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         if (test_bit(CAPABILITY_VCO_RECALIBRATION, &rt2x00dev->cap_flags))
  92                 rt2x00link_start_vcocal(rt2x00dev);
  93
  94         /*
  95          * Start watchdog monitoring.
  96          */
  97         rt2x00link_start_watchdog(rt2x00dev);
  98
  99         return 0;
 100 }
 101
 102 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
 103 {
 104         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 105                 return;
 106
 107         /*
 108          * Stop watchdog monitoring.
 109          */
 110         rt2x00link_stop_watchdog(rt2x00dev);
 111
 112         /*
 113          * Stop all queues
 114          */
 115         rt2x00link_stop_agc(rt2x00dev);
 116         if (test_bit(CAPABILITY_VCO_RECALIBRATION, &rt2x00dev->cap_flags))
 117                 rt2x00link_stop_vcocal(rt2x00dev);
 118         rt2x00link_stop_tuner(rt2x00dev);
 119         rt2x00queue_stop_queues(rt2x00dev);
 120         rt2x00queue_flush_queues(rt2x00dev, true);
 121
 122         /*
 123          * Disable radio.
 124          */
 125         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 126         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 127         rt2x00led_led_activity(rt2x00dev, false);
 128         rt2x00leds_led_radio(rt2x00dev, false);
 129 }
 130
 131 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 132                                           struct ieee80211_vif *vif)
 133 {
 134         struct rt2x00_dev *rt2x00dev = data;
 135         struct rt2x00_intf *intf = vif_to_intf(vif);
 136
 137         /*
 138          * It is possible the radio was disabled while the work had been
 139          * scheduled. If that happens we should return here immediately,
 140          * note that in the spinlock protected area above the delayed_flags
 141          * have been cleared correctly.
 142          */
 143         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 144                 return;
 145
 146         if (test_and_clear_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags))
 147                 rt2x00queue_update_beacon(rt2x00dev, vif);
 148 }
 149
 150 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 151 {
 152         struct rt2x00_dev *rt2x00dev =
 153             container_of(work, struct rt2x00_dev, intf_work);
 154
 155         /*
 156          * Iterate over each interface and perform the
 157          * requested configurations.
 158          */
 159         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 160                                             rt2x00lib_intf_scheduled_iter,
 161                                             rt2x00dev);
 162 }
 163
 164 static void rt2x00lib_autowakeup(struct work_struct *work)
 165 {
 166         struct rt2x00_dev *rt2x00dev =
 167             container_of(work, struct rt2x00_dev, autowakeup_work.work);
 168
 169         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 170                 return;
 171
 172         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_AWAKE))
 173                 ERROR(rt2x00dev, "Device failed to wakeup.\n");
 174         clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
 175 }
 176
 177 /*
 178  * Interrupt context handlers.
 179  */
 180 static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac,
 181                                      struct ieee80211_vif *vif)
 182 {
 183         struct rt2x00_dev *rt2x00dev = data;
 184         struct sk_buff *skb;
 185
 186         /*
 187          * Only AP mode interfaces do broad- and multicast buffering
 188          */
 189         if (vif->type != NL80211_IFTYPE_AP)
 190                 return;
 191
 192         /*
 193          * Send out buffered broad- and multicast frames
 194          */
 195         skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 196         while (skb) {
 197                 rt2x00mac_tx(rt2x00dev->hw, skb);
 198                 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 199         }
 200 }
 201
 202 static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac,
 203                                         struct ieee80211_vif *vif)
 204 {
 205         struct rt2x00_dev *rt2x00dev = data;
 206
 207         if (vif->type != NL80211_IFTYPE_AP &&
 208             vif->type != NL80211_IFTYPE_ADHOC &&
 209             vif->type != NL80211_IFTYPE_MESH_POINT &&
 210             vif->type != NL80211_IFTYPE_WDS)
 211                 return;
 212
 213         /*
 214          * Update the beacon without locking. This is safe on PCI devices
 215          * as they only update the beacon periodically here. This should
 216          * never be called for USB devices.
 217          */
 218         WARN_ON(rt2x00_is_usb(rt2x00dev));
 219         rt2x00queue_update_beacon_locked(rt2x00dev, vif);
 220 }
 221
 222 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 223 {
 224         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 225                 return;
 226
 227         /* send buffered bc/mc frames out for every bssid */
 228         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 229                                                    rt2x00lib_bc_buffer_iter,
 230                                                    rt2x00dev);
 231         /*
 232          * Devices with pre tbtt interrupt don't need to update the beacon
 233          * here as they will fetch the next beacon directly prior to
 234          * transmission.
 235          */
 236         if (test_bit(CAPABILITY_PRE_TBTT_INTERRUPT, &rt2x00dev->cap_flags))
 237                 return;
 238
 239         /* fetch next beacon */
 240         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 241                                                    rt2x00lib_beaconupdate_iter,
 242                                                    rt2x00dev);
 243 }
 244 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 245
 246 void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev)
 247 {
 248         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 249                 return;
 250
 251         /* fetch next beacon */
 252         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 253                                                    rt2x00lib_beaconupdate_iter,
 254                                                    rt2x00dev);
 255 }
 256 EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
 257
 258 void rt2x00lib_dmastart(struct queue_entry *entry)
 259 {
 260         set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 261         rt2x00queue_index_inc(entry, Q_INDEX);
 262 }
 263 EXPORT_SYMBOL_GPL(rt2x00lib_dmastart);
 264
 265 void rt2x00lib_dmadone(struct queue_entry *entry)
 266 {
 267         set_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags);
 268         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 269         rt2x00queue_index_inc(entry, Q_INDEX_DMA_DONE);
 270 }
 271 EXPORT_SYMBOL_GPL(rt2x00lib_dmadone);
 272
 273 void rt2x00lib_txdone(struct queue_entry *entry,
 274                       struct txdone_entry_desc *txdesc)
 275 {
 276         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 277         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 278         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 279         unsigned int header_length, i;
 280         u8 rate_idx, rate_flags, retry_rates;
 281         u8 skbdesc_flags = skbdesc->flags;
 282         bool success;
 283
 284         /*
 285          * Unmap the skb.
 286          */
 287         rt2x00queue_unmap_skb(entry);
 288
 289         /*
 290          * Remove the extra tx headroom from the skb.
 291          */
 292         skb_pull(entry->skb, rt2x00dev->ops->extra_tx_headroom);
 293
 294         /*
 295          * Signal that the TX descriptor is no longer in the skb.
 296          */
 297         skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
 298
 299         /*
 300          * Determine the length of 802.11 header.
 301          */
 302         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 303
 304         /*
 305          * Remove L2 padding which was added during
 306          */
 307         if (test_bit(REQUIRE_L2PAD, &rt2x00dev->cap_flags))
 308                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 309
 310         /*
 311          * If the IV/EIV data was stripped from the frame before it was
 312          * passed to the hardware, we should now reinsert it again because
 313          * mac80211 will expect the same data to be present it the
 314          * frame as it was passed to us.
 315          */
 316         if (test_bit(CAPABILITY_HW_CRYPTO, &rt2x00dev->cap_flags))
 317                 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
 318
 319         /*
 320          * Send frame to debugfs immediately, after this call is completed
 321          * we are going to overwrite the skb->cb array.
 322          */
 323         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 324
 325         /*
 326          * Determine if the frame has been successfully transmitted.
 327          */
 328         success =
 329             test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 330             test_bit(TXDONE_UNKNOWN, &txdesc->flags);
 331
 332         /*
 333          * Update TX statistics.
 334          */
 335         rt2x00dev->link.qual.tx_success += success;
 336         rt2x00dev->link.qual.tx_failed += !success;
 337
 338         rate_idx = skbdesc->tx_rate_idx;
 339         rate_flags = skbdesc->tx_rate_flags;
 340         retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
 341             (txdesc->retry + 1) : 1;
 342
 343         /*
 344          * Initialize TX status
 345          */
 346         memset(&tx_info->status, 0, sizeof(tx_info->status));
 347         tx_info->status.ack_signal = 0;
 348
 349         /*
 350          * Frame was send with retries, hardware tried
 351          * different rates to send out the frame, at each
 352          * retry it lowered the rate 1 step except when the
 353          * lowest rate was used.
 354          */
 355         for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
 356                 tx_info->status.rates[i].idx = rate_idx - i;
 357                 tx_info->status.rates[i].flags = rate_flags;
 358
 359                 if (rate_idx - i == 0) {
 360                         /*
 361                          * The lowest rate (index 0) was used until the
 362                          * number of max retries was reached.
 363                          */
 364                         tx_info->status.rates[i].count = retry_rates - i;
 365                         i++;
 366                         break;
 367                 }
 368                 tx_info->status.rates[i].count = 1;
 369         }
 370         if (i < (IEEE80211_TX_MAX_RATES - 1))
 371                 tx_info->status.rates[i].idx = -1; /* terminate */
 372
 373         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 374                 if (success)
 375                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 376                 else
 377                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 378         }
 379
 380         /*
 381          * Every single frame has it's own tx status, hence report
 382          * every frame as ampdu of size 1.
 383          *
 384          * TODO: if we can find out how many frames were aggregated
 385          * by the hw we could provide the real ampdu_len to mac80211
 386          * which would allow the rc algorithm to better decide on
 387          * which rates are suitable.
 388          */
 389         if (test_bit(TXDONE_AMPDU, &txdesc->flags) ||
 390             tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 391                 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
 392                 tx_info->status.ampdu_len = 1;
 393                 tx_info->status.ampdu_ack_len = success ? 1 : 0;
 394
 395                 if (!success)
 396                         tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
 397         }
 398
 399         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 400                 if (success)
 401                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 402                 else
 403                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 404         }
 405
 406         /*
 407          * Only send the status report to mac80211 when it's a frame
 408          * that originated in mac80211. If this was a extra frame coming
 409          * through a mac80211 library call (RTS/CTS) then we should not
 410          * send the status report back.
 411          */
 412         if (!(skbdesc_flags & SKBDESC_NOT_MAC80211)) {
 413                 if (test_bit(REQUIRE_TASKLET_CONTEXT, &rt2x00dev->cap_flags))
 414                         ieee80211_tx_status(rt2x00dev->hw, entry->skb);
 415                 else
 416                         ieee80211_tx_status_ni(rt2x00dev->hw, entry->skb);
 417         } else
 418                 dev_kfree_skb_any(entry->skb);
 419
 420         /*
 421          * Make this entry available for reuse.
 422          */
 423         entry->skb = NULL;
 424         entry->flags = 0;
 425
 426         rt2x00dev->ops->lib->clear_entry(entry);
 427
 428         rt2x00queue_index_inc(entry, Q_INDEX_DONE);
 429
 430         /*
 431          * If the data queue was below the threshold before the txdone
 432          * handler we must make sure the packet queue in the mac80211 stack
 433          * is reenabled when the txdone handler has finished. This has to be
 434          * serialized with rt2x00mac_tx(), otherwise we can wake up queue
 435          * before it was stopped.
 436          */
 437         spin_lock_bh(&entry->queue->tx_lock);
 438         if (!rt2x00queue_threshold(entry->queue))
 439                 rt2x00queue_unpause_queue(entry->queue);
 440         spin_unlock_bh(&entry->queue->tx_lock);
 441 }
 442 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 443
 444 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
 445 {
 446         struct txdone_entry_desc txdesc;
 447
 448         txdesc.flags = 0;
 449         __set_bit(status, &txdesc.flags);
 450         txdesc.retry = 0;
 451
 452         rt2x00lib_txdone(entry, &txdesc);
 453 }
 454 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
 455
 456 static u8 *rt2x00lib_find_ie(u8 *data, unsigned int len, u8 ie)
 457 {
 458         struct ieee80211_mgmt *mgmt = (void *)data;
 459         u8 *pos, *end;
 460
 461         pos = (u8 *)mgmt->u.beacon.variable;
 462         end = data + len;
 463         while (pos < end) {
 464                 if (pos + 2 + pos[1] > end)
 465                         return NULL;
 466
 467                 if (pos[0] == ie)
 468                         return pos;
 469
 470                 pos += 2 + pos[1];
 471         }
 472
 473         return NULL;
 474 }
 475
 476 static void rt2x00lib_sleep(struct work_struct *work)
 477 {
 478         struct rt2x00_dev *rt2x00dev =
 479             container_of(work, struct rt2x00_dev, sleep_work);
 480
 481         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 482                 return;
 483
 484         /*
 485          * Check again is powersaving is enabled, to prevent races from delayed
 486          * work execution.
 487          */
 488         if (!test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 489                 rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf,
 490                                  IEEE80211_CONF_CHANGE_PS);
 491 }
 492
 493 static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev,
 494                                       struct sk_buff *skb,
 495                                       struct rxdone_entry_desc *rxdesc)
 496 {
 497         struct ieee80211_hdr *hdr = (void *) skb->data;
 498         struct ieee80211_tim_ie *tim_ie;
 499         u8 *tim;
 500         u8 tim_len;
 501         bool cam;
 502
 503         /* If this is not a beacon, or if mac80211 has no powersaving
 504          * configured, or if the device is already in powersaving mode
 505          * we can exit now. */
 506         if (likely(!ieee80211_is_beacon(hdr->frame_control) ||
 507                    !(rt2x00dev->hw->conf.flags & IEEE80211_CONF_PS)))
 508                 return;
 509
 510         /* min. beacon length + FCS_LEN */
 511         if (skb->len <= 40 + FCS_LEN)
 512                 return;
 513
 514         /* and only beacons from the associated BSSID, please */
 515         if (!(rxdesc->dev_flags & RXDONE_MY_BSS) ||
 516             !rt2x00dev->aid)
 517                 return;
 518
 519         rt2x00dev->last_beacon = jiffies;
 520
 521         tim = rt2x00lib_find_ie(skb->data, skb->len - FCS_LEN, WLAN_EID_TIM);
 522         if (!tim)
 523                 return;
 524
 525         if (tim[1] < sizeof(*tim_ie))
 526                 return;
 527
 528         tim_len = tim[1];
 529         tim_ie = (struct ieee80211_tim_ie *) &tim[2];
 530
 531         /* Check whenever the PHY can be turned off again. */
 532
 533         /* 1. What about buffered unicast traffic for our AID? */
 534         cam = ieee80211_check_tim(tim_ie, tim_len, rt2x00dev->aid);
 535
 536         /* 2. Maybe the AP wants to send multicast/broadcast data? */
 537         cam |= (tim_ie->bitmap_ctrl & 0x01);
 538
 539         if (!cam && !test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 540                 queue_work(rt2x00dev->workqueue, &rt2x00dev->sleep_work);
 541 }
 542
 543 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 544                                         struct rxdone_entry_desc *rxdesc)
 545 {
 546         struct ieee80211_supported_band *sband;
 547         const struct rt2x00_rate *rate;
 548         unsigned int i;
 549         int signal = rxdesc->signal;
 550         int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 551
 552         switch (rxdesc->rate_mode) {
 553         case RATE_MODE_CCK:
 554         case RATE_MODE_OFDM:
 555                 /*
 556                  * For non-HT rates the MCS value needs to contain the
 557                  * actually used rate modulation (CCK or OFDM).
 558                  */
 559                 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 560                         signal = RATE_MCS(rxdesc->rate_mode, signal);
 561
 562                 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 563                 for (i = 0; i < sband->n_bitrates; i++) {
 564                         rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 565                         if (((type == RXDONE_SIGNAL_PLCP) &&
 566                              (rate->plcp == signal)) ||
 567                             ((type == RXDONE_SIGNAL_BITRATE) &&
 568                               (rate->bitrate == signal)) ||
 569                             ((type == RXDONE_SIGNAL_MCS) &&
 570                               (rate->mcs == signal))) {
 571                                 return i;
 572                         }
 573                 }
 574                 break;
 575         case RATE_MODE_HT_MIX:
 576         case RATE_MODE_HT_GREENFIELD:
 577                 if (signal >= 0 && signal <= 76)
 578                         return signal;
 579                 break;
 580         default:
 581                 break;
 582         }
 583
 584         WARNING(rt2x00dev, "Frame received with unrecognized signal, "
 585                 "mode=0x%.4x, signal=0x%.4x, type=%d.\n",
 586                 rxdesc->rate_mode, signal, type);
 587         return 0;
 588 }
 589
 590 void rt2x00lib_rxdone(struct queue_entry *entry)
 591 {
 592         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 593         struct rxdone_entry_desc rxdesc;
 594         struct sk_buff *skb;
 595         struct ieee80211_rx_status *rx_status;
 596         unsigned int header_length;
 597         int rate_idx;
 598
 599         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 600             !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 601                 goto submit_entry;
 602
 603         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 604                 goto submit_entry;
 605
 606         /*
 607          * Allocate a new sk_buffer. If no new buffer available, drop the
 608          * received frame and reuse the existing buffer.
 609          */
 610         skb = rt2x00queue_alloc_rxskb(entry);
 611         if (!skb)
 612                 goto submit_entry;
 613
 614         /*
 615          * Unmap the skb.
 616          */
 617         rt2x00queue_unmap_skb(entry);
 618
 619         /*
 620          * Extract the RXD details.
 621          */
 622         memset(&rxdesc, 0, sizeof(rxdesc));
 623         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 624
 625         /*
 626          * Check for valid size in case we get corrupted descriptor from
 627          * hardware.
 628          */
 629         if (unlikely(rxdesc.size == 0 ||
 630                      rxdesc.size > entry->queue->data_size)) {
 631                 WARNING(rt2x00dev, "Wrong frame size %d max %d.\n",
 632                         rxdesc.size, entry->queue->data_size);
 633                 dev_kfree_skb(entry->skb);
 634                 goto renew_skb;
 635         }
 636
 637         /*
 638          * The data behind the ieee80211 header must be
 639          * aligned on a 4 byte boundary.
 640          */
 641         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 642
 643         /*
 644          * Hardware might have stripped the IV/EIV/ICV data,
 645          * in that case it is possible that the data was
 646          * provided separately (through hardware descriptor)
 647          * in which case we should reinsert the data into the frame.
 648          */
 649         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 650             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 651                 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
 652                                           &rxdesc);
 653         else if (header_length &&
 654                  (rxdesc.size > header_length) &&
 655                  (rxdesc.dev_flags & RXDONE_L2PAD))
 656                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 657
 658         /* Trim buffer to correct size */
 659         skb_trim(entry->skb, rxdesc.size);
 660
 661         /*
 662          * Translate the signal to the correct bitrate index.
 663          */
 664         rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 665         if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
 666             rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
 667                 rxdesc.flags |= RX_FLAG_HT;
 668
 669         /*
 670          * Check if this is a beacon, and more frames have been
 671          * buffered while we were in powersaving mode.
 672          */
 673         rt2x00lib_rxdone_check_ps(rt2x00dev, entry->skb, &rxdesc);
 674
 675         /*
 676          * Update extra components
 677          */
 678         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 679         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 680         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 681
 682         /*
 683          * Initialize RX status information, and send frame
 684          * to mac80211.
 685          */
 686         rx_status = IEEE80211_SKB_RXCB(entry->skb);
 687         rx_status->mactime = rxdesc.timestamp;
 688         rx_status->band = rt2x00dev->curr_band;
 689         rx_status->freq = rt2x00dev->curr_freq;
 690         rx_status->rate_idx = rate_idx;
 691         rx_status->signal = rxdesc.rssi;
 692         rx_status->flag = rxdesc.flags;
 693         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 694
 695         ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
 696
 697 renew_skb:
 698         /*
 699          * Replace the skb with the freshly allocated one.
 700          */
 701         entry->skb = skb;
 702
 703 submit_entry:
 704         entry->flags = 0;
 705         rt2x00queue_index_inc(entry, Q_INDEX_DONE);
 706         if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
 707             test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 708                 rt2x00dev->ops->lib->clear_entry(entry);
 709 }
 710 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 711
 712 /*
 713  * Driver initialization handlers.
 714  */
 715 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 716         {
 717                 .flags = DEV_RATE_CCK,
 718                 .bitrate = 10,
 719                 .ratemask = BIT(0),
 720                 .plcp = 0x00,
 721                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 722         },
 723         {
 724                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 725                 .bitrate = 20,
 726                 .ratemask = BIT(1),
 727                 .plcp = 0x01,
 728                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 729         },
 730         {
 731                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 732                 .bitrate = 55,
 733                 .ratemask = BIT(2),
 734                 .plcp = 0x02,
 735                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 736         },
 737         {
 738                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 739                 .bitrate = 110,
 740                 .ratemask = BIT(3),
 741                 .plcp = 0x03,
 742                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 743         },
 744         {
 745                 .flags = DEV_RATE_OFDM,
 746                 .bitrate = 60,
 747                 .ratemask = BIT(4),
 748                 .plcp = 0x0b,
 749                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 750         },
 751         {
 752                 .flags = DEV_RATE_OFDM,
 753                 .bitrate = 90,
 754                 .ratemask = BIT(5),
 755                 .plcp = 0x0f,
 756                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 757         },
 758         {
 759                 .flags = DEV_RATE_OFDM,
 760                 .bitrate = 120,
 761                 .ratemask = BIT(6),
 762                 .plcp = 0x0a,
 763                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 764         },
 765         {
 766                 .flags = DEV_RATE_OFDM,
 767                 .bitrate = 180,
 768                 .ratemask = BIT(7),
 769                 .plcp = 0x0e,
 770                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 771         },
 772         {
 773                 .flags = DEV_RATE_OFDM,
 774                 .bitrate = 240,
 775                 .ratemask = BIT(8),
 776                 .plcp = 0x09,
 777                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 778         },
 779         {
 780                 .flags = DEV_RATE_OFDM,
 781                 .bitrate = 360,
 782                 .ratemask = BIT(9),
 783                 .plcp = 0x0d,
 784                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 785         },
 786         {
 787                 .flags = DEV_RATE_OFDM,
 788                 .bitrate = 480,
 789                 .ratemask = BIT(10),
 790                 .plcp = 0x08,
 791                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 792         },
 793         {
 794                 .flags = DEV_RATE_OFDM,
 795                 .bitrate = 540,
 796                 .ratemask = BIT(11),
 797                 .plcp = 0x0c,
 798                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 799         },
 800 };
 801
 802 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 803                               const int channel, const int tx_power,
 804                               const int value)
 805 {
 806         /* XXX: this assumption about the band is wrong for 802.11j */
 807         entry->band = channel <= 14 ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 808         entry->center_freq = ieee80211_channel_to_frequency(channel,
 809                                                             entry->band);
 810         entry->hw_value = value;
 811         entry->max_power = tx_power;
 812         entry->max_antenna_gain = 0xff;
 813 }
 814
 815 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 816                            const u16 index, const struct rt2x00_rate *rate)
 817 {
 818         entry->flags = 0;
 819         entry->bitrate = rate->bitrate;
 820         entry->hw_value = index;
 821         entry->hw_value_short = index;
 822
 823         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 824                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 825 }
 826
 827 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 828                                     struct hw_mode_spec *spec)
 829 {
 830         struct ieee80211_hw *hw = rt2x00dev->hw;
 831         struct ieee80211_channel *channels;
 832         struct ieee80211_rate *rates;
 833         unsigned int num_rates;
 834         unsigned int i;
 835
 836         num_rates = 0;
 837         if (spec->supported_rates & SUPPORT_RATE_CCK)
 838                 num_rates += 4;
 839         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 840                 num_rates += 8;
 841
 842         channels = kcalloc(spec->num_channels, sizeof(*channels), GFP_KERNEL);
 843         if (!channels)
 844                 return -ENOMEM;
 845
 846         rates = kcalloc(num_rates, sizeof(*rates), GFP_KERNEL);
 847         if (!rates)
 848                 goto exit_free_channels;
 849
 850         /*
 851          * Initialize Rate list.
 852          */
 853         for (i = 0; i < num_rates; i++)
 854                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 855
 856         /*
 857          * Initialize Channel list.
 858          */
 859         for (i = 0; i < spec->num_channels; i++) {
 860                 rt2x00lib_channel(&channels[i],
 861                                   spec->channels[i].channel,
 862                                   spec->channels_info[i].max_power, i);
 863         }
 864
 865         /*
 866          * Intitialize 802.11b, 802.11g
 867          * Rates: CCK, OFDM.
 868          * Channels: 2.4 GHz
 869          */
 870         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 871                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 872                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 873                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 874                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 875                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 876                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 877                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
 878                        &spec->ht, sizeof(spec->ht));
 879         }
 880
 881         /*
 882          * Intitialize 802.11a
 883          * Rates: OFDM.
 884          * Channels: OFDM, UNII, HiperLAN2.
 885          */
 886         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 887                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 888                     spec->num_channels - 14;
 889                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 890                     num_rates - 4;
 891                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 892                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 893                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 894                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 895                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
 896                        &spec->ht, sizeof(spec->ht));
 897         }
 898
 899         return 0;
 900
 901  exit_free_channels:
 902         kfree(channels);
 903         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 904         return -ENOMEM;
 905 }
 906
 907 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 908 {
 909         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 910                 ieee80211_unregister_hw(rt2x00dev->hw);
 911
 912         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 913                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 914                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 915                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 916                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 917         }
 918
 919         kfree(rt2x00dev->spec.channels_info);
 920 }
 921
 922 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 923 {
 924         struct hw_mode_spec *spec = &rt2x00dev->spec;
 925         int status;
 926
 927         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 928                 return 0;
 929
 930         /*
 931          * Initialize HW modes.
 932          */
 933         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 934         if (status)
 935                 return status;
 936
 937         /*
 938          * Initialize HW fields.
 939          */
 940         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 941
 942         /*
 943          * Initialize extra TX headroom required.
 944          */
 945         rt2x00dev->hw->extra_tx_headroom =
 946                 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
 947                       rt2x00dev->ops->extra_tx_headroom);
 948
 949         /*
 950          * Take TX headroom required for alignment into account.
 951          */
 952         if (test_bit(REQUIRE_L2PAD, &rt2x00dev->cap_flags))
 953                 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
 954         else if (test_bit(REQUIRE_DMA, &rt2x00dev->cap_flags))
 955                 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
 956
 957         /*
 958          * Tell mac80211 about the size of our private STA structure.
 959          */
 960         rt2x00dev->hw->sta_data_size = sizeof(struct rt2x00_sta);
 961
 962         /*
 963          * Allocate tx status FIFO for driver use.
 964          */
 965         if (test_bit(REQUIRE_TXSTATUS_FIFO, &rt2x00dev->cap_flags)) {
 966                 /*
 967                  * Allocate the txstatus fifo. In the worst case the tx
 968                  * status fifo has to hold the tx status of all entries
 969                  * in all tx queues. Hence, calculate the kfifo size as
 970                  * tx_queues * entry_num and round up to the nearest
 971                  * power of 2.
 972                  */
 973                 int kfifo_size =
 974                         roundup_pow_of_two(rt2x00dev->ops->tx_queues *
 975                                            rt2x00dev->ops->tx->entry_num *
 976                                            sizeof(u32));
 977
 978                 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, kfifo_size,
 979                                      GFP_KERNEL);
 980                 if (status)
 981                         return status;
 982         }
 983
 984         /*
 985          * Initialize tasklets if used by the driver. Tasklets are
 986          * disabled until the interrupts are turned on. The driver
 987          * has to handle that.
 988          */
 989 #define RT2X00_TASKLET_INIT(taskletname) \
 990         if (rt2x00dev->ops->lib->taskletname) { \
 991                 tasklet_init(&rt2x00dev->taskletname, \
 992                              rt2x00dev->ops->lib->taskletname, \
 993                              (unsigned long)rt2x00dev); \
 994         }
 995
 996         RT2X00_TASKLET_INIT(txstatus_tasklet);
 997         RT2X00_TASKLET_INIT(pretbtt_tasklet);
 998         RT2X00_TASKLET_INIT(tbtt_tasklet);
 999         RT2X00_TASKLET_INIT(rxdone_tasklet);
1000         RT2X00_TASKLET_INIT(autowake_tasklet);
1001
1002 #undef RT2X00_TASKLET_INIT
1003
1004         /*
1005          * Register HW.
1006          */
1007         status = ieee80211_register_hw(rt2x00dev->hw);
1008         if (status)
1009                 return status;
1010
1011         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
1012
1013         return 0;
1014 }
1015
1016 /*
1017  * Initialization/uninitialization handlers.
1018  */
1019 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
1020 {
1021         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1022                 return;
1023
1024         /*
1025          * Unregister extra components.
1026          */
1027         rt2x00rfkill_unregister(rt2x00dev);
1028
1029         /*
1030          * Allow the HW to uninitialize.
1031          */
1032         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1033
1034         /*
1035          * Free allocated queue entries.
1036          */
1037         rt2x00queue_uninitialize(rt2x00dev);
1038 }
1039
1040 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1041 {
1042         int status;
1043
1044         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1045                 return 0;
1046
1047         /*
1048          * Allocate all queue entries.
1049          */
1050         status = rt2x00queue_initialize(rt2x00dev);
1051         if (status)
1052                 return status;
1053
1054         /*
1055          * Initialize the device.
1056          */
1057         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1058         if (status) {
1059                 rt2x00queue_uninitialize(rt2x00dev);
1060                 return status;
1061         }
1062
1063         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
1064
1065         return 0;
1066 }
1067
1068 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1069 {
1070         int retval;
1071
1072         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1073                 return 0;
1074
1075         /*
1076          * If this is the first interface which is added,
1077          * we should load the firmware now.
1078          */
1079         retval = rt2x00lib_load_firmware(rt2x00dev);
1080         if (retval)
1081                 return retval;
1082
1083         /*
1084          * Initialize the device.
1085          */
1086         retval = rt2x00lib_initialize(rt2x00dev);
1087         if (retval)
1088                 return retval;
1089
1090         rt2x00dev->intf_ap_count = 0;
1091         rt2x00dev->intf_sta_count = 0;
1092         rt2x00dev->intf_associated = 0;
1093
1094         /* Enable the radio */
1095         retval = rt2x00lib_enable_radio(rt2x00dev);
1096         if (retval)
1097                 return retval;
1098
1099         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
1100
1101         return 0;
1102 }
1103
1104 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1105 {
1106         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1107                 return;
1108
1109         /*
1110          * Perhaps we can add something smarter here,
1111          * but for now just disabling the radio should do.
1112          */
1113         rt2x00lib_disable_radio(rt2x00dev);
1114
1115         rt2x00dev->intf_ap_count = 0;
1116         rt2x00dev->intf_sta_count = 0;
1117         rt2x00dev->intf_associated = 0;
1118 }
1119
1120 /*
1121  * driver allocation handlers.
1122  */
1123 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1124 {
1125         int retval = -ENOMEM;
1126
1127         /*
1128          * Allocate the driver data memory, if necessary.
1129          */
1130         if (rt2x00dev->ops->drv_data_size > 0) {
1131                 rt2x00dev->drv_data = kzalloc(rt2x00dev->ops->drv_data_size,
1132                                               GFP_KERNEL);
1133                 if (!rt2x00dev->drv_data) {
1134                         retval = -ENOMEM;
1135                         goto exit;
1136                 }
1137         }
1138
1139         spin_lock_init(&rt2x00dev->irqmask_lock);
1140         mutex_init(&rt2x00dev->csr_mutex);
1141
1142         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1143
1144         /*
1145          * Make room for rt2x00_intf inside the per-interface
1146          * structure ieee80211_vif.
1147          */
1148         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1149
1150         /*
1151          * Determine which operating modes are supported, all modes
1152          * which require beaconing, depend on the availability of
1153          * beacon entries.
1154          */
1155         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
1156         if (rt2x00dev->ops->bcn->entry_num > 0)
1157                 rt2x00dev->hw->wiphy->interface_modes |=
1158                     BIT(NL80211_IFTYPE_ADHOC) |
1159                     BIT(NL80211_IFTYPE_AP) |
1160                     BIT(NL80211_IFTYPE_MESH_POINT) |
1161                     BIT(NL80211_IFTYPE_WDS);
1162
1163         /*
1164          * Initialize work.
1165          */
1166         rt2x00dev->workqueue =
1167             alloc_ordered_workqueue(wiphy_name(rt2x00dev->hw->wiphy), 0);
1168         if (!rt2x00dev->workqueue) {
1169                 retval = -ENOMEM;
1170                 goto exit;
1171         }
1172
1173         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1174         INIT_DELAYED_WORK(&rt2x00dev->autowakeup_work, rt2x00lib_autowakeup);
1175         INIT_WORK(&rt2x00dev->sleep_work, rt2x00lib_sleep);
1176
1177         /*
1178          * Let the driver probe the device to detect the capabilities.
1179          */
1180         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1181         if (retval) {
1182                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1183                 goto exit;
1184         }
1185
1186         /*
1187          * Allocate queue array.
1188          */
1189         retval = rt2x00queue_allocate(rt2x00dev);
1190         if (retval)
1191                 goto exit;
1192
1193         /*
1194          * Initialize ieee80211 structure.
1195          */
1196         retval = rt2x00lib_probe_hw(rt2x00dev);
1197         if (retval) {
1198                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1199                 goto exit;
1200         }
1201
1202         /*
1203          * Register extra components.
1204          */
1205         rt2x00link_register(rt2x00dev);
1206         rt2x00leds_register(rt2x00dev);
1207         rt2x00debug_register(rt2x00dev);
1208         rt2x00rfkill_register(rt2x00dev);
1209
1210         return 0;
1211
1212 exit:
1213         rt2x00lib_remove_dev(rt2x00dev);
1214
1215         return retval;
1216 }
1217 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1218
1219 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1220 {
1221         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1222
1223         /*
1224          * Disable radio.
1225          */
1226         rt2x00lib_disable_radio(rt2x00dev);
1227
1228         /*
1229          * Stop all work.
1230          */
1231         cancel_work_sync(&rt2x00dev->intf_work);
1232         cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
1233         cancel_work_sync(&rt2x00dev->sleep_work);
1234         if (rt2x00_is_usb(rt2x00dev)) {
1235                 hrtimer_cancel(&rt2x00dev->txstatus_timer);
1236                 cancel_work_sync(&rt2x00dev->rxdone_work);
1237                 cancel_work_sync(&rt2x00dev->txdone_work);
1238         }
1239         if (rt2x00dev->workqueue)
1240                 destroy_workqueue(rt2x00dev->workqueue);
1241
1242         /*
1243          * Free the tx status fifo.
1244          */
1245         kfifo_free(&rt2x00dev->txstatus_fifo);
1246
1247         /*
1248          * Kill the tx status tasklet.
1249          */
1250         tasklet_kill(&rt2x00dev->txstatus_tasklet);
1251         tasklet_kill(&rt2x00dev->pretbtt_tasklet);
1252         tasklet_kill(&rt2x00dev->tbtt_tasklet);
1253         tasklet_kill(&rt2x00dev->rxdone_tasklet);
1254         tasklet_kill(&rt2x00dev->autowake_tasklet);
1255
1256         /*
1257          * Uninitialize device.
1258          */
1259         rt2x00lib_uninitialize(rt2x00dev);
1260
1261         /*
1262          * Free extra components
1263          */
1264         rt2x00debug_deregister(rt2x00dev);
1265         rt2x00leds_unregister(rt2x00dev);
1266
1267         /*
1268          * Free ieee80211_hw memory.
1269          */
1270         rt2x00lib_remove_hw(rt2x00dev);
1271
1272         /*
1273          * Free firmware image.
1274          */
1275         rt2x00lib_free_firmware(rt2x00dev);
1276
1277         /*
1278          * Free queue structures.
1279          */
1280         rt2x00queue_free(rt2x00dev);
1281
1282         /*
1283          * Free the driver data.
1284          */
1285         if (rt2x00dev->drv_data)
1286                 kfree(rt2x00dev->drv_data);
1287 }
1288 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1289
1290 /*
1291  * Device state handlers
1292  */
1293 #ifdef CONFIG_PM
1294 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1295 {
1296         NOTICE(rt2x00dev, "Going to sleep.\n");
1297
1298         /*
1299          * Prevent mac80211 from accessing driver while suspended.
1300          */
1301         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1302                 return 0;
1303
1304         /*
1305          * Cleanup as much as possible.
1306          */
1307         rt2x00lib_uninitialize(rt2x00dev);
1308
1309         /*
1310          * Suspend/disable extra components.
1311          */
1312         rt2x00leds_suspend(rt2x00dev);
1313         rt2x00debug_deregister(rt2x00dev);
1314
1315         /*
1316          * Set device mode to sleep for power management,
1317          * on some hardware this call seems to consistently fail.
1318          * From the specifications it is hard to tell why it fails,
1319          * and if this is a "bad thing".
1320          * Overall it is safe to just ignore the failure and
1321          * continue suspending. The only downside is that the
1322          * device will not be in optimal power save mode, but with
1323          * the radio and the other components already disabled the
1324          * device is as good as disabled.
1325          */
1326         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1327                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1328                         "continue suspending.\n");
1329
1330         return 0;
1331 }
1332 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1333
1334 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1335 {
1336         NOTICE(rt2x00dev, "Waking up.\n");
1337
1338         /*
1339          * Restore/enable extra components.
1340          */
1341         rt2x00debug_register(rt2x00dev);
1342         rt2x00leds_resume(rt2x00dev);
1343
1344         /*
1345          * We are ready again to receive requests from mac80211.
1346          */
1347         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1348
1349         return 0;
1350 }
1351 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1352 #endif /* CONFIG_PM */
1353
1354 /*
1355  * rt2x00lib module information.
1356  */
1357 MODULE_AUTHOR(DRV_PROJECT);
1358 MODULE_VERSION(DRV_VERSION);
1359 MODULE_DESCRIPTION("rt2x00 library");
1360 MODULE_LICENSE("GPL");