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  * Radio control handlers.
  37  */
  38 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  39 {
  40         int status;
  41
  42         /*
  43          * Don't enable the radio twice.
  44          * And check if the hardware button has been disabled.
  45          */
  46         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  47                 return 0;
  48
  49         /*
  50          * Initialize all data queues.
  51          */
  52         rt2x00queue_init_queues(rt2x00dev);
  53
  54         /*
  55          * Enable radio.
  56          */
  57         status =
  58             rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
  59         if (status)
  60                 return status;
  61
  62         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
  63
  64         rt2x00leds_led_radio(rt2x00dev, true);
  65         rt2x00led_led_activity(rt2x00dev, true);
  66
  67         set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
  68
  69         /*
  70          * Enable queues.
  71          */
  72         rt2x00queue_start_queues(rt2x00dev);
  73         rt2x00link_start_tuner(rt2x00dev);
  74         rt2x00link_start_agc(rt2x00dev);
  75
  76         /*
  77          * Start watchdog monitoring.
  78          */
  79         rt2x00link_start_watchdog(rt2x00dev);
  80
  81         return 0;
  82 }
  83
  84 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
  85 {
  86         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  87                 return;
  88
  89         /*
  90          * Stop watchdog monitoring.
  91          */
  92         rt2x00link_stop_watchdog(rt2x00dev);
  93
  94         /*
  95          * Stop all queues
  96          */
  97         rt2x00link_stop_agc(rt2x00dev);
  98         rt2x00link_stop_tuner(rt2x00dev);
  99         rt2x00queue_stop_queues(rt2x00dev);
 100         rt2x00queue_flush_queues(rt2x00dev, true);
 101
 102         /*
 103          * Disable radio.
 104          */
 105         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 106         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 107         rt2x00led_led_activity(rt2x00dev, false);
 108         rt2x00leds_led_radio(rt2x00dev, false);
 109 }
 110
 111 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 112                                           struct ieee80211_vif *vif)
 113 {
 114         struct rt2x00_dev *rt2x00dev = data;
 115         struct rt2x00_intf *intf = vif_to_intf(vif);
 116
 117         /*
 118          * It is possible the radio was disabled while the work had been
 119          * scheduled. If that happens we should return here immediately,
 120          * note that in the spinlock protected area above the delayed_flags
 121          * have been cleared correctly.
 122          */
 123         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 124                 return;
 125
 126         if (test_and_clear_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags))
 127                 rt2x00queue_update_beacon(rt2x00dev, vif);
 128 }
 129
 130 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 131 {
 132         struct rt2x00_dev *rt2x00dev =
 133             container_of(work, struct rt2x00_dev, intf_work);
 134
 135         /*
 136          * Iterate over each interface and perform the
 137          * requested configurations.
 138          */
 139         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 140                                             rt2x00lib_intf_scheduled_iter,
 141                                             rt2x00dev);
 142 }
 143
 144 static void rt2x00lib_autowakeup(struct work_struct *work)
 145 {
 146         struct rt2x00_dev *rt2x00dev =
 147             container_of(work, struct rt2x00_dev, autowakeup_work.work);
 148
 149         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 150                 return;
 151
 152         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_AWAKE))
 153                 ERROR(rt2x00dev, "Device failed to wakeup.\n");
 154         clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
 155 }
 156
 157 /*
 158  * Interrupt context handlers.
 159  */
 160 static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac,
 161                                      struct ieee80211_vif *vif)
 162 {
 163         struct rt2x00_dev *rt2x00dev = data;
 164         struct sk_buff *skb;
 165
 166         /*
 167          * Only AP mode interfaces do broad- and multicast buffering
 168          */
 169         if (vif->type != NL80211_IFTYPE_AP)
 170                 return;
 171
 172         /*
 173          * Send out buffered broad- and multicast frames
 174          */
 175         skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 176         while (skb) {
 177                 rt2x00mac_tx(rt2x00dev->hw, skb);
 178                 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 179         }
 180 }
 181
 182 static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac,
 183                                         struct ieee80211_vif *vif)
 184 {
 185         struct rt2x00_dev *rt2x00dev = data;
 186
 187         if (vif->type != NL80211_IFTYPE_AP &&
 188             vif->type != NL80211_IFTYPE_ADHOC &&
 189             vif->type != NL80211_IFTYPE_MESH_POINT &&
 190             vif->type != NL80211_IFTYPE_WDS)
 191                 return;
 192
 193         /*
 194          * Update the beacon without locking. This is safe on PCI devices
 195          * as they only update the beacon periodically here. This should
 196          * never be called for USB devices.
 197          */
 198         WARN_ON(rt2x00_is_usb(rt2x00dev));
 199         rt2x00queue_update_beacon_locked(rt2x00dev, vif);
 200 }
 201
 202 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 203 {
 204         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 205                 return;
 206
 207         /* send buffered bc/mc frames out for every bssid */
 208         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 209                                                    rt2x00lib_bc_buffer_iter,
 210                                                    rt2x00dev);
 211         /*
 212          * Devices with pre tbtt interrupt don't need to update the beacon
 213          * here as they will fetch the next beacon directly prior to
 214          * transmission.
 215          */
 216         if (test_bit(CAPABILITY_PRE_TBTT_INTERRUPT, &rt2x00dev->cap_flags))
 217                 return;
 218
 219         /* fetch next beacon */
 220         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 221                                                    rt2x00lib_beaconupdate_iter,
 222                                                    rt2x00dev);
 223 }
 224 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 225
 226 void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev)
 227 {
 228         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 229                 return;
 230
 231         /* fetch next beacon */
 232         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 233                                                    rt2x00lib_beaconupdate_iter,
 234                                                    rt2x00dev);
 235 }
 236 EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
 237
 238 void rt2x00lib_dmastart(struct queue_entry *entry)
 239 {
 240         set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 241         rt2x00queue_index_inc(entry, Q_INDEX);
 242 }
 243 EXPORT_SYMBOL_GPL(rt2x00lib_dmastart);
 244
 245 void rt2x00lib_dmadone(struct queue_entry *entry)
 246 {
 247         set_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags);
 248         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 249         rt2x00queue_index_inc(entry, Q_INDEX_DMA_DONE);
 250 }
 251 EXPORT_SYMBOL_GPL(rt2x00lib_dmadone);
 252
 253 void rt2x00lib_txdone(struct queue_entry *entry,
 254                       struct txdone_entry_desc *txdesc)
 255 {
 256         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 257         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 258         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 259         unsigned int header_length, i;
 260         u8 rate_idx, rate_flags, retry_rates;
 261         u8 skbdesc_flags = skbdesc->flags;
 262         bool success;
 263
 264         /*
 265          * Unmap the skb.
 266          */
 267         rt2x00queue_unmap_skb(entry);
 268
 269         /*
 270          * Remove the extra tx headroom from the skb.
 271          */
 272         skb_pull(entry->skb, rt2x00dev->ops->extra_tx_headroom);
 273
 274         /*
 275          * Signal that the TX descriptor is no longer in the skb.
 276          */
 277         skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
 278
 279         /*
 280          * Determine the length of 802.11 header.
 281          */
 282         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 283
 284         /*
 285          * Remove L2 padding which was added during
 286          */
 287         if (test_bit(REQUIRE_L2PAD, &rt2x00dev->cap_flags))
 288                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 289
 290         /*
 291          * If the IV/EIV data was stripped from the frame before it was
 292          * passed to the hardware, we should now reinsert it again because
 293          * mac80211 will expect the same data to be present it the
 294          * frame as it was passed to us.
 295          */
 296         if (test_bit(CAPABILITY_HW_CRYPTO, &rt2x00dev->cap_flags))
 297                 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
 298
 299         /*
 300          * Send frame to debugfs immediately, after this call is completed
 301          * we are going to overwrite the skb->cb array.
 302          */
 303         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 304
 305         /*
 306          * Determine if the frame has been successfully transmitted.
 307          */
 308         success =
 309             test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 310             test_bit(TXDONE_UNKNOWN, &txdesc->flags);
 311
 312         /*
 313          * Update TX statistics.
 314          */
 315         rt2x00dev->link.qual.tx_success += success;
 316         rt2x00dev->link.qual.tx_failed += !success;
 317
 318         rate_idx = skbdesc->tx_rate_idx;
 319         rate_flags = skbdesc->tx_rate_flags;
 320         retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
 321             (txdesc->retry + 1) : 1;
 322
 323         /*
 324          * Initialize TX status
 325          */
 326         memset(&tx_info->status, 0, sizeof(tx_info->status));
 327         tx_info->status.ack_signal = 0;
 328
 329         /*
 330          * Frame was send with retries, hardware tried
 331          * different rates to send out the frame, at each
 332          * retry it lowered the rate 1 step except when the
 333          * lowest rate was used.
 334          */
 335         for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
 336                 tx_info->status.rates[i].idx = rate_idx - i;
 337                 tx_info->status.rates[i].flags = rate_flags;
 338
 339                 if (rate_idx - i == 0) {
 340                         /*
 341                          * The lowest rate (index 0) was used until the
 342                          * number of max retries was reached.
 343                          */
 344                         tx_info->status.rates[i].count = retry_rates - i;
 345                         i++;
 346                         break;
 347                 }
 348                 tx_info->status.rates[i].count = 1;
 349         }
 350         if (i < (IEEE80211_TX_MAX_RATES - 1))
 351                 tx_info->status.rates[i].idx = -1; /* terminate */
 352
 353         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 354                 if (success)
 355                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 356                 else
 357                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 358         }
 359
 360         /*
 361          * Every single frame has it's own tx status, hence report
 362          * every frame as ampdu of size 1.
 363          *
 364          * TODO: if we can find out how many frames were aggregated
 365          * by the hw we could provide the real ampdu_len to mac80211
 366          * which would allow the rc algorithm to better decide on
 367          * which rates are suitable.
 368          */
 369         if (test_bit(TXDONE_AMPDU, &txdesc->flags) ||
 370             tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 371                 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
 372                 tx_info->status.ampdu_len = 1;
 373                 tx_info->status.ampdu_ack_len = success ? 1 : 0;
 374
 375                 if (!success)
 376                         tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
 377         }
 378
 379         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 380                 if (success)
 381                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 382                 else
 383                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 384         }
 385
 386         /*
 387          * Only send the status report to mac80211 when it's a frame
 388          * that originated in mac80211. If this was a extra frame coming
 389          * through a mac80211 library call (RTS/CTS) then we should not
 390          * send the status report back.
 391          */
 392         if (!(skbdesc_flags & SKBDESC_NOT_MAC80211)) {
 393                 if (test_bit(REQUIRE_TASKLET_CONTEXT, &rt2x00dev->cap_flags))
 394                         ieee80211_tx_status(rt2x00dev->hw, entry->skb);
 395                 else
 396                         ieee80211_tx_status_ni(rt2x00dev->hw, entry->skb);
 397         } else
 398                 dev_kfree_skb_any(entry->skb);
 399
 400         /*
 401          * Make this entry available for reuse.
 402          */
 403         entry->skb = NULL;
 404         entry->flags = 0;
 405
 406         rt2x00dev->ops->lib->clear_entry(entry);
 407
 408         rt2x00queue_index_inc(entry, Q_INDEX_DONE);
 409
 410         /*
 411          * If the data queue was below the threshold before the txdone
 412          * handler we must make sure the packet queue in the mac80211 stack
 413          * is reenabled when the txdone handler has finished.
 414          */
 415         if (!rt2x00queue_threshold(entry->queue))
 416                 rt2x00queue_unpause_queue(entry->queue);
 417 }
 418 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 419
 420 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
 421 {
 422         struct txdone_entry_desc txdesc;
 423
 424         txdesc.flags = 0;
 425         __set_bit(status, &txdesc.flags);
 426         txdesc.retry = 0;
 427
 428         rt2x00lib_txdone(entry, &txdesc);
 429 }
 430 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
 431
 432 static u8 *rt2x00lib_find_ie(u8 *data, unsigned int len, u8 ie)
 433 {
 434         struct ieee80211_mgmt *mgmt = (void *)data;
 435         u8 *pos, *end;
 436
 437         pos = (u8 *)mgmt->u.beacon.variable;
 438         end = data + len;
 439         while (pos < end) {
 440                 if (pos + 2 + pos[1] > end)
 441                         return NULL;
 442
 443                 if (pos[0] == ie)
 444                         return pos;
 445
 446                 pos += 2 + pos[1];
 447         }
 448
 449         return NULL;
 450 }
 451
 452 static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev,
 453                                       struct sk_buff *skb,
 454                                       struct rxdone_entry_desc *rxdesc)
 455 {
 456         struct ieee80211_hdr *hdr = (void *) skb->data;
 457         struct ieee80211_tim_ie *tim_ie;
 458         u8 *tim;
 459         u8 tim_len;
 460         bool cam;
 461
 462         /* If this is not a beacon, or if mac80211 has no powersaving
 463          * configured, or if the device is already in powersaving mode
 464          * we can exit now. */
 465         if (likely(!ieee80211_is_beacon(hdr->frame_control) ||
 466                    !(rt2x00dev->hw->conf.flags & IEEE80211_CONF_PS)))
 467                 return;
 468
 469         /* min. beacon length + FCS_LEN */
 470         if (skb->len <= 40 + FCS_LEN)
 471                 return;
 472
 473         /* and only beacons from the associated BSSID, please */
 474         if (!(rxdesc->dev_flags & RXDONE_MY_BSS) ||
 475             !rt2x00dev->aid)
 476                 return;
 477
 478         rt2x00dev->last_beacon = jiffies;
 479
 480         tim = rt2x00lib_find_ie(skb->data, skb->len - FCS_LEN, WLAN_EID_TIM);
 481         if (!tim)
 482                 return;
 483
 484         if (tim[1] < sizeof(*tim_ie))
 485                 return;
 486
 487         tim_len = tim[1];
 488         tim_ie = (struct ieee80211_tim_ie *) &tim[2];
 489
 490         /* Check whenever the PHY can be turned off again. */
 491
 492         /* 1. What about buffered unicast traffic for our AID? */
 493         cam = ieee80211_check_tim(tim_ie, tim_len, rt2x00dev->aid);
 494
 495         /* 2. Maybe the AP wants to send multicast/broadcast data? */
 496         cam |= (tim_ie->bitmap_ctrl & 0x01);
 497
 498         if (!cam && !test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 499                 rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf,
 500                                  IEEE80211_CONF_CHANGE_PS);
 501 }
 502
 503 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 504                                         struct rxdone_entry_desc *rxdesc)
 505 {
 506         struct ieee80211_supported_band *sband;
 507         const struct rt2x00_rate *rate;
 508         unsigned int i;
 509         int signal = rxdesc->signal;
 510         int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 511
 512         switch (rxdesc->rate_mode) {
 513         case RATE_MODE_CCK:
 514         case RATE_MODE_OFDM:
 515                 /*
 516                  * For non-HT rates the MCS value needs to contain the
 517                  * actually used rate modulation (CCK or OFDM).
 518                  */
 519                 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 520                         signal = RATE_MCS(rxdesc->rate_mode, signal);
 521
 522                 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 523                 for (i = 0; i < sband->n_bitrates; i++) {
 524                         rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 525                         if (((type == RXDONE_SIGNAL_PLCP) &&
 526                              (rate->plcp == signal)) ||
 527                             ((type == RXDONE_SIGNAL_BITRATE) &&
 528                               (rate->bitrate == signal)) ||
 529                             ((type == RXDONE_SIGNAL_MCS) &&
 530                               (rate->mcs == signal))) {
 531                                 return i;
 532                         }
 533                 }
 534                 break;
 535         case RATE_MODE_HT_MIX:
 536         case RATE_MODE_HT_GREENFIELD:
 537                 if (signal >= 0 && signal <= 76)
 538                         return signal;
 539                 break;
 540         default:
 541                 break;
 542         }
 543
 544         WARNING(rt2x00dev, "Frame received with unrecognized signal, "
 545                 "mode=0x%.4x, signal=0x%.4x, type=%d.\n",
 546                 rxdesc->rate_mode, signal, type);
 547         return 0;
 548 }
 549
 550 void rt2x00lib_rxdone(struct queue_entry *entry)
 551 {
 552         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 553         struct rxdone_entry_desc rxdesc;
 554         struct sk_buff *skb;
 555         struct ieee80211_rx_status *rx_status;
 556         unsigned int header_length;
 557         int rate_idx;
 558
 559         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 560             !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 561                 goto submit_entry;
 562
 563         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 564                 goto submit_entry;
 565
 566         /*
 567          * Allocate a new sk_buffer. If no new buffer available, drop the
 568          * received frame and reuse the existing buffer.
 569          */
 570         skb = rt2x00queue_alloc_rxskb(entry);
 571         if (!skb)
 572                 goto submit_entry;
 573
 574         /*
 575          * Unmap the skb.
 576          */
 577         rt2x00queue_unmap_skb(entry);
 578
 579         /*
 580          * Extract the RXD details.
 581          */
 582         memset(&rxdesc, 0, sizeof(rxdesc));
 583         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 584
 585         /*
 586          * Check for valid size in case we get corrupted descriptor from
 587          * hardware.
 588          */
 589         if (unlikely(rxdesc.size == 0 ||
 590                      rxdesc.size > entry->queue->data_size)) {
 591                 WARNING(rt2x00dev, "Wrong frame size %d max %d.\n",
 592                         rxdesc.size, entry->queue->data_size);
 593                 dev_kfree_skb(entry->skb);
 594                 goto renew_skb;
 595         }
 596
 597         /*
 598          * The data behind the ieee80211 header must be
 599          * aligned on a 4 byte boundary.
 600          */
 601         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 602
 603         /*
 604          * Hardware might have stripped the IV/EIV/ICV data,
 605          * in that case it is possible that the data was
 606          * provided separately (through hardware descriptor)
 607          * in which case we should reinsert the data into the frame.
 608          */
 609         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 610             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 611                 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
 612                                           &rxdesc);
 613         else if (header_length &&
 614                  (rxdesc.size > header_length) &&
 615                  (rxdesc.dev_flags & RXDONE_L2PAD))
 616                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 617
 618         /* Trim buffer to correct size */
 619         skb_trim(entry->skb, rxdesc.size);
 620
 621         /*
 622          * Translate the signal to the correct bitrate index.
 623          */
 624         rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 625         if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
 626             rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
 627                 rxdesc.flags |= RX_FLAG_HT;
 628
 629         /*
 630          * Check if this is a beacon, and more frames have been
 631          * buffered while we were in powersaving mode.
 632          */
 633         rt2x00lib_rxdone_check_ps(rt2x00dev, entry->skb, &rxdesc);
 634
 635         /*
 636          * Update extra components
 637          */
 638         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 639         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 640         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 641
 642         /*
 643          * Initialize RX status information, and send frame
 644          * to mac80211.
 645          */
 646         rx_status = IEEE80211_SKB_RXCB(entry->skb);
 647         rx_status->mactime = rxdesc.timestamp;
 648         rx_status->band = rt2x00dev->curr_band;
 649         rx_status->freq = rt2x00dev->curr_freq;
 650         rx_status->rate_idx = rate_idx;
 651         rx_status->signal = rxdesc.rssi;
 652         rx_status->flag = rxdesc.flags;
 653         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 654
 655         ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
 656
 657 renew_skb:
 658         /*
 659          * Replace the skb with the freshly allocated one.
 660          */
 661         entry->skb = skb;
 662
 663 submit_entry:
 664         entry->flags = 0;
 665         rt2x00queue_index_inc(entry, Q_INDEX_DONE);
 666         if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
 667             test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 668                 rt2x00dev->ops->lib->clear_entry(entry);
 669 }
 670 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 671
 672 /*
 673  * Driver initialization handlers.
 674  */
 675 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 676         {
 677                 .flags = DEV_RATE_CCK,
 678                 .bitrate = 10,
 679                 .ratemask = BIT(0),
 680                 .plcp = 0x00,
 681                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 682         },
 683         {
 684                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 685                 .bitrate = 20,
 686                 .ratemask = BIT(1),
 687                 .plcp = 0x01,
 688                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 689         },
 690         {
 691                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 692                 .bitrate = 55,
 693                 .ratemask = BIT(2),
 694                 .plcp = 0x02,
 695                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 696         },
 697         {
 698                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 699                 .bitrate = 110,
 700                 .ratemask = BIT(3),
 701                 .plcp = 0x03,
 702                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 703         },
 704         {
 705                 .flags = DEV_RATE_OFDM,
 706                 .bitrate = 60,
 707                 .ratemask = BIT(4),
 708                 .plcp = 0x0b,
 709                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 710         },
 711         {
 712                 .flags = DEV_RATE_OFDM,
 713                 .bitrate = 90,
 714                 .ratemask = BIT(5),
 715                 .plcp = 0x0f,
 716                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 717         },
 718         {
 719                 .flags = DEV_RATE_OFDM,
 720                 .bitrate = 120,
 721                 .ratemask = BIT(6),
 722                 .plcp = 0x0a,
 723                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 724         },
 725         {
 726                 .flags = DEV_RATE_OFDM,
 727                 .bitrate = 180,
 728                 .ratemask = BIT(7),
 729                 .plcp = 0x0e,
 730                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 731         },
 732         {
 733                 .flags = DEV_RATE_OFDM,
 734                 .bitrate = 240,
 735                 .ratemask = BIT(8),
 736                 .plcp = 0x09,
 737                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 738         },
 739         {
 740                 .flags = DEV_RATE_OFDM,
 741                 .bitrate = 360,
 742                 .ratemask = BIT(9),
 743                 .plcp = 0x0d,
 744                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 745         },
 746         {
 747                 .flags = DEV_RATE_OFDM,
 748                 .bitrate = 480,
 749                 .ratemask = BIT(10),
 750                 .plcp = 0x08,
 751                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 752         },
 753         {
 754                 .flags = DEV_RATE_OFDM,
 755                 .bitrate = 540,
 756                 .ratemask = BIT(11),
 757                 .plcp = 0x0c,
 758                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 759         },
 760 };
 761
 762 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 763                               const int channel, const int tx_power,
 764                               const int value)
 765 {
 766         /* XXX: this assumption about the band is wrong for 802.11j */
 767         entry->band = channel <= 14 ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 768         entry->center_freq = ieee80211_channel_to_frequency(channel,
 769                                                             entry->band);
 770         entry->hw_value = value;
 771         entry->max_power = tx_power;
 772         entry->max_antenna_gain = 0xff;
 773 }
 774
 775 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 776                            const u16 index, const struct rt2x00_rate *rate)
 777 {
 778         entry->flags = 0;
 779         entry->bitrate = rate->bitrate;
 780         entry->hw_value = index;
 781         entry->hw_value_short = index;
 782
 783         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 784                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 785 }
 786
 787 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 788                                     struct hw_mode_spec *spec)
 789 {
 790         struct ieee80211_hw *hw = rt2x00dev->hw;
 791         struct ieee80211_channel *channels;
 792         struct ieee80211_rate *rates;
 793         unsigned int num_rates;
 794         unsigned int i;
 795
 796         num_rates = 0;
 797         if (spec->supported_rates & SUPPORT_RATE_CCK)
 798                 num_rates += 4;
 799         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 800                 num_rates += 8;
 801
 802         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 803         if (!channels)
 804                 return -ENOMEM;
 805
 806         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 807         if (!rates)
 808                 goto exit_free_channels;
 809
 810         /*
 811          * Initialize Rate list.
 812          */
 813         for (i = 0; i < num_rates; i++)
 814                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 815
 816         /*
 817          * Initialize Channel list.
 818          */
 819         for (i = 0; i < spec->num_channels; i++) {
 820                 rt2x00lib_channel(&channels[i],
 821                                   spec->channels[i].channel,
 822                                   spec->channels_info[i].max_power, i);
 823         }
 824
 825         /*
 826          * Intitialize 802.11b, 802.11g
 827          * Rates: CCK, OFDM.
 828          * Channels: 2.4 GHz
 829          */
 830         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 831                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 832                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 833                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 834                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 835                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 836                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 837                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
 838                        &spec->ht, sizeof(spec->ht));
 839         }
 840
 841         /*
 842          * Intitialize 802.11a
 843          * Rates: OFDM.
 844          * Channels: OFDM, UNII, HiperLAN2.
 845          */
 846         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 847                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 848                     spec->num_channels - 14;
 849                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 850                     num_rates - 4;
 851                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 852                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 853                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 854                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 855                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
 856                        &spec->ht, sizeof(spec->ht));
 857         }
 858
 859         return 0;
 860
 861  exit_free_channels:
 862         kfree(channels);
 863         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 864         return -ENOMEM;
 865 }
 866
 867 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 868 {
 869         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 870                 ieee80211_unregister_hw(rt2x00dev->hw);
 871
 872         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 873                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 874                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 875                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 876                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 877         }
 878
 879         kfree(rt2x00dev->spec.channels_info);
 880 }
 881
 882 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 883 {
 884         struct hw_mode_spec *spec = &rt2x00dev->spec;
 885         int status;
 886
 887         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 888                 return 0;
 889
 890         /*
 891          * Initialize HW modes.
 892          */
 893         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 894         if (status)
 895                 return status;
 896
 897         /*
 898          * Initialize HW fields.
 899          */
 900         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 901
 902         /*
 903          * Initialize extra TX headroom required.
 904          */
 905         rt2x00dev->hw->extra_tx_headroom =
 906                 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
 907                       rt2x00dev->ops->extra_tx_headroom);
 908
 909         /*
 910          * Take TX headroom required for alignment into account.
 911          */
 912         if (test_bit(REQUIRE_L2PAD, &rt2x00dev->cap_flags))
 913                 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
 914         else if (test_bit(REQUIRE_DMA, &rt2x00dev->cap_flags))
 915                 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
 916
 917         /*
 918          * Allocate tx status FIFO for driver use.
 919          */
 920         if (test_bit(REQUIRE_TXSTATUS_FIFO, &rt2x00dev->cap_flags)) {
 921                 /*
 922                  * Allocate the txstatus fifo. In the worst case the tx
 923                  * status fifo has to hold the tx status of all entries
 924                  * in all tx queues. Hence, calculate the kfifo size as
 925                  * tx_queues * entry_num and round up to the nearest
 926                  * power of 2.
 927                  */
 928                 int kfifo_size =
 929                         roundup_pow_of_two(rt2x00dev->ops->tx_queues *
 930                                            rt2x00dev->ops->tx->entry_num *
 931                                            sizeof(u32));
 932
 933                 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, kfifo_size,
 934                                      GFP_KERNEL);
 935                 if (status)
 936                         return status;
 937         }
 938
 939         /*
 940          * Initialize tasklets if used by the driver. Tasklets are
 941          * disabled until the interrupts are turned on. The driver
 942          * has to handle that.
 943          */
 944 #define RT2X00_TASKLET_INIT(taskletname) \
 945         if (rt2x00dev->ops->lib->taskletname) { \
 946                 tasklet_init(&rt2x00dev->taskletname, \
 947                              rt2x00dev->ops->lib->taskletname, \
 948                              (unsigned long)rt2x00dev); \
 949         }
 950
 951         RT2X00_TASKLET_INIT(txstatus_tasklet);
 952         RT2X00_TASKLET_INIT(pretbtt_tasklet);
 953         RT2X00_TASKLET_INIT(tbtt_tasklet);
 954         RT2X00_TASKLET_INIT(rxdone_tasklet);
 955         RT2X00_TASKLET_INIT(autowake_tasklet);
 956
 957 #undef RT2X00_TASKLET_INIT
 958
 959         /*
 960          * Register HW.
 961          */
 962         status = ieee80211_register_hw(rt2x00dev->hw);
 963         if (status)
 964                 return status;
 965
 966         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 967
 968         return 0;
 969 }
 970
 971 /*
 972  * Initialization/uninitialization handlers.
 973  */
 974 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 975 {
 976         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 977                 return;
 978
 979         /*
 980          * Unregister extra components.
 981          */
 982         rt2x00rfkill_unregister(rt2x00dev);
 983
 984         /*
 985          * Allow the HW to uninitialize.
 986          */
 987         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 988
 989         /*
 990          * Free allocated queue entries.
 991          */
 992         rt2x00queue_uninitialize(rt2x00dev);
 993 }
 994
 995 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 996 {
 997         int status;
 998
 999         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1000                 return 0;
1001
1002         /*
1003          * Allocate all queue entries.
1004          */
1005         status = rt2x00queue_initialize(rt2x00dev);
1006         if (status)
1007                 return status;
1008
1009         /*
1010          * Initialize the device.
1011          */
1012         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1013         if (status) {
1014                 rt2x00queue_uninitialize(rt2x00dev);
1015                 return status;
1016         }
1017
1018         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
1019
1020         /*
1021          * Register the extra components.
1022          */
1023         rt2x00rfkill_register(rt2x00dev);
1024
1025         return 0;
1026 }
1027
1028 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1029 {
1030         int retval;
1031
1032         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1033                 return 0;
1034
1035         /*
1036          * If this is the first interface which is added,
1037          * we should load the firmware now.
1038          */
1039         retval = rt2x00lib_load_firmware(rt2x00dev);
1040         if (retval)
1041                 return retval;
1042
1043         /*
1044          * Initialize the device.
1045          */
1046         retval = rt2x00lib_initialize(rt2x00dev);
1047         if (retval)
1048                 return retval;
1049
1050         rt2x00dev->intf_ap_count = 0;
1051         rt2x00dev->intf_sta_count = 0;
1052         rt2x00dev->intf_associated = 0;
1053
1054         /* Enable the radio */
1055         retval = rt2x00lib_enable_radio(rt2x00dev);
1056         if (retval)
1057                 return retval;
1058
1059         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
1060
1061         return 0;
1062 }
1063
1064 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1065 {
1066         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1067                 return;
1068
1069         /*
1070          * Perhaps we can add something smarter here,
1071          * but for now just disabling the radio should do.
1072          */
1073         rt2x00lib_disable_radio(rt2x00dev);
1074
1075         rt2x00dev->intf_ap_count = 0;
1076         rt2x00dev->intf_sta_count = 0;
1077         rt2x00dev->intf_associated = 0;
1078 }
1079
1080 /*
1081  * driver allocation handlers.
1082  */
1083 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1084 {
1085         int retval = -ENOMEM;
1086
1087         spin_lock_init(&rt2x00dev->irqmask_lock);
1088         mutex_init(&rt2x00dev->csr_mutex);
1089
1090         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1091
1092         /*
1093          * Make room for rt2x00_intf inside the per-interface
1094          * structure ieee80211_vif.
1095          */
1096         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1097
1098         /*
1099          * Determine which operating modes are supported, all modes
1100          * which require beaconing, depend on the availability of
1101          * beacon entries.
1102          */
1103         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
1104         if (rt2x00dev->ops->bcn->entry_num > 0)
1105                 rt2x00dev->hw->wiphy->interface_modes |=
1106                     BIT(NL80211_IFTYPE_ADHOC) |
1107                     BIT(NL80211_IFTYPE_AP) |
1108                     BIT(NL80211_IFTYPE_MESH_POINT) |
1109                     BIT(NL80211_IFTYPE_WDS);
1110
1111         /*
1112          * Initialize work.
1113          */
1114         rt2x00dev->workqueue =
1115             alloc_ordered_workqueue(wiphy_name(rt2x00dev->hw->wiphy), 0);
1116         if (!rt2x00dev->workqueue) {
1117                 retval = -ENOMEM;
1118                 goto exit;
1119         }
1120
1121         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1122         INIT_DELAYED_WORK(&rt2x00dev->autowakeup_work, rt2x00lib_autowakeup);
1123
1124         /*
1125          * Let the driver probe the device to detect the capabilities.
1126          */
1127         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1128         if (retval) {
1129                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1130                 goto exit;
1131         }
1132
1133         /*
1134          * Allocate queue array.
1135          */
1136         retval = rt2x00queue_allocate(rt2x00dev);
1137         if (retval)
1138                 goto exit;
1139
1140         /*
1141          * Initialize ieee80211 structure.
1142          */
1143         retval = rt2x00lib_probe_hw(rt2x00dev);
1144         if (retval) {
1145                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1146                 goto exit;
1147         }
1148
1149         /*
1150          * Register extra components.
1151          */
1152         rt2x00link_register(rt2x00dev);
1153         rt2x00leds_register(rt2x00dev);
1154         rt2x00debug_register(rt2x00dev);
1155
1156         return 0;
1157
1158 exit:
1159         rt2x00lib_remove_dev(rt2x00dev);
1160
1161         return retval;
1162 }
1163 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1164
1165 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1166 {
1167         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1168
1169         /*
1170          * Disable radio.
1171          */
1172         rt2x00lib_disable_radio(rt2x00dev);
1173
1174         /*
1175          * Stop all work.
1176          */
1177         cancel_work_sync(&rt2x00dev->intf_work);
1178         cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
1179         if (rt2x00_is_usb(rt2x00dev)) {
1180                 del_timer_sync(&rt2x00dev->txstatus_timer);
1181                 cancel_work_sync(&rt2x00dev->rxdone_work);
1182                 cancel_work_sync(&rt2x00dev->txdone_work);
1183         }
1184         destroy_workqueue(rt2x00dev->workqueue);
1185
1186         /*
1187          * Free the tx status fifo.
1188          */
1189         kfifo_free(&rt2x00dev->txstatus_fifo);
1190
1191         /*
1192          * Kill the tx status tasklet.
1193          */
1194         tasklet_kill(&rt2x00dev->txstatus_tasklet);
1195         tasklet_kill(&rt2x00dev->pretbtt_tasklet);
1196         tasklet_kill(&rt2x00dev->tbtt_tasklet);
1197         tasklet_kill(&rt2x00dev->rxdone_tasklet);
1198         tasklet_kill(&rt2x00dev->autowake_tasklet);
1199
1200         /*
1201          * Uninitialize device.
1202          */
1203         rt2x00lib_uninitialize(rt2x00dev);
1204
1205         /*
1206          * Free extra components
1207          */
1208         rt2x00debug_deregister(rt2x00dev);
1209         rt2x00leds_unregister(rt2x00dev);
1210
1211         /*
1212          * Free ieee80211_hw memory.
1213          */
1214         rt2x00lib_remove_hw(rt2x00dev);
1215
1216         /*
1217          * Free firmware image.
1218          */
1219         rt2x00lib_free_firmware(rt2x00dev);
1220
1221         /*
1222          * Free queue structures.
1223          */
1224         rt2x00queue_free(rt2x00dev);
1225 }
1226 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1227
1228 /*
1229  * Device state handlers
1230  */
1231 #ifdef CONFIG_PM
1232 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1233 {
1234         NOTICE(rt2x00dev, "Going to sleep.\n");
1235
1236         /*
1237          * Prevent mac80211 from accessing driver while suspended.
1238          */
1239         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1240                 return 0;
1241
1242         /*
1243          * Cleanup as much as possible.
1244          */
1245         rt2x00lib_uninitialize(rt2x00dev);
1246
1247         /*
1248          * Suspend/disable extra components.
1249          */
1250         rt2x00leds_suspend(rt2x00dev);
1251         rt2x00debug_deregister(rt2x00dev);
1252
1253         /*
1254          * Set device mode to sleep for power management,
1255          * on some hardware this call seems to consistently fail.
1256          * From the specifications it is hard to tell why it fails,
1257          * and if this is a "bad thing".
1258          * Overall it is safe to just ignore the failure and
1259          * continue suspending. The only downside is that the
1260          * device will not be in optimal power save mode, but with
1261          * the radio and the other components already disabled the
1262          * device is as good as disabled.
1263          */
1264         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1265                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1266                         "continue suspending.\n");
1267
1268         return 0;
1269 }
1270 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1271
1272 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1273 {
1274         NOTICE(rt2x00dev, "Waking up.\n");
1275
1276         /*
1277          * Restore/enable extra components.
1278          */
1279         rt2x00debug_register(rt2x00dev);
1280         rt2x00leds_resume(rt2x00dev);
1281
1282         /*
1283          * We are ready again to receive requests from mac80211.
1284          */
1285         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1286
1287         return 0;
1288 }
1289 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1290 #endif /* CONFIG_PM */
1291
1292 /*
1293  * rt2x00lib module information.
1294  */
1295 MODULE_AUTHOR(DRV_PROJECT);
1296 MODULE_VERSION(DRV_VERSION);
1297 MODULE_DESCRIPTION("rt2x00 library");
1298 MODULE_LICENSE("GPL");