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 /*
  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(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         if (delayed_work_pending(&rt2x00dev->link.work))
  84                 cancel_rearming_delayed_work(&rt2x00dev->link.work);
  85 }
  86
  87 void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
  88 {
  89         rt2x00lib_stop_link_tuner(rt2x00dev);
  90         rt2x00lib_start_link_tuner(rt2x00dev);
  91 }
  92
  93 /*
  94  * Radio control handlers.
  95  */
  96 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  97 {
  98         int status;
  99
 100         /*
 101          * Don't enable the radio twice.
 102          * And check if the hardware button has been disabled.
 103          */
 104         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 105             (test_bit(DEVICE_SUPPORT_HW_BUTTON, &rt2x00dev->flags) &&
 106              !test_bit(DEVICE_ENABLED_RADIO_HW, &rt2x00dev->flags)))
 107                 return 0;
 108
 109         /*
 110          * Enable radio.
 111          */
 112         status = rt2x00dev->ops->lib->set_device_state(rt2x00dev,
 113                                                        STATE_RADIO_ON);
 114         if (status)
 115                 return status;
 116
 117         __set_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags);
 118
 119         /*
 120          * Enable RX.
 121          */
 122         rt2x00lib_toggle_rx(rt2x00dev, 1);
 123
 124         /*
 125          * Start the TX queues.
 126          */
 127         ieee80211_start_queues(rt2x00dev->hw);
 128
 129         return 0;
 130 }
 131
 132 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
 133 {
 134         if (!__test_and_clear_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 135                 return;
 136
 137         /*
 138          * Stop beacon generation.
 139          */
 140         if (work_pending(&rt2x00dev->beacon_work))
 141                 cancel_work_sync(&rt2x00dev->beacon_work);
 142
 143         /*
 144          * Stop the TX queues.
 145          */
 146         ieee80211_stop_queues(rt2x00dev->hw);
 147
 148         /*
 149          * Disable RX.
 150          */
 151         rt2x00lib_toggle_rx(rt2x00dev, 0);
 152
 153         /*
 154          * Disable radio.
 155          */
 156         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 157 }
 158
 159 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, int enable)
 160 {
 161         enum dev_state state = enable ? STATE_RADIO_RX_ON : STATE_RADIO_RX_OFF;
 162
 163         /*
 164          * When we are disabling the RX, we should also stop the link tuner.
 165          */
 166         if (!enable)
 167                 rt2x00lib_stop_link_tuner(rt2x00dev);
 168
 169         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 170
 171         /*
 172          * When we are enabling the RX, we should also start the link tuner.
 173          */
 174         if (enable && is_interface_present(&rt2x00dev->interface))
 175                 rt2x00lib_start_link_tuner(rt2x00dev);
 176 }
 177
 178 static void rt2x00lib_precalculate_link_signal(struct link *link)
 179 {
 180         if (link->rx_failed || link->rx_success)
 181                 link->rx_percentage =
 182                     (link->rx_success * 100) /
 183                     (link->rx_failed + link->rx_success);
 184         else
 185                 link->rx_percentage = 50;
 186
 187         if (link->tx_failed || link->tx_success)
 188                 link->tx_percentage =
 189                     (link->tx_success * 100) /
 190                     (link->tx_failed + link->tx_success);
 191         else
 192                 link->tx_percentage = 50;
 193
 194         link->rx_success = 0;
 195         link->rx_failed = 0;
 196         link->tx_success = 0;
 197         link->tx_failed = 0;
 198 }
 199
 200 static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
 201                                            int rssi)
 202 {
 203         int rssi_percentage = 0;
 204         int signal;
 205
 206         /*
 207          * We need a positive value for the RSSI.
 208          */
 209         if (rssi < 0)
 210                 rssi += rt2x00dev->rssi_offset;
 211
 212         /*
 213          * Calculate the different percentages,
 214          * which will be used for the signal.
 215          */
 216         if (rt2x00dev->rssi_offset)
 217                 rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
 218
 219         /*
 220          * Add the individual percentages and use the WEIGHT
 221          * defines to calculate the current link signal.
 222          */
 223         signal = ((WEIGHT_RSSI * rssi_percentage) +
 224                   (WEIGHT_TX * rt2x00dev->link.tx_percentage) +
 225                   (WEIGHT_RX * rt2x00dev->link.rx_percentage)) / 100;
 226
 227         return (signal > 100) ? 100 : signal;
 228 }
 229
 230 static void rt2x00lib_link_tuner(struct work_struct *work)
 231 {
 232         struct rt2x00_dev *rt2x00dev =
 233             container_of(work, struct rt2x00_dev, link.work.work);
 234
 235         /*
 236          * Update statistics.
 237          */
 238         rt2x00dev->ops->lib->link_stats(rt2x00dev);
 239
 240         rt2x00dev->low_level_stats.dot11FCSErrorCount +=
 241             rt2x00dev->link.rx_failed;
 242
 243         rt2x00lib_precalculate_link_signal(&rt2x00dev->link);
 244
 245         /*
 246          * Only perform the link tuning when Link tuning
 247          * has been enabled (This could have been disabled from the EEPROM).
 248          */
 249         if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
 250                 rt2x00dev->ops->lib->link_tuner(rt2x00dev);
 251
 252         /*
 253          * Increase tuner counter, and reschedule the next link tuner run.
 254          */
 255         rt2x00dev->link.count++;
 256         queue_delayed_work(rt2x00dev->hw->workqueue, &rt2x00dev->link.work,
 257                            LINK_TUNE_INTERVAL);
 258 }
 259
 260 /*
 261  * Interrupt context handlers.
 262  */
 263 static void rt2x00lib_beacondone_scheduled(struct work_struct *work)
 264 {
 265         struct rt2x00_dev *rt2x00dev =
 266             container_of(work, struct rt2x00_dev, beacon_work);
 267         struct data_ring *ring =
 268             rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
 269         struct data_entry *entry = rt2x00_get_data_entry(ring);
 270         struct sk_buff *skb;
 271
 272         skb = ieee80211_beacon_get(rt2x00dev->hw,
 273                                    rt2x00dev->interface.id,
 274                                    &entry->tx_status.control);
 275         if (!skb)
 276                 return;
 277
 278         rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, skb,
 279                                           &entry->tx_status.control);
 280
 281         dev_kfree_skb(skb);
 282 }
 283
 284 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 285 {
 286         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 287                 return;
 288
 289         queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->beacon_work);
 290 }
 291 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 292
 293 void rt2x00lib_txdone(struct data_entry *entry,
 294                       const int status, const int retry)
 295 {
 296         struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
 297         struct ieee80211_tx_status *tx_status = &entry->tx_status;
 298         struct ieee80211_low_level_stats *stats = &rt2x00dev->low_level_stats;
 299         int success = !!(status == TX_SUCCESS || status == TX_SUCCESS_RETRY);
 300         int fail = !!(status == TX_FAIL_RETRY || status == TX_FAIL_INVALID ||
 301                       status == TX_FAIL_OTHER);
 302
 303         /*
 304          * Update TX statistics.
 305          */
 306         tx_status->flags = 0;
 307         tx_status->ack_signal = 0;
 308         tx_status->excessive_retries = (status == TX_FAIL_RETRY);
 309         tx_status->retry_count = retry;
 310         rt2x00dev->link.tx_success += success;
 311         rt2x00dev->link.tx_failed += retry + fail;
 312
 313         if (!(tx_status->control.flags & IEEE80211_TXCTL_NO_ACK)) {
 314                 if (success)
 315                         tx_status->flags |= IEEE80211_TX_STATUS_ACK;
 316                 else
 317                         stats->dot11ACKFailureCount++;
 318         }
 319
 320         tx_status->queue_length = entry->ring->stats.limit;
 321         tx_status->queue_number = tx_status->control.queue;
 322
 323         if (tx_status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) {
 324                 if (success)
 325                         stats->dot11RTSSuccessCount++;
 326                 else
 327                         stats->dot11RTSFailureCount++;
 328         }
 329
 330         /*
 331          * Send the tx_status to mac80211,
 332          * that method also cleans up the skb structure.
 333          */
 334         ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb, tx_status);
 335         entry->skb = NULL;
 336 }
 337 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 338
 339 void rt2x00lib_rxdone(struct data_entry *entry, struct sk_buff *skb,
 340                       const int signal, const int rssi, const int ofdm)
 341 {
 342         struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
 343         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 344         struct ieee80211_hw_mode *mode;
 345         struct ieee80211_rate *rate;
 346         unsigned int i;
 347         int val = 0;
 348
 349         /*
 350          * Update RX statistics.
 351          */
 352         mode = &rt2x00dev->hwmodes[rt2x00dev->curr_hwmode];
 353         for (i = 0; i < mode->num_rates; i++) {
 354                 rate = &mode->rates[i];
 355
 356                 /*
 357                  * When frame was received with an OFDM bitrate,
 358                  * the signal is the PLCP value. If it was received with
 359                  * a CCK bitrate the signal is the rate in 0.5kbit/s.
 360                  */
 361                 if (!ofdm)
 362                         val = DEVICE_GET_RATE_FIELD(rate->val, RATE);
 363                 else
 364                         val = DEVICE_GET_RATE_FIELD(rate->val, PLCP);
 365
 366                 if (val == signal) {
 367                         val = rate->val;
 368                         break;
 369                 }
 370         }
 371
 372         rt2x00_update_link_rssi(&rt2x00dev->link, rssi);
 373         rt2x00dev->link.rx_success++;
 374         rx_status->rate = val;
 375         rx_status->signal = rt2x00lib_calculate_link_signal(rt2x00dev, rssi);
 376         rx_status->ssi = rssi;
 377
 378         /*
 379          * Send frame to mac80211
 380          */
 381         ieee80211_rx_irqsafe(rt2x00dev->hw, skb, rx_status);
 382 }
 383 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 384
 385 /*
 386  * TX descriptor initializer
 387  */
 388 void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 389                              struct data_desc *txd,
 390                              struct ieee80211_hdr *ieee80211hdr,
 391                              unsigned int length,
 392                              struct ieee80211_tx_control *control)
 393 {
 394         struct data_entry_desc desc;
 395         struct data_ring *ring;
 396         int tx_rate;
 397         int bitrate;
 398         int duration;
 399         int residual;
 400         u16 frame_control;
 401         u16 seq_ctrl;
 402
 403         /*
 404          * Make sure the descriptor is properly cleared.
 405          */
 406         memset(&desc, 0x00, sizeof(desc));
 407
 408         /*
 409          * Get ring pointer, if we fail to obtain the
 410          * correct ring, then use the first TX ring.
 411          */
 412         ring = rt2x00lib_get_ring(rt2x00dev, control->queue);
 413         if (!ring)
 414                 ring = rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_DATA0);
 415
 416         desc.cw_min = ring->tx_params.cw_min;
 417         desc.cw_max = ring->tx_params.cw_max;
 418         desc.aifs = ring->tx_params.aifs;
 419
 420         /*
 421          * Identify queue
 422          */
 423         if (control->queue < rt2x00dev->hw->queues)
 424                 desc.queue = control->queue;
 425         else if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 426                  control->queue == IEEE80211_TX_QUEUE_AFTER_BEACON)
 427                 desc.queue = QUEUE_MGMT;
 428         else
 429                 desc.queue = QUEUE_OTHER;
 430
 431         /*
 432          * Read required fields from ieee80211 header.
 433          */
 434         frame_control = le16_to_cpu(ieee80211hdr->frame_control);
 435         seq_ctrl = le16_to_cpu(ieee80211hdr->seq_ctrl);
 436
 437         tx_rate = control->tx_rate;
 438
 439         /*
 440          * Check if this is a RTS/CTS frame
 441          */
 442         if (is_rts_frame(frame_control) || is_cts_frame(frame_control)) {
 443                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 444                 if (is_rts_frame(frame_control))
 445                         __set_bit(ENTRY_TXD_RTS_FRAME, &desc.flags);
 446                 if (control->rts_cts_rate)
 447                         tx_rate = control->rts_cts_rate;
 448         }
 449
 450         /*
 451          * Check for OFDM
 452          */
 453         if (DEVICE_GET_RATE_FIELD(tx_rate, RATEMASK) & DEV_OFDM_RATEMASK)
 454                 __set_bit(ENTRY_TXD_OFDM_RATE, &desc.flags);
 455
 456         /*
 457          * Check if more fragments are pending
 458          */
 459         if (ieee80211_get_morefrag(ieee80211hdr)) {
 460                 __set_bit(ENTRY_TXD_BURST, &desc.flags);
 461                 __set_bit(ENTRY_TXD_MORE_FRAG, &desc.flags);
 462         }
 463
 464         /*
 465          * Beacons and probe responses require the tsf timestamp
 466          * to be inserted into the frame.
 467          */
 468         if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
 469             is_probe_resp(frame_control))
 470                 __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &desc.flags);
 471
 472         /*
 473          * Determine with what IFS priority this frame should be send.
 474          * Set ifs to IFS_SIFS when the this is not the first fragment,
 475          * or this fragment came after RTS/CTS.
 476          */
 477         if ((seq_ctrl & IEEE80211_SCTL_FRAG) > 0 ||
 478             test_bit(ENTRY_TXD_RTS_FRAME, &desc.flags))
 479                 desc.ifs = IFS_SIFS;
 480         else
 481                 desc.ifs = IFS_BACKOFF;
 482
 483         /*
 484          * PLCP setup
 485          * Length calculation depends on OFDM/CCK rate.
 486          */
 487         desc.signal = DEVICE_GET_RATE_FIELD(tx_rate, PLCP);
 488         desc.service = 0x04;
 489
 490         if (test_bit(ENTRY_TXD_OFDM_RATE, &desc.flags)) {
 491                 desc.length_high = ((length + FCS_LEN) >> 6) & 0x3f;
 492                 desc.length_low = ((length + FCS_LEN) & 0x3f);
 493         } else {
 494                 bitrate = DEVICE_GET_RATE_FIELD(tx_rate, RATE);
 495
 496                 /*
 497                  * Convert length to microseconds.
 498                  */
 499                 residual = get_duration_res(length + FCS_LEN, bitrate);
 500                 duration = get_duration(length + FCS_LEN, bitrate);
 501
 502                 if (residual != 0) {
 503                         duration++;
 504
 505                         /*
 506                          * Check if we need to set the Length Extension
 507                          */
 508                         if (bitrate == 110 && residual <= 3)
 509                                 desc.service |= 0x80;
 510                 }
 511
 512                 desc.length_high = (duration >> 8) & 0xff;
 513                 desc.length_low = duration & 0xff;
 514
 515                 /*
 516                  * When preamble is enabled we should set the
 517                  * preamble bit for the signal.
 518                  */
 519                 if (DEVICE_GET_RATE_FIELD(tx_rate, PREAMBLE))
 520                         desc.signal |= 0x08;
 521         }
 522
 523         rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, txd, &desc,
 524                                            ieee80211hdr, length, control);
 525 }
 526 EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc);
 527
 528 /*
 529  * Driver initialization handlers.
 530  */
 531 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 532                               const int channel, const int tx_power,
 533                               const int value)
 534 {
 535         entry->chan = channel;
 536         if (channel <= 14)
 537                 entry->freq = 2407 + (5 * channel);
 538         else
 539                 entry->freq = 5000 + (5 * channel);
 540         entry->val = value;
 541         entry->flag =
 542             IEEE80211_CHAN_W_IBSS |
 543             IEEE80211_CHAN_W_ACTIVE_SCAN |
 544             IEEE80211_CHAN_W_SCAN;
 545         entry->power_level = tx_power;
 546         entry->antenna_max = 0xff;
 547 }
 548
 549 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 550                            const int rate, const int mask,
 551                            const int plcp, const int flags)
 552 {
 553         entry->rate = rate;
 554         entry->val =
 555             DEVICE_SET_RATE_FIELD(rate, RATE) |
 556             DEVICE_SET_RATE_FIELD(mask, RATEMASK) |
 557             DEVICE_SET_RATE_FIELD(plcp, PLCP);
 558         entry->flags = flags;
 559         entry->val2 = entry->val;
 560         if (entry->flags & IEEE80211_RATE_PREAMBLE2)
 561                 entry->val2 |= DEVICE_SET_RATE_FIELD(1, PREAMBLE);
 562         entry->min_rssi_ack = 0;
 563         entry->min_rssi_ack_delta = 0;
 564 }
 565
 566 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 567                                     struct hw_mode_spec *spec)
 568 {
 569         struct ieee80211_hw *hw = rt2x00dev->hw;
 570         struct ieee80211_hw_mode *hwmodes;
 571         struct ieee80211_channel *channels;
 572         struct ieee80211_rate *rates;
 573         unsigned int i;
 574         unsigned char tx_power;
 575
 576         hwmodes = kzalloc(sizeof(*hwmodes) * spec->num_modes, GFP_KERNEL);
 577         if (!hwmodes)
 578                 goto exit;
 579
 580         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 581         if (!channels)
 582                 goto exit_free_modes;
 583
 584         rates = kzalloc(sizeof(*rates) * spec->num_rates, GFP_KERNEL);
 585         if (!rates)
 586                 goto exit_free_channels;
 587
 588         /*
 589          * Initialize Rate list.
 590          */
 591         rt2x00lib_rate(&rates[0], 10, DEV_RATEMASK_1MB,
 592                        0x00, IEEE80211_RATE_CCK);
 593         rt2x00lib_rate(&rates[1], 20, DEV_RATEMASK_2MB,
 594                        0x01, IEEE80211_RATE_CCK_2);
 595         rt2x00lib_rate(&rates[2], 55, DEV_RATEMASK_5_5MB,
 596                        0x02, IEEE80211_RATE_CCK_2);
 597         rt2x00lib_rate(&rates[3], 110, DEV_RATEMASK_11MB,
 598                        0x03, IEEE80211_RATE_CCK_2);
 599
 600         if (spec->num_rates > 4) {
 601                 rt2x00lib_rate(&rates[4], 60, DEV_RATEMASK_6MB,
 602                                0x0b, IEEE80211_RATE_OFDM);
 603                 rt2x00lib_rate(&rates[5], 90, DEV_RATEMASK_9MB,
 604                                0x0f, IEEE80211_RATE_OFDM);
 605                 rt2x00lib_rate(&rates[6], 120, DEV_RATEMASK_12MB,
 606                                0x0a, IEEE80211_RATE_OFDM);
 607                 rt2x00lib_rate(&rates[7], 180, DEV_RATEMASK_18MB,
 608                                0x0e, IEEE80211_RATE_OFDM);
 609                 rt2x00lib_rate(&rates[8], 240, DEV_RATEMASK_24MB,
 610                                0x09, IEEE80211_RATE_OFDM);
 611                 rt2x00lib_rate(&rates[9], 360, DEV_RATEMASK_36MB,
 612                                0x0d, IEEE80211_RATE_OFDM);
 613                 rt2x00lib_rate(&rates[10], 480, DEV_RATEMASK_48MB,
 614                                0x08, IEEE80211_RATE_OFDM);
 615                 rt2x00lib_rate(&rates[11], 540, DEV_RATEMASK_54MB,
 616                                0x0c, IEEE80211_RATE_OFDM);
 617         }
 618
 619         /*
 620          * Initialize Channel list.
 621          */
 622         for (i = 0; i < spec->num_channels; i++) {
 623                 if (spec->channels[i].channel <= 14)
 624                         tx_power = spec->tx_power_bg[i];
 625                 else if (spec->tx_power_a)
 626                         tx_power = spec->tx_power_a[i];
 627                 else
 628                         tx_power = spec->tx_power_default;
 629
 630                 rt2x00lib_channel(&channels[i],
 631                                   spec->channels[i].channel, tx_power, i);
 632         }
 633
 634         /*
 635          * Intitialize 802.11b
 636          * Rates: CCK.
 637          * Channels: OFDM.
 638          */
 639         if (spec->num_modes > HWMODE_B) {
 640                 hwmodes[HWMODE_B].mode = MODE_IEEE80211B;
 641                 hwmodes[HWMODE_B].num_channels = 14;
 642                 hwmodes[HWMODE_B].num_rates = 4;
 643                 hwmodes[HWMODE_B].channels = channels;
 644                 hwmodes[HWMODE_B].rates = rates;
 645         }
 646
 647         /*
 648          * Intitialize 802.11g
 649          * Rates: CCK, OFDM.
 650          * Channels: OFDM.
 651          */
 652         if (spec->num_modes > HWMODE_G) {
 653                 hwmodes[HWMODE_G].mode = MODE_IEEE80211G;
 654                 hwmodes[HWMODE_G].num_channels = 14;
 655                 hwmodes[HWMODE_G].num_rates = spec->num_rates;
 656                 hwmodes[HWMODE_G].channels = channels;
 657                 hwmodes[HWMODE_G].rates = rates;
 658         }
 659
 660         /*
 661          * Intitialize 802.11a
 662          * Rates: OFDM.
 663          * Channels: OFDM, UNII, HiperLAN2.
 664          */
 665         if (spec->num_modes > HWMODE_A) {
 666                 hwmodes[HWMODE_A].mode = MODE_IEEE80211A;
 667                 hwmodes[HWMODE_A].num_channels = spec->num_channels - 14;
 668                 hwmodes[HWMODE_A].num_rates = spec->num_rates - 4;
 669                 hwmodes[HWMODE_A].channels = &channels[14];
 670                 hwmodes[HWMODE_A].rates = &rates[4];
 671         }
 672
 673         if (spec->num_modes > HWMODE_G &&
 674             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_G]))
 675                 goto exit_free_rates;
 676
 677         if (spec->num_modes > HWMODE_B &&
 678             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_B]))
 679                 goto exit_free_rates;
 680
 681         if (spec->num_modes > HWMODE_A &&
 682             ieee80211_register_hwmode(hw, &hwmodes[HWMODE_A]))
 683                 goto exit_free_rates;
 684
 685         rt2x00dev->hwmodes = hwmodes;
 686
 687         return 0;
 688
 689 exit_free_rates:
 690         kfree(rates);
 691
 692 exit_free_channels:
 693         kfree(channels);
 694
 695 exit_free_modes:
 696         kfree(hwmodes);
 697
 698 exit:
 699         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 700         return -ENOMEM;
 701 }
 702
 703 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 704 {
 705         if (test_bit(DEVICE_INITIALIZED_HW, &rt2x00dev->flags))
 706                 ieee80211_unregister_hw(rt2x00dev->hw);
 707
 708         if (likely(rt2x00dev->hwmodes)) {
 709                 kfree(rt2x00dev->hwmodes->channels);
 710                 kfree(rt2x00dev->hwmodes->rates);
 711                 kfree(rt2x00dev->hwmodes);
 712                 rt2x00dev->hwmodes = NULL;
 713         }
 714 }
 715
 716 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 717 {
 718         struct hw_mode_spec *spec = &rt2x00dev->spec;
 719         int status;
 720
 721         /*
 722          * Initialize HW modes.
 723          */
 724         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 725         if (status)
 726                 return status;
 727
 728         /*
 729          * Register HW.
 730          */
 731         status = ieee80211_register_hw(rt2x00dev->hw);
 732         if (status) {
 733                 rt2x00lib_remove_hw(rt2x00dev);
 734                 return status;
 735         }
 736
 737         __set_bit(DEVICE_INITIALIZED_HW, &rt2x00dev->flags);
 738
 739         return 0;
 740 }
 741
 742 /*
 743  * Initialization/uninitialization handlers.
 744  */
 745 static int rt2x00lib_alloc_entries(struct data_ring *ring,
 746                                    const u16 max_entries, const u16 data_size,
 747                                    const u16 desc_size)
 748 {
 749         struct data_entry *entry;
 750         unsigned int i;
 751
 752         ring->stats.limit = max_entries;
 753         ring->data_size = data_size;
 754         ring->desc_size = desc_size;
 755
 756         /*
 757          * Allocate all ring entries.
 758          */
 759         entry = kzalloc(ring->stats.limit * sizeof(*entry), GFP_KERNEL);
 760         if (!entry)
 761                 return -ENOMEM;
 762
 763         for (i = 0; i < ring->stats.limit; i++) {
 764                 entry[i].flags = 0;
 765                 entry[i].ring = ring;
 766                 entry[i].skb = NULL;
 767         }
 768
 769         ring->entry = entry;
 770
 771         return 0;
 772 }
 773
 774 static int rt2x00lib_alloc_ring_entries(struct rt2x00_dev *rt2x00dev)
 775 {
 776         struct data_ring *ring;
 777
 778         /*
 779          * Allocate the RX ring.
 780          */
 781         if (rt2x00lib_alloc_entries(rt2x00dev->rx, RX_ENTRIES, DATA_FRAME_SIZE,
 782                                     rt2x00dev->ops->rxd_size))
 783                 return -ENOMEM;
 784
 785         /*
 786          * First allocate the TX rings.
 787          */
 788         txring_for_each(rt2x00dev, ring) {
 789                 if (rt2x00lib_alloc_entries(ring, TX_ENTRIES, DATA_FRAME_SIZE,
 790                                             rt2x00dev->ops->txd_size))
 791                         return -ENOMEM;
 792         }
 793
 794         if (!test_bit(REQUIRE_BEACON_RING, &rt2x00dev->flags))
 795                 return 0;
 796
 797         /*
 798          * Allocate the BEACON ring.
 799          */
 800         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[0], BEACON_ENTRIES,
 801                                     MGMT_FRAME_SIZE, rt2x00dev->ops->txd_size))
 802                 return -ENOMEM;
 803
 804         /*
 805          * Allocate the Atim ring.
 806          */
 807         if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[1], ATIM_ENTRIES,
 808                                     DATA_FRAME_SIZE, rt2x00dev->ops->txd_size))
 809                 return -ENOMEM;
 810
 811         return 0;
 812 }
 813
 814 static void rt2x00lib_free_ring_entries(struct rt2x00_dev *rt2x00dev)
 815 {
 816         struct data_ring *ring;
 817
 818         ring_for_each(rt2x00dev, ring) {
 819                 kfree(ring->entry);
 820                 ring->entry = NULL;
 821         }
 822 }
 823
 824 void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 825 {
 826         if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 827                 return;
 828
 829         /*
 830          * Unregister rfkill.
 831          */
 832         rt2x00rfkill_unregister(rt2x00dev);
 833
 834         /*
 835          * Allow the HW to uninitialize.
 836          */
 837         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 838
 839         /*
 840          * Free allocated ring entries.
 841          */
 842         rt2x00lib_free_ring_entries(rt2x00dev);
 843 }
 844
 845 int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 846 {
 847         int status;
 848
 849         if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
 850                 return 0;
 851
 852         /*
 853          * Allocate all ring entries.
 854          */
 855         status = rt2x00lib_alloc_ring_entries(rt2x00dev);
 856         if (status) {
 857                 ERROR(rt2x00dev, "Ring entries allocation failed.\n");
 858                 return status;
 859         }
 860
 861         /*
 862          * Initialize the device.
 863          */
 864         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 865         if (status)
 866                 goto exit;
 867
 868         __set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
 869
 870         /*
 871          * Register the rfkill handler.
 872          */
 873         status = rt2x00rfkill_register(rt2x00dev);
 874         if (status)
 875                 goto exit_unitialize;
 876
 877         return 0;
 878
 879 exit_unitialize:
 880         rt2x00lib_uninitialize(rt2x00dev);
 881
 882 exit:
 883         rt2x00lib_free_ring_entries(rt2x00dev);
 884
 885         return status;
 886 }
 887
 888 /*
 889  * driver allocation handlers.
 890  */
 891 static int rt2x00lib_alloc_rings(struct rt2x00_dev *rt2x00dev)
 892 {
 893         struct data_ring *ring;
 894
 895         /*
 896          * We need the following rings:
 897          * RX: 1
 898          * TX: hw->queues
 899          * Beacon: 1 (if required)
 900          * Atim: 1 (if required)
 901          */
 902         rt2x00dev->data_rings = 1 + rt2x00dev->hw->queues +
 903             (2 * test_bit(REQUIRE_BEACON_RING, &rt2x00dev->flags));
 904
 905         ring = kzalloc(rt2x00dev->data_rings * sizeof(*ring), GFP_KERNEL);
 906         if (!ring) {
 907                 ERROR(rt2x00dev, "Ring allocation failed.\n");
 908                 return -ENOMEM;
 909         }
 910
 911         /*
 912          * Initialize pointers
 913          */
 914         rt2x00dev->rx = ring;
 915         rt2x00dev->tx = &rt2x00dev->rx[1];
 916         if (test_bit(REQUIRE_BEACON_RING, &rt2x00dev->flags))
 917                 rt2x00dev->bcn = &rt2x00dev->tx[rt2x00dev->hw->queues];
 918
 919         /*
 920          * Initialize ring parameters.
 921          * cw_min: 2^5 = 32.
 922          * cw_max: 2^10 = 1024.
 923          */
 924         ring_for_each(rt2x00dev, ring) {
 925                 ring->rt2x00dev = rt2x00dev;
 926                 ring->tx_params.aifs = 2;
 927                 ring->tx_params.cw_min = 5;
 928                 ring->tx_params.cw_max = 10;
 929         }
 930
 931         return 0;
 932 }
 933
 934 static void rt2x00lib_free_rings(struct rt2x00_dev *rt2x00dev)
 935 {
 936         kfree(rt2x00dev->rx);
 937         rt2x00dev->rx = NULL;
 938         rt2x00dev->tx = NULL;
 939         rt2x00dev->bcn = NULL;
 940 }
 941
 942 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 943 {
 944         int retval = -ENOMEM;
 945
 946         /*
 947          * Let the driver probe the device to detect the capabilities.
 948          */
 949         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
 950         if (retval) {
 951                 ERROR(rt2x00dev, "Failed to allocate device.\n");
 952                 goto exit;
 953         }
 954
 955         /*
 956          * Initialize configuration work.
 957          */
 958         INIT_WORK(&rt2x00dev->beacon_work, rt2x00lib_beacondone_scheduled);
 959         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
 960
 961         /*
 962          * Reset current working type.
 963          */
 964         rt2x00dev->interface.type = INVALID_INTERFACE;
 965
 966         /*
 967          * Allocate ring array.
 968          */
 969         retval = rt2x00lib_alloc_rings(rt2x00dev);
 970         if (retval)
 971                 goto exit;
 972
 973         /*
 974          * Initialize ieee80211 structure.
 975          */
 976         retval = rt2x00lib_probe_hw(rt2x00dev);
 977         if (retval) {
 978                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
 979                 goto exit;
 980         }
 981
 982         /*
 983          * Allocatie rfkill.
 984          */
 985         retval = rt2x00rfkill_allocate(rt2x00dev);
 986         if (retval)
 987                 goto exit;
 988
 989         /*
 990          * Open the debugfs entry.
 991          */
 992         rt2x00debug_register(rt2x00dev);
 993
 994         return 0;
 995
 996 exit:
 997         rt2x00lib_remove_dev(rt2x00dev);
 998
 999         return retval;
1000 }
1001 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1002
1003 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1004 {
1005         /*
1006          * Disable radio.
1007          */
1008         rt2x00lib_disable_radio(rt2x00dev);
1009
1010         /*
1011          * Uninitialize device.
1012          */
1013         rt2x00lib_uninitialize(rt2x00dev);
1014
1015         /*
1016          * Close debugfs entry.
1017          */
1018         rt2x00debug_deregister(rt2x00dev);
1019
1020         /*
1021          * Free rfkill
1022          */
1023         rt2x00rfkill_free(rt2x00dev);
1024
1025         /*
1026          * Free ieee80211_hw memory.
1027          */
1028         rt2x00lib_remove_hw(rt2x00dev);
1029
1030         /*
1031          * Free firmware image.
1032          */
1033         rt2x00lib_free_firmware(rt2x00dev);
1034
1035         /*
1036          * Free ring structures.
1037          */
1038         rt2x00lib_free_rings(rt2x00dev);
1039 }
1040 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1041
1042 /*
1043  * Device state handlers
1044  */
1045 #ifdef CONFIG_PM
1046 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1047 {
1048         int retval;
1049
1050         NOTICE(rt2x00dev, "Going to sleep.\n");
1051
1052         /*
1053          * Disable radio and unitialize all items
1054          * that must be recreated on resume.
1055          */
1056         rt2x00lib_disable_radio(rt2x00dev);
1057         rt2x00lib_uninitialize(rt2x00dev);
1058         rt2x00debug_deregister(rt2x00dev);
1059
1060         /*
1061          * Set device mode to sleep for power management.
1062          */
1063         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
1064         if (retval)
1065                 return retval;
1066
1067         return 0;
1068 }
1069 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1070
1071 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1072 {
1073         struct interface *intf = &rt2x00dev->interface;
1074         int retval;
1075
1076         NOTICE(rt2x00dev, "Waking up.\n");
1077         __set_bit(INTERFACE_RESUME, &rt2x00dev->flags);
1078
1079         /*
1080          * Open the debugfs entry.
1081          */
1082         rt2x00debug_register(rt2x00dev);
1083
1084         /*
1085          * Reinitialize device and all active interfaces.
1086          */
1087         retval = rt2x00mac_start(rt2x00dev->hw);
1088         if (retval)
1089                 goto exit;
1090
1091         /*
1092          * Reconfigure device.
1093          */
1094         retval = rt2x00mac_config(rt2x00dev->hw, &rt2x00dev->hw->conf);
1095         if (retval)
1096                 goto exit;
1097
1098         rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
1099         rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
1100         rt2x00lib_config_type(rt2x00dev, intf->type);
1101         rt2x00lib_config_packet_filter(rt2x00dev, intf->filter);
1102
1103         /*
1104          * When in Master or Ad-hoc mode,
1105          * restart Beacon transmitting by faking a beacondone event.
1106          */
1107         if (intf->type == IEEE80211_IF_TYPE_AP ||
1108             intf->type == IEEE80211_IF_TYPE_IBSS)
1109                 rt2x00lib_beacondone(rt2x00dev);
1110
1111         __clear_bit(INTERFACE_RESUME, &rt2x00dev->flags);
1112
1113         return 0;
1114
1115 exit:
1116         rt2x00lib_disable_radio(rt2x00dev);
1117         rt2x00lib_uninitialize(rt2x00dev);
1118         rt2x00debug_deregister(rt2x00dev);
1119
1120         __clear_bit(INTERFACE_RESUME, &rt2x00dev->flags);
1121
1122         return retval;
1123 }
1124 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1125 #endif /* CONFIG_PM */
1126
1127 /*
1128  * rt2x00lib module information.
1129  */
1130 MODULE_AUTHOR(DRV_PROJECT);
1131 MODULE_VERSION(DRV_VERSION);
1132 MODULE_DESCRIPTION("rt2x00 library");
1133 MODULE_LICENSE("GPL");