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#include "usbdevicedetector.h"
#include <libusb.h>
#include <QDebug>
#include <QTimer>
#include <QThread>
#include <QLoggingCategory>
Q_LOGGING_CATEGORY(LOG_DETECTOR, "USB")
static int libusbHotplugCallback(libusb_context *ctx, libusb_device *dev, libusb_hotplug_event event, void *user_data);
#if defined(LIBUSB_API_VERSION) && (LIBUSB_API_VERSION >= 0x01000107)
static void libusbLogCallback(libusb_context *ctx, libusb_log_level logLevel, const char *text);
#endif
USBDeviceDetector::USBDeviceDetector(QObject *parent):
QObject(parent),
m_timer(new QTimer(this))
{
connect(m_timer, &QTimer::timeout, this, &USBDeviceDetector::processEvents);
libusb_init(nullptr);
#if defined(LIBUSB_API_VERSION) && (LIBUSB_API_VERSION >= 0x01000107)
libusb_set_log_cb(nullptr, libusbLogCallback, LIBUSB_LOG_CB_GLOBAL);
#endif
}
USBDeviceDetector::~USBDeviceDetector()
{
libusb_exit(nullptr);
}
void USBDeviceDetector::setLogLevel(int logLevel)
{
#if defined(LIBUSB_API_VERSION) && (LIBUSB_API_VERSION >= 0x01000107)
if(logLevel> LIBUSB_LOG_LEVEL_DEBUG) {
qCDebug(LOG_DETECTOR) << "Invalid log level:" << logLevel;
return;
}
libusb_set_option(nullptr, LIBUSB_OPTION_LOG_LEVEL, logLevel);
#else
Q_UNUSED(logLevel)
qCDebug(LOG_DETECTOR) << "Setting log level is supported with libusb >= 1.0.23";
#endif
}
bool USBDeviceDetector::setWantedDevices(const QList<USBDeviceInfo> &wantedList)
{
if(!libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG)) {
qCDebug(LOG_DETECTOR) << "Failed to get device descriptor";
return false;
}
m_timer->stop();
for(const auto &info : wantedList) {
const auto events = libusb_hotplug_event(LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED | LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT);
const auto err = libusb_hotplug_register_callback(nullptr, events, LIBUSB_HOTPLUG_ENUMERATE, info.vendorID(),
info.productID(), LIBUSB_HOTPLUG_MATCH_ANY, libusbHotplugCallback, this, nullptr);
if(err) {
qCDebug(LOG_DETECTOR) << "Failed to register hotplug callback";
return false;
}
}
m_timer->start(100);
return true;
}
void USBDeviceDetector::registerDevice(const USBDeviceInfo &deviceInfo)
{
QTimer::singleShot(0, this, [=]() {
if(m_devices.contains(deviceInfo)) {
return;
}
m_devices.append(fillDeviceInfo(deviceInfo));
emit devicePluggedIn(m_devices.last());
});
}
void USBDeviceDetector::unregisterDevice(const USBDeviceInfo &deviceInfo)
{
if(!m_devices.contains(deviceInfo)) {
return;
}
m_devices.removeOne(deviceInfo);
emit deviceUnplugged(deviceInfo);
}
void USBDeviceDetector::processEvents()
{
struct timeval timeout = {0, 10000};
libusb_handle_events_timeout_completed(nullptr, &timeout, nullptr);
}
USBDeviceInfo USBDeviceDetector::fillDeviceInfo(const USBDeviceInfo &deviceInfo)
{
auto numRetries = 20;
auto *dev = (libusb_device*)deviceInfo.backendData().value<void*>();
USBDeviceInfo newinfo = deviceInfo;
do {
libusb_device_descriptor desc = {};
struct libusb_device_handle *handle = nullptr;
unsigned char buf[1024];
int status;
do {
status = libusb_get_device_descriptor(dev, &desc);
if(status != LIBUSB_SUCCESS) {
qCDebug(LOG_DETECTOR) << "Failed to get device descriptor:" << libusb_strerror((libusb_error)status);
break;
}
status = libusb_open(dev, &handle);
if(status != LIBUSB_SUCCESS) {
qCDebug(LOG_DETECTOR) << "Failed to open device:" << libusb_strerror((libusb_error)status);
break;
}
status = libusb_get_string_descriptor_ascii(handle, desc.iManufacturer, buf, sizeof(buf));
if(status < 0) {
qCDebug(LOG_DETECTOR) << "Failed to get manufacturer string descriptor:" << libusb_strerror((libusb_error)status);
break;
}
newinfo.setManufacturer(QString::fromLocal8Bit((const char*)buf));
status = libusb_get_string_descriptor_ascii(handle, desc.iProduct, buf, sizeof(buf));
if(status < 0) {
qCDebug(LOG_DETECTOR) << "Failed to get product string descriptor:" << libusb_strerror((libusb_error)status);
break;
}
newinfo.setProductDescription(QString::fromLocal8Bit((const char*)buf));
status = libusb_get_string_descriptor_ascii(handle, desc.iSerialNumber, buf, sizeof(buf));
if(status < 0) {
qCDebug(LOG_DETECTOR) << "Failed to get device serial number:" << libusb_strerror((libusb_error)status);
break;
}
newinfo.setSerialNumber(QString::fromLocal8Bit((const char*)buf));
} while(false);
if(handle) {
libusb_close(handle);
}
if(status >= 0) {
break;
}
QThread::msleep(20);
} while(--numRetries);
return newinfo;
}
static int libusbHotplugCallback(libusb_context *ctx, libusb_device *dev, libusb_hotplug_event event, void *user_data) {
Q_UNUSED(ctx)
auto numRetries = 20;
auto *detector = (USBDeviceDetector*)user_data;
libusb_device_descriptor desc = {};
int status;
do {
status = libusb_get_device_descriptor(dev, &desc);
if((status == LIBUSB_SUCCESS) && (desc.idVendor != 0) && (desc.idProduct != 0)) {
break;
}
QThread::msleep(20);
} while(--numRetries);
if(numRetries == 0) {
if(status != LIBUSB_SUCCESS) {
qCDebug(LOG_DETECTOR) << "Failed to get device descriptor:" << libusb_strerror((libusb_error)status);
} else {
qCDebug(LOG_DETECTOR) << "Device descriptor received, but is invalid";
}
return 0;
}
const auto info = USBDeviceInfo(desc.idVendor, desc.idProduct).withBackendData(QVariant::fromValue((void*)dev));
if(event == LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED) {
detector->registerDevice(info);
} else if(event == LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT) {
detector->unregisterDevice(info);
} else {
qCDebug(LOG_DETECTOR) << "Unhandled libusb event";
}
return 0;
}
#if defined(LIBUSB_API_VERSION) && (LIBUSB_API_VERSION >= 0x01000107)
static void libusbLogCallback(libusb_context *ctx, libusb_log_level logLevel, const char *text) {
Q_UNUSED(ctx)
static const QStringList logPrefix = {
QStringLiteral("NONE"),
QStringLiteral("ERR"),
QStringLiteral("WRN"),
QStringLiteral("INF"),
QStringLiteral("DBG"),
};
if(logLevel >= logPrefix.size()) {
qCDebug(LOG_DETECTOR) << "Invalid log level:" << logLevel;
return;
}
qCDebug(LOG_DETECTOR).noquote() << QStringLiteral("[%1]").arg(logPrefix[logLevel]) << QString::fromLatin1(text, strlen(text) - 1);
}
#endif
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