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  * Radio control handlers.
 107  */
 108 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
 109 {
 110         int status;
 111
 112         /*
 113          * Don't enable the radio twice.
 114          * And check if the hardware button has been disabled.
 115          */
 116         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 117             test_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags))
 118                 return 0;
 119
 120         /*
 121          * Enable radio.
 122          */
 123         status = rt2x00dev->ops->lib->set_device_state(rt2x00dev,
 124                                                        STATE_RADIO_ON);
 125         if (status)
 126                 return status;
 127
 128         __set_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags);
 129
 130         /*
 131          * Enable RX.
 132          */
 133         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 134
 135         /*
 136          * Start the TX queues.
 137          */
 138         ieee80211_start_queues(rt2x00dev->hw);
 139
 140         return 0;
 141 }
 142
 143 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
 144 {
 145         if (!__test_and_clear_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 146                 return;
 147
 148         /*
 149          * Stop all scheduled work.
 150          */
 151         if (work_pending(&rt2x00dev->beacon_work))
 152                 cancel_work_sync(&rt2x00dev->beacon_work);
 153         if (work_pending(&rt2x00dev->filter_work))
 154                 cancel_work_sync(&rt2x00dev->filter_work);
 155         if (work_pending(&rt2x00dev->config_work))
 156                 cancel_work_sync(&rt2x00dev->config_work);
 157
 158         /*
 159          * Stop the TX queues.
 160          */
 161         ieee80211_stop_queues(rt2x00dev->hw);
 162
 163         /*
 164          * Disable RX.
 165          */
 166         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 167
 168         /*
 169          * Disable radio.
 170          */
 171         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 172 }
 173
 174 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 175 {
 176         /*
 177          * When we are disabling the RX, we should also stop the link tuner.
 178          */
 179         if (state == STATE_RADIO_RX_OFF)
 180                 rt2x00lib_stop_link_tuner(rt2x00dev);
 181
 182         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 183
 184         /*
 185          * When we are enabling the RX, we should also start the link tuner.
 186          */
 187         if (state == STATE_RADIO_RX_ON &&
 188             is_interface_present(&rt2x00dev->interface))
 189                 rt2x00lib_start_link_tuner(rt2x00dev);
 190 }
 191
 192 static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev *rt2x00dev)
 193 {
 194         enum antenna rx = rt2x00dev->link.ant.active.rx;
 195         enum antenna tx = rt2x00dev->link.ant.active.tx;
 196         int sample_a =
 197             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_A);
 198         int sample_b =
 199             rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_B);
 200
 201         /*
 202          * We are done sampling. Now we should evaluate the results.
 203          */
 204         rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
 205
 206         /*
 207          * During the last period we have sampled the RSSI
 208          * from both antenna's. It now is time to determine
 209          * which antenna demonstrated the best performance.
 210          * When we are already on the antenna with the best
 211          * performance, then there really is nothing for us
 212          * left to do.
 213          */
 214         if (sample_a == sample_b)
 215                 return;
 216
 217         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) {
 218                 if (sample_a > sample_b && rx == ANTENNA_B)
 219                         rx = ANTENNA_A;
 220                 else if (rx == ANTENNA_A)
 221                         rx = ANTENNA_B;
 222         }
 223
 224         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY) {
 225                 if (sample_a > sample_b && tx == ANTENNA_B)
 226                         tx = ANTENNA_A;
 227                 else if (tx == ANTENNA_A)
 228                         tx = ANTENNA_B;
 229         }
 230
 231         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 232 }
 233
 234 static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
 235 {
 236         enum antenna rx = rt2x00dev->link.ant.active.rx;
 237         enum antenna tx = rt2x00dev->link.ant.active.tx;
 238         int rssi_curr = rt2x00_get_link_ant_rssi(&rt2x00dev->link);
 239         int rssi_old = rt2x00_update_ant_rssi(&rt2x00dev->link, rssi_curr);
 240
 241         /*
 242          * Legacy driver indicates that we should swap antenna's
 243          * when the difference in RSSI is greater that 5. This
 244          * also should be done when the RSSI was actually better
 245          * then the previous sample.
 246          * When the difference exceeds the threshold we should
 247          * sample the rssi from the other antenna to make a valid
 248          * comparison between the 2 antennas.
 249          */
 250         if ((rssi_curr - rssi_old) > -5 || (rssi_curr - rssi_old) < 5)
 251                 return;
 252
 253         rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;
 254
 255         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 256                 rx = (rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 257
 258         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 259                 tx = (tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 260
 261         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 262 }
 263
 264 static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
 265 {
 266         /*
 267          * Determine if software diversity is enabled for
 268          * either the TX or RX antenna (or both).
 269          * Always perform this check since within the link
 270          * tuner interval the configuration might have changed.
 271          */
 272         rt2x00dev->link.ant.flags &= ~ANTENNA_RX_DIVERSITY;
 273         rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;
 274
 275         if (rt2x00dev->hw->conf.antenna_sel_rx == 0 &&
 276             rt2x00dev->default_ant.rx != ANTENNA_SW_DIVERSITY)
 277                 rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
 278         if (rt2x00dev->hw->conf.antenna_sel_tx == 0 &&
 279             rt2x00dev->default_ant.tx != ANTENNA_SW_DIVERSITY)
 280                 rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;
 281
 282         if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&
 283             !(rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)) {
 284                 rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
 285                 return;
 286         }
 287
 288         /*
 289          * If we have only sampled the data over the last period
 290          * we should now harvest the data. Otherwise just evaluate
 291          * the data. The latter should only be performed once
 292          * every 2 seconds.
 293          */
 294         if (rt2x00dev->link.ant.flags & ANTENNA_MODE_SAMPLE)
 295                 rt2x00lib_evaluate_antenna_sample(rt2x00dev);
 296         else if (rt2x00dev->link.count & 1)
 297                 rt2x00lib_evaluate_antenna_eval(rt2x00dev);
 298 }
 299
 300 static void rt2x00lib_update_link_stats(struct link *link, int rssi)
 301 {
 302         int avg_rssi = rssi;
 303
 304         /*
 305          * Update global RSSI
 306          */
 307         if (link->qual.avg_rssi)
 308                 avg_rssi = MOVING_AVERAGE(link->qual.avg_rssi, rssi, 8);
 309         link->qual.avg_rssi = avg_rssi;
 310
 311         /*
 312          * Update antenna RSSI
 313          */
 314         if (link->ant.rssi_ant)
 315                 rssi = MOVING_AVERAGE(link->ant.rssi_ant, rssi, 8);
 316         link->ant.rssi_ant = rssi;
 317 }
 318
 319 static void rt2x00lib_precalculate_link_signal(struct link_qual *qual)
 320 {
 321         if (qual->rx_failed || qual->rx_success)
 322                 qual->rx_percentage =
 323                     (qual->rx_success * 100) /
 324                     (qual->rx_failed + qual->rx_success);
 325         else
 326                 qual->rx_percentage = 50;
 327
 328         if (qual->tx_failed || qual->tx_success)
 329                 qual->tx_percentage =
 330                     (qual->tx_success * 100) /
 331                     (qual->tx_failed + qual->tx_success);
 332         else
 333                 qual->tx_percentage = 50;
 334
 335         qual->rx_success = 0;
 336         qual->rx_failed = 0;
 337         qual->tx_success = 0;
 338         qual->tx_failed = 0;
 339 }
 340
 341 static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
 342                                            int rssi)
 343 {
 344         int rssi_percentage = 0;
 345         int signal;
 346
 347         /*
 348          * We need a positive value for the RSSI.
 349          */
 350         if (rssi < 0)
 351                 rssi += rt2x00dev->rssi_offset;
 352
 353         /*
 354          * Calculate the different percentages,
 355          * which will be used for the signal.
 356          */
 357         if (rt2x00dev->rssi_offset)
 358                 rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
 359
 360         /*
 361          * Add the individual percentages and use the WEIGHT
 362          * defines to calculate the current link signal.
 363          */
 364         signal = ((WEIGHT_RSSI * rssi_percentage) +
 365                   (WEIGHT_TX * rt2x00dev->link.qual.tx_percentage) +
 366                   (WEIGHT_RX * rt2x00dev->link.qual.rx_percentage)) / 100;
 367
 368         return (signal > 100) ? 100 : signal;
 369 }
 370
 371 static void rt2x00lib_link_tuner(struct work_struct *work)
 372 {
 373         struct rt2x00_dev *rt2x00dev =
 374             container_of(work, struct rt2x00_dev, link.work.work);
 375
 376         /*
 377          * When the radio is shutting down we should
 378          * immediately cease all link tuning.
 379          */
 380         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 381                 return;
 382
 383         /*
 384          * Update statistics.
 385          */
 386         rt2x00dev->ops->lib->link_stats(rt2x00dev, &rt2x00dev->link.qual);
 387         rt2x00dev->low_level_stats.dot11FCSErrorCount +=
 388             rt2x00dev->link.qual.rx_failed;
 389
 390         /*
 391          * Only perform the link tuning when Link tuning
 392          * has been enabled (This could have been disabled from the EEPROM).
 393          */
 394         if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
 395                 rt2x00dev->ops->lib->link_tuner(rt2x00dev);
 396
 397         /*
 398          * Evaluate antenna setup.
 399          */
 400         rt2x00lib_evaluate_antenna(rt2x00dev);
 401
 402         /*
 403          * Precalculate a portion of the link signal which is
 404          * in based on the tx/rx success/failure counters.
 405          */
 406         rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
 407
 408         /*
 409          * Increase tuner counter, and reschedule the next link tuner run.
 410          */
 411         rt2x00dev->link.count++;
 412         queue_delayed_work(rt2x00dev->hw->workqueue, &rt2x00dev->link.work,
 413                            LINK_TUNE_INTERVAL);
 414 }
 415
 416 static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
 417 {
 418         struct rt2x00_dev *rt2x00dev =
 419             container_of(work, struct rt2x00_dev, filter_work);
 420         unsigned int filter = rt2x00dev->packet_filter;
 421
 422         /*
 423          * Since we had stored the filter inside interface.filter,
 424          * we should now clear that field. Otherwise the driver will
 425          * assume nothing has changed (*total_flags will be compared
 426          * to interface.filter to determine if any action is required).
 427          */
 428         rt2x00dev->packet_filter = 0;
 429
 430         rt2x00dev->ops->hw->configure_filter(rt2x00dev->hw,
 431                                              filter, &filter, 0, NULL);
 432 }
 433
 434 static void rt2x00lib_configuration_scheduled(struct work_struct *work)
 435 {
 436         struct rt2x00_dev *rt2x00dev =
 437             container_of(work, struct rt2x00_dev, config_work);
 438         int preamble = !test_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
 439
 440         rt2x00mac_erp_ie_changed(rt2x00dev->hw,
 441                                  IEEE80211_ERP_CHANGE_PREAMBLE, 0, preamble);
 442 }
 443
 444 /*
 445  * Interrupt context handlers.
 446  */
 447 static void rt2x00lib_beacondone_scheduled(struct work_struct *work)
 448 {
 449         struct rt2x00_dev *rt2x00dev =
 450             container_of(work, struct rt2x00_dev, beacon_work);
 451         struct data_ring *ring =
 452             rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
 453         struct data_entry *entry = rt2x00_get_data_entry(ring);
 454         struct sk_buff *skb;
 455
 456         skb = ieee80211_beacon_get(rt2x00dev->hw,
 457                                    rt2x00dev->interface.id,
 458                                    &entry->tx_status.control);
 459         if (!skb)
 460                 return;
 461
 462         rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, skb,
 463                                           &entry->tx_status.control);
 464
 465         dev_kfree_skb(skb);
 466 }
 467
 468 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 469 {
 470         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 471                 return;
 472
 473         queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->beacon_work);
 474 }
 475 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 476
 477 void rt2x00lib_txdone(struct data_entry *entry,
 478                       const int status, const int retry)
 479 {
 480         struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
 481         struct ieee80211_tx_status *tx_status = &entry->tx_status;
 482         struct ieee80211_low_level_stats *stats = &rt2x00dev->low_level_stats;
 483         int success = !!(status == TX_SUCCESS || status == TX_SUCCESS_RETRY);
 484         int fail = !!(status == TX_FAIL_RETRY || status == TX_FAIL_INVALID ||
 485                       status == TX_FAIL_OTHER);
 486
 487         /*
 488          * Update TX statistics.
 489          */
 490         tx_status->flags = 0;
 491         tx_status->ack_signal = 0;
 492         tx_status->excessive_retries = (status == TX_FAIL_RETRY);
 493         tx_status->retry_count = retry;
 494         rt2x00dev->link.qual.tx_success += success;
 495         rt2x00dev->link.qual.tx_failed += retry + fail;
 496
 497         if (!(tx_status->control.flags & IEEE80211_TXCTL_NO_ACK)) {
 498                 if (success)
 499                         tx_status->flags |= IEEE80211_TX_STATUS_ACK;
 500                 else
 501                         stats->dot11ACKFailureCount++;
 502         }
 503
 504         tx_status->queue_length = entry->ring->stats.limit;
 505         tx_status->queue_number = tx_status->control.queue;
 506
 507         if (tx_status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) {
 508                 if (success)
 509                         stats->dot11RTSSuccessCount++;
 510                 else
 511                         stats->dot11RTSFailureCount++;
 512         }
 513
 514         /*
 515          * Send the tx_status to mac80211 & debugfs.
 516          * mac80211 will clean up the skb structure.
 517          */
 518         get_skb_desc(entry->skb)->frame_type = DUMP_FRAME_TXDONE;
 519         rt2x00debug_dump_frame(rt2x00dev, entry->skb);
 520         ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb, tx_status);
 521         entry->skb = NULL;
 522 }
 523 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 524
 525 void rt2x00lib_rxdone(struct data_entry *entry, struct sk_buff *skb,
 526                       struct rxdata_entry_desc *desc)
 527 {
 528         struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
 529         struct interface *intf = &rt2x00dev->interface;
 530         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 531         struct ieee80211_hw_mode *mode;
 532         struct ieee80211_rate *rate;
 533         struct ieee80211_hdr *hdr;
 534         unsigned int i;
 535         int val = 0;
 536         u16 fc;
 537
 538         /*
 539          * Update RX statistics.
 540          */
 541         mode = &rt2x00dev->hwmodes[rt2x00dev->curr_hwmode];
 542         for (i = 0; i < mode->num_rates; i++) {
 543                 rate = &mode->rates[i];
 544
 545                 /*
 546                  * When frame was received with an OFDM bitrate,
 547                  * the signal is the PLCP value. If it was received with
 548                  * a CCK bitrate the signal is the rate in 0.5kbit/s.
 549                  */
 550                 if (!desc->ofdm)
 551                         val = DEVICE_GET_RATE_FIELD(rate->val, RATE);
 552                 else
 553                         val = DEVICE_GET_RATE_FIELD(rate->val, PLCP);
 554
 555                 if (val == desc->signal) {
 556                         val = rate->val;
 557                         break;
 558                 }
 559         }
 560
 561         /*
 562          * Only update link status if this is a beacon frame carrying our
 563          * bssid.
 564          */
 565         hdr = (struct ieee80211_hdr *) skb->data;
 566         if (skb->len >= sizeof(struct ieee80211_hdr *)) {
 567                 fc = le16_to_cpu(hdr->frame_control);
 568                 if ((intf->type == IEEE80211_IF_TYPE_STA
 569                      || intf->type == IEEE80211_IF_TYPE_IBSS)
 570                     && is_beacon(fc)
 571                     && compare_ether_addr(hdr->addr3, intf->bssid) == 0)
 572                         rt2x00lib_update_link_stats(&rt2x00dev->link,
 573                                                     desc->rssi);
 574         }
 575
 576         rt2x00dev->link.qual.rx_success++;
 577
 578         rx_status->rate = val;
 579         rx_status->signal =
 580             rt2x00lib_calculate_link_signal(rt2x00dev, desc->rssi);
 581         rx_status->ssi = desc->rssi;
 582         rx_status->flag = desc->flags;
 583         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 584
 585         /*
 586          * Send frame to mac80211 & debugfs
 587          */
 588         get_skb_desc(skb)->frame_type = DUMP_FRAME_RXDONE;
 589         rt2x00debug_dump_frame(rt2x00dev, skb);
 590         ieee80211_rx_irqsafe(rt2x00dev->hw, skb, rx_status);
 591 }
 592 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 593
 594 /*
 595  * TX descriptor initializer
 596  */
 597 void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 598                              struct sk_buff *skb,
 599                              struct ieee80211_tx_control *control)
 600 {
 601         struct txdata_entry_desc desc;
 602         struct skb_desc *skbdesc = get_skb_desc(skb);
 603         struct ieee80211_hdr *ieee80211hdr = skbdesc->data;
 604         int tx_rate;
 605         int bitrate;
 606         int length;
 607         int duration;
 608         int residual;
 609         u16 frame_control;
 610         u16 seq_ctrl;
 611
 612         memset(&desc, 0, sizeof(desc));
 613
 614         desc.cw_min = skbdesc->ring->tx_params.cw_min;
 615         desc.cw_max = skbdesc->ring->tx_params.cw_max;
 616         desc.aifs = skbdesc->ring->tx_params.aifs;
 617
 618         /*
 619          * Identify queue
 620          */
 621         if (control->queue < rt2x00dev->hw->queues)
 622                 desc.queue = control->queue;
 623         else if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 624                  control->queue == IEEE80211_TX_QUEUE_AFTER_BEACON)
 625                 desc.queue = QUEUE_MGMT;
 626         else
 627                 desc.queue = QUEUE_OTHER;
 628
 629         /*
 630          * Read required fields from ieee80211 header.
 631          */
 632         frame_control = le16_to_cpu(ieee80211hdr->frame_control);
 633         seq_ctrl = le16_to_cpu(ieee80211hdr->seq_ctrl);
 634
 635         tx_rate = control->tx_rate;
 636
 637         /*
 638          * Check whether this frame is to be acked
 639          */
 640         if (!(control->flags & IEEE80211_TXCTL_NO_ACK))
 641                 __set_bit(ENTRY_TXD_ACK, &desc.flags);
 642
 643         /*
 644          * Check if this is a RTS/CTS frame
 645          */
 646         if (is_rts_frame(frame_control) || is_cts_frame(frame_control)) {
 647                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 648                 if (is_rts_frame(frame_control)) {
 649                         __set_bit(ENTRY_TXD_RTS_FRAME, &desc.flags);
 650                         __set_bit(ENTRY_TXD_ACK, &desc.flags);
 651                 } else
 652                         __clear_bit(ENTRY_TXD_ACK, &desc.flags);
 653                 if (control->rts_cts_rate)
 654                         tx_rate = control->rts_cts_rate;
 655         }
 656
 657         /*
 658          * Check for OFDM
 659          */
 660         if (DEVICE_GET_RATE_FIELD(tx_rate, RATEMASK) & DEV_OFDM_RATEMASK)
 661                 __set_bit(ENTRY_TXD_OFDM_RATE, &desc.flags);
 662
 663         /*
 664          * Check if more fragments are pending
 665          */
 666         if (ieee80211_get_morefrag(ieee80211hdr)) {
 667                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 668                 __set_bit(ENTRY_TXD_MORE_FRAG, &desc.flags);
 669         }
 670
 671         /*
 672          * Beacons and probe responses require the tsf timestamp
 673          * to be inserted into the frame.
 674          */
 675         if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 676             is_probe_resp(frame_control))
 677                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &desc.flags);
 678
 679         /*
 680          * Determine with what IFS priority this frame should be send.
 681          * Set ifs to IFS_SIFS when the this is not the first fragment,
 682          * or this fragment came after RTS/CTS.
 683          */
 684         if ((seq_ctrl & IEEE80211_SCTL_FRAG) > 0 ||
 685             test_bit(ENTRY_TXD_RTS_FRAME, &desc.flags))
 686                 desc.ifs = IFS_SIFS;
 687         else
 688                 desc.ifs = IFS_BACKOFF;
 689
 690         /*
 691          * PLCP setup
 692          * Length calculation depends on OFDM/CCK rate.
 693          */
 694         desc.signal = DEVICE_GET_RATE_FIELD(tx_rate, PLCP);
 695         desc.service = 0x04;
 696
 697         length = skbdesc->data_len + FCS_LEN;
 698         if (test_bit(ENTRY_TXD_OFDM_RATE, &desc.flags)) {
 699                 desc.length_high = (length >> 6) & 0x3f;
 700                 desc.length_low = length & 0x3f;
 701         } else {
 702                 bitrate = DEVICE_GET_RATE_FIELD(tx_rate, RATE);
 703
 704                 /*
 705                  * Convert length to microseconds.
 706                  */
 707                 residual = get_duration_res(length, bitrate);
 708                 duration = get_duration(length, bitrate);
 709
 710                 if (residual != 0) {
 711                         duration++;
 712
 713                         /*
 714                          * Check if we need to set the Length Extension
 715                          */
 716                         if (bitrate == 110 && residual <= 30)
 717                                 desc.service |= 0x80;
 718                 }
 719
 720                 desc.length_high = (duration >> 8) & 0xff;
 721                 desc.length_low = duration & 0xff;
 722
 723                 /*
 724                  * When preamble is enabled we should set the
 725                  * preamble bit for the signal.
 726                  */
 727                 if (DEVICE_GET_RATE_FIELD(tx_rate, PREAMBLE))
 728                         desc.signal |= 0x08;
 729         }
 730
 731         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, skb, &desc, control);
 732
 733         /*
 734          * Update ring entry.
 735          */
 736         skbdesc->entry->skb = skb;
 737         memcpy(&skbdesc->entry->tx_status.control, control, sizeof(*control));
 738
 739         /*
 740          * The frame has been completely initialized and ready
 741          * for sending to the device. The caller will push the
 742          * frame to the device, but we are going to push the
 743          * frame to debugfs here.
 744          */
 745         skbdesc->frame_type = DUMP_FRAME_TX;
 746         rt2x00debug_dump_frame(rt2x00dev, skb);
 747 }
 748 EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc);
 749
 750 /*
 751  * Driver initialization handlers.
 752  */
 753 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 754                               const int channel, const int tx_power,
 755                               const int value)
 756 {
 757         entry->chan = channel;
 758         if (channel <= 14)
 759                 entry->freq = 2407 + (5 * channel);
 760         else
 761                 entry->freq = 5000 + (5 * channel);
 762         entry->val = value;
 763         entry->flag =
 764             IEEE80211_CHAN_W_IBSS |
 765             IEEE80211_CHAN_W_ACTIVE_SCAN |
 766             IEEE80211_CHAN_W_SCAN;
 767         entry->power_level = tx_power;
 768         entry->antenna_max = 0xff;
 769 }
 770
 771 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 772                            const int rate, const int mask,
 773                            const int plcp, const int flags)
 774 {
 775         entry->rate = rate;
 776         entry->val =
 777             DEVICE_SET_RATE_FIELD(rate, RATE) |
 778             DEVICE_SET_RATE_FIELD(mask, RATEMASK) |
 779             DEVICE_SET_RATE_FIELD(plcp, PLCP);
 780         entry->flags = flags;
 781         entry->val2 = entry->val;
 782         if (entry->flags & IEEE80211_RATE_PREAMBLE2)
 783                 entry->val2 |= DEVICE_SET_RATE_FIELD(1, PREAMBLE);
 784         entry->min_rssi_ack = 0;
 785         entry->min_rssi_ack_delta = 0;
 786 }
 787
 788 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 789                                     struct hw_mode_spec *spec)
 790 {
 791         struct ieee80211_hw *hw = rt2x00dev->hw;
 792         struct ieee80211_hw_mode *hwmodes;
 793         struct ieee80211_channel *channels;
 794         struct ieee80211_rate *rates;
 795         unsigned int i;
 796         unsigned char tx_power;
 797
 798         hwmodes = kzalloc(sizeof(*hwmodes) * spec->num_modes, GFP_KERNEL);
 799         if (!hwmodes)
 800                 goto exit;
 801
 802         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 803         if (!channels)
 804                 goto exit_free_modes;
 805
 806         rates = kzalloc(sizeof(*rates) * spec->num_rates, GFP_KERNEL);
 807         if (!rates)
 808                 goto exit_free_channels;
 809
 810         /*
 811          * Initialize Rate list.
 812          */
 813         rt2x00lib_rate(&rates[0], 10, DEV_RATEMASK_1MB,
 814                        0x00, IEEE80211_RATE_CCK);
 815         rt2x00lib_rate(&rates[1], 20, DEV_RATEMASK_2MB,
 816                        0x01, IEEE80211_RATE_CCK_2);
 817         rt2x00lib_rate(&rates[2], 55, DEV_RATEMASK_5_5MB,
 818                        0x02, IEEE80211_RATE_CCK_2);
 819         rt2x00lib_rate(&rates[3], 110, DEV_RATEMASK_11MB,
 820                        0x03, IEEE80211_RATE_CCK_2);
 821
 822         if (spec->num_rates > 4) {
 823                 rt2x00lib_rate(&rates[4], 60, DEV_RATEMASK_6MB,
 824                                0x0b, IEEE80211_RATE_OFDM);
 825                 rt2x00lib_rate(&rates[5], 90, DEV_RATEMASK_9MB,
 826                                0x0f, IEEE80211_RATE_OFDM);
 827                 rt2x00lib_rate(&rates[6], 120, DEV_RATEMASK_12MB,
 828                                0x0a, IEEE80211_RATE_OFDM);
 829                 rt2x00lib_rate(&rates[7], 180, DEV_RATEMASK_18MB,
 830                                0x0e, IEEE80211_RATE_OFDM);
 831                 rt2x00lib_rate(&rates[8], 240, DEV_RATEMASK_24MB,
 832                                0x09, IEEE80211_RATE_OFDM);
 833                 rt2x00lib_rate(&rates[9], 360, DEV_RATEMASK_36MB,
 834                                0x0d, IEEE80211_RATE_OFDM);
 835                 rt2x00lib_rate(&rates[10], 480, DEV_RATEMASK_48MB,
 836                                0x08, IEEE80211_RATE_OFDM);
 837                 rt2x00lib_rate(&rates[11], 540, DEV_RATEMASK_54MB,
 838                                0x0c, IEEE80211_RATE_OFDM);
 839         }
 840
 841         /*
 842          * Initialize Channel list.
 843          */
 844         for (i = 0; i < spec->num_channels; i++) {
 845                 if (spec->channels[i].channel <= 14)
 846                         tx_power = spec->tx_power_bg[i];
 847                 else if (spec->tx_power_a)
 848                         tx_power = spec->tx_power_a[i];
 849                 else
 850                         tx_power = spec->tx_power_default;
 851
 852                 rt2x00lib_channel(&channels[i],
 853                                   spec->channels[i].channel, tx_power, i);
 854         }
 855
 856         /*
 857          * Intitialize 802.11b
 858          * Rates: CCK.
 859          * Channels: OFDM.
 860          */
 861         if (spec->num_modes > HWMODE_B) {
 862                 hwmodes[HWMODE_B].mode = MODE_IEEE80211B;
 863                 hwmodes[HWMODE_B].num_channels = 14;
 864                 hwmodes[HWMODE_B].num_rates = 4;
 865                 hwmodes[HWMODE_B].channels = channels;
 866                 hwmodes[HWMODE_B].rates = rates;
 867         }
 868
 869         /*
 870          * Intitialize 802.11g
 871          * Rates: CCK, OFDM.
 872          * Channels: OFDM.
 873          */
 874         if (spec->num_modes > HWMODE_G) {
 875                 hwmodes[HWMODE_G].mode = MODE_IEEE80211G;
 876                 hwmodes[HWMODE_G].num_channels = 14;
 877                 hwmodes[HWMODE_G].num_rates = spec->num_rates;
 878                 hwmodes[HWMODE_G].channels = channels;
 879                 hwmodes[HWMODE_G].rates = rates;
 880         }
 881
 882         /*
 883          * Intitialize 802.11a
 884          * Rates: OFDM.
 885          * Channels: OFDM, UNII, HiperLAN2.
 886          */
 887         if (spec->num_modes > HWMODE_A) {
 888                 hwmodes[HWMODE_A].mode = MODE_IEEE80211A;
 889                 hwmodes[HWMODE_A].num_channels = spec->num_channels - 14;
 890                 hwmodes[HWMODE_A].num_rates = spec->num_rates - 4;
 891                 hwmodes[HWMODE_A].channels = &channels[14];
 892                 hwmodes[HWMODE_A].rates = &rates[4];
 893         }
 894
 895         if (spec->num_modes > HWMODE_G &&
 896             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_G]))
 897                 goto exit_free_rates;
 898
 899         if (spec->num_modes > HWMODE_B &&
 900             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_B]))
 901                 goto exit_free_rates;
 902
 903         if (spec->num_modes > HWMODE_A &&
 904             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_A]))
 905                 goto exit_free_rates;
 906
 907         rt2x00dev->hwmodes = hwmodes;
 908
 909         return 0;
 910
 911 exit_free_rates:
 912         kfree(rates);
 913
 914 exit_free_channels:
 915         kfree(channels);
 916
 917 exit_free_modes:
 918         kfree(hwmodes);
 919
 920 exit:
 921         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 922         return -ENOMEM;
 923 }
 924
 925 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 926 {
 927         if (test_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags))
 928                 ieee80211_unregister_hw(rt2x00dev->hw);
 929
 930         if (likely(rt2x00dev->hwmodes)) {
 931                 kfree(rt2x00dev->hwmodes->channels);
 932                 kfree(rt2x00dev->hwmodes->rates);
 933                 kfree(rt2x00dev->hwmodes);
 934                 rt2x00dev->hwmodes = NULL;
 935         }
 936 }
 937
 938 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 939 {
 940         struct hw_mode_spec *spec = &rt2x00dev->spec;
 941         int status;
 942
 943         /*
 944          * Initialize HW modes.
 945          */
 946         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 947         if (status)
 948                 return status;
 949
 950         /*
 951          * Register HW.
 952          */
 953         status = ieee80211_register_hw(rt2x00dev->hw);
 954         if (status) {
 955                 rt2x00lib_remove_hw(rt2x00dev);
 956                 return status;
 957         }
 958
 959         __set_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags);
 960
 961         return 0;
 962 }
 963
 964 /*
 965  * Initialization/uninitialization handlers.
 966  */
 967 static int rt2x00lib_alloc_entries(struct data_ring *ring,
 968                                    const u16 max_entries, const u16 data_size,
 969                                    const u16 desc_size)
 970 {
 971         struct data_entry *entry;
 972         unsigned int i;
 973
 974         ring->stats.limit = max_entries;
 975         ring->data_size = data_size;
 976         ring->desc_size = desc_size;
 977
 978         /*
 979          * Allocate all ring entries.
 980          */
 981         entry = kzalloc(ring->stats.limit * sizeof(*entry), GFP_KERNEL);
 982         if (!entry)
 983                 return -ENOMEM;
 984
 985         for (i = 0; i < ring->stats.limit; i++) {
 986                 entry[i].flags = 0;
 987                 entry[i].ring = ring;
 988                 entry[i].skb = NULL;
 989                 entry[i].entry_idx = i;
 990         }
 991
 992         ring->entry = entry;
 993
 994         return 0;
 995 }
 996
 997 static int rt2x00lib_alloc_ring_entries(struct rt2x00_dev *rt2x00dev)
 998 {
 999         struct data_ring *ring;
1000
1001         /*
1002          * Allocate the RX ring.
1003          */
1004         if (rt2x00lib_alloc_entries(rt2x00dev->rx, RX_ENTRIES, DATA_FRAME_SIZE,
1005                                     rt2x00dev->ops->rxd_size))
1006                 return -ENOMEM;
1007
1008         /*
1009          * First allocate the TX rings.
1010          */
1011         txring_for_each(rt2x00dev, ring) {
1012                 if (rt2x00lib_alloc_entries(ring, TX_ENTRIES, DATA_FRAME_SIZE,
1013                                             rt2x00dev->ops->txd_size))
1014                         return -ENOMEM;
1015         }
1016
1017         if (!test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
1018                 return 0;
1019
1020         /*
1021          * Allocate the BEACON ring.
1022          */
1023         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[0], BEACON_ENTRIES,
1024                                     MGMT_FRAME_SIZE, rt2x00dev->ops->txd_size))
1025                 return -ENOMEM;
1026
1027         /*
1028          * Allocate the Atim ring.
1029          */
1030         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[1], ATIM_ENTRIES,
1031                                     DATA_FRAME_SIZE, rt2x00dev->ops->txd_size))
1032                 return -ENOMEM;
1033
1034         return 0;
1035 }
1036
1037 static void rt2x00lib_free_ring_entries(struct rt2x00_dev *rt2x00dev)
1038 {
1039         struct data_ring *ring;
1040
1041         ring_for_each(rt2x00dev, ring) {
1042                 kfree(ring->entry);
1043                 ring->entry = NULL;
1044         }
1045 }
1046
1047 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
1048 {
1049         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1050                 return;
1051
1052         /*
1053          * Unregister rfkill.
1054          */
1055         rt2x00rfkill_unregister(rt2x00dev);
1056
1057         /*
1058          * Allow the HW to uninitialize.
1059          */
1060         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1061
1062         /*
1063          * Free allocated ring entries.
1064          */
1065         rt2x00lib_free_ring_entries(rt2x00dev);
1066 }
1067
1068 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1069 {
1070         int status;
1071
1072         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1073                 return 0;
1074
1075         /*
1076          * Allocate all ring entries.
1077          */
1078         status = rt2x00lib_alloc_ring_entries(rt2x00dev);
1079         if (status) {
1080                 ERROR(rt2x00dev, "Ring entries allocation failed.\n");
1081                 return status;
1082         }
1083
1084         /*
1085          * Initialize the device.
1086          */
1087         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1088         if (status)
1089                 goto exit;
1090
1091         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
1092
1093         /*
1094          * Register the rfkill handler.
1095          */
1096         status = rt2x00rfkill_register(rt2x00dev);
1097         if (status)
1098                 goto exit_unitialize;
1099
1100         return 0;
1101
1102 exit_unitialize:
1103         rt2x00lib_uninitialize(rt2x00dev);
1104
1105 exit:
1106         rt2x00lib_free_ring_entries(rt2x00dev);
1107
1108         return status;
1109 }
1110
1111 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1112 {
1113         int retval;
1114
1115         if (test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1116                 return 0;
1117
1118         /*
1119          * If this is the first interface which is added,
1120          * we should load the firmware now.
1121          */
1122         if (test_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags)) {
1123                 retval = rt2x00lib_load_firmware(rt2x00dev);
1124                 if (retval)
1125                         return retval;
1126         }
1127
1128         /*
1129          * Initialize the device.
1130          */
1131         retval = rt2x00lib_initialize(rt2x00dev);
1132         if (retval)
1133                 return retval;
1134
1135         /*
1136          * Enable radio.
1137          */
1138         retval = rt2x00lib_enable_radio(rt2x00dev);
1139         if (retval) {
1140                 rt2x00lib_uninitialize(rt2x00dev);
1141                 return retval;
1142         }
1143
1144         __set_bit(DEVICE_STARTED, &rt2x00dev->flags);
1145
1146         return 0;
1147 }
1148
1149 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1150 {
1151         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1152                 return;
1153
1154         /*
1155          * Perhaps we can add something smarter here,
1156          * but for now just disabling the radio should do.
1157          */
1158         rt2x00lib_disable_radio(rt2x00dev);
1159
1160         __clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
1161 }
1162
1163 /*
1164  * driver allocation handlers.
1165  */
1166 static int rt2x00lib_alloc_rings(struct rt2x00_dev *rt2x00dev)
1167 {
1168         struct data_ring *ring;
1169         unsigned int index;
1170
1171         /*
1172          * We need the following rings:
1173          * RX: 1
1174          * TX: hw->queues
1175          * Beacon: 1 (if required)
1176          * Atim: 1 (if required)
1177          */
1178         rt2x00dev->data_rings = 1 + rt2x00dev->hw->queues +
1179             (2 * test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags));
1180
1181         ring = kzalloc(rt2x00dev->data_rings * sizeof(*ring), GFP_KERNEL);
1182         if (!ring) {
1183                 ERROR(rt2x00dev, "Ring allocation failed.\n");
1184                 return -ENOMEM;
1185         }
1186
1187         /*
1188          * Initialize pointers
1189          */
1190         rt2x00dev->rx = ring;
1191         rt2x00dev->tx = &rt2x00dev->rx[1];
1192         if (test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
1193                 rt2x00dev->bcn = &rt2x00dev->tx[rt2x00dev->hw->queues];
1194
1195         /*
1196          * Initialize ring parameters.
1197          * cw_min: 2^5 = 32.
1198          * cw_max: 2^10 = 1024.
1199          */
1200         index = 0;
1201         ring_for_each(rt2x00dev, ring) {
1202                 ring->rt2x00dev = rt2x00dev;
1203                 ring->queue_idx = index++;
1204                 ring->tx_params.aifs = 2;
1205                 ring->tx_params.cw_min = 5;
1206                 ring->tx_params.cw_max = 10;
1207         }
1208
1209         return 0;
1210 }
1211
1212 static void rt2x00lib_free_rings(struct rt2x00_dev *rt2x00dev)
1213 {
1214         kfree(rt2x00dev->rx);
1215         rt2x00dev->rx = NULL;
1216         rt2x00dev->tx = NULL;
1217         rt2x00dev->bcn = NULL;
1218 }
1219
1220 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1221 {
1222         int retval = -ENOMEM;
1223
1224         /*
1225          * Let the driver probe the device to detect the capabilities.
1226          */
1227         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1228         if (retval) {
1229                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1230                 goto exit;
1231         }
1232
1233         /*
1234          * Initialize configuration work.
1235          */
1236         INIT_WORK(&rt2x00dev->beacon_work, rt2x00lib_beacondone_scheduled);
1237         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
1238         INIT_WORK(&rt2x00dev->config_work, rt2x00lib_configuration_scheduled);
1239         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
1240
1241         /*
1242          * Reset current working type.
1243          */
1244         rt2x00dev->interface.type = IEEE80211_IF_TYPE_INVALID;
1245
1246         /*
1247          * Allocate ring array.
1248          */
1249         retval = rt2x00lib_alloc_rings(rt2x00dev);
1250         if (retval)
1251                 goto exit;
1252
1253         /*
1254          * Initialize ieee80211 structure.
1255          */
1256         retval = rt2x00lib_probe_hw(rt2x00dev);
1257         if (retval) {
1258                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1259                 goto exit;
1260         }
1261
1262         /*
1263          * Allocatie rfkill.
1264          */
1265         retval = rt2x00rfkill_allocate(rt2x00dev);
1266         if (retval)
1267                 goto exit;
1268
1269         /*
1270          * Open the debugfs entry.
1271          */
1272         rt2x00debug_register(rt2x00dev);
1273
1274         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1275
1276         return 0;
1277
1278 exit:
1279         rt2x00lib_remove_dev(rt2x00dev);
1280
1281         return retval;
1282 }
1283 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1284
1285 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1286 {
1287         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1288
1289         /*
1290          * Disable radio.
1291          */
1292         rt2x00lib_disable_radio(rt2x00dev);
1293
1294         /*
1295          * Uninitialize device.
1296          */
1297         rt2x00lib_uninitialize(rt2x00dev);
1298
1299         /*
1300          * Close debugfs entry.
1301          */
1302         rt2x00debug_deregister(rt2x00dev);
1303
1304         /*
1305          * Free rfkill
1306          */
1307         rt2x00rfkill_free(rt2x00dev);
1308
1309         /*
1310          * Free ieee80211_hw memory.
1311          */
1312         rt2x00lib_remove_hw(rt2x00dev);
1313
1314         /*
1315          * Free firmware image.
1316          */
1317         rt2x00lib_free_firmware(rt2x00dev);
1318
1319         /*
1320          * Free ring structures.
1321          */
1322         rt2x00lib_free_rings(rt2x00dev);
1323 }
1324 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1325
1326 /*
1327  * Device state handlers
1328  */
1329 #ifdef CONFIG_PM
1330 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1331 {
1332         int retval;
1333
1334         NOTICE(rt2x00dev, "Going to sleep.\n");
1335         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1336
1337         /*
1338          * Only continue if mac80211 has open interfaces.
1339          */
1340         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1341                 goto exit;
1342         __set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
1343
1344         /*
1345          * Disable radio and unitialize all items
1346          * that must be recreated on resume.
1347          */
1348         rt2x00lib_stop(rt2x00dev);
1349         rt2x00lib_uninitialize(rt2x00dev);
1350         rt2x00debug_deregister(rt2x00dev);
1351
1352 exit:
1353         /*
1354          * Set device mode to sleep for power management.
1355          */
1356         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1357         if (retval)
1358                 return retval;
1359
1360         return 0;
1361 }
1362 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1363
1364 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1365 {
1366         struct interface *intf = &rt2x00dev->interface;
1367         int retval;
1368
1369         NOTICE(rt2x00dev, "Waking up.\n");
1370
1371         /*
1372          * Open the debugfs entry.
1373          */
1374         rt2x00debug_register(rt2x00dev);
1375
1376         /*
1377          * Only continue if mac80211 had open interfaces.
1378          */
1379         if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
1380                 return 0;
1381
1382         /*
1383          * Reinitialize device and all active interfaces.
1384          */
1385         retval = rt2x00lib_start(rt2x00dev);
1386         if (retval)
1387                 goto exit;
1388
1389         /*
1390          * Reconfigure device.
1391          */
1392         rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
1393         if (!rt2x00dev->hw->conf.radio_enabled)
1394                 rt2x00lib_disable_radio(rt2x00dev);
1395
1396         rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
1397         rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
1398         rt2x00lib_config_type(rt2x00dev, intf->type);
1399
1400         /*
1401          * We are ready again to receive requests from mac80211.
1402          */
1403         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1404
1405         /*
1406          * It is possible that during that mac80211 has attempted
1407          * to send frames while we were suspending or resuming.
1408          * In that case we have disabled the TX queue and should
1409          * now enable it again
1410          */
1411         ieee80211_start_queues(rt2x00dev->hw);
1412
1413         /*
1414          * When in Master or Ad-hoc mode,
1415          * restart Beacon transmitting by faking a beacondone event.
1416          */
1417         if (intf->type == IEEE80211_IF_TYPE_AP ||
1418             intf->type == IEEE80211_IF_TYPE_IBSS)
1419                 rt2x00lib_beacondone(rt2x00dev);
1420
1421         return 0;
1422
1423 exit:
1424         rt2x00lib_disable_radio(rt2x00dev);
1425         rt2x00lib_uninitialize(rt2x00dev);
1426         rt2x00debug_deregister(rt2x00dev);
1427
1428         return retval;
1429 }
1430 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1431 #endif /* CONFIG_PM */
1432
1433 /*
1434  * rt2x00lib module information.
1435  */
1436 MODULE_AUTHOR(DRV_PROJECT);
1437 MODULE_VERSION(DRV_VERSION);
1438 MODULE_DESCRIPTION("rt2x00 library");
1439 MODULE_LICENSE("GPL");