drivers/net/wireless/rt2x00/rt2x00dev.c

   1 /*
   2         Copyright (C) 2010 Willow Garage <http://www.willowgarage.com>
   3         Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
   4         <http://rt2x00.serialmonkey.com>
   5
   6         This program is free software; you can redistribute it and/or modify
   7         it under the terms of the GNU General Public License as published by
   8         the Free Software Foundation; either version 2 of the License, or
   9         (at your option) any later version.
  10
  11         This program is distributed in the hope that it will be useful,
  12         but WITHOUT ANY WARRANTY; without even the implied warranty of
  13         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14         GNU General Public License for more details.
  15
  16         You should have received a copy of the GNU General Public License
  17         along with this program; if not, write to the
  18         Free Software Foundation, Inc.,
  19         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  */
  21
  22 /*
  23         Module: rt2x00lib
  24         Abstract: rt2x00 generic device routines.
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/slab.h>
  30
  31 #include "rt2x00.h"
  32 #include "rt2x00lib.h"
  33
  34 /*
  35  * Radio control handlers.
  36  */
  37 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  38 {
  39         int status;
  40
  41         /*
  42          * Don't enable the radio twice.
  43          * And check if the hardware button has been disabled.
  44          */
  45         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  46                 return 0;
  47
  48         /*
  49          * Initialize all data queues.
  50          */
  51         rt2x00queue_init_queues(rt2x00dev);
  52
  53         /*
  54          * Enable radio.
  55          */
  56         status =
  57             rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
  58         if (status)
  59                 return status;
  60
  61         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
  62
  63         rt2x00leds_led_radio(rt2x00dev, true);
  64         rt2x00led_led_activity(rt2x00dev, true);
  65
  66         set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
  67
  68         /*
  69          * Enable RX.
  70          */
  71         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
  72
  73         /*
  74          * Start watchdog monitoring.
  75          */
  76         rt2x00link_start_watchdog(rt2x00dev);
  77
  78         /*
  79          * Start the TX queues.
  80          */
  81         ieee80211_wake_queues(rt2x00dev->hw);
  82
  83         return 0;
  84 }
  85
  86 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
  87 {
  88         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  89                 return;
  90
  91         /*
  92          * Stop the TX queues in mac80211.
  93          */
  94         ieee80211_stop_queues(rt2x00dev->hw);
  95         rt2x00queue_stop_queues(rt2x00dev);
  96
  97         /*
  98          * Stop watchdog monitoring.
  99          */
 100         rt2x00link_stop_watchdog(rt2x00dev);
 101
 102         /*
 103          * Disable RX.
 104          */
 105         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 106
 107         /*
 108          * Disable radio.
 109          */
 110         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 111         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 112         rt2x00led_led_activity(rt2x00dev, false);
 113         rt2x00leds_led_radio(rt2x00dev, false);
 114 }
 115
 116 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 117 {
 118         /*
 119          * When we are disabling the RX, we should also stop the link tuner.
 120          */
 121         if (state == STATE_RADIO_RX_OFF)
 122                 rt2x00link_stop_tuner(rt2x00dev);
 123
 124         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 125
 126         /*
 127          * When we are enabling the RX, we should also start the link tuner.
 128          */
 129         if (state == STATE_RADIO_RX_ON)
 130                 rt2x00link_start_tuner(rt2x00dev);
 131 }
 132
 133 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 134                                           struct ieee80211_vif *vif)
 135 {
 136         struct rt2x00_dev *rt2x00dev = data;
 137         struct rt2x00_intf *intf = vif_to_intf(vif);
 138         int delayed_flags;
 139
 140         /*
 141          * Copy all data we need during this action under the protection
 142          * of a spinlock. Otherwise race conditions might occur which results
 143          * into an invalid configuration.
 144          */
 145         spin_lock(&intf->lock);
 146
 147         delayed_flags = intf->delayed_flags;
 148         intf->delayed_flags = 0;
 149
 150         spin_unlock(&intf->lock);
 151
 152         /*
 153          * It is possible the radio was disabled while the work had been
 154          * scheduled. If that happens we should return here immediately,
 155          * note that in the spinlock protected area above the delayed_flags
 156          * have been cleared correctly.
 157          */
 158         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 159                 return;
 160
 161         if (delayed_flags & DELAYED_UPDATE_BEACON)
 162                 rt2x00queue_update_beacon(rt2x00dev, vif, true);
 163 }
 164
 165 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 166 {
 167         struct rt2x00_dev *rt2x00dev =
 168             container_of(work, struct rt2x00_dev, intf_work);
 169
 170         /*
 171          * Iterate over each interface and perform the
 172          * requested configurations.
 173          */
 174         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 175                                             rt2x00lib_intf_scheduled_iter,
 176                                             rt2x00dev);
 177 }
 178
 179 /*
 180  * Interrupt context handlers.
 181  */
 182 static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac,
 183                                      struct ieee80211_vif *vif)
 184 {
 185         struct rt2x00_dev *rt2x00dev = data;
 186         struct sk_buff *skb;
 187
 188         /*
 189          * Only AP mode interfaces do broad- and multicast buffering
 190          */
 191         if (vif->type != NL80211_IFTYPE_AP)
 192                 return;
 193
 194         /*
 195          * Send out buffered broad- and multicast frames
 196          */
 197         skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 198         while (skb) {
 199                 rt2x00mac_tx(rt2x00dev->hw, skb);
 200                 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 201         }
 202 }
 203
 204 static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac,
 205                                         struct ieee80211_vif *vif)
 206 {
 207         struct rt2x00_dev *rt2x00dev = data;
 208
 209         if (vif->type != NL80211_IFTYPE_AP &&
 210             vif->type != NL80211_IFTYPE_ADHOC &&
 211             vif->type != NL80211_IFTYPE_MESH_POINT &&
 212             vif->type != NL80211_IFTYPE_WDS)
 213                 return;
 214
 215         rt2x00queue_update_beacon(rt2x00dev, vif, true);
 216 }
 217
 218 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 219 {
 220         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 221                 return;
 222
 223         /* send buffered bc/mc frames out for every bssid */
 224         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 225                                             rt2x00lib_bc_buffer_iter,
 226                                             rt2x00dev);
 227         /*
 228          * Devices with pre tbtt interrupt don't need to update the beacon
 229          * here as they will fetch the next beacon directly prior to
 230          * transmission.
 231          */
 232         if (test_bit(DRIVER_SUPPORT_PRE_TBTT_INTERRUPT, &rt2x00dev->flags))
 233                 return;
 234
 235         /* fetch next beacon */
 236         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 237                                             rt2x00lib_beaconupdate_iter,
 238                                             rt2x00dev);
 239 }
 240 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 241
 242 void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev)
 243 {
 244         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 245                 return;
 246
 247         /* fetch next beacon */
 248         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 249                                             rt2x00lib_beaconupdate_iter,
 250                                             rt2x00dev);
 251 }
 252 EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
 253
 254 void rt2x00lib_dmadone(struct queue_entry *entry)
 255 {
 256         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 257         rt2x00queue_index_inc(entry->queue, Q_INDEX_DMA_DONE);
 258 }
 259 EXPORT_SYMBOL_GPL(rt2x00lib_dmadone);
 260
 261 void rt2x00lib_txdone(struct queue_entry *entry,
 262                       struct txdone_entry_desc *txdesc)
 263 {
 264         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 265         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 266         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 267         enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
 268         unsigned int header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 269         u8 rate_idx, rate_flags, retry_rates;
 270         u8 skbdesc_flags = skbdesc->flags;
 271         unsigned int i;
 272         bool success;
 273
 274         /*
 275          * Unmap the skb.
 276          */
 277         rt2x00queue_unmap_skb(entry);
 278
 279         /*
 280          * Remove the extra tx headroom from the skb.
 281          */
 282         skb_pull(entry->skb, rt2x00dev->ops->extra_tx_headroom);
 283
 284         /*
 285          * Signal that the TX descriptor is no longer in the skb.
 286          */
 287         skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
 288
 289         /*
 290          * Remove L2 padding which was added during
 291          */
 292         if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
 293                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 294
 295         /*
 296          * If the IV/EIV data was stripped from the frame before it was
 297          * passed to the hardware, we should now reinsert it again because
 298          * mac80211 will expect the same data to be present it the
 299          * frame as it was passed to us.
 300          */
 301         if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
 302                 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
 303
 304         /*
 305          * Send frame to debugfs immediately, after this call is completed
 306          * we are going to overwrite the skb->cb array.
 307          */
 308         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 309
 310         /*
 311          * Determine if the frame has been successfully transmitted.
 312          */
 313         success =
 314             test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 315             test_bit(TXDONE_UNKNOWN, &txdesc->flags);
 316
 317         /*
 318          * Update TX statistics.
 319          */
 320         rt2x00dev->link.qual.tx_success += success;
 321         rt2x00dev->link.qual.tx_failed += !success;
 322
 323         rate_idx = skbdesc->tx_rate_idx;
 324         rate_flags = skbdesc->tx_rate_flags;
 325         retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
 326             (txdesc->retry + 1) : 1;
 327
 328         /*
 329          * Initialize TX status
 330          */
 331         memset(&tx_info->status, 0, sizeof(tx_info->status));
 332         tx_info->status.ack_signal = 0;
 333
 334         /*
 335          * Frame was send with retries, hardware tried
 336          * different rates to send out the frame, at each
 337          * retry it lowered the rate 1 step except when the
 338          * lowest rate was used.
 339          */
 340         for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
 341                 tx_info->status.rates[i].idx = rate_idx - i;
 342                 tx_info->status.rates[i].flags = rate_flags;
 343
 344                 if (rate_idx - i == 0) {
 345                         /*
 346                          * The lowest rate (index 0) was used until the
 347                          * number of max retries was reached.
 348                          */
 349                         tx_info->status.rates[i].count = retry_rates - i;
 350                         i++;
 351                         break;
 352                 }
 353                 tx_info->status.rates[i].count = 1;
 354         }
 355         if (i < (IEEE80211_TX_MAX_RATES - 1))
 356                 tx_info->status.rates[i].idx = -1; /* terminate */
 357
 358         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 359                 if (success)
 360                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 361                 else
 362                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 363         }
 364
 365         /*
 366          * Every single frame has it's own tx status, hence report
 367          * every frame as ampdu of size 1.
 368          *
 369          * TODO: if we can find out how many frames were aggregated
 370          * by the hw we could provide the real ampdu_len to mac80211
 371          * which would allow the rc algorithm to better decide on
 372          * which rates are suitable.
 373          */
 374         if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 375                 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
 376                 tx_info->status.ampdu_len = 1;
 377                 tx_info->status.ampdu_ack_len = success ? 1 : 0;
 378         }
 379
 380         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 381                 if (success)
 382                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 383                 else
 384                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 385         }
 386
 387         /*
 388          * Only send the status report to mac80211 when it's a frame
 389          * that originated in mac80211. If this was a extra frame coming
 390          * through a mac80211 library call (RTS/CTS) then we should not
 391          * send the status report back.
 392          */
 393         if (!(skbdesc_flags & SKBDESC_NOT_MAC80211)) {
 394                 if (test_bit(DRIVER_REQUIRE_TASKLET_CONTEXT, &rt2x00dev->flags))
 395                         ieee80211_tx_status(rt2x00dev->hw, entry->skb);
 396                 else
 397                         ieee80211_tx_status_ni(rt2x00dev->hw, entry->skb);
 398         } else
 399                 dev_kfree_skb_any(entry->skb);
 400
 401         /*
 402          * Make this entry available for reuse.
 403          */
 404         entry->skb = NULL;
 405         entry->flags = 0;
 406
 407         rt2x00dev->ops->lib->clear_entry(entry);
 408
 409         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 410
 411         /*
 412          * If the data queue was below the threshold before the txdone
 413          * handler we must make sure the packet queue in the mac80211 stack
 414          * is reenabled when the txdone handler has finished.
 415          */
 416         if (!rt2x00queue_threshold(entry->queue))
 417                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 418 }
 419 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 420
 421 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
 422 {
 423         struct txdone_entry_desc txdesc;
 424
 425         txdesc.flags = 0;
 426         __set_bit(status, &txdesc.flags);
 427         txdesc.retry = 0;
 428
 429         rt2x00lib_txdone(entry, &txdesc);
 430 }
 431 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
 432
 433 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 434                                         struct rxdone_entry_desc *rxdesc)
 435 {
 436         struct ieee80211_supported_band *sband;
 437         const struct rt2x00_rate *rate;
 438         unsigned int i;
 439         int signal = rxdesc->signal;
 440         int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 441
 442         switch (rxdesc->rate_mode) {
 443         case RATE_MODE_CCK:
 444         case RATE_MODE_OFDM:
 445                 /*
 446                  * For non-HT rates the MCS value needs to contain the
 447                  * actually used rate modulation (CCK or OFDM).
 448                  */
 449                 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 450                         signal = RATE_MCS(rxdesc->rate_mode, signal);
 451
 452                 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 453                 for (i = 0; i < sband->n_bitrates; i++) {
 454                         rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 455                         if (((type == RXDONE_SIGNAL_PLCP) &&
 456                              (rate->plcp == signal)) ||
 457                             ((type == RXDONE_SIGNAL_BITRATE) &&
 458                               (rate->bitrate == signal)) ||
 459                             ((type == RXDONE_SIGNAL_MCS) &&
 460                               (rate->mcs == signal))) {
 461                                 return i;
 462                         }
 463                 }
 464                 break;
 465         case RATE_MODE_HT_MIX:
 466         case RATE_MODE_HT_GREENFIELD:
 467                 if (signal >= 0 && signal <= 76)
 468                         return signal;
 469                 break;
 470         default:
 471                 break;
 472         }
 473
 474         WARNING(rt2x00dev, "Frame received with unrecognized signal, "
 475                 "mode=0x%.4x, signal=0x%.4x, type=%d.\n",
 476                 rxdesc->rate_mode, signal, type);
 477         return 0;
 478 }
 479
 480 void rt2x00lib_rxdone(struct queue_entry *entry)
 481 {
 482         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 483         struct rxdone_entry_desc rxdesc;
 484         struct sk_buff *skb;
 485         struct ieee80211_rx_status *rx_status;
 486         unsigned int header_length;
 487         int rate_idx;
 488
 489         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 490                 goto submit_entry;
 491
 492         /*
 493          * Allocate a new sk_buffer. If no new buffer available, drop the
 494          * received frame and reuse the existing buffer.
 495          */
 496         skb = rt2x00queue_alloc_rxskb(entry);
 497         if (!skb)
 498                 goto submit_entry;
 499
 500         /*
 501          * Unmap the skb.
 502          */
 503         rt2x00queue_unmap_skb(entry);
 504
 505         /*
 506          * Extract the RXD details.
 507          */
 508         memset(&rxdesc, 0, sizeof(rxdesc));
 509         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 510
 511         /*
 512          * The data behind the ieee80211 header must be
 513          * aligned on a 4 byte boundary.
 514          */
 515         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 516
 517         /*
 518          * Hardware might have stripped the IV/EIV/ICV data,
 519          * in that case it is possible that the data was
 520          * provided separately (through hardware descriptor)
 521          * in which case we should reinsert the data into the frame.
 522          */
 523         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 524             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 525                 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
 526                                           &rxdesc);
 527         else if (header_length &&
 528                  (rxdesc.size > header_length) &&
 529                  (rxdesc.dev_flags & RXDONE_L2PAD))
 530                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 531         else
 532                 rt2x00queue_align_payload(entry->skb, header_length);
 533
 534         /* Trim buffer to correct size */
 535         skb_trim(entry->skb, rxdesc.size);
 536
 537         /*
 538          * Translate the signal to the correct bitrate index.
 539          */
 540         rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 541         if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
 542             rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
 543                 rxdesc.flags |= RX_FLAG_HT;
 544
 545         /*
 546          * Update extra components
 547          */
 548         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 549         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 550         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 551
 552         /*
 553          * Initialize RX status information, and send frame
 554          * to mac80211.
 555          */
 556         rx_status = IEEE80211_SKB_RXCB(entry->skb);
 557         rx_status->mactime = rxdesc.timestamp;
 558         rx_status->band = rt2x00dev->curr_band;
 559         rx_status->freq = rt2x00dev->curr_freq;
 560         rx_status->rate_idx = rate_idx;
 561         rx_status->signal = rxdesc.rssi;
 562         rx_status->flag = rxdesc.flags;
 563         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 564
 565         ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
 566
 567         /*
 568          * Replace the skb with the freshly allocated one.
 569          */
 570         entry->skb = skb;
 571
 572 submit_entry:
 573         rt2x00dev->ops->lib->clear_entry(entry);
 574         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 575         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 576 }
 577 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 578
 579 /*
 580  * Driver initialization handlers.
 581  */
 582 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 583         {
 584                 .flags = DEV_RATE_CCK,
 585                 .bitrate = 10,
 586                 .ratemask = BIT(0),
 587                 .plcp = 0x00,
 588                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 589         },
 590         {
 591                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 592                 .bitrate = 20,
 593                 .ratemask = BIT(1),
 594                 .plcp = 0x01,
 595                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 596         },
 597         {
 598                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 599                 .bitrate = 55,
 600                 .ratemask = BIT(2),
 601                 .plcp = 0x02,
 602                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 603         },
 604         {
 605                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 606                 .bitrate = 110,
 607                 .ratemask = BIT(3),
 608                 .plcp = 0x03,
 609                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 610         },
 611         {
 612                 .flags = DEV_RATE_OFDM,
 613                 .bitrate = 60,
 614                 .ratemask = BIT(4),
 615                 .plcp = 0x0b,
 616                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 617         },
 618         {
 619                 .flags = DEV_RATE_OFDM,
 620                 .bitrate = 90,
 621                 .ratemask = BIT(5),
 622                 .plcp = 0x0f,
 623                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 624         },
 625         {
 626                 .flags = DEV_RATE_OFDM,
 627                 .bitrate = 120,
 628                 .ratemask = BIT(6),
 629                 .plcp = 0x0a,
 630                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 631         },
 632         {
 633                 .flags = DEV_RATE_OFDM,
 634                 .bitrate = 180,
 635                 .ratemask = BIT(7),
 636                 .plcp = 0x0e,
 637                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 638         },
 639         {
 640                 .flags = DEV_RATE_OFDM,
 641                 .bitrate = 240,
 642                 .ratemask = BIT(8),
 643                 .plcp = 0x09,
 644                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 645         },
 646         {
 647                 .flags = DEV_RATE_OFDM,
 648                 .bitrate = 360,
 649                 .ratemask = BIT(9),
 650                 .plcp = 0x0d,
 651                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 652         },
 653         {
 654                 .flags = DEV_RATE_OFDM,
 655                 .bitrate = 480,
 656                 .ratemask = BIT(10),
 657                 .plcp = 0x08,
 658                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 659         },
 660         {
 661                 .flags = DEV_RATE_OFDM,
 662                 .bitrate = 540,
 663                 .ratemask = BIT(11),
 664                 .plcp = 0x0c,
 665                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 666         },
 667 };
 668
 669 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 670                               const int channel, const int tx_power,
 671                               const int value)
 672 {
 673         entry->center_freq = ieee80211_channel_to_frequency(channel);
 674         entry->hw_value = value;
 675         entry->max_power = tx_power;
 676         entry->max_antenna_gain = 0xff;
 677 }
 678
 679 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 680                            const u16 index, const struct rt2x00_rate *rate)
 681 {
 682         entry->flags = 0;
 683         entry->bitrate = rate->bitrate;
 684         entry->hw_value =index;
 685         entry->hw_value_short = index;
 686
 687         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 688                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 689 }
 690
 691 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 692                                     struct hw_mode_spec *spec)
 693 {
 694         struct ieee80211_hw *hw = rt2x00dev->hw;
 695         struct ieee80211_channel *channels;
 696         struct ieee80211_rate *rates;
 697         unsigned int num_rates;
 698         unsigned int i;
 699
 700         num_rates = 0;
 701         if (spec->supported_rates & SUPPORT_RATE_CCK)
 702                 num_rates += 4;
 703         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 704                 num_rates += 8;
 705
 706         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 707         if (!channels)
 708                 return -ENOMEM;
 709
 710         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 711         if (!rates)
 712                 goto exit_free_channels;
 713
 714         /*
 715          * Initialize Rate list.
 716          */
 717         for (i = 0; i < num_rates; i++)
 718                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 719
 720         /*
 721          * Initialize Channel list.
 722          */
 723         for (i = 0; i < spec->num_channels; i++) {
 724                 rt2x00lib_channel(&channels[i],
 725                                   spec->channels[i].channel,
 726                                   spec->channels_info[i].max_power, i);
 727         }
 728
 729         /*
 730          * Intitialize 802.11b, 802.11g
 731          * Rates: CCK, OFDM.
 732          * Channels: 2.4 GHz
 733          */
 734         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 735                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 736                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 737                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 738                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 739                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 740                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 741                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
 742                        &spec->ht, sizeof(spec->ht));
 743         }
 744
 745         /*
 746          * Intitialize 802.11a
 747          * Rates: OFDM.
 748          * Channels: OFDM, UNII, HiperLAN2.
 749          */
 750         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 751                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 752                     spec->num_channels - 14;
 753                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 754                     num_rates - 4;
 755                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 756                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 757                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 758                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 759                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
 760                        &spec->ht, sizeof(spec->ht));
 761         }
 762
 763         return 0;
 764
 765  exit_free_channels:
 766         kfree(channels);
 767         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 768         return -ENOMEM;
 769 }
 770
 771 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 772 {
 773         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 774                 ieee80211_unregister_hw(rt2x00dev->hw);
 775
 776         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 777                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 778                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 779                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 780                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 781         }
 782
 783         kfree(rt2x00dev->spec.channels_info);
 784 }
 785
 786 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 787 {
 788         struct hw_mode_spec *spec = &rt2x00dev->spec;
 789         int status;
 790
 791         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 792                 return 0;
 793
 794         /*
 795          * Initialize HW modes.
 796          */
 797         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 798         if (status)
 799                 return status;
 800
 801         /*
 802          * Initialize HW fields.
 803          */
 804         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 805
 806         /*
 807          * Initialize extra TX headroom required.
 808          */
 809         rt2x00dev->hw->extra_tx_headroom =
 810                 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
 811                       rt2x00dev->ops->extra_tx_headroom);
 812
 813         /*
 814          * Take TX headroom required for alignment into account.
 815          */
 816         if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
 817                 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
 818         else if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags))
 819                 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
 820
 821         /*
 822          * Allocate tx status FIFO for driver use.
 823          */
 824         if (test_bit(DRIVER_REQUIRE_TXSTATUS_FIFO, &rt2x00dev->flags) &&
 825             rt2x00dev->ops->lib->txstatus_tasklet) {
 826                 /*
 827                  * Allocate txstatus fifo and tasklet, we use a size of 512
 828                  * for the kfifo which is big enough to store 512/4=128 tx
 829                  * status reports. In the worst case (tx status for all tx
 830                  * queues gets reported before we've got a chance to handle
 831                  * them) 24*4=384 tx status reports need to be cached.
 832                  */
 833                 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, 512,
 834                                      GFP_KERNEL);
 835                 if (status)
 836                         return status;
 837
 838                 /* tasklet for processing the tx status reports. */
 839                 tasklet_init(&rt2x00dev->txstatus_tasklet,
 840                              rt2x00dev->ops->lib->txstatus_tasklet,
 841                              (unsigned long)rt2x00dev);
 842
 843         }
 844
 845         /*
 846          * Register HW.
 847          */
 848         status = ieee80211_register_hw(rt2x00dev->hw);
 849         if (status)
 850                 return status;
 851
 852         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 853
 854         return 0;
 855 }
 856
 857 /*
 858  * Initialization/uninitialization handlers.
 859  */
 860 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 861 {
 862         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 863                 return;
 864
 865         /*
 866          * Unregister extra components.
 867          */
 868         rt2x00rfkill_unregister(rt2x00dev);
 869
 870         /*
 871          * Allow the HW to uninitialize.
 872          */
 873         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 874
 875         /*
 876          * Free allocated queue entries.
 877          */
 878         rt2x00queue_uninitialize(rt2x00dev);
 879 }
 880
 881 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 882 {
 883         int status;
 884
 885         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 886                 return 0;
 887
 888         /*
 889          * Allocate all queue entries.
 890          */
 891         status = rt2x00queue_initialize(rt2x00dev);
 892         if (status)
 893                 return status;
 894
 895         /*
 896          * Initialize the device.
 897          */
 898         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 899         if (status) {
 900                 rt2x00queue_uninitialize(rt2x00dev);
 901                 return status;
 902         }
 903
 904         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
 905
 906         /*
 907          * Register the extra components.
 908          */
 909         rt2x00rfkill_register(rt2x00dev);
 910
 911         return 0;
 912 }
 913
 914 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 915 {
 916         int retval;
 917
 918         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 919                 return 0;
 920
 921         /*
 922          * If this is the first interface which is added,
 923          * we should load the firmware now.
 924          */
 925         retval = rt2x00lib_load_firmware(rt2x00dev);
 926         if (retval)
 927                 return retval;
 928
 929         /*
 930          * Initialize the device.
 931          */
 932         retval = rt2x00lib_initialize(rt2x00dev);
 933         if (retval)
 934                 return retval;
 935
 936         rt2x00dev->intf_ap_count = 0;
 937         rt2x00dev->intf_sta_count = 0;
 938         rt2x00dev->intf_associated = 0;
 939
 940         /* Enable the radio */
 941         retval = rt2x00lib_enable_radio(rt2x00dev);
 942         if (retval)
 943                 return retval;
 944
 945         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
 946
 947         return 0;
 948 }
 949
 950 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
 951 {
 952         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 953                 return;
 954
 955         /*
 956          * Perhaps we can add something smarter here,
 957          * but for now just disabling the radio should do.
 958          */
 959         rt2x00lib_disable_radio(rt2x00dev);
 960
 961         rt2x00dev->intf_ap_count = 0;
 962         rt2x00dev->intf_sta_count = 0;
 963         rt2x00dev->intf_associated = 0;
 964 }
 965
 966 /*
 967  * driver allocation handlers.
 968  */
 969 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 970 {
 971         int retval = -ENOMEM;
 972
 973         mutex_init(&rt2x00dev->csr_mutex);
 974
 975         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 976
 977         /*
 978          * Make room for rt2x00_intf inside the per-interface
 979          * structure ieee80211_vif.
 980          */
 981         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
 982
 983         /*
 984          * Determine which operating modes are supported, all modes
 985          * which require beaconing, depend on the availability of
 986          * beacon entries.
 987          */
 988         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
 989         if (rt2x00dev->ops->bcn->entry_num > 0)
 990                 rt2x00dev->hw->wiphy->interface_modes |=
 991                     BIT(NL80211_IFTYPE_ADHOC) |
 992                     BIT(NL80211_IFTYPE_AP) |
 993                     BIT(NL80211_IFTYPE_MESH_POINT) |
 994                     BIT(NL80211_IFTYPE_WDS);
 995
 996         /*
 997          * Initialize configuration work.
 998          */
 999         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1000
1001         /*
1002          * Let the driver probe the device to detect the capabilities.
1003          */
1004         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1005         if (retval) {
1006                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1007                 goto exit;
1008         }
1009
1010         /*
1011          * Allocate queue array.
1012          */
1013         retval = rt2x00queue_allocate(rt2x00dev);
1014         if (retval)
1015                 goto exit;
1016
1017         /*
1018          * Initialize ieee80211 structure.
1019          */
1020         retval = rt2x00lib_probe_hw(rt2x00dev);
1021         if (retval) {
1022                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1023                 goto exit;
1024         }
1025
1026         /*
1027          * Register extra components.
1028          */
1029         rt2x00link_register(rt2x00dev);
1030         rt2x00leds_register(rt2x00dev);
1031         rt2x00debug_register(rt2x00dev);
1032
1033         return 0;
1034
1035 exit:
1036         rt2x00lib_remove_dev(rt2x00dev);
1037
1038         return retval;
1039 }
1040 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1041
1042 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1043 {
1044         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1045
1046         /*
1047          * Disable radio.
1048          */
1049         rt2x00lib_disable_radio(rt2x00dev);
1050
1051         /*
1052          * Stop all work.
1053          */
1054         cancel_work_sync(&rt2x00dev->intf_work);
1055         cancel_work_sync(&rt2x00dev->rxdone_work);
1056         cancel_work_sync(&rt2x00dev->txdone_work);
1057
1058         /*
1059          * Free the tx status fifo.
1060          */
1061         kfifo_free(&rt2x00dev->txstatus_fifo);
1062
1063         /*
1064          * Kill the tx status tasklet.
1065          */
1066         tasklet_kill(&rt2x00dev->txstatus_tasklet);
1067
1068         /*
1069          * Uninitialize device.
1070          */
1071         rt2x00lib_uninitialize(rt2x00dev);
1072
1073         /*
1074          * Free extra components
1075          */
1076         rt2x00debug_deregister(rt2x00dev);
1077         rt2x00leds_unregister(rt2x00dev);
1078
1079         /*
1080          * Free ieee80211_hw memory.
1081          */
1082         rt2x00lib_remove_hw(rt2x00dev);
1083
1084         /*
1085          * Free firmware image.
1086          */
1087         rt2x00lib_free_firmware(rt2x00dev);
1088
1089         /*
1090          * Free queue structures.
1091          */
1092         rt2x00queue_free(rt2x00dev);
1093 }
1094 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1095
1096 /*
1097  * Device state handlers
1098  */
1099 #ifdef CONFIG_PM
1100 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1101 {
1102         NOTICE(rt2x00dev, "Going to sleep.\n");
1103
1104         /*
1105          * Prevent mac80211 from accessing driver while suspended.
1106          */
1107         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1108                 return 0;
1109
1110         /*
1111          * Cleanup as much as possible.
1112          */
1113         rt2x00lib_uninitialize(rt2x00dev);
1114
1115         /*
1116          * Suspend/disable extra components.
1117          */
1118         rt2x00leds_suspend(rt2x00dev);
1119         rt2x00debug_deregister(rt2x00dev);
1120
1121         /*
1122          * Set device mode to sleep for power management,
1123          * on some hardware this call seems to consistently fail.
1124          * From the specifications it is hard to tell why it fails,
1125          * and if this is a "bad thing".
1126          * Overall it is safe to just ignore the failure and
1127          * continue suspending. The only downside is that the
1128          * device will not be in optimal power save mode, but with
1129          * the radio and the other components already disabled the
1130          * device is as good as disabled.
1131          */
1132         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1133                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1134                         "continue suspending.\n");
1135
1136         return 0;
1137 }
1138 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1139
1140 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1141 {
1142         NOTICE(rt2x00dev, "Waking up.\n");
1143
1144         /*
1145          * Restore/enable extra components.
1146          */
1147         rt2x00debug_register(rt2x00dev);
1148         rt2x00leds_resume(rt2x00dev);
1149
1150         /*
1151          * We are ready again to receive requests from mac80211.
1152          */
1153         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1154
1155         return 0;
1156 }
1157 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1158 #endif /* CONFIG_PM */
1159
1160 /*
1161  * rt2x00lib module information.
1162  */
1163 MODULE_AUTHOR(DRV_PROJECT);
1164 MODULE_VERSION(DRV_VERSION);
1165 MODULE_DESCRIPTION("rt2x00 library");
1166 MODULE_LICENSE("GPL");