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_txdone(struct queue_entry *entry,
 255                       struct txdone_entry_desc *txdesc)
 256 {
 257         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 258         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 259         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 260         enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
 261         unsigned int header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 262         u8 rate_idx, rate_flags, retry_rates;
 263         u8 skbdesc_flags = skbdesc->flags;
 264         unsigned int i;
 265         bool success;
 266
 267         /*
 268          * Unmap the skb.
 269          */
 270         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 271
 272         /*
 273          * Remove the extra tx headroom from the skb.
 274          */
 275         skb_pull(entry->skb, rt2x00dev->ops->extra_tx_headroom);
 276
 277         /*
 278          * Signal that the TX descriptor is no longer in the skb.
 279          */
 280         skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
 281
 282         /*
 283          * Remove L2 padding which was added during
 284          */
 285         if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
 286                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 287
 288         /*
 289          * If the IV/EIV data was stripped from the frame before it was
 290          * passed to the hardware, we should now reinsert it again because
 291          * mac80211 will expect the same data to be present it the
 292          * frame as it was passed to us.
 293          */
 294         if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
 295                 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
 296
 297         /*
 298          * Send frame to debugfs immediately, after this call is completed
 299          * we are going to overwrite the skb->cb array.
 300          */
 301         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 302
 303         /*
 304          * Determine if the frame has been successfully transmitted.
 305          */
 306         success =
 307             test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 308             test_bit(TXDONE_UNKNOWN, &txdesc->flags);
 309
 310         /*
 311          * Update TX statistics.
 312          */
 313         rt2x00dev->link.qual.tx_success += success;
 314         rt2x00dev->link.qual.tx_failed += !success;
 315
 316         rate_idx = skbdesc->tx_rate_idx;
 317         rate_flags = skbdesc->tx_rate_flags;
 318         retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
 319             (txdesc->retry + 1) : 1;
 320
 321         /*
 322          * Initialize TX status
 323          */
 324         memset(&tx_info->status, 0, sizeof(tx_info->status));
 325         tx_info->status.ack_signal = 0;
 326
 327         /*
 328          * Frame was send with retries, hardware tried
 329          * different rates to send out the frame, at each
 330          * retry it lowered the rate 1 step except when the
 331          * lowest rate was used.
 332          */
 333         for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
 334                 tx_info->status.rates[i].idx = rate_idx - i;
 335                 tx_info->status.rates[i].flags = rate_flags;
 336
 337                 if (rate_idx - i == 0) {
 338                         /*
 339                          * The lowest rate (index 0) was used until the
 340                          * number of max retries was reached.
 341                          */
 342                         tx_info->status.rates[i].count = retry_rates - i;
 343                         i++;
 344                         break;
 345                 }
 346                 tx_info->status.rates[i].count = 1;
 347         }
 348         if (i < (IEEE80211_TX_MAX_RATES - 1))
 349                 tx_info->status.rates[i].idx = -1; /* terminate */
 350
 351         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 352                 if (success)
 353                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 354                 else
 355                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 356         }
 357
 358         /*
 359          * Every single frame has it's own tx status, hence report
 360          * every frame as ampdu of size 1.
 361          *
 362          * TODO: if we can find out how many frames were aggregated
 363          * by the hw we could provide the real ampdu_len to mac80211
 364          * which would allow the rc algorithm to better decide on
 365          * which rates are suitable.
 366          */
 367         if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 368                 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
 369                 tx_info->status.ampdu_len = 1;
 370                 tx_info->status.ampdu_ack_len = success ? 1 : 0;
 371         }
 372
 373         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 374                 if (success)
 375                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 376                 else
 377                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 378         }
 379
 380         /*
 381          * Only send the status report to mac80211 when it's a frame
 382          * that originated in mac80211. If this was a extra frame coming
 383          * through a mac80211 library call (RTS/CTS) then we should not
 384          * send the status report back.
 385          */
 386         if (!(skbdesc_flags & SKBDESC_NOT_MAC80211))
 387                 ieee80211_tx_status(rt2x00dev->hw, entry->skb);
 388         else
 389                 dev_kfree_skb_any(entry->skb);
 390
 391         /*
 392          * Make this entry available for reuse.
 393          */
 394         entry->skb = NULL;
 395         entry->flags = 0;
 396
 397         rt2x00dev->ops->lib->clear_entry(entry);
 398
 399         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 400
 401         /*
 402          * If the data queue was below the threshold before the txdone
 403          * handler we must make sure the packet queue in the mac80211 stack
 404          * is reenabled when the txdone handler has finished.
 405          */
 406         if (!rt2x00queue_threshold(entry->queue))
 407                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 408 }
 409 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 410
 411 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
 412 {
 413         struct txdone_entry_desc txdesc;
 414
 415         txdesc.flags = 0;
 416         __set_bit(status, &txdesc.flags);
 417         txdesc.retry = 0;
 418
 419         rt2x00lib_txdone(entry, &txdesc);
 420 }
 421 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
 422
 423 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 424                                         struct rxdone_entry_desc *rxdesc)
 425 {
 426         struct ieee80211_supported_band *sband;
 427         const struct rt2x00_rate *rate;
 428         unsigned int i;
 429         int signal;
 430         int type;
 431
 432         /*
 433          * For non-HT rates the MCS value needs to contain the
 434          * actually used rate modulation (CCK or OFDM).
 435          */
 436         if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 437                 signal = RATE_MCS(rxdesc->rate_mode, rxdesc->signal);
 438         else
 439                 signal = rxdesc->signal;
 440
 441         type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 442
 443         sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 444         for (i = 0; i < sband->n_bitrates; i++) {
 445                 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 446
 447                 if (((type == RXDONE_SIGNAL_PLCP) &&
 448                      (rate->plcp == signal)) ||
 449                     ((type == RXDONE_SIGNAL_BITRATE) &&
 450                       (rate->bitrate == signal)) ||
 451                     ((type == RXDONE_SIGNAL_MCS) &&
 452                       (rate->mcs == signal))) {
 453                         return i;
 454                 }
 455         }
 456
 457         WARNING(rt2x00dev, "Frame received with unrecognized signal, "
 458                 "signal=0x%.4x, type=%d.\n", signal, type);
 459         return 0;
 460 }
 461
 462 void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
 463                       struct queue_entry *entry)
 464 {
 465         struct rxdone_entry_desc rxdesc;
 466         struct sk_buff *skb;
 467         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 468         unsigned int header_length;
 469         int rate_idx;
 470
 471         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
 472                 goto submit_entry;
 473
 474         /*
 475          * Allocate a new sk_buffer. If no new buffer available, drop the
 476          * received frame and reuse the existing buffer.
 477          */
 478         skb = rt2x00queue_alloc_rxskb(rt2x00dev, entry);
 479         if (!skb)
 480                 return;
 481
 482         /*
 483          * Unmap the skb.
 484          */
 485         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 486
 487         /*
 488          * Extract the RXD details.
 489          */
 490         memset(&rxdesc, 0, sizeof(rxdesc));
 491         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 492
 493         /*
 494          * The data behind the ieee80211 header must be
 495          * aligned on a 4 byte boundary.
 496          */
 497         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 498
 499         /*
 500          * Hardware might have stripped the IV/EIV/ICV data,
 501          * in that case it is possible that the data was
 502          * provided separately (through hardware descriptor)
 503          * in which case we should reinsert the data into the frame.
 504          */
 505         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 506             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 507                 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
 508                                           &rxdesc);
 509         else if (header_length &&
 510                  (rxdesc.size > header_length) &&
 511                  (rxdesc.dev_flags & RXDONE_L2PAD))
 512                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 513         else
 514                 rt2x00queue_align_payload(entry->skb, header_length);
 515
 516         /* Trim buffer to correct size */
 517         skb_trim(entry->skb, rxdesc.size);
 518
 519         /*
 520          * Check if the frame was received using HT. In that case,
 521          * the rate is the MCS index and should be passed to mac80211
 522          * directly. Otherwise we need to translate the signal to
 523          * the correct bitrate index.
 524          */
 525         if (rxdesc.rate_mode == RATE_MODE_CCK ||
 526             rxdesc.rate_mode == RATE_MODE_OFDM) {
 527                 rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 528         } else {
 529                 rxdesc.flags |= RX_FLAG_HT;
 530                 rate_idx = rxdesc.signal;
 531         }
 532
 533         /*
 534          * Update extra components
 535          */
 536         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 537         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 538
 539         rx_status->mactime = rxdesc.timestamp;
 540         rx_status->rate_idx = rate_idx;
 541         rx_status->signal = rxdesc.rssi;
 542         rx_status->flag = rxdesc.flags;
 543         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 544
 545         /*
 546          * Send frame to mac80211 & debugfs.
 547          * mac80211 will clean up the skb structure.
 548          */
 549         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 550         memcpy(IEEE80211_SKB_RXCB(entry->skb), rx_status, sizeof(*rx_status));
 551         ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
 552
 553         /*
 554          * Replace the skb with the freshly allocated one.
 555          */
 556         entry->skb = skb;
 557
 558 submit_entry:
 559         rt2x00dev->ops->lib->clear_entry(entry);
 560         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 561         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 562 }
 563 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 564
 565 /*
 566  * Driver initialization handlers.
 567  */
 568 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 569         {
 570                 .flags = DEV_RATE_CCK,
 571                 .bitrate = 10,
 572                 .ratemask = BIT(0),
 573                 .plcp = 0x00,
 574                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 575         },
 576         {
 577                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 578                 .bitrate = 20,
 579                 .ratemask = BIT(1),
 580                 .plcp = 0x01,
 581                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 582         },
 583         {
 584                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 585                 .bitrate = 55,
 586                 .ratemask = BIT(2),
 587                 .plcp = 0x02,
 588                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 589         },
 590         {
 591                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 592                 .bitrate = 110,
 593                 .ratemask = BIT(3),
 594                 .plcp = 0x03,
 595                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 596         },
 597         {
 598                 .flags = DEV_RATE_OFDM,
 599                 .bitrate = 60,
 600                 .ratemask = BIT(4),
 601                 .plcp = 0x0b,
 602                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 603         },
 604         {
 605                 .flags = DEV_RATE_OFDM,
 606                 .bitrate = 90,
 607                 .ratemask = BIT(5),
 608                 .plcp = 0x0f,
 609                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 610         },
 611         {
 612                 .flags = DEV_RATE_OFDM,
 613                 .bitrate = 120,
 614                 .ratemask = BIT(6),
 615                 .plcp = 0x0a,
 616                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 617         },
 618         {
 619                 .flags = DEV_RATE_OFDM,
 620                 .bitrate = 180,
 621                 .ratemask = BIT(7),
 622                 .plcp = 0x0e,
 623                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 624         },
 625         {
 626                 .flags = DEV_RATE_OFDM,
 627                 .bitrate = 240,
 628                 .ratemask = BIT(8),
 629                 .plcp = 0x09,
 630                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 631         },
 632         {
 633                 .flags = DEV_RATE_OFDM,
 634                 .bitrate = 360,
 635                 .ratemask = BIT(9),
 636                 .plcp = 0x0d,
 637                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 638         },
 639         {
 640                 .flags = DEV_RATE_OFDM,
 641                 .bitrate = 480,
 642                 .ratemask = BIT(10),
 643                 .plcp = 0x08,
 644                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 645         },
 646         {
 647                 .flags = DEV_RATE_OFDM,
 648                 .bitrate = 540,
 649                 .ratemask = BIT(11),
 650                 .plcp = 0x0c,
 651                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 652         },
 653 };
 654
 655 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 656                               const int channel, const int tx_power,
 657                               const int value)
 658 {
 659         entry->center_freq = ieee80211_channel_to_frequency(channel);
 660         entry->hw_value = value;
 661         entry->max_power = tx_power;
 662         entry->max_antenna_gain = 0xff;
 663 }
 664
 665 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 666                            const u16 index, const struct rt2x00_rate *rate)
 667 {
 668         entry->flags = 0;
 669         entry->bitrate = rate->bitrate;
 670         entry->hw_value =index;
 671         entry->hw_value_short = index;
 672
 673         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 674                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 675 }
 676
 677 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 678                                     struct hw_mode_spec *spec)
 679 {
 680         struct ieee80211_hw *hw = rt2x00dev->hw;
 681         struct ieee80211_channel *channels;
 682         struct ieee80211_rate *rates;
 683         unsigned int num_rates;
 684         unsigned int i;
 685
 686         num_rates = 0;
 687         if (spec->supported_rates & SUPPORT_RATE_CCK)
 688                 num_rates += 4;
 689         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 690                 num_rates += 8;
 691
 692         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 693         if (!channels)
 694                 return -ENOMEM;
 695
 696         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 697         if (!rates)
 698                 goto exit_free_channels;
 699
 700         /*
 701          * Initialize Rate list.
 702          */
 703         for (i = 0; i < num_rates; i++)
 704                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 705
 706         /*
 707          * Initialize Channel list.
 708          */
 709         for (i = 0; i < spec->num_channels; i++) {
 710                 rt2x00lib_channel(&channels[i],
 711                                   spec->channels[i].channel,
 712                                   spec->channels_info[i].tx_power1, i);
 713         }
 714
 715         /*
 716          * Intitialize 802.11b, 802.11g
 717          * Rates: CCK, OFDM.
 718          * Channels: 2.4 GHz
 719          */
 720         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 721                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 722                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 723                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 724                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 725                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 726                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 727                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
 728                        &spec->ht, sizeof(spec->ht));
 729         }
 730
 731         /*
 732          * Intitialize 802.11a
 733          * Rates: OFDM.
 734          * Channels: OFDM, UNII, HiperLAN2.
 735          */
 736         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 737                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 738                     spec->num_channels - 14;
 739                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 740                     num_rates - 4;
 741                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 742                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 743                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 744                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 745                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
 746                        &spec->ht, sizeof(spec->ht));
 747         }
 748
 749         return 0;
 750
 751  exit_free_channels:
 752         kfree(channels);
 753         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 754         return -ENOMEM;
 755 }
 756
 757 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 758 {
 759         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 760                 ieee80211_unregister_hw(rt2x00dev->hw);
 761
 762         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 763                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 764                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 765                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 766                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 767         }
 768
 769         kfree(rt2x00dev->spec.channels_info);
 770 }
 771
 772 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 773 {
 774         struct hw_mode_spec *spec = &rt2x00dev->spec;
 775         int status;
 776
 777         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 778                 return 0;
 779
 780         /*
 781          * Initialize HW modes.
 782          */
 783         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 784         if (status)
 785                 return status;
 786
 787         /*
 788          * Initialize HW fields.
 789          */
 790         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 791
 792         /*
 793          * Initialize extra TX headroom required.
 794          */
 795         rt2x00dev->hw->extra_tx_headroom =
 796                 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
 797                       rt2x00dev->ops->extra_tx_headroom);
 798
 799         /*
 800          * Take TX headroom required for alignment into account.
 801          */
 802         if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
 803                 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
 804         else if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags))
 805                 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
 806
 807         /*
 808          * Register HW.
 809          */
 810         status = ieee80211_register_hw(rt2x00dev->hw);
 811         if (status)
 812                 return status;
 813
 814         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 815
 816         return 0;
 817 }
 818
 819 /*
 820  * Initialization/uninitialization handlers.
 821  */
 822 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 823 {
 824         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 825                 return;
 826
 827         /*
 828          * Unregister extra components.
 829          */
 830         rt2x00rfkill_unregister(rt2x00dev);
 831
 832         /*
 833          * Allow the HW to uninitialize.
 834          */
 835         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 836
 837         /*
 838          * Free allocated queue entries.
 839          */
 840         rt2x00queue_uninitialize(rt2x00dev);
 841 }
 842
 843 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 844 {
 845         int status;
 846
 847         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 848                 return 0;
 849
 850         /*
 851          * Allocate all queue entries.
 852          */
 853         status = rt2x00queue_initialize(rt2x00dev);
 854         if (status)
 855                 return status;
 856
 857         /*
 858          * Initialize the device.
 859          */
 860         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 861         if (status) {
 862                 rt2x00queue_uninitialize(rt2x00dev);
 863                 return status;
 864         }
 865
 866         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
 867
 868         /*
 869          * Register the extra components.
 870          */
 871         rt2x00rfkill_register(rt2x00dev);
 872
 873         return 0;
 874 }
 875
 876 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 877 {
 878         int retval;
 879
 880         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 881                 return 0;
 882
 883         /*
 884          * If this is the first interface which is added,
 885          * we should load the firmware now.
 886          */
 887         retval = rt2x00lib_load_firmware(rt2x00dev);
 888         if (retval)
 889                 return retval;
 890
 891         /*
 892          * Initialize the device.
 893          */
 894         retval = rt2x00lib_initialize(rt2x00dev);
 895         if (retval)
 896                 return retval;
 897
 898         rt2x00dev->intf_ap_count = 0;
 899         rt2x00dev->intf_sta_count = 0;
 900         rt2x00dev->intf_associated = 0;
 901
 902         /* Enable the radio */
 903         retval = rt2x00lib_enable_radio(rt2x00dev);
 904         if (retval) {
 905                 rt2x00queue_uninitialize(rt2x00dev);
 906                 return retval;
 907         }
 908
 909         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
 910
 911         return 0;
 912 }
 913
 914 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
 915 {
 916         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 917                 return;
 918
 919         /*
 920          * Perhaps we can add something smarter here,
 921          * but for now just disabling the radio should do.
 922          */
 923         rt2x00lib_disable_radio(rt2x00dev);
 924
 925         rt2x00dev->intf_ap_count = 0;
 926         rt2x00dev->intf_sta_count = 0;
 927         rt2x00dev->intf_associated = 0;
 928 }
 929
 930 /*
 931  * driver allocation handlers.
 932  */
 933 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 934 {
 935         int retval = -ENOMEM;
 936
 937         mutex_init(&rt2x00dev->csr_mutex);
 938
 939         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 940
 941         /*
 942          * Make room for rt2x00_intf inside the per-interface
 943          * structure ieee80211_vif.
 944          */
 945         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
 946
 947         /*
 948          * Determine which operating modes are supported, all modes
 949          * which require beaconing, depend on the availability of
 950          * beacon entries.
 951          */
 952         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
 953         if (rt2x00dev->ops->bcn->entry_num > 0)
 954                 rt2x00dev->hw->wiphy->interface_modes |=
 955                     BIT(NL80211_IFTYPE_ADHOC) |
 956                     BIT(NL80211_IFTYPE_AP) |
 957                     BIT(NL80211_IFTYPE_MESH_POINT) |
 958                     BIT(NL80211_IFTYPE_WDS);
 959
 960         /*
 961          * Initialize configuration work.
 962          */
 963         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
 964
 965         /*
 966          * Let the driver probe the device to detect the capabilities.
 967          */
 968         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
 969         if (retval) {
 970                 ERROR(rt2x00dev, "Failed to allocate device.\n");
 971                 goto exit;
 972         }
 973
 974         /*
 975          * Allocate queue array.
 976          */
 977         retval = rt2x00queue_allocate(rt2x00dev);
 978         if (retval)
 979                 goto exit;
 980
 981         /*
 982          * Initialize ieee80211 structure.
 983          */
 984         retval = rt2x00lib_probe_hw(rt2x00dev);
 985         if (retval) {
 986                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
 987                 goto exit;
 988         }
 989
 990         /*
 991          * Register extra components.
 992          */
 993         rt2x00link_register(rt2x00dev);
 994         rt2x00leds_register(rt2x00dev);
 995         rt2x00debug_register(rt2x00dev);
 996
 997         return 0;
 998
 999 exit:
1000         rt2x00lib_remove_dev(rt2x00dev);
1001
1002         return retval;
1003 }
1004 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1005
1006 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1007 {
1008         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1009
1010         /*
1011          * Disable radio.
1012          */
1013         rt2x00lib_disable_radio(rt2x00dev);
1014
1015         /*
1016          * Stop all work.
1017          */
1018         cancel_work_sync(&rt2x00dev->intf_work);
1019         cancel_work_sync(&rt2x00dev->rxdone_work);
1020         cancel_work_sync(&rt2x00dev->txdone_work);
1021
1022         /*
1023          * Uninitialize device.
1024          */
1025         rt2x00lib_uninitialize(rt2x00dev);
1026
1027         /*
1028          * Free extra components
1029          */
1030         rt2x00debug_deregister(rt2x00dev);
1031         rt2x00leds_unregister(rt2x00dev);
1032
1033         /*
1034          * Free ieee80211_hw memory.
1035          */
1036         rt2x00lib_remove_hw(rt2x00dev);
1037
1038         /*
1039          * Free firmware image.
1040          */
1041         rt2x00lib_free_firmware(rt2x00dev);
1042
1043         /*
1044          * Free queue structures.
1045          */
1046         rt2x00queue_free(rt2x00dev);
1047 }
1048 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1049
1050 /*
1051  * Device state handlers
1052  */
1053 #ifdef CONFIG_PM
1054 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1055 {
1056         NOTICE(rt2x00dev, "Going to sleep.\n");
1057
1058         /*
1059          * Prevent mac80211 from accessing driver while suspended.
1060          */
1061         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1062                 return 0;
1063
1064         /*
1065          * Cleanup as much as possible.
1066          */
1067         rt2x00lib_uninitialize(rt2x00dev);
1068
1069         /*
1070          * Suspend/disable extra components.
1071          */
1072         rt2x00leds_suspend(rt2x00dev);
1073         rt2x00debug_deregister(rt2x00dev);
1074
1075         /*
1076          * Set device mode to sleep for power management,
1077          * on some hardware this call seems to consistently fail.
1078          * From the specifications it is hard to tell why it fails,
1079          * and if this is a "bad thing".
1080          * Overall it is safe to just ignore the failure and
1081          * continue suspending. The only downside is that the
1082          * device will not be in optimal power save mode, but with
1083          * the radio and the other components already disabled the
1084          * device is as good as disabled.
1085          */
1086         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1087                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1088                         "continue suspending.\n");
1089
1090         return 0;
1091 }
1092 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1093
1094 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1095 {
1096         NOTICE(rt2x00dev, "Waking up.\n");
1097
1098         /*
1099          * Restore/enable extra components.
1100          */
1101         rt2x00debug_register(rt2x00dev);
1102         rt2x00leds_resume(rt2x00dev);
1103
1104         /*
1105          * We are ready again to receive requests from mac80211.
1106          */
1107         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1108
1109         return 0;
1110 }
1111 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1112 #endif /* CONFIG_PM */
1113
1114 /*
1115  * rt2x00lib module information.
1116  */
1117 MODULE_AUTHOR(DRV_PROJECT);
1118 MODULE_VERSION(DRV_VERSION);
1119 MODULE_DESCRIPTION("rt2x00 library");
1120 MODULE_LICENSE("GPL");