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                 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_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, true);
 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         ieee80211_queue_work(rt2x00dev->hw, &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         unsigned int header_length = ieee80211_get_hdrlen_from_skb(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          * Remove L2 padding which was added during
 239          */
 240         if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
 241                 rt2x00queue_payload_align(entry->skb, true, header_length);
 242
 243         /*
 244          * If the IV/EIV data was stripped from the frame before it was
 245          * passed to the hardware, we should now reinsert it again because
 246          * mac80211 will expect the the same data to be present it the
 247          * frame as it was passed to us.
 248          */
 249         if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
 250                 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
 251
 252         /*
 253          * Send frame to debugfs immediately, after this call is completed
 254          * we are going to overwrite the skb->cb array.
 255          */
 256         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 257
 258         /*
 259          * Update TX statistics.
 260          */
 261         rt2x00dev->link.qual.tx_success +=
 262             test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 263             test_bit(TXDONE_UNKNOWN, &txdesc->flags);
 264         rt2x00dev->link.qual.tx_failed +=
 265             test_bit(TXDONE_FAILURE, &txdesc->flags);
 266
 267         rate_idx = skbdesc->tx_rate_idx;
 268         rate_flags = skbdesc->tx_rate_flags;
 269
 270         /*
 271          * Initialize TX status
 272          */
 273         memset(&tx_info->status, 0, sizeof(tx_info->status));
 274         tx_info->status.ack_signal = 0;
 275         tx_info->status.rates[0].idx = rate_idx;
 276         tx_info->status.rates[0].flags = rate_flags;
 277         tx_info->status.rates[0].count = txdesc->retry + 1;
 278         tx_info->status.rates[1].idx = -1; /* terminate */
 279
 280         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 281                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 282                                 test_bit(TXDONE_UNKNOWN, &txdesc->flags))
 283                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 284                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 285                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 286         }
 287
 288         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 289                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 290                                 test_bit(TXDONE_UNKNOWN, &txdesc->flags))
 291                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 292                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 293                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 294         }
 295
 296         /*
 297          * Only send the status report to mac80211 when TX status was
 298          * requested by it. If this was a extra frame coming through
 299          * a mac80211 library call (RTS/CTS) then we should not send the
 300          * status report back.
 301          */
 302         if (tx_info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)
 303                 ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb);
 304         else
 305                 dev_kfree_skb_irq(entry->skb);
 306
 307         /*
 308          * Make this entry available for reuse.
 309          */
 310         entry->skb = NULL;
 311         entry->flags = 0;
 312
 313         rt2x00dev->ops->lib->clear_entry(entry);
 314
 315         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 316         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 317
 318         /*
 319          * If the data queue was below the threshold before the txdone
 320          * handler we must make sure the packet queue in the mac80211 stack
 321          * is reenabled when the txdone handler has finished.
 322          */
 323         if (!rt2x00queue_threshold(entry->queue))
 324                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 325 }
 326 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 327
 328 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 329                                         struct rxdone_entry_desc *rxdesc)
 330 {
 331         struct ieee80211_supported_band *sband;
 332         const struct rt2x00_rate *rate;
 333         unsigned int i;
 334         int signal;
 335         int type;
 336
 337         /*
 338          * For non-HT rates the MCS value needs to contain the
 339          * actually used rate modulation (CCK or OFDM).
 340          */
 341         if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 342                 signal = RATE_MCS(rxdesc->rate_mode, rxdesc->signal);
 343         else
 344                 signal = rxdesc->signal;
 345
 346         type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 347
 348         sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 349         for (i = 0; i < sband->n_bitrates; i++) {
 350                 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 351
 352                 if (((type == RXDONE_SIGNAL_PLCP) &&
 353                      (rate->plcp == signal)) ||
 354                     ((type == RXDONE_SIGNAL_BITRATE) &&
 355                       (rate->bitrate == signal)) ||
 356                     ((type == RXDONE_SIGNAL_MCS) &&
 357                       (rate->mcs == signal))) {
 358                         return i;
 359                 }
 360         }
 361
 362         WARNING(rt2x00dev, "Frame received with unrecognized signal, "
 363                 "signal=0x%.4x, type=%d.\n", signal, type);
 364         return 0;
 365 }
 366
 367 void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
 368                       struct queue_entry *entry)
 369 {
 370         struct rxdone_entry_desc rxdesc;
 371         struct sk_buff *skb;
 372         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 373         unsigned int header_length;
 374         bool l2pad;
 375         int rate_idx;
 376         /*
 377          * Allocate a new sk_buffer. If no new buffer available, drop the
 378          * received frame and reuse the existing buffer.
 379          */
 380         skb = rt2x00queue_alloc_rxskb(rt2x00dev, entry);
 381         if (!skb)
 382                 return;
 383
 384         /*
 385          * Unmap the skb.
 386          */
 387         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 388
 389         /*
 390          * Extract the RXD details.
 391          */
 392         memset(&rxdesc, 0, sizeof(rxdesc));
 393         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 394
 395         /* Trim buffer to correct size */
 396         skb_trim(entry->skb, rxdesc.size);
 397
 398         /*
 399          * The data behind the ieee80211 header must be
 400          * aligned on a 4 byte boundary.
 401          */
 402         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 403         l2pad = !!(rxdesc.dev_flags & RXDONE_L2PAD);
 404
 405         /*
 406          * Hardware might have stripped the IV/EIV/ICV data,
 407          * in that case it is possible that the data was
 408          * provided seperately (through hardware descriptor)
 409          * in which case we should reinsert the data into the frame.
 410          */
 411         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 412             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 413                 rt2x00crypto_rx_insert_iv(entry->skb, l2pad, header_length,
 414                                           &rxdesc);
 415         else
 416                 rt2x00queue_payload_align(entry->skb, l2pad, header_length);
 417
 418         /*
 419          * Check if the frame was received using HT. In that case,
 420          * the rate is the MCS index and should be passed to mac80211
 421          * directly. Otherwise we need to translate the signal to
 422          * the correct bitrate index.
 423          */
 424         if (rxdesc.rate_mode == RATE_MODE_CCK ||
 425             rxdesc.rate_mode == RATE_MODE_OFDM) {
 426                 rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 427         } else {
 428                 rxdesc.flags |= RX_FLAG_HT;
 429                 rate_idx = rxdesc.signal;
 430         }
 431
 432         /*
 433          * Update extra components
 434          */
 435         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 436         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 437
 438         rx_status->mactime = rxdesc.timestamp;
 439         rx_status->rate_idx = rate_idx;
 440         rx_status->qual = rt2x00link_calculate_signal(rt2x00dev, rxdesc.rssi);
 441         rx_status->signal = rxdesc.rssi;
 442         rx_status->noise = rxdesc.noise;
 443         rx_status->flag = rxdesc.flags;
 444         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 445
 446         /*
 447          * Send frame to mac80211 & debugfs.
 448          * mac80211 will clean up the skb structure.
 449          */
 450         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 451         memcpy(IEEE80211_SKB_RXCB(entry->skb), rx_status, sizeof(*rx_status));
 452         ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb);
 453
 454         /*
 455          * Replace the skb with the freshly allocated one.
 456          */
 457         entry->skb = skb;
 458         entry->flags = 0;
 459
 460         rt2x00dev->ops->lib->clear_entry(entry);
 461
 462         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 463 }
 464 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 465
 466 /*
 467  * Driver initialization handlers.
 468  */
 469 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 470         {
 471                 .flags = DEV_RATE_CCK,
 472                 .bitrate = 10,
 473                 .ratemask = BIT(0),
 474                 .plcp = 0x00,
 475                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 476         },
 477         {
 478                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 479                 .bitrate = 20,
 480                 .ratemask = BIT(1),
 481                 .plcp = 0x01,
 482                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 483         },
 484         {
 485                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 486                 .bitrate = 55,
 487                 .ratemask = BIT(2),
 488                 .plcp = 0x02,
 489                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 490         },
 491         {
 492                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 493                 .bitrate = 110,
 494                 .ratemask = BIT(3),
 495                 .plcp = 0x03,
 496                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 497         },
 498         {
 499                 .flags = DEV_RATE_OFDM,
 500                 .bitrate = 60,
 501                 .ratemask = BIT(4),
 502                 .plcp = 0x0b,
 503                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 504         },
 505         {
 506                 .flags = DEV_RATE_OFDM,
 507                 .bitrate = 90,
 508                 .ratemask = BIT(5),
 509                 .plcp = 0x0f,
 510                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 511         },
 512         {
 513                 .flags = DEV_RATE_OFDM,
 514                 .bitrate = 120,
 515                 .ratemask = BIT(6),
 516                 .plcp = 0x0a,
 517                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 518         },
 519         {
 520                 .flags = DEV_RATE_OFDM,
 521                 .bitrate = 180,
 522                 .ratemask = BIT(7),
 523                 .plcp = 0x0e,
 524                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 525         },
 526         {
 527                 .flags = DEV_RATE_OFDM,
 528                 .bitrate = 240,
 529                 .ratemask = BIT(8),
 530                 .plcp = 0x09,
 531                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 532         },
 533         {
 534                 .flags = DEV_RATE_OFDM,
 535                 .bitrate = 360,
 536                 .ratemask = BIT(9),
 537                 .plcp = 0x0d,
 538                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 539         },
 540         {
 541                 .flags = DEV_RATE_OFDM,
 542                 .bitrate = 480,
 543                 .ratemask = BIT(10),
 544                 .plcp = 0x08,
 545                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 546         },
 547         {
 548                 .flags = DEV_RATE_OFDM,
 549                 .bitrate = 540,
 550                 .ratemask = BIT(11),
 551                 .plcp = 0x0c,
 552                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 553         },
 554 };
 555
 556 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 557                               const int channel, const int tx_power,
 558                               const int value)
 559 {
 560         entry->center_freq = ieee80211_channel_to_frequency(channel);
 561         entry->hw_value = value;
 562         entry->max_power = tx_power;
 563         entry->max_antenna_gain = 0xff;
 564 }
 565
 566 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 567                            const u16 index, const struct rt2x00_rate *rate)
 568 {
 569         entry->flags = 0;
 570         entry->bitrate = rate->bitrate;
 571         entry->hw_value =index;
 572         entry->hw_value_short = index;
 573
 574         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 575                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 576 }
 577
 578 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 579                                     struct hw_mode_spec *spec)
 580 {
 581         struct ieee80211_hw *hw = rt2x00dev->hw;
 582         struct ieee80211_channel *channels;
 583         struct ieee80211_rate *rates;
 584         unsigned int num_rates;
 585         unsigned int i;
 586
 587         num_rates = 0;
 588         if (spec->supported_rates & SUPPORT_RATE_CCK)
 589                 num_rates += 4;
 590         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 591                 num_rates += 8;
 592
 593         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 594         if (!channels)
 595                 return -ENOMEM;
 596
 597         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 598         if (!rates)
 599                 goto exit_free_channels;
 600
 601         /*
 602          * Initialize Rate list.
 603          */
 604         for (i = 0; i < num_rates; i++)
 605                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 606
 607         /*
 608          * Initialize Channel list.
 609          */
 610         for (i = 0; i < spec->num_channels; i++) {
 611                 rt2x00lib_channel(&channels[i],
 612                                   spec->channels[i].channel,
 613                                   spec->channels_info[i].tx_power1, i);
 614         }
 615
 616         /*
 617          * Intitialize 802.11b, 802.11g
 618          * Rates: CCK, OFDM.
 619          * Channels: 2.4 GHz
 620          */
 621         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 622                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 623                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 624                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 625                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 626                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 627                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 628                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
 629                        &spec->ht, sizeof(spec->ht));
 630         }
 631
 632         /*
 633          * Intitialize 802.11a
 634          * Rates: OFDM.
 635          * Channels: OFDM, UNII, HiperLAN2.
 636          */
 637         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 638                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 639                     spec->num_channels - 14;
 640                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 641                     num_rates - 4;
 642                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 643                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 644                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 645                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 646                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
 647                        &spec->ht, sizeof(spec->ht));
 648         }
 649
 650         return 0;
 651
 652  exit_free_channels:
 653         kfree(channels);
 654         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 655         return -ENOMEM;
 656 }
 657
 658 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 659 {
 660         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 661                 ieee80211_unregister_hw(rt2x00dev->hw);
 662
 663         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 664                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 665                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 666                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 667                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 668         }
 669
 670         kfree(rt2x00dev->spec.channels_info);
 671 }
 672
 673 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 674 {
 675         struct hw_mode_spec *spec = &rt2x00dev->spec;
 676         int status;
 677
 678         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 679                 return 0;
 680
 681         /*
 682          * Initialize HW modes.
 683          */
 684         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 685         if (status)
 686                 return status;
 687
 688         /*
 689          * Initialize HW fields.
 690          */
 691         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 692
 693         /*
 694          * Register HW.
 695          */
 696         status = ieee80211_register_hw(rt2x00dev->hw);
 697         if (status)
 698                 return status;
 699
 700         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 701
 702         return 0;
 703 }
 704
 705 /*
 706  * Initialization/uninitialization handlers.
 707  */
 708 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 709 {
 710         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 711                 return;
 712
 713         /*
 714          * Unregister extra components.
 715          */
 716         rt2x00rfkill_unregister(rt2x00dev);
 717
 718         /*
 719          * Allow the HW to uninitialize.
 720          */
 721         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 722
 723         /*
 724          * Free allocated queue entries.
 725          */
 726         rt2x00queue_uninitialize(rt2x00dev);
 727 }
 728
 729 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 730 {
 731         int status;
 732
 733         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 734                 return 0;
 735
 736         /*
 737          * Allocate all queue entries.
 738          */
 739         status = rt2x00queue_initialize(rt2x00dev);
 740         if (status)
 741                 return status;
 742
 743         /*
 744          * Initialize the device.
 745          */
 746         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 747         if (status) {
 748                 rt2x00queue_uninitialize(rt2x00dev);
 749                 return status;
 750         }
 751
 752         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
 753
 754         /*
 755          * Register the extra components.
 756          */
 757         rt2x00rfkill_register(rt2x00dev);
 758
 759         return 0;
 760 }
 761
 762 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 763 {
 764         int retval;
 765
 766         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 767                 return 0;
 768
 769         /*
 770          * If this is the first interface which is added,
 771          * we should load the firmware now.
 772          */
 773         retval = rt2x00lib_load_firmware(rt2x00dev);
 774         if (retval)
 775                 return retval;
 776
 777         /*
 778          * Initialize the device.
 779          */
 780         retval = rt2x00lib_initialize(rt2x00dev);
 781         if (retval)
 782                 return retval;
 783
 784         rt2x00dev->intf_ap_count = 0;
 785         rt2x00dev->intf_sta_count = 0;
 786         rt2x00dev->intf_associated = 0;
 787
 788         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
 789
 790         return 0;
 791 }
 792
 793 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
 794 {
 795         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 796                 return;
 797
 798         /*
 799          * Perhaps we can add something smarter here,
 800          * but for now just disabling the radio should do.
 801          */
 802         rt2x00lib_disable_radio(rt2x00dev);
 803
 804         rt2x00dev->intf_ap_count = 0;
 805         rt2x00dev->intf_sta_count = 0;
 806         rt2x00dev->intf_associated = 0;
 807 }
 808
 809 /*
 810  * driver allocation handlers.
 811  */
 812 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 813 {
 814         int retval = -ENOMEM;
 815
 816         mutex_init(&rt2x00dev->csr_mutex);
 817
 818         /*
 819          * Make room for rt2x00_intf inside the per-interface
 820          * structure ieee80211_vif.
 821          */
 822         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
 823
 824         /*
 825          * Determine which operating modes are supported, all modes
 826          * which require beaconing, depend on the availability of
 827          * beacon entries.
 828          */
 829         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
 830         if (rt2x00dev->ops->bcn->entry_num > 0)
 831                 rt2x00dev->hw->wiphy->interface_modes |=
 832                     BIT(NL80211_IFTYPE_ADHOC) |
 833                     BIT(NL80211_IFTYPE_AP) |
 834                     BIT(NL80211_IFTYPE_MESH_POINT) |
 835                     BIT(NL80211_IFTYPE_WDS);
 836
 837         /*
 838          * Let the driver probe the device to detect the capabilities.
 839          */
 840         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
 841         if (retval) {
 842                 ERROR(rt2x00dev, "Failed to allocate device.\n");
 843                 goto exit;
 844         }
 845
 846         /*
 847          * Initialize configuration work.
 848          */
 849         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
 850         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
 851
 852         /*
 853          * Allocate queue array.
 854          */
 855         retval = rt2x00queue_allocate(rt2x00dev);
 856         if (retval)
 857                 goto exit;
 858
 859         /*
 860          * Initialize ieee80211 structure.
 861          */
 862         retval = rt2x00lib_probe_hw(rt2x00dev);
 863         if (retval) {
 864                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
 865                 goto exit;
 866         }
 867
 868         /*
 869          * Register extra components.
 870          */
 871         rt2x00link_register(rt2x00dev);
 872         rt2x00leds_register(rt2x00dev);
 873         rt2x00debug_register(rt2x00dev);
 874
 875         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 876
 877         return 0;
 878
 879 exit:
 880         rt2x00lib_remove_dev(rt2x00dev);
 881
 882         return retval;
 883 }
 884 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
 885
 886 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
 887 {
 888         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 889
 890         /*
 891          * Disable radio.
 892          */
 893         rt2x00lib_disable_radio(rt2x00dev);
 894
 895         /*
 896          * Stop all work.
 897          */
 898         cancel_work_sync(&rt2x00dev->filter_work);
 899         cancel_work_sync(&rt2x00dev->intf_work);
 900
 901         /*
 902          * Uninitialize device.
 903          */
 904         rt2x00lib_uninitialize(rt2x00dev);
 905
 906         /*
 907          * Free extra components
 908          */
 909         rt2x00debug_deregister(rt2x00dev);
 910         rt2x00leds_unregister(rt2x00dev);
 911
 912         /*
 913          * Free ieee80211_hw memory.
 914          */
 915         rt2x00lib_remove_hw(rt2x00dev);
 916
 917         /*
 918          * Free firmware image.
 919          */
 920         rt2x00lib_free_firmware(rt2x00dev);
 921
 922         /*
 923          * Free queue structures.
 924          */
 925         rt2x00queue_free(rt2x00dev);
 926 }
 927 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
 928
 929 /*
 930  * Device state handlers
 931  */
 932 #ifdef CONFIG_PM
 933 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
 934 {
 935         NOTICE(rt2x00dev, "Going to sleep.\n");
 936
 937         /*
 938          * Prevent mac80211 from accessing driver while suspended.
 939          */
 940         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 941                 return 0;
 942
 943         /*
 944          * Cleanup as much as possible.
 945          */
 946         rt2x00lib_uninitialize(rt2x00dev);
 947
 948         /*
 949          * Suspend/disable extra components.
 950          */
 951         rt2x00leds_suspend(rt2x00dev);
 952         rt2x00debug_deregister(rt2x00dev);
 953
 954         /*
 955          * Set device mode to sleep for power management,
 956          * on some hardware this call seems to consistently fail.
 957          * From the specifications it is hard to tell why it fails,
 958          * and if this is a "bad thing".
 959          * Overall it is safe to just ignore the failure and
 960          * continue suspending. The only downside is that the
 961          * device will not be in optimal power save mode, but with
 962          * the radio and the other components already disabled the
 963          * device is as good as disabled.
 964          */
 965         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
 966                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
 967                         "continue suspending.\n");
 968
 969         return 0;
 970 }
 971 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
 972
 973 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
 974 {
 975         NOTICE(rt2x00dev, "Waking up.\n");
 976
 977         /*
 978          * Restore/enable extra components.
 979          */
 980         rt2x00debug_register(rt2x00dev);
 981         rt2x00leds_resume(rt2x00dev);
 982
 983         /*
 984          * We are ready again to receive requests from mac80211.
 985          */
 986         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 987
 988         return 0;
 989 }
 990 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
 991 #endif /* CONFIG_PM */
 992
 993 /*
 994  * rt2x00lib module information.
 995  */
 996 MODULE_AUTHOR(DRV_PROJECT);
 997 MODULE_VERSION(DRV_VERSION);
 998 MODULE_DESCRIPTION("rt2x00 library");
 999 MODULE_LICENSE("GPL");