1. 简介

2. BCMDHD

• BCMDHD：Broadcom Dongle Host Driver
• SIP：System In Package

2.1 WiFi模组

2.2 驱动初始化（dhd_module_init）

• dhd_module_init

dhd_module_init =>   # dhd_linux.c (drivers\net\wireless\bcmdhd) dhd_wifi_platform_register_drv =>wifi_ctrlfunc_register_dr =>dhd_wifi_platform_load => # 对于不同接口，包括usb，sdio，pcie的wifi进行加载dhd_wifi_platform_load_sdio =>  # 主要是给所有adapters上电，然后匹配funcdhd_bus_register => # 主要是注册sdio驱动sdio_register_driver(&dummy_sdmmc_driver);# 通过总线驱动sdio_bus_match匹配，# 主要匹配三个参数ids->class || ids->vendor || ids->device。# 匹配成功后调用bcmsdh_sdmmc_probe 》 sdioh_probe 》 bcmsdh_probe bcmsdh_register =>  # 注册bcmsdh_driver_t dhd_sdio

• dhd_sdio驱动

static bcmsdh_driver_t dhd_sdio = {dhdsdio_probe,dhdsdio_disconnect,dhdsdio_suspend,dhdsdio_resume
};

• dhdsdio_probe

dhdsdio_probe =>dhd_attach =>  #  绑定到dhd/OS/网口, 对DHD管理的每个硬件(狗)实例调用一次wl_cfg80211_attach # 把设备注册到cfg80211，操作函数是wl_cfg80211_ops, 注册到rfkillwl_iw_attach       # 加入到iw里面dhd_dpc_thread     # 启动延迟函数，也就是中断后半部dhd_rxf_thread     # 启动 网络包接收线程  dhd_attach_net =>dhd_register_if    # Register primary net device , 这里的need_rtnl_lock=truewl_cfg80211_net_attach # 加入到cfg80211里面，cfg80211是Linux 802.11用于管理配置的一套API，# 它是用户和驱动之间的桥梁，替代了WEXT，提供和802.11相关的功能

3. Broadcom fullmac WLAN

• The brcm80211 drivers are included in the kernel. They are named brcmsmac for PCI cards and brcmfmac for SDIO devices.
• SDIO设备驱动代码

drivers/net/wireless/broadcom/brcm80211/brcmfmac