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