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