err.no Git - linux-2.6/blob - 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                 if (sample_a > sample_b && rx == ANTENNA_B)
 265                         rx = ANTENNA_A;
 266                 else if (rx == ANTENNA_A)
 267                         rx = ANTENNA_B;
 268         }
 269
 270         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY) {
 271                 if (sample_a > sample_b && tx == ANTENNA_B)
 272                         tx = ANTENNA_A;
 273                 else if (tx == ANTENNA_A)
 274                         tx = ANTENNA_B;
 275         }
 276
 277         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 278 }
 279
 280 static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
 281 {
 282         enum antenna rx = rt2x00dev->link.ant.active.rx;
 283         enum antenna tx = rt2x00dev->link.ant.active.tx;
 284         int rssi_curr = rt2x00_get_link_ant_rssi(&rt2x00dev->link);
 285         int rssi_old = rt2x00_update_ant_rssi(&rt2x00dev->link, rssi_curr);
 286
 287         /*
 288          * Legacy driver indicates that we should swap antenna's
 289          * when the difference in RSSI is greater that 5. This
 290          * also should be done when the RSSI was actually better
 291          * then the previous sample.
 292          * When the difference exceeds the threshold we should
 293          * sample the rssi from the other antenna to make a valid
 294          * comparison between the 2 antennas.
 295          */
 296         if ((rssi_curr - rssi_old) > -5 || (rssi_curr - rssi_old) < 5)
 297                 return;
 298
 299         rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;
 300
 301         if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
 302                 rx = (rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 303
 304         if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
 305                 tx = (tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
 306
 307         rt2x00lib_config_antenna(rt2x00dev, rx, tx);
 308 }
 309
 310 static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
 311 {
 312         /*
 313          * Determine if software diversity is enabled for
 314          * either the TX or RX antenna (or both).
 315          * Always perform this check since within the link
 316          * tuner interval the configuration might have changed.
 317          */
 318         rt2x00dev->link.ant.flags &= ~ANTENNA_RX_DIVERSITY;
 319         rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;
 320
 321         if (rt2x00dev->hw->conf.antenna_sel_rx == 0 &&
 322             rt2x00dev->default_ant.rx != ANTENNA_SW_DIVERSITY)
 323                 rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
 324         if (rt2x00dev->hw->conf.antenna_sel_tx == 0 &&
 325             rt2x00dev->default_ant.tx != ANTENNA_SW_DIVERSITY)
 326                 rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;
 327
 328         if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&
 329             !(rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)) {
 330                 rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
 331                 return;
 332         }
 333
 334         /*
 335          * If we have only sampled the data over the last period
 336          * we should now harvest the data. Otherwise just evaluate
 337          * the data. The latter should only be performed once
 338          * every 2 seconds.
 339          */
 340         if (rt2x00dev->link.ant.flags & ANTENNA_MODE_SAMPLE)
 341                 rt2x00lib_evaluate_antenna_sample(rt2x00dev);
 342         else if (rt2x00dev->link.count & 1)
 343                 rt2x00lib_evaluate_antenna_eval(rt2x00dev);
 344 }
 345
 346 static void rt2x00lib_update_link_stats(struct link *link, int rssi)
 347 {
 348         int avg_rssi = rssi;
 349
 350         /*
 351          * Update global RSSI
 352          */
 353         if (link->qual.avg_rssi)
 354                 avg_rssi = MOVING_AVERAGE(link->qual.avg_rssi, rssi, 8);
 355         link->qual.avg_rssi = avg_rssi;
 356
 357         /*
 358          * Update antenna RSSI
 359          */
 360         if (link->ant.rssi_ant)
 361                 rssi = MOVING_AVERAGE(link->ant.rssi_ant, rssi, 8);
 362         link->ant.rssi_ant = rssi;
 363 }
 364
 365 static void rt2x00lib_precalculate_link_signal(struct link_qual *qual)
 366 {
 367         if (qual->rx_failed || qual->rx_success)
 368                 qual->rx_percentage =
 369                     (qual->rx_success * 100) /
 370                     (qual->rx_failed + qual->rx_success);
 371         else
 372                 qual->rx_percentage = 50;
 373
 374         if (qual->tx_failed || qual->tx_success)
 375                 qual->tx_percentage =
 376                     (qual->tx_success * 100) /
 377                     (qual->tx_failed + qual->tx_success);
 378         else
 379                 qual->tx_percentage = 50;
 380
 381         qual->rx_success = 0;
 382         qual->rx_failed = 0;
 383         qual->tx_success = 0;
 384         qual->tx_failed = 0;
 385 }
 386
 387 static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
 388                                            int rssi)
 389 {
 390         int rssi_percentage = 0;
 391         int signal;
 392
 393         /*
 394          * We need a positive value for the RSSI.
 395          */
 396         if (rssi < 0)
 397                 rssi += rt2x00dev->rssi_offset;
 398
 399         /*
 400          * Calculate the different percentages,
 401          * which will be used for the signal.
 402          */
 403         if (rt2x00dev->rssi_offset)
 404                 rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
 405
 406         /*
 407          * Add the individual percentages and use the WEIGHT
 408          * defines to calculate the current link signal.
 409          */
 410         signal = ((WEIGHT_RSSI * rssi_percentage) +
 411                   (WEIGHT_TX * rt2x00dev->link.qual.tx_percentage) +
 412                   (WEIGHT_RX * rt2x00dev->link.qual.rx_percentage)) / 100;
 413
 414         return (signal > 100) ? 100 : signal;
 415 }
 416
 417 static void rt2x00lib_link_tuner(struct work_struct *work)
 418 {
 419         struct rt2x00_dev *rt2x00dev =
 420             container_of(work, struct rt2x00_dev, link.work.work);
 421
 422         /*
 423          * When the radio is shutting down we should
 424          * immediately cease all link tuning.
 425          */
 426         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 427                 return;
 428
 429         /*
 430          * Update statistics.
 431          */
 432         rt2x00dev->ops->lib->link_stats(rt2x00dev, &rt2x00dev->link.qual);
 433         rt2x00dev->low_level_stats.dot11FCSErrorCount +=
 434             rt2x00dev->link.qual.rx_failed;
 435
 436         /*
 437          * Only perform the link tuning when Link tuning
 438          * has been enabled (This could have been disabled from the EEPROM).
 439          */
 440         if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
 441                 rt2x00dev->ops->lib->link_tuner(rt2x00dev);
 442
 443         /*
 444          * Evaluate antenna setup.
 445          */
 446         rt2x00lib_evaluate_antenna(rt2x00dev);
 447
 448         /*
 449          * Precalculate a portion of the link signal which is
 450          * in based on the tx/rx success/failure counters.
 451          */
 452         rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
 453
 454         /*
 455          * Increase tuner counter, and reschedule the next link tuner run.
 456          */
 457         rt2x00dev->link.count++;
 458         queue_delayed_work(rt2x00dev->hw->workqueue, &rt2x00dev->link.work,
 459                            LINK_TUNE_INTERVAL);
 460 }
 461
 462 static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
 463 {
 464         struct rt2x00_dev *rt2x00dev =
 465             container_of(work, struct rt2x00_dev, filter_work);
 466         unsigned int filter = rt2x00dev->packet_filter;
 467
 468         /*
 469          * Since we had stored the filter inside interface.filter,
 470          * we should now clear that field. Otherwise the driver will
 471          * assume nothing has changed (*total_flags will be compared
 472          * to interface.filter to determine if any action is required).
 473          */
 474         rt2x00dev->packet_filter = 0;
 475
 476         rt2x00dev->ops->hw->configure_filter(rt2x00dev->hw,
 477                                              filter, &filter, 0, NULL);
 478 }
 479
 480 static void rt2x00lib_configuration_scheduled(struct work_struct *work)
 481 {
 482         struct rt2x00_dev *rt2x00dev =
 483             container_of(work, struct rt2x00_dev, config_work);
 484         int preamble = !test_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
 485
 486         rt2x00mac_erp_ie_changed(rt2x00dev->hw,
 487                                  IEEE80211_ERP_CHANGE_PREAMBLE, 0, preamble);
 488 }
 489
 490 /*
 491  * Interrupt context handlers.
 492  */
 493 static void rt2x00lib_beacondone_scheduled(struct work_struct *work)
 494 {
 495         struct rt2x00_dev *rt2x00dev =
 496             container_of(work, struct rt2x00_dev, beacon_work);
 497         struct data_ring *ring =
 498             rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
 499         struct data_entry *entry = rt2x00_get_data_entry(ring);
 500         struct sk_buff *skb;
 501
 502         skb = ieee80211_beacon_get(rt2x00dev->hw,
 503                                    rt2x00dev->interface.id,
 504                                    &entry->tx_status.control);
 505         if (!skb)
 506                 return;
 507
 508         rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, skb,
 509                                           &entry->tx_status.control);
 510
 511         dev_kfree_skb(skb);
 512 }
 513
 514 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 515 {
 516         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 517                 return;
 518
 519         queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->beacon_work);
 520 }
 521 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 522
 523 void rt2x00lib_txdone(struct data_entry *entry,
 524                       const int status, const int retry)
 525 {
 526         struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
 527         struct ieee80211_tx_status *tx_status = &entry->tx_status;
 528         struct ieee80211_low_level_stats *stats = &rt2x00dev->low_level_stats;
 529         int success = !!(status == TX_SUCCESS || status == TX_SUCCESS_RETRY);
 530         int fail = !!(status == TX_FAIL_RETRY || status == TX_FAIL_INVALID ||
 531                       status == TX_FAIL_OTHER);
 532
 533         /*
 534          * Update TX statistics.
 535          */
 536         tx_status->flags = 0;
 537         tx_status->ack_signal = 0;
 538         tx_status->excessive_retries = (status == TX_FAIL_RETRY);
 539         tx_status->retry_count = retry;
 540         rt2x00dev->link.qual.tx_success += success;
 541         rt2x00dev->link.qual.tx_failed += retry + fail;
 542
 543         if (!(tx_status->control.flags & IEEE80211_TXCTL_NO_ACK)) {
 544                 if (success)
 545                         tx_status->flags |= IEEE80211_TX_STATUS_ACK;
 546                 else
 547                         stats->dot11ACKFailureCount++;
 548         }
 549
 550         tx_status->queue_length = entry->ring->stats.limit;
 551         tx_status->queue_number = tx_status->control.queue;
 552
 553         if (tx_status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) {
 554                 if (success)
 555                         stats->dot11RTSSuccessCount++;
 556                 else
 557                         stats->dot11RTSFailureCount++;
 558         }
 559
 560         /*
 561          * Send the tx_status to mac80211 & debugfs.
 562          * mac80211 will clean up the skb structure.
 563          */
 564         get_skb_desc(entry->skb)->frame_type = DUMP_FRAME_TXDONE;
 565         rt2x00debug_dump_frame(rt2x00dev, entry->skb);
 566         ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb, tx_status);
 567         entry->skb = NULL;
 568 }
 569 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 570
 571 void rt2x00lib_rxdone(struct data_entry *entry, struct sk_buff *skb,
 572                       struct rxdata_entry_desc *desc)
 573 {
 574         struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
 575         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 576         struct ieee80211_hw_mode *mode;
 577         struct ieee80211_rate *rate;
 578         struct ieee80211_hdr *hdr;
 579         unsigned int i;
 580         int val = 0;
 581         u16 fc;
 582
 583         /*
 584          * Update RX statistics.
 585          */
 586         mode = &rt2x00dev->hwmodes[rt2x00dev->curr_hwmode];
 587         for (i = 0; i < mode->num_rates; i++) {
 588                 rate = &mode->rates[i];
 589
 590                 /*
 591                  * When frame was received with an OFDM bitrate,
 592                  * the signal is the PLCP value. If it was received with
 593                  * a CCK bitrate the signal is the rate in 0.5kbit/s.
 594                  */
 595                 if (!desc->ofdm)
 596                         val = DEVICE_GET_RATE_FIELD(rate->val, RATE);
 597                 else
 598                         val = DEVICE_GET_RATE_FIELD(rate->val, PLCP);
 599
 600                 if (val == desc->signal) {
 601                         val = rate->val;
 602                         break;
 603                 }
 604         }
 605
 606         /*
 607          * Only update link status if this is a beacon frame carrying our bssid.
 608          */
 609         hdr = (struct ieee80211_hdr*)skb->data;
 610         fc = le16_to_cpu(hdr->frame_control);
 611         if (is_beacon(fc) && desc->my_bss)
 612                 rt2x00lib_update_link_stats(&rt2x00dev->link, desc->rssi);
 613
 614         rt2x00dev->link.qual.rx_success++;
 615
 616         rx_status->rate = val;
 617         rx_status->signal =
 618             rt2x00lib_calculate_link_signal(rt2x00dev, desc->rssi);
 619         rx_status->ssi = desc->rssi;
 620         rx_status->flag = desc->flags;
 621         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 622
 623         /*
 624          * Send frame to mac80211 & debugfs
 625          */
 626         get_skb_desc(skb)->frame_type = DUMP_FRAME_RXDONE;
 627         rt2x00debug_dump_frame(rt2x00dev, skb);
 628         ieee80211_rx_irqsafe(rt2x00dev->hw, skb, rx_status);
 629 }
 630 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 631
 632 /*
 633  * TX descriptor initializer
 634  */
 635 void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 636                              struct sk_buff *skb,
 637                              struct ieee80211_tx_control *control)
 638 {
 639         struct txdata_entry_desc desc;
 640         struct skb_desc *skbdesc = get_skb_desc(skb);
 641         struct ieee80211_hdr *ieee80211hdr = skbdesc->data;
 642         int tx_rate;
 643         int bitrate;
 644         int length;
 645         int duration;
 646         int residual;
 647         u16 frame_control;
 648         u16 seq_ctrl;
 649
 650         memset(&desc, 0, sizeof(desc));
 651
 652         desc.cw_min = skbdesc->ring->tx_params.cw_min;
 653         desc.cw_max = skbdesc->ring->tx_params.cw_max;
 654         desc.aifs = skbdesc->ring->tx_params.aifs;
 655
 656         /*
 657          * Identify queue
 658          */
 659         if (control->queue < rt2x00dev->hw->queues)
 660                 desc.queue = control->queue;
 661         else if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 662                  control->queue == IEEE80211_TX_QUEUE_AFTER_BEACON)
 663                 desc.queue = QUEUE_MGMT;
 664         else
 665                 desc.queue = QUEUE_OTHER;
 666
 667         /*
 668          * Read required fields from ieee80211 header.
 669          */
 670         frame_control = le16_to_cpu(ieee80211hdr->frame_control);
 671         seq_ctrl = le16_to_cpu(ieee80211hdr->seq_ctrl);
 672
 673         tx_rate = control->tx_rate;
 674
 675         /*
 676          * Check whether this frame is to be acked
 677          */
 678         if (!(control->flags & IEEE80211_TXCTL_NO_ACK))
 679                 __set_bit(ENTRY_TXD_ACK, &desc.flags);
 680
 681         /*
 682          * Check if this is a RTS/CTS frame
 683          */
 684         if (is_rts_frame(frame_control) || is_cts_frame(frame_control)) {
 685                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 686                 if (is_rts_frame(frame_control)) {
 687                         __set_bit(ENTRY_TXD_RTS_FRAME, &desc.flags);
 688                         __set_bit(ENTRY_TXD_ACK, &desc.flags);
 689                 } else
 690                         __clear_bit(ENTRY_TXD_ACK, &desc.flags);
 691                 if (control->rts_cts_rate)
 692                         tx_rate = control->rts_cts_rate;
 693         }
 694
 695         /*
 696          * Check for OFDM
 697          */
 698         if (DEVICE_GET_RATE_FIELD(tx_rate, RATEMASK) & DEV_OFDM_RATEMASK)
 699                 __set_bit(ENTRY_TXD_OFDM_RATE, &desc.flags);
 700
 701         /*
 702          * Check if more fragments are pending
 703          */
 704         if (ieee80211_get_morefrag(ieee80211hdr)) {
 705                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 706                 __set_bit(ENTRY_TXD_MORE_FRAG, &desc.flags);
 707         }
 708
 709         /*
 710          * Beacons and probe responses require the tsf timestamp
 711          * to be inserted into the frame.
 712          */
 713         if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 714             is_probe_resp(frame_control))
 715                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &desc.flags);
 716
 717         /*
 718          * Determine with what IFS priority this frame should be send.
 719          * Set ifs to IFS_SIFS when the this is not the first fragment,
 720          * or this fragment came after RTS/CTS.
 721          */
 722         if ((seq_ctrl & IEEE80211_SCTL_FRAG) > 0 ||
 723             test_bit(ENTRY_TXD_RTS_FRAME, &desc.flags))
 724                 desc.ifs = IFS_SIFS;
 725         else
 726                 desc.ifs = IFS_BACKOFF;
 727
 728         /*
 729          * PLCP setup
 730          * Length calculation depends on OFDM/CCK rate.
 731          */
 732         desc.signal = DEVICE_GET_RATE_FIELD(tx_rate, PLCP);
 733         desc.service = 0x04;
 734
 735         length = skbdesc->data_len + FCS_LEN;
 736         if (test_bit(ENTRY_TXD_OFDM_RATE, &desc.flags)) {
 737                 desc.length_high = (length >> 6) & 0x3f;
 738                 desc.length_low = length & 0x3f;
 739         } else {
 740                 bitrate = DEVICE_GET_RATE_FIELD(tx_rate, RATE);
 741
 742                 /*
 743                  * Convert length to microseconds.
 744                  */
 745                 residual = get_duration_res(length, bitrate);
 746                 duration = get_duration(length, bitrate);
 747
 748                 if (residual != 0) {
 749                         duration++;
 750
 751                         /*
 752                          * Check if we need to set the Length Extension
 753                          */
 754                         if (bitrate == 110 && residual <= 30)
 755                                 desc.service |= 0x80;
 756                 }
 757
 758                 desc.length_high = (duration >> 8) & 0xff;
 759                 desc.length_low = duration & 0xff;
 760
 761                 /*
 762                  * When preamble is enabled we should set the
 763                  * preamble bit for the signal.
 764                  */
 765                 if (DEVICE_GET_RATE_FIELD(tx_rate, PREAMBLE))
 766                         desc.signal |= 0x08;
 767         }
 768
 769         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, skb, &desc, control);
 770
 771         /*
 772          * Update ring entry.
 773          */
 774         skbdesc->entry->skb = skb;
 775         memcpy(&skbdesc->entry->tx_status.control, control, sizeof(*control));
 776
 777         /*
 778          * The frame has been completely initialized and ready
 779          * for sending to the device. The caller will push the
 780          * frame to the device, but we are going to push the
 781          * frame to debugfs here.
 782          */
 783         skbdesc->frame_type = DUMP_FRAME_TX;
 784         rt2x00debug_dump_frame(rt2x00dev, skb);
 785 }
 786 EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc);
 787
 788 /*
 789  * Driver initialization handlers.
 790  */
 791 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 792                               const int channel, const int tx_power,
 793                               const int value)
 794 {
 795         entry->chan = channel;
 796         if (channel <= 14)
 797                 entry->freq = 2407 + (5 * channel);
 798         else
 799                 entry->freq = 5000 + (5 * channel);
 800         entry->val = value;
 801         entry->flag =
 802             IEEE80211_CHAN_W_IBSS |
 803             IEEE80211_CHAN_W_ACTIVE_SCAN |
 804             IEEE80211_CHAN_W_SCAN;
 805         entry->power_level = tx_power;
 806         entry->antenna_max = 0xff;
 807 }
 808
 809 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 810                            const int rate, const int mask,
 811                            const int plcp, const int flags)
 812 {
 813         entry->rate = rate;
 814         entry->val =
 815             DEVICE_SET_RATE_FIELD(rate, RATE) |
 816             DEVICE_SET_RATE_FIELD(mask, RATEMASK) |
 817             DEVICE_SET_RATE_FIELD(plcp, PLCP);
 818         entry->flags = flags;
 819         entry->val2 = entry->val;
 820         if (entry->flags & IEEE80211_RATE_PREAMBLE2)
 821                 entry->val2 |= DEVICE_SET_RATE_FIELD(1, PREAMBLE);
 822         entry->min_rssi_ack = 0;
 823         entry->min_rssi_ack_delta = 0;
 824 }
 825
 826 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 827                                     struct hw_mode_spec *spec)
 828 {
 829         struct ieee80211_hw *hw = rt2x00dev->hw;
 830         struct ieee80211_hw_mode *hwmodes;
 831         struct ieee80211_channel *channels;
 832         struct ieee80211_rate *rates;
 833         unsigned int i;
 834         unsigned char tx_power;
 835
 836         hwmodes = kzalloc(sizeof(*hwmodes) * spec->num_modes, GFP_KERNEL);
 837         if (!hwmodes)
 838                 goto exit;
 839
 840         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 841         if (!channels)
 842                 goto exit_free_modes;
 843
 844         rates = kzalloc(sizeof(*rates) * spec->num_rates, GFP_KERNEL);
 845         if (!rates)
 846                 goto exit_free_channels;
 847
 848         /*
 849          * Initialize Rate list.
 850          */
 851         rt2x00lib_rate(&rates[0], 10, DEV_RATEMASK_1MB,
 852                        0x00, IEEE80211_RATE_CCK);
 853         rt2x00lib_rate(&rates[1], 20, DEV_RATEMASK_2MB,
 854                        0x01, IEEE80211_RATE_CCK_2);
 855         rt2x00lib_rate(&rates[2], 55, DEV_RATEMASK_5_5MB,
 856                        0x02, IEEE80211_RATE_CCK_2);
 857         rt2x00lib_rate(&rates[3], 110, DEV_RATEMASK_11MB,
 858                        0x03, IEEE80211_RATE_CCK_2);
 859
 860         if (spec->num_rates > 4) {
 861                 rt2x00lib_rate(&rates[4], 60, DEV_RATEMASK_6MB,
 862                                0x0b, IEEE80211_RATE_OFDM);
 863                 rt2x00lib_rate(&rates[5], 90, DEV_RATEMASK_9MB,
 864                                0x0f, IEEE80211_RATE_OFDM);
 865                 rt2x00lib_rate(&rates[6], 120, DEV_RATEMASK_12MB,
 866                                0x0a, IEEE80211_RATE_OFDM);
 867                 rt2x00lib_rate(&rates[7], 180, DEV_RATEMASK_18MB,
 868                                0x0e, IEEE80211_RATE_OFDM);
 869                 rt2x00lib_rate(&rates[8], 240, DEV_RATEMASK_24MB,
 870                                0x09, IEEE80211_RATE_OFDM);
 871                 rt2x00lib_rate(&rates[9], 360, DEV_RATEMASK_36MB,
 872                                0x0d, IEEE80211_RATE_OFDM);
 873                 rt2x00lib_rate(&rates[10], 480, DEV_RATEMASK_48MB,
 874                                0x08, IEEE80211_RATE_OFDM);
 875                 rt2x00lib_rate(&rates[11], 540, DEV_RATEMASK_54MB,
 876                                0x0c, IEEE80211_RATE_OFDM);
 877         }
 878
 879         /*
 880          * Initialize Channel list.
 881          */
 882         for (i = 0; i < spec->num_channels; i++) {
 883                 if (spec->channels[i].channel <= 14)
 884                         tx_power = spec->tx_power_bg[i];
 885                 else if (spec->tx_power_a)
 886                         tx_power = spec->tx_power_a[i];
 887                 else
 888                         tx_power = spec->tx_power_default;
 889
 890                 rt2x00lib_channel(&channels[i],
 891                                   spec->channels[i].channel, tx_power, i);
 892         }
 893
 894         /*
 895          * Intitialize 802.11b
 896          * Rates: CCK.
 897          * Channels: OFDM.
 898          */
 899         if (spec->num_modes > HWMODE_B) {
 900                 hwmodes[HWMODE_B].mode = MODE_IEEE80211B;
 901                 hwmodes[HWMODE_B].num_channels = 14;
 902                 hwmodes[HWMODE_B].num_rates = 4;
 903                 hwmodes[HWMODE_B].channels = channels;
 904                 hwmodes[HWMODE_B].rates = rates;
 905         }
 906
 907         /*
 908          * Intitialize 802.11g
 909          * Rates: CCK, OFDM.
 910          * Channels: OFDM.
 911          */
 912         if (spec->num_modes > HWMODE_G) {
 913                 hwmodes[HWMODE_G].mode = MODE_IEEE80211G;
 914                 hwmodes[HWMODE_G].num_channels = 14;
 915                 hwmodes[HWMODE_G].num_rates = spec->num_rates;
 916                 hwmodes[HWMODE_G].channels = channels;
 917                 hwmodes[HWMODE_G].rates = rates;
 918         }
 919
 920         /*
 921          * Intitialize 802.11a
 922          * Rates: OFDM.
 923          * Channels: OFDM, UNII, HiperLAN2.
 924          */
 925         if (spec->num_modes > HWMODE_A) {
 926                 hwmodes[HWMODE_A].mode = MODE_IEEE80211A;
 927                 hwmodes[HWMODE_A].num_channels = spec->num_channels - 14;
 928                 hwmodes[HWMODE_A].num_rates = spec->num_rates - 4;
 929                 hwmodes[HWMODE_A].channels = &channels[14];
 930                 hwmodes[HWMODE_A].rates = &rates[4];
 931         }
 932
 933         if (spec->num_modes > HWMODE_G &&
 934             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_G]))
 935                 goto exit_free_rates;
 936
 937         if (spec->num_modes > HWMODE_B &&
 938             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_B]))
 939                 goto exit_free_rates;
 940
 941         if (spec->num_modes > HWMODE_A &&
 942             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_A]))
 943                 goto exit_free_rates;
 944
 945         rt2x00dev->hwmodes = hwmodes;
 946
 947         return 0;
 948
 949 exit_free_rates:
 950         kfree(rates);
 951
 952 exit_free_channels:
 953         kfree(channels);
 954
 955 exit_free_modes:
 956         kfree(hwmodes);
 957
 958 exit:
 959         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 960         return -ENOMEM;
 961 }
 962
 963 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 964 {
 965         if (test_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags))
 966                 ieee80211_unregister_hw(rt2x00dev->hw);
 967
 968         if (likely(rt2x00dev->hwmodes)) {
 969                 kfree(rt2x00dev->hwmodes->channels);
 970                 kfree(rt2x00dev->hwmodes->rates);
 971                 kfree(rt2x00dev->hwmodes);
 972                 rt2x00dev->hwmodes = NULL;
 973         }
 974 }
 975
 976 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 977 {
 978         struct hw_mode_spec *spec = &rt2x00dev->spec;
 979         int status;
 980
 981         /*
 982          * Initialize HW modes.
 983          */
 984         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 985         if (status)
 986                 return status;
 987
 988         /*
 989          * Register HW.
 990          */
 991         status = ieee80211_register_hw(rt2x00dev->hw);
 992         if (status) {
 993                 rt2x00lib_remove_hw(rt2x00dev);
 994                 return status;
 995         }
 996
 997         __set_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags);
 998
 999         return 0;
1000 }
1001
1002 /*
1003  * Initialization/uninitialization handlers.
1004  */
1005 static int rt2x00lib_alloc_entries(struct data_ring *ring,
1006                                    const u16 max_entries, const u16 data_size,
1007                                    const u16 desc_size)
1008 {
1009         struct data_entry *entry;
1010         unsigned int i;
1011
1012         ring->stats.limit = max_entries;
1013         ring->data_size = data_size;
1014         ring->desc_size = desc_size;
1015
1016         /*
1017          * Allocate all ring entries.
1018          */
1019         entry = kzalloc(ring->stats.limit * sizeof(*entry), GFP_KERNEL);
1020         if (!entry)
1021                 return -ENOMEM;
1022
1023         for (i = 0; i < ring->stats.limit; i++) {
1024                 entry[i].flags = 0;
1025                 entry[i].ring = ring;
1026                 entry[i].skb = NULL;
1027                 entry[i].entry_idx = i;
1028         }
1029
1030         ring->entry = entry;
1031
1032         return 0;
1033 }
1034
1035 static int rt2x00lib_alloc_ring_entries(struct rt2x00_dev *rt2x00dev)
1036 {
1037         struct data_ring *ring;
1038
1039         /*
1040          * Allocate the RX ring.
1041          */
1042         if (rt2x00lib_alloc_entries(rt2x00dev->rx, RX_ENTRIES, DATA_FRAME_SIZE,
1043                                     rt2x00dev->ops->rxd_size))
1044                 return -ENOMEM;
1045
1046         /*
1047          * First allocate the TX rings.
1048          */
1049         txring_for_each(rt2x00dev, ring) {
1050                 if (rt2x00lib_alloc_entries(ring, TX_ENTRIES, DATA_FRAME_SIZE,
1051                                             rt2x00dev->ops->txd_size))
1052                         return -ENOMEM;
1053         }
1054
1055         if (!test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
1056                 return 0;
1057
1058         /*
1059          * Allocate the BEACON ring.
1060          */
1061         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[0], BEACON_ENTRIES,
1062                                     MGMT_FRAME_SIZE, rt2x00dev->ops->txd_size))
1063                 return -ENOMEM;
1064
1065         /*
1066          * Allocate the Atim ring.
1067          */
1068         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[1], ATIM_ENTRIES,
1069                                     DATA_FRAME_SIZE, rt2x00dev->ops->txd_size))
1070                 return -ENOMEM;
1071
1072         return 0;
1073 }
1074
1075 static void rt2x00lib_free_ring_entries(struct rt2x00_dev *rt2x00dev)
1076 {
1077         struct data_ring *ring;
1078
1079         ring_for_each(rt2x00dev, ring) {
1080                 kfree(ring->entry);
1081                 ring->entry = NULL;
1082         }
1083 }
1084
1085 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
1086 {
1087         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1088                 return;
1089
1090         /*
1091          * Unregister rfkill.
1092          */
1093         rt2x00rfkill_unregister(rt2x00dev);
1094
1095         /*
1096          * Allow the HW to uninitialize.
1097          */
1098         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1099
1100         /*
1101          * Free allocated ring entries.
1102          */
1103         rt2x00lib_free_ring_entries(rt2x00dev);
1104 }
1105
1106 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1107 {
1108         int status;
1109
1110         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1111                 return 0;
1112
1113         /*
1114          * Allocate all ring entries.
1115          */
1116         status = rt2x00lib_alloc_ring_entries(rt2x00dev);
1117         if (status) {
1118                 ERROR(rt2x00dev, "Ring entries allocation failed.\n");
1119                 return status;
1120         }
1121
1122         /*
1123          * Initialize the device.
1124          */
1125         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1126         if (status)
1127                 goto exit;
1128
1129         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
1130
1131         /*
1132          * Register the rfkill handler.
1133          */
1134         status = rt2x00rfkill_register(rt2x00dev);
1135         if (status)
1136                 goto exit_unitialize;
1137
1138         return 0;
1139
1140 exit_unitialize:
1141         rt2x00lib_uninitialize(rt2x00dev);
1142
1143 exit:
1144         rt2x00lib_free_ring_entries(rt2x00dev);
1145
1146         return status;
1147 }
1148
1149 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1150 {
1151         int retval;
1152
1153         if (test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1154                 return 0;
1155
1156         /*
1157          * If this is the first interface which is added,
1158          * we should load the firmware now.
1159          */
1160         if (test_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags)) {
1161                 retval = rt2x00lib_load_firmware(rt2x00dev);
1162                 if (retval)
1163                         return retval;
1164         }
1165
1166         /*
1167          * Initialize the device.
1168          */
1169         retval = rt2x00lib_initialize(rt2x00dev);
1170         if (retval)
1171                 return retval;
1172
1173         /*
1174          * Enable radio.
1175          */
1176         retval = rt2x00lib_enable_radio(rt2x00dev);
1177         if (retval) {
1178                 rt2x00lib_uninitialize(rt2x00dev);
1179                 return retval;
1180         }
1181
1182         __set_bit(DEVICE_STARTED, &rt2x00dev->flags);
1183
1184         return 0;
1185 }
1186
1187 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1188 {
1189         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1190                 return;
1191
1192         /*
1193          * Perhaps we can add something smarter here,
1194          * but for now just disabling the radio should do.
1195          */
1196         rt2x00lib_disable_radio(rt2x00dev);
1197
1198         __clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
1199 }
1200
1201 /*
1202  * driver allocation handlers.
1203  */
1204 static int rt2x00lib_alloc_rings(struct rt2x00_dev *rt2x00dev)
1205 {
1206         struct data_ring *ring;
1207         unsigned int index;
1208
1209         /*
1210          * We need the following rings:
1211          * RX: 1
1212          * TX: hw->queues
1213          * Beacon: 1 (if required)
1214          * Atim: 1 (if required)
1215          */
1216         rt2x00dev->data_rings = 1 + rt2x00dev->hw->queues +
1217             (2 * test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags));
1218
1219         ring = kzalloc(rt2x00dev->data_rings * sizeof(*ring), GFP_KERNEL);
1220         if (!ring) {
1221                 ERROR(rt2x00dev, "Ring allocation failed.\n");
1222                 return -ENOMEM;
1223         }
1224
1225         /*
1226          * Initialize pointers
1227          */
1228         rt2x00dev->rx = ring;
1229         rt2x00dev->tx = &rt2x00dev->rx[1];
1230         if (test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
1231                 rt2x00dev->bcn = &rt2x00dev->tx[rt2x00dev->hw->queues];
1232
1233         /*
1234          * Initialize ring parameters.
1235          * cw_min: 2^5 = 32.
1236          * cw_max: 2^10 = 1024.
1237          */
1238         index = 0;
1239         ring_for_each(rt2x00dev, ring) {
1240                 ring->rt2x00dev = rt2x00dev;
1241                 ring->queue_idx = index++;
1242                 ring->tx_params.aifs = 2;
1243                 ring->tx_params.cw_min = 5;
1244                 ring->tx_params.cw_max = 10;
1245         }
1246
1247         return 0;
1248 }
1249
1250 static void rt2x00lib_free_rings(struct rt2x00_dev *rt2x00dev)
1251 {
1252         kfree(rt2x00dev->rx);
1253         rt2x00dev->rx = NULL;
1254         rt2x00dev->tx = NULL;
1255         rt2x00dev->bcn = NULL;
1256 }
1257
1258 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1259 {
1260         int retval = -ENOMEM;
1261
1262         /*
1263          * Let the driver probe the device to detect the capabilities.
1264          */
1265         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1266         if (retval) {
1267                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1268                 goto exit;
1269         }
1270
1271         /*
1272          * Initialize configuration work.
1273          */
1274         INIT_WORK(&rt2x00dev->beacon_work, rt2x00lib_beacondone_scheduled);
1275         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
1276         INIT_WORK(&rt2x00dev->config_work, rt2x00lib_configuration_scheduled);
1277         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
1278
1279         /*
1280          * Reset current working type.
1281          */
1282         rt2x00dev->interface.type = IEEE80211_IF_TYPE_INVALID;
1283
1284         /*
1285          * Allocate ring array.
1286          */
1287         retval = rt2x00lib_alloc_rings(rt2x00dev);
1288         if (retval)
1289                 goto exit;
1290
1291         /*
1292          * Initialize ieee80211 structure.
1293          */
1294         retval = rt2x00lib_probe_hw(rt2x00dev);
1295         if (retval) {
1296                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1297                 goto exit;
1298         }
1299
1300         /*
1301          * Allocatie rfkill.
1302          */
1303         retval = rt2x00rfkill_allocate(rt2x00dev);
1304         if (retval)
1305                 goto exit;
1306
1307         /*
1308          * Open the debugfs entry.
1309          */
1310         rt2x00debug_register(rt2x00dev);
1311
1312         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1313
1314         return 0;
1315
1316 exit:
1317         rt2x00lib_remove_dev(rt2x00dev);
1318
1319         return retval;
1320 }
1321 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1322
1323 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1324 {
1325         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1326
1327         /*
1328          * Disable radio.
1329          */
1330         rt2x00lib_disable_radio(rt2x00dev);
1331
1332         /*
1333          * Uninitialize device.
1334          */
1335         rt2x00lib_uninitialize(rt2x00dev);
1336
1337         /*
1338          * Close debugfs entry.
1339          */
1340         rt2x00debug_deregister(rt2x00dev);
1341
1342         /*
1343          * Free rfkill
1344          */
1345         rt2x00rfkill_free(rt2x00dev);
1346
1347         /*
1348          * Free ieee80211_hw memory.
1349          */
1350         rt2x00lib_remove_hw(rt2x00dev);
1351
1352         /*
1353          * Free firmware image.
1354          */
1355         rt2x00lib_free_firmware(rt2x00dev);
1356
1357         /*
1358          * Free ring structures.
1359          */
1360         rt2x00lib_free_rings(rt2x00dev);
1361 }
1362 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1363
1364 /*
1365  * Device state handlers
1366  */
1367 #ifdef CONFIG_PM
1368 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1369 {
1370         int retval;
1371
1372         NOTICE(rt2x00dev, "Going to sleep.\n");
1373         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1374
1375         /*
1376          * Only continue if mac80211 has open interfaces.
1377          */
1378         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1379                 goto exit;
1380         __set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
1381
1382         /*
1383          * Disable radio and unitialize all items
1384          * that must be recreated on resume.
1385          */
1386         rt2x00lib_stop(rt2x00dev);
1387         rt2x00lib_uninitialize(rt2x00dev);
1388         rt2x00debug_deregister(rt2x00dev);
1389
1390 exit:
1391         /*
1392          * Set device mode to sleep for power management.
1393          */
1394         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1395         if (retval)
1396                 return retval;
1397
1398         return 0;
1399 }
1400 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1401
1402 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1403 {
1404         struct interface *intf = &rt2x00dev->interface;
1405         int retval;
1406
1407         NOTICE(rt2x00dev, "Waking up.\n");
1408
1409         /*
1410          * Open the debugfs entry.
1411          */
1412         rt2x00debug_register(rt2x00dev);
1413
1414         /*
1415          * Only continue if mac80211 had open interfaces.
1416          */
1417         if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
1418                 return 0;
1419
1420         /*
1421          * Reinitialize device and all active interfaces.
1422          */
1423         retval = rt2x00lib_start(rt2x00dev);
1424         if (retval)
1425                 goto exit;
1426
1427         /*
1428          * Reconfigure device.
1429          */
1430         rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
1431         if (!rt2x00dev->hw->conf.radio_enabled)
1432                 rt2x00lib_disable_radio(rt2x00dev);
1433
1434         rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
1435         rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
1436         rt2x00lib_config_type(rt2x00dev, intf->type);
1437
1438         /*
1439          * We are ready again to receive requests from mac80211.
1440          */
1441         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1442
1443         /*
1444          * It is possible that during that mac80211 has attempted
1445          * to send frames while we were suspending or resuming.
1446          * In that case we have disabled the TX queue and should
1447          * now enable it again
1448          */
1449         ieee80211_start_queues(rt2x00dev->hw);
1450
1451         /*
1452          * When in Master or Ad-hoc mode,
1453          * restart Beacon transmitting by faking a beacondone event.
1454          */
1455         if (intf->type == IEEE80211_IF_TYPE_AP ||
1456             intf->type == IEEE80211_IF_TYPE_IBSS)
1457                 rt2x00lib_beacondone(rt2x00dev);
1458
1459         return 0;
1460
1461 exit:
1462         rt2x00lib_disable_radio(rt2x00dev);
1463         rt2x00lib_uninitialize(rt2x00dev);
1464         rt2x00debug_deregister(rt2x00dev);
1465
1466         return retval;
1467 }
1468 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1469 #endif /* CONFIG_PM */
1470
1471 /*
1472  * rt2x00lib module information.
1473  */
1474 MODULE_AUTHOR(DRV_PROJECT);
1475 MODULE_VERSION(DRV_VERSION);
1476 MODULE_DESCRIPTION("rt2x00 library");
1477 MODULE_LICENSE("GPL");