package/rt2x00/src/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 /*
  27  * Set enviroment defines for rt2x00.h
  28  */
  29 #define DRV_NAME "rt2x00lib"
  30
  31 #include <linux/kernel.h>
  32 #include <linux/module.h>
  33
  34 #include "rt2x00.h"
  35 #include "rt2x00lib.h"
  36
  37 /*
  38  * Ring handler.
  39  */
  40 struct data_ring *rt2x00lib_get_ring(struct rt2x00_dev *rt2x00dev,
  41                                      const unsigned int queue)
  42 {
  43         int beacon = test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags);
  44
  45         /*
  46          * Check if we are requesting a reqular TX ring,
  47          * or if we are requesting a Beacon or Atim ring.
  48          * For Atim rings, we should check if it is supported.
  49          */
  50         if (queue < rt2x00dev->hw->queues && rt2x00dev->tx)
  51                 return &rt2x00dev->tx[queue];
  52
  53         if (!rt2x00dev->bcn || !beacon)
  54                 return NULL;
  55
  56         if (queue == IEEE80211_TX_QUEUE_BEACON)
  57                 return &rt2x00dev->bcn[0];
  58         else if (queue == IEEE80211_TX_QUEUE_AFTER_BEACON)
  59                 return &rt2x00dev->bcn[1];
  60
  61         return NULL;
  62 }
  63 EXPORT_SYMBOL_GPL(rt2x00lib_get_ring);
  64
  65 /*
  66  * Link tuning handlers
  67  */
  68 static void rt2x00lib_start_link_tuner(struct rt2x00_dev *rt2x00dev)
  69 {
  70         rt2x00_clear_link(&rt2x00dev->link);
  71
  72         /*
  73          * Reset the link tuner.
  74          */
  75         rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
  76
  77         queue_delayed_work(rt2x00dev->hw->workqueue,
  78                            &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
  79 }
  80
  81 static void rt2x00lib_stop_link_tuner(struct rt2x00_dev *rt2x00dev)
  82 {
  83         cancel_delayed_work_sync(&rt2x00dev->link.work);
  84 }
  85
  86 void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
  87 {
  88         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
  89                 return;
  90
  91         rt2x00lib_stop_link_tuner(rt2x00dev);
  92         rt2x00lib_start_link_tuner(rt2x00dev);
  93 }
  94
  95 /*
  96  * Radio control handlers.
  97  */
  98 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  99 {
 100         int status;
 101
 102         /*
 103          * Don't enable the radio twice.
 104          * And check if the hardware button has been disabled.
 105          */
 106         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 107             test_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags))
 108                 return 0;
 109
 110         /*
 111          * Enable radio.
 112          */
 113         status = rt2x00dev->ops->lib->set_device_state(rt2x00dev,
 114                                                        STATE_RADIO_ON);
 115         if (status)
 116                 return status;
 117
 118         __set_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags);
 119
 120         /*
 121          * Enable RX.
 122          */
 123         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 124
 125         /*
 126          * Start the TX queues.
 127          */
 128         ieee80211_start_queues(rt2x00dev->hw);
 129
 130         return 0;
 131 }
 132
 133 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
 134 {
 135         if (!__test_and_clear_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 136                 return;
 137
 138         /*
 139          * Stop all scheduled work.
 140          */
 141         if (work_pending(&rt2x00dev->beacon_work))
 142                 cancel_work_sync(&rt2x00dev->beacon_work);
 143         if (work_pending(&rt2x00dev->filter_work))
 144                 cancel_work_sync(&rt2x00dev->filter_work);
 145         if (work_pending(&rt2x00dev->config_work))
 146                 cancel_work_sync(&rt2x00dev->config_work);
 147
 148         /*
 149          * Stop the TX queues.
 150          */
 151         ieee80211_stop_queues(rt2x00dev->hw);
 152
 153         /*
 154          * Disable RX.
 155          */
 156         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 157
 158         /*
 159          * Disable radio.
 160          */
 161         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 162 }
 163
 164 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 165 {
 166         /*
 167          * When we are disabling the RX, we should also stop the link tuner.
 168          */
 169         if (state == STATE_RADIO_RX_OFF)
 170                 rt2x00lib_stop_link_tuner(rt2x00dev);
 171
 172         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 173
 174         /*
 175          * When we are enabling the RX, we should also start the link tuner.
 176          */
 177         if (state == STATE_RADIO_RX_ON &&
 178             is_interface_present(&rt2x00dev->interface))
 179                 rt2x00lib_start_link_tuner(rt2x00dev);
 180 }
 181
 182 static void rt2x00lib_precalculate_link_signal(struct link *link)
 183 {
 184         if (link->rx_failed || link->rx_success)
 185                 link->rx_percentage =
 186                     (link->rx_success * 100) /
 187                     (link->rx_failed + link->rx_success);
 188         else
 189                 link->rx_percentage = 50;
 190
 191         if (link->tx_failed || link->tx_success)
 192                 link->tx_percentage =
 193                     (link->tx_success * 100) /
 194                     (link->tx_failed + link->tx_success);
 195         else
 196                 link->tx_percentage = 50;
 197
 198         link->rx_success = 0;
 199         link->rx_failed = 0;
 200         link->tx_success = 0;
 201         link->tx_failed = 0;
 202 }
 203
 204 static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
 205                                            int rssi)
 206 {
 207         int rssi_percentage = 0;
 208         int signal;
 209
 210         /*
 211          * We need a positive value for the RSSI.
 212          */
 213         if (rssi < 0)
 214                 rssi += rt2x00dev->rssi_offset;
 215
 216         /*
 217          * Calculate the different percentages,
 218          * which will be used for the signal.
 219          */
 220         if (rt2x00dev->rssi_offset)
 221                 rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
 222
 223         /*
 224          * Add the individual percentages and use the WEIGHT
 225          * defines to calculate the current link signal.
 226          */
 227         signal = ((WEIGHT_RSSI * rssi_percentage) +
 228                   (WEIGHT_TX * rt2x00dev->link.tx_percentage) +
 229                   (WEIGHT_RX * rt2x00dev->link.rx_percentage)) / 100;
 230
 231         return (signal > 100) ? 100 : signal;
 232 }
 233
 234 static void rt2x00lib_link_tuner(struct work_struct *work)
 235 {
 236         struct rt2x00_dev *rt2x00dev =
 237             container_of(work, struct rt2x00_dev, link.work.work);
 238
 239         /*
 240          * When the radio is shutting down we should
 241          * immediately cease all link tuning.
 242          */
 243         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 244                 return;
 245
 246         /*
 247          * Update statistics.
 248          */
 249         rt2x00dev->ops->lib->link_stats(rt2x00dev);
 250
 251         rt2x00dev->low_level_stats.dot11FCSErrorCount +=
 252             rt2x00dev->link.rx_failed;
 253
 254         /*
 255          * Only perform the link tuning when Link tuning
 256          * has been enabled (This could have been disabled from the EEPROM).
 257          */
 258         if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
 259                 rt2x00dev->ops->lib->link_tuner(rt2x00dev);
 260
 261         /*
 262          * Precalculate a portion of the link signal which is
 263          * in based on the tx/rx success/failure counters.
 264          */
 265         rt2x00lib_precalculate_link_signal(&rt2x00dev->link);
 266
 267         /*
 268          * Increase tuner counter, and reschedule the next link tuner run.
 269          */
 270         rt2x00dev->link.count++;
 271         queue_delayed_work(rt2x00dev->hw->workqueue, &rt2x00dev->link.work,
 272                            LINK_TUNE_INTERVAL);
 273 }
 274
 275 static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
 276 {
 277         struct rt2x00_dev *rt2x00dev =
 278             container_of(work, struct rt2x00_dev, filter_work);
 279         unsigned int filter = rt2x00dev->interface.filter;
 280
 281         /*
 282          * Since we had stored the filter inside interface.filter,
 283          * we should now clear that field. Otherwise the driver will
 284          * assume nothing has changed (*total_flags will be compared
 285          * to interface.filter to determine if any action is required).
 286          */
 287         rt2x00dev->interface.filter = 0;
 288
 289         rt2x00dev->ops->hw->configure_filter(rt2x00dev->hw,
 290                                              filter, &filter, 0, NULL);
 291 }
 292
 293 static void rt2x00lib_configuration_scheduled(struct work_struct *work)
 294 {
 295         struct rt2x00_dev *rt2x00dev =
 296             container_of(work, struct rt2x00_dev, config_work);
 297         int preamble = !test_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
 298
 299         rt2x00mac_erp_ie_changed(rt2x00dev->hw,
 300                                  IEEE80211_ERP_CHANGE_PREAMBLE, 0, preamble);
 301 }
 302
 303 /*
 304  * Interrupt context handlers.
 305  */
 306 static void rt2x00lib_beacondone_scheduled(struct work_struct *work)
 307 {
 308         struct rt2x00_dev *rt2x00dev =
 309             container_of(work, struct rt2x00_dev, beacon_work);
 310         struct data_ring *ring =
 311             rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
 312         struct data_entry *entry = rt2x00_get_data_entry(ring);
 313         struct sk_buff *skb;
 314
 315         skb = ieee80211_beacon_get(rt2x00dev->hw,
 316                                    rt2x00dev->interface.id,
 317                                    &entry->tx_status.control);
 318         if (!skb)
 319                 return;
 320
 321         rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, skb,
 322                                           &entry->tx_status.control);
 323
 324         dev_kfree_skb(skb);
 325 }
 326
 327 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 328 {
 329         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 330                 return;
 331
 332         queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->beacon_work);
 333 }
 334 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 335
 336 void rt2x00lib_txdone(struct data_entry *entry,
 337                       const int status, const int retry)
 338 {
 339         struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
 340         struct ieee80211_tx_status *tx_status = &entry->tx_status;
 341         struct ieee80211_low_level_stats *stats = &rt2x00dev->low_level_stats;
 342         int success = !!(status == TX_SUCCESS || status == TX_SUCCESS_RETRY);
 343         int fail = !!(status == TX_FAIL_RETRY || status == TX_FAIL_INVALID ||
 344                       status == TX_FAIL_OTHER);
 345
 346         /*
 347          * Update TX statistics.
 348          */
 349         tx_status->flags = 0;
 350         tx_status->ack_signal = 0;
 351         tx_status->excessive_retries = (status == TX_FAIL_RETRY);
 352         tx_status->retry_count = retry;
 353         rt2x00dev->link.tx_success += success;
 354         rt2x00dev->link.tx_failed += retry + fail;
 355
 356         if (!(tx_status->control.flags & IEEE80211_TXCTL_NO_ACK)) {
 357                 if (success)
 358                         tx_status->flags |= IEEE80211_TX_STATUS_ACK;
 359                 else
 360                         stats->dot11ACKFailureCount++;
 361         }
 362
 363         tx_status->queue_length = entry->ring->stats.limit;
 364         tx_status->queue_number = tx_status->control.queue;
 365
 366         if (tx_status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) {
 367                 if (success)
 368                         stats->dot11RTSSuccessCount++;
 369                 else
 370                         stats->dot11RTSFailureCount++;
 371         }
 372
 373         /*
 374          * Send the tx_status to mac80211,
 375          * that method also cleans up the skb structure.
 376          */
 377         ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb, tx_status);
 378         entry->skb = NULL;
 379 }
 380 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 381
 382 void rt2x00lib_rxdone(struct data_entry *entry, struct sk_buff *skb,
 383                       struct rxdata_entry_desc *desc)
 384 {
 385         struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
 386         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 387         struct ieee80211_hw_mode *mode;
 388         struct ieee80211_rate *rate;
 389         unsigned int i;
 390         int val = 0;
 391
 392         /*
 393          * Update RX statistics.
 394          */
 395         mode = &rt2x00dev->hwmodes[rt2x00dev->curr_hwmode];
 396         for (i = 0; i < mode->num_rates; i++) {
 397                 rate = &mode->rates[i];
 398
 399                 /*
 400                  * When frame was received with an OFDM bitrate,
 401                  * the signal is the PLCP value. If it was received with
 402                  * a CCK bitrate the signal is the rate in 0.5kbit/s.
 403                  */
 404                 if (!desc->ofdm)
 405                         val = DEVICE_GET_RATE_FIELD(rate->val, RATE);
 406                 else
 407                         val = DEVICE_GET_RATE_FIELD(rate->val, PLCP);
 408
 409                 if (val == desc->signal) {
 410                         val = rate->val;
 411                         break;
 412                 }
 413         }
 414
 415         rt2x00_update_link_rssi(&rt2x00dev->link, desc->rssi);
 416         rt2x00dev->link.rx_success++;
 417         rx_status->rate = val;
 418         rx_status->signal =
 419             rt2x00lib_calculate_link_signal(rt2x00dev, desc->rssi);
 420         rx_status->ssi = desc->rssi;
 421         rx_status->flag = desc->flags;
 422
 423         /*
 424          * Send frame to mac80211
 425          */
 426         ieee80211_rx_irqsafe(rt2x00dev->hw, skb, rx_status);
 427 }
 428 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 429
 430 /*
 431  * TX descriptor initializer
 432  */
 433 void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 434                              struct data_desc *txd,
 435                              struct ieee80211_hdr *ieee80211hdr,
 436                              unsigned int length,
 437                              struct ieee80211_tx_control *control)
 438 {
 439         struct txdata_entry_desc desc;
 440         struct data_ring *ring;
 441         int tx_rate;
 442         int bitrate;
 443         int duration;
 444         int residual;
 445         u16 frame_control;
 446         u16 seq_ctrl;
 447
 448         /*
 449          * Make sure the descriptor is properly cleared.
 450          */
 451         memset(&desc, 0x00, sizeof(desc));
 452
 453         /*
 454          * Get ring pointer, if we fail to obtain the
 455          * correct ring, then use the first TX ring.
 456          */
 457         ring = rt2x00lib_get_ring(rt2x00dev, control->queue);
 458         if (!ring)
 459                 ring = rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_DATA0);
 460
 461         desc.cw_min = ring->tx_params.cw_min;
 462         desc.cw_max = ring->tx_params.cw_max;
 463         desc.aifs = ring->tx_params.aifs;
 464
 465         /*
 466          * Identify queue
 467          */
 468         if (control->queue < rt2x00dev->hw->queues)
 469                 desc.queue = control->queue;
 470         else if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 471                  control->queue == IEEE80211_TX_QUEUE_AFTER_BEACON)
 472                 desc.queue = QUEUE_MGMT;
 473         else
 474                 desc.queue = QUEUE_OTHER;
 475
 476         /*
 477          * Read required fields from ieee80211 header.
 478          */
 479         frame_control = le16_to_cpu(ieee80211hdr->frame_control);
 480         seq_ctrl = le16_to_cpu(ieee80211hdr->seq_ctrl);
 481
 482         tx_rate = control->tx_rate;
 483
 484         /*
 485          * Check if this is a RTS/CTS frame
 486          */
 487         if (is_rts_frame(frame_control) || is_cts_frame(frame_control)) {
 488                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 489                 if (is_rts_frame(frame_control))
 490                         __set_bit(ENTRY_TXD_RTS_FRAME, &desc.flags);
 491                 if (control->rts_cts_rate)
 492                         tx_rate = control->rts_cts_rate;
 493         }
 494
 495         /*
 496          * Check for OFDM
 497          */
 498         if (DEVICE_GET_RATE_FIELD(tx_rate, RATEMASK) & DEV_OFDM_RATEMASK)
 499                 __set_bit(ENTRY_TXD_OFDM_RATE, &desc.flags);
 500
 501         /*
 502          * Check if more fragments are pending
 503          */
 504         if (ieee80211_get_morefrag(ieee80211hdr)) {
 505                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 506                 __set_bit(ENTRY_TXD_MORE_FRAG, &desc.flags);
 507         }
 508
 509         /*
 510          * Beacons and probe responses require the tsf timestamp
 511          * to be inserted into the frame.
 512          */
 513         if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 514             is_probe_resp(frame_control))
 515                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &desc.flags);
 516
 517         /*
 518          * Determine with what IFS priority this frame should be send.
 519          * Set ifs to IFS_SIFS when the this is not the first fragment,
 520          * or this fragment came after RTS/CTS.
 521          */
 522         if ((seq_ctrl & IEEE80211_SCTL_FRAG) > 0 ||
 523             test_bit(ENTRY_TXD_RTS_FRAME, &desc.flags))
 524                 desc.ifs = IFS_SIFS;
 525         else
 526                 desc.ifs = IFS_BACKOFF;
 527
 528         /*
 529          * PLCP setup
 530          * Length calculation depends on OFDM/CCK rate.
 531          */
 532         desc.signal = DEVICE_GET_RATE_FIELD(tx_rate, PLCP);
 533         desc.service = 0x04;
 534
 535         if (test_bit(ENTRY_TXD_OFDM_RATE, &desc.flags)) {
 536                 desc.length_high = ((length + FCS_LEN) >> 6) & 0x3f;
 537                 desc.length_low = ((length + FCS_LEN) & 0x3f);
 538         } else {
 539                 bitrate = DEVICE_GET_RATE_FIELD(tx_rate, RATE);
 540
 541                 /*
 542                  * Convert length to microseconds.
 543                  */
 544                 residual = get_duration_res(length + FCS_LEN, bitrate);
 545                 duration = get_duration(length + FCS_LEN, bitrate);
 546
 547                 if (residual != 0) {
 548                         duration++;
 549
 550                         /*
 551                          * Check if we need to set the Length Extension
 552                          */
 553                         if (bitrate == 110 && residual <= 30)
 554                                 desc.service |= 0x80;
 555                 }
 556
 557                 desc.length_high = (duration >> 8) & 0xff;
 558                 desc.length_low = duration & 0xff;
 559
 560                 /*
 561                  * When preamble is enabled we should set the
 562                  * preamble bit for the signal.
 563                  */
 564                 if (DEVICE_GET_RATE_FIELD(tx_rate, PREAMBLE))
 565                         desc.signal |= 0x08;
 566         }
 567
 568         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, txd, &desc,
 569                                            ieee80211hdr, length, control);
 570 }
 571 EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc);
 572
 573 /*
 574  * Driver initialization handlers.
 575  */
 576 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 577                               const int channel, const int tx_power,
 578                               const int value)
 579 {
 580         entry->chan = channel;
 581         if (channel <= 14)
 582                 entry->freq = 2407 + (5 * channel);
 583         else
 584                 entry->freq = 5000 + (5 * channel);
 585         entry->val = value;
 586         entry->flag =
 587             IEEE80211_CHAN_W_IBSS |
 588             IEEE80211_CHAN_W_ACTIVE_SCAN |
 589             IEEE80211_CHAN_W_SCAN;
 590         entry->power_level = tx_power;
 591         entry->antenna_max = 0xff;
 592 }
 593
 594 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 595                            const int rate, const int mask,
 596                            const int plcp, const int flags)
 597 {
 598         entry->rate = rate;
 599         entry->val =
 600             DEVICE_SET_RATE_FIELD(rate, RATE) |
 601             DEVICE_SET_RATE_FIELD(mask, RATEMASK) |
 602             DEVICE_SET_RATE_FIELD(plcp, PLCP);
 603         entry->flags = flags;
 604         entry->val2 = entry->val;
 605         if (entry->flags & IEEE80211_RATE_PREAMBLE2)
 606                 entry->val2 |= DEVICE_SET_RATE_FIELD(1, PREAMBLE);
 607         entry->min_rssi_ack = 0;
 608         entry->min_rssi_ack_delta = 0;
 609 }
 610
 611 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 612                                     struct hw_mode_spec *spec)
 613 {
 614         struct ieee80211_hw *hw = rt2x00dev->hw;
 615         struct ieee80211_hw_mode *hwmodes;
 616         struct ieee80211_channel *channels;
 617         struct ieee80211_rate *rates;
 618         unsigned int i;
 619         unsigned char tx_power;
 620
 621         hwmodes = kzalloc(sizeof(*hwmodes) * spec->num_modes, GFP_KERNEL);
 622         if (!hwmodes)
 623                 goto exit;
 624
 625         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 626         if (!channels)
 627                 goto exit_free_modes;
 628
 629         rates = kzalloc(sizeof(*rates) * spec->num_rates, GFP_KERNEL);
 630         if (!rates)
 631                 goto exit_free_channels;
 632
 633         /*
 634          * Initialize Rate list.
 635          */
 636         rt2x00lib_rate(&rates[0], 10, DEV_RATEMASK_1MB,
 637                        0x00, IEEE80211_RATE_CCK);
 638         rt2x00lib_rate(&rates[1], 20, DEV_RATEMASK_2MB,
 639                        0x01, IEEE80211_RATE_CCK_2);
 640         rt2x00lib_rate(&rates[2], 55, DEV_RATEMASK_5_5MB,
 641                        0x02, IEEE80211_RATE_CCK_2);
 642         rt2x00lib_rate(&rates[3], 110, DEV_RATEMASK_11MB,
 643                        0x03, IEEE80211_RATE_CCK_2);
 644
 645         if (spec->num_rates > 4) {
 646                 rt2x00lib_rate(&rates[4], 60, DEV_RATEMASK_6MB,
 647                                0x0b, IEEE80211_RATE_OFDM);
 648                 rt2x00lib_rate(&rates[5], 90, DEV_RATEMASK_9MB,
 649                                0x0f, IEEE80211_RATE_OFDM);
 650                 rt2x00lib_rate(&rates[6], 120, DEV_RATEMASK_12MB,
 651                                0x0a, IEEE80211_RATE_OFDM);
 652                 rt2x00lib_rate(&rates[7], 180, DEV_RATEMASK_18MB,
 653                                0x0e, IEEE80211_RATE_OFDM);
 654                 rt2x00lib_rate(&rates[8], 240, DEV_RATEMASK_24MB,
 655                                0x09, IEEE80211_RATE_OFDM);
 656                 rt2x00lib_rate(&rates[9], 360, DEV_RATEMASK_36MB,
 657                                0x0d, IEEE80211_RATE_OFDM);
 658                 rt2x00lib_rate(&rates[10], 480, DEV_RATEMASK_48MB,
 659                                0x08, IEEE80211_RATE_OFDM);
 660                 rt2x00lib_rate(&rates[11], 540, DEV_RATEMASK_54MB,
 661                                0x0c, IEEE80211_RATE_OFDM);
 662         }
 663
 664         /*
 665          * Initialize Channel list.
 666          */
 667         for (i = 0; i < spec->num_channels; i++) {
 668                 if (spec->channels[i].channel <= 14)
 669                         tx_power = spec->tx_power_bg[i];
 670                 else if (spec->tx_power_a)
 671                         tx_power = spec->tx_power_a[i];
 672                 else
 673                         tx_power = spec->tx_power_default;
 674
 675                 rt2x00lib_channel(&channels[i],
 676                                   spec->channels[i].channel, tx_power, i);
 677         }
 678
 679         /*
 680          * Intitialize 802.11b
 681          * Rates: CCK.
 682          * Channels: OFDM.
 683          */
 684         if (spec->num_modes > HWMODE_B) {
 685                 hwmodes[HWMODE_B].mode = MODE_IEEE80211B;
 686                 hwmodes[HWMODE_B].num_channels = 14;
 687                 hwmodes[HWMODE_B].num_rates = 4;
 688                 hwmodes[HWMODE_B].channels = channels;
 689                 hwmodes[HWMODE_B].rates = rates;
 690         }
 691
 692         /*
 693          * Intitialize 802.11g
 694          * Rates: CCK, OFDM.
 695          * Channels: OFDM.
 696          */
 697         if (spec->num_modes > HWMODE_G) {
 698                 hwmodes[HWMODE_G].mode = MODE_IEEE80211G;
 699                 hwmodes[HWMODE_G].num_channels = 14;
 700                 hwmodes[HWMODE_G].num_rates = spec->num_rates;
 701                 hwmodes[HWMODE_G].channels = channels;
 702                 hwmodes[HWMODE_G].rates = rates;
 703         }
 704
 705         /*
 706          * Intitialize 802.11a
 707          * Rates: OFDM.
 708          * Channels: OFDM, UNII, HiperLAN2.
 709          */
 710         if (spec->num_modes > HWMODE_A) {
 711                 hwmodes[HWMODE_A].mode = MODE_IEEE80211A;
 712                 hwmodes[HWMODE_A].num_channels = spec->num_channels - 14;
 713                 hwmodes[HWMODE_A].num_rates = spec->num_rates - 4;
 714                 hwmodes[HWMODE_A].channels = &channels[14];
 715                 hwmodes[HWMODE_A].rates = &rates[4];
 716         }
 717
 718         if (spec->num_modes > HWMODE_G &&
 719             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_G]))
 720                 goto exit_free_rates;
 721
 722         if (spec->num_modes > HWMODE_B &&
 723             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_B]))
 724                 goto exit_free_rates;
 725
 726         if (spec->num_modes > HWMODE_A &&
 727             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_A]))
 728                 goto exit_free_rates;
 729
 730         rt2x00dev->hwmodes = hwmodes;
 731
 732         return 0;
 733
 734 exit_free_rates:
 735         kfree(rates);
 736
 737 exit_free_channels:
 738         kfree(channels);
 739
 740 exit_free_modes:
 741         kfree(hwmodes);
 742
 743 exit:
 744         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 745         return -ENOMEM;
 746 }
 747
 748 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 749 {
 750         if (test_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags))
 751                 ieee80211_unregister_hw(rt2x00dev->hw);
 752
 753         if (likely(rt2x00dev->hwmodes)) {
 754                 kfree(rt2x00dev->hwmodes->channels);
 755                 kfree(rt2x00dev->hwmodes->rates);
 756                 kfree(rt2x00dev->hwmodes);
 757                 rt2x00dev->hwmodes = NULL;
 758         }
 759 }
 760
 761 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 762 {
 763         struct hw_mode_spec *spec = &rt2x00dev->spec;
 764         int status;
 765
 766         /*
 767          * Initialize HW modes.
 768          */
 769         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 770         if (status)
 771                 return status;
 772
 773         /*
 774          * Register HW.
 775          */
 776         status = ieee80211_register_hw(rt2x00dev->hw);
 777         if (status) {
 778                 rt2x00lib_remove_hw(rt2x00dev);
 779                 return status;
 780         }
 781
 782         __set_bit(DEVICE_REGISTERED_HW, &rt2x00dev->flags);
 783
 784         return 0;
 785 }
 786
 787 /*
 788  * Initialization/uninitialization handlers.
 789  */
 790 static int rt2x00lib_alloc_entries(struct data_ring *ring,
 791                                    const u16 max_entries, const u16 data_size,
 792                                    const u16 desc_size)
 793 {
 794         struct data_entry *entry;
 795         unsigned int i;
 796
 797         ring->stats.limit = max_entries;
 798         ring->data_size = data_size;
 799         ring->desc_size = desc_size;
 800
 801         /*
 802          * Allocate all ring entries.
 803          */
 804         entry = kzalloc(ring->stats.limit * sizeof(*entry), GFP_KERNEL);
 805         if (!entry)
 806                 return -ENOMEM;
 807
 808         for (i = 0; i < ring->stats.limit; i++) {
 809                 entry[i].flags = 0;
 810                 entry[i].ring = ring;
 811                 entry[i].skb = NULL;
 812         }
 813
 814         ring->entry = entry;
 815
 816         return 0;
 817 }
 818
 819 static int rt2x00lib_alloc_ring_entries(struct rt2x00_dev *rt2x00dev)
 820 {
 821         struct data_ring *ring;
 822
 823         /*
 824          * Allocate the RX ring.
 825          */
 826         if (rt2x00lib_alloc_entries(rt2x00dev->rx, RX_ENTRIES, DATA_FRAME_SIZE,
 827                                     rt2x00dev->ops->rxd_size))
 828                 return -ENOMEM;
 829
 830         /*
 831          * First allocate the TX rings.
 832          */
 833         txring_for_each(rt2x00dev, ring) {
 834                 if (rt2x00lib_alloc_entries(ring, TX_ENTRIES, DATA_FRAME_SIZE,
 835                                             rt2x00dev->ops->txd_size))
 836                         return -ENOMEM;
 837         }
 838
 839         if (!test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
 840                 return 0;
 841
 842         /*
 843          * Allocate the BEACON ring.
 844          */
 845         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[0], BEACON_ENTRIES,
 846                                     MGMT_FRAME_SIZE, rt2x00dev->ops->txd_size))
 847                 return -ENOMEM;
 848
 849         /*
 850          * Allocate the Atim ring.
 851          */
 852         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[1], ATIM_ENTRIES,
 853                                     DATA_FRAME_SIZE, rt2x00dev->ops->txd_size))
 854                 return -ENOMEM;
 855
 856         return 0;
 857 }
 858
 859 static void rt2x00lib_free_ring_entries(struct rt2x00_dev *rt2x00dev)
 860 {
 861         struct data_ring *ring;
 862
 863         ring_for_each(rt2x00dev, ring) {
 864                 kfree(ring->entry);
 865                 ring->entry = NULL;
 866         }
 867 }
 868
 869 void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 870 {
 871         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 872                 return;
 873
 874         /*
 875          * Unregister rfkill.
 876          */
 877         rt2x00rfkill_unregister(rt2x00dev);
 878
 879         /*
 880          * Allow the HW to uninitialize.
 881          */
 882         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 883
 884         /*
 885          * Free allocated ring entries.
 886          */
 887         rt2x00lib_free_ring_entries(rt2x00dev);
 888 }
 889
 890 int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 891 {
 892         int status;
 893
 894         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 895                 return 0;
 896
 897         /*
 898          * Allocate all ring entries.
 899          */
 900         status = rt2x00lib_alloc_ring_entries(rt2x00dev);
 901         if (status) {
 902                 ERROR(rt2x00dev, "Ring entries allocation failed.\n");
 903                 return status;
 904         }
 905
 906         /*
 907          * Initialize the device.
 908          */
 909         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 910         if (status)
 911                 goto exit;
 912
 913         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
 914
 915         /*
 916          * Register the rfkill handler.
 917          */
 918         status = rt2x00rfkill_register(rt2x00dev);
 919         if (status)
 920                 goto exit_unitialize;
 921
 922         return 0;
 923
 924 exit_unitialize:
 925         rt2x00lib_uninitialize(rt2x00dev);
 926
 927 exit:
 928         rt2x00lib_free_ring_entries(rt2x00dev);
 929
 930         return status;
 931 }
 932
 933 /*
 934  * driver allocation handlers.
 935  */
 936 static int rt2x00lib_alloc_rings(struct rt2x00_dev *rt2x00dev)
 937 {
 938         struct data_ring *ring;
 939
 940         /*
 941          * We need the following rings:
 942          * RX: 1
 943          * TX: hw->queues
 944          * Beacon: 1 (if required)
 945          * Atim: 1 (if required)
 946          */
 947         rt2x00dev->data_rings = 1 + rt2x00dev->hw->queues +
 948             (2 * test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags));
 949
 950         ring = kzalloc(rt2x00dev->data_rings * sizeof(*ring), GFP_KERNEL);
 951         if (!ring) {
 952                 ERROR(rt2x00dev, "Ring allocation failed.\n");
 953                 return -ENOMEM;
 954         }
 955
 956         /*
 957          * Initialize pointers
 958          */
 959         rt2x00dev->rx = ring;
 960         rt2x00dev->tx = &rt2x00dev->rx[1];
 961         if (test_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags))
 962                 rt2x00dev->bcn = &rt2x00dev->tx[rt2x00dev->hw->queues];
 963
 964         /*
 965          * Initialize ring parameters.
 966          * cw_min: 2^5 = 32.
 967          * cw_max: 2^10 = 1024.
 968          */
 969         ring_for_each(rt2x00dev, ring) {
 970                 ring->rt2x00dev = rt2x00dev;
 971                 ring->tx_params.aifs = 2;
 972                 ring->tx_params.cw_min = 5;
 973                 ring->tx_params.cw_max = 10;
 974         }
 975
 976         return 0;
 977 }
 978
 979 static void rt2x00lib_free_rings(struct rt2x00_dev *rt2x00dev)
 980 {
 981         kfree(rt2x00dev->rx);
 982         rt2x00dev->rx = NULL;
 983         rt2x00dev->tx = NULL;
 984         rt2x00dev->bcn = NULL;
 985 }
 986
 987 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 988 {
 989         int retval = -ENOMEM;
 990
 991         /*
 992          * Let the driver probe the device to detect the capabilities.
 993          */
 994         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
 995         if (retval) {
 996                 ERROR(rt2x00dev, "Failed to allocate device.\n");
 997                 goto exit;
 998         }
 999
1000         /*
1001          * Initialize configuration work.
1002          */
1003         INIT_WORK(&rt2x00dev->beacon_work, rt2x00lib_beacondone_scheduled);
1004         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
1005         INIT_WORK(&rt2x00dev->config_work, rt2x00lib_configuration_scheduled);
1006         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
1007
1008         /*
1009          * Reset current working type.
1010          */
1011         rt2x00dev->interface.type = INVALID_INTERFACE;
1012
1013         /*
1014          * Allocate ring array.
1015          */
1016         retval = rt2x00lib_alloc_rings(rt2x00dev);
1017         if (retval)
1018                 goto exit;
1019
1020         /*
1021          * Initialize ieee80211 structure.
1022          */
1023         retval = rt2x00lib_probe_hw(rt2x00dev);
1024         if (retval) {
1025                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1026                 goto exit;
1027         }
1028
1029         /*
1030          * Allocatie rfkill.
1031          */
1032         retval = rt2x00rfkill_allocate(rt2x00dev);
1033         if (retval)
1034                 goto exit;
1035
1036         /*
1037          * Open the debugfs entry.
1038          */
1039         rt2x00debug_register(rt2x00dev);
1040
1041         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1042
1043         return 0;
1044
1045 exit:
1046         rt2x00lib_remove_dev(rt2x00dev);
1047
1048         return retval;
1049 }
1050 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1051
1052 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1053 {
1054         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1055
1056         /*
1057          * Disable radio.
1058          */
1059         rt2x00lib_disable_radio(rt2x00dev);
1060
1061         /*
1062          * Uninitialize device.
1063          */
1064         rt2x00lib_uninitialize(rt2x00dev);
1065
1066         /*
1067          * Close debugfs entry.
1068          */
1069         rt2x00debug_deregister(rt2x00dev);
1070
1071         /*
1072          * Free rfkill
1073          */
1074         rt2x00rfkill_free(rt2x00dev);
1075
1076         /*
1077          * Free ieee80211_hw memory.
1078          */
1079         rt2x00lib_remove_hw(rt2x00dev);
1080
1081         /*
1082          * Free firmware image.
1083          */
1084         rt2x00lib_free_firmware(rt2x00dev);
1085
1086         /*
1087          * Free ring structures.
1088          */
1089         rt2x00lib_free_rings(rt2x00dev);
1090 }
1091 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1092
1093 /*
1094  * Device state handlers
1095  */
1096 #ifdef CONFIG_PM
1097 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1098 {
1099         int retval;
1100
1101         NOTICE(rt2x00dev, "Going to sleep.\n");
1102         __clear_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1103
1104         /*
1105          * Only continue if mac80211 has open interfaces.
1106          */
1107         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
1108                 goto exit;
1109         __set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
1110
1111         /*
1112          * Disable radio and unitialize all items
1113          * that must be recreated on resume.
1114          */
1115         rt2x00mac_stop(rt2x00dev->hw);
1116         rt2x00lib_uninitialize(rt2x00dev);
1117         rt2x00debug_deregister(rt2x00dev);
1118
1119 exit:
1120         /*
1121          * Set device mode to sleep for power management.
1122          */
1123         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1124         if (retval)
1125                 return retval;
1126
1127         return 0;
1128 }
1129 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1130
1131 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1132 {
1133         struct interface *intf = &rt2x00dev->interface;
1134         int retval;
1135
1136         NOTICE(rt2x00dev, "Waking up.\n");
1137         __set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
1138
1139         /*
1140          * Open the debugfs entry.
1141          */
1142         rt2x00debug_register(rt2x00dev);
1143
1144         /*
1145          * Only continue if mac80211 had open interfaces.
1146          */
1147         if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags))
1148                 return 0;
1149
1150         /*
1151          * Reinitialize device and all active interfaces.
1152          */
1153         retval = rt2x00mac_start(rt2x00dev->hw);
1154         if (retval)
1155                 goto exit;
1156
1157         /*
1158          * Reconfigure device.
1159          */
1160         rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf, 1);
1161         if (!rt2x00dev->hw->conf.radio_enabled)
1162                 rt2x00lib_disable_radio(rt2x00dev);
1163
1164         rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
1165         rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
1166         rt2x00lib_config_type(rt2x00dev, intf->type);
1167
1168         /*
1169          * It is possible that during that mac80211 has attempted
1170          * to send frames while we were suspending or resuming.
1171          * In that case we have disabled the TX queue and should
1172          * now enable it again
1173          */
1174         ieee80211_start_queues(rt2x00dev->hw);
1175
1176         /*
1177          * When in Master or Ad-hoc mode,
1178          * restart Beacon transmitting by faking a beacondone event.
1179          */
1180         if (intf->type == IEEE80211_IF_TYPE_AP ||
1181             intf->type == IEEE80211_IF_TYPE_IBSS)
1182                 rt2x00lib_beacondone(rt2x00dev);
1183
1184         return 0;
1185
1186 exit:
1187         rt2x00lib_disable_radio(rt2x00dev);
1188         rt2x00lib_uninitialize(rt2x00dev);
1189         rt2x00debug_deregister(rt2x00dev);
1190
1191         return retval;
1192 }
1193 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1194 #endif /* CONFIG_PM */
1195
1196 /*
1197  * rt2x00lib module information.
1198  */
1199 MODULE_AUTHOR(DRV_PROJECT);
1200 MODULE_VERSION(DRV_VERSION);
1201 MODULE_DESCRIPTION("rt2x00 library");
1202 MODULE_LICENSE("GPL");