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                 ieee80211_tx_status(rt2x00dev->hw, entry->skb);
 395         else
 396                 dev_kfree_skb_any(entry->skb);
 397
 398         /*
 399          * Make this entry available for reuse.
 400          */
 401         entry->skb = NULL;
 402         entry->flags = 0;
 403
 404         rt2x00dev->ops->lib->clear_entry(entry);
 405
 406         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 407
 408         /*
 409          * If the data queue was below the threshold before the txdone
 410          * handler we must make sure the packet queue in the mac80211 stack
 411          * is reenabled when the txdone handler has finished.
 412          */
 413         if (!rt2x00queue_threshold(entry->queue))
 414                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 415 }
 416 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 417
 418 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
 419 {
 420         struct txdone_entry_desc txdesc;
 421
 422         txdesc.flags = 0;
 423         __set_bit(status, &txdesc.flags);
 424         txdesc.retry = 0;
 425
 426         rt2x00lib_txdone(entry, &txdesc);
 427 }
 428 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
 429
 430 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 431                                         struct rxdone_entry_desc *rxdesc)
 432 {
 433         struct ieee80211_supported_band *sband;
 434         const struct rt2x00_rate *rate;
 435         unsigned int i;
 436         int signal = rxdesc->signal;
 437         int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 438
 439         switch (rxdesc->rate_mode) {
 440         case RATE_MODE_CCK:
 441         case RATE_MODE_OFDM:
 442                 /*
 443                  * For non-HT rates the MCS value needs to contain the
 444                  * actually used rate modulation (CCK or OFDM).
 445                  */
 446                 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 447                         signal = RATE_MCS(rxdesc->rate_mode, signal);
 448
 449                 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 450                 for (i = 0; i < sband->n_bitrates; i++) {
 451                         rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 452                         if (((type == RXDONE_SIGNAL_PLCP) &&
 453                              (rate->plcp == signal)) ||
 454                             ((type == RXDONE_SIGNAL_BITRATE) &&
 455                               (rate->bitrate == signal)) ||
 456                             ((type == RXDONE_SIGNAL_MCS) &&
 457                               (rate->mcs == signal))) {
 458                                 return i;
 459                         }
 460                 }
 461                 break;
 462         case RATE_MODE_HT_MIX:
 463         case RATE_MODE_HT_GREENFIELD:
 464                 if (signal >= 0 && signal <= 76)
 465                         return signal;
 466                 break;
 467         default:
 468                 break;
 469         }
 470
 471         WARNING(rt2x00dev, "Frame received with unrecognized signal, "
 472                 "mode=0x%.4x, signal=0x%.4x, type=%d.\n",
 473                 rxdesc->rate_mode, signal, type);
 474         return 0;
 475 }
 476
 477 void rt2x00lib_rxdone(struct queue_entry *entry)
 478 {
 479         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 480         struct rxdone_entry_desc rxdesc;
 481         struct sk_buff *skb;
 482         struct ieee80211_rx_status *rx_status;
 483         unsigned int header_length;
 484         int rate_idx;
 485
 486         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 487             !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 488                 goto submit_entry;
 489
 490         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 491                 goto submit_entry;
 492
 493         /*
 494          * Allocate a new sk_buffer. If no new buffer available, drop the
 495          * received frame and reuse the existing buffer.
 496          */
 497         skb = rt2x00queue_alloc_rxskb(entry);
 498         if (!skb)
 499                 goto submit_entry;
 500
 501         /*
 502          * Unmap the skb.
 503          */
 504         rt2x00queue_unmap_skb(entry);
 505
 506         /*
 507          * Extract the RXD details.
 508          */
 509         memset(&rxdesc, 0, sizeof(rxdesc));
 510         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 511
 512         /*
 513          * The data behind the ieee80211 header must be
 514          * aligned on a 4 byte boundary.
 515          */
 516         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 517
 518         /*
 519          * Hardware might have stripped the IV/EIV/ICV data,
 520          * in that case it is possible that the data was
 521          * provided separately (through hardware descriptor)
 522          * in which case we should reinsert the data into the frame.
 523          */
 524         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 525             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 526                 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
 527                                           &rxdesc);
 528         else if (header_length &&
 529                  (rxdesc.size > header_length) &&
 530                  (rxdesc.dev_flags & RXDONE_L2PAD))
 531                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 532         else
 533                 rt2x00queue_align_payload(entry->skb, header_length);
 534
 535         /* Trim buffer to correct size */
 536         skb_trim(entry->skb, rxdesc.size);
 537
 538         /*
 539          * Translate the signal to the correct bitrate index.
 540          */
 541         rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 542         if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
 543             rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
 544                 rxdesc.flags |= RX_FLAG_HT;
 545
 546         /*
 547          * Update extra components
 548          */
 549         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 550         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 551         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 552
 553         /*
 554          * Initialize RX status information, and send frame
 555          * to mac80211.
 556          */
 557         rx_status = IEEE80211_SKB_RXCB(entry->skb);
 558         rx_status->mactime = rxdesc.timestamp;
 559         rx_status->band = rt2x00dev->curr_band;
 560         rx_status->freq = rt2x00dev->curr_freq;
 561         rx_status->rate_idx = rate_idx;
 562         rx_status->signal = rxdesc.rssi;
 563         rx_status->flag = rxdesc.flags;
 564         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 565
 566         ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
 567
 568         /*
 569          * Replace the skb with the freshly allocated one.
 570          */
 571         entry->skb = skb;
 572
 573 submit_entry:
 574         entry->flags = 0;
 575         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 576         if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
 577             test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) {
 578                 rt2x00dev->ops->lib->clear_entry(entry);
 579                 rt2x00queue_index_inc(entry->queue, Q_INDEX);
 580         }
 581 }
 582 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 583
 584 /*
 585  * Driver initialization handlers.
 586  */
 587 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 588         {
 589                 .flags = DEV_RATE_CCK,
 590                 .bitrate = 10,
 591                 .ratemask = BIT(0),
 592                 .plcp = 0x00,
 593                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 594         },
 595         {
 596                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 597                 .bitrate = 20,
 598                 .ratemask = BIT(1),
 599                 .plcp = 0x01,
 600                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 601         },
 602         {
 603                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 604                 .bitrate = 55,
 605                 .ratemask = BIT(2),
 606                 .plcp = 0x02,
 607                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 608         },
 609         {
 610                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 611                 .bitrate = 110,
 612                 .ratemask = BIT(3),
 613                 .plcp = 0x03,
 614                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 615         },
 616         {
 617                 .flags = DEV_RATE_OFDM,
 618                 .bitrate = 60,
 619                 .ratemask = BIT(4),
 620                 .plcp = 0x0b,
 621                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 622         },
 623         {
 624                 .flags = DEV_RATE_OFDM,
 625                 .bitrate = 90,
 626                 .ratemask = BIT(5),
 627                 .plcp = 0x0f,
 628                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 629         },
 630         {
 631                 .flags = DEV_RATE_OFDM,
 632                 .bitrate = 120,
 633                 .ratemask = BIT(6),
 634                 .plcp = 0x0a,
 635                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 636         },
 637         {
 638                 .flags = DEV_RATE_OFDM,
 639                 .bitrate = 180,
 640                 .ratemask = BIT(7),
 641                 .plcp = 0x0e,
 642                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 643         },
 644         {
 645                 .flags = DEV_RATE_OFDM,
 646                 .bitrate = 240,
 647                 .ratemask = BIT(8),
 648                 .plcp = 0x09,
 649                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 650         },
 651         {
 652                 .flags = DEV_RATE_OFDM,
 653                 .bitrate = 360,
 654                 .ratemask = BIT(9),
 655                 .plcp = 0x0d,
 656                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 657         },
 658         {
 659                 .flags = DEV_RATE_OFDM,
 660                 .bitrate = 480,
 661                 .ratemask = BIT(10),
 662                 .plcp = 0x08,
 663                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 664         },
 665         {
 666                 .flags = DEV_RATE_OFDM,
 667                 .bitrate = 540,
 668                 .ratemask = BIT(11),
 669                 .plcp = 0x0c,
 670                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 671         },
 672 };
 673
 674 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 675                               const int channel, const int tx_power,
 676                               const int value)
 677 {
 678         entry->center_freq = ieee80211_channel_to_frequency(channel);
 679         entry->hw_value = value;
 680         entry->max_power = tx_power;
 681         entry->max_antenna_gain = 0xff;
 682 }
 683
 684 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 685                            const u16 index, const struct rt2x00_rate *rate)
 686 {
 687         entry->flags = 0;
 688         entry->bitrate = rate->bitrate;
 689         entry->hw_value =index;
 690         entry->hw_value_short = index;
 691
 692         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 693                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 694 }
 695
 696 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 697                                     struct hw_mode_spec *spec)
 698 {
 699         struct ieee80211_hw *hw = rt2x00dev->hw;
 700         struct ieee80211_channel *channels;
 701         struct ieee80211_rate *rates;
 702         unsigned int num_rates;
 703         unsigned int i;
 704
 705         num_rates = 0;
 706         if (spec->supported_rates & SUPPORT_RATE_CCK)
 707                 num_rates += 4;
 708         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 709                 num_rates += 8;
 710
 711         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 712         if (!channels)
 713                 return -ENOMEM;
 714
 715         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 716         if (!rates)
 717                 goto exit_free_channels;
 718
 719         /*
 720          * Initialize Rate list.
 721          */
 722         for (i = 0; i < num_rates; i++)
 723                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 724
 725         /*
 726          * Initialize Channel list.
 727          */
 728         for (i = 0; i < spec->num_channels; i++) {
 729                 rt2x00lib_channel(&channels[i],
 730                                   spec->channels[i].channel,
 731                                   spec->channels_info[i].max_power, i);
 732         }
 733
 734         /*
 735          * Intitialize 802.11b, 802.11g
 736          * Rates: CCK, OFDM.
 737          * Channels: 2.4 GHz
 738          */
 739         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 740                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 741                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 742                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 743                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 744                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 745                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 746                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
 747                        &spec->ht, sizeof(spec->ht));
 748         }
 749
 750         /*
 751          * Intitialize 802.11a
 752          * Rates: OFDM.
 753          * Channels: OFDM, UNII, HiperLAN2.
 754          */
 755         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 756                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 757                     spec->num_channels - 14;
 758                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 759                     num_rates - 4;
 760                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 761                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 762                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 763                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 764                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
 765                        &spec->ht, sizeof(spec->ht));
 766         }
 767
 768         return 0;
 769
 770  exit_free_channels:
 771         kfree(channels);
 772         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 773         return -ENOMEM;
 774 }
 775
 776 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 777 {
 778         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 779                 ieee80211_unregister_hw(rt2x00dev->hw);
 780
 781         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 782                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 783                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 784                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 785                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 786         }
 787
 788         kfree(rt2x00dev->spec.channels_info);
 789 }
 790
 791 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 792 {
 793         struct hw_mode_spec *spec = &rt2x00dev->spec;
 794         int status;
 795
 796         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 797                 return 0;
 798
 799         /*
 800          * Initialize HW modes.
 801          */
 802         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 803         if (status)
 804                 return status;
 805
 806         /*
 807          * Initialize HW fields.
 808          */
 809         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 810
 811         /*
 812          * Initialize extra TX headroom required.
 813          */
 814         rt2x00dev->hw->extra_tx_headroom =
 815                 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
 816                       rt2x00dev->ops->extra_tx_headroom);
 817
 818         /*
 819          * Take TX headroom required for alignment into account.
 820          */
 821         if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
 822                 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
 823         else if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags))
 824                 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
 825
 826         /*
 827          * Allocate tx status FIFO for driver use.
 828          */
 829         if (test_bit(DRIVER_REQUIRE_TXSTATUS_FIFO, &rt2x00dev->flags) &&
 830             rt2x00dev->ops->lib->txstatus_tasklet) {
 831                 /*
 832                  * Allocate txstatus fifo and tasklet, we use a size of 512
 833                  * for the kfifo which is big enough to store 512/4=128 tx
 834                  * status reports. In the worst case (tx status for all tx
 835                  * queues gets reported before we've got a chance to handle
 836                  * them) 24*4=384 tx status reports need to be cached.
 837                  */
 838                 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, 512,
 839                                      GFP_KERNEL);
 840                 if (status)
 841                         return status;
 842
 843                 /* tasklet for processing the tx status reports. */
 844                 tasklet_init(&rt2x00dev->txstatus_tasklet,
 845                              rt2x00dev->ops->lib->txstatus_tasklet,
 846                              (unsigned long)rt2x00dev);
 847
 848         }
 849
 850         /*
 851          * Register HW.
 852          */
 853         status = ieee80211_register_hw(rt2x00dev->hw);
 854         if (status)
 855                 return status;
 856
 857         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 858
 859         return 0;
 860 }
 861
 862 /*
 863  * Initialization/uninitialization handlers.
 864  */
 865 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 866 {
 867         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 868                 return;
 869
 870         /*
 871          * Unregister extra components.
 872          */
 873         rt2x00rfkill_unregister(rt2x00dev);
 874
 875         /*
 876          * Allow the HW to uninitialize.
 877          */
 878         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 879
 880         /*
 881          * Free allocated queue entries.
 882          */
 883         rt2x00queue_uninitialize(rt2x00dev);
 884 }
 885
 886 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 887 {
 888         int status;
 889
 890         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 891                 return 0;
 892
 893         /*
 894          * Allocate all queue entries.
 895          */
 896         status = rt2x00queue_initialize(rt2x00dev);
 897         if (status)
 898                 return status;
 899
 900         /*
 901          * Initialize the device.
 902          */
 903         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 904         if (status) {
 905                 rt2x00queue_uninitialize(rt2x00dev);
 906                 return status;
 907         }
 908
 909         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
 910
 911         /*
 912          * Register the extra components.
 913          */
 914         rt2x00rfkill_register(rt2x00dev);
 915
 916         return 0;
 917 }
 918
 919 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 920 {
 921         int retval;
 922
 923         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 924                 return 0;
 925
 926         /*
 927          * If this is the first interface which is added,
 928          * we should load the firmware now.
 929          */
 930         retval = rt2x00lib_load_firmware(rt2x00dev);
 931         if (retval)
 932                 return retval;
 933
 934         /*
 935          * Initialize the device.
 936          */
 937         retval = rt2x00lib_initialize(rt2x00dev);
 938         if (retval)
 939                 return retval;
 940
 941         rt2x00dev->intf_ap_count = 0;
 942         rt2x00dev->intf_sta_count = 0;
 943         rt2x00dev->intf_associated = 0;
 944
 945         /* Enable the radio */
 946         retval = rt2x00lib_enable_radio(rt2x00dev);
 947         if (retval)
 948                 return retval;
 949
 950         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
 951
 952         return 0;
 953 }
 954
 955 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
 956 {
 957         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 958                 return;
 959
 960         /*
 961          * Perhaps we can add something smarter here,
 962          * but for now just disabling the radio should do.
 963          */
 964         rt2x00lib_disable_radio(rt2x00dev);
 965
 966         rt2x00dev->intf_ap_count = 0;
 967         rt2x00dev->intf_sta_count = 0;
 968         rt2x00dev->intf_associated = 0;
 969 }
 970
 971 /*
 972  * driver allocation handlers.
 973  */
 974 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 975 {
 976         int retval = -ENOMEM;
 977
 978         mutex_init(&rt2x00dev->csr_mutex);
 979
 980         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 981
 982         /*
 983          * Make room for rt2x00_intf inside the per-interface
 984          * structure ieee80211_vif.
 985          */
 986         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
 987
 988         /*
 989          * Determine which operating modes are supported, all modes
 990          * which require beaconing, depend on the availability of
 991          * beacon entries.
 992          */
 993         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
 994         if (rt2x00dev->ops->bcn->entry_num > 0)
 995                 rt2x00dev->hw->wiphy->interface_modes |=
 996                     BIT(NL80211_IFTYPE_ADHOC) |
 997                     BIT(NL80211_IFTYPE_AP) |
 998                     BIT(NL80211_IFTYPE_MESH_POINT) |
 999                     BIT(NL80211_IFTYPE_WDS);
1000
1001         /*
1002          * Initialize configuration work.
1003          */
1004         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1005
1006         /*
1007          * Let the driver probe the device to detect the capabilities.
1008          */
1009         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1010         if (retval) {
1011                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1012                 goto exit;
1013         }
1014
1015         /*
1016          * Allocate queue array.
1017          */
1018         retval = rt2x00queue_allocate(rt2x00dev);
1019         if (retval)
1020                 goto exit;
1021
1022         /*
1023          * Initialize ieee80211 structure.
1024          */
1025         retval = rt2x00lib_probe_hw(rt2x00dev);
1026         if (retval) {
1027                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1028                 goto exit;
1029         }
1030
1031         /*
1032          * Register extra components.
1033          */
1034         rt2x00link_register(rt2x00dev);
1035         rt2x00leds_register(rt2x00dev);
1036         rt2x00debug_register(rt2x00dev);
1037
1038         return 0;
1039
1040 exit:
1041         rt2x00lib_remove_dev(rt2x00dev);
1042
1043         return retval;
1044 }
1045 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1046
1047 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1048 {
1049         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1050
1051         /*
1052          * Disable radio.
1053          */
1054         rt2x00lib_disable_radio(rt2x00dev);
1055
1056         /*
1057          * Stop all work.
1058          */
1059         cancel_work_sync(&rt2x00dev->intf_work);
1060         cancel_work_sync(&rt2x00dev->rxdone_work);
1061         cancel_work_sync(&rt2x00dev->txdone_work);
1062
1063         /*
1064          * Free the tx status fifo.
1065          */
1066         kfifo_free(&rt2x00dev->txstatus_fifo);
1067
1068         /*
1069          * Kill the tx status tasklet.
1070          */
1071         tasklet_kill(&rt2x00dev->txstatus_tasklet);
1072
1073         /*
1074          * Uninitialize device.
1075          */
1076         rt2x00lib_uninitialize(rt2x00dev);
1077
1078         /*
1079          * Free extra components
1080          */
1081         rt2x00debug_deregister(rt2x00dev);
1082         rt2x00leds_unregister(rt2x00dev);
1083
1084         /*
1085          * Free ieee80211_hw memory.
1086          */
1087         rt2x00lib_remove_hw(rt2x00dev);
1088
1089         /*
1090          * Free firmware image.
1091          */
1092         rt2x00lib_free_firmware(rt2x00dev);
1093
1094         /*
1095          * Free queue structures.
1096          */
1097         rt2x00queue_free(rt2x00dev);
1098 }
1099 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1100
1101 /*
1102  * Device state handlers
1103  */
1104 #ifdef CONFIG_PM
1105 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1106 {
1107         NOTICE(rt2x00dev, "Going to sleep.\n");
1108
1109         /*
1110          * Prevent mac80211 from accessing driver while suspended.
1111          */
1112         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1113                 return 0;
1114
1115         /*
1116          * Cleanup as much as possible.
1117          */
1118         rt2x00lib_uninitialize(rt2x00dev);
1119
1120         /*
1121          * Suspend/disable extra components.
1122          */
1123         rt2x00leds_suspend(rt2x00dev);
1124         rt2x00debug_deregister(rt2x00dev);
1125
1126         /*
1127          * Set device mode to sleep for power management,
1128          * on some hardware this call seems to consistently fail.
1129          * From the specifications it is hard to tell why it fails,
1130          * and if this is a "bad thing".
1131          * Overall it is safe to just ignore the failure and
1132          * continue suspending. The only downside is that the
1133          * device will not be in optimal power save mode, but with
1134          * the radio and the other components already disabled the
1135          * device is as good as disabled.
1136          */
1137         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1138                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1139                         "continue suspending.\n");
1140
1141         return 0;
1142 }
1143 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1144
1145 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1146 {
1147         NOTICE(rt2x00dev, "Waking up.\n");
1148
1149         /*
1150          * Restore/enable extra components.
1151          */
1152         rt2x00debug_register(rt2x00dev);
1153         rt2x00leds_resume(rt2x00dev);
1154
1155         /*
1156          * We are ready again to receive requests from mac80211.
1157          */
1158         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1159
1160         return 0;
1161 }
1162 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1163 #endif /* CONFIG_PM */
1164
1165 /*
1166  * rt2x00lib module information.
1167  */
1168 MODULE_AUTHOR(DRV_PROJECT);
1169 MODULE_VERSION(DRV_VERSION);
1170 MODULE_DESCRIPTION("rt2x00 library");
1171 MODULE_LICENSE("GPL");