drivers/net/wireless/rt2x00/rt2x00dev.c

   1 /*
   2         Copyright (C) 2004 - 2009 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00lib
  23         Abstract: rt2x00 generic device routines.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28
  29 #include "rt2x00.h"
  30 #include "rt2x00lib.h"
  31
  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             test_bit(DEVICE_STATE_DISABLED_RADIO_HW, &rt2x00dev->flags))
  45                 return 0;
  46
  47         /*
  48          * Initialize all data queues.
  49          */
  50         rt2x00queue_init_queues(rt2x00dev);
  51
  52         /*
  53          * Enable radio.
  54          */
  55         status =
  56             rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
  57         if (status)
  58                 return status;
  59
  60         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
  61
  62         rt2x00leds_led_radio(rt2x00dev, true);
  63         rt2x00led_led_activity(rt2x00dev, true);
  64
  65         set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
  66
  67         /*
  68          * Enable RX.
  69          */
  70         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
  71
  72         /*
  73          * Start the TX queues.
  74          */
  75         ieee80211_wake_queues(rt2x00dev->hw);
  76
  77         return 0;
  78 }
  79
  80 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
  81 {
  82         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  83                 return;
  84
  85         /*
  86          * Stop the TX queues.
  87          */
  88         ieee80211_stop_queues(rt2x00dev->hw);
  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_packetfilter_scheduled(struct work_struct *work)
 122 {
 123         struct rt2x00_dev *rt2x00dev =
 124             container_of(work, struct rt2x00_dev, filter_work);
 125
 126         rt2x00dev->ops->lib->config_filter(rt2x00dev, rt2x00dev->packet_filter);
 127 }
 128
 129 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 130                                           struct ieee80211_vif *vif)
 131 {
 132         struct rt2x00_dev *rt2x00dev = data;
 133         struct rt2x00_intf *intf = vif_to_intf(vif);
 134         struct ieee80211_bss_conf conf;
 135         int delayed_flags;
 136
 137         /*
 138          * Copy all data we need during this action under the protection
 139          * of a spinlock. Otherwise race conditions might occur which results
 140          * into an invalid configuration.
 141          */
 142         spin_lock(&intf->lock);
 143
 144         memcpy(&conf, &vif->bss_conf, sizeof(conf));
 145         delayed_flags = intf->delayed_flags;
 146         intf->delayed_flags = 0;
 147
 148         spin_unlock(&intf->lock);
 149
 150         /*
 151          * It is possible the radio was disabled while the work had been
 152          * scheduled. If that happens we should return here immediately,
 153          * note that in the spinlock protected area above the delayed_flags
 154          * have been cleared correctly.
 155          */
 156         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 157                 return;
 158
 159         if (delayed_flags & DELAYED_UPDATE_BEACON)
 160                 rt2x00queue_update_beacon(rt2x00dev, vif);
 161
 162         if (delayed_flags & DELAYED_CONFIG_ERP)
 163                 rt2x00lib_config_erp(rt2x00dev, intf, &conf);
 164
 165         if (delayed_flags & DELAYED_LED_ASSOC)
 166                 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
 167 }
 168
 169 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 170 {
 171         struct rt2x00_dev *rt2x00dev =
 172             container_of(work, struct rt2x00_dev, intf_work);
 173
 174         /*
 175          * Iterate over each interface and perform the
 176          * requested configurations.
 177          */
 178         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 179                                             rt2x00lib_intf_scheduled_iter,
 180                                             rt2x00dev);
 181 }
 182
 183 /*
 184  * Interrupt context handlers.
 185  */
 186 static void rt2x00lib_beacondone_iter(void *data, u8 *mac,
 187                                       struct ieee80211_vif *vif)
 188 {
 189         struct rt2x00_dev *rt2x00dev = data;
 190         struct rt2x00_intf *intf = vif_to_intf(vif);
 191
 192         if (vif->type != NL80211_IFTYPE_AP &&
 193             vif->type != NL80211_IFTYPE_ADHOC &&
 194             vif->type != NL80211_IFTYPE_MESH_POINT &&
 195             vif->type != NL80211_IFTYPE_WDS)
 196                 return;
 197
 198         /*
 199          * Clean up the beacon skb.
 200          */
 201         rt2x00queue_free_skb(rt2x00dev, intf->beacon->skb);
 202         intf->beacon->skb = NULL;
 203
 204         spin_lock(&intf->lock);
 205         intf->delayed_flags |= DELAYED_UPDATE_BEACON;
 206         spin_unlock(&intf->lock);
 207 }
 208
 209 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 210 {
 211         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 212                 return;
 213
 214         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 215                                                    rt2x00lib_beacondone_iter,
 216                                                    rt2x00dev);
 217
 218         schedule_work(&rt2x00dev->intf_work);
 219 }
 220 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 221
 222 void rt2x00lib_txdone(struct queue_entry *entry,
 223                       struct txdone_entry_desc *txdesc)
 224 {
 225         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 226         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 227         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 228         enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
 229         u8 rate_idx, rate_flags;
 230
 231         /*
 232          * Unmap the skb.
 233          */
 234         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 235
 236         /*
 237          * If the IV/EIV data was stripped from the frame before it was
 238          * passed to the hardware, we should now reinsert it again because
 239          * mac80211 will expect the the same data to be present it the
 240          * frame as it was passed to us.
 241          */
 242         if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
 243                 rt2x00crypto_tx_insert_iv(entry->skb);
 244
 245         /*
 246          * Send frame to debugfs immediately, after this call is completed
 247          * we are going to overwrite the skb->cb array.
 248          */
 249         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 250
 251         /*
 252          * Update TX statistics.
 253          */
 254         rt2x00dev->link.qual.tx_success +=
 255             test_bit(TXDONE_SUCCESS, &txdesc->flags);
 256         rt2x00dev->link.qual.tx_failed +=
 257             test_bit(TXDONE_FAILURE, &txdesc->flags);
 258
 259         rate_idx = skbdesc->tx_rate_idx;
 260         rate_flags = skbdesc->tx_rate_flags;
 261
 262         /*
 263          * Initialize TX status
 264          */
 265         memset(&tx_info->status, 0, sizeof(tx_info->status));
 266         tx_info->status.ack_signal = 0;
 267         tx_info->status.rates[0].idx = rate_idx;
 268         tx_info->status.rates[0].flags = rate_flags;
 269         tx_info->status.rates[0].count = txdesc->retry + 1;
 270         tx_info->status.rates[1].idx = -1; /* terminate */
 271
 272         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 273                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 274                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 275                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 276                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 277         }
 278
 279         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 280                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 281                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 282                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 283                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 284         }
 285
 286         /*
 287          * Only send the status report to mac80211 when TX status was
 288          * requested by it. If this was a extra frame coming through
 289          * a mac80211 library call (RTS/CTS) then we should not send the
 290          * status report back.
 291          */
 292         if (tx_info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)
 293                 ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb);
 294         else
 295                 dev_kfree_skb_irq(entry->skb);
 296
 297         /*
 298          * Make this entry available for reuse.
 299          */
 300         entry->skb = NULL;
 301         entry->flags = 0;
 302
 303         rt2x00dev->ops->lib->clear_entry(entry);
 304
 305         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 306         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 307
 308         /*
 309          * If the data queue was below the threshold before the txdone
 310          * handler we must make sure the packet queue in the mac80211 stack
 311          * is reenabled when the txdone handler has finished.
 312          */
 313         if (!rt2x00queue_threshold(entry->queue))
 314                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 315 }
 316 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 317
 318 void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
 319                       struct queue_entry *entry)
 320 {
 321         struct rxdone_entry_desc rxdesc;
 322         struct sk_buff *skb;
 323         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 324         struct ieee80211_supported_band *sband;
 325         const struct rt2x00_rate *rate;
 326         unsigned int header_length;
 327         unsigned int align;
 328         unsigned int i;
 329         int idx = -1;
 330
 331         /*
 332          * Allocate a new sk_buffer. If no new buffer available, drop the
 333          * received frame and reuse the existing buffer.
 334          */
 335         skb = rt2x00queue_alloc_rxskb(rt2x00dev, entry);
 336         if (!skb)
 337                 return;
 338
 339         /*
 340          * Unmap the skb.
 341          */
 342         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 343
 344         /*
 345          * Extract the RXD details.
 346          */
 347         memset(&rxdesc, 0, sizeof(rxdesc));
 348         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 349
 350         /*
 351          * The data behind the ieee80211 header must be
 352          * aligned on a 4 byte boundary.
 353          */
 354         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 355         align = ((unsigned long)(entry->skb->data + header_length)) & 3;
 356
 357         /*
 358          * Hardware might have stripped the IV/EIV/ICV data,
 359          * in that case it is possible that the data was
 360          * provided seperately (through hardware descriptor)
 361          * in which case we should reinsert the data into the frame.
 362          */
 363         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 364             (rxdesc.flags & RX_FLAG_IV_STRIPPED)) {
 365                 rt2x00crypto_rx_insert_iv(entry->skb, align,
 366                                           header_length, &rxdesc);
 367         } else if (align) {
 368                 skb_push(entry->skb, align);
 369                 /* Move entire frame in 1 command */
 370                 memmove(entry->skb->data, entry->skb->data + align,
 371                         rxdesc.size);
 372         }
 373
 374         /* Update data pointers, trim buffer to correct size */
 375         skb_trim(entry->skb, rxdesc.size);
 376
 377         /*
 378          * Update RX statistics.
 379          */
 380         sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 381         for (i = 0; i < sband->n_bitrates; i++) {
 382                 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 383
 384                 if (((rxdesc.dev_flags & RXDONE_SIGNAL_PLCP) &&
 385                      (rate->plcp == rxdesc.signal)) ||
 386                     ((rxdesc.dev_flags & RXDONE_SIGNAL_BITRATE) &&
 387                       (rate->bitrate == rxdesc.signal))) {
 388                         idx = i;
 389                         break;
 390                 }
 391         }
 392
 393         if (idx < 0) {
 394                 WARNING(rt2x00dev, "Frame received with unrecognized signal,"
 395                         "signal=0x%.2x, type=%d.\n", rxdesc.signal,
 396                         (rxdesc.dev_flags & RXDONE_SIGNAL_MASK));
 397                 idx = 0;
 398         }
 399
 400         /*
 401          * Update extra components
 402          */
 403         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 404         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 405
 406         rx_status->mactime = rxdesc.timestamp;
 407         rx_status->rate_idx = idx;
 408         rx_status->qual = rt2x00link_calculate_signal(rt2x00dev, rxdesc.rssi);
 409         rx_status->signal = rxdesc.rssi;
 410         rx_status->noise = rxdesc.noise;
 411         rx_status->flag = rxdesc.flags;
 412         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 413
 414         /*
 415          * Send frame to mac80211 & debugfs.
 416          * mac80211 will clean up the skb structure.
 417          */
 418         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 419         ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb, rx_status);
 420
 421         /*
 422          * Replace the skb with the freshly allocated one.
 423          */
 424         entry->skb = skb;
 425         entry->flags = 0;
 426
 427         rt2x00dev->ops->lib->clear_entry(entry);
 428
 429         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 430 }
 431 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 432
 433 /*
 434  * Driver initialization handlers.
 435  */
 436 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 437         {
 438                 .flags = DEV_RATE_CCK,
 439                 .bitrate = 10,
 440                 .ratemask = BIT(0),
 441                 .plcp = 0x00,
 442         },
 443         {
 444                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 445                 .bitrate = 20,
 446                 .ratemask = BIT(1),
 447                 .plcp = 0x01,
 448         },
 449         {
 450                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 451                 .bitrate = 55,
 452                 .ratemask = BIT(2),
 453                 .plcp = 0x02,
 454         },
 455         {
 456                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 457                 .bitrate = 110,
 458                 .ratemask = BIT(3),
 459                 .plcp = 0x03,
 460         },
 461         {
 462                 .flags = DEV_RATE_OFDM,
 463                 .bitrate = 60,
 464                 .ratemask = BIT(4),
 465                 .plcp = 0x0b,
 466         },
 467         {
 468                 .flags = DEV_RATE_OFDM,
 469                 .bitrate = 90,
 470                 .ratemask = BIT(5),
 471                 .plcp = 0x0f,
 472         },
 473         {
 474                 .flags = DEV_RATE_OFDM,
 475                 .bitrate = 120,
 476                 .ratemask = BIT(6),
 477                 .plcp = 0x0a,
 478         },
 479         {
 480                 .flags = DEV_RATE_OFDM,
 481                 .bitrate = 180,
 482                 .ratemask = BIT(7),
 483                 .plcp = 0x0e,
 484         },
 485         {
 486                 .flags = DEV_RATE_OFDM,
 487                 .bitrate = 240,
 488                 .ratemask = BIT(8),
 489                 .plcp = 0x09,
 490         },
 491         {
 492                 .flags = DEV_RATE_OFDM,
 493                 .bitrate = 360,
 494                 .ratemask = BIT(9),
 495                 .plcp = 0x0d,
 496         },
 497         {
 498                 .flags = DEV_RATE_OFDM,
 499                 .bitrate = 480,
 500                 .ratemask = BIT(10),
 501                 .plcp = 0x08,
 502         },
 503         {
 504                 .flags = DEV_RATE_OFDM,
 505                 .bitrate = 540,
 506                 .ratemask = BIT(11),
 507                 .plcp = 0x0c,
 508         },
 509 };
 510
 511 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 512                               const int channel, const int tx_power,
 513                               const int value)
 514 {
 515         entry->center_freq = ieee80211_channel_to_frequency(channel);
 516         entry->hw_value = value;
 517         entry->max_power = tx_power;
 518         entry->max_antenna_gain = 0xff;
 519 }
 520
 521 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 522                            const u16 index, const struct rt2x00_rate *rate)
 523 {
 524         entry->flags = 0;
 525         entry->bitrate = rate->bitrate;
 526         entry->hw_value =index;
 527         entry->hw_value_short = index;
 528
 529         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 530                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 531 }
 532
 533 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 534                                     struct hw_mode_spec *spec)
 535 {
 536         struct ieee80211_hw *hw = rt2x00dev->hw;
 537         struct ieee80211_channel *channels;
 538         struct ieee80211_rate *rates;
 539         unsigned int num_rates;
 540         unsigned int i;
 541
 542         num_rates = 0;
 543         if (spec->supported_rates & SUPPORT_RATE_CCK)
 544                 num_rates += 4;
 545         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 546                 num_rates += 8;
 547
 548         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 549         if (!channels)
 550                 return -ENOMEM;
 551
 552         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 553         if (!rates)
 554                 goto exit_free_channels;
 555
 556         /*
 557          * Initialize Rate list.
 558          */
 559         for (i = 0; i < num_rates; i++)
 560                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 561
 562         /*
 563          * Initialize Channel list.
 564          */
 565         for (i = 0; i < spec->num_channels; i++) {
 566                 rt2x00lib_channel(&channels[i],
 567                                   spec->channels[i].channel,
 568                                   spec->channels_info[i].tx_power1, i);
 569         }
 570
 571         /*
 572          * Intitialize 802.11b, 802.11g
 573          * Rates: CCK, OFDM.
 574          * Channels: 2.4 GHz
 575          */
 576         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 577                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 578                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 579                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 580                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 581                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 582                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 583         }
 584
 585         /*
 586          * Intitialize 802.11a
 587          * Rates: OFDM.
 588          * Channels: OFDM, UNII, HiperLAN2.
 589          */
 590         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 591                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 592                     spec->num_channels - 14;
 593                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 594                     num_rates - 4;
 595                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 596                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 597                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 598                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 599         }
 600
 601         return 0;
 602
 603  exit_free_channels:
 604         kfree(channels);
 605         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 606         return -ENOMEM;
 607 }
 608
 609 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 610 {
 611         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 612                 ieee80211_unregister_hw(rt2x00dev->hw);
 613
 614         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 615                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 616                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 617                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 618                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 619         }
 620
 621         kfree(rt2x00dev->spec.channels_info);
 622 }
 623
 624 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 625 {
 626         struct hw_mode_spec *spec = &rt2x00dev->spec;
 627         int status;
 628
 629         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 630                 return 0;
 631
 632         /*
 633          * Initialize HW modes.
 634          */
 635         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 636         if (status)
 637                 return status;
 638
 639         /*
 640          * Initialize HW fields.
 641          */
 642         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 643
 644         /*
 645          * Register HW.
 646          */
 647         status = ieee80211_register_hw(rt2x00dev->hw);
 648         if (status) {
 649                 rt2x00lib_remove_hw(rt2x00dev);
 650                 return status;
 651         }
 652
 653         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 654
 655         return 0;
 656 }
 657
 658 /*
 659  * Initialization/uninitialization handlers.
 660  */
 661 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 662 {
 663         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 664                 return;
 665
 666         /*
 667          * Unregister extra components.
 668          */
 669         rt2x00rfkill_unregister(rt2x00dev);
 670
 671         /*
 672          * Allow the HW to uninitialize.
 673          */
 674         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 675
 676         /*
 677          * Free allocated queue entries.
 678          */
 679         rt2x00queue_uninitialize(rt2x00dev);
 680 }
 681
 682 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 683 {
 684         int status;
 685
 686         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 687                 return 0;
 688
 689         /*
 690          * Allocate all queue entries.
 691          */
 692         status = rt2x00queue_initialize(rt2x00dev);
 693         if (status)
 694                 return status;
 695
 696         /*
 697          * Initialize the device.
 698          */
 699         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 700         if (status) {
 701                 rt2x00queue_uninitialize(rt2x00dev);
 702                 return status;
 703         }
 704
 705         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
 706
 707         /*
 708          * Register the extra components.
 709          */
 710         rt2x00rfkill_register(rt2x00dev);
 711
 712         return 0;
 713 }
 714
 715 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 716 {
 717         int retval;
 718
 719         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 720                 return 0;
 721
 722         /*
 723          * If this is the first interface which is added,
 724          * we should load the firmware now.
 725          */
 726         retval = rt2x00lib_load_firmware(rt2x00dev);
 727         if (retval)
 728                 return retval;
 729
 730         /*
 731          * Initialize the device.
 732          */
 733         retval = rt2x00lib_initialize(rt2x00dev);
 734         if (retval)
 735                 return retval;
 736
 737         rt2x00dev->intf_ap_count = 0;
 738         rt2x00dev->intf_sta_count = 0;
 739         rt2x00dev->intf_associated = 0;
 740
 741         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
 742
 743         return 0;
 744 }
 745
 746 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
 747 {
 748         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 749                 return;
 750
 751         /*
 752          * Perhaps we can add something smarter here,
 753          * but for now just disabling the radio should do.
 754          */
 755         rt2x00lib_disable_radio(rt2x00dev);
 756
 757         rt2x00dev->intf_ap_count = 0;
 758         rt2x00dev->intf_sta_count = 0;
 759         rt2x00dev->intf_associated = 0;
 760 }
 761
 762 /*
 763  * driver allocation handlers.
 764  */
 765 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 766 {
 767         int retval = -ENOMEM;
 768
 769         mutex_init(&rt2x00dev->csr_mutex);
 770
 771         /*
 772          * Make room for rt2x00_intf inside the per-interface
 773          * structure ieee80211_vif.
 774          */
 775         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
 776
 777         /*
 778          * Determine which operating modes are supported, all modes
 779          * which require beaconing, depend on the availability of
 780          * beacon entries.
 781          */
 782         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
 783         if (rt2x00dev->ops->bcn->entry_num > 0)
 784                 rt2x00dev->hw->wiphy->interface_modes |=
 785                     BIT(NL80211_IFTYPE_ADHOC) |
 786                     BIT(NL80211_IFTYPE_AP) |
 787                     BIT(NL80211_IFTYPE_MESH_POINT) |
 788                     BIT(NL80211_IFTYPE_WDS);
 789
 790         /*
 791          * Let the driver probe the device to detect the capabilities.
 792          */
 793         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
 794         if (retval) {
 795                 ERROR(rt2x00dev, "Failed to allocate device.\n");
 796                 goto exit;
 797         }
 798
 799         /*
 800          * Initialize configuration work.
 801          */
 802         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
 803         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
 804
 805         /*
 806          * Allocate queue array.
 807          */
 808         retval = rt2x00queue_allocate(rt2x00dev);
 809         if (retval)
 810                 goto exit;
 811
 812         /*
 813          * Initialize ieee80211 structure.
 814          */
 815         retval = rt2x00lib_probe_hw(rt2x00dev);
 816         if (retval) {
 817                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
 818                 goto exit;
 819         }
 820
 821         /*
 822          * Register extra components.
 823          */
 824         rt2x00link_register(rt2x00dev);
 825         rt2x00leds_register(rt2x00dev);
 826         rt2x00rfkill_allocate(rt2x00dev);
 827         rt2x00debug_register(rt2x00dev);
 828
 829         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 830
 831         return 0;
 832
 833 exit:
 834         rt2x00lib_remove_dev(rt2x00dev);
 835
 836         return retval;
 837 }
 838 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
 839
 840 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
 841 {
 842         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 843
 844         /*
 845          * Disable radio.
 846          */
 847         rt2x00lib_disable_radio(rt2x00dev);
 848
 849         /*
 850          * Uninitialize device.
 851          */
 852         rt2x00lib_uninitialize(rt2x00dev);
 853
 854         /*
 855          * Free extra components
 856          */
 857         rt2x00debug_deregister(rt2x00dev);
 858         rt2x00rfkill_free(rt2x00dev);
 859         rt2x00leds_unregister(rt2x00dev);
 860
 861         /*
 862          * Free ieee80211_hw memory.
 863          */
 864         rt2x00lib_remove_hw(rt2x00dev);
 865
 866         /*
 867          * Free firmware image.
 868          */
 869         rt2x00lib_free_firmware(rt2x00dev);
 870
 871         /*
 872          * Free queue structures.
 873          */
 874         rt2x00queue_free(rt2x00dev);
 875 }
 876 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
 877
 878 /*
 879  * Device state handlers
 880  */
 881 #ifdef CONFIG_PM
 882 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
 883 {
 884         int retval;
 885
 886         NOTICE(rt2x00dev, "Going to sleep.\n");
 887
 888         /*
 889          * Only continue if mac80211 has open interfaces.
 890          */
 891         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 892             !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 893                 goto exit;
 894
 895         set_bit(DEVICE_STATE_STARTED_SUSPEND, &rt2x00dev->flags);
 896
 897         /*
 898          * Disable radio.
 899          */
 900         rt2x00lib_stop(rt2x00dev);
 901         rt2x00lib_uninitialize(rt2x00dev);
 902
 903         /*
 904          * Suspend/disable extra components.
 905          */
 906         rt2x00leds_suspend(rt2x00dev);
 907         rt2x00debug_deregister(rt2x00dev);
 908
 909 exit:
 910         /*
 911          * Set device mode to sleep for power management,
 912          * on some hardware this call seems to consistently fail.
 913          * From the specifications it is hard to tell why it fails,
 914          * and if this is a "bad thing".
 915          * Overall it is safe to just ignore the failure and
 916          * continue suspending. The only downside is that the
 917          * device will not be in optimal power save mode, but with
 918          * the radio and the other components already disabled the
 919          * device is as good as disabled.
 920          */
 921         retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
 922         if (retval)
 923                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
 924                         "continue suspending.\n");
 925
 926         return 0;
 927 }
 928 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
 929
 930 static void rt2x00lib_resume_intf(void *data, u8 *mac,
 931                                   struct ieee80211_vif *vif)
 932 {
 933         struct rt2x00_dev *rt2x00dev = data;
 934         struct rt2x00_intf *intf = vif_to_intf(vif);
 935
 936         spin_lock(&intf->lock);
 937
 938         rt2x00lib_config_intf(rt2x00dev, intf,
 939                               vif->type, intf->mac, intf->bssid);
 940
 941
 942         /*
 943          * AP, Ad-hoc, and Mesh Point mode require a new beacon update.
 944          */
 945         if (vif->type == NL80211_IFTYPE_AP ||
 946             vif->type == NL80211_IFTYPE_ADHOC ||
 947             vif->type == NL80211_IFTYPE_MESH_POINT ||
 948             vif->type == NL80211_IFTYPE_WDS)
 949                 intf->delayed_flags |= DELAYED_UPDATE_BEACON;
 950
 951         spin_unlock(&intf->lock);
 952 }
 953
 954 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
 955 {
 956         int retval;
 957
 958         NOTICE(rt2x00dev, "Waking up.\n");
 959
 960         /*
 961          * Restore/enable extra components.
 962          */
 963         rt2x00debug_register(rt2x00dev);
 964         rt2x00leds_resume(rt2x00dev);
 965
 966         /*
 967          * Only continue if mac80211 had open interfaces.
 968          */
 969         if (!test_and_clear_bit(DEVICE_STATE_STARTED_SUSPEND, &rt2x00dev->flags))
 970                 return 0;
 971
 972         /*
 973          * Reinitialize device and all active interfaces.
 974          */
 975         retval = rt2x00lib_start(rt2x00dev);
 976         if (retval)
 977                 goto exit;
 978
 979         /*
 980          * Reconfigure device.
 981          */
 982         retval = rt2x00mac_config(rt2x00dev->hw, ~0);
 983         if (retval)
 984                 goto exit;
 985
 986         /*
 987          * Iterator over each active interface to
 988          * reconfigure the hardware.
 989          */
 990         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 991                                             rt2x00lib_resume_intf, rt2x00dev);
 992
 993         /*
 994          * We are ready again to receive requests from mac80211.
 995          */
 996         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 997
 998         /*
 999          * It is possible that during that mac80211 has attempted
1000          * to send frames while we were suspending or resuming.
1001          * In that case we have disabled the TX queue and should
1002          * now enable it again
1003          */
1004         ieee80211_wake_queues(rt2x00dev->hw);
1005
1006         /*
1007          * During interface iteration we might have changed the
1008          * delayed_flags, time to handles the event by calling
1009          * the work handler directly.
1010          */
1011         rt2x00lib_intf_scheduled(&rt2x00dev->intf_work);
1012
1013         return 0;
1014
1015 exit:
1016         rt2x00lib_stop(rt2x00dev);
1017         rt2x00lib_uninitialize(rt2x00dev);
1018         rt2x00debug_deregister(rt2x00dev);
1019
1020         return retval;
1021 }
1022 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1023 #endif /* CONFIG_PM */
1024
1025 /*
1026  * rt2x00lib module information.
1027  */
1028 MODULE_AUTHOR(DRV_PROJECT);
1029 MODULE_VERSION(DRV_VERSION);
1030 MODULE_DESCRIPTION("rt2x00 library");
1031 MODULE_LICENSE("GPL");