MTK平台 AP Nvram 如何实现更新某个nvram中某项数据

[DESCRIPTION]

已经出货手机，需要更新wifi nvram LID 中某项数据，因为这个数据是备份数据，而已经出货手机，不能再做校准，所以在开机使用前实时改；

[SOLUTION]

• 修改　libnvram_daemon_callback.c, 客制化my_callback 函数

int my_callback(void) {
    F_ID wifi_nvram_fd;
    int iFileDesc;
    int rec_size = 0;
    int rec_num = 0;
    int result = 0;
    WIFI_CFG_PARAM_STRUCT pPara;
    INT_8 cTxPwr5GOFDM_BPSK;
    INT_8 ucEnable5GBand;
    const TCFG_FILE *pCfgFielTable = NULL;
    int wifisize = 0;
    wifisize = sizeof(WIFI_CFG_PARAM_STRUCT);

    ALOGD("whf nvram daemon callback will run!!!");
    ALOGD("whf my_callback, wifisize: %d",wifisize);
    wifi_nvram_fd = NVM_GetFileDesc(iFileWIFILID, &rec_size, &rec_num, true);
    ALOGD("whf my_callback, rec_size: %d, rec_num: %d", rec_size, rec_num);
    ALOGD("whf my_callback, rec_size wifi_nvram_fd.iFileDesc=%d", wifi_nvram_fd.iFileDesc);
    if (wifi_nvram_fd.iFileDesc != -1)
    {
                ALOGD("whf my_callback, rec_size:");
        result = read(wifi_nvram_fd.iFileDesc, &pPara , rec_size * rec_num);
        if(result ==-1)
        {
            ALOGD("whf read end error\n");
            return -1;
        }
        else
        {
            NVM_CloseFileDesc(wifi_nvram_fd);
            ALOGD("whf read end\n");
        }
    }
    else
    {
        ALOGD("whf read cTxPwr5GOFDM_BPSK %s\n", strerror(errno));
        return -1;
    }

    if (pPara.rTxPwr.cTxPwr5GOFDM_BPSK != 36)
    {
        //1. memcpy 17321 para to pPara
        //update_wifi_nvram_data(pPara, rec_size * rec_num);
        //2.update nv flag
        pPara.rTxPwr.cTxPwr5GOFDM_BPSK = 36; //0x24= 36

        wifi_nvram_fd = NVM_GetFileDesc(iFileWIFILID, &rec_size, &rec_num, ISWRITE);

        if (wifi_nvram_fd.iFileDesc != -1)
        {
            result = write(wifi_nvram_fd.iFileDesc, &pPara,rec_size * rec_num);
            if(result ==-1)
            {
            ALOGD("whf write error %s\n", strerror(errno));
            return -1;
            }
            else
            {
            ALOGD("whf write \n");
            NVM_CloseFileDesc(wifi_nvram_fd);}
        }
        else
        {
            ALOGD("whf write NVM_GetFileDesc %s\n", strerror(errno));
            return -1;
        }

    }
    return 0;

}