UsbController.cpp

/*
 * Copyright (C) 2008 The Android Open Source 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 "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];
#ifdef USE_HTC_USB_FUNCTION_SWITCH
    int fd = open("/sys/devices/platform/msm_hsusb/usb_function_switch", O_RDWR);
    int count = snprintf(value, sizeof(value), "%d\n", (enable ? 4 : 3));
#else
    int fd = open("/sys/class/usb_composite/rndis/enable", O_RDWR);
    int count = snprintf(value, sizeof(value), "%d\n", (enable ? 1 : 0));
#endif
    write(fd, value, count);
    close(fd);
    return 0;
}

bool UsbController::isRNDISStarted() {
    char value=0;
#ifdef USE_HTC_USB_FUNCTION_SWITCH
    int fd = open("/sys/devices/platform/msm_hsusb/usb_function_switch", O_RDWR);
#else
    int fd = open("/sys/class/usb_composite/rndis/enable", O_RDWR);
#endif
    read(fd, &value, 1);
    close(fd);
#ifdef USE_HTC_USB_FUNCTION_SWITCH
    return (value == '4' ? true : false);
#else
    return (value == '1' ? true : false);
#endif
}