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 queues.
  70          */
  71         rt2x00queue_start_queues(rt2x00dev);
  72         rt2x00link_start_tuner(rt2x00dev);
  73
  74         /*
  75          * Start watchdog monitoring.
  76          */
  77         rt2x00link_start_watchdog(rt2x00dev);
  78
  79         return 0;
  80 }
  81
  82 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
  83 {
  84         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  85                 return;
  86
  87         /*
  88          * Stop watchdog monitoring.
  89          */
  90         rt2x00link_stop_watchdog(rt2x00dev);
  91
  92         /*
  93          * Stop all queues
  94          */
  95         rt2x00link_stop_tuner(rt2x00dev);
  96         rt2x00queue_stop_queues(rt2x00dev);
  97         rt2x00queue_flush_queues(rt2x00dev, true);
  98
  99         /*
 100          * Disable radio.
 101          */
 102         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 103         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 104         rt2x00led_led_activity(rt2x00dev, false);
 105         rt2x00leds_led_radio(rt2x00dev, false);
 106 }
 107
 108 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 109                                           struct ieee80211_vif *vif)
 110 {
 111         struct rt2x00_dev *rt2x00dev = data;
 112         struct rt2x00_intf *intf = vif_to_intf(vif);
 113
 114         /*
 115          * It is possible the radio was disabled while the work had been
 116          * scheduled. If that happens we should return here immediately,
 117          * note that in the spinlock protected area above the delayed_flags
 118          * have been cleared correctly.
 119          */
 120         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 121                 return;
 122
 123         if (test_and_clear_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags))
 124                 rt2x00queue_update_beacon(rt2x00dev, vif, true);
 125 }
 126
 127 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 128 {
 129         struct rt2x00_dev *rt2x00dev =
 130             container_of(work, struct rt2x00_dev, intf_work);
 131
 132         /*
 133          * Iterate over each interface and perform the
 134          * requested configurations.
 135          */
 136         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 137                                             rt2x00lib_intf_scheduled_iter,
 138                                             rt2x00dev);
 139 }
 140
 141 /*
 142  * Interrupt context handlers.
 143  */
 144 static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac,
 145                                      struct ieee80211_vif *vif)
 146 {
 147         struct rt2x00_dev *rt2x00dev = data;
 148         struct sk_buff *skb;
 149
 150         /*
 151          * Only AP mode interfaces do broad- and multicast buffering
 152          */
 153         if (vif->type != NL80211_IFTYPE_AP)
 154                 return;
 155
 156         /*
 157          * Send out buffered broad- and multicast frames
 158          */
 159         skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 160         while (skb) {
 161                 rt2x00mac_tx(rt2x00dev->hw, skb);
 162                 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 163         }
 164 }
 165
 166 static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac,
 167                                         struct ieee80211_vif *vif)
 168 {
 169         struct rt2x00_dev *rt2x00dev = data;
 170
 171         if (vif->type != NL80211_IFTYPE_AP &&
 172             vif->type != NL80211_IFTYPE_ADHOC &&
 173             vif->type != NL80211_IFTYPE_MESH_POINT &&
 174             vif->type != NL80211_IFTYPE_WDS)
 175                 return;
 176
 177         rt2x00queue_update_beacon(rt2x00dev, vif, true);
 178 }
 179
 180 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 181 {
 182         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 183                 return;
 184
 185         /* send buffered bc/mc frames out for every bssid */
 186         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 187                                             rt2x00lib_bc_buffer_iter,
 188                                             rt2x00dev);
 189         /*
 190          * Devices with pre tbtt interrupt don't need to update the beacon
 191          * here as they will fetch the next beacon directly prior to
 192          * transmission.
 193          */
 194         if (test_bit(DRIVER_SUPPORT_PRE_TBTT_INTERRUPT, &rt2x00dev->flags))
 195                 return;
 196
 197         /* fetch next beacon */
 198         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 199                                             rt2x00lib_beaconupdate_iter,
 200                                             rt2x00dev);
 201 }
 202 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 203
 204 void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev)
 205 {
 206         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 207                 return;
 208
 209         /* fetch next beacon */
 210         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 211                                             rt2x00lib_beaconupdate_iter,
 212                                             rt2x00dev);
 213 }
 214 EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
 215
 216 void rt2x00lib_dmastart(struct queue_entry *entry)
 217 {
 218         set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 219         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 220 }
 221 EXPORT_SYMBOL_GPL(rt2x00lib_dmastart);
 222
 223 void rt2x00lib_dmadone(struct queue_entry *entry)
 224 {
 225         set_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags);
 226         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 227         rt2x00queue_index_inc(entry->queue, Q_INDEX_DMA_DONE);
 228 }
 229 EXPORT_SYMBOL_GPL(rt2x00lib_dmadone);
 230
 231 void rt2x00lib_txdone(struct queue_entry *entry,
 232                       struct txdone_entry_desc *txdesc)
 233 {
 234         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 235         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 236         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 237         unsigned int header_length, i;
 238         u8 rate_idx, rate_flags, retry_rates;
 239         u8 skbdesc_flags = skbdesc->flags;
 240         bool success;
 241
 242         /*
 243          * Unmap the skb.
 244          */
 245         rt2x00queue_unmap_skb(entry);
 246
 247         /*
 248          * Remove the extra tx headroom from the skb.
 249          */
 250         skb_pull(entry->skb, rt2x00dev->ops->extra_tx_headroom);
 251
 252         /*
 253          * Signal that the TX descriptor is no longer in the skb.
 254          */
 255         skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
 256
 257         /*
 258          * Determine the length of 802.11 header.
 259          */
 260         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 261
 262         /*
 263          * Remove L2 padding which was added during
 264          */
 265         if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
 266                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 267
 268         /*
 269          * If the IV/EIV data was stripped from the frame before it was
 270          * passed to the hardware, we should now reinsert it again because
 271          * mac80211 will expect the same data to be present it the
 272          * frame as it was passed to us.
 273          */
 274         if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
 275                 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
 276
 277         /*
 278          * Send frame to debugfs immediately, after this call is completed
 279          * we are going to overwrite the skb->cb array.
 280          */
 281         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 282
 283         /*
 284          * Determine if the frame has been successfully transmitted.
 285          */
 286         success =
 287             test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 288             test_bit(TXDONE_UNKNOWN, &txdesc->flags);
 289
 290         /*
 291          * Update TX statistics.
 292          */
 293         rt2x00dev->link.qual.tx_success += success;
 294         rt2x00dev->link.qual.tx_failed += !success;
 295
 296         rate_idx = skbdesc->tx_rate_idx;
 297         rate_flags = skbdesc->tx_rate_flags;
 298         retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
 299             (txdesc->retry + 1) : 1;
 300
 301         /*
 302          * Initialize TX status
 303          */
 304         memset(&tx_info->status, 0, sizeof(tx_info->status));
 305         tx_info->status.ack_signal = 0;
 306
 307         /*
 308          * Frame was send with retries, hardware tried
 309          * different rates to send out the frame, at each
 310          * retry it lowered the rate 1 step except when the
 311          * lowest rate was used.
 312          */
 313         for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
 314                 tx_info->status.rates[i].idx = rate_idx - i;
 315                 tx_info->status.rates[i].flags = rate_flags;
 316
 317                 if (rate_idx - i == 0) {
 318                         /*
 319                          * The lowest rate (index 0) was used until the
 320                          * number of max retries was reached.
 321                          */
 322                         tx_info->status.rates[i].count = retry_rates - i;
 323                         i++;
 324                         break;
 325                 }
 326                 tx_info->status.rates[i].count = 1;
 327         }
 328         if (i < (IEEE80211_TX_MAX_RATES - 1))
 329                 tx_info->status.rates[i].idx = -1; /* terminate */
 330
 331         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 332                 if (success)
 333                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 334                 else
 335                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 336         }
 337
 338         /*
 339          * Every single frame has it's own tx status, hence report
 340          * every frame as ampdu of size 1.
 341          *
 342          * TODO: if we can find out how many frames were aggregated
 343          * by the hw we could provide the real ampdu_len to mac80211
 344          * which would allow the rc algorithm to better decide on
 345          * which rates are suitable.
 346          */
 347         if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 348                 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
 349                 tx_info->status.ampdu_len = 1;
 350                 tx_info->status.ampdu_ack_len = success ? 1 : 0;
 351         }
 352
 353         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 354                 if (success)
 355                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 356                 else
 357                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 358         }
 359
 360         /*
 361          * Only send the status report to mac80211 when it's a frame
 362          * that originated in mac80211. If this was a extra frame coming
 363          * through a mac80211 library call (RTS/CTS) then we should not
 364          * send the status report back.
 365          */
 366         if (!(skbdesc_flags & SKBDESC_NOT_MAC80211)) {
 367                 if (test_bit(DRIVER_REQUIRE_TASKLET_CONTEXT, &rt2x00dev->flags))
 368                         ieee80211_tx_status(rt2x00dev->hw, entry->skb);
 369                 else
 370                         ieee80211_tx_status_ni(rt2x00dev->hw, entry->skb);
 371         } else
 372                 dev_kfree_skb_any(entry->skb);
 373
 374         /*
 375          * Make this entry available for reuse.
 376          */
 377         entry->skb = NULL;
 378         entry->flags = 0;
 379
 380         rt2x00dev->ops->lib->clear_entry(entry);
 381
 382         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 383
 384         /*
 385          * If the data queue was below the threshold before the txdone
 386          * handler we must make sure the packet queue in the mac80211 stack
 387          * is reenabled when the txdone handler has finished.
 388          */
 389         if (!rt2x00queue_threshold(entry->queue))
 390                 rt2x00queue_unpause_queue(entry->queue);
 391 }
 392 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 393
 394 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
 395 {
 396         struct txdone_entry_desc txdesc;
 397
 398         txdesc.flags = 0;
 399         __set_bit(status, &txdesc.flags);
 400         txdesc.retry = 0;
 401
 402         rt2x00lib_txdone(entry, &txdesc);
 403 }
 404 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
 405
 406 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 407                                         struct rxdone_entry_desc *rxdesc)
 408 {
 409         struct ieee80211_supported_band *sband;
 410         const struct rt2x00_rate *rate;
 411         unsigned int i;
 412         int signal = rxdesc->signal;
 413         int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 414
 415         switch (rxdesc->rate_mode) {
 416         case RATE_MODE_CCK:
 417         case RATE_MODE_OFDM:
 418                 /*
 419                  * For non-HT rates the MCS value needs to contain the
 420                  * actually used rate modulation (CCK or OFDM).
 421                  */
 422                 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 423                         signal = RATE_MCS(rxdesc->rate_mode, signal);
 424
 425                 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 426                 for (i = 0; i < sband->n_bitrates; i++) {
 427                         rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 428                         if (((type == RXDONE_SIGNAL_PLCP) &&
 429                              (rate->plcp == signal)) ||
 430                             ((type == RXDONE_SIGNAL_BITRATE) &&
 431                               (rate->bitrate == signal)) ||
 432                             ((type == RXDONE_SIGNAL_MCS) &&
 433                               (rate->mcs == signal))) {
 434                                 return i;
 435                         }
 436                 }
 437                 break;
 438         case RATE_MODE_HT_MIX:
 439         case RATE_MODE_HT_GREENFIELD:
 440                 if (signal >= 0 && signal <= 76)
 441                         return signal;
 442                 break;
 443         default:
 444                 break;
 445         }
 446
 447         WARNING(rt2x00dev, "Frame received with unrecognized signal, "
 448                 "mode=0x%.4x, signal=0x%.4x, type=%d.\n",
 449                 rxdesc->rate_mode, signal, type);
 450         return 0;
 451 }
 452
 453 void rt2x00lib_rxdone(struct queue_entry *entry)
 454 {
 455         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 456         struct rxdone_entry_desc rxdesc;
 457         struct sk_buff *skb;
 458         struct ieee80211_rx_status *rx_status;
 459         unsigned int header_length;
 460         int rate_idx;
 461
 462         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 463             !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 464                 goto submit_entry;
 465
 466         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 467                 goto submit_entry;
 468
 469         /*
 470          * Allocate a new sk_buffer. If no new buffer available, drop the
 471          * received frame and reuse the existing buffer.
 472          */
 473         skb = rt2x00queue_alloc_rxskb(entry);
 474         if (!skb)
 475                 goto submit_entry;
 476
 477         /*
 478          * Unmap the skb.
 479          */
 480         rt2x00queue_unmap_skb(entry);
 481
 482         /*
 483          * Extract the RXD details.
 484          */
 485         memset(&rxdesc, 0, sizeof(rxdesc));
 486         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 487
 488         /*
 489          * The data behind the ieee80211 header must be
 490          * aligned on a 4 byte boundary.
 491          */
 492         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 493
 494         /*
 495          * Hardware might have stripped the IV/EIV/ICV data,
 496          * in that case it is possible that the data was
 497          * provided separately (through hardware descriptor)
 498          * in which case we should reinsert the data into the frame.
 499          */
 500         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 501             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 502                 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
 503                                           &rxdesc);
 504         else if (header_length &&
 505                  (rxdesc.size > header_length) &&
 506                  (rxdesc.dev_flags & RXDONE_L2PAD))
 507                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 508         else
 509                 rt2x00queue_align_payload(entry->skb, header_length);
 510
 511         /* Trim buffer to correct size */
 512         skb_trim(entry->skb, rxdesc.size);
 513
 514         /*
 515          * Translate the signal to the correct bitrate index.
 516          */
 517         rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 518         if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
 519             rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
 520                 rxdesc.flags |= RX_FLAG_HT;
 521
 522         /*
 523          * Update extra components
 524          */
 525         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 526         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 527         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 528
 529         /*
 530          * Initialize RX status information, and send frame
 531          * to mac80211.
 532          */
 533         rx_status = IEEE80211_SKB_RXCB(entry->skb);
 534         rx_status->mactime = rxdesc.timestamp;
 535         rx_status->band = rt2x00dev->curr_band;
 536         rx_status->freq = rt2x00dev->curr_freq;
 537         rx_status->rate_idx = rate_idx;
 538         rx_status->signal = rxdesc.rssi;
 539         rx_status->flag = rxdesc.flags;
 540         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 541
 542         ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
 543
 544         /*
 545          * Replace the skb with the freshly allocated one.
 546          */
 547         entry->skb = skb;
 548
 549 submit_entry:
 550         entry->flags = 0;
 551         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 552         if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
 553             test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 554                 rt2x00dev->ops->lib->clear_entry(entry);
 555 }
 556 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 557
 558 /*
 559  * Driver initialization handlers.
 560  */
 561 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 562         {
 563                 .flags = DEV_RATE_CCK,
 564                 .bitrate = 10,
 565                 .ratemask = BIT(0),
 566                 .plcp = 0x00,
 567                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 568         },
 569         {
 570                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 571                 .bitrate = 20,
 572                 .ratemask = BIT(1),
 573                 .plcp = 0x01,
 574                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 575         },
 576         {
 577                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 578                 .bitrate = 55,
 579                 .ratemask = BIT(2),
 580                 .plcp = 0x02,
 581                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 582         },
 583         {
 584                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 585                 .bitrate = 110,
 586                 .ratemask = BIT(3),
 587                 .plcp = 0x03,
 588                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 589         },
 590         {
 591                 .flags = DEV_RATE_OFDM,
 592                 .bitrate = 60,
 593                 .ratemask = BIT(4),
 594                 .plcp = 0x0b,
 595                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 596         },
 597         {
 598                 .flags = DEV_RATE_OFDM,
 599                 .bitrate = 90,
 600                 .ratemask = BIT(5),
 601                 .plcp = 0x0f,
 602                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 603         },
 604         {
 605                 .flags = DEV_RATE_OFDM,
 606                 .bitrate = 120,
 607                 .ratemask = BIT(6),
 608                 .plcp = 0x0a,
 609                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 610         },
 611         {
 612                 .flags = DEV_RATE_OFDM,
 613                 .bitrate = 180,
 614                 .ratemask = BIT(7),
 615                 .plcp = 0x0e,
 616                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 617         },
 618         {
 619                 .flags = DEV_RATE_OFDM,
 620                 .bitrate = 240,
 621                 .ratemask = BIT(8),
 622                 .plcp = 0x09,
 623                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 624         },
 625         {
 626                 .flags = DEV_RATE_OFDM,
 627                 .bitrate = 360,
 628                 .ratemask = BIT(9),
 629                 .plcp = 0x0d,
 630                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 631         },
 632         {
 633                 .flags = DEV_RATE_OFDM,
 634                 .bitrate = 480,
 635                 .ratemask = BIT(10),
 636                 .plcp = 0x08,
 637                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 638         },
 639         {
 640                 .flags = DEV_RATE_OFDM,
 641                 .bitrate = 540,
 642                 .ratemask = BIT(11),
 643                 .plcp = 0x0c,
 644                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 645         },
 646 };
 647
 648 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 649                               const int channel, const int tx_power,
 650                               const int value)
 651 {
 652         /* XXX: this assumption about the band is wrong for 802.11j */
 653         entry->band = channel <= 14 ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 654         entry->center_freq = ieee80211_channel_to_frequency(channel,
 655                                                             entry->band);
 656         entry->hw_value = value;
 657         entry->max_power = tx_power;
 658         entry->max_antenna_gain = 0xff;
 659 }
 660
 661 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 662                            const u16 index, const struct rt2x00_rate *rate)
 663 {
 664         entry->flags = 0;
 665         entry->bitrate = rate->bitrate;
 666         entry->hw_value = index;
 667         entry->hw_value_short = index;
 668
 669         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 670                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 671 }
 672
 673 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 674                                     struct hw_mode_spec *spec)
 675 {
 676         struct ieee80211_hw *hw = rt2x00dev->hw;
 677         struct ieee80211_channel *channels;
 678         struct ieee80211_rate *rates;
 679         unsigned int num_rates;
 680         unsigned int i;
 681
 682         num_rates = 0;
 683         if (spec->supported_rates & SUPPORT_RATE_CCK)
 684                 num_rates += 4;
 685         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 686                 num_rates += 8;
 687
 688         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 689         if (!channels)
 690                 return -ENOMEM;
 691
 692         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 693         if (!rates)
 694                 goto exit_free_channels;
 695
 696         /*
 697          * Initialize Rate list.
 698          */
 699         for (i = 0; i < num_rates; i++)
 700                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 701
 702         /*
 703          * Initialize Channel list.
 704          */
 705         for (i = 0; i < spec->num_channels; i++) {
 706                 rt2x00lib_channel(&channels[i],
 707                                   spec->channels[i].channel,
 708                                   spec->channels_info[i].max_power, i);
 709         }
 710
 711         /*
 712          * Intitialize 802.11b, 802.11g
 713          * Rates: CCK, OFDM.
 714          * Channels: 2.4 GHz
 715          */
 716         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 717                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 718                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 719                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 720                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 721                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 722                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 723                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
 724                        &spec->ht, sizeof(spec->ht));
 725         }
 726
 727         /*
 728          * Intitialize 802.11a
 729          * Rates: OFDM.
 730          * Channels: OFDM, UNII, HiperLAN2.
 731          */
 732         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 733                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 734                     spec->num_channels - 14;
 735                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 736                     num_rates - 4;
 737                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 738                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 739                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 740                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 741                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
 742                        &spec->ht, sizeof(spec->ht));
 743         }
 744
 745         return 0;
 746
 747  exit_free_channels:
 748         kfree(channels);
 749         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 750         return -ENOMEM;
 751 }
 752
 753 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 754 {
 755         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 756                 ieee80211_unregister_hw(rt2x00dev->hw);
 757
 758         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 759                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 760                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 761                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 762                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 763         }
 764
 765         kfree(rt2x00dev->spec.channels_info);
 766 }
 767
 768 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 769 {
 770         struct hw_mode_spec *spec = &rt2x00dev->spec;
 771         int status;
 772
 773         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 774                 return 0;
 775
 776         /*
 777          * Initialize HW modes.
 778          */
 779         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 780         if (status)
 781                 return status;
 782
 783         /*
 784          * Initialize HW fields.
 785          */
 786         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 787
 788         /*
 789          * Initialize extra TX headroom required.
 790          */
 791         rt2x00dev->hw->extra_tx_headroom =
 792                 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
 793                       rt2x00dev->ops->extra_tx_headroom);
 794
 795         /*
 796          * Take TX headroom required for alignment into account.
 797          */
 798         if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
 799                 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
 800         else if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags))
 801                 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
 802
 803         /*
 804          * Allocate tx status FIFO for driver use.
 805          */
 806         if (test_bit(DRIVER_REQUIRE_TXSTATUS_FIFO, &rt2x00dev->flags)) {
 807                 /*
 808                  * Allocate txstatus fifo and tasklet, we use a size of 512
 809                  * for the kfifo which is big enough to store 512/4=128 tx
 810                  * status reports. In the worst case (tx status for all tx
 811                  * queues gets reported before we've got a chance to handle
 812                  * them) 24*4=384 tx status reports need to be cached.
 813                  */
 814                 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, 512,
 815                                      GFP_KERNEL);
 816                 if (status)
 817                         return status;
 818
 819                 /* tasklet for processing the tx status reports. */
 820                 if (rt2x00dev->ops->lib->txstatus_tasklet)
 821                         tasklet_init(&rt2x00dev->txstatus_tasklet,
 822                                      rt2x00dev->ops->lib->txstatus_tasklet,
 823                                      (unsigned long)rt2x00dev);
 824
 825         }
 826
 827         /*
 828          * Register HW.
 829          */
 830         status = ieee80211_register_hw(rt2x00dev->hw);
 831         if (status)
 832                 return status;
 833
 834         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 835
 836         return 0;
 837 }
 838
 839 /*
 840  * Initialization/uninitialization handlers.
 841  */
 842 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 843 {
 844         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 845                 return;
 846
 847         /*
 848          * Unregister extra components.
 849          */
 850         rt2x00rfkill_unregister(rt2x00dev);
 851
 852         /*
 853          * Allow the HW to uninitialize.
 854          */
 855         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 856
 857         /*
 858          * Free allocated queue entries.
 859          */
 860         rt2x00queue_uninitialize(rt2x00dev);
 861 }
 862
 863 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 864 {
 865         int status;
 866
 867         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 868                 return 0;
 869
 870         /*
 871          * Allocate all queue entries.
 872          */
 873         status = rt2x00queue_initialize(rt2x00dev);
 874         if (status)
 875                 return status;
 876
 877         /*
 878          * Initialize the device.
 879          */
 880         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 881         if (status) {
 882                 rt2x00queue_uninitialize(rt2x00dev);
 883                 return status;
 884         }
 885
 886         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
 887
 888         /*
 889          * Register the extra components.
 890          */
 891         rt2x00rfkill_register(rt2x00dev);
 892
 893         return 0;
 894 }
 895
 896 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 897 {
 898         int retval;
 899
 900         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 901                 return 0;
 902
 903         /*
 904          * If this is the first interface which is added,
 905          * we should load the firmware now.
 906          */
 907         retval = rt2x00lib_load_firmware(rt2x00dev);
 908         if (retval)
 909                 return retval;
 910
 911         /*
 912          * Initialize the device.
 913          */
 914         retval = rt2x00lib_initialize(rt2x00dev);
 915         if (retval)
 916                 return retval;
 917
 918         rt2x00dev->intf_ap_count = 0;
 919         rt2x00dev->intf_sta_count = 0;
 920         rt2x00dev->intf_associated = 0;
 921
 922         /* Enable the radio */
 923         retval = rt2x00lib_enable_radio(rt2x00dev);
 924         if (retval)
 925                 return retval;
 926
 927         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
 928
 929         return 0;
 930 }
 931
 932 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
 933 {
 934         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 935                 return;
 936
 937         /*
 938          * Perhaps we can add something smarter here,
 939          * but for now just disabling the radio should do.
 940          */
 941         rt2x00lib_disable_radio(rt2x00dev);
 942
 943         rt2x00dev->intf_ap_count = 0;
 944         rt2x00dev->intf_sta_count = 0;
 945         rt2x00dev->intf_associated = 0;
 946 }
 947
 948 /*
 949  * driver allocation handlers.
 950  */
 951 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 952 {
 953         int retval = -ENOMEM;
 954
 955         mutex_init(&rt2x00dev->csr_mutex);
 956
 957         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 958
 959         /*
 960          * Make room for rt2x00_intf inside the per-interface
 961          * structure ieee80211_vif.
 962          */
 963         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
 964
 965         /*
 966          * Determine which operating modes are supported, all modes
 967          * which require beaconing, depend on the availability of
 968          * beacon entries.
 969          */
 970         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
 971         if (rt2x00dev->ops->bcn->entry_num > 0)
 972                 rt2x00dev->hw->wiphy->interface_modes |=
 973                     BIT(NL80211_IFTYPE_ADHOC) |
 974                     BIT(NL80211_IFTYPE_AP) |
 975                     BIT(NL80211_IFTYPE_MESH_POINT) |
 976                     BIT(NL80211_IFTYPE_WDS);
 977
 978         /*
 979          * Initialize configuration work.
 980          */
 981         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
 982
 983         /*
 984          * Let the driver probe the device to detect the capabilities.
 985          */
 986         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
 987         if (retval) {
 988                 ERROR(rt2x00dev, "Failed to allocate device.\n");
 989                 goto exit;
 990         }
 991
 992         /*
 993          * Allocate queue array.
 994          */
 995         retval = rt2x00queue_allocate(rt2x00dev);
 996         if (retval)
 997                 goto exit;
 998
 999         /*
1000          * Initialize ieee80211 structure.
1001          */
1002         retval = rt2x00lib_probe_hw(rt2x00dev);
1003         if (retval) {
1004                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1005                 goto exit;
1006         }
1007
1008         /*
1009          * Register extra components.
1010          */
1011         rt2x00link_register(rt2x00dev);
1012         rt2x00leds_register(rt2x00dev);
1013         rt2x00debug_register(rt2x00dev);
1014
1015         return 0;
1016
1017 exit:
1018         rt2x00lib_remove_dev(rt2x00dev);
1019
1020         return retval;
1021 }
1022 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1023
1024 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1025 {
1026         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1027
1028         /*
1029          * Disable radio.
1030          */
1031         rt2x00lib_disable_radio(rt2x00dev);
1032
1033         /*
1034          * Stop all work.
1035          */
1036         cancel_work_sync(&rt2x00dev->intf_work);
1037         cancel_work_sync(&rt2x00dev->rxdone_work);
1038         cancel_work_sync(&rt2x00dev->txdone_work);
1039
1040         /*
1041          * Free the tx status fifo.
1042          */
1043         kfifo_free(&rt2x00dev->txstatus_fifo);
1044
1045         /*
1046          * Kill the tx status tasklet.
1047          */
1048         tasklet_kill(&rt2x00dev->txstatus_tasklet);
1049
1050         /*
1051          * Uninitialize device.
1052          */
1053         rt2x00lib_uninitialize(rt2x00dev);
1054
1055         /*
1056          * Free extra components
1057          */
1058         rt2x00debug_deregister(rt2x00dev);
1059         rt2x00leds_unregister(rt2x00dev);
1060
1061         /*
1062          * Free ieee80211_hw memory.
1063          */
1064         rt2x00lib_remove_hw(rt2x00dev);
1065
1066         /*
1067          * Free firmware image.
1068          */
1069         rt2x00lib_free_firmware(rt2x00dev);
1070
1071         /*
1072          * Free queue structures.
1073          */
1074         rt2x00queue_free(rt2x00dev);
1075 }
1076 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1077
1078 /*
1079  * Device state handlers
1080  */
1081 #ifdef CONFIG_PM
1082 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1083 {
1084         NOTICE(rt2x00dev, "Going to sleep.\n");
1085
1086         /*
1087          * Prevent mac80211 from accessing driver while suspended.
1088          */
1089         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1090                 return 0;
1091
1092         /*
1093          * Cleanup as much as possible.
1094          */
1095         rt2x00lib_uninitialize(rt2x00dev);
1096
1097         /*
1098          * Suspend/disable extra components.
1099          */
1100         rt2x00leds_suspend(rt2x00dev);
1101         rt2x00debug_deregister(rt2x00dev);
1102
1103         /*
1104          * Set device mode to sleep for power management,
1105          * on some hardware this call seems to consistently fail.
1106          * From the specifications it is hard to tell why it fails,
1107          * and if this is a "bad thing".
1108          * Overall it is safe to just ignore the failure and
1109          * continue suspending. The only downside is that the
1110          * device will not be in optimal power save mode, but with
1111          * the radio and the other components already disabled the
1112          * device is as good as disabled.
1113          */
1114         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1115                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1116                         "continue suspending.\n");
1117
1118         return 0;
1119 }
1120 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1121
1122 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1123 {
1124         NOTICE(rt2x00dev, "Waking up.\n");
1125
1126         /*
1127          * Restore/enable extra components.
1128          */
1129         rt2x00debug_register(rt2x00dev);
1130         rt2x00leds_resume(rt2x00dev);
1131
1132         /*
1133          * We are ready again to receive requests from mac80211.
1134          */
1135         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1136
1137         return 0;
1138 }
1139 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1140 #endif /* CONFIG_PM */
1141
1142 /*
1143  * rt2x00lib module information.
1144  */
1145 MODULE_AUTHOR(DRV_PROJECT);
1146 MODULE_VERSION(DRV_VERSION);
1147 MODULE_DESCRIPTION("rt2x00 library");
1148 MODULE_LICENSE("GPL");