全志平台ap6476 wifi模组调试（2）驱动移植& 配置文件修改

1. 前言

基于上篇的环境，继续修改；
这里主要是修改驱动模块和配置文件

2. driver修改

当前broadcom系统的ap6xxx模组，wifi是共用同一份驱动，增加同系列的一款wifi的支持，仅需要修改驱动的dhd_common_init()函数，指定firmware和nvram的路径名和名称

void
dhd_common_init(osl_t *osh)
{
    int select_type = 0;
    //aw checkout which wifi had select
    select_type = wifi_pm_get_mod_type();

#ifdef CONFIG_BCMDHD_FW_PATH
    //select ap6181 or ap6210 or ap6476
    if (select_type == 1 || select_type == 2 || select_type == 10) {
        bcm_strncpy_s(fw_path, sizeof(fw_path), "/system/vendor/modules/fw_bcm40181a2.bin", MOD_PARAM_PATHLEN-1);
    }
#else /* CONFIG_BCMDHD_FW_PATH */
    fw_path[0] = '\0';
#endif /* CONFIG_BCMDHD_FW_PATH */
#ifdef CONFIG_BCMDHD_NVRAM_PATH

......
    //select ap6476
    if (select_type == 10) {
        bcm_strncpy_s(nv_path, sizeof(nv_path), "/system/vendor/modules/nvram_ap6476.txt", MOD_PARAM_PATHLEN-1);
    }
#else /* CONFIG_BCMDHD_NVRAM_PATH */
    nv_path[0] = '\0';
#endif /* CONFIG_BCMDHD_NVRAM_PATH */

.......

#ifdef SOFTAP
    fw_path2[0] = '\0';
#endif
}

bcmdhd驱动是built-in到内核，在系统启动驱动被加载时会做检测firmware和nvram的操作

3. 电源管理修改

rf电源管理要添加ap6476的支持，包括两个方面，一是wifi电源管理的支持，二是PG组I/O电压要调成1.8V。

ap6476 wifi电源管理的支持需要在wifi_pm.c中做修改，修改的地方如下

@@ -22,6 +22,7 @@ static char* wifi_mod[] = {" ",
        "mtk6620",        /* 7 - MTK6620() */
        "rtl8723au",  /* 8 - RTL8723AU*/
        "ap6330",     /* 9 - AP6330*/
+       "ap6476",     /* 10- AP6476*/
 };

 int wifi_pm_get_mod_type(void)
@@ -193,6 +194,9 @@ static int __devinit wifi_pm_probe(struct platform_device *pdev)
                case 9: /* AP6330 */
                        ap6xxx_gpio_init();
                        break;
+               case 10: /* AP6476 */
+                       ap6xxx_gpio_init();
+                       break;
                default:
                        wifi_pm_msg("wrong sdio module select %d !\n", ops->module_sel.val);
        }

PG的电压是由axp22_dldo2提供，axp22_dldo2的电压决定PG组的I/O电压，要把PG的I/O电压需要修改wifi_pm_ap6xxx.c文件，把axp22_dldo2电压值设成1.8V，修改如下

@@ -41,8 +85,8 @@ static int ap6xxx_module_power(int onoff)
        }

        if (onoff) {
-               ap6xxx_msg("regulator on.\n");
-               ret = regulator_set_voltage(wifi_ldo, 3300000, 3300000);
+               ap6xxx_msg("regulator on, PG->1.8v.\n");
+               ret = regulator_set_voltage(wifi_ldo, 1800000, 1800000);
                if (ret < 0) {
                        ap6xxx_msg("regulator_set_voltage fail, return %d.\n", ret);
                        regulator_put(wifi_ldo);

4. 安卓平台文件修改

（1）BoardConfig.mk

BoardConfig.mk是android系统平台配置文件，wpa_supplicant的版本、驱动接口、相关库名和所使用的wifi模组设备均是在BoardConfig.mk中指定

BOARD_WIFI_VENDOR := broadcom
ifeq ($(BOARD_WIFI_VENDOR), broadcom)
    BOARD_WPA_SUPPLICANT_DRIVER := NL80211
    WPA_SUPPLICANT_VERSION      := VER_0_8_X
    BOARD_WPA_SUPPLICANT_PRIVATE_LIB := lib_driver_cmd_bcmdhd
    BOARD_HOSTAPD_DRIVER        := NL80211
    BOARD_HOSTAPD_PRIVATE_LIB   := lib_driver_cmd_bcmdhd
    BOARD_WLAN_DEVICE           := bcmdhd
    WIFI_DRIVER_FW_PATH_PARAM   := "/sys/module/bcmdhd/parameters/firmware_path"

    SW_BOARD_USR_WIFI := AP6476
    WIFI_DRIVER_FW_PATH_STA    := "/system/vendor/modules/fw_bcm40181a2.bin"
    WIFI_DRIVER_FW_PATH_P2P    := "/system/vendor/modules/fw_bcm40181a2_p2p.bin"
    WIFI_DRIVER_FW_PATH_AP     := "/system/vendor/modules/fw_bcm40181a2_apsta.bin"
endif

对于ap6476 wifi，需要在BoardConfig.mk中添加以上内容，其中firmware的路径和名称在wifi打开时会经由HAL传给wifi驱动。

（2）fiber_xxx.mk
fiber_xxx.mk中要添加对firmware和nvram文件拷贝的操作

# ap6476 fw and nvram
PRODUCT_COPY_FILES += \
hardware/broadcom/wlan/firmware/ap6476/fw_bcm40181a2.bin:system/vendor/modules/fw_bcm40181a2.bin \
hardware/broadcom/wlan/firmware/ap6476/fw_bcm40181a2_apsta.bin:system/vendor/modules/fw_bcm40181a2_apsta.bin \
hardware/broadcom/wlan/firmware/ap6476/fw_bcm40181a2_p2p.bin:system/vendor/modules/fw_bcm40181a2_p2p.bin \
hardware/broadcom/wlan/firmware/ap6476/nvram_ap6476.txt:system/vendor/modules/nvram_ap6476.txt

在android开始编译时就会执行fiber_xxx.mk文件，把相关的文件拷贝到out目录下对应的文件夹

5. 启动脚本修改

init.sun6i.rc中添加wifi station和softap的wpa_supplicant服务、p2p的p2p_supplicant服务。

# broadcom wifi service
# broadcom wifi station and softap
service wpa_supplicant /system/bin/wpa_supplicant \
    -iwlan0 -Dnl80211 -c/data/misc/wifi/wpa_supplicant.conf -e/data/misc/wifi/entropy.bin
    class main
    socket wpa_wlan0 dgram 660 wifi wifi
    disabled
    oneshot

# braodcom wifi sta p2p concurrent service
service p2p_supplicant /system/bin/wpa_supplicant \
    -iwlan0 -Dnl80211 -c/data/misc/wifi/wpa_supplicant.conf -N \
    -ip2p0 -Dnl80211 -c/data/misc/wifi/p2p_supplicant.conf -e/data/misc/wifi/entropy.bin -puse_p2p_group_interface=1
    class main
    socket wpa_wlan0 dgram 660 wifi wifi
    disabled
    oneshot

这两个服务是在wifi打开时由HAL(wifi.c)层开启的。