libertas_tf: main.c, data paths and mac80211 handlers

This patch contains most of the libertastf driver, just lacking command helper
functions and usb specific functions. Currently, monitor, managed, ap and mesh
interfaces are supported. Even though this driver supports the same hardware as
the "libertas" driver, it uses a different (thin) firmware, that makes it
suitable for a mac80211 driver.

Signed-off-by: Luis Carlos Cobo <luisca@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 666 insertions, 0 deletions

diff --git a/drivers/net/wireless/libertas_tf/main.c b/drivers/net/wireless/libertas_tf/main.c
new file mode 100644
index 00000000000..2c1d680d2c5
--- /dev/null
+++ b/drivers/net/wireless/libertas_tf/main.c
@@ -0,0 +1,666 @@
+/*
+ *  Copyright (C) 2008, cozybit Inc.
+ *  Copyright (C) 2003-2006, Marvell International Ltd.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or (at
+ *  your option) any later version.
+ */
+#include "libertas_tf.h"
+#include "linux/etherdevice.h"
+
+#define DRIVER_RELEASE_VERSION "004.p0"
+/* thinfirm version: 5.132.X.pX */
+#define LBTF_FW_VER_MIN         0x05840300
+#define LBTF_FW_VER_MAX         0x0584ffff
+#define QOS_CONTROL_LEN         2
+
+static const char lbtf_driver_version[] = "THINFIRM-USB8388-" DRIVER_RELEASE_VERSION;
+struct workqueue_struct *lbtf_wq;
+
+static const struct ieee80211_channel lbtf_channels[] = {
+        { .center_freq = 2412, .hw_value = 1 },
+        { .center_freq = 2417, .hw_value = 2 },
+        { .center_freq = 2422, .hw_value = 3 },
+        { .center_freq = 2427, .hw_value = 4 },
+        { .center_freq = 2432, .hw_value = 5 },
+        { .center_freq = 2437, .hw_value = 6 },
+        { .center_freq = 2442, .hw_value = 7 },
+        { .center_freq = 2447, .hw_value = 8 },
+        { .center_freq = 2452, .hw_value = 9 },
+        { .center_freq = 2457, .hw_value = 10 },
+        { .center_freq = 2462, .hw_value = 11 },
+        { .center_freq = 2467, .hw_value = 12 },
+        { .center_freq = 2472, .hw_value = 13 },
+        { .center_freq = 2484, .hw_value = 14 },
+};
+
+/* This table contains the hardware specific values for the modulation rates. */
+static const struct ieee80211_rate lbtf_rates[] = {
+        { .bitrate = 10,
+          .hw_value = 0, },
+        { .bitrate = 20,
+          .hw_value = 1,
+          .flags = IEEE80211_RATE_SHORT_PREAMBLE },
+        { .bitrate = 55,
+          .hw_value = 2,
+          .flags = IEEE80211_RATE_SHORT_PREAMBLE },
+        { .bitrate = 110,
+          .hw_value = 3,
+          .flags = IEEE80211_RATE_SHORT_PREAMBLE },
+        { .bitrate = 60,
+          .hw_value = 5,
+          .flags = 0 },
+        { .bitrate = 90,
+          .hw_value = 6,
+          .flags = 0 },
+        { .bitrate = 120,
+          .hw_value = 7,
+          .flags = 0 },
+        { .bitrate = 180,
+          .hw_value = 8,
+          .flags = 0 },
+        { .bitrate = 240,
+          .hw_value = 9,
+          .flags = 0 },
+        { .bitrate = 360,
+          .hw_value = 10,
+          .flags = 0 },
+        { .bitrate = 480,
+          .hw_value = 11,
+          .flags = 0 },
+        { .bitrate = 540,
+          .hw_value = 12,
+          .flags = 0 },
+};
+
+static void lbtf_cmd_work(struct work_struct *work)
+{
+        struct lbtf_private *priv = container_of(work, struct lbtf_private,
+                                         cmd_work);
+        spin_lock_irq(&priv->driver_lock);
+        /* command response? */
+        if (priv->cmd_response_rxed) {
+                priv->cmd_response_rxed = 0;
+                spin_unlock_irq(&priv->driver_lock);
+                lbtf_process_rx_command(priv);
+                spin_lock_irq(&priv->driver_lock);
+        }
+
+        if (priv->cmd_timed_out && priv->cur_cmd) {
+                struct cmd_ctrl_node *cmdnode = priv->cur_cmd;
+
+                if (++priv->nr_retries > 10) {
+                        lbtf_complete_command(priv, cmdnode,
+                                              -ETIMEDOUT);
+                        priv->nr_retries = 0;
+                } else {
+                        priv->cur_cmd = NULL;
+
+                        /* Stick it back at the _top_ of the pending
+                         * queue for immediate resubmission */
+                        list_add(&cmdnode->list, &priv->cmdpendingq);
+                }
+        }
+        priv->cmd_timed_out = 0;
+        spin_unlock_irq(&priv->driver_lock);
+
+        if (!priv->fw_ready)
+                return;
+        /* Execute the next command */
+        if (!priv->cur_cmd)
+                lbtf_execute_next_command(priv);
+}
+
+/**
+ *  lbtf_setup_firmware: initialize firmware.
+ *
+ *  @priv    A pointer to struct lbtf_private structure
+ *
+ *  Returns: 0 on success.
+ */
+static int lbtf_setup_firmware(struct lbtf_private *priv)
+{
+        int ret = -1;
+
+        /*
+         * Read priv address from HW
+         */
+        memset(priv->current_addr, 0xff, ETH_ALEN);
+        ret = lbtf_update_hw_spec(priv);
+        if (ret) {
+                ret = -1;
+                goto done;
+        }
+
+        lbtf_set_mac_control(priv);
+        lbtf_set_radio_control(priv);
+
+        ret = 0;
+done:
+        return ret;
+}
+
+/**
+ *  This function handles the timeout of command sending.
+ *  It will re-send the same command again.
+ */
+static void command_timer_fn(unsigned long data)
+{
+        struct lbtf_private *priv = (struct lbtf_private *)data;
+        unsigned long flags;
+
+        spin_lock_irqsave(&priv->driver_lock, flags);
+
+        if (!priv->cur_cmd) {
+                printk(KERN_DEBUG "libertastf: command timer expired; "
+                                  "no pending command\n");
+                goto out;
+        }
+
+        printk(KERN_DEBUG "libertas: command %x timed out\n",
+                le16_to_cpu(priv->cur_cmd->cmdbuf->command));
+
+        priv->cmd_timed_out = 1;
+        queue_work(lbtf_wq, &priv->cmd_work);
+out:
+        spin_unlock_irqrestore(&priv->driver_lock, flags);
+}
+
+static int lbtf_init_adapter(struct lbtf_private *priv)
+{
+        memset(priv->current_addr, 0xff, ETH_ALEN);
+        mutex_init(&priv->lock);
+
+        priv->vif = NULL;
+        setup_timer(&priv->command_timer, command_timer_fn,
+                (unsigned long)priv);
+
+        INIT_LIST_HEAD(&priv->cmdfreeq);
+        INIT_LIST_HEAD(&priv->cmdpendingq);
+
+        spin_lock_init(&priv->driver_lock);
+
+        /* Allocate the command buffers */
+        if (lbtf_allocate_cmd_buffer(priv))
+                return -1;
+
+        return 0;
+}
+
+static void lbtf_free_adapter(struct lbtf_private *priv)
+{
+        lbtf_free_cmd_buffer(priv);
+        del_timer(&priv->command_timer);
+}
+
+static int lbtf_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
+{
+        struct lbtf_private *priv = hw->priv;
+
+        priv->skb_to_tx = skb;
+        queue_work(lbtf_wq, &priv->tx_work);
+        /*
+         * queue will be restarted when we receive transmission feedback if
+         * there are no buffered multicast frames to send
+         */
+        ieee80211_stop_queues(priv->hw);
+        return 0;
+}
+
+static void lbtf_tx_work(struct work_struct *work)
+{
+        struct lbtf_private *priv = container_of(work, struct lbtf_private,
+                                         tx_work);
+        unsigned int len;
+        struct ieee80211_tx_info *info;
+        struct txpd *txpd;
+        struct sk_buff *skb = NULL;
+        int err;
+
+        if ((priv->vif->type == IEEE80211_IF_TYPE_AP) &&
+            (!skb_queue_empty(&priv->bc_ps_buf)))
+                skb = skb_dequeue(&priv->bc_ps_buf);
+        else if (priv->skb_to_tx) {
+                skb = priv->skb_to_tx;
+                priv->skb_to_tx = NULL;
+        } else
+                return;
+
+        len = skb->len;
+        info  = IEEE80211_SKB_CB(skb);
+        txpd = (struct txpd *)  skb_push(skb, sizeof(struct txpd));
+
+        if (priv->surpriseremoved) {
+                dev_kfree_skb_any(skb);
+                return;
+        }
+
+        memset(txpd, 0, sizeof(struct txpd));
+        /* Activate per-packet rate selection */
+        txpd->tx_control |= cpu_to_le32(MRVL_PER_PACKET_RATE |
+                             ieee80211_get_tx_rate(priv->hw, info)->hw_value);
+
+        /* copy destination address from 802.11 header */
+        memcpy(txpd->tx_dest_addr_high, skb->data + sizeof(struct txpd) + 4,
+                ETH_ALEN);
+        txpd->tx_packet_length = cpu_to_le16(len);
+        txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
+        BUG_ON(priv->tx_skb);
+        spin_lock_irq(&priv->driver_lock);
+        priv->tx_skb = skb;
+        err = priv->hw_host_to_card(priv, MVMS_DAT, skb->data, skb->len);
+        spin_unlock_irq(&priv->driver_lock);
+        if (err) {
+                dev_kfree_skb_any(skb);
+                priv->tx_skb = NULL;
+        }
+}
+
+static int lbtf_op_start(struct ieee80211_hw *hw)
+{
+        struct lbtf_private *priv = hw->priv;
+        void *card = priv->card;
+        int ret = -1;
+
+        if (!priv->fw_ready)
+                /* Upload firmware */
+                if (priv->hw_prog_firmware(card))
+                        goto err_prog_firmware;
+
+        /* poke the firmware */
+        priv->capability = WLAN_CAPABILITY_SHORT_PREAMBLE;
+        priv->radioon = RADIO_ON;
+        priv->mac_control = CMD_ACT_MAC_RX_ON | CMD_ACT_MAC_TX_ON;
+        ret = lbtf_setup_firmware(priv);
+        if (ret)
+                goto err_prog_firmware;
+
+        if ((priv->fwrelease < LBTF_FW_VER_MIN) ||
+            (priv->fwrelease > LBTF_FW_VER_MAX)) {
+                ret = -1;
+                goto err_prog_firmware;
+        }
+
+        printk(KERN_INFO "libertastf: Marvell WLAN 802.11 thinfirm adapter\n");
+        return 0;
+
+err_prog_firmware:
+        priv->hw_reset_device(card);
+        return ret;
+}
+
+static void lbtf_op_stop(struct ieee80211_hw *hw)
+{
+        struct lbtf_private *priv = hw->priv;
+        unsigned long flags;
+        struct sk_buff *skb;
+
+        struct cmd_ctrl_node *cmdnode;
+        /* Flush pending command nodes */
+        spin_lock_irqsave(&priv->driver_lock, flags);
+        list_for_each_entry(cmdnode, &priv->cmdpendingq, list) {
+                cmdnode->result = -ENOENT;
+                cmdnode->cmdwaitqwoken = 1;
+                wake_up_interruptible(&cmdnode->cmdwait_q);
+        }
+
+        spin_unlock_irqrestore(&priv->driver_lock, flags);
+        cancel_work_sync(&priv->cmd_work);
+        cancel_work_sync(&priv->tx_work);
+        while ((skb = skb_dequeue(&priv->bc_ps_buf)))
+                dev_kfree_skb_any(skb);
+        priv->radioon = RADIO_OFF;
+        lbtf_set_radio_control(priv);
+
+        return;
+}
+
+static int lbtf_op_add_interface(struct ieee80211_hw *hw,
+                        struct ieee80211_if_init_conf *conf)
+{
+        struct lbtf_private *priv = hw->priv;
+        if (priv->vif != NULL)
+                return -EOPNOTSUPP;
+
+        priv->vif = conf->vif;
+        switch (conf->type) {
+        case IEEE80211_IF_TYPE_MESH_POINT:
+        case IEEE80211_IF_TYPE_AP:
+                lbtf_set_mode(priv, LBTF_AP_MODE);
+                break;
+        case IEEE80211_IF_TYPE_STA:
+                lbtf_set_mode(priv, LBTF_STA_MODE);
+                break;
+        default:
+                priv->vif = NULL;
+                return -EOPNOTSUPP;
+        }
+        lbtf_set_mac_address(priv, (u8 *) conf->mac_addr);
+        return 0;
+}
+
+static void lbtf_op_remove_interface(struct ieee80211_hw *hw,
+                        struct ieee80211_if_init_conf *conf)
+{
+        struct lbtf_private *priv = hw->priv;
+
+        if (priv->vif->type == IEEE80211_IF_TYPE_AP ||
+            priv->vif->type == IEEE80211_IF_TYPE_MESH_POINT)
+                lbtf_beacon_ctrl(priv, 0, 0);
+        lbtf_set_mode(priv, LBTF_PASSIVE_MODE);
+        lbtf_set_bssid(priv, 0, NULL);
+        priv->vif = NULL;
+}
+
+static int lbtf_op_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
+{
+        struct lbtf_private *priv = hw->priv;
+        if (conf->channel->center_freq != priv->cur_freq) {
+                priv->cur_freq = conf->channel->center_freq;
+                lbtf_set_channel(priv, conf->channel->hw_value);
+        }
+        return 0;
+}
+
+static int lbtf_op_config_interface(struct ieee80211_hw *hw,
+                        struct ieee80211_vif *vif,
+                        struct ieee80211_if_conf *conf)
+{
+        struct lbtf_private *priv = hw->priv;
+        struct sk_buff *beacon;
+
+        switch (priv->vif->type) {
+        case IEEE80211_IF_TYPE_AP:
+        case IEEE80211_IF_TYPE_MESH_POINT:
+                beacon = ieee80211_beacon_get(hw, vif);
+                if (beacon) {
+                        lbtf_beacon_set(priv, beacon);
+                        kfree_skb(beacon);
+                        lbtf_beacon_ctrl(priv, 1, hw->conf.beacon_int);
+                }
+                break;
+        default:
+                break;
+        }
+
+        if (conf->bssid) {
+                u8 null_bssid[ETH_ALEN] = {0};
+                bool activate = compare_ether_addr(conf->bssid, null_bssid);
+                lbtf_set_bssid(priv, activate, conf->bssid);
+        }
+
+        return 0;
+}
+
+#define SUPPORTED_FIF_FLAGS  (FIF_PROMISC_IN_BSS | FIF_ALLMULTI)
+static void lbtf_op_configure_filter(struct ieee80211_hw *hw,
+                        unsigned int changed_flags,
+                        unsigned int *new_flags,
+                        int mc_count, struct dev_mc_list *mclist)
+{
+        struct lbtf_private *priv = hw->priv;
+        int old_mac_control = priv->mac_control;
+        int i;
+        changed_flags &= SUPPORTED_FIF_FLAGS;
+        *new_flags &= SUPPORTED_FIF_FLAGS;
+
+        if (!changed_flags)
+                return;
+
+        if (*new_flags & (FIF_PROMISC_IN_BSS))
+                priv->mac_control |= CMD_ACT_MAC_PROMISCUOUS_ENABLE;
+        else
+                priv->mac_control &= ~CMD_ACT_MAC_PROMISCUOUS_ENABLE;
+        if (*new_flags & (FIF_ALLMULTI) ||
+            mc_count > MRVDRV_MAX_MULTICAST_LIST_SIZE) {
+                priv->mac_control |= CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
+                priv->mac_control &= ~CMD_ACT_MAC_MULTICAST_ENABLE;
+        } else if (mc_count) {
+                priv->mac_control |= CMD_ACT_MAC_MULTICAST_ENABLE;
+                priv->mac_control &= ~CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
+                priv->nr_of_multicastmacaddr = mc_count;
+                for (i = 0; i < mc_count; i++) {
+                        if (!mclist)
+                                break;
+                        memcpy(&priv->multicastlist[i], mclist->da_addr,
+                                        ETH_ALEN);
+                        mclist = mclist->next;
+                }
+                lbtf_cmd_set_mac_multicast_addr(priv);
+        } else {
+                priv->mac_control &= ~(CMD_ACT_MAC_MULTICAST_ENABLE |
+                                       CMD_ACT_MAC_ALL_MULTICAST_ENABLE);
+                if (priv->nr_of_multicastmacaddr) {
+                        priv->nr_of_multicastmacaddr = 0;
+                        lbtf_cmd_set_mac_multicast_addr(priv);
+                }
+        }
+
+
+        if (priv->mac_control != old_mac_control)
+                lbtf_set_mac_control(priv);
+}
+
+static void lbtf_op_bss_info_changed(struct ieee80211_hw *hw,
+                        struct ieee80211_vif *vif,
+                        struct ieee80211_bss_conf *bss_conf,
+                        u32 changes)
+{
+        struct lbtf_private *priv = hw->priv;
+
+        if (changes & BSS_CHANGED_ERP_PREAMBLE) {
+                if (bss_conf->use_short_preamble)
+                        priv->preamble = CMD_TYPE_SHORT_PREAMBLE;
+                else
+                        priv->preamble = CMD_TYPE_LONG_PREAMBLE;
+                lbtf_set_radio_control(priv);
+        }
+
+        return;
+}
+
+static const struct ieee80211_ops lbtf_ops = {
+        .tx                     = lbtf_op_tx,
+        .start                  = lbtf_op_start,
+        .stop                   = lbtf_op_stop,
+        .add_interface          = lbtf_op_add_interface,
+        .remove_interface       = lbtf_op_remove_interface,
+        .config                 = lbtf_op_config,
+        .config_interface       = lbtf_op_config_interface,
+        .configure_filter       = lbtf_op_configure_filter,
+        .bss_info_changed       = lbtf_op_bss_info_changed,
+};
+
+int lbtf_rx(struct lbtf_private *priv, struct sk_buff *skb)
+{
+        struct ieee80211_rx_status stats;
+        struct rxpd *prxpd;
+        bool is_qos, is_4addr, is_amsdu, need_padding;
+        unsigned int flags;
+        u16 fc, fc_le;
+
+        prxpd = (struct rxpd *) skb->data;
+
+        stats.flag = 0;
+        if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK)))
+                stats.flag |= RX_FLAG_FAILED_FCS_CRC;
+        stats.freq = priv->cur_freq;
+        stats.band = IEEE80211_BAND_2GHZ;
+        stats.signal = prxpd->snr;
+        stats.noise = prxpd->nf;
+        stats.qual = prxpd->snr - prxpd->nf;
+        /* Marvell rate index has a hole at value 4 */
+        if (prxpd->rx_rate > 4)
+                --prxpd->rx_rate;
+        stats.rate_idx = prxpd->rx_rate;
+        skb_pull(skb, sizeof(struct rxpd));
+
+        fc_le = *((__le16 *) skb->data);
+        fc = le16_to_cpu(fc_le);
+        flags = le32_to_cpu(*(__le32 *)(skb->data + 4));
+
+        is_qos = ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
+                 (fc & IEEE80211_STYPE_QOS_DATA);
+        is_4addr = (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
+                   (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS);
+        is_amsdu =  ((fc & 0x8C) == 0x88) &&
+                    (*(skb->data + ieee80211_hdrlen(fc_le) - QOS_CONTROL_LEN)
+                     & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT);
+
+        need_padding = is_qos ^ is_4addr ^ is_amsdu;
+        if (need_padding) {
+                memmove(skb->data + 2, skb->data, skb->len);
+                skb_reserve(skb, 2);
+        }
+
+        ieee80211_rx_irqsafe(priv->hw, skb, &stats);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(lbtf_rx);
+
+/**
+ * lbtf_add_card: Add and initialize the card, no fw upload yet.
+ *
+ *  @card    A pointer to card
+ *
+ *  Returns: pointer to struct lbtf_priv.
+ */
+struct lbtf_private *lbtf_add_card(void *card, struct device *dmdev)
+{
+        struct ieee80211_hw *hw;
+        struct lbtf_private *priv = NULL;
+
+        hw = ieee80211_alloc_hw(sizeof(struct lbtf_private), &lbtf_ops);
+        if (!hw)
+                goto done;
+
+        priv = hw->priv;
+        if (lbtf_init_adapter(priv))
+                goto err_init_adapter;
+
+        priv->hw = hw;
+        priv->card = card;
+        priv->tx_skb = NULL;
+
+        hw->queues = 1;
+        hw->flags = IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING;
+        hw->extra_tx_headroom = sizeof(struct txpd);
+        memcpy(priv->channels, lbtf_channels, sizeof(lbtf_channels));
+        memcpy(priv->rates, lbtf_rates, sizeof(lbtf_rates));
+        priv->band.n_bitrates = ARRAY_SIZE(lbtf_rates);
+        priv->band.bitrates = priv->rates;
+        priv->band.n_channels = ARRAY_SIZE(lbtf_channels);
+        priv->band.channels = priv->channels;
+        hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &priv->band;
+        skb_queue_head_init(&priv->bc_ps_buf);
+
+        SET_IEEE80211_DEV(hw, dmdev);
+
+        INIT_WORK(&priv->cmd_work, lbtf_cmd_work);
+        INIT_WORK(&priv->tx_work, lbtf_tx_work);
+        if (ieee80211_register_hw(hw))
+                goto err_init_adapter;
+
+        goto done;
+
+err_init_adapter:
+        lbtf_free_adapter(priv);
+        ieee80211_free_hw(hw);
+        priv = NULL;
+
+done:
+        return priv;
+}
+EXPORT_SYMBOL_GPL(lbtf_add_card);
+
+
+int lbtf_remove_card(struct lbtf_private *priv)
+{
+        struct ieee80211_hw *hw = priv->hw;
+
+        priv->surpriseremoved = 1;
+        del_timer(&priv->command_timer);
+        lbtf_free_adapter(priv);
+        priv->hw = NULL;
+        ieee80211_unregister_hw(hw);
+        ieee80211_free_hw(hw);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(lbtf_remove_card);
+
+void lbtf_send_tx_feedback(struct lbtf_private *priv, u8 retrycnt, u8 fail)
+{
+        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(priv->tx_skb);
+        memset(&info->status, 0, sizeof(info->status));
+        /*
+         * Commented out, otherwise we never go beyond 1Mbit/s using mac80211
+         * default pid rc algorithm.
+         *
+         * info->status.retry_count = MRVL_DEFAULT_RETRIES - retrycnt;
+         */
+        info->status.excessive_retries = fail ? 1 : 0;
+        if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) && !fail)
+                info->flags |= IEEE80211_TX_STAT_ACK;
+        skb_pull(priv->tx_skb, sizeof(struct txpd));
+        ieee80211_tx_status_irqsafe(priv->hw, priv->tx_skb);
+        priv->tx_skb = NULL;
+        if (!priv->skb_to_tx && skb_queue_empty(&priv->bc_ps_buf))
+                ieee80211_wake_queues(priv->hw);
+        else
+                queue_work(lbtf_wq, &priv->tx_work);
+}
+EXPORT_SYMBOL_GPL(lbtf_send_tx_feedback);
+
+void lbtf_bcn_sent(struct lbtf_private *priv)
+{
+        struct sk_buff *skb = NULL;
+
+        if (priv->vif->type != IEEE80211_IF_TYPE_AP)
+                return;
+
+        if (skb_queue_empty(&priv->bc_ps_buf)) {
+                bool tx_buff_bc = 0;
+
+                while ((skb = ieee80211_get_buffered_bc(priv->hw, priv->vif))) {
+                        skb_queue_tail(&priv->bc_ps_buf, skb);
+                        tx_buff_bc = 1;
+                }
+                if (tx_buff_bc) {
+                        ieee80211_stop_queues(priv->hw);
+                        queue_work(lbtf_wq, &priv->tx_work);
+                }
+        }
+
+        skb = ieee80211_beacon_get(priv->hw, priv->vif);
+
+        if (skb) {
+                lbtf_beacon_set(priv, skb);
+                kfree_skb(skb);
+        }
+}
+EXPORT_SYMBOL_GPL(lbtf_bcn_sent);
+
+static int __init lbtf_init_module(void)
+{
+        lbtf_wq = create_workqueue("libertastf");
+        if (lbtf_wq == NULL) {
+                printk(KERN_ERR "libertastf: couldn't create workqueue\n");
+                return -ENOMEM;
+        }
+        return 0;
+}
+
+static void __exit lbtf_exit_module(void)
+{
+        destroy_workqueue(lbtf_wq);
+}
+
+module_init(lbtf_init_module);
+module_exit(lbtf_exit_module);
+
+MODULE_DESCRIPTION("Libertas WLAN Thinfirm Driver Library");
+MODULE_AUTHOR("Cozybit Inc.");
+MODULE_LICENSE("GPL");