drivers/net/wireless/rt2x00/rt2x00dev.c

   1 /*
   2         Copyright (C) 2010 Willow Garage <http://www.willowgarage.com>
   3         Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
   4         <http://rt2x00.serialmonkey.com>
   5
   6         This program is free software; you can redistribute it and/or modify
   7         it under the terms of the GNU General Public License as published by
   8         the Free Software Foundation; either version 2 of the License, or
   9         (at your option) any later version.
  10
  11         This program is distributed in the hope that it will be useful,
  12         but WITHOUT ANY WARRANTY; without even the implied warranty of
  13         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14         GNU General Public License for more details.
  15
  16         You should have received a copy of the GNU General Public License
  17         along with this program; if not, write to the
  18         Free Software Foundation, Inc.,
  19         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  */
  21
  22 /*
  23         Module: rt2x00lib
  24         Abstract: rt2x00 generic device routines.
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/slab.h>
  30 #include <linux/log2.h>
  31
  32 #include "rt2x00.h"
  33 #include "rt2x00lib.h"
  34
  35 /*
  36  * Utility functions.
  37  */
  38 u32 rt2x00lib_get_bssidx(struct rt2x00_dev *rt2x00dev,
  39                          struct ieee80211_vif *vif)
  40 {
  41         /*
  42          * When in STA mode, bssidx is always 0 otherwise local_address[5]
  43          * contains the bss number, see BSS_ID_MASK comments for details.
  44          */
  45         if (rt2x00dev->intf_sta_count)
  46                 return 0;
  47         return vif->addr[5] & (rt2x00dev->ops->max_ap_intf - 1);
  48 }
  49 EXPORT_SYMBOL_GPL(rt2x00lib_get_bssidx);
  50
  51 /*
  52  * Radio control handlers.
  53  */
  54 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  55 {
  56         int status;
  57
  58         /*
  59          * Don't enable the radio twice.
  60          * And check if the hardware button has been disabled.
  61          */
  62         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  63                 return 0;
  64
  65         /*
  66          * Initialize all data queues.
  67          */
  68         rt2x00queue_init_queues(rt2x00dev);
  69
  70         /*
  71          * Enable radio.
  72          */
  73         status =
  74             rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
  75         if (status)
  76                 return status;
  77
  78         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
  79
  80         rt2x00leds_led_radio(rt2x00dev, true);
  81         rt2x00led_led_activity(rt2x00dev, true);
  82
  83         set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
  84
  85         /*
  86          * Enable queues.
  87          */
  88         rt2x00queue_start_queues(rt2x00dev);
  89         rt2x00link_start_tuner(rt2x00dev);
  90         rt2x00link_start_agc(rt2x00dev);
  91         if (test_bit(CAPABILITY_VCO_RECALIBRATION, &rt2x00dev->cap_flags))
  92                 rt2x00link_start_vcocal(rt2x00dev);
  93
  94         /*
  95          * Start watchdog monitoring.
  96          */
  97         rt2x00link_start_watchdog(rt2x00dev);
  98
  99         return 0;
 100 }
 101
 102 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
 103 {
 104         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 105                 return;
 106
 107         /*
 108          * Stop watchdog monitoring.
 109          */
 110         rt2x00link_stop_watchdog(rt2x00dev);
 111
 112         /*
 113          * Stop all queues
 114          */
 115         rt2x00link_stop_agc(rt2x00dev);
 116         if (test_bit(CAPABILITY_VCO_RECALIBRATION, &rt2x00dev->cap_flags))
 117                 rt2x00link_stop_vcocal(rt2x00dev);
 118         rt2x00link_stop_tuner(rt2x00dev);
 119         rt2x00queue_stop_queues(rt2x00dev);
 120         rt2x00queue_flush_queues(rt2x00dev, true);
 121
 122         /*
 123          * Disable radio.
 124          */
 125         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 126         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 127         rt2x00led_led_activity(rt2x00dev, false);
 128         rt2x00leds_led_radio(rt2x00dev, false);
 129 }
 130
 131 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 132                                           struct ieee80211_vif *vif)
 133 {
 134         struct rt2x00_dev *rt2x00dev = data;
 135         struct rt2x00_intf *intf = vif_to_intf(vif);
 136
 137         /*
 138          * It is possible the radio was disabled while the work had been
 139          * scheduled. If that happens we should return here immediately,
 140          * note that in the spinlock protected area above the delayed_flags
 141          * have been cleared correctly.
 142          */
 143         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 144                 return;
 145
 146         if (test_and_clear_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags))
 147                 rt2x00queue_update_beacon(rt2x00dev, vif);
 148 }
 149
 150 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 151 {
 152         struct rt2x00_dev *rt2x00dev =
 153             container_of(work, struct rt2x00_dev, intf_work);
 154
 155         /*
 156          * Iterate over each interface and perform the
 157          * requested configurations.
 158          */
 159         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 160                                             rt2x00lib_intf_scheduled_iter,
 161                                             rt2x00dev);
 162 }
 163
 164 static void rt2x00lib_autowakeup(struct work_struct *work)
 165 {
 166         struct rt2x00_dev *rt2x00dev =
 167             container_of(work, struct rt2x00_dev, autowakeup_work.work);
 168
 169         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 170                 return;
 171
 172         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_AWAKE))
 173                 ERROR(rt2x00dev, "Device failed to wakeup.\n");
 174         clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
 175 }
 176
 177 /*
 178  * Interrupt context handlers.
 179  */
 180 static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac,
 181                                      struct ieee80211_vif *vif)
 182 {
 183         struct rt2x00_dev *rt2x00dev = data;
 184         struct sk_buff *skb;
 185
 186         /*
 187          * Only AP mode interfaces do broad- and multicast buffering
 188          */
 189         if (vif->type != NL80211_IFTYPE_AP)
 190                 return;
 191
 192         /*
 193          * Send out buffered broad- and multicast frames
 194          */
 195         skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 196         while (skb) {
 197                 rt2x00mac_tx(rt2x00dev->hw, skb);
 198                 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 199         }
 200 }
 201
 202 static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac,
 203                                         struct ieee80211_vif *vif)
 204 {
 205         struct rt2x00_dev *rt2x00dev = data;
 206
 207         if (vif->type != NL80211_IFTYPE_AP &&
 208             vif->type != NL80211_IFTYPE_ADHOC &&
 209             vif->type != NL80211_IFTYPE_MESH_POINT &&
 210             vif->type != NL80211_IFTYPE_WDS)
 211                 return;
 212
 213         /*
 214          * Update the beacon without locking. This is safe on PCI devices
 215          * as they only update the beacon periodically here. This should
 216          * never be called for USB devices.
 217          */
 218         WARN_ON(rt2x00_is_usb(rt2x00dev));
 219         rt2x00queue_update_beacon_locked(rt2x00dev, vif);
 220 }
 221
 222 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 223 {
 224         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 225                 return;
 226
 227         /* send buffered bc/mc frames out for every bssid */
 228         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 229                                                    rt2x00lib_bc_buffer_iter,
 230                                                    rt2x00dev);
 231         /*
 232          * Devices with pre tbtt interrupt don't need to update the beacon
 233          * here as they will fetch the next beacon directly prior to
 234          * transmission.
 235          */
 236         if (test_bit(CAPABILITY_PRE_TBTT_INTERRUPT, &rt2x00dev->cap_flags))
 237                 return;
 238
 239         /* fetch next beacon */
 240         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 241                                                    rt2x00lib_beaconupdate_iter,
 242                                                    rt2x00dev);
 243 }
 244 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 245
 246 void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev)
 247 {
 248         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 249                 return;
 250
 251         /* fetch next beacon */
 252         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 253                                                    rt2x00lib_beaconupdate_iter,
 254                                                    rt2x00dev);
 255 }
 256 EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
 257
 258 void rt2x00lib_dmastart(struct queue_entry *entry)
 259 {
 260         set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 261         rt2x00queue_index_inc(entry, Q_INDEX);
 262 }
 263 EXPORT_SYMBOL_GPL(rt2x00lib_dmastart);
 264
 265 void rt2x00lib_dmadone(struct queue_entry *entry)
 266 {
 267         set_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags);
 268         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 269         rt2x00queue_index_inc(entry, Q_INDEX_DMA_DONE);
 270 }
 271 EXPORT_SYMBOL_GPL(rt2x00lib_dmadone);
 272
 273 void rt2x00lib_txdone(struct queue_entry *entry,
 274                       struct txdone_entry_desc *txdesc)
 275 {
 276         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 277         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 278         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 279         unsigned int header_length, i;
 280         u8 rate_idx, rate_flags, retry_rates;
 281         u8 skbdesc_flags = skbdesc->flags;
 282         bool success;
 283
 284         /*
 285          * Unmap the skb.
 286          */
 287         rt2x00queue_unmap_skb(entry);
 288
 289         /*
 290          * Remove the extra tx headroom from the skb.
 291          */
 292         skb_pull(entry->skb, rt2x00dev->ops->extra_tx_headroom);
 293
 294         /*
 295          * Signal that the TX descriptor is no longer in the skb.
 296          */
 297         skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
 298
 299         /*
 300          * Determine the length of 802.11 header.
 301          */
 302         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 303
 304         /*
 305          * Remove L2 padding which was added during
 306          */
 307         if (test_bit(REQUIRE_L2PAD, &rt2x00dev->cap_flags))
 308                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 309
 310         /*
 311          * If the IV/EIV data was stripped from the frame before it was
 312          * passed to the hardware, we should now reinsert it again because
 313          * mac80211 will expect the same data to be present it the
 314          * frame as it was passed to us.
 315          */
 316         if (test_bit(CAPABILITY_HW_CRYPTO, &rt2x00dev->cap_flags))
 317                 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
 318
 319         /*
 320          * Send frame to debugfs immediately, after this call is completed
 321          * we are going to overwrite the skb->cb array.
 322          */
 323         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 324
 325         /*
 326          * Determine if the frame has been successfully transmitted.
 327          */
 328         success =
 329             test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 330             test_bit(TXDONE_UNKNOWN, &txdesc->flags);
 331
 332         /*
 333          * Update TX statistics.
 334          */
 335         rt2x00dev->link.qual.tx_success += success;
 336         rt2x00dev->link.qual.tx_failed += !success;
 337
 338         rate_idx = skbdesc->tx_rate_idx;
 339         rate_flags = skbdesc->tx_rate_flags;
 340         retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
 341             (txdesc->retry + 1) : 1;
 342
 343         /*
 344          * Initialize TX status
 345          */
 346         memset(&tx_info->status, 0, sizeof(tx_info->status));
 347         tx_info->status.ack_signal = 0;
 348
 349         /*
 350          * Frame was send with retries, hardware tried
 351          * different rates to send out the frame, at each
 352          * retry it lowered the rate 1 step except when the
 353          * lowest rate was used.
 354          */
 355         for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
 356                 tx_info->status.rates[i].idx = rate_idx - i;
 357                 tx_info->status.rates[i].flags = rate_flags;
 358
 359                 if (rate_idx - i == 0) {
 360                         /*
 361                          * The lowest rate (index 0) was used until the
 362                          * number of max retries was reached.
 363                          */
 364                         tx_info->status.rates[i].count = retry_rates - i;
 365                         i++;
 366                         break;
 367                 }
 368                 tx_info->status.rates[i].count = 1;
 369         }
 370         if (i < (IEEE80211_TX_MAX_RATES - 1))
 371                 tx_info->status.rates[i].idx = -1; /* terminate */
 372
 373         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 374                 if (success)
 375                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 376                 else
 377                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 378         }
 379
 380         /*
 381          * Every single frame has it's own tx status, hence report
 382          * every frame as ampdu of size 1.
 383          *
 384          * TODO: if we can find out how many frames were aggregated
 385          * by the hw we could provide the real ampdu_len to mac80211
 386          * which would allow the rc algorithm to better decide on
 387          * which rates are suitable.
 388          */
 389         if (test_bit(TXDONE_AMPDU, &txdesc->flags) ||
 390             tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 391                 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
 392                 tx_info->status.ampdu_len = 1;
 393                 tx_info->status.ampdu_ack_len = success ? 1 : 0;
 394                 /*
 395                  * TODO: Need to tear down BA session here
 396                  * if not successful.
 397                  */
 398         }
 399
 400         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 401                 if (success)
 402                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 403                 else
 404                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 405         }
 406
 407         /*
 408          * Only send the status report to mac80211 when it's a frame
 409          * that originated in mac80211. If this was a extra frame coming
 410          * through a mac80211 library call (RTS/CTS) then we should not
 411          * send the status report back.
 412          */
 413         if (!(skbdesc_flags & SKBDESC_NOT_MAC80211)) {
 414                 if (test_bit(REQUIRE_TASKLET_CONTEXT, &rt2x00dev->cap_flags))
 415                         ieee80211_tx_status(rt2x00dev->hw, entry->skb);
 416                 else
 417                         ieee80211_tx_status_ni(rt2x00dev->hw, entry->skb);
 418         } else
 419                 dev_kfree_skb_any(entry->skb);
 420
 421         /*
 422          * Make this entry available for reuse.
 423          */
 424         entry->skb = NULL;
 425         entry->flags = 0;
 426
 427         rt2x00dev->ops->lib->clear_entry(entry);
 428
 429         rt2x00queue_index_inc(entry, Q_INDEX_DONE);
 430
 431         /*
 432          * If the data queue was below the threshold before the txdone
 433          * handler we must make sure the packet queue in the mac80211 stack
 434          * is reenabled when the txdone handler has finished. This has to be
 435          * serialized with rt2x00mac_tx(), otherwise we can wake up queue
 436          * before it was stopped.
 437          */
 438         spin_lock_bh(&entry->queue->tx_lock);
 439         if (!rt2x00queue_threshold(entry->queue))
 440                 rt2x00queue_unpause_queue(entry->queue);
 441         spin_unlock_bh(&entry->queue->tx_lock);
 442 }
 443 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 444
 445 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
 446 {
 447         struct txdone_entry_desc txdesc;
 448
 449         txdesc.flags = 0;
 450         __set_bit(status, &txdesc.flags);
 451         txdesc.retry = 0;
 452
 453         rt2x00lib_txdone(entry, &txdesc);
 454 }
 455 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
 456
 457 static u8 *rt2x00lib_find_ie(u8 *data, unsigned int len, u8 ie)
 458 {
 459         struct ieee80211_mgmt *mgmt = (void *)data;
 460         u8 *pos, *end;
 461
 462         pos = (u8 *)mgmt->u.beacon.variable;
 463         end = data + len;
 464         while (pos < end) {
 465                 if (pos + 2 + pos[1] > end)
 466                         return NULL;
 467
 468                 if (pos[0] == ie)
 469                         return pos;
 470
 471                 pos += 2 + pos[1];
 472         }
 473
 474         return NULL;
 475 }
 476
 477 static void rt2x00lib_sleep(struct work_struct *work)
 478 {
 479         struct rt2x00_dev *rt2x00dev =
 480             container_of(work, struct rt2x00_dev, sleep_work);
 481
 482         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 483                 return;
 484
 485         /*
 486          * Check again is powersaving is enabled, to prevent races from delayed
 487          * work execution.
 488          */
 489         if (!test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 490                 rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf,
 491                                  IEEE80211_CONF_CHANGE_PS);
 492 }
 493
 494 static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev,
 495                                       struct sk_buff *skb,
 496                                       struct rxdone_entry_desc *rxdesc)
 497 {
 498         struct ieee80211_hdr *hdr = (void *) skb->data;
 499         struct ieee80211_tim_ie *tim_ie;
 500         u8 *tim;
 501         u8 tim_len;
 502         bool cam;
 503
 504         /* If this is not a beacon, or if mac80211 has no powersaving
 505          * configured, or if the device is already in powersaving mode
 506          * we can exit now. */
 507         if (likely(!ieee80211_is_beacon(hdr->frame_control) ||
 508                    !(rt2x00dev->hw->conf.flags & IEEE80211_CONF_PS)))
 509                 return;
 510
 511         /* min. beacon length + FCS_LEN */
 512         if (skb->len <= 40 + FCS_LEN)
 513                 return;
 514
 515         /* and only beacons from the associated BSSID, please */
 516         if (!(rxdesc->dev_flags & RXDONE_MY_BSS) ||
 517             !rt2x00dev->aid)
 518                 return;
 519
 520         rt2x00dev->last_beacon = jiffies;
 521
 522         tim = rt2x00lib_find_ie(skb->data, skb->len - FCS_LEN, WLAN_EID_TIM);
 523         if (!tim)
 524                 return;
 525
 526         if (tim[1] < sizeof(*tim_ie))
 527                 return;
 528
 529         tim_len = tim[1];
 530         tim_ie = (struct ieee80211_tim_ie *) &tim[2];
 531
 532         /* Check whenever the PHY can be turned off again. */
 533
 534         /* 1. What about buffered unicast traffic for our AID? */
 535         cam = ieee80211_check_tim(tim_ie, tim_len, rt2x00dev->aid);
 536
 537         /* 2. Maybe the AP wants to send multicast/broadcast data? */
 538         cam |= (tim_ie->bitmap_ctrl & 0x01);
 539
 540         if (!cam && !test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 541                 queue_work(rt2x00dev->workqueue, &rt2x00dev->sleep_work);
 542 }
 543
 544 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 545                                         struct rxdone_entry_desc *rxdesc)
 546 {
 547         struct ieee80211_supported_band *sband;
 548         const struct rt2x00_rate *rate;
 549         unsigned int i;
 550         int signal = rxdesc->signal;
 551         int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 552
 553         switch (rxdesc->rate_mode) {
 554         case RATE_MODE_CCK:
 555         case RATE_MODE_OFDM:
 556                 /*
 557                  * For non-HT rates the MCS value needs to contain the
 558                  * actually used rate modulation (CCK or OFDM).
 559                  */
 560                 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 561                         signal = RATE_MCS(rxdesc->rate_mode, signal);
 562
 563                 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 564                 for (i = 0; i < sband->n_bitrates; i++) {
 565                         rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 566                         if (((type == RXDONE_SIGNAL_PLCP) &&
 567                              (rate->plcp == signal)) ||
 568                             ((type == RXDONE_SIGNAL_BITRATE) &&
 569                               (rate->bitrate == signal)) ||
 570                             ((type == RXDONE_SIGNAL_MCS) &&
 571                               (rate->mcs == signal))) {
 572                                 return i;
 573                         }
 574                 }
 575                 break;
 576         case RATE_MODE_HT_MIX:
 577         case RATE_MODE_HT_GREENFIELD:
 578                 if (signal >= 0 && signal <= 76)
 579                         return signal;
 580                 break;
 581         default:
 582                 break;
 583         }
 584
 585         WARNING(rt2x00dev, "Frame received with unrecognized signal, "
 586                 "mode=0x%.4x, signal=0x%.4x, type=%d.\n",
 587                 rxdesc->rate_mode, signal, type);
 588         return 0;
 589 }
 590
 591 void rt2x00lib_rxdone(struct queue_entry *entry, gfp_t gfp)
 592 {
 593         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 594         struct rxdone_entry_desc rxdesc;
 595         struct sk_buff *skb;
 596         struct ieee80211_rx_status *rx_status;
 597         unsigned int header_length;
 598         int rate_idx;
 599
 600         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 601             !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 602                 goto submit_entry;
 603
 604         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 605                 goto submit_entry;
 606
 607         /*
 608          * Allocate a new sk_buffer. If no new buffer available, drop the
 609          * received frame and reuse the existing buffer.
 610          */
 611         skb = rt2x00queue_alloc_rxskb(entry, gfp);
 612         if (!skb)
 613                 goto submit_entry;
 614
 615         /*
 616          * Unmap the skb.
 617          */
 618         rt2x00queue_unmap_skb(entry);
 619
 620         /*
 621          * Extract the RXD details.
 622          */
 623         memset(&rxdesc, 0, sizeof(rxdesc));
 624         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 625
 626         /*
 627          * Check for valid size in case we get corrupted descriptor from
 628          * hardware.
 629          */
 630         if (unlikely(rxdesc.size == 0 ||
 631                      rxdesc.size > entry->queue->data_size)) {
 632                 WARNING(rt2x00dev, "Wrong frame size %d max %d.\n",
 633                         rxdesc.size, entry->queue->data_size);
 634                 dev_kfree_skb(entry->skb);
 635                 goto renew_skb;
 636         }
 637
 638         /*
 639          * The data behind the ieee80211 header must be
 640          * aligned on a 4 byte boundary.
 641          */
 642         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 643
 644         /*
 645          * Hardware might have stripped the IV/EIV/ICV data,
 646          * in that case it is possible that the data was
 647          * provided separately (through hardware descriptor)
 648          * in which case we should reinsert the data into the frame.
 649          */
 650         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 651             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 652                 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
 653                                           &rxdesc);
 654         else if (header_length &&
 655                  (rxdesc.size > header_length) &&
 656                  (rxdesc.dev_flags & RXDONE_L2PAD))
 657                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 658
 659         /* Trim buffer to correct size */
 660         skb_trim(entry->skb, rxdesc.size);
 661
 662         /*
 663          * Translate the signal to the correct bitrate index.
 664          */
 665         rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 666         if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
 667             rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
 668                 rxdesc.flags |= RX_FLAG_HT;
 669
 670         /*
 671          * Check if this is a beacon, and more frames have been
 672          * buffered while we were in powersaving mode.
 673          */
 674         rt2x00lib_rxdone_check_ps(rt2x00dev, entry->skb, &rxdesc);
 675
 676         /*
 677          * Update extra components
 678          */
 679         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 680         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 681         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 682
 683         /*
 684          * Initialize RX status information, and send frame
 685          * to mac80211.
 686          */
 687         rx_status = IEEE80211_SKB_RXCB(entry->skb);
 688         rx_status->mactime = rxdesc.timestamp;
 689         rx_status->band = rt2x00dev->curr_band;
 690         rx_status->freq = rt2x00dev->curr_freq;
 691         rx_status->rate_idx = rate_idx;
 692         rx_status->signal = rxdesc.rssi;
 693         rx_status->flag = rxdesc.flags;
 694         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 695
 696         ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
 697
 698 renew_skb:
 699         /*
 700          * Replace the skb with the freshly allocated one.
 701          */
 702         entry->skb = skb;
 703
 704 submit_entry:
 705         entry->flags = 0;
 706         rt2x00queue_index_inc(entry, Q_INDEX_DONE);
 707         if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
 708             test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 709                 rt2x00dev->ops->lib->clear_entry(entry);
 710 }
 711 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 712
 713 /*
 714  * Driver initialization handlers.
 715  */
 716 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 717         {
 718                 .flags = DEV_RATE_CCK,
 719                 .bitrate = 10,
 720                 .ratemask = BIT(0),
 721                 .plcp = 0x00,
 722                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 723         },
 724         {
 725                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 726                 .bitrate = 20,
 727                 .ratemask = BIT(1),
 728                 .plcp = 0x01,
 729                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 730         },
 731         {
 732                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 733                 .bitrate = 55,
 734                 .ratemask = BIT(2),
 735                 .plcp = 0x02,
 736                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 737         },
 738         {
 739                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 740                 .bitrate = 110,
 741                 .ratemask = BIT(3),
 742                 .plcp = 0x03,
 743                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 744         },
 745         {
 746                 .flags = DEV_RATE_OFDM,
 747                 .bitrate = 60,
 748                 .ratemask = BIT(4),
 749                 .plcp = 0x0b,
 750                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 751         },
 752         {
 753                 .flags = DEV_RATE_OFDM,
 754                 .bitrate = 90,
 755                 .ratemask = BIT(5),
 756                 .plcp = 0x0f,
 757                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 758         },
 759         {
 760                 .flags = DEV_RATE_OFDM,
 761                 .bitrate = 120,
 762                 .ratemask = BIT(6),
 763                 .plcp = 0x0a,
 764                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 765         },
 766         {
 767                 .flags = DEV_RATE_OFDM,
 768                 .bitrate = 180,
 769                 .ratemask = BIT(7),
 770                 .plcp = 0x0e,
 771                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 772         },
 773         {
 774                 .flags = DEV_RATE_OFDM,
 775                 .bitrate = 240,
 776                 .ratemask = BIT(8),
 777                 .plcp = 0x09,
 778                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 779         },
 780         {
 781                 .flags = DEV_RATE_OFDM,
 782                 .bitrate = 360,
 783                 .ratemask = BIT(9),
 784                 .plcp = 0x0d,
 785                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 786         },
 787         {
 788                 .flags = DEV_RATE_OFDM,
 789                 .bitrate = 480,
 790                 .ratemask = BIT(10),
 791                 .plcp = 0x08,
 792                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 793         },
 794         {
 795                 .flags = DEV_RATE_OFDM,
 796                 .bitrate = 540,
 797                 .ratemask = BIT(11),
 798                 .plcp = 0x0c,
 799                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 800         },
 801 };
 802
 803 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 804                               const int channel, const int tx_power,
 805                               const int value)
 806 {
 807         /* XXX: this assumption about the band is wrong for 802.11j */
 808         entry->band = channel <= 14 ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 809         entry->center_freq = ieee80211_channel_to_frequency(channel,
 810                                                             entry->band);
 811         entry->hw_value = value;
 812         entry->max_power = tx_power;
 813         entry->max_antenna_gain = 0xff;
 814 }
 815
 816 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 817                            const u16 index, const struct rt2x00_rate *rate)
 818 {
 819         entry->flags = 0;
 820         entry->bitrate = rate->bitrate;
 821         entry->hw_value = index;
 822         entry->hw_value_short = index;
 823
 824         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 825                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 826 }
 827
 828 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 829                                     struct hw_mode_spec *spec)
 830 {
 831         struct ieee80211_hw *hw = rt2x00dev->hw;
 832         struct ieee80211_channel *channels;
 833         struct ieee80211_rate *rates;
 834         unsigned int num_rates;
 835         unsigned int i;
 836
 837         num_rates = 0;
 838         if (spec->supported_rates & SUPPORT_RATE_CCK)
 839                 num_rates += 4;
 840         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 841                 num_rates += 8;
 842
 843         channels = kcalloc(spec->num_channels, sizeof(*channels), GFP_KERNEL);
 844         if (!channels)
 845                 return -ENOMEM;
 846
 847         rates = kcalloc(num_rates, sizeof(*rates), GFP_KERNEL);
 848         if (!rates)
 849                 goto exit_free_channels;
 850
 851         /*
 852          * Initialize Rate list.
 853          */
 854         for (i = 0; i < num_rates; i++)
 855                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 856
 857         /*
 858          * Initialize Channel list.
 859          */
 860         for (i = 0; i < spec->num_channels; i++) {
 861                 rt2x00lib_channel(&channels[i],
 862                                   spec->channels[i].channel,
 863                                   spec->channels_info[i].max_power, i);
 864         }
 865
 866         /*
 867          * Intitialize 802.11b, 802.11g
 868          * Rates: CCK, OFDM.
 869          * Channels: 2.4 GHz
 870          */
 871         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 872                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 873                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 874                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 875                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 876                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 877                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 878                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
 879                        &spec->ht, sizeof(spec->ht));
 880         }
 881
 882         /*
 883          * Intitialize 802.11a
 884          * Rates: OFDM.
 885          * Channels: OFDM, UNII, HiperLAN2.
 886          */
 887         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 888                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 889                     spec->num_channels - 14;
 890                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 891                     num_rates - 4;
 892                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 893                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 894                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 895                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 896                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
 897                        &spec->ht, sizeof(spec->ht));
 898         }
 899
 900         return 0;
 901
 902  exit_free_channels:
 903         kfree(channels);
 904         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 905         return -ENOMEM;
 906 }
 907
 908 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 909 {
 910         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 911                 ieee80211_unregister_hw(rt2x00dev->hw);
 912
 913         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 914                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 915                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 916                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 917                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 918         }
 919
 920         kfree(rt2x00dev->spec.channels_info);
 921 }
 922
 923 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 924 {
 925         struct hw_mode_spec *spec = &rt2x00dev->spec;
 926         int status;
 927
 928         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 929                 return 0;
 930
 931         /*
 932          * Initialize HW modes.
 933          */
 934         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 935         if (status)
 936                 return status;
 937
 938         /*
 939          * Initialize HW fields.
 940          */
 941         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 942
 943         /*
 944          * Initialize extra TX headroom required.
 945          */
 946         rt2x00dev->hw->extra_tx_headroom =
 947                 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
 948                       rt2x00dev->ops->extra_tx_headroom);
 949
 950         /*
 951          * Take TX headroom required for alignment into account.
 952          */
 953         if (test_bit(REQUIRE_L2PAD, &rt2x00dev->cap_flags))
 954                 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
 955         else if (test_bit(REQUIRE_DMA, &rt2x00dev->cap_flags))
 956                 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
 957
 958         /*
 959          * Tell mac80211 about the size of our private STA structure.
 960          */
 961         rt2x00dev->hw->sta_data_size = sizeof(struct rt2x00_sta);
 962
 963         /*
 964          * Allocate tx status FIFO for driver use.
 965          */
 966         if (test_bit(REQUIRE_TXSTATUS_FIFO, &rt2x00dev->cap_flags)) {
 967                 /*
 968                  * Allocate the txstatus fifo. In the worst case the tx
 969                  * status fifo has to hold the tx status of all entries
 970                  * in all tx queues. Hence, calculate the kfifo size as
 971                  * tx_queues * entry_num and round up to the nearest
 972                  * power of 2.
 973                  */
 974                 int kfifo_size =
 975                         roundup_pow_of_two(rt2x00dev->ops->tx_queues *
 976                                            rt2x00dev->ops->tx->entry_num *
 977                                            sizeof(u32));
 978
 979                 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, kfifo_size,
 980                                      GFP_KERNEL);
 981                 if (status)
 982                         return status;
 983         }
 984
 985         /*
 986          * Initialize tasklets if used by the driver. Tasklets are
 987          * disabled until the interrupts are turned on. The driver
 988          * has to handle that.
 989          */
 990 #define RT2X00_TASKLET_INIT(taskletname) \
 991         if (rt2x00dev->ops->lib->taskletname) { \
 992                 tasklet_init(&rt2x00dev->taskletname, \
 993                              rt2x00dev->ops->lib->taskletname, \
 994                              (unsigned long)rt2x00dev); \
 995         }
 996
 997         RT2X00_TASKLET_INIT(txstatus_tasklet);
 998         RT2X00_TASKLET_INIT(pretbtt_tasklet);
 999         RT2X00_TASKLET_INIT(tbtt_tasklet);
1000         RT2X00_TASKLET_INIT(rxdone_tasklet);
1001         RT2X00_TASKLET_INIT(autowake_tasklet);
1002
1003 #undef RT2X00_TASKLET_INIT
1004
1005         /*
1006          * Register HW.
1007          */
1008         status = ieee80211_register_hw(rt2x00dev->hw);
1009         if (status)
1010                 return status;
1011
1012         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
1013
1014         return 0;
1015 }
1016
1017 /*
1018  * Initialization/uninitialization handlers.
1019  */
1020 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
1021 {
1022         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1023                 return;
1024
1025         /*
1026          * Unregister extra components.
1027          */
1028         rt2x00rfkill_unregister(rt2x00dev);
1029
1030         /*
1031          * Allow the HW to uninitialize.
1032          */
1033         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1034
1035         /*
1036          * Free allocated queue entries.
1037          */
1038         rt2x00queue_uninitialize(rt2x00dev);
1039 }
1040
1041 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1042 {
1043         int status;
1044
1045         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1046                 return 0;
1047
1048         /*
1049          * Allocate all queue entries.
1050          */
1051         status = rt2x00queue_initialize(rt2x00dev);
1052         if (status)
1053                 return status;
1054
1055         /*
1056          * Initialize the device.
1057          */
1058         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1059         if (status) {
1060                 rt2x00queue_uninitialize(rt2x00dev);
1061                 return status;
1062         }
1063
1064         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
1065
1066         return 0;
1067 }
1068
1069 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1070 {
1071         int retval;
1072
1073         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1074                 return 0;
1075
1076         /*
1077          * If this is the first interface which is added,
1078          * we should load the firmware now.
1079          */
1080         retval = rt2x00lib_load_firmware(rt2x00dev);
1081         if (retval)
1082                 return retval;
1083
1084         /*
1085          * Initialize the device.
1086          */
1087         retval = rt2x00lib_initialize(rt2x00dev);
1088         if (retval)
1089                 return retval;
1090
1091         rt2x00dev->intf_ap_count = 0;
1092         rt2x00dev->intf_sta_count = 0;
1093         rt2x00dev->intf_associated = 0;
1094
1095         /* Enable the radio */
1096         retval = rt2x00lib_enable_radio(rt2x00dev);
1097         if (retval)
1098                 return retval;
1099
1100         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
1101
1102         return 0;
1103 }
1104
1105 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1106 {
1107         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1108                 return;
1109
1110         /*
1111          * Perhaps we can add something smarter here,
1112          * but for now just disabling the radio should do.
1113          */
1114         rt2x00lib_disable_radio(rt2x00dev);
1115
1116         rt2x00dev->intf_ap_count = 0;
1117         rt2x00dev->intf_sta_count = 0;
1118         rt2x00dev->intf_associated = 0;
1119 }
1120
1121 /*
1122  * driver allocation handlers.
1123  */
1124 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1125 {
1126         int retval = -ENOMEM;
1127
1128         /*
1129          * Allocate the driver data memory, if necessary.
1130          */
1131         if (rt2x00dev->ops->drv_data_size > 0) {
1132                 rt2x00dev->drv_data = kzalloc(rt2x00dev->ops->drv_data_size,
1133                                               GFP_KERNEL);
1134                 if (!rt2x00dev->drv_data) {
1135                         retval = -ENOMEM;
1136                         goto exit;
1137                 }
1138         }
1139
1140         spin_lock_init(&rt2x00dev->irqmask_lock);
1141         mutex_init(&rt2x00dev->csr_mutex);
1142
1143         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1144
1145         /*
1146          * Make room for rt2x00_intf inside the per-interface
1147          * structure ieee80211_vif.
1148          */
1149         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1150
1151         /*
1152          * Determine which operating modes are supported, all modes
1153          * which require beaconing, depend on the availability of
1154          * beacon entries.
1155          */
1156         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
1157         if (rt2x00dev->ops->bcn->entry_num > 0)
1158                 rt2x00dev->hw->wiphy->interface_modes |=
1159                     BIT(NL80211_IFTYPE_ADHOC) |
1160                     BIT(NL80211_IFTYPE_AP) |
1161                     BIT(NL80211_IFTYPE_MESH_POINT) |
1162                     BIT(NL80211_IFTYPE_WDS);
1163
1164         rt2x00dev->hw->wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
1165
1166         /*
1167          * Initialize work.
1168          */
1169         rt2x00dev->workqueue =
1170             alloc_ordered_workqueue(wiphy_name(rt2x00dev->hw->wiphy), 0);
1171         if (!rt2x00dev->workqueue) {
1172                 retval = -ENOMEM;
1173                 goto exit;
1174         }
1175
1176         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1177         INIT_DELAYED_WORK(&rt2x00dev->autowakeup_work, rt2x00lib_autowakeup);
1178         INIT_WORK(&rt2x00dev->sleep_work, rt2x00lib_sleep);
1179
1180         /*
1181          * Let the driver probe the device to detect the capabilities.
1182          */
1183         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1184         if (retval) {
1185                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1186                 goto exit;
1187         }
1188
1189         /*
1190          * Allocate queue array.
1191          */
1192         retval = rt2x00queue_allocate(rt2x00dev);
1193         if (retval)
1194                 goto exit;
1195
1196         /*
1197          * Initialize ieee80211 structure.
1198          */
1199         retval = rt2x00lib_probe_hw(rt2x00dev);
1200         if (retval) {
1201                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1202                 goto exit;
1203         }
1204
1205         /*
1206          * Register extra components.
1207          */
1208         rt2x00link_register(rt2x00dev);
1209         rt2x00leds_register(rt2x00dev);
1210         rt2x00debug_register(rt2x00dev);
1211         rt2x00rfkill_register(rt2x00dev);
1212
1213         return 0;
1214
1215 exit:
1216         rt2x00lib_remove_dev(rt2x00dev);
1217
1218         return retval;
1219 }
1220 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1221
1222 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1223 {
1224         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1225
1226         /*
1227          * Disable radio.
1228          */
1229         rt2x00lib_disable_radio(rt2x00dev);
1230
1231         /*
1232          * Stop all work.
1233          */
1234         cancel_work_sync(&rt2x00dev->intf_work);
1235         cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
1236         cancel_work_sync(&rt2x00dev->sleep_work);
1237         if (rt2x00_is_usb(rt2x00dev)) {
1238                 hrtimer_cancel(&rt2x00dev->txstatus_timer);
1239                 cancel_work_sync(&rt2x00dev->rxdone_work);
1240                 cancel_work_sync(&rt2x00dev->txdone_work);
1241         }
1242         if (rt2x00dev->workqueue)
1243                 destroy_workqueue(rt2x00dev->workqueue);
1244
1245         /*
1246          * Free the tx status fifo.
1247          */
1248         kfifo_free(&rt2x00dev->txstatus_fifo);
1249
1250         /*
1251          * Kill the tx status tasklet.
1252          */
1253         tasklet_kill(&rt2x00dev->txstatus_tasklet);
1254         tasklet_kill(&rt2x00dev->pretbtt_tasklet);
1255         tasklet_kill(&rt2x00dev->tbtt_tasklet);
1256         tasklet_kill(&rt2x00dev->rxdone_tasklet);
1257         tasklet_kill(&rt2x00dev->autowake_tasklet);
1258
1259         /*
1260          * Uninitialize device.
1261          */
1262         rt2x00lib_uninitialize(rt2x00dev);
1263
1264         /*
1265          * Free extra components
1266          */
1267         rt2x00debug_deregister(rt2x00dev);
1268         rt2x00leds_unregister(rt2x00dev);
1269
1270         /*
1271          * Free ieee80211_hw memory.
1272          */
1273         rt2x00lib_remove_hw(rt2x00dev);
1274
1275         /*
1276          * Free firmware image.
1277          */
1278         rt2x00lib_free_firmware(rt2x00dev);
1279
1280         /*
1281          * Free queue structures.
1282          */
1283         rt2x00queue_free(rt2x00dev);
1284
1285         /*
1286          * Free the driver data.
1287          */
1288         if (rt2x00dev->drv_data)
1289                 kfree(rt2x00dev->drv_data);
1290 }
1291 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1292
1293 /*
1294  * Device state handlers
1295  */
1296 #ifdef CONFIG_PM
1297 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1298 {
1299         NOTICE(rt2x00dev, "Going to sleep.\n");
1300
1301         /*
1302          * Prevent mac80211 from accessing driver while suspended.
1303          */
1304         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1305                 return 0;
1306
1307         /*
1308          * Cleanup as much as possible.
1309          */
1310         rt2x00lib_uninitialize(rt2x00dev);
1311
1312         /*
1313          * Suspend/disable extra components.
1314          */
1315         rt2x00leds_suspend(rt2x00dev);
1316         rt2x00debug_deregister(rt2x00dev);
1317
1318         /*
1319          * Set device mode to sleep for power management,
1320          * on some hardware this call seems to consistently fail.
1321          * From the specifications it is hard to tell why it fails,
1322          * and if this is a "bad thing".
1323          * Overall it is safe to just ignore the failure and
1324          * continue suspending. The only downside is that the
1325          * device will not be in optimal power save mode, but with
1326          * the radio and the other components already disabled the
1327          * device is as good as disabled.
1328          */
1329         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1330                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1331                         "continue suspending.\n");
1332
1333         return 0;
1334 }
1335 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1336
1337 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1338 {
1339         NOTICE(rt2x00dev, "Waking up.\n");
1340
1341         /*
1342          * Restore/enable extra components.
1343          */
1344         rt2x00debug_register(rt2x00dev);
1345         rt2x00leds_resume(rt2x00dev);
1346
1347         /*
1348          * We are ready again to receive requests from mac80211.
1349          */
1350         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1351
1352         return 0;
1353 }
1354 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1355 #endif /* CONFIG_PM */
1356
1357 /*
1358  * rt2x00lib module information.
1359  */
1360 MODULE_AUTHOR(DRV_PROJECT);
1361 MODULE_VERSION(DRV_VERSION);
1362 MODULE_DESCRIPTION("rt2x00 library");
1363 MODULE_LICENSE("GPL");