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#include "usbdevice.h"
#include <libusb.h>
#include <QThread>
#include "debug.h"
#define RETRY_COUNT 25
#define RETRY_INTERVAL_MS 50
struct USBDevice::USBDevicePrivate {
libusb_device *libusbDevice = nullptr;
libusb_device_handle *libusbDeviceHandle = nullptr;
};
USBDevice::USBDevice(const USBDeviceInfo &info, QObject *parent):
QObject(parent),
m_p(new USBDevicePrivate)
{
m_p->libusbDevice = (libusb_device*)info.backendData().value<void*>();
}
USBDevice::~USBDevice()
{
// TODO: Find out how to close it safely
// close();
delete m_p;
}
bool USBDevice::open()
{
if(!m_p->libusbDeviceHandle) {
const auto err = libusb_open(m_p->libusbDevice, &(m_p->libusbDeviceHandle));
check_continue(!err, QString("Unable to open device: %1").arg(libusb_error_name(err)));
}
return m_p->libusbDeviceHandle;
}
void USBDevice::close()
{
if(!m_p->libusbDeviceHandle) {
return;
}
libusb_close(m_p->libusbDeviceHandle);
m_p->libusbDeviceHandle = nullptr;
}
bool USBDevice::claimInterface(int interfaceNum)
{
int retryCount = RETRY_COUNT, err;
do {
if(!(err = libusb_claim_interface(m_p->libusbDeviceHandle, interfaceNum))) { break; }
QThread::msleep(RETRY_INTERVAL_MS);
} while(--retryCount);
check_continue(!err, QString("Failed to claim interface: %1").arg(libusb_error_name(err)));
return !err;
}
bool USBDevice::releaseInterface(int interfaceNum)
{
const auto err = libusb_release_interface(m_p->libusbDeviceHandle, interfaceNum);
check_continue(!err, QString("Failed to release interface: %1").arg(libusb_error_name(err)));
return !err;
}
bool USBDevice::setInterfaceAltSetting(int interfaceNum, uint8_t alt)
{
int retryCount = RETRY_COUNT, err;
do {
if(!(err = libusb_set_interface_alt_setting(m_p->libusbDeviceHandle, interfaceNum, alt))) { break; }
QThread::msleep(RETRY_INTERVAL_MS);
} while(--retryCount);
check_continue(!err, QString("Failed to set alternate setting: %1").arg(libusb_error_name(err)));
return !err;
}
bool USBDevice::controlTransfer(uint8_t requestType, uint8_t request, uint16_t value, uint16_t index, const QByteArray &buf)
{
int retryCount = RETRY_COUNT, res;
do {
auto *data = buf.isEmpty() ? nullptr : (unsigned char*)(buf.data());
if((res = libusb_control_transfer(m_p->libusbDeviceHandle, requestType, request, value, index, data, buf.size(), m_timeout)) >= 0) { break; }
QThread::msleep(RETRY_INTERVAL_MS);
} while(--retryCount);
if(res < 0) {
error_msg(QString("Failed to perform control transfer: %1").arg(libusb_error_name(res)));
} else if(res != buf.size()) {
debug_msg("Requested and transferred data size differ");
} else {}
return res == buf.size();
}
QByteArray USBDevice::controlTransfer(uint8_t requestType, uint8_t request, uint16_t value, uint16_t index, uint16_t length)
{
QByteArray buf(length, 0);
int retryCount = RETRY_COUNT, res;
do {
if((res = libusb_control_transfer(m_p->libusbDeviceHandle, requestType, request, value, index, (unsigned char*)(buf.data()), length, m_timeout)) >= 0) { break; }
QThread::msleep(RETRY_INTERVAL_MS);
} while ((res < 0) && --retryCount);
if(res < 0) {
buf.clear();
error_msg(QString("Failed to perform control transfer: %1").arg(libusb_error_name(res)));
} else if(res != length) {
buf.resize(res);
debug_msg("Requested and transferred data size differ");
} else {}
return buf;
}
QByteArray USBDevice::extraInterfaceDescriptor(int interfaceNum, uint8_t type, int length)
{
QByteArray ret;
libusb_config_descriptor *cfg;
check_return_val(!libusb_get_config_descriptor(m_p->libusbDevice, 0, &cfg), "Failed to get configuration descriptor", ret);
const auto intf = cfg->interface[interfaceNum];
for(auto i = 0; i < intf.num_altsetting; ++i) {
const auto altintf = intf.altsetting[i];
if((altintf.extra_length == length) && (altintf.extra[1] == type)) {
ret.append((const char*)(altintf.extra), altintf.extra_length);
break;
}
}
libusb_free_config_descriptor(cfg);
return ret;
}
QByteArray USBDevice::stringInterfaceDescriptor(uint8_t alt)
{
libusb_config_descriptor *cfg;
check_return_val(!libusb_get_config_descriptor(m_p->libusbDevice, 0, &cfg), "Failed to get configuration descriptor", QByteArray());
const auto BUF_SIZE = 254;
QByteArray buf(BUF_SIZE, 0);
const auto intf = *(cfg->interface);
const auto res = libusb_get_string_descriptor_ascii(m_p->libusbDeviceHandle, intf.altsetting[alt].iInterface, (unsigned char*)buf.data(), BUF_SIZE);
if(res < 0) {
error_msg(QString("Failed to get string descriptor: %1").arg(libusb_error_name(res)));
buf.clear();
} else {
buf.resize(res);
}
libusb_free_config_descriptor(cfg);
return buf;
}
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