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.
 430          */
 431         if (!rt2x00queue_threshold(entry->queue))
 432                 rt2x00queue_unpause_queue(entry->queue);
 433 }
 434 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 435
 436 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
 437 {
 438         struct txdone_entry_desc txdesc;
 439
 440         txdesc.flags = 0;
 441         __set_bit(status, &txdesc.flags);
 442         txdesc.retry = 0;
 443
 444         rt2x00lib_txdone(entry, &txdesc);
 445 }
 446 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
 447
 448 static u8 *rt2x00lib_find_ie(u8 *data, unsigned int len, u8 ie)
 449 {
 450         struct ieee80211_mgmt *mgmt = (void *)data;
 451         u8 *pos, *end;
 452
 453         pos = (u8 *)mgmt->u.beacon.variable;
 454         end = data + len;
 455         while (pos < end) {
 456                 if (pos + 2 + pos[1] > end)
 457                         return NULL;
 458
 459                 if (pos[0] == ie)
 460                         return pos;
 461
 462                 pos += 2 + pos[1];
 463         }
 464
 465         return NULL;
 466 }
 467
 468 static void rt2x00lib_sleep(struct work_struct *work)
 469 {
 470         struct rt2x00_dev *rt2x00dev =
 471             container_of(work, struct rt2x00_dev, sleep_work);
 472
 473         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 474                 return;
 475
 476         /*
 477          * Check again is powersaving is enabled, to prevent races from delayed
 478          * work execution.
 479          */
 480         if (!test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 481                 rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf,
 482                                  IEEE80211_CONF_CHANGE_PS);
 483 }
 484
 485 static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev,
 486                                       struct sk_buff *skb,
 487                                       struct rxdone_entry_desc *rxdesc)
 488 {
 489         struct ieee80211_hdr *hdr = (void *) skb->data;
 490         struct ieee80211_tim_ie *tim_ie;
 491         u8 *tim;
 492         u8 tim_len;
 493         bool cam;
 494
 495         /* If this is not a beacon, or if mac80211 has no powersaving
 496          * configured, or if the device is already in powersaving mode
 497          * we can exit now. */
 498         if (likely(!ieee80211_is_beacon(hdr->frame_control) ||
 499                    !(rt2x00dev->hw->conf.flags & IEEE80211_CONF_PS)))
 500                 return;
 501
 502         /* min. beacon length + FCS_LEN */
 503         if (skb->len <= 40 + FCS_LEN)
 504                 return;
 505
 506         /* and only beacons from the associated BSSID, please */
 507         if (!(rxdesc->dev_flags & RXDONE_MY_BSS) ||
 508             !rt2x00dev->aid)
 509                 return;
 510
 511         rt2x00dev->last_beacon = jiffies;
 512
 513         tim = rt2x00lib_find_ie(skb->data, skb->len - FCS_LEN, WLAN_EID_TIM);
 514         if (!tim)
 515                 return;
 516
 517         if (tim[1] < sizeof(*tim_ie))
 518                 return;
 519
 520         tim_len = tim[1];
 521         tim_ie = (struct ieee80211_tim_ie *) &tim[2];
 522
 523         /* Check whenever the PHY can be turned off again. */
 524
 525         /* 1. What about buffered unicast traffic for our AID? */
 526         cam = ieee80211_check_tim(tim_ie, tim_len, rt2x00dev->aid);
 527
 528         /* 2. Maybe the AP wants to send multicast/broadcast data? */
 529         cam |= (tim_ie->bitmap_ctrl & 0x01);
 530
 531         if (!cam && !test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 532                 queue_work(rt2x00dev->workqueue, &rt2x00dev->sleep_work);
 533 }
 534
 535 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 536                                         struct rxdone_entry_desc *rxdesc)
 537 {
 538         struct ieee80211_supported_band *sband;
 539         const struct rt2x00_rate *rate;
 540         unsigned int i;
 541         int signal = rxdesc->signal;
 542         int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 543
 544         switch (rxdesc->rate_mode) {
 545         case RATE_MODE_CCK:
 546         case RATE_MODE_OFDM:
 547                 /*
 548                  * For non-HT rates the MCS value needs to contain the
 549                  * actually used rate modulation (CCK or OFDM).
 550                  */
 551                 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 552                         signal = RATE_MCS(rxdesc->rate_mode, signal);
 553
 554                 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 555                 for (i = 0; i < sband->n_bitrates; i++) {
 556                         rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 557                         if (((type == RXDONE_SIGNAL_PLCP) &&
 558                              (rate->plcp == signal)) ||
 559                             ((type == RXDONE_SIGNAL_BITRATE) &&
 560                               (rate->bitrate == signal)) ||
 561                             ((type == RXDONE_SIGNAL_MCS) &&
 562                               (rate->mcs == signal))) {
 563                                 return i;
 564                         }
 565                 }
 566                 break;
 567         case RATE_MODE_HT_MIX:
 568         case RATE_MODE_HT_GREENFIELD:
 569                 if (signal >= 0 && signal <= 76)
 570                         return signal;
 571                 break;
 572         default:
 573                 break;
 574         }
 575
 576         WARNING(rt2x00dev, "Frame received with unrecognized signal, "
 577                 "mode=0x%.4x, signal=0x%.4x, type=%d.\n",
 578                 rxdesc->rate_mode, signal, type);
 579         return 0;
 580 }
 581
 582 void rt2x00lib_rxdone(struct queue_entry *entry)
 583 {
 584         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 585         struct rxdone_entry_desc rxdesc;
 586         struct sk_buff *skb;
 587         struct ieee80211_rx_status *rx_status;
 588         unsigned int header_length;
 589         int rate_idx;
 590
 591         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 592             !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 593                 goto submit_entry;
 594
 595         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 596                 goto submit_entry;
 597
 598         /*
 599          * Allocate a new sk_buffer. If no new buffer available, drop the
 600          * received frame and reuse the existing buffer.
 601          */
 602         skb = rt2x00queue_alloc_rxskb(entry);
 603         if (!skb)
 604                 goto submit_entry;
 605
 606         /*
 607          * Unmap the skb.
 608          */
 609         rt2x00queue_unmap_skb(entry);
 610
 611         /*
 612          * Extract the RXD details.
 613          */
 614         memset(&rxdesc, 0, sizeof(rxdesc));
 615         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 616
 617         /*
 618          * Check for valid size in case we get corrupted descriptor from
 619          * hardware.
 620          */
 621         if (unlikely(rxdesc.size == 0 ||
 622                      rxdesc.size > entry->queue->data_size)) {
 623                 WARNING(rt2x00dev, "Wrong frame size %d max %d.\n",
 624                         rxdesc.size, entry->queue->data_size);
 625                 dev_kfree_skb(entry->skb);
 626                 goto renew_skb;
 627         }
 628
 629         /*
 630          * The data behind the ieee80211 header must be
 631          * aligned on a 4 byte boundary.
 632          */
 633         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 634
 635         /*
 636          * Hardware might have stripped the IV/EIV/ICV data,
 637          * in that case it is possible that the data was
 638          * provided separately (through hardware descriptor)
 639          * in which case we should reinsert the data into the frame.
 640          */
 641         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 642             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 643                 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
 644                                           &rxdesc);
 645         else if (header_length &&
 646                  (rxdesc.size > header_length) &&
 647                  (rxdesc.dev_flags & RXDONE_L2PAD))
 648                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 649
 650         /* Trim buffer to correct size */
 651         skb_trim(entry->skb, rxdesc.size);
 652
 653         /*
 654          * Translate the signal to the correct bitrate index.
 655          */
 656         rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 657         if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
 658             rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
 659                 rxdesc.flags |= RX_FLAG_HT;
 660
 661         /*
 662          * Check if this is a beacon, and more frames have been
 663          * buffered while we were in powersaving mode.
 664          */
 665         rt2x00lib_rxdone_check_ps(rt2x00dev, entry->skb, &rxdesc);
 666
 667         /*
 668          * Update extra components
 669          */
 670         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 671         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 672         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 673
 674         /*
 675          * Initialize RX status information, and send frame
 676          * to mac80211.
 677          */
 678         rx_status = IEEE80211_SKB_RXCB(entry->skb);
 679         rx_status->mactime = rxdesc.timestamp;
 680         rx_status->band = rt2x00dev->curr_band;
 681         rx_status->freq = rt2x00dev->curr_freq;
 682         rx_status->rate_idx = rate_idx;
 683         rx_status->signal = rxdesc.rssi;
 684         rx_status->flag = rxdesc.flags;
 685         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 686
 687         ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
 688
 689 renew_skb:
 690         /*
 691          * Replace the skb with the freshly allocated one.
 692          */
 693         entry->skb = skb;
 694
 695 submit_entry:
 696         entry->flags = 0;
 697         rt2x00queue_index_inc(entry, Q_INDEX_DONE);
 698         if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
 699             test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 700                 rt2x00dev->ops->lib->clear_entry(entry);
 701 }
 702 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 703
 704 /*
 705  * Driver initialization handlers.
 706  */
 707 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 708         {
 709                 .flags = DEV_RATE_CCK,
 710                 .bitrate = 10,
 711                 .ratemask = BIT(0),
 712                 .plcp = 0x00,
 713                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 714         },
 715         {
 716                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 717                 .bitrate = 20,
 718                 .ratemask = BIT(1),
 719                 .plcp = 0x01,
 720                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 721         },
 722         {
 723                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 724                 .bitrate = 55,
 725                 .ratemask = BIT(2),
 726                 .plcp = 0x02,
 727                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 728         },
 729         {
 730                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 731                 .bitrate = 110,
 732                 .ratemask = BIT(3),
 733                 .plcp = 0x03,
 734                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 735         },
 736         {
 737                 .flags = DEV_RATE_OFDM,
 738                 .bitrate = 60,
 739                 .ratemask = BIT(4),
 740                 .plcp = 0x0b,
 741                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 742         },
 743         {
 744                 .flags = DEV_RATE_OFDM,
 745                 .bitrate = 90,
 746                 .ratemask = BIT(5),
 747                 .plcp = 0x0f,
 748                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 749         },
 750         {
 751                 .flags = DEV_RATE_OFDM,
 752                 .bitrate = 120,
 753                 .ratemask = BIT(6),
 754                 .plcp = 0x0a,
 755                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 756         },
 757         {
 758                 .flags = DEV_RATE_OFDM,
 759                 .bitrate = 180,
 760                 .ratemask = BIT(7),
 761                 .plcp = 0x0e,
 762                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 763         },
 764         {
 765                 .flags = DEV_RATE_OFDM,
 766                 .bitrate = 240,
 767                 .ratemask = BIT(8),
 768                 .plcp = 0x09,
 769                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 770         },
 771         {
 772                 .flags = DEV_RATE_OFDM,
 773                 .bitrate = 360,
 774                 .ratemask = BIT(9),
 775                 .plcp = 0x0d,
 776                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 777         },
 778         {
 779                 .flags = DEV_RATE_OFDM,
 780                 .bitrate = 480,
 781                 .ratemask = BIT(10),
 782                 .plcp = 0x08,
 783                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 784         },
 785         {
 786                 .flags = DEV_RATE_OFDM,
 787                 .bitrate = 540,
 788                 .ratemask = BIT(11),
 789                 .plcp = 0x0c,
 790                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 791         },
 792 };
 793
 794 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 795                               const int channel, const int tx_power,
 796                               const int value)
 797 {
 798         /* XXX: this assumption about the band is wrong for 802.11j */
 799         entry->band = channel <= 14 ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 800         entry->center_freq = ieee80211_channel_to_frequency(channel,
 801                                                             entry->band);
 802         entry->hw_value = value;
 803         entry->max_power = tx_power;
 804         entry->max_antenna_gain = 0xff;
 805 }
 806
 807 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 808                            const u16 index, const struct rt2x00_rate *rate)
 809 {
 810         entry->flags = 0;
 811         entry->bitrate = rate->bitrate;
 812         entry->hw_value = index;
 813         entry->hw_value_short = index;
 814
 815         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 816                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 817 }
 818
 819 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 820                                     struct hw_mode_spec *spec)
 821 {
 822         struct ieee80211_hw *hw = rt2x00dev->hw;
 823         struct ieee80211_channel *channels;
 824         struct ieee80211_rate *rates;
 825         unsigned int num_rates;
 826         unsigned int i;
 827
 828         num_rates = 0;
 829         if (spec->supported_rates & SUPPORT_RATE_CCK)
 830                 num_rates += 4;
 831         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 832                 num_rates += 8;
 833
 834         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 835         if (!channels)
 836                 return -ENOMEM;
 837
 838         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 839         if (!rates)
 840                 goto exit_free_channels;
 841
 842         /*
 843          * Initialize Rate list.
 844          */
 845         for (i = 0; i < num_rates; i++)
 846                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 847
 848         /*
 849          * Initialize Channel list.
 850          */
 851         for (i = 0; i < spec->num_channels; i++) {
 852                 rt2x00lib_channel(&channels[i],
 853                                   spec->channels[i].channel,
 854                                   spec->channels_info[i].max_power, i);
 855         }
 856
 857         /*
 858          * Intitialize 802.11b, 802.11g
 859          * Rates: CCK, OFDM.
 860          * Channels: 2.4 GHz
 861          */
 862         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 863                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 864                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 865                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 866                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 867                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 868                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 869                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
 870                        &spec->ht, sizeof(spec->ht));
 871         }
 872
 873         /*
 874          * Intitialize 802.11a
 875          * Rates: OFDM.
 876          * Channels: OFDM, UNII, HiperLAN2.
 877          */
 878         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 879                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 880                     spec->num_channels - 14;
 881                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 882                     num_rates - 4;
 883                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 884                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 885                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 886                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 887                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
 888                        &spec->ht, sizeof(spec->ht));
 889         }
 890
 891         return 0;
 892
 893  exit_free_channels:
 894         kfree(channels);
 895         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 896         return -ENOMEM;
 897 }
 898
 899 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 900 {
 901         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 902                 ieee80211_unregister_hw(rt2x00dev->hw);
 903
 904         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 905                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 906                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 907                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 908                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 909         }
 910
 911         kfree(rt2x00dev->spec.channels_info);
 912 }
 913
 914 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 915 {
 916         struct hw_mode_spec *spec = &rt2x00dev->spec;
 917         int status;
 918
 919         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 920                 return 0;
 921
 922         /*
 923          * Initialize HW modes.
 924          */
 925         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 926         if (status)
 927                 return status;
 928
 929         /*
 930          * Initialize HW fields.
 931          */
 932         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 933
 934         /*
 935          * Initialize extra TX headroom required.
 936          */
 937         rt2x00dev->hw->extra_tx_headroom =
 938                 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
 939                       rt2x00dev->ops->extra_tx_headroom);
 940
 941         /*
 942          * Take TX headroom required for alignment into account.
 943          */
 944         if (test_bit(REQUIRE_L2PAD, &rt2x00dev->cap_flags))
 945                 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
 946         else if (test_bit(REQUIRE_DMA, &rt2x00dev->cap_flags))
 947                 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
 948
 949         /*
 950          * Tell mac80211 about the size of our private STA structure.
 951          */
 952         rt2x00dev->hw->sta_data_size = sizeof(struct rt2x00_sta);
 953
 954         /*
 955          * Allocate tx status FIFO for driver use.
 956          */
 957         if (test_bit(REQUIRE_TXSTATUS_FIFO, &rt2x00dev->cap_flags)) {
 958                 /*
 959                  * Allocate the txstatus fifo. In the worst case the tx
 960                  * status fifo has to hold the tx status of all entries
 961                  * in all tx queues. Hence, calculate the kfifo size as
 962                  * tx_queues * entry_num and round up to the nearest
 963                  * power of 2.
 964                  */
 965                 int kfifo_size =
 966                         roundup_pow_of_two(rt2x00dev->ops->tx_queues *
 967                                            rt2x00dev->ops->tx->entry_num *
 968                                            sizeof(u32));
 969
 970                 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, kfifo_size,
 971                                      GFP_KERNEL);
 972                 if (status)
 973                         return status;
 974         }
 975
 976         /*
 977          * Initialize tasklets if used by the driver. Tasklets are
 978          * disabled until the interrupts are turned on. The driver
 979          * has to handle that.
 980          */
 981 #define RT2X00_TASKLET_INIT(taskletname) \
 982         if (rt2x00dev->ops->lib->taskletname) { \
 983                 tasklet_init(&rt2x00dev->taskletname, \
 984                              rt2x00dev->ops->lib->taskletname, \
 985                              (unsigned long)rt2x00dev); \
 986         }
 987
 988         RT2X00_TASKLET_INIT(txstatus_tasklet);
 989         RT2X00_TASKLET_INIT(pretbtt_tasklet);
 990         RT2X00_TASKLET_INIT(tbtt_tasklet);
 991         RT2X00_TASKLET_INIT(rxdone_tasklet);
 992         RT2X00_TASKLET_INIT(autowake_tasklet);
 993
 994 #undef RT2X00_TASKLET_INIT
 995
 996         /*
 997          * Register HW.
 998          */
 999         status = ieee80211_register_hw(rt2x00dev->hw);
1000         if (status)
1001                 return status;
1002
1003         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
1004
1005         return 0;
1006 }
1007
1008 /*
1009  * Initialization/uninitialization handlers.
1010  */
1011 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
1012 {
1013         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1014                 return;
1015
1016         /*
1017          * Unregister extra components.
1018          */
1019         rt2x00rfkill_unregister(rt2x00dev);
1020
1021         /*
1022          * Allow the HW to uninitialize.
1023          */
1024         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1025
1026         /*
1027          * Free allocated queue entries.
1028          */
1029         rt2x00queue_uninitialize(rt2x00dev);
1030 }
1031
1032 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1033 {
1034         int status;
1035
1036         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1037                 return 0;
1038
1039         /*
1040          * Allocate all queue entries.
1041          */
1042         status = rt2x00queue_initialize(rt2x00dev);
1043         if (status)
1044                 return status;
1045
1046         /*
1047          * Initialize the device.
1048          */
1049         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1050         if (status) {
1051                 rt2x00queue_uninitialize(rt2x00dev);
1052                 return status;
1053         }
1054
1055         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
1056
1057         /*
1058          * Register the extra components.
1059          */
1060         rt2x00rfkill_register(rt2x00dev);
1061
1062         return 0;
1063 }
1064
1065 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1066 {
1067         int retval;
1068
1069         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1070                 return 0;
1071
1072         /*
1073          * If this is the first interface which is added,
1074          * we should load the firmware now.
1075          */
1076         retval = rt2x00lib_load_firmware(rt2x00dev);
1077         if (retval)
1078                 return retval;
1079
1080         /*
1081          * Initialize the device.
1082          */
1083         retval = rt2x00lib_initialize(rt2x00dev);
1084         if (retval)
1085                 return retval;
1086
1087         rt2x00dev->intf_ap_count = 0;
1088         rt2x00dev->intf_sta_count = 0;
1089         rt2x00dev->intf_associated = 0;
1090
1091         /* Enable the radio */
1092         retval = rt2x00lib_enable_radio(rt2x00dev);
1093         if (retval)
1094                 return retval;
1095
1096         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
1097
1098         return 0;
1099 }
1100
1101 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1102 {
1103         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1104                 return;
1105
1106         /*
1107          * Perhaps we can add something smarter here,
1108          * but for now just disabling the radio should do.
1109          */
1110         rt2x00lib_disable_radio(rt2x00dev);
1111
1112         rt2x00dev->intf_ap_count = 0;
1113         rt2x00dev->intf_sta_count = 0;
1114         rt2x00dev->intf_associated = 0;
1115 }
1116
1117 /*
1118  * driver allocation handlers.
1119  */
1120 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1121 {
1122         int retval = -ENOMEM;
1123
1124         spin_lock_init(&rt2x00dev->irqmask_lock);
1125         mutex_init(&rt2x00dev->csr_mutex);
1126
1127         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1128
1129         /*
1130          * Make room for rt2x00_intf inside the per-interface
1131          * structure ieee80211_vif.
1132          */
1133         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1134
1135         /*
1136          * Determine which operating modes are supported, all modes
1137          * which require beaconing, depend on the availability of
1138          * beacon entries.
1139          */
1140         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
1141         if (rt2x00dev->ops->bcn->entry_num > 0)
1142                 rt2x00dev->hw->wiphy->interface_modes |=
1143                     BIT(NL80211_IFTYPE_ADHOC) |
1144                     BIT(NL80211_IFTYPE_AP) |
1145                     BIT(NL80211_IFTYPE_MESH_POINT) |
1146                     BIT(NL80211_IFTYPE_WDS);
1147
1148         /*
1149          * Initialize work.
1150          */
1151         rt2x00dev->workqueue =
1152             alloc_ordered_workqueue(wiphy_name(rt2x00dev->hw->wiphy), 0);
1153         if (!rt2x00dev->workqueue) {
1154                 retval = -ENOMEM;
1155                 goto exit;
1156         }
1157
1158         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1159         INIT_DELAYED_WORK(&rt2x00dev->autowakeup_work, rt2x00lib_autowakeup);
1160         INIT_WORK(&rt2x00dev->sleep_work, rt2x00lib_sleep);
1161
1162         /*
1163          * Let the driver probe the device to detect the capabilities.
1164          */
1165         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1166         if (retval) {
1167                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1168                 goto exit;
1169         }
1170
1171         /*
1172          * Allocate queue array.
1173          */
1174         retval = rt2x00queue_allocate(rt2x00dev);
1175         if (retval)
1176                 goto exit;
1177
1178         /*
1179          * Initialize ieee80211 structure.
1180          */
1181         retval = rt2x00lib_probe_hw(rt2x00dev);
1182         if (retval) {
1183                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1184                 goto exit;
1185         }
1186
1187         /*
1188          * Register extra components.
1189          */
1190         rt2x00link_register(rt2x00dev);
1191         rt2x00leds_register(rt2x00dev);
1192         rt2x00debug_register(rt2x00dev);
1193
1194         return 0;
1195
1196 exit:
1197         rt2x00lib_remove_dev(rt2x00dev);
1198
1199         return retval;
1200 }
1201 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1202
1203 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1204 {
1205         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1206
1207         /*
1208          * Disable radio.
1209          */
1210         rt2x00lib_disable_radio(rt2x00dev);
1211
1212         /*
1213          * Stop all work.
1214          */
1215         cancel_work_sync(&rt2x00dev->intf_work);
1216         cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
1217         cancel_work_sync(&rt2x00dev->sleep_work);
1218         if (rt2x00_is_usb(rt2x00dev)) {
1219                 del_timer_sync(&rt2x00dev->txstatus_timer);
1220                 cancel_work_sync(&rt2x00dev->rxdone_work);
1221                 cancel_work_sync(&rt2x00dev->txdone_work);
1222         }
1223         destroy_workqueue(rt2x00dev->workqueue);
1224
1225         /*
1226          * Free the tx status fifo.
1227          */
1228         kfifo_free(&rt2x00dev->txstatus_fifo);
1229
1230         /*
1231          * Kill the tx status tasklet.
1232          */
1233         tasklet_kill(&rt2x00dev->txstatus_tasklet);
1234         tasklet_kill(&rt2x00dev->pretbtt_tasklet);
1235         tasklet_kill(&rt2x00dev->tbtt_tasklet);
1236         tasklet_kill(&rt2x00dev->rxdone_tasklet);
1237         tasklet_kill(&rt2x00dev->autowake_tasklet);
1238
1239         /*
1240          * Uninitialize device.
1241          */
1242         rt2x00lib_uninitialize(rt2x00dev);
1243
1244         /*
1245          * Free extra components
1246          */
1247         rt2x00debug_deregister(rt2x00dev);
1248         rt2x00leds_unregister(rt2x00dev);
1249
1250         /*
1251          * Free ieee80211_hw memory.
1252          */
1253         rt2x00lib_remove_hw(rt2x00dev);
1254
1255         /*
1256          * Free firmware image.
1257          */
1258         rt2x00lib_free_firmware(rt2x00dev);
1259
1260         /*
1261          * Free queue structures.
1262          */
1263         rt2x00queue_free(rt2x00dev);
1264 }
1265 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1266
1267 /*
1268  * Device state handlers
1269  */
1270 #ifdef CONFIG_PM
1271 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1272 {
1273         NOTICE(rt2x00dev, "Going to sleep.\n");
1274
1275         /*
1276          * Prevent mac80211 from accessing driver while suspended.
1277          */
1278         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1279                 return 0;
1280
1281         /*
1282          * Cleanup as much as possible.
1283          */
1284         rt2x00lib_uninitialize(rt2x00dev);
1285
1286         /*
1287          * Suspend/disable extra components.
1288          */
1289         rt2x00leds_suspend(rt2x00dev);
1290         rt2x00debug_deregister(rt2x00dev);
1291
1292         /*
1293          * Set device mode to sleep for power management,
1294          * on some hardware this call seems to consistently fail.
1295          * From the specifications it is hard to tell why it fails,
1296          * and if this is a "bad thing".
1297          * Overall it is safe to just ignore the failure and
1298          * continue suspending. The only downside is that the
1299          * device will not be in optimal power save mode, but with
1300          * the radio and the other components already disabled the
1301          * device is as good as disabled.
1302          */
1303         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1304                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1305                         "continue suspending.\n");
1306
1307         return 0;
1308 }
1309 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1310
1311 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1312 {
1313         NOTICE(rt2x00dev, "Waking up.\n");
1314
1315         /*
1316          * Restore/enable extra components.
1317          */
1318         rt2x00debug_register(rt2x00dev);
1319         rt2x00leds_resume(rt2x00dev);
1320
1321         /*
1322          * We are ready again to receive requests from mac80211.
1323          */
1324         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1325
1326         return 0;
1327 }
1328 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1329 #endif /* CONFIG_PM */
1330
1331 /*
1332  * rt2x00lib module information.
1333  */
1334 MODULE_AUTHOR(DRV_PROJECT);
1335 MODULE_VERSION(DRV_VERSION);
1336 MODULE_DESCRIPTION("rt2x00 library");
1337 MODULE_LICENSE("GPL");