)
 446                 rt2x00lib_config_erp(rt2x00dev, intf, &conf);
 447
 448         if (delayed_flags & DELAYED_LED_ASSOC)
 449                 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
 450 }
 451
 452 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 453 {
 454         struct rt2x00_dev *rt2x00dev =
 455             container_of(work, struct rt2x00_dev, intf_work);
 456
 457         /*
 458          * Iterate over each interface and perform the
 459          * requested configurations.
 460          */
 461         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 462                                             rt2x00lib_intf_scheduled_iter,
 463                                             rt2x00dev);
 464 }
 465
 466 /*
 467  * Interrupt context handlers.
 468  */
 469 static void rt2x00lib_beacondone_iter(void *data, u8 *mac,
 470                                       struct ieee80211_vif *vif)
 471 {
 472         struct rt2x00_intf *intf = vif_to_intf(vif);
 473
 474         if (vif->type != IEEE80211_IF_TYPE_AP &&
 475             vif->type != IEEE80211_IF_TYPE_IBSS)
 476                 return;
 477
 478         spin_lock(&intf->lock);
 479         intf->delayed_flags |= DELAYED_UPDATE_BEACON;
 480         spin_unlock(&intf->lock);
 481 }
 482
 483 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 484 {
 485         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 486                 return;
 487
 488         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 489                                                    rt2x00lib_beacondone_iter,
 490                                                    rt2x00dev);
 491
 492         queue_work(rt2x00dev->workqueue, &rt2x00dev->intf_work);
 493 }
 494 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 495
 496 void rt2x00lib_txdone(struct queue_entry *entry,
 497                       struct txdone_entry_desc *txdesc)
 498 {
 499         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 500         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 501
 502         /*
 503          * Send frame to debugfs immediately, after this call is completed
 504          * we are going to overwrite the skb->cb array.
 505          */
 506         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 507
 508         /*
 509          * Update TX statistics.
 510          */
 511         rt2x00dev->link.qual.tx_success +=
 512             test_bit(TXDONE_SUCCESS, &txdesc->flags);
 513         rt2x00dev->link.qual.tx_failed +=
 514             test_bit(TXDONE_FAILURE, &txdesc->flags);
 515
 516         /*
 517          * Initialize TX status
 518          */
 519         memset(&tx_info->status, 0, sizeof(tx_info->status));
 520         tx_info->status.ack_signal = 0;
 521         tx_info->status.excessive_retries =
 522             test_bit(TXDONE_EXCESSIVE_RETRY, &txdesc->flags);
 523         tx_info->status.retry_count = txdesc->retry;
 524
 525         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 526                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 527                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 528                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 529                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 530         }
 531
 532         if (tx_info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) {
 533                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 534                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 535                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 536                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 537         }
 538
 539         /*
 540          * Only send the status report to mac80211 when TX status was
 541          * requested by it. If this was a extra frame coming through
 542          * a mac80211 library call (RTS/CTS) then we should not send the
 543          * status report back.
 544          */
 545         if (tx_info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)
 546                 ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb);
 547         else
 548                 dev_kfree_skb_irq(entry->skb);
 549         entry->skb = NULL;
 550 }
 551 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 552
 553 void rt2x00lib_rxdone(struct queue_entry *entry,
 554                       struct rxdone_entry_desc *rxdesc)
 555 {
 556         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 557         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 558         unsigned int header_size = ieee80211_get_hdrlen_from_skb(entry->skb);
 559         struct ieee80211_supported_band *sband;
 560         struct ieee80211_hdr *hdr;
 561         const struct rt2x00_rate *rate;
 562         unsigned int align;
 563         unsigned int i;
 564         int idx = -1;
 565         u16 fc;
 566
 567         /*
 568          * The data behind the ieee80211 header must be
 569          * aligned on a 4 byte boundary.
 570          */
 571         align = ((unsigned long)(entry->skb->data + header_size)) & 3;
 572
 573         if (align) {
 574                 skb_push(entry->skb, align);
 575                 /* Move entire frame in 1 command */
 576                 memmove(entry->skb->data, entry->skb->data + align,
 577                         rxdesc->size);
 578         }
 579
 580         /* Update data pointers, trim buffer to correct size */
 581         skb_trim(entry->skb, rxdesc->size);
 582
 583         /*
 584          * Update RX statistics.
 585          */
 586         sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 587         for (i = 0; i < sband->n_bitrates; i++) {
 588                 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 589
 590                 if (((rxdesc->dev_flags & RXDONE_SIGNAL_PLCP) &&
 591                      (rate->plcp == rxdesc->signal)) ||
 592                     (!(rxdesc->dev_flags & RXDONE_SIGNAL_PLCP) &&
 593                       (rate->bitrate == rxdesc->signal))) {
 594                         idx = i;
 595                         break;
 596                 }
 597         }
 598
 599         if (idx < 0) {
 600                 WARNING(rt2x00dev, "Frame received with unrecognized signal,"
 601                         "signal=0x%.2x, plcp=%d.\n", rxdesc->signal,
 602                         !!(rxdesc->dev_flags & RXDONE_SIGNAL_PLCP));
 603                 idx = 0;
 604         }
 605
 606         /*
 607          * Only update link status if this is a beacon frame carrying our bssid.
 608          */
 609         hdr = (struct ieee80211_hdr *)entry->skb->data;
 610         fc = le16_to_cpu(hdr->frame_control);
 611         if (is_beacon(fc) && (rxdesc->dev_flags & RXDONE_MY_BSS))
 612                 rt2x00lib_update_link_stats(&rt2x00dev->link, rxdesc->rssi);
 613
 614         rt2x00dev->link.qual.rx_success++;
 615
 616         rx_status->rate_idx = idx;
 617         rx_status->qual =
 618             rt2x00lib_calculate_link_signal(rt2x00dev, rxdesc->rssi);
 619         rx_status->signal = rxdesc->rssi;
 620         rx_status->flag = rxdesc->flags;
 621         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 622
 623         /*
 624          * Send frame to mac80211 & debugfs.
 625          * mac80211 will clean up the skb structure.
 626          */
 627         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, 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  * Driver initialization handlers.
 635  */
 636 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 637         {
 638                 .flags = DEV_RATE_CCK | DEV_RATE_BASIC,
 639                 .bitrate = 10,
 640                 .ratemask = BIT(0),
 641                 .plcp = 0x00,
 642         },
 643         {
 644                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 645                 .bitrate = 20,
 646                 .ratemask = BIT(1),
 647                 .plcp = 0x01,
 648         },
 649         {
 650                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 651                 .bitrate = 55,
 652                 .ratemask = BIT(2),
 653                 .plcp = 0x02,
 654         },
 655         {
 656                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 657                 .bitrate = 110,
 658                 .ratemask = BIT(3),
 659                 .plcp = 0x03,
 660         },
 661         {
 662                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 663                 .bitrate = 60,
 664                 .ratemask = BIT(4),
 665                 .plcp = 0x0b,
 666         },
 667         {
 668                 .flags = DEV_RATE_OFDM,
 669                 .bitrate = 90,
 670                 .ratemask = BIT(5),
 671                 .plcp = 0x0f,
 672         },
 673         {
 674                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 675                 .bitrate = 120,
 676                 .ratemask = BIT(6),
 677                 .plcp = 0x0a,
 678         },
 679         {
 680                 .flags = DEV_RATE_OFDM,
 681                 .bitrate = 180,
 682                 .ratemask = BIT(7),
 683                 .plcp = 0x0e,
 684         },
 685         {
 686                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 687                 .bitrate = 240,
 688                 .ratemask = BIT(8),
 689                 .plcp = 0x09,
 690         },
 691         {
 692                 .flags = DEV_RATE_OFDM,
 693                 .bitrate = 360,
 694                 .ratemask = BIT(9),
 695                 .plcp = 0x0d,
 696         },
 697         {
 698                 .flags = DEV_RATE_OFDM,
 699                 .bitrate = 480,
 700                 .ratemask = BIT(10),
 701                 .plcp = 0x08,
 702         },
 703         {
 704                 .flags = DEV_RATE_OFDM,
 705                 .bitrate = 540,
 706                 .ratemask = BIT(11),
 707                 .plcp = 0x0c,
 708         },
 709 };
 710
 711 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 712                               const int channel, const int tx_power,
 713                               const int value)
 714 {
 715         entry->center_freq = ieee80211_channel_to_frequency(channel);
 716         entry->hw_value = value;
 717         entry->max_power = tx_power;
 718         entry->max_antenna_gain = 0xff;
 719 }
 720
 721 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 722                            const u16 index, const struct rt2x00_rate *rate)
 723 {
 724         entry->flags = 0;
 725         entry->bitrate = rate->bitrate;
 726         entry->hw_value = rt2x00_create_rate_hw_value(index, 0);
 727         entry->hw_value_short = entry->hw_value;
 728
 729         if (rate->flags & DEV_RATE_SHORT_PREAMBLE) {
 730                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 731                 entry->hw_value_short |= rt2x00_create_rate_hw_value(index, 1);
 732         }
 733 }
 734
 735 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 736                                     struct hw_mode_spec *spec)
 737 {
 738         struct ieee80211_hw *hw = rt2x00dev->hw;
 739         struct ieee80211_channel *channels;
 740         struct ieee80211_rate *rates;
 741         unsigned int num_rates;
 742         unsigned int i;
 743         unsigned char tx_power;
 744
 745         num_rates = 0;
 746         if (spec->supported_rates & SUPPORT_RATE_CCK)
 747                 num_rates += 4;
 748         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 749                 num_rates += 8;
 750
 751         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 752         if (!channels)
 753                 return -ENOMEM;
 754
 755         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 756         if (!rates)
 757                 goto exit_free_channels;
 758
 759         /*
 760          * Initialize Rate list.
 761          */
 762         for (i = 0; i < num_rates; i++)
 763                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 764
 765         /*
 766          * Initialize Channel list.
 767          */
 768         for (i = 0; i < spec->num_channels; i++) {
 769                 if (spec->channels[i].channel <= 14) {
 770                         if (spec->tx_power_bg)
 771                                 tx_power = spec->tx_power_bg[i];
 772                         else
 773                                 tx_power = spec->tx_power_default;
 774                 } else {
 775                         if (spec->tx_power_a)
 776                                 tx_power = spec->tx_power_a[i];
 777                         else
 778                                 tx_power = spec->tx_power_default;
 779                 }
 780
 781                 rt2x00lib_channel(&channels[i],
 782                                   spec->channels[i].channel, tx_power, i);
 783         }
 784
 785         /*
 786          * Intitialize 802.11b, 802.11g
 787          * Rates: CCK, OFDM.
 788          * Channels: 2.4 GHz
 789          */
 790         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 791                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 792                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 793                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 794                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 795                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 796                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 797         }
 798
 799         /*
 800          * Intitialize 802.11a
 801          * Rates: OFDM.
 802          * Channels: OFDM, UNII, HiperLAN2.
 803          */
 804         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 805                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 806                     spec->num_channels - 14;
 807                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 808                     num_rates - 4;
 809                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 810                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 811                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 812                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 813         }
 814
 815         return 0;
 816
 817  exit_free_channels:
 818         kfree(channels);
 819         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 820         return -ENOMEM;
 821 }
 822
 823 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 824 {
 825         if (test_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags))
 826                 ieee80211_unregister_hw(rt2x00dev->hw);
 827
 828         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 829                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 830                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 831                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 832                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 833         }
 834 }
 835
 836 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 837 {
 838         struct hw_mode_spec *spec = &rt2x00dev->spec;
 839         int status;
 840
 841         /*
 842          * Initialize HW modes.
 843          */
 844         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 845         if (status)
 846                 return status;
 847
 848         /*
 849          * Initialize HW fields.
 850          */
 851         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 852
 853         /*
 854          * Register HW.
 855          */
 856         status = ieee80211_register_hw(rt2x00dev->hw);
 857         if (status) {
 858                 rt2x00lib_remove_hw(rt2x00dev);
 859                 return status;
 860         }
 861
 862         __set_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags);
 863
 864         return 0;
 865 }
 866
 867 /*
 868  * Initialization/uninitialization handlers.
 869  */
 870 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 871 {
 872         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 873                 return;
 874
 875         /*
 876          * Unregister extra components.
 877          */
 878         rt2x00rfkill_unregister(rt2x00dev);
 879
 880         /*
 881          * Allow the HW to uninitialize.
 882          */
 883         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 884
 885         /*
 886          * Free allocated queue entries.
 887          */
 888         rt2x00queue_uninitialize(rt2x00dev);
 889 }
 890
 891 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 892 {
 893         int status;
 894
 895         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 896                 return 0;
 897
 898         /*
 899          * Allocate all queue entries.
 900          */
 901         status = rt2x00queue_initialize(rt2x00dev);
 902         if (status)
 903                 return status;
 904
 905         /*
 906          * Initialize the device.
 907          */
 908         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 909         if (status) {
 910                 rt2x00queue_uninitialize(rt2x00dev);
 911                 return status;
 912         }
 913
 914         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
 915
 916         /*
 917          * Register the extra components.
 918          */
 919         rt2x00rfkill_register(rt2x00dev);
 920
 921         return 0;
 922 }
 923
 924 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 925 {
 926         int retval;
 927
 928         if (test_bit(DEVICE_STARTED, &rt2x00dev->flags))
 929                 return 0;
 930
 931         /*
 932          * If this is the first interface which is added,
 933          * we should load the firmware now.
 934          */
 935         retval = rt2x00lib_load_firmware(rt2x00dev);
 936         if (retval)
 937                 return retval;
 938
 939         /*
 940          * Initialize the device.
 941          */
 942         retval = rt2x00lib_initialize(rt2x00dev);
 943         if (retval)
 944                 return retval;
 945
 946         /*
 947          * Enable radio.
 948          */
 949         retval = rt2x00lib_enable_radio(rt2x00dev);
 950         if (retval) {
 951                 rt2x00lib_uninitialize(rt2x00dev);
 952                 return retval;
 953         }
 954
 955         rt2x00dev->intf_ap_count = 0;
 956         rt2x00dev->intf_sta_count = 0;
 957         rt2x00dev->intf_associated = 0;
 958
 959         __set_bit(DEVICE_STARTED, &rt2x00dev->flags);
 960
 961         return 0;
 962 }
 963
 964 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
 965 {
 966         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
 967                 return;
 968
 969         /*
 970          * Perhaps we can add something smarter here,
 971          * but for now just disabling the radio should do.
 972          */
 973         rt2x00lib_disable_radio(rt2x00dev);
 974
 975         rt2x00dev->intf_ap_count = 0;
 976         rt2x00dev->intf_sta_count = 0;
 977         rt2x00dev->intf_associated = 0;
 978
 979         __clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
 980 }
 981
 982 /*
 983  * driver allocation handlers.
 984  */
 985 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 986 {
 987         int retval = -ENOMEM;
 988
 989         /*
 990          * Make room for rt2x00_intf inside the per-interface
 991          * structure ieee80211_vif.
 992          */
 993         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
 994
 995         /*
 996          * Let the driver probe the device to detect the capabilities.
 997          */
 998         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
 999         if (retval) {
1000                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1001                 goto exit;
1002         }
1003
1004         /*
1005          * Initialize configuration work.
1006          */
1007         rt2x00dev->workqueue = create_singlethread_workqueue("rt2x00lib");
1008         if (!rt2x00dev->workqueue)
1009                 goto exit;
1010
1011         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1012         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
1013         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
1014
1015         /*
1016          * Allocate queue array.
1017          */
1018         retval = rt2x00queue_allocate(rt2x00dev);
1019         if (retval)
1020                 goto exit;
1021
1022         /*
1023          * Initialize ieee80211 structure.
1024          */
1025         retval = rt2x00lib_probe_hw(rt2x00dev);
1026         if (retval) {
1027                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1028                 goto exit;
1029         }
1030
1031         /*
1032          * Register extra components.
1033          */
1034         rt2x00leds_register(rt2x00dev);
1035         rt2x00rfkill_allocate(rt2x00dev);
1036         rt2x00debug_register(rt2x00dev);
1037
1038         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1039
1040         return 0;
1041
1042 exit:
1043         rt2x00lib_remove_dev(rt2x00dev);
1044
1045         return retval;
1046 }
1047 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1048
1049 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1050 {
1051         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1052
1053         /*
1054          * Disable radio.
1055          */
1056         rt2x00lib_disable_radio(rt2x00dev);
1057
1058         /*
1059          * Uninitialize device.
1060          */
1061         rt2x00lib_uninitialize(rt2x00dev);
1062
1063         /*
1064          * Free extra components
1065          */
1066         rt2x00debug_deregister(rt2x00dev);
1067         rt2x00rfkill_free(rt2x00dev);
1068         rt2x00leds_unregister(rt2x00dev);
1069
1070         /*
1071          * Stop all queued work. Note that most tasks will already be halted
1072          * during rt2x00lib_disable_radio() and rt2x00lib_uninitialize().
1073          */
1074         flush_workqueue(rt2x00dev->workqueue);
1075         destroy_workqueue(rt2x00dev->workqueue);
1076
1077         /*
1078          * Free ieee80211_hw memory.
1079          */
1080         rt2x00lib_remove_hw(rt2x00dev);
1081
1082         /*
1083          * Free firmware image.
1084          */
1085         rt2x00lib_free_firmware(rt2x00dev);
1086
1087         /*
1088          * Free queue structures.
1089          */
1090         rt2x00queue_free(rt2x00dev);
1091 }
1092 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1093
1094 /*
1095  * Device state handlers
1096  */
1097 #ifdef CONFIG_PM
1098 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1099 {
1100         int retval;
1101
1102         NOTICE(rt2x00dev, "Going to sleep.\n");
1103         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1104
1105         /*
1106          * Only continue if mac80211 has open interfaces.
1107          */
1108         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1109                 goto exit;
1110         __set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
1111
1112         /*
1113          * Disable radio.
1114          */
1115         rt2x00lib_stop(rt2x00dev);
1116         rt2x00lib_uninitialize(rt2x00dev);
1117
1118         /*
1119          * Suspend/disable extra components.
1120          */
1121         rt2x00leds_suspend(rt2x00dev);
1122         rt2x00rfkill_suspend(rt2x00dev);
1123         rt2x00debug_deregister(rt2x00dev);
1124
1125 exit:
1126         /*
1127          * Set device mode to sleep for power management,
1128          * on some hardware this call seems to consistently fail.
1129          * From the specifications it is hard to tell why it fails,
1130          * and if this is a "bad thing".
1131          * Overall it is safe to just ignore the failure and
1132          * continue suspending. The only downside is that the
1133          * device will not be in optimal power save mode, but with
1134          * the radio and the other components already disabled the
1135          * device is as good as disabled.
1136          */
1137         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1138         if (retval)
1139                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1140                         "continue suspending.\n");
1141
1142         return 0;
1143 }
1144 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1145
1146 static void rt2x00lib_resume_intf(void *data, u8 *mac,
1147                                   struct ieee80211_vif *vif)
1148 {
1149         struct rt2x00_dev *rt2x00dev = data;
1150         struct rt2x00_intf *intf = vif_to_intf(vif);
1151
1152         spin_lock(&intf->lock);
1153
1154         rt2x00lib_config_intf(rt2x00dev, intf,
1155                               vif->type, intf->mac, intf->bssid);
1156
1157
1158         /*
1159          * Master or Ad-hoc mode require a new beacon update.
1160          */
1161         if (vif->type == IEEE80211_IF_TYPE_AP ||
1162             vif->type == IEEE80211_IF_TYPE_IBSS)
1163                 intf->delayed_flags |= DELAYED_UPDATE_BEACON;
1164
1165         spin_unlock(&intf->lock);
1166 }
1167
1168 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1169 {
1170         int retval;
1171
1172         NOTICE(rt2x00dev, "Waking up.\n");
1173
1174         /*
1175          * Restore/enable extra components.
1176          */
1177         rt2x00debug_register(rt2x00dev);
1178         rt2x00rfkill_resume(rt2x00dev);
1179         rt2x00leds_resume(rt2x00dev);
1180
1181         /*
1182          * Only continue if mac80211 had open interfaces.
1183          */
1184         if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
1185                 return 0;
1186
1187         /*
1188          * Reinitialize device and all active interfaces.
1189          */
1190         retval = rt2x00lib_start(rt2x00dev);
1191         if (retval)
1192                 goto exit;
1193
1194         /*
1195          * Reconfigure device.
1196          */
1197         rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
1198         if (!rt2x00dev->hw->conf.radio_enabled)
1199                 rt2x00lib_disable_radio(rt2x00dev);
1200
1201         /*
1202          * Iterator over each active interface to
1203          * reconfigure the hardware.
1204          */
1205         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
1206                                             rt2x00lib_resume_intf, rt2x00dev);
1207
1208         /*
1209          * We are ready again to receive requests from mac80211.
1210          */
1211         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1212
1213         /*
1214          * It is possible that during that mac80211 has attempted
1215          * to send frames while we were suspending or resuming.
1216          * In that case we have disabled the TX queue and should
1217          * now enable it again
1218          */
1219         ieee80211_wake_queues(rt2x00dev->hw);
1220
1221         /*
1222          * During interface iteration we might have changed the
1223          * delayed_flags, time to handles the event by calling
1224          * the work handler directly.
1225          */
1226         rt2x00lib_intf_scheduled(&rt2x00dev->intf_work);
1227
1228         return 0;
1229
1230 exit:
1231         rt2x00lib_disable_radio(rt2x00dev);
1232         rt2x00lib_uninitialize(rt2x00dev);
1233         rt2x00debug_deregister(rt2x00dev);
1234
1235         return retval;
1236 }
1237 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1238 #endif /* CONFIG_PM */
1239
1240 /*
1241  * rt2x00lib module information.
1242  */
1243 MODULE_AUTHOR(DRV_PROJECT);
1244 MODULE_VERSION(DRV_VERSION);
1245 MODULE_DESCRIPTION("rt2x00 library");
1246 MODULE_LICENSE("GPL");