wifi 移植过程

1：关于wifi 总线sdio的配置，前面的博客已经说过

2：这一章主要描述wifi移植

WL_REG_ON 主要用于上电，休眠的时候，请保持该GPIO上电，否则会丢失wifi内部的状态，导致wifi唤醒失败；

WL_HOST_WAKE 主要用于wifi设备有数据的时候，唤醒CPU，进入中断，关于中断流程上面已经说过。

3：主要包含的文件有：

1>: bcmdhd.ko wifi驱动模块

2>:fw_bcmdhd_bin; wifi固件

3>nvram.txt wifi的配置信息

4>dhd 或者wl 用于用户测试

4：make menuconfig

CONFIG_CFG80211=m

使用cfg80211.ko

5：将驱动加入内核 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 menuconfig

9:wifi GPIO配置 host_wake

WL_REG_ON

10:修改BroadConfig.mk

# Wifi

BOARD_WLAN_VENDOR := broadcom

#for broadcom vendor

ifeq ($(BOARD_WLAN_VENDOR),broadcom)

BOARD_WLAN_DEVICE := bcmdhd

WPA_SUPPLICANT_VERSION := VER_0_8_X

TARGET_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.ko

BOARD_WPA_SUPPLICANT_DRIVER := NL80211

BOARD_HOSTAPD_DRIVER := NL80211

BOARD_HOSTAPD_PRIVATE_LIB_BCM := lib_driver_cmd_bcmdhd

BOARD_WPA_SUPPLICANT_PRIVATE_LIB_BCM := lib_driver_cmd_bcmdhd

WIFI_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 := bcm4335

WIFI_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.rc

service 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 -g@android:wpa_wlan0

class main

socket wpa_wlan0 dgram 660 wifi wifi

disabled

oneshot

service 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 -g@android:wpa_wlan0

socket wpa_wlan0 dgram 660 wifi wifi

class main

disabled

oneshot

wpa_ctil 与wpa_supplicant 主要使用socket通信，套接字目录：

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:调试

1：insmod cfg80211.ko

2: insmode bcmdhd.ko

ifconfig wlan0 up 查看wifi驱动是否加载正常，如果不正常一般是GPIO配置不正确，上电时序错误等，需要使用示波器测试时序，可以测试SDIO是否有数据。

13：修改hal层

根据自定义二个.ko ,修改hal层，加载wifi驱动