drivers/net/wireless/rt2x00/rt2x00dev.c

   1 /*
   2         Copyright (C) 2010 Willow Garage <http://www.willowgarage.com>
   3         Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
   4         <http://rt2x00.serialmonkey.com>
   5
   6         This program is free software; you can redistribute it and/or modify
   7         it under the terms of the GNU General Public License as published by
   8         the Free Software Foundation; either version 2 of the License, or
   9         (at your option) any later version.
  10
  11         This program is distributed in the hope that it will be useful,
  12         but WITHOUT ANY WARRANTY; without even the implied warranty of
  13         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14         GNU General Public License for more details.
  15
  16         You should have received a copy of the GNU General Public License
  17         along with this program; if not, write to the
  18         Free Software Foundation, Inc.,
  19         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  */
  21
  22 /*
  23         Module: rt2x00lib
  24         Abstract: rt2x00 generic device routines.
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/slab.h>
  30 #include <linux/log2.h>
  31
  32 #include "rt2x00.h"
  33 #include "rt2x00lib.h"
  34
  35 /*
  36  * Radio control handlers.
  37  */
  38 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  39 {
  40         int status;
  41
  42         /*
  43          * Don't enable the radio twice.
  44          * And check if the hardware button has been disabled.
  45          */
  46         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  47                 return 0;
  48
  49         /*
  50          * Initialize all data queues.
  51          */
  52         rt2x00queue_init_queues(rt2x00dev);
  53
  54         /*
  55          * Enable radio.
  56          */
  57         status =
  58             rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
  59         if (status)
  60                 return status;
  61
  62         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
  63
  64         rt2x00leds_led_radio(rt2x00dev, true);
  65         rt2x00led_led_activity(rt2x00dev, true);
  66
  67         set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
  68
  69         /*
  70          * Enable queues.
  71          */
  72         rt2x00queue_start_queues(rt2x00dev);
  73         rt2x00link_start_tuner(rt2x00dev);
  74         rt2x00link_start_agc(rt2x00dev);
  75
  76         /*
  77          * Start watchdog monitoring.
  78          */
  79         rt2x00link_start_watchdog(rt2x00dev);
  80
  81         return 0;
  82 }
  83
  84 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
  85 {
  86         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  87                 return;
  88
  89         /*
  90          * Stop watchdog monitoring.
  91          */
  92         rt2x00link_stop_watchdog(rt2x00dev);
  93
  94         /*
  95          * Stop all queues
  96          */
  97         rt2x00link_stop_agc(rt2x00dev);
  98         rt2x00link_stop_tuner(rt2x00dev);
  99         rt2x00queue_stop_queues(rt2x00dev);
 100         rt2x00queue_flush_queues(rt2x00dev, true);
 101
 102         /*
 103          * Disable radio.
 104          */
 105         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 106         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 107         rt2x00led_led_activity(rt2x00dev, false);
 108         rt2x00leds_led_radio(rt2x00dev, false);
 109 }
 110
 111 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 112                                           struct ieee80211_vif *vif)
 113 {
 114         struct rt2x00_dev *rt2x00dev = data;
 115         struct rt2x00_intf *intf = vif_to_intf(vif);
 116
 117         /*
 118          * It is possible the radio was disabled while the work had been
 119          * scheduled. If that happens we should return here immediately,
 120          * note that in the spinlock protected area above the delayed_flags
 121          * have been cleared correctly.
 122          */
 123         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 124                 return;
 125
 126         if (test_and_clear_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags))
 127                 rt2x00queue_update_beacon(rt2x00dev, vif);
 128 }
 129
 130 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 131 {
 132         struct rt2x00_dev *rt2x00dev =
 133             container_of(work, struct rt2x00_dev, intf_work);
 134
 135         /*
 136          * Iterate over each interface and perform the
 137          * requested configurations.
 138          */
 139         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 140                                             rt2x00lib_intf_scheduled_iter,
 141                                             rt2x00dev);
 142 }
 143
 144 static void rt2x00lib_autowakeup(struct work_struct *work)
 145 {
 146         struct rt2x00_dev *rt2x00dev =
 147             container_of(work, struct rt2x00_dev, autowakeup_work.work);
 148
 149         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 150                 return;
 151
 152         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_AWAKE))
 153                 ERROR(rt2x00dev, "Device failed to wakeup.\n");
 154         clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
 155 }
 156
 157 /*
 158  * Interrupt context handlers.
 159  */
 160 static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac,
 161                                      struct ieee80211_vif *vif)
 162 {
 163         struct rt2x00_dev *rt2x00dev = data;
 164         struct sk_buff *skb;
 165
 166         /*
 167          * Only AP mode interfaces do broad- and multicast buffering
 168          */
 169         if (vif->type != NL80211_IFTYPE_AP)
 170                 return;
 171
 172         /*
 173          * Send out buffered broad- and multicast frames
 174          */
 175         skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 176         while (skb) {
 177                 rt2x00mac_tx(rt2x00dev->hw, skb);
 178                 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 179         }
 180 }
 181
 182 static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac,
 183                                         struct ieee80211_vif *vif)
 184 {
 185         struct rt2x00_dev *rt2x00dev = data;
 186
 187         if (vif->type != NL80211_IFTYPE_AP &&
 188             vif->type != NL80211_IFTYPE_ADHOC &&
 189             vif->type != NL80211_IFTYPE_MESH_POINT &&
 190             vif->type != NL80211_IFTYPE_WDS)
 191                 return;
 192
 193         /*
 194          * Update the beacon without locking. This is safe on PCI devices
 195          * as they only update the beacon periodically here. This should
 196          * never be called for USB devices.
 197          */
 198         WARN_ON(rt2x00_is_usb(rt2x00dev));
 199         rt2x00queue_update_beacon_locked(rt2x00dev, vif);
 200 }
 201
 202 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 203 {
 204         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 205                 return;
 206
 207         /* send buffered bc/mc frames out for every bssid */
 208         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 209                                                    rt2x00lib_bc_buffer_iter,
 210                                                    rt2x00dev);
 211         /*
 212          * Devices with pre tbtt interrupt don't need to update the beacon
 213          * here as they will fetch the next beacon directly prior to
 214          * transmission.
 215          */
 216         if (test_bit(CAPABILITY_PRE_TBTT_INTERRUPT, &rt2x00dev->cap_flags))
 217                 return;
 218
 219         /* fetch next beacon */
 220         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 221                                                    rt2x00lib_beaconupdate_iter,
 222                                                    rt2x00dev);
 223 }
 224 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 225
 226 void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev)
 227 {
 228         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 229                 return;
 230
 231         /* fetch next beacon */
 232         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 233                                                    rt2x00lib_beaconupdate_iter,
 234                                                    rt2x00dev);
 235 }
 236 EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
 237
 238 void rt2x00lib_dmastart(struct queue_entry *entry)
 239 {
 240         set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 241         rt2x00queue_index_inc(entry, Q_INDEX);
 242 }
 243 EXPORT_SYMBOL_GPL(rt2x00lib_dmastart);
 244
 245 void rt2x00lib_dmadone(struct queue_entry *entry)
 246 {
 247         set_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags);
 248         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 249         rt2x00queue_index_inc(entry, Q_INDEX_DMA_DONE);
 250 }
 251 EXPORT_SYMBOL_GPL(rt2x00lib_dmadone);
 252
 253 void rt2x00lib_txdone(struct queue_entry *entry,
 254                       struct txdone_entry_desc *txdesc)
 255 {
 256         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 257         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 258         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 259         unsigned int header_length, i;
 260         u8 rate_idx, rate_flags, retry_rates;
 261         u8 skbdesc_flags = skbdesc->flags;
 262         bool success;
 263
 264         /*
 265          * Unmap the skb.
 266          */
 267         rt2x00queue_unmap_skb(entry);
 268
 269         /*
 270          * Remove the extra tx headroom from the skb.
 271          */
 272         skb_pull(entry->skb, rt2x00dev->ops->extra_tx_headroom);
 273
 274         /*
 275          * Signal that the TX descriptor is no longer in the skb.
 276          */
 277         skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
 278
 279         /*
 280          * Determine the length of 802.11 header.
 281          */
 282         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 283
 284         /*
 285          * Remove L2 padding which was added during
 286          */
 287         if (test_bit(REQUIRE_L2PAD, &rt2x00dev->cap_flags))
 288                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 289
 290         /*
 291          * If the IV/EIV data was stripped from the frame before it was
 292          * passed to the hardware, we should now reinsert it again because
 293          * mac80211 will expect the same data to be present it the
 294          * frame as it was passed to us.
 295          */
 296         if (test_bit(CAPABILITY_HW_CRYPTO, &rt2x00dev->cap_flags))
 297                 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
 298
 299         /*
 300          * Send frame to debugfs immediately, after this call is completed
 301          * we are going to overwrite the skb->cb array.
 302          */
 303         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 304
 305         /*
 306          * Determine if the frame has been successfully transmitted.
 307          */
 308         success =
 309             test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 310             test_bit(TXDONE_UNKNOWN, &txdesc->flags);
 311
 312         /*
 313          * Update TX statistics.
 314          */
 315         rt2x00dev->link.qual.tx_success += success;
 316         rt2x00dev->link.qual.tx_failed += !success;
 317
 318         rate_idx = skbdesc->tx_rate_idx;
 319         rate_flags = skbdesc->tx_rate_flags;
 320         retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
 321             (txdesc->retry + 1) : 1;
 322
 323         /*
 324          * Initialize TX status
 325          */
 326         memset(&tx_info->status, 0, sizeof(tx_info->status));
 327         tx_info->status.ack_signal = 0;
 328
 329         /*
 330          * Frame was send with retries, hardware tried
 331          * different rates to send out the frame, at each
 332          * retry it lowered the rate 1 step except when the
 333          * lowest rate was used.
 334          */
 335         for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
 336                 tx_info->status.rates[i].idx = rate_idx - i;
 337                 tx_info->status.rates[i].flags = rate_flags;
 338
 339                 if (rate_idx - i == 0) {
 340                         /*
 341                          * The lowest rate (index 0) was used until the
 342                          * number of max retries was reached.
 343                          */
 344                         tx_info->status.rates[i].count = retry_rates - i;
 345                         i++;
 346                         break;
 347                 }
 348                 tx_info->status.rates[i].count = 1;
 349         }
 350         if (i < (IEEE80211_TX_MAX_RATES - 1))
 351                 tx_info->status.rates[i].idx = -1; /* terminate */
 352
 353         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 354                 if (success)
 355                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 356                 else
 357                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 358         }
 359
 360         /*
 361          * Every single frame has it's own tx status, hence report
 362          * every frame as ampdu of size 1.
 363          *
 364          * TODO: if we can find out how many frames were aggregated
 365          * by the hw we could provide the real ampdu_len to mac80211
 366          * which would allow the rc algorithm to better decide on
 367          * which rates are suitable.
 368          */
 369         if (test_bit(TXDONE_AMPDU, &txdesc->flags) ||
 370             tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 371                 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
 372                 tx_info->status.ampdu_len = 1;
 373                 tx_info->status.ampdu_ack_len = success ? 1 : 0;
 374
 375                 if (!success)
 376                         tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
 377         }
 378
 379         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 380                 if (success)
 381                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 382                 else
 383                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 384         }
 385
 386         /*
 387          * Only send the status report to mac80211 when it's a frame
 388          * that originated in mac80211. If this was a extra frame coming
 389          * through a mac80211 library call (RTS/CTS) then we should not
 390          * send the status report back.
 391          */
 392         if (!(skbdesc_flags & SKBDESC_NOT_MAC80211)) {
 393                 if (test_bit(REQUIRE_TASKLET_CONTEXT, &rt2x00dev->cap_flags))
 394                         ieee80211_tx_status(rt2x00dev->hw, entry->skb);
 395                 else
 396                         ieee80211_tx_status_ni(rt2x00dev->hw, entry->skb);
 397         } else
 398                 dev_kfree_skb_any(entry->skb);
 399
 400         /*
 401          * Make this entry available for reuse.
 402          */
 403         entry->skb = NULL;
 404         entry->flags = 0;
 405
 406         rt2x00dev->ops->lib->clear_entry(entry);
 407
 408         rt2x00queue_index_inc(entry, Q_INDEX_DONE);
 409
 410         /*
 411          * If the data queue was below the threshold before the txdone
 412          * handler we must make sure the packet queue in the mac80211 stack
 413          * is reenabled when the txdone handler has finished.
 414          */
 415         if (!rt2x00queue_threshold(entry->queue))
 416                 rt2x00queue_unpause_queue(entry->queue);
 417 }
 418 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 419
 420 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
 421 {
 422         struct txdone_entry_desc txdesc;
 423
 424         txdesc.flags = 0;
 425         __set_bit(status, &txdesc.flags);
 426         txdesc.retry = 0;
 427
 428         rt2x00lib_txdone(entry, &txdesc);
 429 }
 430 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
 431
 432 static u8 *rt2x00lib_find_ie(u8 *data, unsigned int len, u8 ie)
 433 {
 434         struct ieee80211_mgmt *mgmt = (void *)data;
 435         u8 *pos, *end;
 436
 437         pos = (u8 *)mgmt->u.beacon.variable;
 438         end = data + len;
 439         while (pos < end) {
 440                 if (pos + 2 + pos[1] > end)
 441                         return NULL;
 442
 443                 if (pos[0] == ie)
 444                         return pos;
 445
 446                 pos += 2 + pos[1];
 447         }
 448
 449         return NULL;
 450 }
 451
 452 static void rt2x00lib_sleep(struct work_struct *work)
 453 {
 454         struct rt2x00_dev *rt2x00dev =
 455             container_of(work, struct rt2x00_dev, sleep_work);
 456
 457         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 458                 return;
 459
 460         /*
 461          * Check again is powersaving is enabled, to prevent races from delayed
 462          * work execution.
 463          */
 464         if (!test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 465                 rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf,
 466                                  IEEE80211_CONF_CHANGE_PS);
 467 }
 468
 469 static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev,
 470                                       struct sk_buff *skb,
 471                                       struct rxdone_entry_desc *rxdesc)
 472 {
 473         struct ieee80211_hdr *hdr = (void *) skb->data;
 474         struct ieee80211_tim_ie *tim_ie;
 475         u8 *tim;
 476         u8 tim_len;
 477         bool cam;
 478
 479         /* If this is not a beacon, or if mac80211 has no powersaving
 480          * configured, or if the device is already in powersaving mode
 481          * we can exit now. */
 482         if (likely(!ieee80211_is_beacon(hdr->frame_control) ||
 483                    !(rt2x00dev->hw->conf.flags & IEEE80211_CONF_PS)))
 484                 return;
 485
 486         /* min. beacon length + FCS_LEN */
 487         if (skb->len <= 40 + FCS_LEN)
 488                 return;
 489
 490         /* and only beacons from the associated BSSID, please */
 491         if (!(rxdesc->dev_flags & RXDONE_MY_BSS) ||
 492             !rt2x00dev->aid)
 493                 return;
 494
 495         rt2x00dev->last_beacon = jiffies;
 496
 497         tim = rt2x00lib_find_ie(skb->data, skb->len - FCS_LEN, WLAN_EID_TIM);
 498         if (!tim)
 499                 return;
 500
 501         if (tim[1] < sizeof(*tim_ie))
 502                 return;
 503
 504         tim_len = tim[1];
 505         tim_ie = (struct ieee80211_tim_ie *) &tim[2];
 506
 507         /* Check whenever the PHY can be turned off again. */
 508
 509         /* 1. What about buffered unicast traffic for our AID? */
 510         cam = ieee80211_check_tim(tim_ie, tim_len, rt2x00dev->aid);
 511
 512         /* 2. Maybe the AP wants to send multicast/broadcast data? */
 513         cam |= (tim_ie->bitmap_ctrl & 0x01);
 514
 515         if (!cam && !test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 516                 queue_work(rt2x00dev->workqueue, &rt2x00dev->sleep_work);
 517 }
 518
 519 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 520                                         struct rxdone_entry_desc *rxdesc)
 521 {
 522         struct ieee80211_supported_band *sband;
 523         const struct rt2x00_rate *rate;
 524         unsigned int i;
 525         int signal = rxdesc->signal;
 526         int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 527
 528         switch (rxdesc->rate_mode) {
 529         case RATE_MODE_CCK:
 530         case RATE_MODE_OFDM:
 531                 /*
 532                  * For non-HT rates the MCS value needs to contain the
 533                  * actually used rate modulation (CCK or OFDM).
 534                  */
 535                 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 536                         signal = RATE_MCS(rxdesc->rate_mode, signal);
 537
 538                 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 539                 for (i = 0; i < sband->n_bitrates; i++) {
 540                         rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 541                         if (((type == RXDONE_SIGNAL_PLCP) &&
 542                              (rate->plcp == signal)) ||
 543                             ((type == RXDONE_SIGNAL_BITRATE) &&
 544                               (rate->bitrate == signal)) ||
 545                             ((type == RXDONE_SIGNAL_MCS) &&
 546                               (rate->mcs == signal))) {
 547                                 return i;
 548                         }
 549                 }
 550                 break;
 551         case RATE_MODE_HT_MIX:
 552         case RATE_MODE_HT_GREENFIELD:
 553                 if (signal >= 0 && signal <= 76)
 554                         return signal;
 555                 break;
 556         default:
 557                 break;
 558         }
 559
 560         WARNING(rt2x00dev, "Frame received with unrecognized signal, "
 561                 "mode=0x%.4x, signal=0x%.4x, type=%d.\n",
 562                 rxdesc->rate_mode, signal, type);
 563         return 0;
 564 }
 565
 566 void rt2x00lib_rxdone(struct queue_entry *entry)
 567 {
 568         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 569         struct rxdone_entry_desc rxdesc;
 570         struct sk_buff *skb;
 571         struct ieee80211_rx_status *rx_status;
 572         unsigned int header_length;
 573         int rate_idx;
 574
 575         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 576             !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 577                 goto submit_entry;
 578
 579         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 580                 goto submit_entry;
 581
 582         /*
 583          * Allocate a new sk_buffer. If no new buffer available, drop the
 584          * received frame and reuse the existing buffer.
 585          */
 586         skb = rt2x00queue_alloc_rxskb(entry);
 587         if (!skb)
 588                 goto submit_entry;
 589
 590         /*
 591          * Unmap the skb.
 592          */
 593         rt2x00queue_unmap_skb(entry);
 594
 595         /*
 596          * Extract the RXD details.
 597          */
 598         memset(&rxdesc, 0, sizeof(rxdesc));
 599         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 600
 601         /*
 602          * The data behind the ieee80211 header must be
 603          * aligned on a 4 byte boundary.
 604          */
 605         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 606
 607         /*
 608          * Hardware might have stripped the IV/EIV/ICV data,
 609          * in that case it is possible that the data was
 610          * provided separately (through hardware descriptor)
 611          * in which case we should reinsert the data into the frame.
 612          */
 613         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 614             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 615                 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
 616                                           &rxdesc);
 617         else if (header_length &&
 618                  (rxdesc.size > header_length) &&
 619                  (rxdesc.dev_flags & RXDONE_L2PAD))
 620                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 621
 622         /* Trim buffer to correct size */
 623         skb_trim(entry->skb, rxdesc.size);
 624
 625         /*
 626          * Translate the signal to the correct bitrate index.
 627          */
 628         rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 629         if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
 630             rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
 631                 rxdesc.flags |= RX_FLAG_HT;
 632
 633         /*
 634          * Check if this is a beacon, and more frames have been
 635          * buffered while we were in powersaving mode.
 636          */
 637         rt2x00lib_rxdone_check_ps(rt2x00dev, entry->skb, &rxdesc);
 638
 639         /*
 640          * Update extra components
 641          */
 642         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 643         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 644         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 645
 646         /*
 647          * Initialize RX status information, and send frame
 648          * to mac80211.
 649          */
 650         rx_status = IEEE80211_SKB_RXCB(entry->skb);
 651         rx_status->mactime = rxdesc.timestamp;
 652         rx_status->band = rt2x00dev->curr_band;
 653         rx_status->freq = rt2x00dev->curr_freq;
 654         rx_status->rate_idx = rate_idx;
 655         rx_status->signal = rxdesc.rssi;
 656         rx_status->flag = rxdesc.flags;
 657         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 658
 659         ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
 660
 661         /*
 662          * Replace the skb with the freshly allocated one.
 663          */
 664         entry->skb = skb;
 665
 666 submit_entry:
 667         entry->flags = 0;
 668         rt2x00queue_index_inc(entry, Q_INDEX_DONE);
 669         if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
 670             test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 671                 rt2x00dev->ops->lib->clear_entry(entry);
 672 }
 673 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 674
 675 /*
 676  * Driver initialization handlers.
 677  */
 678 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 679         {
 680                 .flags = DEV_RATE_CCK,
 681                 .bitrate = 10,
 682                 .ratemask = BIT(0),
 683                 .plcp = 0x00,
 684                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 685         },
 686         {
 687                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 688                 .bitrate = 20,
 689                 .ratemask = BIT(1),
 690                 .plcp = 0x01,
 691                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 692         },
 693         {
 694                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 695                 .bitrate = 55,
 696                 .ratemask = BIT(2),
 697                 .plcp = 0x02,
 698                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 699         },
 700         {
 701                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 702                 .bitrate = 110,
 703                 .ratemask = BIT(3),
 704                 .plcp = 0x03,
 705                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 706         },
 707         {
 708                 .flags = DEV_RATE_OFDM,
 709                 .bitrate = 60,
 710                 .ratemask = BIT(4),
 711                 .plcp = 0x0b,
 712                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 713         },
 714         {
 715                 .flags = DEV_RATE_OFDM,
 716                 .bitrate = 90,
 717                 .ratemask = BIT(5),
 718                 .plcp = 0x0f,
 719                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 720         },
 721         {
 722                 .flags = DEV_RATE_OFDM,
 723                 .bitrate = 120,
 724                 .ratemask = BIT(6),
 725                 .plcp = 0x0a,
 726                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 727         },
 728         {
 729                 .flags = DEV_RATE_OFDM,
 730                 .bitrate = 180,
 731                 .ratemask = BIT(7),
 732                 .plcp = 0x0e,
 733                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 734         },
 735         {
 736                 .flags = DEV_RATE_OFDM,
 737                 .bitrate = 240,
 738                 .ratemask = BIT(8),
 739                 .plcp = 0x09,
 740                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 741         },
 742         {
 743                 .flags = DEV_RATE_OFDM,
 744                 .bitrate = 360,
 745                 .ratemask = BIT(9),
 746                 .plcp = 0x0d,
 747                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 748         },
 749         {
 750                 .flags = DEV_RATE_OFDM,
 751                 .bitrate = 480,
 752                 .ratemask = BIT(10),
 753                 .plcp = 0x08,
 754                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 755         },
 756         {
 757                 .flags = DEV_RATE_OFDM,
 758                 .bitrate = 540,
 759                 .ratemask = BIT(11),
 760                 .plcp = 0x0c,
 761                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 762         },
 763 };
 764
 765 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 766                               const int channel, const int tx_power,
 767                               const int value)
 768 {
 769         /* XXX: this assumption about the band is wrong for 802.11j */
 770         entry->band = channel <= 14 ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 771         entry->center_freq = ieee80211_channel_to_frequency(channel,
 772                                                             entry->band);
 773         entry->hw_value = value;
 774         entry->max_power = tx_power;
 775         entry->max_antenna_gain = 0xff;
 776 }
 777
 778 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 779                            const u16 index, const struct rt2x00_rate *rate)
 780 {
 781         entry->flags = 0;
 782         entry->bitrate = rate->bitrate;
 783         entry->hw_value = index;
 784         entry->hw_value_short = index;
 785
 786         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 787                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 788 }
 789
 790 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 791                                     struct hw_mode_spec *spec)
 792 {
 793         struct ieee80211_hw *hw = rt2x00dev->hw;
 794         struct ieee80211_channel *channels;
 795         struct ieee80211_rate *rates;
 796         unsigned int num_rates;
 797         unsigned int i;
 798
 799         num_rates = 0;
 800         if (spec->supported_rates & SUPPORT_RATE_CCK)
 801                 num_rates += 4;
 802         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 803                 num_rates += 8;
 804
 805         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 806         if (!channels)
 807                 return -ENOMEM;
 808
 809         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 810         if (!rates)
 811                 goto exit_free_channels;
 812
 813         /*
 814          * Initialize Rate list.
 815          */
 816         for (i = 0; i < num_rates; i++)
 817                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 818
 819         /*
 820          * Initialize Channel list.
 821          */
 822         for (i = 0; i < spec->num_channels; i++) {
 823                 rt2x00lib_channel(&channels[i],
 824                                   spec->channels[i].channel,
 825                                   spec->channels_info[i].max_power, i);
 826         }
 827
 828         /*
 829          * Intitialize 802.11b, 802.11g
 830          * Rates: CCK, OFDM.
 831          * Channels: 2.4 GHz
 832          */
 833         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 834                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 835                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 836                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 837                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 838                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 839                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 840                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
 841                        &spec->ht, sizeof(spec->ht));
 842         }
 843
 844         /*
 845          * Intitialize 802.11a
 846          * Rates: OFDM.
 847          * Channels: OFDM, UNII, HiperLAN2.
 848          */
 849         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 850                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 851                     spec->num_channels - 14;
 852                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 853                     num_rates - 4;
 854                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 855                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 856                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 857                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 858                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
 859                        &spec->ht, sizeof(spec->ht));
 860         }
 861
 862         return 0;
 863
 864  exit_free_channels:
 865         kfree(channels);
 866         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 867         return -ENOMEM;
 868 }
 869
 870 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 871 {
 872         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 873                 ieee80211_unregister_hw(rt2x00dev->hw);
 874
 875         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 876                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 877                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 878                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 879                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 880         }
 881
 882         kfree(rt2x00dev->spec.channels_info);
 883 }
 884
 885 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 886 {
 887         struct hw_mode_spec *spec = &rt2x00dev->spec;
 888         int status;
 889
 890         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 891                 return 0;
 892
 893         /*
 894          * Initialize HW modes.
 895          */
 896         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 897         if (status)
 898                 return status;
 899
 900         /*
 901          * Initialize HW fields.
 902          */
 903         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 904
 905         /*
 906          * Initialize extra TX headroom required.
 907          */
 908         rt2x00dev->hw->extra_tx_headroom =
 909                 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
 910                       rt2x00dev->ops->extra_tx_headroom);
 911
 912         /*
 913          * Take TX headroom required for alignment into account.
 914          */
 915         if (test_bit(REQUIRE_L2PAD, &rt2x00dev->cap_flags))
 916                 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
 917         else if (test_bit(REQUIRE_DMA, &rt2x00dev->cap_flags))
 918                 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
 919
 920         /*
 921          * Allocate tx status FIFO for driver use.
 922          */
 923         if (test_bit(REQUIRE_TXSTATUS_FIFO, &rt2x00dev->cap_flags)) {
 924                 /*
 925                  * Allocate the txstatus fifo. In the worst case the tx
 926                  * status fifo has to hold the tx status of all entries
 927                  * in all tx queues. Hence, calculate the kfifo size as
 928                  * tx_queues * entry_num and round up to the nearest
 929                  * power of 2.
 930                  */
 931                 int kfifo_size =
 932                         roundup_pow_of_two(rt2x00dev->ops->tx_queues *
 933                                            rt2x00dev->ops->tx->entry_num *
 934                                            sizeof(u32));
 935
 936                 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, kfifo_size,
 937                                      GFP_KERNEL);
 938                 if (status)
 939                         return status;
 940         }
 941
 942         /*
 943          * Initialize tasklets if used by the driver. Tasklets are
 944          * disabled until the interrupts are turned on. The driver
 945          * has to handle that.
 946          */
 947 #define RT2X00_TASKLET_INIT(taskletname) \
 948         if (rt2x00dev->ops->lib->taskletname) { \
 949                 tasklet_init(&rt2x00dev->taskletname, \
 950                              rt2x00dev->ops->lib->taskletname, \
 951                              (unsigned long)rt2x00dev); \
 952                 tasklet_disable(&rt2x00dev->taskletname); \
 953         }
 954
 955         RT2X00_TASKLET_INIT(txstatus_tasklet);
 956         RT2X00_TASKLET_INIT(pretbtt_tasklet);
 957         RT2X00_TASKLET_INIT(tbtt_tasklet);
 958         RT2X00_TASKLET_INIT(rxdone_tasklet);
 959         RT2X00_TASKLET_INIT(autowake_tasklet);
 960
 961 #undef RT2X00_TASKLET_INIT
 962
 963         /*
 964          * Register HW.
 965          */
 966         status = ieee80211_register_hw(rt2x00dev->hw);
 967         if (status)
 968                 return status;
 969
 970         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 971
 972         return 0;
 973 }
 974
 975 /*
 976  * Initialization/uninitialization handlers.
 977  */
 978 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 979 {
 980         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 981                 return;
 982
 983         /*
 984          * Unregister extra components.
 985          */
 986         rt2x00rfkill_unregister(rt2x00dev);
 987
 988         /*
 989          * Allow the HW to uninitialize.
 990          */
 991         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 992
 993         /*
 994          * Free allocated queue entries.
 995          */
 996         rt2x00queue_uninitialize(rt2x00dev);
 997 }
 998
 999 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1000 {
1001         int status;
1002
1003         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1004                 return 0;
1005
1006         /*
1007          * Allocate all queue entries.
1008          */
1009         status = rt2x00queue_initialize(rt2x00dev);
1010         if (status)
1011                 return status;
1012
1013         /*
1014          * Initialize the device.
1015          */
1016         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1017         if (status) {
1018                 rt2x00queue_uninitialize(rt2x00dev);
1019                 return status;
1020         }
1021
1022         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
1023
1024         /*
1025          * Register the extra components.
1026          */
1027         rt2x00rfkill_register(rt2x00dev);
1028
1029         return 0;
1030 }
1031
1032 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1033 {
1034         int retval;
1035
1036         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1037                 return 0;
1038
1039         /*
1040          * If this is the first interface which is added,
1041          * we should load the firmware now.
1042          */
1043         retval = rt2x00lib_load_firmware(rt2x00dev);
1044         if (retval)
1045                 return retval;
1046
1047         /*
1048          * Initialize the device.
1049          */
1050         retval = rt2x00lib_initialize(rt2x00dev);
1051         if (retval)
1052                 return retval;
1053
1054         rt2x00dev->intf_ap_count = 0;
1055         rt2x00dev->intf_sta_count = 0;
1056         rt2x00dev->intf_associated = 0;
1057
1058         /* Enable the radio */
1059         retval = rt2x00lib_enable_radio(rt2x00dev);
1060         if (retval)
1061                 return retval;
1062
1063         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
1064
1065         return 0;
1066 }
1067
1068 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1069 {
1070         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1071                 return;
1072
1073         /*
1074          * Perhaps we can add something smarter here,
1075          * but for now just disabling the radio should do.
1076          */
1077         rt2x00lib_disable_radio(rt2x00dev);
1078
1079         rt2x00dev->intf_ap_count = 0;
1080         rt2x00dev->intf_sta_count = 0;
1081         rt2x00dev->intf_associated = 0;
1082 }
1083
1084 /*
1085  * driver allocation handlers.
1086  */
1087 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1088 {
1089         int retval = -ENOMEM;
1090
1091         spin_lock_init(&rt2x00dev->irqmask_lock);
1092         mutex_init(&rt2x00dev->csr_mutex);
1093
1094         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1095
1096         /*
1097          * Make room for rt2x00_intf inside the per-interface
1098          * structure ieee80211_vif.
1099          */
1100         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1101
1102         /*
1103          * Determine which operating modes are supported, all modes
1104          * which require beaconing, depend on the availability of
1105          * beacon entries.
1106          */
1107         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
1108         if (rt2x00dev->ops->bcn->entry_num > 0)
1109                 rt2x00dev->hw->wiphy->interface_modes |=
1110                     BIT(NL80211_IFTYPE_ADHOC) |
1111                     BIT(NL80211_IFTYPE_AP) |
1112                     BIT(NL80211_IFTYPE_MESH_POINT) |
1113                     BIT(NL80211_IFTYPE_WDS);
1114
1115         /*
1116          * Initialize work.
1117          */
1118         rt2x00dev->workqueue =
1119             alloc_ordered_workqueue(wiphy_name(rt2x00dev->hw->wiphy), 0);
1120         if (!rt2x00dev->workqueue) {
1121                 retval = -ENOMEM;
1122                 goto exit;
1123         }
1124
1125         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1126         INIT_DELAYED_WORK(&rt2x00dev->autowakeup_work, rt2x00lib_autowakeup);
1127         INIT_WORK(&rt2x00dev->sleep_work, rt2x00lib_sleep);
1128
1129         /*
1130          * Let the driver probe the device to detect the capabilities.
1131          */
1132         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1133         if (retval) {
1134                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1135                 goto exit;
1136         }
1137
1138         /*
1139          * Allocate queue array.
1140          */
1141         retval = rt2x00queue_allocate(rt2x00dev);
1142         if (retval)
1143                 goto exit;
1144
1145         /*
1146          * Initialize ieee80211 structure.
1147          */
1148         retval = rt2x00lib_probe_hw(rt2x00dev);
1149         if (retval) {
1150                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1151                 goto exit;
1152         }
1153
1154         /*
1155          * Register extra components.
1156          */
1157         rt2x00link_register(rt2x00dev);
1158         rt2x00leds_register(rt2x00dev);
1159         rt2x00debug_register(rt2x00dev);
1160
1161         return 0;
1162
1163 exit:
1164         rt2x00lib_remove_dev(rt2x00dev);
1165
1166         return retval;
1167 }
1168 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1169
1170 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1171 {
1172         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1173
1174         /*
1175          * Disable radio.
1176          */
1177         rt2x00lib_disable_radio(rt2x00dev);
1178
1179         /*
1180          * Stop all work.
1181          */
1182         cancel_work_sync(&rt2x00dev->intf_work);
1183         cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
1184         cancel_work_sync(&rt2x00dev->sleep_work);
1185         if (rt2x00_is_usb(rt2x00dev)) {
1186                 del_timer_sync(&rt2x00dev->txstatus_timer);
1187                 cancel_work_sync(&rt2x00dev->rxdone_work);
1188                 cancel_work_sync(&rt2x00dev->txdone_work);
1189         }
1190         destroy_workqueue(rt2x00dev->workqueue);
1191
1192         /*
1193          * Free the tx status fifo.
1194          */
1195         kfifo_free(&rt2x00dev->txstatus_fifo);
1196
1197         /*
1198          * Kill the tx status tasklet.
1199          */
1200         tasklet_kill(&rt2x00dev->txstatus_tasklet);
1201         tasklet_kill(&rt2x00dev->pretbtt_tasklet);
1202         tasklet_kill(&rt2x00dev->tbtt_tasklet);
1203         tasklet_kill(&rt2x00dev->rxdone_tasklet);
1204         tasklet_kill(&rt2x00dev->autowake_tasklet);
1205
1206         /*
1207          * Uninitialize device.
1208          */
1209         rt2x00lib_uninitialize(rt2x00dev);
1210
1211         /*
1212          * Free extra components
1213          */
1214         rt2x00debug_deregister(rt2x00dev);
1215         rt2x00leds_unregister(rt2x00dev);
1216
1217         /*
1218          * Free ieee80211_hw memory.
1219          */
1220         rt2x00lib_remove_hw(rt2x00dev);
1221
1222         /*
1223          * Free firmware image.
1224          */
1225         rt2x00lib_free_firmware(rt2x00dev);
1226
1227         /*
1228          * Free queue structures.
1229          */
1230         rt2x00queue_free(rt2x00dev);
1231 }
1232 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1233
1234 /*
1235  * Device state handlers
1236  */
1237 #ifdef CONFIG_PM
1238 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1239 {
1240         NOTICE(rt2x00dev, "Going to sleep.\n");
1241
1242         /*
1243          * Prevent mac80211 from accessing driver while suspended.
1244          */
1245         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1246                 return 0;
1247
1248         /*
1249          * Cleanup as much as possible.
1250          */
1251         rt2x00lib_uninitialize(rt2x00dev);
1252
1253         /*
1254          * Suspend/disable extra components.
1255          */
1256         rt2x00leds_suspend(rt2x00dev);
1257         rt2x00debug_deregister(rt2x00dev);
1258
1259         /*
1260          * Set device mode to sleep for power management,
1261          * on some hardware this call seems to consistently fail.
1262          * From the specifications it is hard to tell why it fails,
1263          * and if this is a "bad thing".
1264          * Overall it is safe to just ignore the failure and
1265          * continue suspending. The only downside is that the
1266          * device will not be in optimal power save mode, but with
1267          * the radio and the other components already disabled the
1268          * device is as good as disabled.
1269          */
1270         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1271                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1272                         "continue suspending.\n");
1273
1274         return 0;
1275 }
1276 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1277
1278 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1279 {
1280         NOTICE(rt2x00dev, "Waking up.\n");
1281
1282         /*
1283          * Restore/enable extra components.
1284          */
1285         rt2x00debug_register(rt2x00dev);
1286         rt2x00leds_resume(rt2x00dev);
1287
1288         /*
1289          * We are ready again to receive requests from mac80211.
1290          */
1291         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1292
1293         return 0;
1294 }
1295 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1296 #endif /* CONFIG_PM */
1297
1298 /*
1299  * rt2x00lib module information.
1300  */
1301 MODULE_AUTHOR(DRV_PROJECT);
1302 MODULE_VERSION(DRV_VERSION);
1303 MODULE_DESCRIPTION("rt2x00 library");
1304 MODULE_LICENSE("GPL");