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         memset(priv->current_addr, 0xff, ETH_ALEN);
 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         memset(priv->current_addr, 0xff, ETH_ALEN);
 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, struct sk_buff *skb)
 231 {
 232         struct lbtf_private *priv = hw->priv;
 233
 234         priv->skb_to_tx = skb;
 235         queue_work(lbtf_wq, &priv->tx_work);
 236         /*
 237          * queue will be restarted when we receive transmission feedback if
 238          * there are no buffered multicast frames to send
 239          */
 240         ieee80211_stop_queues(priv->hw);
 241 }
 242
 243 static void lbtf_tx_work(struct work_struct *work)
 244 {
 245         struct lbtf_private *priv = container_of(work, struct lbtf_private,
 246                                          tx_work);
 247         unsigned int len;
 248         struct ieee80211_tx_info *info;
 249         struct txpd *txpd;
 250         struct sk_buff *skb = NULL;
 251         int err;
 252
 253         lbtf_deb_enter(LBTF_DEB_MACOPS | LBTF_DEB_TX);
 254
 255         if ((priv->vif->type == NL80211_IFTYPE_AP) &&
 256             (!skb_queue_empty(&priv->bc_ps_buf)))
 257                 skb = skb_dequeue(&priv->bc_ps_buf);
 258         else if (priv->skb_to_tx) {
 259                 skb = priv->skb_to_tx;
 260                 priv->skb_to_tx = NULL;
 261         } else {
 262                 lbtf_deb_leave(LBTF_DEB_MACOPS | LBTF_DEB_TX);
 263                 return;
 264         }
 265
 266         len = skb->len;
 267         info  = IEEE80211_SKB_CB(skb);
 268         txpd = (struct txpd *)  skb_push(skb, sizeof(struct txpd));
 269
 270         if (priv->surpriseremoved) {
 271                 dev_kfree_skb_any(skb);
 272                 lbtf_deb_leave(LBTF_DEB_MACOPS | LBTF_DEB_TX);
 273                 return;
 274         }
 275
 276         memset(txpd, 0, sizeof(struct txpd));
 277         /* Activate per-packet rate selection */
 278         txpd->tx_control |= cpu_to_le32(MRVL_PER_PACKET_RATE |
 279                              ieee80211_get_tx_rate(priv->hw, info)->hw_value);
 280
 281         /* copy destination address from 802.11 header */
 282         memcpy(txpd->tx_dest_addr_high, skb->data + sizeof(struct txpd) + 4,
 283                 ETH_ALEN);
 284         txpd->tx_packet_length = cpu_to_le16(len);
 285         txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
 286         lbtf_deb_hex(LBTF_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
 287         BUG_ON(priv->tx_skb);
 288         spin_lock_irq(&priv->driver_lock);
 289         priv->tx_skb = skb;
 290         err = priv->hw_host_to_card(priv, MVMS_DAT, skb->data, skb->len);
 291         spin_unlock_irq(&priv->driver_lock);
 292         if (err) {
 293                 dev_kfree_skb_any(skb);
 294                 priv->tx_skb = NULL;
 295                 pr_err("TX error: %d", err);
 296         }
 297         lbtf_deb_leave(LBTF_DEB_MACOPS | LBTF_DEB_TX);
 298 }
 299
 300 static int lbtf_op_start(struct ieee80211_hw *hw)
 301 {
 302         struct lbtf_private *priv = hw->priv;
 303         void *card = priv->card;
 304         int ret = -1;
 305
 306         lbtf_deb_enter(LBTF_DEB_MACOPS);
 307
 308         if (!priv->fw_ready)
 309                 /* Upload firmware */
 310                 if (priv->hw_prog_firmware(card))
 311                         goto err_prog_firmware;
 312
 313         /* poke the firmware */
 314         priv->capability = WLAN_CAPABILITY_SHORT_PREAMBLE;
 315         priv->radioon = RADIO_ON;
 316         priv->mac_control = CMD_ACT_MAC_RX_ON | CMD_ACT_MAC_TX_ON;
 317         ret = lbtf_setup_firmware(priv);
 318         if (ret)
 319                 goto err_prog_firmware;
 320
 321         if ((priv->fwrelease < LBTF_FW_VER_MIN) ||
 322             (priv->fwrelease > LBTF_FW_VER_MAX)) {
 323                 ret = -1;
 324                 goto err_prog_firmware;
 325         }
 326
 327         printk(KERN_INFO "libertastf: Marvell WLAN 802.11 thinfirm adapter\n");
 328         lbtf_deb_leave(LBTF_DEB_MACOPS);
 329         return 0;
 330
 331 err_prog_firmware:
 332         priv->hw_reset_device(card);
 333         lbtf_deb_leave_args(LBTF_DEB_MACOPS, "error programing fw; ret=%d", ret);
 334         return ret;
 335 }
 336
 337 static void lbtf_op_stop(struct ieee80211_hw *hw)
 338 {
 339         struct lbtf_private *priv = hw->priv;
 340         unsigned long flags;
 341         struct sk_buff *skb;
 342
 343         struct cmd_ctrl_node *cmdnode;
 344
 345         lbtf_deb_enter(LBTF_DEB_MACOPS);
 346
 347         /* Flush pending command nodes */
 348         spin_lock_irqsave(&priv->driver_lock, flags);
 349         list_for_each_entry(cmdnode, &priv->cmdpendingq, list) {
 350                 cmdnode->result = -ENOENT;
 351                 cmdnode->cmdwaitqwoken = 1;
 352                 wake_up_interruptible(&cmdnode->cmdwait_q);
 353         }
 354
 355         spin_unlock_irqrestore(&priv->driver_lock, flags);
 356         cancel_work_sync(&priv->cmd_work);
 357         cancel_work_sync(&priv->tx_work);
 358         while ((skb = skb_dequeue(&priv->bc_ps_buf)))
 359                 dev_kfree_skb_any(skb);
 360         priv->radioon = RADIO_OFF;
 361         lbtf_set_radio_control(priv);
 362
 363         lbtf_deb_leave(LBTF_DEB_MACOPS);
 364 }
 365
 366 static int lbtf_op_add_interface(struct ieee80211_hw *hw,
 367                         struct ieee80211_vif *vif)
 368 {
 369         struct lbtf_private *priv = hw->priv;
 370         lbtf_deb_enter(LBTF_DEB_MACOPS);
 371         if (priv->vif != NULL)
 372                 return -EOPNOTSUPP;
 373
 374         priv->vif = vif;
 375         switch (vif->type) {
 376         case NL80211_IFTYPE_MESH_POINT:
 377         case NL80211_IFTYPE_AP:
 378                 lbtf_set_mode(priv, LBTF_AP_MODE);
 379                 break;
 380         case NL80211_IFTYPE_STATION:
 381                 lbtf_set_mode(priv, LBTF_STA_MODE);
 382                 break;
 383         default:
 384                 priv->vif = NULL;
 385                 return -EOPNOTSUPP;
 386         }
 387         lbtf_set_mac_address(priv, (u8 *) vif->addr);
 388         lbtf_deb_leave(LBTF_DEB_MACOPS);
 389         return 0;
 390 }
 391
 392 static void lbtf_op_remove_interface(struct ieee80211_hw *hw,
 393                         struct ieee80211_vif *vif)
 394 {
 395         struct lbtf_private *priv = hw->priv;
 396         lbtf_deb_enter(LBTF_DEB_MACOPS);
 397
 398         if (priv->vif->type == NL80211_IFTYPE_AP ||
 399             priv->vif->type == NL80211_IFTYPE_MESH_POINT)
 400                 lbtf_beacon_ctrl(priv, 0, 0);
 401         lbtf_set_mode(priv, LBTF_PASSIVE_MODE);
 402         lbtf_set_bssid(priv, 0, NULL);
 403         priv->vif = NULL;
 404         lbtf_deb_leave(LBTF_DEB_MACOPS);
 405 }
 406
 407 static int lbtf_op_config(struct ieee80211_hw *hw, u32 changed)
 408 {
 409         struct lbtf_private *priv = hw->priv;
 410         struct ieee80211_conf *conf = &hw->conf;
 411         lbtf_deb_enter(LBTF_DEB_MACOPS);
 412
 413         if (conf->channel->center_freq != priv->cur_freq) {
 414                 priv->cur_freq = conf->channel->center_freq;
 415                 lbtf_set_channel(priv, conf->channel->hw_value);
 416         }
 417         lbtf_deb_leave(LBTF_DEB_MACOPS);
 418         return 0;
 419 }
 420
 421 static u64 lbtf_op_prepare_multicast(struct ieee80211_hw *hw,
 422                                      struct netdev_hw_addr_list *mc_list)
 423 {
 424         struct lbtf_private *priv = hw->priv;
 425         int i;
 426         struct netdev_hw_addr *ha;
 427         int mc_count = netdev_hw_addr_list_count(mc_list);
 428
 429         if (!mc_count || mc_count > MRVDRV_MAX_MULTICAST_LIST_SIZE)
 430                 return mc_count;
 431
 432         priv->nr_of_multicastmacaddr = mc_count;
 433         i = 0;
 434         netdev_hw_addr_list_for_each(ha, mc_list)
 435                 memcpy(&priv->multicastlist[i++], ha->addr, ETH_ALEN);
 436
 437         return mc_count;
 438 }
 439
 440 #define SUPPORTED_FIF_FLAGS  (FIF_PROMISC_IN_BSS | FIF_ALLMULTI)
 441 static void lbtf_op_configure_filter(struct ieee80211_hw *hw,
 442                         unsigned int changed_flags,
 443                         unsigned int *new_flags,
 444                         u64 multicast)
 445 {
 446         struct lbtf_private *priv = hw->priv;
 447         int old_mac_control = priv->mac_control;
 448
 449         lbtf_deb_enter(LBTF_DEB_MACOPS);
 450
 451         changed_flags &= SUPPORTED_FIF_FLAGS;
 452         *new_flags &= SUPPORTED_FIF_FLAGS;
 453
 454         if (!changed_flags) {
 455                 lbtf_deb_leave(LBTF_DEB_MACOPS);
 456                 return;
 457         }
 458
 459         if (*new_flags & (FIF_PROMISC_IN_BSS))
 460                 priv->mac_control |= CMD_ACT_MAC_PROMISCUOUS_ENABLE;
 461         else
 462                 priv->mac_control &= ~CMD_ACT_MAC_PROMISCUOUS_ENABLE;
 463         if (*new_flags & (FIF_ALLMULTI) ||
 464             multicast > MRVDRV_MAX_MULTICAST_LIST_SIZE) {
 465                 priv->mac_control |= CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
 466                 priv->mac_control &= ~CMD_ACT_MAC_MULTICAST_ENABLE;
 467         } else if (multicast) {
 468                 priv->mac_control |= CMD_ACT_MAC_MULTICAST_ENABLE;
 469                 priv->mac_control &= ~CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
 470                 lbtf_cmd_set_mac_multicast_addr(priv);
 471         } else {
 472                 priv->mac_control &= ~(CMD_ACT_MAC_MULTICAST_ENABLE |
 473                                        CMD_ACT_MAC_ALL_MULTICAST_ENABLE);
 474                 if (priv->nr_of_multicastmacaddr) {
 475                         priv->nr_of_multicastmacaddr = 0;
 476                         lbtf_cmd_set_mac_multicast_addr(priv);
 477                 }
 478         }
 479
 480
 481         if (priv->mac_control != old_mac_control)
 482                 lbtf_set_mac_control(priv);
 483
 484         lbtf_deb_leave(LBTF_DEB_MACOPS);
 485 }
 486
 487 static void lbtf_op_bss_info_changed(struct ieee80211_hw *hw,
 488                         struct ieee80211_vif *vif,
 489                         struct ieee80211_bss_conf *bss_conf,
 490                         u32 changes)
 491 {
 492         struct lbtf_private *priv = hw->priv;
 493         struct sk_buff *beacon;
 494         lbtf_deb_enter(LBTF_DEB_MACOPS);
 495
 496         if (changes & (BSS_CHANGED_BEACON | BSS_CHANGED_BEACON_INT)) {
 497                 switch (priv->vif->type) {
 498                 case NL80211_IFTYPE_AP:
 499                 case NL80211_IFTYPE_MESH_POINT:
 500                         beacon = ieee80211_beacon_get(hw, vif);
 501                         if (beacon) {
 502                                 lbtf_beacon_set(priv, beacon);
 503                                 kfree_skb(beacon);
 504                                 lbtf_beacon_ctrl(priv, 1,
 505                                                  bss_conf->beacon_int);
 506                         }
 507                         break;
 508                 default:
 509                         break;
 510                 }
 511         }
 512
 513         if (changes & BSS_CHANGED_BSSID) {
 514                 bool activate = !is_zero_ether_addr(bss_conf->bssid);
 515                 lbtf_set_bssid(priv, activate, bss_conf->bssid);
 516         }
 517
 518         if (changes & BSS_CHANGED_ERP_PREAMBLE) {
 519                 if (bss_conf->use_short_preamble)
 520                         priv->preamble = CMD_TYPE_SHORT_PREAMBLE;
 521                 else
 522                         priv->preamble = CMD_TYPE_LONG_PREAMBLE;
 523                 lbtf_set_radio_control(priv);
 524         }
 525
 526         lbtf_deb_leave(LBTF_DEB_MACOPS);
 527 }
 528
 529 static int lbtf_op_get_survey(struct ieee80211_hw *hw, int idx,
 530                                 struct survey_info *survey)
 531 {
 532         struct lbtf_private *priv = hw->priv;
 533         struct ieee80211_conf *conf = &hw->conf;
 534
 535         if (idx != 0)
 536                 return -ENOENT;
 537
 538         survey->channel = conf->channel;
 539         survey->filled = SURVEY_INFO_NOISE_DBM;
 540         survey->noise = priv->noise;
 541
 542         return 0;
 543 }
 544
 545 static const struct ieee80211_ops lbtf_ops = {
 546         .tx                     = lbtf_op_tx,
 547         .start                  = lbtf_op_start,
 548         .stop                   = lbtf_op_stop,
 549         .add_interface          = lbtf_op_add_interface,
 550         .remove_interface       = lbtf_op_remove_interface,
 551         .config                 = lbtf_op_config,
 552         .prepare_multicast      = lbtf_op_prepare_multicast,
 553         .configure_filter       = lbtf_op_configure_filter,
 554         .bss_info_changed       = lbtf_op_bss_info_changed,
 555         .get_survey             = lbtf_op_get_survey,
 556 };
 557
 558 int lbtf_rx(struct lbtf_private *priv, struct sk_buff *skb)
 559 {
 560         struct ieee80211_rx_status stats;
 561         struct rxpd *prxpd;
 562         int need_padding;
 563         unsigned int flags;
 564         struct ieee80211_hdr *hdr;
 565
 566         lbtf_deb_enter(LBTF_DEB_RX);
 567
 568         prxpd = (struct rxpd *) skb->data;
 569
 570         memset(&stats, 0, sizeof(stats));
 571         if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK)))
 572                 stats.flag |= RX_FLAG_FAILED_FCS_CRC;
 573         stats.freq = priv->cur_freq;
 574         stats.band = IEEE80211_BAND_2GHZ;
 575         stats.signal = prxpd->snr;
 576         priv->noise = prxpd->nf;
 577         /* Marvell rate index has a hole at value 4 */
 578         if (prxpd->rx_rate > 4)
 579                 --prxpd->rx_rate;
 580         stats.rate_idx = prxpd->rx_rate;
 581         skb_pull(skb, sizeof(struct rxpd));
 582
 583         hdr = (struct ieee80211_hdr *)skb->data;
 584         flags = le32_to_cpu(*(__le32 *)(skb->data + 4));
 585
 586         need_padding = ieee80211_is_data_qos(hdr->frame_control);
 587         need_padding ^= ieee80211_has_a4(hdr->frame_control);
 588         need_padding ^= ieee80211_is_data_qos(hdr->frame_control) &&
 589                         (*ieee80211_get_qos_ctl(hdr) &
 590                          IEEE80211_QOS_CTL_A_MSDU_PRESENT);
 591
 592         if (need_padding) {
 593                 memmove(skb->data + 2, skb->data, skb->len);
 594                 skb_reserve(skb, 2);
 595         }
 596
 597         memcpy(IEEE80211_SKB_RXCB(skb), &stats, sizeof(stats));
 598
 599         lbtf_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
 600                skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
 601         lbtf_deb_hex(LBTF_DEB_RX, "RX Data", skb->data,
 602                      min_t(unsigned int, skb->len, 100));
 603
 604         ieee80211_rx_irqsafe(priv->hw, skb);
 605
 606         lbtf_deb_leave(LBTF_DEB_RX);
 607         return 0;
 608 }
 609 EXPORT_SYMBOL_GPL(lbtf_rx);
 610
 611 /**
 612  * lbtf_add_card: Add and initialize the card, no fw upload yet.
 613  *
 614  *  @card    A pointer to card
 615  *
 616  *  Returns: pointer to struct lbtf_priv.
 617  */
 618 struct lbtf_private *lbtf_add_card(void *card, struct device *dmdev)
 619 {
 620         struct ieee80211_hw *hw;
 621         struct lbtf_private *priv = NULL;
 622
 623         lbtf_deb_enter(LBTF_DEB_MAIN);
 624
 625         hw = ieee80211_alloc_hw(sizeof(struct lbtf_private), &lbtf_ops);
 626         if (!hw)
 627                 goto done;
 628
 629         priv = hw->priv;
 630         if (lbtf_init_adapter(priv))
 631                 goto err_init_adapter;
 632
 633         priv->hw = hw;
 634         priv->card = card;
 635         priv->tx_skb = NULL;
 636
 637         hw->queues = 1;
 638         hw->flags = IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING;
 639         hw->extra_tx_headroom = sizeof(struct txpd);
 640         memcpy(priv->channels, lbtf_channels, sizeof(lbtf_channels));
 641         memcpy(priv->rates, lbtf_rates, sizeof(lbtf_rates));
 642         priv->band.n_bitrates = ARRAY_SIZE(lbtf_rates);
 643         priv->band.bitrates = priv->rates;
 644         priv->band.n_channels = ARRAY_SIZE(lbtf_channels);
 645         priv->band.channels = priv->channels;
 646         hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &priv->band;
 647         hw->wiphy->interface_modes =
 648                 BIT(NL80211_IFTYPE_STATION) |
 649                 BIT(NL80211_IFTYPE_ADHOC);
 650         skb_queue_head_init(&priv->bc_ps_buf);
 651
 652         SET_IEEE80211_DEV(hw, dmdev);
 653
 654         INIT_WORK(&priv->cmd_work, lbtf_cmd_work);
 655         INIT_WORK(&priv->tx_work, lbtf_tx_work);
 656         if (ieee80211_register_hw(hw))
 657                 goto err_init_adapter;
 658
 659         goto done;
 660
 661 err_init_adapter:
 662         lbtf_free_adapter(priv);
 663         ieee80211_free_hw(hw);
 664         priv = NULL;
 665
 666 done:
 667         lbtf_deb_leave_args(LBTF_DEB_MAIN, "priv %p", priv);
 668         return priv;
 669 }
 670 EXPORT_SYMBOL_GPL(lbtf_add_card);
 671
 672
 673 int lbtf_remove_card(struct lbtf_private *priv)
 674 {
 675         struct ieee80211_hw *hw = priv->hw;
 676
 677         lbtf_deb_enter(LBTF_DEB_MAIN);
 678
 679         priv->surpriseremoved = 1;
 680         del_timer(&priv->command_timer);
 681         lbtf_free_adapter(priv);
 682         priv->hw = NULL;
 683         ieee80211_unregister_hw(hw);
 684         ieee80211_free_hw(hw);
 685
 686     lbtf_deb_leave(LBTF_DEB_MAIN);
 687         return 0;
 688 }
 689 EXPORT_SYMBOL_GPL(lbtf_remove_card);
 690
 691 void lbtf_send_tx_feedback(struct lbtf_private *priv, u8 retrycnt, u8 fail)
 692 {
 693         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(priv->tx_skb);
 694
 695         ieee80211_tx_info_clear_status(info);
 696         /*
 697          * Commented out, otherwise we never go beyond 1Mbit/s using mac80211
 698          * default pid rc algorithm.
 699          *
 700          * info->status.retry_count = MRVL_DEFAULT_RETRIES - retrycnt;
 701          */
 702         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) && !fail)
 703                 info->flags |= IEEE80211_TX_STAT_ACK;
 704         skb_pull(priv->tx_skb, sizeof(struct txpd));
 705         ieee80211_tx_status_irqsafe(priv->hw, priv->tx_skb);
 706         priv->tx_skb = NULL;
 707         if (!priv->skb_to_tx && skb_queue_empty(&priv->bc_ps_buf))
 708                 ieee80211_wake_queues(priv->hw);
 709         else
 710                 queue_work(lbtf_wq, &priv->tx_work);
 711 }
 712 EXPORT_SYMBOL_GPL(lbtf_send_tx_feedback);
 713
 714 void lbtf_bcn_sent(struct lbtf_private *priv)
 715 {
 716         struct sk_buff *skb = NULL;
 717
 718         if (priv->vif->type != NL80211_IFTYPE_AP)
 719                 return;
 720
 721         if (skb_queue_empty(&priv->bc_ps_buf)) {
 722                 bool tx_buff_bc = false;
 723
 724                 while ((skb = ieee80211_get_buffered_bc(priv->hw, priv->vif))) {
 725                         skb_queue_tail(&priv->bc_ps_buf, skb);
 726                         tx_buff_bc = true;
 727                 }
 728                 if (tx_buff_bc) {
 729                         ieee80211_stop_queues(priv->hw);
 730                         queue_work(lbtf_wq, &priv->tx_work);
 731                 }
 732         }
 733
 734         skb = ieee80211_beacon_get(priv->hw, priv->vif);
 735
 736         if (skb) {
 737                 lbtf_beacon_set(priv, skb);
 738                 kfree_skb(skb);
 739         }
 740 }
 741 EXPORT_SYMBOL_GPL(lbtf_bcn_sent);
 742
 743 static int __init lbtf_init_module(void)
 744 {
 745         lbtf_deb_enter(LBTF_DEB_MAIN);
 746         lbtf_wq = create_workqueue("libertastf");
 747         if (lbtf_wq == NULL) {
 748                 printk(KERN_ERR "libertastf: couldn't create workqueue\n");
 749                 return -ENOMEM;
 750         }
 751         lbtf_deb_leave(LBTF_DEB_MAIN);
 752         return 0;
 753 }
 754
 755 static void __exit lbtf_exit_module(void)
 756 {
 757         lbtf_deb_enter(LBTF_DEB_MAIN);
 758         destroy_workqueue(lbtf_wq);
 759         lbtf_deb_leave(LBTF_DEB_MAIN);
 760 }
 761
 762 module_init(lbtf_init_module);
 763 module_exit(lbtf_exit_module);
 764
 765 MODULE_DESCRIPTION("Libertas WLAN Thinfirm Driver Library");
 766 MODULE_AUTHOR("Cozybit Inc.");
 767 MODULE_LICENSE("GPL");