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 ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 530         struct ieee80211_hw_mode *mode;
 531         struct ieee80211_rate *rate;
 532         struct ieee80211_hdr *hdr;
 533         unsigned int i;
 534         int val = 0;
 535         u16 fc;
 536
 537         /*
 538          * Update RX statistics.
 539          */
 540         mode = &rt2x00dev->hwmodes[rt2x00dev->curr_hwmode];
 541         for (i = 0; i < mode->num_rates; i++) {
 542                 rate = &mode->rates[i];
 543
 544                 /*
 545                  * When frame was received with an OFDM bitrate,
 546                  * the signal is the PLCP value. If it was received with
 547                  * a CCK bitrate the signal is the rate in 0.5kbit/s.
 548                  */
 549                 if (!desc->ofdm)
 550                         val = DEVICE_GET_RATE_FIELD(rate->val, RATE);
 551                 else
 552                         val = DEVICE_GET_RATE_FIELD(rate->val, PLCP);
 553
 554                 if (val == desc->signal) {
 555                         val = rate->val;
 556                         break;
 557                 }
 558         }
 559
 560         /*
 561          * Only update link status if this is a beacon frame carrying our bssid.
 562          */
 563         hdr = (struct ieee80211_hdr*)skb->data;
 564         fc = le16_to_cpu(hdr->frame_control);
 565         if (is_beacon(fc) && desc->my_bss)
 566                 rt2x00lib_update_link_stats(&rt2x00dev->link, desc->rssi);
 567
 568         rt2x00dev->link.qual.rx_success++;
 569
 570         rx_status->rate = val;
 571         rx_status->signal =
 572             rt2x00lib_calculate_link_signal(rt2x00dev, desc->rssi);
 573         rx_status->ssi = desc->rssi;
 574         rx_status->flag = desc->flags;
 575         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 576
 577         /*
 578          * Send frame to mac80211 & debugfs
 579          */
 580         get_skb_desc(skb)->frame_type = DUMP_FRAME_RXDONE;
 581         rt2x00debug_dump_frame(rt2x00dev, skb);
 582         ieee80211_rx_irqsafe(rt2x00dev->hw, skb, rx_status);
 583 }
 584 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 585
 586 /*
 587  * TX descriptor initializer
 588  */
 589 void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 590                              struct sk_buff *skb,
 591                              struct ieee80211_tx_control *control)
 592 {
 593         struct txdata_entry_desc desc;
 594         struct skb_desc *skbdesc = get_skb_desc(skb);
 595         struct ieee80211_hdr *ieee80211hdr = skbdesc->data;
 596         int tx_rate;
 597         int bitrate;
 598         int length;
 599         int duration;
 600         int residual;
 601         u16 frame_control;
 602         u16 seq_ctrl;
 603
 604         memset(&desc, 0, sizeof(desc));
 605
 606         desc.cw_min = skbdesc->ring->tx_params.cw_min;
 607         desc.cw_max = skbdesc->ring->tx_params.cw_max;
 608         desc.aifs = skbdesc->ring->tx_params.aifs;
 609
 610         /*
 611          * Identify queue
 612          */
 613         if (control->queue < rt2x00dev->hw->queues)
 614                 desc.queue = control->queue;
 615         else if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 616                  control->queue == IEEE80211_TX_QUEUE_AFTER_BEACON)
 617                 desc.queue = QUEUE_MGMT;
 618         else
 619                 desc.queue = QUEUE_OTHER;
 620
 621         /*
 622          * Read required fields from ieee80211 header.
 623          */
 624         frame_control = le16_to_cpu(ieee80211hdr->frame_control);
 625         seq_ctrl = le16_to_cpu(ieee80211hdr->seq_ctrl);
 626
 627         tx_rate = control->tx_rate;
 628
 629         /*
 630          * Check whether this frame is to be acked
 631          */
 632         if (!(control->flags & IEEE80211_TXCTL_NO_ACK))
 633                 __set_bit(ENTRY_TXD_ACK, &desc.flags);
 634
 635         /*
 636          * Check if this is a RTS/CTS frame
 637          */
 638         if (is_rts_frame(frame_control) || is_cts_frame(frame_control)) {
 639                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 640                 if (is_rts_frame(frame_control)) {
 641                         __set_bit(ENTRY_TXD_RTS_FRAME, &desc.flags);
 642                         __set_bit(ENTRY_TXD_ACK, &desc.flags);
 643                 } else
 644                         __clear_bit(ENTRY_TXD_ACK, &desc.flags);
 645                 if (control->rts_cts_rate)
 646                         tx_rate = control->rts_cts_rate;
 647         }
 648
 649         /*
 650          * Check for OFDM
 651          */
 652         if (DEVICE_GET_RATE_FIELD(tx_rate, RATEMASK) & DEV_OFDM_RATEMASK)
 653                 __set_bit(ENTRY_TXD_OFDM_RATE, &desc.flags);
 654
 655         /*
 656          * Check if more fragments are pending
 657          */
 658         if (ieee80211_get_morefrag(ieee80211hdr)) {
 659                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 660                 __set_bit(ENTRY_TXD_MORE_FRAG, &desc.flags);
 661         }
 662
 663         /*
 664          * Beacons and probe responses require the tsf timestamp
 665          * to be inserted into the frame.
 666          */
 667         if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 668             is_probe_resp(frame_control))
 669                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &desc.flags);
 670
 671         /*
 672          * Determine with what IFS priority this frame should be send.
 673          * Set ifs to IFS_SIFS when the this is not the first fragment,
 674          * or this fragment came after RTS/CTS.
 675          */
 676         if ((seq_ctrl & IEEE80211_SCTL_FRAG) > 0 ||
 677             test_bit(ENTRY_TXD_RTS_FRAME, &desc.flags))
 678                 desc.ifs = IFS_SIFS;
 679         else
 680                 desc.ifs = IFS_BACKOFF;
 681
 682         /*
 683          * PLCP setup
 684          * Length calculation depends on OFDM/CCK rate.
 685          */
 686         desc.signal = DEVICE_GET_RATE_FIELD(tx_rate, PLCP);
 687         desc.service = 0x04;
 688
 689         length = skbdesc->data_len + FCS_LEN;
 690         if (test_bit(ENTRY_TXD_OFDM_RATE, &desc.flags)) {
 691                 desc.length_high = (length >> 6) & 0x3f;
 692                 desc.length_low = length & 0x3f;
 693         } else {
 694                 bitrate = DEVICE_GET_RATE_FIELD(tx_rate, RATE);
 695
 696                 /*
 697                  * Convert length to microseconds.
 698                  */
 699                 residual = get_duration_res(length, bitrate);
 700                 duration = get_duration(length, bitrate);
 701
 702                 if (residual != 0) {
 703                         duration++;
 704
 705                         /*
 706                          * Check if we need to set the Length Extension
 707                          */
 708                         if (bitrate == 110 && residual <= 30)
 709                                 desc.service |= 0x80;
 710                 }
 711
 712                 desc.length_high = (duration >> 8) & 0xff;
 713                 desc.length_low = duration & 0xff;
 714
 715                 /*
 716                  * When preamble is enabled we should set the
 717                  * preamble bit for the signal.
 718                  */
 719                 if (DEVICE_GET_RATE_FIELD(tx_rate, PREAMBLE))
 720                         desc.signal |= 0x08;
 721         }
 722
 723         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, skb, &desc, control);
 724
 725         /*
 726          * Update ring entry.
 727          */
 728         skbdesc->entry->skb = skb;
 729         memcpy(&skbdesc->entry->tx_status.control, control, sizeof(*control));
 730
 731         /*
 732          * The frame has been completely initialized and ready
 733          * for sending to the device. The caller will push the
 734          * frame to the device, but we are going to push the
 735          * frame to debugfs here.
 736          */
 737         skbdesc->frame_type = DUMP_FRAME_TX;
 738         rt2x00debug_dump_frame(rt2x00dev, skb);
 739 }
 740 EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc);
 741
 742 /*
 743  * Driver initialization handlers.
 744  */
 745 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 746                               const int channel, const int tx_power,
 747                               const int value)
 748 {
 749         entry->chan = channel;
 750         if (channel <= 14)
 751                 entry->freq = 2407 + (5 * channel);
 752         else
 753                 entry->freq = 5000 + (5 * channel);
 754         entry->val = value;
 755         entry->flag =
 756             IEEE80211_CHAN_W_IBSS |
 757             IEEE80211_CHAN_W_ACTIVE_SCAN |
 758             IEEE80211_CHAN_W_SCAN;
 759         entry->power_level = tx_power;
 760         entry->antenna_max = 0xff;
 761 }
 762
 763 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 764                            const int rate, const int mask,
 765                            const int plcp, const int flags)
 766 {
 767         entry->rate = rate;
 768         entry->val =
 769             DEVICE_SET_RATE_FIELD(rate, RATE) |
 770             DEVICE_SET_RATE_FIELD(mask, RATEMASK) |
 771             DEVICE_SET_RATE_FIELD(plcp, PLCP);
 772         entry->flags = flags;
 773         entry->val2 = entry->val;
 774         if (entry->flags & IEEE80211_RATE_PREAMBLE2)
 775                 entry->val2 |= DEVICE_SET_RATE_FIELD(1, PREAMBLE);
 776         entry->min_rssi_ack = 0;
 777         entry->min_rssi_ack_delta = 0;
 778 }
 779
 780 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 781                                     struct hw_mode_spec *spec)
 782 {
 783         struct ieee80211_hw *hw = rt2x00dev->hw;
 784         struct ieee80211_hw_mode *hwmodes;
 785         struct ieee80211_channel *channels;
 786         struct ieee80211_rate *rates;
 787         unsigned int i;
 788         unsigned char tx_power;
 789
 790         hwmodes = kzalloc(sizeof(*hwmodes) * spec->num_modes, GFP_KERNEL);
 791         if (!hwmodes)
 792                 goto exit;
 793
 794         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 795         if (!channels)
 796                 goto exit_free_modes;
 797
 798         rates = kzalloc(sizeof(*rates) * spec->num_rates, GFP_KERNEL);
 799         if (!rates)
 800                 goto exit_free_channels;
 801
 802         /*
 803          * Initialize Rate list.
 804          */
 805         rt2x00lib_rate(&rates[0], 10, DEV_RATEMASK_1MB,
 806                        0x00, IEEE80211_RATE_CCK);
 807         rt2x00lib_rate(&rates[1], 20, DEV_RATEMASK_2MB,
 808                        0x01, IEEE80211_RATE_CCK_2);
 809         rt2x00lib_rate(&rates[2], 55, DEV_RATEMASK_5_5MB,
 810                        0x02, IEEE80211_RATE_CCK_2);
 811         rt2x00lib_rate(&rates[3], 110, DEV_RATEMASK_11MB,
 812                        0x03, IEEE80211_RATE_CCK_2);
 813
 814         if (spec->num_rates > 4) {
 815                 rt2x00lib_rate(&rates[4], 60, DEV_RATEMASK_6MB,
 816                                0x0b, IEEE80211_RATE_OFDM);
 817                 rt2x00lib_rate(&rates[5], 90, DEV_RATEMASK_9MB,
 818                                0x0f, IEEE80211_RATE_OFDM);
 819                 rt2x00lib_rate(&rates[6], 120, DEV_RATEMASK_12MB,
 820                                0x0a, IEEE80211_RATE_OFDM);
 821                 rt2x00lib_rate(&rates[7], 180, DEV_RATEMASK_18MB,
 822                                0x0e, IEEE80211_RATE_OFDM);
 823                 rt2x00lib_rate(&rates[8], 240, DEV_RATEMASK_24MB,
 824                                0x09, IEEE80211_RATE_OFDM);
 825                 rt2x00lib_rate(&rates[9], 360, DEV_RATEMASK_36MB,
 826                                0x0d, IEEE80211_RATE_OFDM);
 827                 rt2x00lib_rate(&rates[10], 480, DEV_RATEMASK_48MB,
 828                                0x08, IEEE80211_RATE_OFDM);
 829                 rt2x00lib_rate(&rates[11], 540, DEV_RATEMASK_54MB,
 830                                0x0c, IEEE80211_RATE_OFDM);
 831         }
 832
 833         /*
 834          * Initialize Channel list.
 835          */
 836         for (i = 0; i < spec->num_channels; i++) {
 837                 if (spec->channels[i].channel <= 14)
 838                         tx_power = spec->tx_power_bg[i];
 839                 else if (spec->tx_power_a)
 840                         tx_power = spec->tx_power_a[i];
 841                 else
 842                         tx_power = spec->tx_power_default;
 843
 844                 rt2x00lib_channel(&channels[i],
 845                                   spec->channels[i].channel, tx_power, i);
 846         }
 847
 848         /*
 849          * Intitialize 802.11b
 850          * Rates: CCK.
 851          * Channels: OFDM.
 852          */
 853         if (spec->num_modes > HWMODE_B) {
 854                 hwmodes[HWMODE_B].mode = MODE_IEEE80211B;
 855                 hwmodes[HWMODE_B].num_channels = 14;
 856                 hwmodes[HWMODE_B].num_rates = 4;
 857                 hwmodes[HWMODE_B].channels = channels;
 858                 hwmodes[HWMODE_B].rates = rates;
 859         }
 860
 861         /*
 862          * Intitialize 802.11g
 863          * Rates: CCK, OFDM.
 864          * Channels: OFDM.
 865          */
 866         if (spec->num_modes > HWMODE_G) {
 867                 hwmodes[HWMODE_G].mode = MODE_IEEE80211G;
 868                 hwmodes[HWMODE_G].num_channels = 14;
 869                 hwmodes[HWMODE_G].num_rates = spec->num_rates;
 870                 hwmodes[HWMODE_G].channels = channels;
 871                 hwmodes[HWMODE_G].rates = rates;
 872         }
 873
 874         /*
 875          * Intitialize 802.11a
 876          * Rates: OFDM.
 877          * Channels: OFDM, UNII, HiperLAN2.
 878          */
 879         if (spec->num_modes > HWMODE_A) {
 880                 hwmodes[HWMODE_A].mode = MODE_IEEE80211A;
 881                 hwmodes[HWMODE_A].num_channels = spec->num_channels - 14;
 882                 hwmodes[HWMODE_A].num_rates = spec->num_rates - 4;
 883                 hwmodes[HWMODE_A].channels = &channels[14];
 884                 hwmodes[HWMODE_A].rates = &rates[4];
 885         }
 886
 887         if (spec->num_modes > HWMODE_G &&
 888             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_G]))
 889                 goto exit_free_rates;
 890
 891         if (spec->num_modes > HWMODE_B &&
 892             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_B]))
 893                 goto exit_free_rates;
 894
 895         if (spec->num_modes > HWMODE_A &&
 896             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_A]))
 897                 goto exit_free_rates;
 898
 899         rt2x00dev->hwmodes = hwmodes;
 900
 901         return 0;
 902
 903 exit_free_rates:
 904         kfree(rates);
 905
 906 exit_free_channels:
 907         kfree(channels);
 908
 909 exit_free_modes:
 910         kfree(hwmodes);
 911
 912 exit:
 913         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 914         return -ENOMEM;
 915 }
 916
 917 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 918 {
 919         if (test_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags))
 920                 ieee80211_unregister_hw(rt2x00dev->hw);
 921
 922         if (likely(rt2x00dev->hwmodes)) {
 923                 kfree(rt2x00dev->hwmodes->channels);
 924                 kfree(rt2x00dev->hwmodes->rates);
 925                 kfree(rt2x00dev->hwmodes);
 926                 rt2x00dev->hwmodes = NULL;
 927         }
 928 }
 929
 930 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 931 {
 932         struct hw_mode_spec *spec = &rt2x00dev->spec;
 933         int status;
 934
 935         /*
 936          * Initialize HW modes.
 937          */
 938         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 939         if (status)
 940                 return status;
 941
 942         /*
 943          * Register HW.
 944          */
 945         status = ieee80211_register_hw(rt2x00dev->hw);
 946         if (status) {
 947                 rt2x00lib_remove_hw(rt2x00dev);
 948                 return status;
 949         }
 950
 951         __set_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags);
 952
 953         return 0;
 954 }
 955
 956 /*
 957  * Initialization/uninitialization handlers.
 958  */
 959 static int rt2x00lib_alloc_entries(struct data_ring *ring,
 960                                    const u16 max_entries, const u16 data_size,
 961                                    const u16 desc_size)
 962 {
 963         struct data_entry *entry;
 964         unsigned int i;
 965
 966         ring->stats.limit = max_entries;
 967         ring->data_size = data_size;
 968         ring->desc_size = desc_size;
 969
 970         /*
 971          * Allocate all ring entries.
 972          */
 973         entry = kzalloc(ring->stats.limit * sizeof(*entry), GFP_KERNEL);
 974         if (!entry)
 975                 return -ENOMEM;
 976
 977         for (i = 0; i < ring->stats.limit; i++) {
 978                 entry[i].flags = 0;
 979                 entry[i].ring = ring;
 980                 entry[i].skb = NULL;
 981                 entry[i].entry_idx = i;
 982         }
 983
 984         ring->entry = entry;
 985
 986         return 0;
 987 }
 988
 989 static int rt2x00lib_alloc_ring_entries(struct rt2x00_dev *rt2x00dev)
 990 {
 991         struct data_ring *ring;
 992
 993         /*
 994          * Allocate the RX ring.
 995          */
 996         if (rt2x00lib_alloc_entries(rt2x00dev->rx, RX_ENTRIES, DATA_FRAME_SIZE,
 997                                     rt2x00dev->ops->rxd_size))
 998                 return -ENOMEM;
 999
1000         /*
1001          * First allocate the TX rings.
1002          */
1003         txring_for_each(rt2x00dev, ring) {
1004                 if (rt2x00lib_alloc_entries(ring, TX_ENTRIES, DATA_FRAME_SIZE,
1005                                             rt2x00dev->ops->txd_size))
1006                         return -ENOMEM;
1007         }
1008
1009         if (!test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
1010                 return 0;
1011
1012         /*
1013          * Allocate the BEACON ring.
1014          */
1015         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[0], BEACON_ENTRIES,
1016                                     MGMT_FRAME_SIZE, rt2x00dev->ops->txd_size))
1017                 return -ENOMEM;
1018
1019         /*
1020          * Allocate the Atim ring.
1021          */
1022         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[1], ATIM_ENTRIES,
1023                                     DATA_FRAME_SIZE, rt2x00dev->ops->txd_size))
1024                 return -ENOMEM;
1025
1026         return 0;
1027 }
1028
1029 static void rt2x00lib_free_ring_entries(struct rt2x00_dev *rt2x00dev)
1030 {
1031         struct data_ring *ring;
1032
1033         ring_for_each(rt2x00dev, ring) {
1034                 kfree(ring->entry);
1035                 ring->entry = NULL;
1036         }
1037 }
1038
1039 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
1040 {
1041         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1042                 return;
1043
1044         /*
1045          * Unregister rfkill.
1046          */
1047         rt2x00rfkill_unregister(rt2x00dev);
1048
1049         /*
1050          * Allow the HW to uninitialize.
1051          */
1052         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1053
1054         /*
1055          * Free allocated ring entries.
1056          */
1057         rt2x00lib_free_ring_entries(rt2x00dev);
1058 }
1059
1060 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1061 {
1062         int status;
1063
1064         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1065                 return 0;
1066
1067         /*
1068          * Allocate all ring entries.
1069          */
1070         status = rt2x00lib_alloc_ring_entries(rt2x00dev);
1071         if (status) {
1072                 ERROR(rt2x00dev, "Ring entries allocation failed.\n");
1073                 return status;
1074         }
1075
1076         /*
1077          * Initialize the device.
1078          */
1079         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1080         if (status)
1081                 goto exit;
1082
1083         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
1084
1085         /*
1086          * Register the rfkill handler.
1087          */
1088         status = rt2x00rfkill_register(rt2x00dev);
1089         if (status)
1090                 goto exit_unitialize;
1091
1092         return 0;
1093
1094 exit_unitialize:
1095         rt2x00lib_uninitialize(rt2x00dev);
1096
1097 exit:
1098         rt2x00lib_free_ring_entries(rt2x00dev);
1099
1100         return status;
1101 }
1102
1103 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1104 {
1105         int retval;
1106
1107         if (test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1108                 return 0;
1109
1110         /*
1111          * If this is the first interface which is added,
1112          * we should load the firmware now.
1113          */
1114         if (test_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags)) {
1115                 retval = rt2x00lib_load_firmware(rt2x00dev);
1116                 if (retval)
1117                         return retval;
1118         }
1119
1120         /*
1121          * Initialize the device.
1122          */
1123         retval = rt2x00lib_initialize(rt2x00dev);
1124         if (retval)
1125                 return retval;
1126
1127         /*
1128          * Enable radio.
1129          */
1130         retval = rt2x00lib_enable_radio(rt2x00dev);
1131         if (retval) {
1132                 rt2x00lib_uninitialize(rt2x00dev);
1133                 return retval;
1134         }
1135
1136         __set_bit(DEVICE_STARTED, &rt2x00dev->flags);
1137
1138         return 0;
1139 }
1140
1141 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1142 {
1143         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1144                 return;
1145
1146         /*
1147          * Perhaps we can add something smarter here,
1148          * but for now just disabling the radio should do.
1149          */
1150         rt2x00lib_disable_radio(rt2x00dev);
1151
1152         __clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
1153 }
1154
1155 /*
1156  * driver allocation handlers.
1157  */
1158 static int rt2x00lib_alloc_rings(struct rt2x00_dev *rt2x00dev)
1159 {
1160         struct data_ring *ring;
1161         unsigned int index;
1162
1163         /*
1164          * We need the following rings:
1165          * RX: 1
1166          * TX: hw->queues
1167          * Beacon: 1 (if required)
1168          * Atim: 1 (if required)
1169          */
1170         rt2x00dev->data_rings = 1 + rt2x00dev->hw->queues +
1171             (2 * test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags));
1172
1173         ring = kzalloc(rt2x00dev->data_rings * sizeof(*ring), GFP_KERNEL);
1174         if (!ring) {
1175                 ERROR(rt2x00dev, "Ring allocation failed.\n");
1176                 return -ENOMEM;
1177         }
1178
1179         /*
1180          * Initialize pointers
1181          */
1182         rt2x00dev->rx = ring;
1183         rt2x00dev->tx = &rt2x00dev->rx[1];
1184         if (test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
1185                 rt2x00dev->bcn = &rt2x00dev->tx[rt2x00dev->hw->queues];
1186
1187         /*
1188          * Initialize ring parameters.
1189          * cw_min: 2^5 = 32.
1190          * cw_max: 2^10 = 1024.
1191          */
1192         index = 0;
1193         ring_for_each(rt2x00dev, ring) {
1194                 ring->rt2x00dev = rt2x00dev;
1195                 ring->queue_idx = index++;
1196                 ring->tx_params.aifs = 2;
1197                 ring->tx_params.cw_min = 5;
1198                 ring->tx_params.cw_max = 10;
1199         }
1200
1201         return 0;
1202 }
1203
1204 static void rt2x00lib_free_rings(struct rt2x00_dev *rt2x00dev)
1205 {
1206         kfree(rt2x00dev->rx);
1207         rt2x00dev->rx = NULL;
1208         rt2x00dev->tx = NULL;
1209         rt2x00dev->bcn = NULL;
1210 }
1211
1212 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1213 {
1214         int retval = -ENOMEM;
1215
1216         /*
1217          * Let the driver probe the device to detect the capabilities.
1218          */
1219         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1220         if (retval) {
1221                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1222                 goto exit;
1223         }
1224
1225         /*
1226          * Initialize configuration work.
1227          */
1228         INIT_WORK(&rt2x00dev->beacon_work, rt2x00lib_beacondone_scheduled);
1229         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
1230         INIT_WORK(&rt2x00dev->config_work, rt2x00lib_configuration_scheduled);
1231         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
1232
1233         /*
1234          * Reset current working type.
1235          */
1236         rt2x00dev->interface.type = IEEE80211_IF_TYPE_INVALID;
1237
1238         /*
1239          * Allocate ring array.
1240          */
1241         retval = rt2x00lib_alloc_rings(rt2x00dev);
1242         if (retval)
1243                 goto exit;
1244
1245         /*
1246          * Initialize ieee80211 structure.
1247          */
1248         retval = rt2x00lib_probe_hw(rt2x00dev);
1249         if (retval) {
1250                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1251                 goto exit;
1252         }
1253
1254         /*
1255          * Allocatie rfkill.
1256          */
1257         retval = rt2x00rfkill_allocate(rt2x00dev);
1258         if (retval)
1259                 goto exit;
1260
1261         /*
1262          * Open the debugfs entry.
1263          */
1264         rt2x00debug_register(rt2x00dev);
1265
1266         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1267
1268         return 0;
1269
1270 exit:
1271         rt2x00lib_remove_dev(rt2x00dev);
1272
1273         return retval;
1274 }
1275 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1276
1277 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1278 {
1279         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1280
1281         /*
1282          * Disable radio.
1283          */
1284         rt2x00lib_disable_radio(rt2x00dev);
1285
1286         /*
1287          * Uninitialize device.
1288          */
1289         rt2x00lib_uninitialize(rt2x00dev);
1290
1291         /*
1292          * Close debugfs entry.
1293          */
1294         rt2x00debug_deregister(rt2x00dev);
1295
1296         /*
1297          * Free rfkill
1298          */
1299         rt2x00rfkill_free(rt2x00dev);
1300
1301         /*
1302          * Free ieee80211_hw memory.
1303          */
1304         rt2x00lib_remove_hw(rt2x00dev);
1305
1306         /*
1307          * Free firmware image.
1308          */
1309         rt2x00lib_free_firmware(rt2x00dev);
1310
1311         /*
1312          * Free ring structures.
1313          */
1314         rt2x00lib_free_rings(rt2x00dev);
1315 }
1316 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1317
1318 /*
1319  * Device state handlers
1320  */
1321 #ifdef CONFIG_PM
1322 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1323 {
1324         int retval;
1325
1326         NOTICE(rt2x00dev, "Going to sleep.\n");
1327         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1328
1329         /*
1330          * Only continue if mac80211 has open interfaces.
1331          */
1332         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1333                 goto exit;
1334         __set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
1335
1336         /*
1337          * Disable radio and unitialize all items
1338          * that must be recreated on resume.
1339          */
1340         rt2x00lib_stop(rt2x00dev);
1341         rt2x00lib_uninitialize(rt2x00dev);
1342         rt2x00debug_deregister(rt2x00dev);
1343
1344 exit:
1345         /*
1346          * Set device mode to sleep for power management.
1347          */
1348         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1349         if (retval)
1350                 return retval;
1351
1352         return 0;
1353 }
1354 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1355
1356 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1357 {
1358         struct interface *intf = &rt2x00dev->interface;
1359         int retval;
1360
1361         NOTICE(rt2x00dev, "Waking up.\n");
1362
1363         /*
1364          * Open the debugfs entry.
1365          */
1366         rt2x00debug_register(rt2x00dev);
1367
1368         /*
1369          * Only continue if mac80211 had open interfaces.
1370          */
1371         if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
1372                 return 0;
1373
1374         /*
1375          * Reinitialize device and all active interfaces.
1376          */
1377         retval = rt2x00lib_start(rt2x00dev);
1378         if (retval)
1379                 goto exit;
1380
1381         /*
1382          * Reconfigure device.
1383          */
1384         rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
1385         if (!rt2x00dev->hw->conf.radio_enabled)
1386                 rt2x00lib_disable_radio(rt2x00dev);
1387
1388         rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
1389         rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
1390         rt2x00lib_config_type(rt2x00dev, intf->type);
1391
1392         /*
1393          * We are ready again to receive requests from mac80211.
1394          */
1395         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1396
1397         /*
1398          * It is possible that during that mac80211 has attempted
1399          * to send frames while we were suspending or resuming.
1400          * In that case we have disabled the TX queue and should
1401          * now enable it again
1402          */
1403         ieee80211_start_queues(rt2x00dev->hw);
1404
1405         /*
1406          * When in Master or Ad-hoc mode,
1407          * restart Beacon transmitting by faking a beacondone event.
1408          */
1409         if (intf->type == IEEE80211_IF_TYPE_AP ||
1410             intf->type == IEEE80211_IF_TYPE_IBSS)
1411                 rt2x00lib_beacondone(rt2x00dev);
1412
1413         return 0;
1414
1415 exit:
1416         rt2x00lib_disable_radio(rt2x00dev);
1417         rt2x00lib_uninitialize(rt2x00dev);
1418         rt2x00debug_deregister(rt2x00dev);
1419
1420         return retval;
1421 }
1422 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1423 #endif /* CONFIG_PM */
1424
1425 /*
1426  * rt2x00lib module information.
1427  */
1428 MODULE_AUTHOR(DRV_PROJECT);
1429 MODULE_VERSION(DRV_VERSION);
1430 MODULE_DESCRIPTION("rt2x00 library");
1431 MODULE_LICENSE("GPL");