wireless extention扩展接口

wlan_add_card=>
wlan_create_thread(wlan_service_main_thread, &priv->MainThread, "wlan_main_service");
=>wlan_service_main_thread=>wlan_exec_next_cmd=>
将调用wlan_enter_ps和wlan_exit_ps


sbi_interrupt=>从sdio口上传来的中断数据,sdio_irq_thread=>process_sdio_pending_irqs=>调用func->irq_handler(func);即本.
在mmc_signal_sdio_irq=>将调用wake_up_process(host->sdio_irq_thread);来唤醒该irq处理线程,可能还有其他命令需要处理wlan_exec_next_cmd
这个pxamci_irq就是mmc的物理irq中断了,pxamci_irq=>mmc_signal_sdio_irq(host->mmc);

wlan_exec_next_cmd=>只要cmd链表上CmdNode还存在,
那么就会执行wlan_dnld_cmd_to_fw(wlan_private * priv, CmdCtrlNode * CmdNode)将CmdNode中的数据下发下去,
然后重新触发wlan_mod_timer(&Adapter->MrvDrvCommandTimer, MRVDRV_TIMER_5S);
也就是wlan_cmd_timeout_func命令超时处理函数,
在cmd已经有了恢复之后,在主线程中调用wlan_process_cmdresp,立即调用wlan_cancel_timer(&Adapter->MrvDrvCommandTimer);来删除定时器

wlan_service_main_thread=>每次唤醒都会检查
====
    /* Execute the next command */
    if (!priv->wlan_dev.cmd_sent && !Adapter->CurCmd)
        wlan_exec_next_cmd(priv);
====


wlan_prepare_cmd=>
wlan_hostcmd_ioctl=>
获取一个空闲的CmdNode节点wlan_get_cmd_node,当完成赋值之后,执行如下语句,将CmdNode节点添加到处理队列中:
wlan_insert_cmd_to_pending_q(Adapter, CmdNode, TRUE);
wake_up_interruptible(&priv->MainThread.waitQ);
另外在数组中
/*
 * iwconfig settable callbacks 
 */
static const iw_handler wlan_handler[]这个数组中全部是回调函数,

/** wlan_handler_def */
struct iw_handler_def wlan_handler_def = {
  num_standard:sizeof(wlan_handler) / sizeof(iw_handler),
  num_private:sizeof(wlan_private_handler) / sizeof(iw_handler),
  num_private_args:sizeof(wlan_private_args) / sizeof(struct iw_priv_args),
  standard:(iw_handler *) wlan_handler,
  private:(iw_handler *) wlan_private_handler,
  private_args:(struct iw_priv_args *) wlan_private_args,
#if WIRELESS_EXT > 20
  get_wireless_stats:wlan_get_wireless_stats,
#endif
};
在wlan_add_card函数中
dev->wireless_handlers = (struct iw_handler_def *) &wlan_handler_def;

===============在kernel的net中使用wireless extention扩展接口

static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
{
    /* Don't "optimise" the following variable, it will crash */
    unsigned int    index;        /* *MUST* be unsigned */

    /* Check if we have some wireless handlers defined */
    if (dev->wireless_handlers == NULL)
        return NULL;

    /* Try as a standard command */
    index = cmd - SIOCIWFIRST;
    if (index < dev->wireless_handlers->num_standard)
        return dev->wireless_handlers->standard[index];

    /* Try as a private command */
    index = cmd - SIOCIWFIRSTPRIV;
    if (index < dev->wireless_handlers->num_private)
        return dev->wireless_handlers->private[index];

    /* Not found */
    return NULL;
}


=>sock_ioctl
=>dev_ioctl
+++/* Take care of Wireless Extensions */
+++if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
+++return wext_handle_ioctl(net, &ifr, cmd, arg);
=>wext_handle_ioctl
=>wireless_process_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd)
=>get_handler(dev, cmd);如果没有实现该cmd,那么将调用dev->do_ioctl来处理,


wlan_reassoc_timer_func=>
wmm_start_queue=>
wlan_tx_packet=>
wlan_tx_timeout=>
wlan_remove_card=>
wlan_hostcmd_ioctl=>
wlan_auto_deep_sleep=>
wlan_set_deep_sleep=>
wlan_prepare_cmd=>
wlan_cmd_timeout_func=>
将调用wake_up_interruptible(&priv->MainThread.waitQ);唤醒wlan_service_main_thread主处理线程.

wlan_hard_start_xmit=>wlan_tx_packet发送数据包
dev->tx_timeout = wlan_tx_timeout;
wlan_initialize_timer(&Adapter->MrvDrvCommandTimer, wlan_cmd_timeout_func, priv);

int wlan_do_ioctl(struct net_device *dev, struct ifreq *req, int cmd)
{
    ...
        case WLAN_WAKEUP_MT:
            if (wrq->u.data.length > 0)
                Adapter->IntCounter++;
            wake_up_interruptible(&priv->MainThread.waitQ);
            break;
    ...
}


在wlan_process_cmdresp()处理完该cmd之后,调用
wlan_insert_cmd_to_free_q=>wlan_clean_cmd_noder,从命令链表上删除已经处理完成的cmd_node,
wlan_clean_cmd_noder然后pTempNode->CmdWaitQWoken = TRUE;同时如果该cmd_node是一个被阻塞等待的,那么唤醒等待的程序.
wake_up_interruptible(&pTempNode->cmdwait_q);

http://blog.csdn.net/lcw_202/article/details/5993902