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 #include <linux/log2.h>
  31
  32 #include "rt2x00.h"
  33 #include "rt2x00lib.h"
  34
  35 /*
  36  * Utility functions.
  37  */
  38 u32 rt2x00lib_get_bssidx(struct rt2x00_dev *rt2x00dev,
  39                          struct ieee80211_vif *vif)
  40 {
  41         /*
  42          * When in STA mode, bssidx is always 0 otherwise local_address[5]
  43          * contains the bss number, see BSS_ID_MASK comments for details.
  44          */
  45         if (rt2x00dev->intf_sta_count)
  46                 return 0;
  47         return vif->addr[5] & (rt2x00dev->ops->max_ap_intf - 1);
  48 }
  49 EXPORT_SYMBOL_GPL(rt2x00lib_get_bssidx);
  50
  51 /*
  52  * Radio control handlers.
  53  */
  54 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  55 {
  56         int status;
  57
  58         /*
  59          * Don't enable the radio twice.
  60          * And check if the hardware button has been disabled.
  61          */
  62         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  63                 return 0;
  64
  65         /*
  66          * Initialize all data queues.
  67          */
  68         rt2x00queue_init_queues(rt2x00dev);
  69
  70         /*
  71          * Enable radio.
  72          */
  73         status =
  74             rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
  75         if (status)
  76                 return status;
  77
  78         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
  79
  80         rt2x00leds_led_radio(rt2x00dev, true);
  81         rt2x00led_led_activity(rt2x00dev, true);
  82
  83         set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
  84
  85         /*
  86          * Enable queues.
  87          */
  88         rt2x00queue_start_queues(rt2x00dev);
  89         rt2x00link_start_tuner(rt2x00dev);
  90         rt2x00link_start_agc(rt2x00dev);
  91
  92         /*
  93          * Start watchdog monitoring.
  94          */
  95         rt2x00link_start_watchdog(rt2x00dev);
  96
  97         return 0;
  98 }
  99
 100 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
 101 {
 102         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 103                 return;
 104
 105         /*
 106          * Stop watchdog monitoring.
 107          */
 108         rt2x00link_stop_watchdog(rt2x00dev);
 109
 110         /*
 111          * Stop all queues
 112          */
 113         rt2x00link_stop_agc(rt2x00dev);
 114         rt2x00link_stop_tuner(rt2x00dev);
 115         rt2x00queue_stop_queues(rt2x00dev);
 116         rt2x00queue_flush_queues(rt2x00dev, true);
 117
 118         /*
 119          * Disable radio.
 120          */
 121         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 122         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 123         rt2x00led_led_activity(rt2x00dev, false);
 124         rt2x00leds_led_radio(rt2x00dev, false);
 125 }
 126
 127 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 128                                           struct ieee80211_vif *vif)
 129 {
 130         struct rt2x00_dev *rt2x00dev = data;
 131         struct rt2x00_intf *intf = vif_to_intf(vif);
 132
 133         /*
 134          * It is possible the radio was disabled while the work had been
 135          * scheduled. If that happens we should return here immediately,
 136          * note that in the spinlock protected area above the delayed_flags
 137          * have been cleared correctly.
 138          */
 139         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 140                 return;
 141
 142         if (test_and_clear_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags))
 143                 rt2x00queue_update_beacon(rt2x00dev, vif);
 144 }
 145
 146 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 147 {
 148         struct rt2x00_dev *rt2x00dev =
 149             container_of(work, struct rt2x00_dev, intf_work);
 150
 151         /*
 152          * Iterate over each interface and perform the
 153          * requested configurations.
 154          */
 155         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 156                                             rt2x00lib_intf_scheduled_iter,
 157                                             rt2x00dev);
 158 }
 159
 160 static void rt2x00lib_autowakeup(struct work_struct *work)
 161 {
 162         struct rt2x00_dev *rt2x00dev =
 163             container_of(work, struct rt2x00_dev, autowakeup_work.work);
 164
 165         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 166                 return;
 167
 168         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_AWAKE))
 169                 ERROR(rt2x00dev, "Device failed to wakeup.\n");
 170         clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
 171 }
 172
 173 /*
 174  * Interrupt context handlers.
 175  */
 176 static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac,
 177                                      struct ieee80211_vif *vif)
 178 {
 179         struct rt2x00_dev *rt2x00dev = data;
 180         struct sk_buff *skb;
 181
 182         /*
 183          * Only AP mode interfaces do broad- and multicast buffering
 184          */
 185         if (vif->type != NL80211_IFTYPE_AP)
 186                 return;
 187
 188         /*
 189          * Send out buffered broad- and multicast frames
 190          */
 191         skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 192         while (skb) {
 193                 rt2x00mac_tx(rt2x00dev->hw, skb);
 194                 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 195         }
 196 }
 197
 198 static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac,
 199                                         struct ieee80211_vif *vif)
 200 {
 201         struct rt2x00_dev *rt2x00dev = data;
 202
 203         if (vif->type != NL80211_IFTYPE_AP &&
 204             vif->type != NL80211_IFTYPE_ADHOC &&
 205             vif->type != NL80211_IFTYPE_MESH_POINT &&
 206             vif->type != NL80211_IFTYPE_WDS)
 207                 return;
 208
 209         /*
 210          * Update the beacon without locking. This is safe on PCI devices
 211          * as they only update the beacon periodically here. This should
 212          * never be called for USB devices.
 213          */
 214         WARN_ON(rt2x00_is_usb(rt2x00dev));
 215         rt2x00queue_update_beacon_locked(rt2x00dev, vif);
 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_atomic(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(CAPABILITY_PRE_TBTT_INTERRUPT, &rt2x00dev->cap_flags))
 233                 return;
 234
 235         /* fetch next beacon */
 236         ieee80211_iterate_active_interfaces_atomic(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_atomic(rt2x00dev->hw,
 249                                                    rt2x00lib_beaconupdate_iter,
 250                                                    rt2x00dev);
 251 }
 252 EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
 253
 254 void rt2x00lib_dmastart(struct queue_entry *entry)
 255 {
 256         set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 257         rt2x00queue_index_inc(entry, Q_INDEX);
 258 }
 259 EXPORT_SYMBOL_GPL(rt2x00lib_dmastart);
 260
 261 void rt2x00lib_dmadone(struct queue_entry *entry)
 262 {
 263         set_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags);
 264         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 265         rt2x00queue_index_inc(entry, Q_INDEX_DMA_DONE);
 266 }
 267 EXPORT_SYMBOL_GPL(rt2x00lib_dmadone);
 268
 269 void rt2x00lib_txdone(struct queue_entry *entry,
 270                       struct txdone_entry_desc *txdesc)
 271 {
 272         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 273         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 274         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 275         unsigned int header_length, i;
 276         u8 rate_idx, rate_flags, retry_rates;
 277         u8 skbdesc_flags = skbdesc->flags;
 278         bool success;
 279
 280         /*
 281          * Unmap the skb.
 282          */
 283         rt2x00queue_unmap_skb(entry);
 284
 285         /*
 286          * Remove the extra tx headroom from the skb.
 287          */
 288         skb_pull(entry->skb, rt2x00dev->ops->extra_tx_headroom);
 289
 290         /*
 291          * Signal that the TX descriptor is no longer in the skb.
 292          */
 293         skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
 294
 295         /*
 296          * Determine the length of 802.11 header.
 297          */
 298         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 299
 300         /*
 301          * Remove L2 padding which was added during
 302          */
 303         if (test_bit(REQUIRE_L2PAD, &rt2x00dev->cap_flags))
 304                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 305
 306         /*
 307          * If the IV/EIV data was stripped from the frame before it was
 308          * passed to the hardware, we should now reinsert it again because
 309          * mac80211 will expect the same data to be present it the
 310          * frame as it was passed to us.
 311          */
 312         if (test_bit(CAPABILITY_HW_CRYPTO, &rt2x00dev->cap_flags))
 313                 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
 314
 315         /*
 316          * Send frame to debugfs immediately, after this call is completed
 317          * we are going to overwrite the skb->cb array.
 318          */
 319         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 320
 321         /*
 322          * Determine if the frame has been successfully transmitted.
 323          */
 324         success =
 325             test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 326             test_bit(TXDONE_UNKNOWN, &txdesc->flags);
 327
 328         /*
 329          * Update TX statistics.
 330          */
 331         rt2x00dev->link.qual.tx_success += success;
 332         rt2x00dev->link.qual.tx_failed += !success;
 333
 334         rate_idx = skbdesc->tx_rate_idx;
 335         rate_flags = skbdesc->tx_rate_flags;
 336         retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
 337             (txdesc->retry + 1) : 1;
 338
 339         /*
 340          * Initialize TX status
 341          */
 342         memset(&tx_info->status, 0, sizeof(tx_info->status));
 343         tx_info->status.ack_signal = 0;
 344
 345         /*
 346          * Frame was send with retries, hardware tried
 347          * different rates to send out the frame, at each
 348          * retry it lowered the rate 1 step except when the
 349          * lowest rate was used.
 350          */
 351         for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
 352                 tx_info->status.rates[i].idx = rate_idx - i;
 353                 tx_info->status.rates[i].flags = rate_flags;
 354
 355                 if (rate_idx - i == 0) {
 356                         /*
 357                          * The lowest rate (index 0) was used until the
 358                          * number of max retries was reached.
 359                          */
 360                         tx_info->status.rates[i].count = retry_rates - i;
 361                         i++;
 362                         break;
 363                 }
 364                 tx_info->status.rates[i].count = 1;
 365         }
 366         if (i < (IEEE80211_TX_MAX_RATES - 1))
 367                 tx_info->status.rates[i].idx = -1; /* terminate */
 368
 369         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 370                 if (success)
 371                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 372                 else
 373                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 374         }
 375
 376         /*
 377          * Every single frame has it's own tx status, hence report
 378          * every frame as ampdu of size 1.
 379          *
 380          * TODO: if we can find out how many frames were aggregated
 381          * by the hw we could provide the real ampdu_len to mac80211
 382          * which would allow the rc algorithm to better decide on
 383          * which rates are suitable.
 384          */
 385         if (test_bit(TXDONE_AMPDU, &txdesc->flags) ||
 386             tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 387                 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
 388                 tx_info->status.ampdu_len = 1;
 389                 tx_info->status.ampdu_ack_len = success ? 1 : 0;
 390
 391                 if (!success)
 392                         tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
 393         }
 394
 395         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 396                 if (success)
 397                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 398                 else
 399                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 400         }
 401
 402         /*
 403          * Only send the status report to mac80211 when it's a frame
 404          * that originated in mac80211. If this was a extra frame coming
 405          * through a mac80211 library call (RTS/CTS) then we should not
 406          * send the status report back.
 407          */
 408         if (!(skbdesc_flags & SKBDESC_NOT_MAC80211)) {
 409                 if (test_bit(REQUIRE_TASKLET_CONTEXT, &rt2x00dev->cap_flags))
 410                         ieee80211_tx_status(rt2x00dev->hw, entry->skb);
 411                 else
 412                         ieee80211_tx_status_ni(rt2x00dev->hw, entry->skb);
 413         } else
 414                 dev_kfree_skb_any(entry->skb);
 415
 416         /*
 417          * Make this entry available for reuse.
 418          */
 419         entry->skb = NULL;
 420         entry->flags = 0;
 421
 422         rt2x00dev->ops->lib->clear_entry(entry);
 423
 424         rt2x00queue_index_inc(entry, Q_INDEX_DONE);
 425
 426         /*
 427          * If the data queue was below the threshold before the txdone
 428          * handler we must make sure the packet queue in the mac80211 stack
 429          * is reenabled when the txdone handler has finished. This has to be
 430          * serialized with rt2x00mac_tx(), otherwise we can wake up queue
 431          * before it was stopped.
 432          */
 433         spin_lock_bh(&entry->queue->tx_lock);
 434         if (!rt2x00queue_threshold(entry->queue))
 435                 rt2x00queue_unpause_queue(entry->queue);
 436         spin_unlock_bh(&entry->queue->tx_lock);
 437 }
 438 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 439
 440 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
 441 {
 442         struct txdone_entry_desc txdesc;
 443
 444         txdesc.flags = 0;
 445         __set_bit(status, &txdesc.flags);
 446         txdesc.retry = 0;
 447
 448         rt2x00lib_txdone(entry, &txdesc);
 449 }
 450 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
 451
 452 static u8 *rt2x00lib_find_ie(u8 *data, unsigned int len, u8 ie)
 453 {
 454         struct ieee80211_mgmt *mgmt = (void *)data;
 455         u8 *pos, *end;
 456
 457         pos = (u8 *)mgmt->u.beacon.variable;
 458         end = data + len;
 459         while (pos < end) {
 460                 if (pos + 2 + pos[1] > end)
 461                         return NULL;
 462
 463                 if (pos[0] == ie)
 464                         return pos;
 465
 466                 pos += 2 + pos[1];
 467         }
 468
 469         return NULL;
 470 }
 471
 472 static void rt2x00lib_sleep(struct work_struct *work)
 473 {
 474         struct rt2x00_dev *rt2x00dev =
 475             container_of(work, struct rt2x00_dev, sleep_work);
 476
 477         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 478                 return;
 479
 480         /*
 481          * Check again is powersaving is enabled, to prevent races from delayed
 482          * work execution.
 483          */
 484         if (!test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 485                 rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf,
 486                                  IEEE80211_CONF_CHANGE_PS);
 487 }
 488
 489 static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev,
 490                                       struct sk_buff *skb,
 491                                       struct rxdone_entry_desc *rxdesc)
 492 {
 493         struct ieee80211_hdr *hdr = (void *) skb->data;
 494         struct ieee80211_tim_ie *tim_ie;
 495         u8 *tim;
 496         u8 tim_len;
 497         bool cam;
 498
 499         /* If this is not a beacon, or if mac80211 has no powersaving
 500          * configured, or if the device is already in powersaving mode
 501          * we can exit now. */
 502         if (likely(!ieee80211_is_beacon(hdr->frame_control) ||
 503                    !(rt2x00dev->hw->conf.flags & IEEE80211_CONF_PS)))
 504                 return;
 505
 506         /* min. beacon length + FCS_LEN */
 507         if (skb->len <= 40 + FCS_LEN)
 508                 return;
 509
 510         /* and only beacons from the associated BSSID, please */
 511         if (!(rxdesc->dev_flags & RXDONE_MY_BSS) ||
 512             !rt2x00dev->aid)
 513                 return;
 514
 515         rt2x00dev->last_beacon = jiffies;
 516
 517         tim = rt2x00lib_find_ie(skb->data, skb->len - FCS_LEN, WLAN_EID_TIM);
 518         if (!tim)
 519                 return;
 520
 521         if (tim[1] < sizeof(*tim_ie))
 522                 return;
 523
 524         tim_len = tim[1];
 525         tim_ie = (struct ieee80211_tim_ie *) &tim[2];
 526
 527         /* Check whenever the PHY can be turned off again. */
 528
 529         /* 1. What about buffered unicast traffic for our AID? */
 530         cam = ieee80211_check_tim(tim_ie, tim_len, rt2x00dev->aid);
 531
 532         /* 2. Maybe the AP wants to send multicast/broadcast data? */
 533         cam |= (tim_ie->bitmap_ctrl & 0x01);
 534
 535         if (!cam && !test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 536                 queue_work(rt2x00dev->workqueue, &rt2x00dev->sleep_work);
 537 }
 538
 539 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 540                                         struct rxdone_entry_desc *rxdesc)
 541 {
 542         struct ieee80211_supported_band *sband;
 543         const struct rt2x00_rate *rate;
 544         unsigned int i;
 545         int signal = rxdesc->signal;
 546         int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 547
 548         switch (rxdesc->rate_mode) {
 549         case RATE_MODE_CCK:
 550         case RATE_MODE_OFDM:
 551                 /*
 552                  * For non-HT rates the MCS value needs to contain the
 553                  * actually used rate modulation (CCK or OFDM).
 554                  */
 555                 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 556                         signal = RATE_MCS(rxdesc->rate_mode, signal);
 557
 558                 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 559                 for (i = 0; i < sband->n_bitrates; i++) {
 560                         rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 561                         if (((type == RXDONE_SIGNAL_PLCP) &&
 562                              (rate->plcp == signal)) ||
 563                             ((type == RXDONE_SIGNAL_BITRATE) &&
 564                               (rate->bitrate == signal)) ||
 565                             ((type == RXDONE_SIGNAL_MCS) &&
 566                               (rate->mcs == signal))) {
 567                                 return i;
 568                         }
 569                 }
 570                 break;
 571         case RATE_MODE_HT_MIX:
 572         case RATE_MODE_HT_GREENFIELD:
 573                 if (signal >= 0 && signal <= 76)
 574                         return signal;
 575                 break;
 576         default:
 577                 break;
 578         }
 579
 580         WARNING(rt2x00dev, "Frame received with unrecognized signal, "
 581                 "mode=0x%.4x, signal=0x%.4x, type=%d.\n",
 582                 rxdesc->rate_mode, signal, type);
 583         return 0;
 584 }
 585
 586 void rt2x00lib_rxdone(struct queue_entry *entry)
 587 {
 588         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 589         struct rxdone_entry_desc rxdesc;
 590         struct sk_buff *skb;
 591         struct ieee80211_rx_status *rx_status;
 592         unsigned int header_length;
 593         int rate_idx;
 594
 595         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 596             !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 597                 goto submit_entry;
 598
 599         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 600                 goto submit_entry;
 601
 602         /*
 603          * Allocate a new sk_buffer. If no new buffer available, drop the
 604          * received frame and reuse the existing buffer.
 605          */
 606         skb = rt2x00queue_alloc_rxskb(entry);
 607         if (!skb)
 608                 goto submit_entry;
 609
 610         /*
 611          * Unmap the skb.
 612          */
 613         rt2x00queue_unmap_skb(entry);
 614
 615         /*
 616          * Extract the RXD details.
 617          */
 618         memset(&rxdesc, 0, sizeof(rxdesc));
 619         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 620
 621         /*
 622          * Check for valid size in case we get corrupted descriptor from
 623          * hardware.
 624          */
 625         if (unlikely(rxdesc.size == 0 ||
 626                      rxdesc.size > entry->queue->data_size)) {
 627                 WARNING(rt2x00dev, "Wrong frame size %d max %d.\n",
 628                         rxdesc.size, entry->queue->data_size);
 629                 dev_kfree_skb(entry->skb);
 630                 goto renew_skb;
 631         }
 632
 633         /*
 634          * The data behind the ieee80211 header must be
 635          * aligned on a 4 byte boundary.
 636          */
 637         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 638
 639         /*
 640          * Hardware might have stripped the IV/EIV/ICV data,
 641          * in that case it is possible that the data was
 642          * provided separately (through hardware descriptor)
 643          * in which case we should reinsert the data into the frame.
 644          */
 645         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 646             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 647                 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
 648                                           &rxdesc);
 649         else if (header_length &&
 650                  (rxdesc.size > header_length) &&
 651                  (rxdesc.dev_flags & RXDONE_L2PAD))
 652                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 653
 654         /* Trim buffer to correct size */
 655         skb_trim(entry->skb, rxdesc.size);
 656
 657         /*
 658          * Translate the signal to the correct bitrate index.
 659          */
 660         rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 661         if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
 662             rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
 663                 rxdesc.flags |= RX_FLAG_HT;
 664
 665         /*
 666          * Check if this is a beacon, and more frames have been
 667          * buffered while we were in powersaving mode.
 668          */
 669         rt2x00lib_rxdone_check_ps(rt2x00dev, entry->skb, &rxdesc);
 670
 671         /*
 672          * Update extra components
 673          */
 674         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 675         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 676         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 677
 678         /*
 679          * Initialize RX status information, and send frame
 680          * to mac80211.
 681          */
 682         rx_status = IEEE80211_SKB_RXCB(entry->skb);
 683         rx_status->mactime = rxdesc.timestamp;
 684         rx_status->band = rt2x00dev->curr_band;
 685         rx_status->freq = rt2x00dev->curr_freq;
 686         rx_status->rate_idx = rate_idx;
 687         rx_status->signal = rxdesc.rssi;
 688         rx_status->flag = rxdesc.flags;
 689         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 690
 691         ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
 692
 693 renew_skb:
 694         /*
 695          * Replace the skb with the freshly allocated one.
 696          */
 697         entry->skb = skb;
 698
 699 submit_entry:
 700         entry->flags = 0;
 701         rt2x00queue_index_inc(entry, Q_INDEX_DONE);
 702         if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
 703             test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 704                 rt2x00dev->ops->lib->clear_entry(entry);
 705 }
 706 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 707
 708 /*
 709  * Driver initialization handlers.
 710  */
 711 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 712         {
 713                 .flags = DEV_RATE_CCK,
 714                 .bitrate = 10,
 715                 .ratemask = BIT(0),
 716                 .plcp = 0x00,
 717                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 718         },
 719         {
 720                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 721                 .bitrate = 20,
 722                 .ratemask = BIT(1),
 723                 .plcp = 0x01,
 724                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 725         },
 726         {
 727                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 728                 .bitrate = 55,
 729                 .ratemask = BIT(2),
 730                 .plcp = 0x02,
 731                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 732         },
 733         {
 734                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 735                 .bitrate = 110,
 736                 .ratemask = BIT(3),
 737                 .plcp = 0x03,
 738                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 739         },
 740         {
 741                 .flags = DEV_RATE_OFDM,
 742                 .bitrate = 60,
 743                 .ratemask = BIT(4),
 744                 .plcp = 0x0b,
 745                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 746         },
 747         {
 748                 .flags = DEV_RATE_OFDM,
 749                 .bitrate = 90,
 750                 .ratemask = BIT(5),
 751                 .plcp = 0x0f,
 752                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 753         },
 754         {
 755                 .flags = DEV_RATE_OFDM,
 756                 .bitrate = 120,
 757                 .ratemask = BIT(6),
 758                 .plcp = 0x0a,
 759                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 760         },
 761         {
 762                 .flags = DEV_RATE_OFDM,
 763                 .bitrate = 180,
 764                 .ratemask = BIT(7),
 765                 .plcp = 0x0e,
 766                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 767         },
 768         {
 769                 .flags = DEV_RATE_OFDM,
 770                 .bitrate = 240,
 771                 .ratemask = BIT(8),
 772                 .plcp = 0x09,
 773                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 774         },
 775         {
 776                 .flags = DEV_RATE_OFDM,
 777                 .bitrate = 360,
 778                 .ratemask = BIT(9),
 779                 .plcp = 0x0d,
 780                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 781         },
 782         {
 783                 .flags = DEV_RATE_OFDM,
 784                 .bitrate = 480,
 785                 .ratemask = BIT(10),
 786                 .plcp = 0x08,
 787                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 788         },
 789         {
 790                 .flags = DEV_RATE_OFDM,
 791                 .bitrate = 540,
 792                 .ratemask = BIT(11),
 793                 .plcp = 0x0c,
 794                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 795         },
 796 };
 797
 798 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 799                               const int channel, const int tx_power,
 800                               const int value)
 801 {
 802         /* XXX: this assumption about the band is wrong for 802.11j */
 803         entry->band = channel <= 14 ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 804         entry->center_freq = ieee80211_channel_to_frequency(channel,
 805                                                             entry->band);
 806         entry->hw_value = value;
 807         entry->max_power = tx_power;
 808         entry->max_antenna_gain = 0xff;
 809 }
 810
 811 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 812                            const u16 index, const struct rt2x00_rate *rate)
 813 {
 814         entry->flags = 0;
 815         entry->bitrate = rate->bitrate;
 816         entry->hw_value = index;
 817         entry->hw_value_short = index;
 818
 819         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 820                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 821 }
 822
 823 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 824                                     struct hw_mode_spec *spec)
 825 {
 826         struct ieee80211_hw *hw = rt2x00dev->hw;
 827         struct ieee80211_channel *channels;
 828         struct ieee80211_rate *rates;
 829         unsigned int num_rates;
 830         unsigned int i;
 831
 832         num_rates = 0;
 833         if (spec->supported_rates & SUPPORT_RATE_CCK)
 834                 num_rates += 4;
 835         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 836                 num_rates += 8;
 837
 838         channels = kcalloc(spec->num_channels, sizeof(*channels), GFP_KERNEL);
 839         if (!channels)
 840                 return -ENOMEM;
 841
 842         rates = kcalloc(num_rates, sizeof(*rates), GFP_KERNEL);
 843         if (!rates)
 844                 goto exit_free_channels;
 845
 846         /*
 847          * Initialize Rate list.
 848          */
 849         for (i = 0; i < num_rates; i++)
 850                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 851
 852         /*
 853          * Initialize Channel list.
 854          */
 855         for (i = 0; i < spec->num_channels; i++) {
 856                 rt2x00lib_channel(&channels[i],
 857                                   spec->channels[i].channel,
 858                                   spec->channels_info[i].max_power, i);
 859         }
 860
 861         /*
 862          * Intitialize 802.11b, 802.11g
 863          * Rates: CCK, OFDM.
 864          * Channels: 2.4 GHz
 865          */
 866         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 867                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 868                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 869                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 870                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 871                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 872                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 873                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
 874                        &spec->ht, sizeof(spec->ht));
 875         }
 876
 877         /*
 878          * Intitialize 802.11a
 879          * Rates: OFDM.
 880          * Channels: OFDM, UNII, HiperLAN2.
 881          */
 882         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 883                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 884                     spec->num_channels - 14;
 885                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 886                     num_rates - 4;
 887                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 888                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 889                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 890                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 891                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
 892                        &spec->ht, sizeof(spec->ht));
 893         }
 894
 895         return 0;
 896
 897  exit_free_channels:
 898         kfree(channels);
 899         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 900         return -ENOMEM;
 901 }
 902
 903 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 904 {
 905         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 906                 ieee80211_unregister_hw(rt2x00dev->hw);
 907
 908         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 909                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 910                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 911                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 912                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 913         }
 914
 915         kfree(rt2x00dev->spec.channels_info);
 916 }
 917
 918 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 919 {
 920         struct hw_mode_spec *spec = &rt2x00dev->spec;
 921         int status;
 922
 923         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 924                 return 0;
 925
 926         /*
 927          * Initialize HW modes.
 928          */
 929         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 930         if (status)
 931                 return status;
 932
 933         /*
 934          * Initialize HW fields.
 935          */
 936         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 937
 938         /*
 939          * Initialize extra TX headroom required.
 940          */
 941         rt2x00dev->hw->extra_tx_headroom =
 942                 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
 943                       rt2x00dev->ops->extra_tx_headroom);
 944
 945         /*
 946          * Take TX headroom required for alignment into account.
 947          */
 948         if (test_bit(REQUIRE_L2PAD, &rt2x00dev->cap_flags))
 949                 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
 950         else if (test_bit(REQUIRE_DMA, &rt2x00dev->cap_flags))
 951                 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
 952
 953         /*
 954          * Tell mac80211 about the size of our private STA structure.
 955          */
 956         rt2x00dev->hw->sta_data_size = sizeof(struct rt2x00_sta);
 957
 958         /*
 959          * Allocate tx status FIFO for driver use.
 960          */
 961         if (test_bit(REQUIRE_TXSTATUS_FIFO, &rt2x00dev->cap_flags)) {
 962                 /*
 963                  * Allocate the txstatus fifo. In the worst case the tx
 964                  * status fifo has to hold the tx status of all entries
 965                  * in all tx queues. Hence, calculate the kfifo size as
 966                  * tx_queues * entry_num and round up to the nearest
 967                  * power of 2.
 968                  */
 969                 int kfifo_size =
 970                         roundup_pow_of_two(rt2x00dev->ops->tx_queues *
 971                                            rt2x00dev->ops->tx->entry_num *
 972                                            sizeof(u32));
 973
 974                 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, kfifo_size,
 975                                      GFP_KERNEL);
 976                 if (status)
 977                         return status;
 978         }
 979
 980         /*
 981          * Initialize tasklets if used by the driver. Tasklets are
 982          * disabled until the interrupts are turned on. The driver
 983          * has to handle that.
 984          */
 985 #define RT2X00_TASKLET_INIT(taskletname) \
 986         if (rt2x00dev->ops->lib->taskletname) { \
 987                 tasklet_init(&rt2x00dev->taskletname, \
 988                              rt2x00dev->ops->lib->taskletname, \
 989                              (unsigned long)rt2x00dev); \
 990         }
 991
 992         RT2X00_TASKLET_INIT(txstatus_tasklet);
 993         RT2X00_TASKLET_INIT(pretbtt_tasklet);
 994         RT2X00_TASKLET_INIT(tbtt_tasklet);
 995         RT2X00_TASKLET_INIT(rxdone_tasklet);
 996         RT2X00_TASKLET_INIT(autowake_tasklet);
 997
 998 #undef RT2X00_TASKLET_INIT
 999
1000         /*
1001          * Register HW.
1002          */
1003         status = ieee80211_register_hw(rt2x00dev->hw);
1004         if (status)
1005                 return status;
1006
1007         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
1008
1009         return 0;
1010 }
1011
1012 /*
1013  * Initialization/uninitialization handlers.
1014  */
1015 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
1016 {
1017         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1018                 return;
1019
1020         /*
1021          * Unregister extra components.
1022          */
1023         rt2x00rfkill_unregister(rt2x00dev);
1024
1025         /*
1026          * Allow the HW to uninitialize.
1027          */
1028         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1029
1030         /*
1031          * Free allocated queue entries.
1032          */
1033         rt2x00queue_uninitialize(rt2x00dev);
1034 }
1035
1036 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1037 {
1038         int status;
1039
1040         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1041                 return 0;
1042
1043         /*
1044          * Allocate all queue entries.
1045          */
1046         status = rt2x00queue_initialize(rt2x00dev);
1047         if (status)
1048                 return status;
1049
1050         /*
1051          * Initialize the device.
1052          */
1053         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1054         if (status) {
1055                 rt2x00queue_uninitialize(rt2x00dev);
1056                 return status;
1057         }
1058
1059         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
1060
1061         /*
1062          * Register the extra components.
1063          */
1064         rt2x00rfkill_register(rt2x00dev);
1065
1066         return 0;
1067 }
1068
1069 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1070 {
1071         int retval;
1072
1073         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1074                 return 0;
1075
1076         /*
1077          * If this is the first interface which is added,
1078          * we should load the firmware now.
1079          */
1080         retval = rt2x00lib_load_firmware(rt2x00dev);
1081         if (retval)
1082                 return retval;
1083
1084         /*
1085          * Initialize the device.
1086          */
1087         retval = rt2x00lib_initialize(rt2x00dev);
1088         if (retval)
1089                 return retval;
1090
1091         rt2x00dev->intf_ap_count = 0;
1092         rt2x00dev->intf_sta_count = 0;
1093         rt2x00dev->intf_associated = 0;
1094
1095         /* Enable the radio */
1096         retval = rt2x00lib_enable_radio(rt2x00dev);
1097         if (retval)
1098                 return retval;
1099
1100         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
1101
1102         return 0;
1103 }
1104
1105 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1106 {
1107         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1108                 return;
1109
1110         /*
1111          * Perhaps we can add something smarter here,
1112          * but for now just disabling the radio should do.
1113          */
1114         rt2x00lib_disable_radio(rt2x00dev);
1115
1116         rt2x00dev->intf_ap_count = 0;
1117         rt2x00dev->intf_sta_count = 0;
1118         rt2x00dev->intf_associated = 0;
1119 }
1120
1121 /*
1122  * driver allocation handlers.
1123  */
1124 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1125 {
1126         int retval = -ENOMEM;
1127
1128         spin_lock_init(&rt2x00dev->irqmask_lock);
1129         mutex_init(&rt2x00dev->csr_mutex);
1130
1131         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1132
1133         /*
1134          * Make room for rt2x00_intf inside the per-interface
1135          * structure ieee80211_vif.
1136          */
1137         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1138
1139         /*
1140          * Determine which operating modes are supported, all modes
1141          * which require beaconing, depend on the availability of
1142          * beacon entries.
1143          */
1144         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
1145         if (rt2x00dev->ops->bcn->entry_num > 0)
1146                 rt2x00dev->hw->wiphy->interface_modes |=
1147                     BIT(NL80211_IFTYPE_ADHOC) |
1148                     BIT(NL80211_IFTYPE_AP) |
1149                     BIT(NL80211_IFTYPE_MESH_POINT) |
1150                     BIT(NL80211_IFTYPE_WDS);
1151
1152         /*
1153          * Initialize work.
1154          */
1155         rt2x00dev->workqueue =
1156             alloc_ordered_workqueue(wiphy_name(rt2x00dev->hw->wiphy), 0);
1157         if (!rt2x00dev->workqueue) {
1158                 retval = -ENOMEM;
1159                 goto exit;
1160         }
1161
1162         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1163         INIT_DELAYED_WORK(&rt2x00dev->autowakeup_work, rt2x00lib_autowakeup);
1164         INIT_WORK(&rt2x00dev->sleep_work, rt2x00lib_sleep);
1165
1166         /*
1167          * Let the driver probe the device to detect the capabilities.
1168          */
1169         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1170         if (retval) {
1171                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1172                 goto exit;
1173         }
1174
1175         /*
1176          * Allocate queue array.
1177          */
1178         retval = rt2x00queue_allocate(rt2x00dev);
1179         if (retval)
1180                 goto exit;
1181
1182         /*
1183          * Initialize ieee80211 structure.
1184          */
1185         retval = rt2x00lib_probe_hw(rt2x00dev);
1186         if (retval) {
1187                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1188                 goto exit;
1189         }
1190
1191         /*
1192          * Register extra components.
1193          */
1194         rt2x00link_register(rt2x00dev);
1195         rt2x00leds_register(rt2x00dev);
1196         rt2x00debug_register(rt2x00dev);
1197
1198         return 0;
1199
1200 exit:
1201         rt2x00lib_remove_dev(rt2x00dev);
1202
1203         return retval;
1204 }
1205 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1206
1207 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1208 {
1209         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1210
1211         /*
1212          * Disable radio.
1213          */
1214         rt2x00lib_disable_radio(rt2x00dev);
1215
1216         /*
1217          * Stop all work.
1218          */
1219         cancel_work_sync(&rt2x00dev->intf_work);
1220         cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
1221         cancel_work_sync(&rt2x00dev->sleep_work);
1222         if (rt2x00_is_usb(rt2x00dev)) {
1223                 del_timer_sync(&rt2x00dev->txstatus_timer);
1224                 cancel_work_sync(&rt2x00dev->rxdone_work);
1225                 cancel_work_sync(&rt2x00dev->txdone_work);
1226         }
1227         if (rt2x00dev->workqueue)
1228                 destroy_workqueue(rt2x00dev->workqueue);
1229
1230         /*
1231          * Free the tx status fifo.
1232          */
1233         kfifo_free(&rt2x00dev->txstatus_fifo);
1234
1235         /*
1236          * Kill the tx status tasklet.
1237          */
1238         tasklet_kill(&rt2x00dev->txstatus_tasklet);
1239         tasklet_kill(&rt2x00dev->pretbtt_tasklet);
1240         tasklet_kill(&rt2x00dev->tbtt_tasklet);
1241         tasklet_kill(&rt2x00dev->rxdone_tasklet);
1242         tasklet_kill(&rt2x00dev->autowake_tasklet);
1243
1244         /*
1245          * Uninitialize device.
1246          */
1247         rt2x00lib_uninitialize(rt2x00dev);
1248
1249         /*
1250          * Free extra components
1251          */
1252         rt2x00debug_deregister(rt2x00dev);
1253         rt2x00leds_unregister(rt2x00dev);
1254
1255         /*
1256          * Free ieee80211_hw memory.
1257          */
1258         rt2x00lib_remove_hw(rt2x00dev);
1259
1260         /*
1261          * Free firmware image.
1262          */
1263         rt2x00lib_free_firmware(rt2x00dev);
1264
1265         /*
1266          * Free queue structures.
1267          */
1268         rt2x00queue_free(rt2x00dev);
1269 }
1270 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1271
1272 /*
1273  * Device state handlers
1274  */
1275 #ifdef CONFIG_PM
1276 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1277 {
1278         NOTICE(rt2x00dev, "Going to sleep.\n");
1279
1280         /*
1281          * Prevent mac80211 from accessing driver while suspended.
1282          */
1283         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1284                 return 0;
1285
1286         /*
1287          * Cleanup as much as possible.
1288          */
1289         rt2x00lib_uninitialize(rt2x00dev);
1290
1291         /*
1292          * Suspend/disable extra components.
1293          */
1294         rt2x00leds_suspend(rt2x00dev);
1295         rt2x00debug_deregister(rt2x00dev);
1296
1297         /*
1298          * Set device mode to sleep for power management,
1299          * on some hardware this call seems to consistently fail.
1300          * From the specifications it is hard to tell why it fails,
1301          * and if this is a "bad thing".
1302          * Overall it is safe to just ignore the failure and
1303          * continue suspending. The only downside is that the
1304          * device will not be in optimal power save mode, but with
1305          * the radio and the other components already disabled the
1306          * device is as good as disabled.
1307          */
1308         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1309                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1310                         "continue suspending.\n");
1311
1312         return 0;
1313 }
1314 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1315
1316 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1317 {
1318         NOTICE(rt2x00dev, "Waking up.\n");
1319
1320         /*
1321          * Restore/enable extra components.
1322          */
1323         rt2x00debug_register(rt2x00dev);
1324         rt2x00leds_resume(rt2x00dev);
1325
1326         /*
1327          * We are ready again to receive requests from mac80211.
1328          */
1329         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1330
1331         return 0;
1332 }
1333 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1334 #endif /* CONFIG_PM */
1335
1336 /*
1337  * rt2x00lib module information.
1338  */
1339 MODULE_AUTHOR(DRV_PROJECT);
1340 MODULE_VERSION(DRV_VERSION);
1341 MODULE_DESCRIPTION("rt2x00 library");
1342 MODULE_LICENSE("GPL");