UsbController.cpp

/*
 * Copyright (C) 2008 The Android Open Source Project
 * Copyright (C) 2011-2013 The CyanogenMod Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>


#include <netinet/in.h>
#include <arpa/inet.h>

#define LOG_TAG "UsbController"
#include <cutils/log.h>
#include <cutils/properties.h>
#include <string.h>

#include "UsbController.h"


UsbController::UsbController() {
}

UsbController::~UsbController() {
}

int UsbController::startRNDIS() {
    LOGD("Usb RNDIS start");
    return enableRNDIS(true);
}

int UsbController::stopRNDIS() {
    LOGD("Usb RNDIS stop");
    return enableRNDIS(false);
}


int UsbController::enableRNDIS(bool enable) {
	    char value[20];
	    int fd = open("/sys/module/g_android/parameters/product_id", O_RDWR);
	    int count = snprintf(value, sizeof(value), "%s\n", (enable ? "1364" : "1351"));
	    write(fd, value, count);
	    close(fd);
	    return 0;
	}

/*
int UsbController::enableRNDIS(bool enable) {
    char value[20];

    int fd = open("/sys/module/g_android/parameters/product_id", O_RDWR);

    // * Switch to RNDIS composition (Product id = 1364) When RNDIS is enabled.
    // * Switch back to default composition (Product id = 1351 for ADB and 1353 for UMS) after RNDIS
    // * is disabled.
    // *
    char disabled_value[6];
    char adb[1];
    property_get("persist.service.adb.enable", adb, "0");
    if (adb[0]=='1')
        strncpy(disabled_value,"1354\n",5);
    else
        strncpy(disabled_value,"1353\n",5);
    disabled_value[5] = '\0';
    char enable_value[] = "1364\n";
    int count = snprintf(value, sizeof(value), "%s", (enable ? enable_value : disabled_value));
    write(fd, value, count);
    close(fd);
    return 0;
}
*/
bool UsbController::isRNDISStarted() {
    char value[5];
    int fd = open("/sys/module/g_android/parameters/product_id", O_RDONLY);
    read(fd, &value, 5);
    close(fd);
    return (!strncmp(value,"1364",4) ? true : false);
}