drivers/net/wireless/ralink/rt2x00/rt2x00dev.c

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This source file includes following definitions.
rt2x00lib_get_bssidx
rt2x00lib_enable_radio
rt2x00lib_disable_radio
rt2x00lib_intf_scheduled_iter
rt2x00lib_intf_scheduled
rt2x00lib_autowakeup
rt2x00lib_bc_buffer_iter
rt2x00lib_beaconupdate_iter
rt2x00lib_beacondone
rt2x00lib_pretbtt
rt2x00lib_dmastart
rt2x00lib_dmadone
rt2x00lib_txdone_bar_status
rt2x00lib_fill_tx_status
rt2x00lib_clear_entry
rt2x00lib_txdone_nomatch
rt2x00lib_txdone
rt2x00lib_txdone_noinfo
rt2x00lib_find_ie
rt2x00lib_sleep
rt2x00lib_rxdone_check_ba
rt2x00lib_rxdone_check_ps
rt2x00lib_rxdone_read_signal
rt2x00lib_rxdone
rt2x00lib_channel
rt2x00lib_rate
rt2x00lib_set_mac_address
rt2x00lib_probe_hw_modes
rt2x00lib_remove_hw
rt2x00lib_probe_hw
rt2x00lib_uninitialize
rt2x00lib_initialize
rt2x00lib_start
rt2x00lib_stop
rt2x00lib_set_if_combinations
rt2x00dev_extra_tx_headroom
rt2x00lib_probe_dev
rt2x00lib_remove_dev
rt2x00lib_suspend
rt2x00lib_resume
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3         Copyright (C) 2010 Willow Garage <http://www.willowgarage.com>
   4         Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
   5         <http://rt2x00.serialmonkey.com>
   6 
   7  */
   8 
   9 /*
  10         Module: rt2x00lib
  11         Abstract: rt2x00 generic device routines.
  12  */
  13 
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/log2.h>
  18 #include <linux/of.h>
  19 #include <linux/of_net.h>
  20 
  21 #include "rt2x00.h"
  22 #include "rt2x00lib.h"
  23 
  24 /*
  25  * Utility functions.
  26  */
  27 u32 rt2x00lib_get_bssidx(struct rt2x00_dev *rt2x00dev,
  28                          struct ieee80211_vif *vif)
  29 {
  30         /*
  31          * When in STA mode, bssidx is always 0 otherwise local_address[5]
  32          * contains the bss number, see BSS_ID_MASK comments for details.
  33          */
  34         if (rt2x00dev->intf_sta_count)
  35                 return 0;
  36         return vif->addr[5] & (rt2x00dev->ops->max_ap_intf - 1);
  37 }
  38 EXPORT_SYMBOL_GPL(rt2x00lib_get_bssidx);
  39 
  40 /*
  41  * Radio control handlers.
  42  */
  43 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  44 {
  45         int status;
  46 
  47         /*
  48          * Don't enable the radio twice.
  49          * And check if the hardware button has been disabled.
  50          */
  51         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  52                 return 0;
  53 
  54         /*
  55          * Initialize all data queues.
  56          */
  57         rt2x00queue_init_queues(rt2x00dev);
  58 
  59         /*
  60          * Enable radio.
  61          */
  62         status =
  63             rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
  64         if (status)
  65                 return status;
  66 
  67         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
  68 
  69         rt2x00leds_led_radio(rt2x00dev, true);
  70         rt2x00led_led_activity(rt2x00dev, true);
  71 
  72         set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
  73 
  74         /*
  75          * Enable queues.
  76          */
  77         rt2x00queue_start_queues(rt2x00dev);
  78         rt2x00link_start_tuner(rt2x00dev);
  79 
  80         /*
  81          * Start watchdog monitoring.
  82          */
  83         rt2x00link_start_watchdog(rt2x00dev);
  84 
  85         return 0;
  86 }
  87 
  88 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
  89 {
  90         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  91                 return;
  92 
  93         /*
  94          * Stop watchdog monitoring.
  95          */
  96         rt2x00link_stop_watchdog(rt2x00dev);
  97 
  98         /*
  99          * Stop all queues
 100          */
 101         rt2x00link_stop_tuner(rt2x00dev);
 102         rt2x00queue_stop_queues(rt2x00dev);
 103         rt2x00queue_flush_queues(rt2x00dev, true);
 104 
 105         /*
 106          * Disable radio.
 107          */
 108         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 109         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 110         rt2x00led_led_activity(rt2x00dev, false);
 111         rt2x00leds_led_radio(rt2x00dev, false);
 112 }
 113 
 114 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 115                                           struct ieee80211_vif *vif)
 116 {
 117         struct rt2x00_dev *rt2x00dev = data;
 118         struct rt2x00_intf *intf = vif_to_intf(vif);
 119 
 120         /*
 121          * It is possible the radio was disabled while the work had been
 122          * scheduled. If that happens we should return here immediately,
 123          * note that in the spinlock protected area above the delayed_flags
 124          * have been cleared correctly.
 125          */
 126         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 127                 return;
 128 
 129         if (test_and_clear_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags)) {
 130                 mutex_lock(&intf->beacon_skb_mutex);
 131                 rt2x00queue_update_beacon(rt2x00dev, vif);
 132                 mutex_unlock(&intf->beacon_skb_mutex);
 133         }
 134 }
 135 
 136 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 137 {
 138         struct rt2x00_dev *rt2x00dev =
 139             container_of(work, struct rt2x00_dev, intf_work);
 140 
 141         /*
 142          * Iterate over each interface and perform the
 143          * requested configurations.
 144          */
 145         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 146                                             IEEE80211_IFACE_ITER_RESUME_ALL,
 147                                             rt2x00lib_intf_scheduled_iter,
 148                                             rt2x00dev);
 149 }
 150 
 151 static void rt2x00lib_autowakeup(struct work_struct *work)
 152 {
 153         struct rt2x00_dev *rt2x00dev =
 154             container_of(work, struct rt2x00_dev, autowakeup_work.work);
 155 
 156         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 157                 return;
 158 
 159         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_AWAKE))
 160                 rt2x00_err(rt2x00dev, "Device failed to wakeup\n");
 161         clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
 162 }
 163 
 164 /*
 165  * Interrupt context handlers.
 166  */
 167 static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac,
 168                                      struct ieee80211_vif *vif)
 169 {
 170         struct ieee80211_tx_control control = {};
 171         struct rt2x00_dev *rt2x00dev = data;
 172         struct sk_buff *skb;
 173 
 174         /*
 175          * Only AP mode interfaces do broad- and multicast buffering
 176          */
 177         if (vif->type != NL80211_IFTYPE_AP)
 178                 return;
 179 
 180         /*
 181          * Send out buffered broad- and multicast frames
 182          */
 183         skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 184         while (skb) {
 185                 rt2x00mac_tx(rt2x00dev->hw, &control, skb);
 186                 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 187         }
 188 }
 189 
 190 static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac,
 191                                         struct ieee80211_vif *vif)
 192 {
 193         struct rt2x00_dev *rt2x00dev = data;
 194 
 195         if (vif->type != NL80211_IFTYPE_AP &&
 196             vif->type != NL80211_IFTYPE_ADHOC &&
 197             vif->type != NL80211_IFTYPE_MESH_POINT &&
 198             vif->type != NL80211_IFTYPE_WDS)
 199                 return;
 200 
 201         /*
 202          * Update the beacon without locking. This is safe on PCI devices
 203          * as they only update the beacon periodically here. This should
 204          * never be called for USB devices.
 205          */
 206         WARN_ON(rt2x00_is_usb(rt2x00dev));
 207         rt2x00queue_update_beacon(rt2x00dev, vif);
 208 }
 209 
 210 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 211 {
 212         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 213                 return;
 214 
 215         /* send buffered bc/mc frames out for every bssid */
 216         ieee80211_iterate_active_interfaces_atomic(
 217                 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 218                 rt2x00lib_bc_buffer_iter, rt2x00dev);
 219         /*
 220          * Devices with pre tbtt interrupt don't need to update the beacon
 221          * here as they will fetch the next beacon directly prior to
 222          * transmission.
 223          */
 224         if (rt2x00_has_cap_pre_tbtt_interrupt(rt2x00dev))
 225                 return;
 226 
 227         /* fetch next beacon */
 228         ieee80211_iterate_active_interfaces_atomic(
 229                 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 230                 rt2x00lib_beaconupdate_iter, rt2x00dev);
 231 }
 232 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 233 
 234 void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev)
 235 {
 236         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 237                 return;
 238 
 239         /* fetch next beacon */
 240         ieee80211_iterate_active_interfaces_atomic(
 241                 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 242                 rt2x00lib_beaconupdate_iter, rt2x00dev);
 243 }
 244 EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
 245 
 246 void rt2x00lib_dmastart(struct queue_entry *entry)
 247 {
 248         set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 249         rt2x00queue_index_inc(entry, Q_INDEX);
 250 }
 251 EXPORT_SYMBOL_GPL(rt2x00lib_dmastart);
 252 
 253 void rt2x00lib_dmadone(struct queue_entry *entry)
 254 {
 255         set_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags);
 256         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 257         rt2x00queue_index_inc(entry, Q_INDEX_DMA_DONE);
 258 }
 259 EXPORT_SYMBOL_GPL(rt2x00lib_dmadone);
 260 
 261 static inline int rt2x00lib_txdone_bar_status(struct queue_entry *entry)
 262 {
 263         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 264         struct ieee80211_bar *bar = (void *) entry->skb->data;
 265         struct rt2x00_bar_list_entry *bar_entry;
 266         int ret;
 267 
 268         if (likely(!ieee80211_is_back_req(bar->frame_control)))
 269                 return 0;
 270 
 271         /*
 272          * Unlike all other frames, the status report for BARs does
 273          * not directly come from the hardware as it is incapable of
 274          * matching a BA to a previously send BAR. The hardware will
 275          * report all BARs as if they weren't acked at all.
 276          *
 277          * Instead the RX-path will scan for incoming BAs and set the
 278          * block_acked flag if it sees one that was likely caused by
 279          * a BAR from us.
 280          *
 281          * Remove remaining BARs here and return their status for
 282          * TX done processing.
 283          */
 284         ret = 0;
 285         rcu_read_lock();
 286         list_for_each_entry_rcu(bar_entry, &rt2x00dev->bar_list, list) {
 287                 if (bar_entry->entry != entry)
 288                         continue;
 289 
 290                 spin_lock_bh(&rt2x00dev->bar_list_lock);
 291                 /* Return whether this BAR was blockacked or not */
 292                 ret = bar_entry->block_acked;
 293                 /* Remove the BAR from our checklist */
 294                 list_del_rcu(&bar_entry->list);
 295                 spin_unlock_bh(&rt2x00dev->bar_list_lock);
 296                 kfree_rcu(bar_entry, head);
 297 
 298                 break;
 299         }
 300         rcu_read_unlock();
 301 
 302         return ret;
 303 }
 304 
 305 static void rt2x00lib_fill_tx_status(struct rt2x00_dev *rt2x00dev,
 306                                      struct ieee80211_tx_info *tx_info,
 307                                      struct skb_frame_desc *skbdesc,
 308                                      struct txdone_entry_desc *txdesc,
 309                                      bool success)
 310 {
 311         u8 rate_idx, rate_flags, retry_rates;
 312         int i;
 313 
 314         rate_idx = skbdesc->tx_rate_idx;
 315         rate_flags = skbdesc->tx_rate_flags;
 316         retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
 317             (txdesc->retry + 1) : 1;
 318 
 319         /*
 320          * Initialize TX status
 321          */
 322         memset(&tx_info->status, 0, sizeof(tx_info->status));
 323         tx_info->status.ack_signal = 0;
 324 
 325         /*
 326          * Frame was send with retries, hardware tried
 327          * different rates to send out the frame, at each
 328          * retry it lowered the rate 1 step except when the
 329          * lowest rate was used.
 330          */
 331         for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
 332                 tx_info->status.rates[i].idx = rate_idx - i;
 333                 tx_info->status.rates[i].flags = rate_flags;
 334 
 335                 if (rate_idx - i == 0) {
 336                         /*
 337                          * The lowest rate (index 0) was used until the
 338                          * number of max retries was reached.
 339                          */
 340                         tx_info->status.rates[i].count = retry_rates - i;
 341                         i++;
 342                         break;
 343                 }
 344                 tx_info->status.rates[i].count = 1;
 345         }
 346         if (i < (IEEE80211_TX_MAX_RATES - 1))
 347                 tx_info->status.rates[i].idx = -1; /* terminate */
 348 
 349         if (test_bit(TXDONE_NO_ACK_REQ, &txdesc->flags))
 350                 tx_info->flags |= IEEE80211_TX_CTL_NO_ACK;
 351 
 352         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 353                 if (success)
 354                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 355                 else
 356                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 357         }
 358 
 359         /*
 360          * Every single frame has it's own tx status, hence report
 361          * every frame as ampdu of size 1.
 362          *
 363          * TODO: if we can find out how many frames were aggregated
 364          * by the hw we could provide the real ampdu_len to mac80211
 365          * which would allow the rc algorithm to better decide on
 366          * which rates are suitable.
 367          */
 368         if (test_bit(TXDONE_AMPDU, &txdesc->flags) ||
 369             tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 370                 tx_info->flags |= IEEE80211_TX_STAT_AMPDU |
 371                                   IEEE80211_TX_CTL_AMPDU;
 372                 tx_info->status.ampdu_len = 1;
 373                 tx_info->status.ampdu_ack_len = success ? 1 : 0;
 374         }
 375 
 376         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 377                 if (success)
 378                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 379                 else
 380                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 381         }
 382 }
 383 
 384 static void rt2x00lib_clear_entry(struct rt2x00_dev *rt2x00dev,
 385                                   struct queue_entry *entry)
 386 {
 387         /*
 388          * Make this entry available for reuse.
 389          */
 390         entry->skb = NULL;
 391         entry->flags = 0;
 392 
 393         rt2x00dev->ops->lib->clear_entry(entry);
 394 
 395         rt2x00queue_index_inc(entry, Q_INDEX_DONE);
 396 
 397         /*
 398          * If the data queue was below the threshold before the txdone
 399          * handler we must make sure the packet queue in the mac80211 stack
 400          * is reenabled when the txdone handler has finished. This has to be
 401          * serialized with rt2x00mac_tx(), otherwise we can wake up queue
 402          * before it was stopped.
 403          */
 404         spin_lock_bh(&entry->queue->tx_lock);
 405         if (!rt2x00queue_threshold(entry->queue))
 406                 rt2x00queue_unpause_queue(entry->queue);
 407         spin_unlock_bh(&entry->queue->tx_lock);
 408 }
 409 
 410 void rt2x00lib_txdone_nomatch(struct queue_entry *entry,
 411                               struct txdone_entry_desc *txdesc)
 412 {
 413         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 414         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 415         struct ieee80211_tx_info txinfo = {};
 416         bool success;
 417 
 418         /*
 419          * Unmap the skb.
 420          */
 421         rt2x00queue_unmap_skb(entry);
 422 
 423         /*
 424          * Signal that the TX descriptor is no longer in the skb.
 425          */
 426         skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
 427 
 428         /*
 429          * Send frame to debugfs immediately, after this call is completed
 430          * we are going to overwrite the skb->cb array.
 431          */
 432         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry);
 433 
 434         /*
 435          * Determine if the frame has been successfully transmitted and
 436          * remove BARs from our check list while checking for their
 437          * TX status.
 438          */
 439         success =
 440             rt2x00lib_txdone_bar_status(entry) ||
 441             test_bit(TXDONE_SUCCESS, &txdesc->flags);
 442 
 443         if (!test_bit(TXDONE_UNKNOWN, &txdesc->flags)) {
 444                 /*
 445                  * Update TX statistics.
 446                  */
 447                 rt2x00dev->link.qual.tx_success += success;
 448                 rt2x00dev->link.qual.tx_failed += !success;
 449 
 450                 rt2x00lib_fill_tx_status(rt2x00dev, &txinfo, skbdesc, txdesc,
 451                                          success);
 452                 ieee80211_tx_status_noskb(rt2x00dev->hw, skbdesc->sta, &txinfo);
 453         }
 454 
 455         dev_kfree_skb_any(entry->skb);
 456         rt2x00lib_clear_entry(rt2x00dev, entry);
 457 }
 458 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_nomatch);
 459 
 460 void rt2x00lib_txdone(struct queue_entry *entry,
 461                       struct txdone_entry_desc *txdesc)
 462 {
 463         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 464         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 465         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 466         u8 skbdesc_flags = skbdesc->flags;
 467         unsigned int header_length;
 468         bool success;
 469 
 470         /*
 471          * Unmap the skb.
 472          */
 473         rt2x00queue_unmap_skb(entry);
 474 
 475         /*
 476          * Remove the extra tx headroom from the skb.
 477          */
 478         skb_pull(entry->skb, rt2x00dev->extra_tx_headroom);
 479 
 480         /*
 481          * Signal that the TX descriptor is no longer in the skb.
 482          */
 483         skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
 484 
 485         /*
 486          * Determine the length of 802.11 header.
 487          */
 488         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 489 
 490         /*
 491          * Remove L2 padding which was added during
 492          */
 493         if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_L2PAD))
 494                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 495 
 496         /*
 497          * If the IV/EIV data was stripped from the frame before it was
 498          * passed to the hardware, we should now reinsert it again because
 499          * mac80211 will expect the same data to be present it the
 500          * frame as it was passed to us.
 501          */
 502         if (rt2x00_has_cap_hw_crypto(rt2x00dev))
 503                 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
 504 
 505         /*
 506          * Send frame to debugfs immediately, after this call is completed
 507          * we are going to overwrite the skb->cb array.
 508          */
 509         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry);
 510 
 511         /*
 512          * Determine if the frame has been successfully transmitted and
 513          * remove BARs from our check list while checking for their
 514          * TX status.
 515          */
 516         success =
 517             rt2x00lib_txdone_bar_status(entry) ||
 518             test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 519             test_bit(TXDONE_UNKNOWN, &txdesc->flags);
 520 
 521         /*
 522          * Update TX statistics.
 523          */
 524         rt2x00dev->link.qual.tx_success += success;
 525         rt2x00dev->link.qual.tx_failed += !success;
 526 
 527         rt2x00lib_fill_tx_status(rt2x00dev, tx_info, skbdesc, txdesc, success);
 528 
 529         /*
 530          * Only send the status report to mac80211 when it's a frame
 531          * that originated in mac80211. If this was a extra frame coming
 532          * through a mac80211 library call (RTS/CTS) then we should not
 533          * send the status report back.
 534          */
 535         if (!(skbdesc_flags & SKBDESC_NOT_MAC80211)) {
 536                 if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TASKLET_CONTEXT))
 537                         ieee80211_tx_status(rt2x00dev->hw, entry->skb);
 538                 else
 539                         ieee80211_tx_status_ni(rt2x00dev->hw, entry->skb);
 540         } else {
 541                 dev_kfree_skb_any(entry->skb);
 542         }
 543 
 544         rt2x00lib_clear_entry(rt2x00dev, entry);
 545 }
 546 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 547 
 548 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
 549 {
 550         struct txdone_entry_desc txdesc;
 551 
 552         txdesc.flags = 0;
 553         __set_bit(status, &txdesc.flags);
 554         txdesc.retry = 0;
 555 
 556         rt2x00lib_txdone(entry, &txdesc);
 557 }
 558 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
 559 
 560 static u8 *rt2x00lib_find_ie(u8 *data, unsigned int len, u8 ie)
 561 {
 562         struct ieee80211_mgmt *mgmt = (void *)data;
 563         u8 *pos, *end;
 564 
 565         pos = (u8 *)mgmt->u.beacon.variable;
 566         end = data + len;
 567         while (pos < end) {
 568                 if (pos + 2 + pos[1] > end)
 569                         return NULL;
 570 
 571                 if (pos[0] == ie)
 572                         return pos;
 573 
 574                 pos += 2 + pos[1];
 575         }
 576 
 577         return NULL;
 578 }
 579 
 580 static void rt2x00lib_sleep(struct work_struct *work)
 581 {
 582         struct rt2x00_dev *rt2x00dev =
 583             container_of(work, struct rt2x00_dev, sleep_work);
 584 
 585         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 586                 return;
 587 
 588         /*
 589          * Check again is powersaving is enabled, to prevent races from delayed
 590          * work execution.
 591          */
 592         if (!test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 593                 rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf,
 594                                  IEEE80211_CONF_CHANGE_PS);
 595 }
 596 
 597 static void rt2x00lib_rxdone_check_ba(struct rt2x00_dev *rt2x00dev,
 598                                       struct sk_buff *skb,
 599                                       struct rxdone_entry_desc *rxdesc)
 600 {
 601         struct rt2x00_bar_list_entry *entry;
 602         struct ieee80211_bar *ba = (void *)skb->data;
 603 
 604         if (likely(!ieee80211_is_back(ba->frame_control)))
 605                 return;
 606 
 607         if (rxdesc->size < sizeof(*ba) + FCS_LEN)
 608                 return;
 609 
 610         rcu_read_lock();
 611         list_for_each_entry_rcu(entry, &rt2x00dev->bar_list, list) {
 612 
 613                 if (ba->start_seq_num != entry->start_seq_num)
 614                         continue;
 615 
 616 #define TID_CHECK(a, b) (                                               \
 617         ((a) & cpu_to_le16(IEEE80211_BAR_CTRL_TID_INFO_MASK)) ==        \
 618         ((b) & cpu_to_le16(IEEE80211_BAR_CTRL_TID_INFO_MASK)))          \
 619 
 620                 if (!TID_CHECK(ba->control, entry->control))
 621                         continue;
 622 
 623 #undef TID_CHECK
 624 
 625                 if (!ether_addr_equal_64bits(ba->ra, entry->ta))
 626                         continue;
 627 
 628                 if (!ether_addr_equal_64bits(ba->ta, entry->ra))
 629                         continue;
 630 
 631                 /* Mark BAR since we received the according BA */
 632                 spin_lock_bh(&rt2x00dev->bar_list_lock);
 633                 entry->block_acked = 1;
 634                 spin_unlock_bh(&rt2x00dev->bar_list_lock);
 635                 break;
 636         }
 637         rcu_read_unlock();
 638 
 639 }
 640 
 641 static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev,
 642                                       struct sk_buff *skb,
 643                                       struct rxdone_entry_desc *rxdesc)
 644 {
 645         struct ieee80211_hdr *hdr = (void *) skb->data;
 646         struct ieee80211_tim_ie *tim_ie;
 647         u8 *tim;
 648         u8 tim_len;
 649         bool cam;
 650 
 651         /* If this is not a beacon, or if mac80211 has no powersaving
 652          * configured, or if the device is already in powersaving mode
 653          * we can exit now. */
 654         if (likely(!ieee80211_is_beacon(hdr->frame_control) ||
 655                    !(rt2x00dev->hw->conf.flags & IEEE80211_CONF_PS)))
 656                 return;
 657 
 658         /* min. beacon length + FCS_LEN */
 659         if (skb->len <= 40 + FCS_LEN)
 660                 return;
 661 
 662         /* and only beacons from the associated BSSID, please */
 663         if (!(rxdesc->dev_flags & RXDONE_MY_BSS) ||
 664             !rt2x00dev->aid)
 665                 return;
 666 
 667         rt2x00dev->last_beacon = jiffies;
 668 
 669         tim = rt2x00lib_find_ie(skb->data, skb->len - FCS_LEN, WLAN_EID_TIM);
 670         if (!tim)
 671                 return;
 672 
 673         if (tim[1] < sizeof(*tim_ie))
 674                 return;
 675 
 676         tim_len = tim[1];
 677         tim_ie = (struct ieee80211_tim_ie *) &tim[2];
 678 
 679         /* Check whenever the PHY can be turned off again. */
 680 
 681         /* 1. What about buffered unicast traffic for our AID? */
 682         cam = ieee80211_check_tim(tim_ie, tim_len, rt2x00dev->aid);
 683 
 684         /* 2. Maybe the AP wants to send multicast/broadcast data? */
 685         cam |= (tim_ie->bitmap_ctrl & 0x01);
 686 
 687         if (!cam && !test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
 688                 queue_work(rt2x00dev->workqueue, &rt2x00dev->sleep_work);
 689 }
 690 
 691 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 692                                         struct rxdone_entry_desc *rxdesc)
 693 {
 694         struct ieee80211_supported_band *sband;
 695         const struct rt2x00_rate *rate;
 696         unsigned int i;
 697         int signal = rxdesc->signal;
 698         int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 699 
 700         switch (rxdesc->rate_mode) {
 701         case RATE_MODE_CCK:
 702         case RATE_MODE_OFDM:
 703                 /*
 704                  * For non-HT rates the MCS value needs to contain the
 705                  * actually used rate modulation (CCK or OFDM).
 706                  */
 707                 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 708                         signal = RATE_MCS(rxdesc->rate_mode, signal);
 709 
 710                 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 711                 for (i = 0; i < sband->n_bitrates; i++) {
 712                         rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 713                         if (((type == RXDONE_SIGNAL_PLCP) &&
 714                              (rate->plcp == signal)) ||
 715                             ((type == RXDONE_SIGNAL_BITRATE) &&
 716                               (rate->bitrate == signal)) ||
 717                             ((type == RXDONE_SIGNAL_MCS) &&
 718                               (rate->mcs == signal))) {
 719                                 return i;
 720                         }
 721                 }
 722                 break;
 723         case RATE_MODE_HT_MIX:
 724         case RATE_MODE_HT_GREENFIELD:
 725                 if (signal >= 0 && signal <= 76)
 726                         return signal;
 727                 break;
 728         default:
 729                 break;
 730         }
 731 
 732         rt2x00_warn(rt2x00dev, "Frame received with unrecognized signal, mode=0x%.4x, signal=0x%.4x, type=%d\n",
 733                     rxdesc->rate_mode, signal, type);
 734         return 0;
 735 }
 736 
 737 void rt2x00lib_rxdone(struct queue_entry *entry, gfp_t gfp)
 738 {
 739         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 740         struct rxdone_entry_desc rxdesc;
 741         struct sk_buff *skb;
 742         struct ieee80211_rx_status *rx_status;
 743         unsigned int header_length;
 744         int rate_idx;
 745 
 746         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 747             !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 748                 goto submit_entry;
 749 
 750         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 751                 goto submit_entry;
 752 
 753         /*
 754          * Allocate a new sk_buffer. If no new buffer available, drop the
 755          * received frame and reuse the existing buffer.
 756          */
 757         skb = rt2x00queue_alloc_rxskb(entry, gfp);
 758         if (!skb)
 759                 goto submit_entry;
 760 
 761         /*
 762          * Unmap the skb.
 763          */
 764         rt2x00queue_unmap_skb(entry);
 765 
 766         /*
 767          * Extract the RXD details.
 768          */
 769         memset(&rxdesc, 0, sizeof(rxdesc));
 770         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 771 
 772         /*
 773          * Check for valid size in case we get corrupted descriptor from
 774          * hardware.
 775          */
 776         if (unlikely(rxdesc.size == 0 ||
 777                      rxdesc.size > entry->queue->data_size)) {
 778                 rt2x00_err(rt2x00dev, "Wrong frame size %d max %d\n",
 779                            rxdesc.size, entry->queue->data_size);
 780                 dev_kfree_skb(entry->skb);
 781                 goto renew_skb;
 782         }
 783 
 784         /*
 785          * The data behind the ieee80211 header must be
 786          * aligned on a 4 byte boundary.
 787          */
 788         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 789 
 790         /*
 791          * Hardware might have stripped the IV/EIV/ICV data,
 792          * in that case it is possible that the data was
 793          * provided separately (through hardware descriptor)
 794          * in which case we should reinsert the data into the frame.
 795          */
 796         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 797             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 798                 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
 799                                           &rxdesc);
 800         else if (header_length &&
 801                  (rxdesc.size > header_length) &&
 802                  (rxdesc.dev_flags & RXDONE_L2PAD))
 803                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 804 
 805         /* Trim buffer to correct size */
 806         skb_trim(entry->skb, rxdesc.size);
 807 
 808         /*
 809          * Translate the signal to the correct bitrate index.
 810          */
 811         rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 812         if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
 813             rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
 814                 rxdesc.encoding = RX_ENC_HT;
 815 
 816         /*
 817          * Check if this is a beacon, and more frames have been
 818          * buffered while we were in powersaving mode.
 819          */
 820         rt2x00lib_rxdone_check_ps(rt2x00dev, entry->skb, &rxdesc);
 821 
 822         /*
 823          * Check for incoming BlockAcks to match to the BlockAckReqs
 824          * we've send out.
 825          */
 826         rt2x00lib_rxdone_check_ba(rt2x00dev, entry->skb, &rxdesc);
 827 
 828         /*
 829          * Update extra components
 830          */
 831         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 832         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 833         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry);
 834 
 835         /*
 836          * Initialize RX status information, and send frame
 837          * to mac80211.
 838          */
 839         rx_status = IEEE80211_SKB_RXCB(entry->skb);
 840 
 841         /* Ensure that all fields of rx_status are initialized
 842          * properly. The skb->cb array was used for driver
 843          * specific informations, so rx_status might contain
 844          * garbage.
 845          */
 846         memset(rx_status, 0, sizeof(*rx_status));
 847 
 848         rx_status->mactime = rxdesc.timestamp;
 849         rx_status->band = rt2x00dev->curr_band;
 850         rx_status->freq = rt2x00dev->curr_freq;
 851         rx_status->rate_idx = rate_idx;
 852         rx_status->signal = rxdesc.rssi;
 853         rx_status->flag = rxdesc.flags;
 854         rx_status->enc_flags = rxdesc.enc_flags;
 855         rx_status->encoding = rxdesc.encoding;
 856         rx_status->bw = rxdesc.bw;
 857         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 858 
 859         ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
 860 
 861 renew_skb:
 862         /*
 863          * Replace the skb with the freshly allocated one.
 864          */
 865         entry->skb = skb;
 866 
 867 submit_entry:
 868         entry->flags = 0;
 869         rt2x00queue_index_inc(entry, Q_INDEX_DONE);
 870         if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
 871             test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 872                 rt2x00dev->ops->lib->clear_entry(entry);
 873 }
 874 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 875 
 876 /*
 877  * Driver initialization handlers.
 878  */
 879 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 880         {
 881                 .flags = DEV_RATE_CCK,
 882                 .bitrate = 10,
 883                 .ratemask = BIT(0),
 884                 .plcp = 0x00,
 885                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 886         },
 887         {
 888                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 889                 .bitrate = 20,
 890                 .ratemask = BIT(1),
 891                 .plcp = 0x01,
 892                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 893         },
 894         {
 895                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 896                 .bitrate = 55,
 897                 .ratemask = BIT(2),
 898                 .plcp = 0x02,
 899                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 900         },
 901         {
 902                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 903                 .bitrate = 110,
 904                 .ratemask = BIT(3),
 905                 .plcp = 0x03,
 906                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 907         },
 908         {
 909                 .flags = DEV_RATE_OFDM,
 910                 .bitrate = 60,
 911                 .ratemask = BIT(4),
 912                 .plcp = 0x0b,
 913                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 914         },
 915         {
 916                 .flags = DEV_RATE_OFDM,
 917                 .bitrate = 90,
 918                 .ratemask = BIT(5),
 919                 .plcp = 0x0f,
 920                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 921         },
 922         {
 923                 .flags = DEV_RATE_OFDM,
 924                 .bitrate = 120,
 925                 .ratemask = BIT(6),
 926                 .plcp = 0x0a,
 927                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 928         },
 929         {
 930                 .flags = DEV_RATE_OFDM,
 931                 .bitrate = 180,
 932                 .ratemask = BIT(7),
 933                 .plcp = 0x0e,
 934                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 935         },
 936         {
 937                 .flags = DEV_RATE_OFDM,
 938                 .bitrate = 240,
 939                 .ratemask = BIT(8),
 940                 .plcp = 0x09,
 941                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 942         },
 943         {
 944                 .flags = DEV_RATE_OFDM,
 945                 .bitrate = 360,
 946                 .ratemask = BIT(9),
 947                 .plcp = 0x0d,
 948                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 949         },
 950         {
 951                 .flags = DEV_RATE_OFDM,
 952                 .bitrate = 480,
 953                 .ratemask = BIT(10),
 954                 .plcp = 0x08,
 955                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 956         },
 957         {
 958                 .flags = DEV_RATE_OFDM,
 959                 .bitrate = 540,
 960                 .ratemask = BIT(11),
 961                 .plcp = 0x0c,
 962                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 963         },
 964 };
 965 
 966 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 967                               const int channel, const int tx_power,
 968                               const int value)
 969 {
 970         /* XXX: this assumption about the band is wrong for 802.11j */
 971         entry->band = channel <= 14 ? NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
 972         entry->center_freq = ieee80211_channel_to_frequency(channel,
 973                                                             entry->band);
 974         entry->hw_value = value;
 975         entry->max_power = tx_power;
 976         entry->max_antenna_gain = 0xff;
 977 }
 978 
 979 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 980                            const u16 index, const struct rt2x00_rate *rate)
 981 {
 982         entry->flags = 0;
 983         entry->bitrate = rate->bitrate;
 984         entry->hw_value = index;
 985         entry->hw_value_short = index;
 986 
 987         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 988                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 989 }
 990 
 991 void rt2x00lib_set_mac_address(struct rt2x00_dev *rt2x00dev, u8 *eeprom_mac_addr)
 992 {
 993         const char *mac_addr;
 994 
 995         mac_addr = of_get_mac_address(rt2x00dev->dev->of_node);
 996         if (!IS_ERR(mac_addr))
 997                 ether_addr_copy(eeprom_mac_addr, mac_addr);
 998 
 999         if (!is_valid_ether_addr(eeprom_mac_addr)) {
1000                 eth_random_addr(eeprom_mac_addr);
1001                 rt2x00_eeprom_dbg(rt2x00dev, "MAC: %pM\n", eeprom_mac_addr);
1002         }
1003 }
1004 EXPORT_SYMBOL_GPL(rt2x00lib_set_mac_address);
1005 
1006 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
1007                                     struct hw_mode_spec *spec)
1008 {
1009         struct ieee80211_hw *hw = rt2x00dev->hw;
1010         struct ieee80211_channel *channels;
1011         struct ieee80211_rate *rates;
1012         unsigned int num_rates;
1013         unsigned int i;
1014 
1015         num_rates = 0;
1016         if (spec->supported_rates & SUPPORT_RATE_CCK)
1017                 num_rates += 4;
1018         if (spec->supported_rates & SUPPORT_RATE_OFDM)
1019                 num_rates += 8;
1020 
1021         channels = kcalloc(spec->num_channels, sizeof(*channels), GFP_KERNEL);
1022         if (!channels)
1023                 return -ENOMEM;
1024 
1025         rates = kcalloc(num_rates, sizeof(*rates), GFP_KERNEL);
1026         if (!rates)
1027                 goto exit_free_channels;
1028 
1029         /*
1030          * Initialize Rate list.
1031          */
1032         for (i = 0; i < num_rates; i++)
1033                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
1034 
1035         /*
1036          * Initialize Channel list.
1037          */
1038         for (i = 0; i < spec->num_channels; i++) {
1039                 rt2x00lib_channel(&channels[i],
1040                                   spec->channels[i].channel,
1041                                   spec->channels_info[i].max_power, i);
1042         }
1043 
1044         /*
1045          * Intitialize 802.11b, 802.11g
1046          * Rates: CCK, OFDM.
1047          * Channels: 2.4 GHz
1048          */
1049         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
1050                 rt2x00dev->bands[NL80211_BAND_2GHZ].n_channels = 14;
1051                 rt2x00dev->bands[NL80211_BAND_2GHZ].n_bitrates = num_rates;
1052                 rt2x00dev->bands[NL80211_BAND_2GHZ].channels = channels;
1053                 rt2x00dev->bands[NL80211_BAND_2GHZ].bitrates = rates;
1054                 hw->wiphy->bands[NL80211_BAND_2GHZ] =
1055                     &rt2x00dev->bands[NL80211_BAND_2GHZ];
1056                 memcpy(&rt2x00dev->bands[NL80211_BAND_2GHZ].ht_cap,
1057                        &spec->ht, sizeof(spec->ht));
1058         }
1059 
1060         /*
1061          * Intitialize 802.11a
1062          * Rates: OFDM.
1063          * Channels: OFDM, UNII, HiperLAN2.
1064          */
1065         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
1066                 rt2x00dev->bands[NL80211_BAND_5GHZ].n_channels =
1067                     spec->num_channels - 14;
1068                 rt2x00dev->bands[NL80211_BAND_5GHZ].n_bitrates =
1069                     num_rates - 4;
1070                 rt2x00dev->bands[NL80211_BAND_5GHZ].channels = &channels[14];
1071                 rt2x00dev->bands[NL80211_BAND_5GHZ].bitrates = &rates[4];
1072                 hw->wiphy->bands[NL80211_BAND_5GHZ] =
1073                     &rt2x00dev->bands[NL80211_BAND_5GHZ];
1074                 memcpy(&rt2x00dev->bands[NL80211_BAND_5GHZ].ht_cap,
1075                        &spec->ht, sizeof(spec->ht));
1076         }
1077 
1078         return 0;
1079 
1080  exit_free_channels:
1081         kfree(channels);
1082         rt2x00_err(rt2x00dev, "Allocation ieee80211 modes failed\n");
1083         return -ENOMEM;
1084 }
1085 
1086 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
1087 {
1088         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
1089                 ieee80211_unregister_hw(rt2x00dev->hw);
1090 
1091         if (likely(rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ])) {
1092                 kfree(rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ]->channels);
1093                 kfree(rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ]->bitrates);
1094                 rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ] = NULL;
1095                 rt2x00dev->hw->wiphy->bands[NL80211_BAND_5GHZ] = NULL;
1096         }
1097 
1098         kfree(rt2x00dev->spec.channels_info);
1099 }
1100 
1101 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
1102 {
1103         struct hw_mode_spec *spec = &rt2x00dev->spec;
1104         int status;
1105 
1106         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
1107                 return 0;
1108 
1109         /*
1110          * Initialize HW modes.
1111          */
1112         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
1113         if (status)
1114                 return status;
1115 
1116         /*
1117          * Initialize HW fields.
1118          */
1119         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
1120 
1121         /*
1122          * Initialize extra TX headroom required.
1123          */
1124         rt2x00dev->hw->extra_tx_headroom =
1125                 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
1126                       rt2x00dev->extra_tx_headroom);
1127 
1128         /*
1129          * Take TX headroom required for alignment into account.
1130          */
1131         if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_L2PAD))
1132                 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
1133         else if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DMA))
1134                 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
1135 
1136         /*
1137          * Tell mac80211 about the size of our private STA structure.
1138          */
1139         rt2x00dev->hw->sta_data_size = sizeof(struct rt2x00_sta);
1140 
1141         /*
1142          * Allocate tx status FIFO for driver use.
1143          */
1144         if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TXSTATUS_FIFO)) {
1145                 /*
1146                  * Allocate the txstatus fifo. In the worst case the tx
1147                  * status fifo has to hold the tx status of all entries
1148                  * in all tx queues. Hence, calculate the kfifo size as
1149                  * tx_queues * entry_num and round up to the nearest
1150                  * power of 2.
1151                  */
1152                 int kfifo_size =
1153                         roundup_pow_of_two(rt2x00dev->ops->tx_queues *
1154                                            rt2x00dev->tx->limit *
1155                                            sizeof(u32));
1156 
1157                 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, kfifo_size,
1158                                      GFP_KERNEL);
1159                 if (status)
1160                         return status;
1161         }
1162 
1163         /*
1164          * Initialize tasklets if used by the driver. Tasklets are
1165          * disabled until the interrupts are turned on. The driver
1166          * has to handle that.
1167          */
1168 #define RT2X00_TASKLET_INIT(taskletname) \
1169         if (rt2x00dev->ops->lib->taskletname) { \
1170                 tasklet_init(&rt2x00dev->taskletname, \
1171                              rt2x00dev->ops->lib->taskletname, \
1172                              (unsigned long)rt2x00dev); \
1173         }
1174 
1175         RT2X00_TASKLET_INIT(txstatus_tasklet);
1176         RT2X00_TASKLET_INIT(pretbtt_tasklet);
1177         RT2X00_TASKLET_INIT(tbtt_tasklet);
1178         RT2X00_TASKLET_INIT(rxdone_tasklet);
1179         RT2X00_TASKLET_INIT(autowake_tasklet);
1180 
1181 #undef RT2X00_TASKLET_INIT
1182 
1183         /*
1184          * Register HW.
1185          */
1186         status = ieee80211_register_hw(rt2x00dev->hw);
1187         if (status)
1188                 return status;
1189 
1190         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
1191 
1192         return 0;
1193 }
1194 
1195 /*
1196  * Initialization/uninitialization handlers.
1197  */
1198 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
1199 {
1200         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1201                 return;
1202 
1203         /*
1204          * Stop rfkill polling.
1205          */
1206         if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
1207                 rt2x00rfkill_unregister(rt2x00dev);
1208 
1209         /*
1210          * Allow the HW to uninitialize.
1211          */
1212         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1213 
1214         /*
1215          * Free allocated queue entries.
1216          */
1217         rt2x00queue_uninitialize(rt2x00dev);
1218 }
1219 
1220 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1221 {
1222         int status;
1223 
1224         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1225                 return 0;
1226 
1227         /*
1228          * Allocate all queue entries.
1229          */
1230         status = rt2x00queue_initialize(rt2x00dev);
1231         if (status)
1232                 return status;
1233 
1234         /*
1235          * Initialize the device.
1236          */
1237         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1238         if (status) {
1239                 rt2x00queue_uninitialize(rt2x00dev);
1240                 return status;
1241         }
1242 
1243         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
1244 
1245         /*
1246          * Start rfkill polling.
1247          */
1248         if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
1249                 rt2x00rfkill_register(rt2x00dev);
1250 
1251         return 0;
1252 }
1253 
1254 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1255 {
1256         int retval = 0;
1257 
1258         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags)) {
1259                 /*
1260                  * This is special case for ieee80211_restart_hw(), otherwise
1261                  * mac80211 never call start() two times in row without stop();
1262                  */
1263                 set_bit(DEVICE_STATE_RESET, &rt2x00dev->flags);
1264                 rt2x00dev->ops->lib->pre_reset_hw(rt2x00dev);
1265                 rt2x00lib_stop(rt2x00dev);
1266         }
1267 
1268         /*
1269          * If this is the first interface which is added,
1270          * we should load the firmware now.
1271          */
1272         retval = rt2x00lib_load_firmware(rt2x00dev);
1273         if (retval)
1274                 goto out;
1275 
1276         /*
1277          * Initialize the device.
1278          */
1279         retval = rt2x00lib_initialize(rt2x00dev);
1280         if (retval)
1281                 goto out;
1282 
1283         rt2x00dev->intf_ap_count = 0;
1284         rt2x00dev->intf_sta_count = 0;
1285         rt2x00dev->intf_associated = 0;
1286 
1287         /* Enable the radio */
1288         retval = rt2x00lib_enable_radio(rt2x00dev);
1289         if (retval)
1290                 goto out;
1291 
1292         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
1293 
1294 out:
1295         clear_bit(DEVICE_STATE_RESET, &rt2x00dev->flags);
1296         return retval;
1297 }
1298 
1299 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1300 {
1301         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1302                 return;
1303 
1304         /*
1305          * Perhaps we can add something smarter here,
1306          * but for now just disabling the radio should do.
1307          */
1308         rt2x00lib_disable_radio(rt2x00dev);
1309 
1310         rt2x00dev->intf_ap_count = 0;
1311         rt2x00dev->intf_sta_count = 0;
1312         rt2x00dev->intf_associated = 0;
1313 }
1314 
1315 static inline void rt2x00lib_set_if_combinations(struct rt2x00_dev *rt2x00dev)
1316 {
1317         struct ieee80211_iface_limit *if_limit;
1318         struct ieee80211_iface_combination *if_combination;
1319 
1320         if (rt2x00dev->ops->max_ap_intf < 2)
1321                 return;
1322 
1323         /*
1324          * Build up AP interface limits structure.
1325          */
1326         if_limit = &rt2x00dev->if_limits_ap;
1327         if_limit->max = rt2x00dev->ops->max_ap_intf;
1328         if_limit->types = BIT(NL80211_IFTYPE_AP);
1329 #ifdef CONFIG_MAC80211_MESH
1330         if_limit->types |= BIT(NL80211_IFTYPE_MESH_POINT);
1331 #endif
1332 
1333         /*
1334          * Build up AP interface combinations structure.
1335          */
1336         if_combination = &rt2x00dev->if_combinations[IF_COMB_AP];
1337         if_combination->limits = if_limit;
1338         if_combination->n_limits = 1;
1339         if_combination->max_interfaces = if_limit->max;
1340         if_combination->num_different_channels = 1;
1341 
1342         /*
1343          * Finally, specify the possible combinations to mac80211.
1344          */
1345         rt2x00dev->hw->wiphy->iface_combinations = rt2x00dev->if_combinations;
1346         rt2x00dev->hw->wiphy->n_iface_combinations = 1;
1347 }
1348 
1349 static unsigned int rt2x00dev_extra_tx_headroom(struct rt2x00_dev *rt2x00dev)
1350 {
1351         if (WARN_ON(!rt2x00dev->tx))
1352                 return 0;
1353 
1354         if (rt2x00_is_usb(rt2x00dev))
1355                 return rt2x00dev->tx[0].winfo_size + rt2x00dev->tx[0].desc_size;
1356 
1357         return rt2x00dev->tx[0].winfo_size;
1358 }
1359 
1360 /*
1361  * driver allocation handlers.
1362  */
1363 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1364 {
1365         int retval = -ENOMEM;
1366 
1367         /*
1368          * Set possible interface combinations.
1369          */
1370         rt2x00lib_set_if_combinations(rt2x00dev);
1371 
1372         /*
1373          * Allocate the driver data memory, if necessary.
1374          */
1375         if (rt2x00dev->ops->drv_data_size > 0) {
1376                 rt2x00dev->drv_data = kzalloc(rt2x00dev->ops->drv_data_size,
1377                                               GFP_KERNEL);
1378                 if (!rt2x00dev->drv_data) {
1379                         retval = -ENOMEM;
1380                         goto exit;
1381                 }
1382         }
1383 
1384         spin_lock_init(&rt2x00dev->irqmask_lock);
1385         mutex_init(&rt2x00dev->csr_mutex);
1386         mutex_init(&rt2x00dev->conf_mutex);
1387         INIT_LIST_HEAD(&rt2x00dev->bar_list);
1388         spin_lock_init(&rt2x00dev->bar_list_lock);
1389         hrtimer_init(&rt2x00dev->txstatus_timer, CLOCK_MONOTONIC,
1390                      HRTIMER_MODE_REL);
1391 
1392         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1393 
1394         /*
1395          * Make room for rt2x00_intf inside the per-interface
1396          * structure ieee80211_vif.
1397          */
1398         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1399 
1400         /*
1401          * rt2x00 devices can only use the last n bits of the MAC address
1402          * for virtual interfaces.
1403          */
1404         rt2x00dev->hw->wiphy->addr_mask[ETH_ALEN - 1] =
1405                 (rt2x00dev->ops->max_ap_intf - 1);
1406 
1407         /*
1408          * Initialize work.
1409          */
1410         rt2x00dev->workqueue =
1411             alloc_ordered_workqueue("%s", 0, wiphy_name(rt2x00dev->hw->wiphy));
1412         if (!rt2x00dev->workqueue) {
1413                 retval = -ENOMEM;
1414                 goto exit;
1415         }
1416 
1417         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1418         INIT_DELAYED_WORK(&rt2x00dev->autowakeup_work, rt2x00lib_autowakeup);
1419         INIT_WORK(&rt2x00dev->sleep_work, rt2x00lib_sleep);
1420 
1421         /*
1422          * Let the driver probe the device to detect the capabilities.
1423          */
1424         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1425         if (retval) {
1426                 rt2x00_err(rt2x00dev, "Failed to allocate device\n");
1427                 goto exit;
1428         }
1429 
1430         /*
1431          * Allocate queue array.
1432          */
1433         retval = rt2x00queue_allocate(rt2x00dev);
1434         if (retval)
1435                 goto exit;
1436 
1437         /* Cache TX headroom value */
1438         rt2x00dev->extra_tx_headroom = rt2x00dev_extra_tx_headroom(rt2x00dev);
1439 
1440         /*
1441          * Determine which operating modes are supported, all modes
1442          * which require beaconing, depend on the availability of
1443          * beacon entries.
1444          */
1445         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
1446         if (rt2x00dev->bcn->limit > 0)
1447                 rt2x00dev->hw->wiphy->interface_modes |=
1448                     BIT(NL80211_IFTYPE_ADHOC) |
1449 #ifdef CONFIG_MAC80211_MESH
1450                     BIT(NL80211_IFTYPE_MESH_POINT) |
1451 #endif
1452 #ifdef CONFIG_WIRELESS_WDS
1453                     BIT(NL80211_IFTYPE_WDS) |
1454 #endif
1455                     BIT(NL80211_IFTYPE_AP);
1456 
1457         rt2x00dev->hw->wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
1458 
1459         wiphy_ext_feature_set(rt2x00dev->hw->wiphy,
1460                               NL80211_EXT_FEATURE_CQM_RSSI_LIST);
1461 
1462         /*
1463          * Initialize ieee80211 structure.
1464          */
1465         retval = rt2x00lib_probe_hw(rt2x00dev);
1466         if (retval) {
1467                 rt2x00_err(rt2x00dev, "Failed to initialize hw\n");
1468                 goto exit;
1469         }
1470 
1471         /*
1472          * Register extra components.
1473          */
1474         rt2x00link_register(rt2x00dev);
1475         rt2x00leds_register(rt2x00dev);
1476         rt2x00debug_register(rt2x00dev);
1477 
1478         /*
1479          * Start rfkill polling.
1480          */
1481         if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
1482                 rt2x00rfkill_register(rt2x00dev);
1483 
1484         return 0;
1485 
1486 exit:
1487         rt2x00lib_remove_dev(rt2x00dev);
1488 
1489         return retval;
1490 }
1491 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1492 
1493 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1494 {
1495         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1496 
1497         /*
1498          * Stop rfkill polling.
1499          */
1500         if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
1501                 rt2x00rfkill_unregister(rt2x00dev);
1502 
1503         /*
1504          * Disable radio.
1505          */
1506         rt2x00lib_disable_radio(rt2x00dev);
1507 
1508         /*
1509          * Stop all work.
1510          */
1511         cancel_work_sync(&rt2x00dev->intf_work);
1512         cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
1513         cancel_work_sync(&rt2x00dev->sleep_work);
1514 
1515         hrtimer_cancel(&rt2x00dev->txstatus_timer);
1516 
1517         /*
1518          * Kill the tx status tasklet.
1519          */
1520         tasklet_kill(&rt2x00dev->txstatus_tasklet);
1521         tasklet_kill(&rt2x00dev->pretbtt_tasklet);
1522         tasklet_kill(&rt2x00dev->tbtt_tasklet);
1523         tasklet_kill(&rt2x00dev->rxdone_tasklet);
1524         tasklet_kill(&rt2x00dev->autowake_tasklet);
1525 
1526         /*
1527          * Uninitialize device.
1528          */
1529         rt2x00lib_uninitialize(rt2x00dev);
1530 
1531         if (rt2x00dev->workqueue)
1532                 destroy_workqueue(rt2x00dev->workqueue);
1533 
1534         /*
1535          * Free the tx status fifo.
1536          */
1537         kfifo_free(&rt2x00dev->txstatus_fifo);
1538 
1539         /*
1540          * Free extra components
1541          */
1542         rt2x00debug_deregister(rt2x00dev);
1543         rt2x00leds_unregister(rt2x00dev);
1544 
1545         /*
1546          * Free ieee80211_hw memory.
1547          */
1548         rt2x00lib_remove_hw(rt2x00dev);
1549 
1550         /*
1551          * Free firmware image.
1552          */
1553         rt2x00lib_free_firmware(rt2x00dev);
1554 
1555         /*
1556          * Free queue structures.
1557          */
1558         rt2x00queue_free(rt2x00dev);
1559 
1560         /*
1561          * Free the driver data.
1562          */
1563         kfree(rt2x00dev->drv_data);
1564 }
1565 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1566 
1567 /*
1568  * Device state handlers
1569  */
1570 #ifdef CONFIG_PM
1571 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1572 {
1573         rt2x00_dbg(rt2x00dev, "Going to sleep\n");
1574 
1575         /*
1576          * Prevent mac80211 from accessing driver while suspended.
1577          */
1578         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1579                 return 0;
1580 
1581         /*
1582          * Cleanup as much as possible.
1583          */
1584         rt2x00lib_uninitialize(rt2x00dev);
1585 
1586         /*
1587          * Suspend/disable extra components.
1588          */
1589         rt2x00leds_suspend(rt2x00dev);
1590         rt2x00debug_deregister(rt2x00dev);
1591 
1592         /*
1593          * Set device mode to sleep for power management,
1594          * on some hardware this call seems to consistently fail.
1595          * From the specifications it is hard to tell why it fails,
1596          * and if this is a "bad thing".
1597          * Overall it is safe to just ignore the failure and
1598          * continue suspending. The only downside is that the
1599          * device will not be in optimal power save mode, but with
1600          * the radio and the other components already disabled the
1601          * device is as good as disabled.
1602          */
1603         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1604                 rt2x00_warn(rt2x00dev, "Device failed to enter sleep state, continue suspending\n");
1605 
1606         return 0;
1607 }
1608 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1609 
1610 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1611 {
1612         rt2x00_dbg(rt2x00dev, "Waking up\n");
1613 
1614         /*
1615          * Restore/enable extra components.
1616          */
1617         rt2x00debug_register(rt2x00dev);
1618         rt2x00leds_resume(rt2x00dev);
1619 
1620         /*
1621          * We are ready again to receive requests from mac80211.
1622          */
1623         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1624 
1625         return 0;
1626 }
1627 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1628 #endif /* CONFIG_PM */
1629 
1630 /*
1631  * rt2x00lib module information.
1632  */
1633 MODULE_AUTHOR(DRV_PROJECT);
1634 MODULE_VERSION(DRV_VERSION);
1635 MODULE_DESCRIPTION("rt2x00 library");
1636 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c

DEFINITIONS
