wifi(rtl8188eu)移植及调试笔记

/*
* Dave/[email protected]
*/

wifi移植及调试笔记

一.rtl8188eu

1.修改设备树:
添加wifi ap电源控制引脚

WIFI,power_ap_gpio = <&gpio3 GPIO_B5 GPIO_ACTIVE_LOW>;

2.修改文件:include/linux/rfkill-wlan.h
增加gpio资源:

struct rksdmmc_iomux {
        char    *name;  //set the MACRO of gpio
        int     fgpio;
        int     fmux;
    };
    struct rksdmmc_gpio {
        int     io;                             //set the address of gpio
        char    name[64];   //
        int     enable;  // disable = !enable   //set the default value,i.e,GPIO_HIGH or GPIO_LOW
        struct rksdmmc_iomux  iomux;
    };
struct rksdmmc_pmu {
        bool power_ctrl_by_pmu;
        char pmu_regulator[20];
        int  enable;
    };
    struct rksdmmc_gpio_wifi_moudle {
        int sdio_vol;    //sdio reference voltage
        bool vref_ctrl_enble;
        bool wifi_power_remain;
        struct rksdmmc_pmu    mregulator;
        struct rksdmmc_pmu    ioregulator;
        struct rksdmmc_gpio   power_n;  //PMU_EN  
        struct rksdmmc_gpio   reset_n;  //SYSRET_B, DAIRST 
        struct rksdmmc_gpio   vddio;
        struct rksdmmc_gpio   bgf_int_b;
        struct rksdmmc_gpio   wifi_int_b;
        struct rksdmmc_gpio   gps_sync;
        struct rksdmmc_gpio   ANTSEL2;  //pin5--ANTSEL2  
        struct rksdmmc_gpio   ANTSEL3;  //pin6--ANTSEL3 
        struct rksdmmc_gpio   GPS_LAN;  //pin33--GPS_LAN
        struct regmap *grf;
        struct rksdmmc_gpio   power_ap;   //add
    };

3.修改文件:linux-3.10.0-rk32xx/net/rfkill/rfkill-wlan.c
<1>.申请gpio资源,修改函数如下:

static int wlan_platdata_parse_dt(struct device *dev, struct rksdmmc_gpio_wifi_moudle *data)
    gpio = of_get_named_gpio_flags(node, "WIFI,power_ap_gpio", 0, &flags);
    if (gpio_is_valid(gpio)){
        data->power_ap.io = gpio;
        data->power_ap.enable = (flags == GPIO_ACTIVE_HIGH)? 1:0;
        LOG("%s: get property: WIFI,power_ap_gpio = %d, flags = %d.\n", __func__, gpio, flags);
          } 
    else data->power_ap.io = -1;
<2>.power控制函数:
int rockchip_wifi_power_ap(int on)
    {
        struct rfkill_wlan_data *mrfkill = g_rfkill;

        LOG("%s: %d\n", __func__, on);

        if (mrfkill == NULL) {
            LOG("%s: rfkill-wlan driver has not Successful initialized\n", __func__);
            return -1;
        }
        poweron = &mrfkill->pdata->power_ap;
        if (on){
        if (gpio_is_valid(poweron->io)) {
            gpio_set_value(poweron->io, poweron->enable);
            msleep(100);
        }
        if (gpio_is_valid(reset->io)) {
            gpio_set_value(reset->io, reset->enable);
            msleep(100);
        }
        wifi_power_state = 1;
        LOG("wifi turn on power. %d\n", poweron->io);
        }else{
        if (gpio_is_valid(poweron->io)) {
            gpio_set_value(poweron->io, !(poweron->enable));
            msleep(100);
        }
        if (gpio_is_valid(reset->io)) {
            gpio_set_value(reset->io, !(reset->enable));
        }
        wifi_power_state = 0;
        LOG("wifi shut off power.\n");
        }
        return 0;
    }
    EXPORT_SYMBOL(rockchip_wifi_power_ap);
<3>.匹配函数修改添加:
int rfkill_wlan_probe(struct platform_device *pdev)
    if (gpio_is_valid(pdata->power_p.io))
    {
    gpio_direction_output(pdata->power_ap.io, !pdata->power_ap.enable);
    }
    {
       -rockchip_wifi_power(1); //原有
       +rockchip_wifi_power_ap(1);//add
    }
<4>.移除函数修改与添加
static int rfkill_wlan_remove(struct platform_device *pdev)
    +if (gpio_is_valid(rfkill->pdata->power_ap.io))
        +gpio_free(rfkill->pdata->power_ap.io);

4.在/sys/class/rkwifi/下添加控制节点
添加节点1. /sys/class/rkwifi/power_ap

+static ssize_t wifi_power_write_ap(struct class *cls, struct class_attribute *attr, const char *_buf, size_t _count)
    {
        int poweren = 0;
        poweren = simple_strtol(_buf, NULL, 10);
        printk("%s: poweren = %d\n", __func__, poweren);
        if(poweren > 0) {
            rockchip_wifi_power_ap(1);
        } else {
            rockchip_wifi_power_ap(0);
        }
        return _count;
    }
    +static CLASS_ATTR(power_ap, 0660, NULL, wifi_power_write_ap);
在入口函数rkwifi_sysif_init(void)添加:
+ret =  class_create_file(rkwifi_class, &class_attr_power_ap);
在出口函数rkwifi_sysif_exit(void)添加:
+class_remove_file(rkwifi_class, &class_attr_power_ap);
添加节点2. /sys/class/rkwifi/ap
+static ssize_t wifi_driver_ap(struct class *cls, struct class_attribute *attr, const char *_buf, size_t _count)
    {
        int enable = 0, ret = 0;        
        down(&driver_sem);
        enable = simple_strtol(_buf, NULL, 10);
        //printk("%s: enable = %d\n", __func__, enable);
        if (ap_driver_insmod == enable) {
            printk("%s: wifi driver already %s\n", __func__, enable? "insmod":"rmmod");
            up(&driver_sem);
            return _count;
        }
        if(enable > 0) {
            ret = ap_init_exit_module(enable);
            if (ret >= 0)
                ap_driver_insmod = enable;
        } else {
            ap_init_exit_module(enable);
            ap_driver_insmod = enable;
        }    
        up(&driver_sem);
        return _count; 
    }
    static CLASS_ATTR(ap, 0660, NULL, wifi_driver_ap);
在入口函数rkwifi_sysif_init(void)添加:
ret =  class_create_file(rkwifi_class, &class_attr_ap)
在出口函数rkwifi_sysif_exit(void)添加:
class_remove_file(rkwifi_class, &class_attr_ap);

5.将power gpio与rtl8188eu驱动进行关联
rockchip_wifi_init_module_rtkwifi()函数中注-if (type < WIFI_AP6XXX_SERIES || type == WIFI_ESP8089) return 0;
-rockchip_wifi_power(1);
+rockchip_wifi_power_ap(1);rockchip_wifi_exit_module_rtkwifi(void)函数中注释

-if (type < WIFI_AP6XXX_SERIES || type == WIFI_ESP8089) return;
        -rockchip_wifi_power(0);
        +rockchip_wifi_power_ap(0);
6.启动rtl8188eu ap模式
echo 1 > /sys/class/rfwifi/power_ap
echo 1 > /sys/class/rfwifi/ap
ifconfig wlan0 up
ifconfig 

7.启动dnsmasq服务
修改配置文件dnsmasq.conf:

interface=wlan0
    listen-address=192.168.1.1
    dhcp-range=192.168.1.50,192.168.1.150,12h
    server=/google/8.8.8.8
启动dnsmasq服务:
dnsmasq &

8.配置wlan0的IP地址
ifconfig wlan0 192.16.1.111
9.配置hostapd.conf

interface=wlan0
    driver=nl80211
    ssid=ProUHD_Wifi
    channel=6
    hw_mode=g
    ignore_broadcast_ssid=0
    auth_algs=1
    wpa=3
    wpa_passphrase=novastar
    wpa_key_mgmt=WPA-PSK
    wpa_pairwise=TKIP
    rsn_pairwise=CCMP
启动hostapd:
hostapd -dd hostapd.conf

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