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