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. This has to be
 414          * serialized with rt2x00mac_tx(), otherwise we can wake up queue
 415          * before it was stopped.
 416          */
 417         spin_lock_bh(&entry->queue->tx_lock);
 418         if (!rt2x00queue_threshold(entry->queue))
 419                 rt2x00queue_unpause_queue(entry->queue);
 420         spin_unlock_bh(&entry->queue->tx_lock);
 421 }
 422 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 423
 424 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
 425 {
 426         struct txdone_entry_desc txdesc;
 427
 428         txdesc.flags = 0;
 429         __set_bit(status, &txdesc.flags);
 430         txdesc.retry = 0;
 431
 432         rt2x00lib_txdone(entry, &txdesc);
 433 }
 434 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
 435
 436 static u8 *rt2x00lib_find_ie(u8 *data, unsigned int len, u8 ie)
 437 {
 438         struct ieee80211_mgmt *mgmt = (void *)data;
 439         u8 *pos, *end;
 440
 441         pos = (u8 *)mgmt->u.beacon.variable;
 442         end = data + len;
 443         while (pos < end) {
 444                 if (pos + 2 + pos[1] > end)
 445                         return NULL;
 446
 447                 if (pos[0] == ie)
 448                         return pos;
 449
 450                 pos += 2 + pos[1];
 451         }
 452
 453         return NULL;
 454 }
 455
 456 static void rt2x00lib_sleep(struct work_struct *work)
 457 {
 458         struct rt2x00_dev *rt2x00dev =
 459             container_of(work, struct rt2x00_dev, sleep_work);
 460
 461         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 462                 return;
 463
 464         /*
 465          * Check again is powersaving is enabled, to prevent races from delayed
 466          * work execution.
 467          */
 468         if (!test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 469                 rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf,
 470                                  IEEE80211_CONF_CHANGE_PS);
 471 }
 472
 473 static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev,
 474                                       struct sk_buff *skb,
 475                                       struct rxdone_entry_desc *rxdesc)
 476 {
 477         struct ieee80211_hdr *hdr = (void *) skb->data;
 478         struct ieee80211_tim_ie *tim_ie;
 479         u8 *tim;
 480         u8 tim_len;
 481         bool cam;
 482
 483         /* If this is not a beacon, or if mac80211 has no powersaving
 484          * configured, or if the device is already in powersaving mode
 485          * we can exit now. */
 486         if (likely(!ieee80211_is_beacon(hdr->frame_control) ||
 487                    !(rt2x00dev->hw->conf.flags & IEEE80211_CONF_PS)))
 488                 return;
 489
 490         /* min. beacon length + FCS_LEN */
 491         if (skb->len <= 40 + FCS_LEN)
 492                 return;
 493
 494         /* and only beacons from the associated BSSID, please */
 495         if (!(rxdesc->dev_flags & RXDONE_MY_BSS) ||
 496             !rt2x00dev->aid)
 497                 return;
 498
 499         rt2x00dev->last_beacon = jiffies;
 500
 501         tim = rt2x00lib_find_ie(skb->data, skb->len - FCS_LEN, WLAN_EID_TIM);
 502         if (!tim)
 503                 return;
 504
 505         if (tim[1] < sizeof(*tim_ie))
 506                 return;
 507
 508         tim_len = tim[1];
 509         tim_ie = (struct ieee80211_tim_ie *) &tim[2];
 510
 511         /* Check whenever the PHY can be turned off again. */
 512
 513         /* 1. What about buffered unicast traffic for our AID? */
 514         cam = ieee80211_check_tim(tim_ie, tim_len, rt2x00dev->aid);
 515
 516         /* 2. Maybe the AP wants to send multicast/broadcast data? */
 517         cam |= (tim_ie->bitmap_ctrl & 0x01);
 518
 519         if (!cam && !test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 520                 queue_work(rt2x00dev->workqueue, &rt2x00dev->sleep_work);
 521 }
 522
 523 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 524                                         struct rxdone_entry_desc *rxdesc)
 525 {
 526         struct ieee80211_supported_band *sband;
 527         const struct rt2x00_rate *rate;
 528         unsigned int i;
 529         int signal = rxdesc->signal;
 530         int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 531
 532         switch (rxdesc->rate_mode) {
 533         case RATE_MODE_CCK:
 534         case RATE_MODE_OFDM:
 535                 /*
 536                  * For non-HT rates the MCS value needs to contain the
 537                  * actually used rate modulation (CCK or OFDM).
 538                  */
 539                 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 540                         signal = RATE_MCS(rxdesc->rate_mode, signal);
 541
 542                 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 543                 for (i = 0; i < sband->n_bitrates; i++) {
 544                         rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 545                         if (((type == RXDONE_SIGNAL_PLCP) &&
 546                              (rate->plcp == signal)) ||
 547                             ((type == RXDONE_SIGNAL_BITRATE) &&
 548                               (rate->bitrate == signal)) ||
 549                             ((type == RXDONE_SIGNAL_MCS) &&
 550                               (rate->mcs == signal))) {
 551                                 return i;
 552                         }
 553                 }
 554                 break;
 555         case RATE_MODE_HT_MIX:
 556         case RATE_MODE_HT_GREENFIELD:
 557                 if (signal >= 0 && signal <= 76)
 558                         return signal;
 559                 break;
 560         default:
 561                 break;
 562         }
 563
 564         WARNING(rt2x00dev, "Frame received with unrecognized signal, "
 565                 "mode=0x%.4x, signal=0x%.4x, type=%d.\n",
 566                 rxdesc->rate_mode, signal, type);
 567         return 0;
 568 }
 569
 570 void rt2x00lib_rxdone(struct queue_entry *entry)
 571 {
 572         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 573         struct rxdone_entry_desc rxdesc;
 574         struct sk_buff *skb;
 575         struct ieee80211_rx_status *rx_status;
 576         unsigned int header_length;
 577         int rate_idx;
 578
 579         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 580             !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 581                 goto submit_entry;
 582
 583         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 584                 goto submit_entry;
 585
 586         /*
 587          * Allocate a new sk_buffer. If no new buffer available, drop the
 588          * received frame and reuse the existing buffer.
 589          */
 590         skb = rt2x00queue_alloc_rxskb(entry);
 591         if (!skb)
 592                 goto submit_entry;
 593
 594         /*
 595          * Unmap the skb.
 596          */
 597         rt2x00queue_unmap_skb(entry);
 598
 599         /*
 600          * Extract the RXD details.
 601          */
 602         memset(&rxdesc, 0, sizeof(rxdesc));
 603         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 604
 605         /*
 606          * The data behind the ieee80211 header must be
 607          * aligned on a 4 byte boundary.
 608          */
 609         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 610
 611         /*
 612          * Hardware might have stripped the IV/EIV/ICV data,
 613          * in that case it is possible that the data was
 614          * provided separately (through hardware descriptor)
 615          * in which case we should reinsert the data into the frame.
 616          */
 617         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 618             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 619                 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
 620                                           &rxdesc);
 621         else if (header_length &&
 622                  (rxdesc.size > header_length) &&
 623                  (rxdesc.dev_flags & RXDONE_L2PAD))
 624                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 625
 626         /* Trim buffer to correct size */
 627         skb_trim(entry->skb, rxdesc.size);
 628
 629         /*
 630          * Translate the signal to the correct bitrate index.
 631          */
 632         rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 633         if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
 634             rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
 635                 rxdesc.flags |= RX_FLAG_HT;
 636
 637         /*
 638          * Check if this is a beacon, and more frames have been
 639          * buffered while we were in powersaving mode.
 640          */
 641         rt2x00lib_rxdone_check_ps(rt2x00dev, entry->skb, &rxdesc);
 642
 643         /*
 644          * Update extra components
 645          */
 646         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 647         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 648         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 649
 650         /*
 651          * Initialize RX status information, and send frame
 652          * to mac80211.
 653          */
 654         rx_status = IEEE80211_SKB_RXCB(entry->skb);
 655         rx_status->mactime = rxdesc.timestamp;
 656         rx_status->band = rt2x00dev->curr_band;
 657         rx_status->freq = rt2x00dev->curr_freq;
 658         rx_status->rate_idx = rate_idx;
 659         rx_status->signal = rxdesc.rssi;
 660         rx_status->flag = rxdesc.flags;
 661         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 662
 663         ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
 664
 665         /*
 666          * Replace the skb with the freshly allocated one.
 667          */
 668         entry->skb = skb;
 669
 670 submit_entry:
 671         entry->flags = 0;
 672         rt2x00queue_index_inc(entry, Q_INDEX_DONE);
 673         if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
 674             test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 675                 rt2x00dev->ops->lib->clear_entry(entry);
 676 }
 677 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 678
 679 /*
 680  * Driver initialization handlers.
 681  */
 682 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 683         {
 684                 .flags = DEV_RATE_CCK,
 685                 .bitrate = 10,
 686                 .ratemask = BIT(0),
 687                 .plcp = 0x00,
 688                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 689         },
 690         {
 691                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 692                 .bitrate = 20,
 693                 .ratemask = BIT(1),
 694                 .plcp = 0x01,
 695                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 696         },
 697         {
 698                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 699                 .bitrate = 55,
 700                 .ratemask = BIT(2),
 701                 .plcp = 0x02,
 702                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 703         },
 704         {
 705                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 706                 .bitrate = 110,
 707                 .ratemask = BIT(3),
 708                 .plcp = 0x03,
 709                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 710         },
 711         {
 712                 .flags = DEV_RATE_OFDM,
 713                 .bitrate = 60,
 714                 .ratemask = BIT(4),
 715                 .plcp = 0x0b,
 716                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 717         },
 718         {
 719                 .flags = DEV_RATE_OFDM,
 720                 .bitrate = 90,
 721                 .ratemask = BIT(5),
 722                 .plcp = 0x0f,
 723                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 724         },
 725         {
 726                 .flags = DEV_RATE_OFDM,
 727                 .bitrate = 120,
 728                 .ratemask = BIT(6),
 729                 .plcp = 0x0a,
 730                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 731         },
 732         {
 733                 .flags = DEV_RATE_OFDM,
 734                 .bitrate = 180,
 735                 .ratemask = BIT(7),
 736                 .plcp = 0x0e,
 737                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 738         },
 739         {
 740                 .flags = DEV_RATE_OFDM,
 741                 .bitrate = 240,
 742                 .ratemask = BIT(8),
 743                 .plcp = 0x09,
 744                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 745         },
 746         {
 747                 .flags = DEV_RATE_OFDM,
 748                 .bitrate = 360,
 749                 .ratemask = BIT(9),
 750                 .plcp = 0x0d,
 751                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 752         },
 753         {
 754                 .flags = DEV_RATE_OFDM,
 755                 .bitrate = 480,
 756                 .ratemask = BIT(10),
 757                 .plcp = 0x08,
 758                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 759         },
 760         {
 761                 .flags = DEV_RATE_OFDM,
 762                 .bitrate = 540,
 763                 .ratemask = BIT(11),
 764                 .plcp = 0x0c,
 765                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 766         },
 767 };
 768
 769 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 770                               const int channel, const int tx_power,
 771                               const int value)
 772 {
 773         /* XXX: this assumption about the band is wrong for 802.11j */
 774         entry->band = channel <= 14 ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 775         entry->center_freq = ieee80211_channel_to_frequency(channel,
 776                                                             entry->band);
 777         entry->hw_value = value;
 778         entry->max_power = tx_power;
 779         entry->max_antenna_gain = 0xff;
 780 }
 781
 782 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 783                            const u16 index, const struct rt2x00_rate *rate)
 784 {
 785         entry->flags = 0;
 786         entry->bitrate = rate->bitrate;
 787         entry->hw_value = index;
 788         entry->hw_value_short = index;
 789
 790         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 791                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 792 }
 793
 794 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 795                                     struct hw_mode_spec *spec)
 796 {
 797         struct ieee80211_hw *hw = rt2x00dev->hw;
 798         struct ieee80211_channel *channels;
 799         struct ieee80211_rate *rates;
 800         unsigned int num_rates;
 801         unsigned int i;
 802
 803         num_rates = 0;
 804         if (spec->supported_rates & SUPPORT_RATE_CCK)
 805                 num_rates += 4;
 806         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 807                 num_rates += 8;
 808
 809         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 810         if (!channels)
 811                 return -ENOMEM;
 812
 813         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 814         if (!rates)
 815                 goto exit_free_channels;
 816
 817         /*
 818          * Initialize Rate list.
 819          */
 820         for (i = 0; i < num_rates; i++)
 821                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 822
 823         /*
 824          * Initialize Channel list.
 825          */
 826         for (i = 0; i < spec->num_channels; i++) {
 827                 rt2x00lib_channel(&channels[i],
 828                                   spec->channels[i].channel,
 829                                   spec->channels_info[i].max_power, i);
 830         }
 831
 832         /*
 833          * Intitialize 802.11b, 802.11g
 834          * Rates: CCK, OFDM.
 835          * Channels: 2.4 GHz
 836          */
 837         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 838                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 839                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 840                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 841                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 842                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 843                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 844                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
 845                        &spec->ht, sizeof(spec->ht));
 846         }
 847
 848         /*
 849          * Intitialize 802.11a
 850          * Rates: OFDM.
 851          * Channels: OFDM, UNII, HiperLAN2.
 852          */
 853         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 854                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 855                     spec->num_channels - 14;
 856                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 857                     num_rates - 4;
 858                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 859                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 860                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 861                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 862                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
 863                        &spec->ht, sizeof(spec->ht));
 864         }
 865
 866         return 0;
 867
 868  exit_free_channels:
 869         kfree(channels);
 870         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 871         return -ENOMEM;
 872 }
 873
 874 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 875 {
 876         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 877                 ieee80211_unregister_hw(rt2x00dev->hw);
 878
 879         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 880                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 881                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 882                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 883                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 884         }
 885
 886         kfree(rt2x00dev->spec.channels_info);
 887 }
 888
 889 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 890 {
 891         struct hw_mode_spec *spec = &rt2x00dev->spec;
 892         int status;
 893
 894         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 895                 return 0;
 896
 897         /*
 898          * Initialize HW modes.
 899          */
 900         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 901         if (status)
 902                 return status;
 903
 904         /*
 905          * Initialize HW fields.
 906          */
 907         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 908
 909         /*
 910          * Initialize extra TX headroom required.
 911          */
 912         rt2x00dev->hw->extra_tx_headroom =
 913                 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
 914                       rt2x00dev->ops->extra_tx_headroom);
 915
 916         /*
 917          * Take TX headroom required for alignment into account.
 918          */
 919         if (test_bit(REQUIRE_L2PAD, &rt2x00dev->cap_flags))
 920                 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
 921         else if (test_bit(REQUIRE_DMA, &rt2x00dev->cap_flags))
 922                 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
 923
 924         /*
 925          * Allocate tx status FIFO for driver use.
 926          */
 927         if (test_bit(REQUIRE_TXSTATUS_FIFO, &rt2x00dev->cap_flags)) {
 928                 /*
 929                  * Allocate the txstatus fifo. In the worst case the tx
 930                  * status fifo has to hold the tx status of all entries
 931                  * in all tx queues. Hence, calculate the kfifo size as
 932                  * tx_queues * entry_num and round up to the nearest
 933                  * power of 2.
 934                  */
 935                 int kfifo_size =
 936                         roundup_pow_of_two(rt2x00dev->ops->tx_queues *
 937                                            rt2x00dev->ops->tx->entry_num *
 938                                            sizeof(u32));
 939
 940                 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, kfifo_size,
 941                                      GFP_KERNEL);
 942                 if (status)
 943                         return status;
 944         }
 945
 946         /*
 947          * Initialize tasklets if used by the driver. Tasklets are
 948          * disabled until the interrupts are turned on. The driver
 949          * has to handle that.
 950          */
 951 #define RT2X00_TASKLET_INIT(taskletname) \
 952         if (rt2x00dev->ops->lib->taskletname) { \
 953                 tasklet_init(&rt2x00dev->taskletname, \
 954                              rt2x00dev->ops->lib->taskletname, \
 955                              (unsigned long)rt2x00dev); \
 956                 tasklet_disable(&rt2x00dev->taskletname); \
 957         }
 958
 959         RT2X00_TASKLET_INIT(txstatus_tasklet);
 960         RT2X00_TASKLET_INIT(pretbtt_tasklet);
 961         RT2X00_TASKLET_INIT(tbtt_tasklet);
 962         RT2X00_TASKLET_INIT(rxdone_tasklet);
 963         RT2X00_TASKLET_INIT(autowake_tasklet);
 964
 965 #undef RT2X00_TASKLET_INIT
 966
 967         /*
 968          * Register HW.
 969          */
 970         status = ieee80211_register_hw(rt2x00dev->hw);
 971         if (status)
 972                 return status;
 973
 974         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 975
 976         return 0;
 977 }
 978
 979 /*
 980  * Initialization/uninitialization handlers.
 981  */
 982 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 983 {
 984         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 985                 return;
 986
 987         /*
 988          * Unregister extra components.
 989          */
 990         rt2x00rfkill_unregister(rt2x00dev);
 991
 992         /*
 993          * Allow the HW to uninitialize.
 994          */
 995         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 996
 997         /*
 998          * Free allocated queue entries.
 999          */
1000         rt2x00queue_uninitialize(rt2x00dev);
1001 }
1002
1003 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1004 {
1005         int status;
1006
1007         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1008                 return 0;
1009
1010         /*
1011          * Allocate all queue entries.
1012          */
1013         status = rt2x00queue_initialize(rt2x00dev);
1014         if (status)
1015                 return status;
1016
1017         /*
1018          * Initialize the device.
1019          */
1020         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1021         if (status) {
1022                 rt2x00queue_uninitialize(rt2x00dev);
1023                 return status;
1024         }
1025
1026         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
1027
1028         /*
1029          * Register the extra components.
1030          */
1031         rt2x00rfkill_register(rt2x00dev);
1032
1033         return 0;
1034 }
1035
1036 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1037 {
1038         int retval;
1039
1040         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1041                 return 0;
1042
1043         /*
1044          * If this is the first interface which is added,
1045          * we should load the firmware now.
1046          */
1047         retval = rt2x00lib_load_firmware(rt2x00dev);
1048         if (retval)
1049                 return retval;
1050
1051         /*
1052          * Initialize the device.
1053          */
1054         retval = rt2x00lib_initialize(rt2x00dev);
1055         if (retval)
1056                 return retval;
1057
1058         rt2x00dev->intf_ap_count = 0;
1059         rt2x00dev->intf_sta_count = 0;
1060         rt2x00dev->intf_associated = 0;
1061
1062         /* Enable the radio */
1063         retval = rt2x00lib_enable_radio(rt2x00dev);
1064         if (retval)
1065                 return retval;
1066
1067         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
1068
1069         return 0;
1070 }
1071
1072 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1073 {
1074         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1075                 return;
1076
1077         /*
1078          * Perhaps we can add something smarter here,
1079          * but for now just disabling the radio should do.
1080          */
1081         rt2x00lib_disable_radio(rt2x00dev);
1082
1083         rt2x00dev->intf_ap_count = 0;
1084         rt2x00dev->intf_sta_count = 0;
1085         rt2x00dev->intf_associated = 0;
1086 }
1087
1088 /*
1089  * driver allocation handlers.
1090  */
1091 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1092 {
1093         int retval = -ENOMEM;
1094
1095         spin_lock_init(&rt2x00dev->irqmask_lock);
1096         mutex_init(&rt2x00dev->csr_mutex);
1097
1098         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1099
1100         /*
1101          * Make room for rt2x00_intf inside the per-interface
1102          * structure ieee80211_vif.
1103          */
1104         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1105
1106         /*
1107          * Determine which operating modes are supported, all modes
1108          * which require beaconing, depend on the availability of
1109          * beacon entries.
1110          */
1111         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
1112         if (rt2x00dev->ops->bcn->entry_num > 0)
1113                 rt2x00dev->hw->wiphy->interface_modes |=
1114                     BIT(NL80211_IFTYPE_ADHOC) |
1115                     BIT(NL80211_IFTYPE_AP) |
1116                     BIT(NL80211_IFTYPE_MESH_POINT) |
1117                     BIT(NL80211_IFTYPE_WDS);
1118
1119         /*
1120          * Initialize work.
1121          */
1122         rt2x00dev->workqueue =
1123             alloc_ordered_workqueue(wiphy_name(rt2x00dev->hw->wiphy), 0);
1124         if (!rt2x00dev->workqueue) {
1125                 retval = -ENOMEM;
1126                 goto exit;
1127         }
1128
1129         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1130         INIT_DELAYED_WORK(&rt2x00dev->autowakeup_work, rt2x00lib_autowakeup);
1131         INIT_WORK(&rt2x00dev->sleep_work, rt2x00lib_sleep);
1132
1133         /*
1134          * Let the driver probe the device to detect the capabilities.
1135          */
1136         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1137         if (retval) {
1138                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1139                 goto exit;
1140         }
1141
1142         /*
1143          * Allocate queue array.
1144          */
1145         retval = rt2x00queue_allocate(rt2x00dev);
1146         if (retval)
1147                 goto exit;
1148
1149         /*
1150          * Initialize ieee80211 structure.
1151          */
1152         retval = rt2x00lib_probe_hw(rt2x00dev);
1153         if (retval) {
1154                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1155                 goto exit;
1156         }
1157
1158         /*
1159          * Register extra components.
1160          */
1161         rt2x00link_register(rt2x00dev);
1162         rt2x00leds_register(rt2x00dev);
1163         rt2x00debug_register(rt2x00dev);
1164
1165         return 0;
1166
1167 exit:
1168         rt2x00lib_remove_dev(rt2x00dev);
1169
1170         return retval;
1171 }
1172 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1173
1174 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1175 {
1176         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1177
1178         /*
1179          * Disable radio.
1180          */
1181         rt2x00lib_disable_radio(rt2x00dev);
1182
1183         /*
1184          * Stop all work.
1185          */
1186         cancel_work_sync(&rt2x00dev->intf_work);
1187         cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
1188         cancel_work_sync(&rt2x00dev->sleep_work);
1189         if (rt2x00_is_usb(rt2x00dev)) {
1190                 del_timer_sync(&rt2x00dev->txstatus_timer);
1191                 cancel_work_sync(&rt2x00dev->rxdone_work);
1192                 cancel_work_sync(&rt2x00dev->txdone_work);
1193         }
1194         destroy_workqueue(rt2x00dev->workqueue);
1195
1196         /*
1197          * Free the tx status fifo.
1198          */
1199         kfifo_free(&rt2x00dev->txstatus_fifo);
1200
1201         /*
1202          * Kill the tx status tasklet.
1203          */
1204         tasklet_kill(&rt2x00dev->txstatus_tasklet);
1205         tasklet_kill(&rt2x00dev->pretbtt_tasklet);
1206         tasklet_kill(&rt2x00dev->tbtt_tasklet);
1207         tasklet_kill(&rt2x00dev->rxdone_tasklet);
1208         tasklet_kill(&rt2x00dev->autowake_tasklet);
1209
1210         /*
1211          * Uninitialize device.
1212          */
1213         rt2x00lib_uninitialize(rt2x00dev);
1214
1215         /*
1216          * Free extra components
1217          */
1218         rt2x00debug_deregister(rt2x00dev);
1219         rt2x00leds_unregister(rt2x00dev);
1220
1221         /*
1222          * Free ieee80211_hw memory.
1223          */
1224         rt2x00lib_remove_hw(rt2x00dev);
1225
1226         /*
1227          * Free firmware image.
1228          */
1229         rt2x00lib_free_firmware(rt2x00dev);
1230
1231         /*
1232          * Free queue structures.
1233          */
1234         rt2x00queue_free(rt2x00dev);
1235 }
1236 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1237
1238 /*
1239  * Device state handlers
1240  */
1241 #ifdef CONFIG_PM
1242 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1243 {
1244         NOTICE(rt2x00dev, "Going to sleep.\n");
1245
1246         /*
1247          * Prevent mac80211 from accessing driver while suspended.
1248          */
1249         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1250                 return 0;
1251
1252         /*
1253          * Cleanup as much as possible.
1254          */
1255         rt2x00lib_uninitialize(rt2x00dev);
1256
1257         /*
1258          * Suspend/disable extra components.
1259          */
1260         rt2x00leds_suspend(rt2x00dev);
1261         rt2x00debug_deregister(rt2x00dev);
1262
1263         /*
1264          * Set device mode to sleep for power management,
1265          * on some hardware this call seems to consistently fail.
1266          * From the specifications it is hard to tell why it fails,
1267          * and if this is a "bad thing".
1268          * Overall it is safe to just ignore the failure and
1269          * continue suspending. The only downside is that the
1270          * device will not be in optimal power save mode, but with
1271          * the radio and the other components already disabled the
1272          * device is as good as disabled.
1273          */
1274         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1275                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1276                         "continue suspending.\n");
1277
1278         return 0;
1279 }
1280 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1281
1282 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1283 {
1284         NOTICE(rt2x00dev, "Waking up.\n");
1285
1286         /*
1287          * Restore/enable extra components.
1288          */
1289         rt2x00debug_register(rt2x00dev);
1290         rt2x00leds_resume(rt2x00dev);
1291
1292         /*
1293          * We are ready again to receive requests from mac80211.
1294          */
1295         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1296
1297         return 0;
1298 }
1299 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1300 #endif /* CONFIG_PM */
1301
1302 /*
1303  * rt2x00lib module information.
1304  */
1305 MODULE_AUTHOR(DRV_PROJECT);
1306 MODULE_VERSION(DRV_VERSION);
1307 MODULE_DESCRIPTION("rt2x00 library");
1308 MODULE_LICENSE("GPL");