drivers/net/wireless/libertas_tf/main.c

   1 /*
   2  *  Copyright (C) 2008, cozybit Inc.
   3  *  Copyright (C) 2003-2006, Marvell International Ltd.
   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 (at
   8  *  your option) any later version.
   9  */
  10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/hardirq.h>
  13 #include <linux/slab.h>
  14
  15 #include <linux/etherdevice.h>
  16 #include <linux/module.h>
  17 #include "libertas_tf.h"
  18
  19 #define DRIVER_RELEASE_VERSION "004.p0"
  20 /* thinfirm version: 5.132.X.pX */
  21 #define LBTF_FW_VER_MIN         0x05840300
  22 #define LBTF_FW_VER_MAX         0x0584ffff
  23 #define QOS_CONTROL_LEN         2
  24
  25 /* Module parameters */
  26 unsigned int lbtf_debug;
  27 EXPORT_SYMBOL_GPL(lbtf_debug);
  28 module_param_named(libertas_tf_debug, lbtf_debug, int, 0644);
  29
  30 static const char lbtf_driver_version[] = "THINFIRM-USB8388-" DRIVER_RELEASE_VERSION
  31 #ifdef DEBUG
  32         "-dbg"
  33 #endif
  34         "";
  35
  36 struct workqueue_struct *lbtf_wq;
  37
  38 static const struct ieee80211_channel lbtf_channels[] = {
  39         { .center_freq = 2412, .hw_value = 1 },
  40         { .center_freq = 2417, .hw_value = 2 },
  41         { .center_freq = 2422, .hw_value = 3 },
  42         { .center_freq = 2427, .hw_value = 4 },
  43         { .center_freq = 2432, .hw_value = 5 },
  44         { .center_freq = 2437, .hw_value = 6 },
  45         { .center_freq = 2442, .hw_value = 7 },
  46         { .center_freq = 2447, .hw_value = 8 },
  47         { .center_freq = 2452, .hw_value = 9 },
  48         { .center_freq = 2457, .hw_value = 10 },
  49         { .center_freq = 2462, .hw_value = 11 },
  50         { .center_freq = 2467, .hw_value = 12 },
  51         { .center_freq = 2472, .hw_value = 13 },
  52         { .center_freq = 2484, .hw_value = 14 },
  53 };
  54
  55 /* This table contains the hardware specific values for the modulation rates. */
  56 static const struct ieee80211_rate lbtf_rates[] = {
  57         { .bitrate = 10,
  58           .hw_value = 0, },
  59         { .bitrate = 20,
  60           .hw_value = 1,
  61           .flags = IEEE80211_RATE_SHORT_PREAMBLE },
  62         { .bitrate = 55,
  63           .hw_value = 2,
  64           .flags = IEEE80211_RATE_SHORT_PREAMBLE },
  65         { .bitrate = 110,
  66           .hw_value = 3,
  67           .flags = IEEE80211_RATE_SHORT_PREAMBLE },
  68         { .bitrate = 60,
  69           .hw_value = 5,
  70           .flags = 0 },
  71         { .bitrate = 90,
  72           .hw_value = 6,
  73           .flags = 0 },
  74         { .bitrate = 120,
  75           .hw_value = 7,
  76           .flags = 0 },
  77         { .bitrate = 180,
  78           .hw_value = 8,
  79           .flags = 0 },
  80         { .bitrate = 240,
  81           .hw_value = 9,
  82           .flags = 0 },
  83         { .bitrate = 360,
  84           .hw_value = 10,
  85           .flags = 0 },
  86         { .bitrate = 480,
  87           .hw_value = 11,
  88           .flags = 0 },
  89         { .bitrate = 540,
  90           .hw_value = 12,
  91           .flags = 0 },
  92 };
  93
  94 static void lbtf_cmd_work(struct work_struct *work)
  95 {
  96         struct lbtf_private *priv = container_of(work, struct lbtf_private,
  97                                          cmd_work);
  98
  99         lbtf_deb_enter(LBTF_DEB_CMD);
 100
 101         spin_lock_irq(&priv->driver_lock);
 102         /* command response? */
 103         if (priv->cmd_response_rxed) {
 104                 priv->cmd_response_rxed = 0;
 105                 spin_unlock_irq(&priv->driver_lock);
 106                 lbtf_process_rx_command(priv);
 107                 spin_lock_irq(&priv->driver_lock);
 108         }
 109
 110         if (priv->cmd_timed_out && priv->cur_cmd) {
 111                 struct cmd_ctrl_node *cmdnode = priv->cur_cmd;
 112
 113                 if (++priv->nr_retries > 10) {
 114                         lbtf_complete_command(priv, cmdnode,
 115                                               -ETIMEDOUT);
 116                         priv->nr_retries = 0;
 117                 } else {
 118                         priv->cur_cmd = NULL;
 119
 120                         /* Stick it back at the _top_ of the pending
 121                          * queue for immediate resubmission */
 122                         list_add(&cmdnode->list, &priv->cmdpendingq);
 123                 }
 124         }
 125         priv->cmd_timed_out = 0;
 126         spin_unlock_irq(&priv->driver_lock);
 127
 128         if (!priv->fw_ready) {
 129                 lbtf_deb_leave_args(LBTF_DEB_CMD, "fw not ready");
 130                 return;
 131         }
 132
 133         /* Execute the next command */
 134         if (!priv->cur_cmd)
 135                 lbtf_execute_next_command(priv);
 136
 137         lbtf_deb_leave(LBTF_DEB_CMD);
 138 }
 139
 140 /**
 141  *  lbtf_setup_firmware: initialize firmware.
 142  *
 143  *  @priv    A pointer to struct lbtf_private structure
 144  *
 145  *  Returns: 0 on success.
 146  */
 147 static int lbtf_setup_firmware(struct lbtf_private *priv)
 148 {
 149         int ret = -1;
 150
 151         lbtf_deb_enter(LBTF_DEB_FW);
 152         /*
 153          * Read priv address from HW
 154          */
 155         eth_broadcast_addr(priv->current_addr);
 156         ret = lbtf_update_hw_spec(priv);
 157         if (ret) {
 158                 ret = -1;
 159                 goto done;
 160         }
 161
 162         lbtf_set_mac_control(priv);
 163         lbtf_set_radio_control(priv);
 164
 165         ret = 0;
 166 done:
 167         lbtf_deb_leave_args(LBTF_DEB_FW, "ret: %d", ret);
 168         return ret;
 169 }
 170
 171 /**
 172  *  This function handles the timeout of command sending.
 173  *  It will re-send the same command again.
 174  */
 175 static void command_timer_fn(unsigned long data)
 176 {
 177         struct lbtf_private *priv = (struct lbtf_private *)data;
 178         unsigned long flags;
 179         lbtf_deb_enter(LBTF_DEB_CMD);
 180
 181         spin_lock_irqsave(&priv->driver_lock, flags);
 182
 183         if (!priv->cur_cmd) {
 184                 printk(KERN_DEBUG "libertastf: command timer expired; "
 185                                   "no pending command\n");
 186                 goto out;
 187         }
 188
 189         printk(KERN_DEBUG "libertas: command %x timed out\n",
 190                 le16_to_cpu(priv->cur_cmd->cmdbuf->command));
 191
 192         priv->cmd_timed_out = 1;
 193         queue_work(lbtf_wq, &priv->cmd_work);
 194 out:
 195         spin_unlock_irqrestore(&priv->driver_lock, flags);
 196         lbtf_deb_leave(LBTF_DEB_CMD);
 197 }
 198
 199 static int lbtf_init_adapter(struct lbtf_private *priv)
 200 {
 201         lbtf_deb_enter(LBTF_DEB_MAIN);
 202         eth_broadcast_addr(priv->current_addr);
 203         mutex_init(&priv->lock);
 204
 205         priv->vif = NULL;
 206         setup_timer(&priv->command_timer, command_timer_fn,
 207                 (unsigned long)priv);
 208
 209         INIT_LIST_HEAD(&priv->cmdfreeq);
 210         INIT_LIST_HEAD(&priv->cmdpendingq);
 211
 212         spin_lock_init(&priv->driver_lock);
 213
 214         /* Allocate the command buffers */
 215         if (lbtf_allocate_cmd_buffer(priv))
 216                 return -1;
 217
 218         lbtf_deb_leave(LBTF_DEB_MAIN);
 219         return 0;
 220 }
 221
 222 static void lbtf_free_adapter(struct lbtf_private *priv)
 223 {
 224         lbtf_deb_enter(LBTF_DEB_MAIN);
 225         lbtf_free_cmd_buffer(priv);
 226         del_timer(&priv->command_timer);
 227         lbtf_deb_leave(LBTF_DEB_MAIN);
 228 }
 229
 230 static void lbtf_op_tx(struct ieee80211_hw *hw,
 231                        struct ieee80211_tx_control *control,
 232                        struct sk_buff *skb)
 233 {
 234         struct lbtf_private *priv = hw->priv;
 235
 236         priv->skb_to_tx = skb;
 237         queue_work(lbtf_wq, &priv->tx_work);
 238         /*
 239          * queue will be restarted when we receive transmission feedback if
 240          * there are no buffered multicast frames to send
 241          */
 242         ieee80211_stop_queues(priv->hw);
 243 }
 244
 245 static void lbtf_tx_work(struct work_struct *work)
 246 {
 247         struct lbtf_private *priv = container_of(work, struct lbtf_private,
 248                                          tx_work);
 249         unsigned int len;
 250         struct ieee80211_tx_info *info;
 251         struct txpd *txpd;
 252         struct sk_buff *skb = NULL;
 253         int err;
 254
 255         lbtf_deb_enter(LBTF_DEB_MACOPS | LBTF_DEB_TX);
 256
 257         if ((priv->vif->type == NL80211_IFTYPE_AP) &&
 258             (!skb_queue_empty(&priv->bc_ps_buf)))
 259                 skb = skb_dequeue(&priv->bc_ps_buf);
 260         else if (priv->skb_to_tx) {
 261                 skb = priv->skb_to_tx;
 262                 priv->skb_to_tx = NULL;
 263         } else {
 264                 lbtf_deb_leave(LBTF_DEB_MACOPS | LBTF_DEB_TX);
 265                 return;
 266         }
 267
 268         len = skb->len;
 269         info  = IEEE80211_SKB_CB(skb);
 270         txpd = (struct txpd *)  skb_push(skb, sizeof(struct txpd));
 271
 272         if (priv->surpriseremoved) {
 273                 dev_kfree_skb_any(skb);
 274                 lbtf_deb_leave(LBTF_DEB_MACOPS | LBTF_DEB_TX);
 275                 return;
 276         }
 277
 278         memset(txpd, 0, sizeof(struct txpd));
 279         /* Activate per-packet rate selection */
 280         txpd->tx_control |= cpu_to_le32(MRVL_PER_PACKET_RATE |
 281                              ieee80211_get_tx_rate(priv->hw, info)->hw_value);
 282
 283         /* copy destination address from 802.11 header */
 284         memcpy(txpd->tx_dest_addr_high, skb->data + sizeof(struct txpd) + 4,
 285                 ETH_ALEN);
 286         txpd->tx_packet_length = cpu_to_le16(len);
 287         txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
 288         lbtf_deb_hex(LBTF_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
 289         BUG_ON(priv->tx_skb);
 290         spin_lock_irq(&priv->driver_lock);
 291         priv->tx_skb = skb;
 292         err = priv->hw_host_to_card(priv, MVMS_DAT, skb->data, skb->len);
 293         spin_unlock_irq(&priv->driver_lock);
 294         if (err) {
 295                 dev_kfree_skb_any(skb);
 296                 priv->tx_skb = NULL;
 297                 pr_err("TX error: %d", err);
 298         }
 299         lbtf_deb_leave(LBTF_DEB_MACOPS | LBTF_DEB_TX);
 300 }
 301
 302 static int lbtf_op_start(struct ieee80211_hw *hw)
 303 {
 304         struct lbtf_private *priv = hw->priv;
 305         void *card = priv->card;
 306         int ret = -1;
 307
 308         lbtf_deb_enter(LBTF_DEB_MACOPS);
 309
 310         if (!priv->fw_ready)
 311                 /* Upload firmware */
 312                 if (priv->hw_prog_firmware(card))
 313                         goto err_prog_firmware;
 314
 315         /* poke the firmware */
 316         priv->capability = WLAN_CAPABILITY_SHORT_PREAMBLE;
 317         priv->radioon = RADIO_ON;
 318         priv->mac_control = CMD_ACT_MAC_RX_ON | CMD_ACT_MAC_TX_ON;
 319         ret = lbtf_setup_firmware(priv);
 320         if (ret)
 321                 goto err_prog_firmware;
 322
 323         if ((priv->fwrelease < LBTF_FW_VER_MIN) ||
 324             (priv->fwrelease > LBTF_FW_VER_MAX)) {
 325                 ret = -1;
 326                 goto err_prog_firmware;
 327         }
 328
 329         printk(KERN_INFO "libertastf: Marvell WLAN 802.11 thinfirm adapter\n");
 330         lbtf_deb_leave(LBTF_DEB_MACOPS);
 331         return 0;
 332
 333 err_prog_firmware:
 334         priv->hw_reset_device(card);
 335         lbtf_deb_leave_args(LBTF_DEB_MACOPS, "error programming fw; ret=%d", ret);
 336         return ret;
 337 }
 338
 339 static void lbtf_op_stop(struct ieee80211_hw *hw)
 340 {
 341         struct lbtf_private *priv = hw->priv;
 342         unsigned long flags;
 343         struct sk_buff *skb;
 344
 345         struct cmd_ctrl_node *cmdnode;
 346
 347         lbtf_deb_enter(LBTF_DEB_MACOPS);
 348
 349         /* Flush pending command nodes */
 350         spin_lock_irqsave(&priv->driver_lock, flags);
 351         list_for_each_entry(cmdnode, &priv->cmdpendingq, list) {
 352                 cmdnode->result = -ENOENT;
 353                 cmdnode->cmdwaitqwoken = 1;
 354                 wake_up_interruptible(&cmdnode->cmdwait_q);
 355         }
 356
 357         spin_unlock_irqrestore(&priv->driver_lock, flags);
 358         cancel_work_sync(&priv->cmd_work);
 359         cancel_work_sync(&priv->tx_work);
 360         while ((skb = skb_dequeue(&priv->bc_ps_buf)))
 361                 dev_kfree_skb_any(skb);
 362         priv->radioon = RADIO_OFF;
 363         lbtf_set_radio_control(priv);
 364
 365         lbtf_deb_leave(LBTF_DEB_MACOPS);
 366 }
 367
 368 static int lbtf_op_add_interface(struct ieee80211_hw *hw,
 369                         struct ieee80211_vif *vif)
 370 {
 371         struct lbtf_private *priv = hw->priv;
 372         lbtf_deb_enter(LBTF_DEB_MACOPS);
 373         if (priv->vif != NULL)
 374                 return -EOPNOTSUPP;
 375
 376         priv->vif = vif;
 377         switch (vif->type) {
 378         case NL80211_IFTYPE_MESH_POINT:
 379         case NL80211_IFTYPE_AP:
 380                 lbtf_set_mode(priv, LBTF_AP_MODE);
 381                 break;
 382         case NL80211_IFTYPE_STATION:
 383                 lbtf_set_mode(priv, LBTF_STA_MODE);
 384                 break;
 385         default:
 386                 priv->vif = NULL;
 387                 return -EOPNOTSUPP;
 388         }
 389         lbtf_set_mac_address(priv, (u8 *) vif->addr);
 390         lbtf_deb_leave(LBTF_DEB_MACOPS);
 391         return 0;
 392 }
 393
 394 static void lbtf_op_remove_interface(struct ieee80211_hw *hw,
 395                         struct ieee80211_vif *vif)
 396 {
 397         struct lbtf_private *priv = hw->priv;
 398         lbtf_deb_enter(LBTF_DEB_MACOPS);
 399
 400         if (priv->vif->type == NL80211_IFTYPE_AP ||
 401             priv->vif->type == NL80211_IFTYPE_MESH_POINT)
 402                 lbtf_beacon_ctrl(priv, 0, 0);
 403         lbtf_set_mode(priv, LBTF_PASSIVE_MODE);
 404         lbtf_set_bssid(priv, 0, NULL);
 405         priv->vif = NULL;
 406         lbtf_deb_leave(LBTF_DEB_MACOPS);
 407 }
 408
 409 static int lbtf_op_config(struct ieee80211_hw *hw, u32 changed)
 410 {
 411         struct lbtf_private *priv = hw->priv;
 412         struct ieee80211_conf *conf = &hw->conf;
 413         lbtf_deb_enter(LBTF_DEB_MACOPS);
 414
 415         if (conf->chandef.chan->center_freq != priv->cur_freq) {
 416                 priv->cur_freq = conf->chandef.chan->center_freq;
 417                 lbtf_set_channel(priv, conf->chandef.chan->hw_value);
 418         }
 419         lbtf_deb_leave(LBTF_DEB_MACOPS);
 420         return 0;
 421 }
 422
 423 static u64 lbtf_op_prepare_multicast(struct ieee80211_hw *hw,
 424                                      struct netdev_hw_addr_list *mc_list)
 425 {
 426         struct lbtf_private *priv = hw->priv;
 427         int i;
 428         struct netdev_hw_addr *ha;
 429         int mc_count = netdev_hw_addr_list_count(mc_list);
 430
 431         if (!mc_count || mc_count > MRVDRV_MAX_MULTICAST_LIST_SIZE)
 432                 return mc_count;
 433
 434         priv->nr_of_multicastmacaddr = mc_count;
 435         i = 0;
 436         netdev_hw_addr_list_for_each(ha, mc_list)
 437                 memcpy(&priv->multicastlist[i++], ha->addr, ETH_ALEN);
 438
 439         return mc_count;
 440 }
 441
 442 #define SUPPORTED_FIF_FLAGS  (FIF_PROMISC_IN_BSS | FIF_ALLMULTI)
 443 static void lbtf_op_configure_filter(struct ieee80211_hw *hw,
 444                         unsigned int changed_flags,
 445                         unsigned int *new_flags,
 446                         u64 multicast)
 447 {
 448         struct lbtf_private *priv = hw->priv;
 449         int old_mac_control = priv->mac_control;
 450
 451         lbtf_deb_enter(LBTF_DEB_MACOPS);
 452
 453         changed_flags &= SUPPORTED_FIF_FLAGS;
 454         *new_flags &= SUPPORTED_FIF_FLAGS;
 455
 456         if (!changed_flags) {
 457                 lbtf_deb_leave(LBTF_DEB_MACOPS);
 458                 return;
 459         }
 460
 461         if (*new_flags & (FIF_PROMISC_IN_BSS))
 462                 priv->mac_control |= CMD_ACT_MAC_PROMISCUOUS_ENABLE;
 463         else
 464                 priv->mac_control &= ~CMD_ACT_MAC_PROMISCUOUS_ENABLE;
 465         if (*new_flags & (FIF_ALLMULTI) ||
 466             multicast > MRVDRV_MAX_MULTICAST_LIST_SIZE) {
 467                 priv->mac_control |= CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
 468                 priv->mac_control &= ~CMD_ACT_MAC_MULTICAST_ENABLE;
 469         } else if (multicast) {
 470                 priv->mac_control |= CMD_ACT_MAC_MULTICAST_ENABLE;
 471                 priv->mac_control &= ~CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
 472                 lbtf_cmd_set_mac_multicast_addr(priv);
 473         } else {
 474                 priv->mac_control &= ~(CMD_ACT_MAC_MULTICAST_ENABLE |
 475                                        CMD_ACT_MAC_ALL_MULTICAST_ENABLE);
 476                 if (priv->nr_of_multicastmacaddr) {
 477                         priv->nr_of_multicastmacaddr = 0;
 478                         lbtf_cmd_set_mac_multicast_addr(priv);
 479                 }
 480         }
 481
 482
 483         if (priv->mac_control != old_mac_control)
 484                 lbtf_set_mac_control(priv);
 485
 486         lbtf_deb_leave(LBTF_DEB_MACOPS);
 487 }
 488
 489 static void lbtf_op_bss_info_changed(struct ieee80211_hw *hw,
 490                         struct ieee80211_vif *vif,
 491                         struct ieee80211_bss_conf *bss_conf,
 492                         u32 changes)
 493 {
 494         struct lbtf_private *priv = hw->priv;
 495         struct sk_buff *beacon;
 496         lbtf_deb_enter(LBTF_DEB_MACOPS);
 497
 498         if (changes & (BSS_CHANGED_BEACON | BSS_CHANGED_BEACON_INT)) {
 499                 switch (priv->vif->type) {
 500                 case NL80211_IFTYPE_AP:
 501                 case NL80211_IFTYPE_MESH_POINT:
 502                         beacon = ieee80211_beacon_get(hw, vif);
 503                         if (beacon) {
 504                                 lbtf_beacon_set(priv, beacon);
 505                                 kfree_skb(beacon);
 506                                 lbtf_beacon_ctrl(priv, 1,
 507                                                  bss_conf->beacon_int);
 508                         }
 509                         break;
 510                 default:
 511                         break;
 512                 }
 513         }
 514
 515         if (changes & BSS_CHANGED_BSSID) {
 516                 bool activate = !is_zero_ether_addr(bss_conf->bssid);
 517                 lbtf_set_bssid(priv, activate, bss_conf->bssid);
 518         }
 519
 520         if (changes & BSS_CHANGED_ERP_PREAMBLE) {
 521                 if (bss_conf->use_short_preamble)
 522                         priv->preamble = CMD_TYPE_SHORT_PREAMBLE;
 523                 else
 524                         priv->preamble = CMD_TYPE_LONG_PREAMBLE;
 525                 lbtf_set_radio_control(priv);
 526         }
 527
 528         lbtf_deb_leave(LBTF_DEB_MACOPS);
 529 }
 530
 531 static int lbtf_op_get_survey(struct ieee80211_hw *hw, int idx,
 532                                 struct survey_info *survey)
 533 {
 534         struct lbtf_private *priv = hw->priv;
 535         struct ieee80211_conf *conf = &hw->conf;
 536
 537         if (idx != 0)
 538                 return -ENOENT;
 539
 540         survey->channel = conf->chandef.chan;
 541         survey->filled = SURVEY_INFO_NOISE_DBM;
 542         survey->noise = priv->noise;
 543
 544         return 0;
 545 }
 546
 547 static const struct ieee80211_ops lbtf_ops = {
 548         .tx                     = lbtf_op_tx,
 549         .start                  = lbtf_op_start,
 550         .stop                   = lbtf_op_stop,
 551         .add_interface          = lbtf_op_add_interface,
 552         .remove_interface       = lbtf_op_remove_interface,
 553         .config                 = lbtf_op_config,
 554         .prepare_multicast      = lbtf_op_prepare_multicast,
 555         .configure_filter       = lbtf_op_configure_filter,
 556         .bss_info_changed       = lbtf_op_bss_info_changed,
 557         .get_survey             = lbtf_op_get_survey,
 558 };
 559
 560 int lbtf_rx(struct lbtf_private *priv, struct sk_buff *skb)
 561 {
 562         struct ieee80211_rx_status stats;
 563         struct rxpd *prxpd;
 564         int need_padding;
 565         unsigned int flags;
 566         struct ieee80211_hdr *hdr;
 567
 568         lbtf_deb_enter(LBTF_DEB_RX);
 569
 570         prxpd = (struct rxpd *) skb->data;
 571
 572         memset(&stats, 0, sizeof(stats));
 573         if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK)))
 574                 stats.flag |= RX_FLAG_FAILED_FCS_CRC;
 575         stats.freq = priv->cur_freq;
 576         stats.band = IEEE80211_BAND_2GHZ;
 577         stats.signal = prxpd->snr;
 578         priv->noise = prxpd->nf;
 579         /* Marvell rate index has a hole at value 4 */
 580         if (prxpd->rx_rate > 4)
 581                 --prxpd->rx_rate;
 582         stats.rate_idx = prxpd->rx_rate;
 583         skb_pull(skb, sizeof(struct rxpd));
 584
 585         hdr = (struct ieee80211_hdr *)skb->data;
 586         flags = le32_to_cpu(*(__le32 *)(skb->data + 4));
 587
 588         need_padding = ieee80211_is_data_qos(hdr->frame_control);
 589         need_padding ^= ieee80211_has_a4(hdr->frame_control);
 590         need_padding ^= ieee80211_is_data_qos(hdr->frame_control) &&
 591                         (*ieee80211_get_qos_ctl(hdr) &
 592                          IEEE80211_QOS_CTL_A_MSDU_PRESENT);
 593
 594         if (need_padding) {
 595                 memmove(skb->data + 2, skb->data, skb->len);
 596                 skb_reserve(skb, 2);
 597         }
 598
 599         memcpy(IEEE80211_SKB_RXCB(skb), &stats, sizeof(stats));
 600
 601         lbtf_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
 602                skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
 603         lbtf_deb_hex(LBTF_DEB_RX, "RX Data", skb->data,
 604                      min_t(unsigned int, skb->len, 100));
 605
 606         ieee80211_rx_irqsafe(priv->hw, skb);
 607
 608         lbtf_deb_leave(LBTF_DEB_RX);
 609         return 0;
 610 }
 611 EXPORT_SYMBOL_GPL(lbtf_rx);
 612
 613 /**
 614  * lbtf_add_card: Add and initialize the card, no fw upload yet.
 615  *
 616  *  @card    A pointer to card
 617  *
 618  *  Returns: pointer to struct lbtf_priv.
 619  */
 620 struct lbtf_private *lbtf_add_card(void *card, struct device *dmdev)
 621 {
 622         struct ieee80211_hw *hw;
 623         struct lbtf_private *priv = NULL;
 624
 625         lbtf_deb_enter(LBTF_DEB_MAIN);
 626
 627         hw = ieee80211_alloc_hw(sizeof(struct lbtf_private), &lbtf_ops);
 628         if (!hw)
 629                 goto done;
 630
 631         priv = hw->priv;
 632         if (lbtf_init_adapter(priv))
 633                 goto err_init_adapter;
 634
 635         priv->hw = hw;
 636         priv->card = card;
 637         priv->tx_skb = NULL;
 638
 639         hw->queues = 1;
 640         hw->flags = IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING;
 641         hw->extra_tx_headroom = sizeof(struct txpd);
 642         memcpy(priv->channels, lbtf_channels, sizeof(lbtf_channels));
 643         memcpy(priv->rates, lbtf_rates, sizeof(lbtf_rates));
 644         priv->band.n_bitrates = ARRAY_SIZE(lbtf_rates);
 645         priv->band.bitrates = priv->rates;
 646         priv->band.n_channels = ARRAY_SIZE(lbtf_channels);
 647         priv->band.channels = priv->channels;
 648         hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &priv->band;
 649         hw->wiphy->interface_modes =
 650                 BIT(NL80211_IFTYPE_STATION) |
 651                 BIT(NL80211_IFTYPE_ADHOC);
 652         skb_queue_head_init(&priv->bc_ps_buf);
 653
 654         SET_IEEE80211_DEV(hw, dmdev);
 655
 656         INIT_WORK(&priv->cmd_work, lbtf_cmd_work);
 657         INIT_WORK(&priv->tx_work, lbtf_tx_work);
 658         if (ieee80211_register_hw(hw))
 659                 goto err_init_adapter;
 660
 661         goto done;
 662
 663 err_init_adapter:
 664         lbtf_free_adapter(priv);
 665         ieee80211_free_hw(hw);
 666         priv = NULL;
 667
 668 done:
 669         lbtf_deb_leave_args(LBTF_DEB_MAIN, "priv %p", priv);
 670         return priv;
 671 }
 672 EXPORT_SYMBOL_GPL(lbtf_add_card);
 673
 674
 675 int lbtf_remove_card(struct lbtf_private *priv)
 676 {
 677         struct ieee80211_hw *hw = priv->hw;
 678
 679         lbtf_deb_enter(LBTF_DEB_MAIN);
 680
 681         priv->surpriseremoved = 1;
 682         del_timer(&priv->command_timer);
 683         lbtf_free_adapter(priv);
 684         priv->hw = NULL;
 685         ieee80211_unregister_hw(hw);
 686         ieee80211_free_hw(hw);
 687
 688     lbtf_deb_leave(LBTF_DEB_MAIN);
 689         return 0;
 690 }
 691 EXPORT_SYMBOL_GPL(lbtf_remove_card);
 692
 693 void lbtf_send_tx_feedback(struct lbtf_private *priv, u8 retrycnt, u8 fail)
 694 {
 695         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(priv->tx_skb);
 696
 697         ieee80211_tx_info_clear_status(info);
 698         /*
 699          * Commented out, otherwise we never go beyond 1Mbit/s using mac80211
 700          * default pid rc algorithm.
 701          *
 702          * info->status.retry_count = MRVL_DEFAULT_RETRIES - retrycnt;
 703          */
 704         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) && !fail)
 705                 info->flags |= IEEE80211_TX_STAT_ACK;
 706         skb_pull(priv->tx_skb, sizeof(struct txpd));
 707         ieee80211_tx_status_irqsafe(priv->hw, priv->tx_skb);
 708         priv->tx_skb = NULL;
 709         if (!priv->skb_to_tx && skb_queue_empty(&priv->bc_ps_buf))
 710                 ieee80211_wake_queues(priv->hw);
 711         else
 712                 queue_work(lbtf_wq, &priv->tx_work);
 713 }
 714 EXPORT_SYMBOL_GPL(lbtf_send_tx_feedback);
 715
 716 void lbtf_bcn_sent(struct lbtf_private *priv)
 717 {
 718         struct sk_buff *skb = NULL;
 719
 720         if (priv->vif->type != NL80211_IFTYPE_AP)
 721                 return;
 722
 723         if (skb_queue_empty(&priv->bc_ps_buf)) {
 724                 bool tx_buff_bc = false;
 725
 726                 while ((skb = ieee80211_get_buffered_bc(priv->hw, priv->vif))) {
 727                         skb_queue_tail(&priv->bc_ps_buf, skb);
 728                         tx_buff_bc = true;
 729                 }
 730                 if (tx_buff_bc) {
 731                         ieee80211_stop_queues(priv->hw);
 732                         queue_work(lbtf_wq, &priv->tx_work);
 733                 }
 734         }
 735
 736         skb = ieee80211_beacon_get(priv->hw, priv->vif);
 737
 738         if (skb) {
 739                 lbtf_beacon_set(priv, skb);
 740                 kfree_skb(skb);
 741         }
 742 }
 743 EXPORT_SYMBOL_GPL(lbtf_bcn_sent);
 744
 745 static int __init lbtf_init_module(void)
 746 {
 747         lbtf_deb_enter(LBTF_DEB_MAIN);
 748         lbtf_wq = create_workqueue("libertastf");
 749         if (lbtf_wq == NULL) {
 750                 printk(KERN_ERR "libertastf: couldn't create workqueue\n");
 751                 return -ENOMEM;
 752         }
 753         lbtf_deb_leave(LBTF_DEB_MAIN);
 754         return 0;
 755 }
 756
 757 static void __exit lbtf_exit_module(void)
 758 {
 759         lbtf_deb_enter(LBTF_DEB_MAIN);
 760         destroy_workqueue(lbtf_wq);
 761         lbtf_deb_leave(LBTF_DEB_MAIN);
 762 }
 763
 764 module_init(lbtf_init_module);
 765 module_exit(lbtf_exit_module);
 766
 767 MODULE_DESCRIPTION("Libertas WLAN Thinfirm Driver Library");
 768 MODULE_AUTHOR("Cozybit Inc.");
 769 MODULE_LICENSE("GPL");