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/*
This file is part of Android File Transfer For Linux.
Copyright (C) 2015-2020 Vladimir Menshakov
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <usb/DeviceDescriptor.h>
#include <usb/Directory.h>
#include <mtp/log.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
namespace mtp { namespace usb
{
DeviceDescriptor::DeviceDescriptor(int busId, const std::string &path): _busId(busId), _path(path)
{
debug("creating device descriptor at ", path);
_vendor = Directory::ReadInt(path + "/idVendor");
_product = Directory::ReadInt(path + "/idProduct");
_deviceNumber = Directory::ReadInt(path + "/devnum", 10);
_controlEp = std::make_shared<Endpoint>(path + "/ep_00");
_descriptor = Directory::ReadAll(path + "/descriptors");
_configurationValue = Directory::ReadInt(path + "/bConfigurationValue", 10);
}
DevicePtr DeviceDescriptor::Open(ContextPtr context)
{
DevicePtr device = TryOpen(context);
if (!device)
throw std::runtime_error("cannot open device at " + _path);
return device;
}
DevicePtr DeviceDescriptor::TryOpen(ContextPtr context)
{
char fname[256];
snprintf(fname, sizeof(fname), "/dev/bus/usb/%03d/%03u", _busId, _deviceNumber);
int fd = open(fname, O_RDWR);
if (fd != -1)
return std::make_shared<Device>(fd, _controlEp, _configurationValue);
debug("error: ", posix::Exception::GetErrorMessage(errno));
return nullptr;
}
DeviceDescriptor::~DeviceDescriptor()
{ }
}}
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