drivers/net/wireless/rt2x00/rt2x00dev.c

   1 /*
   2         Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00lib
  23         Abstract: rt2x00 generic device routines.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/slab.h>
  29
  30 #include "rt2x00.h"
  31 #include "rt2x00lib.h"
  32
  33 /*
  34  * Radio control handlers.
  35  */
  36 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  37 {
  38         int status;
  39
  40         /*
  41          * Don't enable the radio twice.
  42          * And check if the hardware button has been disabled.
  43          */
  44         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  45                 return 0;
  46
  47         /*
  48          * Initialize all data queues.
  49          */
  50         rt2x00queue_init_queues(rt2x00dev);
  51
  52         /*
  53          * Enable radio.
  54          */
  55         status =
  56             rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
  57         if (status)
  58                 return status;
  59
  60         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
  61
  62         rt2x00leds_led_radio(rt2x00dev, true);
  63         rt2x00led_led_activity(rt2x00dev, true);
  64
  65         set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
  66
  67         /*
  68          * Enable RX.
  69          */
  70         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
  71
  72         /*
  73          * Start watchdog monitoring.
  74          */
  75         rt2x00link_start_watchdog(rt2x00dev);
  76
  77         /*
  78          * Start the TX queues.
  79          */
  80         ieee80211_wake_queues(rt2x00dev->hw);
  81
  82         return 0;
  83 }
  84
  85 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
  86 {
  87         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  88                 return;
  89
  90         /*
  91          * Stop the TX queues in mac80211.
  92          */
  93         ieee80211_stop_queues(rt2x00dev->hw);
  94         rt2x00queue_stop_queues(rt2x00dev);
  95
  96         /*
  97          * Stop watchdog monitoring.
  98          */
  99         rt2x00link_stop_watchdog(rt2x00dev);
 100
 101         /*
 102          * Disable RX.
 103          */
 104         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 105
 106         /*
 107          * Disable radio.
 108          */
 109         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 110         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 111         rt2x00led_led_activity(rt2x00dev, false);
 112         rt2x00leds_led_radio(rt2x00dev, false);
 113 }
 114
 115 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 116 {
 117         /*
 118          * When we are disabling the RX, we should also stop the link tuner.
 119          */
 120         if (state == STATE_RADIO_RX_OFF)
 121                 rt2x00link_stop_tuner(rt2x00dev);
 122
 123         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 124
 125         /*
 126          * When we are enabling the RX, we should also start the link tuner.
 127          */
 128         if (state == STATE_RADIO_RX_ON)
 129                 rt2x00link_start_tuner(rt2x00dev);
 130 }
 131
 132 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 133                                           struct ieee80211_vif *vif)
 134 {
 135         struct rt2x00_dev *rt2x00dev = data;
 136         struct rt2x00_intf *intf = vif_to_intf(vif);
 137         int delayed_flags;
 138
 139         /*
 140          * Copy all data we need during this action under the protection
 141          * of a spinlock. Otherwise race conditions might occur which results
 142          * into an invalid configuration.
 143          */
 144         spin_lock(&intf->lock);
 145
 146         delayed_flags = intf->delayed_flags;
 147         intf->delayed_flags = 0;
 148
 149         spin_unlock(&intf->lock);
 150
 151         /*
 152          * It is possible the radio was disabled while the work had been
 153          * scheduled. If that happens we should return here immediately,
 154          * note that in the spinlock protected area above the delayed_flags
 155          * have been cleared correctly.
 156          */
 157         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 158                 return;
 159
 160         if (delayed_flags & DELAYED_UPDATE_BEACON)
 161                 rt2x00queue_update_beacon(rt2x00dev, vif, true);
 162 }
 163
 164 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 165 {
 166         struct rt2x00_dev *rt2x00dev =
 167             container_of(work, struct rt2x00_dev, intf_work);
 168
 169         /*
 170          * Iterate over each interface and perform the
 171          * requested configurations.
 172          */
 173         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 174                                             rt2x00lib_intf_scheduled_iter,
 175                                             rt2x00dev);
 176 }
 177
 178 /*
 179  * Interrupt context handlers.
 180  */
 181 static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac,
 182                                      struct ieee80211_vif *vif)
 183 {
 184         struct rt2x00_dev *rt2x00dev = data;
 185         struct sk_buff *skb;
 186
 187         /*
 188          * Only AP mode interfaces do broad- and multicast buffering
 189          */
 190         if (vif->type != NL80211_IFTYPE_AP)
 191                 return;
 192
 193         /*
 194          * Send out buffered broad- and multicast frames
 195          */
 196         skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 197         while (skb) {
 198                 rt2x00mac_tx(rt2x00dev->hw, skb);
 199                 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
 200         }
 201 }
 202
 203 static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac,
 204                                         struct ieee80211_vif *vif)
 205 {
 206         struct rt2x00_dev *rt2x00dev = data;
 207
 208         if (vif->type != NL80211_IFTYPE_AP &&
 209             vif->type != NL80211_IFTYPE_ADHOC &&
 210             vif->type != NL80211_IFTYPE_MESH_POINT &&
 211             vif->type != NL80211_IFTYPE_WDS)
 212                 return;
 213
 214         rt2x00queue_update_beacon(rt2x00dev, vif, true);
 215 }
 216
 217 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 218 {
 219         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 220                 return;
 221
 222         /* send buffered bc/mc frames out for every bssid */
 223         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 224                                             rt2x00lib_bc_buffer_iter,
 225                                             rt2x00dev);
 226         /*
 227          * Devices with pre tbtt interrupt don't need to update the beacon
 228          * here as they will fetch the next beacon directly prior to
 229          * transmission.
 230          */
 231         if (test_bit(DRIVER_SUPPORT_PRE_TBTT_INTERRUPT, &rt2x00dev->flags))
 232                 return;
 233
 234         /* fetch next beacon */
 235         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 236                                             rt2x00lib_beaconupdate_iter,
 237                                             rt2x00dev);
 238 }
 239 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 240
 241 void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev)
 242 {
 243         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 244                 return;
 245
 246         /* fetch next beacon */
 247         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 248                                             rt2x00lib_beaconupdate_iter,
 249                                             rt2x00dev);
 250 }
 251 EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
 252
 253 void rt2x00lib_txdone(struct queue_entry *entry,
 254                       struct txdone_entry_desc *txdesc)
 255 {
 256         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 257         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 258         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 259         enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
 260         unsigned int header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 261         u8 rate_idx, rate_flags, retry_rates;
 262         u8 skbdesc_flags = skbdesc->flags;
 263         unsigned int i;
 264         bool success;
 265
 266         /*
 267          * Unmap the skb.
 268          */
 269         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 270
 271         /*
 272          * Remove the extra tx headroom from the skb.
 273          */
 274         skb_pull(entry->skb, rt2x00dev->ops->extra_tx_headroom);
 275
 276         /*
 277          * Signal that the TX descriptor is no longer in the skb.
 278          */
 279         skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
 280
 281         /*
 282          * Remove L2 padding which was added during
 283          */
 284         if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
 285                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 286
 287         /*
 288          * If the IV/EIV data was stripped from the frame before it was
 289          * passed to the hardware, we should now reinsert it again because
 290          * mac80211 will expect the same data to be present it the
 291          * frame as it was passed to us.
 292          */
 293         if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
 294                 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
 295
 296         /*
 297          * Send frame to debugfs immediately, after this call is completed
 298          * we are going to overwrite the skb->cb array.
 299          */
 300         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 301
 302         /*
 303          * Determine if the frame has been successfully transmitted.
 304          */
 305         success =
 306             test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 307             test_bit(TXDONE_UNKNOWN, &txdesc->flags);
 308
 309         /*
 310          * Update TX statistics.
 311          */
 312         rt2x00dev->link.qual.tx_success += success;
 313         rt2x00dev->link.qual.tx_failed += !success;
 314
 315         rate_idx = skbdesc->tx_rate_idx;
 316         rate_flags = skbdesc->tx_rate_flags;
 317         retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
 318             (txdesc->retry + 1) : 1;
 319
 320         /*
 321          * Initialize TX status
 322          */
 323         memset(&tx_info->status, 0, sizeof(tx_info->status));
 324         tx_info->status.ack_signal = 0;
 325
 326         /*
 327          * Frame was send with retries, hardware tried
 328          * different rates to send out the frame, at each
 329          * retry it lowered the rate 1 step except when the
 330          * lowest rate was used.
 331          */
 332         for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
 333                 tx_info->status.rates[i].idx = rate_idx - i;
 334                 tx_info->status.rates[i].flags = rate_flags;
 335
 336                 if (rate_idx - i == 0) {
 337                         /*
 338                          * The lowest rate (index 0) was used until the
 339                          * number of max retries was reached.
 340                          */
 341                         tx_info->status.rates[i].count = retry_rates - i;
 342                         i++;
 343                         break;
 344                 }
 345                 tx_info->status.rates[i].count = 1;
 346         }
 347         if (i < (IEEE80211_TX_MAX_RATES - 1))
 348                 tx_info->status.rates[i].idx = -1; /* terminate */
 349
 350         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 351                 if (success)
 352                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 353                 else
 354                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 355         }
 356
 357         /*
 358          * Every single frame has it's own tx status, hence report
 359          * every frame as ampdu of size 1.
 360          *
 361          * TODO: if we can find out how many frames were aggregated
 362          * by the hw we could provide the real ampdu_len to mac80211
 363          * which would allow the rc algorithm to better decide on
 364          * which rates are suitable.
 365          */
 366         if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 367                 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
 368                 tx_info->status.ampdu_len = 1;
 369                 tx_info->status.ampdu_ack_len = success ? 1 : 0;
 370         }
 371
 372         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 373                 if (success)
 374                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 375                 else
 376                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 377         }
 378
 379         /*
 380          * Only send the status report to mac80211 when it's a frame
 381          * that originated in mac80211. If this was a extra frame coming
 382          * through a mac80211 library call (RTS/CTS) then we should not
 383          * send the status report back.
 384          */
 385         if (!(skbdesc_flags & SKBDESC_NOT_MAC80211))
 386                 /*
 387                  * Only PCI and SOC devices process the tx status in process
 388                  * context. Hence use ieee80211_tx_status for PCI and SOC
 389                  * devices and stick to ieee80211_tx_status_irqsafe for USB.
 390                  */
 391                 if (rt2x00_is_usb(rt2x00dev))
 392                         ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb);
 393                 else
 394                         ieee80211_tx_status(rt2x00dev->hw, entry->skb);
 395         else
 396                 dev_kfree_skb_any(entry->skb);
 397
 398         /*
 399          * Make this entry available for reuse.
 400          */
 401         entry->skb = NULL;
 402         entry->flags = 0;
 403
 404         rt2x00dev->ops->lib->clear_entry(entry);
 405
 406         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 407         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 408
 409         /*
 410          * If the data queue was below the threshold before the txdone
 411          * handler we must make sure the packet queue in the mac80211 stack
 412          * is reenabled when the txdone handler has finished.
 413          */
 414         if (!rt2x00queue_threshold(entry->queue))
 415                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 416 }
 417 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 418
 419 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 420                                         struct rxdone_entry_desc *rxdesc)
 421 {
 422         struct ieee80211_supported_band *sband;
 423         const struct rt2x00_rate *rate;
 424         unsigned int i;
 425         int signal;
 426         int type;
 427
 428         /*
 429          * For non-HT rates the MCS value needs to contain the
 430          * actually used rate modulation (CCK or OFDM).
 431          */
 432         if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 433                 signal = RATE_MCS(rxdesc->rate_mode, rxdesc->signal);
 434         else
 435                 signal = rxdesc->signal;
 436
 437         type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 438
 439         sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 440         for (i = 0; i < sband->n_bitrates; i++) {
 441                 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 442
 443                 if (((type == RXDONE_SIGNAL_PLCP) &&
 444                      (rate->plcp == signal)) ||
 445                     ((type == RXDONE_SIGNAL_BITRATE) &&
 446                       (rate->bitrate == signal)) ||
 447                     ((type == RXDONE_SIGNAL_MCS) &&
 448                       (rate->mcs == signal))) {
 449                         return i;
 450                 }
 451         }
 452
 453         WARNING(rt2x00dev, "Frame received with unrecognized signal, "
 454                 "signal=0x%.4x, type=%d.\n", signal, type);
 455         return 0;
 456 }
 457
 458 void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
 459                       struct queue_entry *entry)
 460 {
 461         struct rxdone_entry_desc rxdesc;
 462         struct sk_buff *skb;
 463         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 464         unsigned int header_length;
 465         int rate_idx;
 466         /*
 467          * Allocate a new sk_buffer. If no new buffer available, drop the
 468          * received frame and reuse the existing buffer.
 469          */
 470         skb = rt2x00queue_alloc_rxskb(rt2x00dev, entry);
 471         if (!skb)
 472                 return;
 473
 474         /*
 475          * Unmap the skb.
 476          */
 477         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 478
 479         /*
 480          * Extract the RXD details.
 481          */
 482         memset(&rxdesc, 0, sizeof(rxdesc));
 483         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 484
 485         /*
 486          * The data behind the ieee80211 header must be
 487          * aligned on a 4 byte boundary.
 488          */
 489         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 490
 491         /*
 492          * Hardware might have stripped the IV/EIV/ICV data,
 493          * in that case it is possible that the data was
 494          * provided separately (through hardware descriptor)
 495          * in which case we should reinsert the data into the frame.
 496          */
 497         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 498             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 499                 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
 500                                           &rxdesc);
 501         else if (header_length &&
 502                  (rxdesc.size > header_length) &&
 503                  (rxdesc.dev_flags & RXDONE_L2PAD))
 504                 rt2x00queue_remove_l2pad(entry->skb, header_length);
 505         else
 506                 rt2x00queue_align_payload(entry->skb, header_length);
 507
 508         /* Trim buffer to correct size */
 509         skb_trim(entry->skb, rxdesc.size);
 510
 511         /*
 512          * Check if the frame was received using HT. In that case,
 513          * the rate is the MCS index and should be passed to mac80211
 514          * directly. Otherwise we need to translate the signal to
 515          * the correct bitrate index.
 516          */
 517         if (rxdesc.rate_mode == RATE_MODE_CCK ||
 518             rxdesc.rate_mode == RATE_MODE_OFDM) {
 519                 rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 520         } else {
 521                 rxdesc.flags |= RX_FLAG_HT;
 522                 rate_idx = rxdesc.signal;
 523         }
 524
 525         /*
 526          * Update extra components
 527          */
 528         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 529         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 530
 531         rx_status->mactime = rxdesc.timestamp;
 532         rx_status->rate_idx = rate_idx;
 533         rx_status->signal = rxdesc.rssi;
 534         rx_status->flag = rxdesc.flags;
 535         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 536
 537         /*
 538          * Send frame to mac80211 & debugfs.
 539          * mac80211 will clean up the skb structure.
 540          */
 541         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 542         memcpy(IEEE80211_SKB_RXCB(entry->skb), rx_status, sizeof(*rx_status));
 543
 544         /*
 545          * Currently only PCI and SOC devices handle rx interrupts in process
 546          * context. Hence, use ieee80211_rx_irqsafe for USB and ieee80211_rx_ni
 547          * for PCI and SOC devices.
 548          */
 549         if (rt2x00_is_usb(rt2x00dev))
 550                 ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb);
 551         else
 552                 ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
 553
 554         /*
 555          * Replace the skb with the freshly allocated one.
 556          */
 557         entry->skb = skb;
 558         entry->flags = 0;
 559
 560         rt2x00dev->ops->lib->clear_entry(entry);
 561
 562         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 563 }
 564 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 565
 566 /*
 567  * Driver initialization handlers.
 568  */
 569 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 570         {
 571                 .flags = DEV_RATE_CCK,
 572                 .bitrate = 10,
 573                 .ratemask = BIT(0),
 574                 .plcp = 0x00,
 575                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 576         },
 577         {
 578                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 579                 .bitrate = 20,
 580                 .ratemask = BIT(1),
 581                 .plcp = 0x01,
 582                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 583         },
 584         {
 585                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 586                 .bitrate = 55,
 587                 .ratemask = BIT(2),
 588                 .plcp = 0x02,
 589                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 590         },
 591         {
 592                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 593                 .bitrate = 110,
 594                 .ratemask = BIT(3),
 595                 .plcp = 0x03,
 596                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 597         },
 598         {
 599                 .flags = DEV_RATE_OFDM,
 600                 .bitrate = 60,
 601                 .ratemask = BIT(4),
 602                 .plcp = 0x0b,
 603                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 604         },
 605         {
 606                 .flags = DEV_RATE_OFDM,
 607                 .bitrate = 90,
 608                 .ratemask = BIT(5),
 609                 .plcp = 0x0f,
 610                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 611         },
 612         {
 613                 .flags = DEV_RATE_OFDM,
 614                 .bitrate = 120,
 615                 .ratemask = BIT(6),
 616                 .plcp = 0x0a,
 617                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 618         },
 619         {
 620                 .flags = DEV_RATE_OFDM,
 621                 .bitrate = 180,
 622                 .ratemask = BIT(7),
 623                 .plcp = 0x0e,
 624                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 625         },
 626         {
 627                 .flags = DEV_RATE_OFDM,
 628                 .bitrate = 240,
 629                 .ratemask = BIT(8),
 630                 .plcp = 0x09,
 631                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 632         },
 633         {
 634                 .flags = DEV_RATE_OFDM,
 635                 .bitrate = 360,
 636                 .ratemask = BIT(9),
 637                 .plcp = 0x0d,
 638                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 639         },
 640         {
 641                 .flags = DEV_RATE_OFDM,
 642                 .bitrate = 480,
 643                 .ratemask = BIT(10),
 644                 .plcp = 0x08,
 645                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 646         },
 647         {
 648                 .flags = DEV_RATE_OFDM,
 649                 .bitrate = 540,
 650                 .ratemask = BIT(11),
 651                 .plcp = 0x0c,
 652                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 653         },
 654 };
 655
 656 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 657                               const int channel, const int tx_power,
 658                               const int value)
 659 {
 660         entry->center_freq = ieee80211_channel_to_frequency(channel);
 661         entry->hw_value = value;
 662         entry->max_power = tx_power;
 663         entry->max_antenna_gain = 0xff;
 664 }
 665
 666 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 667                            const u16 index, const struct rt2x00_rate *rate)
 668 {
 669         entry->flags = 0;
 670         entry->bitrate = rate->bitrate;
 671         entry->hw_value =index;
 672         entry->hw_value_short = index;
 673
 674         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 675                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 676 }
 677
 678 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 679                                     struct hw_mode_spec *spec)
 680 {
 681         struct ieee80211_hw *hw = rt2x00dev->hw;
 682         struct ieee80211_channel *channels;
 683         struct ieee80211_rate *rates;
 684         unsigned int num_rates;
 685         unsigned int i;
 686
 687         num_rates = 0;
 688         if (spec->supported_rates & SUPPORT_RATE_CCK)
 689                 num_rates += 4;
 690         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 691                 num_rates += 8;
 692
 693         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 694         if (!channels)
 695                 return -ENOMEM;
 696
 697         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 698         if (!rates)
 699                 goto exit_free_channels;
 700
 701         /*
 702          * Initialize Rate list.
 703          */
 704         for (i = 0; i < num_rates; i++)
 705                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 706
 707         /*
 708          * Initialize Channel list.
 709          */
 710         for (i = 0; i < spec->num_channels; i++) {
 711                 rt2x00lib_channel(&channels[i],
 712                                   spec->channels[i].channel,
 713                                   spec->channels_info[i].max_power, i);
 714         }
 715
 716         /*
 717          * Intitialize 802.11b, 802.11g
 718          * Rates: CCK, OFDM.
 719          * Channels: 2.4 GHz
 720          */
 721         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 722                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 723                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 724                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 725                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 726                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 727                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 728                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
 729                        &spec->ht, sizeof(spec->ht));
 730         }
 731
 732         /*
 733          * Intitialize 802.11a
 734          * Rates: OFDM.
 735          * Channels: OFDM, UNII, HiperLAN2.
 736          */
 737         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 738                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 739                     spec->num_channels - 14;
 740                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 741                     num_rates - 4;
 742                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 743                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 744                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 745                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 746                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
 747                        &spec->ht, sizeof(spec->ht));
 748         }
 749
 750         return 0;
 751
 752  exit_free_channels:
 753         kfree(channels);
 754         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 755         return -ENOMEM;
 756 }
 757
 758 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 759 {
 760         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 761                 ieee80211_unregister_hw(rt2x00dev->hw);
 762
 763         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 764                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 765                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 766                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 767                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 768         }
 769
 770         kfree(rt2x00dev->spec.channels_info);
 771 }
 772
 773 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 774 {
 775         struct hw_mode_spec *spec = &rt2x00dev->spec;
 776         int status;
 777
 778         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 779                 return 0;
 780
 781         /*
 782          * Initialize HW modes.
 783          */
 784         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 785         if (status)
 786                 return status;
 787
 788         /*
 789          * Initialize HW fields.
 790          */
 791         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 792
 793         /*
 794          * Initialize extra TX headroom required.
 795          */
 796         rt2x00dev->hw->extra_tx_headroom =
 797                 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
 798                       rt2x00dev->ops->extra_tx_headroom);
 799
 800         /*
 801          * Take TX headroom required for alignment into account.
 802          */
 803         if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
 804                 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
 805         else if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags))
 806                 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
 807
 808         /*
 809          * Register HW.
 810          */
 811         status = ieee80211_register_hw(rt2x00dev->hw);
 812         if (status)
 813                 return status;
 814
 815         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 816
 817         return 0;
 818 }
 819
 820 /*
 821  * Initialization/uninitialization handlers.
 822  */
 823 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 824 {
 825         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 826                 return;
 827
 828         /*
 829          * Unregister extra components.
 830          */
 831         rt2x00rfkill_unregister(rt2x00dev);
 832
 833         /*
 834          * Allow the HW to uninitialize.
 835          */
 836         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 837
 838         /*
 839          * Free allocated queue entries.
 840          */
 841         rt2x00queue_uninitialize(rt2x00dev);
 842 }
 843
 844 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 845 {
 846         int status;
 847
 848         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 849                 return 0;
 850
 851         /*
 852          * Allocate all queue entries.
 853          */
 854         status = rt2x00queue_initialize(rt2x00dev);
 855         if (status)
 856                 return status;
 857
 858         /*
 859          * Initialize the device.
 860          */
 861         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 862         if (status) {
 863                 rt2x00queue_uninitialize(rt2x00dev);
 864                 return status;
 865         }
 866
 867         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
 868
 869         /*
 870          * Register the extra components.
 871          */
 872         rt2x00rfkill_register(rt2x00dev);
 873
 874         return 0;
 875 }
 876
 877 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 878 {
 879         int retval;
 880
 881         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 882                 return 0;
 883
 884         /*
 885          * If this is the first interface which is added,
 886          * we should load the firmware now.
 887          */
 888         retval = rt2x00lib_load_firmware(rt2x00dev);
 889         if (retval)
 890                 return retval;
 891
 892         /*
 893          * Initialize the device.
 894          */
 895         retval = rt2x00lib_initialize(rt2x00dev);
 896         if (retval)
 897                 return retval;
 898
 899         rt2x00dev->intf_ap_count = 0;
 900         rt2x00dev->intf_sta_count = 0;
 901         rt2x00dev->intf_associated = 0;
 902
 903         /* Enable the radio */
 904         retval = rt2x00lib_enable_radio(rt2x00dev);
 905         if (retval) {
 906                 rt2x00queue_uninitialize(rt2x00dev);
 907                 return retval;
 908         }
 909
 910         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
 911
 912         return 0;
 913 }
 914
 915 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
 916 {
 917         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 918                 return;
 919
 920         /*
 921          * Perhaps we can add something smarter here,
 922          * but for now just disabling the radio should do.
 923          */
 924         rt2x00lib_disable_radio(rt2x00dev);
 925
 926         rt2x00dev->intf_ap_count = 0;
 927         rt2x00dev->intf_sta_count = 0;
 928         rt2x00dev->intf_associated = 0;
 929 }
 930
 931 /*
 932  * driver allocation handlers.
 933  */
 934 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 935 {
 936         int retval = -ENOMEM;
 937
 938         mutex_init(&rt2x00dev->csr_mutex);
 939
 940         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 941
 942         /*
 943          * Make room for rt2x00_intf inside the per-interface
 944          * structure ieee80211_vif.
 945          */
 946         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
 947
 948         /*
 949          * Determine which operating modes are supported, all modes
 950          * which require beaconing, depend on the availability of
 951          * beacon entries.
 952          */
 953         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
 954         if (rt2x00dev->ops->bcn->entry_num > 0)
 955                 rt2x00dev->hw->wiphy->interface_modes |=
 956                     BIT(NL80211_IFTYPE_ADHOC) |
 957                     BIT(NL80211_IFTYPE_AP) |
 958                     BIT(NL80211_IFTYPE_MESH_POINT) |
 959                     BIT(NL80211_IFTYPE_WDS);
 960
 961         /*
 962          * Initialize configuration work.
 963          */
 964         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
 965
 966         /*
 967          * Let the driver probe the device to detect the capabilities.
 968          */
 969         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
 970         if (retval) {
 971                 ERROR(rt2x00dev, "Failed to allocate device.\n");
 972                 goto exit;
 973         }
 974
 975         /*
 976          * Allocate queue array.
 977          */
 978         retval = rt2x00queue_allocate(rt2x00dev);
 979         if (retval)
 980                 goto exit;
 981
 982         /*
 983          * Initialize ieee80211 structure.
 984          */
 985         retval = rt2x00lib_probe_hw(rt2x00dev);
 986         if (retval) {
 987                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
 988                 goto exit;
 989         }
 990
 991         /*
 992          * Register extra components.
 993          */
 994         rt2x00link_register(rt2x00dev);
 995         rt2x00leds_register(rt2x00dev);
 996         rt2x00debug_register(rt2x00dev);
 997
 998         return 0;
 999
1000 exit:
1001         rt2x00lib_remove_dev(rt2x00dev);
1002
1003         return retval;
1004 }
1005 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1006
1007 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1008 {
1009         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1010
1011         /*
1012          * Disable radio.
1013          */
1014         rt2x00lib_disable_radio(rt2x00dev);
1015
1016         /*
1017          * Stop all work.
1018          */
1019         cancel_work_sync(&rt2x00dev->intf_work);
1020
1021         /*
1022          * Uninitialize device.
1023          */
1024         rt2x00lib_uninitialize(rt2x00dev);
1025
1026         /*
1027          * Free extra components
1028          */
1029         rt2x00debug_deregister(rt2x00dev);
1030         rt2x00leds_unregister(rt2x00dev);
1031
1032         /*
1033          * Free ieee80211_hw memory.
1034          */
1035         rt2x00lib_remove_hw(rt2x00dev);
1036
1037         /*
1038          * Free firmware image.
1039          */
1040         rt2x00lib_free_firmware(rt2x00dev);
1041
1042         /*
1043          * Free queue structures.
1044          */
1045         rt2x00queue_free(rt2x00dev);
1046 }
1047 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1048
1049 /*
1050  * Device state handlers
1051  */
1052 #ifdef CONFIG_PM
1053 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1054 {
1055         NOTICE(rt2x00dev, "Going to sleep.\n");
1056
1057         /*
1058          * Prevent mac80211 from accessing driver while suspended.
1059          */
1060         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1061                 return 0;
1062
1063         /*
1064          * Cleanup as much as possible.
1065          */
1066         rt2x00lib_uninitialize(rt2x00dev);
1067
1068         /*
1069          * Suspend/disable extra components.
1070          */
1071         rt2x00leds_suspend(rt2x00dev);
1072         rt2x00debug_deregister(rt2x00dev);
1073
1074         /*
1075          * Set device mode to sleep for power management,
1076          * on some hardware this call seems to consistently fail.
1077          * From the specifications it is hard to tell why it fails,
1078          * and if this is a "bad thing".
1079          * Overall it is safe to just ignore the failure and
1080          * continue suspending. The only downside is that the
1081          * device will not be in optimal power save mode, but with
1082          * the radio and the other components already disabled the
1083          * device is as good as disabled.
1084          */
1085         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1086                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1087                         "continue suspending.\n");
1088
1089         return 0;
1090 }
1091 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1092
1093 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1094 {
1095         NOTICE(rt2x00dev, "Waking up.\n");
1096
1097         /*
1098          * Restore/enable extra components.
1099          */
1100         rt2x00debug_register(rt2x00dev);
1101         rt2x00leds_resume(rt2x00dev);
1102
1103         /*
1104          * We are ready again to receive requests from mac80211.
1105          */
1106         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1107
1108         return 0;
1109 }
1110 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1111 #endif /* CONFIG_PM */
1112
1113 /*
1114  * rt2x00lib module information.
1115  */
1116 MODULE_AUTHOR(DRV_PROJECT);
1117 MODULE_VERSION(DRV_VERSION);
1118 MODULE_DESCRIPTION("rt2x00 library");
1119 MODULE_LICENSE("GPL");