SAFE public projects git trees. - safe/jmp/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  * 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->interface.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->interface.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         unsigned int i;
 533         int val = 0;
 534
 535         /*
 536          * Update RX statistics.
 537          */
 538         mode = &rt2x00dev->hwmodes[rt2x00dev->curr_hwmode];
 539         for (i = 0; i < mode->num_rates; i++) {
 540                 rate = &mode->rates[i];
 541
 542                 /*
 543                  * When frame was received with an OFDM bitrate,
 544                  * the signal is the PLCP value. If it was received with
 545                  * a CCK bitrate the signal is the rate in 0.5kbit/s.
 546                  */
 547                 if (!desc->ofdm)
 548                         val = DEVICE_GET_RATE_FIELD(rate->val, RATE);
 549                 else
 550                         val = DEVICE_GET_RATE_FIELD(rate->val, PLCP);
 551
 552                 if (val == desc->signal) {
 553                         val = rate->val;
 554                         break;
 555                 }
 556         }
 557
 558         rt2x00lib_update_link_stats(&rt2x00dev->link, desc->rssi);
 559         rt2x00dev->link.qual.rx_success++;
 560
 561         rx_status->rate = val;
 562         rx_status->signal =
 563             rt2x00lib_calculate_link_signal(rt2x00dev, desc->rssi);
 564         rx_status->ssi = desc->rssi;
 565         rx_status->flag = desc->flags;
 566         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 567
 568         /*
 569          * Send frame to mac80211 & debugfs
 570          */
 571         get_skb_desc(skb)->frame_type = DUMP_FRAME_RXDONE;
 572         rt2x00debug_dump_frame(rt2x00dev, skb);
 573         ieee80211_rx_irqsafe(rt2x00dev->hw, skb, rx_status);
 574 }
 575 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 576
 577 /*
 578  * TX descriptor initializer
 579  */
 580 void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 581                              struct sk_buff *skb,
 582                              struct ieee80211_tx_control *control)
 583 {
 584         struct txdata_entry_desc desc;
 585         struct skb_desc *skbdesc = get_skb_desc(skb);
 586         struct ieee80211_hdr *ieee80211hdr = skbdesc->data;
 587         __le32 *txd = skbdesc->desc;
 588         int tx_rate;
 589         int bitrate;
 590         int length;
 591         int duration;
 592         int residual;
 593         u16 frame_control;
 594         u16 seq_ctrl;
 595
 596         memset(&desc, 0, sizeof(desc));
 597
 598         desc.cw_min = skbdesc->ring->tx_params.cw_min;
 599         desc.cw_max = skbdesc->ring->tx_params.cw_max;
 600         desc.aifs = skbdesc->ring->tx_params.aifs;
 601
 602         /*
 603          * Identify queue
 604          */
 605         if (control->queue < rt2x00dev->hw->queues)
 606                 desc.queue = control->queue;
 607         else if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 608                  control->queue == IEEE80211_TX_QUEUE_AFTER_BEACON)
 609                 desc.queue = QUEUE_MGMT;
 610         else
 611                 desc.queue = QUEUE_OTHER;
 612
 613         /*
 614          * Read required fields from ieee80211 header.
 615          */
 616         frame_control = le16_to_cpu(ieee80211hdr->frame_control);
 617         seq_ctrl = le16_to_cpu(ieee80211hdr->seq_ctrl);
 618
 619         tx_rate = control->tx_rate;
 620
 621         /*
 622          * Check whether this frame is to be acked
 623          */
 624         if (!(control->flags & IEEE80211_TXCTL_NO_ACK))
 625                 __set_bit(ENTRY_TXD_ACK, &desc.flags);
 626
 627         /*
 628          * Check if this is a RTS/CTS frame
 629          */
 630         if (is_rts_frame(frame_control) || is_cts_frame(frame_control)) {
 631                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 632                 if (is_rts_frame(frame_control)) {
 633                         __set_bit(ENTRY_TXD_RTS_FRAME, &desc.flags);
 634                         __set_bit(ENTRY_TXD_ACK, &desc.flags);
 635                 } else
 636                         __clear_bit(ENTRY_TXD_ACK, &desc.flags);
 637                 if (control->rts_cts_rate)
 638                         tx_rate = control->rts_cts_rate;
 639         }
 640
 641         /*
 642          * Check for OFDM
 643          */
 644         if (DEVICE_GET_RATE_FIELD(tx_rate, RATEMASK) & DEV_OFDM_RATEMASK)
 645                 __set_bit(ENTRY_TXD_OFDM_RATE, &desc.flags);
 646
 647         /*
 648          * Check if more fragments are pending
 649          */
 650         if (ieee80211_get_morefrag(ieee80211hdr)) {
 651                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 652                 __set_bit(ENTRY_TXD_MORE_FRAG, &desc.flags);
 653         }
 654
 655         /*
 656          * Beacons and probe responses require the tsf timestamp
 657          * to be inserted into the frame.
 658          */
 659         if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 660             is_probe_resp(frame_control))
 661                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &desc.flags);
 662
 663         /*
 664          * Determine with what IFS priority this frame should be send.
 665          * Set ifs to IFS_SIFS when the this is not the first fragment,
 666          * or this fragment came after RTS/CTS.
 667          */
 668         if ((seq_ctrl & IEEE80211_SCTL_FRAG) > 0 ||
 669             test_bit(ENTRY_TXD_RTS_FRAME, &desc.flags))
 670                 desc.ifs = IFS_SIFS;
 671         else
 672                 desc.ifs = IFS_BACKOFF;
 673
 674         /*
 675          * PLCP setup
 676          * Length calculation depends on OFDM/CCK rate.
 677          */
 678         desc.signal = DEVICE_GET_RATE_FIELD(tx_rate, PLCP);
 679         desc.service = 0x04;
 680
 681         length = skbdesc->data_len + FCS_LEN;
 682         if (test_bit(ENTRY_TXD_OFDM_RATE, &desc.flags)) {
 683                 desc.length_high = (length >> 6) & 0x3f;
 684                 desc.length_low = length & 0x3f;
 685         } else {
 686                 bitrate = DEVICE_GET_RATE_FIELD(tx_rate, RATE);
 687
 688                 /*
 689                  * Convert length to microseconds.
 690                  */
 691                 residual = get_duration_res(length, bitrate);
 692                 duration = get_duration(length, bitrate);
 693
 694                 if (residual != 0) {
 695                         duration++;
 696
 697                         /*
 698                          * Check if we need to set the Length Extension
 699                          */
 700                         if (bitrate == 110 && residual <= 30)
 701                                 desc.service |= 0x80;
 702                 }
 703
 704                 desc.length_high = (duration >> 8) & 0xff;
 705                 desc.length_low = duration & 0xff;
 706
 707                 /*
 708                  * When preamble is enabled we should set the
 709                  * preamble bit for the signal.
 710                  */
 711                 if (DEVICE_GET_RATE_FIELD(tx_rate, PREAMBLE))
 712                         desc.signal |= 0x08;
 713         }
 714
 715         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, txd, &desc, ieee80211hdr,
 716                                            skbdesc->data_len, control);
 717
 718         /*
 719          * Update ring entry.
 720          */
 721         skbdesc->entry->skb = skb;
 722         memcpy(&skbdesc->entry->tx_status.control, control, sizeof(*control));
 723
 724         /*
 725          * The frame has been completely initialized and ready
 726          * for sending to the device. The caller will push the
 727          * frame to the device, but we are going to push the
 728          * frame to debugfs here.
 729          */
 730         skbdesc->frame_type = DUMP_FRAME_TX;
 731         rt2x00debug_dump_frame(rt2x00dev, skb);
 732 }
 733 EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc);
 734
 735 /*
 736  * Driver initialization handlers.
 737  */
 738 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 739                               const int channel, const int tx_power,
 740                               const int value)
 741 {
 742         entry->chan = channel;
 743         if (channel <= 14)
 744                 entry->freq = 2407 + (5 * channel);
 745         else
 746                 entry->freq = 5000 + (5 * channel);
 747         entry->val = value;
 748         entry->flag =
 749             IEEE80211_CHAN_W_IBSS |
 750             IEEE80211_CHAN_W_ACTIVE_SCAN |
 751             IEEE80211_CHAN_W_SCAN;
 752         entry->power_level = tx_power;
 753         entry->antenna_max = 0xff;
 754 }
 755
 756 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 757                            const int rate, const int mask,
 758                            const int plcp, const int flags)
 759 {
 760         entry->rate = rate;
 761         entry->val =
 762             DEVICE_SET_RATE_FIELD(rate, RATE) |
 763             DEVICE_SET_RATE_FIELD(mask, RATEMASK) |
 764             DEVICE_SET_RATE_FIELD(plcp, PLCP);
 765         entry->flags = flags;
 766         entry->val2 = entry->val;
 767         if (entry->flags & IEEE80211_RATE_PREAMBLE2)
 768                 entry->val2 |= DEVICE_SET_RATE_FIELD(1, PREAMBLE);
 769         entry->min_rssi_ack = 0;
 770         entry->min_rssi_ack_delta = 0;
 771 }
 772
 773 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 774                                     struct hw_mode_spec *spec)
 775 {
 776         struct ieee80211_hw *hw = rt2x00dev->hw;
 777         struct ieee80211_hw_mode *hwmodes;
 778         struct ieee80211_channel *channels;
 779         struct ieee80211_rate *rates;
 780         unsigned int i;
 781         unsigned char tx_power;
 782
 783         hwmodes = kzalloc(sizeof(*hwmodes) * spec->num_modes, GFP_KERNEL);
 784         if (!hwmodes)
 785                 goto exit;
 786
 787         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 788         if (!channels)
 789                 goto exit_free_modes;
 790
 791         rates = kzalloc(sizeof(*rates) * spec->num_rates, GFP_KERNEL);
 792         if (!rates)
 793                 goto exit_free_channels;
 794
 795         /*
 796          * Initialize Rate list.
 797          */
 798         rt2x00lib_rate(&rates[0], 10, DEV_RATEMASK_1MB,
 799                        0x00, IEEE80211_RATE_CCK);
 800         rt2x00lib_rate(&rates[1], 20, DEV_RATEMASK_2MB,
 801                        0x01, IEEE80211_RATE_CCK_2);
 802         rt2x00lib_rate(&rates[2], 55, DEV_RATEMASK_5_5MB,
 803                        0x02, IEEE80211_RATE_CCK_2);
 804         rt2x00lib_rate(&rates[3], 110, DEV_RATEMASK_11MB,
 805                        0x03, IEEE80211_RATE_CCK_2);
 806
 807         if (spec->num_rates > 4) {
 808                 rt2x00lib_rate(&rates[4], 60, DEV_RATEMASK_6MB,
 809                                0x0b, IEEE80211_RATE_OFDM);
 810                 rt2x00lib_rate(&rates[5], 90, DEV_RATEMASK_9MB,
 811                                0x0f, IEEE80211_RATE_OFDM);
 812                 rt2x00lib_rate(&rates[6], 120, DEV_RATEMASK_12MB,
 813                                0x0a, IEEE80211_RATE_OFDM);
 814                 rt2x00lib_rate(&rates[7], 180, DEV_RATEMASK_18MB,
 815                                0x0e, IEEE80211_RATE_OFDM);
 816                 rt2x00lib_rate(&rates[8], 240, DEV_RATEMASK_24MB,
 817                                0x09, IEEE80211_RATE_OFDM);
 818                 rt2x00lib_rate(&rates[9], 360, DEV_RATEMASK_36MB,
 819                                0x0d, IEEE80211_RATE_OFDM);
 820                 rt2x00lib_rate(&rates[10], 480, DEV_RATEMASK_48MB,
 821                                0x08, IEEE80211_RATE_OFDM);
 822                 rt2x00lib_rate(&rates[11], 540, DEV_RATEMASK_54MB,
 823                                0x0c, IEEE80211_RATE_OFDM);
 824         }
 825
 826         /*
 827          * Initialize Channel list.
 828          */
 829         for (i = 0; i < spec->num_channels; i++) {
 830                 if (spec->channels[i].channel <= 14)
 831                         tx_power = spec->tx_power_bg[i];
 832                 else if (spec->tx_power_a)
 833                         tx_power = spec->tx_power_a[i];
 834                 else
 835                         tx_power = spec->tx_power_default;
 836
 837                 rt2x00lib_channel(&channels[i],
 838                                   spec->channels[i].channel, tx_power, i);
 839         }
 840
 841         /*
 842          * Intitialize 802.11b
 843          * Rates: CCK.
 844          * Channels: OFDM.
 845          */
 846         if (spec->num_modes > HWMODE_B) {
 847                 hwmodes[HWMODE_B].mode = MODE_IEEE80211B;
 848                 hwmodes[HWMODE_B].num_channels = 14;
 849                 hwmodes[HWMODE_B].num_rates = 4;
 850                 hwmodes[HWMODE_B].channels = channels;
 851                 hwmodes[HWMODE_B].rates = rates;
 852         }
 853
 854         /*
 855          * Intitialize 802.11g
 856          * Rates: CCK, OFDM.
 857          * Channels: OFDM.
 858          */
 859         if (spec->num_modes > HWMODE_G) {
 860                 hwmodes[HWMODE_G].mode = MODE_IEEE80211G;
 861                 hwmodes[HWMODE_G].num_channels = 14;
 862                 hwmodes[HWMODE_G].num_rates = spec->num_rates;
 863                 hwmodes[HWMODE_G].channels = channels;
 864                 hwmodes[HWMODE_G].rates = rates;
 865         }
 866
 867         /*
 868          * Intitialize 802.11a
 869          * Rates: OFDM.
 870          * Channels: OFDM, UNII, HiperLAN2.
 871          */
 872         if (spec->num_modes > HWMODE_A) {
 873                 hwmodes[HWMODE_A].mode = MODE_IEEE80211A;
 874                 hwmodes[HWMODE_A].num_channels = spec->num_channels - 14;
 875                 hwmodes[HWMODE_A].num_rates = spec->num_rates - 4;
 876                 hwmodes[HWMODE_A].channels = &channels[14];
 877                 hwmodes[HWMODE_A].rates = &rates[4];
 878         }
 879
 880         if (spec->num_modes > HWMODE_G &&
 881             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_G]))
 882                 goto exit_free_rates;
 883
 884         if (spec->num_modes > HWMODE_B &&
 885             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_B]))
 886                 goto exit_free_rates;
 887
 888         if (spec->num_modes > HWMODE_A &&
 889             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_A]))
 890                 goto exit_free_rates;
 891
 892         rt2x00dev->hwmodes = hwmodes;
 893
 894         return 0;
 895
 896 exit_free_rates:
 897         kfree(rates);
 898
 899 exit_free_channels:
 900         kfree(channels);
 901
 902 exit_free_modes:
 903         kfree(hwmodes);
 904
 905 exit:
 906         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 907         return -ENOMEM;
 908 }
 909
 910 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 911 {
 912         if (test_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags))
 913                 ieee80211_unregister_hw(rt2x00dev->hw);
 914
 915         if (likely(rt2x00dev->hwmodes)) {
 916                 kfree(rt2x00dev->hwmodes->channels);
 917                 kfree(rt2x00dev->hwmodes->rates);
 918                 kfree(rt2x00dev->hwmodes);
 919                 rt2x00dev->hwmodes = NULL;
 920         }
 921 }
 922
 923 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 924 {
 925         struct hw_mode_spec *spec = &rt2x00dev->spec;
 926         int status;
 927
 928         /*
 929          * Initialize HW modes.
 930          */
 931         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 932         if (status)
 933                 return status;
 934
 935         /*
 936          * Register HW.
 937          */
 938         status = ieee80211_register_hw(rt2x00dev->hw);
 939         if (status) {
 940                 rt2x00lib_remove_hw(rt2x00dev);
 941                 return status;
 942         }
 943
 944         __set_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags);
 945
 946         return 0;
 947 }
 948
 949 /*
 950  * Initialization/uninitialization handlers.
 951  */
 952 static int rt2x00lib_alloc_entries(struct data_ring *ring,
 953                                    const u16 max_entries, const u16 data_size,
 954                                    const u16 desc_size)
 955 {
 956         struct data_entry *entry;
 957         unsigned int i;
 958
 959         ring->stats.limit = max_entries;
 960         ring->data_size = data_size;
 961         ring->desc_size = desc_size;
 962
 963         /*
 964          * Allocate all ring entries.
 965          */
 966         entry = kzalloc(ring->stats.limit * sizeof(*entry), GFP_KERNEL);
 967         if (!entry)
 968                 return -ENOMEM;
 969
 970         for (i = 0; i < ring->stats.limit; i++) {
 971                 entry[i].flags = 0;
 972                 entry[i].ring = ring;
 973                 entry[i].skb = NULL;
 974         }
 975
 976         ring->entry = entry;
 977
 978         return 0;
 979 }
 980
 981 static int rt2x00lib_alloc_ring_entries(struct rt2x00_dev *rt2x00dev)
 982 {
 983         struct data_ring *ring;
 984
 985         /*
 986          * Allocate the RX ring.
 987          */
 988         if (rt2x00lib_alloc_entries(rt2x00dev->rx, RX_ENTRIES, DATA_FRAME_SIZE,
 989                                     rt2x00dev->ops->rxd_size))
 990                 return -ENOMEM;
 991
 992         /*
 993          * First allocate the TX rings.
 994          */
 995         txring_for_each(rt2x00dev, ring) {
 996                 if (rt2x00lib_alloc_entries(ring, TX_ENTRIES, DATA_FRAME_SIZE,
 997                                             rt2x00dev->ops->txd_size))
 998                         return -ENOMEM;
 999         }
1000
1001         if (!test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
1002                 return 0;
1003
1004         /*
1005          * Allocate the BEACON ring.
1006          */
1007         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[0], BEACON_ENTRIES,
1008                                     MGMT_FRAME_SIZE, rt2x00dev->ops->txd_size))
1009                 return -ENOMEM;
1010
1011         /*
1012          * Allocate the Atim ring.
1013          */
1014         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[1], ATIM_ENTRIES,
1015                                     DATA_FRAME_SIZE, rt2x00dev->ops->txd_size))
1016                 return -ENOMEM;
1017
1018         return 0;
1019 }
1020
1021 static void rt2x00lib_free_ring_entries(struct rt2x00_dev *rt2x00dev)
1022 {
1023         struct data_ring *ring;
1024
1025         ring_for_each(rt2x00dev, ring) {
1026                 kfree(ring->entry);
1027                 ring->entry = NULL;
1028         }
1029 }
1030
1031 void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
1032 {
1033         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1034                 return;
1035
1036         /*
1037          * Unregister rfkill.
1038          */
1039         rt2x00rfkill_unregister(rt2x00dev);
1040
1041         /*
1042          * Allow the HW to uninitialize.
1043          */
1044         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1045
1046         /*
1047          * Free allocated ring entries.
1048          */
1049         rt2x00lib_free_ring_entries(rt2x00dev);
1050 }
1051
1052 int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1053 {
1054         int status;
1055
1056         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
1057                 return 0;
1058
1059         /*
1060          * Allocate all ring entries.
1061          */
1062         status = rt2x00lib_alloc_ring_entries(rt2x00dev);
1063         if (status) {
1064                 ERROR(rt2x00dev, "Ring entries allocation failed.\n");
1065                 return status;
1066         }
1067
1068         /*
1069          * Initialize the device.
1070          */
1071         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1072         if (status)
1073                 goto exit;
1074
1075         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
1076
1077         /*
1078          * Register the rfkill handler.
1079          */
1080         status = rt2x00rfkill_register(rt2x00dev);
1081         if (status)
1082                 goto exit_unitialize;
1083
1084         return 0;
1085
1086 exit_unitialize:
1087         rt2x00lib_uninitialize(rt2x00dev);
1088
1089 exit:
1090         rt2x00lib_free_ring_entries(rt2x00dev);
1091
1092         return status;
1093 }
1094
1095 /*
1096  * driver allocation handlers.
1097  */
1098 static int rt2x00lib_alloc_rings(struct rt2x00_dev *rt2x00dev)
1099 {
1100         struct data_ring *ring;
1101
1102         /*
1103          * We need the following rings:
1104          * RX: 1
1105          * TX: hw->queues
1106          * Beacon: 1 (if required)
1107          * Atim: 1 (if required)
1108          */
1109         rt2x00dev->data_rings = 1 + rt2x00dev->hw->queues +
1110             (2 * test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags));
1111
1112         ring = kzalloc(rt2x00dev->data_rings * sizeof(*ring), GFP_KERNEL);
1113         if (!ring) {
1114                 ERROR(rt2x00dev, "Ring allocation failed.\n");
1115                 return -ENOMEM;
1116         }
1117
1118         /*
1119          * Initialize pointers
1120          */
1121         rt2x00dev->rx = ring;
1122         rt2x00dev->tx = &rt2x00dev->rx[1];
1123         if (test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
1124                 rt2x00dev->bcn = &rt2x00dev->tx[rt2x00dev->hw->queues];
1125
1126         /*
1127          * Initialize ring parameters.
1128          * cw_min: 2^5 = 32.
1129          * cw_max: 2^10 = 1024.
1130          */
1131         ring_for_each(rt2x00dev, ring) {
1132                 ring->rt2x00dev = rt2x00dev;
1133                 ring->tx_params.aifs = 2;
1134                 ring->tx_params.cw_min = 5;
1135                 ring->tx_params.cw_max = 10;
1136         }
1137
1138         return 0;
1139 }
1140
1141 static void rt2x00lib_free_rings(struct rt2x00_dev *rt2x00dev)
1142 {
1143         kfree(rt2x00dev->rx);
1144         rt2x00dev->rx = NULL;
1145         rt2x00dev->tx = NULL;
1146         rt2x00dev->bcn = NULL;
1147 }
1148
1149 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1150 {
1151         int retval = -ENOMEM;
1152
1153         /*
1154          * Let the driver probe the device to detect the capabilities.
1155          */
1156         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1157         if (retval) {
1158                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1159                 goto exit;
1160         }
1161
1162         /*
1163          * Initialize configuration work.
1164          */
1165         INIT_WORK(&rt2x00dev->beacon_work, rt2x00lib_beacondone_scheduled);
1166         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
1167         INIT_WORK(&rt2x00dev->config_work, rt2x00lib_configuration_scheduled);
1168         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
1169
1170         /*
1171          * Reset current working type.
1172          */
1173         rt2x00dev->interface.type = INVALID_INTERFACE;
1174
1175         /*
1176          * Allocate ring array.
1177          */
1178         retval = rt2x00lib_alloc_rings(rt2x00dev);
1179         if (retval)
1180                 goto exit;
1181
1182         /*
1183          * Initialize ieee80211 structure.
1184          */
1185         retval = rt2x00lib_probe_hw(rt2x00dev);
1186         if (retval) {
1187                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1188                 goto exit;
1189         }
1190
1191         /*
1192          * Allocatie rfkill.
1193          */
1194         retval = rt2x00rfkill_allocate(rt2x00dev);
1195         if (retval)
1196                 goto exit;
1197
1198         /*
1199          * Open the debugfs entry.
1200          */
1201         rt2x00debug_register(rt2x00dev);
1202
1203         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1204
1205         return 0;
1206
1207 exit:
1208         rt2x00lib_remove_dev(rt2x00dev);
1209
1210         return retval;
1211 }
1212 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1213
1214 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1215 {
1216         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1217
1218         /*
1219          * Disable radio.
1220          */
1221         rt2x00lib_disable_radio(rt2x00dev);
1222
1223         /*
1224          * Uninitialize device.
1225          */
1226         rt2x00lib_uninitialize(rt2x00dev);
1227
1228         /*
1229          * Close debugfs entry.
1230          */
1231         rt2x00debug_deregister(rt2x00dev);
1232
1233         /*
1234          * Free rfkill
1235          */
1236         rt2x00rfkill_free(rt2x00dev);
1237
1238         /*
1239          * Free ieee80211_hw memory.
1240          */
1241         rt2x00lib_remove_hw(rt2x00dev);
1242
1243         /*
1244          * Free firmware image.
1245          */
1246         rt2x00lib_free_firmware(rt2x00dev);
1247
1248         /*
1249          * Free ring structures.
1250          */
1251         rt2x00lib_free_rings(rt2x00dev);
1252 }
1253 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1254
1255 /*
1256  * Device state handlers
1257  */
1258 #ifdef CONFIG_PM
1259 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1260 {
1261         int retval;
1262
1263         NOTICE(rt2x00dev, "Going to sleep.\n");
1264         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1265
1266         /*
1267          * Only continue if mac80211 has open interfaces.
1268          */
1269         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1270                 goto exit;
1271         __set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
1272
1273         /*
1274          * Disable radio and unitialize all items
1275          * that must be recreated on resume.
1276          */
1277         rt2x00mac_stop(rt2x00dev->hw);
1278         rt2x00lib_uninitialize(rt2x00dev);
1279         rt2x00debug_deregister(rt2x00dev);
1280
1281 exit:
1282         /*
1283          * Set device mode to sleep for power management.
1284          */
1285         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1286         if (retval)
1287                 return retval;
1288
1289         return 0;
1290 }
1291 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1292
1293 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1294 {
1295         struct interface *intf = &rt2x00dev->interface;
1296         int retval;
1297
1298         NOTICE(rt2x00dev, "Waking up.\n");
1299         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1300
1301         /*
1302          * Open the debugfs entry.
1303          */
1304         rt2x00debug_register(rt2x00dev);
1305
1306         /*
1307          * Only continue if mac80211 had open interfaces.
1308          */
1309         if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
1310                 return 0;
1311
1312         /*
1313          * Reinitialize device and all active interfaces.
1314          */
1315         retval = rt2x00mac_start(rt2x00dev->hw);
1316         if (retval)
1317                 goto exit;
1318
1319         /*
1320          * Reconfigure device.
1321          */
1322         rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
1323         if (!rt2x00dev->hw->conf.radio_enabled)
1324                 rt2x00lib_disable_radio(rt2x00dev);
1325
1326         rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
1327         rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
1328         rt2x00lib_config_type(rt2x00dev, intf->type);
1329
1330         /*
1331          * It is possible that during that mac80211 has attempted
1332          * to send frames while we were suspending or resuming.
1333          * In that case we have disabled the TX queue and should
1334          * now enable it again
1335          */
1336         ieee80211_start_queues(rt2x00dev->hw);
1337
1338         /*
1339          * When in Master or Ad-hoc mode,
1340          * restart Beacon transmitting by faking a beacondone event.
1341          */
1342         if (intf->type == IEEE80211_IF_TYPE_AP ||
1343             intf->type == IEEE80211_IF_TYPE_IBSS)
1344                 rt2x00lib_beacondone(rt2x00dev);
1345
1346         return 0;
1347
1348 exit:
1349         rt2x00lib_disable_radio(rt2x00dev);
1350         rt2x00lib_uninitialize(rt2x00dev);
1351         rt2x00debug_deregister(rt2x00dev);
1352
1353         return retval;
1354 }
1355 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1356 #endif /* CONFIG_PM */
1357
1358 /*
1359  * rt2x00lib module information.
1360  */
1361 MODULE_AUTHOR(DRV_PROJECT);
1362 MODULE_VERSION(DRV_VERSION);
1363 MODULE_DESCRIPTION("rt2x00 library");
1364 MODULE_LICENSE("GPL");