1：關於wifi 匯流排sdio的配置，前面的部落格已經說過2：這一章主要描述wifi移植WL_REG_ON 主要用於上電，休眠的時候，請保持該GPIO上電，否則會丟失wifi內部的狀態，導致wifi喚醒失敗；WL_HOST_WAKE 主要用於wifi裝置有資料的時候，喚醒CPU，進入中斷，關於中斷流程上面已經說過。3：主要包含的檔案有： 1>: bcmdhd.ko wifi驅動模組 2>:fw_bcmdhd_bin; wifi韌體 3>nvram.txt wifi的配置資訊 4>dhd 或者wl 用於使用者測試4：make menuconfig CONFIG_CFG80211=m 使用cfg80211.ko 5：將驅動加入核心 kernel/driver/net/wireless/bcmdhd/ 6: 在kernel/driver/net/wireless/Kconfig 加入 source "driver/net/wireless/bcmdhd/Kconfig" 7: 在kernel/driver/net/wireless/Makefile 加入 obj-$(CONFIG_BCMDHD) += bcmdhd/8:make menuconfig9:wifi GPIO配置 host_wakeWL_REG_ON
10:修改BroadConfig.mk# WifiBOARD_WLAN_VENDOR := broadcom#for broadcom vendorifeq ($(BOARD_WLAN_VENDOR),broadcom)BOARD_WLAN_DEVICE := bcmdhdWPA_SUPPLICANT_VERSION := VER_0_8_XTARGET_KERNEL_MODULES := \ kernel_imx/drivers/net/wireless/bcmdhd/bcmdhd.ko:system/lib/modules/bcmdhd.ko \ kernel_imx/net/wireless/cfg80211.ko:system/lib/modules/cfg80211.koBOARD_WPA_SUPPLICANT_DRIVER := NL80211BOARD_HOSTAPD_DRIVER := NL80211BOARD_HOSTAPD_PRIVATE_LIB_BCM := lib_driver_cmd_bcmdhdBOARD_WPA_SUPPLICANT_PRIVATE_LIB_BCM := lib_driver_cmd_bcmdhdWIFI_DRIVER_FW_PATH_PARAM := "/sys/module/bcmdhd/parameters/firmware_path"WIFI_DRIVER_MODULE_PATH := "/system/lib/modules/bcmdhd.ko"WIFI_DRIVER_MODULE_NAME := "bcmdhd"WIFI_DRIVER_MODULE_ARG := "iface_name=wlan firmware_path=/system/vendor/firmware/fw_bcmdhd.bin nvram_path=/system/vendor/firmware/nvram.txt"SW_BOARD_USR_WIFI := bcm4335WIFI_DRIVER_FW_PATH_STA := "/system/vendor/firmware/fw_bcmdhd.bin"WIFI_DRIVER_FW_PATH_AP := "/system/vendor/firmware/fw_bcmdhd_ap.bin"BCM_NVRAM_SRC_FILE := "/system/vendor/firmware/nvram.txt"BCM_CONFIG_SRC_FILE := "/system/etc/firmware/config.txt"11:修改init.rcservice p2p_supplicant /system/bin/wpa_supplicant \ -ip2p0 -Dnl80211 -c/data/misc/wifi/p2p_supplicant.conf \ -I/system/etc/wifi/p2p_supplicant_overlay.conf -N \ -iwlan0 -Dnl80211 -c/data/misc/wifi/wpa_supplicant.conf \ -I/system/etc/wifi/wpa_supplicant_overlay.conf \ -O/data/misc/wifi/sockets -puse_p2p_group_interface=1 \ -e/data/misc/wifi/entropy.bin

[email protected]:wpa_wlan0 class main socket wpa_wlan0 dgram 660 wifi wifi disabled oneshotservice wpa_supplicant /system/bin/wpa_supplicant \ -iwlan0 -Dnl80211 -c/data/misc/wifi/wpa_supplicant.conf \ -I/system/etc/wifi/wpa_supplicant_overlay.conf \ -O/data/misc/wifi/sockets \ -e/data/misc/wifi/entropy.bin

[email protected]:wpa_wlan0 socket wpa_wlan0 dgram 660 wifi wifi class main disabled oneshotwpa_ctil 與wpa_supplicant 主要使用socket通訊，套接字目錄： 1：/dev/socket/wpa_wlan0 2:/data/misc/wifi/sockets/

int wifi_connect_on_socket_path(const char *path)
{
    char supp_status[PROPERTY_VALUE_MAX] = {'\0'};

    /* Make sure supplicant is running */
    if (!property_get(supplicant_prop_name, supp_status, NULL)
            || strcmp(supp_status, "running") != 0) {
        ALOGE("Supplicant not running, cannot connect");
        return -1;
    }

    ctrl_conn = wpa_ctrl_open(path);
    if (ctrl_conn == NULL) {
        ALOGE("Unable to open connection to supplicant on \"%s\": %s",
             path, strerror(errno));
        return -1;
    }
    monitor_conn = wpa_ctrl_open(path);
    if (monitor_conn == NULL) {
        wpa_ctrl_close(ctrl_conn);
        ctrl_conn = NULL;
        return -1;
    }
    if (wpa_ctrl_attach(monitor_conn) != 0) {
        wpa_ctrl_close(monitor_conn);
        wpa_ctrl_close(ctrl_conn);
        ctrl_conn = monitor_conn = NULL;
        return -1;
    }

    if (socketpair(AF_UNIX, SOCK_STREAM, 0, exit_sockets) == -1) {
        wpa_ctrl_close(monitor_conn);
        wpa_ctrl_close(ctrl_conn);
        ctrl_conn = monitor_conn = NULL;
        return -1;
    }

    return 0;
}

/* Establishes the control and monitor socket connections on the interface */
int wifi_connect_to_supplicant()
{
    static char path[PATH_MAX];

    if (access(IFACE_DIR, F_OK) == 0) {
        snprintf(path, sizeof(path), "%s/%s", IFACE_DIR, primary_iface);//primary_iface = wlan0
    } else {
        snprintf(path, sizeof(path), "@android:wpa_%s", primary_iface);
    }
    return wifi_connect_on_socket_path(path);
}
 

12:除錯 1：insmod cfg80211.ko 2: insmode bcmdhd.koifconfig wlan0 up 檢視wifi驅動是否載入正常，如果不正常一般是GPIO配置不正確，上電時序錯誤等，需要使用示波器測試時序，可以測試SDIO是否有資料。13：修改hal層根據自定義二個.ko ,修改hal層，載入wifi驅動