git.oblomov.eu Git - linux-2.6/blob - 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 in mac80211.
  87          */
  88         ieee80211_stop_queues(rt2x00dev->hw);
  89         rt2x00queue_stop_queues(rt2x00dev);
  90
  91         /*
  92          * Disable RX.
  93          */
  94         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
  95
  96         /*
  97          * Disable radio.
  98          */
  99         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 100         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 101         rt2x00led_led_activity(rt2x00dev, false);
 102         rt2x00leds_led_radio(rt2x00dev, false);
 103 }
 104
 105 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 106 {
 107         /*
 108          * When we are disabling the RX, we should also stop the link tuner.
 109          */
 110         if (state == STATE_RADIO_RX_OFF)
 111                 rt2x00link_stop_tuner(rt2x00dev);
 112
 113         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 114
 115         /*
 116          * When we are enabling the RX, we should also start the link tuner.
 117          */
 118         if (state == STATE_RADIO_RX_ON)
 119                 rt2x00link_start_tuner(rt2x00dev);
 120 }
 121
 122 static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
 123 {
 124         struct rt2x00_dev *rt2x00dev =
 125             container_of(work, struct rt2x00_dev, filter_work);
 126
 127         rt2x00dev->ops->lib->config_filter(rt2x00dev, rt2x00dev->packet_filter);
 128 }
 129
 130 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 131                                           struct ieee80211_vif *vif)
 132 {
 133         struct rt2x00_dev *rt2x00dev = data;
 134         struct rt2x00_intf *intf = vif_to_intf(vif);
 135         struct ieee80211_bss_conf conf;
 136         int delayed_flags;
 137
 138         /*
 139          * Copy all data we need during this action under the protection
 140          * of a spinlock. Otherwise race conditions might occur which results
 141          * into an invalid configuration.
 142          */
 143         spin_lock(&intf->lock);
 144
 145         memcpy(&conf, &vif->bss_conf, sizeof(conf));
 146         delayed_flags = intf->delayed_flags;
 147         intf->delayed_flags = 0;
 148
 149         spin_unlock(&intf->lock);
 150
 151         /*
 152          * It is possible the radio was disabled while the work had been
 153          * scheduled. If that happens we should return here immediately,
 154          * note that in the spinlock protected area above the delayed_flags
 155          * have been cleared correctly.
 156          */
 157         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 158                 return;
 159
 160         if (delayed_flags & DELAYED_UPDATE_BEACON)
 161                 rt2x00queue_update_beacon(rt2x00dev, vif, true);
 162
 163         if (delayed_flags & DELAYED_CONFIG_ERP)
 164                 rt2x00lib_config_erp(rt2x00dev, intf, &conf);
 165
 166         if (delayed_flags & DELAYED_LED_ASSOC)
 167                 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
 168 }
 169
 170 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 171 {
 172         struct rt2x00_dev *rt2x00dev =
 173             container_of(work, struct rt2x00_dev, intf_work);
 174
 175         /*
 176          * Iterate over each interface and perform the
 177          * requested configurations.
 178          */
 179         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 180                                             rt2x00lib_intf_scheduled_iter,
 181                                             rt2x00dev);
 182 }
 183
 184 /*
 185  * Interrupt context handlers.
 186  */
 187 static void rt2x00lib_beacondone_iter(void *data, u8 *mac,
 188                                       struct ieee80211_vif *vif)
 189 {
 190         struct rt2x00_dev *rt2x00dev = data;
 191         struct rt2x00_intf *intf = vif_to_intf(vif);
 192
 193         if (vif->type != NL80211_IFTYPE_AP &&
 194             vif->type != NL80211_IFTYPE_ADHOC &&
 195             vif->type != NL80211_IFTYPE_MESH_POINT &&
 196             vif->type != NL80211_IFTYPE_WDS)
 197                 return;
 198
 199         /*
 200          * Clean up the beacon skb.
 201          */
 202         rt2x00queue_free_skb(rt2x00dev, intf->beacon->skb);
 203         intf->beacon->skb = NULL;
 204
 205         spin_lock(&intf->lock);
 206         intf->delayed_flags |= DELAYED_UPDATE_BEACON;
 207         spin_unlock(&intf->lock);
 208 }
 209
 210 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 211 {
 212         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 213                 return;
 214
 215         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 216                                                    rt2x00lib_beacondone_iter,
 217                                                    rt2x00dev);
 218
 219         queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->intf_work);
 220 }
 221 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 222
 223 void rt2x00lib_txdone(struct queue_entry *entry,
 224                       struct txdone_entry_desc *txdesc)
 225 {
 226         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 227         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 228         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 229         enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
 230         u8 rate_idx, rate_flags;
 231
 232         /*
 233          * Unmap the skb.
 234          */
 235         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 236
 237         /*
 238          * If the IV/EIV data was stripped from the frame before it was
 239          * passed to the hardware, we should now reinsert it again because
 240          * mac80211 will expect the the same data to be present it the
 241          * frame as it was passed to us.
 242          */
 243         if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
 244                 rt2x00crypto_tx_insert_iv(entry->skb);
 245
 246         /*
 247          * Send frame to debugfs immediately, after this call is completed
 248          * we are going to overwrite the skb->cb array.
 249          */
 250         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 251
 252         /*
 253          * Update TX statistics.
 254          */
 255         rt2x00dev->link.qual.tx_success +=
 256             test_bit(TXDONE_SUCCESS, &txdesc->flags);
 257         rt2x00dev->link.qual.tx_failed +=
 258             test_bit(TXDONE_FAILURE, &txdesc->flags);
 259
 260         rate_idx = skbdesc->tx_rate_idx;
 261         rate_flags = skbdesc->tx_rate_flags;
 262
 263         /*
 264          * Initialize TX status
 265          */
 266         memset(&tx_info->status, 0, sizeof(tx_info->status));
 267         tx_info->status.ack_signal = 0;
 268         tx_info->status.rates[0].idx = rate_idx;
 269         tx_info->status.rates[0].flags = rate_flags;
 270         tx_info->status.rates[0].count = txdesc->retry + 1;
 271         tx_info->status.rates[1].idx = -1; /* terminate */
 272
 273         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 274                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 275                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 276                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 277                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 278         }
 279
 280         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 281                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 282                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 283                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 284                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 285         }
 286
 287         /*
 288          * Only send the status report to mac80211 when TX status was
 289          * requested by it. If this was a extra frame coming through
 290          * a mac80211 library call (RTS/CTS) then we should not send the
 291          * status report back.
 292          */
 293         if (tx_info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)
 294                 ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb);
 295         else
 296                 dev_kfree_skb_irq(entry->skb);
 297
 298         /*
 299          * Make this entry available for reuse.
 300          */
 301         entry->skb = NULL;
 302         entry->flags = 0;
 303
 304         rt2x00dev->ops->lib->clear_entry(entry);
 305
 306         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 307         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 308
 309         /*
 310          * If the data queue was below the threshold before the txdone
 311          * handler we must make sure the packet queue in the mac80211 stack
 312          * is reenabled when the txdone handler has finished.
 313          */
 314         if (!rt2x00queue_threshold(entry->queue))
 315                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 316 }
 317 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 318
 319 void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
 320                       struct queue_entry *entry)
 321 {
 322         struct rxdone_entry_desc rxdesc;
 323         struct sk_buff *skb;
 324         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 325         struct ieee80211_supported_band *sband;
 326         const struct rt2x00_rate *rate;
 327         unsigned int header_length;
 328         unsigned int align;
 329         unsigned int i;
 330         int idx = -1;
 331
 332         /*
 333          * Allocate a new sk_buffer. If no new buffer available, drop the
 334          * received frame and reuse the existing buffer.
 335          */
 336         skb = rt2x00queue_alloc_rxskb(rt2x00dev, entry);
 337         if (!skb)
 338                 return;
 339
 340         /*
 341          * Unmap the skb.
 342          */
 343         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 344
 345         /*
 346          * Extract the RXD details.
 347          */
 348         memset(&rxdesc, 0, sizeof(rxdesc));
 349         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 350
 351         /*
 352          * The data behind the ieee80211 header must be
 353          * aligned on a 4 byte boundary.
 354          */
 355         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 356         align = ((unsigned long)(entry->skb->data + header_length)) & 3;
 357
 358         /*
 359          * Hardware might have stripped the IV/EIV/ICV data,
 360          * in that case it is possible that the data was
 361          * provided seperately (through hardware descriptor)
 362          * in which case we should reinsert the data into the frame.
 363          */
 364         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 365             (rxdesc.flags & RX_FLAG_IV_STRIPPED)) {
 366                 rt2x00crypto_rx_insert_iv(entry->skb, align,
 367                                           header_length, &rxdesc);
 368         } else if (align) {
 369                 skb_push(entry->skb, align);
 370                 /* Move entire frame in 1 command */
 371                 memmove(entry->skb->data, entry->skb->data + align,
 372                         rxdesc.size);
 373         }
 374
 375         /* Update data pointers, trim buffer to correct size */
 376         skb_trim(entry->skb, rxdesc.size);
 377
 378         /*
 379          * Update RX statistics.
 380          */
 381         sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 382         for (i = 0; i < sband->n_bitrates; i++) {
 383                 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 384
 385                 if (((rxdesc.dev_flags & RXDONE_SIGNAL_PLCP) &&
 386                      (rate->plcp == rxdesc.signal)) ||
 387                     ((rxdesc.dev_flags & RXDONE_SIGNAL_BITRATE) &&
 388                       (rate->bitrate == rxdesc.signal))) {
 389                         idx = i;
 390                         break;
 391                 }
 392         }
 393
 394         if (idx < 0) {
 395                 WARNING(rt2x00dev, "Frame received with unrecognized signal,"
 396                         "signal=0x%.2x, type=%d.\n", rxdesc.signal,
 397                         (rxdesc.dev_flags & RXDONE_SIGNAL_MASK));
 398                 idx = 0;
 399         }
 400
 401         /*
 402          * Update extra components
 403          */
 404         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 405         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 406
 407         rx_status->mactime = rxdesc.timestamp;
 408         rx_status->rate_idx = idx;
 409         rx_status->qual = rt2x00link_calculate_signal(rt2x00dev, rxdesc.rssi);
 410         rx_status->signal = rxdesc.rssi;
 411         rx_status->noise = rxdesc.noise;
 412         rx_status->flag = rxdesc.flags;
 413         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 414
 415         /*
 416          * Send frame to mac80211 & debugfs.
 417          * mac80211 will clean up the skb structure.
 418          */
 419         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 420         ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb, rx_status);
 421
 422         /*
 423          * Replace the skb with the freshly allocated one.
 424          */
 425         entry->skb = skb;
 426         entry->flags = 0;
 427
 428         rt2x00dev->ops->lib->clear_entry(entry);
 429
 430         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 431 }
 432 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 433
 434 /*
 435  * Driver initialization handlers.
 436  */
 437 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 438         {
 439                 .flags = DEV_RATE_CCK,
 440                 .bitrate = 10,
 441                 .ratemask = BIT(0),
 442                 .plcp = 0x00,
 443         },
 444         {
 445                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 446                 .bitrate = 20,
 447                 .ratemask = BIT(1),
 448                 .plcp = 0x01,
 449         },
 450         {
 451                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 452                 .bitrate = 55,
 453                 .ratemask = BIT(2),
 454                 .plcp = 0x02,
 455         },
 456         {
 457                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 458                 .bitrate = 110,
 459                 .ratemask = BIT(3),
 460                 .plcp = 0x03,
 461         },
 462         {
 463                 .flags = DEV_RATE_OFDM,
 464                 .bitrate = 60,
 465                 .ratemask = BIT(4),
 466                 .plcp = 0x0b,
 467         },
 468         {
 469                 .flags = DEV_RATE_OFDM,
 470                 .bitrate = 90,
 471                 .ratemask = BIT(5),
 472                 .plcp = 0x0f,
 473         },
 474         {
 475                 .flags = DEV_RATE_OFDM,
 476                 .bitrate = 120,
 477                 .ratemask = BIT(6),
 478                 .plcp = 0x0a,
 479         },
 480         {
 481                 .flags = DEV_RATE_OFDM,
 482                 .bitrate = 180,
 483                 .ratemask = BIT(7),
 484                 .plcp = 0x0e,
 485         },
 486         {
 487                 .flags = DEV_RATE_OFDM,
 488                 .bitrate = 240,
 489                 .ratemask = BIT(8),
 490                 .plcp = 0x09,
 491         },
 492         {
 493                 .flags = DEV_RATE_OFDM,
 494                 .bitrate = 360,
 495                 .ratemask = BIT(9),
 496                 .plcp = 0x0d,
 497         },
 498         {
 499                 .flags = DEV_RATE_OFDM,
 500                 .bitrate = 480,
 501                 .ratemask = BIT(10),
 502                 .plcp = 0x08,
 503         },
 504         {
 505                 .flags = DEV_RATE_OFDM,
 506                 .bitrate = 540,
 507                 .ratemask = BIT(11),
 508                 .plcp = 0x0c,
 509         },
 510 };
 511
 512 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 513                               const int channel, const int tx_power,
 514                               const int value)
 515 {
 516         entry->center_freq = ieee80211_channel_to_frequency(channel);
 517         entry->hw_value = value;
 518         entry->max_power = tx_power;
 519         entry->max_antenna_gain = 0xff;
 520 }
 521
 522 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 523                            const u16 index, const struct rt2x00_rate *rate)
 524 {
 525         entry->flags = 0;
 526         entry->bitrate = rate->bitrate;
 527         entry->hw_value =index;
 528         entry->hw_value_short = index;
 529
 530         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 531                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 532 }
 533
 534 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 535                                     struct hw_mode_spec *spec)
 536 {
 537         struct ieee80211_hw *hw = rt2x00dev->hw;
 538         struct ieee80211_channel *channels;
 539         struct ieee80211_rate *rates;
 540         unsigned int num_rates;
 541         unsigned int i;
 542
 543         num_rates = 0;
 544         if (spec->supported_rates & SUPPORT_RATE_CCK)
 545                 num_rates += 4;
 546         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 547                 num_rates += 8;
 548
 549         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 550         if (!channels)
 551                 return -ENOMEM;
 552
 553         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 554         if (!rates)
 555                 goto exit_free_channels;
 556
 557         /*
 558          * Initialize Rate list.
 559          */
 560         for (i = 0; i < num_rates; i++)
 561                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 562
 563         /*
 564          * Initialize Channel list.
 565          */
 566         for (i = 0; i < spec->num_channels; i++) {
 567                 rt2x00lib_channel(&channels[i],
 568                                   spec->channels[i].channel,
 569                                   spec->channels_info[i].tx_power1, i);
 570         }
 571
 572         /*
 573          * Intitialize 802.11b, 802.11g
 574          * Rates: CCK, OFDM.
 575          * Channels: 2.4 GHz
 576          */
 577         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 578                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 579                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 580                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 581                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 582                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 583                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 584         }
 585
 586         /*
 587          * Intitialize 802.11a
 588          * Rates: OFDM.
 589          * Channels: OFDM, UNII, HiperLAN2.
 590          */
 591         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 592                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 593                     spec->num_channels - 14;
 594                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 595                     num_rates - 4;
 596                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 597                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 598                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 599                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 600         }
 601
 602         return 0;
 603
 604  exit_free_channels:
 605         kfree(channels);
 606         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 607         return -ENOMEM;
 608 }
 609
 610 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 611 {
 612         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 613                 ieee80211_unregister_hw(rt2x00dev->hw);
 614
 615         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 616                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 617                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 618                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 619                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 620         }
 621
 622         kfree(rt2x00dev->spec.channels_info);
 623 }
 624
 625 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 626 {
 627         struct hw_mode_spec *spec = &rt2x00dev->spec;
 628         int status;
 629
 630         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 631                 return 0;
 632
 633         /*
 634          * Initialize HW modes.
 635          */
 636         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 637         if (status)
 638                 return status;
 639
 640         /*
 641          * Initialize HW fields.
 642          */
 643         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 644
 645         /*
 646          * Register HW.
 647          */
 648         status = ieee80211_register_hw(rt2x00dev->hw);
 649         if (status) {
 650                 rt2x00lib_remove_hw(rt2x00dev);
 651                 return status;
 652         }
 653
 654         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 655
 656         return 0;
 657 }
 658
 659 /*
 660  * Initialization/uninitialization handlers.
 661  */
 662 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 663 {
 664         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 665                 return;
 666
 667         /*
 668          * Unregister extra components.
 669          */
 670         rt2x00rfkill_unregister(rt2x00dev);
 671
 672         /*
 673          * Allow the HW to uninitialize.
 674          */
 675         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 676
 677         /*
 678          * Free allocated queue entries.
 679          */
 680         rt2x00queue_uninitialize(rt2x00dev);
 681 }
 682
 683 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 684 {
 685         int status;
 686
 687         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 688                 return 0;
 689
 690         /*
 691          * Allocate all queue entries.
 692          */
 693         status = rt2x00queue_initialize(rt2x00dev);
 694         if (status)
 695                 return status;
 696
 697         /*
 698          * Initialize the device.
 699          */
 700         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 701         if (status) {
 702                 rt2x00queue_uninitialize(rt2x00dev);
 703                 return status;
 704         }
 705
 706         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
 707
 708         /*
 709          * Register the extra components.
 710          */
 711         rt2x00rfkill_register(rt2x00dev);
 712
 713         return 0;
 714 }
 715
 716 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 717 {
 718         int retval;
 719
 720         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 721                 return 0;
 722
 723         /*
 724          * If this is the first interface which is added,
 725          * we should load the firmware now.
 726          */
 727         retval = rt2x00lib_load_firmware(rt2x00dev);
 728         if (retval)
 729                 return retval;
 730
 731         /*
 732          * Initialize the device.
 733          */
 734         retval = rt2x00lib_initialize(rt2x00dev);
 735         if (retval)
 736                 return retval;
 737
 738         rt2x00dev->intf_ap_count = 0;
 739         rt2x00dev->intf_sta_count = 0;
 740         rt2x00dev->intf_associated = 0;
 741
 742         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
 743
 744         return 0;
 745 }
 746
 747 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
 748 {
 749         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 750                 return;
 751
 752         /*
 753          * Perhaps we can add something smarter here,
 754          * but for now just disabling the radio should do.
 755          */
 756         rt2x00lib_disable_radio(rt2x00dev);
 757
 758         rt2x00dev->intf_ap_count = 0;
 759         rt2x00dev->intf_sta_count = 0;
 760         rt2x00dev->intf_associated = 0;
 761 }
 762
 763 /*
 764  * driver allocation handlers.
 765  */
 766 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 767 {
 768         int retval = -ENOMEM;
 769
 770         mutex_init(&rt2x00dev->csr_mutex);
 771
 772         /*
 773          * Make room for rt2x00_intf inside the per-interface
 774          * structure ieee80211_vif.
 775          */
 776         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
 777
 778         /*
 779          * Determine which operating modes are supported, all modes
 780          * which require beaconing, depend on the availability of
 781          * beacon entries.
 782          */
 783         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
 784         if (rt2x00dev->ops->bcn->entry_num > 0)
 785                 rt2x00dev->hw->wiphy->interface_modes |=
 786                     BIT(NL80211_IFTYPE_ADHOC) |
 787                     BIT(NL80211_IFTYPE_AP) |
 788                     BIT(NL80211_IFTYPE_MESH_POINT) |
 789                     BIT(NL80211_IFTYPE_WDS);
 790
 791         /*
 792          * Let the driver probe the device to detect the capabilities.
 793          */
 794         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
 795         if (retval) {
 796                 ERROR(rt2x00dev, "Failed to allocate device.\n");
 797                 goto exit;
 798         }
 799
 800         /*
 801          * Initialize configuration work.
 802          */
 803         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
 804         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
 805
 806         /*
 807          * Allocate queue array.
 808          */
 809         retval = rt2x00queue_allocate(rt2x00dev);
 810         if (retval)
 811                 goto exit;
 812
 813         /*
 814          * Initialize ieee80211 structure.
 815          */
 816         retval = rt2x00lib_probe_hw(rt2x00dev);
 817         if (retval) {
 818                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
 819                 goto exit;
 820         }
 821
 822         /*
 823          * Register extra components.
 824          */
 825         rt2x00link_register(rt2x00dev);
 826         rt2x00leds_register(rt2x00dev);
 827         rt2x00rfkill_allocate(rt2x00dev);
 828         rt2x00debug_register(rt2x00dev);
 829
 830         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 831
 832         return 0;
 833
 834 exit:
 835         rt2x00lib_remove_dev(rt2x00dev);
 836
 837         return retval;
 838 }
 839 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
 840
 841 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
 842 {
 843         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 844
 845         /*
 846          * Disable radio.
 847          */
 848         rt2x00lib_disable_radio(rt2x00dev);
 849
 850         /*
 851          * Uninitialize device.
 852          */
 853         rt2x00lib_uninitialize(rt2x00dev);
 854
 855         /*
 856          * Free extra components
 857          */
 858         rt2x00debug_deregister(rt2x00dev);
 859         rt2x00rfkill_free(rt2x00dev);
 860         rt2x00leds_unregister(rt2x00dev);
 861
 862         /*
 863          * Free ieee80211_hw memory.
 864          */
 865         rt2x00lib_remove_hw(rt2x00dev);
 866
 867         /*
 868          * Free firmware image.
 869          */
 870         rt2x00lib_free_firmware(rt2x00dev);
 871
 872         /*
 873          * Free queue structures.
 874          */
 875         rt2x00queue_free(rt2x00dev);
 876 }
 877 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
 878
 879 /*
 880  * Device state handlers
 881  */
 882 #ifdef CONFIG_PM
 883 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
 884 {
 885         NOTICE(rt2x00dev, "Going to sleep.\n");
 886
 887         /*
 888          * Prevent mac80211 from accessing driver while suspended.
 889          */
 890         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 891                 return 0;
 892
 893         /*
 894          * Cleanup as much as possible.
 895          */
 896         rt2x00lib_uninitialize(rt2x00dev);
 897
 898         /*
 899          * Suspend/disable extra components.
 900          */
 901         rt2x00leds_suspend(rt2x00dev);
 902         rt2x00debug_deregister(rt2x00dev);
 903
 904         /*
 905          * Set device mode to sleep for power management,
 906          * on some hardware this call seems to consistently fail.
 907          * From the specifications it is hard to tell why it fails,
 908          * and if this is a "bad thing".
 909          * Overall it is safe to just ignore the failure and
 910          * continue suspending. The only downside is that the
 911          * device will not be in optimal power save mode, but with
 912          * the radio and the other components already disabled the
 913          * device is as good as disabled.
 914          */
 915         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
 916                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
 917                         "continue suspending.\n");
 918
 919         return 0;
 920 }
 921 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
 922
 923 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
 924 {
 925         NOTICE(rt2x00dev, "Waking up.\n");
 926
 927         /*
 928          * Restore/enable extra components.
 929          */
 930         rt2x00debug_register(rt2x00dev);
 931         rt2x00leds_resume(rt2x00dev);
 932
 933         /*
 934          * We are ready again to receive requests from mac80211.
 935          */
 936         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 937
 938         return 0;
 939 }
 940 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
 941 #endif /* CONFIG_PM */
 942
 943 /*
 944  * rt2x00lib module information.
 945  */
 946 MODULE_AUTHOR(DRV_PROJECT);
 947 MODULE_VERSION(DRV_VERSION);
 948 MODULE_DESCRIPTION("rt2x00 library");
 949 MODULE_LICENSE("GPL");