hellolwl

摘要： 现在我们来看看scan是怎么处理的。一、先来看看如何发送scan command给WLAN firmware以Android平台为例，我们从Android framework的code开始看起。1. 在WifiStateMachine.java中有如下函数 public void startScan(boolean forceActive) { sendMessage(obtainMessage(CMD_START_SCAN, forceActive ? SCAN_ACTIVE : SCAN_PASSIVE, 0)); }2. proce... 阅读全文

摘要： 在https://wiki.archlinux.org/index.php/Broadcom_wireless里面关于broadcom的wireless驱动有这样的说明The brcm80211 drivers are included in the kernel. They are named brcmsmac for PCI cards and brcmfmac for SDIO devices.这里我们分析针对SDIO设备的brcmfmac驱动。1. 驱动主入口void brcmf_sdio_init(void){ int ret; brcmf_dbg(TRACE, "Ent. 阅读全文

摘要： Linux kernel发送数据的接口函数是packet_sendmsg，本质上对应了users pace的sendmsg实现。比如在wpa_supplicant中，wpa_driver_nl80211_send_frame()就是用sendmsg发送数据的：static int wpa_driver_nl80211_send_frame(struct wpa_driver_nl80211_data *drv, const void *data, size_t len, int encrypt){ ... ... 阅读全文

摘要： 现在我们来看看driver是如何从WLAN chipset那里接收数据的在上一篇文章中提到，数据过来时会产生中断，而在brcms_attach()函数体中，注册的interrupt handler是brcms_isr()，所以数据过来触发的第一个函数就是brcms_isr()。1. 触发brcms_isr()static irqreturn_t brcms_isr(int irq, void *dev_id){ struct brcms_info *wl; irqreturn_t ret = IRQ_NONE; wl = (struct brcms_info *) dev_i... 阅读全文

摘要： 1. 驱动的主入口如下：/** * This is the main entry point for the brcmsmac driver. * * This function is scheduled upon module initialization and * does the driver registration, which result in brcms_bcma_probe() * call resulting in the driver bringup. */static void brcms_driver_init(struct work_struct *work){ 阅读全文