wifi（rtl8188eu）移植及调试笔记

/*
* Dave/[e-mail]
*/

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_apecho 1 > /sys/class/rfwifi/apifconfig wlan0 upifconfig 

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