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             test_bit(DEVICE_STATE_DISABLED_RADIO_HW, &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 the TX queues.
  74          */
  75         ieee80211_wake_queues(rt2x00dev->hw);
  76
  77         return 0;
  78 }
  79
  80 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
  81 {
  82         if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
  83                 return;
  84
  85         /*
  86          * Stop the TX queues in mac80211.
  87          */
  88         ieee80211_stop_queues(rt2x00dev->hw);
  89         rt2x00queue_stop_queues(rt2x00dev);
  90
  91         /*
  92          * Disable RX.
  93          */
  94         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
  95
  96         /*
  97          * Disable radio.
  98          */
  99         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
 100         rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
 101         rt2x00led_led_activity(rt2x00dev, false);
 102         rt2x00leds_led_radio(rt2x00dev, false);
 103 }
 104
 105 void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 106 {
 107         /*
 108          * When we are disabling the RX, we should also stop the link tuner.
 109          */
 110         if (state == STATE_RADIO_RX_OFF)
 111                 rt2x00link_stop_tuner(rt2x00dev);
 112
 113         rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
 114
 115         /*
 116          * When we are enabling the RX, we should also start the link tuner.
 117          */
 118         if (state == STATE_RADIO_RX_ON)
 119                 rt2x00link_start_tuner(rt2x00dev);
 120 }
 121
 122 static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
 123 {
 124         struct rt2x00_dev *rt2x00dev =
 125             container_of(work, struct rt2x00_dev, filter_work);
 126
 127         rt2x00dev->ops->lib->config_filter(rt2x00dev, rt2x00dev->packet_filter);
 128 }
 129
 130 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 131                                           struct ieee80211_vif *vif)
 132 {
 133         struct rt2x00_dev *rt2x00dev = data;
 134         struct rt2x00_intf *intf = vif_to_intf(vif);
 135         struct ieee80211_bss_conf conf;
 136         int delayed_flags;
 137
 138         /*
 139          * Copy all data we need during this action under the protection
 140          * of a spinlock. Otherwise race conditions might occur which results
 141          * into an invalid configuration.
 142          */
 143         spin_lock(&intf->lock);
 144
 145         memcpy(&conf, &vif->bss_conf, sizeof(conf));
 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         if (delayed_flags & DELAYED_CONFIG_ERP)
 164                 rt2x00lib_config_erp(rt2x00dev, intf, &conf);
 165
 166         if (delayed_flags & DELAYED_LED_ASSOC)
 167                 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
 168 }
 169
 170 static void rt2x00lib_intf_scheduled(struct work_struct *work)
 171 {
 172         struct rt2x00_dev *rt2x00dev =
 173             container_of(work, struct rt2x00_dev, intf_work);
 174
 175         /*
 176          * Iterate over each interface and perform the
 177          * requested configurations.
 178          */
 179         ieee80211_iterate_active_interfaces(rt2x00dev->hw,
 180                                             rt2x00lib_intf_scheduled_iter,
 181                                             rt2x00dev);
 182 }
 183
 184 /*
 185  * Interrupt context handlers.
 186  */
 187 static void rt2x00lib_beacondone_iter(void *data, u8 *mac,
 188                                       struct ieee80211_vif *vif)
 189 {
 190         struct rt2x00_dev *rt2x00dev = data;
 191         struct rt2x00_intf *intf = vif_to_intf(vif);
 192
 193         if (vif->type != NL80211_IFTYPE_AP &&
 194             vif->type != NL80211_IFTYPE_ADHOC &&
 195             vif->type != NL80211_IFTYPE_MESH_POINT &&
 196             vif->type != NL80211_IFTYPE_WDS)
 197                 return;
 198
 199         /*
 200          * Clean up the beacon skb.
 201          */
 202         rt2x00queue_free_skb(rt2x00dev, intf->beacon->skb);
 203         intf->beacon->skb = NULL;
 204
 205         spin_lock(&intf->lock);
 206         intf->delayed_flags |= DELAYED_UPDATE_BEACON;
 207         spin_unlock(&intf->lock);
 208 }
 209
 210 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
 211 {
 212         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 213                 return;
 214
 215         ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 216                                                    rt2x00lib_beacondone_iter,
 217                                                    rt2x00dev);
 218
 219         queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->intf_work);
 220 }
 221 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
 222
 223 void rt2x00lib_txdone(struct queue_entry *entry,
 224                       struct txdone_entry_desc *txdesc)
 225 {
 226         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 227         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
 228         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 229         enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
 230         unsigned int header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 231         u8 rate_idx, rate_flags;
 232
 233         /*
 234          * Unmap the skb.
 235          */
 236         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 237
 238         /*
 239          * Remove L2 padding which was added during
 240          */
 241         if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
 242                 rt2x00queue_payload_align(entry->skb, true, header_length);
 243
 244         /*
 245          * If the IV/EIV data was stripped from the frame before it was
 246          * passed to the hardware, we should now reinsert it again because
 247          * mac80211 will expect the the same data to be present it the
 248          * frame as it was passed to us.
 249          */
 250         if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
 251                 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
 252
 253         /*
 254          * Send frame to debugfs immediately, after this call is completed
 255          * we are going to overwrite the skb->cb array.
 256          */
 257         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 258
 259         /*
 260          * Update TX statistics.
 261          */
 262         rt2x00dev->link.qual.tx_success +=
 263             test_bit(TXDONE_SUCCESS, &txdesc->flags);
 264         rt2x00dev->link.qual.tx_failed +=
 265             test_bit(TXDONE_FAILURE, &txdesc->flags);
 266
 267         rate_idx = skbdesc->tx_rate_idx;
 268         rate_flags = skbdesc->tx_rate_flags;
 269
 270         /*
 271          * Initialize TX status
 272          */
 273         memset(&tx_info->status, 0, sizeof(tx_info->status));
 274         tx_info->status.ack_signal = 0;
 275         tx_info->status.rates[0].idx = rate_idx;
 276         tx_info->status.rates[0].flags = rate_flags;
 277         tx_info->status.rates[0].count = txdesc->retry + 1;
 278         tx_info->status.rates[1].idx = -1; /* terminate */
 279
 280         if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 281                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 282                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 283                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 284                         rt2x00dev->low_level_stats.dot11ACKFailureCount++;
 285         }
 286
 287         if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 288                 if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
 289                         rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
 290                 else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
 291                         rt2x00dev->low_level_stats.dot11RTSFailureCount++;
 292         }
 293
 294         /*
 295          * Only send the status report to mac80211 when TX status was
 296          * requested by it. If this was a extra frame coming through
 297          * a mac80211 library call (RTS/CTS) then we should not send the
 298          * status report back.
 299          */
 300         if (tx_info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)
 301                 ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb);
 302         else
 303                 dev_kfree_skb_irq(entry->skb);
 304
 305         /*
 306          * Make this entry available for reuse.
 307          */
 308         entry->skb = NULL;
 309         entry->flags = 0;
 310
 311         rt2x00dev->ops->lib->clear_entry(entry);
 312
 313         clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 314         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 315
 316         /*
 317          * If the data queue was below the threshold before the txdone
 318          * handler we must make sure the packet queue in the mac80211 stack
 319          * is reenabled when the txdone handler has finished.
 320          */
 321         if (!rt2x00queue_threshold(entry->queue))
 322                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 323 }
 324 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
 325
 326 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 327                                         struct rxdone_entry_desc *rxdesc)
 328 {
 329         struct ieee80211_supported_band *sband;
 330         const struct rt2x00_rate *rate;
 331         unsigned int i;
 332         int signal;
 333         int type;
 334
 335         /*
 336          * For non-HT rates the MCS value needs to contain the
 337          * actually used rate modulation (CCK or OFDM).
 338          */
 339         if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
 340                 signal = RATE_MCS(rxdesc->rate_mode, rxdesc->signal);
 341         else
 342                 signal = rxdesc->signal;
 343
 344         type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
 345
 346         sband = &rt2x00dev->bands[rt2x00dev->curr_band];
 347         for (i = 0; i < sband->n_bitrates; i++) {
 348                 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
 349
 350                 if (((type == RXDONE_SIGNAL_PLCP) &&
 351                      (rate->plcp == signal)) ||
 352                     ((type == RXDONE_SIGNAL_BITRATE) &&
 353                       (rate->bitrate == signal)) ||
 354                     ((type == RXDONE_SIGNAL_MCS) &&
 355                       (rate->mcs == signal))) {
 356                         return i;
 357                 }
 358         }
 359
 360         WARNING(rt2x00dev, "Frame received with unrecognized signal, "
 361                 "signal=0x%.4x, type=%d.\n", signal, type);
 362         return 0;
 363 }
 364
 365 void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
 366                       struct queue_entry *entry)
 367 {
 368         struct rxdone_entry_desc rxdesc;
 369         struct sk_buff *skb;
 370         struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
 371         unsigned int header_length;
 372         bool l2pad;
 373         int rate_idx;
 374         /*
 375          * Allocate a new sk_buffer. If no new buffer available, drop the
 376          * received frame and reuse the existing buffer.
 377          */
 378         skb = rt2x00queue_alloc_rxskb(rt2x00dev, entry);
 379         if (!skb)
 380                 return;
 381
 382         /*
 383          * Unmap the skb.
 384          */
 385         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 386
 387         /*
 388          * Extract the RXD details.
 389          */
 390         memset(&rxdesc, 0, sizeof(rxdesc));
 391         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 392
 393         /* Trim buffer to correct size */
 394         skb_trim(entry->skb, rxdesc.size);
 395
 396         /*
 397          * The data behind the ieee80211 header must be
 398          * aligned on a 4 byte boundary.
 399          */
 400         header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
 401         l2pad = !!(rxdesc.dev_flags & RXDONE_L2PAD);
 402
 403         /*
 404          * Hardware might have stripped the IV/EIV/ICV data,
 405          * in that case it is possible that the data was
 406          * provided seperately (through hardware descriptor)
 407          * in which case we should reinsert the data into the frame.
 408          */
 409         if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
 410             (rxdesc.flags & RX_FLAG_IV_STRIPPED))
 411                 rt2x00crypto_rx_insert_iv(entry->skb, l2pad, header_length,
 412                                           &rxdesc);
 413         else
 414                 rt2x00queue_payload_align(entry->skb, l2pad, header_length);
 415
 416         /*
 417          * Check if the frame was received using HT. In that case,
 418          * the rate is the MCS index and should be passed to mac80211
 419          * directly. Otherwise we need to translate the signal to
 420          * the correct bitrate index.
 421          */
 422         if (rxdesc.rate_mode == RATE_MODE_CCK ||
 423             rxdesc.rate_mode == RATE_MODE_OFDM) {
 424                 rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
 425         } else {
 426                 rxdesc.flags |= RX_FLAG_HT;
 427                 rate_idx = rxdesc.signal;
 428         }
 429
 430         /*
 431          * Update extra components
 432          */
 433         rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
 434         rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
 435
 436         rx_status->mactime = rxdesc.timestamp;
 437         rx_status->rate_idx = rate_idx;
 438         rx_status->qual = rt2x00link_calculate_signal(rt2x00dev, rxdesc.rssi);
 439         rx_status->signal = rxdesc.rssi;
 440         rx_status->noise = rxdesc.noise;
 441         rx_status->flag = rxdesc.flags;
 442         rx_status->antenna = rt2x00dev->link.ant.active.rx;
 443
 444         /*
 445          * Send frame to mac80211 & debugfs.
 446          * mac80211 will clean up the skb structure.
 447          */
 448         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
 449         ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb, rx_status);
 450
 451         /*
 452          * Replace the skb with the freshly allocated one.
 453          */
 454         entry->skb = skb;
 455         entry->flags = 0;
 456
 457         rt2x00dev->ops->lib->clear_entry(entry);
 458
 459         rt2x00queue_index_inc(entry->queue, Q_INDEX);
 460 }
 461 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
 462
 463 /*
 464  * Driver initialization handlers.
 465  */
 466 const struct rt2x00_rate rt2x00_supported_rates[12] = {
 467         {
 468                 .flags = DEV_RATE_CCK,
 469                 .bitrate = 10,
 470                 .ratemask = BIT(0),
 471                 .plcp = 0x00,
 472                 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
 473         },
 474         {
 475                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 476                 .bitrate = 20,
 477                 .ratemask = BIT(1),
 478                 .plcp = 0x01,
 479                 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
 480         },
 481         {
 482                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 483                 .bitrate = 55,
 484                 .ratemask = BIT(2),
 485                 .plcp = 0x02,
 486                 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
 487         },
 488         {
 489                 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 490                 .bitrate = 110,
 491                 .ratemask = BIT(3),
 492                 .plcp = 0x03,
 493                 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
 494         },
 495         {
 496                 .flags = DEV_RATE_OFDM,
 497                 .bitrate = 60,
 498                 .ratemask = BIT(4),
 499                 .plcp = 0x0b,
 500                 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 501         },
 502         {
 503                 .flags = DEV_RATE_OFDM,
 504                 .bitrate = 90,
 505                 .ratemask = BIT(5),
 506                 .plcp = 0x0f,
 507                 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 508         },
 509         {
 510                 .flags = DEV_RATE_OFDM,
 511                 .bitrate = 120,
 512                 .ratemask = BIT(6),
 513                 .plcp = 0x0a,
 514                 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 515         },
 516         {
 517                 .flags = DEV_RATE_OFDM,
 518                 .bitrate = 180,
 519                 .ratemask = BIT(7),
 520                 .plcp = 0x0e,
 521                 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 522         },
 523         {
 524                 .flags = DEV_RATE_OFDM,
 525                 .bitrate = 240,
 526                 .ratemask = BIT(8),
 527                 .plcp = 0x09,
 528                 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 529         },
 530         {
 531                 .flags = DEV_RATE_OFDM,
 532                 .bitrate = 360,
 533                 .ratemask = BIT(9),
 534                 .plcp = 0x0d,
 535                 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 536         },
 537         {
 538                 .flags = DEV_RATE_OFDM,
 539                 .bitrate = 480,
 540                 .ratemask = BIT(10),
 541                 .plcp = 0x08,
 542                 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 543         },
 544         {
 545                 .flags = DEV_RATE_OFDM,
 546                 .bitrate = 540,
 547                 .ratemask = BIT(11),
 548                 .plcp = 0x0c,
 549                 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 550         },
 551 };
 552
 553 static void rt2x00lib_channel(struct ieee80211_channel *entry,
 554                               const int channel, const int tx_power,
 555                               const int value)
 556 {
 557         entry->center_freq = ieee80211_channel_to_frequency(channel);
 558         entry->hw_value = value;
 559         entry->max_power = tx_power;
 560         entry->max_antenna_gain = 0xff;
 561 }
 562
 563 static void rt2x00lib_rate(struct ieee80211_rate *entry,
 564                            const u16 index, const struct rt2x00_rate *rate)
 565 {
 566         entry->flags = 0;
 567         entry->bitrate = rate->bitrate;
 568         entry->hw_value =index;
 569         entry->hw_value_short = index;
 570
 571         if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
 572                 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 573 }
 574
 575 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
 576                                     struct hw_mode_spec *spec)
 577 {
 578         struct ieee80211_hw *hw = rt2x00dev->hw;
 579         struct ieee80211_channel *channels;
 580         struct ieee80211_rate *rates;
 581         unsigned int num_rates;
 582         unsigned int i;
 583
 584         num_rates = 0;
 585         if (spec->supported_rates & SUPPORT_RATE_CCK)
 586                 num_rates += 4;
 587         if (spec->supported_rates & SUPPORT_RATE_OFDM)
 588                 num_rates += 8;
 589
 590         channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
 591         if (!channels)
 592                 return -ENOMEM;
 593
 594         rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
 595         if (!rates)
 596                 goto exit_free_channels;
 597
 598         /*
 599          * Initialize Rate list.
 600          */
 601         for (i = 0; i < num_rates; i++)
 602                 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
 603
 604         /*
 605          * Initialize Channel list.
 606          */
 607         for (i = 0; i < spec->num_channels; i++) {
 608                 rt2x00lib_channel(&channels[i],
 609                                   spec->channels[i].channel,
 610                                   spec->channels_info[i].tx_power1, i);
 611         }
 612
 613         /*
 614          * Intitialize 802.11b, 802.11g
 615          * Rates: CCK, OFDM.
 616          * Channels: 2.4 GHz
 617          */
 618         if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
 619                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
 620                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
 621                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
 622                 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 623                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 624                     &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
 625                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
 626                        &spec->ht, sizeof(spec->ht));
 627         }
 628
 629         /*
 630          * Intitialize 802.11a
 631          * Rates: OFDM.
 632          * Channels: OFDM, UNII, HiperLAN2.
 633          */
 634         if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
 635                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
 636                     spec->num_channels - 14;
 637                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
 638                     num_rates - 4;
 639                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
 640                 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 641                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 642                     &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
 643                 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
 644                        &spec->ht, sizeof(spec->ht));
 645         }
 646
 647         return 0;
 648
 649  exit_free_channels:
 650         kfree(channels);
 651         ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
 652         return -ENOMEM;
 653 }
 654
 655 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
 656 {
 657         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 658                 ieee80211_unregister_hw(rt2x00dev->hw);
 659
 660         if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
 661                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
 662                 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
 663                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
 664                 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
 665         }
 666
 667         kfree(rt2x00dev->spec.channels_info);
 668 }
 669
 670 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 671 {
 672         struct hw_mode_spec *spec = &rt2x00dev->spec;
 673         int status;
 674
 675         if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
 676                 return 0;
 677
 678         /*
 679          * Initialize HW modes.
 680          */
 681         status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
 682         if (status)
 683                 return status;
 684
 685         /*
 686          * Initialize HW fields.
 687          */
 688         rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
 689
 690         /*
 691          * Register HW.
 692          */
 693         status = ieee80211_register_hw(rt2x00dev->hw);
 694         if (status)
 695                 return status;
 696
 697         set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
 698
 699         return 0;
 700 }
 701
 702 /*
 703  * Initialization/uninitialization handlers.
 704  */
 705 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
 706 {
 707         if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 708                 return;
 709
 710         /*
 711          * Unregister extra components.
 712          */
 713         rt2x00rfkill_unregister(rt2x00dev);
 714
 715         /*
 716          * Allow the HW to uninitialize.
 717          */
 718         rt2x00dev->ops->lib->uninitialize(rt2x00dev);
 719
 720         /*
 721          * Free allocated queue entries.
 722          */
 723         rt2x00queue_uninitialize(rt2x00dev);
 724 }
 725
 726 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
 727 {
 728         int status;
 729
 730         if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
 731                 return 0;
 732
 733         /*
 734          * Allocate all queue entries.
 735          */
 736         status = rt2x00queue_initialize(rt2x00dev);
 737         if (status)
 738                 return status;
 739
 740         /*
 741          * Initialize the device.
 742          */
 743         status = rt2x00dev->ops->lib->initialize(rt2x00dev);
 744         if (status) {
 745                 rt2x00queue_uninitialize(rt2x00dev);
 746                 return status;
 747         }
 748
 749         set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
 750
 751         /*
 752          * Register the extra components.
 753          */
 754         rt2x00rfkill_register(rt2x00dev);
 755
 756         return 0;
 757 }
 758
 759 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
 760 {
 761         int retval;
 762
 763         if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 764                 return 0;
 765
 766         /*
 767          * If this is the first interface which is added,
 768          * we should load the firmware now.
 769          */
 770         retval = rt2x00lib_load_firmware(rt2x00dev);
 771         if (retval)
 772                 return retval;
 773
 774         /*
 775          * Initialize the device.
 776          */
 777         retval = rt2x00lib_initialize(rt2x00dev);
 778         if (retval)
 779                 return retval;
 780
 781         rt2x00dev->intf_ap_count = 0;
 782         rt2x00dev->intf_sta_count = 0;
 783         rt2x00dev->intf_associated = 0;
 784
 785         set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
 786
 787         return 0;
 788 }
 789
 790 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
 791 {
 792         if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 793                 return;
 794
 795         /*
 796          * Perhaps we can add something smarter here,
 797          * but for now just disabling the radio should do.
 798          */
 799         rt2x00lib_disable_radio(rt2x00dev);
 800
 801         rt2x00dev->intf_ap_count = 0;
 802         rt2x00dev->intf_sta_count = 0;
 803         rt2x00dev->intf_associated = 0;
 804 }
 805
 806 /*
 807  * driver allocation handlers.
 808  */
 809 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 810 {
 811         int retval = -ENOMEM;
 812
 813         mutex_init(&rt2x00dev->csr_mutex);
 814
 815         /*
 816          * Make room for rt2x00_intf inside the per-interface
 817          * structure ieee80211_vif.
 818          */
 819         rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
 820
 821         /*
 822          * Determine which operating modes are supported, all modes
 823          * which require beaconing, depend on the availability of
 824          * beacon entries.
 825          */
 826         rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
 827         if (rt2x00dev->ops->bcn->entry_num > 0)
 828                 rt2x00dev->hw->wiphy->interface_modes |=
 829                     BIT(NL80211_IFTYPE_ADHOC) |
 830                     BIT(NL80211_IFTYPE_AP) |
 831                     BIT(NL80211_IFTYPE_MESH_POINT) |
 832                     BIT(NL80211_IFTYPE_WDS);
 833
 834         /*
 835          * Let the driver probe the device to detect the capabilities.
 836          */
 837         retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
 838         if (retval) {
 839                 ERROR(rt2x00dev, "Failed to allocate device.\n");
 840                 goto exit;
 841         }
 842
 843         /*
 844          * Initialize configuration work.
 845          */
 846         INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
 847         INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
 848
 849         /*
 850          * Allocate queue array.
 851          */
 852         retval = rt2x00queue_allocate(rt2x00dev);
 853         if (retval)
 854                 goto exit;
 855
 856         /*
 857          * Initialize ieee80211 structure.
 858          */
 859         retval = rt2x00lib_probe_hw(rt2x00dev);
 860         if (retval) {
 861                 ERROR(rt2x00dev, "Failed to initialize hw.\n");
 862                 goto exit;
 863         }
 864
 865         /*
 866          * Register extra components.
 867          */
 868         rt2x00link_register(rt2x00dev);
 869         rt2x00leds_register(rt2x00dev);
 870         rt2x00rfkill_allocate(rt2x00dev);
 871         rt2x00debug_register(rt2x00dev);
 872
 873         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 874
 875         return 0;
 876
 877 exit:
 878         rt2x00lib_remove_dev(rt2x00dev);
 879
 880         return retval;
 881 }
 882 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
 883
 884 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
 885 {
 886         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 887
 888         /*
 889          * Disable radio.
 890          */
 891         rt2x00lib_disable_radio(rt2x00dev);
 892
 893         /*
 894          * Uninitialize device.
 895          */
 896         rt2x00lib_uninitialize(rt2x00dev);
 897
 898         /*
 899          * Free extra components
 900          */
 901         rt2x00debug_deregister(rt2x00dev);
 902         rt2x00rfkill_free(rt2x00dev);
 903         rt2x00leds_unregister(rt2x00dev);
 904
 905         /*
 906          * Free ieee80211_hw memory.
 907          */
 908         rt2x00lib_remove_hw(rt2x00dev);
 909
 910         /*
 911          * Free firmware image.
 912          */
 913         rt2x00lib_free_firmware(rt2x00dev);
 914
 915         /*
 916          * Free queue structures.
 917          */
 918         rt2x00queue_free(rt2x00dev);
 919 }
 920 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
 921
 922 /*
 923  * Device state handlers
 924  */
 925 #ifdef CONFIG_PM
 926 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
 927 {
 928         NOTICE(rt2x00dev, "Going to sleep.\n");
 929
 930         /*
 931          * Prevent mac80211 from accessing driver while suspended.
 932          */
 933         if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 934                 return 0;
 935
 936         /*
 937          * Cleanup as much as possible.
 938          */
 939         rt2x00lib_uninitialize(rt2x00dev);
 940
 941         /*
 942          * Suspend/disable extra components.
 943          */
 944         rt2x00leds_suspend(rt2x00dev);
 945         rt2x00debug_deregister(rt2x00dev);
 946
 947         /*
 948          * Set device mode to sleep for power management,
 949          * on some hardware this call seems to consistently fail.
 950          * From the specifications it is hard to tell why it fails,
 951          * and if this is a "bad thing".
 952          * Overall it is safe to just ignore the failure and
 953          * continue suspending. The only downside is that the
 954          * device will not be in optimal power save mode, but with
 955          * the radio and the other components already disabled the
 956          * device is as good as disabled.
 957          */
 958         if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
 959                 WARNING(rt2x00dev, "Device failed to enter sleep state, "
 960                         "continue suspending.\n");
 961
 962         return 0;
 963 }
 964 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
 965
 966 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
 967 {
 968         NOTICE(rt2x00dev, "Waking up.\n");
 969
 970         /*
 971          * Restore/enable extra components.
 972          */
 973         rt2x00debug_register(rt2x00dev);
 974         rt2x00leds_resume(rt2x00dev);
 975
 976         /*
 977          * We are ready again to receive requests from mac80211.
 978          */
 979         set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 980
 981         return 0;
 982 }
 983 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
 984 #endif /* CONFIG_PM */
 985
 986 /*
 987  * rt2x00lib module information.
 988  */
 989 MODULE_AUTHOR(DRV_PROJECT);
 990 MODULE_VERSION(DRV_VERSION);
 991 MODULE_DESCRIPTION("rt2x00 library");
 992 MODULE_LICENSE("GPL");