drivers/net/wireless/ralink/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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /*
  21         Module: rt2x00lib
  22         Abstract: rt2x00 generic device routines.
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/slab.h>
  28 #include <linux/log2.h>
  29 #include <linux/of.h>
  30 #include <linux/of_net.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
  91         /*
  92          * Start watchdog monitoring.
  93          */
  94         rt2x00link_start_watchdog(rt2x00dev);
  95
  96         return 0;
  97 }
  98
  99 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
 100 {
 101         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 102                 return;
 103
 104         /*
 105          * Stop watchdog monitoring.
 106          */
 107         rt2x00link_stop_watchdog(rt2x00dev);
 108
 109         /*
 110          * Stop all queues
 111          */
 112         rt2x00link_stop_tuner(rt2x00dev);
 113         rt2x00queue_stop_queues(rt2x00dev);
 114         rt2x00queue_flush_queues(rt2x00dev, true);
 115
 116         /*
 117          * Disable radio.
 118          */
 119         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 120         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 121         rt2x00led_led_activity(rt2x00dev, false);
 122         rt2x00leds_led_radio(rt2x00dev, false);
 123 }
 124
 125 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 126                                           struct ieee80211_vif *vif)
 127 {
 128         struct rt2x00_dev *rt2x00dev = data;
 129         struct rt2x00_intf *intf = vif_to_intf(vif);
 130
 131         /*
 132          * It is possible the radio was disabled while the work had been
 133          * scheduled. If that happens we should return here immediately,
 134          * note that in the spinlock protected area above the delayed_flags
 135          * have been cleared correctly.
 136          */
 137         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 138                 return;
 139
 140         if (test_and_clear_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags)) {
 141                 mutex_lock(&intf->beacon_skb_mutex);
 142                 rt2x00queue_update_beacon(rt2x00dev, vif);
 143                 mutex_unlock(&intf->beacon_skb_mutex);
 144         }
 145 }
 146
 147 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 148 {
 149         struct rt2x00_dev *rt2x00dev =
 150             container_of(work, struct rt2x00_dev, intf_work);
 151
 152         /*
 153          * Iterate over each interface and perform the
 154          * requested configurations.
 155          */
 156         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 157                                             IEEE80211_IFACE_ITER_RESUME_ALL,
 158                                             rt2x00lib_intf_scheduled_iter,
 159                                             rt2x00dev);
 160 }
 161
 162 static void rt2x00lib_autowakeup(struct work_struct *work)
 163 {
 164         struct rt2x00_dev *rt2x00dev =
 165             container_of(work, struct rt2x00_dev, autowakeup_work.work);
 166
 167         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 168                 return;
 169
 170         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_AWAKE))
 171                 rt2x00_err(rt2x00dev, "Device failed to wakeup\n");
 172         clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
 173 }
 174
 175 /*
 176  * Interrupt context handlers.
 177  */
 178 static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac,
 179                                      struct ieee80211_vif *vif)
 180 {
 181         struct ieee80211_tx_control control = {};
 182         struct rt2x00_dev *rt2x00dev = data;
 183         struct sk_buff *skb;
 184
 185         /*
 186          * Only AP mode interfaces do broad- and multicast buffering
 187          */
 188         if (vif->type != NL80211_IFTYPE_AP)
 189                 return;
 190
 191         /*
 192          * Send out buffered broad- and multicast frames
 193          */
 194         skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 195         while (skb) {
 196                 rt2x00mac_tx(rt2x00dev->hw, &control, skb);
 197                 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 198         }
 199 }
 200
 201 static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac,
 202                                         struct ieee80211_vif *vif)
 203 {
 204         struct rt2x00_dev *rt2x00dev = data;
 205
 206         if (vif->type != NL80211_IFTYPE_AP &&
 207             vif->type != NL80211_IFTYPE_ADHOC &&
 208             vif->type != NL80211_IFTYPE_MESH_POINT &&
 209             vif->type != NL80211_IFTYPE_WDS)
 210                 return;
 211
 212         /*
 213          * Update the beacon without locking. This is safe on PCI devices
 214          * as they only update the beacon periodically here. This should
 215          * never be called for USB devices.
 216          */
 217         WARN_ON(rt2x00_is_usb(rt2x00dev));
 218         rt2x00queue_update_beacon(rt2x00dev, vif);
 219 }
 220
 221 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 222 {
 223         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 224                 return;
 225
 226         /* send buffered bc/mc frames out for every bssid */
 227         ieee80211_iterate_active_interfaces_atomic(
 228                 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 229                 rt2x00lib_bc_buffer_iter, rt2x00dev);
 230         /*
 231          * Devices with pre tbtt interrupt don't need to update the beacon
 232          * here as they will fetch the next beacon directly prior to
 233          * transmission.
 234          */
 235         if (rt2x00_has_cap_pre_tbtt_interrupt(rt2x00dev))
 236                 return;
 237
 238         /* fetch next beacon */
 239         ieee80211_iterate_active_interfaces_atomic(
 240                 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 241                 rt2x00lib_beaconupdate_iter, rt2x00dev);
 242 }
 243 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 244
 245 void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev)
 246 {
 247         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 248                 return;
 249
 250         /* fetch next beacon */
 251         ieee80211_iterate_active_interfaces_atomic(
 252                 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 253                 rt2x00lib_beaconupdate_iter, rt2x00dev);
 254 }
 255 EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
 256
 257 void rt2x00lib_dmastart(struct queue_entry *entry)
 258 {
 259         set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 260         rt2x00queue_index_inc(entry, Q_INDEX);
 261 }
 262 EXPORT_SYMBOL_GPL(rt2x00lib_dmastart);
 263
 264 void rt2x00lib_dmadone(struct queue_entry *entry)
 265 {
 266         set_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags);
 267         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 268         rt2x00queue_index_inc(entry, Q_INDEX_DMA_DONE);
 269 }
 270 EXPORT_SYMBOL_GPL(rt2x00lib_dmadone);
 271
 272 static inline int rt2x00lib_txdone_bar_status(struct queue_entry *entry)
 273 {
 274         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 275         struct ieee80211_bar *bar = (void *) entry->skb->data;
 276         struct rt2x00_bar_list_entry *bar_entry;
 277         int ret;
 278
 279         if (likely(!ieee80211_is_back_req(bar->frame_control)))
 280                 return 0;
 281
 282         /*
 283          * Unlike all other frames, the status report for BARs does
 284          * not directly come from the hardware as it is incapable of
 285          * matching a BA to a previously send BAR. The hardware will
 286          * report all BARs as if they weren't acked at all.
 287          *
 288          * Instead the RX-path will scan for incoming BAs and set the
 289          * block_acked flag if it sees one that was likely caused by
 290          * a BAR from us.
 291          *
 292          * Remove remaining BARs here and return their status for
 293          * TX done processing.
 294          */
 295         ret = 0;
 296         rcu_read_lock();
 297         list_for_each_entry_rcu(bar_entry, &rt2x00dev->bar_list, list) {
 298                 if (bar_entry->entry != entry)
 299                         continue;
 300
 301                 spin_lock_bh(&rt2x00dev->bar_list_lock);
 302                 /* Return whether this BAR was blockacked or not */
 303                 ret = bar_entry->block_acked;
 304                 /* Remove the BAR from our checklist */
 305                 list_del_rcu(&bar_entry->list);
 306                 spin_unlock_bh(&rt2x00dev->bar_list_lock);
 307                 kfree_rcu(bar_entry, head);
 308
 309                 break;
 310         }
 311         rcu_read_unlock();
 312
 313         return ret;
 314 }
 315
 316 static void rt2x00lib_fill_tx_status(struct rt2x00_dev *rt2x00dev,
 317                                      struct ieee80211_tx_info *tx_info,
 318                                      struct skb_frame_desc *skbdesc,
 319                                      struct txdone_entry_desc *txdesc,
 320                                      bool success)
 321 {
 322         u8 rate_idx, rate_flags, retry_rates;
 323         int i;
 324
 325         rate_idx = skbdesc->tx_rate_idx;
 326         rate_flags = skbdesc->tx_rate_flags;
 327         retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
 328             (txdesc->retry + 1) : 1;
 329
 330         /*
 331          * Initialize TX status
 332          */
 333         memset(&tx_info->status, 0, sizeof(tx_info->status));
 334         tx_info->status.ack_signal = 0;
 335
 336         /*
 337          * Frame was send with retries, hardware tried
 338          * different rates to send out the frame, at each
 339          * retry it lowered the rate 1 step except when the
 340          * lowest rate was used.
 341          */
 342         for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
 343                 tx_info->status.rates[i].idx = rate_idx - i;
 344                 tx_info->status.rates[i].flags = rate_flags;
 345
 346                 if (rate_idx - i == 0) {
 347                         /*
 348                          * The lowest rate (index 0) was used until the
 349                          * number of max retries was reached.
 350                          */
 351                         tx_info->status.rates[i].count = retry_rates - i;
 352                         i++;
 353                         break;
 354                 }
 355                 tx_info->status.rates[i].count = 1;
 356         }
 357         if (i < (IEEE80211_TX_MAX_RATES - 1))
 358                 tx_info->status.rates[i].idx = -1; /* terminate */
 359
 360         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 361                 if (success)
 362                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 363                 else
 364                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 365         }
 366
 367         /*
 368          * Every single frame has it's own tx status, hence report
 369          * every frame as ampdu of size 1.
 370          *
 371          * TODO: if we can find out how many frames were aggregated
 372          * by the hw we could provide the real ampdu_len to mac80211
 373          * which would allow the rc algorithm to better decide on
 374          * which rates are suitable.
 375          */
 376         if (test_bit(TXDONE_AMPDU, &txdesc->flags) ||
 377             tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 378                 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
 379                 tx_info->status.ampdu_len = 1;
 380                 tx_info->status.ampdu_ack_len = success ? 1 : 0;
 381
 382                 if (!success)
 383                         tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
 384         }
 385
 386         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 387                 if (success)
 388                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 389                 else
 390                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 391         }
 392 }
 393
 394 static void rt2x00lib_clear_entry(struct rt2x00_dev *rt2x00dev,
 395                                   struct queue_entry *entry)
 396 {
 397         /*
 398          * Make this entry available for reuse.
 399          */
 400         entry->skb = NULL;
 401         entry->flags = 0;
 402
 403         rt2x00dev->ops->lib->clear_entry(entry);
 404
 405         rt2x00queue_index_inc(entry, Q_INDEX_DONE);
 406
 407         /*
 408          * If the data queue was below the threshold before the txdone
 409          * handler we must make sure the packet queue in the mac80211 stack
 410          * is reenabled when the txdone handler has finished. This has to be
 411          * serialized with rt2x00mac_tx(), otherwise we can wake up queue
 412          * before it was stopped.
 413          */
 414         spin_lock_bh(&entry->queue->tx_lock);
 415         if (!rt2x00queue_threshold(entry->queue))
 416                 rt2x00queue_unpause_queue(entry->queue);
 417         spin_unlock_bh(&entry->queue->tx_lock);
 418 }
 419
 420 void rt2x00lib_txdone(struct queue_entry *entry,
 421                       struct txdone_entry_desc *txdesc)
 422 {
 423         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 424         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 425         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 426         u8 skbdesc_flags = skbdesc->flags;
 427         unsigned int header_length;
 428         bool success;
 429
 430         /*
 431          * Unmap the skb.
 432          */
 433         rt2x00queue_unmap_skb(entry);
 434
 435         /*
 436          * Remove the extra tx headroom from the skb.
 437          */
 438         skb_pull(entry->skb, rt2x00dev->extra_tx_headroom);
 439
 440         /*
 441          * Signal that the TX descriptor is no longer in the skb.
 442          */
 443         skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
 444
 445         /*
 446          * Determine the length of 802.11 header.
 447          */
 448         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 449
 450         /*
 451          * Remove L2 padding which was added during
 452          */
 453         if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_L2PAD))
 454                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 455
 456         /*
 457          * If the IV/EIV data was stripped from the frame before it was
 458          * passed to the hardware, we should now reinsert it again because
 459          * mac80211 will expect the same data to be present it the
 460          * frame as it was passed to us.
 461          */
 462         if (rt2x00_has_cap_hw_crypto(rt2x00dev))
 463                 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
 464
 465         /*
 466          * Send frame to debugfs immediately, after this call is completed
 467          * we are going to overwrite the skb->cb array.
 468          */
 469         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry);
 470
 471         /*
 472          * Determine if the frame has been successfully transmitted and
 473          * remove BARs from our check list while checking for their
 474          * TX status.
 475          */
 476         success =
 477             rt2x00lib_txdone_bar_status(entry) ||
 478             test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 479             test_bit(TXDONE_UNKNOWN, &txdesc->flags);
 480
 481         /*
 482          * Update TX statistics.
 483          */
 484         rt2x00dev->link.qual.tx_success += success;
 485         rt2x00dev->link.qual.tx_failed += !success;
 486
 487         rt2x00lib_fill_tx_status(rt2x00dev, tx_info, skbdesc, txdesc, success);
 488
 489         /*
 490          * Only send the status report to mac80211 when it's a frame
 491          * that originated in mac80211. If this was a extra frame coming
 492          * through a mac80211 library call (RTS/CTS) then we should not
 493          * send the status report back.
 494          */
 495         if (!(skbdesc_flags & SKBDESC_NOT_MAC80211)) {
 496                 if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TASKLET_CONTEXT))
 497                         ieee80211_tx_status(rt2x00dev->hw, entry->skb);
 498                 else
 499                         ieee80211_tx_status_ni(rt2x00dev->hw, entry->skb);
 500         } else {
 501                 dev_kfree_skb_any(entry->skb);
 502         }
 503
 504         rt2x00lib_clear_entry(rt2x00dev, entry);
 505 }
 506 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 507
 508 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
 509 {
 510         struct txdone_entry_desc txdesc;
 511
 512         txdesc.flags = 0;
 513         __set_bit(status, &txdesc.flags);
 514         txdesc.retry = 0;
 515
 516         rt2x00lib_txdone(entry, &txdesc);
 517 }
 518 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
 519
 520 static u8 *rt2x00lib_find_ie(u8 *data, unsigned int len, u8 ie)
 521 {
 522         struct ieee80211_mgmt *mgmt = (void *)data;
 523         u8 *pos, *end;
 524
 525         pos = (u8 *)mgmt->u.beacon.variable;
 526         end = data + len;
 527         while (pos < end) {
 528                 if (pos + 2 + pos[1] > end)
 529                         return NULL;
 530
 531                 if (pos[0] == ie)
 532                         return pos;
 533
 534                 pos += 2 + pos[1];
 535         }
 536
 537         return NULL;
 538 }
 539
 540 static void rt2x00lib_sleep(struct work_struct *work)
 541 {
 542         struct rt2x00_dev *rt2x00dev =
 543             container_of(work, struct rt2x00_dev, sleep_work);
 544
 545         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 546                 return;
 547
 548         /*
 549          * Check again is powersaving is enabled, to prevent races from delayed
 550          * work execution.
 551          */
 552         if (!test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 553                 rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf,
 554                                  IEEE80211_CONF_CHANGE_PS);
 555 }
 556
 557 static void rt2x00lib_rxdone_check_ba(struct rt2x00_dev *rt2x00dev,
 558                                       struct sk_buff *skb,
 559                                       struct rxdone_entry_desc *rxdesc)
 560 {
 561         struct rt2x00_bar_list_entry *entry;
 562         struct ieee80211_bar *ba = (void *)skb->data;
 563
 564         if (likely(!ieee80211_is_back(ba->frame_control)))
 565                 return;
 566
 567         if (rxdesc->size < sizeof(*ba) + FCS_LEN)
 568                 return;
 569
 570         rcu_read_lock();
 571         list_for_each_entry_rcu(entry, &rt2x00dev->bar_list, list) {
 572
 573                 if (ba->start_seq_num != entry->start_seq_num)
 574                         continue;
 575
 576 #define TID_CHECK(a, b) (                                               \
 577         ((a) & cpu_to_le16(IEEE80211_BAR_CTRL_TID_INFO_MASK)) ==        \
 578         ((b) & cpu_to_le16(IEEE80211_BAR_CTRL_TID_INFO_MASK)))          \
 579
 580                 if (!TID_CHECK(ba->control, entry->control))
 581                         continue;
 582
 583 #undef TID_CHECK
 584
 585                 if (!ether_addr_equal_64bits(ba->ra, entry->ta))
 586                         continue;
 587
 588                 if (!ether_addr_equal_64bits(ba->ta, entry->ra))
 589                         continue;
 590
 591                 /* Mark BAR since we received the according BA */
 592                 spin_lock_bh(&rt2x00dev->bar_list_lock);
 593                 entry->block_acked = 1;
 594                 spin_unlock_bh(&rt2x00dev->bar_list_lock);
 595                 break;
 596         }
 597         rcu_read_unlock();
 598
 599 }
 600
 601 static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev,
 602                                       struct sk_buff *skb,
 603                                       struct rxdone_entry_desc *rxdesc)
 604 {
 605         struct ieee80211_hdr *hdr = (void *) skb->data;
 606         struct ieee80211_tim_ie *tim_ie;
 607         u8 *tim;
 608         u8 tim_len;
 609         bool cam;
 610
 611         /* If this is not a beacon, or if mac80211 has no powersaving
 612          * configured, or if the device is already in powersaving mode
 613          * we can exit now. */
 614         if (likely(!ieee80211_is_beacon(hdr->frame_control) ||
 615                    !(rt2x00dev->hw->conf.flags & IEEE80211_CONF_PS)))
 616                 return;
 617
 618         /* min. beacon length + FCS_LEN */
 619         if (skb->len <= 40 + FCS_LEN)
 620                 return;
 621
 622         /* and only beacons from the associated BSSID, please */
 623         if (!(rxdesc->dev_flags & RXDONE_MY_BSS) ||
 624             !rt2x00dev->aid)
 625                 return;
 626
 627         rt2x00dev->last_beacon = jiffies;
 628
 629         tim = rt2x00lib_find_ie(skb->data, skb->len - FCS_LEN, WLAN_EID_TIM);
 630         if (!tim)
 631                 return;
 632
 633         if (tim[1] < sizeof(*tim_ie))
 634                 return;
 635
 636         tim_len = tim[1];
 637         tim_ie = (struct ieee80211_tim_ie *) &tim[2];
 638
 639         /* Check whenever the PHY can be turned off again. */
 640
 641         /* 1. What about buffered unicast traffic for our AID? */
 642         cam = ieee80211_check_tim(tim_ie, tim_len, rt2x00dev->aid);
 643
 644         /* 2. Maybe the AP wants to send multicast/broadcast data? */
 645         cam |= (tim_ie->bitmap_ctrl & 0x01);
 646
 647         if (!cam && !test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 648                 queue_work(rt2x00dev->workqueue, &rt2x00dev->sleep_work);
 649 }
 650
 651 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 652                                         struct rxdone_entry_desc *rxdesc)
 653 {
 654         struct ieee80211_supported_band *sband;
 655         const struct rt2x00_rate *rate;
 656         unsigned int i;
 657         int signal = rxdesc->signal;
 658         int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 659
 660         switch (rxdesc->rate_mode) {
 661         case RATE_MODE_CCK:
 662         case RATE_MODE_OFDM:
 663                 /*
 664                  * For non-HT rates the MCS value needs to contain the
 665                  * actually used rate modulation (CCK or OFDM).
 666                  */
 667                 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 668                         signal = RATE_MCS(rxdesc->rate_mode, signal);
 669
 670                 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 671                 for (i = 0; i < sband->n_bitrates; i++) {
 672                         rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 673                         if (((type == RXDONE_SIGNAL_PLCP) &&
 674                              (rate->plcp == signal)) ||
 675                             ((type == RXDONE_SIGNAL_BITRATE) &&
 676                               (rate->bitrate == signal)) ||
 677                             ((type == RXDONE_SIGNAL_MCS) &&
 678                               (rate->mcs == signal))) {
 679                                 return i;
 680                         }
 681                 }
 682                 break;
 683         case RATE_MODE_HT_MIX:
 684         case RATE_MODE_HT_GREENFIELD:
 685                 if (signal >= 0 && signal <= 76)
 686                         return signal;
 687                 break;
 688         default:
 689                 break;
 690         }
 691
 692         rt2x00_warn(rt2x00dev, "Frame received with unrecognized signal, mode=0x%.4x, signal=0x%.4x, type=%d\n",
 693                     rxdesc->rate_mode, signal, type);
 694         return 0;
 695 }
 696
 697 void rt2x00lib_rxdone(struct queue_entry *entry, gfp_t gfp)
 698 {
 699         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 700         struct rxdone_entry_desc rxdesc;
 701         struct sk_buff *skb;
 702         struct ieee80211_rx_status *rx_status;
 703         unsigned int header_length;
 704         int rate_idx;
 705
 706         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 707             !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 708                 goto submit_entry;
 709
 710         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 711                 goto submit_entry;
 712
 713         /*
 714          * Allocate a new sk_buffer. If no new buffer available, drop the
 715          * received frame and reuse the existing buffer.
 716          */
 717         skb = rt2x00queue_alloc_rxskb(entry, gfp);
 718         if (!skb)
 719                 goto submit_entry;
 720
 721         /*
 722          * Unmap the skb.
 723          */
 724         rt2x00queue_unmap_skb(entry);
 725
 726         /*
 727          * Extract the RXD details.
 728          */
 729         memset(&rxdesc, 0, sizeof(rxdesc));
 730         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 731
 732         /*
 733          * Check for valid size in case we get corrupted descriptor from
 734          * hardware.
 735          */
 736         if (unlikely(rxdesc.size == 0 ||
 737                      rxdesc.size > entry->queue->data_size)) {
 738                 rt2x00_err(rt2x00dev, "Wrong frame size %d max %d\n",
 739                            rxdesc.size, entry->queue->data_size);
 740                 dev_kfree_skb(entry->skb);
 741                 goto renew_skb;
 742         }
 743
 744         /*
 745          * The data behind the ieee80211 header must be
 746          * aligned on a 4 byte boundary.
 747          */
 748         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 749
 750         /*
 751          * Hardware might have stripped the IV/EIV/ICV data,
 752          * in that case it is possible that the data was
 753          * provided separately (through hardware descriptor)
 754          * in which case we should reinsert the data into the frame.
 755          */
 756         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 757             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 758                 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
 759                                           &rxdesc);
 760         else if (header_length &&
 761                  (rxdesc.size > header_length) &&
 762                  (rxdesc.dev_flags & RXDONE_L2PAD))
 763                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 764
 765         /* Trim buffer to correct size */
 766         skb_trim(entry->skb, rxdesc.size);
 767
 768         /*
 769          * Translate the signal to the correct bitrate index.
 770          */
 771         rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 772         if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
 773             rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
 774                 rxdesc.flags |= RX_FLAG_HT;
 775
 776         /*
 777          * Check if this is a beacon, and more frames have been
 778          * buffered while we were in powersaving mode.
 779          */
 780         rt2x00lib_rxdone_check_ps(rt2x00dev, entry->skb, &rxdesc);
 781
 782         /*
 783          * Check for incoming BlockAcks to match to the BlockAckReqs
 784          * we've send out.
 785          */
 786         rt2x00lib_rxdone_check_ba(rt2x00dev, entry->skb, &rxdesc);
 787
 788         /*
 789          * Update extra components
 790          */
 791         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 792         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 793         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry);
 794
 795         /*
 796          * Initialize RX status information, and send frame
 797          * to mac80211.
 798          */
 799         rx_status = IEEE80211_SKB_RXCB(entry->skb);
 800
 801         /* Ensure that all fields of rx_status are initialized
 802          * properly. The skb->cb array was used for driver
 803          * specific informations, so rx_status might contain
 804          * garbage.
 805          */
 806         memset(rx_status, 0, sizeof(*rx_status));
 807
 808         rx_status->mactime = rxdesc.timestamp;
 809         rx_status->band = rt2x00dev->curr_band;
 810         rx_status->freq = rt2x00dev->curr_freq;
 811         rx_status->rate_idx = rate_idx;
 812         rx_status->signal = rxdesc.rssi;
 813         rx_status->flag = rxdesc.flags;
 814         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 815
 816         ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
 817
 818 renew_skb:
 819         /*
 820          * Replace the skb with the freshly allocated one.
 821          */
 822         entry->skb = skb;
 823
 824 submit_entry:
 825         entry->flags = 0;
 826         rt2x00queue_index_inc(entry, Q_INDEX_DONE);
 827         if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
 828             test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 829                 rt2x00dev->ops->lib->clear_entry(entry);
 830 }
 831 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 832
 833 /*
 834  * Driver initialization handlers.
 835  */
 836 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 837         {
 838                 .flags = DEV_RATE_CCK,
 839                 .bitrate = 10,
 840                 .ratemask = BIT(0),
 841                 .plcp = 0x00,
 842                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 843         },
 844         {
 845                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 846                 .bitrate = 20,
 847                 .ratemask = BIT(1),
 848                 .plcp = 0x01,
 849                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 850         },
 851         {
 852                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 853                 .bitrate = 55,
 854                 .ratemask = BIT(2),
 855                 .plcp = 0x02,
 856                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 857         },
 858         {
 859                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 860                 .bitrate = 110,
 861                 .ratemask = BIT(3),
 862                 .plcp = 0x03,
 863                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 864         },
 865         {
 866                 .flags = DEV_RATE_OFDM,
 867                 .bitrate = 60,
 868                 .ratemask = BIT(4),
 869                 .plcp = 0x0b,
 870                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 871         },
 872         {
 873                 .flags = DEV_RATE_OFDM,
 874                 .bitrate = 90,
 875                 .ratemask = BIT(5),
 876                 .plcp = 0x0f,
 877                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 878         },
 879         {
 880                 .flags = DEV_RATE_OFDM,
 881                 .bitrate = 120,
 882                 .ratemask = BIT(6),
 883                 .plcp = 0x0a,
 884                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 885         },
 886         {
 887                 .flags = DEV_RATE_OFDM,
 888                 .bitrate = 180,
 889                 .ratemask = BIT(7),
 890                 .plcp = 0x0e,
 891                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 892         },
 893         {
 894                 .flags = DEV_RATE_OFDM,
 895                 .bitrate = 240,
 896                 .ratemask = BIT(8),
 897                 .plcp = 0x09,
 898                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 899         },
 900         {
 901                 .flags = DEV_RATE_OFDM,
 902                 .bitrate = 360,
 903                 .ratemask = BIT(9),
 904                 .plcp = 0x0d,
 905                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 906         },
 907         {
 908                 .flags = DEV_RATE_OFDM,
 909                 .bitrate = 480,
 910                 .ratemask = BIT(10),
 911                 .plcp = 0x08,
 912                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 913         },
 914         {
 915                 .flags = DEV_RATE_OFDM,
 916                 .bitrate = 540,
 917                 .ratemask = BIT(11),
 918                 .plcp = 0x0c,
 919                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 920         },
 921 };
 922
 923 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 924                               const int channel, const int tx_power,
 925                               const int value)
 926 {
 927         /* XXX: this assumption about the band is wrong for 802.11j */
 928         entry->band = channel <= 14 ? NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
 929         entry->center_freq = ieee80211_channel_to_frequency(channel,
 930                                                             entry->band);
 931         entry->hw_value = value;
 932         entry->max_power = tx_power;
 933         entry->max_antenna_gain = 0xff;
 934 }
 935
 936 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 937                            const u16 index, const struct rt2x00_rate *rate)
 938 {
 939         entry->flags = 0;
 940         entry->bitrate = rate->bitrate;
 941         entry->hw_value = index;
 942         entry->hw_value_short = index;
 943
 944         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 945                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 946 }
 947
 948 void rt2x00lib_set_mac_address(struct rt2x00_dev *rt2x00dev, u8 *eeprom_mac_addr)
 949 {
 950         const char *mac_addr;
 951
 952         mac_addr = of_get_mac_address(rt2x00dev->dev->of_node);
 953         if (mac_addr)
 954                 ether_addr_copy(eeprom_mac_addr, mac_addr);
 955
 956         if (!is_valid_ether_addr(eeprom_mac_addr)) {
 957                 eth_random_addr(eeprom_mac_addr);
 958                 rt2x00_eeprom_dbg(rt2x00dev, "MAC: %pM\n", eeprom_mac_addr);
 959         }
 960 }
 961 EXPORT_SYMBOL_GPL(rt2x00lib_set_mac_address);
 962
 963 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 964                                     struct hw_mode_spec *spec)
 965 {
 966         struct ieee80211_hw *hw = rt2x00dev->hw;
 967         struct ieee80211_channel *channels;
 968         struct ieee80211_rate *rates;
 969         unsigned int num_rates;
 970         unsigned int i;
 971
 972         num_rates = 0;
 973         if (spec->supported_rates & SUPPORT_RATE_CCK)
 974                 num_rates += 4;
 975         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 976                 num_rates += 8;
 977
 978         channels = kcalloc(spec->num_channels, sizeof(*channels), GFP_KERNEL);
 979         if (!channels)
 980                 return -ENOMEM;
 981
 982         rates = kcalloc(num_rates, sizeof(*rates), GFP_KERNEL);
 983         if (!rates)
 984                 goto exit_free_channels;
 985
 986         /*
 987          * Initialize Rate list.
 988          */
 989         for (i = 0; i < num_rates; i++)
 990                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 991
 992         /*
 993          * Initialize Channel list.
 994          */
 995         for (i = 0; i < spec->num_channels; i++) {
 996                 rt2x00lib_channel(&channels[i],
 997                                   spec->channels[i].channel,
 998                                   spec->channels_info[i].max_power, i);
 999         }
1000
1001         /*
1002          * Intitialize 802.11b, 802.11g
1003          * Rates: CCK, OFDM.
1004          * Channels: 2.4 GHz
1005          */
1006         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
1007                 rt2x00dev->bands[NL80211_BAND_2GHZ].n_channels = 14;
1008                 rt2x00dev->bands[NL80211_BAND_2GHZ].n_bitrates = num_rates;
1009                 rt2x00dev->bands[NL80211_BAND_2GHZ].channels = channels;
1010                 rt2x00dev->bands[NL80211_BAND_2GHZ].bitrates = rates;
1011                 hw->wiphy->bands[NL80211_BAND_2GHZ] =
1012                     &rt2x00dev->bands[NL80211_BAND_2GHZ];
1013                 memcpy(&rt2x00dev->bands[NL80211_BAND_2GHZ].ht_cap,
1014                        &spec->ht, sizeof(spec->ht));
1015         }
1016
1017         /*
1018          * Intitialize 802.11a
1019          * Rates: OFDM.
1020          * Channels: OFDM, UNII, HiperLAN2.
1021          */
1022         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
1023                 rt2x00dev->bands[NL80211_BAND_5GHZ].n_channels =
1024                     spec->num_channels - 14;
1025                 rt2x00dev->bands[NL80211_BAND_5GHZ].n_bitrates =
1026                     num_rates - 4;
1027                 rt2x00dev->bands[NL80211_BAND_5GHZ].channels = &channels[14];
1028                 rt2x00dev->bands[NL80211_BAND_5GHZ].bitrates = &rates[4];
1029                 hw->wiphy->bands[NL80211_BAND_5GHZ] =
1030                     &rt2x00dev->bands[NL80211_BAND_5GHZ];
1031                 memcpy(&rt2x00dev->bands[NL80211_BAND_5GHZ].ht_cap,
1032                        &spec->ht, sizeof(spec->ht));
1033         }
1034
1035         return 0;
1036
1037  exit_free_channels:
1038         kfree(channels);
1039         rt2x00_err(rt2x00dev, "Allocation ieee80211 modes failed\n");
1040         return -ENOMEM;
1041 }
1042
1043 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
1044 {
1045         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
1046                 ieee80211_unregister_hw(rt2x00dev->hw);
1047
1048         if (likely(rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ])) {
1049                 kfree(rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ]->channels);
1050                 kfree(rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ]->bitrates);
1051                 rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ] = NULL;
1052                 rt2x00dev->hw->wiphy->bands[NL80211_BAND_5GHZ] = NULL;
1053         }
1054
1055         kfree(rt2x00dev->spec.channels_info);
1056 }
1057
1058 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
1059 {
1060         struct hw_mode_spec *spec = &rt2x00dev->spec;
1061         int status;
1062
1063         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
1064                 return 0;
1065
1066         /*
1067          * Initialize HW modes.
1068          */
1069         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
1070         if (status)
1071                 return status;
1072
1073         /*
1074          * Initialize HW fields.
1075          */
1076         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
1077
1078         /*
1079          * Initialize extra TX headroom required.
1080          */
1081         rt2x00dev->hw->extra_tx_headroom =
1082                 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
1083                       rt2x00dev->extra_tx_headroom);
1084
1085         /*
1086          * Take TX headroom required for alignment into account.
1087          */
1088         if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_L2PAD))
1089                 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
1090         else if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DMA))
1091                 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
1092
1093         /*
1094          * Tell mac80211 about the size of our private STA structure.
1095          */
1096         rt2x00dev->hw->sta_data_size = sizeof(struct rt2x00_sta);
1097
1098         /*
1099          * Allocate tx status FIFO for driver use.
1100          */
1101         if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TXSTATUS_FIFO)) {
1102                 /*
1103                  * Allocate the txstatus fifo. In the worst case the tx
1104                  * status fifo has to hold the tx status of all entries
1105                  * in all tx queues. Hence, calculate the kfifo size as
1106                  * tx_queues * entry_num and round up to the nearest
1107                  * power of 2.
1108                  */
1109                 int kfifo_size =
1110                         roundup_pow_of_two(rt2x00dev->ops->tx_queues *
1111                                            rt2x00dev->tx->limit *
1112                                            sizeof(u32));
1113
1114                 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, kfifo_size,
1115                                      GFP_KERNEL);
1116                 if (status)
1117                         return status;
1118         }
1119
1120         /*
1121          * Initialize tasklets if used by the driver. Tasklets are
1122          * disabled until the interrupts are turned on. The driver
1123          * has to handle that.
1124          */
1125 #define RT2X00_TASKLET_INIT(taskletname) \
1126         if (rt2x00dev->ops->lib->taskletname) { \
1127                 tasklet_init(&rt2x00dev->taskletname, \
1128                              rt2x00dev->ops->lib->taskletname, \
1129                              (unsigned long)rt2x00dev); \
1130         }
1131
1132         RT2X00_TASKLET_INIT(txstatus_tasklet);
1133         RT2X00_TASKLET_INIT(pretbtt_tasklet);
1134         RT2X00_TASKLET_INIT(tbtt_tasklet);
1135         RT2X00_TASKLET_INIT(rxdone_tasklet);
1136         RT2X00_TASKLET_INIT(autowake_tasklet);
1137
1138 #undef RT2X00_TASKLET_INIT
1139
1140         /*
1141          * Register HW.
1142          */
1143         status = ieee80211_register_hw(rt2x00dev->hw);
1144         if (status)
1145                 return status;
1146
1147         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
1148
1149         return 0;
1150 }
1151
1152 /*
1153  * Initialization/uninitialization handlers.
1154  */
1155 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
1156 {
1157         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1158                 return;
1159
1160         /*
1161          * Stop rfkill polling.
1162          */
1163         if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
1164                 rt2x00rfkill_unregister(rt2x00dev);
1165
1166         /*
1167          * Allow the HW to uninitialize.
1168          */
1169         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1170
1171         /*
1172          * Free allocated queue entries.
1173          */
1174         rt2x00queue_uninitialize(rt2x00dev);
1175 }
1176
1177 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1178 {
1179         int status;
1180
1181         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1182                 return 0;
1183
1184         /*
1185          * Allocate all queue entries.
1186          */
1187         status = rt2x00queue_initialize(rt2x00dev);
1188         if (status)
1189                 return status;
1190
1191         /*
1192          * Initialize the device.
1193          */
1194         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1195         if (status) {
1196                 rt2x00queue_uninitialize(rt2x00dev);
1197                 return status;
1198         }
1199
1200         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
1201
1202         /*
1203          * Start rfkill polling.
1204          */
1205         if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
1206                 rt2x00rfkill_register(rt2x00dev);
1207
1208         return 0;
1209 }
1210
1211 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1212 {
1213         int retval;
1214
1215         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1216                 return 0;
1217
1218         /*
1219          * If this is the first interface which is added,
1220          * we should load the firmware now.
1221          */
1222         retval = rt2x00lib_load_firmware(rt2x00dev);
1223         if (retval)
1224                 return retval;
1225
1226         /*
1227          * Initialize the device.
1228          */
1229         retval = rt2x00lib_initialize(rt2x00dev);
1230         if (retval)
1231                 return retval;
1232
1233         rt2x00dev->intf_ap_count = 0;
1234         rt2x00dev->intf_sta_count = 0;
1235         rt2x00dev->intf_associated = 0;
1236
1237         /* Enable the radio */
1238         retval = rt2x00lib_enable_radio(rt2x00dev);
1239         if (retval)
1240                 return retval;
1241
1242         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
1243
1244         return 0;
1245 }
1246
1247 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1248 {
1249         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1250                 return;
1251
1252         /*
1253          * Perhaps we can add something smarter here,
1254          * but for now just disabling the radio should do.
1255          */
1256         rt2x00lib_disable_radio(rt2x00dev);
1257
1258         rt2x00dev->intf_ap_count = 0;
1259         rt2x00dev->intf_sta_count = 0;
1260         rt2x00dev->intf_associated = 0;
1261 }
1262
1263 static inline void rt2x00lib_set_if_combinations(struct rt2x00_dev *rt2x00dev)
1264 {
1265         struct ieee80211_iface_limit *if_limit;
1266         struct ieee80211_iface_combination *if_combination;
1267
1268         if (rt2x00dev->ops->max_ap_intf < 2)
1269                 return;
1270
1271         /*
1272          * Build up AP interface limits structure.
1273          */
1274         if_limit = &rt2x00dev->if_limits_ap;
1275         if_limit->max = rt2x00dev->ops->max_ap_intf;
1276         if_limit->types = BIT(NL80211_IFTYPE_AP);
1277 #ifdef CONFIG_MAC80211_MESH
1278         if_limit->types |= BIT(NL80211_IFTYPE_MESH_POINT);
1279 #endif
1280
1281         /*
1282          * Build up AP interface combinations structure.
1283          */
1284         if_combination = &rt2x00dev->if_combinations[IF_COMB_AP];
1285         if_combination->limits = if_limit;
1286         if_combination->n_limits = 1;
1287         if_combination->max_interfaces = if_limit->max;
1288         if_combination->num_different_channels = 1;
1289
1290         /*
1291          * Finally, specify the possible combinations to mac80211.
1292          */
1293         rt2x00dev->hw->wiphy->iface_combinations = rt2x00dev->if_combinations;
1294         rt2x00dev->hw->wiphy->n_iface_combinations = 1;
1295 }
1296
1297 static unsigned int rt2x00dev_extra_tx_headroom(struct rt2x00_dev *rt2x00dev)
1298 {
1299         if (WARN_ON(!rt2x00dev->tx))
1300                 return 0;
1301
1302         if (rt2x00_is_usb(rt2x00dev))
1303                 return rt2x00dev->tx[0].winfo_size + rt2x00dev->tx[0].desc_size;
1304
1305         return rt2x00dev->tx[0].winfo_size;
1306 }
1307
1308 /*
1309  * driver allocation handlers.
1310  */
1311 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1312 {
1313         int retval = -ENOMEM;
1314
1315         /*
1316          * Set possible interface combinations.
1317          */
1318         rt2x00lib_set_if_combinations(rt2x00dev);
1319
1320         /*
1321          * Allocate the driver data memory, if necessary.
1322          */
1323         if (rt2x00dev->ops->drv_data_size > 0) {
1324                 rt2x00dev->drv_data = kzalloc(rt2x00dev->ops->drv_data_size,
1325                                               GFP_KERNEL);
1326                 if (!rt2x00dev->drv_data) {
1327                         retval = -ENOMEM;
1328                         goto exit;
1329                 }
1330         }
1331
1332         spin_lock_init(&rt2x00dev->irqmask_lock);
1333         mutex_init(&rt2x00dev->csr_mutex);
1334         mutex_init(&rt2x00dev->conf_mutex);
1335         INIT_LIST_HEAD(&rt2x00dev->bar_list);
1336         spin_lock_init(&rt2x00dev->bar_list_lock);
1337
1338         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1339
1340         /*
1341          * Make room for rt2x00_intf inside the per-interface
1342          * structure ieee80211_vif.
1343          */
1344         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1345
1346         /*
1347          * rt2x00 devices can only use the last n bits of the MAC address
1348          * for virtual interfaces.
1349          */
1350         rt2x00dev->hw->wiphy->addr_mask[ETH_ALEN - 1] =
1351                 (rt2x00dev->ops->max_ap_intf - 1);
1352
1353         /*
1354          * Initialize work.
1355          */
1356         rt2x00dev->workqueue =
1357             alloc_ordered_workqueue("%s", 0, wiphy_name(rt2x00dev->hw->wiphy));
1358         if (!rt2x00dev->workqueue) {
1359                 retval = -ENOMEM;
1360                 goto exit;
1361         }
1362
1363         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1364         INIT_DELAYED_WORK(&rt2x00dev->autowakeup_work, rt2x00lib_autowakeup);
1365         INIT_WORK(&rt2x00dev->sleep_work, rt2x00lib_sleep);
1366
1367         /*
1368          * Let the driver probe the device to detect the capabilities.
1369          */
1370         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1371         if (retval) {
1372                 rt2x00_err(rt2x00dev, "Failed to allocate device\n");
1373                 goto exit;
1374         }
1375
1376         /*
1377          * Allocate queue array.
1378          */
1379         retval = rt2x00queue_allocate(rt2x00dev);
1380         if (retval)
1381                 goto exit;
1382
1383         /* Cache TX headroom value */
1384         rt2x00dev->extra_tx_headroom = rt2x00dev_extra_tx_headroom(rt2x00dev);
1385
1386         /*
1387          * Determine which operating modes are supported, all modes
1388          * which require beaconing, depend on the availability of
1389          * beacon entries.
1390          */
1391         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
1392         if (rt2x00dev->bcn->limit > 0)
1393                 rt2x00dev->hw->wiphy->interface_modes |=
1394                     BIT(NL80211_IFTYPE_ADHOC) |
1395 #ifdef CONFIG_MAC80211_MESH
1396                     BIT(NL80211_IFTYPE_MESH_POINT) |
1397 #endif
1398 #ifdef CONFIG_WIRELESS_WDS
1399                     BIT(NL80211_IFTYPE_WDS) |
1400 #endif
1401                     BIT(NL80211_IFTYPE_AP);
1402
1403         rt2x00dev->hw->wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
1404
1405         /*
1406          * Initialize ieee80211 structure.
1407          */
1408         retval = rt2x00lib_probe_hw(rt2x00dev);
1409         if (retval) {
1410                 rt2x00_err(rt2x00dev, "Failed to initialize hw\n");
1411                 goto exit;
1412         }
1413
1414         /*
1415          * Register extra components.
1416          */
1417         rt2x00link_register(rt2x00dev);
1418         rt2x00leds_register(rt2x00dev);
1419         rt2x00debug_register(rt2x00dev);
1420
1421         /*
1422          * Start rfkill polling.
1423          */
1424         if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
1425                 rt2x00rfkill_register(rt2x00dev);
1426
1427         return 0;
1428
1429 exit:
1430         rt2x00lib_remove_dev(rt2x00dev);
1431
1432         return retval;
1433 }
1434 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1435
1436 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1437 {
1438         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1439
1440         /*
1441          * Stop rfkill polling.
1442          */
1443         if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
1444                 rt2x00rfkill_unregister(rt2x00dev);
1445
1446         /*
1447          * Disable radio.
1448          */
1449         rt2x00lib_disable_radio(rt2x00dev);
1450
1451         /*
1452          * Stop all work.
1453          */
1454         cancel_work_sync(&rt2x00dev->intf_work);
1455         cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
1456         cancel_work_sync(&rt2x00dev->sleep_work);
1457
1458         /*
1459          * Kill the tx status tasklet.
1460          */
1461         tasklet_kill(&rt2x00dev->txstatus_tasklet);
1462         tasklet_kill(&rt2x00dev->pretbtt_tasklet);
1463         tasklet_kill(&rt2x00dev->tbtt_tasklet);
1464         tasklet_kill(&rt2x00dev->rxdone_tasklet);
1465         tasklet_kill(&rt2x00dev->autowake_tasklet);
1466
1467         /*
1468          * Uninitialize device.
1469          */
1470         rt2x00lib_uninitialize(rt2x00dev);
1471
1472         if (rt2x00dev->workqueue)
1473                 destroy_workqueue(rt2x00dev->workqueue);
1474
1475         /*
1476          * Free the tx status fifo.
1477          */
1478         kfifo_free(&rt2x00dev->txstatus_fifo);
1479
1480         /*
1481          * Free extra components
1482          */
1483         rt2x00debug_deregister(rt2x00dev);
1484         rt2x00leds_unregister(rt2x00dev);
1485
1486         /*
1487          * Free ieee80211_hw memory.
1488          */
1489         rt2x00lib_remove_hw(rt2x00dev);
1490
1491         /*
1492          * Free firmware image.
1493          */
1494         rt2x00lib_free_firmware(rt2x00dev);
1495
1496         /*
1497          * Free queue structures.
1498          */
1499         rt2x00queue_free(rt2x00dev);
1500
1501         /*
1502          * Free the driver data.
1503          */
1504         kfree(rt2x00dev->drv_data);
1505 }
1506 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1507
1508 /*
1509  * Device state handlers
1510  */
1511 #ifdef CONFIG_PM
1512 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1513 {
1514         rt2x00_dbg(rt2x00dev, "Going to sleep\n");
1515
1516         /*
1517          * Prevent mac80211 from accessing driver while suspended.
1518          */
1519         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1520                 return 0;
1521
1522         /*
1523          * Cleanup as much as possible.
1524          */
1525         rt2x00lib_uninitialize(rt2x00dev);
1526
1527         /*
1528          * Suspend/disable extra components.
1529          */
1530         rt2x00leds_suspend(rt2x00dev);
1531         rt2x00debug_deregister(rt2x00dev);
1532
1533         /*
1534          * Set device mode to sleep for power management,
1535          * on some hardware this call seems to consistently fail.
1536          * From the specifications it is hard to tell why it fails,
1537          * and if this is a "bad thing".
1538          * Overall it is safe to just ignore the failure and
1539          * continue suspending. The only downside is that the
1540          * device will not be in optimal power save mode, but with
1541          * the radio and the other components already disabled the
1542          * device is as good as disabled.
1543          */
1544         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1545                 rt2x00_warn(rt2x00dev, "Device failed to enter sleep state, continue suspending\n");
1546
1547         return 0;
1548 }
1549 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1550
1551 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1552 {
1553         rt2x00_dbg(rt2x00dev, "Waking up\n");
1554
1555         /*
1556          * Restore/enable extra components.
1557          */
1558         rt2x00debug_register(rt2x00dev);
1559         rt2x00leds_resume(rt2x00dev);
1560
1561         /*
1562          * We are ready again to receive requests from mac80211.
1563          */
1564         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1565
1566         return 0;
1567 }
1568 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1569 #endif /* CONFIG_PM */
1570
1571 /*
1572  * rt2x00lib module information.
1573  */
1574 MODULE_AUTHOR(DRV_PROJECT);
1575 MODULE_VERSION(DRV_VERSION);
1576 MODULE_DESCRIPTION("rt2x00 library");
1577 MODULE_LICENSE("GPL");