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 RX.
  70          */
  71         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
  72
  73         /*
  74          * Start watchdog monitoring.
  75          */
  76         rt2x00link_start_watchdog(rt2x00dev);
  77
  78         /*
  79          * Start the TX queues.
  80          */
  81         ieee80211_wake_queues(rt2x00dev->hw);
  82
  83         return 0;
  84 }
  85
  86 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
  87 {
  88         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  89                 return;
  90
  91         /*
  92          * Stop the TX queues in mac80211.
  93          */
  94         ieee80211_stop_queues(rt2x00dev->hw);
  95         rt2x00queue_stop_queues(rt2x00dev);
  96
  97         /*
  98          * Stop watchdog monitoring.
  99          */
 100         rt2x00link_stop_watchdog(rt2x00dev);
 101
 102         /*
 103          * Disable RX.
 104          */
 105         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 106
 107         /*
 108          * Disable radio.
 109          */
 110         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 111         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 112         rt2x00led_led_activity(rt2x00dev, false);
 113         rt2x00leds_led_radio(rt2x00dev, false);
 114 }
 115
 116 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 117 {
 118         /*
 119          * When we are disabling the RX, we should also stop the link tuner.
 120          */
 121         if (state == STATE_RADIO_RX_OFF)
 122                 rt2x00link_stop_tuner(rt2x00dev);
 123
 124         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 125
 126         /*
 127          * When we are enabling the RX, we should also start the link tuner.
 128          */
 129         if (state == STATE_RADIO_RX_ON)
 130                 rt2x00link_start_tuner(rt2x00dev);
 131 }
 132
 133 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 134                                           struct ieee80211_vif *vif)
 135 {
 136         struct rt2x00_dev *rt2x00dev = data;
 137         struct rt2x00_intf *intf = vif_to_intf(vif);
 138         int delayed_flags;
 139
 140         /*
 141          * Copy all data we need during this action under the protection
 142          * of a spinlock. Otherwise race conditions might occur which results
 143          * into an invalid configuration.
 144          */
 145         spin_lock(&intf->lock);
 146
 147         delayed_flags = intf->delayed_flags;
 148         intf->delayed_flags = 0;
 149
 150         spin_unlock(&intf->lock);
 151
 152         /*
 153          * It is possible the radio was disabled while the work had been
 154          * scheduled. If that happens we should return here immediately,
 155          * note that in the spinlock protected area above the delayed_flags
 156          * have been cleared correctly.
 157          */
 158         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 159                 return;
 160
 161         if (delayed_flags & DELAYED_UPDATE_BEACON)
 162                 rt2x00queue_update_beacon(rt2x00dev, vif, true);
 163 }
 164
 165 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 166 {
 167         struct rt2x00_dev *rt2x00dev =
 168             container_of(work, struct rt2x00_dev, intf_work);
 169
 170         /*
 171          * Iterate over each interface and perform the
 172          * requested configurations.
 173          */
 174         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 175                                             rt2x00lib_intf_scheduled_iter,
 176                                             rt2x00dev);
 177 }
 178
 179 /*
 180  * Interrupt context handlers.
 181  */
 182 static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac,
 183                                      struct ieee80211_vif *vif)
 184 {
 185         struct rt2x00_dev *rt2x00dev = data;
 186         struct sk_buff *skb;
 187
 188         /*
 189          * Only AP mode interfaces do broad- and multicast buffering
 190          */
 191         if (vif->type != NL80211_IFTYPE_AP)
 192                 return;
 193
 194         /*
 195          * Send out buffered broad- and multicast frames
 196          */
 197         skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 198         while (skb) {
 199                 rt2x00mac_tx(rt2x00dev->hw, skb);
 200                 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 201         }
 202 }
 203
 204 static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac,
 205                                         struct ieee80211_vif *vif)
 206 {
 207         struct rt2x00_dev *rt2x00dev = data;
 208
 209         if (vif->type != NL80211_IFTYPE_AP &&
 210             vif->type != NL80211_IFTYPE_ADHOC &&
 211             vif->type != NL80211_IFTYPE_MESH_POINT &&
 212             vif->type != NL80211_IFTYPE_WDS)
 213                 return;
 214
 215         rt2x00queue_update_beacon(rt2x00dev, vif, true);
 216 }
 217
 218 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 219 {
 220         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 221                 return;
 222
 223         /* send buffered bc/mc frames out for every bssid */
 224         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 225                                             rt2x00lib_bc_buffer_iter,
 226                                             rt2x00dev);
 227         /*
 228          * Devices with pre tbtt interrupt don't need to update the beacon
 229          * here as they will fetch the next beacon directly prior to
 230          * transmission.
 231          */
 232         if (test_bit(DRIVER_SUPPORT_PRE_TBTT_INTERRUPT, &rt2x00dev->flags))
 233                 return;
 234
 235         /* fetch next beacon */
 236         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 237                                             rt2x00lib_beaconupdate_iter,
 238                                             rt2x00dev);
 239 }
 240 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 241
 242 void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev)
 243 {
 244         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 245                 return;
 246
 247         /* fetch next beacon */
 248         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 249                                             rt2x00lib_beaconupdate_iter,
 250                                             rt2x00dev);
 251 }
 252 EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
 253
 254 void rt2x00lib_dmadone(struct queue_entry *entry)
 255 {
 256         rt2x00queue_index_inc(entry->queue, Q_INDEX_DMA_DONE);
 257 }
 258 EXPORT_SYMBOL_GPL(rt2x00lib_dmadone);
 259
 260 void rt2x00lib_txdone(struct queue_entry *entry,
 261                       struct txdone_entry_desc *txdesc)
 262 {
 263         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 264         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 265         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 266         enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
 267         unsigned int header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 268         u8 rate_idx, rate_flags, retry_rates;
 269         u8 skbdesc_flags = skbdesc->flags;
 270         unsigned int i;
 271         bool success;
 272
 273         /*
 274          * Unmap the skb.
 275          */
 276         rt2x00queue_unmap_skb(entry);
 277
 278         /*
 279          * Remove the extra tx headroom from the skb.
 280          */
 281         skb_pull(entry->skb, rt2x00dev->ops->extra_tx_headroom);
 282
 283         /*
 284          * Signal that the TX descriptor is no longer in the skb.
 285          */
 286         skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
 287
 288         /*
 289          * Remove L2 padding which was added during
 290          */
 291         if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
 292                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 293
 294         /*
 295          * If the IV/EIV data was stripped from the frame before it was
 296          * passed to the hardware, we should now reinsert it again because
 297          * mac80211 will expect the same data to be present it the
 298          * frame as it was passed to us.
 299          */
 300         if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
 301                 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
 302
 303         /*
 304          * Send frame to debugfs immediately, after this call is completed
 305          * we are going to overwrite the skb->cb array.
 306          */
 307         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 308
 309         /*
 310          * Determine if the frame has been successfully transmitted.
 311          */
 312         success =
 313             test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 314             test_bit(TXDONE_UNKNOWN, &txdesc->flags);
 315
 316         /*
 317          * Update TX statistics.
 318          */
 319         rt2x00dev->link.qual.tx_success += success;
 320         rt2x00dev->link.qual.tx_failed += !success;
 321
 322         rate_idx = skbdesc->tx_rate_idx;
 323         rate_flags = skbdesc->tx_rate_flags;
 324         retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
 325             (txdesc->retry + 1) : 1;
 326
 327         /*
 328          * Initialize TX status
 329          */
 330         memset(&tx_info->status, 0, sizeof(tx_info->status));
 331         tx_info->status.ack_signal = 0;
 332
 333         /*
 334          * Frame was send with retries, hardware tried
 335          * different rates to send out the frame, at each
 336          * retry it lowered the rate 1 step except when the
 337          * lowest rate was used.
 338          */
 339         for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
 340                 tx_info->status.rates[i].idx = rate_idx - i;
 341                 tx_info->status.rates[i].flags = rate_flags;
 342
 343                 if (rate_idx - i == 0) {
 344                         /*
 345                          * The lowest rate (index 0) was used until the
 346                          * number of max retries was reached.
 347                          */
 348                         tx_info->status.rates[i].count = retry_rates - i;
 349                         i++;
 350                         break;
 351                 }
 352                 tx_info->status.rates[i].count = 1;
 353         }
 354         if (i < (IEEE80211_TX_MAX_RATES - 1))
 355                 tx_info->status.rates[i].idx = -1; /* terminate */
 356
 357         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 358                 if (success)
 359                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 360                 else
 361                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 362         }
 363
 364         /*
 365          * Every single frame has it's own tx status, hence report
 366          * every frame as ampdu of size 1.
 367          *
 368          * TODO: if we can find out how many frames were aggregated
 369          * by the hw we could provide the real ampdu_len to mac80211
 370          * which would allow the rc algorithm to better decide on
 371          * which rates are suitable.
 372          */
 373         if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 374                 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
 375                 tx_info->status.ampdu_len = 1;
 376                 tx_info->status.ampdu_ack_len = success ? 1 : 0;
 377         }
 378
 379         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 380                 if (success)
 381                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 382                 else
 383                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 384         }
 385
 386         /*
 387          * Only send the status report to mac80211 when it's a frame
 388          * that originated in mac80211. If this was a extra frame coming
 389          * through a mac80211 library call (RTS/CTS) then we should not
 390          * send the status report back.
 391          */
 392         if (!(skbdesc_flags & SKBDESC_NOT_MAC80211))
 393                 ieee80211_tx_status(rt2x00dev->hw, entry->skb);
 394         else
 395                 dev_kfree_skb_any(entry->skb);
 396
 397         /*
 398          * Make this entry available for reuse.
 399          */
 400         entry->skb = NULL;
 401         entry->flags = 0;
 402
 403         rt2x00dev->ops->lib->clear_entry(entry);
 404
 405         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 406
 407         /*
 408          * If the data queue was below the threshold before the txdone
 409          * handler we must make sure the packet queue in the mac80211 stack
 410          * is reenabled when the txdone handler has finished.
 411          */
 412         if (!rt2x00queue_threshold(entry->queue))
 413                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 414 }
 415 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 416
 417 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
 418 {
 419         struct txdone_entry_desc txdesc;
 420
 421         txdesc.flags = 0;
 422         __set_bit(status, &txdesc.flags);
 423         txdesc.retry = 0;
 424
 425         rt2x00lib_txdone(entry, &txdesc);
 426 }
 427 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
 428
 429 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 430                                         struct rxdone_entry_desc *rxdesc)
 431 {
 432         struct ieee80211_supported_band *sband;
 433         const struct rt2x00_rate *rate;
 434         unsigned int i;
 435         int signal = rxdesc->signal;
 436         int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 437
 438         switch (rxdesc->rate_mode) {
 439         case RATE_MODE_CCK:
 440         case RATE_MODE_OFDM:
 441                 /*
 442                  * For non-HT rates the MCS value needs to contain the
 443                  * actually used rate modulation (CCK or OFDM).
 444                  */
 445                 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 446                         signal = RATE_MCS(rxdesc->rate_mode, signal);
 447
 448                 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 449                 for (i = 0; i < sband->n_bitrates; i++) {
 450                         rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 451                         if (((type == RXDONE_SIGNAL_PLCP) &&
 452                              (rate->plcp == signal)) ||
 453                             ((type == RXDONE_SIGNAL_BITRATE) &&
 454                               (rate->bitrate == signal)) ||
 455                             ((type == RXDONE_SIGNAL_MCS) &&
 456                               (rate->mcs == signal))) {
 457                                 return i;
 458                         }
 459                 }
 460                 break;
 461         case RATE_MODE_HT_MIX:
 462         case RATE_MODE_HT_GREENFIELD:
 463                 if (signal >= 0 && signal <= 76)
 464                         return signal;
 465                 break;
 466         default:
 467                 break;
 468         }
 469
 470         WARNING(rt2x00dev, "Frame received with unrecognized signal, "
 471                 "mode=0x%.4x, signal=0x%.4x, type=%d.\n",
 472                 rxdesc->rate_mode, signal, type);
 473         return 0;
 474 }
 475
 476 void rt2x00lib_rxdone(struct queue_entry *entry)
 477 {
 478         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 479         struct rxdone_entry_desc rxdesc;
 480         struct sk_buff *skb;
 481         struct ieee80211_rx_status *rx_status;
 482         unsigned int header_length;
 483         int rate_idx;
 484
 485         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 486                 goto submit_entry;
 487
 488         /*
 489          * Allocate a new sk_buffer. If no new buffer available, drop the
 490          * received frame and reuse the existing buffer.
 491          */
 492         skb = rt2x00queue_alloc_rxskb(entry);
 493         if (!skb)
 494                 goto submit_entry;
 495
 496         /*
 497          * Unmap the skb.
 498          */
 499         rt2x00queue_unmap_skb(entry);
 500
 501         /*
 502          * Extract the RXD details.
 503          */
 504         memset(&rxdesc, 0, sizeof(rxdesc));
 505         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 506
 507         /*
 508          * The data behind the ieee80211 header must be
 509          * aligned on a 4 byte boundary.
 510          */
 511         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 512
 513         /*
 514          * Hardware might have stripped the IV/EIV/ICV data,
 515          * in that case it is possible that the data was
 516          * provided separately (through hardware descriptor)
 517          * in which case we should reinsert the data into the frame.
 518          */
 519         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 520             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 521                 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
 522                                           &rxdesc);
 523         else if (header_length &&
 524                  (rxdesc.size > header_length) &&
 525                  (rxdesc.dev_flags & RXDONE_L2PAD))
 526                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 527         else
 528                 rt2x00queue_align_payload(entry->skb, header_length);
 529
 530         /* Trim buffer to correct size */
 531         skb_trim(entry->skb, rxdesc.size);
 532
 533         /*
 534          * Translate the signal to the correct bitrate index.
 535          */
 536         rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 537         if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
 538             rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
 539                 rxdesc.flags |= RX_FLAG_HT;
 540
 541         /*
 542          * Update extra components
 543          */
 544         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 545         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 546         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 547
 548         /*
 549          * Initialize RX status information, and send frame
 550          * to mac80211.
 551          */
 552         rx_status = IEEE80211_SKB_RXCB(entry->skb);
 553         rx_status->mactime = rxdesc.timestamp;
 554         rx_status->band = rt2x00dev->curr_band;
 555         rx_status->freq = rt2x00dev->curr_freq;
 556         rx_status->rate_idx = rate_idx;
 557         rx_status->signal = rxdesc.rssi;
 558         rx_status->flag = rxdesc.flags;
 559         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 560
 561         ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
 562
 563         /*
 564          * Replace the skb with the freshly allocated one.
 565          */
 566         entry->skb = skb;
 567
 568 submit_entry:
 569         rt2x00dev->ops->lib->clear_entry(entry);
 570         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 571         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 572 }
 573 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 574
 575 /*
 576  * Driver initialization handlers.
 577  */
 578 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 579         {
 580                 .flags = DEV_RATE_CCK,
 581                 .bitrate = 10,
 582                 .ratemask = BIT(0),
 583                 .plcp = 0x00,
 584                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 585         },
 586         {
 587                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 588                 .bitrate = 20,
 589                 .ratemask = BIT(1),
 590                 .plcp = 0x01,
 591                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 592         },
 593         {
 594                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 595                 .bitrate = 55,
 596                 .ratemask = BIT(2),
 597                 .plcp = 0x02,
 598                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 599         },
 600         {
 601                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 602                 .bitrate = 110,
 603                 .ratemask = BIT(3),
 604                 .plcp = 0x03,
 605                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 606         },
 607         {
 608                 .flags = DEV_RATE_OFDM,
 609                 .bitrate = 60,
 610                 .ratemask = BIT(4),
 611                 .plcp = 0x0b,
 612                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 613         },
 614         {
 615                 .flags = DEV_RATE_OFDM,
 616                 .bitrate = 90,
 617                 .ratemask = BIT(5),
 618                 .plcp = 0x0f,
 619                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 620         },
 621         {
 622                 .flags = DEV_RATE_OFDM,
 623                 .bitrate = 120,
 624                 .ratemask = BIT(6),
 625                 .plcp = 0x0a,
 626                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 627         },
 628         {
 629                 .flags = DEV_RATE_OFDM,
 630                 .bitrate = 180,
 631                 .ratemask = BIT(7),
 632                 .plcp = 0x0e,
 633                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 634         },
 635         {
 636                 .flags = DEV_RATE_OFDM,
 637                 .bitrate = 240,
 638                 .ratemask = BIT(8),
 639                 .plcp = 0x09,
 640                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 641         },
 642         {
 643                 .flags = DEV_RATE_OFDM,
 644                 .bitrate = 360,
 645                 .ratemask = BIT(9),
 646                 .plcp = 0x0d,
 647                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 648         },
 649         {
 650                 .flags = DEV_RATE_OFDM,
 651                 .bitrate = 480,
 652                 .ratemask = BIT(10),
 653                 .plcp = 0x08,
 654                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 655         },
 656         {
 657                 .flags = DEV_RATE_OFDM,
 658                 .bitrate = 540,
 659                 .ratemask = BIT(11),
 660                 .plcp = 0x0c,
 661                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 662         },
 663 };
 664
 665 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 666                               const int channel, const int tx_power,
 667                               const int value)
 668 {
 669         entry->center_freq = ieee80211_channel_to_frequency(channel);
 670         entry->hw_value = value;
 671         entry->max_power = tx_power;
 672         entry->max_antenna_gain = 0xff;
 673 }
 674
 675 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 676                            const u16 index, const struct rt2x00_rate *rate)
 677 {
 678         entry->flags = 0;
 679         entry->bitrate = rate->bitrate;
 680         entry->hw_value =index;
 681         entry->hw_value_short = index;
 682
 683         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 684                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 685 }
 686
 687 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 688                                     struct hw_mode_spec *spec)
 689 {
 690         struct ieee80211_hw *hw = rt2x00dev->hw;
 691         struct ieee80211_channel *channels;
 692         struct ieee80211_rate *rates;
 693         unsigned int num_rates;
 694         unsigned int i;
 695
 696         num_rates = 0;
 697         if (spec->supported_rates & SUPPORT_RATE_CCK)
 698                 num_rates += 4;
 699         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 700                 num_rates += 8;
 701
 702         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 703         if (!channels)
 704                 return -ENOMEM;
 705
 706         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 707         if (!rates)
 708                 goto exit_free_channels;
 709
 710         /*
 711          * Initialize Rate list.
 712          */
 713         for (i = 0; i < num_rates; i++)
 714                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 715
 716         /*
 717          * Initialize Channel list.
 718          */
 719         for (i = 0; i < spec->num_channels; i++) {
 720                 rt2x00lib_channel(&channels[i],
 721                                   spec->channels[i].channel,
 722                                   spec->channels_info[i].max_power, i);
 723         }
 724
 725         /*
 726          * Intitialize 802.11b, 802.11g
 727          * Rates: CCK, OFDM.
 728          * Channels: 2.4 GHz
 729          */
 730         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 731                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 732                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 733                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 734                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 735                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 736                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 737                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
 738                        &spec->ht, sizeof(spec->ht));
 739         }
 740
 741         /*
 742          * Intitialize 802.11a
 743          * Rates: OFDM.
 744          * Channels: OFDM, UNII, HiperLAN2.
 745          */
 746         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 747                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 748                     spec->num_channels - 14;
 749                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 750                     num_rates - 4;
 751                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 752                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 753                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 754                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 755                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
 756                        &spec->ht, sizeof(spec->ht));
 757         }
 758
 759         return 0;
 760
 761  exit_free_channels:
 762         kfree(channels);
 763         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 764         return -ENOMEM;
 765 }
 766
 767 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 768 {
 769         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 770                 ieee80211_unregister_hw(rt2x00dev->hw);
 771
 772         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 773                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 774                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 775                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 776                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 777         }
 778
 779         kfree(rt2x00dev->spec.channels_info);
 780 }
 781
 782 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 783 {
 784         struct hw_mode_spec *spec = &rt2x00dev->spec;
 785         int status;
 786
 787         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 788                 return 0;
 789
 790         /*
 791          * Initialize HW modes.
 792          */
 793         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 794         if (status)
 795                 return status;
 796
 797         /*
 798          * Initialize HW fields.
 799          */
 800         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 801
 802         /*
 803          * Initialize extra TX headroom required.
 804          */
 805         rt2x00dev->hw->extra_tx_headroom =
 806                 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
 807                       rt2x00dev->ops->extra_tx_headroom);
 808
 809         /*
 810          * Take TX headroom required for alignment into account.
 811          */
 812         if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
 813                 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
 814         else if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags))
 815                 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
 816
 817         /*
 818          * Allocate tx status FIFO for driver use.
 819          */
 820         if (test_bit(DRIVER_REQUIRE_TXSTATUS_FIFO, &rt2x00dev->flags) &&
 821             rt2x00dev->ops->lib->txstatus_tasklet) {
 822                 /*
 823                  * Allocate txstatus fifo and tasklet, we use a size of 512
 824                  * for the kfifo which is big enough to store 512/4=128 tx
 825                  * status reports. In the worst case (tx status for all tx
 826                  * queues gets reported before we've got a chance to handle
 827                  * them) 24*4=384 tx status reports need to be cached.
 828                  */
 829                 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, 512,
 830                                      GFP_KERNEL);
 831                 if (status)
 832                         return status;
 833
 834                 /* tasklet for processing the tx status reports. */
 835                 tasklet_init(&rt2x00dev->txstatus_tasklet,
 836                              rt2x00dev->ops->lib->txstatus_tasklet,
 837                              (unsigned long)rt2x00dev);
 838
 839         }
 840
 841         /*
 842          * Register HW.
 843          */
 844         status = ieee80211_register_hw(rt2x00dev->hw);
 845         if (status)
 846                 return status;
 847
 848         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 849
 850         return 0;
 851 }
 852
 853 /*
 854  * Initialization/uninitialization handlers.
 855  */
 856 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 857 {
 858         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 859                 return;
 860
 861         /*
 862          * Unregister extra components.
 863          */
 864         rt2x00rfkill_unregister(rt2x00dev);
 865
 866         /*
 867          * Allow the HW to uninitialize.
 868          */
 869         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 870
 871         /*
 872          * Free allocated queue entries.
 873          */
 874         rt2x00queue_uninitialize(rt2x00dev);
 875 }
 876
 877 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 878 {
 879         int status;
 880
 881         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 882                 return 0;
 883
 884         /*
 885          * Allocate all queue entries.
 886          */
 887         status = rt2x00queue_initialize(rt2x00dev);
 888         if (status)
 889                 return status;
 890
 891         /*
 892          * Initialize the device.
 893          */
 894         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 895         if (status) {
 896                 rt2x00queue_uninitialize(rt2x00dev);
 897                 return status;
 898         }
 899
 900         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
 901
 902         /*
 903          * Register the extra components.
 904          */
 905         rt2x00rfkill_register(rt2x00dev);
 906
 907         return 0;
 908 }
 909
 910 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 911 {
 912         int retval;
 913
 914         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 915                 return 0;
 916
 917         /*
 918          * If this is the first interface which is added,
 919          * we should load the firmware now.
 920          */
 921         retval = rt2x00lib_load_firmware(rt2x00dev);
 922         if (retval)
 923                 return retval;
 924
 925         /*
 926          * Initialize the device.
 927          */
 928         retval = rt2x00lib_initialize(rt2x00dev);
 929         if (retval)
 930                 return retval;
 931
 932         rt2x00dev->intf_ap_count = 0;
 933         rt2x00dev->intf_sta_count = 0;
 934         rt2x00dev->intf_associated = 0;
 935
 936         /* Enable the radio */
 937         retval = rt2x00lib_enable_radio(rt2x00dev);
 938         if (retval)
 939                 return retval;
 940
 941         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
 942
 943         return 0;
 944 }
 945
 946 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
 947 {
 948         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 949                 return;
 950
 951         /*
 952          * Perhaps we can add something smarter here,
 953          * but for now just disabling the radio should do.
 954          */
 955         rt2x00lib_disable_radio(rt2x00dev);
 956
 957         rt2x00dev->intf_ap_count = 0;
 958         rt2x00dev->intf_sta_count = 0;
 959         rt2x00dev->intf_associated = 0;
 960 }
 961
 962 /*
 963  * driver allocation handlers.
 964  */
 965 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 966 {
 967         int retval = -ENOMEM;
 968
 969         mutex_init(&rt2x00dev->csr_mutex);
 970
 971         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 972
 973         /*
 974          * Make room for rt2x00_intf inside the per-interface
 975          * structure ieee80211_vif.
 976          */
 977         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
 978
 979         /*
 980          * Determine which operating modes are supported, all modes
 981          * which require beaconing, depend on the availability of
 982          * beacon entries.
 983          */
 984         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
 985         if (rt2x00dev->ops->bcn->entry_num > 0)
 986                 rt2x00dev->hw->wiphy->interface_modes |=
 987                     BIT(NL80211_IFTYPE_ADHOC) |
 988                     BIT(NL80211_IFTYPE_AP) |
 989                     BIT(NL80211_IFTYPE_MESH_POINT) |
 990                     BIT(NL80211_IFTYPE_WDS);
 991
 992         /*
 993          * Initialize configuration work.
 994          */
 995         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
 996
 997         /*
 998          * Let the driver probe the device to detect the capabilities.
 999          */
1000         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1001         if (retval) {
1002                 ERROR(rt2x00dev, "Failed to allocate device.\n");
1003                 goto exit;
1004         }
1005
1006         /*
1007          * Allocate queue array.
1008          */
1009         retval = rt2x00queue_allocate(rt2x00dev);
1010         if (retval)
1011                 goto exit;
1012
1013         /*
1014          * Initialize ieee80211 structure.
1015          */
1016         retval = rt2x00lib_probe_hw(rt2x00dev);
1017         if (retval) {
1018                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1019                 goto exit;
1020         }
1021
1022         /*
1023          * Register extra components.
1024          */
1025         rt2x00link_register(rt2x00dev);
1026         rt2x00leds_register(rt2x00dev);
1027         rt2x00debug_register(rt2x00dev);
1028
1029         return 0;
1030
1031 exit:
1032         rt2x00lib_remove_dev(rt2x00dev);
1033
1034         return retval;
1035 }
1036 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1037
1038 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1039 {
1040         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1041
1042         /*
1043          * Disable radio.
1044          */
1045         rt2x00lib_disable_radio(rt2x00dev);
1046
1047         /*
1048          * Stop all work.
1049          */
1050         cancel_work_sync(&rt2x00dev->intf_work);
1051         cancel_work_sync(&rt2x00dev->rxdone_work);
1052         cancel_work_sync(&rt2x00dev->txdone_work);
1053
1054         /*
1055          * Free the tx status fifo.
1056          */
1057         kfifo_free(&rt2x00dev->txstatus_fifo);
1058
1059         /*
1060          * Kill the tx status tasklet.
1061          */
1062         tasklet_kill(&rt2x00dev->txstatus_tasklet);
1063
1064         /*
1065          * Uninitialize device.
1066          */
1067         rt2x00lib_uninitialize(rt2x00dev);
1068
1069         /*
1070          * Free extra components
1071          */
1072         rt2x00debug_deregister(rt2x00dev);
1073         rt2x00leds_unregister(rt2x00dev);
1074
1075         /*
1076          * Free ieee80211_hw memory.
1077          */
1078         rt2x00lib_remove_hw(rt2x00dev);
1079
1080         /*
1081          * Free firmware image.
1082          */
1083         rt2x00lib_free_firmware(rt2x00dev);
1084
1085         /*
1086          * Free queue structures.
1087          */
1088         rt2x00queue_free(rt2x00dev);
1089 }
1090 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1091
1092 /*
1093  * Device state handlers
1094  */
1095 #ifdef CONFIG_PM
1096 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1097 {
1098         NOTICE(rt2x00dev, "Going to sleep.\n");
1099
1100         /*
1101          * Prevent mac80211 from accessing driver while suspended.
1102          */
1103         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1104                 return 0;
1105
1106         /*
1107          * Cleanup as much as possible.
1108          */
1109         rt2x00lib_uninitialize(rt2x00dev);
1110
1111         /*
1112          * Suspend/disable extra components.
1113          */
1114         rt2x00leds_suspend(rt2x00dev);
1115         rt2x00debug_deregister(rt2x00dev);
1116
1117         /*
1118          * Set device mode to sleep for power management,
1119          * on some hardware this call seems to consistently fail.
1120          * From the specifications it is hard to tell why it fails,
1121          * and if this is a "bad thing".
1122          * Overall it is safe to just ignore the failure and
1123          * continue suspending. The only downside is that the
1124          * device will not be in optimal power save mode, but with
1125          * the radio and the other components already disabled the
1126          * device is as good as disabled.
1127          */
1128         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1129                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1130                         "continue suspending.\n");
1131
1132         return 0;
1133 }
1134 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1135
1136 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1137 {
1138         NOTICE(rt2x00dev, "Waking up.\n");
1139
1140         /*
1141          * Restore/enable extra components.
1142          */
1143         rt2x00debug_register(rt2x00dev);
1144         rt2x00leds_resume(rt2x00dev);
1145
1146         /*
1147          * We are ready again to receive requests from mac80211.
1148          */
1149         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1150
1151         return 0;
1152 }
1153 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1154 #endif /* CONFIG_PM */
1155
1156 /*
1157  * rt2x00lib module information.
1158  */
1159 MODULE_AUTHOR(DRV_PROJECT);
1160 MODULE_VERSION(DRV_VERSION);
1161 MODULE_DESCRIPTION("rt2x00 library");
1162 MODULE_LICENSE("GPL");