drivers/net/wireless/rt2x00/rt2x00dev.c

   1 /*
   2         Copyright (C) 2004 - 2009 rt2x00 SourceForge Project
   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
  29 #include "rt2x00.h"
  30 #include "rt2x00lib.h"
  31
  32 /*
  33  * Radio control handlers.
  34  */
  35 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
  36 {
  37         int status;
  38
  39         /*
  40          * Don't enable the radio twice.
  41          * And check if the hardware button has been disabled.
  42          */
  43         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  44                 return 0;
  45
  46         /*
  47          * Initialize all data queues.
  48          */
  49         rt2x00queue_init_queues(rt2x00dev);
  50
  51         /*
  52          * Enable radio.
  53          */
  54         status =
  55             rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
  56         if (status)
  57                 return status;
  58
  59         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
  60
  61         rt2x00leds_led_radio(rt2x00dev, true);
  62         rt2x00led_led_activity(rt2x00dev, true);
  63
  64         set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
  65
  66         /*
  67          * Enable RX.
  68          */
  69         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
  70
  71         /*
  72          * Start the TX queues.
  73          */
  74         ieee80211_wake_queues(rt2x00dev->hw);
  75
  76         return 0;
  77 }
  78
  79 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
  80 {
  81         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  82                 return;
  83
  84         /*
  85          * Stop the TX queues in mac80211.
  86          */
  87         ieee80211_stop_queues(rt2x00dev->hw);
  88         rt2x00queue_stop_queues(rt2x00dev);
  89
  90         /*
  91          * Disable RX.
  92          */
  93         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
  94
  95         /*
  96          * Disable radio.
  97          */
  98         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
  99         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 100         rt2x00led_led_activity(rt2x00dev, false);
 101         rt2x00leds_led_radio(rt2x00dev, false);
 102 }
 103
 104 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 105 {
 106         /*
 107          * When we are disabling the RX, we should also stop the link tuner.
 108          */
 109         if (state == STATE_RADIO_RX_OFF)
 110                 rt2x00link_stop_tuner(rt2x00dev);
 111
 112         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 113
 114         /*
 115          * When we are enabling the RX, we should also start the link tuner.
 116          */
 117         if (state == STATE_RADIO_RX_ON)
 118                 rt2x00link_start_tuner(rt2x00dev);
 119 }
 120
 121 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 122                                           struct ieee80211_vif *vif)
 123 {
 124         struct rt2x00_dev *rt2x00dev = data;
 125         struct rt2x00_intf *intf = vif_to_intf(vif);
 126         int delayed_flags;
 127
 128         /*
 129          * Copy all data we need during this action under the protection
 130          * of a spinlock. Otherwise race conditions might occur which results
 131          * into an invalid configuration.
 132          */
 133         spin_lock(&intf->lock);
 134
 135         delayed_flags = intf->delayed_flags;
 136         intf->delayed_flags = 0;
 137
 138         spin_unlock(&intf->lock);
 139
 140         /*
 141          * It is possible the radio was disabled while the work had been
 142          * scheduled. If that happens we should return here immediately,
 143          * note that in the spinlock protected area above the delayed_flags
 144          * have been cleared correctly.
 145          */
 146         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 147                 return;
 148
 149         if (delayed_flags & DELAYED_UPDATE_BEACON)
 150                 rt2x00queue_update_beacon(rt2x00dev, vif, true);
 151 }
 152
 153 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 154 {
 155         struct rt2x00_dev *rt2x00dev =
 156             container_of(work, struct rt2x00_dev, intf_work);
 157
 158         /*
 159          * Iterate over each interface and perform the
 160          * requested configurations.
 161          */
 162         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 163                                             rt2x00lib_intf_scheduled_iter,
 164                                             rt2x00dev);
 165 }
 166
 167 /*
 168  * Interrupt context handlers.
 169  */
 170 static void rt2x00lib_beacondone_iter(void *data, u8 *mac,
 171                                       struct ieee80211_vif *vif)
 172 {
 173         struct rt2x00_intf *intf = vif_to_intf(vif);
 174
 175         if (vif->type != NL80211_IFTYPE_AP &&
 176             vif->type != NL80211_IFTYPE_ADHOC &&
 177             vif->type != NL80211_IFTYPE_MESH_POINT &&
 178             vif->type != NL80211_IFTYPE_WDS)
 179                 return;
 180
 181         spin_lock(&intf->lock);
 182         intf->delayed_flags |= DELAYED_UPDATE_BEACON;
 183         spin_unlock(&intf->lock);
 184 }
 185
 186 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 187 {
 188         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 189                 return;
 190
 191         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 192                                                    rt2x00lib_beacondone_iter,
 193                                                    rt2x00dev);
 194
 195         ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->intf_work);
 196 }
 197 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 198
 199 void rt2x00lib_txdone(struct queue_entry *entry,
 200                       struct txdone_entry_desc *txdesc)
 201 {
 202         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 203         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 204         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 205         enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
 206         unsigned int header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 207         u8 rate_idx, rate_flags, retry_rates;
 208         unsigned int i;
 209
 210         /*
 211          * Unmap the skb.
 212          */
 213         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 214
 215         /*
 216          * Remove L2 padding which was added during
 217          */
 218         if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
 219                 rt2x00queue_payload_align(entry->skb, true, header_length);
 220
 221         /*
 222          * If the IV/EIV data was stripped from the frame before it was
 223          * passed to the hardware, we should now reinsert it again because
 224          * mac80211 will expect the the same data to be present it the
 225          * frame as it was passed to us.
 226          */
 227         if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
 228                 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
 229
 230         /*
 231          * Send frame to debugfs immediately, after this call is completed
 232          * we are going to overwrite the skb->cb array.
 233          */
 234         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 235
 236         /*
 237          * Update TX statistics.
 238          */
 239         rt2x00dev->link.qual.tx_success +=
 240             test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 241             test_bit(TXDONE_UNKNOWN, &txdesc->flags);
 242         rt2x00dev->link.qual.tx_failed +=
 243             test_bit(TXDONE_FAILURE, &txdesc->flags);
 244
 245         rate_idx = skbdesc->tx_rate_idx;
 246         rate_flags = skbdesc->tx_rate_flags;
 247         retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
 248             (txdesc->retry + 1) : 1;
 249
 250         /*
 251          * Initialize TX status
 252          */
 253         memset(&tx_info->status, 0, sizeof(tx_info->status));
 254         tx_info->status.ack_signal = 0;
 255
 256         /*
 257          * Frame was send with retries, hardware tried
 258          * different rates to send out the frame, at each
 259          * retry it lowered the rate 1 step.
 260          */
 261         for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
 262                 tx_info->status.rates[i].idx = rate_idx - i;
 263                 tx_info->status.rates[i].flags = rate_flags;
 264                 tx_info->status.rates[i].count = 1;
 265         }
 266         if (i < (IEEE80211_TX_MAX_RATES -1))
 267                 tx_info->status.rates[i].idx = -1; /* terminate */
 268
 269         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 270                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 271                                 test_bit(TXDONE_UNKNOWN, &txdesc->flags))
 272                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 273                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 274                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 275         }
 276
 277         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 278                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
 279                                 test_bit(TXDONE_UNKNOWN, &txdesc->flags))
 280                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 281                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 282                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 283         }
 284
 285         /*
 286          * Only send the status report to mac80211 when TX status was
 287          * requested by it. If this was a extra frame coming through
 288          * a mac80211 library call (RTS/CTS) then we should not send the
 289          * status report back.
 290          */
 291         if (tx_info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)
 292                 ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb);
 293         else
 294                 dev_kfree_skb_irq(entry->skb);
 295
 296         /*
 297          * Make this entry available for reuse.
 298          */
 299         entry->skb = NULL;
 300         entry->flags = 0;
 301
 302         rt2x00dev->ops->lib->clear_entry(entry);
 303
 304         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 305         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 306
 307         /*
 308          * If the data queue was below the threshold before the txdone
 309          * handler we must make sure the packet queue in the mac80211 stack
 310          * is reenabled when the txdone handler has finished.
 311          */
 312         if (!rt2x00queue_threshold(entry->queue))
 313                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 314 }
 315 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 316
 317 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 318                                         struct rxdone_entry_desc *rxdesc)
 319 {
 320         struct ieee80211_supported_band *sband;
 321         const struct rt2x00_rate *rate;
 322         unsigned int i;
 323         int signal;
 324         int type;
 325
 326         /*
 327          * For non-HT rates the MCS value needs to contain the
 328          * actually used rate modulation (CCK or OFDM).
 329          */
 330         if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 331                 signal = RATE_MCS(rxdesc->rate_mode, rxdesc->signal);
 332         else
 333                 signal = rxdesc->signal;
 334
 335         type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 336
 337         sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 338         for (i = 0; i < sband->n_bitrates; i++) {
 339                 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 340
 341                 if (((type == RXDONE_SIGNAL_PLCP) &&
 342                      (rate->plcp == signal)) ||
 343                     ((type == RXDONE_SIGNAL_BITRATE) &&
 344                       (rate->bitrate == signal)) ||
 345                     ((type == RXDONE_SIGNAL_MCS) &&
 346                       (rate->mcs == signal))) {
 347                         return i;
 348                 }
 349         }
 350
 351         WARNING(rt2x00dev, "Frame received with unrecognized signal, "
 352                 "signal=0x%.4x, type=%d.\n", signal, type);
 353         return 0;
 354 }
 355
 356 void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
 357                       struct queue_entry *entry)
 358 {
 359         struct rxdone_entry_desc rxdesc;
 360         struct sk_buff *skb;
 361         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 362         unsigned int header_length;
 363         bool l2pad;
 364         int rate_idx;
 365         /*
 366          * Allocate a new sk_buffer. If no new buffer available, drop the
 367          * received frame and reuse the existing buffer.
 368          */
 369         skb = rt2x00queue_alloc_rxskb(rt2x00dev, entry);
 370         if (!skb)
 371                 return;
 372
 373         /*
 374          * Unmap the skb.
 375          */
 376         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 377
 378         /*
 379          * Extract the RXD details.
 380          */
 381         memset(&rxdesc, 0, sizeof(rxdesc));
 382         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 383
 384         /* Trim buffer to correct size */
 385         skb_trim(entry->skb, rxdesc.size);
 386
 387         /*
 388          * The data behind the ieee80211 header must be
 389          * aligned on a 4 byte boundary.
 390          */
 391         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 392         l2pad = !!(rxdesc.dev_flags & RXDONE_L2PAD);
 393
 394         /*
 395          * Hardware might have stripped the IV/EIV/ICV data,
 396          * in that case it is possible that the data was
 397          * provided seperately (through hardware descriptor)
 398          * in which case we should reinsert the data into the frame.
 399          */
 400         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 401             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 402                 rt2x00crypto_rx_insert_iv(entry->skb, l2pad, header_length,
 403                                           &rxdesc);
 404         else
 405                 rt2x00queue_payload_align(entry->skb, l2pad, header_length);
 406
 407         /*
 408          * Check if the frame was received using HT. In that case,
 409          * the rate is the MCS index and should be passed to mac80211
 410          * directly. Otherwise we need to translate the signal to
 411          * the correct bitrate index.
 412          */
 413         if (rxdesc.rate_mode == RATE_MODE_CCK ||
 414             rxdesc.rate_mode == RATE_MODE_OFDM) {
 415                 rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 416         } else {
 417                 rxdesc.flags |= RX_FLAG_HT;
 418                 rate_idx = rxdesc.signal;
 419         }
 420
 421         /*
 422          * Update extra components
 423          */
 424         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 425         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 426
 427         rx_status->mactime = rxdesc.timestamp;
 428         rx_status->rate_idx = rate_idx;
 429         rx_status->qual = rt2x00link_calculate_signal(rt2x00dev, rxdesc.rssi);
 430         rx_status->signal = rxdesc.rssi;
 431         rx_status->noise = rxdesc.noise;
 432         rx_status->flag = rxdesc.flags;
 433         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 434
 435         /*
 436          * Send frame to mac80211 & debugfs.
 437          * mac80211 will clean up the skb structure.
 438          */
 439         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 440         memcpy(IEEE80211_SKB_RXCB(entry->skb), rx_status, sizeof(*rx_status));
 441         ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb);
 442
 443         /*
 444          * Replace the skb with the freshly allocated one.
 445          */
 446         entry->skb = skb;
 447         entry->flags = 0;
 448
 449         rt2x00dev->ops->lib->clear_entry(entry);
 450
 451         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 452 }
 453 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 454
 455 /*
 456  * Driver initialization handlers.
 457  */
 458 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 459         {
 460                 .flags = DEV_RATE_CCK,
 461                 .bitrate = 10,
 462                 .ratemask = BIT(0),
 463                 .plcp = 0x00,
 464                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 465         },
 466         {
 467                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 468                 .bitrate = 20,
 469                 .ratemask = BIT(1),
 470                 .plcp = 0x01,
 471                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 472         },
 473         {
 474                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 475                 .bitrate = 55,
 476                 .ratemask = BIT(2),
 477                 .plcp = 0x02,
 478                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 479         },
 480         {
 481                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 482                 .bitrate = 110,
 483                 .ratemask = BIT(3),
 484                 .plcp = 0x03,
 485                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 486         },
 487         {
 488                 .flags = DEV_RATE_OFDM,
 489                 .bitrate = 60,
 490                 .ratemask = BIT(4),
 491                 .plcp = 0x0b,
 492                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 493         },
 494         {
 495                 .flags = DEV_RATE_OFDM,
 496                 .bitrate = 90,
 497                 .ratemask = BIT(5),
 498                 .plcp = 0x0f,
 499                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 500         },
 501         {
 502                 .flags = DEV_RATE_OFDM,
 503                 .bitrate = 120,
 504                 .ratemask = BIT(6),
 505                 .plcp = 0x0a,
 506                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 507         },
 508         {
 509                 .flags = DEV_RATE_OFDM,
 510                 .bitrate = 180,
 511                 .ratemask = BIT(7),
 512                 .plcp = 0x0e,
 513                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 514         },
 515         {
 516                 .flags = DEV_RATE_OFDM,
 517                 .bitrate = 240,
 518                 .ratemask = BIT(8),
 519                 .plcp = 0x09,
 520                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 521         },
 522         {
 523                 .flags = DEV_RATE_OFDM,
 524                 .bitrate = 360,
 525                 .ratemask = BIT(9),
 526                 .plcp = 0x0d,
 527                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 528         },
 529         {
 530                 .flags = DEV_RATE_OFDM,
 531                 .bitrate = 480,
 532                 .ratemask = BIT(10),
 533                 .plcp = 0x08,
 534                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 535         },
 536         {
 537                 .flags = DEV_RATE_OFDM,
 538                 .bitrate = 540,
 539                 .ratemask = BIT(11),
 540                 .plcp = 0x0c,
 541                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 542         },
 543 };
 544
 545 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 546                               const int channel, const int tx_power,
 547                               const int value)
 548 {
 549         entry->center_freq = ieee80211_channel_to_frequency(channel);
 550         entry->hw_value = value;
 551         entry->max_power = tx_power;
 552         entry->max_antenna_gain = 0xff;
 553 }
 554
 555 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 556                            const u16 index, const struct rt2x00_rate *rate)
 557 {
 558         entry->flags = 0;
 559         entry->bitrate = rate->bitrate;
 560         entry->hw_value =index;
 561         entry->hw_value_short = index;
 562
 563         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 564                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 565 }
 566
 567 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 568                                     struct hw_mode_spec *spec)
 569 {
 570         struct ieee80211_hw *hw = rt2x00dev->hw;
 571         struct ieee80211_channel *channels;
 572         struct ieee80211_rate *rates;
 573         unsigned int num_rates;
 574         unsigned int i;
 575
 576         num_rates = 0;
 577         if (spec->supported_rates & SUPPORT_RATE_CCK)
 578                 num_rates += 4;
 579         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 580                 num_rates += 8;
 581
 582         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 583         if (!channels)
 584                 return -ENOMEM;
 585
 586         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 587         if (!rates)
 588                 goto exit_free_channels;
 589
 590         /*
 591          * Initialize Rate list.
 592          */
 593         for (i = 0; i < num_rates; i++)
 594                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 595
 596         /*
 597          * Initialize Channel list.
 598          */
 599         for (i = 0; i < spec->num_channels; i++) {
 600                 rt2x00lib_channel(&channels[i],
 601                                   spec->channels[i].channel,
 602                                   spec->channels_info[i].tx_power1, i);
 603         }
 604
 605         /*
 606          * Intitialize 802.11b, 802.11g
 607          * Rates: CCK, OFDM.
 608          * Channels: 2.4 GHz
 609          */
 610         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 611                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 612                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 613                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 614                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 615                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 616                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 617                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
 618                        &spec->ht, sizeof(spec->ht));
 619         }
 620
 621         /*
 622          * Intitialize 802.11a
 623          * Rates: OFDM.
 624          * Channels: OFDM, UNII, HiperLAN2.
 625          */
 626         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 627                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 628                     spec->num_channels - 14;
 629                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 630                     num_rates - 4;
 631                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 632                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 633                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 634                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 635                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
 636                        &spec->ht, sizeof(spec->ht));
 637         }
 638
 639         return 0;
 640
 641  exit_free_channels:
 642         kfree(channels);
 643         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 644         return -ENOMEM;
 645 }
 646
 647 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 648 {
 649         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 650                 ieee80211_unregister_hw(rt2x00dev->hw);
 651
 652         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 653                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 654                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 655                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 656                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 657         }
 658
 659         kfree(rt2x00dev->spec.channels_info);
 660 }
 661
 662 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 663 {
 664         struct hw_mode_spec *spec = &rt2x00dev->spec;
 665         int status;
 666
 667         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 668                 return 0;
 669
 670         /*
 671          * Initialize HW modes.
 672          */
 673         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 674         if (status)
 675                 return status;
 676
 677         /*
 678          * Initialize HW fields.
 679          */
 680         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 681
 682         /*
 683          * Register HW.
 684          */
 685         status = ieee80211_register_hw(rt2x00dev->hw);
 686         if (status)
 687                 return status;
 688
 689         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 690
 691         return 0;
 692 }
 693
 694 /*
 695  * Initialization/uninitialization handlers.
 696  */
 697 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 698 {
 699         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 700                 return;
 701
 702         /*
 703          * Unregister extra components.
 704          */
 705         rt2x00rfkill_unregister(rt2x00dev);
 706
 707         /*
 708          * Allow the HW to uninitialize.
 709          */
 710         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 711
 712         /*
 713          * Free allocated queue entries.
 714          */
 715         rt2x00queue_uninitialize(rt2x00dev);
 716 }
 717
 718 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 719 {
 720         int status;
 721
 722         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 723                 return 0;
 724
 725         /*
 726          * Allocate all queue entries.
 727          */
 728         status = rt2x00queue_initialize(rt2x00dev);
 729         if (status)
 730                 return status;
 731
 732         /*
 733          * Initialize the device.
 734          */
 735         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 736         if (status) {
 737                 rt2x00queue_uninitialize(rt2x00dev);
 738                 return status;
 739         }
 740
 741         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
 742
 743         /*
 744          * Register the extra components.
 745          */
 746         rt2x00rfkill_register(rt2x00dev);
 747
 748         return 0;
 749 }
 750
 751 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 752 {
 753         int retval;
 754
 755         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 756                 return 0;
 757
 758         /*
 759          * If this is the first interface which is added,
 760          * we should load the firmware now.
 761          */
 762         retval = rt2x00lib_load_firmware(rt2x00dev);
 763         if (retval)
 764                 return retval;
 765
 766         /*
 767          * Initialize the device.
 768          */
 769         retval = rt2x00lib_initialize(rt2x00dev);
 770         if (retval)
 771                 return retval;
 772
 773         rt2x00dev->intf_ap_count = 0;
 774         rt2x00dev->intf_sta_count = 0;
 775         rt2x00dev->intf_associated = 0;
 776
 777         /* Enable the radio */
 778         retval = rt2x00lib_enable_radio(rt2x00dev);
 779         if (retval) {
 780                 rt2x00queue_uninitialize(rt2x00dev);
 781                 return retval;
 782         }
 783
 784         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
 785
 786         return 0;
 787 }
 788
 789 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
 790 {
 791         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 792                 return;
 793
 794         /*
 795          * Perhaps we can add something smarter here,
 796          * but for now just disabling the radio should do.
 797          */
 798         rt2x00lib_disable_radio(rt2x00dev);
 799
 800         rt2x00dev->intf_ap_count = 0;
 801         rt2x00dev->intf_sta_count = 0;
 802         rt2x00dev->intf_associated = 0;
 803 }
 804
 805 /*
 806  * driver allocation handlers.
 807  */
 808 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 809 {
 810         int retval = -ENOMEM;
 811
 812         mutex_init(&rt2x00dev->csr_mutex);
 813
 814         /*
 815          * Make room for rt2x00_intf inside the per-interface
 816          * structure ieee80211_vif.
 817          */
 818         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
 819
 820         /*
 821          * Determine which operating modes are supported, all modes
 822          * which require beaconing, depend on the availability of
 823          * beacon entries.
 824          */
 825         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
 826         if (rt2x00dev->ops->bcn->entry_num > 0)
 827                 rt2x00dev->hw->wiphy->interface_modes |=
 828                     BIT(NL80211_IFTYPE_ADHOC) |
 829                     BIT(NL80211_IFTYPE_AP) |
 830                     BIT(NL80211_IFTYPE_MESH_POINT) |
 831                     BIT(NL80211_IFTYPE_WDS);
 832
 833         /*
 834          * Let the driver probe the device to detect the capabilities.
 835          */
 836         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
 837         if (retval) {
 838                 ERROR(rt2x00dev, "Failed to allocate device.\n");
 839                 goto exit;
 840         }
 841
 842         /*
 843          * Initialize configuration work.
 844          */
 845         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
 846
 847         /*
 848          * Allocate queue array.
 849          */
 850         retval = rt2x00queue_allocate(rt2x00dev);
 851         if (retval)
 852                 goto exit;
 853
 854         /*
 855          * Initialize ieee80211 structure.
 856          */
 857         retval = rt2x00lib_probe_hw(rt2x00dev);
 858         if (retval) {
 859                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
 860                 goto exit;
 861         }
 862
 863         /*
 864          * Register extra components.
 865          */
 866         rt2x00link_register(rt2x00dev);
 867         rt2x00leds_register(rt2x00dev);
 868         rt2x00debug_register(rt2x00dev);
 869
 870         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 871
 872         return 0;
 873
 874 exit:
 875         rt2x00lib_remove_dev(rt2x00dev);
 876
 877         return retval;
 878 }
 879 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
 880
 881 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
 882 {
 883         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 884
 885         /*
 886          * Disable radio.
 887          */
 888         rt2x00lib_disable_radio(rt2x00dev);
 889
 890         /*
 891          * Stop all work.
 892          */
 893         cancel_work_sync(&rt2x00dev->intf_work);
 894
 895         /*
 896          * Uninitialize device.
 897          */
 898         rt2x00lib_uninitialize(rt2x00dev);
 899
 900         /*
 901          * Free extra components
 902          */
 903         rt2x00debug_deregister(rt2x00dev);
 904         rt2x00leds_unregister(rt2x00dev);
 905
 906         /*
 907          * Free ieee80211_hw memory.
 908          */
 909         rt2x00lib_remove_hw(rt2x00dev);
 910
 911         /*
 912          * Free firmware image.
 913          */
 914         rt2x00lib_free_firmware(rt2x00dev);
 915
 916         /*
 917          * Free queue structures.
 918          */
 919         rt2x00queue_free(rt2x00dev);
 920 }
 921 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
 922
 923 /*
 924  * Device state handlers
 925  */
 926 #ifdef CONFIG_PM
 927 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
 928 {
 929         NOTICE(rt2x00dev, "Going to sleep.\n");
 930
 931         /*
 932          * Prevent mac80211 from accessing driver while suspended.
 933          */
 934         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 935                 return 0;
 936
 937         /*
 938          * Cleanup as much as possible.
 939          */
 940         rt2x00lib_uninitialize(rt2x00dev);
 941
 942         /*
 943          * Suspend/disable extra components.
 944          */
 945         rt2x00leds_suspend(rt2x00dev);
 946         rt2x00debug_deregister(rt2x00dev);
 947
 948         /*
 949          * Set device mode to sleep for power management,
 950          * on some hardware this call seems to consistently fail.
 951          * From the specifications it is hard to tell why it fails,
 952          * and if this is a "bad thing".
 953          * Overall it is safe to just ignore the failure and
 954          * continue suspending. The only downside is that the
 955          * device will not be in optimal power save mode, but with
 956          * the radio and the other components already disabled the
 957          * device is as good as disabled.
 958          */
 959         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
 960                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
 961                         "continue suspending.\n");
 962
 963         return 0;
 964 }
 965 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
 966
 967 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
 968 {
 969         NOTICE(rt2x00dev, "Waking up.\n");
 970
 971         /*
 972          * Restore/enable extra components.
 973          */
 974         rt2x00debug_register(rt2x00dev);
 975         rt2x00leds_resume(rt2x00dev);
 976
 977         /*
 978          * We are ready again to receive requests from mac80211.
 979          */
 980         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 981
 982         return 0;
 983 }
 984 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
 985 #endif /* CONFIG_PM */
 986
 987 /*
 988  * rt2x00lib module information.
 989  */
 990 MODULE_AUTHOR(DRV_PROJECT);
 991 MODULE_VERSION(DRV_VERSION);
 992 MODULE_DESCRIPTION("rt2x00 library");
 993 MODULE_LICENSE("GPL");