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         rt2x00leds_led_radio(rt2x00dev, true);
 116         rt2x00led_led_activity(rt2x00dev, true);
 117
 118         __set_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags);
 119
 120         /*
 121          * Enable RX.
 122          */
 123         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 124
 125         /*
 126          * Start the TX queues.
 127          */
 128         ieee80211_wake_queues(rt2x00dev->hw);
 129
 130         return 0;
 131 }
 132
 133 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
 134 {
 135         if (!__test_and_clear_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 136                 return;
 137
 138         /*
 139          * Stop all scheduled work.
 140          */
 141         if (work_pending(&rt2x00dev->intf_work))
 142                 cancel_work_sync(&rt2x00dev->intf_work);
 143         if (work_pending(&rt2x00dev->filter_work))
 144                 cancel_work_sync(&rt2x00dev->filter_work);
 145
 146         /*
 147          * Stop the TX queues.
 148          */
 149         ieee80211_stop_queues(rt2x00dev->hw);
 150
 151         /*
 152          * Disable RX.
 153          */
 154         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 155
 156         /*
 157          * Disable radio.
 158          */
 159         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 160         rt2x00led_led_activity(rt2x00dev, false);
 161         rt2x00leds_led_radio(rt2x00dev, false);
 162 }
 163
 164 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 165 {
 166         /*
 167          * When we are disabling the RX, we should also stop the link tuner.
 168          */
 169         if (state == STATE_RADIO_RX_OFF)
 170                 rt2x00lib_stop_link_tuner(rt2x00dev);
 171
 172         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 173
 174         /*
 175          * When we are enabling the RX, we should also start the link tuner.
 176          */
 177         if (state == STATE_RADIO_RX_ON &&
 178             (rt2x00dev->intf_ap_count || rt2x00dev->intf_sta_count))
 179                 rt2x00lib_start_link_tuner(rt2x00dev);
 180 }
 181
 182 static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev *rt2x00dev)
 183 {
 184         enum antenna rx = rt2x00dev->link.ant.active.rx;
 185         enum antenna tx = rt2x00dev->link.ant.active.tx;
 186         int sample_a =
 187             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_A);
 188         int sample_b =
 189             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_B);
 190
 191         /*
 192          * We are done sampling. Now we should evaluate the results.
 193          */
 194         rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
 195
 196         /*
 197          * During the last period we have sampled the RSSI
 198          * from both antenna's. It now is time to determine
 199          * which antenna demonstrated the best performance.
 200          * When we are already on the antenna with the best
 201          * performance, then there really is nothing for us
 202          * left to do.
 203          */
 204         if (sample_a == sample_b)
 205                 return;
 206
 207         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 208                 rx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 209
 210         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 211                 tx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 212
 213         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 214 }
 215
 216 static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
 217 {
 218         enum antenna rx = rt2x00dev->link.ant.active.rx;
 219         enum antenna tx = rt2x00dev->link.ant.active.tx;
 220         int rssi_curr = rt2x00_get_link_ant_rssi(&rt2x00dev->link);
 221         int rssi_old = rt2x00_update_ant_rssi(&rt2x00dev->link, rssi_curr);
 222
 223         /*
 224          * Legacy driver indicates that we should swap antenna's
 225          * when the difference in RSSI is greater that 5. This
 226          * also should be done when the RSSI was actually better
 227          * then the previous sample.
 228          * When the difference exceeds the threshold we should
 229          * sample the rssi from the other antenna to make a valid
 230          * comparison between the 2 antennas.
 231          */
 232         if (abs(rssi_curr - rssi_old) < 5)
 233                 return;
 234
 235         rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;
 236
 237         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 238                 rx = (rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 239
 240         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 241                 tx = (tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 242
 243         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 244 }
 245
 246 static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
 247 {
 248         /*
 249          * Determine if software diversity is enabled for
 250          * either the TX or RX antenna (or both).
 251          * Always perform this check since within the link
 252          * tuner interval the configuration might have changed.
 253          */
 254         rt2x00dev->link.ant.flags &= ~ANTENNA_RX_DIVERSITY;
 255         rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;
 256
 257         if (rt2x00dev->hw->conf.antenna_sel_rx == 0 &&
 258             rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY)
 259                 rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
 260         if (rt2x00dev->hw->conf.antenna_sel_tx == 0 &&
 261             rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY)
 262                 rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;
 263
 264         if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&
 265             !(rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)) {
 266                 rt2x00dev->link.ant.flags = 0;
 267                 return;
 268         }
 269
 270         /*
 271          * If we have only sampled the data over the last period
 272          * we should now harvest the data. Otherwise just evaluate
 273          * the data. The latter should only be performed once
 274          * every 2 seconds.
 275          */
 276         if (rt2x00dev->link.ant.flags & ANTENNA_MODE_SAMPLE)
 277                 rt2x00lib_evaluate_antenna_sample(rt2x00dev);
 278         else if (rt2x00dev->link.count & 1)
 279                 rt2x00lib_evaluate_antenna_eval(rt2x00dev);
 280 }
 281
 282 static void rt2x00lib_update_link_stats(struct link *link, int rssi)
 283 {
 284         int avg_rssi = rssi;
 285
 286         /*
 287          * Update global RSSI
 288          */
 289         if (link->qual.avg_rssi)
 290                 avg_rssi = MOVING_AVERAGE(link->qual.avg_rssi, rssi, 8);
 291         link->qual.avg_rssi = avg_rssi;
 292
 293         /*
 294          * Update antenna RSSI
 295          */
 296         if (link->ant.rssi_ant)
 297                 rssi = MOVING_AVERAGE(link->ant.rssi_ant, rssi, 8);
 298         link->ant.rssi_ant = rssi;
 299 }
 300
 301 static void rt2x00lib_precalculate_link_signal(struct link_qual *qual)
 302 {
 303         if (qual->rx_failed || qual->rx_success)
 304                 qual->rx_percentage =
 305                     (qual->rx_success * 100) /
 306                     (qual->rx_failed + qual->rx_success);
 307         else
 308                 qual->rx_percentage = 50;
 309
 310         if (qual->tx_failed || qual->tx_success)
 311                 qual->tx_percentage =
 312                     (qual->tx_success * 100) /
 313                     (qual->tx_failed + qual->tx_success);
 314         else
 315                 qual->tx_percentage = 50;
 316
 317         qual->rx_success = 0;
 318         qual->rx_failed = 0;
 319         qual->tx_success = 0;
 320         qual->tx_failed = 0;
 321 }
 322
 323 static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
 324                                            int rssi)
 325 {
 326         int rssi_percentage = 0;
 327         int signal;
 328
 329         /*
 330          * We need a positive value for the RSSI.
 331          */
 332         if (rssi < 0)
 333                 rssi += rt2x00dev->rssi_offset;
 334
 335         /*
 336          * Calculate the different percentages,
 337          * which will be used for the signal.
 338          */
 339         if (rt2x00dev->rssi_offset)
 340                 rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
 341
 342         /*
 343          * Add the individual percentages and use the WEIGHT
 344          * defines to calculate the current link signal.
 345          */
 346         signal = ((WEIGHT_RSSI * rssi_percentage) +
 347                   (WEIGHT_TX * rt2x00dev->link.qual.tx_percentage) +
 348                   (WEIGHT_RX * rt2x00dev->link.qual.rx_percentage)) / 100;
 349
 350         return (signal > 100) ? 100 : signal;
 351 }
 352
 353 static void rt2x00lib_link_tuner(struct work_struct *work)
 354 {
 355         struct rt2x00_dev *rt2x00dev =
 356             container_of(work, struct rt2x00_dev, link.work.work);
 357
 358         /*
 359          * When the radio is shutting down we should
 360          * immediately cease all link tuning.
 361          */
 362         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 363                 return;
 364
 365         /*
 366          * Update statistics.
 367          */
 368         rt2x00dev->ops->lib->link_stats(rt2x00dev, &rt2x00dev->link.qual);
 369         rt2x00dev->low_level_stats.dot11FCSErrorCount +=
 370             rt2x00dev->link.qual.rx_failed;
 371
 372         /*
 373          * Only perform the link tuning when Link tuning
 374          * has been enabled (This could have been disabled from the EEPROM).
 375          */
 376         if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
 377                 rt2x00dev->ops->lib->link_tuner(rt2x00dev);
 378
 379         /*
 380          * Precalculate a portion of the link signal which is
 381          * in based on the tx/rx success/failure counters.
 382          */
 383         rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
 384
 385         /*
 386          * Send a signal to the led to update the led signal strength.
 387          */
 388         rt2x00leds_led_quality(rt2x00dev, rt2x00dev->link.qual.avg_rssi);
 389
 390         /*
 391          * Evaluate antenna setup, make this the last step since this could
 392          * possibly reset some statistics.
 393          */
 394         rt2x00lib_evaluate_antenna(rt2x00dev);
 395
 396         /*
 397          * Increase tuner counter, and reschedule the next link tuner run.
 398          */
 399         rt2x00dev->link.count++;
 400         queue_delayed_work(rt2x00dev->hw->workqueue, &rt2x00dev->link.work,
 401                            LINK_TUNE_INTERVAL);
 402 }
 403
 404 static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
 405 {
 406         struct rt2x00_dev *rt2x00dev =
 407             container_of(work, struct rt2x00_dev, filter_work);
 408
 409         rt2x00dev->ops->lib->config_filter(rt2x00dev, rt2x00dev->packet_filter);
 410 }
 411
 412 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 413                                           struct ieee80211_vif *vif)
 414 {
 415         struct rt2x00_dev *rt2x00dev = data;
 416         struct rt2x00_intf *intf = vif_to_intf(vif);
 417         struct sk_buff *skb;
 418         struct ieee80211_bss_conf conf;
 419         int delayed_flags;
 420
 421         /*
 422          * Copy all data we need during this action under the protection
 423          * of a spinlock. Otherwise race conditions might occur which results
 424          * into an invalid configuration.
 425          */
 426         spin_lock(&intf->lock);
 427
 428         memcpy(&conf, &intf->conf, sizeof(conf));
 429         delayed_flags = intf->delayed_flags;
 430         intf->delayed_flags = 0;
 431
 432         spin_unlock(&intf->lock);
 433
 434         if (delayed_flags & DELAYED_UPDATE_BEACON) {
 435                 skb = ieee80211_beacon_get(rt2x00dev->hw, vif);
 436                 if (skb &&
 437                     rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, skb))
 438                         dev_kfree_skb(skb);
 439         }
 440
 441         if (delayed_flags & DELAYED_CONFIG_ERP)
 442                 rt2x00lib_config_erp(rt2x00dev, intf, &intf->conf);
 443
 444         if (delayed_flags & DELAYED_LED_ASSOC)
 445                 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
 446 }
 447
 448 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 449 {
 450         struct rt2x00_dev *rt2x00dev =
 451             container_of(work, struct rt2x00_dev, intf_work);
 452
 453         /*
 454          * Iterate over each interface and perform the
 455          * requested configurations.
 456          */
 457         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 458                                             rt2x00lib_intf_scheduled_iter,
 459                                             rt2x00dev);
 460 }
 461
 462 /*
 463  * Interrupt context handlers.
 464  */
 465 static void rt2x00lib_beacondone_iter(void *data, u8 *mac,
 466                                       struct ieee80211_vif *vif)
 467 {
 468         struct rt2x00_intf *intf = vif_to_intf(vif);
 469
 470         if (vif->type != IEEE80211_IF_TYPE_AP &&
 471             vif->type != IEEE80211_IF_TYPE_IBSS)
 472                 return;
 473
 474         spin_lock(&intf->lock);
 475         intf->delayed_flags |= DELAYED_UPDATE_BEACON;
 476         spin_unlock(&intf->lock);
 477 }
 478
 479 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 480 {
 481         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 482                 return;
 483
 484         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 485                                                    rt2x00lib_beacondone_iter,
 486                                                    rt2x00dev);
 487
 488         queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->intf_work);
 489 }
 490 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 491
 492 void rt2x00lib_txdone(struct queue_entry *entry,
 493                       struct txdone_entry_desc *txdesc)
 494 {
 495         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 496         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 497
 498         /*
 499          * Send frame to debugfs immediately, after this call is completed
 500          * we are going to overwrite the skb->cb array.
 501          */
 502         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 503
 504         /*
 505          * Update TX statistics.
 506          */
 507         rt2x00dev->link.qual.tx_success +=
 508             test_bit(TXDONE_SUCCESS, &txdesc->flags);
 509         rt2x00dev->link.qual.tx_failed +=
 510             txdesc->retry + !!test_bit(TXDONE_FAILURE, &txdesc->flags);
 511
 512         /*
 513          * Initialize TX status
 514          */
 515         memset(&tx_info->status, 0, sizeof(tx_info->status));
 516         tx_info->status.ack_signal = 0;
 517         tx_info->status.excessive_retries =
 518             test_bit(TXDONE_EXCESSIVE_RETRY, &txdesc->flags);
 519         tx_info->status.retry_count = txdesc->retry;
 520
 521         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 522                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 523                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 524                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 525                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 526         }
 527
 528         if (tx_info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) {
 529                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 530                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 531                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 532                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 533         }
 534
 535         /*
 536          * Only send the status report to mac80211 when TX status was
 537          * requested by it. If this was a extra frame coming through
 538          * a mac80211 library call (RTS/CTS) then we should not send the
 539          * status report back.
 540          */
 541         if (tx_info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)
 542                 ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb);
 543         else
 544                 dev_kfree_skb_irq(entry->skb);
 545         entry->skb = NULL;
 546 }
 547 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 548
 549 void rt2x00lib_rxdone(struct queue_entry *entry,
 550                       struct rxdone_entry_desc *rxdesc)
 551 {
 552         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 553         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 554         struct ieee80211_supported_band *sband;
 555         struct ieee80211_hdr *hdr;
 556         const struct rt2x00_rate *rate;
 557         unsigned int i;
 558         int idx = -1;
 559         u16 fc;
 560
 561         /*
 562          * Update RX statistics.
 563          */
 564         sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 565         for (i = 0; i < sband->n_bitrates; i++) {
 566                 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 567
 568                 if (((rxdesc->dev_flags & RXDONE_SIGNAL_PLCP) &&
 569                      (rate->plcp == rxdesc->signal)) ||
 570                     (!(rxdesc->dev_flags & RXDONE_SIGNAL_PLCP) &&
 571                       (rate->bitrate == rxdesc->signal))) {
 572                         idx = i;
 573                         break;
 574                 }
 575         }
 576
 577         if (idx < 0) {
 578                 WARNING(rt2x00dev, "Frame received with unrecognized signal,"
 579                         "signal=0x%.2x, plcp=%d.\n", rxdesc->signal,
 580                         !!(rxdesc->dev_flags & RXDONE_SIGNAL_PLCP));
 581                 idx = 0;
 582         }
 583
 584         /*
 585          * Only update link status if this is a beacon frame carrying our bssid.
 586          */
 587         hdr = (struct ieee80211_hdr *)entry->skb->data;
 588         fc = le16_to_cpu(hdr->frame_control);
 589         if (is_beacon(fc) && (rxdesc->dev_flags & RXDONE_MY_BSS))
 590                 rt2x00lib_update_link_stats(&rt2x00dev->link, rxdesc->rssi);
 591
 592         rt2x00dev->link.qual.rx_success++;
 593
 594         rx_status->rate_idx = idx;
 595         rx_status->qual =
 596             rt2x00lib_calculate_link_signal(rt2x00dev, rxdesc->rssi);
 597         rx_status->signal = rxdesc->rssi;
 598         rx_status->flag = rxdesc->flags;
 599         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 600
 601         /*
 602          * Send frame to mac80211 & debugfs.
 603          * mac80211 will clean up the skb structure.
 604          */
 605         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 606         ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb, rx_status);
 607         entry->skb = NULL;
 608 }
 609 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 610
 611 /*
 612  * Driver initialization handlers.
 613  */
 614 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 615         {
 616                 .flags = DEV_RATE_CCK | DEV_RATE_BASIC,
 617                 .bitrate = 10,
 618                 .ratemask = BIT(0),
 619                 .plcp = 0x00,
 620         },
 621         {
 622                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 623                 .bitrate = 20,
 624                 .ratemask = BIT(1),
 625                 .plcp = 0x01,
 626         },
 627         {
 628                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 629                 .bitrate = 55,
 630                 .ratemask = BIT(2),
 631                 .plcp = 0x02,
 632         },
 633         {
 634                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE | DEV_RATE_BASIC,
 635                 .bitrate = 110,
 636                 .ratemask = BIT(3),
 637                 .plcp = 0x03,
 638         },
 639         {
 640                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 641                 .bitrate = 60,
 642                 .ratemask = BIT(4),
 643                 .plcp = 0x0b,
 644         },
 645         {
 646                 .flags = DEV_RATE_OFDM,
 647                 .bitrate = 90,
 648                 .ratemask = BIT(5),
 649                 .plcp = 0x0f,
 650         },
 651         {
 652                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 653                 .bitrate = 120,
 654                 .ratemask = BIT(6),
 655                 .plcp = 0x0a,
 656         },
 657         {
 658                 .flags = DEV_RATE_OFDM,
 659                 .bitrate = 180,
 660                 .ratemask = BIT(7),
 661                 .plcp = 0x0e,
 662         },
 663         {
 664                 .flags = DEV_RATE_OFDM | DEV_RATE_BASIC,
 665                 .bitrate = 240,
 666                 .ratemask = BIT(8),
 667                 .plcp = 0x09,
 668         },
 669         {
 670                 .flags = DEV_RATE_OFDM,
 671                 .bitrate = 360,
 672                 .ratemask = BIT(9),
 673                 .plcp = 0x0d,
 674         },
 675         {
 676                 .flags = DEV_RATE_OFDM,
 677                 .bitrate = 480,
 678                 .ratemask = BIT(10),
 679                 .plcp = 0x08,
 680         },
 681         {
 682                 .flags = DEV_RATE_OFDM,
 683                 .bitrate = 540,
 684                 .ratemask = BIT(11),
 685                 .plcp = 0x0c,
 686         },
 687 };
 688
 689 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 690                               const int channel, const int tx_power,
 691                               const int value)
 692 {
 693         entry->center_freq = ieee80211_channel_to_frequency(channel);
 694         entry->hw_value = value;
 695         entry->max_power = tx_power;
 696         entry->max_antenna_gain = 0xff;
 697 }
 698
 699 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 700                            const u16 index, const struct rt2x00_rate *rate)
 701 {
 702         entry->flags = 0;
 703         entry->bitrate = rate->bitrate;
 704         entry->hw_value = rt2x00_create_rate_hw_value(index, 0);
 705         entry->hw_value_short = entry->hw_value;
 706
 707         if (rate->flags & DEV_RATE_SHORT_PREAMBLE) {
 708                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 709                 entry->hw_value_short |= rt2x00_create_rate_hw_value(index, 1);
 710         }
 711 }
 712
 713 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 714                                     struct hw_mode_spec *spec)
 715 {
 716         struct ieee80211_hw *hw = rt2x00dev->hw;
 717         struct ieee80211_channel *channels;
 718         struct ieee80211_rate *rates;
 719         unsigned int num_rates;
 720         unsigned int i;
 721         unsigned char tx_power;
 722
 723         num_rates = 0;
 724         if (spec->supported_rates & SUPPORT_RATE_CCK)
 725                 num_rates += 4;
 726         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 727                 num_rates += 8;
 728
 729         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 730         if (!channels)
 731                 return -ENOMEM;
 732
 733         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 734         if (!rates)
 735                 goto exit_free_channels;
 736
 737         /*
 738          * Initialize Rate list.
 739          */
 740         for (i = 0; i < num_rates; i++)
 741                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 742
 743         /*
 744          * Initialize Channel list.
 745          */
 746         for (i = 0; i < spec->num_channels; i++) {
 747                 if (spec->channels[i].channel <= 14) {
 748                         if (spec->tx_power_bg)
 749                                 tx_power = spec->tx_power_bg[i];
 750                         else
 751                                 tx_power = spec->tx_power_default;
 752                 } else {
 753                         if (spec->tx_power_a)
 754                                 tx_power = spec->tx_power_a[i];
 755                         else
 756                                 tx_power = spec->tx_power_default;
 757                 }
 758
 759                 rt2x00lib_channel(&channels[i],
 760                                   spec->channels[i].channel, tx_power, i);
 761         }
 762
 763         /*
 764          * Intitialize 802.11b, 802.11g
 765          * Rates: CCK, OFDM.
 766          * Channels: 2.4 GHz
 767          */
 768         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 769                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 770                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 771                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 772                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 773                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 774                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 775         }
 776
 777         /*
 778          * Intitialize 802.11a
 779          * Rates: OFDM.
 780          * Channels: OFDM, UNII, HiperLAN2.
 781          */
 782         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 783                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 784                     spec->num_channels - 14;
 785                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 786                     num_rates - 4;
 787                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 788                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 789                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 790                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 791         }
 792
 793         return 0;
 794
 795  exit_free_channels:
 796         kfree(channels);
 797         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 798         return -ENOMEM;
 799 }
 800
 801 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 802 {
 803         if (test_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags))
 804                 ieee80211_unregister_hw(rt2x00dev->hw);
 805
 806         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 807                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 808                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 809                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 810                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 811         }
 812 }
 813
 814 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 815 {
 816         struct hw_mode_spec *spec = &rt2x00dev->spec;
 817         int status;
 818
 819         /*
 820          * Initialize HW modes.
 821          */
 822         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 823         if (status)
 824                 return status;
 825
 826         /*
 827          * Initialize HW fields.
 828          */
 829         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 830
 831         /*
 832          * Register HW.
 833          */
 834         status = ieee80211_register_hw(rt2x00dev->hw);
 835         if (status) {
 836                 rt2x00lib_remove_hw(rt2x00dev);
 837                 return status;
 838         }
 839
 840         __set_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags);
 841
 842         return 0;
 843 }
 844
 845 /*
 846  * Initialization/uninitialization handlers.
 847  */
 848 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 849 {
 850         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 851                 return;
 852
 853         /*
 854          * Unregister extra components.
 855          */
 856         rt2x00rfkill_unregister(rt2x00dev);
 857
 858         /*
 859          * Allow the HW to uninitialize.
 860          */
 861         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 862
 863         /*
 864          * Free allocated queue entries.
 865          */
 866         rt2x00queue_uninitialize(rt2x00dev);
 867 }
 868
 869 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 870 {
 871         int status;
 872
 873         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 874                 return 0;
 875
 876         /*
 877          * Allocate all queue entries.
 878          */
 879         status = rt2x00queue_initialize(rt2x00dev);
 880         if (status)
 881                 return status;
 882
 883         /*
 884          * Initialize the device.
 885          */
 886         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 887         if (status) {
 888                 rt2x00queue_uninitialize(rt2x00dev);
 889                 return status;
 890         }
 891
 892         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
 893
 894         /*
 895          * Register the extra components.
 896          */
 897         rt2x00rfkill_register(rt2x00dev);
 898
 899         return 0;
 900 }
 901
 902 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 903 {
 904         int retval;
 905
 906         if (test_bit(DEVICE_STARTED, &rt2x00dev->flags))
 907                 return 0;
 908
 909         /*
 910          * If this is the first interface which is added,
 911          * we should load the firmware now.
 912          */
 913         retval = rt2x00lib_load_firmware(rt2x00dev);
 914         if (retval)
 915                 return retval;
 916
 917         /*
 918          * Initialize the device.
 919          */
 920         retval = rt2x00lib_initialize(rt2x00dev);
 921         if (retval)
 922                 return retval;
 923
 924         /*
 925          * Enable radio.
 926          */
 927         retval = rt2x00lib_enable_radio(rt2x00dev);
 928         if (retval) {
 929                 rt2x00lib_uninitialize(rt2x00dev);
 930                 return retval;
 931         }
 932
 933         rt2x00dev->intf_ap_count = 0;
 934         rt2x00dev->intf_sta_count = 0;
 935         rt2x00dev->intf_associated = 0;
 936
 937         __set_bit(DEVICE_STARTED, &rt2x00dev->flags);
 938
 939         return 0;
 940 }
 941
 942 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
 943 {
 944         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
 945                 return;
 946
 947         /*
 948          * Perhaps we can add something smarter here,
 949          * but for now just disabling the radio should do.
 950          */
 951         rt2x00lib_disable_radio(rt2x00dev);
 952
 953         rt2x00dev->intf_ap_count = 0;
 954         rt2x00dev->intf_sta_count = 0;
 955         rt2x00dev->intf_associated = 0;
 956
 957         __clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
 958 }
 959
 960 /*
 961  * driver allocation handlers.
 962  */
 963 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 964 {
 965         int retval = -ENOMEM;
 966
 967         /*
 968          * Make room for rt2x00_intf inside the per-interface
 969          * structure ieee80211_vif.
 970          */
 971         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
 972
 973         /*
 974          * Let the driver probe the device to detect the capabilities.
 975          */
 976         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
 977         if (retval) {
 978                 ERROR(rt2x00dev, "Failed to allocate device.\n");
 979                 goto exit;
 980         }
 981
 982         /*
 983          * Initialize configuration work.
 984          */
 985         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
 986         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
 987         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
 988
 989         /*
 990          * Allocate queue array.
 991          */
 992         retval = rt2x00queue_allocate(rt2x00dev);
 993         if (retval)
 994                 goto exit;
 995
 996         /*
 997          * Initialize ieee80211 structure.
 998          */
 999         retval = rt2x00lib_probe_hw(rt2x00dev);
1000         if (retval) {
1001                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1002                 goto exit;
1003         }
1004
1005         /*
1006          * Register extra components.
1007          */
1008         rt2x00leds_register(rt2x00dev);
1009         rt2x00rfkill_allocate(rt2x00dev);
1010         rt2x00debug_register(rt2x00dev);
1011
1012         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1013
1014         return 0;
1015
1016 exit:
1017         rt2x00lib_remove_dev(rt2x00dev);
1018
1019         return retval;
1020 }
1021 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1022
1023 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1024 {
1025         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1026
1027         /*
1028          * Disable radio.
1029          */
1030         rt2x00lib_disable_radio(rt2x00dev);
1031
1032         /*
1033          * Uninitialize device.
1034          */
1035         rt2x00lib_uninitialize(rt2x00dev);
1036
1037         /*
1038          * Free extra components
1039          */
1040         rt2x00debug_deregister(rt2x00dev);
1041         rt2x00rfkill_free(rt2x00dev);
1042         rt2x00leds_unregister(rt2x00dev);
1043
1044         /*
1045          * Free ieee80211_hw memory.
1046          */
1047         rt2x00lib_remove_hw(rt2x00dev);
1048
1049         /*
1050          * Free firmware image.
1051          */
1052         rt2x00lib_free_firmware(rt2x00dev);
1053
1054         /*
1055          * Free queue structures.
1056          */
1057         rt2x00queue_free(rt2x00dev);
1058 }
1059 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1060
1061 /*
1062  * Device state handlers
1063  */
1064 #ifdef CONFIG_PM
1065 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1066 {
1067         int retval;
1068
1069         NOTICE(rt2x00dev, "Going to sleep.\n");
1070         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1071
1072         /*
1073          * Only continue if mac80211 has open interfaces.
1074          */
1075         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1076                 goto exit;
1077         __set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
1078
1079         /*
1080          * Disable radio.
1081          */
1082         rt2x00lib_stop(rt2x00dev);
1083         rt2x00lib_uninitialize(rt2x00dev);
1084
1085         /*
1086          * Suspend/disable extra components.
1087          */
1088         rt2x00leds_suspend(rt2x00dev);
1089         rt2x00rfkill_suspend(rt2x00dev);
1090         rt2x00debug_deregister(rt2x00dev);
1091
1092 exit:
1093         /*
1094          * Set device mode to sleep for power management,
1095          * on some hardware this call seems to consistently fail.
1096          * From the specifications it is hard to tell why it fails,
1097          * and if this is a "bad thing".
1098          * Overall it is safe to just ignore the failure and
1099          * continue suspending. The only downside is that the
1100          * device will not be in optimal power save mode, but with
1101          * the radio and the other components already disabled the
1102          * device is as good as disabled.
1103          */
1104         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1105         if (retval)
1106                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1107                         "continue suspending.\n");
1108
1109         return 0;
1110 }
1111 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1112
1113 static void rt2x00lib_resume_intf(void *data, u8 *mac,
1114                                   struct ieee80211_vif *vif)
1115 {
1116         struct rt2x00_dev *rt2x00dev = data;
1117         struct rt2x00_intf *intf = vif_to_intf(vif);
1118
1119         spin_lock(&intf->lock);
1120
1121         rt2x00lib_config_intf(rt2x00dev, intf,
1122                               vif->type, intf->mac, intf->bssid);
1123
1124
1125         /*
1126          * Master or Ad-hoc mode require a new beacon update.
1127          */
1128         if (vif->type == IEEE80211_IF_TYPE_AP ||
1129             vif->type == IEEE80211_IF_TYPE_IBSS)
1130                 intf->delayed_flags |= DELAYED_UPDATE_BEACON;
1131
1132         spin_unlock(&intf->lock);
1133 }
1134
1135 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1136 {
1137         int retval;
1138
1139         NOTICE(rt2x00dev, "Waking up.\n");
1140
1141         /*
1142          * Restore/enable extra components.
1143          */
1144         rt2x00debug_register(rt2x00dev);
1145         rt2x00rfkill_resume(rt2x00dev);
1146         rt2x00leds_resume(rt2x00dev);
1147
1148         /*
1149          * Only continue if mac80211 had open interfaces.
1150          */
1151         if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
1152                 return 0;
1153
1154         /*
1155          * Reinitialize device and all active interfaces.
1156          */
1157         retval = rt2x00lib_start(rt2x00dev);
1158         if (retval)
1159                 goto exit;
1160
1161         /*
1162          * Reconfigure device.
1163          */
1164         rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
1165         if (!rt2x00dev->hw->conf.radio_enabled)
1166                 rt2x00lib_disable_radio(rt2x00dev);
1167
1168         /*
1169          * Iterator over each active interface to
1170          * reconfigure the hardware.
1171          */
1172         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
1173                                             rt2x00lib_resume_intf, rt2x00dev);
1174
1175         /*
1176          * We are ready again to receive requests from mac80211.
1177          */
1178         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1179
1180         /*
1181          * It is possible that during that mac80211 has attempted
1182          * to send frames while we were suspending or resuming.
1183          * In that case we have disabled the TX queue and should
1184          * now enable it again
1185          */
1186         ieee80211_wake_queues(rt2x00dev->hw);
1187
1188         /*
1189          * During interface iteration we might have changed the
1190          * delayed_flags, time to handles the event by calling
1191          * the work handler directly.
1192          */
1193         rt2x00lib_intf_scheduled(&rt2x00dev->intf_work);
1194
1195         return 0;
1196
1197 exit:
1198         rt2x00lib_disable_radio(rt2x00dev);
1199         rt2x00lib_uninitialize(rt2x00dev);
1200         rt2x00debug_deregister(rt2x00dev);
1201
1202         return retval;
1203 }
1204 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1205 #endif /* CONFIG_PM */
1206
1207 /*
1208  * rt2x00lib module information.
1209  */
1210 MODULE_AUTHOR(DRV_PROJECT);
1211 MODULE_VERSION(DRV_VERSION);
1212 MODULE_DESCRIPTION("rt2x00 library");
1213 MODULE_LICENSE("GPL");