drivers/net/wireless/rt2x00/rt2x00dev.c

   1 /*
   2         Copyright (C) 2010 Willow Garage <http://www.willowgarage.com>
   3         Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
   4         <http://rt2x00.serialmonkey.com>
   5
   6         This program is free software; you can redistribute it and/or modify
   7         it under the terms of the GNU General Public License as published by
   8         the Free Software Foundation; either version 2 of the License, or
   9         (at your option) any later version.
  10
  11         This program is distributed in the hope that it will be useful,
  12         but WITHOUT ANY WARRANTY; without even the implied warranty of
  13         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14         GNU General Public License for more details.
  15
  16         You should have received a copy of the GNU General Public License
  17         along with this program; if not, write to the
  18         Free Software Foundation, Inc.,
  19         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  */
  21
  22 /*
  23         Module: rt2x00lib
  24         Abstract: rt2x00 generic device routines.
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/slab.h>
  30
  31 #include "rt2x00.h"
  32 #include "rt2x00lib.h"
  33
  34 /*
  35  * Radio control handlers.
  36  */
  37 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  38 {
  39         int status;
  40
  41         /*
  42          * Don't enable the radio twice.
  43          * And check if the hardware button has been disabled.
  44          */
  45         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  46                 return 0;
  47
  48         /*
  49          * Initialize all data queues.
  50          */
  51         rt2x00queue_init_queues(rt2x00dev);
  52
  53         /*
  54          * Enable radio.
  55          */
  56         status =
  57             rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
  58         if (status)
  59                 return status;
  60
  61         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
  62
  63         rt2x00leds_led_radio(rt2x00dev, true);
  64         rt2x00led_led_activity(rt2x00dev, true);
  65
  66         set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
  67
  68         /*
  69          * Enable queues.
  70          */
  71         rt2x00queue_start_queues(rt2x00dev);
  72         rt2x00link_start_tuner(rt2x00dev);
  73
  74         /*
  75          * Start watchdog monitoring.
  76          */
  77         rt2x00link_start_watchdog(rt2x00dev);
  78
  79         return 0;
  80 }
  81
  82 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
  83 {
  84         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  85                 return;
  86
  87         /*
  88          * Stop watchdog monitoring.
  89          */
  90         rt2x00link_stop_watchdog(rt2x00dev);
  91
  92         /*
  93          * Stop all queues
  94          */
  95         rt2x00link_stop_tuner(rt2x00dev);
  96         rt2x00queue_stop_queues(rt2x00dev);
  97         rt2x00queue_flush_queues(rt2x00dev, true);
  98
  99         /*
 100          * Disable radio.
 101          */
 102         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 103         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 104         rt2x00led_led_activity(rt2x00dev, false);
 105         rt2x00leds_led_radio(rt2x00dev, false);
 106 }
 107
 108 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 109                                           struct ieee80211_vif *vif)
 110 {
 111         struct rt2x00_dev *rt2x00dev = data;
 112         struct rt2x00_intf *intf = vif_to_intf(vif);
 113
 114         /*
 115          * It is possible the radio was disabled while the work had been
 116          * scheduled. If that happens we should return here immediately,
 117          * note that in the spinlock protected area above the delayed_flags
 118          * have been cleared correctly.
 119          */
 120         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 121                 return;
 122
 123         if (test_and_clear_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags))
 124                 rt2x00queue_update_beacon(rt2x00dev, vif);
 125 }
 126
 127 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 128 {
 129         struct rt2x00_dev *rt2x00dev =
 130             container_of(work, struct rt2x00_dev, intf_work);
 131
 132         /*
 133          * Iterate over each interface and perform the
 134          * requested configurations.
 135          */
 136         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 137                                             rt2x00lib_intf_scheduled_iter,
 138                                             rt2x00dev);
 139 }
 140
 141 /*
 142  * Interrupt context handlers.
 143  */
 144 static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac,
 145                                      struct ieee80211_vif *vif)
 146 {
 147         struct rt2x00_dev *rt2x00dev = data;
 148         struct sk_buff *skb;
 149
 150         /*
 151          * Only AP mode interfaces do broad- and multicast buffering
 152          */
 153         if (vif->type != NL80211_IFTYPE_AP)
 154                 return;
 155
 156         /*
 157          * Send out buffered broad- and multicast frames
 158          */
 159         skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 160         while (skb) {
 161                 rt2x00mac_tx(rt2x00dev->hw, skb);
 162                 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 163         }
 164 }
 165
 166 static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac,
 167                                         struct ieee80211_vif *vif)
 168 {
 169         struct rt2x00_dev *rt2x00dev = data;
 170
 171         if (vif->type != NL80211_IFTYPE_AP &&
 172             vif->type != NL80211_IFTYPE_ADHOC &&
 173             vif->type != NL80211_IFTYPE_MESH_POINT &&
 174             vif->type != NL80211_IFTYPE_WDS)
 175                 return;
 176
 177         /*
 178          * Update the beacon without locking. This is safe on PCI devices
 179          * as they only update the beacon periodically here. This should
 180          * never be called for USB devices.
 181          */
 182         WARN_ON(rt2x00_is_usb(rt2x00dev));
 183         rt2x00queue_update_beacon_locked(rt2x00dev, vif);
 184 }
 185
 186 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 187 {
 188         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 189                 return;
 190
 191         /* send buffered bc/mc frames out for every bssid */
 192         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 193                                                    rt2x00lib_bc_buffer_iter,
 194                                                    rt2x00dev);
 195         /*
 196          * Devices with pre tbtt interrupt don't need to update the beacon
 197          * here as they will fetch the next beacon directly prior to
 198          * transmission.
 199          */
 200         if (test_bit(DRIVER_SUPPORT_PRE_TBTT_INTERRUPT, &rt2x00dev->flags))
 201                 return;
 202
 203         /* fetch next beacon */
 204         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 205                                                    rt2x00lib_beaconupdate_iter,
 206                                                    rt2x00dev);
 207 }
 208 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 209
 210 void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev)
 211 {
 212         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 213                 return;
 214
 215         /* fetch next beacon */
 216         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 217                                                    rt2x00lib_beaconupdate_iter,
 218                                                    rt2x00dev);
 219 }
 220 EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
 221
 222 void rt2x00lib_dmastart(struct queue_entry *entry)
 223 {
 224         set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 225         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 226 }
 227 EXPORT_SYMBOL_GPL(rt2x00lib_dmastart);
 228
 229 void rt2x00lib_dmadone(struct queue_entry *entry)
 230 {
 231         set_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags);
 232         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 233         rt2x00queue_index_inc(entry->queue, Q_INDEX_DMA_DONE);
 234 }
 235 EXPORT_SYMBOL_GPL(rt2x00lib_dmadone);
 236
 237 void rt2x00lib_txdone(struct queue_entry *entry,
 238                       struct txdone_entry_desc *txdesc)
 239 {
 240         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 241         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 242         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 243         unsigned int header_length, i;
 244         u8 rate_idx, rate_flags, retry_rates;
 245         u8 skbdesc_flags = skbdesc->flags;
 246         bool success;
 247
 248         /*
 249          * Unmap the skb.
 250          */
 251         rt2x00queue_unmap_skb(entry);
 252
 253         /*
 254          * Remove the extra tx headroom from the skb.
 255          */
 256         skb_pull(entry->skb, rt2x00dev->ops->extra_tx_headroom);
 257
 258         /*
 259          * Signal that the TX descriptor is no longer in the skb.
 260          */
 261         skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
 262
 263         /*
 264          * Determine the length of 802.11 header.
 265          */
 266         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 267
 268         /*
 269          * Remove L2 padding which was added during
 270          */
 271         if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
 272                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 273
 274         /*
 275          * If the IV/EIV data was stripped from the frame before it was
 276          * passed to the hardware, we should now reinsert it again because
 277          * mac80211 will expect the same data to be present it the
 278          * frame as it was passed to us.
 279          */
 280         if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
 281                 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
 282
 283         /*
 284          * Send frame to debugfs immediately, after this call is completed
 285          * we are going to overwrite the skb->cb array.
 286          */
 287         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 288
 289         /*
 290          * Determine if the frame has been successfully transmitted.
 291          */
 292         success =
 293             test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 294             test_bit(TXDONE_UNKNOWN, &txdesc->flags);
 295
 296         /*
 297          * Update TX statistics.
 298          */
 299         rt2x00dev->link.qual.tx_success += success;
 300         rt2x00dev->link.qual.tx_failed += !success;
 301
 302         rate_idx = skbdesc->tx_rate_idx;
 303         rate_flags = skbdesc->tx_rate_flags;
 304         retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
 305             (txdesc->retry + 1) : 1;
 306
 307         /*
 308          * Initialize TX status
 309          */
 310         memset(&tx_info->status, 0, sizeof(tx_info->status));
 311         tx_info->status.ack_signal = 0;
 312
 313         /*
 314          * Frame was send with retries, hardware tried
 315          * different rates to send out the frame, at each
 316          * retry it lowered the rate 1 step except when the
 317          * lowest rate was used.
 318          */
 319         for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
 320                 tx_info->status.rates[i].idx = rate_idx - i;
 321                 tx_info->status.rates[i].flags = rate_flags;
 322
 323                 if (rate_idx - i == 0) {
 324                         /*
 325                          * The lowest rate (index 0) was used until the
 326                          * number of max retries was reached.
 327                          */
 328                         tx_info->status.rates[i].count = retry_rates - i;
 329                         i++;
 330                         break;
 331                 }
 332                 tx_info->status.rates[i].count = 1;
 333         }
 334         if (i < (IEEE80211_TX_MAX_RATES - 1))
 335                 tx_info->status.rates[i].idx = -1; /* terminate */
 336
 337         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 338                 if (success)
 339                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 340                 else
 341                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 342         }
 343
 344         /*
 345          * Every single frame has it's own tx status, hence report
 346          * every frame as ampdu of size 1.
 347          *
 348          * TODO: if we can find out how many frames were aggregated
 349          * by the hw we could provide the real ampdu_len to mac80211
 350          * which would allow the rc algorithm to better decide on
 351          * which rates are suitable.
 352          */
 353         if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 354                 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
 355                 tx_info->status.ampdu_len = 1;
 356                 tx_info->status.ampdu_ack_len = success ? 1 : 0;
 357         }
 358
 359         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 360                 if (success)
 361                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 362                 else
 363                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 364         }
 365
 366         /*
 367          * Only send the status report to mac80211 when it's a frame
 368          * that originated in mac80211. If this was a extra frame coming
 369          * through a mac80211 library call (RTS/CTS) then we should not
 370          * send the status report back.
 371          */
 372         if (!(skbdesc_flags & SKBDESC_NOT_MAC80211)) {
 373                 if (test_bit(DRIVER_REQUIRE_TASKLET_CONTEXT, &rt2x00dev->flags))
 374                         ieee80211_tx_status(rt2x00dev->hw, entry->skb);
 375                 else
 376                         ieee80211_tx_status_ni(rt2x00dev->hw, entry->skb);
 377         } else
 378                 dev_kfree_skb_any(entry->skb);
 379
 380         /*
 381          * Make this entry available for reuse.
 382          */
 383         entry->skb = NULL;
 384         entry->flags = 0;
 385
 386         rt2x00dev->ops->lib->clear_entry(entry);
 387
 388         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 389
 390         /*
 391          * If the data queue was below the threshold before the txdone
 392          * handler we must make sure the packet queue in the mac80211 stack
 393          * is reenabled when the txdone handler has finished.
 394          */
 395         if (!rt2x00queue_threshold(entry->queue))
 396                 rt2x00queue_unpause_queue(entry->queue);
 397 }
 398 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 399
 400 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
 401 {
 402         struct txdone_entry_desc txdesc;
 403
 404         txdesc.flags = 0;
 405         __set_bit(status, &txdesc.flags);
 406         txdesc.retry = 0;
 407
 408         rt2x00lib_txdone(entry, &txdesc);
 409 }
 410 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
 411
 412 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 413                                         struct rxdone_entry_desc *rxdesc)
 414 {
 415         struct ieee80211_supported_band *sband;
 416         const struct rt2x00_rate *rate;
 417         unsigned int i;
 418         int signal = rxdesc->signal;
 419         int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 420
 421         switch (rxdesc->rate_mode) {
 422         case RATE_MODE_CCK:
 423         case RATE_MODE_OFDM:
 424                 /*
 425                  * For non-HT rates the MCS value needs to contain the
 426                  * actually used rate modulation (CCK or OFDM).
 427                  */
 428                 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 429                         signal = RATE_MCS(rxdesc->rate_mode, signal);
 430
 431                 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 432                 for (i = 0; i < sband->n_bitrates; i++) {
 433                         rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 434                         if (((type == RXDONE_SIGNAL_PLCP) &&
 435                              (rate->plcp == signal)) ||
 436                             ((type == RXDONE_SIGNAL_BITRATE) &&
 437                               (rate->bitrate == signal)) ||
 438                             ((type == RXDONE_SIGNAL_MCS) &&
 439                               (rate->mcs == signal))) {
 440                                 return i;
 441                         }
 442                 }
 443                 break;
 444         case RATE_MODE_HT_MIX:
 445         case RATE_MODE_HT_GREENFIELD:
 446                 if (signal >= 0 && signal <= 76)
 447                         return signal;
 448                 break;
 449         default:
 450                 break;
 451         }
 452
 453         WARNING(rt2x00dev, "Frame received with unrecognized signal, "
 454                 "mode=0x%.4x, signal=0x%.4x, type=%d.\n",
 455                 rxdesc->rate_mode, signal, type);
 456         return 0;
 457 }
 458
 459 void rt2x00lib_rxdone(struct queue_entry *entry)
 460 {
 461         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 462         struct rxdone_entry_desc rxdesc;
 463         struct sk_buff *skb;
 464         struct ieee80211_rx_status *rx_status;
 465         unsigned int header_length;
 466         int rate_idx;
 467
 468         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 469             !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 470                 goto submit_entry;
 471
 472         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 473                 goto submit_entry;
 474
 475         /*
 476          * Allocate a new sk_buffer. If no new buffer available, drop the
 477          * received frame and reuse the existing buffer.
 478          */
 479         skb = rt2x00queue_alloc_rxskb(entry);
 480         if (!skb)
 481                 goto submit_entry;
 482
 483         /*
 484          * Unmap the skb.
 485          */
 486         rt2x00queue_unmap_skb(entry);
 487
 488         /*
 489          * Extract the RXD details.
 490          */
 491         memset(&rxdesc, 0, sizeof(rxdesc));
 492         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 493
 494         /*
 495          * The data behind the ieee80211 header must be
 496          * aligned on a 4 byte boundary.
 497          */
 498         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 499
 500         /*
 501          * Hardware might have stripped the IV/EIV/ICV data,
 502          * in that case it is possible that the data was
 503          * provided separately (through hardware descriptor)
 504          * in which case we should reinsert the data into the frame.
 505          */
 506         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 507             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 508                 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
 509                                           &rxdesc);
 510         else if (header_length &&
 511                  (rxdesc.size > header_length) &&
 512                  (rxdesc.dev_flags & RXDONE_L2PAD))
 513                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 514         else
 515                 rt2x00queue_align_payload(entry->skb, header_length);
 516
 517         /* Trim buffer to correct size */
 518         skb_trim(entry->skb, rxdesc.size);
 519
 520         /*
 521          * Translate the signal to the correct bitrate index.
 522          */
 523         rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 524         if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
 525             rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
 526                 rxdesc.flags |= RX_FLAG_HT;
 527
 528         /*
 529          * Update extra components
 530          */
 531         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 532         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 533         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 534
 535         /*
 536          * Initialize RX status information, and send frame
 537          * to mac80211.
 538          */
 539         rx_status = IEEE80211_SKB_RXCB(entry->skb);
 540         rx_status->mactime = rxdesc.timestamp;
 541         rx_status->band = rt2x00dev->curr_band;
 542         rx_status->freq = rt2x00dev->curr_freq;
 543         rx_status->rate_idx = rate_idx;
 544         rx_status->signal = rxdesc.rssi;
 545         rx_status->flag = rxdesc.flags;
 546         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 547
 548         ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
 549
 550         /*
 551          * Replace the skb with the freshly allocated one.
 552          */
 553         entry->skb = skb;
 554
 555 submit_entry:
 556         entry->flags = 0;
 557         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 558         if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
 559             test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 560                 rt2x00dev->ops->lib->clear_entry(entry);
 561 }
 562 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 563
 564 /*
 565  * Driver initialization handlers.
 566  */
 567 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 568         {
 569                 .flags = DEV_RATE_CCK,
 570                 .bitrate = 10,
 571                 .ratemask = BIT(0),
 572                 .plcp = 0x00,
 573                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 574         },
 575         {
 576                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 577                 .bitrate = 20,
 578                 .ratemask = BIT(1),
 579                 .plcp = 0x01,
 580                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 581         },
 582         {
 583                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 584                 .bitrate = 55,
 585                 .ratemask = BIT(2),
 586                 .plcp = 0x02,
 587                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 588         },
 589         {
 590                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 591                 .bitrate = 110,
 592                 .ratemask = BIT(3),
 593                 .plcp = 0x03,
 594                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 595         },
 596         {
 597                 .flags = DEV_RATE_OFDM,
 598                 .bitrate = 60,
 599                 .ratemask = BIT(4),
 600                 .plcp = 0x0b,
 601                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 602         },
 603         {
 604                 .flags = DEV_RATE_OFDM,
 605                 .bitrate = 90,
 606                 .ratemask = BIT(5),
 607                 .plcp = 0x0f,
 608                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 609         },
 610         {
 611                 .flags = DEV_RATE_OFDM,
 612                 .bitrate = 120,
 613                 .ratemask = BIT(6),
 614                 .plcp = 0x0a,
 615                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 616         },
 617         {
 618                 .flags = DEV_RATE_OFDM,
 619                 .bitrate = 180,
 620                 .ratemask = BIT(7),
 621                 .plcp = 0x0e,
 622                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 623         },
 624         {
 625                 .flags = DEV_RATE_OFDM,
 626                 .bitrate = 240,
 627                 .ratemask = BIT(8),
 628                 .plcp = 0x09,
 629                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 630         },
 631         {
 632                 .flags = DEV_RATE_OFDM,
 633                 .bitrate = 360,
 634                 .ratemask = BIT(9),
 635                 .plcp = 0x0d,
 636                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 637         },
 638         {
 639                 .flags = DEV_RATE_OFDM,
 640                 .bitrate = 480,
 641                 .ratemask = BIT(10),
 642                 .plcp = 0x08,
 643                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 644         },
 645         {
 646                 .flags = DEV_RATE_OFDM,
 647                 .bitrate = 540,
 648                 .ratemask = BIT(11),
 649                 .plcp = 0x0c,
 650                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 651         },
 652 };
 653
 654 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 655                               const int channel, const int tx_power,
 656                               const int value)
 657 {
 658         /* XXX: this assumption about the band is wrong for 802.11j */
 659         entry->band = channel <= 14 ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 660         entry->center_freq = ieee80211_channel_to_frequency(channel,
 661                                                             entry->band);
 662         entry->hw_value = value;
 663         entry->max_power = tx_power;
 664         entry->max_antenna_gain = 0xff;
 665 }
 666
 667 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 668                            const u16 index, const struct rt2x00_rate *rate)
 669 {
 670         entry->flags = 0;
 671         entry->bitrate = rate->bitrate;
 672         entry->hw_value = index;
 673         entry->hw_value_short = index;
 674
 675         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 676                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 677 }
 678
 679 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 680                                     struct hw_mode_spec *spec)
 681 {
 682         struct ieee80211_hw *hw = rt2x00dev->hw;
 683         struct ieee80211_channel *channels;
 684         struct ieee80211_rate *rates;
 685         unsigned int num_rates;
 686         unsigned int i;
 687
 688         num_rates = 0;
 689         if (spec->supported_rates & SUPPORT_RATE_CCK)
 690                 num_rates += 4;
 691         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 692                 num_rates += 8;
 693
 694         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 695         if (!channels)
 696                 return -ENOMEM;
 697
 698         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 699         if (!rates)
 700                 goto exit_free_channels;
 701
 702         /*
 703          * Initialize Rate list.
 704          */
 705         for (i = 0; i < num_rates; i++)
 706                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 707
 708         /*
 709          * Initialize Channel list.
 710          */
 711         for (i = 0; i < spec->num_channels; i++) {
 712                 rt2x00lib_channel(&channels[i],
 713                                   spec->channels[i].channel,
 714                                   spec->channels_info[i].max_power, i);
 715         }
 716
 717         /*
 718          * Intitialize 802.11b, 802.11g
 719          * Rates: CCK, OFDM.
 720          * Channels: 2.4 GHz
 721          */
 722         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 723                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 724                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 725                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 726                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 727                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 728                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 729                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
 730                        &spec->ht, sizeof(spec->ht));
 731         }
 732
 733         /*
 734          * Intitialize 802.11a
 735          * Rates: OFDM.
 736          * Channels: OFDM, UNII, HiperLAN2.
 737          */
 738         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 739                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 740                     spec->num_channels - 14;
 741                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 742                     num_rates - 4;
 743                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 744                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 745                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 746                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 747                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
 748                        &spec->ht, sizeof(spec->ht));
 749         }
 750
 751         return 0;
 752
 753  exit_free_channels:
 754         kfree(channels);
 755         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 756         return -ENOMEM;
 757 }
 758
 759 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 760 {
 761         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 762                 ieee80211_unregister_hw(rt2x00dev->hw);
 763
 764         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 765                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 766                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 767                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 768                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 769         }
 770
 771         kfree(rt2x00dev->spec.channels_info);
 772 }
 773
 774 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 775 {
 776         struct hw_mode_spec *spec = &rt2x00dev->spec;
 777         int status;
 778
 779         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 780                 return 0;
 781
 782         /*
 783          * Initialize HW modes.
 784          */
 785         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 786         if (status)
 787                 return status;
 788
 789         /*
 790          * Initialize HW fields.
 791          */
 792         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 793
 794         /*
 795          * Initialize extra TX headroom required.
 796          */
 797         rt2x00dev->hw->extra_tx_headroom =
 798                 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
 799                       rt2x00dev->ops->extra_tx_headroom);
 800
 801         /*
 802          * Take TX headroom required for alignment into account.
 803          */
 804         if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
 805                 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
 806         else if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags))
 807                 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
 808
 809         /*
 810          * Allocate tx status FIFO for driver use.
 811          */
 812         if (test_bit(DRIVER_REQUIRE_TXSTATUS_FIFO, &rt2x00dev->flags)) {
 813                 /*
 814                  * Allocate txstatus fifo and tasklet, we use a size of 512
 815                  * for the kfifo which is big enough to store 512/4=128 tx
 816                  * status reports. In the worst case (tx status for all tx
 817                  * queues gets reported before we've got a chance to handle
 818                  * them) 24*4=384 tx status reports need to be cached.
 819                  */
 820                 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, 512,
 821                                      GFP_KERNEL);
 822                 if (status)
 823                         return status;
 824         }
 825
 826         /*
 827          * Initialize tasklets if used by the driver. Tasklets are
 828          * disabled until the interrupts are turned on. The driver
 829          * has to handle that.
 830          */
 831 #define RT2X00_TASKLET_INIT(taskletname) \
 832         if (rt2x00dev->ops->lib->taskletname) { \
 833                 tasklet_init(&rt2x00dev->taskletname, \
 834                              rt2x00dev->ops->lib->taskletname, \
 835                              (unsigned long)rt2x00dev); \
 836                 tasklet_disable(&rt2x00dev->taskletname); \
 837         }
 838
 839         RT2X00_TASKLET_INIT(txstatus_tasklet);
 840         RT2X00_TASKLET_INIT(pretbtt_tasklet);
 841         RT2X00_TASKLET_INIT(tbtt_tasklet);
 842         RT2X00_TASKLET_INIT(rxdone_tasklet);
 843         RT2X00_TASKLET_INIT(autowake_tasklet);
 844
 845 #undef RT2X00_TASKLET_INIT
 846
 847         /*
 848          * Register HW.
 849          */
 850         status = ieee80211_register_hw(rt2x00dev->hw);
 851         if (status)
 852                 return status;
 853
 854         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 855
 856         return 0;
 857 }
 858
 859 /*
 860  * Initialization/uninitialization handlers.
 861  */
 862 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 863 {
 864         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 865                 return;
 866
 867         /*
 868          * Unregister extra components.
 869          */
 870         rt2x00rfkill_unregister(rt2x00dev);
 871
 872         /*
 873          * Allow the HW to uninitialize.
 874          */
 875         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 876
 877         /*
 878          * Free allocated queue entries.
 879          */
 880         rt2x00queue_uninitialize(rt2x00dev);
 881 }
 882
 883 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 884 {
 885         int status;
 886
 887         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 888                 return 0;
 889
 890         /*
 891          * Allocate all queue entries.
 892          */
 893         status = rt2x00queue_initialize(rt2x00dev);
 894         if (status)
 895                 return status;
 896
 897         /*
 898          * Initialize the device.
 899          */
 900         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 901         if (status) {
 902                 rt2x00queue_uninitialize(rt2x00dev);
 903                 return status;
 904         }
 905
 906         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
 907
 908         /*
 909          * Register the extra components.
 910          */
 911         rt2x00rfkill_register(rt2x00dev);
 912
 913         return 0;
 914 }
 915
 916 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 917 {
 918         int retval;
 919
 920         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 921                 return 0;
 922
 923         /*
 924          * If this is the first interface which is added,
 925          * we should load the firmware now.
 926          */
 927         retval = rt2x00lib_load_firmware(rt2x00dev);
 928         if (retval)
 929                 return retval;
 930
 931         /*
 932          * Initialize the device.
 933          */
 934         retval = rt2x00lib_initialize(rt2x00dev);
 935         if (retval)
 936                 return retval;
 937
 938         rt2x00dev->intf_ap_count = 0;
 939         rt2x00dev->intf_sta_count = 0;
 940         rt2x00dev->intf_associated = 0;
 941
 942         /* Enable the radio */
 943         retval = rt2x00lib_enable_radio(rt2x00dev);
 944         if (retval)
 945                 return retval;
 946
 947         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
 948
 949         return 0;
 950 }
 951
 952 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
 953 {
 954         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 955                 return;
 956
 957         /*
 958          * Perhaps we can add something smarter here,
 959          * but for now just disabling the radio should do.
 960          */
 961         rt2x00lib_disable_radio(rt2x00dev);
 962
 963         rt2x00dev->intf_ap_count = 0;
 964         rt2x00dev->intf_sta_count = 0;
 965         rt2x00dev->intf_associated = 0;
 966 }
 967
 968 /*
 969  * driver allocation handlers.
 970  */
 971 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 972 {
 973         int retval = -ENOMEM;
 974
 975         spin_lock_init(&rt2x00dev->irqmask_lock);
 976         mutex_init(&rt2x00dev->csr_mutex);
 977
 978         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 979
 980         /*
 981          * Make room for rt2x00_intf inside the per-interface
 982          * structure ieee80211_vif.
 983          */
 984         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
 985
 986         /*
 987          * Determine which operating modes are supported, all modes
 988          * which require beaconing, depend on the availability of
 989          * beacon entries.
 990          */
 991         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
 992         if (rt2x00dev->ops->bcn->entry_num > 0)
 993                 rt2x00dev->hw->wiphy->interface_modes |=
 994                     BIT(NL80211_IFTYPE_ADHOC) |
 995                     BIT(NL80211_IFTYPE_AP) |
 996                     BIT(NL80211_IFTYPE_MESH_POINT) |
 997                     BIT(NL80211_IFTYPE_WDS);
 998
 999         /*
1000          * Initialize work.
1001          */
1002         rt2x00dev->workqueue =
1003             alloc_ordered_workqueue(wiphy_name(rt2x00dev->hw->wiphy), 0);
1004         if (!rt2x00dev->workqueue) {
1005                 retval = -ENOMEM;
1006                 goto exit;
1007         }
1008
1009         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1010
1011         /*
1012          * Let the driver probe the device to detect the capabilities.
1013          */
1014         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1015         if (retval) {
1016                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1017                 goto exit;
1018         }
1019
1020         /*
1021          * Allocate queue array.
1022          */
1023         retval = rt2x00queue_allocate(rt2x00dev);
1024         if (retval)
1025                 goto exit;
1026
1027         /*
1028          * Initialize ieee80211 structure.
1029          */
1030         retval = rt2x00lib_probe_hw(rt2x00dev);
1031         if (retval) {
1032                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1033                 goto exit;
1034         }
1035
1036         /*
1037          * Register extra components.
1038          */
1039         rt2x00link_register(rt2x00dev);
1040         rt2x00leds_register(rt2x00dev);
1041         rt2x00debug_register(rt2x00dev);
1042
1043         return 0;
1044
1045 exit:
1046         rt2x00lib_remove_dev(rt2x00dev);
1047
1048         return retval;
1049 }
1050 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1051
1052 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1053 {
1054         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1055
1056         /*
1057          * Disable radio.
1058          */
1059         rt2x00lib_disable_radio(rt2x00dev);
1060
1061         /*
1062          * Stop all work.
1063          */
1064         cancel_work_sync(&rt2x00dev->intf_work);
1065         if (rt2x00_is_usb(rt2x00dev)) {
1066                 cancel_work_sync(&rt2x00dev->rxdone_work);
1067                 cancel_work_sync(&rt2x00dev->txdone_work);
1068         }
1069         destroy_workqueue(rt2x00dev->workqueue);
1070
1071         /*
1072          * Free the tx status fifo.
1073          */
1074         kfifo_free(&rt2x00dev->txstatus_fifo);
1075
1076         /*
1077          * Kill the tx status tasklet.
1078          */
1079         tasklet_kill(&rt2x00dev->txstatus_tasklet);
1080         tasklet_kill(&rt2x00dev->pretbtt_tasklet);
1081         tasklet_kill(&rt2x00dev->tbtt_tasklet);
1082         tasklet_kill(&rt2x00dev->rxdone_tasklet);
1083         tasklet_kill(&rt2x00dev->autowake_tasklet);
1084
1085         /*
1086          * Uninitialize device.
1087          */
1088         rt2x00lib_uninitialize(rt2x00dev);
1089
1090         /*
1091          * Free extra components
1092          */
1093         rt2x00debug_deregister(rt2x00dev);
1094         rt2x00leds_unregister(rt2x00dev);
1095
1096         /*
1097          * Free ieee80211_hw memory.
1098          */
1099         rt2x00lib_remove_hw(rt2x00dev);
1100
1101         /*
1102          * Free firmware image.
1103          */
1104         rt2x00lib_free_firmware(rt2x00dev);
1105
1106         /*
1107          * Free queue structures.
1108          */
1109         rt2x00queue_free(rt2x00dev);
1110 }
1111 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1112
1113 /*
1114  * Device state handlers
1115  */
1116 #ifdef CONFIG_PM
1117 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1118 {
1119         NOTICE(rt2x00dev, "Going to sleep.\n");
1120
1121         /*
1122          * Prevent mac80211 from accessing driver while suspended.
1123          */
1124         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1125                 return 0;
1126
1127         /*
1128          * Cleanup as much as possible.
1129          */
1130         rt2x00lib_uninitialize(rt2x00dev);
1131
1132         /*
1133          * Suspend/disable extra components.
1134          */
1135         rt2x00leds_suspend(rt2x00dev);
1136         rt2x00debug_deregister(rt2x00dev);
1137
1138         /*
1139          * Set device mode to sleep for power management,
1140          * on some hardware this call seems to consistently fail.
1141          * From the specifications it is hard to tell why it fails,
1142          * and if this is a "bad thing".
1143          * Overall it is safe to just ignore the failure and
1144          * continue suspending. The only downside is that the
1145          * device will not be in optimal power save mode, but with
1146          * the radio and the other components already disabled the
1147          * device is as good as disabled.
1148          */
1149         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1150                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1151                         "continue suspending.\n");
1152
1153         return 0;
1154 }
1155 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1156
1157 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1158 {
1159         NOTICE(rt2x00dev, "Waking up.\n");
1160
1161         /*
1162          * Restore/enable extra components.
1163          */
1164         rt2x00debug_register(rt2x00dev);
1165         rt2x00leds_resume(rt2x00dev);
1166
1167         /*
1168          * We are ready again to receive requests from mac80211.
1169          */
1170         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1171
1172         return 0;
1173 }
1174 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1175 #endif /* CONFIG_PM */
1176
1177 /*
1178  * rt2x00lib module information.
1179  */
1180 MODULE_AUTHOR(DRV_PROJECT);
1181 MODULE_VERSION(DRV_VERSION);
1182 MODULE_DESCRIPTION("rt2x00 library");
1183 MODULE_LICENSE("GPL");