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/******************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Debug Bridge.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
******************************************************************************/
#include "libqdb/protocol/protocol.h"
#include "libqdb/scopeguard.h"
#include "libqdb/qdbconstants.h"
#include "usbcommon.h"
#include "usbconnection.h"
#include "usbdeviceenumerator.h"
#include <QtCore/qdebug.h>
#include <QtCore/qloggingcategory.h>
#include <libusb.h>
Q_DECLARE_LOGGING_CATEGORY(usbC);
UsbAddress getAddress(libusb_device *device)
{
return UsbAddress{
libusb_get_bus_number(device),
libusb_get_device_address(device)
};
}
bool isQdbInterface(const libusb_interface &interface)
{
const libusb_interface_descriptor *descriptor = &interface.altsetting[0];
return descriptor->bInterfaceClass == qdbUsbClassId && descriptor->bInterfaceSubClass == qdbUsbSubclassId;
}
std::pair<bool, UsbInterfaceInfo> findQdbInterface(libusb_device *device)
{
libusb_config_descriptor *config;
const int ret = libusb_get_active_config_descriptor(device, &config);
if (ret) {
const auto address = getAddress(device);
qCWarning(usbC) << "Could not get config descriptor for device at"
<< address.busNumber << ":" << address.deviceAddress
<< ":" << libusb_error_name(ret);
return std::make_pair(false, UsbInterfaceInfo{});
}
ScopeGuard configGuard = [&]() {
libusb_free_config_descriptor(config);
};
const auto last = config->interface + config->bNumInterfaces;
const auto qdbInterface = std::find_if(config->interface, last, isQdbInterface);
if (qdbInterface == last) {
return std::make_pair(false, UsbInterfaceInfo{});;
}
const int inEndpointIndex = 1;
const int outEndpointIndex = 0;
const libusb_interface_descriptor *interface = &qdbInterface->altsetting[0];
const auto interfaceNumber = interface->bInterfaceNumber;
const auto inAddress = interface->endpoint[inEndpointIndex].bEndpointAddress;
const auto outAddress = interface->endpoint[outEndpointIndex].bEndpointAddress;
const UsbInterfaceInfo info{interfaceNumber, inAddress, outAddress};
return std::make_pair(true, info);
}
QString getSerialNumber(libusb_device *device, libusb_device_handle *handle)
{
QString serial{"???"};
libusb_device_descriptor desc;
int ret = libusb_get_device_descriptor(device, &desc);
if (ret) {
qCCritical(usbC) << "Could not get device descriptor" << libusb_error_name(ret);
return serial;
}
auto serialIndex = desc.iSerialNumber;
const uint16_t englishUsLangId = 0x409;
const int bufferSize = 255; // USB string descriptor size field is a single byte
unsigned char buffer[bufferSize];
int length = libusb_get_string_descriptor(handle, serialIndex, englishUsLangId, buffer, bufferSize);
if (length <= 0) {
qCWarning(usbC) << "Could not get string descriptor of serial number:" << libusb_error_name(length);
return serial;
}
// length is the length in bytes and UTF-16 characters consist of two bytes
Q_ASSERT(length % 2 == 0);
serial = QString::fromUtf16(reinterpret_cast<unsigned short*>(buffer), length / 2);
// Strip non-ASCII characters
serial = QString::fromLatin1(serial.toLatin1());
serial.remove(QChar{'?'});
return serial;
}
bool lessByAddress(const UsbDevice &lhs, const UsbDevice &rhs)
{
return lhs.address < rhs.address;
}
std::pair<bool, UsbDevice> makeUsbDeviceIfQdbDevice(libusb_device *device)
{
const auto interfaceResult = findQdbInterface(device);
if (!interfaceResult.first) {
// No QDB interface found, not a QDB device
return std::make_pair(false, UsbDevice{});
}
libusb_device_handle *handle;
int ret = libusb_open(device, &handle);
if (ret) {
const auto address = getAddress(device);
qCWarning(usbC) << "Could not open USB device at" << address.busNumber
<< ":" << address.deviceAddress << "for checking serial number:"
<< libusb_error_name(ret);
return std::make_pair(false, UsbDevice{});
}
ScopeGuard deviceGuard = [=]() {
libusb_close(handle);
};
const auto address = getAddress(device);
const auto serial = getSerialNumber(device, handle);
const UsbDevice usbDevice{serial, address, LibUsbDevice{device}, interfaceResult.second};
return std::make_pair(true, usbDevice);
}
std::vector<UsbDevice> makeUsbDevices()
{
if (!libUsbContext()) {
qCCritical(usbC) << "Uninitialized libusb in UsbDeviceEnumerator";
return std::vector<UsbDevice>{};
}
libusb_device **devices;
ssize_t deviceCount = libusb_get_device_list(libUsbContext(), &devices);
ScopeGuard deviceListGuard = [devices]() {
libusb_free_device_list(devices, 1);
};
if (deviceCount < 0) {
qCCritical(usbC) << "Could not list USB devices:" << libusb_error_name(deviceCount);
return std::vector<UsbDevice>{};
}
std::vector<UsbDevice> qdbDevices;
for (int i = 0; i < deviceCount; ++i) {
libusb_device *device = devices[i];
const auto result = makeUsbDeviceIfQdbDevice(device);
if (result.first)
qdbDevices.push_back(result.second);
}
// Sort the vector by USB address to allow treatment as set
std::sort(qdbDevices.begin(), qdbDevices.end(), lessByAddress);
return qdbDevices;
}
UsbDeviceEnumerator::UsbDeviceEnumerator()
: m_pollTimer{},
m_qdbDevices{}
{
}
UsbDeviceEnumerator::~UsbDeviceEnumerator()
{
if (m_pollTimer.isActive())
m_pollTimer.stop();
}
std::vector<UsbDevice> UsbDeviceEnumerator::listUsbDevices()
{
pollQdbDevices();
return m_qdbDevices;
}
void UsbDeviceEnumerator::startMonitoring()
{
QObject::connect(&m_pollTimer, &QTimer::timeout, this, &UsbDeviceEnumerator::pollQdbDevices);
m_pollTimer.start(1000);
pollQdbDevices();
}
void UsbDeviceEnumerator::stopMonitoring()
{
m_pollTimer.stop();
}
void UsbDeviceEnumerator::pollQdbDevices()
{
auto devices = makeUsbDevices();
if (m_pollTimer.isActive()) {
std::vector<UsbDevice> insertedDevices;
std::set_difference(devices.begin(), devices.end(),
m_qdbDevices.begin(), m_qdbDevices.end(),
std::back_inserter(insertedDevices),
lessByAddress);
for (const auto &device : insertedDevices)
emit devicePluggedIn(device);
std::vector<UsbDevice> removedDevices;
std::set_difference(m_qdbDevices.begin(), m_qdbDevices.end(),
devices.begin(), devices.end(),
std::back_inserter(removedDevices),
lessByAddress);
for (const auto &device : removedDevices)
emit deviceUnplugged(device.address);
}
m_qdbDevices = devices;
}
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