drivers/net/wireless/rt2x00/rt2x00dev.c

   1 /*
   2         Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00lib
  23         Abstract: rt2x00 generic device routines.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28
  29 #include "rt2x00.h"
  30 #include "rt2x00lib.h"
  31
  32 /*
  33  * Radio control handlers.
  34  */
  35 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  36 {
  37         int status;
  38
  39         /*
  40          * Don't enable the radio twice.
  41          * And check if the hardware button has been disabled.
  42          */
  43         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  44                 return 0;
  45
  46         /*
  47          * Initialize all data queues.
  48          */
  49         rt2x00queue_init_queues(rt2x00dev);
  50
  51         /*
  52          * Enable radio.
  53          */
  54         status =
  55             rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
  56         if (status)
  57                 return status;
  58
  59         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
  60
  61         rt2x00leds_led_radio(rt2x00dev, true);
  62         rt2x00led_led_activity(rt2x00dev, true);
  63
  64         set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
  65
  66         /*
  67          * Enable RX.
  68          */
  69         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
  70
  71         /*
  72          * Start the TX queues.
  73          */
  74         ieee80211_wake_queues(rt2x00dev->hw);
  75
  76         return 0;
  77 }
  78
  79 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
  80 {
  81         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  82                 return;
  83
  84         /*
  85          * Stop the TX queues in mac80211.
  86          */
  87         ieee80211_stop_queues(rt2x00dev->hw);
  88         rt2x00queue_stop_queues(rt2x00dev);
  89
  90         /*
  91          * Disable RX.
  92          */
  93         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
  94
  95         /*
  96          * Disable radio.
  97          */
  98         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
  99         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 100         rt2x00led_led_activity(rt2x00dev, false);
 101         rt2x00leds_led_radio(rt2x00dev, false);
 102 }
 103
 104 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 105 {
 106         /*
 107          * When we are disabling the RX, we should also stop the link tuner.
 108          */
 109         if (state == STATE_RADIO_RX_OFF)
 110                 rt2x00link_stop_tuner(rt2x00dev);
 111
 112         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 113
 114         /*
 115          * When we are enabling the RX, we should also start the link tuner.
 116          */
 117         if (state == STATE_RADIO_RX_ON)
 118                 rt2x00link_start_tuner(rt2x00dev);
 119 }
 120
 121 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 122                                           struct ieee80211_vif *vif)
 123 {
 124         struct rt2x00_dev *rt2x00dev = data;
 125         struct rt2x00_intf *intf = vif_to_intf(vif);
 126         int delayed_flags;
 127
 128         /*
 129          * Copy all data we need during this action under the protection
 130          * of a spinlock. Otherwise race conditions might occur which results
 131          * into an invalid configuration.
 132          */
 133         spin_lock(&intf->lock);
 134
 135         delayed_flags = intf->delayed_flags;
 136         intf->delayed_flags = 0;
 137
 138         spin_unlock(&intf->lock);
 139
 140         /*
 141          * It is possible the radio was disabled while the work had been
 142          * scheduled. If that happens we should return here immediately,
 143          * note that in the spinlock protected area above the delayed_flags
 144          * have been cleared correctly.
 145          */
 146         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 147                 return;
 148
 149         if (delayed_flags & DELAYED_UPDATE_BEACON)
 150                 rt2x00queue_update_beacon(rt2x00dev, vif, true);
 151 }
 152
 153 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 154 {
 155         struct rt2x00_dev *rt2x00dev =
 156             container_of(work, struct rt2x00_dev, intf_work);
 157
 158         /*
 159          * Iterate over each interface and perform the
 160          * requested configurations.
 161          */
 162         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 163                                             rt2x00lib_intf_scheduled_iter,
 164                                             rt2x00dev);
 165 }
 166
 167 /*
 168  * Interrupt context handlers.
 169  */
 170 static void rt2x00lib_beacondone_iter(void *data, u8 *mac,
 171                                       struct ieee80211_vif *vif)
 172 {
 173         struct rt2x00_intf *intf = vif_to_intf(vif);
 174
 175         if (vif->type != NL80211_IFTYPE_AP &&
 176             vif->type != NL80211_IFTYPE_ADHOC &&
 177             vif->type != NL80211_IFTYPE_MESH_POINT &&
 178             vif->type != NL80211_IFTYPE_WDS)
 179                 return;
 180
 181         spin_lock(&intf->lock);
 182         intf->delayed_flags |= DELAYED_UPDATE_BEACON;
 183         spin_unlock(&intf->lock);
 184 }
 185
 186 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 187 {
 188         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 189                 return;
 190
 191         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 192                                                    rt2x00lib_beacondone_iter,
 193                                                    rt2x00dev);
 194
 195         ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->intf_work);
 196 }
 197 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 198
 199 void rt2x00lib_txdone(struct queue_entry *entry,
 200                       struct txdone_entry_desc *txdesc)
 201 {
 202         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 203         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 204         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 205         enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
 206         unsigned int header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 207         u8 rate_idx, rate_flags, retry_rates;
 208         u8 skbdesc_flags = skbdesc->flags;
 209         unsigned int i;
 210         bool success;
 211
 212         /*
 213          * Unmap the skb.
 214          */
 215         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 216
 217         /*
 218          * Remove L2 padding which was added during
 219          */
 220         if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
 221                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 222
 223         /*
 224          * If the IV/EIV data was stripped from the frame before it was
 225          * passed to the hardware, we should now reinsert it again because
 226          * mac80211 will expect the the same data to be present it the
 227          * frame as it was passed to us.
 228          */
 229         if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
 230                 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
 231
 232         /*
 233          * Send frame to debugfs immediately, after this call is completed
 234          * we are going to overwrite the skb->cb array.
 235          */
 236         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 237
 238         /*
 239          * Determine if the frame has been successfully transmitted.
 240          */
 241         success =
 242             test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 243             test_bit(TXDONE_UNKNOWN, &txdesc->flags) ||
 244             test_bit(TXDONE_FALLBACK, &txdesc->flags);
 245
 246         /*
 247          * Update TX statistics.
 248          */
 249         rt2x00dev->link.qual.tx_success += success;
 250         rt2x00dev->link.qual.tx_failed += !success;
 251
 252         rate_idx = skbdesc->tx_rate_idx;
 253         rate_flags = skbdesc->tx_rate_flags;
 254         retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
 255             (txdesc->retry + 1) : 1;
 256
 257         /*
 258          * Initialize TX status
 259          */
 260         memset(&tx_info->status, 0, sizeof(tx_info->status));
 261         tx_info->status.ack_signal = 0;
 262
 263         /*
 264          * Frame was send with retries, hardware tried
 265          * different rates to send out the frame, at each
 266          * retry it lowered the rate 1 step.
 267          */
 268         for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
 269                 tx_info->status.rates[i].idx = rate_idx - i;
 270                 tx_info->status.rates[i].flags = rate_flags;
 271                 tx_info->status.rates[i].count = 1;
 272         }
 273         if (i < (IEEE80211_TX_MAX_RATES - 1))
 274                 tx_info->status.rates[i].idx = -1; /* terminate */
 275
 276         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 277                 if (success)
 278                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 279                 else
 280                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 281         }
 282
 283         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 284                 if (success)
 285                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 286                 else
 287                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 288         }
 289
 290         /*
 291          * Only send the status report to mac80211 when it's a frame
 292          * that originated in mac80211. If this was a extra frame coming
 293          * through a mac80211 library call (RTS/CTS) then we should not
 294          * send the status report back.
 295          */
 296         if (!(skbdesc_flags & SKBDESC_NOT_MAC80211))
 297                 ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb);
 298         else
 299                 dev_kfree_skb_irq(entry->skb);
 300
 301         /*
 302          * Make this entry available for reuse.
 303          */
 304         entry->skb = NULL;
 305         entry->flags = 0;
 306
 307         rt2x00dev->ops->lib->clear_entry(entry);
 308
 309         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 310         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 311
 312         /*
 313          * If the data queue was below the threshold before the txdone
 314          * handler we must make sure the packet queue in the mac80211 stack
 315          * is reenabled when the txdone handler has finished.
 316          */
 317         if (!rt2x00queue_threshold(entry->queue))
 318                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 319 }
 320 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 321
 322 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 323                                         struct rxdone_entry_desc *rxdesc)
 324 {
 325         struct ieee80211_supported_band *sband;
 326         const struct rt2x00_rate *rate;
 327         unsigned int i;
 328         int signal;
 329         int type;
 330
 331         /*
 332          * For non-HT rates the MCS value needs to contain the
 333          * actually used rate modulation (CCK or OFDM).
 334          */
 335         if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 336                 signal = RATE_MCS(rxdesc->rate_mode, rxdesc->signal);
 337         else
 338                 signal = rxdesc->signal;
 339
 340         type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 341
 342         sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 343         for (i = 0; i < sband->n_bitrates; i++) {
 344                 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 345
 346                 if (((type == RXDONE_SIGNAL_PLCP) &&
 347                      (rate->plcp == signal)) ||
 348                     ((type == RXDONE_SIGNAL_BITRATE) &&
 349                       (rate->bitrate == signal)) ||
 350                     ((type == RXDONE_SIGNAL_MCS) &&
 351                       (rate->mcs == signal))) {
 352                         return i;
 353                 }
 354         }
 355
 356         WARNING(rt2x00dev, "Frame received with unrecognized signal, "
 357                 "signal=0x%.4x, type=%d.\n", signal, type);
 358         return 0;
 359 }
 360
 361 void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
 362                       struct queue_entry *entry)
 363 {
 364         struct rxdone_entry_desc rxdesc;
 365         struct sk_buff *skb;
 366         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 367         unsigned int header_length;
 368         int rate_idx;
 369         /*
 370          * Allocate a new sk_buffer. If no new buffer available, drop the
 371          * received frame and reuse the existing buffer.
 372          */
 373         skb = rt2x00queue_alloc_rxskb(rt2x00dev, entry);
 374         if (!skb)
 375                 return;
 376
 377         /*
 378          * Unmap the skb.
 379          */
 380         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 381
 382         /*
 383          * Extract the RXD details.
 384          */
 385         memset(&rxdesc, 0, sizeof(rxdesc));
 386         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 387
 388         /* Trim buffer to correct size */
 389         skb_trim(entry->skb, rxdesc.size);
 390
 391         /*
 392          * The data behind the ieee80211 header must be
 393          * aligned on a 4 byte boundary.
 394          */
 395         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 396
 397         /*
 398          * Hardware might have stripped the IV/EIV/ICV data,
 399          * in that case it is possible that the data was
 400          * provided seperately (through hardware descriptor)
 401          * in which case we should reinsert the data into the frame.
 402          */
 403         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 404             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 405                 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
 406                                           &rxdesc);
 407         else if (rxdesc.dev_flags & RXDONE_L2PAD)
 408                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 409         else
 410                 rt2x00queue_align_payload(entry->skb, header_length);
 411
 412         /*
 413          * Check if the frame was received using HT. In that case,
 414          * the rate is the MCS index and should be passed to mac80211
 415          * directly. Otherwise we need to translate the signal to
 416          * the correct bitrate index.
 417          */
 418         if (rxdesc.rate_mode == RATE_MODE_CCK ||
 419             rxdesc.rate_mode == RATE_MODE_OFDM) {
 420                 rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 421         } else {
 422                 rxdesc.flags |= RX_FLAG_HT;
 423                 rate_idx = rxdesc.signal;
 424         }
 425
 426         /*
 427          * Update extra components
 428          */
 429         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 430         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 431
 432         rx_status->mactime = rxdesc.timestamp;
 433         rx_status->rate_idx = rate_idx;
 434         rx_status->signal = rxdesc.rssi;
 435         rx_status->noise = rxdesc.noise;
 436         rx_status->flag = rxdesc.flags;
 437         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 438
 439         /*
 440          * Send frame to mac80211 & debugfs.
 441          * mac80211 will clean up the skb structure.
 442          */
 443         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 444         memcpy(IEEE80211_SKB_RXCB(entry->skb), rx_status, sizeof(*rx_status));
 445         ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb);
 446
 447         /*
 448          * Replace the skb with the freshly allocated one.
 449          */
 450         entry->skb = skb;
 451         entry->flags = 0;
 452
 453         rt2x00dev->ops->lib->clear_entry(entry);
 454
 455         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 456 }
 457 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 458
 459 /*
 460  * Driver initialization handlers.
 461  */
 462 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 463         {
 464                 .flags = DEV_RATE_CCK,
 465                 .bitrate = 10,
 466                 .ratemask = BIT(0),
 467                 .plcp = 0x00,
 468                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 469         },
 470         {
 471                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 472                 .bitrate = 20,
 473                 .ratemask = BIT(1),
 474                 .plcp = 0x01,
 475                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 476         },
 477         {
 478                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 479                 .bitrate = 55,
 480                 .ratemask = BIT(2),
 481                 .plcp = 0x02,
 482                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 483         },
 484         {
 485                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 486                 .bitrate = 110,
 487                 .ratemask = BIT(3),
 488                 .plcp = 0x03,
 489                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 490         },
 491         {
 492                 .flags = DEV_RATE_OFDM,
 493                 .bitrate = 60,
 494                 .ratemask = BIT(4),
 495                 .plcp = 0x0b,
 496                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 497         },
 498         {
 499                 .flags = DEV_RATE_OFDM,
 500                 .bitrate = 90,
 501                 .ratemask = BIT(5),
 502                 .plcp = 0x0f,
 503                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 504         },
 505         {
 506                 .flags = DEV_RATE_OFDM,
 507                 .bitrate = 120,
 508                 .ratemask = BIT(6),
 509                 .plcp = 0x0a,
 510                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 511         },
 512         {
 513                 .flags = DEV_RATE_OFDM,
 514                 .bitrate = 180,
 515                 .ratemask = BIT(7),
 516                 .plcp = 0x0e,
 517                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 518         },
 519         {
 520                 .flags = DEV_RATE_OFDM,
 521                 .bitrate = 240,
 522                 .ratemask = BIT(8),
 523                 .plcp = 0x09,
 524                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 525         },
 526         {
 527                 .flags = DEV_RATE_OFDM,
 528                 .bitrate = 360,
 529                 .ratemask = BIT(9),
 530                 .plcp = 0x0d,
 531                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 532         },
 533         {
 534                 .flags = DEV_RATE_OFDM,
 535                 .bitrate = 480,
 536                 .ratemask = BIT(10),
 537                 .plcp = 0x08,
 538                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 539         },
 540         {
 541                 .flags = DEV_RATE_OFDM,
 542                 .bitrate = 540,
 543                 .ratemask = BIT(11),
 544                 .plcp = 0x0c,
 545                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 546         },
 547 };
 548
 549 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 550                               const int channel, const int tx_power,
 551                               const int value)
 552 {
 553         entry->center_freq = ieee80211_channel_to_frequency(channel);
 554         entry->hw_value = value;
 555         entry->max_power = tx_power;
 556         entry->max_antenna_gain = 0xff;
 557 }
 558
 559 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 560                            const u16 index, const struct rt2x00_rate *rate)
 561 {
 562         entry->flags = 0;
 563         entry->bitrate = rate->bitrate;
 564         entry->hw_value =index;
 565         entry->hw_value_short = index;
 566
 567         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 568                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 569 }
 570
 571 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 572                                     struct hw_mode_spec *spec)
 573 {
 574         struct ieee80211_hw *hw = rt2x00dev->hw;
 575         struct ieee80211_channel *channels;
 576         struct ieee80211_rate *rates;
 577         unsigned int num_rates;
 578         unsigned int i;
 579
 580         num_rates = 0;
 581         if (spec->supported_rates & SUPPORT_RATE_CCK)
 582                 num_rates += 4;
 583         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 584                 num_rates += 8;
 585
 586         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 587         if (!channels)
 588                 return -ENOMEM;
 589
 590         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 591         if (!rates)
 592                 goto exit_free_channels;
 593
 594         /*
 595          * Initialize Rate list.
 596          */
 597         for (i = 0; i < num_rates; i++)
 598                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 599
 600         /*
 601          * Initialize Channel list.
 602          */
 603         for (i = 0; i < spec->num_channels; i++) {
 604                 rt2x00lib_channel(&channels[i],
 605                                   spec->channels[i].channel,
 606                                   spec->channels_info[i].tx_power1, i);
 607         }
 608
 609         /*
 610          * Intitialize 802.11b, 802.11g
 611          * Rates: CCK, OFDM.
 612          * Channels: 2.4 GHz
 613          */
 614         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 615                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 616                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 617                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 618                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 619                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 620                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 621                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
 622                        &spec->ht, sizeof(spec->ht));
 623         }
 624
 625         /*
 626          * Intitialize 802.11a
 627          * Rates: OFDM.
 628          * Channels: OFDM, UNII, HiperLAN2.
 629          */
 630         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 631                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 632                     spec->num_channels - 14;
 633                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 634                     num_rates - 4;
 635                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 636                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 637                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 638                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 639                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
 640                        &spec->ht, sizeof(spec->ht));
 641         }
 642
 643         return 0;
 644
 645  exit_free_channels:
 646         kfree(channels);
 647         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 648         return -ENOMEM;
 649 }
 650
 651 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 652 {
 653         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 654                 ieee80211_unregister_hw(rt2x00dev->hw);
 655
 656         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 657                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 658                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 659                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 660                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 661         }
 662
 663         kfree(rt2x00dev->spec.channels_info);
 664 }
 665
 666 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 667 {
 668         struct hw_mode_spec *spec = &rt2x00dev->spec;
 669         int status;
 670
 671         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 672                 return 0;
 673
 674         /*
 675          * Initialize HW modes.
 676          */
 677         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 678         if (status)
 679                 return status;
 680
 681         /*
 682          * Initialize HW fields.
 683          */
 684         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 685
 686         /*
 687          * Initialize extra TX headroom required.
 688          */
 689         rt2x00dev->hw->extra_tx_headroom =
 690                 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
 691                       rt2x00dev->ops->extra_tx_headroom);
 692
 693         /*
 694          * Take TX headroom required for alignment into account.
 695          */
 696         if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
 697                 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
 698         else if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags))
 699                 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
 700
 701         /*
 702          * Register HW.
 703          */
 704         status = ieee80211_register_hw(rt2x00dev->hw);
 705         if (status)
 706                 return status;
 707
 708         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 709
 710         return 0;
 711 }
 712
 713 /*
 714  * Initialization/uninitialization handlers.
 715  */
 716 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 717 {
 718         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 719                 return;
 720
 721         /*
 722          * Unregister extra components.
 723          */
 724         rt2x00rfkill_unregister(rt2x00dev);
 725
 726         /*
 727          * Allow the HW to uninitialize.
 728          */
 729         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 730
 731         /*
 732          * Free allocated queue entries.
 733          */
 734         rt2x00queue_uninitialize(rt2x00dev);
 735 }
 736
 737 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 738 {
 739         int status;
 740
 741         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 742                 return 0;
 743
 744         /*
 745          * Allocate all queue entries.
 746          */
 747         status = rt2x00queue_initialize(rt2x00dev);
 748         if (status)
 749                 return status;
 750
 751         /*
 752          * Initialize the device.
 753          */
 754         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 755         if (status) {
 756                 rt2x00queue_uninitialize(rt2x00dev);
 757                 return status;
 758         }
 759
 760         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
 761
 762         /*
 763          * Register the extra components.
 764          */
 765         rt2x00rfkill_register(rt2x00dev);
 766
 767         return 0;
 768 }
 769
 770 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 771 {
 772         int retval;
 773
 774         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 775                 return 0;
 776
 777         /*
 778          * If this is the first interface which is added,
 779          * we should load the firmware now.
 780          */
 781         retval = rt2x00lib_load_firmware(rt2x00dev);
 782         if (retval)
 783                 return retval;
 784
 785         /*
 786          * Initialize the device.
 787          */
 788         retval = rt2x00lib_initialize(rt2x00dev);
 789         if (retval)
 790                 return retval;
 791
 792         rt2x00dev->intf_ap_count = 0;
 793         rt2x00dev->intf_sta_count = 0;
 794         rt2x00dev->intf_associated = 0;
 795
 796         /* Enable the radio */
 797         retval = rt2x00lib_enable_radio(rt2x00dev);
 798         if (retval) {
 799                 rt2x00queue_uninitialize(rt2x00dev);
 800                 return retval;
 801         }
 802
 803         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
 804
 805         return 0;
 806 }
 807
 808 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
 809 {
 810         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 811                 return;
 812
 813         /*
 814          * Perhaps we can add something smarter here,
 815          * but for now just disabling the radio should do.
 816          */
 817         rt2x00lib_disable_radio(rt2x00dev);
 818
 819         rt2x00dev->intf_ap_count = 0;
 820         rt2x00dev->intf_sta_count = 0;
 821         rt2x00dev->intf_associated = 0;
 822 }
 823
 824 /*
 825  * driver allocation handlers.
 826  */
 827 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 828 {
 829         int retval = -ENOMEM;
 830
 831         mutex_init(&rt2x00dev->csr_mutex);
 832
 833         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 834
 835         /*
 836          * Make room for rt2x00_intf inside the per-interface
 837          * structure ieee80211_vif.
 838          */
 839         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
 840
 841         /*
 842          * Determine which operating modes are supported, all modes
 843          * which require beaconing, depend on the availability of
 844          * beacon entries.
 845          */
 846         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
 847         if (rt2x00dev->ops->bcn->entry_num > 0)
 848                 rt2x00dev->hw->wiphy->interface_modes |=
 849                     BIT(NL80211_IFTYPE_ADHOC) |
 850                     BIT(NL80211_IFTYPE_AP) |
 851                     BIT(NL80211_IFTYPE_MESH_POINT) |
 852                     BIT(NL80211_IFTYPE_WDS);
 853
 854         /*
 855          * Let the driver probe the device to detect the capabilities.
 856          */
 857         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
 858         if (retval) {
 859                 ERROR(rt2x00dev, "Failed to allocate device.\n");
 860                 goto exit;
 861         }
 862
 863         /*
 864          * Initialize configuration work.
 865          */
 866         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
 867
 868         /*
 869          * Allocate queue array.
 870          */
 871         retval = rt2x00queue_allocate(rt2x00dev);
 872         if (retval)
 873                 goto exit;
 874
 875         /*
 876          * Initialize ieee80211 structure.
 877          */
 878         retval = rt2x00lib_probe_hw(rt2x00dev);
 879         if (retval) {
 880                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
 881                 goto exit;
 882         }
 883
 884         /*
 885          * Register extra components.
 886          */
 887         rt2x00link_register(rt2x00dev);
 888         rt2x00leds_register(rt2x00dev);
 889         rt2x00debug_register(rt2x00dev);
 890
 891         return 0;
 892
 893 exit:
 894         rt2x00lib_remove_dev(rt2x00dev);
 895
 896         return retval;
 897 }
 898 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
 899
 900 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
 901 {
 902         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 903
 904         /*
 905          * Disable radio.
 906          */
 907         rt2x00lib_disable_radio(rt2x00dev);
 908
 909         /*
 910          * Stop all work.
 911          */
 912         cancel_work_sync(&rt2x00dev->intf_work);
 913
 914         /*
 915          * Uninitialize device.
 916          */
 917         rt2x00lib_uninitialize(rt2x00dev);
 918
 919         /*
 920          * Free extra components
 921          */
 922         rt2x00debug_deregister(rt2x00dev);
 923         rt2x00leds_unregister(rt2x00dev);
 924
 925         /*
 926          * Free ieee80211_hw memory.
 927          */
 928         rt2x00lib_remove_hw(rt2x00dev);
 929
 930         /*
 931          * Free firmware image.
 932          */
 933         rt2x00lib_free_firmware(rt2x00dev);
 934
 935         /*
 936          * Free queue structures.
 937          */
 938         rt2x00queue_free(rt2x00dev);
 939 }
 940 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
 941
 942 /*
 943  * Device state handlers
 944  */
 945 #ifdef CONFIG_PM
 946 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
 947 {
 948         NOTICE(rt2x00dev, "Going to sleep.\n");
 949
 950         /*
 951          * Prevent mac80211 from accessing driver while suspended.
 952          */
 953         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 954                 return 0;
 955
 956         /*
 957          * Cleanup as much as possible.
 958          */
 959         rt2x00lib_uninitialize(rt2x00dev);
 960
 961         /*
 962          * Suspend/disable extra components.
 963          */
 964         rt2x00leds_suspend(rt2x00dev);
 965         rt2x00debug_deregister(rt2x00dev);
 966
 967         /*
 968          * Set device mode to sleep for power management,
 969          * on some hardware this call seems to consistently fail.
 970          * From the specifications it is hard to tell why it fails,
 971          * and if this is a "bad thing".
 972          * Overall it is safe to just ignore the failure and
 973          * continue suspending. The only downside is that the
 974          * device will not be in optimal power save mode, but with
 975          * the radio and the other components already disabled the
 976          * device is as good as disabled.
 977          */
 978         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
 979                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
 980                         "continue suspending.\n");
 981
 982         return 0;
 983 }
 984 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
 985
 986 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
 987 {
 988         NOTICE(rt2x00dev, "Waking up.\n");
 989
 990         /*
 991          * Restore/enable extra components.
 992          */
 993         rt2x00debug_register(rt2x00dev);
 994         rt2x00leds_resume(rt2x00dev);
 995
 996         /*
 997          * We are ready again to receive requests from mac80211.
 998          */
 999         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1000
1001         return 0;
1002 }
1003 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1004 #endif /* CONFIG_PM */
1005
1006 /*
1007  * rt2x00lib module information.
1008  */
1009 MODULE_AUTHOR(DRV_PROJECT);
1010 MODULE_VERSION(DRV_VERSION);
1011 MODULE_DESCRIPTION("rt2x00 library");
1012 MODULE_LICENSE("GPL");