drivers/net/wireless/rt2x00/rt2x00dev.c

   1 /*
   2         Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00lib
  23         Abstract: rt2x00 generic device routines.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28
  29 #include "rt2x00.h"
  30 #include "rt2x00lib.h"
  31 #include "rt2x00dump.h"
  32
  33 /*
  34  * Ring handler.
  35  */
  36 struct data_ring *rt2x00lib_get_ring(struct rt2x00_dev *rt2x00dev,
  37                                      const unsigned int queue)
  38 {
  39         int beacon = test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags);
  40
  41         /*
  42          * Check if we are requesting a reqular TX ring,
  43          * or if we are requesting a Beacon or Atim ring.
  44          * For Atim rings, we should check if it is supported.
  45          */
  46         if (queue < rt2x00dev->hw->queues && rt2x00dev->tx)
  47                 return &rt2x00dev->tx[queue];
  48
  49         if (!rt2x00dev->bcn || !beacon)
  50                 return NULL;
  51
  52         if (queue == IEEE80211_TX_QUEUE_BEACON)
  53                 return &rt2x00dev->bcn[0];
  54         else if (queue == IEEE80211_TX_QUEUE_AFTER_BEACON)
  55                 return &rt2x00dev->bcn[1];
  56
  57         return NULL;
  58 }
  59 EXPORT_SYMBOL_GPL(rt2x00lib_get_ring);
  60
  61 /*
  62  * Link tuning handlers
  63  */
  64 static void rt2x00lib_start_link_tuner(struct rt2x00_dev *rt2x00dev)
  65 {
  66         rt2x00dev->link.count = 0;
  67         rt2x00dev->link.vgc_level = 0;
  68
  69         memset(&rt2x00dev->link.qual, 0, sizeof(rt2x00dev->link.qual));
  70
  71         /*
  72          * The RX and TX percentage should start at 50%
  73          * this will assure we will get at least get some
  74          * decent value when the link tuner starts.
  75          * The value will be dropped and overwritten with
  76          * the correct (measured )value anyway during the
  77          * first run of the link tuner.
  78          */
  79         rt2x00dev->link.qual.rx_percentage = 50;
  80         rt2x00dev->link.qual.tx_percentage = 50;
  81
  82         /*
  83          * Reset the link tuner.
  84          */
  85         rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
  86
  87         queue_delayed_work(rt2x00dev->hw->workqueue,
  88                            &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
  89 }
  90
  91 static void rt2x00lib_stop_link_tuner(struct rt2x00_dev *rt2x00dev)
  92 {
  93         cancel_delayed_work_sync(&rt2x00dev->link.work);
  94 }
  95
  96 void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
  97 {
  98         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
  99                 return;
 100
 101         rt2x00lib_stop_link_tuner(rt2x00dev);
 102         rt2x00lib_start_link_tuner(rt2x00dev);
 103 }
 104
 105 /*
 106  * Ring initialization
 107  */
 108 static void rt2x00lib_init_rxrings(struct rt2x00_dev *rt2x00dev)
 109 {
 110         struct data_ring *ring = rt2x00dev->rx;
 111         unsigned int i;
 112
 113         if (!rt2x00dev->ops->lib->init_rxentry)
 114                 return;
 115
 116         if (ring->data_addr)
 117                 memset(ring->data_addr, 0, rt2x00_get_ring_size(ring));
 118
 119         for (i = 0; i < ring->stats.limit; i++)
 120                 rt2x00dev->ops->lib->init_rxentry(rt2x00dev, &ring->entry[i]);
 121
 122         rt2x00_ring_index_clear(ring);
 123 }
 124
 125 static void rt2x00lib_init_txrings(struct rt2x00_dev *rt2x00dev)
 126 {
 127         struct data_ring *ring;
 128         unsigned int i;
 129
 130         if (!rt2x00dev->ops->lib->init_txentry)
 131                 return;
 132
 133         txringall_for_each(rt2x00dev, ring) {
 134                 if (ring->data_addr)
 135                         memset(ring->data_addr, 0, rt2x00_get_ring_size(ring));
 136
 137                 for (i = 0; i < ring->stats.limit; i++)
 138                         rt2x00dev->ops->lib->init_txentry(rt2x00dev,
 139                                                           &ring->entry[i]);
 140
 141                 rt2x00_ring_index_clear(ring);
 142         }
 143 }
 144
 145 /*
 146  * Radio control handlers.
 147  */
 148 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
 149 {
 150         int status;
 151
 152         /*
 153          * Don't enable the radio twice.
 154          * And check if the hardware button has been disabled.
 155          */
 156         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 157             test_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags))
 158                 return 0;
 159
 160         /*
 161          * Initialize all data rings.
 162          */
 163         rt2x00lib_init_rxrings(rt2x00dev);
 164         rt2x00lib_init_txrings(rt2x00dev);
 165
 166         /*
 167          * Enable radio.
 168          */
 169         status = rt2x00dev->ops->lib->set_device_state(rt2x00dev,
 170                                                        STATE_RADIO_ON);
 171         if (status)
 172                 return status;
 173
 174         __set_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags);
 175
 176         /*
 177          * Enable RX.
 178          */
 179         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 180
 181         /*
 182          * Start the TX queues.
 183          */
 184         ieee80211_start_queues(rt2x00dev->hw);
 185
 186         return 0;
 187 }
 188
 189 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
 190 {
 191         if (!__test_and_clear_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 192                 return;
 193
 194         /*
 195          * Stop all scheduled work.
 196          */
 197         if (work_pending(&rt2x00dev->beacon_work))
 198                 cancel_work_sync(&rt2x00dev->beacon_work);
 199         if (work_pending(&rt2x00dev->filter_work))
 200                 cancel_work_sync(&rt2x00dev->filter_work);
 201         if (work_pending(&rt2x00dev->config_work))
 202                 cancel_work_sync(&rt2x00dev->config_work);
 203
 204         /*
 205          * Stop the TX queues.
 206          */
 207         ieee80211_stop_queues(rt2x00dev->hw);
 208
 209         /*
 210          * Disable RX.
 211          */
 212         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 213
 214         /*
 215          * Disable radio.
 216          */
 217         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 218 }
 219
 220 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 221 {
 222         /*
 223          * When we are disabling the RX, we should also stop the link tuner.
 224          */
 225         if (state == STATE_RADIO_RX_OFF)
 226                 rt2x00lib_stop_link_tuner(rt2x00dev);
 227
 228         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 229
 230         /*
 231          * When we are enabling the RX, we should also start the link tuner.
 232          */
 233         if (state == STATE_RADIO_RX_ON &&
 234             is_interface_present(&rt2x00dev->interface))
 235                 rt2x00lib_start_link_tuner(rt2x00dev);
 236 }
 237
 238 static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev *rt2x00dev)
 239 {
 240         enum antenna rx = rt2x00dev->link.ant.active.rx;
 241         enum antenna tx = rt2x00dev->link.ant.active.tx;
 242         int sample_a =
 243             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_A);
 244         int sample_b =
 245             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_B);
 246
 247         /*
 248          * We are done sampling. Now we should evaluate the results.
 249          */
 250         rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
 251
 252         /*
 253          * During the last period we have sampled the RSSI
 254          * from both antenna's. It now is time to determine
 255          * which antenna demonstrated the best performance.
 256          * When we are already on the antenna with the best
 257          * performance, then there really is nothing for us
 258          * left to do.
 259          */
 260         if (sample_a == sample_b)
 261                 return;
 262
 263         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 264                 rx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 265
 266         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 267                 tx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
 268
 269         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 270 }
 271
 272 static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
 273 {
 274         enum antenna rx = rt2x00dev->link.ant.active.rx;
 275         enum antenna tx = rt2x00dev->link.ant.active.tx;
 276         int rssi_curr = rt2x00_get_link_ant_rssi(&rt2x00dev->link);
 277         int rssi_old = rt2x00_update_ant_rssi(&rt2x00dev->link, rssi_curr);
 278
 279         /*
 280          * Legacy driver indicates that we should swap antenna's
 281          * when the difference in RSSI is greater that 5. This
 282          * also should be done when the RSSI was actually better
 283          * then the previous sample.
 284          * When the difference exceeds the threshold we should
 285          * sample the rssi from the other antenna to make a valid
 286          * comparison between the 2 antennas.
 287          */
 288         if (abs(rssi_curr - rssi_old) < 5)
 289                 return;
 290
 291         rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;
 292
 293         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 294                 rx = (rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 295
 296         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 297                 tx = (tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 298
 299         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 300 }
 301
 302 static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
 303 {
 304         /*
 305          * Determine if software diversity is enabled for
 306          * either the TX or RX antenna (or both).
 307          * Always perform this check since within the link
 308          * tuner interval the configuration might have changed.
 309          */
 310         rt2x00dev->link.ant.flags &= ~ANTENNA_RX_DIVERSITY;
 311         rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;
 312
 313         if (rt2x00dev->hw->conf.antenna_sel_rx == 0 &&
 314             rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY)
 315                 rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
 316         if (rt2x00dev->hw->conf.antenna_sel_tx == 0 &&
 317             rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY)
 318                 rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;
 319
 320         if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&
 321             !(rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)) {
 322                 rt2x00dev->link.ant.flags = 0;
 323                 return;
 324         }
 325
 326         /*
 327          * If we have only sampled the data over the last period
 328          * we should now harvest the data. Otherwise just evaluate
 329          * the data. The latter should only be performed once
 330          * every 2 seconds.
 331          */
 332         if (rt2x00dev->link.ant.flags & ANTENNA_MODE_SAMPLE)
 333                 rt2x00lib_evaluate_antenna_sample(rt2x00dev);
 334         else if (rt2x00dev->link.count & 1)
 335                 rt2x00lib_evaluate_antenna_eval(rt2x00dev);
 336 }
 337
 338 static void rt2x00lib_update_link_stats(struct link *link, int rssi)
 339 {
 340         int avg_rssi = rssi;
 341
 342         /*
 343          * Update global RSSI
 344          */
 345         if (link->qual.avg_rssi)
 346                 avg_rssi = MOVING_AVERAGE(link->qual.avg_rssi, rssi, 8);
 347         link->qual.avg_rssi = avg_rssi;
 348
 349         /*
 350          * Update antenna RSSI
 351          */
 352         if (link->ant.rssi_ant)
 353                 rssi = MOVING_AVERAGE(link->ant.rssi_ant, rssi, 8);
 354         link->ant.rssi_ant = rssi;
 355 }
 356
 357 static void rt2x00lib_precalculate_link_signal(struct link_qual *qual)
 358 {
 359         if (qual->rx_failed || qual->rx_success)
 360                 qual->rx_percentage =
 361                     (qual->rx_success * 100) /
 362                     (qual->rx_failed + qual->rx_success);
 363         else
 364                 qual->rx_percentage = 50;
 365
 366         if (qual->tx_failed || qual->tx_success)
 367                 qual->tx_percentage =
 368                     (qual->tx_success * 100) /
 369                     (qual->tx_failed + qual->tx_success);
 370         else
 371                 qual->tx_percentage = 50;
 372
 373         qual->rx_success = 0;
 374         qual->rx_failed = 0;
 375         qual->tx_success = 0;
 376         qual->tx_failed = 0;
 377 }
 378
 379 static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
 380                                            int rssi)
 381 {
 382         int rssi_percentage = 0;
 383         int signal;
 384
 385         /*
 386          * We need a positive value for the RSSI.
 387          */
 388         if (rssi < 0)
 389                 rssi += rt2x00dev->rssi_offset;
 390
 391         /*
 392          * Calculate the different percentages,
 393          * which will be used for the signal.
 394          */
 395         if (rt2x00dev->rssi_offset)
 396                 rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
 397
 398         /*
 399          * Add the individual percentages and use the WEIGHT
 400          * defines to calculate the current link signal.
 401          */
 402         signal = ((WEIGHT_RSSI * rssi_percentage) +
 403                   (WEIGHT_TX * rt2x00dev->link.qual.tx_percentage) +
 404                   (WEIGHT_RX * rt2x00dev->link.qual.rx_percentage)) / 100;
 405
 406         return (signal > 100) ? 100 : signal;
 407 }
 408
 409 static void rt2x00lib_link_tuner(struct work_struct *work)
 410 {
 411         struct rt2x00_dev *rt2x00dev =
 412             container_of(work, struct rt2x00_dev, link.work.work);
 413
 414         /*
 415          * When the radio is shutting down we should
 416          * immediately cease all link tuning.
 417          */
 418         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 419                 return;
 420
 421         /*
 422          * Update statistics.
 423          */
 424         rt2x00dev->ops->lib->link_stats(rt2x00dev, &rt2x00dev->link.qual);
 425         rt2x00dev->low_level_stats.dot11FCSErrorCount +=
 426             rt2x00dev->link.qual.rx_failed;
 427
 428         /*
 429          * Only perform the link tuning when Link tuning
 430          * has been enabled (This could have been disabled from the EEPROM).
 431          */
 432         if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
 433                 rt2x00dev->ops->lib->link_tuner(rt2x00dev);
 434
 435         /*
 436          * Evaluate antenna setup.
 437          */
 438         rt2x00lib_evaluate_antenna(rt2x00dev);
 439
 440         /*
 441          * Precalculate a portion of the link signal which is
 442          * in based on the tx/rx success/failure counters.
 443          */
 444         rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
 445
 446         /*
 447          * Increase tuner counter, and reschedule the next link tuner run.
 448          */
 449         rt2x00dev->link.count++;
 450         queue_delayed_work(rt2x00dev->hw->workqueue, &rt2x00dev->link.work,
 451                            LINK_TUNE_INTERVAL);
 452 }
 453
 454 static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
 455 {
 456         struct rt2x00_dev *rt2x00dev =
 457             container_of(work, struct rt2x00_dev, filter_work);
 458         unsigned int filter = rt2x00dev->packet_filter;
 459
 460         /*
 461          * Since we had stored the filter inside interface.filter,
 462          * we should now clear that field. Otherwise the driver will
 463          * assume nothing has changed (*total_flags will be compared
 464          * to interface.filter to determine if any action is required).
 465          */
 466         rt2x00dev->packet_filter = 0;
 467
 468         rt2x00dev->ops->hw->configure_filter(rt2x00dev->hw,
 469                                              filter, &filter, 0, NULL);
 470 }
 471
 472 static void rt2x00lib_configuration_scheduled(struct work_struct *work)
 473 {
 474         struct rt2x00_dev *rt2x00dev =
 475             container_of(work, struct rt2x00_dev, config_work);
 476         struct ieee80211_bss_conf bss_conf;
 477
 478         bss_conf.use_short_preamble =
 479                 test_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
 480
 481         /*
 482          * FIXME: shouldn't invoke it this way because all other contents
 483          *        of bss_conf is invalid.
 484          */
 485         rt2x00mac_bss_info_changed(rt2x00dev->hw, rt2x00dev->interface.id,
 486                                    &bss_conf, BSS_CHANGED_ERP_PREAMBLE);
 487 }
 488
 489 /*
 490  * Interrupt context handlers.
 491  */
 492 static void rt2x00lib_beacondone_scheduled(struct work_struct *work)
 493 {
 494         struct rt2x00_dev *rt2x00dev =
 495             container_of(work, struct rt2x00_dev, beacon_work);
 496         struct data_ring *ring =
 497             rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
 498         struct data_entry *entry = rt2x00_get_data_entry(ring);
 499         struct sk_buff *skb;
 500
 501         skb = ieee80211_beacon_get(rt2x00dev->hw,
 502                                    rt2x00dev->interface.id,
 503                                    &entry->tx_status.control);
 504         if (!skb)
 505                 return;
 506
 507         rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, skb,
 508                                           &entry->tx_status.control);
 509
 510         dev_kfree_skb(skb);
 511 }
 512
 513 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 514 {
 515         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 516                 return;
 517
 518         queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->beacon_work);
 519 }
 520 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 521
 522 void rt2x00lib_txdone(struct data_entry *entry,
 523                       const int status, const int retry)
 524 {
 525         struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
 526         struct ieee80211_tx_status *tx_status = &entry->tx_status;
 527         struct ieee80211_low_level_stats *stats = &rt2x00dev->low_level_stats;
 528         int success = !!(status == TX_SUCCESS || status == TX_SUCCESS_RETRY);
 529         int fail = !!(status == TX_FAIL_RETRY || status == TX_FAIL_INVALID ||
 530                       status == TX_FAIL_OTHER);
 531
 532         /*
 533          * Update TX statistics.
 534          */
 535         tx_status->flags = 0;
 536         tx_status->ack_signal = 0;
 537         tx_status->excessive_retries = (status == TX_FAIL_RETRY);
 538         tx_status->retry_count = retry;
 539         rt2x00dev->link.qual.tx_success += success;
 540         rt2x00dev->link.qual.tx_failed += retry + fail;
 541
 542         if (!(tx_status->control.flags & IEEE80211_TXCTL_NO_ACK)) {
 543                 if (success)
 544                         tx_status->flags |= IEEE80211_TX_STATUS_ACK;
 545                 else
 546                         stats->dot11ACKFailureCount++;
 547         }
 548
 549         tx_status->queue_length = entry->ring->stats.limit;
 550         tx_status->queue_number = tx_status->control.queue;
 551
 552         if (tx_status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) {
 553                 if (success)
 554                         stats->dot11RTSSuccessCount++;
 555                 else
 556                         stats->dot11RTSFailureCount++;
 557         }
 558
 559         /*
 560          * Send the tx_status to mac80211 & debugfs.
 561          * mac80211 will clean up the skb structure.
 562          */
 563         get_skb_desc(entry->skb)->frame_type = DUMP_FRAME_TXDONE;
 564         rt2x00debug_dump_frame(rt2x00dev, entry->skb);
 565         ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb, tx_status);
 566         entry->skb = NULL;
 567 }
 568 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 569
 570 void rt2x00lib_rxdone(struct data_entry *entry, struct sk_buff *skb,
 571                       struct rxdata_entry_desc *desc)
 572 {
 573         struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
 574         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 575         struct ieee80211_hw_mode *mode;
 576         struct ieee80211_rate *rate;
 577         struct ieee80211_hdr *hdr;
 578         unsigned int i;
 579         int val = 0;
 580         u16 fc;
 581
 582         /*
 583          * Update RX statistics.
 584          */
 585         mode = &rt2x00dev->hwmodes[rt2x00dev->curr_hwmode];
 586         for (i = 0; i < mode->num_rates; i++) {
 587                 rate = &mode->rates[i];
 588
 589                 /*
 590                  * When frame was received with an OFDM bitrate,
 591                  * the signal is the PLCP value. If it was received with
 592                  * a CCK bitrate the signal is the rate in 0.5kbit/s.
 593                  */
 594                 if (!desc->ofdm)
 595                         val = DEVICE_GET_RATE_FIELD(rate->val, RATE);
 596                 else
 597                         val = DEVICE_GET_RATE_FIELD(rate->val, PLCP);
 598
 599                 if (val == desc->signal) {
 600                         val = rate->val;
 601                         break;
 602                 }
 603         }
 604
 605         /*
 606          * Only update link status if this is a beacon frame carrying our bssid.
 607          */
 608         hdr = (struct ieee80211_hdr*)skb->data;
 609         fc = le16_to_cpu(hdr->frame_control);
 610         if (is_beacon(fc) && desc->my_bss)
 611                 rt2x00lib_update_link_stats(&rt2x00dev->link, desc->rssi);
 612
 613         rt2x00dev->link.qual.rx_success++;
 614
 615         rx_status->rate = val;
 616         rx_status->signal =
 617             rt2x00lib_calculate_link_signal(rt2x00dev, desc->rssi);
 618         rx_status->ssi = desc->rssi;
 619         rx_status->flag = desc->flags;
 620         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 621
 622         /*
 623          * Send frame to mac80211 & debugfs
 624          */
 625         get_skb_desc(skb)->frame_type = DUMP_FRAME_RXDONE;
 626         rt2x00debug_dump_frame(rt2x00dev, skb);
 627         ieee80211_rx_irqsafe(rt2x00dev->hw, skb, rx_status);
 628 }
 629 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 630
 631 /*
 632  * TX descriptor initializer
 633  */
 634 void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 635                              struct sk_buff *skb,
 636                              struct ieee80211_tx_control *control)
 637 {
 638         struct txdata_entry_desc desc;
 639         struct skb_desc *skbdesc = get_skb_desc(skb);
 640         struct ieee80211_hdr *ieee80211hdr = skbdesc->data;
 641         int tx_rate;
 642         int bitrate;
 643         int length;
 644         int duration;
 645         int residual;
 646         u16 frame_control;
 647         u16 seq_ctrl;
 648
 649         memset(&desc, 0, sizeof(desc));
 650
 651         desc.cw_min = skbdesc->ring->tx_params.cw_min;
 652         desc.cw_max = skbdesc->ring->tx_params.cw_max;
 653         desc.aifs = skbdesc->ring->tx_params.aifs;
 654
 655         /*
 656          * Identify queue
 657          */
 658         if (control->queue < rt2x00dev->hw->queues)
 659                 desc.queue = control->queue;
 660         else if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 661                  control->queue == IEEE80211_TX_QUEUE_AFTER_BEACON)
 662                 desc.queue = QUEUE_MGMT;
 663         else
 664                 desc.queue = QUEUE_OTHER;
 665
 666         /*
 667          * Read required fields from ieee80211 header.
 668          */
 669         frame_control = le16_to_cpu(ieee80211hdr->frame_control);
 670         seq_ctrl = le16_to_cpu(ieee80211hdr->seq_ctrl);
 671
 672         tx_rate = control->tx_rate;
 673
 674         /*
 675          * Check whether this frame is to be acked
 676          */
 677         if (!(control->flags & IEEE80211_TXCTL_NO_ACK))
 678                 __set_bit(ENTRY_TXD_ACK, &desc.flags);
 679
 680         /*
 681          * Check if this is a RTS/CTS frame
 682          */
 683         if (is_rts_frame(frame_control) || is_cts_frame(frame_control)) {
 684                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 685                 if (is_rts_frame(frame_control)) {
 686                         __set_bit(ENTRY_TXD_RTS_FRAME, &desc.flags);
 687                         __set_bit(ENTRY_TXD_ACK, &desc.flags);
 688                 } else
 689                         __clear_bit(ENTRY_TXD_ACK, &desc.flags);
 690                 if (control->rts_cts_rate)
 691                         tx_rate = control->rts_cts_rate;
 692         }
 693
 694         /*
 695          * Check for OFDM
 696          */
 697         if (DEVICE_GET_RATE_FIELD(tx_rate, RATEMASK) & DEV_OFDM_RATEMASK)
 698                 __set_bit(ENTRY_TXD_OFDM_RATE, &desc.flags);
 699
 700         /*
 701          * Check if more fragments are pending
 702          */
 703         if (ieee80211_get_morefrag(ieee80211hdr)) {
 704                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 705                 __set_bit(ENTRY_TXD_MORE_FRAG, &desc.flags);
 706         }
 707
 708         /*
 709          * Beacons and probe responses require the tsf timestamp
 710          * to be inserted into the frame.
 711          */
 712         if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 713             is_probe_resp(frame_control))
 714                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &desc.flags);
 715
 716         /*
 717          * Determine with what IFS priority this frame should be send.
 718          * Set ifs to IFS_SIFS when the this is not the first fragment,
 719          * or this fragment came after RTS/CTS.
 720          */
 721         if ((seq_ctrl & IEEE80211_SCTL_FRAG) > 0 ||
 722             test_bit(ENTRY_TXD_RTS_FRAME, &desc.flags))
 723                 desc.ifs = IFS_SIFS;
 724         else
 725                 desc.ifs = IFS_BACKOFF;
 726
 727         /*
 728          * PLCP setup
 729          * Length calculation depends on OFDM/CCK rate.
 730          */
 731         desc.signal = DEVICE_GET_RATE_FIELD(tx_rate, PLCP);
 732         desc.service = 0x04;
 733
 734         length = skbdesc->data_len + FCS_LEN;
 735         if (test_bit(ENTRY_TXD_OFDM_RATE, &desc.flags)) {
 736                 desc.length_high = (length >> 6) & 0x3f;
 737                 desc.length_low = length & 0x3f;
 738         } else {
 739                 bitrate = DEVICE_GET_RATE_FIELD(tx_rate, RATE);
 740
 741                 /*
 742                  * Convert length to microseconds.
 743                  */
 744                 residual = get_duration_res(length, bitrate);
 745                 duration = get_duration(length, bitrate);
 746
 747                 if (residual != 0) {
 748                         duration++;
 749
 750                         /*
 751                          * Check if we need to set the Length Extension
 752                          */
 753                         if (bitrate == 110 && residual <= 30)
 754                                 desc.service |= 0x80;
 755                 }
 756
 757                 desc.length_high = (duration >> 8) & 0xff;
 758                 desc.length_low = duration & 0xff;
 759
 760                 /*
 761                  * When preamble is enabled we should set the
 762                  * preamble bit for the signal.
 763                  */
 764                 if (DEVICE_GET_RATE_FIELD(tx_rate, PREAMBLE))
 765                         desc.signal |= 0x08;
 766         }
 767
 768         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, skb, &desc, control);
 769
 770         /*
 771          * Update ring entry.
 772          */
 773         skbdesc->entry->skb = skb;
 774         memcpy(&skbdesc->entry->tx_status.control, control, sizeof(*control));
 775
 776         /*
 777          * The frame has been completely initialized and ready
 778          * for sending to the device. The caller will push the
 779          * frame to the device, but we are going to push the
 780          * frame to debugfs here.
 781          */
 782         skbdesc->frame_type = DUMP_FRAME_TX;
 783         rt2x00debug_dump_frame(rt2x00dev, skb);
 784 }
 785 EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc);
 786
 787 /*
 788  * Driver initialization handlers.
 789  */
 790 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 791                               const int channel, const int tx_power,
 792                               const int value)
 793 {
 794         entry->chan = channel;
 795         if (channel <= 14)
 796                 entry->freq = 2407 + (5 * channel);
 797         else
 798                 entry->freq = 5000 + (5 * channel);
 799         entry->val = value;
 800         entry->flag =
 801             IEEE80211_CHAN_W_IBSS |
 802             IEEE80211_CHAN_W_ACTIVE_SCAN |
 803             IEEE80211_CHAN_W_SCAN;
 804         entry->power_level = tx_power;
 805         entry->antenna_max = 0xff;
 806 }
 807
 808 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 809                            const int rate, const int mask,
 810                            const int plcp, const int flags)
 811 {
 812         entry->rate = rate;
 813         entry->val =
 814             DEVICE_SET_RATE_FIELD(rate, RATE) |
 815             DEVICE_SET_RATE_FIELD(mask, RATEMASK) |
 816             DEVICE_SET_RATE_FIELD(plcp, PLCP);
 817         entry->flags = flags;
 818         entry->val2 = entry->val;
 819         if (entry->flags & IEEE80211_RATE_PREAMBLE2)
 820                 entry->val2 |= DEVICE_SET_RATE_FIELD(1, PREAMBLE);
 821         entry->min_rssi_ack = 0;
 822         entry->min_rssi_ack_delta = 0;
 823 }
 824
 825 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 826                                     struct hw_mode_spec *spec)
 827 {
 828         struct ieee80211_hw *hw = rt2x00dev->hw;
 829         struct ieee80211_hw_mode *hwmodes;
 830         struct ieee80211_channel *channels;
 831         struct ieee80211_rate *rates;
 832         unsigned int i;
 833         unsigned char tx_power;
 834
 835         hwmodes = kzalloc(sizeof(*hwmodes) * spec->num_modes, GFP_KERNEL);
 836         if (!hwmodes)
 837                 goto exit;
 838
 839         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 840         if (!channels)
 841                 goto exit_free_modes;
 842
 843         rates = kzalloc(sizeof(*rates) * spec->num_rates, GFP_KERNEL);
 844         if (!rates)
 845                 goto exit_free_channels;
 846
 847         /*
 848          * Initialize Rate list.
 849          */
 850         rt2x00lib_rate(&rates[0], 10, DEV_RATEMASK_1MB,
 851                        0x00, IEEE80211_RATE_CCK);
 852         rt2x00lib_rate(&rates[1], 20, DEV_RATEMASK_2MB,
 853                        0x01, IEEE80211_RATE_CCK_2);
 854         rt2x00lib_rate(&rates[2], 55, DEV_RATEMASK_5_5MB,
 855                        0x02, IEEE80211_RATE_CCK_2);
 856         rt2x00lib_rate(&rates[3], 110, DEV_RATEMASK_11MB,
 857                        0x03, IEEE80211_RATE_CCK_2);
 858
 859         if (spec->num_rates > 4) {
 860                 rt2x00lib_rate(&rates[4], 60, DEV_RATEMASK_6MB,
 861                                0x0b, IEEE80211_RATE_OFDM);
 862                 rt2x00lib_rate(&rates[5], 90, DEV_RATEMASK_9MB,
 863                                0x0f, IEEE80211_RATE_OFDM);
 864                 rt2x00lib_rate(&rates[6], 120, DEV_RATEMASK_12MB,
 865                                0x0a, IEEE80211_RATE_OFDM);
 866                 rt2x00lib_rate(&rates[7], 180, DEV_RATEMASK_18MB,
 867                                0x0e, IEEE80211_RATE_OFDM);
 868                 rt2x00lib_rate(&rates[8], 240, DEV_RATEMASK_24MB,
 869                                0x09, IEEE80211_RATE_OFDM);
 870                 rt2x00lib_rate(&rates[9], 360, DEV_RATEMASK_36MB,
 871                                0x0d, IEEE80211_RATE_OFDM);
 872                 rt2x00lib_rate(&rates[10], 480, DEV_RATEMASK_48MB,
 873                                0x08, IEEE80211_RATE_OFDM);
 874                 rt2x00lib_rate(&rates[11], 540, DEV_RATEMASK_54MB,
 875                                0x0c, IEEE80211_RATE_OFDM);
 876         }
 877
 878         /*
 879          * Initialize Channel list.
 880          */
 881         for (i = 0; i < spec->num_channels; i++) {
 882                 if (spec->channels[i].channel <= 14)
 883                         tx_power = spec->tx_power_bg[i];
 884                 else if (spec->tx_power_a)
 885                         tx_power = spec->tx_power_a[i];
 886                 else
 887                         tx_power = spec->tx_power_default;
 888
 889                 rt2x00lib_channel(&channels[i],
 890                                   spec->channels[i].channel, tx_power, i);
 891         }
 892
 893         /*
 894          * Intitialize 802.11b
 895          * Rates: CCK.
 896          * Channels: OFDM.
 897          */
 898         if (spec->num_modes > HWMODE_B) {
 899                 hwmodes[HWMODE_B].mode = MODE_IEEE80211B;
 900                 hwmodes[HWMODE_B].num_channels = 14;
 901                 hwmodes[HWMODE_B].num_rates = 4;
 902                 hwmodes[HWMODE_B].channels = channels;
 903                 hwmodes[HWMODE_B].rates = rates;
 904         }
 905
 906         /*
 907          * Intitialize 802.11g
 908          * Rates: CCK, OFDM.
 909          * Channels: OFDM.
 910          */
 911         if (spec->num_modes > HWMODE_G) {
 912                 hwmodes[HWMODE_G].mode = MODE_IEEE80211G;
 913                 hwmodes[HWMODE_G].num_channels = 14;
 914                 hwmodes[HWMODE_G].num_rates = spec->num_rates;
 915                 hwmodes[HWMODE_G].channels = channels;
 916                 hwmodes[HWMODE_G].rates = rates;
 917         }
 918
 919         /*
 920          * Intitialize 802.11a
 921          * Rates: OFDM.
 922          * Channels: OFDM, UNII, HiperLAN2.
 923          */
 924         if (spec->num_modes > HWMODE_A) {
 925                 hwmodes[HWMODE_A].mode = MODE_IEEE80211A;
 926                 hwmodes[HWMODE_A].num_channels = spec->num_channels - 14;
 927                 hwmodes[HWMODE_A].num_rates = spec->num_rates - 4;
 928                 hwmodes[HWMODE_A].channels = &channels[14];
 929                 hwmodes[HWMODE_A].rates = &rates[4];
 930         }
 931
 932         if (spec->num_modes > HWMODE_G &&
 933             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_G]))
 934                 goto exit_free_rates;
 935
 936         if (spec->num_modes > HWMODE_B &&
 937             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_B]))
 938                 goto exit_free_rates;
 939
 940         if (spec->num_modes > HWMODE_A &&
 941             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_A]))
 942                 goto exit_free_rates;
 943
 944         rt2x00dev->hwmodes = hwmodes;
 945
 946         return 0;
 947
 948 exit_free_rates:
 949         kfree(rates);
 950
 951 exit_free_channels:
 952         kfree(channels);
 953
 954 exit_free_modes:
 955         kfree(hwmodes);
 956
 957 exit:
 958         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 959         return -ENOMEM;
 960 }
 961
 962 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 963 {
 964         if (test_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags))
 965                 ieee80211_unregister_hw(rt2x00dev->hw);
 966
 967         if (likely(rt2x00dev->hwmodes)) {
 968                 kfree(rt2x00dev->hwmodes->channels);
 969                 kfree(rt2x00dev->hwmodes->rates);
 970                 kfree(rt2x00dev->hwmodes);
 971                 rt2x00dev->hwmodes = NULL;
 972         }
 973 }
 974
 975 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 976 {
 977         struct hw_mode_spec *spec = &rt2x00dev->spec;
 978         int status;
 979
 980         /*
 981          * Initialize HW modes.
 982          */
 983         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 984         if (status)
 985                 return status;
 986
 987         /*
 988          * Register HW.
 989          */
 990         status = ieee80211_register_hw(rt2x00dev->hw);
 991         if (status) {
 992                 rt2x00lib_remove_hw(rt2x00dev);
 993                 return status;
 994         }
 995
 996         __set_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags);
 997
 998         return 0;
 999 }
1000
1001 /*
1002  * Initialization/uninitialization handlers.
1003  */
1004 static int rt2x00lib_alloc_entries(struct data_ring *ring,
1005                                    const u16 max_entries, const u16 data_size,
1006                                    const u16 desc_size)
1007 {
1008         struct data_entry *entry;
1009         unsigned int i;
1010
1011         ring->stats.limit = max_entries;
1012         ring->data_size = data_size;
1013         ring->desc_size = desc_size;
1014
1015         /*
1016          * Allocate all ring entries.
1017          */
1018         entry = kzalloc(ring->stats.limit * sizeof(*entry), GFP_KERNEL);
1019         if (!entry)
1020                 return -ENOMEM;
1021
1022         for (i = 0; i < ring->stats.limit; i++) {
1023                 entry[i].flags = 0;
1024                 entry[i].ring = ring;
1025                 entry[i].skb = NULL;
1026                 entry[i].entry_idx = i;
1027         }
1028
1029         ring->entry = entry;
1030
1031         return 0;
1032 }
1033
1034 static int rt2x00lib_alloc_ring_entries(struct rt2x00_dev *rt2x00dev)
1035 {
1036         struct data_ring *ring;
1037
1038         /*
1039          * Allocate the RX ring.
1040          */
1041         if (rt2x00lib_alloc_entries(rt2x00dev->rx, RX_ENTRIES, DATA_FRAME_SIZE,
1042                                     rt2x00dev->ops->rxd_size))
1043                 return -ENOMEM;
1044
1045         /*
1046          * First allocate the TX rings.
1047          */
1048         txring_for_each(rt2x00dev, ring) {
1049                 if (rt2x00lib_alloc_entries(ring, TX_ENTRIES, DATA_FRAME_SIZE,
1050                                             rt2x00dev->ops->txd_size))
1051                         return -ENOMEM;
1052         }
1053
1054         if (!test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
1055                 return 0;
1056
1057         /*
1058          * Allocate the BEACON ring.
1059          */
1060         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[0], BEACON_ENTRIES,
1061                                     MGMT_FRAME_SIZE, rt2x00dev->ops->txd_size))
1062                 return -ENOMEM;
1063
1064         /*
1065          * Allocate the Atim ring.
1066          */
1067         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[1], ATIM_ENTRIES,
1068                                     DATA_FRAME_SIZE, rt2x00dev->ops->txd_size))
1069                 return -ENOMEM;
1070
1071         return 0;
1072 }
1073
1074 static void rt2x00lib_free_ring_entries(struct rt2x00_dev *rt2x00dev)
1075 {
1076         struct data_ring *ring;
1077
1078         ring_for_each(rt2x00dev, ring) {
1079                 kfree(ring->entry);
1080                 ring->entry = NULL;
1081         }
1082 }
1083
1084 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
1085 {
1086         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1087                 return;
1088
1089         /*
1090          * Unregister rfkill.
1091          */
1092         rt2x00rfkill_unregister(rt2x00dev);
1093
1094         /*
1095          * Allow the HW to uninitialize.
1096          */
1097         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1098
1099         /*
1100          * Free allocated ring entries.
1101          */
1102         rt2x00lib_free_ring_entries(rt2x00dev);
1103 }
1104
1105 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1106 {
1107         int status;
1108
1109         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1110                 return 0;
1111
1112         /*
1113          * Allocate all ring entries.
1114          */
1115         status = rt2x00lib_alloc_ring_entries(rt2x00dev);
1116         if (status) {
1117                 ERROR(rt2x00dev, "Ring entries allocation failed.\n");
1118                 return status;
1119         }
1120
1121         /*
1122          * Initialize the device.
1123          */
1124         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1125         if (status)
1126                 goto exit;
1127
1128         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
1129
1130         /*
1131          * Register the rfkill handler.
1132          */
1133         status = rt2x00rfkill_register(rt2x00dev);
1134         if (status)
1135                 goto exit_unitialize;
1136
1137         return 0;
1138
1139 exit_unitialize:
1140         rt2x00lib_uninitialize(rt2x00dev);
1141
1142 exit:
1143         rt2x00lib_free_ring_entries(rt2x00dev);
1144
1145         return status;
1146 }
1147
1148 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1149 {
1150         int retval;
1151
1152         if (test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1153                 return 0;
1154
1155         /*
1156          * If this is the first interface which is added,
1157          * we should load the firmware now.
1158          */
1159         if (test_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags)) {
1160                 retval = rt2x00lib_load_firmware(rt2x00dev);
1161                 if (retval)
1162                         return retval;
1163         }
1164
1165         /*
1166          * Initialize the device.
1167          */
1168         retval = rt2x00lib_initialize(rt2x00dev);
1169         if (retval)
1170                 return retval;
1171
1172         /*
1173          * Enable radio.
1174          */
1175         retval = rt2x00lib_enable_radio(rt2x00dev);
1176         if (retval) {
1177                 rt2x00lib_uninitialize(rt2x00dev);
1178                 return retval;
1179         }
1180
1181         __set_bit(DEVICE_STARTED, &rt2x00dev->flags);
1182
1183         return 0;
1184 }
1185
1186 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1187 {
1188         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1189                 return;
1190
1191         /*
1192          * Perhaps we can add something smarter here,
1193          * but for now just disabling the radio should do.
1194          */
1195         rt2x00lib_disable_radio(rt2x00dev);
1196
1197         __clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
1198 }
1199
1200 /*
1201  * driver allocation handlers.
1202  */
1203 static int rt2x00lib_alloc_rings(struct rt2x00_dev *rt2x00dev)
1204 {
1205         struct data_ring *ring;
1206         unsigned int index;
1207
1208         /*
1209          * We need the following rings:
1210          * RX: 1
1211          * TX: hw->queues
1212          * Beacon: 1 (if required)
1213          * Atim: 1 (if required)
1214          */
1215         rt2x00dev->data_rings = 1 + rt2x00dev->hw->queues +
1216             (2 * test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags));
1217
1218         ring = kzalloc(rt2x00dev->data_rings * sizeof(*ring), GFP_KERNEL);
1219         if (!ring) {
1220                 ERROR(rt2x00dev, "Ring allocation failed.\n");
1221                 return -ENOMEM;
1222         }
1223
1224         /*
1225          * Initialize pointers
1226          */
1227         rt2x00dev->rx = ring;
1228         rt2x00dev->tx = &rt2x00dev->rx[1];
1229         if (test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
1230                 rt2x00dev->bcn = &rt2x00dev->tx[rt2x00dev->hw->queues];
1231
1232         /*
1233          * Initialize ring parameters.
1234          * RX: queue_idx = 0
1235          * TX: queue_idx = IEEE80211_TX_QUEUE_DATA0 + index
1236          * TX: cw_min: 2^5 = 32.
1237          * TX: cw_max: 2^10 = 1024.
1238          */
1239         rt2x00dev->rx->rt2x00dev = rt2x00dev;
1240         rt2x00dev->rx->queue_idx = 0;
1241
1242         index = IEEE80211_TX_QUEUE_DATA0;
1243         txring_for_each(rt2x00dev, ring) {
1244                 ring->rt2x00dev = rt2x00dev;
1245                 ring->queue_idx = index++;
1246                 ring->tx_params.aifs = 2;
1247                 ring->tx_params.cw_min = 5;
1248                 ring->tx_params.cw_max = 10;
1249         }
1250
1251         return 0;
1252 }
1253
1254 static void rt2x00lib_free_rings(struct rt2x00_dev *rt2x00dev)
1255 {
1256         kfree(rt2x00dev->rx);
1257         rt2x00dev->rx = NULL;
1258         rt2x00dev->tx = NULL;
1259         rt2x00dev->bcn = NULL;
1260 }
1261
1262 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1263 {
1264         int retval = -ENOMEM;
1265
1266         /*
1267          * Let the driver probe the device to detect the capabilities.
1268          */
1269         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1270         if (retval) {
1271                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1272                 goto exit;
1273         }
1274
1275         /*
1276          * Initialize configuration work.
1277          */
1278         INIT_WORK(&rt2x00dev->beacon_work, rt2x00lib_beacondone_scheduled);
1279         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
1280         INIT_WORK(&rt2x00dev->config_work, rt2x00lib_configuration_scheduled);
1281         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
1282
1283         /*
1284          * Reset current working type.
1285          */
1286         rt2x00dev->interface.type = IEEE80211_IF_TYPE_INVALID;
1287
1288         /*
1289          * Allocate ring array.
1290          */
1291         retval = rt2x00lib_alloc_rings(rt2x00dev);
1292         if (retval)
1293                 goto exit;
1294
1295         /*
1296          * Initialize ieee80211 structure.
1297          */
1298         retval = rt2x00lib_probe_hw(rt2x00dev);
1299         if (retval) {
1300                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1301                 goto exit;
1302         }
1303
1304         /*
1305          * Allocatie rfkill.
1306          */
1307         retval = rt2x00rfkill_allocate(rt2x00dev);
1308         if (retval)
1309                 goto exit;
1310
1311         /*
1312          * Open the debugfs entry.
1313          */
1314         rt2x00debug_register(rt2x00dev);
1315
1316         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1317
1318         return 0;
1319
1320 exit:
1321         rt2x00lib_remove_dev(rt2x00dev);
1322
1323         return retval;
1324 }
1325 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1326
1327 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1328 {
1329         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1330
1331         /*
1332          * Disable radio.
1333          */
1334         rt2x00lib_disable_radio(rt2x00dev);
1335
1336         /*
1337          * Uninitialize device.
1338          */
1339         rt2x00lib_uninitialize(rt2x00dev);
1340
1341         /*
1342          * Close debugfs entry.
1343          */
1344         rt2x00debug_deregister(rt2x00dev);
1345
1346         /*
1347          * Free rfkill
1348          */
1349         rt2x00rfkill_free(rt2x00dev);
1350
1351         /*
1352          * Free ieee80211_hw memory.
1353          */
1354         rt2x00lib_remove_hw(rt2x00dev);
1355
1356         /*
1357          * Free firmware image.
1358          */
1359         rt2x00lib_free_firmware(rt2x00dev);
1360
1361         /*
1362          * Free ring structures.
1363          */
1364         rt2x00lib_free_rings(rt2x00dev);
1365 }
1366 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1367
1368 /*
1369  * Device state handlers
1370  */
1371 #ifdef CONFIG_PM
1372 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1373 {
1374         int retval;
1375
1376         NOTICE(rt2x00dev, "Going to sleep.\n");
1377         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1378
1379         /*
1380          * Only continue if mac80211 has open interfaces.
1381          */
1382         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1383                 goto exit;
1384         __set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
1385
1386         /*
1387          * Disable radio and unitialize all items
1388          * that must be recreated on resume.
1389          */
1390         rt2x00lib_stop(rt2x00dev);
1391         rt2x00lib_uninitialize(rt2x00dev);
1392         rt2x00debug_deregister(rt2x00dev);
1393
1394 exit:
1395         /*
1396          * Set device mode to sleep for power management.
1397          */
1398         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1399         if (retval)
1400                 return retval;
1401
1402         return 0;
1403 }
1404 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1405
1406 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1407 {
1408         struct interface *intf = &rt2x00dev->interface;
1409         int retval;
1410
1411         NOTICE(rt2x00dev, "Waking up.\n");
1412
1413         /*
1414          * Open the debugfs entry.
1415          */
1416         rt2x00debug_register(rt2x00dev);
1417
1418         /*
1419          * Only continue if mac80211 had open interfaces.
1420          */
1421         if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
1422                 return 0;
1423
1424         /*
1425          * Reinitialize device and all active interfaces.
1426          */
1427         retval = rt2x00lib_start(rt2x00dev);
1428         if (retval)
1429                 goto exit;
1430
1431         /*
1432          * Reconfigure device.
1433          */
1434         rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
1435         if (!rt2x00dev->hw->conf.radio_enabled)
1436                 rt2x00lib_disable_radio(rt2x00dev);
1437
1438         rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
1439         rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
1440         rt2x00lib_config_type(rt2x00dev, intf->type);
1441
1442         /*
1443          * We are ready again to receive requests from mac80211.
1444          */
1445         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1446
1447         /*
1448          * It is possible that during that mac80211 has attempted
1449          * to send frames while we were suspending or resuming.
1450          * In that case we have disabled the TX queue and should
1451          * now enable it again
1452          */
1453         ieee80211_start_queues(rt2x00dev->hw);
1454
1455         /*
1456          * When in Master or Ad-hoc mode,
1457          * restart Beacon transmitting by faking a beacondone event.
1458          */
1459         if (intf->type == IEEE80211_IF_TYPE_AP ||
1460             intf->type == IEEE80211_IF_TYPE_IBSS)
1461                 rt2x00lib_beacondone(rt2x00dev);
1462
1463         return 0;
1464
1465 exit:
1466         rt2x00lib_disable_radio(rt2x00dev);
1467         rt2x00lib_uninitialize(rt2x00dev);
1468         rt2x00debug_deregister(rt2x00dev);
1469
1470         return retval;
1471 }
1472 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1473 #endif /* CONFIG_PM */
1474
1475 /*
1476  * rt2x00lib module information.
1477  */
1478 MODULE_AUTHOR(DRV_PROJECT);
1479 MODULE_VERSION(DRV_VERSION);
1480 MODULE_DESCRIPTION("rt2x00 library");
1481 MODULE_LICENSE("GPL");